2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static void ata_dev_reread_id(struct ata_port *ap, struct ata_device *dev);
65 static void ata_dev_init_params(struct ata_port *ap, struct ata_device *dev);
66 static void ata_set_mode(struct ata_port *ap);
67 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
68 static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift);
69 static int fgb(u32 bitmap);
70 static int ata_choose_xfer_mode(const struct ata_port *ap,
72 unsigned int *xfer_shift_out);
74 static unsigned int ata_unique_id = 1;
75 static struct workqueue_struct *ata_wq;
77 int atapi_enabled = 0;
78 module_param(atapi_enabled, int, 0444);
79 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
81 MODULE_AUTHOR("Jeff Garzik");
82 MODULE_DESCRIPTION("Library module for ATA devices");
83 MODULE_LICENSE("GPL");
84 MODULE_VERSION(DRV_VERSION);
87 * ata_tf_load_pio - send taskfile registers to host controller
88 * @ap: Port to which output is sent
89 * @tf: ATA taskfile register set
91 * Outputs ATA taskfile to standard ATA host controller.
94 * Inherited from caller.
97 static void ata_tf_load_pio(struct ata_port *ap, const struct ata_taskfile *tf)
99 struct ata_ioports *ioaddr = &ap->ioaddr;
100 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
102 if (tf->ctl != ap->last_ctl) {
103 outb(tf->ctl, ioaddr->ctl_addr);
104 ap->last_ctl = tf->ctl;
108 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
109 outb(tf->hob_feature, ioaddr->feature_addr);
110 outb(tf->hob_nsect, ioaddr->nsect_addr);
111 outb(tf->hob_lbal, ioaddr->lbal_addr);
112 outb(tf->hob_lbam, ioaddr->lbam_addr);
113 outb(tf->hob_lbah, ioaddr->lbah_addr);
114 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
123 outb(tf->feature, ioaddr->feature_addr);
124 outb(tf->nsect, ioaddr->nsect_addr);
125 outb(tf->lbal, ioaddr->lbal_addr);
126 outb(tf->lbam, ioaddr->lbam_addr);
127 outb(tf->lbah, ioaddr->lbah_addr);
128 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
136 if (tf->flags & ATA_TFLAG_DEVICE) {
137 outb(tf->device, ioaddr->device_addr);
138 VPRINTK("device 0x%X\n", tf->device);
145 * ata_tf_load_mmio - send taskfile registers to host controller
146 * @ap: Port to which output is sent
147 * @tf: ATA taskfile register set
149 * Outputs ATA taskfile to standard ATA host controller using MMIO.
152 * Inherited from caller.
155 static void ata_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
157 struct ata_ioports *ioaddr = &ap->ioaddr;
158 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
160 if (tf->ctl != ap->last_ctl) {
161 writeb(tf->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
162 ap->last_ctl = tf->ctl;
166 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
167 writeb(tf->hob_feature, (void __iomem *) ioaddr->feature_addr);
168 writeb(tf->hob_nsect, (void __iomem *) ioaddr->nsect_addr);
169 writeb(tf->hob_lbal, (void __iomem *) ioaddr->lbal_addr);
170 writeb(tf->hob_lbam, (void __iomem *) ioaddr->lbam_addr);
171 writeb(tf->hob_lbah, (void __iomem *) ioaddr->lbah_addr);
172 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
181 writeb(tf->feature, (void __iomem *) ioaddr->feature_addr);
182 writeb(tf->nsect, (void __iomem *) ioaddr->nsect_addr);
183 writeb(tf->lbal, (void __iomem *) ioaddr->lbal_addr);
184 writeb(tf->lbam, (void __iomem *) ioaddr->lbam_addr);
185 writeb(tf->lbah, (void __iomem *) ioaddr->lbah_addr);
186 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
194 if (tf->flags & ATA_TFLAG_DEVICE) {
195 writeb(tf->device, (void __iomem *) ioaddr->device_addr);
196 VPRINTK("device 0x%X\n", tf->device);
204 * ata_tf_load - send taskfile registers to host controller
205 * @ap: Port to which output is sent
206 * @tf: ATA taskfile register set
208 * Outputs ATA taskfile to standard ATA host controller using MMIO
209 * or PIO as indicated by the ATA_FLAG_MMIO flag.
210 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
211 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
212 * hob_lbal, hob_lbam, and hob_lbah.
214 * This function waits for idle (!BUSY and !DRQ) after writing
215 * registers. If the control register has a new value, this
216 * function also waits for idle after writing control and before
217 * writing the remaining registers.
219 * May be used as the tf_load() entry in ata_port_operations.
222 * Inherited from caller.
224 void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
226 if (ap->flags & ATA_FLAG_MMIO)
227 ata_tf_load_mmio(ap, tf);
229 ata_tf_load_pio(ap, tf);
233 * ata_exec_command_pio - issue ATA command to host controller
234 * @ap: port to which command is being issued
235 * @tf: ATA taskfile register set
237 * Issues PIO write to ATA command register, with proper
238 * synchronization with interrupt handler / other threads.
241 * spin_lock_irqsave(host_set lock)
244 static void ata_exec_command_pio(struct ata_port *ap, const struct ata_taskfile *tf)
246 DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
248 outb(tf->command, ap->ioaddr.command_addr);
254 * ata_exec_command_mmio - issue ATA command to host controller
255 * @ap: port to which command is being issued
256 * @tf: ATA taskfile register set
258 * Issues MMIO write to ATA command register, with proper
259 * synchronization with interrupt handler / other threads.
262 * spin_lock_irqsave(host_set lock)
265 static void ata_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
267 DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
269 writeb(tf->command, (void __iomem *) ap->ioaddr.command_addr);
275 * ata_exec_command - issue ATA command to host controller
276 * @ap: port to which command is being issued
277 * @tf: ATA taskfile register set
279 * Issues PIO/MMIO write to ATA command register, with proper
280 * synchronization with interrupt handler / other threads.
283 * spin_lock_irqsave(host_set lock)
285 void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf)
287 if (ap->flags & ATA_FLAG_MMIO)
288 ata_exec_command_mmio(ap, tf);
290 ata_exec_command_pio(ap, tf);
294 * ata_tf_to_host - issue ATA taskfile to host controller
295 * @ap: port to which command is being issued
296 * @tf: ATA taskfile register set
298 * Issues ATA taskfile register set to ATA host controller,
299 * with proper synchronization with interrupt handler and
303 * spin_lock_irqsave(host_set lock)
306 static inline void ata_tf_to_host(struct ata_port *ap,
307 const struct ata_taskfile *tf)
309 ap->ops->tf_load(ap, tf);
310 ap->ops->exec_command(ap, tf);
314 * ata_tf_read_pio - input device's ATA taskfile shadow registers
315 * @ap: Port from which input is read
316 * @tf: ATA taskfile register set for storing input
318 * Reads ATA taskfile registers for currently-selected device
322 * Inherited from caller.
325 static void ata_tf_read_pio(struct ata_port *ap, struct ata_taskfile *tf)
327 struct ata_ioports *ioaddr = &ap->ioaddr;
329 tf->command = ata_check_status(ap);
330 tf->feature = inb(ioaddr->error_addr);
331 tf->nsect = inb(ioaddr->nsect_addr);
332 tf->lbal = inb(ioaddr->lbal_addr);
333 tf->lbam = inb(ioaddr->lbam_addr);
334 tf->lbah = inb(ioaddr->lbah_addr);
335 tf->device = inb(ioaddr->device_addr);
337 if (tf->flags & ATA_TFLAG_LBA48) {
338 outb(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
339 tf->hob_feature = inb(ioaddr->error_addr);
340 tf->hob_nsect = inb(ioaddr->nsect_addr);
341 tf->hob_lbal = inb(ioaddr->lbal_addr);
342 tf->hob_lbam = inb(ioaddr->lbam_addr);
343 tf->hob_lbah = inb(ioaddr->lbah_addr);
348 * ata_tf_read_mmio - input device's ATA taskfile shadow registers
349 * @ap: Port from which input is read
350 * @tf: ATA taskfile register set for storing input
352 * Reads ATA taskfile registers for currently-selected device
356 * Inherited from caller.
359 static void ata_tf_read_mmio(struct ata_port *ap, struct ata_taskfile *tf)
361 struct ata_ioports *ioaddr = &ap->ioaddr;
363 tf->command = ata_check_status(ap);
364 tf->feature = readb((void __iomem *)ioaddr->error_addr);
365 tf->nsect = readb((void __iomem *)ioaddr->nsect_addr);
366 tf->lbal = readb((void __iomem *)ioaddr->lbal_addr);
367 tf->lbam = readb((void __iomem *)ioaddr->lbam_addr);
368 tf->lbah = readb((void __iomem *)ioaddr->lbah_addr);
369 tf->device = readb((void __iomem *)ioaddr->device_addr);
371 if (tf->flags & ATA_TFLAG_LBA48) {
372 writeb(tf->ctl | ATA_HOB, (void __iomem *) ap->ioaddr.ctl_addr);
373 tf->hob_feature = readb((void __iomem *)ioaddr->error_addr);
374 tf->hob_nsect = readb((void __iomem *)ioaddr->nsect_addr);
375 tf->hob_lbal = readb((void __iomem *)ioaddr->lbal_addr);
376 tf->hob_lbam = readb((void __iomem *)ioaddr->lbam_addr);
377 tf->hob_lbah = readb((void __iomem *)ioaddr->lbah_addr);
383 * ata_tf_read - input device's ATA taskfile shadow registers
384 * @ap: Port from which input is read
385 * @tf: ATA taskfile register set for storing input
387 * Reads ATA taskfile registers for currently-selected device
390 * Reads nsect, lbal, lbam, lbah, and device. If ATA_TFLAG_LBA48
391 * is set, also reads the hob registers.
393 * May be used as the tf_read() entry in ata_port_operations.
396 * Inherited from caller.
398 void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
400 if (ap->flags & ATA_FLAG_MMIO)
401 ata_tf_read_mmio(ap, tf);
403 ata_tf_read_pio(ap, tf);
407 * ata_check_status_pio - Read device status reg & clear interrupt
408 * @ap: port where the device is
410 * Reads ATA taskfile status register for currently-selected device
411 * and return its value. This also clears pending interrupts
415 * Inherited from caller.
417 static u8 ata_check_status_pio(struct ata_port *ap)
419 return inb(ap->ioaddr.status_addr);
423 * ata_check_status_mmio - Read device status reg & clear interrupt
424 * @ap: port where the device is
426 * Reads ATA taskfile status register for currently-selected device
427 * via MMIO and return its value. This also clears pending interrupts
431 * Inherited from caller.
433 static u8 ata_check_status_mmio(struct ata_port *ap)
435 return readb((void __iomem *) ap->ioaddr.status_addr);
440 * ata_check_status - Read device status reg & clear interrupt
441 * @ap: port where the device is
443 * Reads ATA taskfile status register for currently-selected device
444 * and return its value. This also clears pending interrupts
447 * May be used as the check_status() entry in ata_port_operations.
450 * Inherited from caller.
452 u8 ata_check_status(struct ata_port *ap)
454 if (ap->flags & ATA_FLAG_MMIO)
455 return ata_check_status_mmio(ap);
456 return ata_check_status_pio(ap);
461 * ata_altstatus - Read device alternate status reg
462 * @ap: port where the device is
464 * Reads ATA taskfile alternate status register for
465 * currently-selected device and return its value.
467 * Note: may NOT be used as the check_altstatus() entry in
468 * ata_port_operations.
471 * Inherited from caller.
473 u8 ata_altstatus(struct ata_port *ap)
475 if (ap->ops->check_altstatus)
476 return ap->ops->check_altstatus(ap);
478 if (ap->flags & ATA_FLAG_MMIO)
479 return readb((void __iomem *)ap->ioaddr.altstatus_addr);
480 return inb(ap->ioaddr.altstatus_addr);
485 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
486 * @tf: Taskfile to convert
487 * @fis: Buffer into which data will output
488 * @pmp: Port multiplier port
490 * Converts a standard ATA taskfile to a Serial ATA
491 * FIS structure (Register - Host to Device).
494 * Inherited from caller.
497 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
499 fis[0] = 0x27; /* Register - Host to Device FIS */
500 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
501 bit 7 indicates Command FIS */
502 fis[2] = tf->command;
503 fis[3] = tf->feature;
510 fis[8] = tf->hob_lbal;
511 fis[9] = tf->hob_lbam;
512 fis[10] = tf->hob_lbah;
513 fis[11] = tf->hob_feature;
516 fis[13] = tf->hob_nsect;
527 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
528 * @fis: Buffer from which data will be input
529 * @tf: Taskfile to output
531 * Converts a serial ATA FIS structure to a standard ATA taskfile.
534 * Inherited from caller.
537 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
539 tf->command = fis[2]; /* status */
540 tf->feature = fis[3]; /* error */
547 tf->hob_lbal = fis[8];
548 tf->hob_lbam = fis[9];
549 tf->hob_lbah = fis[10];
552 tf->hob_nsect = fis[13];
555 static const u8 ata_rw_cmds[] = {
559 ATA_CMD_READ_MULTI_EXT,
560 ATA_CMD_WRITE_MULTI_EXT,
564 ATA_CMD_WRITE_MULTI_FUA_EXT,
568 ATA_CMD_PIO_READ_EXT,
569 ATA_CMD_PIO_WRITE_EXT,
582 ATA_CMD_WRITE_FUA_EXT
586 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
587 * @qc: command to examine and configure
589 * Examine the device configuration and tf->flags to calculate
590 * the proper read/write commands and protocol to use.
595 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
597 struct ata_taskfile *tf = &qc->tf;
598 struct ata_device *dev = qc->dev;
601 int index, fua, lba48, write;
603 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
604 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
605 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
607 if (dev->flags & ATA_DFLAG_PIO) {
608 tf->protocol = ATA_PROT_PIO;
609 index = dev->multi_count ? 0 : 8;
610 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
611 /* Unable to use DMA due to host limitation */
612 tf->protocol = ATA_PROT_PIO;
613 index = dev->multi_count ? 0 : 4;
615 tf->protocol = ATA_PROT_DMA;
619 cmd = ata_rw_cmds[index + fua + lba48 + write];
627 static const char * const xfer_mode_str[] = {
647 * ata_udma_string - convert UDMA bit offset to string
648 * @mask: mask of bits supported; only highest bit counts.
650 * Determine string which represents the highest speed
651 * (highest bit in @udma_mask).
657 * Constant C string representing highest speed listed in
658 * @udma_mask, or the constant C string "<n/a>".
661 static const char *ata_mode_string(unsigned int mask)
665 for (i = 7; i >= 0; i--)
668 for (i = ATA_SHIFT_MWDMA + 2; i >= ATA_SHIFT_MWDMA; i--)
671 for (i = ATA_SHIFT_PIO + 4; i >= ATA_SHIFT_PIO; i--)
678 return xfer_mode_str[i];
682 * ata_pio_devchk - PATA device presence detection
683 * @ap: ATA channel to examine
684 * @device: Device to examine (starting at zero)
686 * This technique was originally described in
687 * Hale Landis's ATADRVR (www.ata-atapi.com), and
688 * later found its way into the ATA/ATAPI spec.
690 * Write a pattern to the ATA shadow registers,
691 * and if a device is present, it will respond by
692 * correctly storing and echoing back the
693 * ATA shadow register contents.
699 static unsigned int ata_pio_devchk(struct ata_port *ap,
702 struct ata_ioports *ioaddr = &ap->ioaddr;
705 ap->ops->dev_select(ap, device);
707 outb(0x55, ioaddr->nsect_addr);
708 outb(0xaa, ioaddr->lbal_addr);
710 outb(0xaa, ioaddr->nsect_addr);
711 outb(0x55, ioaddr->lbal_addr);
713 outb(0x55, ioaddr->nsect_addr);
714 outb(0xaa, ioaddr->lbal_addr);
716 nsect = inb(ioaddr->nsect_addr);
717 lbal = inb(ioaddr->lbal_addr);
719 if ((nsect == 0x55) && (lbal == 0xaa))
720 return 1; /* we found a device */
722 return 0; /* nothing found */
726 * ata_mmio_devchk - PATA device presence detection
727 * @ap: ATA channel to examine
728 * @device: Device to examine (starting at zero)
730 * This technique was originally described in
731 * Hale Landis's ATADRVR (www.ata-atapi.com), and
732 * later found its way into the ATA/ATAPI spec.
734 * Write a pattern to the ATA shadow registers,
735 * and if a device is present, it will respond by
736 * correctly storing and echoing back the
737 * ATA shadow register contents.
743 static unsigned int ata_mmio_devchk(struct ata_port *ap,
746 struct ata_ioports *ioaddr = &ap->ioaddr;
749 ap->ops->dev_select(ap, device);
751 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
752 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
754 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
755 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
757 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
758 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
760 nsect = readb((void __iomem *) ioaddr->nsect_addr);
761 lbal = readb((void __iomem *) ioaddr->lbal_addr);
763 if ((nsect == 0x55) && (lbal == 0xaa))
764 return 1; /* we found a device */
766 return 0; /* nothing found */
770 * ata_devchk - PATA device presence detection
771 * @ap: ATA channel to examine
772 * @device: Device to examine (starting at zero)
774 * Dispatch ATA device presence detection, depending
775 * on whether we are using PIO or MMIO to talk to the
776 * ATA shadow registers.
782 static unsigned int ata_devchk(struct ata_port *ap,
785 if (ap->flags & ATA_FLAG_MMIO)
786 return ata_mmio_devchk(ap, device);
787 return ata_pio_devchk(ap, device);
791 * ata_dev_classify - determine device type based on ATA-spec signature
792 * @tf: ATA taskfile register set for device to be identified
794 * Determine from taskfile register contents whether a device is
795 * ATA or ATAPI, as per "Signature and persistence" section
796 * of ATA/PI spec (volume 1, sect 5.14).
802 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
803 * the event of failure.
806 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
808 /* Apple's open source Darwin code hints that some devices only
809 * put a proper signature into the LBA mid/high registers,
810 * So, we only check those. It's sufficient for uniqueness.
813 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
814 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
815 DPRINTK("found ATA device by sig\n");
819 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
820 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
821 DPRINTK("found ATAPI device by sig\n");
822 return ATA_DEV_ATAPI;
825 DPRINTK("unknown device\n");
826 return ATA_DEV_UNKNOWN;
830 * ata_dev_try_classify - Parse returned ATA device signature
831 * @ap: ATA channel to examine
832 * @device: Device to examine (starting at zero)
833 * @r_err: Value of error register on completion
835 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
836 * an ATA/ATAPI-defined set of values is placed in the ATA
837 * shadow registers, indicating the results of device detection
840 * Select the ATA device, and read the values from the ATA shadow
841 * registers. Then parse according to the Error register value,
842 * and the spec-defined values examined by ata_dev_classify().
848 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
852 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
854 struct ata_taskfile tf;
858 ap->ops->dev_select(ap, device);
860 memset(&tf, 0, sizeof(tf));
862 ap->ops->tf_read(ap, &tf);
867 /* see if device passed diags */
870 else if ((device == 0) && (err == 0x81))
875 /* determine if device is ATA or ATAPI */
876 class = ata_dev_classify(&tf);
878 if (class == ATA_DEV_UNKNOWN)
880 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
886 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
887 * @id: IDENTIFY DEVICE results we will examine
888 * @s: string into which data is output
889 * @ofs: offset into identify device page
890 * @len: length of string to return. must be an even number.
892 * The strings in the IDENTIFY DEVICE page are broken up into
893 * 16-bit chunks. Run through the string, and output each
894 * 8-bit chunk linearly, regardless of platform.
900 void ata_dev_id_string(const u16 *id, unsigned char *s,
901 unsigned int ofs, unsigned int len)
921 * ata_noop_dev_select - Select device 0/1 on ATA bus
922 * @ap: ATA channel to manipulate
923 * @device: ATA device (numbered from zero) to select
925 * This function performs no actual function.
927 * May be used as the dev_select() entry in ata_port_operations.
932 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
938 * ata_std_dev_select - Select device 0/1 on ATA bus
939 * @ap: ATA channel to manipulate
940 * @device: ATA device (numbered from zero) to select
942 * Use the method defined in the ATA specification to
943 * make either device 0, or device 1, active on the
944 * ATA channel. Works with both PIO and MMIO.
946 * May be used as the dev_select() entry in ata_port_operations.
952 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
957 tmp = ATA_DEVICE_OBS;
959 tmp = ATA_DEVICE_OBS | ATA_DEV1;
961 if (ap->flags & ATA_FLAG_MMIO) {
962 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
964 outb(tmp, ap->ioaddr.device_addr);
966 ata_pause(ap); /* needed; also flushes, for mmio */
970 * ata_dev_select - Select device 0/1 on ATA bus
971 * @ap: ATA channel to manipulate
972 * @device: ATA device (numbered from zero) to select
973 * @wait: non-zero to wait for Status register BSY bit to clear
974 * @can_sleep: non-zero if context allows sleeping
976 * Use the method defined in the ATA specification to
977 * make either device 0, or device 1, active on the
980 * This is a high-level version of ata_std_dev_select(),
981 * which additionally provides the services of inserting
982 * the proper pauses and status polling, where needed.
988 void ata_dev_select(struct ata_port *ap, unsigned int device,
989 unsigned int wait, unsigned int can_sleep)
991 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
992 ap->id, device, wait);
997 ap->ops->dev_select(ap, device);
1000 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
1007 * ata_dump_id - IDENTIFY DEVICE info debugging output
1008 * @dev: Device whose IDENTIFY DEVICE page we will dump
1010 * Dump selected 16-bit words from a detected device's
1011 * IDENTIFY PAGE page.
1017 static inline void ata_dump_id(const struct ata_device *dev)
1019 DPRINTK("49==0x%04x "
1029 DPRINTK("80==0x%04x "
1039 DPRINTK("88==0x%04x "
1046 * Compute the PIO modes available for this device. This is not as
1047 * trivial as it seems if we must consider early devices correctly.
1049 * FIXME: pre IDE drive timing (do we care ?).
1052 static unsigned int ata_pio_modes(const struct ata_device *adev)
1056 /* Usual case. Word 53 indicates word 64 is valid */
1057 if (adev->id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1058 modes = adev->id[ATA_ID_PIO_MODES] & 0x03;
1064 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
1065 number for the maximum. Turn it into a mask and return it */
1066 modes = (2 << ((adev->id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF)) - 1 ;
1068 /* But wait.. there's more. Design your standards by committee and
1069 you too can get a free iordy field to process. However its the
1070 speeds not the modes that are supported... Note drivers using the
1071 timing API will get this right anyway */
1075 ata_queue_packet_task(struct ata_port *ap)
1077 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
1078 queue_work(ata_wq, &ap->packet_task);
1082 ata_queue_pio_task(struct ata_port *ap)
1084 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
1085 queue_work(ata_wq, &ap->pio_task);
1089 ata_queue_delayed_pio_task(struct ata_port *ap, unsigned long delay)
1091 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
1092 queue_delayed_work(ata_wq, &ap->pio_task, delay);
1096 * ata_flush_pio_tasks - Flush pio_task and packet_task
1097 * @ap: the target ata_port
1099 * After this function completes, pio_task and packet_task are
1100 * guranteed not to be running or scheduled.
1103 * Kernel thread context (may sleep)
1106 static void ata_flush_pio_tasks(struct ata_port *ap)
1109 unsigned long flags;
1113 spin_lock_irqsave(&ap->host_set->lock, flags);
1114 ap->flags |= ATA_FLAG_FLUSH_PIO_TASK;
1115 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1117 DPRINTK("flush #1\n");
1118 flush_workqueue(ata_wq);
1121 * At this point, if a task is running, it's guaranteed to see
1122 * the FLUSH flag; thus, it will never queue pio tasks again.
1125 tmp |= cancel_delayed_work(&ap->pio_task);
1126 tmp |= cancel_delayed_work(&ap->packet_task);
1128 DPRINTK("flush #2\n");
1129 flush_workqueue(ata_wq);
1132 spin_lock_irqsave(&ap->host_set->lock, flags);
1133 ap->flags &= ~ATA_FLAG_FLUSH_PIO_TASK;
1134 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1139 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1141 struct completion *waiting = qc->private_data;
1143 qc->ap->ops->tf_read(qc->ap, &qc->tf);
1148 * ata_exec_internal - execute libata internal command
1149 * @ap: Port to which the command is sent
1150 * @dev: Device to which the command is sent
1151 * @tf: Taskfile registers for the command and the result
1152 * @dma_dir: Data tranfer direction of the command
1153 * @buf: Data buffer of the command
1154 * @buflen: Length of data buffer
1156 * Executes libata internal command with timeout. @tf contains
1157 * command on entry and result on return. Timeout and error
1158 * conditions are reported via return value. No recovery action
1159 * is taken after a command times out. It's caller's duty to
1160 * clean up after timeout.
1163 * None. Should be called with kernel context, might sleep.
1167 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
1168 struct ata_taskfile *tf,
1169 int dma_dir, void *buf, unsigned int buflen)
1171 u8 command = tf->command;
1172 struct ata_queued_cmd *qc;
1173 DECLARE_COMPLETION(wait);
1174 unsigned long flags;
1175 unsigned int err_mask;
1177 spin_lock_irqsave(&ap->host_set->lock, flags);
1179 qc = ata_qc_new_init(ap, dev);
1183 qc->dma_dir = dma_dir;
1184 if (dma_dir != DMA_NONE) {
1185 ata_sg_init_one(qc, buf, buflen);
1186 qc->nsect = buflen / ATA_SECT_SIZE;
1189 qc->private_data = &wait;
1190 qc->complete_fn = ata_qc_complete_internal;
1192 qc->err_mask = ata_qc_issue(qc);
1194 ata_qc_complete(qc);
1196 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1198 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
1199 spin_lock_irqsave(&ap->host_set->lock, flags);
1201 /* We're racing with irq here. If we lose, the
1202 * following test prevents us from completing the qc
1203 * again. If completion irq occurs after here but
1204 * before the caller cleans up, it will result in a
1205 * spurious interrupt. We can live with that.
1207 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1208 qc->err_mask = AC_ERR_TIMEOUT;
1209 ata_qc_complete(qc);
1210 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
1214 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1218 err_mask = qc->err_mask;
1226 * ata_pio_need_iordy - check if iordy needed
1229 * Check if the current speed of the device requires IORDY. Used
1230 * by various controllers for chip configuration.
1233 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1236 int speed = adev->pio_mode - XFER_PIO_0;
1243 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1245 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1246 pio = adev->id[ATA_ID_EIDE_PIO];
1247 /* Is the speed faster than the drive allows non IORDY ? */
1249 /* This is cycle times not frequency - watch the logic! */
1250 if (pio > 240) /* PIO2 is 240nS per cycle */
1259 * ata_dev_identify - obtain IDENTIFY x DEVICE page
1260 * @ap: port on which device we wish to probe resides
1261 * @device: device bus address, starting at zero
1263 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
1264 * command, and read back the 512-byte device information page.
1265 * The device information page is fed to us via the standard
1266 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
1267 * using standard PIO-IN paths)
1269 * After reading the device information page, we use several
1270 * bits of information from it to initialize data structures
1271 * that will be used during the lifetime of the ata_device.
1272 * Other data from the info page is used to disqualify certain
1273 * older ATA devices we do not wish to support.
1276 * Inherited from caller. Some functions called by this function
1277 * obtain the host_set lock.
1280 static void ata_dev_identify(struct ata_port *ap, unsigned int device)
1282 struct ata_device *dev = &ap->device[device];
1283 unsigned int major_version;
1285 unsigned long xfer_modes;
1286 unsigned int using_edd;
1287 struct ata_taskfile tf;
1288 unsigned int err_mask;
1291 if (!ata_dev_present(dev)) {
1292 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1297 if (ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
1302 DPRINTK("ENTER, host %u, dev %u\n", ap->id, device);
1304 assert (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ATAPI ||
1305 dev->class == ATA_DEV_NONE);
1307 ata_dev_select(ap, device, 1, 1); /* select device 0/1 */
1310 ata_tf_init(ap, &tf, device);
1312 if (dev->class == ATA_DEV_ATA) {
1313 tf.command = ATA_CMD_ID_ATA;
1314 DPRINTK("do ATA identify\n");
1316 tf.command = ATA_CMD_ID_ATAPI;
1317 DPRINTK("do ATAPI identify\n");
1320 tf.protocol = ATA_PROT_PIO;
1322 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
1323 dev->id, sizeof(dev->id));
1326 if (err_mask & ~AC_ERR_DEV)
1330 * arg! EDD works for all test cases, but seems to return
1331 * the ATA signature for some ATAPI devices. Until the
1332 * reason for this is found and fixed, we fix up the mess
1333 * here. If IDENTIFY DEVICE returns command aborted
1334 * (as ATAPI devices do), then we issue an
1335 * IDENTIFY PACKET DEVICE.
1337 * ATA software reset (SRST, the default) does not appear
1338 * to have this problem.
1340 if ((using_edd) && (dev->class == ATA_DEV_ATA)) {
1341 u8 err = tf.feature;
1342 if (err & ATA_ABORTED) {
1343 dev->class = ATA_DEV_ATAPI;
1350 swap_buf_le16(dev->id, ATA_ID_WORDS);
1352 /* print device capabilities */
1353 printk(KERN_DEBUG "ata%u: dev %u cfg "
1354 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1355 ap->id, device, dev->id[49],
1356 dev->id[82], dev->id[83], dev->id[84],
1357 dev->id[85], dev->id[86], dev->id[87],
1361 * common ATA, ATAPI feature tests
1364 /* we require DMA support (bits 8 of word 49) */
1365 if (!ata_id_has_dma(dev->id)) {
1366 printk(KERN_DEBUG "ata%u: no dma\n", ap->id);
1370 /* quick-n-dirty find max transfer mode; for printk only */
1371 xfer_modes = dev->id[ATA_ID_UDMA_MODES];
1373 xfer_modes = (dev->id[ATA_ID_MWDMA_MODES]) << ATA_SHIFT_MWDMA;
1375 xfer_modes = ata_pio_modes(dev);
1379 /* ATA-specific feature tests */
1380 if (dev->class == ATA_DEV_ATA) {
1381 if (!ata_id_is_ata(dev->id)) /* sanity check */
1384 /* get major version */
1385 tmp = dev->id[ATA_ID_MAJOR_VER];
1386 for (major_version = 14; major_version >= 1; major_version--)
1387 if (tmp & (1 << major_version))
1391 * The exact sequence expected by certain pre-ATA4 drives is:
1394 * INITIALIZE DEVICE PARAMETERS
1396 * Some drives were very specific about that exact sequence.
1398 if (major_version < 4 || (!ata_id_has_lba(dev->id))) {
1399 ata_dev_init_params(ap, dev);
1401 /* current CHS translation info (id[53-58]) might be
1402 * changed. reread the identify device info.
1404 ata_dev_reread_id(ap, dev);
1407 if (ata_id_has_lba(dev->id)) {
1408 dev->flags |= ATA_DFLAG_LBA;
1410 if (ata_id_has_lba48(dev->id)) {
1411 dev->flags |= ATA_DFLAG_LBA48;
1412 dev->n_sectors = ata_id_u64(dev->id, 100);
1414 dev->n_sectors = ata_id_u32(dev->id, 60);
1417 /* print device info to dmesg */
1418 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1421 ata_mode_string(xfer_modes),
1422 (unsigned long long)dev->n_sectors,
1423 dev->flags & ATA_DFLAG_LBA48 ? " LBA48" : " LBA");
1427 /* Default translation */
1428 dev->cylinders = dev->id[1];
1429 dev->heads = dev->id[3];
1430 dev->sectors = dev->id[6];
1431 dev->n_sectors = dev->cylinders * dev->heads * dev->sectors;
1433 if (ata_id_current_chs_valid(dev->id)) {
1434 /* Current CHS translation is valid. */
1435 dev->cylinders = dev->id[54];
1436 dev->heads = dev->id[55];
1437 dev->sectors = dev->id[56];
1439 dev->n_sectors = ata_id_u32(dev->id, 57);
1442 /* print device info to dmesg */
1443 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1446 ata_mode_string(xfer_modes),
1447 (unsigned long long)dev->n_sectors,
1448 (int)dev->cylinders, (int)dev->heads, (int)dev->sectors);
1452 ap->host->max_cmd_len = 16;
1455 /* ATAPI-specific feature tests */
1456 else if (dev->class == ATA_DEV_ATAPI) {
1457 if (ata_id_is_ata(dev->id)) /* sanity check */
1460 rc = atapi_cdb_len(dev->id);
1461 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1462 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1465 ap->cdb_len = (unsigned int) rc;
1466 ap->host->max_cmd_len = (unsigned char) ap->cdb_len;
1468 /* print device info to dmesg */
1469 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1471 ata_mode_string(xfer_modes));
1474 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1478 printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
1481 dev->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1482 DPRINTK("EXIT, err\n");
1486 static inline u8 ata_dev_knobble(const struct ata_port *ap)
1488 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(ap->device->id)));
1492 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1499 void ata_dev_config(struct ata_port *ap, unsigned int i)
1501 /* limit bridge transfers to udma5, 200 sectors */
1502 if (ata_dev_knobble(ap)) {
1503 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1504 ap->id, ap->device->devno);
1505 ap->udma_mask &= ATA_UDMA5;
1506 ap->host->max_sectors = ATA_MAX_SECTORS;
1507 ap->host->hostt->max_sectors = ATA_MAX_SECTORS;
1508 ap->device[i].flags |= ATA_DFLAG_LOCK_SECTORS;
1511 if (ap->ops->dev_config)
1512 ap->ops->dev_config(ap, &ap->device[i]);
1516 * ata_bus_probe - Reset and probe ATA bus
1519 * Master ATA bus probing function. Initiates a hardware-dependent
1520 * bus reset, then attempts to identify any devices found on
1524 * PCI/etc. bus probe sem.
1527 * Zero on success, non-zero on error.
1530 static int ata_bus_probe(struct ata_port *ap)
1532 unsigned int i, found = 0;
1534 if (ap->ops->probe_reset) {
1535 unsigned int classes[ATA_MAX_DEVICES];
1540 rc = ap->ops->probe_reset(ap, classes);
1542 for (i = 0; i < ATA_MAX_DEVICES; i++)
1543 ap->device[i].class = classes[i];
1545 printk(KERN_ERR "ata%u: probe reset failed, "
1546 "disabling port\n", ap->id);
1547 ata_port_disable(ap);
1550 ap->ops->phy_reset(ap);
1552 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1555 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1556 ata_dev_identify(ap, i);
1557 if (ata_dev_present(&ap->device[i])) {
1559 ata_dev_config(ap,i);
1563 if ((!found) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1564 goto err_out_disable;
1567 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1568 goto err_out_disable;
1573 ap->ops->port_disable(ap);
1579 * ata_port_probe - Mark port as enabled
1580 * @ap: Port for which we indicate enablement
1582 * Modify @ap data structure such that the system
1583 * thinks that the entire port is enabled.
1585 * LOCKING: host_set lock, or some other form of
1589 void ata_port_probe(struct ata_port *ap)
1591 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1595 * sata_print_link_status - Print SATA link status
1596 * @ap: SATA port to printk link status about
1598 * This function prints link speed and status of a SATA link.
1603 static void sata_print_link_status(struct ata_port *ap)
1608 if (!ap->ops->scr_read)
1611 sstatus = scr_read(ap, SCR_STATUS);
1613 if (sata_dev_present(ap)) {
1614 tmp = (sstatus >> 4) & 0xf;
1617 else if (tmp & (1 << 1))
1620 speed = "<unknown>";
1621 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1622 ap->id, speed, sstatus);
1624 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1630 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1631 * @ap: SATA port associated with target SATA PHY.
1633 * This function issues commands to standard SATA Sxxx
1634 * PHY registers, to wake up the phy (and device), and
1635 * clear any reset condition.
1638 * PCI/etc. bus probe sem.
1641 void __sata_phy_reset(struct ata_port *ap)
1644 unsigned long timeout = jiffies + (HZ * 5);
1646 if (ap->flags & ATA_FLAG_SATA_RESET) {
1647 /* issue phy wake/reset */
1648 scr_write_flush(ap, SCR_CONTROL, 0x301);
1649 /* Couldn't find anything in SATA I/II specs, but
1650 * AHCI-1.1 10.4.2 says at least 1 ms. */
1653 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1655 /* wait for phy to become ready, if necessary */
1658 sstatus = scr_read(ap, SCR_STATUS);
1659 if ((sstatus & 0xf) != 1)
1661 } while (time_before(jiffies, timeout));
1663 /* print link status */
1664 sata_print_link_status(ap);
1666 /* TODO: phy layer with polling, timeouts, etc. */
1667 if (sata_dev_present(ap))
1670 ata_port_disable(ap);
1672 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1675 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1676 ata_port_disable(ap);
1680 ap->cbl = ATA_CBL_SATA;
1684 * sata_phy_reset - Reset SATA bus.
1685 * @ap: SATA port associated with target SATA PHY.
1687 * This function resets the SATA bus, and then probes
1688 * the bus for devices.
1691 * PCI/etc. bus probe sem.
1694 void sata_phy_reset(struct ata_port *ap)
1696 __sata_phy_reset(ap);
1697 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1703 * ata_port_disable - Disable port.
1704 * @ap: Port to be disabled.
1706 * Modify @ap data structure such that the system
1707 * thinks that the entire port is disabled, and should
1708 * never attempt to probe or communicate with devices
1711 * LOCKING: host_set lock, or some other form of
1715 void ata_port_disable(struct ata_port *ap)
1717 ap->device[0].class = ATA_DEV_NONE;
1718 ap->device[1].class = ATA_DEV_NONE;
1719 ap->flags |= ATA_FLAG_PORT_DISABLED;
1723 * This mode timing computation functionality is ported over from
1724 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1727 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1728 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1729 * for PIO 5, which is a nonstandard extension and UDMA6, which
1730 * is currently supported only by Maxtor drives.
1733 static const struct ata_timing ata_timing[] = {
1735 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1736 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1737 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1738 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1740 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1741 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1742 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1744 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1746 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1747 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1748 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1750 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1751 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1752 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1754 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1755 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1756 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1758 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1759 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1760 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1762 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1767 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1768 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1770 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1772 q->setup = EZ(t->setup * 1000, T);
1773 q->act8b = EZ(t->act8b * 1000, T);
1774 q->rec8b = EZ(t->rec8b * 1000, T);
1775 q->cyc8b = EZ(t->cyc8b * 1000, T);
1776 q->active = EZ(t->active * 1000, T);
1777 q->recover = EZ(t->recover * 1000, T);
1778 q->cycle = EZ(t->cycle * 1000, T);
1779 q->udma = EZ(t->udma * 1000, UT);
1782 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1783 struct ata_timing *m, unsigned int what)
1785 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1786 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1787 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1788 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1789 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1790 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1791 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1792 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1795 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1797 const struct ata_timing *t;
1799 for (t = ata_timing; t->mode != speed; t++)
1800 if (t->mode == 0xFF)
1805 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1806 struct ata_timing *t, int T, int UT)
1808 const struct ata_timing *s;
1809 struct ata_timing p;
1815 if (!(s = ata_timing_find_mode(speed)))
1818 memcpy(t, s, sizeof(*s));
1821 * If the drive is an EIDE drive, it can tell us it needs extended
1822 * PIO/MW_DMA cycle timing.
1825 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1826 memset(&p, 0, sizeof(p));
1827 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1828 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1829 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1830 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1831 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1833 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1837 * Convert the timing to bus clock counts.
1840 ata_timing_quantize(t, t, T, UT);
1843 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1844 * S.M.A.R.T * and some other commands. We have to ensure that the
1845 * DMA cycle timing is slower/equal than the fastest PIO timing.
1848 if (speed > XFER_PIO_4) {
1849 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1850 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1854 * Lengthen active & recovery time so that cycle time is correct.
1857 if (t->act8b + t->rec8b < t->cyc8b) {
1858 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1859 t->rec8b = t->cyc8b - t->act8b;
1862 if (t->active + t->recover < t->cycle) {
1863 t->active += (t->cycle - (t->active + t->recover)) / 2;
1864 t->recover = t->cycle - t->active;
1870 static const struct {
1873 } xfer_mode_classes[] = {
1874 { ATA_SHIFT_UDMA, XFER_UDMA_0 },
1875 { ATA_SHIFT_MWDMA, XFER_MW_DMA_0 },
1876 { ATA_SHIFT_PIO, XFER_PIO_0 },
1879 static u8 base_from_shift(unsigned int shift)
1883 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++)
1884 if (xfer_mode_classes[i].shift == shift)
1885 return xfer_mode_classes[i].base;
1890 static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1895 if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1898 if (dev->xfer_shift == ATA_SHIFT_PIO)
1899 dev->flags |= ATA_DFLAG_PIO;
1901 ata_dev_set_xfermode(ap, dev);
1903 base = base_from_shift(dev->xfer_shift);
1904 ofs = dev->xfer_mode - base;
1905 idx = ofs + dev->xfer_shift;
1906 WARN_ON(idx >= ARRAY_SIZE(xfer_mode_str));
1908 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1909 idx, dev->xfer_shift, (int)dev->xfer_mode, (int)base, ofs);
1911 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1912 ap->id, dev->devno, xfer_mode_str[idx]);
1915 static int ata_host_set_pio(struct ata_port *ap)
1921 mask = ata_get_mode_mask(ap, ATA_SHIFT_PIO);
1924 printk(KERN_WARNING "ata%u: no PIO support\n", ap->id);
1928 base = base_from_shift(ATA_SHIFT_PIO);
1929 xfer_mode = base + x;
1931 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1932 (int)base, (int)xfer_mode, mask, x);
1934 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1935 struct ata_device *dev = &ap->device[i];
1936 if (ata_dev_present(dev)) {
1937 dev->pio_mode = xfer_mode;
1938 dev->xfer_mode = xfer_mode;
1939 dev->xfer_shift = ATA_SHIFT_PIO;
1940 if (ap->ops->set_piomode)
1941 ap->ops->set_piomode(ap, dev);
1948 static void ata_host_set_dma(struct ata_port *ap, u8 xfer_mode,
1949 unsigned int xfer_shift)
1953 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1954 struct ata_device *dev = &ap->device[i];
1955 if (ata_dev_present(dev)) {
1956 dev->dma_mode = xfer_mode;
1957 dev->xfer_mode = xfer_mode;
1958 dev->xfer_shift = xfer_shift;
1959 if (ap->ops->set_dmamode)
1960 ap->ops->set_dmamode(ap, dev);
1966 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1967 * @ap: port on which timings will be programmed
1969 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1972 * PCI/etc. bus probe sem.
1974 static void ata_set_mode(struct ata_port *ap)
1976 unsigned int xfer_shift;
1980 /* step 1: always set host PIO timings */
1981 rc = ata_host_set_pio(ap);
1985 /* step 2: choose the best data xfer mode */
1986 xfer_mode = xfer_shift = 0;
1987 rc = ata_choose_xfer_mode(ap, &xfer_mode, &xfer_shift);
1991 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1992 if (xfer_shift != ATA_SHIFT_PIO)
1993 ata_host_set_dma(ap, xfer_mode, xfer_shift);
1995 /* step 4: update devices' xfer mode */
1996 ata_dev_set_mode(ap, &ap->device[0]);
1997 ata_dev_set_mode(ap, &ap->device[1]);
1999 if (ap->flags & ATA_FLAG_PORT_DISABLED)
2002 if (ap->ops->post_set_mode)
2003 ap->ops->post_set_mode(ap);
2008 ata_port_disable(ap);
2012 * ata_busy_sleep - sleep until BSY clears, or timeout
2013 * @ap: port containing status register to be polled
2014 * @tmout_pat: impatience timeout
2015 * @tmout: overall timeout
2017 * Sleep until ATA Status register bit BSY clears,
2018 * or a timeout occurs.
2023 unsigned int ata_busy_sleep (struct ata_port *ap,
2024 unsigned long tmout_pat, unsigned long tmout)
2026 unsigned long timer_start, timeout;
2029 status = ata_busy_wait(ap, ATA_BUSY, 300);
2030 timer_start = jiffies;
2031 timeout = timer_start + tmout_pat;
2032 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2034 status = ata_busy_wait(ap, ATA_BUSY, 3);
2037 if (status & ATA_BUSY)
2038 printk(KERN_WARNING "ata%u is slow to respond, "
2039 "please be patient\n", ap->id);
2041 timeout = timer_start + tmout;
2042 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2044 status = ata_chk_status(ap);
2047 if (status & ATA_BUSY) {
2048 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
2049 ap->id, tmout / HZ);
2056 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2058 struct ata_ioports *ioaddr = &ap->ioaddr;
2059 unsigned int dev0 = devmask & (1 << 0);
2060 unsigned int dev1 = devmask & (1 << 1);
2061 unsigned long timeout;
2063 /* if device 0 was found in ata_devchk, wait for its
2067 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2069 /* if device 1 was found in ata_devchk, wait for
2070 * register access, then wait for BSY to clear
2072 timeout = jiffies + ATA_TMOUT_BOOT;
2076 ap->ops->dev_select(ap, 1);
2077 if (ap->flags & ATA_FLAG_MMIO) {
2078 nsect = readb((void __iomem *) ioaddr->nsect_addr);
2079 lbal = readb((void __iomem *) ioaddr->lbal_addr);
2081 nsect = inb(ioaddr->nsect_addr);
2082 lbal = inb(ioaddr->lbal_addr);
2084 if ((nsect == 1) && (lbal == 1))
2086 if (time_after(jiffies, timeout)) {
2090 msleep(50); /* give drive a breather */
2093 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2095 /* is all this really necessary? */
2096 ap->ops->dev_select(ap, 0);
2098 ap->ops->dev_select(ap, 1);
2100 ap->ops->dev_select(ap, 0);
2104 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
2105 * @ap: Port to reset and probe
2107 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
2108 * probe the bus. Not often used these days.
2111 * PCI/etc. bus probe sem.
2112 * Obtains host_set lock.
2116 static unsigned int ata_bus_edd(struct ata_port *ap)
2118 struct ata_taskfile tf;
2119 unsigned long flags;
2121 /* set up execute-device-diag (bus reset) taskfile */
2122 /* also, take interrupts to a known state (disabled) */
2123 DPRINTK("execute-device-diag\n");
2124 ata_tf_init(ap, &tf, 0);
2126 tf.command = ATA_CMD_EDD;
2127 tf.protocol = ATA_PROT_NODATA;
2130 spin_lock_irqsave(&ap->host_set->lock, flags);
2131 ata_tf_to_host(ap, &tf);
2132 spin_unlock_irqrestore(&ap->host_set->lock, flags);
2134 /* spec says at least 2ms. but who knows with those
2135 * crazy ATAPI devices...
2139 return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2142 static unsigned int ata_bus_softreset(struct ata_port *ap,
2143 unsigned int devmask)
2145 struct ata_ioports *ioaddr = &ap->ioaddr;
2147 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2149 /* software reset. causes dev0 to be selected */
2150 if (ap->flags & ATA_FLAG_MMIO) {
2151 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2152 udelay(20); /* FIXME: flush */
2153 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2154 udelay(20); /* FIXME: flush */
2155 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2157 outb(ap->ctl, ioaddr->ctl_addr);
2159 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2161 outb(ap->ctl, ioaddr->ctl_addr);
2164 /* spec mandates ">= 2ms" before checking status.
2165 * We wait 150ms, because that was the magic delay used for
2166 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2167 * between when the ATA command register is written, and then
2168 * status is checked. Because waiting for "a while" before
2169 * checking status is fine, post SRST, we perform this magic
2170 * delay here as well.
2174 ata_bus_post_reset(ap, devmask);
2180 * ata_bus_reset - reset host port and associated ATA channel
2181 * @ap: port to reset
2183 * This is typically the first time we actually start issuing
2184 * commands to the ATA channel. We wait for BSY to clear, then
2185 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2186 * result. Determine what devices, if any, are on the channel
2187 * by looking at the device 0/1 error register. Look at the signature
2188 * stored in each device's taskfile registers, to determine if
2189 * the device is ATA or ATAPI.
2192 * PCI/etc. bus probe sem.
2193 * Obtains host_set lock.
2196 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2199 void ata_bus_reset(struct ata_port *ap)
2201 struct ata_ioports *ioaddr = &ap->ioaddr;
2202 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2204 unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
2206 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2208 /* determine if device 0/1 are present */
2209 if (ap->flags & ATA_FLAG_SATA_RESET)
2212 dev0 = ata_devchk(ap, 0);
2214 dev1 = ata_devchk(ap, 1);
2218 devmask |= (1 << 0);
2220 devmask |= (1 << 1);
2222 /* select device 0 again */
2223 ap->ops->dev_select(ap, 0);
2225 /* issue bus reset */
2226 if (ap->flags & ATA_FLAG_SRST)
2227 rc = ata_bus_softreset(ap, devmask);
2228 else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
2229 /* set up device control */
2230 if (ap->flags & ATA_FLAG_MMIO)
2231 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2233 outb(ap->ctl, ioaddr->ctl_addr);
2234 rc = ata_bus_edd(ap);
2241 * determine by signature whether we have ATA or ATAPI devices
2243 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2244 if ((slave_possible) && (err != 0x81))
2245 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2247 /* re-enable interrupts */
2248 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2251 /* is double-select really necessary? */
2252 if (ap->device[1].class != ATA_DEV_NONE)
2253 ap->ops->dev_select(ap, 1);
2254 if (ap->device[0].class != ATA_DEV_NONE)
2255 ap->ops->dev_select(ap, 0);
2257 /* if no devices were detected, disable this port */
2258 if ((ap->device[0].class == ATA_DEV_NONE) &&
2259 (ap->device[1].class == ATA_DEV_NONE))
2262 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2263 /* set up device control for ATA_FLAG_SATA_RESET */
2264 if (ap->flags & ATA_FLAG_MMIO)
2265 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2267 outb(ap->ctl, ioaddr->ctl_addr);
2274 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2275 ap->ops->port_disable(ap);
2280 static int sata_phy_resume(struct ata_port *ap)
2282 unsigned long timeout = jiffies + (HZ * 5);
2285 scr_write_flush(ap, SCR_CONTROL, 0x300);
2287 /* Wait for phy to become ready, if necessary. */
2290 sstatus = scr_read(ap, SCR_STATUS);
2291 if ((sstatus & 0xf) != 1)
2293 } while (time_before(jiffies, timeout));
2299 * ata_std_softreset - reset host port via ATA SRST
2300 * @ap: port to reset
2301 * @verbose: fail verbosely
2302 * @classes: resulting classes of attached devices
2304 * Reset host port using ATA SRST. This function is to be used
2305 * as standard callback for ata_drive_*_reset() functions.
2308 * Kernel thread context (may sleep)
2311 * 0 on success, -errno otherwise.
2313 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2315 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2316 unsigned int devmask = 0, err_mask;
2321 /* determine if device 0/1 are present */
2322 if (ata_devchk(ap, 0))
2323 devmask |= (1 << 0);
2324 if (slave_possible && ata_devchk(ap, 1))
2325 devmask |= (1 << 1);
2327 /* devchk reports device presence without actual device on
2328 * most SATA controllers. Check SStatus and turn devmask off
2329 * if link is offline. Note that we should continue resetting
2330 * even when it seems like there's no device.
2332 if (ap->ops->scr_read && !sata_dev_present(ap))
2335 /* select device 0 again */
2336 ap->ops->dev_select(ap, 0);
2338 /* issue bus reset */
2339 DPRINTK("about to softreset, devmask=%x\n", devmask);
2340 err_mask = ata_bus_softreset(ap, devmask);
2343 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2346 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2351 /* determine by signature whether we have ATA or ATAPI devices */
2352 classes[0] = ata_dev_try_classify(ap, 0, &err);
2353 if (slave_possible && err != 0x81)
2354 classes[1] = ata_dev_try_classify(ap, 1, &err);
2356 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2361 * sata_std_hardreset - reset host port via SATA phy reset
2362 * @ap: port to reset
2363 * @verbose: fail verbosely
2364 * @class: resulting class of attached device
2366 * SATA phy-reset host port using DET bits of SControl register.
2367 * This function is to be used as standard callback for
2368 * ata_drive_*_reset().
2371 * Kernel thread context (may sleep)
2374 * 0 on success, -errno otherwise.
2376 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2382 /* Issue phy wake/reset */
2383 scr_write_flush(ap, SCR_CONTROL, 0x301);
2386 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2387 * 10.4.2 says at least 1 ms.
2391 /* Bring phy back */
2392 sata_phy_resume(ap);
2395 serror = scr_read(ap, SCR_ERROR);
2396 scr_write(ap, SCR_ERROR, serror);
2398 /* TODO: phy layer with polling, timeouts, etc. */
2399 if (!sata_dev_present(ap)) {
2400 *class = ATA_DEV_NONE;
2401 DPRINTK("EXIT, link offline\n");
2405 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2407 printk(KERN_ERR "ata%u: COMRESET failed "
2408 "(device not ready)\n", ap->id);
2410 DPRINTK("EXIT, device not ready\n");
2414 *class = ata_dev_try_classify(ap, 0, NULL);
2416 DPRINTK("EXIT, class=%u\n", *class);
2421 * ata_std_postreset - standard postreset callback
2422 * @ap: the target ata_port
2423 * @classes: classes of attached devices
2425 * This function is invoked after a successful reset. Note that
2426 * the device might have been reset more than once using
2427 * different reset methods before postreset is invoked.
2428 * postreset is also reponsible for setting cable type.
2430 * This function is to be used as standard callback for
2431 * ata_drive_*_reset().
2434 * Kernel thread context (may sleep)
2436 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2440 /* set cable type */
2441 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2442 ap->cbl = ATA_CBL_SATA;
2444 /* print link status */
2445 if (ap->cbl == ATA_CBL_SATA)
2446 sata_print_link_status(ap);
2448 /* bail out if no device is present */
2449 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2450 DPRINTK("EXIT, no device\n");
2454 /* is double-select really necessary? */
2455 if (classes[0] != ATA_DEV_NONE)
2456 ap->ops->dev_select(ap, 1);
2457 if (classes[1] != ATA_DEV_NONE)
2458 ap->ops->dev_select(ap, 0);
2460 /* re-enable interrupts & set up device control */
2461 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2468 * ata_std_probe_reset - standard probe reset method
2469 * @ap: prot to perform probe-reset
2470 * @classes: resulting classes of attached devices
2472 * The stock off-the-shelf ->probe_reset method.
2475 * Kernel thread context (may sleep)
2478 * 0 on success, -errno otherwise.
2480 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2482 ata_reset_fn_t hardreset;
2485 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2486 hardreset = sata_std_hardreset;
2488 return ata_drive_probe_reset(ap, NULL,
2489 ata_std_softreset, hardreset,
2490 ata_std_postreset, classes);
2493 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2494 ata_postreset_fn_t postreset,
2495 unsigned int *classes)
2499 for (i = 0; i < ATA_MAX_DEVICES; i++)
2500 classes[i] = ATA_DEV_UNKNOWN;
2502 rc = reset(ap, 0, classes);
2506 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2507 * is complete and convert all ATA_DEV_UNKNOWN to
2510 for (i = 0; i < ATA_MAX_DEVICES; i++)
2511 if (classes[i] != ATA_DEV_UNKNOWN)
2514 if (i < ATA_MAX_DEVICES)
2515 for (i = 0; i < ATA_MAX_DEVICES; i++)
2516 if (classes[i] == ATA_DEV_UNKNOWN)
2517 classes[i] = ATA_DEV_NONE;
2520 postreset(ap, classes);
2522 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2526 * ata_drive_probe_reset - Perform probe reset with given methods
2527 * @ap: port to reset
2528 * @probeinit: probeinit method (can be NULL)
2529 * @softreset: softreset method (can be NULL)
2530 * @hardreset: hardreset method (can be NULL)
2531 * @postreset: postreset method (can be NULL)
2532 * @classes: resulting classes of attached devices
2534 * Reset the specified port and classify attached devices using
2535 * given methods. This function prefers softreset but tries all
2536 * possible reset sequences to reset and classify devices. This
2537 * function is intended to be used for constructing ->probe_reset
2538 * callback by low level drivers.
2540 * Reset methods should follow the following rules.
2542 * - Return 0 on sucess, -errno on failure.
2543 * - If classification is supported, fill classes[] with
2544 * recognized class codes.
2545 * - If classification is not supported, leave classes[] alone.
2546 * - If verbose is non-zero, print error message on failure;
2547 * otherwise, shut up.
2550 * Kernel thread context (may sleep)
2553 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2554 * if classification fails, and any error code from reset
2557 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2558 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2559 ata_postreset_fn_t postreset, unsigned int *classes)
2567 rc = do_probe_reset(ap, softreset, postreset, classes);
2575 rc = do_probe_reset(ap, hardreset, postreset, classes);
2576 if (rc == 0 || rc != -ENODEV)
2580 rc = do_probe_reset(ap, softreset, postreset, classes);
2585 static void ata_pr_blacklisted(const struct ata_port *ap,
2586 const struct ata_device *dev)
2588 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2589 ap->id, dev->devno);
2592 static const char * const ata_dma_blacklist [] = {
2611 "Toshiba CD-ROM XM-6202B",
2612 "TOSHIBA CD-ROM XM-1702BC",
2614 "E-IDE CD-ROM CR-840",
2617 "SAMSUNG CD-ROM SC-148C",
2618 "SAMSUNG CD-ROM SC",
2620 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2624 static int ata_dma_blacklisted(const struct ata_device *dev)
2626 unsigned char model_num[40];
2631 ata_dev_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2634 len = strnlen(s, sizeof(model_num));
2636 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2637 while ((len > 0) && (s[len - 1] == ' ')) {
2642 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i++)
2643 if (!strncmp(ata_dma_blacklist[i], s, len))
2649 static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift)
2651 const struct ata_device *master, *slave;
2654 master = &ap->device[0];
2655 slave = &ap->device[1];
2657 assert (ata_dev_present(master) || ata_dev_present(slave));
2659 if (shift == ATA_SHIFT_UDMA) {
2660 mask = ap->udma_mask;
2661 if (ata_dev_present(master)) {
2662 mask &= (master->id[ATA_ID_UDMA_MODES] & 0xff);
2663 if (ata_dma_blacklisted(master)) {
2665 ata_pr_blacklisted(ap, master);
2668 if (ata_dev_present(slave)) {
2669 mask &= (slave->id[ATA_ID_UDMA_MODES] & 0xff);
2670 if (ata_dma_blacklisted(slave)) {
2672 ata_pr_blacklisted(ap, slave);
2676 else if (shift == ATA_SHIFT_MWDMA) {
2677 mask = ap->mwdma_mask;
2678 if (ata_dev_present(master)) {
2679 mask &= (master->id[ATA_ID_MWDMA_MODES] & 0x07);
2680 if (ata_dma_blacklisted(master)) {
2682 ata_pr_blacklisted(ap, master);
2685 if (ata_dev_present(slave)) {
2686 mask &= (slave->id[ATA_ID_MWDMA_MODES] & 0x07);
2687 if (ata_dma_blacklisted(slave)) {
2689 ata_pr_blacklisted(ap, slave);
2693 else if (shift == ATA_SHIFT_PIO) {
2694 mask = ap->pio_mask;
2695 if (ata_dev_present(master)) {
2696 /* spec doesn't return explicit support for
2697 * PIO0-2, so we fake it
2699 u16 tmp_mode = master->id[ATA_ID_PIO_MODES] & 0x03;
2704 if (ata_dev_present(slave)) {
2705 /* spec doesn't return explicit support for
2706 * PIO0-2, so we fake it
2708 u16 tmp_mode = slave->id[ATA_ID_PIO_MODES] & 0x03;
2715 mask = 0xffffffff; /* shut up compiler warning */
2722 /* find greatest bit */
2723 static int fgb(u32 bitmap)
2728 for (i = 0; i < 32; i++)
2729 if (bitmap & (1 << i))
2736 * ata_choose_xfer_mode - attempt to find best transfer mode
2737 * @ap: Port for which an xfer mode will be selected
2738 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2739 * @xfer_shift_out: (output) bit shift that selects this mode
2741 * Based on host and device capabilities, determine the
2742 * maximum transfer mode that is amenable to all.
2745 * PCI/etc. bus probe sem.
2748 * Zero on success, negative on error.
2751 static int ata_choose_xfer_mode(const struct ata_port *ap,
2753 unsigned int *xfer_shift_out)
2755 unsigned int mask, shift;
2758 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++) {
2759 shift = xfer_mode_classes[i].shift;
2760 mask = ata_get_mode_mask(ap, shift);
2764 *xfer_mode_out = xfer_mode_classes[i].base + x;
2765 *xfer_shift_out = shift;
2774 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2775 * @ap: Port associated with device @dev
2776 * @dev: Device to which command will be sent
2778 * Issue SET FEATURES - XFER MODE command to device @dev
2782 * PCI/etc. bus probe sem.
2785 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
2787 struct ata_taskfile tf;
2789 /* set up set-features taskfile */
2790 DPRINTK("set features - xfer mode\n");
2792 ata_tf_init(ap, &tf, dev->devno);
2793 tf.command = ATA_CMD_SET_FEATURES;
2794 tf.feature = SETFEATURES_XFER;
2795 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2796 tf.protocol = ATA_PROT_NODATA;
2797 tf.nsect = dev->xfer_mode;
2799 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2800 printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
2802 ata_port_disable(ap);
2809 * ata_dev_reread_id - Reread the device identify device info
2810 * @ap: port where the device is
2811 * @dev: device to reread the identify device info
2816 static void ata_dev_reread_id(struct ata_port *ap, struct ata_device *dev)
2818 struct ata_taskfile tf;
2820 ata_tf_init(ap, &tf, dev->devno);
2822 if (dev->class == ATA_DEV_ATA) {
2823 tf.command = ATA_CMD_ID_ATA;
2824 DPRINTK("do ATA identify\n");
2826 tf.command = ATA_CMD_ID_ATAPI;
2827 DPRINTK("do ATAPI identify\n");
2830 tf.flags |= ATA_TFLAG_DEVICE;
2831 tf.protocol = ATA_PROT_PIO;
2833 if (ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
2834 dev->id, sizeof(dev->id)))
2837 swap_buf_le16(dev->id, ATA_ID_WORDS);
2845 printk(KERN_ERR "ata%u: failed to reread ID, disabled\n", ap->id);
2846 ata_port_disable(ap);
2850 * ata_dev_init_params - Issue INIT DEV PARAMS command
2851 * @ap: Port associated with device @dev
2852 * @dev: Device to which command will be sent
2857 static void ata_dev_init_params(struct ata_port *ap, struct ata_device *dev)
2859 struct ata_taskfile tf;
2860 u16 sectors = dev->id[6];
2861 u16 heads = dev->id[3];
2863 /* Number of sectors per track 1-255. Number of heads 1-16 */
2864 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2867 /* set up init dev params taskfile */
2868 DPRINTK("init dev params \n");
2870 ata_tf_init(ap, &tf, dev->devno);
2871 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2872 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2873 tf.protocol = ATA_PROT_NODATA;
2875 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2877 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2878 printk(KERN_ERR "ata%u: failed to init parameters, disabled\n",
2880 ata_port_disable(ap);
2887 * ata_sg_clean - Unmap DMA memory associated with command
2888 * @qc: Command containing DMA memory to be released
2890 * Unmap all mapped DMA memory associated with this command.
2893 * spin_lock_irqsave(host_set lock)
2896 static void ata_sg_clean(struct ata_queued_cmd *qc)
2898 struct ata_port *ap = qc->ap;
2899 struct scatterlist *sg = qc->__sg;
2900 int dir = qc->dma_dir;
2901 void *pad_buf = NULL;
2903 assert(qc->flags & ATA_QCFLAG_DMAMAP);
2906 if (qc->flags & ATA_QCFLAG_SINGLE)
2907 assert(qc->n_elem == 1);
2909 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2911 /* if we padded the buffer out to 32-bit bound, and data
2912 * xfer direction is from-device, we must copy from the
2913 * pad buffer back into the supplied buffer
2915 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2916 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2918 if (qc->flags & ATA_QCFLAG_SG) {
2920 dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
2921 /* restore last sg */
2922 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2924 struct scatterlist *psg = &qc->pad_sgent;
2925 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2926 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2927 kunmap_atomic(addr, KM_IRQ0);
2930 if (sg_dma_len(&sg[0]) > 0)
2931 dma_unmap_single(ap->host_set->dev,
2932 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2935 sg->length += qc->pad_len;
2937 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2938 pad_buf, qc->pad_len);
2941 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2946 * ata_fill_sg - Fill PCI IDE PRD table
2947 * @qc: Metadata associated with taskfile to be transferred
2949 * Fill PCI IDE PRD (scatter-gather) table with segments
2950 * associated with the current disk command.
2953 * spin_lock_irqsave(host_set lock)
2956 static void ata_fill_sg(struct ata_queued_cmd *qc)
2958 struct ata_port *ap = qc->ap;
2959 struct scatterlist *sg;
2962 assert(qc->__sg != NULL);
2963 assert(qc->n_elem > 0);
2966 ata_for_each_sg(sg, qc) {
2970 /* determine if physical DMA addr spans 64K boundary.
2971 * Note h/w doesn't support 64-bit, so we unconditionally
2972 * truncate dma_addr_t to u32.
2974 addr = (u32) sg_dma_address(sg);
2975 sg_len = sg_dma_len(sg);
2978 offset = addr & 0xffff;
2980 if ((offset + sg_len) > 0x10000)
2981 len = 0x10000 - offset;
2983 ap->prd[idx].addr = cpu_to_le32(addr);
2984 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2985 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2994 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2997 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2998 * @qc: Metadata associated with taskfile to check
3000 * Allow low-level driver to filter ATA PACKET commands, returning
3001 * a status indicating whether or not it is OK to use DMA for the
3002 * supplied PACKET command.
3005 * spin_lock_irqsave(host_set lock)
3007 * RETURNS: 0 when ATAPI DMA can be used
3010 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3012 struct ata_port *ap = qc->ap;
3013 int rc = 0; /* Assume ATAPI DMA is OK by default */
3015 if (ap->ops->check_atapi_dma)
3016 rc = ap->ops->check_atapi_dma(qc);
3021 * ata_qc_prep - Prepare taskfile for submission
3022 * @qc: Metadata associated with taskfile to be prepared
3024 * Prepare ATA taskfile for submission.
3027 * spin_lock_irqsave(host_set lock)
3029 void ata_qc_prep(struct ata_queued_cmd *qc)
3031 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3038 * ata_sg_init_one - Associate command with memory buffer
3039 * @qc: Command to be associated
3040 * @buf: Memory buffer
3041 * @buflen: Length of memory buffer, in bytes.
3043 * Initialize the data-related elements of queued_cmd @qc
3044 * to point to a single memory buffer, @buf of byte length @buflen.
3047 * spin_lock_irqsave(host_set lock)
3050 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3052 struct scatterlist *sg;
3054 qc->flags |= ATA_QCFLAG_SINGLE;
3056 memset(&qc->sgent, 0, sizeof(qc->sgent));
3057 qc->__sg = &qc->sgent;
3059 qc->orig_n_elem = 1;
3063 sg_init_one(sg, buf, buflen);
3067 * ata_sg_init - Associate command with scatter-gather table.
3068 * @qc: Command to be associated
3069 * @sg: Scatter-gather table.
3070 * @n_elem: Number of elements in s/g table.
3072 * Initialize the data-related elements of queued_cmd @qc
3073 * to point to a scatter-gather table @sg, containing @n_elem
3077 * spin_lock_irqsave(host_set lock)
3080 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3081 unsigned int n_elem)
3083 qc->flags |= ATA_QCFLAG_SG;
3085 qc->n_elem = n_elem;
3086 qc->orig_n_elem = n_elem;
3090 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3091 * @qc: Command with memory buffer to be mapped.
3093 * DMA-map the memory buffer associated with queued_cmd @qc.
3096 * spin_lock_irqsave(host_set lock)
3099 * Zero on success, negative on error.
3102 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3104 struct ata_port *ap = qc->ap;
3105 int dir = qc->dma_dir;
3106 struct scatterlist *sg = qc->__sg;
3107 dma_addr_t dma_address;
3109 /* we must lengthen transfers to end on a 32-bit boundary */
3110 qc->pad_len = sg->length & 3;
3112 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3113 struct scatterlist *psg = &qc->pad_sgent;
3115 assert(qc->dev->class == ATA_DEV_ATAPI);
3117 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3119 if (qc->tf.flags & ATA_TFLAG_WRITE)
3120 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3123 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3124 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3126 sg->length -= qc->pad_len;
3128 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3129 sg->length, qc->pad_len);
3133 sg_dma_address(sg) = 0;
3137 dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
3139 if (dma_mapping_error(dma_address)) {
3141 sg->length += qc->pad_len;
3145 sg_dma_address(sg) = dma_address;
3147 sg_dma_len(sg) = sg->length;
3149 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3150 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3156 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3157 * @qc: Command with scatter-gather table to be mapped.
3159 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3162 * spin_lock_irqsave(host_set lock)
3165 * Zero on success, negative on error.
3169 static int ata_sg_setup(struct ata_queued_cmd *qc)
3171 struct ata_port *ap = qc->ap;
3172 struct scatterlist *sg = qc->__sg;
3173 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3174 int n_elem, pre_n_elem, dir, trim_sg = 0;
3176 VPRINTK("ENTER, ata%u\n", ap->id);
3177 assert(qc->flags & ATA_QCFLAG_SG);
3179 /* we must lengthen transfers to end on a 32-bit boundary */
3180 qc->pad_len = lsg->length & 3;
3182 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3183 struct scatterlist *psg = &qc->pad_sgent;
3184 unsigned int offset;
3186 assert(qc->dev->class == ATA_DEV_ATAPI);
3188 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3191 * psg->page/offset are used to copy to-be-written
3192 * data in this function or read data in ata_sg_clean.
3194 offset = lsg->offset + lsg->length - qc->pad_len;
3195 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3196 psg->offset = offset_in_page(offset);
3198 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3199 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3200 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3201 kunmap_atomic(addr, KM_IRQ0);
3204 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3205 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3207 lsg->length -= qc->pad_len;
3208 if (lsg->length == 0)
3211 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3212 qc->n_elem - 1, lsg->length, qc->pad_len);
3215 pre_n_elem = qc->n_elem;
3216 if (trim_sg && pre_n_elem)
3225 n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
3227 /* restore last sg */
3228 lsg->length += qc->pad_len;
3232 DPRINTK("%d sg elements mapped\n", n_elem);
3235 qc->n_elem = n_elem;
3241 * ata_poll_qc_complete - turn irq back on and finish qc
3242 * @qc: Command to complete
3243 * @err_mask: ATA status register content
3246 * None. (grabs host lock)
3249 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3251 struct ata_port *ap = qc->ap;
3252 unsigned long flags;
3254 spin_lock_irqsave(&ap->host_set->lock, flags);
3255 ap->flags &= ~ATA_FLAG_NOINTR;
3257 ata_qc_complete(qc);
3258 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3262 * ata_pio_poll - poll using PIO, depending on current state
3263 * @ap: the target ata_port
3266 * None. (executing in kernel thread context)
3269 * timeout value to use
3272 static unsigned long ata_pio_poll(struct ata_port *ap)
3274 struct ata_queued_cmd *qc;
3276 unsigned int poll_state = HSM_ST_UNKNOWN;
3277 unsigned int reg_state = HSM_ST_UNKNOWN;
3279 qc = ata_qc_from_tag(ap, ap->active_tag);
3282 switch (ap->hsm_task_state) {
3285 poll_state = HSM_ST_POLL;
3289 case HSM_ST_LAST_POLL:
3290 poll_state = HSM_ST_LAST_POLL;
3291 reg_state = HSM_ST_LAST;
3298 status = ata_chk_status(ap);
3299 if (status & ATA_BUSY) {
3300 if (time_after(jiffies, ap->pio_task_timeout)) {
3301 qc->err_mask |= AC_ERR_TIMEOUT;
3302 ap->hsm_task_state = HSM_ST_TMOUT;
3305 ap->hsm_task_state = poll_state;
3306 return ATA_SHORT_PAUSE;
3309 ap->hsm_task_state = reg_state;
3314 * ata_pio_complete - check if drive is busy or idle
3315 * @ap: the target ata_port
3318 * None. (executing in kernel thread context)
3321 * Non-zero if qc completed, zero otherwise.
3324 static int ata_pio_complete (struct ata_port *ap)
3326 struct ata_queued_cmd *qc;
3330 * This is purely heuristic. This is a fast path. Sometimes when
3331 * we enter, BSY will be cleared in a chk-status or two. If not,
3332 * the drive is probably seeking or something. Snooze for a couple
3333 * msecs, then chk-status again. If still busy, fall back to
3334 * HSM_ST_POLL state.
3336 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3337 if (drv_stat & ATA_BUSY) {
3339 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3340 if (drv_stat & ATA_BUSY) {
3341 ap->hsm_task_state = HSM_ST_LAST_POLL;
3342 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3347 qc = ata_qc_from_tag(ap, ap->active_tag);
3350 drv_stat = ata_wait_idle(ap);
3351 if (!ata_ok(drv_stat)) {
3352 qc->err_mask |= __ac_err_mask(drv_stat);
3353 ap->hsm_task_state = HSM_ST_ERR;
3357 ap->hsm_task_state = HSM_ST_IDLE;
3359 assert(qc->err_mask == 0);
3360 ata_poll_qc_complete(qc);
3362 /* another command may start at this point */
3369 * swap_buf_le16 - swap halves of 16-bit words in place
3370 * @buf: Buffer to swap
3371 * @buf_words: Number of 16-bit words in buffer.
3373 * Swap halves of 16-bit words if needed to convert from
3374 * little-endian byte order to native cpu byte order, or
3378 * Inherited from caller.
3380 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3385 for (i = 0; i < buf_words; i++)
3386 buf[i] = le16_to_cpu(buf[i]);
3387 #endif /* __BIG_ENDIAN */
3391 * ata_mmio_data_xfer - Transfer data by MMIO
3392 * @ap: port to read/write
3394 * @buflen: buffer length
3395 * @write_data: read/write
3397 * Transfer data from/to the device data register by MMIO.
3400 * Inherited from caller.
3403 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3404 unsigned int buflen, int write_data)
3407 unsigned int words = buflen >> 1;
3408 u16 *buf16 = (u16 *) buf;
3409 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3411 /* Transfer multiple of 2 bytes */
3413 for (i = 0; i < words; i++)
3414 writew(le16_to_cpu(buf16[i]), mmio);
3416 for (i = 0; i < words; i++)
3417 buf16[i] = cpu_to_le16(readw(mmio));
3420 /* Transfer trailing 1 byte, if any. */
3421 if (unlikely(buflen & 0x01)) {
3422 u16 align_buf[1] = { 0 };
3423 unsigned char *trailing_buf = buf + buflen - 1;
3426 memcpy(align_buf, trailing_buf, 1);
3427 writew(le16_to_cpu(align_buf[0]), mmio);
3429 align_buf[0] = cpu_to_le16(readw(mmio));
3430 memcpy(trailing_buf, align_buf, 1);
3436 * ata_pio_data_xfer - Transfer data by PIO
3437 * @ap: port to read/write
3439 * @buflen: buffer length
3440 * @write_data: read/write
3442 * Transfer data from/to the device data register by PIO.
3445 * Inherited from caller.
3448 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3449 unsigned int buflen, int write_data)
3451 unsigned int words = buflen >> 1;
3453 /* Transfer multiple of 2 bytes */
3455 outsw(ap->ioaddr.data_addr, buf, words);
3457 insw(ap->ioaddr.data_addr, buf, words);
3459 /* Transfer trailing 1 byte, if any. */
3460 if (unlikely(buflen & 0x01)) {
3461 u16 align_buf[1] = { 0 };
3462 unsigned char *trailing_buf = buf + buflen - 1;
3465 memcpy(align_buf, trailing_buf, 1);
3466 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3468 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3469 memcpy(trailing_buf, align_buf, 1);
3475 * ata_data_xfer - Transfer data from/to the data register.
3476 * @ap: port to read/write
3478 * @buflen: buffer length
3479 * @do_write: read/write
3481 * Transfer data from/to the device data register.
3484 * Inherited from caller.
3487 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3488 unsigned int buflen, int do_write)
3490 /* Make the crap hardware pay the costs not the good stuff */
3491 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3492 unsigned long flags;
3493 local_irq_save(flags);
3494 if (ap->flags & ATA_FLAG_MMIO)
3495 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3497 ata_pio_data_xfer(ap, buf, buflen, do_write);
3498 local_irq_restore(flags);
3500 if (ap->flags & ATA_FLAG_MMIO)
3501 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3503 ata_pio_data_xfer(ap, buf, buflen, do_write);
3508 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3509 * @qc: Command on going
3511 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3514 * Inherited from caller.
3517 static void ata_pio_sector(struct ata_queued_cmd *qc)
3519 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3520 struct scatterlist *sg = qc->__sg;
3521 struct ata_port *ap = qc->ap;
3523 unsigned int offset;
3526 if (qc->cursect == (qc->nsect - 1))
3527 ap->hsm_task_state = HSM_ST_LAST;
3529 page = sg[qc->cursg].page;
3530 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3532 /* get the current page and offset */
3533 page = nth_page(page, (offset >> PAGE_SHIFT));
3534 offset %= PAGE_SIZE;
3536 buf = kmap(page) + offset;
3541 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3546 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3548 /* do the actual data transfer */
3549 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3550 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3556 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3557 * @qc: Command on going
3558 * @bytes: number of bytes
3560 * Transfer Transfer data from/to the ATAPI device.
3563 * Inherited from caller.
3567 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3569 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3570 struct scatterlist *sg = qc->__sg;
3571 struct ata_port *ap = qc->ap;
3574 unsigned int offset, count;
3576 if (qc->curbytes + bytes >= qc->nbytes)
3577 ap->hsm_task_state = HSM_ST_LAST;
3580 if (unlikely(qc->cursg >= qc->n_elem)) {
3582 * The end of qc->sg is reached and the device expects
3583 * more data to transfer. In order not to overrun qc->sg
3584 * and fulfill length specified in the byte count register,
3585 * - for read case, discard trailing data from the device
3586 * - for write case, padding zero data to the device
3588 u16 pad_buf[1] = { 0 };
3589 unsigned int words = bytes >> 1;
3592 if (words) /* warning if bytes > 1 */
3593 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3596 for (i = 0; i < words; i++)
3597 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3599 ap->hsm_task_state = HSM_ST_LAST;
3603 sg = &qc->__sg[qc->cursg];
3606 offset = sg->offset + qc->cursg_ofs;
3608 /* get the current page and offset */
3609 page = nth_page(page, (offset >> PAGE_SHIFT));
3610 offset %= PAGE_SIZE;
3612 /* don't overrun current sg */
3613 count = min(sg->length - qc->cursg_ofs, bytes);
3615 /* don't cross page boundaries */
3616 count = min(count, (unsigned int)PAGE_SIZE - offset);
3618 buf = kmap(page) + offset;
3621 qc->curbytes += count;
3622 qc->cursg_ofs += count;
3624 if (qc->cursg_ofs == sg->length) {
3629 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3631 /* do the actual data transfer */
3632 ata_data_xfer(ap, buf, count, do_write);
3641 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3642 * @qc: Command on going
3644 * Transfer Transfer data from/to the ATAPI device.
3647 * Inherited from caller.
3650 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3652 struct ata_port *ap = qc->ap;
3653 struct ata_device *dev = qc->dev;
3654 unsigned int ireason, bc_lo, bc_hi, bytes;
3655 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3657 ap->ops->tf_read(ap, &qc->tf);
3658 ireason = qc->tf.nsect;
3659 bc_lo = qc->tf.lbam;
3660 bc_hi = qc->tf.lbah;
3661 bytes = (bc_hi << 8) | bc_lo;
3663 /* shall be cleared to zero, indicating xfer of data */
3664 if (ireason & (1 << 0))
3667 /* make sure transfer direction matches expected */
3668 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3669 if (do_write != i_write)
3672 __atapi_pio_bytes(qc, bytes);
3677 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3678 ap->id, dev->devno);
3679 qc->err_mask |= AC_ERR_HSM;
3680 ap->hsm_task_state = HSM_ST_ERR;
3684 * ata_pio_block - start PIO on a block
3685 * @ap: the target ata_port
3688 * None. (executing in kernel thread context)
3691 static void ata_pio_block(struct ata_port *ap)
3693 struct ata_queued_cmd *qc;
3697 * This is purely heuristic. This is a fast path.
3698 * Sometimes when we enter, BSY will be cleared in
3699 * a chk-status or two. If not, the drive is probably seeking
3700 * or something. Snooze for a couple msecs, then
3701 * chk-status again. If still busy, fall back to
3702 * HSM_ST_POLL state.
3704 status = ata_busy_wait(ap, ATA_BUSY, 5);
3705 if (status & ATA_BUSY) {
3707 status = ata_busy_wait(ap, ATA_BUSY, 10);
3708 if (status & ATA_BUSY) {
3709 ap->hsm_task_state = HSM_ST_POLL;
3710 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3715 qc = ata_qc_from_tag(ap, ap->active_tag);
3719 if (status & (ATA_ERR | ATA_DF)) {
3720 qc->err_mask |= AC_ERR_DEV;
3721 ap->hsm_task_state = HSM_ST_ERR;
3725 /* transfer data if any */
3726 if (is_atapi_taskfile(&qc->tf)) {
3727 /* DRQ=0 means no more data to transfer */
3728 if ((status & ATA_DRQ) == 0) {
3729 ap->hsm_task_state = HSM_ST_LAST;
3733 atapi_pio_bytes(qc);
3735 /* handle BSY=0, DRQ=0 as error */
3736 if ((status & ATA_DRQ) == 0) {
3737 qc->err_mask |= AC_ERR_HSM;
3738 ap->hsm_task_state = HSM_ST_ERR;
3746 static void ata_pio_error(struct ata_port *ap)
3748 struct ata_queued_cmd *qc;
3750 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3752 qc = ata_qc_from_tag(ap, ap->active_tag);
3755 /* make sure qc->err_mask is available to
3756 * know what's wrong and recover
3758 assert(qc->err_mask);
3760 ap->hsm_task_state = HSM_ST_IDLE;
3762 ata_poll_qc_complete(qc);
3765 static void ata_pio_task(void *_data)
3767 struct ata_port *ap = _data;
3768 unsigned long timeout;
3775 switch (ap->hsm_task_state) {
3784 qc_completed = ata_pio_complete(ap);
3788 case HSM_ST_LAST_POLL:
3789 timeout = ata_pio_poll(ap);
3799 ata_queue_delayed_pio_task(ap, timeout);
3800 else if (!qc_completed)
3805 * ata_qc_timeout - Handle timeout of queued command
3806 * @qc: Command that timed out
3808 * Some part of the kernel (currently, only the SCSI layer)
3809 * has noticed that the active command on port @ap has not
3810 * completed after a specified length of time. Handle this
3811 * condition by disabling DMA (if necessary) and completing
3812 * transactions, with error if necessary.
3814 * This also handles the case of the "lost interrupt", where
3815 * for some reason (possibly hardware bug, possibly driver bug)
3816 * an interrupt was not delivered to the driver, even though the
3817 * transaction completed successfully.
3820 * Inherited from SCSI layer (none, can sleep)
3823 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3825 struct ata_port *ap = qc->ap;
3826 struct ata_host_set *host_set = ap->host_set;
3827 u8 host_stat = 0, drv_stat;
3828 unsigned long flags;
3832 ata_flush_pio_tasks(ap);
3833 ap->hsm_task_state = HSM_ST_IDLE;
3835 spin_lock_irqsave(&host_set->lock, flags);
3837 switch (qc->tf.protocol) {
3840 case ATA_PROT_ATAPI_DMA:
3841 host_stat = ap->ops->bmdma_status(ap);
3843 /* before we do anything else, clear DMA-Start bit */
3844 ap->ops->bmdma_stop(qc);
3850 drv_stat = ata_chk_status(ap);
3852 /* ack bmdma irq events */
3853 ap->ops->irq_clear(ap);
3855 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3856 ap->id, qc->tf.command, drv_stat, host_stat);
3858 /* complete taskfile transaction */
3859 qc->err_mask |= ac_err_mask(drv_stat);
3863 spin_unlock_irqrestore(&host_set->lock, flags);
3865 ata_eh_qc_complete(qc);
3871 * ata_eng_timeout - Handle timeout of queued command
3872 * @ap: Port on which timed-out command is active
3874 * Some part of the kernel (currently, only the SCSI layer)
3875 * has noticed that the active command on port @ap has not
3876 * completed after a specified length of time. Handle this
3877 * condition by disabling DMA (if necessary) and completing
3878 * transactions, with error if necessary.
3880 * This also handles the case of the "lost interrupt", where
3881 * for some reason (possibly hardware bug, possibly driver bug)
3882 * an interrupt was not delivered to the driver, even though the
3883 * transaction completed successfully.
3886 * Inherited from SCSI layer (none, can sleep)
3889 void ata_eng_timeout(struct ata_port *ap)
3891 struct ata_queued_cmd *qc;
3895 qc = ata_qc_from_tag(ap, ap->active_tag);
3899 printk(KERN_ERR "ata%u: BUG: timeout without command\n",
3909 * ata_qc_new - Request an available ATA command, for queueing
3910 * @ap: Port associated with device @dev
3911 * @dev: Device from whom we request an available command structure
3917 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3919 struct ata_queued_cmd *qc = NULL;
3922 for (i = 0; i < ATA_MAX_QUEUE; i++)
3923 if (!test_and_set_bit(i, &ap->qactive)) {
3924 qc = ata_qc_from_tag(ap, i);
3935 * ata_qc_new_init - Request an available ATA command, and initialize it
3936 * @ap: Port associated with device @dev
3937 * @dev: Device from whom we request an available command structure
3943 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3944 struct ata_device *dev)
3946 struct ata_queued_cmd *qc;
3948 qc = ata_qc_new(ap);
3961 * ata_qc_free - free unused ata_queued_cmd
3962 * @qc: Command to complete
3964 * Designed to free unused ata_queued_cmd object
3965 * in case something prevents using it.
3968 * spin_lock_irqsave(host_set lock)
3970 void ata_qc_free(struct ata_queued_cmd *qc)
3972 struct ata_port *ap = qc->ap;
3975 assert(qc != NULL); /* ata_qc_from_tag _might_ return NULL */
3979 if (likely(ata_tag_valid(tag))) {
3980 if (tag == ap->active_tag)
3981 ap->active_tag = ATA_TAG_POISON;
3982 qc->tag = ATA_TAG_POISON;
3983 clear_bit(tag, &ap->qactive);
3988 * ata_qc_complete - Complete an active ATA command
3989 * @qc: Command to complete
3990 * @err_mask: ATA Status register contents
3992 * Indicate to the mid and upper layers that an ATA
3993 * command has completed, with either an ok or not-ok status.
3996 * spin_lock_irqsave(host_set lock)
3999 void ata_qc_complete(struct ata_queued_cmd *qc)
4001 assert(qc != NULL); /* ata_qc_from_tag _might_ return NULL */
4002 assert(qc->flags & ATA_QCFLAG_ACTIVE);
4004 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4007 /* atapi: mark qc as inactive to prevent the interrupt handler
4008 * from completing the command twice later, before the error handler
4009 * is called. (when rc != 0 and atapi request sense is needed)
4011 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4013 /* call completion callback */
4014 qc->complete_fn(qc);
4017 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4019 struct ata_port *ap = qc->ap;
4021 switch (qc->tf.protocol) {
4023 case ATA_PROT_ATAPI_DMA:
4026 case ATA_PROT_ATAPI:
4028 case ATA_PROT_PIO_MULT:
4029 if (ap->flags & ATA_FLAG_PIO_DMA)
4042 * ata_qc_issue - issue taskfile to device
4043 * @qc: command to issue to device
4045 * Prepare an ATA command to submission to device.
4046 * This includes mapping the data into a DMA-able
4047 * area, filling in the S/G table, and finally
4048 * writing the taskfile to hardware, starting the command.
4051 * spin_lock_irqsave(host_set lock)
4054 * Zero on success, AC_ERR_* mask on failure
4057 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
4059 struct ata_port *ap = qc->ap;
4061 if (ata_should_dma_map(qc)) {
4062 if (qc->flags & ATA_QCFLAG_SG) {
4063 if (ata_sg_setup(qc))
4065 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4066 if (ata_sg_setup_one(qc))
4070 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4073 ap->ops->qc_prep(qc);
4075 qc->ap->active_tag = qc->tag;
4076 qc->flags |= ATA_QCFLAG_ACTIVE;
4078 return ap->ops->qc_issue(qc);
4081 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4082 return AC_ERR_SYSTEM;
4087 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4088 * @qc: command to issue to device
4090 * Using various libata functions and hooks, this function
4091 * starts an ATA command. ATA commands are grouped into
4092 * classes called "protocols", and issuing each type of protocol
4093 * is slightly different.
4095 * May be used as the qc_issue() entry in ata_port_operations.
4098 * spin_lock_irqsave(host_set lock)
4101 * Zero on success, AC_ERR_* mask on failure
4104 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4106 struct ata_port *ap = qc->ap;
4108 ata_dev_select(ap, qc->dev->devno, 1, 0);
4110 switch (qc->tf.protocol) {
4111 case ATA_PROT_NODATA:
4112 ata_tf_to_host(ap, &qc->tf);
4116 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4117 ap->ops->bmdma_setup(qc); /* set up bmdma */
4118 ap->ops->bmdma_start(qc); /* initiate bmdma */
4121 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4122 ata_qc_set_polling(qc);
4123 ata_tf_to_host(ap, &qc->tf);
4124 ap->hsm_task_state = HSM_ST;
4125 ata_queue_pio_task(ap);
4128 case ATA_PROT_ATAPI:
4129 ata_qc_set_polling(qc);
4130 ata_tf_to_host(ap, &qc->tf);
4131 ata_queue_packet_task(ap);
4134 case ATA_PROT_ATAPI_NODATA:
4135 ap->flags |= ATA_FLAG_NOINTR;
4136 ata_tf_to_host(ap, &qc->tf);
4137 ata_queue_packet_task(ap);
4140 case ATA_PROT_ATAPI_DMA:
4141 ap->flags |= ATA_FLAG_NOINTR;
4142 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4143 ap->ops->bmdma_setup(qc); /* set up bmdma */
4144 ata_queue_packet_task(ap);
4149 return AC_ERR_SYSTEM;
4156 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
4157 * @qc: Info associated with this ATA transaction.
4160 * spin_lock_irqsave(host_set lock)
4163 static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
4165 struct ata_port *ap = qc->ap;
4166 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
4168 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4170 /* load PRD table addr. */
4171 mb(); /* make sure PRD table writes are visible to controller */
4172 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
4174 /* specify data direction, triple-check start bit is clear */
4175 dmactl = readb(mmio + ATA_DMA_CMD);
4176 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
4178 dmactl |= ATA_DMA_WR;
4179 writeb(dmactl, mmio + ATA_DMA_CMD);
4181 /* issue r/w command */
4182 ap->ops->exec_command(ap, &qc->tf);
4186 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
4187 * @qc: Info associated with this ATA transaction.
4190 * spin_lock_irqsave(host_set lock)
4193 static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
4195 struct ata_port *ap = qc->ap;
4196 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4199 /* start host DMA transaction */
4200 dmactl = readb(mmio + ATA_DMA_CMD);
4201 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
4203 /* Strictly, one may wish to issue a readb() here, to
4204 * flush the mmio write. However, control also passes
4205 * to the hardware at this point, and it will interrupt
4206 * us when we are to resume control. So, in effect,
4207 * we don't care when the mmio write flushes.
4208 * Further, a read of the DMA status register _immediately_
4209 * following the write may not be what certain flaky hardware
4210 * is expected, so I think it is best to not add a readb()
4211 * without first all the MMIO ATA cards/mobos.
4212 * Or maybe I'm just being paranoid.
4217 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
4218 * @qc: Info associated with this ATA transaction.
4221 * spin_lock_irqsave(host_set lock)
4224 static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
4226 struct ata_port *ap = qc->ap;
4227 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
4230 /* load PRD table addr. */
4231 outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
4233 /* specify data direction, triple-check start bit is clear */
4234 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4235 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
4237 dmactl |= ATA_DMA_WR;
4238 outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4240 /* issue r/w command */
4241 ap->ops->exec_command(ap, &qc->tf);
4245 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
4246 * @qc: Info associated with this ATA transaction.
4249 * spin_lock_irqsave(host_set lock)
4252 static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
4254 struct ata_port *ap = qc->ap;
4257 /* start host DMA transaction */
4258 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4259 outb(dmactl | ATA_DMA_START,
4260 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4265 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
4266 * @qc: Info associated with this ATA transaction.
4268 * Writes the ATA_DMA_START flag to the DMA command register.
4270 * May be used as the bmdma_start() entry in ata_port_operations.
4273 * spin_lock_irqsave(host_set lock)
4275 void ata_bmdma_start(struct ata_queued_cmd *qc)
4277 if (qc->ap->flags & ATA_FLAG_MMIO)
4278 ata_bmdma_start_mmio(qc);
4280 ata_bmdma_start_pio(qc);
4285 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
4286 * @qc: Info associated with this ATA transaction.
4288 * Writes address of PRD table to device's PRD Table Address
4289 * register, sets the DMA control register, and calls
4290 * ops->exec_command() to start the transfer.
4292 * May be used as the bmdma_setup() entry in ata_port_operations.
4295 * spin_lock_irqsave(host_set lock)
4297 void ata_bmdma_setup(struct ata_queued_cmd *qc)
4299 if (qc->ap->flags & ATA_FLAG_MMIO)
4300 ata_bmdma_setup_mmio(qc);
4302 ata_bmdma_setup_pio(qc);
4307 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
4308 * @ap: Port associated with this ATA transaction.
4310 * Clear interrupt and error flags in DMA status register.
4312 * May be used as the irq_clear() entry in ata_port_operations.
4315 * spin_lock_irqsave(host_set lock)
4318 void ata_bmdma_irq_clear(struct ata_port *ap)
4320 if (ap->flags & ATA_FLAG_MMIO) {
4321 void __iomem *mmio = ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
4322 writeb(readb(mmio), mmio);
4324 unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
4325 outb(inb(addr), addr);
4332 * ata_bmdma_status - Read PCI IDE BMDMA status
4333 * @ap: Port associated with this ATA transaction.
4335 * Read and return BMDMA status register.
4337 * May be used as the bmdma_status() entry in ata_port_operations.
4340 * spin_lock_irqsave(host_set lock)
4343 u8 ata_bmdma_status(struct ata_port *ap)
4346 if (ap->flags & ATA_FLAG_MMIO) {
4347 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4348 host_stat = readb(mmio + ATA_DMA_STATUS);
4350 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
4356 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4357 * @qc: Command we are ending DMA for
4359 * Clears the ATA_DMA_START flag in the dma control register
4361 * May be used as the bmdma_stop() entry in ata_port_operations.
4364 * spin_lock_irqsave(host_set lock)
4367 void ata_bmdma_stop(struct ata_queued_cmd *qc)
4369 struct ata_port *ap = qc->ap;
4370 if (ap->flags & ATA_FLAG_MMIO) {
4371 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4373 /* clear start/stop bit */
4374 writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
4375 mmio + ATA_DMA_CMD);
4377 /* clear start/stop bit */
4378 outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
4379 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4382 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4383 ata_altstatus(ap); /* dummy read */
4387 * ata_host_intr - Handle host interrupt for given (port, task)
4388 * @ap: Port on which interrupt arrived (possibly...)
4389 * @qc: Taskfile currently active in engine
4391 * Handle host interrupt for given queued command. Currently,
4392 * only DMA interrupts are handled. All other commands are
4393 * handled via polling with interrupts disabled (nIEN bit).
4396 * spin_lock_irqsave(host_set lock)
4399 * One if interrupt was handled, zero if not (shared irq).
4402 inline unsigned int ata_host_intr (struct ata_port *ap,
4403 struct ata_queued_cmd *qc)
4405 u8 status, host_stat;
4407 switch (qc->tf.protocol) {
4410 case ATA_PROT_ATAPI_DMA:
4411 case ATA_PROT_ATAPI:
4412 /* check status of DMA engine */
4413 host_stat = ap->ops->bmdma_status(ap);
4414 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4416 /* if it's not our irq... */
4417 if (!(host_stat & ATA_DMA_INTR))
4420 /* before we do anything else, clear DMA-Start bit */
4421 ap->ops->bmdma_stop(qc);
4425 case ATA_PROT_ATAPI_NODATA:
4426 case ATA_PROT_NODATA:
4427 /* check altstatus */
4428 status = ata_altstatus(ap);
4429 if (status & ATA_BUSY)
4432 /* check main status, clearing INTRQ */
4433 status = ata_chk_status(ap);
4434 if (unlikely(status & ATA_BUSY))
4436 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4437 ap->id, qc->tf.protocol, status);
4439 /* ack bmdma irq events */
4440 ap->ops->irq_clear(ap);
4442 /* complete taskfile transaction */
4443 qc->err_mask |= ac_err_mask(status);
4444 ata_qc_complete(qc);
4451 return 1; /* irq handled */
4454 ap->stats.idle_irq++;
4457 if ((ap->stats.idle_irq % 1000) == 0) {
4459 ata_irq_ack(ap, 0); /* debug trap */
4460 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4463 return 0; /* irq not handled */
4467 * ata_interrupt - Default ATA host interrupt handler
4468 * @irq: irq line (unused)
4469 * @dev_instance: pointer to our ata_host_set information structure
4472 * Default interrupt handler for PCI IDE devices. Calls
4473 * ata_host_intr() for each port that is not disabled.
4476 * Obtains host_set lock during operation.
4479 * IRQ_NONE or IRQ_HANDLED.
4482 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4484 struct ata_host_set *host_set = dev_instance;
4486 unsigned int handled = 0;
4487 unsigned long flags;
4489 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4490 spin_lock_irqsave(&host_set->lock, flags);
4492 for (i = 0; i < host_set->n_ports; i++) {
4493 struct ata_port *ap;
4495 ap = host_set->ports[i];
4497 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4498 struct ata_queued_cmd *qc;
4500 qc = ata_qc_from_tag(ap, ap->active_tag);
4501 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4502 (qc->flags & ATA_QCFLAG_ACTIVE))
4503 handled |= ata_host_intr(ap, qc);
4507 spin_unlock_irqrestore(&host_set->lock, flags);
4509 return IRQ_RETVAL(handled);
4513 * atapi_packet_task - Write CDB bytes to hardware
4514 * @_data: Port to which ATAPI device is attached.
4516 * When device has indicated its readiness to accept
4517 * a CDB, this function is called. Send the CDB.
4518 * If DMA is to be performed, exit immediately.
4519 * Otherwise, we are in polling mode, so poll
4520 * status under operation succeeds or fails.
4523 * Kernel thread context (may sleep)
4526 static void atapi_packet_task(void *_data)
4528 struct ata_port *ap = _data;
4529 struct ata_queued_cmd *qc;
4532 qc = ata_qc_from_tag(ap, ap->active_tag);
4534 assert(qc->flags & ATA_QCFLAG_ACTIVE);
4536 /* sleep-wait for BSY to clear */
4537 DPRINTK("busy wait\n");
4538 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
4539 qc->err_mask |= AC_ERR_TIMEOUT;
4543 /* make sure DRQ is set */
4544 status = ata_chk_status(ap);
4545 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
4546 qc->err_mask |= AC_ERR_HSM;
4551 DPRINTK("send cdb\n");
4552 assert(ap->cdb_len >= 12);
4554 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
4555 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
4556 unsigned long flags;
4558 /* Once we're done issuing command and kicking bmdma,
4559 * irq handler takes over. To not lose irq, we need
4560 * to clear NOINTR flag before sending cdb, but
4561 * interrupt handler shouldn't be invoked before we're
4562 * finished. Hence, the following locking.
4564 spin_lock_irqsave(&ap->host_set->lock, flags);
4565 ap->flags &= ~ATA_FLAG_NOINTR;
4566 ata_data_xfer(ap, qc->cdb, ap->cdb_len, 1);
4567 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
4568 ap->ops->bmdma_start(qc); /* initiate bmdma */
4569 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4571 ata_data_xfer(ap, qc->cdb, ap->cdb_len, 1);
4573 /* PIO commands are handled by polling */
4574 ap->hsm_task_state = HSM_ST;
4575 ata_queue_pio_task(ap);
4581 ata_poll_qc_complete(qc);
4586 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4587 * without filling any other registers
4589 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4592 struct ata_taskfile tf;
4595 ata_tf_init(ap, &tf, dev->devno);
4598 tf.flags |= ATA_TFLAG_DEVICE;
4599 tf.protocol = ATA_PROT_NODATA;
4601 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4603 printk(KERN_ERR "%s: ata command failed: %d\n",
4609 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4613 if (!ata_try_flush_cache(dev))
4616 if (ata_id_has_flush_ext(dev->id))
4617 cmd = ATA_CMD_FLUSH_EXT;
4619 cmd = ATA_CMD_FLUSH;
4621 return ata_do_simple_cmd(ap, dev, cmd);
4624 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4626 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4629 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4631 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4635 * ata_device_resume - wakeup a previously suspended devices
4636 * @ap: port the device is connected to
4637 * @dev: the device to resume
4639 * Kick the drive back into action, by sending it an idle immediate
4640 * command and making sure its transfer mode matches between drive
4644 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4646 if (ap->flags & ATA_FLAG_SUSPENDED) {
4647 ap->flags &= ~ATA_FLAG_SUSPENDED;
4650 if (!ata_dev_present(dev))
4652 if (dev->class == ATA_DEV_ATA)
4653 ata_start_drive(ap, dev);
4659 * ata_device_suspend - prepare a device for suspend
4660 * @ap: port the device is connected to
4661 * @dev: the device to suspend
4663 * Flush the cache on the drive, if appropriate, then issue a
4664 * standbynow command.
4666 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
4668 if (!ata_dev_present(dev))
4670 if (dev->class == ATA_DEV_ATA)
4671 ata_flush_cache(ap, dev);
4673 ata_standby_drive(ap, dev);
4674 ap->flags |= ATA_FLAG_SUSPENDED;
4679 * ata_port_start - Set port up for dma.
4680 * @ap: Port to initialize
4682 * Called just after data structures for each port are
4683 * initialized. Allocates space for PRD table.
4685 * May be used as the port_start() entry in ata_port_operations.
4688 * Inherited from caller.
4691 int ata_port_start (struct ata_port *ap)
4693 struct device *dev = ap->host_set->dev;
4696 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4700 rc = ata_pad_alloc(ap, dev);
4702 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4706 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4713 * ata_port_stop - Undo ata_port_start()
4714 * @ap: Port to shut down
4716 * Frees the PRD table.
4718 * May be used as the port_stop() entry in ata_port_operations.
4721 * Inherited from caller.
4724 void ata_port_stop (struct ata_port *ap)
4726 struct device *dev = ap->host_set->dev;
4728 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4729 ata_pad_free(ap, dev);
4732 void ata_host_stop (struct ata_host_set *host_set)
4734 if (host_set->mmio_base)
4735 iounmap(host_set->mmio_base);
4740 * ata_host_remove - Unregister SCSI host structure with upper layers
4741 * @ap: Port to unregister
4742 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4745 * Inherited from caller.
4748 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4750 struct Scsi_Host *sh = ap->host;
4755 scsi_remove_host(sh);
4757 ap->ops->port_stop(ap);
4761 * ata_host_init - Initialize an ata_port structure
4762 * @ap: Structure to initialize
4763 * @host: associated SCSI mid-layer structure
4764 * @host_set: Collection of hosts to which @ap belongs
4765 * @ent: Probe information provided by low-level driver
4766 * @port_no: Port number associated with this ata_port
4768 * Initialize a new ata_port structure, and its associated
4772 * Inherited from caller.
4775 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4776 struct ata_host_set *host_set,
4777 const struct ata_probe_ent *ent, unsigned int port_no)
4783 host->max_channel = 1;
4784 host->unique_id = ata_unique_id++;
4785 host->max_cmd_len = 12;
4787 ap->flags = ATA_FLAG_PORT_DISABLED;
4788 ap->id = host->unique_id;
4790 ap->ctl = ATA_DEVCTL_OBS;
4791 ap->host_set = host_set;
4792 ap->port_no = port_no;
4794 ent->legacy_mode ? ent->hard_port_no : port_no;
4795 ap->pio_mask = ent->pio_mask;
4796 ap->mwdma_mask = ent->mwdma_mask;
4797 ap->udma_mask = ent->udma_mask;
4798 ap->flags |= ent->host_flags;
4799 ap->ops = ent->port_ops;
4800 ap->cbl = ATA_CBL_NONE;
4801 ap->active_tag = ATA_TAG_POISON;
4802 ap->last_ctl = 0xFF;
4804 INIT_WORK(&ap->packet_task, atapi_packet_task, ap);
4805 INIT_WORK(&ap->pio_task, ata_pio_task, ap);
4806 INIT_LIST_HEAD(&ap->eh_done_q);
4808 for (i = 0; i < ATA_MAX_DEVICES; i++)
4809 ap->device[i].devno = i;
4812 ap->stats.unhandled_irq = 1;
4813 ap->stats.idle_irq = 1;
4816 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4820 * ata_host_add - Attach low-level ATA driver to system
4821 * @ent: Information provided by low-level driver
4822 * @host_set: Collections of ports to which we add
4823 * @port_no: Port number associated with this host
4825 * Attach low-level ATA driver to system.
4828 * PCI/etc. bus probe sem.
4831 * New ata_port on success, for NULL on error.
4834 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4835 struct ata_host_set *host_set,
4836 unsigned int port_no)
4838 struct Scsi_Host *host;
4839 struct ata_port *ap;
4843 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4847 ap = (struct ata_port *) &host->hostdata[0];
4849 ata_host_init(ap, host, host_set, ent, port_no);
4851 rc = ap->ops->port_start(ap);
4858 scsi_host_put(host);
4863 * ata_device_add - Register hardware device with ATA and SCSI layers
4864 * @ent: Probe information describing hardware device to be registered
4866 * This function processes the information provided in the probe
4867 * information struct @ent, allocates the necessary ATA and SCSI
4868 * host information structures, initializes them, and registers
4869 * everything with requisite kernel subsystems.
4871 * This function requests irqs, probes the ATA bus, and probes
4875 * PCI/etc. bus probe sem.
4878 * Number of ports registered. Zero on error (no ports registered).
4881 int ata_device_add(const struct ata_probe_ent *ent)
4883 unsigned int count = 0, i;
4884 struct device *dev = ent->dev;
4885 struct ata_host_set *host_set;
4888 /* alloc a container for our list of ATA ports (buses) */
4889 host_set = kzalloc(sizeof(struct ata_host_set) +
4890 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4893 spin_lock_init(&host_set->lock);
4895 host_set->dev = dev;
4896 host_set->n_ports = ent->n_ports;
4897 host_set->irq = ent->irq;
4898 host_set->mmio_base = ent->mmio_base;
4899 host_set->private_data = ent->private_data;
4900 host_set->ops = ent->port_ops;
4902 /* register each port bound to this device */
4903 for (i = 0; i < ent->n_ports; i++) {
4904 struct ata_port *ap;
4905 unsigned long xfer_mode_mask;
4907 ap = ata_host_add(ent, host_set, i);
4911 host_set->ports[i] = ap;
4912 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4913 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4914 (ap->pio_mask << ATA_SHIFT_PIO);
4916 /* print per-port info to dmesg */
4917 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4918 "bmdma 0x%lX irq %lu\n",
4920 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4921 ata_mode_string(xfer_mode_mask),
4922 ap->ioaddr.cmd_addr,
4923 ap->ioaddr.ctl_addr,
4924 ap->ioaddr.bmdma_addr,
4928 host_set->ops->irq_clear(ap);
4935 /* obtain irq, that is shared between channels */
4936 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4937 DRV_NAME, host_set))
4940 /* perform each probe synchronously */
4941 DPRINTK("probe begin\n");
4942 for (i = 0; i < count; i++) {
4943 struct ata_port *ap;
4946 ap = host_set->ports[i];
4948 DPRINTK("ata%u: bus probe begin\n", ap->id);
4949 rc = ata_bus_probe(ap);
4950 DPRINTK("ata%u: bus probe end\n", ap->id);
4953 /* FIXME: do something useful here?
4954 * Current libata behavior will
4955 * tear down everything when
4956 * the module is removed
4957 * or the h/w is unplugged.
4961 rc = scsi_add_host(ap->host, dev);
4963 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4965 /* FIXME: do something useful here */
4966 /* FIXME: handle unconditional calls to
4967 * scsi_scan_host and ata_host_remove, below,
4973 /* probes are done, now scan each port's disk(s) */
4974 DPRINTK("host probe begin\n");
4975 for (i = 0; i < count; i++) {
4976 struct ata_port *ap = host_set->ports[i];
4978 ata_scsi_scan_host(ap);
4981 dev_set_drvdata(dev, host_set);
4983 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4984 return ent->n_ports; /* success */
4987 for (i = 0; i < count; i++) {
4988 ata_host_remove(host_set->ports[i], 1);
4989 scsi_host_put(host_set->ports[i]->host);
4993 VPRINTK("EXIT, returning 0\n");
4998 * ata_host_set_remove - PCI layer callback for device removal
4999 * @host_set: ATA host set that was removed
5001 * Unregister all objects associated with this host set. Free those
5005 * Inherited from calling layer (may sleep).
5008 void ata_host_set_remove(struct ata_host_set *host_set)
5010 struct ata_port *ap;
5013 for (i = 0; i < host_set->n_ports; i++) {
5014 ap = host_set->ports[i];
5015 scsi_remove_host(ap->host);
5018 free_irq(host_set->irq, host_set);
5020 for (i = 0; i < host_set->n_ports; i++) {
5021 ap = host_set->ports[i];
5023 ata_scsi_release(ap->host);
5025 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
5026 struct ata_ioports *ioaddr = &ap->ioaddr;
5028 if (ioaddr->cmd_addr == 0x1f0)
5029 release_region(0x1f0, 8);
5030 else if (ioaddr->cmd_addr == 0x170)
5031 release_region(0x170, 8);
5034 scsi_host_put(ap->host);
5037 if (host_set->ops->host_stop)
5038 host_set->ops->host_stop(host_set);
5044 * ata_scsi_release - SCSI layer callback hook for host unload
5045 * @host: libata host to be unloaded
5047 * Performs all duties necessary to shut down a libata port...
5048 * Kill port kthread, disable port, and release resources.
5051 * Inherited from SCSI layer.
5057 int ata_scsi_release(struct Scsi_Host *host)
5059 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
5063 ap->ops->port_disable(ap);
5064 ata_host_remove(ap, 0);
5071 * ata_std_ports - initialize ioaddr with standard port offsets.
5072 * @ioaddr: IO address structure to be initialized
5074 * Utility function which initializes data_addr, error_addr,
5075 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5076 * device_addr, status_addr, and command_addr to standard offsets
5077 * relative to cmd_addr.
5079 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5082 void ata_std_ports(struct ata_ioports *ioaddr)
5084 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
5085 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
5086 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
5087 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
5088 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
5089 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
5090 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
5091 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
5092 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
5093 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
5096 static struct ata_probe_ent *
5097 ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
5099 struct ata_probe_ent *probe_ent;
5101 probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
5103 printk(KERN_ERR DRV_NAME "(%s): out of memory\n",
5104 kobject_name(&(dev->kobj)));
5108 INIT_LIST_HEAD(&probe_ent->node);
5109 probe_ent->dev = dev;
5111 probe_ent->sht = port->sht;
5112 probe_ent->host_flags = port->host_flags;
5113 probe_ent->pio_mask = port->pio_mask;
5114 probe_ent->mwdma_mask = port->mwdma_mask;
5115 probe_ent->udma_mask = port->udma_mask;
5116 probe_ent->port_ops = port->port_ops;
5125 void ata_pci_host_stop (struct ata_host_set *host_set)
5127 struct pci_dev *pdev = to_pci_dev(host_set->dev);
5129 pci_iounmap(pdev, host_set->mmio_base);
5133 * ata_pci_init_native_mode - Initialize native-mode driver
5134 * @pdev: pci device to be initialized
5135 * @port: array[2] of pointers to port info structures.
5136 * @ports: bitmap of ports present
5138 * Utility function which allocates and initializes an
5139 * ata_probe_ent structure for a standard dual-port
5140 * PIO-based IDE controller. The returned ata_probe_ent
5141 * structure can be passed to ata_device_add(). The returned
5142 * ata_probe_ent structure should then be freed with kfree().
5144 * The caller need only pass the address of the primary port, the
5145 * secondary will be deduced automatically. If the device has non
5146 * standard secondary port mappings this function can be called twice,
5147 * once for each interface.
5150 struct ata_probe_ent *
5151 ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int ports)
5153 struct ata_probe_ent *probe_ent =
5154 ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
5160 probe_ent->irq = pdev->irq;
5161 probe_ent->irq_flags = SA_SHIRQ;
5162 probe_ent->private_data = port[0]->private_data;
5164 if (ports & ATA_PORT_PRIMARY) {
5165 probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 0);
5166 probe_ent->port[p].altstatus_addr =
5167 probe_ent->port[p].ctl_addr =
5168 pci_resource_start(pdev, 1) | ATA_PCI_CTL_OFS;
5169 probe_ent->port[p].bmdma_addr = pci_resource_start(pdev, 4);
5170 ata_std_ports(&probe_ent->port[p]);
5174 if (ports & ATA_PORT_SECONDARY) {
5175 probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 2);
5176 probe_ent->port[p].altstatus_addr =
5177 probe_ent->port[p].ctl_addr =
5178 pci_resource_start(pdev, 3) | ATA_PCI_CTL_OFS;
5179 probe_ent->port[p].bmdma_addr = pci_resource_start(pdev, 4) + 8;
5180 ata_std_ports(&probe_ent->port[p]);
5184 probe_ent->n_ports = p;
5188 static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev, struct ata_port_info *port, int port_num)
5190 struct ata_probe_ent *probe_ent;
5192 probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port);
5196 probe_ent->legacy_mode = 1;
5197 probe_ent->n_ports = 1;
5198 probe_ent->hard_port_no = port_num;
5199 probe_ent->private_data = port->private_data;
5204 probe_ent->irq = 14;
5205 probe_ent->port[0].cmd_addr = 0x1f0;
5206 probe_ent->port[0].altstatus_addr =
5207 probe_ent->port[0].ctl_addr = 0x3f6;
5210 probe_ent->irq = 15;
5211 probe_ent->port[0].cmd_addr = 0x170;
5212 probe_ent->port[0].altstatus_addr =
5213 probe_ent->port[0].ctl_addr = 0x376;
5216 probe_ent->port[0].bmdma_addr = pci_resource_start(pdev, 4) + 8 * port_num;
5217 ata_std_ports(&probe_ent->port[0]);
5222 * ata_pci_init_one - Initialize/register PCI IDE host controller
5223 * @pdev: Controller to be initialized
5224 * @port_info: Information from low-level host driver
5225 * @n_ports: Number of ports attached to host controller
5227 * This is a helper function which can be called from a driver's
5228 * xxx_init_one() probe function if the hardware uses traditional
5229 * IDE taskfile registers.
5231 * This function calls pci_enable_device(), reserves its register
5232 * regions, sets the dma mask, enables bus master mode, and calls
5236 * Inherited from PCI layer (may sleep).
5239 * Zero on success, negative on errno-based value on error.
5242 int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
5243 unsigned int n_ports)
5245 struct ata_probe_ent *probe_ent = NULL, *probe_ent2 = NULL;
5246 struct ata_port_info *port[2];
5248 unsigned int legacy_mode = 0;
5249 int disable_dev_on_err = 1;
5254 port[0] = port_info[0];
5256 port[1] = port_info[1];
5260 if ((port[0]->host_flags & ATA_FLAG_NO_LEGACY) == 0
5261 && (pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
5262 /* TODO: What if one channel is in native mode ... */
5263 pci_read_config_byte(pdev, PCI_CLASS_PROG, &tmp8);
5264 mask = (1 << 2) | (1 << 0);
5265 if ((tmp8 & mask) != mask)
5266 legacy_mode = (1 << 3);
5270 if ((!legacy_mode) && (n_ports > 2)) {
5271 printk(KERN_ERR "ata: BUG: native mode, n_ports > 2\n");
5276 /* FIXME: Really for ATA it isn't safe because the device may be
5277 multi-purpose and we want to leave it alone if it was already
5278 enabled. Secondly for shared use as Arjan says we want refcounting
5280 Checking dev->is_enabled is insufficient as this is not set at
5281 boot for the primary video which is BIOS enabled
5284 rc = pci_enable_device(pdev);
5288 rc = pci_request_regions(pdev, DRV_NAME);
5290 disable_dev_on_err = 0;
5294 /* FIXME: Should use platform specific mappers for legacy port ranges */
5296 if (!request_region(0x1f0, 8, "libata")) {
5297 struct resource *conflict, res;
5299 res.end = 0x1f0 + 8 - 1;
5300 conflict = ____request_resource(&ioport_resource, &res);
5301 if (!strcmp(conflict->name, "libata"))
5302 legacy_mode |= (1 << 0);
5304 disable_dev_on_err = 0;
5305 printk(KERN_WARNING "ata: 0x1f0 IDE port busy\n");
5308 legacy_mode |= (1 << 0);
5310 if (!request_region(0x170, 8, "libata")) {
5311 struct resource *conflict, res;
5313 res.end = 0x170 + 8 - 1;
5314 conflict = ____request_resource(&ioport_resource, &res);
5315 if (!strcmp(conflict->name, "libata"))
5316 legacy_mode |= (1 << 1);
5318 disable_dev_on_err = 0;
5319 printk(KERN_WARNING "ata: 0x170 IDE port busy\n");
5322 legacy_mode |= (1 << 1);
5325 /* we have legacy mode, but all ports are unavailable */
5326 if (legacy_mode == (1 << 3)) {
5328 goto err_out_regions;
5331 rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
5333 goto err_out_regions;
5334 rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
5336 goto err_out_regions;
5339 if (legacy_mode & (1 << 0))
5340 probe_ent = ata_pci_init_legacy_port(pdev, port[0], 0);
5341 if (legacy_mode & (1 << 1))
5342 probe_ent2 = ata_pci_init_legacy_port(pdev, port[1], 1);
5345 probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
5347 probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY);
5349 if (!probe_ent && !probe_ent2) {
5351 goto err_out_regions;
5354 pci_set_master(pdev);
5356 /* FIXME: check ata_device_add return */
5358 if (legacy_mode & (1 << 0))
5359 ata_device_add(probe_ent);
5360 if (legacy_mode & (1 << 1))
5361 ata_device_add(probe_ent2);
5363 ata_device_add(probe_ent);
5371 if (legacy_mode & (1 << 0))
5372 release_region(0x1f0, 8);
5373 if (legacy_mode & (1 << 1))
5374 release_region(0x170, 8);
5375 pci_release_regions(pdev);
5377 if (disable_dev_on_err)
5378 pci_disable_device(pdev);
5383 * ata_pci_remove_one - PCI layer callback for device removal
5384 * @pdev: PCI device that was removed
5386 * PCI layer indicates to libata via this hook that
5387 * hot-unplug or module unload event has occurred.
5388 * Handle this by unregistering all objects associated
5389 * with this PCI device. Free those objects. Then finally
5390 * release PCI resources and disable device.
5393 * Inherited from PCI layer (may sleep).
5396 void ata_pci_remove_one (struct pci_dev *pdev)
5398 struct device *dev = pci_dev_to_dev(pdev);
5399 struct ata_host_set *host_set = dev_get_drvdata(dev);
5401 ata_host_set_remove(host_set);
5402 pci_release_regions(pdev);
5403 pci_disable_device(pdev);
5404 dev_set_drvdata(dev, NULL);
5407 /* move to PCI subsystem */
5408 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
5410 unsigned long tmp = 0;
5412 switch (bits->width) {
5415 pci_read_config_byte(pdev, bits->reg, &tmp8);
5421 pci_read_config_word(pdev, bits->reg, &tmp16);
5427 pci_read_config_dword(pdev, bits->reg, &tmp32);
5438 return (tmp == bits->val) ? 1 : 0;
5441 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
5443 pci_save_state(pdev);
5444 pci_disable_device(pdev);
5445 pci_set_power_state(pdev, PCI_D3hot);
5449 int ata_pci_device_resume(struct pci_dev *pdev)
5451 pci_set_power_state(pdev, PCI_D0);
5452 pci_restore_state(pdev);
5453 pci_enable_device(pdev);
5454 pci_set_master(pdev);
5457 #endif /* CONFIG_PCI */
5460 static int __init ata_init(void)
5462 ata_wq = create_workqueue("ata");
5466 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5470 static void __exit ata_exit(void)
5472 destroy_workqueue(ata_wq);
5475 module_init(ata_init);
5476 module_exit(ata_exit);
5478 static unsigned long ratelimit_time;
5479 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5481 int ata_ratelimit(void)
5484 unsigned long flags;
5486 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5488 if (time_after(jiffies, ratelimit_time)) {
5490 ratelimit_time = jiffies + (HZ/5);
5494 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5500 * libata is essentially a library of internal helper functions for
5501 * low-level ATA host controller drivers. As such, the API/ABI is
5502 * likely to change as new drivers are added and updated.
5503 * Do not depend on ABI/API stability.
5506 EXPORT_SYMBOL_GPL(ata_std_bios_param);
5507 EXPORT_SYMBOL_GPL(ata_std_ports);
5508 EXPORT_SYMBOL_GPL(ata_device_add);
5509 EXPORT_SYMBOL_GPL(ata_host_set_remove);
5510 EXPORT_SYMBOL_GPL(ata_sg_init);
5511 EXPORT_SYMBOL_GPL(ata_sg_init_one);
5512 EXPORT_SYMBOL_GPL(ata_qc_complete);
5513 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
5514 EXPORT_SYMBOL_GPL(ata_eng_timeout);
5515 EXPORT_SYMBOL_GPL(ata_tf_load);
5516 EXPORT_SYMBOL_GPL(ata_tf_read);
5517 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5518 EXPORT_SYMBOL_GPL(ata_std_dev_select);
5519 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5520 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5521 EXPORT_SYMBOL_GPL(ata_check_status);
5522 EXPORT_SYMBOL_GPL(ata_altstatus);
5523 EXPORT_SYMBOL_GPL(ata_exec_command);
5524 EXPORT_SYMBOL_GPL(ata_port_start);
5525 EXPORT_SYMBOL_GPL(ata_port_stop);
5526 EXPORT_SYMBOL_GPL(ata_host_stop);
5527 EXPORT_SYMBOL_GPL(ata_interrupt);
5528 EXPORT_SYMBOL_GPL(ata_qc_prep);
5529 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5530 EXPORT_SYMBOL_GPL(ata_bmdma_start);
5531 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5532 EXPORT_SYMBOL_GPL(ata_bmdma_status);
5533 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5534 EXPORT_SYMBOL_GPL(ata_port_probe);
5535 EXPORT_SYMBOL_GPL(sata_phy_reset);
5536 EXPORT_SYMBOL_GPL(__sata_phy_reset);
5537 EXPORT_SYMBOL_GPL(ata_bus_reset);
5538 EXPORT_SYMBOL_GPL(ata_std_softreset);
5539 EXPORT_SYMBOL_GPL(sata_std_hardreset);
5540 EXPORT_SYMBOL_GPL(ata_std_postreset);
5541 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5542 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5543 EXPORT_SYMBOL_GPL(ata_port_disable);
5544 EXPORT_SYMBOL_GPL(ata_ratelimit);
5545 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5546 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5547 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5548 EXPORT_SYMBOL_GPL(ata_scsi_error);
5549 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5550 EXPORT_SYMBOL_GPL(ata_scsi_release);
5551 EXPORT_SYMBOL_GPL(ata_host_intr);
5552 EXPORT_SYMBOL_GPL(ata_dev_classify);
5553 EXPORT_SYMBOL_GPL(ata_dev_id_string);
5554 EXPORT_SYMBOL_GPL(ata_dev_config);
5555 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5556 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5557 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
5559 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5560 EXPORT_SYMBOL_GPL(ata_timing_compute);
5561 EXPORT_SYMBOL_GPL(ata_timing_merge);
5564 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5565 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5566 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5567 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5568 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5569 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5570 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5571 #endif /* CONFIG_PCI */
5573 EXPORT_SYMBOL_GPL(ata_device_suspend);
5574 EXPORT_SYMBOL_GPL(ata_device_resume);
5575 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5576 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);