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 unsigned int ata_dev_init_params(struct ata_device *dev,
65 u16 heads, u16 sectors);
66 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
67 static void ata_dev_xfermask(struct ata_device *dev);
69 static unsigned int ata_unique_id = 1;
70 static struct workqueue_struct *ata_wq;
72 int atapi_enabled = 1;
73 module_param(atapi_enabled, int, 0444);
74 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
77 module_param(atapi_dmadir, int, 0444);
78 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
81 module_param_named(fua, libata_fua, int, 0444);
82 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
84 MODULE_AUTHOR("Jeff Garzik");
85 MODULE_DESCRIPTION("Library module for ATA devices");
86 MODULE_LICENSE("GPL");
87 MODULE_VERSION(DRV_VERSION);
91 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
92 * @tf: Taskfile to convert
93 * @fis: Buffer into which data will output
94 * @pmp: Port multiplier port
96 * Converts a standard ATA taskfile to a Serial ATA
97 * FIS structure (Register - Host to Device).
100 * Inherited from caller.
103 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
105 fis[0] = 0x27; /* Register - Host to Device FIS */
106 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
107 bit 7 indicates Command FIS */
108 fis[2] = tf->command;
109 fis[3] = tf->feature;
116 fis[8] = tf->hob_lbal;
117 fis[9] = tf->hob_lbam;
118 fis[10] = tf->hob_lbah;
119 fis[11] = tf->hob_feature;
122 fis[13] = tf->hob_nsect;
133 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
134 * @fis: Buffer from which data will be input
135 * @tf: Taskfile to output
137 * Converts a serial ATA FIS structure to a standard ATA taskfile.
140 * Inherited from caller.
143 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
145 tf->command = fis[2]; /* status */
146 tf->feature = fis[3]; /* error */
153 tf->hob_lbal = fis[8];
154 tf->hob_lbam = fis[9];
155 tf->hob_lbah = fis[10];
158 tf->hob_nsect = fis[13];
161 static const u8 ata_rw_cmds[] = {
165 ATA_CMD_READ_MULTI_EXT,
166 ATA_CMD_WRITE_MULTI_EXT,
170 ATA_CMD_WRITE_MULTI_FUA_EXT,
174 ATA_CMD_PIO_READ_EXT,
175 ATA_CMD_PIO_WRITE_EXT,
188 ATA_CMD_WRITE_FUA_EXT
192 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
193 * @qc: command to examine and configure
195 * Examine the device configuration and tf->flags to calculate
196 * the proper read/write commands and protocol to use.
201 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
203 struct ata_taskfile *tf = &qc->tf;
204 struct ata_device *dev = qc->dev;
207 int index, fua, lba48, write;
209 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
210 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
211 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
213 if (dev->flags & ATA_DFLAG_PIO) {
214 tf->protocol = ATA_PROT_PIO;
215 index = dev->multi_count ? 0 : 8;
216 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
217 /* Unable to use DMA due to host limitation */
218 tf->protocol = ATA_PROT_PIO;
219 index = dev->multi_count ? 0 : 8;
221 tf->protocol = ATA_PROT_DMA;
225 cmd = ata_rw_cmds[index + fua + lba48 + write];
234 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
235 * @pio_mask: pio_mask
236 * @mwdma_mask: mwdma_mask
237 * @udma_mask: udma_mask
239 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
240 * unsigned int xfer_mask.
248 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
249 unsigned int mwdma_mask,
250 unsigned int udma_mask)
252 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
253 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
254 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
258 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
259 * @xfer_mask: xfer_mask to unpack
260 * @pio_mask: resulting pio_mask
261 * @mwdma_mask: resulting mwdma_mask
262 * @udma_mask: resulting udma_mask
264 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
265 * Any NULL distination masks will be ignored.
267 static void ata_unpack_xfermask(unsigned int xfer_mask,
268 unsigned int *pio_mask,
269 unsigned int *mwdma_mask,
270 unsigned int *udma_mask)
273 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
275 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
277 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
280 static const struct ata_xfer_ent {
284 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
285 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
286 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
291 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
292 * @xfer_mask: xfer_mask of interest
294 * Return matching XFER_* value for @xfer_mask. Only the highest
295 * bit of @xfer_mask is considered.
301 * Matching XFER_* value, 0 if no match found.
303 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
305 int highbit = fls(xfer_mask) - 1;
306 const struct ata_xfer_ent *ent;
308 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
309 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
310 return ent->base + highbit - ent->shift;
315 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
316 * @xfer_mode: XFER_* of interest
318 * Return matching xfer_mask for @xfer_mode.
324 * Matching xfer_mask, 0 if no match found.
326 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
328 const struct ata_xfer_ent *ent;
330 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
331 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
332 return 1 << (ent->shift + xfer_mode - ent->base);
337 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
338 * @xfer_mode: XFER_* of interest
340 * Return matching xfer_shift for @xfer_mode.
346 * Matching xfer_shift, -1 if no match found.
348 static int ata_xfer_mode2shift(unsigned int xfer_mode)
350 const struct ata_xfer_ent *ent;
352 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
353 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
359 * ata_mode_string - convert xfer_mask to string
360 * @xfer_mask: mask of bits supported; only highest bit counts.
362 * Determine string which represents the highest speed
363 * (highest bit in @modemask).
369 * Constant C string representing highest speed listed in
370 * @mode_mask, or the constant C string "<n/a>".
372 static const char *ata_mode_string(unsigned int xfer_mask)
374 static const char * const xfer_mode_str[] = {
394 highbit = fls(xfer_mask) - 1;
395 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
396 return xfer_mode_str[highbit];
400 static const char *sata_spd_string(unsigned int spd)
402 static const char * const spd_str[] = {
407 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
409 return spd_str[spd - 1];
412 void ata_dev_disable(struct ata_device *dev)
414 if (ata_dev_enabled(dev)) {
415 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
421 * ata_pio_devchk - PATA device presence detection
422 * @ap: ATA channel to examine
423 * @device: Device to examine (starting at zero)
425 * This technique was originally described in
426 * Hale Landis's ATADRVR (www.ata-atapi.com), and
427 * later found its way into the ATA/ATAPI spec.
429 * Write a pattern to the ATA shadow registers,
430 * and if a device is present, it will respond by
431 * correctly storing and echoing back the
432 * ATA shadow register contents.
438 static unsigned int ata_pio_devchk(struct ata_port *ap,
441 struct ata_ioports *ioaddr = &ap->ioaddr;
444 ap->ops->dev_select(ap, device);
446 outb(0x55, ioaddr->nsect_addr);
447 outb(0xaa, ioaddr->lbal_addr);
449 outb(0xaa, ioaddr->nsect_addr);
450 outb(0x55, ioaddr->lbal_addr);
452 outb(0x55, ioaddr->nsect_addr);
453 outb(0xaa, ioaddr->lbal_addr);
455 nsect = inb(ioaddr->nsect_addr);
456 lbal = inb(ioaddr->lbal_addr);
458 if ((nsect == 0x55) && (lbal == 0xaa))
459 return 1; /* we found a device */
461 return 0; /* nothing found */
465 * ata_mmio_devchk - PATA device presence detection
466 * @ap: ATA channel to examine
467 * @device: Device to examine (starting at zero)
469 * This technique was originally described in
470 * Hale Landis's ATADRVR (www.ata-atapi.com), and
471 * later found its way into the ATA/ATAPI spec.
473 * Write a pattern to the ATA shadow registers,
474 * and if a device is present, it will respond by
475 * correctly storing and echoing back the
476 * ATA shadow register contents.
482 static unsigned int ata_mmio_devchk(struct ata_port *ap,
485 struct ata_ioports *ioaddr = &ap->ioaddr;
488 ap->ops->dev_select(ap, device);
490 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
491 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
493 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
494 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
496 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
497 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
499 nsect = readb((void __iomem *) ioaddr->nsect_addr);
500 lbal = readb((void __iomem *) ioaddr->lbal_addr);
502 if ((nsect == 0x55) && (lbal == 0xaa))
503 return 1; /* we found a device */
505 return 0; /* nothing found */
509 * ata_devchk - PATA device presence detection
510 * @ap: ATA channel to examine
511 * @device: Device to examine (starting at zero)
513 * Dispatch ATA device presence detection, depending
514 * on whether we are using PIO or MMIO to talk to the
515 * ATA shadow registers.
521 static unsigned int ata_devchk(struct ata_port *ap,
524 if (ap->flags & ATA_FLAG_MMIO)
525 return ata_mmio_devchk(ap, device);
526 return ata_pio_devchk(ap, device);
530 * ata_dev_classify - determine device type based on ATA-spec signature
531 * @tf: ATA taskfile register set for device to be identified
533 * Determine from taskfile register contents whether a device is
534 * ATA or ATAPI, as per "Signature and persistence" section
535 * of ATA/PI spec (volume 1, sect 5.14).
541 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
542 * the event of failure.
545 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
547 /* Apple's open source Darwin code hints that some devices only
548 * put a proper signature into the LBA mid/high registers,
549 * So, we only check those. It's sufficient for uniqueness.
552 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
553 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
554 DPRINTK("found ATA device by sig\n");
558 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
559 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
560 DPRINTK("found ATAPI device by sig\n");
561 return ATA_DEV_ATAPI;
564 DPRINTK("unknown device\n");
565 return ATA_DEV_UNKNOWN;
569 * ata_dev_try_classify - Parse returned ATA device signature
570 * @ap: ATA channel to examine
571 * @device: Device to examine (starting at zero)
572 * @r_err: Value of error register on completion
574 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
575 * an ATA/ATAPI-defined set of values is placed in the ATA
576 * shadow registers, indicating the results of device detection
579 * Select the ATA device, and read the values from the ATA shadow
580 * registers. Then parse according to the Error register value,
581 * and the spec-defined values examined by ata_dev_classify().
587 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
591 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
593 struct ata_taskfile tf;
597 ap->ops->dev_select(ap, device);
599 memset(&tf, 0, sizeof(tf));
601 ap->ops->tf_read(ap, &tf);
606 /* see if device passed diags */
609 else if ((device == 0) && (err == 0x81))
614 /* determine if device is ATA or ATAPI */
615 class = ata_dev_classify(&tf);
617 if (class == ATA_DEV_UNKNOWN)
619 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
625 * ata_id_string - Convert IDENTIFY DEVICE page into string
626 * @id: IDENTIFY DEVICE results we will examine
627 * @s: string into which data is output
628 * @ofs: offset into identify device page
629 * @len: length of string to return. must be an even number.
631 * The strings in the IDENTIFY DEVICE page are broken up into
632 * 16-bit chunks. Run through the string, and output each
633 * 8-bit chunk linearly, regardless of platform.
639 void ata_id_string(const u16 *id, unsigned char *s,
640 unsigned int ofs, unsigned int len)
659 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
660 * @id: IDENTIFY DEVICE results we will examine
661 * @s: string into which data is output
662 * @ofs: offset into identify device page
663 * @len: length of string to return. must be an odd number.
665 * This function is identical to ata_id_string except that it
666 * trims trailing spaces and terminates the resulting string with
667 * null. @len must be actual maximum length (even number) + 1.
672 void ata_id_c_string(const u16 *id, unsigned char *s,
673 unsigned int ofs, unsigned int len)
679 ata_id_string(id, s, ofs, len - 1);
681 p = s + strnlen(s, len - 1);
682 while (p > s && p[-1] == ' ')
687 static u64 ata_id_n_sectors(const u16 *id)
689 if (ata_id_has_lba(id)) {
690 if (ata_id_has_lba48(id))
691 return ata_id_u64(id, 100);
693 return ata_id_u32(id, 60);
695 if (ata_id_current_chs_valid(id))
696 return ata_id_u32(id, 57);
698 return id[1] * id[3] * id[6];
703 * ata_noop_dev_select - Select device 0/1 on ATA bus
704 * @ap: ATA channel to manipulate
705 * @device: ATA device (numbered from zero) to select
707 * This function performs no actual function.
709 * May be used as the dev_select() entry in ata_port_operations.
714 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
720 * ata_std_dev_select - Select device 0/1 on ATA bus
721 * @ap: ATA channel to manipulate
722 * @device: ATA device (numbered from zero) to select
724 * Use the method defined in the ATA specification to
725 * make either device 0, or device 1, active on the
726 * ATA channel. Works with both PIO and MMIO.
728 * May be used as the dev_select() entry in ata_port_operations.
734 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
739 tmp = ATA_DEVICE_OBS;
741 tmp = ATA_DEVICE_OBS | ATA_DEV1;
743 if (ap->flags & ATA_FLAG_MMIO) {
744 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
746 outb(tmp, ap->ioaddr.device_addr);
748 ata_pause(ap); /* needed; also flushes, for mmio */
752 * ata_dev_select - Select device 0/1 on ATA bus
753 * @ap: ATA channel to manipulate
754 * @device: ATA device (numbered from zero) to select
755 * @wait: non-zero to wait for Status register BSY bit to clear
756 * @can_sleep: non-zero if context allows sleeping
758 * Use the method defined in the ATA specification to
759 * make either device 0, or device 1, active on the
762 * This is a high-level version of ata_std_dev_select(),
763 * which additionally provides the services of inserting
764 * the proper pauses and status polling, where needed.
770 void ata_dev_select(struct ata_port *ap, unsigned int device,
771 unsigned int wait, unsigned int can_sleep)
773 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
774 ap->id, device, wait);
779 ap->ops->dev_select(ap, device);
782 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
789 * ata_dump_id - IDENTIFY DEVICE info debugging output
790 * @id: IDENTIFY DEVICE page to dump
792 * Dump selected 16-bit words from the given IDENTIFY DEVICE
799 static inline void ata_dump_id(const u16 *id)
801 DPRINTK("49==0x%04x "
811 DPRINTK("80==0x%04x "
821 DPRINTK("88==0x%04x "
828 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
829 * @id: IDENTIFY data to compute xfer mask from
831 * Compute the xfermask for this device. This is not as trivial
832 * as it seems if we must consider early devices correctly.
834 * FIXME: pre IDE drive timing (do we care ?).
842 static unsigned int ata_id_xfermask(const u16 *id)
844 unsigned int pio_mask, mwdma_mask, udma_mask;
846 /* Usual case. Word 53 indicates word 64 is valid */
847 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
848 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
852 /* If word 64 isn't valid then Word 51 high byte holds
853 * the PIO timing number for the maximum. Turn it into
856 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
858 /* But wait.. there's more. Design your standards by
859 * committee and you too can get a free iordy field to
860 * process. However its the speeds not the modes that
861 * are supported... Note drivers using the timing API
862 * will get this right anyway
866 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
869 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
870 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
872 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
876 * ata_port_queue_task - Queue port_task
877 * @ap: The ata_port to queue port_task for
879 * Schedule @fn(@data) for execution after @delay jiffies using
880 * port_task. There is one port_task per port and it's the
881 * user(low level driver)'s responsibility to make sure that only
882 * one task is active at any given time.
884 * libata core layer takes care of synchronization between
885 * port_task and EH. ata_port_queue_task() may be ignored for EH
889 * Inherited from caller.
891 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
896 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
899 PREPARE_WORK(&ap->port_task, fn, data);
902 rc = queue_work(ata_wq, &ap->port_task);
904 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
906 /* rc == 0 means that another user is using port task */
911 * ata_port_flush_task - Flush port_task
912 * @ap: The ata_port to flush port_task for
914 * After this function completes, port_task is guranteed not to
915 * be running or scheduled.
918 * Kernel thread context (may sleep)
920 void ata_port_flush_task(struct ata_port *ap)
926 spin_lock_irqsave(&ap->host_set->lock, flags);
927 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
928 spin_unlock_irqrestore(&ap->host_set->lock, flags);
930 DPRINTK("flush #1\n");
931 flush_workqueue(ata_wq);
934 * At this point, if a task is running, it's guaranteed to see
935 * the FLUSH flag; thus, it will never queue pio tasks again.
938 if (!cancel_delayed_work(&ap->port_task)) {
939 DPRINTK("flush #2\n");
940 flush_workqueue(ata_wq);
943 spin_lock_irqsave(&ap->host_set->lock, flags);
944 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
945 spin_unlock_irqrestore(&ap->host_set->lock, flags);
950 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
952 struct completion *waiting = qc->private_data;
958 * ata_exec_internal - execute libata internal command
959 * @dev: Device to which the command is sent
960 * @tf: Taskfile registers for the command and the result
961 * @cdb: CDB for packet command
962 * @dma_dir: Data tranfer direction of the command
963 * @buf: Data buffer of the command
964 * @buflen: Length of data buffer
966 * Executes libata internal command with timeout. @tf contains
967 * command on entry and result on return. Timeout and error
968 * conditions are reported via return value. No recovery action
969 * is taken after a command times out. It's caller's duty to
970 * clean up after timeout.
973 * None. Should be called with kernel context, might sleep.
976 unsigned ata_exec_internal(struct ata_device *dev,
977 struct ata_taskfile *tf, const u8 *cdb,
978 int dma_dir, void *buf, unsigned int buflen)
980 struct ata_port *ap = dev->ap;
981 u8 command = tf->command;
982 struct ata_queued_cmd *qc;
983 unsigned int tag, preempted_tag;
984 DECLARE_COMPLETION(wait);
986 unsigned int err_mask;
988 spin_lock_irqsave(&ap->host_set->lock, flags);
990 /* no internal command while frozen */
991 if (ap->flags & ATA_FLAG_FROZEN) {
992 spin_unlock_irqrestore(&ap->host_set->lock, flags);
993 return AC_ERR_SYSTEM;
996 /* initialize internal qc */
998 /* XXX: Tag 0 is used for drivers with legacy EH as some
999 * drivers choke if any other tag is given. This breaks
1000 * ata_tag_internal() test for those drivers. Don't use new
1001 * EH stuff without converting to it.
1003 if (ap->ops->error_handler)
1004 tag = ATA_TAG_INTERNAL;
1008 if (test_and_set_bit(tag, &ap->qactive))
1010 qc = __ata_qc_from_tag(ap, tag);
1018 preempted_tag = ap->active_tag;
1019 ap->active_tag = ATA_TAG_POISON;
1021 /* prepare & issue qc */
1024 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1025 qc->flags |= ATA_QCFLAG_RESULT_TF;
1026 qc->dma_dir = dma_dir;
1027 if (dma_dir != DMA_NONE) {
1028 ata_sg_init_one(qc, buf, buflen);
1029 qc->nsect = buflen / ATA_SECT_SIZE;
1032 qc->private_data = &wait;
1033 qc->complete_fn = ata_qc_complete_internal;
1037 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1039 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
1040 ata_port_flush_task(ap);
1042 spin_lock_irqsave(&ap->host_set->lock, flags);
1044 /* We're racing with irq here. If we lose, the
1045 * following test prevents us from completing the qc
1046 * again. If completion irq occurs after here but
1047 * before the caller cleans up, it will result in a
1048 * spurious interrupt. We can live with that.
1050 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1051 qc->err_mask = AC_ERR_TIMEOUT;
1052 ata_qc_complete(qc);
1054 ata_dev_printk(dev, KERN_WARNING,
1055 "qc timeout (cmd 0x%x)\n", command);
1058 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1062 spin_lock_irqsave(&ap->host_set->lock, flags);
1064 *tf = qc->result_tf;
1065 err_mask = qc->err_mask;
1068 ap->active_tag = preempted_tag;
1070 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1071 * Until those drivers are fixed, we detect the condition
1072 * here, fail the command with AC_ERR_SYSTEM and reenable the
1075 * Note that this doesn't change any behavior as internal
1076 * command failure results in disabling the device in the
1077 * higher layer for LLDDs without new reset/EH callbacks.
1079 * Kill the following code as soon as those drivers are fixed.
1081 if (ap->flags & ATA_FLAG_DISABLED) {
1082 err_mask |= AC_ERR_SYSTEM;
1086 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1092 * ata_pio_need_iordy - check if iordy needed
1095 * Check if the current speed of the device requires IORDY. Used
1096 * by various controllers for chip configuration.
1099 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1102 int speed = adev->pio_mode - XFER_PIO_0;
1109 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1111 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1112 pio = adev->id[ATA_ID_EIDE_PIO];
1113 /* Is the speed faster than the drive allows non IORDY ? */
1115 /* This is cycle times not frequency - watch the logic! */
1116 if (pio > 240) /* PIO2 is 240nS per cycle */
1125 * ata_dev_read_id - Read ID data from the specified device
1126 * @dev: target device
1127 * @p_class: pointer to class of the target device (may be changed)
1128 * @post_reset: is this read ID post-reset?
1129 * @id: buffer to read IDENTIFY data into
1131 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1132 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1133 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1134 * for pre-ATA4 drives.
1137 * Kernel thread context (may sleep)
1140 * 0 on success, -errno otherwise.
1142 static int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1143 int post_reset, u16 *id)
1145 struct ata_port *ap = dev->ap;
1146 unsigned int class = *p_class;
1147 struct ata_taskfile tf;
1148 unsigned int err_mask = 0;
1152 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1154 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1157 ata_tf_init(dev, &tf);
1161 tf.command = ATA_CMD_ID_ATA;
1164 tf.command = ATA_CMD_ID_ATAPI;
1168 reason = "unsupported class";
1172 tf.protocol = ATA_PROT_PIO;
1174 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1175 id, sizeof(id[0]) * ATA_ID_WORDS);
1178 reason = "I/O error";
1182 swap_buf_le16(id, ATA_ID_WORDS);
1185 if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
1187 reason = "device reports illegal type";
1191 if (post_reset && class == ATA_DEV_ATA) {
1193 * The exact sequence expected by certain pre-ATA4 drives is:
1196 * INITIALIZE DEVICE PARAMETERS
1198 * Some drives were very specific about that exact sequence.
1200 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1201 err_mask = ata_dev_init_params(dev, id[3], id[6]);
1204 reason = "INIT_DEV_PARAMS failed";
1208 /* current CHS translation info (id[53-58]) might be
1209 * changed. reread the identify device info.
1221 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
1222 "(%s, err_mask=0x%x)\n", reason, err_mask);
1226 static inline u8 ata_dev_knobble(struct ata_device *dev)
1228 return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1232 * ata_dev_configure - Configure the specified ATA/ATAPI device
1233 * @dev: Target device to configure
1234 * @print_info: Enable device info printout
1236 * Configure @dev according to @dev->id. Generic and low-level
1237 * driver specific fixups are also applied.
1240 * Kernel thread context (may sleep)
1243 * 0 on success, -errno otherwise
1245 static int ata_dev_configure(struct ata_device *dev, int print_info)
1247 struct ata_port *ap = dev->ap;
1248 const u16 *id = dev->id;
1249 unsigned int xfer_mask;
1252 if (!ata_dev_enabled(dev)) {
1253 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1254 ap->id, dev->devno);
1258 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1260 /* print device capabilities */
1262 ata_dev_printk(dev, KERN_DEBUG, "cfg 49:%04x 82:%04x 83:%04x "
1263 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1264 id[49], id[82], id[83], id[84],
1265 id[85], id[86], id[87], id[88]);
1267 /* initialize to-be-configured parameters */
1268 dev->flags &= ~ATA_DFLAG_CFG_MASK;
1269 dev->max_sectors = 0;
1277 * common ATA, ATAPI feature tests
1280 /* find max transfer mode; for printk only */
1281 xfer_mask = ata_id_xfermask(id);
1285 /* ATA-specific feature tests */
1286 if (dev->class == ATA_DEV_ATA) {
1287 dev->n_sectors = ata_id_n_sectors(id);
1289 if (ata_id_has_lba(id)) {
1290 const char *lba_desc;
1293 dev->flags |= ATA_DFLAG_LBA;
1294 if (ata_id_has_lba48(id)) {
1295 dev->flags |= ATA_DFLAG_LBA48;
1299 /* print device info to dmesg */
1301 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
1302 "max %s, %Lu sectors: %s\n",
1303 ata_id_major_version(id),
1304 ata_mode_string(xfer_mask),
1305 (unsigned long long)dev->n_sectors,
1310 /* Default translation */
1311 dev->cylinders = id[1];
1313 dev->sectors = id[6];
1315 if (ata_id_current_chs_valid(id)) {
1316 /* Current CHS translation is valid. */
1317 dev->cylinders = id[54];
1318 dev->heads = id[55];
1319 dev->sectors = id[56];
1322 /* print device info to dmesg */
1324 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
1325 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1326 ata_id_major_version(id),
1327 ata_mode_string(xfer_mask),
1328 (unsigned long long)dev->n_sectors,
1329 dev->cylinders, dev->heads, dev->sectors);
1335 /* ATAPI-specific feature tests */
1336 else if (dev->class == ATA_DEV_ATAPI) {
1337 rc = atapi_cdb_len(id);
1338 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1339 ata_dev_printk(dev, KERN_WARNING,
1340 "unsupported CDB len\n");
1344 dev->cdb_len = (unsigned int) rc;
1346 /* print device info to dmesg */
1348 ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s\n",
1349 ata_mode_string(xfer_mask));
1352 ap->host->max_cmd_len = 0;
1353 for (i = 0; i < ATA_MAX_DEVICES; i++)
1354 ap->host->max_cmd_len = max_t(unsigned int,
1355 ap->host->max_cmd_len,
1356 ap->device[i].cdb_len);
1358 /* limit bridge transfers to udma5, 200 sectors */
1359 if (ata_dev_knobble(dev)) {
1361 ata_dev_printk(dev, KERN_INFO,
1362 "applying bridge limits\n");
1363 dev->udma_mask &= ATA_UDMA5;
1364 dev->max_sectors = ATA_MAX_SECTORS;
1367 if (ap->ops->dev_config)
1368 ap->ops->dev_config(ap, dev);
1370 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1374 DPRINTK("EXIT, err\n");
1379 * ata_bus_probe - Reset and probe ATA bus
1382 * Master ATA bus probing function. Initiates a hardware-dependent
1383 * bus reset, then attempts to identify any devices found on
1387 * PCI/etc. bus probe sem.
1390 * Zero on success, negative errno otherwise.
1393 static int ata_bus_probe(struct ata_port *ap)
1395 unsigned int classes[ATA_MAX_DEVICES];
1396 int tries[ATA_MAX_DEVICES];
1397 int i, rc, down_xfermask;
1398 struct ata_device *dev;
1402 for (i = 0; i < ATA_MAX_DEVICES; i++)
1403 tries[i] = ATA_PROBE_MAX_TRIES;
1408 /* reset and determine device classes */
1409 for (i = 0; i < ATA_MAX_DEVICES; i++)
1410 classes[i] = ATA_DEV_UNKNOWN;
1412 if (ap->ops->probe_reset) {
1413 rc = ap->ops->probe_reset(ap, classes);
1415 ata_port_printk(ap, KERN_ERR,
1416 "reset failed (errno=%d)\n", rc);
1420 ap->ops->phy_reset(ap);
1422 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1423 if (!(ap->flags & ATA_FLAG_DISABLED))
1424 classes[i] = ap->device[i].class;
1425 ap->device[i].class = ATA_DEV_UNKNOWN;
1431 for (i = 0; i < ATA_MAX_DEVICES; i++)
1432 if (classes[i] == ATA_DEV_UNKNOWN)
1433 classes[i] = ATA_DEV_NONE;
1435 /* read IDENTIFY page and configure devices */
1436 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1437 dev = &ap->device[i];
1440 dev->class = classes[i];
1442 if (!ata_dev_enabled(dev))
1445 rc = ata_dev_read_id(dev, &dev->class, 1, dev->id);
1449 rc = ata_dev_configure(dev, 1);
1454 /* configure transfer mode */
1455 rc = ata_set_mode(ap, &dev);
1461 for (i = 0; i < ATA_MAX_DEVICES; i++)
1462 if (ata_dev_enabled(&ap->device[i]))
1465 /* no device present, disable port */
1466 ata_port_disable(ap);
1467 ap->ops->port_disable(ap);
1474 tries[dev->devno] = 0;
1477 sata_down_spd_limit(ap);
1480 tries[dev->devno]--;
1481 if (down_xfermask &&
1482 ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
1483 tries[dev->devno] = 0;
1486 if (!tries[dev->devno]) {
1487 ata_down_xfermask_limit(dev, 1);
1488 ata_dev_disable(dev);
1495 * ata_port_probe - Mark port as enabled
1496 * @ap: Port for which we indicate enablement
1498 * Modify @ap data structure such that the system
1499 * thinks that the entire port is enabled.
1501 * LOCKING: host_set lock, or some other form of
1505 void ata_port_probe(struct ata_port *ap)
1507 ap->flags &= ~ATA_FLAG_DISABLED;
1511 * sata_print_link_status - Print SATA link status
1512 * @ap: SATA port to printk link status about
1514 * This function prints link speed and status of a SATA link.
1519 static void sata_print_link_status(struct ata_port *ap)
1521 u32 sstatus, scontrol, tmp;
1523 if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1525 sata_scr_read(ap, SCR_CONTROL, &scontrol);
1527 if (ata_port_online(ap)) {
1528 tmp = (sstatus >> 4) & 0xf;
1529 ata_port_printk(ap, KERN_INFO,
1530 "SATA link up %s (SStatus %X SControl %X)\n",
1531 sata_spd_string(tmp), sstatus, scontrol);
1533 ata_port_printk(ap, KERN_INFO,
1534 "SATA link down (SStatus %X SControl %X)\n",
1540 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1541 * @ap: SATA port associated with target SATA PHY.
1543 * This function issues commands to standard SATA Sxxx
1544 * PHY registers, to wake up the phy (and device), and
1545 * clear any reset condition.
1548 * PCI/etc. bus probe sem.
1551 void __sata_phy_reset(struct ata_port *ap)
1554 unsigned long timeout = jiffies + (HZ * 5);
1556 if (ap->flags & ATA_FLAG_SATA_RESET) {
1557 /* issue phy wake/reset */
1558 sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1559 /* Couldn't find anything in SATA I/II specs, but
1560 * AHCI-1.1 10.4.2 says at least 1 ms. */
1563 /* phy wake/clear reset */
1564 sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
1566 /* wait for phy to become ready, if necessary */
1569 sata_scr_read(ap, SCR_STATUS, &sstatus);
1570 if ((sstatus & 0xf) != 1)
1572 } while (time_before(jiffies, timeout));
1574 /* print link status */
1575 sata_print_link_status(ap);
1577 /* TODO: phy layer with polling, timeouts, etc. */
1578 if (!ata_port_offline(ap))
1581 ata_port_disable(ap);
1583 if (ap->flags & ATA_FLAG_DISABLED)
1586 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1587 ata_port_disable(ap);
1591 ap->cbl = ATA_CBL_SATA;
1595 * sata_phy_reset - Reset SATA bus.
1596 * @ap: SATA port associated with target SATA PHY.
1598 * This function resets the SATA bus, and then probes
1599 * the bus for devices.
1602 * PCI/etc. bus probe sem.
1605 void sata_phy_reset(struct ata_port *ap)
1607 __sata_phy_reset(ap);
1608 if (ap->flags & ATA_FLAG_DISABLED)
1614 * ata_dev_pair - return other device on cable
1617 * Obtain the other device on the same cable, or if none is
1618 * present NULL is returned
1621 struct ata_device *ata_dev_pair(struct ata_device *adev)
1623 struct ata_port *ap = adev->ap;
1624 struct ata_device *pair = &ap->device[1 - adev->devno];
1625 if (!ata_dev_enabled(pair))
1631 * ata_port_disable - Disable port.
1632 * @ap: Port to be disabled.
1634 * Modify @ap data structure such that the system
1635 * thinks that the entire port is disabled, and should
1636 * never attempt to probe or communicate with devices
1639 * LOCKING: host_set lock, or some other form of
1643 void ata_port_disable(struct ata_port *ap)
1645 ap->device[0].class = ATA_DEV_NONE;
1646 ap->device[1].class = ATA_DEV_NONE;
1647 ap->flags |= ATA_FLAG_DISABLED;
1651 * sata_down_spd_limit - adjust SATA spd limit downward
1652 * @ap: Port to adjust SATA spd limit for
1654 * Adjust SATA spd limit of @ap downward. Note that this
1655 * function only adjusts the limit. The change must be applied
1656 * using sata_set_spd().
1659 * Inherited from caller.
1662 * 0 on success, negative errno on failure
1664 int sata_down_spd_limit(struct ata_port *ap)
1666 u32 sstatus, spd, mask;
1669 rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
1673 mask = ap->sata_spd_limit;
1676 highbit = fls(mask) - 1;
1677 mask &= ~(1 << highbit);
1679 spd = (sstatus >> 4) & 0xf;
1683 mask &= (1 << spd) - 1;
1687 ap->sata_spd_limit = mask;
1689 ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
1690 sata_spd_string(fls(mask)));
1695 static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
1699 if (ap->sata_spd_limit == UINT_MAX)
1702 limit = fls(ap->sata_spd_limit);
1704 spd = (*scontrol >> 4) & 0xf;
1705 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
1707 return spd != limit;
1711 * sata_set_spd_needed - is SATA spd configuration needed
1712 * @ap: Port in question
1714 * Test whether the spd limit in SControl matches
1715 * @ap->sata_spd_limit. This function is used to determine
1716 * whether hardreset is necessary to apply SATA spd
1720 * Inherited from caller.
1723 * 1 if SATA spd configuration is needed, 0 otherwise.
1725 int sata_set_spd_needed(struct ata_port *ap)
1729 if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
1732 return __sata_set_spd_needed(ap, &scontrol);
1736 * sata_set_spd - set SATA spd according to spd limit
1737 * @ap: Port to set SATA spd for
1739 * Set SATA spd of @ap according to sata_spd_limit.
1742 * Inherited from caller.
1745 * 0 if spd doesn't need to be changed, 1 if spd has been
1746 * changed. Negative errno if SCR registers are inaccessible.
1748 int sata_set_spd(struct ata_port *ap)
1753 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
1756 if (!__sata_set_spd_needed(ap, &scontrol))
1759 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
1766 * This mode timing computation functionality is ported over from
1767 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1770 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1771 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1772 * for PIO 5, which is a nonstandard extension and UDMA6, which
1773 * is currently supported only by Maxtor drives.
1776 static const struct ata_timing ata_timing[] = {
1778 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1779 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1780 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1781 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1783 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1784 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1785 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1787 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1789 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1790 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1791 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1793 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1794 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1795 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1797 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1798 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1799 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1801 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1802 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1803 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1805 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1810 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1811 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1813 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1815 q->setup = EZ(t->setup * 1000, T);
1816 q->act8b = EZ(t->act8b * 1000, T);
1817 q->rec8b = EZ(t->rec8b * 1000, T);
1818 q->cyc8b = EZ(t->cyc8b * 1000, T);
1819 q->active = EZ(t->active * 1000, T);
1820 q->recover = EZ(t->recover * 1000, T);
1821 q->cycle = EZ(t->cycle * 1000, T);
1822 q->udma = EZ(t->udma * 1000, UT);
1825 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1826 struct ata_timing *m, unsigned int what)
1828 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1829 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1830 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1831 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1832 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1833 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1834 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1835 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1838 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1840 const struct ata_timing *t;
1842 for (t = ata_timing; t->mode != speed; t++)
1843 if (t->mode == 0xFF)
1848 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1849 struct ata_timing *t, int T, int UT)
1851 const struct ata_timing *s;
1852 struct ata_timing p;
1858 if (!(s = ata_timing_find_mode(speed)))
1861 memcpy(t, s, sizeof(*s));
1864 * If the drive is an EIDE drive, it can tell us it needs extended
1865 * PIO/MW_DMA cycle timing.
1868 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1869 memset(&p, 0, sizeof(p));
1870 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1871 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1872 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1873 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1874 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1876 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1880 * Convert the timing to bus clock counts.
1883 ata_timing_quantize(t, t, T, UT);
1886 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1887 * S.M.A.R.T * and some other commands. We have to ensure that the
1888 * DMA cycle timing is slower/equal than the fastest PIO timing.
1891 if (speed > XFER_PIO_4) {
1892 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1893 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1897 * Lengthen active & recovery time so that cycle time is correct.
1900 if (t->act8b + t->rec8b < t->cyc8b) {
1901 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1902 t->rec8b = t->cyc8b - t->act8b;
1905 if (t->active + t->recover < t->cycle) {
1906 t->active += (t->cycle - (t->active + t->recover)) / 2;
1907 t->recover = t->cycle - t->active;
1914 * ata_down_xfermask_limit - adjust dev xfer masks downward
1915 * @dev: Device to adjust xfer masks
1916 * @force_pio0: Force PIO0
1918 * Adjust xfer masks of @dev downward. Note that this function
1919 * does not apply the change. Invoking ata_set_mode() afterwards
1920 * will apply the limit.
1923 * Inherited from caller.
1926 * 0 on success, negative errno on failure
1928 int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
1930 unsigned long xfer_mask;
1933 xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
1938 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1939 if (xfer_mask & ATA_MASK_UDMA)
1940 xfer_mask &= ~ATA_MASK_MWDMA;
1942 highbit = fls(xfer_mask) - 1;
1943 xfer_mask &= ~(1 << highbit);
1945 xfer_mask &= 1 << ATA_SHIFT_PIO;
1949 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
1952 ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
1953 ata_mode_string(xfer_mask));
1961 static int ata_dev_set_mode(struct ata_device *dev)
1963 unsigned int err_mask;
1966 dev->flags &= ~ATA_DFLAG_PIO;
1967 if (dev->xfer_shift == ATA_SHIFT_PIO)
1968 dev->flags |= ATA_DFLAG_PIO;
1970 err_mask = ata_dev_set_xfermode(dev);
1972 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
1973 "(err_mask=0x%x)\n", err_mask);
1977 rc = ata_dev_revalidate(dev, 0);
1981 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1982 dev->xfer_shift, (int)dev->xfer_mode);
1984 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
1985 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1990 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1991 * @ap: port on which timings will be programmed
1992 * @r_failed_dev: out paramter for failed device
1994 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1995 * ata_set_mode() fails, pointer to the failing device is
1996 * returned in @r_failed_dev.
1999 * PCI/etc. bus probe sem.
2002 * 0 on success, negative errno otherwise
2004 int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
2006 struct ata_device *dev;
2007 int i, rc = 0, used_dma = 0, found = 0;
2009 /* has private set_mode? */
2010 if (ap->ops->set_mode) {
2011 /* FIXME: make ->set_mode handle no device case and
2012 * return error code and failing device on failure.
2014 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2015 if (ata_dev_enabled(&ap->device[i])) {
2016 ap->ops->set_mode(ap);
2023 /* step 1: calculate xfer_mask */
2024 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2025 unsigned int pio_mask, dma_mask;
2027 dev = &ap->device[i];
2029 if (!ata_dev_enabled(dev))
2032 ata_dev_xfermask(dev);
2034 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2035 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2036 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2037 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2046 /* step 2: always set host PIO timings */
2047 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2048 dev = &ap->device[i];
2049 if (!ata_dev_enabled(dev))
2052 if (!dev->pio_mode) {
2053 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2058 dev->xfer_mode = dev->pio_mode;
2059 dev->xfer_shift = ATA_SHIFT_PIO;
2060 if (ap->ops->set_piomode)
2061 ap->ops->set_piomode(ap, dev);
2064 /* step 3: set host DMA timings */
2065 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2066 dev = &ap->device[i];
2068 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2071 dev->xfer_mode = dev->dma_mode;
2072 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2073 if (ap->ops->set_dmamode)
2074 ap->ops->set_dmamode(ap, dev);
2077 /* step 4: update devices' xfer mode */
2078 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2079 dev = &ap->device[i];
2081 if (!ata_dev_enabled(dev))
2084 rc = ata_dev_set_mode(dev);
2089 /* Record simplex status. If we selected DMA then the other
2090 * host channels are not permitted to do so.
2092 if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
2093 ap->host_set->simplex_claimed = 1;
2095 /* step5: chip specific finalisation */
2096 if (ap->ops->post_set_mode)
2097 ap->ops->post_set_mode(ap);
2101 *r_failed_dev = dev;
2106 * ata_tf_to_host - issue ATA taskfile to host controller
2107 * @ap: port to which command is being issued
2108 * @tf: ATA taskfile register set
2110 * Issues ATA taskfile register set to ATA host controller,
2111 * with proper synchronization with interrupt handler and
2115 * spin_lock_irqsave(host_set lock)
2118 static inline void ata_tf_to_host(struct ata_port *ap,
2119 const struct ata_taskfile *tf)
2121 ap->ops->tf_load(ap, tf);
2122 ap->ops->exec_command(ap, tf);
2126 * ata_busy_sleep - sleep until BSY clears, or timeout
2127 * @ap: port containing status register to be polled
2128 * @tmout_pat: impatience timeout
2129 * @tmout: overall timeout
2131 * Sleep until ATA Status register bit BSY clears,
2132 * or a timeout occurs.
2137 unsigned int ata_busy_sleep (struct ata_port *ap,
2138 unsigned long tmout_pat, unsigned long tmout)
2140 unsigned long timer_start, timeout;
2143 status = ata_busy_wait(ap, ATA_BUSY, 300);
2144 timer_start = jiffies;
2145 timeout = timer_start + tmout_pat;
2146 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2148 status = ata_busy_wait(ap, ATA_BUSY, 3);
2151 if (status & ATA_BUSY)
2152 ata_port_printk(ap, KERN_WARNING,
2153 "port is slow to respond, please be patient\n");
2155 timeout = timer_start + tmout;
2156 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2158 status = ata_chk_status(ap);
2161 if (status & ATA_BUSY) {
2162 ata_port_printk(ap, KERN_ERR, "port failed to respond "
2163 "(%lu secs)\n", tmout / HZ);
2170 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2172 struct ata_ioports *ioaddr = &ap->ioaddr;
2173 unsigned int dev0 = devmask & (1 << 0);
2174 unsigned int dev1 = devmask & (1 << 1);
2175 unsigned long timeout;
2177 /* if device 0 was found in ata_devchk, wait for its
2181 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2183 /* if device 1 was found in ata_devchk, wait for
2184 * register access, then wait for BSY to clear
2186 timeout = jiffies + ATA_TMOUT_BOOT;
2190 ap->ops->dev_select(ap, 1);
2191 if (ap->flags & ATA_FLAG_MMIO) {
2192 nsect = readb((void __iomem *) ioaddr->nsect_addr);
2193 lbal = readb((void __iomem *) ioaddr->lbal_addr);
2195 nsect = inb(ioaddr->nsect_addr);
2196 lbal = inb(ioaddr->lbal_addr);
2198 if ((nsect == 1) && (lbal == 1))
2200 if (time_after(jiffies, timeout)) {
2204 msleep(50); /* give drive a breather */
2207 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2209 /* is all this really necessary? */
2210 ap->ops->dev_select(ap, 0);
2212 ap->ops->dev_select(ap, 1);
2214 ap->ops->dev_select(ap, 0);
2217 static unsigned int ata_bus_softreset(struct ata_port *ap,
2218 unsigned int devmask)
2220 struct ata_ioports *ioaddr = &ap->ioaddr;
2222 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2224 /* software reset. causes dev0 to be selected */
2225 if (ap->flags & ATA_FLAG_MMIO) {
2226 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2227 udelay(20); /* FIXME: flush */
2228 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2229 udelay(20); /* FIXME: flush */
2230 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2232 outb(ap->ctl, ioaddr->ctl_addr);
2234 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2236 outb(ap->ctl, ioaddr->ctl_addr);
2239 /* spec mandates ">= 2ms" before checking status.
2240 * We wait 150ms, because that was the magic delay used for
2241 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2242 * between when the ATA command register is written, and then
2243 * status is checked. Because waiting for "a while" before
2244 * checking status is fine, post SRST, we perform this magic
2245 * delay here as well.
2247 * Old drivers/ide uses the 2mS rule and then waits for ready
2251 /* Before we perform post reset processing we want to see if
2252 * the bus shows 0xFF because the odd clown forgets the D7
2253 * pulldown resistor.
2255 if (ata_check_status(ap) == 0xFF) {
2256 ata_port_printk(ap, KERN_ERR, "SRST failed (status 0xFF)\n");
2257 return AC_ERR_OTHER;
2260 ata_bus_post_reset(ap, devmask);
2266 * ata_bus_reset - reset host port and associated ATA channel
2267 * @ap: port to reset
2269 * This is typically the first time we actually start issuing
2270 * commands to the ATA channel. We wait for BSY to clear, then
2271 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2272 * result. Determine what devices, if any, are on the channel
2273 * by looking at the device 0/1 error register. Look at the signature
2274 * stored in each device's taskfile registers, to determine if
2275 * the device is ATA or ATAPI.
2278 * PCI/etc. bus probe sem.
2279 * Obtains host_set lock.
2282 * Sets ATA_FLAG_DISABLED if bus reset fails.
2285 void ata_bus_reset(struct ata_port *ap)
2287 struct ata_ioports *ioaddr = &ap->ioaddr;
2288 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2290 unsigned int dev0, dev1 = 0, devmask = 0;
2292 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2294 /* determine if device 0/1 are present */
2295 if (ap->flags & ATA_FLAG_SATA_RESET)
2298 dev0 = ata_devchk(ap, 0);
2300 dev1 = ata_devchk(ap, 1);
2304 devmask |= (1 << 0);
2306 devmask |= (1 << 1);
2308 /* select device 0 again */
2309 ap->ops->dev_select(ap, 0);
2311 /* issue bus reset */
2312 if (ap->flags & ATA_FLAG_SRST)
2313 if (ata_bus_softreset(ap, devmask))
2317 * determine by signature whether we have ATA or ATAPI devices
2319 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2320 if ((slave_possible) && (err != 0x81))
2321 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2323 /* re-enable interrupts */
2324 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2327 /* is double-select really necessary? */
2328 if (ap->device[1].class != ATA_DEV_NONE)
2329 ap->ops->dev_select(ap, 1);
2330 if (ap->device[0].class != ATA_DEV_NONE)
2331 ap->ops->dev_select(ap, 0);
2333 /* if no devices were detected, disable this port */
2334 if ((ap->device[0].class == ATA_DEV_NONE) &&
2335 (ap->device[1].class == ATA_DEV_NONE))
2338 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2339 /* set up device control for ATA_FLAG_SATA_RESET */
2340 if (ap->flags & ATA_FLAG_MMIO)
2341 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2343 outb(ap->ctl, ioaddr->ctl_addr);
2350 ata_port_printk(ap, KERN_ERR, "disabling port\n");
2351 ap->ops->port_disable(ap);
2356 static int sata_phy_resume(struct ata_port *ap)
2358 unsigned long timeout = jiffies + (HZ * 5);
2359 u32 scontrol, sstatus;
2362 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2365 scontrol = (scontrol & 0x0f0) | 0x300;
2367 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2370 /* Wait for phy to become ready, if necessary. */
2373 if ((rc = sata_scr_read(ap, SCR_STATUS, &sstatus)))
2375 if ((sstatus & 0xf) != 1)
2377 } while (time_before(jiffies, timeout));
2383 * ata_std_probeinit - initialize probing
2384 * @ap: port to be probed
2386 * @ap is about to be probed. Initialize it. This function is
2387 * to be used as standard callback for ata_drive_probe_reset().
2389 * NOTE!!! Do not use this function as probeinit if a low level
2390 * driver implements only hardreset. Just pass NULL as probeinit
2391 * in that case. Using this function is probably okay but doing
2392 * so makes reset sequence different from the original
2393 * ->phy_reset implementation and Jeff nervous. :-P
2395 void ata_std_probeinit(struct ata_port *ap)
2400 sata_phy_resume(ap);
2402 /* init sata_spd_limit to the current value */
2403 if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
2404 int spd = (scontrol >> 4) & 0xf;
2405 ap->sata_spd_limit &= (1 << spd) - 1;
2408 /* wait for device */
2409 if (ata_port_online(ap))
2410 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2414 * ata_std_softreset - reset host port via ATA SRST
2415 * @ap: port to reset
2416 * @classes: resulting classes of attached devices
2418 * Reset host port using ATA SRST. This function is to be used
2419 * as standard callback for ata_drive_*_reset() functions.
2422 * Kernel thread context (may sleep)
2425 * 0 on success, -errno otherwise.
2427 int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2429 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2430 unsigned int devmask = 0, err_mask;
2435 if (ata_port_offline(ap)) {
2436 classes[0] = ATA_DEV_NONE;
2440 /* determine if device 0/1 are present */
2441 if (ata_devchk(ap, 0))
2442 devmask |= (1 << 0);
2443 if (slave_possible && ata_devchk(ap, 1))
2444 devmask |= (1 << 1);
2446 /* select device 0 again */
2447 ap->ops->dev_select(ap, 0);
2449 /* issue bus reset */
2450 DPRINTK("about to softreset, devmask=%x\n", devmask);
2451 err_mask = ata_bus_softreset(ap, devmask);
2453 ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
2458 /* determine by signature whether we have ATA or ATAPI devices */
2459 classes[0] = ata_dev_try_classify(ap, 0, &err);
2460 if (slave_possible && err != 0x81)
2461 classes[1] = ata_dev_try_classify(ap, 1, &err);
2464 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2469 * sata_std_hardreset - reset host port via SATA phy reset
2470 * @ap: port to reset
2471 * @class: resulting class of attached device
2473 * SATA phy-reset host port using DET bits of SControl register.
2474 * This function is to be used as standard callback for
2475 * ata_drive_*_reset().
2478 * Kernel thread context (may sleep)
2481 * 0 on success, -errno otherwise.
2483 int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
2490 if (sata_set_spd_needed(ap)) {
2491 /* SATA spec says nothing about how to reconfigure
2492 * spd. To be on the safe side, turn off phy during
2493 * reconfiguration. This works for at least ICH7 AHCI
2496 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2499 scontrol = (scontrol & 0x0f0) | 0x302;
2501 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2507 /* issue phy wake/reset */
2508 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2511 scontrol = (scontrol & 0x0f0) | 0x301;
2513 if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
2516 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2517 * 10.4.2 says at least 1 ms.
2521 /* bring phy back */
2522 sata_phy_resume(ap);
2524 /* TODO: phy layer with polling, timeouts, etc. */
2525 if (ata_port_offline(ap)) {
2526 *class = ATA_DEV_NONE;
2527 DPRINTK("EXIT, link offline\n");
2531 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2532 ata_port_printk(ap, KERN_ERR,
2533 "COMRESET failed (device not ready)\n");
2537 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2539 *class = ata_dev_try_classify(ap, 0, NULL);
2541 DPRINTK("EXIT, class=%u\n", *class);
2546 * ata_std_postreset - standard postreset callback
2547 * @ap: the target ata_port
2548 * @classes: classes of attached devices
2550 * This function is invoked after a successful reset. Note that
2551 * the device might have been reset more than once using
2552 * different reset methods before postreset is invoked.
2554 * This function is to be used as standard callback for
2555 * ata_drive_*_reset().
2558 * Kernel thread context (may sleep)
2560 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2566 /* print link status */
2567 sata_print_link_status(ap);
2570 if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
2571 sata_scr_write(ap, SCR_ERROR, serror);
2573 /* re-enable interrupts */
2574 if (!ap->ops->error_handler) {
2575 /* FIXME: hack. create a hook instead */
2576 if (ap->ioaddr.ctl_addr)
2580 /* is double-select really necessary? */
2581 if (classes[0] != ATA_DEV_NONE)
2582 ap->ops->dev_select(ap, 1);
2583 if (classes[1] != ATA_DEV_NONE)
2584 ap->ops->dev_select(ap, 0);
2586 /* bail out if no device is present */
2587 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2588 DPRINTK("EXIT, no device\n");
2592 /* set up device control */
2593 if (ap->ioaddr.ctl_addr) {
2594 if (ap->flags & ATA_FLAG_MMIO)
2595 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2597 outb(ap->ctl, ap->ioaddr.ctl_addr);
2604 * ata_std_probe_reset - standard probe reset method
2605 * @ap: prot to perform probe-reset
2606 * @classes: resulting classes of attached devices
2608 * The stock off-the-shelf ->probe_reset method.
2611 * Kernel thread context (may sleep)
2614 * 0 on success, -errno otherwise.
2616 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2618 ata_reset_fn_t hardreset;
2621 if (sata_scr_valid(ap))
2622 hardreset = sata_std_hardreset;
2624 return ata_drive_probe_reset(ap, ata_std_probeinit,
2625 ata_std_softreset, hardreset,
2626 ata_std_postreset, classes);
2629 int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
2630 unsigned int *classes)
2634 for (i = 0; i < ATA_MAX_DEVICES; i++)
2635 classes[i] = ATA_DEV_UNKNOWN;
2637 rc = reset(ap, classes);
2641 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2642 * is complete and convert all ATA_DEV_UNKNOWN to
2645 for (i = 0; i < ATA_MAX_DEVICES; i++)
2646 if (classes[i] != ATA_DEV_UNKNOWN)
2649 if (i < ATA_MAX_DEVICES)
2650 for (i = 0; i < ATA_MAX_DEVICES; i++)
2651 if (classes[i] == ATA_DEV_UNKNOWN)
2652 classes[i] = ATA_DEV_NONE;
2658 * ata_drive_probe_reset - Perform probe reset with given methods
2659 * @ap: port to reset
2660 * @probeinit: probeinit method (can be NULL)
2661 * @softreset: softreset method (can be NULL)
2662 * @hardreset: hardreset method (can be NULL)
2663 * @postreset: postreset method (can be NULL)
2664 * @classes: resulting classes of attached devices
2666 * Reset the specified port and classify attached devices using
2667 * given methods. This function prefers softreset but tries all
2668 * possible reset sequences to reset and classify devices. This
2669 * function is intended to be used for constructing ->probe_reset
2670 * callback by low level drivers.
2672 * Reset methods should follow the following rules.
2674 * - Return 0 on sucess, -errno on failure.
2675 * - If classification is supported, fill classes[] with
2676 * recognized class codes.
2677 * - If classification is not supported, leave classes[] alone.
2680 * Kernel thread context (may sleep)
2683 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2684 * if classification fails, and any error code from reset
2687 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2688 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2689 ata_postreset_fn_t postreset, unsigned int *classes)
2693 ata_eh_freeze_port(ap);
2698 if (softreset && !sata_set_spd_needed(ap)) {
2699 rc = ata_do_reset(ap, softreset, classes);
2700 if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
2702 ata_port_printk(ap, KERN_INFO, "softreset failed, "
2703 "will try hardreset in 5 secs\n");
2711 rc = ata_do_reset(ap, hardreset, classes);
2713 if (classes[0] != ATA_DEV_UNKNOWN)
2718 if (sata_down_spd_limit(ap))
2721 ata_port_printk(ap, KERN_INFO, "hardreset failed, "
2722 "will retry in 5 secs\n");
2727 ata_port_printk(ap, KERN_INFO,
2728 "hardreset succeeded without classification, "
2729 "will retry softreset in 5 secs\n");
2732 rc = ata_do_reset(ap, softreset, classes);
2738 postreset(ap, classes);
2740 ata_eh_thaw_port(ap);
2742 if (classes[0] == ATA_DEV_UNKNOWN)
2749 * ata_dev_same_device - Determine whether new ID matches configured device
2750 * @dev: device to compare against
2751 * @new_class: class of the new device
2752 * @new_id: IDENTIFY page of the new device
2754 * Compare @new_class and @new_id against @dev and determine
2755 * whether @dev is the device indicated by @new_class and
2762 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2764 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
2767 const u16 *old_id = dev->id;
2768 unsigned char model[2][41], serial[2][21];
2771 if (dev->class != new_class) {
2772 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
2773 dev->class, new_class);
2777 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2778 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2779 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2780 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2781 new_n_sectors = ata_id_n_sectors(new_id);
2783 if (strcmp(model[0], model[1])) {
2784 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
2785 "'%s' != '%s'\n", model[0], model[1]);
2789 if (strcmp(serial[0], serial[1])) {
2790 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
2791 "'%s' != '%s'\n", serial[0], serial[1]);
2795 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2796 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
2798 (unsigned long long)dev->n_sectors,
2799 (unsigned long long)new_n_sectors);
2807 * ata_dev_revalidate - Revalidate ATA device
2808 * @dev: device to revalidate
2809 * @post_reset: is this revalidation after reset?
2811 * Re-read IDENTIFY page and make sure @dev is still attached to
2815 * Kernel thread context (may sleep)
2818 * 0 on success, negative errno otherwise
2820 int ata_dev_revalidate(struct ata_device *dev, int post_reset)
2822 unsigned int class = dev->class;
2823 u16 *id = (void *)dev->ap->sector_buf;
2826 if (!ata_dev_enabled(dev)) {
2832 rc = ata_dev_read_id(dev, &class, post_reset, id);
2836 /* is the device still there? */
2837 if (!ata_dev_same_device(dev, class, id)) {
2842 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
2844 /* configure device according to the new ID */
2845 rc = ata_dev_configure(dev, 0);
2850 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
2854 static const char * const ata_dma_blacklist [] = {
2855 "WDC AC11000H", NULL,
2856 "WDC AC22100H", NULL,
2857 "WDC AC32500H", NULL,
2858 "WDC AC33100H", NULL,
2859 "WDC AC31600H", NULL,
2860 "WDC AC32100H", "24.09P07",
2861 "WDC AC23200L", "21.10N21",
2862 "Compaq CRD-8241B", NULL,
2867 "SanDisk SDP3B", NULL,
2868 "SanDisk SDP3B-64", NULL,
2869 "SANYO CD-ROM CRD", NULL,
2870 "HITACHI CDR-8", NULL,
2871 "HITACHI CDR-8335", NULL,
2872 "HITACHI CDR-8435", NULL,
2873 "Toshiba CD-ROM XM-6202B", NULL,
2874 "TOSHIBA CD-ROM XM-1702BC", NULL,
2876 "E-IDE CD-ROM CR-840", NULL,
2877 "CD-ROM Drive/F5A", NULL,
2878 "WPI CDD-820", NULL,
2879 "SAMSUNG CD-ROM SC-148C", NULL,
2880 "SAMSUNG CD-ROM SC", NULL,
2881 "SanDisk SDP3B-64", NULL,
2882 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2883 "_NEC DV5800A", NULL,
2884 "SAMSUNG CD-ROM SN-124", "N001"
2887 static int ata_strim(char *s, size_t len)
2889 len = strnlen(s, len);
2891 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2892 while ((len > 0) && (s[len - 1] == ' ')) {
2899 static int ata_dma_blacklisted(const struct ata_device *dev)
2901 unsigned char model_num[40];
2902 unsigned char model_rev[16];
2903 unsigned int nlen, rlen;
2906 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2908 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2910 nlen = ata_strim(model_num, sizeof(model_num));
2911 rlen = ata_strim(model_rev, sizeof(model_rev));
2913 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2914 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2915 if (ata_dma_blacklist[i+1] == NULL)
2917 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2925 * ata_dev_xfermask - Compute supported xfermask of the given device
2926 * @dev: Device to compute xfermask for
2928 * Compute supported xfermask of @dev and store it in
2929 * dev->*_mask. This function is responsible for applying all
2930 * known limits including host controller limits, device
2933 * FIXME: The current implementation limits all transfer modes to
2934 * the fastest of the lowested device on the port. This is not
2935 * required on most controllers.
2940 static void ata_dev_xfermask(struct ata_device *dev)
2942 struct ata_port *ap = dev->ap;
2943 struct ata_host_set *hs = ap->host_set;
2944 unsigned long xfer_mask;
2947 xfer_mask = ata_pack_xfermask(ap->pio_mask,
2948 ap->mwdma_mask, ap->udma_mask);
2950 /* Apply cable rule here. Don't apply it early because when
2951 * we handle hot plug the cable type can itself change.
2953 if (ap->cbl == ATA_CBL_PATA40)
2954 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
2956 /* FIXME: Use port-wide xfermask for now */
2957 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2958 struct ata_device *d = &ap->device[i];
2960 if (ata_dev_absent(d))
2963 if (ata_dev_disabled(d)) {
2964 /* to avoid violating device selection timing */
2965 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2966 UINT_MAX, UINT_MAX);
2970 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2971 d->mwdma_mask, d->udma_mask);
2972 xfer_mask &= ata_id_xfermask(d->id);
2973 if (ata_dma_blacklisted(d))
2974 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2977 if (ata_dma_blacklisted(dev))
2978 ata_dev_printk(dev, KERN_WARNING,
2979 "device is on DMA blacklist, disabling DMA\n");
2981 if (hs->flags & ATA_HOST_SIMPLEX) {
2982 if (hs->simplex_claimed)
2983 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2986 if (ap->ops->mode_filter)
2987 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
2989 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
2990 &dev->mwdma_mask, &dev->udma_mask);
2994 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2995 * @dev: Device to which command will be sent
2997 * Issue SET FEATURES - XFER MODE command to device @dev
3001 * PCI/etc. bus probe sem.
3004 * 0 on success, AC_ERR_* mask otherwise.
3007 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
3009 struct ata_taskfile tf;
3010 unsigned int err_mask;
3012 /* set up set-features taskfile */
3013 DPRINTK("set features - xfer mode\n");
3015 ata_tf_init(dev, &tf);
3016 tf.command = ATA_CMD_SET_FEATURES;
3017 tf.feature = SETFEATURES_XFER;
3018 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3019 tf.protocol = ATA_PROT_NODATA;
3020 tf.nsect = dev->xfer_mode;
3022 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3024 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3029 * ata_dev_init_params - Issue INIT DEV PARAMS command
3030 * @dev: Device to which command will be sent
3031 * @heads: Number of heads
3032 * @sectors: Number of sectors
3035 * Kernel thread context (may sleep)
3038 * 0 on success, AC_ERR_* mask otherwise.
3040 static unsigned int ata_dev_init_params(struct ata_device *dev,
3041 u16 heads, u16 sectors)
3043 struct ata_taskfile tf;
3044 unsigned int err_mask;
3046 /* Number of sectors per track 1-255. Number of heads 1-16 */
3047 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3048 return AC_ERR_INVALID;
3050 /* set up init dev params taskfile */
3051 DPRINTK("init dev params \n");
3053 ata_tf_init(dev, &tf);
3054 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3055 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3056 tf.protocol = ATA_PROT_NODATA;
3058 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
3060 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3062 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3067 * ata_sg_clean - Unmap DMA memory associated with command
3068 * @qc: Command containing DMA memory to be released
3070 * Unmap all mapped DMA memory associated with this command.
3073 * spin_lock_irqsave(host_set lock)
3076 static void ata_sg_clean(struct ata_queued_cmd *qc)
3078 struct ata_port *ap = qc->ap;
3079 struct scatterlist *sg = qc->__sg;
3080 int dir = qc->dma_dir;
3081 void *pad_buf = NULL;
3083 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3084 WARN_ON(sg == NULL);
3086 if (qc->flags & ATA_QCFLAG_SINGLE)
3087 WARN_ON(qc->n_elem > 1);
3089 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
3091 /* if we padded the buffer out to 32-bit bound, and data
3092 * xfer direction is from-device, we must copy from the
3093 * pad buffer back into the supplied buffer
3095 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
3096 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3098 if (qc->flags & ATA_QCFLAG_SG) {
3100 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3101 /* restore last sg */
3102 sg[qc->orig_n_elem - 1].length += qc->pad_len;
3104 struct scatterlist *psg = &qc->pad_sgent;
3105 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3106 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
3107 kunmap_atomic(addr, KM_IRQ0);
3111 dma_unmap_single(ap->dev,
3112 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
3115 sg->length += qc->pad_len;
3117 memcpy(qc->buf_virt + sg->length - qc->pad_len,
3118 pad_buf, qc->pad_len);
3121 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3126 * ata_fill_sg - Fill PCI IDE PRD table
3127 * @qc: Metadata associated with taskfile to be transferred
3129 * Fill PCI IDE PRD (scatter-gather) table with segments
3130 * associated with the current disk command.
3133 * spin_lock_irqsave(host_set lock)
3136 static void ata_fill_sg(struct ata_queued_cmd *qc)
3138 struct ata_port *ap = qc->ap;
3139 struct scatterlist *sg;
3142 WARN_ON(qc->__sg == NULL);
3143 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
3146 ata_for_each_sg(sg, qc) {
3150 /* determine if physical DMA addr spans 64K boundary.
3151 * Note h/w doesn't support 64-bit, so we unconditionally
3152 * truncate dma_addr_t to u32.
3154 addr = (u32) sg_dma_address(sg);
3155 sg_len = sg_dma_len(sg);
3158 offset = addr & 0xffff;
3160 if ((offset + sg_len) > 0x10000)
3161 len = 0x10000 - offset;
3163 ap->prd[idx].addr = cpu_to_le32(addr);
3164 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
3165 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
3174 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
3177 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3178 * @qc: Metadata associated with taskfile to check
3180 * Allow low-level driver to filter ATA PACKET commands, returning
3181 * a status indicating whether or not it is OK to use DMA for the
3182 * supplied PACKET command.
3185 * spin_lock_irqsave(host_set lock)
3187 * RETURNS: 0 when ATAPI DMA can be used
3190 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3192 struct ata_port *ap = qc->ap;
3193 int rc = 0; /* Assume ATAPI DMA is OK by default */
3195 if (ap->ops->check_atapi_dma)
3196 rc = ap->ops->check_atapi_dma(qc);
3201 * ata_qc_prep - Prepare taskfile for submission
3202 * @qc: Metadata associated with taskfile to be prepared
3204 * Prepare ATA taskfile for submission.
3207 * spin_lock_irqsave(host_set lock)
3209 void ata_qc_prep(struct ata_queued_cmd *qc)
3211 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3217 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
3220 * ata_sg_init_one - Associate command with memory buffer
3221 * @qc: Command to be associated
3222 * @buf: Memory buffer
3223 * @buflen: Length of memory buffer, in bytes.
3225 * Initialize the data-related elements of queued_cmd @qc
3226 * to point to a single memory buffer, @buf of byte length @buflen.
3229 * spin_lock_irqsave(host_set lock)
3232 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3234 struct scatterlist *sg;
3236 qc->flags |= ATA_QCFLAG_SINGLE;
3238 memset(&qc->sgent, 0, sizeof(qc->sgent));
3239 qc->__sg = &qc->sgent;
3241 qc->orig_n_elem = 1;
3245 sg_init_one(sg, buf, buflen);
3249 * ata_sg_init - Associate command with scatter-gather table.
3250 * @qc: Command to be associated
3251 * @sg: Scatter-gather table.
3252 * @n_elem: Number of elements in s/g table.
3254 * Initialize the data-related elements of queued_cmd @qc
3255 * to point to a scatter-gather table @sg, containing @n_elem
3259 * spin_lock_irqsave(host_set lock)
3262 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3263 unsigned int n_elem)
3265 qc->flags |= ATA_QCFLAG_SG;
3267 qc->n_elem = n_elem;
3268 qc->orig_n_elem = n_elem;
3272 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3273 * @qc: Command with memory buffer to be mapped.
3275 * DMA-map the memory buffer associated with queued_cmd @qc.
3278 * spin_lock_irqsave(host_set lock)
3281 * Zero on success, negative on error.
3284 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3286 struct ata_port *ap = qc->ap;
3287 int dir = qc->dma_dir;
3288 struct scatterlist *sg = qc->__sg;
3289 dma_addr_t dma_address;
3292 /* we must lengthen transfers to end on a 32-bit boundary */
3293 qc->pad_len = sg->length & 3;
3295 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3296 struct scatterlist *psg = &qc->pad_sgent;
3298 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3300 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3302 if (qc->tf.flags & ATA_TFLAG_WRITE)
3303 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3306 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3307 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3309 sg->length -= qc->pad_len;
3310 if (sg->length == 0)
3313 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3314 sg->length, qc->pad_len);
3322 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3324 if (dma_mapping_error(dma_address)) {
3326 sg->length += qc->pad_len;
3330 sg_dma_address(sg) = dma_address;
3331 sg_dma_len(sg) = sg->length;
3334 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3335 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3341 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3342 * @qc: Command with scatter-gather table to be mapped.
3344 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3347 * spin_lock_irqsave(host_set lock)
3350 * Zero on success, negative on error.
3354 static int ata_sg_setup(struct ata_queued_cmd *qc)
3356 struct ata_port *ap = qc->ap;
3357 struct scatterlist *sg = qc->__sg;
3358 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3359 int n_elem, pre_n_elem, dir, trim_sg = 0;
3361 VPRINTK("ENTER, ata%u\n", ap->id);
3362 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3364 /* we must lengthen transfers to end on a 32-bit boundary */
3365 qc->pad_len = lsg->length & 3;
3367 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3368 struct scatterlist *psg = &qc->pad_sgent;
3369 unsigned int offset;
3371 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3373 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3376 * psg->page/offset are used to copy to-be-written
3377 * data in this function or read data in ata_sg_clean.
3379 offset = lsg->offset + lsg->length - qc->pad_len;
3380 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3381 psg->offset = offset_in_page(offset);
3383 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3384 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3385 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3386 kunmap_atomic(addr, KM_IRQ0);
3389 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3390 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3392 lsg->length -= qc->pad_len;
3393 if (lsg->length == 0)
3396 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3397 qc->n_elem - 1, lsg->length, qc->pad_len);
3400 pre_n_elem = qc->n_elem;
3401 if (trim_sg && pre_n_elem)
3410 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3412 /* restore last sg */
3413 lsg->length += qc->pad_len;
3417 DPRINTK("%d sg elements mapped\n", n_elem);
3420 qc->n_elem = n_elem;
3426 * ata_poll_qc_complete - turn irq back on and finish qc
3427 * @qc: Command to complete
3428 * @err_mask: ATA status register content
3431 * None. (grabs host lock)
3433 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3435 struct ata_port *ap = qc->ap;
3436 unsigned long flags;
3438 spin_lock_irqsave(&ap->host_set->lock, flags);
3440 if (ap->ops->error_handler) {
3441 /* EH might have kicked in while host_set lock is released */
3442 qc = ata_qc_from_tag(ap, qc->tag);
3444 if (!(qc->err_mask & AC_ERR_HSM)) {
3445 ap->flags &= ~ATA_FLAG_NOINTR;
3447 ata_qc_complete(qc);
3449 ata_port_freeze(ap);
3453 ap->flags &= ~ATA_FLAG_NOINTR;
3455 ata_qc_complete(qc);
3458 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3462 * ata_pio_poll - poll using PIO, depending on current state
3463 * @qc: qc in progress
3466 * None. (executing in kernel thread context)
3469 * timeout value to use
3471 static unsigned long ata_pio_poll(struct ata_queued_cmd *qc)
3473 struct ata_port *ap = qc->ap;
3475 unsigned int poll_state = HSM_ST_UNKNOWN;
3476 unsigned int reg_state = HSM_ST_UNKNOWN;
3478 switch (ap->hsm_task_state) {
3481 poll_state = HSM_ST_POLL;
3485 case HSM_ST_LAST_POLL:
3486 poll_state = HSM_ST_LAST_POLL;
3487 reg_state = HSM_ST_LAST;
3494 status = ata_chk_status(ap);
3495 if (status & ATA_BUSY) {
3496 if (time_after(jiffies, ap->pio_task_timeout)) {
3497 qc->err_mask |= AC_ERR_TIMEOUT;
3498 ap->hsm_task_state = HSM_ST_TMOUT;
3501 ap->hsm_task_state = poll_state;
3502 return ATA_SHORT_PAUSE;
3505 ap->hsm_task_state = reg_state;
3510 * ata_pio_complete - check if drive is busy or idle
3511 * @qc: qc to complete
3514 * None. (executing in kernel thread context)
3517 * Non-zero if qc completed, zero otherwise.
3519 static int ata_pio_complete(struct ata_queued_cmd *qc)
3521 struct ata_port *ap = qc->ap;
3525 * This is purely heuristic. This is a fast path. Sometimes when
3526 * we enter, BSY will be cleared in a chk-status or two. If not,
3527 * the drive is probably seeking or something. Snooze for a couple
3528 * msecs, then chk-status again. If still busy, fall back to
3529 * HSM_ST_POLL state.
3531 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3532 if (drv_stat & ATA_BUSY) {
3534 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3535 if (drv_stat & ATA_BUSY) {
3536 ap->hsm_task_state = HSM_ST_LAST_POLL;
3537 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3542 drv_stat = ata_wait_idle(ap);
3543 if (!ata_ok(drv_stat)) {
3544 qc->err_mask |= __ac_err_mask(drv_stat);
3545 ap->hsm_task_state = HSM_ST_ERR;
3549 ap->hsm_task_state = HSM_ST_IDLE;
3551 WARN_ON(qc->err_mask);
3552 ata_poll_qc_complete(qc);
3554 /* another command may start at this point */
3561 * swap_buf_le16 - swap halves of 16-bit words in place
3562 * @buf: Buffer to swap
3563 * @buf_words: Number of 16-bit words in buffer.
3565 * Swap halves of 16-bit words if needed to convert from
3566 * little-endian byte order to native cpu byte order, or
3570 * Inherited from caller.
3572 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3577 for (i = 0; i < buf_words; i++)
3578 buf[i] = le16_to_cpu(buf[i]);
3579 #endif /* __BIG_ENDIAN */
3583 * ata_mmio_data_xfer - Transfer data by MMIO
3584 * @ap: port to read/write
3586 * @buflen: buffer length
3587 * @write_data: read/write
3589 * Transfer data from/to the device data register by MMIO.
3592 * Inherited from caller.
3595 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3596 unsigned int buflen, int write_data)
3599 unsigned int words = buflen >> 1;
3600 u16 *buf16 = (u16 *) buf;
3601 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3603 /* Transfer multiple of 2 bytes */
3605 for (i = 0; i < words; i++)
3606 writew(le16_to_cpu(buf16[i]), mmio);
3608 for (i = 0; i < words; i++)
3609 buf16[i] = cpu_to_le16(readw(mmio));
3612 /* Transfer trailing 1 byte, if any. */
3613 if (unlikely(buflen & 0x01)) {
3614 u16 align_buf[1] = { 0 };
3615 unsigned char *trailing_buf = buf + buflen - 1;
3618 memcpy(align_buf, trailing_buf, 1);
3619 writew(le16_to_cpu(align_buf[0]), mmio);
3621 align_buf[0] = cpu_to_le16(readw(mmio));
3622 memcpy(trailing_buf, align_buf, 1);
3628 * ata_pio_data_xfer - Transfer data by PIO
3629 * @ap: port to read/write
3631 * @buflen: buffer length
3632 * @write_data: read/write
3634 * Transfer data from/to the device data register by PIO.
3637 * Inherited from caller.
3640 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3641 unsigned int buflen, int write_data)
3643 unsigned int words = buflen >> 1;
3645 /* Transfer multiple of 2 bytes */
3647 outsw(ap->ioaddr.data_addr, buf, words);
3649 insw(ap->ioaddr.data_addr, buf, words);
3651 /* Transfer trailing 1 byte, if any. */
3652 if (unlikely(buflen & 0x01)) {
3653 u16 align_buf[1] = { 0 };
3654 unsigned char *trailing_buf = buf + buflen - 1;
3657 memcpy(align_buf, trailing_buf, 1);
3658 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3660 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3661 memcpy(trailing_buf, align_buf, 1);
3667 * ata_data_xfer - Transfer data from/to the data register.
3668 * @ap: port to read/write
3670 * @buflen: buffer length
3671 * @do_write: read/write
3673 * Transfer data from/to the device data register.
3676 * Inherited from caller.
3679 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3680 unsigned int buflen, int do_write)
3682 /* Make the crap hardware pay the costs not the good stuff */
3683 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3684 unsigned long flags;
3685 local_irq_save(flags);
3686 if (ap->flags & ATA_FLAG_MMIO)
3687 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3689 ata_pio_data_xfer(ap, buf, buflen, do_write);
3690 local_irq_restore(flags);
3692 if (ap->flags & ATA_FLAG_MMIO)
3693 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3695 ata_pio_data_xfer(ap, buf, buflen, do_write);
3700 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3701 * @qc: Command on going
3703 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3706 * Inherited from caller.
3709 static void ata_pio_sector(struct ata_queued_cmd *qc)
3711 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3712 struct scatterlist *sg = qc->__sg;
3713 struct ata_port *ap = qc->ap;
3715 unsigned int offset;
3718 if (qc->cursect == (qc->nsect - 1))
3719 ap->hsm_task_state = HSM_ST_LAST;
3721 page = sg[qc->cursg].page;
3722 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3724 /* get the current page and offset */
3725 page = nth_page(page, (offset >> PAGE_SHIFT));
3726 offset %= PAGE_SIZE;
3728 buf = kmap(page) + offset;
3733 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3738 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3740 /* do the actual data transfer */
3741 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3742 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3748 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3749 * @qc: Command on going
3750 * @bytes: number of bytes
3752 * Transfer Transfer data from/to the ATAPI device.
3755 * Inherited from caller.
3759 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3761 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3762 struct scatterlist *sg = qc->__sg;
3763 struct ata_port *ap = qc->ap;
3766 unsigned int offset, count;
3768 if (qc->curbytes + bytes >= qc->nbytes)
3769 ap->hsm_task_state = HSM_ST_LAST;
3772 if (unlikely(qc->cursg >= qc->n_elem)) {
3774 * The end of qc->sg is reached and the device expects
3775 * more data to transfer. In order not to overrun qc->sg
3776 * and fulfill length specified in the byte count register,
3777 * - for read case, discard trailing data from the device
3778 * - for write case, padding zero data to the device
3780 u16 pad_buf[1] = { 0 };
3781 unsigned int words = bytes >> 1;
3784 if (words) /* warning if bytes > 1 */
3785 ata_dev_printk(qc->dev, KERN_WARNING,
3786 "%u bytes trailing data\n", bytes);
3788 for (i = 0; i < words; i++)
3789 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3791 ap->hsm_task_state = HSM_ST_LAST;
3795 sg = &qc->__sg[qc->cursg];
3798 offset = sg->offset + qc->cursg_ofs;
3800 /* get the current page and offset */
3801 page = nth_page(page, (offset >> PAGE_SHIFT));
3802 offset %= PAGE_SIZE;
3804 /* don't overrun current sg */
3805 count = min(sg->length - qc->cursg_ofs, bytes);
3807 /* don't cross page boundaries */
3808 count = min(count, (unsigned int)PAGE_SIZE - offset);
3810 buf = kmap(page) + offset;
3813 qc->curbytes += count;
3814 qc->cursg_ofs += count;
3816 if (qc->cursg_ofs == sg->length) {
3821 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3823 /* do the actual data transfer */
3824 ata_data_xfer(ap, buf, count, do_write);
3833 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3834 * @qc: Command on going
3836 * Transfer Transfer data from/to the ATAPI device.
3839 * Inherited from caller.
3842 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3844 struct ata_port *ap = qc->ap;
3845 struct ata_device *dev = qc->dev;
3846 unsigned int ireason, bc_lo, bc_hi, bytes;
3847 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3849 ap->ops->tf_read(ap, &qc->tf);
3850 ireason = qc->tf.nsect;
3851 bc_lo = qc->tf.lbam;
3852 bc_hi = qc->tf.lbah;
3853 bytes = (bc_hi << 8) | bc_lo;
3855 /* shall be cleared to zero, indicating xfer of data */
3856 if (ireason & (1 << 0))
3859 /* make sure transfer direction matches expected */
3860 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3861 if (do_write != i_write)
3864 __atapi_pio_bytes(qc, bytes);
3869 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
3870 qc->err_mask |= AC_ERR_HSM;
3871 ap->hsm_task_state = HSM_ST_ERR;
3875 * ata_pio_block - start PIO on a block
3876 * @qc: qc to transfer block for
3879 * None. (executing in kernel thread context)
3881 static void ata_pio_block(struct ata_queued_cmd *qc)
3883 struct ata_port *ap = qc->ap;
3887 * This is purely heuristic. This is a fast path.
3888 * Sometimes when we enter, BSY will be cleared in
3889 * a chk-status or two. If not, the drive is probably seeking
3890 * or something. Snooze for a couple msecs, then
3891 * chk-status again. If still busy, fall back to
3892 * HSM_ST_POLL state.
3894 status = ata_busy_wait(ap, ATA_BUSY, 5);
3895 if (status & ATA_BUSY) {
3897 status = ata_busy_wait(ap, ATA_BUSY, 10);
3898 if (status & ATA_BUSY) {
3899 ap->hsm_task_state = HSM_ST_POLL;
3900 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3906 if (status & (ATA_ERR | ATA_DF)) {
3907 qc->err_mask |= AC_ERR_DEV;
3908 ap->hsm_task_state = HSM_ST_ERR;
3912 /* transfer data if any */
3913 if (is_atapi_taskfile(&qc->tf)) {
3914 /* DRQ=0 means no more data to transfer */
3915 if ((status & ATA_DRQ) == 0) {
3916 ap->hsm_task_state = HSM_ST_LAST;
3920 atapi_pio_bytes(qc);
3922 /* handle BSY=0, DRQ=0 as error */
3923 if ((status & ATA_DRQ) == 0) {
3924 qc->err_mask |= AC_ERR_HSM;
3925 ap->hsm_task_state = HSM_ST_ERR;
3933 static void ata_pio_error(struct ata_queued_cmd *qc)
3935 struct ata_port *ap = qc->ap;
3937 if (qc->tf.command != ATA_CMD_PACKET)
3938 ata_dev_printk(qc->dev, KERN_WARNING, "PIO error\n");
3940 /* make sure qc->err_mask is available to
3941 * know what's wrong and recover
3943 WARN_ON(qc->err_mask == 0);
3945 ap->hsm_task_state = HSM_ST_IDLE;
3947 ata_poll_qc_complete(qc);
3950 static void ata_pio_task(void *_data)
3952 struct ata_queued_cmd *qc = _data;
3953 struct ata_port *ap = qc->ap;
3954 unsigned long timeout;
3961 switch (ap->hsm_task_state) {
3970 qc_completed = ata_pio_complete(qc);
3974 case HSM_ST_LAST_POLL:
3975 timeout = ata_pio_poll(qc);
3985 ata_port_queue_task(ap, ata_pio_task, qc, timeout);
3986 else if (!qc_completed)
3991 * atapi_packet_task - Write CDB bytes to hardware
3992 * @_data: qc in progress
3994 * When device has indicated its readiness to accept
3995 * a CDB, this function is called. Send the CDB.
3996 * If DMA is to be performed, exit immediately.
3997 * Otherwise, we are in polling mode, so poll
3998 * status under operation succeeds or fails.
4001 * Kernel thread context (may sleep)
4003 static void atapi_packet_task(void *_data)
4005 struct ata_queued_cmd *qc = _data;
4006 struct ata_port *ap = qc->ap;
4009 /* sleep-wait for BSY to clear */
4010 DPRINTK("busy wait\n");
4011 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
4012 qc->err_mask |= AC_ERR_TIMEOUT;
4016 /* make sure DRQ is set */
4017 status = ata_chk_status(ap);
4018 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
4019 qc->err_mask |= AC_ERR_HSM;
4024 DPRINTK("send cdb\n");
4025 WARN_ON(qc->dev->cdb_len < 12);
4027 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
4028 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
4029 unsigned long flags;
4031 /* Once we're done issuing command and kicking bmdma,
4032 * irq handler takes over. To not lose irq, we need
4033 * to clear NOINTR flag before sending cdb, but
4034 * interrupt handler shouldn't be invoked before we're
4035 * finished. Hence, the following locking.
4037 spin_lock_irqsave(&ap->host_set->lock, flags);
4038 ap->flags &= ~ATA_FLAG_NOINTR;
4039 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
4040 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
4041 ap->ops->bmdma_start(qc); /* initiate bmdma */
4042 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4044 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
4046 /* PIO commands are handled by polling */
4047 ap->hsm_task_state = HSM_ST;
4048 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4054 ata_poll_qc_complete(qc);
4058 * ata_qc_new - Request an available ATA command, for queueing
4059 * @ap: Port associated with device @dev
4060 * @dev: Device from whom we request an available command structure
4066 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4068 struct ata_queued_cmd *qc = NULL;
4071 /* no command while frozen */
4072 if (unlikely(ap->flags & ATA_FLAG_FROZEN))
4075 /* the last tag is reserved for internal command. */
4076 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4077 if (!test_and_set_bit(i, &ap->qactive)) {
4078 qc = __ata_qc_from_tag(ap, i);
4089 * ata_qc_new_init - Request an available ATA command, and initialize it
4090 * @dev: Device from whom we request an available command structure
4096 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
4098 struct ata_port *ap = dev->ap;
4099 struct ata_queued_cmd *qc;
4101 qc = ata_qc_new(ap);
4114 * ata_qc_free - free unused ata_queued_cmd
4115 * @qc: Command to complete
4117 * Designed to free unused ata_queued_cmd object
4118 * in case something prevents using it.
4121 * spin_lock_irqsave(host_set lock)
4123 void ata_qc_free(struct ata_queued_cmd *qc)
4125 struct ata_port *ap = qc->ap;
4128 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4132 if (likely(ata_tag_valid(tag))) {
4133 qc->tag = ATA_TAG_POISON;
4134 clear_bit(tag, &ap->qactive);
4138 void __ata_qc_complete(struct ata_queued_cmd *qc)
4140 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4141 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4143 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4146 /* command should be marked inactive atomically with qc completion */
4147 qc->ap->active_tag = ATA_TAG_POISON;
4149 /* atapi: mark qc as inactive to prevent the interrupt handler
4150 * from completing the command twice later, before the error handler
4151 * is called. (when rc != 0 and atapi request sense is needed)
4153 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4155 /* call completion callback */
4156 qc->complete_fn(qc);
4160 * ata_qc_complete - Complete an active ATA command
4161 * @qc: Command to complete
4162 * @err_mask: ATA Status register contents
4164 * Indicate to the mid and upper layers that an ATA
4165 * command has completed, with either an ok or not-ok status.
4168 * spin_lock_irqsave(host_set lock)
4170 void ata_qc_complete(struct ata_queued_cmd *qc)
4172 struct ata_port *ap = qc->ap;
4174 /* XXX: New EH and old EH use different mechanisms to
4175 * synchronize EH with regular execution path.
4177 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4178 * Normal execution path is responsible for not accessing a
4179 * failed qc. libata core enforces the rule by returning NULL
4180 * from ata_qc_from_tag() for failed qcs.
4182 * Old EH depends on ata_qc_complete() nullifying completion
4183 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4184 * not synchronize with interrupt handler. Only PIO task is
4187 if (ap->ops->error_handler) {
4188 WARN_ON(ap->flags & ATA_FLAG_FROZEN);
4190 if (unlikely(qc->err_mask))
4191 qc->flags |= ATA_QCFLAG_FAILED;
4193 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4194 if (!ata_tag_internal(qc->tag)) {
4195 /* always fill result TF for failed qc */
4196 ap->ops->tf_read(ap, &qc->result_tf);
4197 ata_qc_schedule_eh(qc);
4202 /* read result TF if requested */
4203 if (qc->flags & ATA_QCFLAG_RESULT_TF)
4204 ap->ops->tf_read(ap, &qc->result_tf);
4206 __ata_qc_complete(qc);
4208 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4211 /* read result TF if failed or requested */
4212 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4213 ap->ops->tf_read(ap, &qc->result_tf);
4215 __ata_qc_complete(qc);
4219 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4221 struct ata_port *ap = qc->ap;
4223 switch (qc->tf.protocol) {
4225 case ATA_PROT_ATAPI_DMA:
4228 case ATA_PROT_ATAPI:
4230 if (ap->flags & ATA_FLAG_PIO_DMA)
4243 * ata_qc_issue - issue taskfile to device
4244 * @qc: command to issue to device
4246 * Prepare an ATA command to submission to device.
4247 * This includes mapping the data into a DMA-able
4248 * area, filling in the S/G table, and finally
4249 * writing the taskfile to hardware, starting the command.
4252 * spin_lock_irqsave(host_set lock)
4254 void ata_qc_issue(struct ata_queued_cmd *qc)
4256 struct ata_port *ap = qc->ap;
4258 qc->ap->active_tag = qc->tag;
4259 qc->flags |= ATA_QCFLAG_ACTIVE;
4261 if (ata_should_dma_map(qc)) {
4262 if (qc->flags & ATA_QCFLAG_SG) {
4263 if (ata_sg_setup(qc))
4265 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4266 if (ata_sg_setup_one(qc))
4270 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4273 ap->ops->qc_prep(qc);
4275 qc->err_mask |= ap->ops->qc_issue(qc);
4276 if (unlikely(qc->err_mask))
4281 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4282 qc->err_mask |= AC_ERR_SYSTEM;
4284 ata_qc_complete(qc);
4288 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4289 * @qc: command to issue to device
4291 * Using various libata functions and hooks, this function
4292 * starts an ATA command. ATA commands are grouped into
4293 * classes called "protocols", and issuing each type of protocol
4294 * is slightly different.
4296 * May be used as the qc_issue() entry in ata_port_operations.
4299 * spin_lock_irqsave(host_set lock)
4302 * Zero on success, AC_ERR_* mask on failure
4305 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4307 struct ata_port *ap = qc->ap;
4309 ata_dev_select(ap, qc->dev->devno, 1, 0);
4311 switch (qc->tf.protocol) {
4312 case ATA_PROT_NODATA:
4313 ata_tf_to_host(ap, &qc->tf);
4317 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4318 ap->ops->bmdma_setup(qc); /* set up bmdma */
4319 ap->ops->bmdma_start(qc); /* initiate bmdma */
4322 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4323 ata_qc_set_polling(qc);
4324 ata_tf_to_host(ap, &qc->tf);
4325 ap->hsm_task_state = HSM_ST;
4326 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4329 case ATA_PROT_ATAPI:
4330 ata_qc_set_polling(qc);
4331 ata_tf_to_host(ap, &qc->tf);
4332 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4335 case ATA_PROT_ATAPI_NODATA:
4336 ap->flags |= ATA_FLAG_NOINTR;
4337 ata_tf_to_host(ap, &qc->tf);
4338 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4341 case ATA_PROT_ATAPI_DMA:
4342 ap->flags |= ATA_FLAG_NOINTR;
4343 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4344 ap->ops->bmdma_setup(qc); /* set up bmdma */
4345 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4350 return AC_ERR_SYSTEM;
4357 * ata_host_intr - Handle host interrupt for given (port, task)
4358 * @ap: Port on which interrupt arrived (possibly...)
4359 * @qc: Taskfile currently active in engine
4361 * Handle host interrupt for given queued command. Currently,
4362 * only DMA interrupts are handled. All other commands are
4363 * handled via polling with interrupts disabled (nIEN bit).
4366 * spin_lock_irqsave(host_set lock)
4369 * One if interrupt was handled, zero if not (shared irq).
4372 inline unsigned int ata_host_intr (struct ata_port *ap,
4373 struct ata_queued_cmd *qc)
4375 u8 status, host_stat;
4377 switch (qc->tf.protocol) {
4380 case ATA_PROT_ATAPI_DMA:
4381 case ATA_PROT_ATAPI:
4382 /* check status of DMA engine */
4383 host_stat = ap->ops->bmdma_status(ap);
4384 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4386 /* if it's not our irq... */
4387 if (!(host_stat & ATA_DMA_INTR))
4390 /* before we do anything else, clear DMA-Start bit */
4391 ap->ops->bmdma_stop(qc);
4395 case ATA_PROT_ATAPI_NODATA:
4396 case ATA_PROT_NODATA:
4397 /* check altstatus */
4398 status = ata_altstatus(ap);
4399 if (status & ATA_BUSY)
4402 /* check main status, clearing INTRQ */
4403 status = ata_chk_status(ap);
4404 if (unlikely(status & ATA_BUSY))
4406 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4407 ap->id, qc->tf.protocol, status);
4409 /* ack bmdma irq events */
4410 ap->ops->irq_clear(ap);
4412 /* complete taskfile transaction */
4413 qc->err_mask |= ac_err_mask(status);
4414 ata_qc_complete(qc);
4421 return 1; /* irq handled */
4424 ap->stats.idle_irq++;
4427 if ((ap->stats.idle_irq % 1000) == 0) {
4428 ata_irq_ack(ap, 0); /* debug trap */
4429 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
4433 return 0; /* irq not handled */
4437 * ata_interrupt - Default ATA host interrupt handler
4438 * @irq: irq line (unused)
4439 * @dev_instance: pointer to our ata_host_set information structure
4442 * Default interrupt handler for PCI IDE devices. Calls
4443 * ata_host_intr() for each port that is not disabled.
4446 * Obtains host_set lock during operation.
4449 * IRQ_NONE or IRQ_HANDLED.
4452 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4454 struct ata_host_set *host_set = dev_instance;
4456 unsigned int handled = 0;
4457 unsigned long flags;
4459 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4460 spin_lock_irqsave(&host_set->lock, flags);
4462 for (i = 0; i < host_set->n_ports; i++) {
4463 struct ata_port *ap;
4465 ap = host_set->ports[i];
4467 !(ap->flags & (ATA_FLAG_DISABLED | ATA_FLAG_NOINTR))) {
4468 struct ata_queued_cmd *qc;
4470 qc = ata_qc_from_tag(ap, ap->active_tag);
4471 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4472 (qc->flags & ATA_QCFLAG_ACTIVE))
4473 handled |= ata_host_intr(ap, qc);
4477 spin_unlock_irqrestore(&host_set->lock, flags);
4479 return IRQ_RETVAL(handled);
4483 * sata_scr_valid - test whether SCRs are accessible
4484 * @ap: ATA port to test SCR accessibility for
4486 * Test whether SCRs are accessible for @ap.
4492 * 1 if SCRs are accessible, 0 otherwise.
4494 int sata_scr_valid(struct ata_port *ap)
4496 return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
4500 * sata_scr_read - read SCR register of the specified port
4501 * @ap: ATA port to read SCR for
4503 * @val: Place to store read value
4505 * Read SCR register @reg of @ap into *@val. This function is
4506 * guaranteed to succeed if the cable type of the port is SATA
4507 * and the port implements ->scr_read.
4513 * 0 on success, negative errno on failure.
4515 int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
4517 if (sata_scr_valid(ap)) {
4518 *val = ap->ops->scr_read(ap, reg);
4525 * sata_scr_write - write SCR register of the specified port
4526 * @ap: ATA port to write SCR for
4527 * @reg: SCR to write
4528 * @val: value to write
4530 * Write @val to SCR register @reg of @ap. This function is
4531 * guaranteed to succeed if the cable type of the port is SATA
4532 * and the port implements ->scr_read.
4538 * 0 on success, negative errno on failure.
4540 int sata_scr_write(struct ata_port *ap, int reg, u32 val)
4542 if (sata_scr_valid(ap)) {
4543 ap->ops->scr_write(ap, reg, val);
4550 * sata_scr_write_flush - write SCR register of the specified port and flush
4551 * @ap: ATA port to write SCR for
4552 * @reg: SCR to write
4553 * @val: value to write
4555 * This function is identical to sata_scr_write() except that this
4556 * function performs flush after writing to the register.
4562 * 0 on success, negative errno on failure.
4564 int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
4566 if (sata_scr_valid(ap)) {
4567 ap->ops->scr_write(ap, reg, val);
4568 ap->ops->scr_read(ap, reg);
4575 * ata_port_online - test whether the given port is online
4576 * @ap: ATA port to test
4578 * Test whether @ap is online. Note that this function returns 0
4579 * if online status of @ap cannot be obtained, so
4580 * ata_port_online(ap) != !ata_port_offline(ap).
4586 * 1 if the port online status is available and online.
4588 int ata_port_online(struct ata_port *ap)
4592 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
4598 * ata_port_offline - test whether the given port is offline
4599 * @ap: ATA port to test
4601 * Test whether @ap is offline. Note that this function returns
4602 * 0 if offline status of @ap cannot be obtained, so
4603 * ata_port_online(ap) != !ata_port_offline(ap).
4609 * 1 if the port offline status is available and offline.
4611 int ata_port_offline(struct ata_port *ap)
4615 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
4621 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4622 * without filling any other registers
4624 static int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
4626 struct ata_taskfile tf;
4629 ata_tf_init(dev, &tf);
4632 tf.flags |= ATA_TFLAG_DEVICE;
4633 tf.protocol = ATA_PROT_NODATA;
4635 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4637 ata_dev_printk(dev, KERN_ERR, "%s: ata command failed: %d\n",
4643 static int ata_flush_cache(struct ata_device *dev)
4647 if (!ata_try_flush_cache(dev))
4650 if (ata_id_has_flush_ext(dev->id))
4651 cmd = ATA_CMD_FLUSH_EXT;
4653 cmd = ATA_CMD_FLUSH;
4655 return ata_do_simple_cmd(dev, cmd);
4658 static int ata_standby_drive(struct ata_device *dev)
4660 return ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1);
4663 static int ata_start_drive(struct ata_device *dev)
4665 return ata_do_simple_cmd(dev, ATA_CMD_IDLEIMMEDIATE);
4669 * ata_device_resume - wakeup a previously suspended devices
4670 * @dev: the device to resume
4672 * Kick the drive back into action, by sending it an idle immediate
4673 * command and making sure its transfer mode matches between drive
4677 int ata_device_resume(struct ata_device *dev)
4679 struct ata_port *ap = dev->ap;
4681 if (ap->flags & ATA_FLAG_SUSPENDED) {
4682 struct ata_device *failed_dev;
4683 ap->flags &= ~ATA_FLAG_SUSPENDED;
4684 while (ata_set_mode(ap, &failed_dev))
4685 ata_dev_disable(failed_dev);
4687 if (!ata_dev_enabled(dev))
4689 if (dev->class == ATA_DEV_ATA)
4690 ata_start_drive(dev);
4696 * ata_device_suspend - prepare a device for suspend
4697 * @dev: the device to suspend
4699 * Flush the cache on the drive, if appropriate, then issue a
4700 * standbynow command.
4702 int ata_device_suspend(struct ata_device *dev, pm_message_t state)
4704 struct ata_port *ap = dev->ap;
4706 if (!ata_dev_enabled(dev))
4708 if (dev->class == ATA_DEV_ATA)
4709 ata_flush_cache(dev);
4711 if (state.event != PM_EVENT_FREEZE)
4712 ata_standby_drive(dev);
4713 ap->flags |= ATA_FLAG_SUSPENDED;
4718 * ata_port_start - Set port up for dma.
4719 * @ap: Port to initialize
4721 * Called just after data structures for each port are
4722 * initialized. Allocates space for PRD table.
4724 * May be used as the port_start() entry in ata_port_operations.
4727 * Inherited from caller.
4730 int ata_port_start (struct ata_port *ap)
4732 struct device *dev = ap->dev;
4735 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4739 rc = ata_pad_alloc(ap, dev);
4741 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4745 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4752 * ata_port_stop - Undo ata_port_start()
4753 * @ap: Port to shut down
4755 * Frees the PRD table.
4757 * May be used as the port_stop() entry in ata_port_operations.
4760 * Inherited from caller.
4763 void ata_port_stop (struct ata_port *ap)
4765 struct device *dev = ap->dev;
4767 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4768 ata_pad_free(ap, dev);
4771 void ata_host_stop (struct ata_host_set *host_set)
4773 if (host_set->mmio_base)
4774 iounmap(host_set->mmio_base);
4779 * ata_host_remove - Unregister SCSI host structure with upper layers
4780 * @ap: Port to unregister
4781 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4784 * Inherited from caller.
4787 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4789 struct Scsi_Host *sh = ap->host;
4794 scsi_remove_host(sh);
4796 ap->ops->port_stop(ap);
4800 * ata_host_init - Initialize an ata_port structure
4801 * @ap: Structure to initialize
4802 * @host: associated SCSI mid-layer structure
4803 * @host_set: Collection of hosts to which @ap belongs
4804 * @ent: Probe information provided by low-level driver
4805 * @port_no: Port number associated with this ata_port
4807 * Initialize a new ata_port structure, and its associated
4811 * Inherited from caller.
4814 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4815 struct ata_host_set *host_set,
4816 const struct ata_probe_ent *ent, unsigned int port_no)
4822 host->max_channel = 1;
4823 host->unique_id = ata_unique_id++;
4824 host->max_cmd_len = 12;
4826 ap->flags = ATA_FLAG_DISABLED;
4827 ap->id = host->unique_id;
4829 ap->ctl = ATA_DEVCTL_OBS;
4830 ap->host_set = host_set;
4832 ap->port_no = port_no;
4834 ent->legacy_mode ? ent->hard_port_no : port_no;
4835 ap->pio_mask = ent->pio_mask;
4836 ap->mwdma_mask = ent->mwdma_mask;
4837 ap->udma_mask = ent->udma_mask;
4838 ap->flags |= ent->host_flags;
4839 ap->ops = ent->port_ops;
4840 ap->sata_spd_limit = UINT_MAX;
4841 ap->active_tag = ATA_TAG_POISON;
4842 ap->last_ctl = 0xFF;
4844 INIT_WORK(&ap->port_task, NULL, NULL);
4845 INIT_LIST_HEAD(&ap->eh_done_q);
4847 /* set cable type */
4848 ap->cbl = ATA_CBL_NONE;
4849 if (ap->flags & ATA_FLAG_SATA)
4850 ap->cbl = ATA_CBL_SATA;
4852 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4853 struct ata_device *dev = &ap->device[i];
4856 dev->pio_mask = UINT_MAX;
4857 dev->mwdma_mask = UINT_MAX;
4858 dev->udma_mask = UINT_MAX;
4862 ap->stats.unhandled_irq = 1;
4863 ap->stats.idle_irq = 1;
4866 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4870 * ata_host_add - Attach low-level ATA driver to system
4871 * @ent: Information provided by low-level driver
4872 * @host_set: Collections of ports to which we add
4873 * @port_no: Port number associated with this host
4875 * Attach low-level ATA driver to system.
4878 * PCI/etc. bus probe sem.
4881 * New ata_port on success, for NULL on error.
4884 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4885 struct ata_host_set *host_set,
4886 unsigned int port_no)
4888 struct Scsi_Host *host;
4889 struct ata_port *ap;
4894 if (!ent->port_ops->probe_reset &&
4895 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
4896 printk(KERN_ERR "ata%u: no reset mechanism available\n",
4901 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4905 host->transportt = &ata_scsi_transport_template;
4907 ap = ata_shost_to_port(host);
4909 ata_host_init(ap, host, host_set, ent, port_no);
4911 rc = ap->ops->port_start(ap);
4918 scsi_host_put(host);
4923 * ata_device_add - Register hardware device with ATA and SCSI layers
4924 * @ent: Probe information describing hardware device to be registered
4926 * This function processes the information provided in the probe
4927 * information struct @ent, allocates the necessary ATA and SCSI
4928 * host information structures, initializes them, and registers
4929 * everything with requisite kernel subsystems.
4931 * This function requests irqs, probes the ATA bus, and probes
4935 * PCI/etc. bus probe sem.
4938 * Number of ports registered. Zero on error (no ports registered).
4941 int ata_device_add(const struct ata_probe_ent *ent)
4943 unsigned int count = 0, i;
4944 struct device *dev = ent->dev;
4945 struct ata_host_set *host_set;
4948 /* alloc a container for our list of ATA ports (buses) */
4949 host_set = kzalloc(sizeof(struct ata_host_set) +
4950 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4953 spin_lock_init(&host_set->lock);
4955 host_set->dev = dev;
4956 host_set->n_ports = ent->n_ports;
4957 host_set->irq = ent->irq;
4958 host_set->mmio_base = ent->mmio_base;
4959 host_set->private_data = ent->private_data;
4960 host_set->ops = ent->port_ops;
4961 host_set->flags = ent->host_set_flags;
4963 /* register each port bound to this device */
4964 for (i = 0; i < ent->n_ports; i++) {
4965 struct ata_port *ap;
4966 unsigned long xfer_mode_mask;
4968 ap = ata_host_add(ent, host_set, i);
4972 host_set->ports[i] = ap;
4973 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4974 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4975 (ap->pio_mask << ATA_SHIFT_PIO);
4977 /* print per-port info to dmesg */
4978 ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%lX "
4979 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
4980 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4981 ata_mode_string(xfer_mode_mask),
4982 ap->ioaddr.cmd_addr,
4983 ap->ioaddr.ctl_addr,
4984 ap->ioaddr.bmdma_addr,
4988 host_set->ops->irq_clear(ap);
4989 ata_eh_freeze_port(ap); /* freeze port before requesting IRQ */
4996 /* obtain irq, that is shared between channels */
4997 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4998 DRV_NAME, host_set))
5001 /* perform each probe synchronously */
5002 DPRINTK("probe begin\n");
5003 for (i = 0; i < count; i++) {
5004 struct ata_port *ap;
5007 ap = host_set->ports[i];
5009 DPRINTK("ata%u: bus probe begin\n", ap->id);
5010 rc = ata_bus_probe(ap);
5011 DPRINTK("ata%u: bus probe end\n", ap->id);
5014 /* FIXME: do something useful here?
5015 * Current libata behavior will
5016 * tear down everything when
5017 * the module is removed
5018 * or the h/w is unplugged.
5022 rc = scsi_add_host(ap->host, dev);
5024 ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
5025 /* FIXME: do something useful here */
5026 /* FIXME: handle unconditional calls to
5027 * scsi_scan_host and ata_host_remove, below,
5033 /* probes are done, now scan each port's disk(s) */
5034 DPRINTK("host probe begin\n");
5035 for (i = 0; i < count; i++) {
5036 struct ata_port *ap = host_set->ports[i];
5038 ata_scsi_scan_host(ap);
5041 dev_set_drvdata(dev, host_set);
5043 VPRINTK("EXIT, returning %u\n", ent->n_ports);
5044 return ent->n_ports; /* success */
5047 for (i = 0; i < count; i++) {
5048 ata_host_remove(host_set->ports[i], 1);
5049 scsi_host_put(host_set->ports[i]->host);
5053 VPRINTK("EXIT, returning 0\n");
5058 * ata_host_set_remove - PCI layer callback for device removal
5059 * @host_set: ATA host set that was removed
5061 * Unregister all objects associated with this host set. Free those
5065 * Inherited from calling layer (may sleep).
5068 void ata_host_set_remove(struct ata_host_set *host_set)
5070 struct ata_port *ap;
5073 for (i = 0; i < host_set->n_ports; i++) {
5074 ap = host_set->ports[i];
5075 scsi_remove_host(ap->host);
5078 free_irq(host_set->irq, host_set);
5080 for (i = 0; i < host_set->n_ports; i++) {
5081 ap = host_set->ports[i];
5083 ata_scsi_release(ap->host);
5085 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
5086 struct ata_ioports *ioaddr = &ap->ioaddr;
5088 if (ioaddr->cmd_addr == 0x1f0)
5089 release_region(0x1f0, 8);
5090 else if (ioaddr->cmd_addr == 0x170)
5091 release_region(0x170, 8);
5094 scsi_host_put(ap->host);
5097 if (host_set->ops->host_stop)
5098 host_set->ops->host_stop(host_set);
5104 * ata_scsi_release - SCSI layer callback hook for host unload
5105 * @host: libata host to be unloaded
5107 * Performs all duties necessary to shut down a libata port...
5108 * Kill port kthread, disable port, and release resources.
5111 * Inherited from SCSI layer.
5117 int ata_scsi_release(struct Scsi_Host *host)
5119 struct ata_port *ap = ata_shost_to_port(host);
5123 ap->ops->port_disable(ap);
5124 ata_host_remove(ap, 0);
5131 * ata_std_ports - initialize ioaddr with standard port offsets.
5132 * @ioaddr: IO address structure to be initialized
5134 * Utility function which initializes data_addr, error_addr,
5135 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5136 * device_addr, status_addr, and command_addr to standard offsets
5137 * relative to cmd_addr.
5139 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5142 void ata_std_ports(struct ata_ioports *ioaddr)
5144 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
5145 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
5146 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
5147 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
5148 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
5149 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
5150 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
5151 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
5152 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
5153 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
5159 void ata_pci_host_stop (struct ata_host_set *host_set)
5161 struct pci_dev *pdev = to_pci_dev(host_set->dev);
5163 pci_iounmap(pdev, host_set->mmio_base);
5167 * ata_pci_remove_one - PCI layer callback for device removal
5168 * @pdev: PCI device that was removed
5170 * PCI layer indicates to libata via this hook that
5171 * hot-unplug or module unload event has occurred.
5172 * Handle this by unregistering all objects associated
5173 * with this PCI device. Free those objects. Then finally
5174 * release PCI resources and disable device.
5177 * Inherited from PCI layer (may sleep).
5180 void ata_pci_remove_one (struct pci_dev *pdev)
5182 struct device *dev = pci_dev_to_dev(pdev);
5183 struct ata_host_set *host_set = dev_get_drvdata(dev);
5185 ata_host_set_remove(host_set);
5186 pci_release_regions(pdev);
5187 pci_disable_device(pdev);
5188 dev_set_drvdata(dev, NULL);
5191 /* move to PCI subsystem */
5192 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
5194 unsigned long tmp = 0;
5196 switch (bits->width) {
5199 pci_read_config_byte(pdev, bits->reg, &tmp8);
5205 pci_read_config_word(pdev, bits->reg, &tmp16);
5211 pci_read_config_dword(pdev, bits->reg, &tmp32);
5222 return (tmp == bits->val) ? 1 : 0;
5225 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
5227 pci_save_state(pdev);
5228 pci_disable_device(pdev);
5229 pci_set_power_state(pdev, PCI_D3hot);
5233 int ata_pci_device_resume(struct pci_dev *pdev)
5235 pci_set_power_state(pdev, PCI_D0);
5236 pci_restore_state(pdev);
5237 pci_enable_device(pdev);
5238 pci_set_master(pdev);
5241 #endif /* CONFIG_PCI */
5244 static int __init ata_init(void)
5246 ata_wq = create_workqueue("ata");
5250 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5254 static void __exit ata_exit(void)
5256 destroy_workqueue(ata_wq);
5259 module_init(ata_init);
5260 module_exit(ata_exit);
5262 static unsigned long ratelimit_time;
5263 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5265 int ata_ratelimit(void)
5268 unsigned long flags;
5270 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5272 if (time_after(jiffies, ratelimit_time)) {
5274 ratelimit_time = jiffies + (HZ/5);
5278 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5284 * ata_wait_register - wait until register value changes
5285 * @reg: IO-mapped register
5286 * @mask: Mask to apply to read register value
5287 * @val: Wait condition
5288 * @interval_msec: polling interval in milliseconds
5289 * @timeout_msec: timeout in milliseconds
5291 * Waiting for some bits of register to change is a common
5292 * operation for ATA controllers. This function reads 32bit LE
5293 * IO-mapped register @reg and tests for the following condition.
5295 * (*@reg & mask) != val
5297 * If the condition is met, it returns; otherwise, the process is
5298 * repeated after @interval_msec until timeout.
5301 * Kernel thread context (may sleep)
5304 * The final register value.
5306 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
5307 unsigned long interval_msec,
5308 unsigned long timeout_msec)
5310 unsigned long timeout;
5313 tmp = ioread32(reg);
5315 /* Calculate timeout _after_ the first read to make sure
5316 * preceding writes reach the controller before starting to
5317 * eat away the timeout.
5319 timeout = jiffies + (timeout_msec * HZ) / 1000;
5321 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
5322 msleep(interval_msec);
5323 tmp = ioread32(reg);
5330 * libata is essentially a library of internal helper functions for
5331 * low-level ATA host controller drivers. As such, the API/ABI is
5332 * likely to change as new drivers are added and updated.
5333 * Do not depend on ABI/API stability.
5336 EXPORT_SYMBOL_GPL(ata_std_bios_param);
5337 EXPORT_SYMBOL_GPL(ata_std_ports);
5338 EXPORT_SYMBOL_GPL(ata_device_add);
5339 EXPORT_SYMBOL_GPL(ata_host_set_remove);
5340 EXPORT_SYMBOL_GPL(ata_sg_init);
5341 EXPORT_SYMBOL_GPL(ata_sg_init_one);
5342 EXPORT_SYMBOL_GPL(ata_qc_complete);
5343 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
5344 EXPORT_SYMBOL_GPL(ata_tf_load);
5345 EXPORT_SYMBOL_GPL(ata_tf_read);
5346 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5347 EXPORT_SYMBOL_GPL(ata_std_dev_select);
5348 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5349 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5350 EXPORT_SYMBOL_GPL(ata_check_status);
5351 EXPORT_SYMBOL_GPL(ata_altstatus);
5352 EXPORT_SYMBOL_GPL(ata_exec_command);
5353 EXPORT_SYMBOL_GPL(ata_port_start);
5354 EXPORT_SYMBOL_GPL(ata_port_stop);
5355 EXPORT_SYMBOL_GPL(ata_host_stop);
5356 EXPORT_SYMBOL_GPL(ata_interrupt);
5357 EXPORT_SYMBOL_GPL(ata_qc_prep);
5358 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
5359 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5360 EXPORT_SYMBOL_GPL(ata_bmdma_start);
5361 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5362 EXPORT_SYMBOL_GPL(ata_bmdma_status);
5363 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5364 EXPORT_SYMBOL_GPL(ata_port_probe);
5365 EXPORT_SYMBOL_GPL(sata_set_spd);
5366 EXPORT_SYMBOL_GPL(sata_phy_reset);
5367 EXPORT_SYMBOL_GPL(__sata_phy_reset);
5368 EXPORT_SYMBOL_GPL(ata_bus_reset);
5369 EXPORT_SYMBOL_GPL(ata_std_probeinit);
5370 EXPORT_SYMBOL_GPL(ata_std_softreset);
5371 EXPORT_SYMBOL_GPL(sata_std_hardreset);
5372 EXPORT_SYMBOL_GPL(ata_std_postreset);
5373 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5374 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5375 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
5376 EXPORT_SYMBOL_GPL(ata_dev_classify);
5377 EXPORT_SYMBOL_GPL(ata_dev_pair);
5378 EXPORT_SYMBOL_GPL(ata_port_disable);
5379 EXPORT_SYMBOL_GPL(ata_ratelimit);
5380 EXPORT_SYMBOL_GPL(ata_wait_register);
5381 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5382 EXPORT_SYMBOL_GPL(ata_port_queue_task);
5383 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5384 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5385 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5386 EXPORT_SYMBOL_GPL(ata_scsi_release);
5387 EXPORT_SYMBOL_GPL(ata_host_intr);
5388 EXPORT_SYMBOL_GPL(sata_scr_valid);
5389 EXPORT_SYMBOL_GPL(sata_scr_read);
5390 EXPORT_SYMBOL_GPL(sata_scr_write);
5391 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
5392 EXPORT_SYMBOL_GPL(ata_port_online);
5393 EXPORT_SYMBOL_GPL(ata_port_offline);
5394 EXPORT_SYMBOL_GPL(ata_id_string);
5395 EXPORT_SYMBOL_GPL(ata_id_c_string);
5396 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5398 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5399 EXPORT_SYMBOL_GPL(ata_timing_compute);
5400 EXPORT_SYMBOL_GPL(ata_timing_merge);
5403 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5404 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5405 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5406 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5407 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5408 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5409 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5410 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
5411 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
5412 #endif /* CONFIG_PCI */
5414 EXPORT_SYMBOL_GPL(ata_device_suspend);
5415 EXPORT_SYMBOL_GPL(ata_device_resume);
5416 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5417 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
5419 EXPORT_SYMBOL_GPL(ata_eng_timeout);
5420 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
5421 EXPORT_SYMBOL_GPL(ata_port_abort);
5422 EXPORT_SYMBOL_GPL(ata_port_freeze);
5423 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
5424 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
5425 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5426 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);