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_port *ap,
65 struct ata_device *dev);
66 static void ata_set_mode(struct ata_port *ap);
67 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
68 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev);
70 static unsigned int ata_unique_id = 1;
71 static struct workqueue_struct *ata_wq;
73 int atapi_enabled = 1;
74 module_param(atapi_enabled, int, 0444);
75 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
78 module_param_named(fua, libata_fua, int, 0444);
79 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
81 MODULE_AUTHOR("Jeff Garzik");
82 MODULE_DESCRIPTION("Library module for ATA devices");
83 MODULE_LICENSE("GPL");
84 MODULE_VERSION(DRV_VERSION);
88 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
89 * @tf: Taskfile to convert
90 * @fis: Buffer into which data will output
91 * @pmp: Port multiplier port
93 * Converts a standard ATA taskfile to a Serial ATA
94 * FIS structure (Register - Host to Device).
97 * Inherited from caller.
100 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
102 fis[0] = 0x27; /* Register - Host to Device FIS */
103 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
104 bit 7 indicates Command FIS */
105 fis[2] = tf->command;
106 fis[3] = tf->feature;
113 fis[8] = tf->hob_lbal;
114 fis[9] = tf->hob_lbam;
115 fis[10] = tf->hob_lbah;
116 fis[11] = tf->hob_feature;
119 fis[13] = tf->hob_nsect;
130 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
131 * @fis: Buffer from which data will be input
132 * @tf: Taskfile to output
134 * Converts a serial ATA FIS structure to a standard ATA taskfile.
137 * Inherited from caller.
140 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
142 tf->command = fis[2]; /* status */
143 tf->feature = fis[3]; /* error */
150 tf->hob_lbal = fis[8];
151 tf->hob_lbam = fis[9];
152 tf->hob_lbah = fis[10];
155 tf->hob_nsect = fis[13];
158 static const u8 ata_rw_cmds[] = {
162 ATA_CMD_READ_MULTI_EXT,
163 ATA_CMD_WRITE_MULTI_EXT,
167 ATA_CMD_WRITE_MULTI_FUA_EXT,
171 ATA_CMD_PIO_READ_EXT,
172 ATA_CMD_PIO_WRITE_EXT,
185 ATA_CMD_WRITE_FUA_EXT
189 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
190 * @qc: command to examine and configure
192 * Examine the device configuration and tf->flags to calculate
193 * the proper read/write commands and protocol to use.
198 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
200 struct ata_taskfile *tf = &qc->tf;
201 struct ata_device *dev = qc->dev;
204 int index, fua, lba48, write;
206 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
207 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
208 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
210 if (dev->flags & ATA_DFLAG_PIO) {
211 tf->protocol = ATA_PROT_PIO;
212 index = dev->multi_count ? 0 : 8;
213 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
214 /* Unable to use DMA due to host limitation */
215 tf->protocol = ATA_PROT_PIO;
216 index = dev->multi_count ? 0 : 8;
218 tf->protocol = ATA_PROT_DMA;
222 cmd = ata_rw_cmds[index + fua + lba48 + write];
231 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
232 * @pio_mask: pio_mask
233 * @mwdma_mask: mwdma_mask
234 * @udma_mask: udma_mask
236 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
237 * unsigned int xfer_mask.
245 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
246 unsigned int mwdma_mask,
247 unsigned int udma_mask)
249 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
250 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
251 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
255 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
256 * @xfer_mask: xfer_mask to unpack
257 * @pio_mask: resulting pio_mask
258 * @mwdma_mask: resulting mwdma_mask
259 * @udma_mask: resulting udma_mask
261 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
262 * Any NULL distination masks will be ignored.
264 static void ata_unpack_xfermask(unsigned int xfer_mask,
265 unsigned int *pio_mask,
266 unsigned int *mwdma_mask,
267 unsigned int *udma_mask)
270 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
272 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
274 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
277 static const struct ata_xfer_ent {
278 unsigned int shift, bits;
281 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
282 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
283 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
288 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
289 * @xfer_mask: xfer_mask of interest
291 * Return matching XFER_* value for @xfer_mask. Only the highest
292 * bit of @xfer_mask is considered.
298 * Matching XFER_* value, 0 if no match found.
300 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
302 int highbit = fls(xfer_mask) - 1;
303 const struct ata_xfer_ent *ent;
305 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
306 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
307 return ent->base + highbit - ent->shift;
312 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
313 * @xfer_mode: XFER_* of interest
315 * Return matching xfer_mask for @xfer_mode.
321 * Matching xfer_mask, 0 if no match found.
323 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
325 const struct ata_xfer_ent *ent;
327 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
328 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
329 return 1 << (ent->shift + xfer_mode - ent->base);
334 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
335 * @xfer_mode: XFER_* of interest
337 * Return matching xfer_shift for @xfer_mode.
343 * Matching xfer_shift, -1 if no match found.
345 static int ata_xfer_mode2shift(unsigned int xfer_mode)
347 const struct ata_xfer_ent *ent;
349 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
350 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
356 * ata_mode_string - convert xfer_mask to string
357 * @xfer_mask: mask of bits supported; only highest bit counts.
359 * Determine string which represents the highest speed
360 * (highest bit in @modemask).
366 * Constant C string representing highest speed listed in
367 * @mode_mask, or the constant C string "<n/a>".
369 static const char *ata_mode_string(unsigned int xfer_mask)
371 static const char * const xfer_mode_str[] = {
391 highbit = fls(xfer_mask) - 1;
392 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
393 return xfer_mode_str[highbit];
397 static void ata_dev_disable(struct ata_port *ap, struct ata_device *dev)
399 if (ata_dev_present(dev)) {
400 printk(KERN_WARNING "ata%u: dev %u disabled\n",
407 * ata_pio_devchk - PATA device presence detection
408 * @ap: ATA channel to examine
409 * @device: Device to examine (starting at zero)
411 * This technique was originally described in
412 * Hale Landis's ATADRVR (www.ata-atapi.com), and
413 * later found its way into the ATA/ATAPI spec.
415 * Write a pattern to the ATA shadow registers,
416 * and if a device is present, it will respond by
417 * correctly storing and echoing back the
418 * ATA shadow register contents.
424 static unsigned int ata_pio_devchk(struct ata_port *ap,
427 struct ata_ioports *ioaddr = &ap->ioaddr;
430 ap->ops->dev_select(ap, device);
432 outb(0x55, ioaddr->nsect_addr);
433 outb(0xaa, ioaddr->lbal_addr);
435 outb(0xaa, ioaddr->nsect_addr);
436 outb(0x55, ioaddr->lbal_addr);
438 outb(0x55, ioaddr->nsect_addr);
439 outb(0xaa, ioaddr->lbal_addr);
441 nsect = inb(ioaddr->nsect_addr);
442 lbal = inb(ioaddr->lbal_addr);
444 if ((nsect == 0x55) && (lbal == 0xaa))
445 return 1; /* we found a device */
447 return 0; /* nothing found */
451 * ata_mmio_devchk - PATA device presence detection
452 * @ap: ATA channel to examine
453 * @device: Device to examine (starting at zero)
455 * This technique was originally described in
456 * Hale Landis's ATADRVR (www.ata-atapi.com), and
457 * later found its way into the ATA/ATAPI spec.
459 * Write a pattern to the ATA shadow registers,
460 * and if a device is present, it will respond by
461 * correctly storing and echoing back the
462 * ATA shadow register contents.
468 static unsigned int ata_mmio_devchk(struct ata_port *ap,
471 struct ata_ioports *ioaddr = &ap->ioaddr;
474 ap->ops->dev_select(ap, device);
476 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
477 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
479 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
480 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
482 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
483 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
485 nsect = readb((void __iomem *) ioaddr->nsect_addr);
486 lbal = readb((void __iomem *) ioaddr->lbal_addr);
488 if ((nsect == 0x55) && (lbal == 0xaa))
489 return 1; /* we found a device */
491 return 0; /* nothing found */
495 * ata_devchk - PATA device presence detection
496 * @ap: ATA channel to examine
497 * @device: Device to examine (starting at zero)
499 * Dispatch ATA device presence detection, depending
500 * on whether we are using PIO or MMIO to talk to the
501 * ATA shadow registers.
507 static unsigned int ata_devchk(struct ata_port *ap,
510 if (ap->flags & ATA_FLAG_MMIO)
511 return ata_mmio_devchk(ap, device);
512 return ata_pio_devchk(ap, device);
516 * ata_dev_classify - determine device type based on ATA-spec signature
517 * @tf: ATA taskfile register set for device to be identified
519 * Determine from taskfile register contents whether a device is
520 * ATA or ATAPI, as per "Signature and persistence" section
521 * of ATA/PI spec (volume 1, sect 5.14).
527 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
528 * the event of failure.
531 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
533 /* Apple's open source Darwin code hints that some devices only
534 * put a proper signature into the LBA mid/high registers,
535 * So, we only check those. It's sufficient for uniqueness.
538 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
539 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
540 DPRINTK("found ATA device by sig\n");
544 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
545 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
546 DPRINTK("found ATAPI device by sig\n");
547 return ATA_DEV_ATAPI;
550 DPRINTK("unknown device\n");
551 return ATA_DEV_UNKNOWN;
555 * ata_dev_try_classify - Parse returned ATA device signature
556 * @ap: ATA channel to examine
557 * @device: Device to examine (starting at zero)
558 * @r_err: Value of error register on completion
560 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
561 * an ATA/ATAPI-defined set of values is placed in the ATA
562 * shadow registers, indicating the results of device detection
565 * Select the ATA device, and read the values from the ATA shadow
566 * registers. Then parse according to the Error register value,
567 * and the spec-defined values examined by ata_dev_classify().
573 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
577 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
579 struct ata_taskfile tf;
583 ap->ops->dev_select(ap, device);
585 memset(&tf, 0, sizeof(tf));
587 ap->ops->tf_read(ap, &tf);
592 /* see if device passed diags */
595 else if ((device == 0) && (err == 0x81))
600 /* determine if device is ATA or ATAPI */
601 class = ata_dev_classify(&tf);
603 if (class == ATA_DEV_UNKNOWN)
605 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
611 * ata_id_string - Convert IDENTIFY DEVICE page into string
612 * @id: IDENTIFY DEVICE results we will examine
613 * @s: string into which data is output
614 * @ofs: offset into identify device page
615 * @len: length of string to return. must be an even number.
617 * The strings in the IDENTIFY DEVICE page are broken up into
618 * 16-bit chunks. Run through the string, and output each
619 * 8-bit chunk linearly, regardless of platform.
625 void ata_id_string(const u16 *id, unsigned char *s,
626 unsigned int ofs, unsigned int len)
645 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
646 * @id: IDENTIFY DEVICE results we will examine
647 * @s: string into which data is output
648 * @ofs: offset into identify device page
649 * @len: length of string to return. must be an odd number.
651 * This function is identical to ata_id_string except that it
652 * trims trailing spaces and terminates the resulting string with
653 * null. @len must be actual maximum length (even number) + 1.
658 void ata_id_c_string(const u16 *id, unsigned char *s,
659 unsigned int ofs, unsigned int len)
665 ata_id_string(id, s, ofs, len - 1);
667 p = s + strnlen(s, len - 1);
668 while (p > s && p[-1] == ' ')
673 static u64 ata_id_n_sectors(const u16 *id)
675 if (ata_id_has_lba(id)) {
676 if (ata_id_has_lba48(id))
677 return ata_id_u64(id, 100);
679 return ata_id_u32(id, 60);
681 if (ata_id_current_chs_valid(id))
682 return ata_id_u32(id, 57);
684 return id[1] * id[3] * id[6];
689 * ata_noop_dev_select - Select device 0/1 on ATA bus
690 * @ap: ATA channel to manipulate
691 * @device: ATA device (numbered from zero) to select
693 * This function performs no actual function.
695 * May be used as the dev_select() entry in ata_port_operations.
700 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
706 * ata_std_dev_select - Select device 0/1 on ATA bus
707 * @ap: ATA channel to manipulate
708 * @device: ATA device (numbered from zero) to select
710 * Use the method defined in the ATA specification to
711 * make either device 0, or device 1, active on the
712 * ATA channel. Works with both PIO and MMIO.
714 * May be used as the dev_select() entry in ata_port_operations.
720 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
725 tmp = ATA_DEVICE_OBS;
727 tmp = ATA_DEVICE_OBS | ATA_DEV1;
729 if (ap->flags & ATA_FLAG_MMIO) {
730 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
732 outb(tmp, ap->ioaddr.device_addr);
734 ata_pause(ap); /* needed; also flushes, for mmio */
738 * ata_dev_select - Select device 0/1 on ATA bus
739 * @ap: ATA channel to manipulate
740 * @device: ATA device (numbered from zero) to select
741 * @wait: non-zero to wait for Status register BSY bit to clear
742 * @can_sleep: non-zero if context allows sleeping
744 * Use the method defined in the ATA specification to
745 * make either device 0, or device 1, active on the
748 * This is a high-level version of ata_std_dev_select(),
749 * which additionally provides the services of inserting
750 * the proper pauses and status polling, where needed.
756 void ata_dev_select(struct ata_port *ap, unsigned int device,
757 unsigned int wait, unsigned int can_sleep)
759 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
760 ap->id, device, wait);
765 ap->ops->dev_select(ap, device);
768 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
775 * ata_dump_id - IDENTIFY DEVICE info debugging output
776 * @id: IDENTIFY DEVICE page to dump
778 * Dump selected 16-bit words from the given IDENTIFY DEVICE
785 static inline void ata_dump_id(const u16 *id)
787 DPRINTK("49==0x%04x "
797 DPRINTK("80==0x%04x "
807 DPRINTK("88==0x%04x "
814 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
815 * @id: IDENTIFY data to compute xfer mask from
817 * Compute the xfermask for this device. This is not as trivial
818 * as it seems if we must consider early devices correctly.
820 * FIXME: pre IDE drive timing (do we care ?).
828 static unsigned int ata_id_xfermask(const u16 *id)
830 unsigned int pio_mask, mwdma_mask, udma_mask;
832 /* Usual case. Word 53 indicates word 64 is valid */
833 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
834 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
838 /* If word 64 isn't valid then Word 51 high byte holds
839 * the PIO timing number for the maximum. Turn it into
842 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
844 /* But wait.. there's more. Design your standards by
845 * committee and you too can get a free iordy field to
846 * process. However its the speeds not the modes that
847 * are supported... Note drivers using the timing API
848 * will get this right anyway
852 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
855 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
856 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
858 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
862 * ata_port_queue_task - Queue port_task
863 * @ap: The ata_port to queue port_task for
865 * Schedule @fn(@data) for execution after @delay jiffies using
866 * port_task. There is one port_task per port and it's the
867 * user(low level driver)'s responsibility to make sure that only
868 * one task is active at any given time.
870 * libata core layer takes care of synchronization between
871 * port_task and EH. ata_port_queue_task() may be ignored for EH
875 * Inherited from caller.
877 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
882 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
885 PREPARE_WORK(&ap->port_task, fn, data);
888 rc = queue_work(ata_wq, &ap->port_task);
890 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
892 /* rc == 0 means that another user is using port task */
897 * ata_port_flush_task - Flush port_task
898 * @ap: The ata_port to flush port_task for
900 * After this function completes, port_task is guranteed not to
901 * be running or scheduled.
904 * Kernel thread context (may sleep)
906 void ata_port_flush_task(struct ata_port *ap)
912 spin_lock_irqsave(&ap->host_set->lock, flags);
913 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
914 spin_unlock_irqrestore(&ap->host_set->lock, flags);
916 DPRINTK("flush #1\n");
917 flush_workqueue(ata_wq);
920 * At this point, if a task is running, it's guaranteed to see
921 * the FLUSH flag; thus, it will never queue pio tasks again.
924 if (!cancel_delayed_work(&ap->port_task)) {
925 DPRINTK("flush #2\n");
926 flush_workqueue(ata_wq);
929 spin_lock_irqsave(&ap->host_set->lock, flags);
930 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
931 spin_unlock_irqrestore(&ap->host_set->lock, flags);
936 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
938 struct completion *waiting = qc->private_data;
940 qc->ap->ops->tf_read(qc->ap, &qc->tf);
945 * ata_exec_internal - execute libata internal command
946 * @ap: Port to which the command is sent
947 * @dev: Device to which the command is sent
948 * @tf: Taskfile registers for the command and the result
949 * @dma_dir: Data tranfer direction of the command
950 * @buf: Data buffer of the command
951 * @buflen: Length of data buffer
953 * Executes libata internal command with timeout. @tf contains
954 * command on entry and result on return. Timeout and error
955 * conditions are reported via return value. No recovery action
956 * is taken after a command times out. It's caller's duty to
957 * clean up after timeout.
960 * None. Should be called with kernel context, might sleep.
964 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
965 struct ata_taskfile *tf,
966 int dma_dir, void *buf, unsigned int buflen)
968 u8 command = tf->command;
969 struct ata_queued_cmd *qc;
970 DECLARE_COMPLETION(wait);
972 unsigned int err_mask;
974 spin_lock_irqsave(&ap->host_set->lock, flags);
976 qc = ata_qc_new_init(ap, dev);
980 qc->dma_dir = dma_dir;
981 if (dma_dir != DMA_NONE) {
982 ata_sg_init_one(qc, buf, buflen);
983 qc->nsect = buflen / ATA_SECT_SIZE;
986 qc->private_data = &wait;
987 qc->complete_fn = ata_qc_complete_internal;
989 qc->err_mask = ata_qc_issue(qc);
993 spin_unlock_irqrestore(&ap->host_set->lock, flags);
995 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
996 ata_port_flush_task(ap);
998 spin_lock_irqsave(&ap->host_set->lock, flags);
1000 /* We're racing with irq here. If we lose, the
1001 * following test prevents us from completing the qc
1002 * again. If completion irq occurs after here but
1003 * before the caller cleans up, it will result in a
1004 * spurious interrupt. We can live with that.
1006 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1007 qc->err_mask = AC_ERR_TIMEOUT;
1008 ata_qc_complete(qc);
1009 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
1013 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1017 err_mask = qc->err_mask;
1021 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1022 * Until those drivers are fixed, we detect the condition
1023 * here, fail the command with AC_ERR_SYSTEM and reenable the
1026 * Note that this doesn't change any behavior as internal
1027 * command failure results in disabling the device in the
1028 * higher layer for LLDDs without new reset/EH callbacks.
1030 * Kill the following code as soon as those drivers are fixed.
1032 if (ap->flags & ATA_FLAG_PORT_DISABLED) {
1033 err_mask |= AC_ERR_SYSTEM;
1041 * ata_pio_need_iordy - check if iordy needed
1044 * Check if the current speed of the device requires IORDY. Used
1045 * by various controllers for chip configuration.
1048 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1051 int speed = adev->pio_mode - XFER_PIO_0;
1058 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1060 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1061 pio = adev->id[ATA_ID_EIDE_PIO];
1062 /* Is the speed faster than the drive allows non IORDY ? */
1064 /* This is cycle times not frequency - watch the logic! */
1065 if (pio > 240) /* PIO2 is 240nS per cycle */
1074 * ata_dev_read_id - Read ID data from the specified device
1075 * @ap: port on which target device resides
1076 * @dev: target device
1077 * @p_class: pointer to class of the target device (may be changed)
1078 * @post_reset: is this read ID post-reset?
1079 * @p_id: read IDENTIFY page (newly allocated)
1081 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1082 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1083 * devices. This function also takes care of EDD signature
1084 * misreporting (to be removed once EDD support is gone) and
1085 * issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
1088 * Kernel thread context (may sleep)
1091 * 0 on success, -errno otherwise.
1093 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
1094 unsigned int *p_class, int post_reset, u16 **p_id)
1096 unsigned int class = *p_class;
1097 unsigned int using_edd;
1098 struct ata_taskfile tf;
1099 unsigned int err_mask = 0;
1104 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1106 if (ap->ops->probe_reset ||
1107 ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
1112 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1114 id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
1117 reason = "out of memory";
1122 ata_tf_init(ap, &tf, dev->devno);
1126 tf.command = ATA_CMD_ID_ATA;
1129 tf.command = ATA_CMD_ID_ATAPI;
1133 reason = "unsupported class";
1137 tf.protocol = ATA_PROT_PIO;
1139 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
1140 id, sizeof(id[0]) * ATA_ID_WORDS);
1144 reason = "I/O error";
1146 if (err_mask & ~AC_ERR_DEV)
1150 * arg! EDD works for all test cases, but seems to return
1151 * the ATA signature for some ATAPI devices. Until the
1152 * reason for this is found and fixed, we fix up the mess
1153 * here. If IDENTIFY DEVICE returns command aborted
1154 * (as ATAPI devices do), then we issue an
1155 * IDENTIFY PACKET DEVICE.
1157 * ATA software reset (SRST, the default) does not appear
1158 * to have this problem.
1160 if ((using_edd) && (class == ATA_DEV_ATA)) {
1161 u8 err = tf.feature;
1162 if (err & ATA_ABORTED) {
1163 class = ATA_DEV_ATAPI;
1170 swap_buf_le16(id, ATA_ID_WORDS);
1173 if ((class == ATA_DEV_ATA) != ata_id_is_ata(id)) {
1175 reason = "device reports illegal type";
1179 if (post_reset && class == ATA_DEV_ATA) {
1181 * The exact sequence expected by certain pre-ATA4 drives is:
1184 * INITIALIZE DEVICE PARAMETERS
1186 * Some drives were very specific about that exact sequence.
1188 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1189 err_mask = ata_dev_init_params(ap, dev);
1192 reason = "INIT_DEV_PARAMS failed";
1196 /* current CHS translation info (id[53-58]) might be
1197 * changed. reread the identify device info.
1209 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1210 ap->id, dev->devno, reason);
1215 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1216 struct ata_device *dev)
1218 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1222 * ata_dev_configure - Configure the specified ATA/ATAPI device
1223 * @ap: Port on which target device resides
1224 * @dev: Target device to configure
1225 * @print_info: Enable device info printout
1227 * Configure @dev according to @dev->id. Generic and low-level
1228 * driver specific fixups are also applied.
1231 * Kernel thread context (may sleep)
1234 * 0 on success, -errno otherwise
1236 static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
1239 const u16 *id = dev->id;
1240 unsigned int xfer_mask;
1243 if (!ata_dev_present(dev)) {
1244 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1245 ap->id, dev->devno);
1249 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1251 /* print device capabilities */
1253 printk(KERN_DEBUG "ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1254 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1255 ap->id, dev->devno, id[49], id[82], id[83],
1256 id[84], id[85], id[86], id[87], id[88]);
1258 /* initialize to-be-configured parameters */
1260 dev->max_sectors = 0;
1268 * common ATA, ATAPI feature tests
1271 /* find max transfer mode; for printk only */
1272 xfer_mask = ata_id_xfermask(id);
1276 /* ATA-specific feature tests */
1277 if (dev->class == ATA_DEV_ATA) {
1278 dev->n_sectors = ata_id_n_sectors(id);
1280 if (ata_id_has_lba(id)) {
1281 const char *lba_desc;
1284 dev->flags |= ATA_DFLAG_LBA;
1285 if (ata_id_has_lba48(id)) {
1286 dev->flags |= ATA_DFLAG_LBA48;
1290 /* print device info to dmesg */
1292 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1293 "max %s, %Lu sectors: %s\n",
1295 ata_id_major_version(id),
1296 ata_mode_string(xfer_mask),
1297 (unsigned long long)dev->n_sectors,
1302 /* Default translation */
1303 dev->cylinders = id[1];
1305 dev->sectors = id[6];
1307 if (ata_id_current_chs_valid(id)) {
1308 /* Current CHS translation is valid. */
1309 dev->cylinders = id[54];
1310 dev->heads = id[55];
1311 dev->sectors = id[56];
1314 /* print device info to dmesg */
1316 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1317 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1319 ata_id_major_version(id),
1320 ata_mode_string(xfer_mask),
1321 (unsigned long long)dev->n_sectors,
1322 dev->cylinders, dev->heads, dev->sectors);
1328 /* ATAPI-specific feature tests */
1329 else if (dev->class == ATA_DEV_ATAPI) {
1330 rc = atapi_cdb_len(id);
1331 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1332 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1336 dev->cdb_len = (unsigned int) rc;
1338 /* print device info to dmesg */
1340 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1341 ap->id, dev->devno, ata_mode_string(xfer_mask));
1344 ap->host->max_cmd_len = 0;
1345 for (i = 0; i < ATA_MAX_DEVICES; i++)
1346 ap->host->max_cmd_len = max_t(unsigned int,
1347 ap->host->max_cmd_len,
1348 ap->device[i].cdb_len);
1350 /* limit bridge transfers to udma5, 200 sectors */
1351 if (ata_dev_knobble(ap, dev)) {
1353 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1354 ap->id, dev->devno);
1355 dev->udma_mask &= ATA_UDMA5;
1356 dev->max_sectors = ATA_MAX_SECTORS;
1359 if (ap->ops->dev_config)
1360 ap->ops->dev_config(ap, dev);
1362 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1366 printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
1367 ap->id, dev->devno);
1368 DPRINTK("EXIT, err\n");
1373 * ata_bus_probe - Reset and probe ATA bus
1376 * Master ATA bus probing function. Initiates a hardware-dependent
1377 * bus reset, then attempts to identify any devices found on
1381 * PCI/etc. bus probe sem.
1384 * Zero on success, non-zero on error.
1387 static int ata_bus_probe(struct ata_port *ap)
1389 unsigned int classes[ATA_MAX_DEVICES];
1390 unsigned int i, rc, found = 0;
1394 /* reset and determine device classes */
1395 for (i = 0; i < ATA_MAX_DEVICES; i++)
1396 classes[i] = ATA_DEV_UNKNOWN;
1398 if (ap->ops->probe_reset) {
1399 rc = ap->ops->probe_reset(ap, classes);
1401 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1405 ap->ops->phy_reset(ap);
1407 if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
1408 for (i = 0; i < ATA_MAX_DEVICES; i++)
1409 classes[i] = ap->device[i].class;
1414 for (i = 0; i < ATA_MAX_DEVICES; i++)
1415 if (classes[i] == ATA_DEV_UNKNOWN)
1416 classes[i] = ATA_DEV_NONE;
1418 /* read IDENTIFY page and configure devices */
1419 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1420 struct ata_device *dev = &ap->device[i];
1422 dev->class = classes[i];
1424 if (!ata_dev_present(dev))
1427 WARN_ON(dev->id != NULL);
1428 if (ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id)) {
1429 dev->class = ATA_DEV_NONE;
1433 if (ata_dev_configure(ap, dev, 1)) {
1434 dev->class++; /* disable device */
1442 goto err_out_disable;
1445 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1446 goto err_out_disable;
1451 ap->ops->port_disable(ap);
1456 * ata_port_probe - Mark port as enabled
1457 * @ap: Port for which we indicate enablement
1459 * Modify @ap data structure such that the system
1460 * thinks that the entire port is enabled.
1462 * LOCKING: host_set lock, or some other form of
1466 void ata_port_probe(struct ata_port *ap)
1468 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1472 * sata_print_link_status - Print SATA link status
1473 * @ap: SATA port to printk link status about
1475 * This function prints link speed and status of a SATA link.
1480 static void sata_print_link_status(struct ata_port *ap)
1485 if (!ap->ops->scr_read)
1488 sstatus = scr_read(ap, SCR_STATUS);
1490 if (sata_dev_present(ap)) {
1491 tmp = (sstatus >> 4) & 0xf;
1494 else if (tmp & (1 << 1))
1497 speed = "<unknown>";
1498 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1499 ap->id, speed, sstatus);
1501 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1507 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1508 * @ap: SATA port associated with target SATA PHY.
1510 * This function issues commands to standard SATA Sxxx
1511 * PHY registers, to wake up the phy (and device), and
1512 * clear any reset condition.
1515 * PCI/etc. bus probe sem.
1518 void __sata_phy_reset(struct ata_port *ap)
1521 unsigned long timeout = jiffies + (HZ * 5);
1523 if (ap->flags & ATA_FLAG_SATA_RESET) {
1524 /* issue phy wake/reset */
1525 scr_write_flush(ap, SCR_CONTROL, 0x301);
1526 /* Couldn't find anything in SATA I/II specs, but
1527 * AHCI-1.1 10.4.2 says at least 1 ms. */
1530 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1532 /* wait for phy to become ready, if necessary */
1535 sstatus = scr_read(ap, SCR_STATUS);
1536 if ((sstatus & 0xf) != 1)
1538 } while (time_before(jiffies, timeout));
1540 /* print link status */
1541 sata_print_link_status(ap);
1543 /* TODO: phy layer with polling, timeouts, etc. */
1544 if (sata_dev_present(ap))
1547 ata_port_disable(ap);
1549 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1552 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1553 ata_port_disable(ap);
1557 ap->cbl = ATA_CBL_SATA;
1561 * sata_phy_reset - Reset SATA bus.
1562 * @ap: SATA port associated with target SATA PHY.
1564 * This function resets the SATA bus, and then probes
1565 * the bus for devices.
1568 * PCI/etc. bus probe sem.
1571 void sata_phy_reset(struct ata_port *ap)
1573 __sata_phy_reset(ap);
1574 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1580 * ata_port_disable - Disable port.
1581 * @ap: Port to be disabled.
1583 * Modify @ap data structure such that the system
1584 * thinks that the entire port is disabled, and should
1585 * never attempt to probe or communicate with devices
1588 * LOCKING: host_set lock, or some other form of
1592 void ata_port_disable(struct ata_port *ap)
1594 ap->device[0].class = ATA_DEV_NONE;
1595 ap->device[1].class = ATA_DEV_NONE;
1596 ap->flags |= ATA_FLAG_PORT_DISABLED;
1600 * This mode timing computation functionality is ported over from
1601 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1604 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1605 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1606 * for PIO 5, which is a nonstandard extension and UDMA6, which
1607 * is currently supported only by Maxtor drives.
1610 static const struct ata_timing ata_timing[] = {
1612 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1613 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1614 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1615 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1617 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1618 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1619 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1621 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1623 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1624 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1625 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1627 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1628 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1629 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1631 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1632 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1633 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1635 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1636 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1637 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1639 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1644 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1645 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1647 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1649 q->setup = EZ(t->setup * 1000, T);
1650 q->act8b = EZ(t->act8b * 1000, T);
1651 q->rec8b = EZ(t->rec8b * 1000, T);
1652 q->cyc8b = EZ(t->cyc8b * 1000, T);
1653 q->active = EZ(t->active * 1000, T);
1654 q->recover = EZ(t->recover * 1000, T);
1655 q->cycle = EZ(t->cycle * 1000, T);
1656 q->udma = EZ(t->udma * 1000, UT);
1659 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1660 struct ata_timing *m, unsigned int what)
1662 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1663 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1664 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1665 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1666 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1667 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1668 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1669 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1672 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1674 const struct ata_timing *t;
1676 for (t = ata_timing; t->mode != speed; t++)
1677 if (t->mode == 0xFF)
1682 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1683 struct ata_timing *t, int T, int UT)
1685 const struct ata_timing *s;
1686 struct ata_timing p;
1692 if (!(s = ata_timing_find_mode(speed)))
1695 memcpy(t, s, sizeof(*s));
1698 * If the drive is an EIDE drive, it can tell us it needs extended
1699 * PIO/MW_DMA cycle timing.
1702 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1703 memset(&p, 0, sizeof(p));
1704 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1705 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1706 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1707 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1708 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1710 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1714 * Convert the timing to bus clock counts.
1717 ata_timing_quantize(t, t, T, UT);
1720 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1721 * S.M.A.R.T * and some other commands. We have to ensure that the
1722 * DMA cycle timing is slower/equal than the fastest PIO timing.
1725 if (speed > XFER_PIO_4) {
1726 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1727 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1731 * Lengthen active & recovery time so that cycle time is correct.
1734 if (t->act8b + t->rec8b < t->cyc8b) {
1735 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1736 t->rec8b = t->cyc8b - t->act8b;
1739 if (t->active + t->recover < t->cycle) {
1740 t->active += (t->cycle - (t->active + t->recover)) / 2;
1741 t->recover = t->cycle - t->active;
1747 static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1749 if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1752 if (dev->xfer_shift == ATA_SHIFT_PIO)
1753 dev->flags |= ATA_DFLAG_PIO;
1755 ata_dev_set_xfermode(ap, dev);
1757 if (ata_dev_revalidate(ap, dev, 0)) {
1758 printk(KERN_ERR "ata%u: failed to revalidate after set "
1759 "xfermode, disabled\n", ap->id);
1760 ata_port_disable(ap);
1763 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1764 dev->xfer_shift, (int)dev->xfer_mode);
1766 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1768 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1771 static int ata_host_set_pio(struct ata_port *ap)
1775 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1776 struct ata_device *dev = &ap->device[i];
1778 if (!ata_dev_present(dev))
1781 if (!dev->pio_mode) {
1782 printk(KERN_WARNING "ata%u: no PIO support for device %d.\n", ap->id, i);
1786 dev->xfer_mode = dev->pio_mode;
1787 dev->xfer_shift = ATA_SHIFT_PIO;
1788 if (ap->ops->set_piomode)
1789 ap->ops->set_piomode(ap, dev);
1795 static void ata_host_set_dma(struct ata_port *ap)
1799 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1800 struct ata_device *dev = &ap->device[i];
1802 if (!ata_dev_present(dev) || !dev->dma_mode)
1805 dev->xfer_mode = dev->dma_mode;
1806 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
1807 if (ap->ops->set_dmamode)
1808 ap->ops->set_dmamode(ap, dev);
1813 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1814 * @ap: port on which timings will be programmed
1816 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1819 * PCI/etc. bus probe sem.
1821 static void ata_set_mode(struct ata_port *ap)
1825 /* step 1: calculate xfer_mask */
1826 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1827 struct ata_device *dev = &ap->device[i];
1828 unsigned int pio_mask, dma_mask;
1830 if (!ata_dev_present(dev))
1833 ata_dev_xfermask(ap, dev);
1835 /* TODO: let LLDD filter dev->*_mask here */
1837 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
1838 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
1839 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
1840 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
1843 /* step 2: always set host PIO timings */
1844 rc = ata_host_set_pio(ap);
1848 /* step 3: set host DMA timings */
1849 ata_host_set_dma(ap);
1851 /* step 4: update devices' xfer mode */
1852 for (i = 0; i < ATA_MAX_DEVICES; i++)
1853 ata_dev_set_mode(ap, &ap->device[i]);
1855 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1858 if (ap->ops->post_set_mode)
1859 ap->ops->post_set_mode(ap);
1864 ata_port_disable(ap);
1868 * ata_tf_to_host - issue ATA taskfile to host controller
1869 * @ap: port to which command is being issued
1870 * @tf: ATA taskfile register set
1872 * Issues ATA taskfile register set to ATA host controller,
1873 * with proper synchronization with interrupt handler and
1877 * spin_lock_irqsave(host_set lock)
1880 static inline void ata_tf_to_host(struct ata_port *ap,
1881 const struct ata_taskfile *tf)
1883 ap->ops->tf_load(ap, tf);
1884 ap->ops->exec_command(ap, tf);
1888 * ata_busy_sleep - sleep until BSY clears, or timeout
1889 * @ap: port containing status register to be polled
1890 * @tmout_pat: impatience timeout
1891 * @tmout: overall timeout
1893 * Sleep until ATA Status register bit BSY clears,
1894 * or a timeout occurs.
1899 unsigned int ata_busy_sleep (struct ata_port *ap,
1900 unsigned long tmout_pat, unsigned long tmout)
1902 unsigned long timer_start, timeout;
1905 status = ata_busy_wait(ap, ATA_BUSY, 300);
1906 timer_start = jiffies;
1907 timeout = timer_start + tmout_pat;
1908 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1910 status = ata_busy_wait(ap, ATA_BUSY, 3);
1913 if (status & ATA_BUSY)
1914 printk(KERN_WARNING "ata%u is slow to respond, "
1915 "please be patient\n", ap->id);
1917 timeout = timer_start + tmout;
1918 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1920 status = ata_chk_status(ap);
1923 if (status & ATA_BUSY) {
1924 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1925 ap->id, tmout / HZ);
1932 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1934 struct ata_ioports *ioaddr = &ap->ioaddr;
1935 unsigned int dev0 = devmask & (1 << 0);
1936 unsigned int dev1 = devmask & (1 << 1);
1937 unsigned long timeout;
1939 /* if device 0 was found in ata_devchk, wait for its
1943 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1945 /* if device 1 was found in ata_devchk, wait for
1946 * register access, then wait for BSY to clear
1948 timeout = jiffies + ATA_TMOUT_BOOT;
1952 ap->ops->dev_select(ap, 1);
1953 if (ap->flags & ATA_FLAG_MMIO) {
1954 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1955 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1957 nsect = inb(ioaddr->nsect_addr);
1958 lbal = inb(ioaddr->lbal_addr);
1960 if ((nsect == 1) && (lbal == 1))
1962 if (time_after(jiffies, timeout)) {
1966 msleep(50); /* give drive a breather */
1969 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1971 /* is all this really necessary? */
1972 ap->ops->dev_select(ap, 0);
1974 ap->ops->dev_select(ap, 1);
1976 ap->ops->dev_select(ap, 0);
1980 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1981 * @ap: Port to reset and probe
1983 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1984 * probe the bus. Not often used these days.
1987 * PCI/etc. bus probe sem.
1988 * Obtains host_set lock.
1992 static unsigned int ata_bus_edd(struct ata_port *ap)
1994 struct ata_taskfile tf;
1995 unsigned long flags;
1997 /* set up execute-device-diag (bus reset) taskfile */
1998 /* also, take interrupts to a known state (disabled) */
1999 DPRINTK("execute-device-diag\n");
2000 ata_tf_init(ap, &tf, 0);
2002 tf.command = ATA_CMD_EDD;
2003 tf.protocol = ATA_PROT_NODATA;
2006 spin_lock_irqsave(&ap->host_set->lock, flags);
2007 ata_tf_to_host(ap, &tf);
2008 spin_unlock_irqrestore(&ap->host_set->lock, flags);
2010 /* spec says at least 2ms. but who knows with those
2011 * crazy ATAPI devices...
2015 return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2018 static unsigned int ata_bus_softreset(struct ata_port *ap,
2019 unsigned int devmask)
2021 struct ata_ioports *ioaddr = &ap->ioaddr;
2023 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2025 /* software reset. causes dev0 to be selected */
2026 if (ap->flags & ATA_FLAG_MMIO) {
2027 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2028 udelay(20); /* FIXME: flush */
2029 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2030 udelay(20); /* FIXME: flush */
2031 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2033 outb(ap->ctl, ioaddr->ctl_addr);
2035 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2037 outb(ap->ctl, ioaddr->ctl_addr);
2040 /* spec mandates ">= 2ms" before checking status.
2041 * We wait 150ms, because that was the magic delay used for
2042 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2043 * between when the ATA command register is written, and then
2044 * status is checked. Because waiting for "a while" before
2045 * checking status is fine, post SRST, we perform this magic
2046 * delay here as well.
2048 * Old drivers/ide uses the 2mS rule and then waits for ready
2053 /* Before we perform post reset processing we want to see if
2054 the bus shows 0xFF because the odd clown forgets the D7 pulldown
2057 if (ata_check_status(ap) == 0xFF)
2058 return 1; /* Positive is failure for some reason */
2060 ata_bus_post_reset(ap, devmask);
2066 * ata_bus_reset - reset host port and associated ATA channel
2067 * @ap: port to reset
2069 * This is typically the first time we actually start issuing
2070 * commands to the ATA channel. We wait for BSY to clear, then
2071 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2072 * result. Determine what devices, if any, are on the channel
2073 * by looking at the device 0/1 error register. Look at the signature
2074 * stored in each device's taskfile registers, to determine if
2075 * the device is ATA or ATAPI.
2078 * PCI/etc. bus probe sem.
2079 * Obtains host_set lock.
2082 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2085 void ata_bus_reset(struct ata_port *ap)
2087 struct ata_ioports *ioaddr = &ap->ioaddr;
2088 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2090 unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
2092 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2094 /* determine if device 0/1 are present */
2095 if (ap->flags & ATA_FLAG_SATA_RESET)
2098 dev0 = ata_devchk(ap, 0);
2100 dev1 = ata_devchk(ap, 1);
2104 devmask |= (1 << 0);
2106 devmask |= (1 << 1);
2108 /* select device 0 again */
2109 ap->ops->dev_select(ap, 0);
2111 /* issue bus reset */
2112 if (ap->flags & ATA_FLAG_SRST)
2113 rc = ata_bus_softreset(ap, devmask);
2114 else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
2115 /* set up device control */
2116 if (ap->flags & ATA_FLAG_MMIO)
2117 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2119 outb(ap->ctl, ioaddr->ctl_addr);
2120 rc = ata_bus_edd(ap);
2127 * determine by signature whether we have ATA or ATAPI devices
2129 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2130 if ((slave_possible) && (err != 0x81))
2131 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2133 /* re-enable interrupts */
2134 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2137 /* is double-select really necessary? */
2138 if (ap->device[1].class != ATA_DEV_NONE)
2139 ap->ops->dev_select(ap, 1);
2140 if (ap->device[0].class != ATA_DEV_NONE)
2141 ap->ops->dev_select(ap, 0);
2143 /* if no devices were detected, disable this port */
2144 if ((ap->device[0].class == ATA_DEV_NONE) &&
2145 (ap->device[1].class == ATA_DEV_NONE))
2148 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2149 /* set up device control for ATA_FLAG_SATA_RESET */
2150 if (ap->flags & ATA_FLAG_MMIO)
2151 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2153 outb(ap->ctl, ioaddr->ctl_addr);
2160 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2161 ap->ops->port_disable(ap);
2166 static int sata_phy_resume(struct ata_port *ap)
2168 unsigned long timeout = jiffies + (HZ * 5);
2171 scr_write_flush(ap, SCR_CONTROL, 0x300);
2173 /* Wait for phy to become ready, if necessary. */
2176 sstatus = scr_read(ap, SCR_STATUS);
2177 if ((sstatus & 0xf) != 1)
2179 } while (time_before(jiffies, timeout));
2185 * ata_std_probeinit - initialize probing
2186 * @ap: port to be probed
2188 * @ap is about to be probed. Initialize it. This function is
2189 * to be used as standard callback for ata_drive_probe_reset().
2191 * NOTE!!! Do not use this function as probeinit if a low level
2192 * driver implements only hardreset. Just pass NULL as probeinit
2193 * in that case. Using this function is probably okay but doing
2194 * so makes reset sequence different from the original
2195 * ->phy_reset implementation and Jeff nervous. :-P
2197 extern void ata_std_probeinit(struct ata_port *ap)
2199 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
2200 sata_phy_resume(ap);
2201 if (sata_dev_present(ap))
2202 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2207 * ata_std_softreset - reset host port via ATA SRST
2208 * @ap: port to reset
2209 * @verbose: fail verbosely
2210 * @classes: resulting classes of attached devices
2212 * Reset host port using ATA SRST. This function is to be used
2213 * as standard callback for ata_drive_*_reset() functions.
2216 * Kernel thread context (may sleep)
2219 * 0 on success, -errno otherwise.
2221 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2223 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2224 unsigned int devmask = 0, err_mask;
2229 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2230 classes[0] = ATA_DEV_NONE;
2234 /* determine if device 0/1 are present */
2235 if (ata_devchk(ap, 0))
2236 devmask |= (1 << 0);
2237 if (slave_possible && ata_devchk(ap, 1))
2238 devmask |= (1 << 1);
2240 /* select device 0 again */
2241 ap->ops->dev_select(ap, 0);
2243 /* issue bus reset */
2244 DPRINTK("about to softreset, devmask=%x\n", devmask);
2245 err_mask = ata_bus_softreset(ap, devmask);
2248 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2251 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2256 /* determine by signature whether we have ATA or ATAPI devices */
2257 classes[0] = ata_dev_try_classify(ap, 0, &err);
2258 if (slave_possible && err != 0x81)
2259 classes[1] = ata_dev_try_classify(ap, 1, &err);
2262 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2267 * sata_std_hardreset - reset host port via SATA phy reset
2268 * @ap: port to reset
2269 * @verbose: fail verbosely
2270 * @class: resulting class of attached device
2272 * SATA phy-reset host port using DET bits of SControl register.
2273 * This function is to be used as standard callback for
2274 * ata_drive_*_reset().
2277 * Kernel thread context (may sleep)
2280 * 0 on success, -errno otherwise.
2282 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2286 /* Issue phy wake/reset */
2287 scr_write_flush(ap, SCR_CONTROL, 0x301);
2290 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2291 * 10.4.2 says at least 1 ms.
2295 /* Bring phy back */
2296 sata_phy_resume(ap);
2298 /* TODO: phy layer with polling, timeouts, etc. */
2299 if (!sata_dev_present(ap)) {
2300 *class = ATA_DEV_NONE;
2301 DPRINTK("EXIT, link offline\n");
2305 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2307 printk(KERN_ERR "ata%u: COMRESET failed "
2308 "(device not ready)\n", ap->id);
2310 DPRINTK("EXIT, device not ready\n");
2314 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2316 *class = ata_dev_try_classify(ap, 0, NULL);
2318 DPRINTK("EXIT, class=%u\n", *class);
2323 * ata_std_postreset - standard postreset callback
2324 * @ap: the target ata_port
2325 * @classes: classes of attached devices
2327 * This function is invoked after a successful reset. Note that
2328 * the device might have been reset more than once using
2329 * different reset methods before postreset is invoked.
2331 * This function is to be used as standard callback for
2332 * ata_drive_*_reset().
2335 * Kernel thread context (may sleep)
2337 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2341 /* set cable type if it isn't already set */
2342 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2343 ap->cbl = ATA_CBL_SATA;
2345 /* print link status */
2346 if (ap->cbl == ATA_CBL_SATA)
2347 sata_print_link_status(ap);
2349 /* re-enable interrupts */
2350 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2353 /* is double-select really necessary? */
2354 if (classes[0] != ATA_DEV_NONE)
2355 ap->ops->dev_select(ap, 1);
2356 if (classes[1] != ATA_DEV_NONE)
2357 ap->ops->dev_select(ap, 0);
2359 /* bail out if no device is present */
2360 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2361 DPRINTK("EXIT, no device\n");
2365 /* set up device control */
2366 if (ap->ioaddr.ctl_addr) {
2367 if (ap->flags & ATA_FLAG_MMIO)
2368 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2370 outb(ap->ctl, ap->ioaddr.ctl_addr);
2377 * ata_std_probe_reset - standard probe reset method
2378 * @ap: prot to perform probe-reset
2379 * @classes: resulting classes of attached devices
2381 * The stock off-the-shelf ->probe_reset method.
2384 * Kernel thread context (may sleep)
2387 * 0 on success, -errno otherwise.
2389 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2391 ata_reset_fn_t hardreset;
2394 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2395 hardreset = sata_std_hardreset;
2397 return ata_drive_probe_reset(ap, ata_std_probeinit,
2398 ata_std_softreset, hardreset,
2399 ata_std_postreset, classes);
2402 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2403 ata_postreset_fn_t postreset,
2404 unsigned int *classes)
2408 for (i = 0; i < ATA_MAX_DEVICES; i++)
2409 classes[i] = ATA_DEV_UNKNOWN;
2411 rc = reset(ap, 0, classes);
2415 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2416 * is complete and convert all ATA_DEV_UNKNOWN to
2419 for (i = 0; i < ATA_MAX_DEVICES; i++)
2420 if (classes[i] != ATA_DEV_UNKNOWN)
2423 if (i < ATA_MAX_DEVICES)
2424 for (i = 0; i < ATA_MAX_DEVICES; i++)
2425 if (classes[i] == ATA_DEV_UNKNOWN)
2426 classes[i] = ATA_DEV_NONE;
2429 postreset(ap, classes);
2431 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2435 * ata_drive_probe_reset - Perform probe reset with given methods
2436 * @ap: port to reset
2437 * @probeinit: probeinit method (can be NULL)
2438 * @softreset: softreset method (can be NULL)
2439 * @hardreset: hardreset method (can be NULL)
2440 * @postreset: postreset method (can be NULL)
2441 * @classes: resulting classes of attached devices
2443 * Reset the specified port and classify attached devices using
2444 * given methods. This function prefers softreset but tries all
2445 * possible reset sequences to reset and classify devices. This
2446 * function is intended to be used for constructing ->probe_reset
2447 * callback by low level drivers.
2449 * Reset methods should follow the following rules.
2451 * - Return 0 on sucess, -errno on failure.
2452 * - If classification is supported, fill classes[] with
2453 * recognized class codes.
2454 * - If classification is not supported, leave classes[] alone.
2455 * - If verbose is non-zero, print error message on failure;
2456 * otherwise, shut up.
2459 * Kernel thread context (may sleep)
2462 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2463 * if classification fails, and any error code from reset
2466 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2467 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2468 ata_postreset_fn_t postreset, unsigned int *classes)
2476 rc = do_probe_reset(ap, softreset, postreset, classes);
2484 rc = do_probe_reset(ap, hardreset, postreset, classes);
2485 if (rc == 0 || rc != -ENODEV)
2489 rc = do_probe_reset(ap, softreset, postreset, classes);
2495 * ata_dev_same_device - Determine whether new ID matches configured device
2496 * @ap: port on which the device to compare against resides
2497 * @dev: device to compare against
2498 * @new_class: class of the new device
2499 * @new_id: IDENTIFY page of the new device
2501 * Compare @new_class and @new_id against @dev and determine
2502 * whether @dev is the device indicated by @new_class and
2509 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2511 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2512 unsigned int new_class, const u16 *new_id)
2514 const u16 *old_id = dev->id;
2515 unsigned char model[2][41], serial[2][21];
2518 if (dev->class != new_class) {
2520 "ata%u: dev %u class mismatch %d != %d\n",
2521 ap->id, dev->devno, dev->class, new_class);
2525 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2526 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2527 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2528 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2529 new_n_sectors = ata_id_n_sectors(new_id);
2531 if (strcmp(model[0], model[1])) {
2533 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2534 ap->id, dev->devno, model[0], model[1]);
2538 if (strcmp(serial[0], serial[1])) {
2540 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2541 ap->id, dev->devno, serial[0], serial[1]);
2545 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2547 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2548 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2549 (unsigned long long)new_n_sectors);
2557 * ata_dev_revalidate - Revalidate ATA device
2558 * @ap: port on which the device to revalidate resides
2559 * @dev: device to revalidate
2560 * @post_reset: is this revalidation after reset?
2562 * Re-read IDENTIFY page and make sure @dev is still attached to
2566 * Kernel thread context (may sleep)
2569 * 0 on success, negative errno otherwise
2571 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2578 if (!ata_dev_present(dev))
2584 /* allocate & read ID data */
2585 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2589 /* is the device still there? */
2590 if (!ata_dev_same_device(ap, dev, class, id)) {
2598 /* configure device according to the new ID */
2599 return ata_dev_configure(ap, dev, 0);
2602 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2603 ap->id, dev->devno, rc);
2608 static const char * const ata_dma_blacklist [] = {
2609 "WDC AC11000H", NULL,
2610 "WDC AC22100H", NULL,
2611 "WDC AC32500H", NULL,
2612 "WDC AC33100H", NULL,
2613 "WDC AC31600H", NULL,
2614 "WDC AC32100H", "24.09P07",
2615 "WDC AC23200L", "21.10N21",
2616 "Compaq CRD-8241B", NULL,
2621 "SanDisk SDP3B", NULL,
2622 "SanDisk SDP3B-64", NULL,
2623 "SANYO CD-ROM CRD", NULL,
2624 "HITACHI CDR-8", NULL,
2625 "HITACHI CDR-8335", NULL,
2626 "HITACHI CDR-8435", NULL,
2627 "Toshiba CD-ROM XM-6202B", NULL,
2628 "TOSHIBA CD-ROM XM-1702BC", NULL,
2630 "E-IDE CD-ROM CR-840", NULL,
2631 "CD-ROM Drive/F5A", NULL,
2632 "WPI CDD-820", NULL,
2633 "SAMSUNG CD-ROM SC-148C", NULL,
2634 "SAMSUNG CD-ROM SC", NULL,
2635 "SanDisk SDP3B-64", NULL,
2636 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2637 "_NEC DV5800A", NULL,
2638 "SAMSUNG CD-ROM SN-124", "N001"
2641 static int ata_strim(char *s, size_t len)
2643 len = strnlen(s, len);
2645 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2646 while ((len > 0) && (s[len - 1] == ' ')) {
2653 static int ata_dma_blacklisted(const struct ata_device *dev)
2655 unsigned char model_num[40];
2656 unsigned char model_rev[16];
2657 unsigned int nlen, rlen;
2660 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2662 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2664 nlen = ata_strim(model_num, sizeof(model_num));
2665 rlen = ata_strim(model_rev, sizeof(model_rev));
2667 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2668 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2669 if (ata_dma_blacklist[i+1] == NULL)
2671 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2679 * ata_dev_xfermask - Compute supported xfermask of the given device
2680 * @ap: Port on which the device to compute xfermask for resides
2681 * @dev: Device to compute xfermask for
2683 * Compute supported xfermask of @dev and store it in
2684 * dev->*_mask. This function is responsible for applying all
2685 * known limits including host controller limits, device
2691 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
2693 unsigned long xfer_mask;
2696 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
2699 /* use port-wide xfermask for now */
2700 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2701 struct ata_device *d = &ap->device[i];
2702 if (!ata_dev_present(d))
2704 xfer_mask &= ata_pack_xfermask(d->pio_mask, d->mwdma_mask,
2706 xfer_mask &= ata_id_xfermask(d->id);
2707 if (ata_dma_blacklisted(d))
2708 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2711 if (ata_dma_blacklisted(dev))
2712 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2713 "disabling DMA\n", ap->id, dev->devno);
2715 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2720 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2721 * @ap: Port associated with device @dev
2722 * @dev: Device to which command will be sent
2724 * Issue SET FEATURES - XFER MODE command to device @dev
2728 * PCI/etc. bus probe sem.
2731 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
2733 struct ata_taskfile tf;
2735 /* set up set-features taskfile */
2736 DPRINTK("set features - xfer mode\n");
2738 ata_tf_init(ap, &tf, dev->devno);
2739 tf.command = ATA_CMD_SET_FEATURES;
2740 tf.feature = SETFEATURES_XFER;
2741 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2742 tf.protocol = ATA_PROT_NODATA;
2743 tf.nsect = dev->xfer_mode;
2745 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2746 printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
2748 ata_port_disable(ap);
2755 * ata_dev_init_params - Issue INIT DEV PARAMS command
2756 * @ap: Port associated with device @dev
2757 * @dev: Device to which command will be sent
2760 * Kernel thread context (may sleep)
2763 * 0 on success, AC_ERR_* mask otherwise.
2766 static unsigned int ata_dev_init_params(struct ata_port *ap,
2767 struct ata_device *dev)
2769 struct ata_taskfile tf;
2770 unsigned int err_mask;
2771 u16 sectors = dev->id[6];
2772 u16 heads = dev->id[3];
2774 /* Number of sectors per track 1-255. Number of heads 1-16 */
2775 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2778 /* set up init dev params taskfile */
2779 DPRINTK("init dev params \n");
2781 ata_tf_init(ap, &tf, dev->devno);
2782 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2783 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2784 tf.protocol = ATA_PROT_NODATA;
2786 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2788 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2790 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2795 * ata_sg_clean - Unmap DMA memory associated with command
2796 * @qc: Command containing DMA memory to be released
2798 * Unmap all mapped DMA memory associated with this command.
2801 * spin_lock_irqsave(host_set lock)
2804 static void ata_sg_clean(struct ata_queued_cmd *qc)
2806 struct ata_port *ap = qc->ap;
2807 struct scatterlist *sg = qc->__sg;
2808 int dir = qc->dma_dir;
2809 void *pad_buf = NULL;
2811 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2812 WARN_ON(sg == NULL);
2814 if (qc->flags & ATA_QCFLAG_SINGLE)
2815 WARN_ON(qc->n_elem > 1);
2817 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2819 /* if we padded the buffer out to 32-bit bound, and data
2820 * xfer direction is from-device, we must copy from the
2821 * pad buffer back into the supplied buffer
2823 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2824 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2826 if (qc->flags & ATA_QCFLAG_SG) {
2828 dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
2829 /* restore last sg */
2830 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2832 struct scatterlist *psg = &qc->pad_sgent;
2833 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2834 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2835 kunmap_atomic(addr, KM_IRQ0);
2839 dma_unmap_single(ap->host_set->dev,
2840 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2843 sg->length += qc->pad_len;
2845 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2846 pad_buf, qc->pad_len);
2849 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2854 * ata_fill_sg - Fill PCI IDE PRD table
2855 * @qc: Metadata associated with taskfile to be transferred
2857 * Fill PCI IDE PRD (scatter-gather) table with segments
2858 * associated with the current disk command.
2861 * spin_lock_irqsave(host_set lock)
2864 static void ata_fill_sg(struct ata_queued_cmd *qc)
2866 struct ata_port *ap = qc->ap;
2867 struct scatterlist *sg;
2870 WARN_ON(qc->__sg == NULL);
2871 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2874 ata_for_each_sg(sg, qc) {
2878 /* determine if physical DMA addr spans 64K boundary.
2879 * Note h/w doesn't support 64-bit, so we unconditionally
2880 * truncate dma_addr_t to u32.
2882 addr = (u32) sg_dma_address(sg);
2883 sg_len = sg_dma_len(sg);
2886 offset = addr & 0xffff;
2888 if ((offset + sg_len) > 0x10000)
2889 len = 0x10000 - offset;
2891 ap->prd[idx].addr = cpu_to_le32(addr);
2892 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2893 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2902 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2905 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2906 * @qc: Metadata associated with taskfile to check
2908 * Allow low-level driver to filter ATA PACKET commands, returning
2909 * a status indicating whether or not it is OK to use DMA for the
2910 * supplied PACKET command.
2913 * spin_lock_irqsave(host_set lock)
2915 * RETURNS: 0 when ATAPI DMA can be used
2918 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2920 struct ata_port *ap = qc->ap;
2921 int rc = 0; /* Assume ATAPI DMA is OK by default */
2923 if (ap->ops->check_atapi_dma)
2924 rc = ap->ops->check_atapi_dma(qc);
2929 * ata_qc_prep - Prepare taskfile for submission
2930 * @qc: Metadata associated with taskfile to be prepared
2932 * Prepare ATA taskfile for submission.
2935 * spin_lock_irqsave(host_set lock)
2937 void ata_qc_prep(struct ata_queued_cmd *qc)
2939 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2945 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
2948 * ata_sg_init_one - Associate command with memory buffer
2949 * @qc: Command to be associated
2950 * @buf: Memory buffer
2951 * @buflen: Length of memory buffer, in bytes.
2953 * Initialize the data-related elements of queued_cmd @qc
2954 * to point to a single memory buffer, @buf of byte length @buflen.
2957 * spin_lock_irqsave(host_set lock)
2960 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2962 struct scatterlist *sg;
2964 qc->flags |= ATA_QCFLAG_SINGLE;
2966 memset(&qc->sgent, 0, sizeof(qc->sgent));
2967 qc->__sg = &qc->sgent;
2969 qc->orig_n_elem = 1;
2973 sg_init_one(sg, buf, buflen);
2977 * ata_sg_init - Associate command with scatter-gather table.
2978 * @qc: Command to be associated
2979 * @sg: Scatter-gather table.
2980 * @n_elem: Number of elements in s/g table.
2982 * Initialize the data-related elements of queued_cmd @qc
2983 * to point to a scatter-gather table @sg, containing @n_elem
2987 * spin_lock_irqsave(host_set lock)
2990 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2991 unsigned int n_elem)
2993 qc->flags |= ATA_QCFLAG_SG;
2995 qc->n_elem = n_elem;
2996 qc->orig_n_elem = n_elem;
3000 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3001 * @qc: Command with memory buffer to be mapped.
3003 * DMA-map the memory buffer associated with queued_cmd @qc.
3006 * spin_lock_irqsave(host_set lock)
3009 * Zero on success, negative on error.
3012 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3014 struct ata_port *ap = qc->ap;
3015 int dir = qc->dma_dir;
3016 struct scatterlist *sg = qc->__sg;
3017 dma_addr_t dma_address;
3020 /* we must lengthen transfers to end on a 32-bit boundary */
3021 qc->pad_len = sg->length & 3;
3023 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3024 struct scatterlist *psg = &qc->pad_sgent;
3026 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3028 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3030 if (qc->tf.flags & ATA_TFLAG_WRITE)
3031 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3034 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3035 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3037 sg->length -= qc->pad_len;
3038 if (sg->length == 0)
3041 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3042 sg->length, qc->pad_len);
3050 dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
3052 if (dma_mapping_error(dma_address)) {
3054 sg->length += qc->pad_len;
3058 sg_dma_address(sg) = dma_address;
3059 sg_dma_len(sg) = sg->length;
3062 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3063 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3069 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3070 * @qc: Command with scatter-gather table to be mapped.
3072 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3075 * spin_lock_irqsave(host_set lock)
3078 * Zero on success, negative on error.
3082 static int ata_sg_setup(struct ata_queued_cmd *qc)
3084 struct ata_port *ap = qc->ap;
3085 struct scatterlist *sg = qc->__sg;
3086 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3087 int n_elem, pre_n_elem, dir, trim_sg = 0;
3089 VPRINTK("ENTER, ata%u\n", ap->id);
3090 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3092 /* we must lengthen transfers to end on a 32-bit boundary */
3093 qc->pad_len = lsg->length & 3;
3095 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3096 struct scatterlist *psg = &qc->pad_sgent;
3097 unsigned int offset;
3099 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3101 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3104 * psg->page/offset are used to copy to-be-written
3105 * data in this function or read data in ata_sg_clean.
3107 offset = lsg->offset + lsg->length - qc->pad_len;
3108 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3109 psg->offset = offset_in_page(offset);
3111 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3112 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3113 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3114 kunmap_atomic(addr, KM_IRQ0);
3117 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3118 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3120 lsg->length -= qc->pad_len;
3121 if (lsg->length == 0)
3124 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3125 qc->n_elem - 1, lsg->length, qc->pad_len);
3128 pre_n_elem = qc->n_elem;
3129 if (trim_sg && pre_n_elem)
3138 n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
3140 /* restore last sg */
3141 lsg->length += qc->pad_len;
3145 DPRINTK("%d sg elements mapped\n", n_elem);
3148 qc->n_elem = n_elem;
3154 * ata_poll_qc_complete - turn irq back on and finish qc
3155 * @qc: Command to complete
3156 * @err_mask: ATA status register content
3159 * None. (grabs host lock)
3162 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3164 struct ata_port *ap = qc->ap;
3165 unsigned long flags;
3167 spin_lock_irqsave(&ap->host_set->lock, flags);
3168 ap->flags &= ~ATA_FLAG_NOINTR;
3170 ata_qc_complete(qc);
3171 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3175 * ata_pio_poll - poll using PIO, depending on current state
3176 * @ap: the target ata_port
3179 * None. (executing in kernel thread context)
3182 * timeout value to use
3185 static unsigned long ata_pio_poll(struct ata_port *ap)
3187 struct ata_queued_cmd *qc;
3189 unsigned int poll_state = HSM_ST_UNKNOWN;
3190 unsigned int reg_state = HSM_ST_UNKNOWN;
3192 qc = ata_qc_from_tag(ap, ap->active_tag);
3193 WARN_ON(qc == NULL);
3195 switch (ap->hsm_task_state) {
3198 poll_state = HSM_ST_POLL;
3202 case HSM_ST_LAST_POLL:
3203 poll_state = HSM_ST_LAST_POLL;
3204 reg_state = HSM_ST_LAST;
3211 status = ata_chk_status(ap);
3212 if (status & ATA_BUSY) {
3213 if (time_after(jiffies, ap->pio_task_timeout)) {
3214 qc->err_mask |= AC_ERR_TIMEOUT;
3215 ap->hsm_task_state = HSM_ST_TMOUT;
3218 ap->hsm_task_state = poll_state;
3219 return ATA_SHORT_PAUSE;
3222 ap->hsm_task_state = reg_state;
3227 * ata_pio_complete - check if drive is busy or idle
3228 * @ap: the target ata_port
3231 * None. (executing in kernel thread context)
3234 * Non-zero if qc completed, zero otherwise.
3237 static int ata_pio_complete (struct ata_port *ap)
3239 struct ata_queued_cmd *qc;
3243 * This is purely heuristic. This is a fast path. Sometimes when
3244 * we enter, BSY will be cleared in a chk-status or two. If not,
3245 * the drive is probably seeking or something. Snooze for a couple
3246 * msecs, then chk-status again. If still busy, fall back to
3247 * HSM_ST_POLL state.
3249 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3250 if (drv_stat & ATA_BUSY) {
3252 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3253 if (drv_stat & ATA_BUSY) {
3254 ap->hsm_task_state = HSM_ST_LAST_POLL;
3255 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3260 qc = ata_qc_from_tag(ap, ap->active_tag);
3261 WARN_ON(qc == NULL);
3263 drv_stat = ata_wait_idle(ap);
3264 if (!ata_ok(drv_stat)) {
3265 qc->err_mask |= __ac_err_mask(drv_stat);
3266 ap->hsm_task_state = HSM_ST_ERR;
3270 ap->hsm_task_state = HSM_ST_IDLE;
3272 WARN_ON(qc->err_mask);
3273 ata_poll_qc_complete(qc);
3275 /* another command may start at this point */
3282 * swap_buf_le16 - swap halves of 16-bit words in place
3283 * @buf: Buffer to swap
3284 * @buf_words: Number of 16-bit words in buffer.
3286 * Swap halves of 16-bit words if needed to convert from
3287 * little-endian byte order to native cpu byte order, or
3291 * Inherited from caller.
3293 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3298 for (i = 0; i < buf_words; i++)
3299 buf[i] = le16_to_cpu(buf[i]);
3300 #endif /* __BIG_ENDIAN */
3304 * ata_mmio_data_xfer - Transfer data by MMIO
3305 * @ap: port to read/write
3307 * @buflen: buffer length
3308 * @write_data: read/write
3310 * Transfer data from/to the device data register by MMIO.
3313 * Inherited from caller.
3316 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3317 unsigned int buflen, int write_data)
3320 unsigned int words = buflen >> 1;
3321 u16 *buf16 = (u16 *) buf;
3322 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3324 /* Transfer multiple of 2 bytes */
3326 for (i = 0; i < words; i++)
3327 writew(le16_to_cpu(buf16[i]), mmio);
3329 for (i = 0; i < words; i++)
3330 buf16[i] = cpu_to_le16(readw(mmio));
3333 /* Transfer trailing 1 byte, if any. */
3334 if (unlikely(buflen & 0x01)) {
3335 u16 align_buf[1] = { 0 };
3336 unsigned char *trailing_buf = buf + buflen - 1;
3339 memcpy(align_buf, trailing_buf, 1);
3340 writew(le16_to_cpu(align_buf[0]), mmio);
3342 align_buf[0] = cpu_to_le16(readw(mmio));
3343 memcpy(trailing_buf, align_buf, 1);
3349 * ata_pio_data_xfer - Transfer data by PIO
3350 * @ap: port to read/write
3352 * @buflen: buffer length
3353 * @write_data: read/write
3355 * Transfer data from/to the device data register by PIO.
3358 * Inherited from caller.
3361 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3362 unsigned int buflen, int write_data)
3364 unsigned int words = buflen >> 1;
3366 /* Transfer multiple of 2 bytes */
3368 outsw(ap->ioaddr.data_addr, buf, words);
3370 insw(ap->ioaddr.data_addr, buf, words);
3372 /* Transfer trailing 1 byte, if any. */
3373 if (unlikely(buflen & 0x01)) {
3374 u16 align_buf[1] = { 0 };
3375 unsigned char *trailing_buf = buf + buflen - 1;
3378 memcpy(align_buf, trailing_buf, 1);
3379 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3381 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3382 memcpy(trailing_buf, align_buf, 1);
3388 * ata_data_xfer - Transfer data from/to the data register.
3389 * @ap: port to read/write
3391 * @buflen: buffer length
3392 * @do_write: read/write
3394 * Transfer data from/to the device data register.
3397 * Inherited from caller.
3400 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3401 unsigned int buflen, int do_write)
3403 /* Make the crap hardware pay the costs not the good stuff */
3404 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3405 unsigned long flags;
3406 local_irq_save(flags);
3407 if (ap->flags & ATA_FLAG_MMIO)
3408 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3410 ata_pio_data_xfer(ap, buf, buflen, do_write);
3411 local_irq_restore(flags);
3413 if (ap->flags & ATA_FLAG_MMIO)
3414 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3416 ata_pio_data_xfer(ap, buf, buflen, do_write);
3421 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3422 * @qc: Command on going
3424 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3427 * Inherited from caller.
3430 static void ata_pio_sector(struct ata_queued_cmd *qc)
3432 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3433 struct scatterlist *sg = qc->__sg;
3434 struct ata_port *ap = qc->ap;
3436 unsigned int offset;
3439 if (qc->cursect == (qc->nsect - 1))
3440 ap->hsm_task_state = HSM_ST_LAST;
3442 page = sg[qc->cursg].page;
3443 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3445 /* get the current page and offset */
3446 page = nth_page(page, (offset >> PAGE_SHIFT));
3447 offset %= PAGE_SIZE;
3449 buf = kmap(page) + offset;
3454 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3459 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3461 /* do the actual data transfer */
3462 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3463 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3469 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3470 * @qc: Command on going
3471 * @bytes: number of bytes
3473 * Transfer Transfer data from/to the ATAPI device.
3476 * Inherited from caller.
3480 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3482 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3483 struct scatterlist *sg = qc->__sg;
3484 struct ata_port *ap = qc->ap;
3487 unsigned int offset, count;
3489 if (qc->curbytes + bytes >= qc->nbytes)
3490 ap->hsm_task_state = HSM_ST_LAST;
3493 if (unlikely(qc->cursg >= qc->n_elem)) {
3495 * The end of qc->sg is reached and the device expects
3496 * more data to transfer. In order not to overrun qc->sg
3497 * and fulfill length specified in the byte count register,
3498 * - for read case, discard trailing data from the device
3499 * - for write case, padding zero data to the device
3501 u16 pad_buf[1] = { 0 };
3502 unsigned int words = bytes >> 1;
3505 if (words) /* warning if bytes > 1 */
3506 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3509 for (i = 0; i < words; i++)
3510 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3512 ap->hsm_task_state = HSM_ST_LAST;
3516 sg = &qc->__sg[qc->cursg];
3519 offset = sg->offset + qc->cursg_ofs;
3521 /* get the current page and offset */
3522 page = nth_page(page, (offset >> PAGE_SHIFT));
3523 offset %= PAGE_SIZE;
3525 /* don't overrun current sg */
3526 count = min(sg->length - qc->cursg_ofs, bytes);
3528 /* don't cross page boundaries */
3529 count = min(count, (unsigned int)PAGE_SIZE - offset);
3531 buf = kmap(page) + offset;
3534 qc->curbytes += count;
3535 qc->cursg_ofs += count;
3537 if (qc->cursg_ofs == sg->length) {
3542 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3544 /* do the actual data transfer */
3545 ata_data_xfer(ap, buf, count, do_write);
3554 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3555 * @qc: Command on going
3557 * Transfer Transfer data from/to the ATAPI device.
3560 * Inherited from caller.
3563 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3565 struct ata_port *ap = qc->ap;
3566 struct ata_device *dev = qc->dev;
3567 unsigned int ireason, bc_lo, bc_hi, bytes;
3568 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3570 ap->ops->tf_read(ap, &qc->tf);
3571 ireason = qc->tf.nsect;
3572 bc_lo = qc->tf.lbam;
3573 bc_hi = qc->tf.lbah;
3574 bytes = (bc_hi << 8) | bc_lo;
3576 /* shall be cleared to zero, indicating xfer of data */
3577 if (ireason & (1 << 0))
3580 /* make sure transfer direction matches expected */
3581 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3582 if (do_write != i_write)
3585 __atapi_pio_bytes(qc, bytes);
3590 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3591 ap->id, dev->devno);
3592 qc->err_mask |= AC_ERR_HSM;
3593 ap->hsm_task_state = HSM_ST_ERR;
3597 * ata_pio_block - start PIO on a block
3598 * @ap: the target ata_port
3601 * None. (executing in kernel thread context)
3604 static void ata_pio_block(struct ata_port *ap)
3606 struct ata_queued_cmd *qc;
3610 * This is purely heuristic. This is a fast path.
3611 * Sometimes when we enter, BSY will be cleared in
3612 * a chk-status or two. If not, the drive is probably seeking
3613 * or something. Snooze for a couple msecs, then
3614 * chk-status again. If still busy, fall back to
3615 * HSM_ST_POLL state.
3617 status = ata_busy_wait(ap, ATA_BUSY, 5);
3618 if (status & ATA_BUSY) {
3620 status = ata_busy_wait(ap, ATA_BUSY, 10);
3621 if (status & ATA_BUSY) {
3622 ap->hsm_task_state = HSM_ST_POLL;
3623 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3628 qc = ata_qc_from_tag(ap, ap->active_tag);
3629 WARN_ON(qc == NULL);
3632 if (status & (ATA_ERR | ATA_DF)) {
3633 qc->err_mask |= AC_ERR_DEV;
3634 ap->hsm_task_state = HSM_ST_ERR;
3638 /* transfer data if any */
3639 if (is_atapi_taskfile(&qc->tf)) {
3640 /* DRQ=0 means no more data to transfer */
3641 if ((status & ATA_DRQ) == 0) {
3642 ap->hsm_task_state = HSM_ST_LAST;
3646 atapi_pio_bytes(qc);
3648 /* handle BSY=0, DRQ=0 as error */
3649 if ((status & ATA_DRQ) == 0) {
3650 qc->err_mask |= AC_ERR_HSM;
3651 ap->hsm_task_state = HSM_ST_ERR;
3659 static void ata_pio_error(struct ata_port *ap)
3661 struct ata_queued_cmd *qc;
3663 qc = ata_qc_from_tag(ap, ap->active_tag);
3664 WARN_ON(qc == NULL);
3666 if (qc->tf.command != ATA_CMD_PACKET)
3667 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3669 /* make sure qc->err_mask is available to
3670 * know what's wrong and recover
3672 WARN_ON(qc->err_mask == 0);
3674 ap->hsm_task_state = HSM_ST_IDLE;
3676 ata_poll_qc_complete(qc);
3679 static void ata_pio_task(void *_data)
3681 struct ata_port *ap = _data;
3682 unsigned long timeout;
3689 switch (ap->hsm_task_state) {
3698 qc_completed = ata_pio_complete(ap);
3702 case HSM_ST_LAST_POLL:
3703 timeout = ata_pio_poll(ap);
3713 ata_port_queue_task(ap, ata_pio_task, ap, timeout);
3714 else if (!qc_completed)
3719 * atapi_packet_task - Write CDB bytes to hardware
3720 * @_data: Port to which ATAPI device is attached.
3722 * When device has indicated its readiness to accept
3723 * a CDB, this function is called. Send the CDB.
3724 * If DMA is to be performed, exit immediately.
3725 * Otherwise, we are in polling mode, so poll
3726 * status under operation succeeds or fails.
3729 * Kernel thread context (may sleep)
3732 static void atapi_packet_task(void *_data)
3734 struct ata_port *ap = _data;
3735 struct ata_queued_cmd *qc;
3738 qc = ata_qc_from_tag(ap, ap->active_tag);
3739 WARN_ON(qc == NULL);
3740 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3742 /* sleep-wait for BSY to clear */
3743 DPRINTK("busy wait\n");
3744 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3745 qc->err_mask |= AC_ERR_TIMEOUT;
3749 /* make sure DRQ is set */
3750 status = ata_chk_status(ap);
3751 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3752 qc->err_mask |= AC_ERR_HSM;
3757 DPRINTK("send cdb\n");
3758 WARN_ON(qc->dev->cdb_len < 12);
3760 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3761 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3762 unsigned long flags;
3764 /* Once we're done issuing command and kicking bmdma,
3765 * irq handler takes over. To not lose irq, we need
3766 * to clear NOINTR flag before sending cdb, but
3767 * interrupt handler shouldn't be invoked before we're
3768 * finished. Hence, the following locking.
3770 spin_lock_irqsave(&ap->host_set->lock, flags);
3771 ap->flags &= ~ATA_FLAG_NOINTR;
3772 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3773 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3774 ap->ops->bmdma_start(qc); /* initiate bmdma */
3775 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3777 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3779 /* PIO commands are handled by polling */
3780 ap->hsm_task_state = HSM_ST;
3781 ata_port_queue_task(ap, ata_pio_task, ap, 0);
3787 ata_poll_qc_complete(qc);
3791 * ata_qc_timeout - Handle timeout of queued command
3792 * @qc: Command that timed out
3794 * Some part of the kernel (currently, only the SCSI layer)
3795 * has noticed that the active command on port @ap has not
3796 * completed after a specified length of time. Handle this
3797 * condition by disabling DMA (if necessary) and completing
3798 * transactions, with error if necessary.
3800 * This also handles the case of the "lost interrupt", where
3801 * for some reason (possibly hardware bug, possibly driver bug)
3802 * an interrupt was not delivered to the driver, even though the
3803 * transaction completed successfully.
3806 * Inherited from SCSI layer (none, can sleep)
3809 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3811 struct ata_port *ap = qc->ap;
3812 struct ata_host_set *host_set = ap->host_set;
3813 u8 host_stat = 0, drv_stat;
3814 unsigned long flags;
3818 ap->hsm_task_state = HSM_ST_IDLE;
3820 spin_lock_irqsave(&host_set->lock, flags);
3822 switch (qc->tf.protocol) {
3825 case ATA_PROT_ATAPI_DMA:
3826 host_stat = ap->ops->bmdma_status(ap);
3828 /* before we do anything else, clear DMA-Start bit */
3829 ap->ops->bmdma_stop(qc);
3835 drv_stat = ata_chk_status(ap);
3837 /* ack bmdma irq events */
3838 ap->ops->irq_clear(ap);
3840 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3841 ap->id, qc->tf.command, drv_stat, host_stat);
3843 /* complete taskfile transaction */
3844 qc->err_mask |= ac_err_mask(drv_stat);
3848 spin_unlock_irqrestore(&host_set->lock, flags);
3850 ata_eh_qc_complete(qc);
3856 * ata_eng_timeout - Handle timeout of queued command
3857 * @ap: Port on which timed-out command is active
3859 * Some part of the kernel (currently, only the SCSI layer)
3860 * has noticed that the active command on port @ap has not
3861 * completed after a specified length of time. Handle this
3862 * condition by disabling DMA (if necessary) and completing
3863 * transactions, with error if necessary.
3865 * This also handles the case of the "lost interrupt", where
3866 * for some reason (possibly hardware bug, possibly driver bug)
3867 * an interrupt was not delivered to the driver, even though the
3868 * transaction completed successfully.
3871 * Inherited from SCSI layer (none, can sleep)
3874 void ata_eng_timeout(struct ata_port *ap)
3878 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3884 * ata_qc_new - Request an available ATA command, for queueing
3885 * @ap: Port associated with device @dev
3886 * @dev: Device from whom we request an available command structure
3892 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3894 struct ata_queued_cmd *qc = NULL;
3897 for (i = 0; i < ATA_MAX_QUEUE; i++)
3898 if (!test_and_set_bit(i, &ap->qactive)) {
3899 qc = ata_qc_from_tag(ap, i);
3910 * ata_qc_new_init - Request an available ATA command, and initialize it
3911 * @ap: Port associated with device @dev
3912 * @dev: Device from whom we request an available command structure
3918 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3919 struct ata_device *dev)
3921 struct ata_queued_cmd *qc;
3923 qc = ata_qc_new(ap);
3936 * ata_qc_free - free unused ata_queued_cmd
3937 * @qc: Command to complete
3939 * Designed to free unused ata_queued_cmd object
3940 * in case something prevents using it.
3943 * spin_lock_irqsave(host_set lock)
3945 void ata_qc_free(struct ata_queued_cmd *qc)
3947 struct ata_port *ap = qc->ap;
3950 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3954 if (likely(ata_tag_valid(tag))) {
3955 if (tag == ap->active_tag)
3956 ap->active_tag = ATA_TAG_POISON;
3957 qc->tag = ATA_TAG_POISON;
3958 clear_bit(tag, &ap->qactive);
3962 void __ata_qc_complete(struct ata_queued_cmd *qc)
3964 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3965 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3967 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3970 /* atapi: mark qc as inactive to prevent the interrupt handler
3971 * from completing the command twice later, before the error handler
3972 * is called. (when rc != 0 and atapi request sense is needed)
3974 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3976 /* call completion callback */
3977 qc->complete_fn(qc);
3980 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3982 struct ata_port *ap = qc->ap;
3984 switch (qc->tf.protocol) {
3986 case ATA_PROT_ATAPI_DMA:
3989 case ATA_PROT_ATAPI:
3991 if (ap->flags & ATA_FLAG_PIO_DMA)
4004 * ata_qc_issue - issue taskfile to device
4005 * @qc: command to issue to device
4007 * Prepare an ATA command to submission to device.
4008 * This includes mapping the data into a DMA-able
4009 * area, filling in the S/G table, and finally
4010 * writing the taskfile to hardware, starting the command.
4013 * spin_lock_irqsave(host_set lock)
4016 * Zero on success, AC_ERR_* mask on failure
4019 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
4021 struct ata_port *ap = qc->ap;
4023 if (ata_should_dma_map(qc)) {
4024 if (qc->flags & ATA_QCFLAG_SG) {
4025 if (ata_sg_setup(qc))
4027 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4028 if (ata_sg_setup_one(qc))
4032 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4035 ap->ops->qc_prep(qc);
4037 qc->ap->active_tag = qc->tag;
4038 qc->flags |= ATA_QCFLAG_ACTIVE;
4040 return ap->ops->qc_issue(qc);
4043 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4044 return AC_ERR_SYSTEM;
4049 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4050 * @qc: command to issue to device
4052 * Using various libata functions and hooks, this function
4053 * starts an ATA command. ATA commands are grouped into
4054 * classes called "protocols", and issuing each type of protocol
4055 * is slightly different.
4057 * May be used as the qc_issue() entry in ata_port_operations.
4060 * spin_lock_irqsave(host_set lock)
4063 * Zero on success, AC_ERR_* mask on failure
4066 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4068 struct ata_port *ap = qc->ap;
4070 ata_dev_select(ap, qc->dev->devno, 1, 0);
4072 switch (qc->tf.protocol) {
4073 case ATA_PROT_NODATA:
4074 ata_tf_to_host(ap, &qc->tf);
4078 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4079 ap->ops->bmdma_setup(qc); /* set up bmdma */
4080 ap->ops->bmdma_start(qc); /* initiate bmdma */
4083 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4084 ata_qc_set_polling(qc);
4085 ata_tf_to_host(ap, &qc->tf);
4086 ap->hsm_task_state = HSM_ST;
4087 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4090 case ATA_PROT_ATAPI:
4091 ata_qc_set_polling(qc);
4092 ata_tf_to_host(ap, &qc->tf);
4093 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4096 case ATA_PROT_ATAPI_NODATA:
4097 ap->flags |= ATA_FLAG_NOINTR;
4098 ata_tf_to_host(ap, &qc->tf);
4099 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4102 case ATA_PROT_ATAPI_DMA:
4103 ap->flags |= ATA_FLAG_NOINTR;
4104 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4105 ap->ops->bmdma_setup(qc); /* set up bmdma */
4106 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4111 return AC_ERR_SYSTEM;
4118 * ata_host_intr - Handle host interrupt for given (port, task)
4119 * @ap: Port on which interrupt arrived (possibly...)
4120 * @qc: Taskfile currently active in engine
4122 * Handle host interrupt for given queued command. Currently,
4123 * only DMA interrupts are handled. All other commands are
4124 * handled via polling with interrupts disabled (nIEN bit).
4127 * spin_lock_irqsave(host_set lock)
4130 * One if interrupt was handled, zero if not (shared irq).
4133 inline unsigned int ata_host_intr (struct ata_port *ap,
4134 struct ata_queued_cmd *qc)
4136 u8 status, host_stat;
4138 switch (qc->tf.protocol) {
4141 case ATA_PROT_ATAPI_DMA:
4142 case ATA_PROT_ATAPI:
4143 /* check status of DMA engine */
4144 host_stat = ap->ops->bmdma_status(ap);
4145 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4147 /* if it's not our irq... */
4148 if (!(host_stat & ATA_DMA_INTR))
4151 /* before we do anything else, clear DMA-Start bit */
4152 ap->ops->bmdma_stop(qc);
4156 case ATA_PROT_ATAPI_NODATA:
4157 case ATA_PROT_NODATA:
4158 /* check altstatus */
4159 status = ata_altstatus(ap);
4160 if (status & ATA_BUSY)
4163 /* check main status, clearing INTRQ */
4164 status = ata_chk_status(ap);
4165 if (unlikely(status & ATA_BUSY))
4167 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4168 ap->id, qc->tf.protocol, status);
4170 /* ack bmdma irq events */
4171 ap->ops->irq_clear(ap);
4173 /* complete taskfile transaction */
4174 qc->err_mask |= ac_err_mask(status);
4175 ata_qc_complete(qc);
4182 return 1; /* irq handled */
4185 ap->stats.idle_irq++;
4188 if ((ap->stats.idle_irq % 1000) == 0) {
4189 ata_irq_ack(ap, 0); /* debug trap */
4190 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4194 return 0; /* irq not handled */
4198 * ata_interrupt - Default ATA host interrupt handler
4199 * @irq: irq line (unused)
4200 * @dev_instance: pointer to our ata_host_set information structure
4203 * Default interrupt handler for PCI IDE devices. Calls
4204 * ata_host_intr() for each port that is not disabled.
4207 * Obtains host_set lock during operation.
4210 * IRQ_NONE or IRQ_HANDLED.
4213 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4215 struct ata_host_set *host_set = dev_instance;
4217 unsigned int handled = 0;
4218 unsigned long flags;
4220 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4221 spin_lock_irqsave(&host_set->lock, flags);
4223 for (i = 0; i < host_set->n_ports; i++) {
4224 struct ata_port *ap;
4226 ap = host_set->ports[i];
4228 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4229 struct ata_queued_cmd *qc;
4231 qc = ata_qc_from_tag(ap, ap->active_tag);
4232 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4233 (qc->flags & ATA_QCFLAG_ACTIVE))
4234 handled |= ata_host_intr(ap, qc);
4238 spin_unlock_irqrestore(&host_set->lock, flags);
4240 return IRQ_RETVAL(handled);
4245 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4246 * without filling any other registers
4248 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4251 struct ata_taskfile tf;
4254 ata_tf_init(ap, &tf, dev->devno);
4257 tf.flags |= ATA_TFLAG_DEVICE;
4258 tf.protocol = ATA_PROT_NODATA;
4260 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4262 printk(KERN_ERR "%s: ata command failed: %d\n",
4268 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4272 if (!ata_try_flush_cache(dev))
4275 if (ata_id_has_flush_ext(dev->id))
4276 cmd = ATA_CMD_FLUSH_EXT;
4278 cmd = ATA_CMD_FLUSH;
4280 return ata_do_simple_cmd(ap, dev, cmd);
4283 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4285 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4288 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4290 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4294 * ata_device_resume - wakeup a previously suspended devices
4295 * @ap: port the device is connected to
4296 * @dev: the device to resume
4298 * Kick the drive back into action, by sending it an idle immediate
4299 * command and making sure its transfer mode matches between drive
4303 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4305 if (ap->flags & ATA_FLAG_SUSPENDED) {
4306 ap->flags &= ~ATA_FLAG_SUSPENDED;
4309 if (!ata_dev_present(dev))
4311 if (dev->class == ATA_DEV_ATA)
4312 ata_start_drive(ap, dev);
4318 * ata_device_suspend - prepare a device for suspend
4319 * @ap: port the device is connected to
4320 * @dev: the device to suspend
4322 * Flush the cache on the drive, if appropriate, then issue a
4323 * standbynow command.
4325 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
4327 if (!ata_dev_present(dev))
4329 if (dev->class == ATA_DEV_ATA)
4330 ata_flush_cache(ap, dev);
4332 ata_standby_drive(ap, dev);
4333 ap->flags |= ATA_FLAG_SUSPENDED;
4338 * ata_port_start - Set port up for dma.
4339 * @ap: Port to initialize
4341 * Called just after data structures for each port are
4342 * initialized. Allocates space for PRD table.
4344 * May be used as the port_start() entry in ata_port_operations.
4347 * Inherited from caller.
4350 int ata_port_start (struct ata_port *ap)
4352 struct device *dev = ap->host_set->dev;
4355 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4359 rc = ata_pad_alloc(ap, dev);
4361 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4365 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4372 * ata_port_stop - Undo ata_port_start()
4373 * @ap: Port to shut down
4375 * Frees the PRD table.
4377 * May be used as the port_stop() entry in ata_port_operations.
4380 * Inherited from caller.
4383 void ata_port_stop (struct ata_port *ap)
4385 struct device *dev = ap->host_set->dev;
4387 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4388 ata_pad_free(ap, dev);
4391 void ata_host_stop (struct ata_host_set *host_set)
4393 if (host_set->mmio_base)
4394 iounmap(host_set->mmio_base);
4399 * ata_host_remove - Unregister SCSI host structure with upper layers
4400 * @ap: Port to unregister
4401 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4404 * Inherited from caller.
4407 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4409 struct Scsi_Host *sh = ap->host;
4414 scsi_remove_host(sh);
4416 ap->ops->port_stop(ap);
4420 * ata_host_init - Initialize an ata_port structure
4421 * @ap: Structure to initialize
4422 * @host: associated SCSI mid-layer structure
4423 * @host_set: Collection of hosts to which @ap belongs
4424 * @ent: Probe information provided by low-level driver
4425 * @port_no: Port number associated with this ata_port
4427 * Initialize a new ata_port structure, and its associated
4431 * Inherited from caller.
4434 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4435 struct ata_host_set *host_set,
4436 const struct ata_probe_ent *ent, unsigned int port_no)
4442 host->max_channel = 1;
4443 host->unique_id = ata_unique_id++;
4444 host->max_cmd_len = 12;
4446 ap->flags = ATA_FLAG_PORT_DISABLED;
4447 ap->id = host->unique_id;
4449 ap->ctl = ATA_DEVCTL_OBS;
4450 ap->host_set = host_set;
4451 ap->port_no = port_no;
4453 ent->legacy_mode ? ent->hard_port_no : port_no;
4454 ap->pio_mask = ent->pio_mask;
4455 ap->mwdma_mask = ent->mwdma_mask;
4456 ap->udma_mask = ent->udma_mask;
4457 ap->flags |= ent->host_flags;
4458 ap->ops = ent->port_ops;
4459 ap->cbl = ATA_CBL_NONE;
4460 ap->active_tag = ATA_TAG_POISON;
4461 ap->last_ctl = 0xFF;
4463 INIT_WORK(&ap->port_task, NULL, NULL);
4464 INIT_LIST_HEAD(&ap->eh_done_q);
4466 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4467 struct ata_device *dev = &ap->device[i];
4469 dev->pio_mask = UINT_MAX;
4470 dev->mwdma_mask = UINT_MAX;
4471 dev->udma_mask = UINT_MAX;
4475 ap->stats.unhandled_irq = 1;
4476 ap->stats.idle_irq = 1;
4479 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4483 * ata_host_add - Attach low-level ATA driver to system
4484 * @ent: Information provided by low-level driver
4485 * @host_set: Collections of ports to which we add
4486 * @port_no: Port number associated with this host
4488 * Attach low-level ATA driver to system.
4491 * PCI/etc. bus probe sem.
4494 * New ata_port on success, for NULL on error.
4497 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4498 struct ata_host_set *host_set,
4499 unsigned int port_no)
4501 struct Scsi_Host *host;
4502 struct ata_port *ap;
4506 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4510 host->transportt = &ata_scsi_transport_template;
4512 ap = (struct ata_port *) &host->hostdata[0];
4514 ata_host_init(ap, host, host_set, ent, port_no);
4516 rc = ap->ops->port_start(ap);
4523 scsi_host_put(host);
4528 * ata_device_add - Register hardware device with ATA and SCSI layers
4529 * @ent: Probe information describing hardware device to be registered
4531 * This function processes the information provided in the probe
4532 * information struct @ent, allocates the necessary ATA and SCSI
4533 * host information structures, initializes them, and registers
4534 * everything with requisite kernel subsystems.
4536 * This function requests irqs, probes the ATA bus, and probes
4540 * PCI/etc. bus probe sem.
4543 * Number of ports registered. Zero on error (no ports registered).
4546 int ata_device_add(const struct ata_probe_ent *ent)
4548 unsigned int count = 0, i;
4549 struct device *dev = ent->dev;
4550 struct ata_host_set *host_set;
4553 /* alloc a container for our list of ATA ports (buses) */
4554 host_set = kzalloc(sizeof(struct ata_host_set) +
4555 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4558 spin_lock_init(&host_set->lock);
4560 host_set->dev = dev;
4561 host_set->n_ports = ent->n_ports;
4562 host_set->irq = ent->irq;
4563 host_set->mmio_base = ent->mmio_base;
4564 host_set->private_data = ent->private_data;
4565 host_set->ops = ent->port_ops;
4567 /* register each port bound to this device */
4568 for (i = 0; i < ent->n_ports; i++) {
4569 struct ata_port *ap;
4570 unsigned long xfer_mode_mask;
4572 ap = ata_host_add(ent, host_set, i);
4576 host_set->ports[i] = ap;
4577 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4578 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4579 (ap->pio_mask << ATA_SHIFT_PIO);
4581 /* print per-port info to dmesg */
4582 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4583 "bmdma 0x%lX irq %lu\n",
4585 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4586 ata_mode_string(xfer_mode_mask),
4587 ap->ioaddr.cmd_addr,
4588 ap->ioaddr.ctl_addr,
4589 ap->ioaddr.bmdma_addr,
4593 host_set->ops->irq_clear(ap);
4600 /* obtain irq, that is shared between channels */
4601 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4602 DRV_NAME, host_set))
4605 /* perform each probe synchronously */
4606 DPRINTK("probe begin\n");
4607 for (i = 0; i < count; i++) {
4608 struct ata_port *ap;
4611 ap = host_set->ports[i];
4613 DPRINTK("ata%u: bus probe begin\n", ap->id);
4614 rc = ata_bus_probe(ap);
4615 DPRINTK("ata%u: bus probe end\n", ap->id);
4618 /* FIXME: do something useful here?
4619 * Current libata behavior will
4620 * tear down everything when
4621 * the module is removed
4622 * or the h/w is unplugged.
4626 rc = scsi_add_host(ap->host, dev);
4628 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4630 /* FIXME: do something useful here */
4631 /* FIXME: handle unconditional calls to
4632 * scsi_scan_host and ata_host_remove, below,
4638 /* probes are done, now scan each port's disk(s) */
4639 DPRINTK("host probe begin\n");
4640 for (i = 0; i < count; i++) {
4641 struct ata_port *ap = host_set->ports[i];
4643 ata_scsi_scan_host(ap);
4646 dev_set_drvdata(dev, host_set);
4648 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4649 return ent->n_ports; /* success */
4652 for (i = 0; i < count; i++) {
4653 ata_host_remove(host_set->ports[i], 1);
4654 scsi_host_put(host_set->ports[i]->host);
4658 VPRINTK("EXIT, returning 0\n");
4663 * ata_host_set_remove - PCI layer callback for device removal
4664 * @host_set: ATA host set that was removed
4666 * Unregister all objects associated with this host set. Free those
4670 * Inherited from calling layer (may sleep).
4673 void ata_host_set_remove(struct ata_host_set *host_set)
4675 struct ata_port *ap;
4678 for (i = 0; i < host_set->n_ports; i++) {
4679 ap = host_set->ports[i];
4680 scsi_remove_host(ap->host);
4683 free_irq(host_set->irq, host_set);
4685 for (i = 0; i < host_set->n_ports; i++) {
4686 ap = host_set->ports[i];
4688 ata_scsi_release(ap->host);
4690 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4691 struct ata_ioports *ioaddr = &ap->ioaddr;
4693 if (ioaddr->cmd_addr == 0x1f0)
4694 release_region(0x1f0, 8);
4695 else if (ioaddr->cmd_addr == 0x170)
4696 release_region(0x170, 8);
4699 scsi_host_put(ap->host);
4702 if (host_set->ops->host_stop)
4703 host_set->ops->host_stop(host_set);
4709 * ata_scsi_release - SCSI layer callback hook for host unload
4710 * @host: libata host to be unloaded
4712 * Performs all duties necessary to shut down a libata port...
4713 * Kill port kthread, disable port, and release resources.
4716 * Inherited from SCSI layer.
4722 int ata_scsi_release(struct Scsi_Host *host)
4724 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4729 ap->ops->port_disable(ap);
4730 ata_host_remove(ap, 0);
4731 for (i = 0; i < ATA_MAX_DEVICES; i++)
4732 kfree(ap->device[i].id);
4739 * ata_std_ports - initialize ioaddr with standard port offsets.
4740 * @ioaddr: IO address structure to be initialized
4742 * Utility function which initializes data_addr, error_addr,
4743 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4744 * device_addr, status_addr, and command_addr to standard offsets
4745 * relative to cmd_addr.
4747 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4750 void ata_std_ports(struct ata_ioports *ioaddr)
4752 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4753 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4754 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4755 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4756 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4757 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4758 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4759 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4760 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4761 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4767 void ata_pci_host_stop (struct ata_host_set *host_set)
4769 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4771 pci_iounmap(pdev, host_set->mmio_base);
4775 * ata_pci_remove_one - PCI layer callback for device removal
4776 * @pdev: PCI device that was removed
4778 * PCI layer indicates to libata via this hook that
4779 * hot-unplug or module unload event has occurred.
4780 * Handle this by unregistering all objects associated
4781 * with this PCI device. Free those objects. Then finally
4782 * release PCI resources and disable device.
4785 * Inherited from PCI layer (may sleep).
4788 void ata_pci_remove_one (struct pci_dev *pdev)
4790 struct device *dev = pci_dev_to_dev(pdev);
4791 struct ata_host_set *host_set = dev_get_drvdata(dev);
4793 ata_host_set_remove(host_set);
4794 pci_release_regions(pdev);
4795 pci_disable_device(pdev);
4796 dev_set_drvdata(dev, NULL);
4799 /* move to PCI subsystem */
4800 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4802 unsigned long tmp = 0;
4804 switch (bits->width) {
4807 pci_read_config_byte(pdev, bits->reg, &tmp8);
4813 pci_read_config_word(pdev, bits->reg, &tmp16);
4819 pci_read_config_dword(pdev, bits->reg, &tmp32);
4830 return (tmp == bits->val) ? 1 : 0;
4833 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4835 pci_save_state(pdev);
4836 pci_disable_device(pdev);
4837 pci_set_power_state(pdev, PCI_D3hot);
4841 int ata_pci_device_resume(struct pci_dev *pdev)
4843 pci_set_power_state(pdev, PCI_D0);
4844 pci_restore_state(pdev);
4845 pci_enable_device(pdev);
4846 pci_set_master(pdev);
4849 #endif /* CONFIG_PCI */
4852 static int __init ata_init(void)
4854 ata_wq = create_workqueue("ata");
4858 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4862 static void __exit ata_exit(void)
4864 destroy_workqueue(ata_wq);
4867 module_init(ata_init);
4868 module_exit(ata_exit);
4870 static unsigned long ratelimit_time;
4871 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4873 int ata_ratelimit(void)
4876 unsigned long flags;
4878 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4880 if (time_after(jiffies, ratelimit_time)) {
4882 ratelimit_time = jiffies + (HZ/5);
4886 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4892 * libata is essentially a library of internal helper functions for
4893 * low-level ATA host controller drivers. As such, the API/ABI is
4894 * likely to change as new drivers are added and updated.
4895 * Do not depend on ABI/API stability.
4898 EXPORT_SYMBOL_GPL(ata_std_bios_param);
4899 EXPORT_SYMBOL_GPL(ata_std_ports);
4900 EXPORT_SYMBOL_GPL(ata_device_add);
4901 EXPORT_SYMBOL_GPL(ata_host_set_remove);
4902 EXPORT_SYMBOL_GPL(ata_sg_init);
4903 EXPORT_SYMBOL_GPL(ata_sg_init_one);
4904 EXPORT_SYMBOL_GPL(__ata_qc_complete);
4905 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4906 EXPORT_SYMBOL_GPL(ata_eng_timeout);
4907 EXPORT_SYMBOL_GPL(ata_tf_load);
4908 EXPORT_SYMBOL_GPL(ata_tf_read);
4909 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4910 EXPORT_SYMBOL_GPL(ata_std_dev_select);
4911 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4912 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4913 EXPORT_SYMBOL_GPL(ata_check_status);
4914 EXPORT_SYMBOL_GPL(ata_altstatus);
4915 EXPORT_SYMBOL_GPL(ata_exec_command);
4916 EXPORT_SYMBOL_GPL(ata_port_start);
4917 EXPORT_SYMBOL_GPL(ata_port_stop);
4918 EXPORT_SYMBOL_GPL(ata_host_stop);
4919 EXPORT_SYMBOL_GPL(ata_interrupt);
4920 EXPORT_SYMBOL_GPL(ata_qc_prep);
4921 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
4922 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4923 EXPORT_SYMBOL_GPL(ata_bmdma_start);
4924 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4925 EXPORT_SYMBOL_GPL(ata_bmdma_status);
4926 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4927 EXPORT_SYMBOL_GPL(ata_port_probe);
4928 EXPORT_SYMBOL_GPL(sata_phy_reset);
4929 EXPORT_SYMBOL_GPL(__sata_phy_reset);
4930 EXPORT_SYMBOL_GPL(ata_bus_reset);
4931 EXPORT_SYMBOL_GPL(ata_std_probeinit);
4932 EXPORT_SYMBOL_GPL(ata_std_softreset);
4933 EXPORT_SYMBOL_GPL(sata_std_hardreset);
4934 EXPORT_SYMBOL_GPL(ata_std_postreset);
4935 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
4936 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
4937 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
4938 EXPORT_SYMBOL_GPL(ata_port_disable);
4939 EXPORT_SYMBOL_GPL(ata_ratelimit);
4940 EXPORT_SYMBOL_GPL(ata_busy_sleep);
4941 EXPORT_SYMBOL_GPL(ata_port_queue_task);
4942 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
4943 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4944 EXPORT_SYMBOL_GPL(ata_scsi_error);
4945 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
4946 EXPORT_SYMBOL_GPL(ata_scsi_release);
4947 EXPORT_SYMBOL_GPL(ata_host_intr);
4948 EXPORT_SYMBOL_GPL(ata_dev_classify);
4949 EXPORT_SYMBOL_GPL(ata_id_string);
4950 EXPORT_SYMBOL_GPL(ata_id_c_string);
4951 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
4952 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
4953 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
4955 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
4956 EXPORT_SYMBOL_GPL(ata_timing_compute);
4957 EXPORT_SYMBOL_GPL(ata_timing_merge);
4960 EXPORT_SYMBOL_GPL(pci_test_config_bits);
4961 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
4962 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
4963 EXPORT_SYMBOL_GPL(ata_pci_init_one);
4964 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
4965 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
4966 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
4967 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
4968 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
4969 #endif /* CONFIG_PCI */
4971 EXPORT_SYMBOL_GPL(ata_device_suspend);
4972 EXPORT_SYMBOL_GPL(ata_device_resume);
4973 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
4974 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);