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 unsigned int ata_dev_xfermask(struct ata_port *ap,
69 struct ata_device *dev);
71 static unsigned int ata_unique_id = 1;
72 static struct workqueue_struct *ata_wq;
74 int atapi_enabled = 1;
75 module_param(atapi_enabled, int, 0444);
76 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
79 module_param_named(fua, libata_fua, int, 0444);
80 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
82 MODULE_AUTHOR("Jeff Garzik");
83 MODULE_DESCRIPTION("Library module for ATA devices");
84 MODULE_LICENSE("GPL");
85 MODULE_VERSION(DRV_VERSION);
89 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
90 * @tf: Taskfile to convert
91 * @fis: Buffer into which data will output
92 * @pmp: Port multiplier port
94 * Converts a standard ATA taskfile to a Serial ATA
95 * FIS structure (Register - Host to Device).
98 * Inherited from caller.
101 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
103 fis[0] = 0x27; /* Register - Host to Device FIS */
104 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
105 bit 7 indicates Command FIS */
106 fis[2] = tf->command;
107 fis[3] = tf->feature;
114 fis[8] = tf->hob_lbal;
115 fis[9] = tf->hob_lbam;
116 fis[10] = tf->hob_lbah;
117 fis[11] = tf->hob_feature;
120 fis[13] = tf->hob_nsect;
131 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
132 * @fis: Buffer from which data will be input
133 * @tf: Taskfile to output
135 * Converts a serial ATA FIS structure to a standard ATA taskfile.
138 * Inherited from caller.
141 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
143 tf->command = fis[2]; /* status */
144 tf->feature = fis[3]; /* error */
151 tf->hob_lbal = fis[8];
152 tf->hob_lbam = fis[9];
153 tf->hob_lbah = fis[10];
156 tf->hob_nsect = fis[13];
159 static const u8 ata_rw_cmds[] = {
163 ATA_CMD_READ_MULTI_EXT,
164 ATA_CMD_WRITE_MULTI_EXT,
168 ATA_CMD_WRITE_MULTI_FUA_EXT,
172 ATA_CMD_PIO_READ_EXT,
173 ATA_CMD_PIO_WRITE_EXT,
186 ATA_CMD_WRITE_FUA_EXT
190 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
191 * @qc: command to examine and configure
193 * Examine the device configuration and tf->flags to calculate
194 * the proper read/write commands and protocol to use.
199 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
201 struct ata_taskfile *tf = &qc->tf;
202 struct ata_device *dev = qc->dev;
205 int index, fua, lba48, write;
207 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
208 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
209 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
211 if (dev->flags & ATA_DFLAG_PIO) {
212 tf->protocol = ATA_PROT_PIO;
213 index = dev->multi_count ? 0 : 8;
214 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
215 /* Unable to use DMA due to host limitation */
216 tf->protocol = ATA_PROT_PIO;
217 index = dev->multi_count ? 0 : 8;
219 tf->protocol = ATA_PROT_DMA;
223 cmd = ata_rw_cmds[index + fua + lba48 + write];
232 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
233 * @pio_mask: pio_mask
234 * @mwdma_mask: mwdma_mask
235 * @udma_mask: udma_mask
237 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
238 * unsigned int xfer_mask.
246 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
247 unsigned int mwdma_mask,
248 unsigned int udma_mask)
250 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
251 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
252 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
255 static const struct ata_xfer_ent {
256 unsigned int shift, bits;
259 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
260 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
261 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
266 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
267 * @xfer_mask: xfer_mask of interest
269 * Return matching XFER_* value for @xfer_mask. Only the highest
270 * bit of @xfer_mask is considered.
276 * Matching XFER_* value, 0 if no match found.
278 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
280 int highbit = fls(xfer_mask) - 1;
281 const struct ata_xfer_ent *ent;
283 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
284 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
285 return ent->base + highbit - ent->shift;
290 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
291 * @xfer_mode: XFER_* of interest
293 * Return matching xfer_mask for @xfer_mode.
299 * Matching xfer_mask, 0 if no match found.
301 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
303 const struct ata_xfer_ent *ent;
305 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
306 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
307 return 1 << (ent->shift + xfer_mode - ent->base);
312 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
313 * @xfer_mode: XFER_* of interest
315 * Return matching xfer_shift for @xfer_mode.
321 * Matching xfer_shift, -1 if no match found.
323 static int ata_xfer_mode2shift(unsigned int 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)
334 * ata_mode_string - convert xfer_mask to string
335 * @xfer_mask: mask of bits supported; only highest bit counts.
337 * Determine string which represents the highest speed
338 * (highest bit in @modemask).
344 * Constant C string representing highest speed listed in
345 * @mode_mask, or the constant C string "<n/a>".
347 static const char *ata_mode_string(unsigned int xfer_mask)
349 static const char * const xfer_mode_str[] = {
369 highbit = fls(xfer_mask) - 1;
370 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
371 return xfer_mode_str[highbit];
376 * ata_pio_devchk - PATA device presence detection
377 * @ap: ATA channel to examine
378 * @device: Device to examine (starting at zero)
380 * This technique was originally described in
381 * Hale Landis's ATADRVR (www.ata-atapi.com), and
382 * later found its way into the ATA/ATAPI spec.
384 * Write a pattern to the ATA shadow registers,
385 * and if a device is present, it will respond by
386 * correctly storing and echoing back the
387 * ATA shadow register contents.
393 static unsigned int ata_pio_devchk(struct ata_port *ap,
396 struct ata_ioports *ioaddr = &ap->ioaddr;
399 ap->ops->dev_select(ap, device);
401 outb(0x55, ioaddr->nsect_addr);
402 outb(0xaa, ioaddr->lbal_addr);
404 outb(0xaa, ioaddr->nsect_addr);
405 outb(0x55, ioaddr->lbal_addr);
407 outb(0x55, ioaddr->nsect_addr);
408 outb(0xaa, ioaddr->lbal_addr);
410 nsect = inb(ioaddr->nsect_addr);
411 lbal = inb(ioaddr->lbal_addr);
413 if ((nsect == 0x55) && (lbal == 0xaa))
414 return 1; /* we found a device */
416 return 0; /* nothing found */
420 * ata_mmio_devchk - PATA device presence detection
421 * @ap: ATA channel to examine
422 * @device: Device to examine (starting at zero)
424 * This technique was originally described in
425 * Hale Landis's ATADRVR (www.ata-atapi.com), and
426 * later found its way into the ATA/ATAPI spec.
428 * Write a pattern to the ATA shadow registers,
429 * and if a device is present, it will respond by
430 * correctly storing and echoing back the
431 * ATA shadow register contents.
437 static unsigned int ata_mmio_devchk(struct ata_port *ap,
440 struct ata_ioports *ioaddr = &ap->ioaddr;
443 ap->ops->dev_select(ap, device);
445 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
446 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
448 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
449 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
451 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
452 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
454 nsect = readb((void __iomem *) ioaddr->nsect_addr);
455 lbal = readb((void __iomem *) ioaddr->lbal_addr);
457 if ((nsect == 0x55) && (lbal == 0xaa))
458 return 1; /* we found a device */
460 return 0; /* nothing found */
464 * ata_devchk - PATA device presence detection
465 * @ap: ATA channel to examine
466 * @device: Device to examine (starting at zero)
468 * Dispatch ATA device presence detection, depending
469 * on whether we are using PIO or MMIO to talk to the
470 * ATA shadow registers.
476 static unsigned int ata_devchk(struct ata_port *ap,
479 if (ap->flags & ATA_FLAG_MMIO)
480 return ata_mmio_devchk(ap, device);
481 return ata_pio_devchk(ap, device);
485 * ata_dev_classify - determine device type based on ATA-spec signature
486 * @tf: ATA taskfile register set for device to be identified
488 * Determine from taskfile register contents whether a device is
489 * ATA or ATAPI, as per "Signature and persistence" section
490 * of ATA/PI spec (volume 1, sect 5.14).
496 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
497 * the event of failure.
500 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
502 /* Apple's open source Darwin code hints that some devices only
503 * put a proper signature into the LBA mid/high registers,
504 * So, we only check those. It's sufficient for uniqueness.
507 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
508 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
509 DPRINTK("found ATA device by sig\n");
513 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
514 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
515 DPRINTK("found ATAPI device by sig\n");
516 return ATA_DEV_ATAPI;
519 DPRINTK("unknown device\n");
520 return ATA_DEV_UNKNOWN;
524 * ata_dev_try_classify - Parse returned ATA device signature
525 * @ap: ATA channel to examine
526 * @device: Device to examine (starting at zero)
527 * @r_err: Value of error register on completion
529 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
530 * an ATA/ATAPI-defined set of values is placed in the ATA
531 * shadow registers, indicating the results of device detection
534 * Select the ATA device, and read the values from the ATA shadow
535 * registers. Then parse according to the Error register value,
536 * and the spec-defined values examined by ata_dev_classify().
542 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
546 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
548 struct ata_taskfile tf;
552 ap->ops->dev_select(ap, device);
554 memset(&tf, 0, sizeof(tf));
556 ap->ops->tf_read(ap, &tf);
561 /* see if device passed diags */
564 else if ((device == 0) && (err == 0x81))
569 /* determine if device is ATA or ATAPI */
570 class = ata_dev_classify(&tf);
572 if (class == ATA_DEV_UNKNOWN)
574 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
580 * ata_id_string - Convert IDENTIFY DEVICE page into string
581 * @id: IDENTIFY DEVICE results we will examine
582 * @s: string into which data is output
583 * @ofs: offset into identify device page
584 * @len: length of string to return. must be an even number.
586 * The strings in the IDENTIFY DEVICE page are broken up into
587 * 16-bit chunks. Run through the string, and output each
588 * 8-bit chunk linearly, regardless of platform.
594 void ata_id_string(const u16 *id, unsigned char *s,
595 unsigned int ofs, unsigned int len)
614 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
615 * @id: IDENTIFY DEVICE results we will examine
616 * @s: string into which data is output
617 * @ofs: offset into identify device page
618 * @len: length of string to return. must be an odd number.
620 * This function is identical to ata_id_string except that it
621 * trims trailing spaces and terminates the resulting string with
622 * null. @len must be actual maximum length (even number) + 1.
627 void ata_id_c_string(const u16 *id, unsigned char *s,
628 unsigned int ofs, unsigned int len)
634 ata_id_string(id, s, ofs, len - 1);
636 p = s + strnlen(s, len - 1);
637 while (p > s && p[-1] == ' ')
642 static u64 ata_id_n_sectors(const u16 *id)
644 if (ata_id_has_lba(id)) {
645 if (ata_id_has_lba48(id))
646 return ata_id_u64(id, 100);
648 return ata_id_u32(id, 60);
650 if (ata_id_current_chs_valid(id))
651 return ata_id_u32(id, 57);
653 return id[1] * id[3] * id[6];
658 * ata_noop_dev_select - Select device 0/1 on ATA bus
659 * @ap: ATA channel to manipulate
660 * @device: ATA device (numbered from zero) to select
662 * This function performs no actual function.
664 * May be used as the dev_select() entry in ata_port_operations.
669 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
675 * ata_std_dev_select - Select device 0/1 on ATA bus
676 * @ap: ATA channel to manipulate
677 * @device: ATA device (numbered from zero) to select
679 * Use the method defined in the ATA specification to
680 * make either device 0, or device 1, active on the
681 * ATA channel. Works with both PIO and MMIO.
683 * May be used as the dev_select() entry in ata_port_operations.
689 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
694 tmp = ATA_DEVICE_OBS;
696 tmp = ATA_DEVICE_OBS | ATA_DEV1;
698 if (ap->flags & ATA_FLAG_MMIO) {
699 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
701 outb(tmp, ap->ioaddr.device_addr);
703 ata_pause(ap); /* needed; also flushes, for mmio */
707 * ata_dev_select - Select device 0/1 on ATA bus
708 * @ap: ATA channel to manipulate
709 * @device: ATA device (numbered from zero) to select
710 * @wait: non-zero to wait for Status register BSY bit to clear
711 * @can_sleep: non-zero if context allows sleeping
713 * Use the method defined in the ATA specification to
714 * make either device 0, or device 1, active on the
717 * This is a high-level version of ata_std_dev_select(),
718 * which additionally provides the services of inserting
719 * the proper pauses and status polling, where needed.
725 void ata_dev_select(struct ata_port *ap, unsigned int device,
726 unsigned int wait, unsigned int can_sleep)
728 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
729 ap->id, device, wait);
734 ap->ops->dev_select(ap, device);
737 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
744 * ata_dump_id - IDENTIFY DEVICE info debugging output
745 * @id: IDENTIFY DEVICE page to dump
747 * Dump selected 16-bit words from the given IDENTIFY DEVICE
754 static inline void ata_dump_id(const u16 *id)
756 DPRINTK("49==0x%04x "
766 DPRINTK("80==0x%04x "
776 DPRINTK("88==0x%04x "
783 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
784 * @id: IDENTIFY data to compute xfer mask from
786 * Compute the xfermask for this device. This is not as trivial
787 * as it seems if we must consider early devices correctly.
789 * FIXME: pre IDE drive timing (do we care ?).
797 static unsigned int ata_id_xfermask(const u16 *id)
799 unsigned int pio_mask, mwdma_mask, udma_mask;
801 /* Usual case. Word 53 indicates word 64 is valid */
802 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
803 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
807 /* If word 64 isn't valid then Word 51 high byte holds
808 * the PIO timing number for the maximum. Turn it into
811 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
813 /* But wait.. there's more. Design your standards by
814 * committee and you too can get a free iordy field to
815 * process. However its the speeds not the modes that
816 * are supported... Note drivers using the timing API
817 * will get this right anyway
821 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
822 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
824 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
828 * ata_port_queue_task - Queue port_task
829 * @ap: The ata_port to queue port_task for
831 * Schedule @fn(@data) for execution after @delay jiffies using
832 * port_task. There is one port_task per port and it's the
833 * user(low level driver)'s responsibility to make sure that only
834 * one task is active at any given time.
836 * libata core layer takes care of synchronization between
837 * port_task and EH. ata_port_queue_task() may be ignored for EH
841 * Inherited from caller.
843 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
848 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
851 PREPARE_WORK(&ap->port_task, fn, data);
854 rc = queue_work(ata_wq, &ap->port_task);
856 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
858 /* rc == 0 means that another user is using port task */
863 * ata_port_flush_task - Flush port_task
864 * @ap: The ata_port to flush port_task for
866 * After this function completes, port_task is guranteed not to
867 * be running or scheduled.
870 * Kernel thread context (may sleep)
872 void ata_port_flush_task(struct ata_port *ap)
878 spin_lock_irqsave(&ap->host_set->lock, flags);
879 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
880 spin_unlock_irqrestore(&ap->host_set->lock, flags);
882 DPRINTK("flush #1\n");
883 flush_workqueue(ata_wq);
886 * At this point, if a task is running, it's guaranteed to see
887 * the FLUSH flag; thus, it will never queue pio tasks again.
890 if (!cancel_delayed_work(&ap->port_task)) {
891 DPRINTK("flush #2\n");
892 flush_workqueue(ata_wq);
895 spin_lock_irqsave(&ap->host_set->lock, flags);
896 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
897 spin_unlock_irqrestore(&ap->host_set->lock, flags);
902 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
904 struct completion *waiting = qc->private_data;
906 qc->ap->ops->tf_read(qc->ap, &qc->tf);
911 * ata_exec_internal - execute libata internal command
912 * @ap: Port to which the command is sent
913 * @dev: Device to which the command is sent
914 * @tf: Taskfile registers for the command and the result
915 * @dma_dir: Data tranfer direction of the command
916 * @buf: Data buffer of the command
917 * @buflen: Length of data buffer
919 * Executes libata internal command with timeout. @tf contains
920 * command on entry and result on return. Timeout and error
921 * conditions are reported via return value. No recovery action
922 * is taken after a command times out. It's caller's duty to
923 * clean up after timeout.
926 * None. Should be called with kernel context, might sleep.
930 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
931 struct ata_taskfile *tf,
932 int dma_dir, void *buf, unsigned int buflen)
934 u8 command = tf->command;
935 struct ata_queued_cmd *qc;
936 DECLARE_COMPLETION(wait);
938 unsigned int err_mask;
940 spin_lock_irqsave(&ap->host_set->lock, flags);
942 qc = ata_qc_new_init(ap, dev);
946 qc->dma_dir = dma_dir;
947 if (dma_dir != DMA_NONE) {
948 ata_sg_init_one(qc, buf, buflen);
949 qc->nsect = buflen / ATA_SECT_SIZE;
952 qc->private_data = &wait;
953 qc->complete_fn = ata_qc_complete_internal;
955 qc->err_mask = ata_qc_issue(qc);
959 spin_unlock_irqrestore(&ap->host_set->lock, flags);
961 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
962 spin_lock_irqsave(&ap->host_set->lock, flags);
964 /* We're racing with irq here. If we lose, the
965 * following test prevents us from completing the qc
966 * again. If completion irq occurs after here but
967 * before the caller cleans up, it will result in a
968 * spurious interrupt. We can live with that.
970 if (qc->flags & ATA_QCFLAG_ACTIVE) {
971 qc->err_mask = AC_ERR_TIMEOUT;
973 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
977 spin_unlock_irqrestore(&ap->host_set->lock, flags);
981 err_mask = qc->err_mask;
989 * ata_pio_need_iordy - check if iordy needed
992 * Check if the current speed of the device requires IORDY. Used
993 * by various controllers for chip configuration.
996 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
999 int speed = adev->pio_mode - XFER_PIO_0;
1006 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1008 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1009 pio = adev->id[ATA_ID_EIDE_PIO];
1010 /* Is the speed faster than the drive allows non IORDY ? */
1012 /* This is cycle times not frequency - watch the logic! */
1013 if (pio > 240) /* PIO2 is 240nS per cycle */
1022 * ata_dev_read_id - Read ID data from the specified device
1023 * @ap: port on which target device resides
1024 * @dev: target device
1025 * @p_class: pointer to class of the target device (may be changed)
1026 * @post_reset: is this read ID post-reset?
1027 * @p_id: read IDENTIFY page (newly allocated)
1029 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1030 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1031 * devices. This function also takes care of EDD signature
1032 * misreporting (to be removed once EDD support is gone) and
1033 * issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
1036 * Kernel thread context (may sleep)
1039 * 0 on success, -errno otherwise.
1041 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
1042 unsigned int *p_class, int post_reset, u16 **p_id)
1044 unsigned int class = *p_class;
1045 unsigned int using_edd;
1046 struct ata_taskfile tf;
1047 unsigned int err_mask = 0;
1052 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1054 if (ap->ops->probe_reset ||
1055 ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
1060 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1062 id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
1065 reason = "out of memory";
1070 ata_tf_init(ap, &tf, dev->devno);
1074 tf.command = ATA_CMD_ID_ATA;
1077 tf.command = ATA_CMD_ID_ATAPI;
1081 reason = "unsupported class";
1085 tf.protocol = ATA_PROT_PIO;
1087 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
1088 id, sizeof(id[0]) * ATA_ID_WORDS);
1092 reason = "I/O error";
1094 if (err_mask & ~AC_ERR_DEV)
1098 * arg! EDD works for all test cases, but seems to return
1099 * the ATA signature for some ATAPI devices. Until the
1100 * reason for this is found and fixed, we fix up the mess
1101 * here. If IDENTIFY DEVICE returns command aborted
1102 * (as ATAPI devices do), then we issue an
1103 * IDENTIFY PACKET DEVICE.
1105 * ATA software reset (SRST, the default) does not appear
1106 * to have this problem.
1108 if ((using_edd) && (class == ATA_DEV_ATA)) {
1109 u8 err = tf.feature;
1110 if (err & ATA_ABORTED) {
1111 class = ATA_DEV_ATAPI;
1118 swap_buf_le16(id, ATA_ID_WORDS);
1120 /* print device capabilities */
1121 printk(KERN_DEBUG "ata%u: dev %u cfg "
1122 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1124 id[49], id[82], id[83], id[84], id[85], id[86], id[87], id[88]);
1127 if ((class == ATA_DEV_ATA) != ata_id_is_ata(id)) {
1129 reason = "device reports illegal type";
1133 if (post_reset && class == ATA_DEV_ATA) {
1135 * The exact sequence expected by certain pre-ATA4 drives is:
1138 * INITIALIZE DEVICE PARAMETERS
1140 * Some drives were very specific about that exact sequence.
1142 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1143 err_mask = ata_dev_init_params(ap, dev);
1146 reason = "INIT_DEV_PARAMS failed";
1150 /* current CHS translation info (id[53-58]) might be
1151 * changed. reread the identify device info.
1163 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1164 ap->id, dev->devno, reason);
1169 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1170 struct ata_device *dev)
1172 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1176 * ata_dev_configure - Configure the specified ATA/ATAPI device
1177 * @ap: Port on which target device resides
1178 * @dev: Target device to configure
1179 * @print_info: Enable device info printout
1181 * Configure @dev according to @dev->id. Generic and low-level
1182 * driver specific fixups are also applied.
1185 * Kernel thread context (may sleep)
1188 * 0 on success, -errno otherwise
1190 static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
1193 unsigned int xfer_mask;
1196 if (!ata_dev_present(dev)) {
1197 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1198 ap->id, dev->devno);
1202 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1204 /* initialize to-be-configured parameters */
1206 dev->max_sectors = 0;
1214 * common ATA, ATAPI feature tests
1217 /* we require DMA support (bits 8 of word 49) */
1218 if (!ata_id_has_dma(dev->id)) {
1219 printk(KERN_DEBUG "ata%u: no dma\n", ap->id);
1224 /* find max transfer mode; for printk only */
1225 xfer_mask = ata_id_xfermask(dev->id);
1227 ata_dump_id(dev->id);
1229 /* ATA-specific feature tests */
1230 if (dev->class == ATA_DEV_ATA) {
1231 dev->n_sectors = ata_id_n_sectors(dev->id);
1233 if (ata_id_has_lba(dev->id)) {
1234 const char *lba_desc;
1237 dev->flags |= ATA_DFLAG_LBA;
1238 if (ata_id_has_lba48(dev->id)) {
1239 dev->flags |= ATA_DFLAG_LBA48;
1243 /* print device info to dmesg */
1245 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1246 "max %s, %Lu sectors: %s\n",
1248 ata_id_major_version(dev->id),
1249 ata_mode_string(xfer_mask),
1250 (unsigned long long)dev->n_sectors,
1255 /* Default translation */
1256 dev->cylinders = dev->id[1];
1257 dev->heads = dev->id[3];
1258 dev->sectors = dev->id[6];
1260 if (ata_id_current_chs_valid(dev->id)) {
1261 /* Current CHS translation is valid. */
1262 dev->cylinders = dev->id[54];
1263 dev->heads = dev->id[55];
1264 dev->sectors = dev->id[56];
1267 /* print device info to dmesg */
1269 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1270 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1272 ata_id_major_version(dev->id),
1273 ata_mode_string(xfer_mask),
1274 (unsigned long long)dev->n_sectors,
1275 dev->cylinders, dev->heads, dev->sectors);
1281 /* ATAPI-specific feature tests */
1282 else if (dev->class == ATA_DEV_ATAPI) {
1283 rc = atapi_cdb_len(dev->id);
1284 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1285 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1289 dev->cdb_len = (unsigned int) rc;
1291 /* print device info to dmesg */
1293 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1294 ap->id, dev->devno, ata_mode_string(xfer_mask));
1297 ap->host->max_cmd_len = 0;
1298 for (i = 0; i < ATA_MAX_DEVICES; i++)
1299 ap->host->max_cmd_len = max_t(unsigned int,
1300 ap->host->max_cmd_len,
1301 ap->device[i].cdb_len);
1303 /* limit bridge transfers to udma5, 200 sectors */
1304 if (ata_dev_knobble(ap, dev)) {
1306 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1307 ap->id, dev->devno);
1308 ap->udma_mask &= ATA_UDMA5;
1309 dev->max_sectors = ATA_MAX_SECTORS;
1312 if (ap->ops->dev_config)
1313 ap->ops->dev_config(ap, dev);
1315 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1319 printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
1320 ap->id, dev->devno);
1321 DPRINTK("EXIT, err\n");
1326 * ata_bus_probe - Reset and probe ATA bus
1329 * Master ATA bus probing function. Initiates a hardware-dependent
1330 * bus reset, then attempts to identify any devices found on
1334 * PCI/etc. bus probe sem.
1337 * Zero on success, non-zero on error.
1340 static int ata_bus_probe(struct ata_port *ap)
1342 unsigned int classes[ATA_MAX_DEVICES];
1343 unsigned int i, rc, found = 0;
1347 /* reset and determine device classes */
1348 for (i = 0; i < ATA_MAX_DEVICES; i++)
1349 classes[i] = ATA_DEV_UNKNOWN;
1351 if (ap->ops->probe_reset) {
1352 rc = ap->ops->probe_reset(ap, classes);
1354 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1358 ap->ops->phy_reset(ap);
1360 if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
1361 for (i = 0; i < ATA_MAX_DEVICES; i++)
1362 classes[i] = ap->device[i].class;
1367 for (i = 0; i < ATA_MAX_DEVICES; i++)
1368 if (classes[i] == ATA_DEV_UNKNOWN)
1369 classes[i] = ATA_DEV_NONE;
1371 /* read IDENTIFY page and configure devices */
1372 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1373 struct ata_device *dev = &ap->device[i];
1375 dev->class = classes[i];
1377 if (!ata_dev_present(dev))
1380 WARN_ON(dev->id != NULL);
1381 if (ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id)) {
1382 dev->class = ATA_DEV_NONE;
1386 if (ata_dev_configure(ap, dev, 1)) {
1387 dev->class++; /* disable device */
1395 goto err_out_disable;
1398 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1399 goto err_out_disable;
1404 ap->ops->port_disable(ap);
1409 * ata_port_probe - Mark port as enabled
1410 * @ap: Port for which we indicate enablement
1412 * Modify @ap data structure such that the system
1413 * thinks that the entire port is enabled.
1415 * LOCKING: host_set lock, or some other form of
1419 void ata_port_probe(struct ata_port *ap)
1421 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1425 * sata_print_link_status - Print SATA link status
1426 * @ap: SATA port to printk link status about
1428 * This function prints link speed and status of a SATA link.
1433 static void sata_print_link_status(struct ata_port *ap)
1438 if (!ap->ops->scr_read)
1441 sstatus = scr_read(ap, SCR_STATUS);
1443 if (sata_dev_present(ap)) {
1444 tmp = (sstatus >> 4) & 0xf;
1447 else if (tmp & (1 << 1))
1450 speed = "<unknown>";
1451 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1452 ap->id, speed, sstatus);
1454 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1460 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1461 * @ap: SATA port associated with target SATA PHY.
1463 * This function issues commands to standard SATA Sxxx
1464 * PHY registers, to wake up the phy (and device), and
1465 * clear any reset condition.
1468 * PCI/etc. bus probe sem.
1471 void __sata_phy_reset(struct ata_port *ap)
1474 unsigned long timeout = jiffies + (HZ * 5);
1476 if (ap->flags & ATA_FLAG_SATA_RESET) {
1477 /* issue phy wake/reset */
1478 scr_write_flush(ap, SCR_CONTROL, 0x301);
1479 /* Couldn't find anything in SATA I/II specs, but
1480 * AHCI-1.1 10.4.2 says at least 1 ms. */
1483 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1485 /* wait for phy to become ready, if necessary */
1488 sstatus = scr_read(ap, SCR_STATUS);
1489 if ((sstatus & 0xf) != 1)
1491 } while (time_before(jiffies, timeout));
1493 /* print link status */
1494 sata_print_link_status(ap);
1496 /* TODO: phy layer with polling, timeouts, etc. */
1497 if (sata_dev_present(ap))
1500 ata_port_disable(ap);
1502 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1505 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1506 ata_port_disable(ap);
1510 ap->cbl = ATA_CBL_SATA;
1514 * sata_phy_reset - Reset SATA bus.
1515 * @ap: SATA port associated with target SATA PHY.
1517 * This function resets the SATA bus, and then probes
1518 * the bus for devices.
1521 * PCI/etc. bus probe sem.
1524 void sata_phy_reset(struct ata_port *ap)
1526 __sata_phy_reset(ap);
1527 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1533 * ata_port_disable - Disable port.
1534 * @ap: Port to be disabled.
1536 * Modify @ap data structure such that the system
1537 * thinks that the entire port is disabled, and should
1538 * never attempt to probe or communicate with devices
1541 * LOCKING: host_set lock, or some other form of
1545 void ata_port_disable(struct ata_port *ap)
1547 ap->device[0].class = ATA_DEV_NONE;
1548 ap->device[1].class = ATA_DEV_NONE;
1549 ap->flags |= ATA_FLAG_PORT_DISABLED;
1553 * This mode timing computation functionality is ported over from
1554 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1557 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1558 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1559 * for PIO 5, which is a nonstandard extension and UDMA6, which
1560 * is currently supported only by Maxtor drives.
1563 static const struct ata_timing ata_timing[] = {
1565 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1566 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1567 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1568 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1570 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1571 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1572 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1574 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1576 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1577 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1578 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1580 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1581 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1582 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1584 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1585 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1586 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1588 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1589 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1590 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1592 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1597 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1598 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1600 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1602 q->setup = EZ(t->setup * 1000, T);
1603 q->act8b = EZ(t->act8b * 1000, T);
1604 q->rec8b = EZ(t->rec8b * 1000, T);
1605 q->cyc8b = EZ(t->cyc8b * 1000, T);
1606 q->active = EZ(t->active * 1000, T);
1607 q->recover = EZ(t->recover * 1000, T);
1608 q->cycle = EZ(t->cycle * 1000, T);
1609 q->udma = EZ(t->udma * 1000, UT);
1612 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1613 struct ata_timing *m, unsigned int what)
1615 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1616 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1617 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1618 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1619 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1620 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1621 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1622 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1625 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1627 const struct ata_timing *t;
1629 for (t = ata_timing; t->mode != speed; t++)
1630 if (t->mode == 0xFF)
1635 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1636 struct ata_timing *t, int T, int UT)
1638 const struct ata_timing *s;
1639 struct ata_timing p;
1645 if (!(s = ata_timing_find_mode(speed)))
1648 memcpy(t, s, sizeof(*s));
1651 * If the drive is an EIDE drive, it can tell us it needs extended
1652 * PIO/MW_DMA cycle timing.
1655 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1656 memset(&p, 0, sizeof(p));
1657 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1658 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1659 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1660 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1661 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1663 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1667 * Convert the timing to bus clock counts.
1670 ata_timing_quantize(t, t, T, UT);
1673 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1674 * S.M.A.R.T * and some other commands. We have to ensure that the
1675 * DMA cycle timing is slower/equal than the fastest PIO timing.
1678 if (speed > XFER_PIO_4) {
1679 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1680 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1684 * Lengthen active & recovery time so that cycle time is correct.
1687 if (t->act8b + t->rec8b < t->cyc8b) {
1688 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1689 t->rec8b = t->cyc8b - t->act8b;
1692 if (t->active + t->recover < t->cycle) {
1693 t->active += (t->cycle - (t->active + t->recover)) / 2;
1694 t->recover = t->cycle - t->active;
1700 static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1702 if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1705 if (dev->xfer_shift == ATA_SHIFT_PIO)
1706 dev->flags |= ATA_DFLAG_PIO;
1708 ata_dev_set_xfermode(ap, dev);
1710 if (ata_dev_revalidate(ap, dev, 0)) {
1711 printk(KERN_ERR "ata%u: failed to revalidate after set "
1712 "xfermode, disabled\n", ap->id);
1713 ata_port_disable(ap);
1716 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1717 dev->xfer_shift, (int)dev->xfer_mode);
1719 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1721 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1724 static int ata_host_set_pio(struct ata_port *ap)
1728 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1729 struct ata_device *dev = &ap->device[i];
1731 if (!ata_dev_present(dev))
1734 if (!dev->pio_mode) {
1735 printk(KERN_WARNING "ata%u: no PIO support\n", ap->id);
1739 dev->xfer_mode = dev->pio_mode;
1740 dev->xfer_shift = ATA_SHIFT_PIO;
1741 if (ap->ops->set_piomode)
1742 ap->ops->set_piomode(ap, dev);
1748 static void ata_host_set_dma(struct ata_port *ap)
1752 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1753 struct ata_device *dev = &ap->device[i];
1755 if (!ata_dev_present(dev) || !dev->dma_mode)
1758 dev->xfer_mode = dev->dma_mode;
1759 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
1760 if (ap->ops->set_dmamode)
1761 ap->ops->set_dmamode(ap, dev);
1766 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1767 * @ap: port on which timings will be programmed
1769 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1772 * PCI/etc. bus probe sem.
1774 static void ata_set_mode(struct ata_port *ap)
1778 /* step 1: calculate xfer_mask */
1779 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1780 struct ata_device *dev = &ap->device[i];
1781 unsigned int xfer_mask;
1783 if (!ata_dev_present(dev))
1786 xfer_mask = ata_dev_xfermask(ap, dev);
1788 dev->pio_mode = ata_xfer_mask2mode(xfer_mask & ATA_MASK_PIO);
1789 dev->dma_mode = ata_xfer_mask2mode(xfer_mask & (ATA_MASK_MWDMA |
1793 /* step 2: always set host PIO timings */
1794 rc = ata_host_set_pio(ap);
1798 /* step 3: set host DMA timings */
1799 ata_host_set_dma(ap);
1801 /* step 4: update devices' xfer mode */
1802 for (i = 0; i < ATA_MAX_DEVICES; i++)
1803 ata_dev_set_mode(ap, &ap->device[i]);
1805 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1808 if (ap->ops->post_set_mode)
1809 ap->ops->post_set_mode(ap);
1814 ata_port_disable(ap);
1818 * ata_tf_to_host - issue ATA taskfile to host controller
1819 * @ap: port to which command is being issued
1820 * @tf: ATA taskfile register set
1822 * Issues ATA taskfile register set to ATA host controller,
1823 * with proper synchronization with interrupt handler and
1827 * spin_lock_irqsave(host_set lock)
1830 static inline void ata_tf_to_host(struct ata_port *ap,
1831 const struct ata_taskfile *tf)
1833 ap->ops->tf_load(ap, tf);
1834 ap->ops->exec_command(ap, tf);
1838 * ata_busy_sleep - sleep until BSY clears, or timeout
1839 * @ap: port containing status register to be polled
1840 * @tmout_pat: impatience timeout
1841 * @tmout: overall timeout
1843 * Sleep until ATA Status register bit BSY clears,
1844 * or a timeout occurs.
1849 unsigned int ata_busy_sleep (struct ata_port *ap,
1850 unsigned long tmout_pat, unsigned long tmout)
1852 unsigned long timer_start, timeout;
1855 status = ata_busy_wait(ap, ATA_BUSY, 300);
1856 timer_start = jiffies;
1857 timeout = timer_start + tmout_pat;
1858 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1860 status = ata_busy_wait(ap, ATA_BUSY, 3);
1863 if (status & ATA_BUSY)
1864 printk(KERN_WARNING "ata%u is slow to respond, "
1865 "please be patient\n", ap->id);
1867 timeout = timer_start + tmout;
1868 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1870 status = ata_chk_status(ap);
1873 if (status & ATA_BUSY) {
1874 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1875 ap->id, tmout / HZ);
1882 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1884 struct ata_ioports *ioaddr = &ap->ioaddr;
1885 unsigned int dev0 = devmask & (1 << 0);
1886 unsigned int dev1 = devmask & (1 << 1);
1887 unsigned long timeout;
1889 /* if device 0 was found in ata_devchk, wait for its
1893 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1895 /* if device 1 was found in ata_devchk, wait for
1896 * register access, then wait for BSY to clear
1898 timeout = jiffies + ATA_TMOUT_BOOT;
1902 ap->ops->dev_select(ap, 1);
1903 if (ap->flags & ATA_FLAG_MMIO) {
1904 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1905 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1907 nsect = inb(ioaddr->nsect_addr);
1908 lbal = inb(ioaddr->lbal_addr);
1910 if ((nsect == 1) && (lbal == 1))
1912 if (time_after(jiffies, timeout)) {
1916 msleep(50); /* give drive a breather */
1919 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1921 /* is all this really necessary? */
1922 ap->ops->dev_select(ap, 0);
1924 ap->ops->dev_select(ap, 1);
1926 ap->ops->dev_select(ap, 0);
1930 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1931 * @ap: Port to reset and probe
1933 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1934 * probe the bus. Not often used these days.
1937 * PCI/etc. bus probe sem.
1938 * Obtains host_set lock.
1942 static unsigned int ata_bus_edd(struct ata_port *ap)
1944 struct ata_taskfile tf;
1945 unsigned long flags;
1947 /* set up execute-device-diag (bus reset) taskfile */
1948 /* also, take interrupts to a known state (disabled) */
1949 DPRINTK("execute-device-diag\n");
1950 ata_tf_init(ap, &tf, 0);
1952 tf.command = ATA_CMD_EDD;
1953 tf.protocol = ATA_PROT_NODATA;
1956 spin_lock_irqsave(&ap->host_set->lock, flags);
1957 ata_tf_to_host(ap, &tf);
1958 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1960 /* spec says at least 2ms. but who knows with those
1961 * crazy ATAPI devices...
1965 return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1968 static unsigned int ata_bus_softreset(struct ata_port *ap,
1969 unsigned int devmask)
1971 struct ata_ioports *ioaddr = &ap->ioaddr;
1973 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
1975 /* software reset. causes dev0 to be selected */
1976 if (ap->flags & ATA_FLAG_MMIO) {
1977 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1978 udelay(20); /* FIXME: flush */
1979 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
1980 udelay(20); /* FIXME: flush */
1981 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1983 outb(ap->ctl, ioaddr->ctl_addr);
1985 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
1987 outb(ap->ctl, ioaddr->ctl_addr);
1990 /* spec mandates ">= 2ms" before checking status.
1991 * We wait 150ms, because that was the magic delay used for
1992 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1993 * between when the ATA command register is written, and then
1994 * status is checked. Because waiting for "a while" before
1995 * checking status is fine, post SRST, we perform this magic
1996 * delay here as well.
2000 ata_bus_post_reset(ap, devmask);
2006 * ata_bus_reset - reset host port and associated ATA channel
2007 * @ap: port to reset
2009 * This is typically the first time we actually start issuing
2010 * commands to the ATA channel. We wait for BSY to clear, then
2011 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2012 * result. Determine what devices, if any, are on the channel
2013 * by looking at the device 0/1 error register. Look at the signature
2014 * stored in each device's taskfile registers, to determine if
2015 * the device is ATA or ATAPI.
2018 * PCI/etc. bus probe sem.
2019 * Obtains host_set lock.
2022 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2025 void ata_bus_reset(struct ata_port *ap)
2027 struct ata_ioports *ioaddr = &ap->ioaddr;
2028 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2030 unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
2032 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2034 /* determine if device 0/1 are present */
2035 if (ap->flags & ATA_FLAG_SATA_RESET)
2038 dev0 = ata_devchk(ap, 0);
2040 dev1 = ata_devchk(ap, 1);
2044 devmask |= (1 << 0);
2046 devmask |= (1 << 1);
2048 /* select device 0 again */
2049 ap->ops->dev_select(ap, 0);
2051 /* issue bus reset */
2052 if (ap->flags & ATA_FLAG_SRST)
2053 rc = ata_bus_softreset(ap, devmask);
2054 else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
2055 /* set up device control */
2056 if (ap->flags & ATA_FLAG_MMIO)
2057 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2059 outb(ap->ctl, ioaddr->ctl_addr);
2060 rc = ata_bus_edd(ap);
2067 * determine by signature whether we have ATA or ATAPI devices
2069 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2070 if ((slave_possible) && (err != 0x81))
2071 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2073 /* re-enable interrupts */
2074 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2077 /* is double-select really necessary? */
2078 if (ap->device[1].class != ATA_DEV_NONE)
2079 ap->ops->dev_select(ap, 1);
2080 if (ap->device[0].class != ATA_DEV_NONE)
2081 ap->ops->dev_select(ap, 0);
2083 /* if no devices were detected, disable this port */
2084 if ((ap->device[0].class == ATA_DEV_NONE) &&
2085 (ap->device[1].class == ATA_DEV_NONE))
2088 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2089 /* set up device control for ATA_FLAG_SATA_RESET */
2090 if (ap->flags & ATA_FLAG_MMIO)
2091 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2093 outb(ap->ctl, ioaddr->ctl_addr);
2100 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2101 ap->ops->port_disable(ap);
2106 static int sata_phy_resume(struct ata_port *ap)
2108 unsigned long timeout = jiffies + (HZ * 5);
2111 scr_write_flush(ap, SCR_CONTROL, 0x300);
2113 /* Wait for phy to become ready, if necessary. */
2116 sstatus = scr_read(ap, SCR_STATUS);
2117 if ((sstatus & 0xf) != 1)
2119 } while (time_before(jiffies, timeout));
2125 * ata_std_probeinit - initialize probing
2126 * @ap: port to be probed
2128 * @ap is about to be probed. Initialize it. This function is
2129 * to be used as standard callback for ata_drive_probe_reset().
2131 * NOTE!!! Do not use this function as probeinit if a low level
2132 * driver implements only hardreset. Just pass NULL as probeinit
2133 * in that case. Using this function is probably okay but doing
2134 * so makes reset sequence different from the original
2135 * ->phy_reset implementation and Jeff nervous. :-P
2137 extern void ata_std_probeinit(struct ata_port *ap)
2139 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
2140 sata_phy_resume(ap);
2141 if (sata_dev_present(ap))
2142 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2147 * ata_std_softreset - reset host port via ATA SRST
2148 * @ap: port to reset
2149 * @verbose: fail verbosely
2150 * @classes: resulting classes of attached devices
2152 * Reset host port using ATA SRST. This function is to be used
2153 * as standard callback for ata_drive_*_reset() functions.
2156 * Kernel thread context (may sleep)
2159 * 0 on success, -errno otherwise.
2161 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2163 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2164 unsigned int devmask = 0, err_mask;
2169 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2170 classes[0] = ATA_DEV_NONE;
2174 /* determine if device 0/1 are present */
2175 if (ata_devchk(ap, 0))
2176 devmask |= (1 << 0);
2177 if (slave_possible && ata_devchk(ap, 1))
2178 devmask |= (1 << 1);
2180 /* select device 0 again */
2181 ap->ops->dev_select(ap, 0);
2183 /* issue bus reset */
2184 DPRINTK("about to softreset, devmask=%x\n", devmask);
2185 err_mask = ata_bus_softreset(ap, devmask);
2188 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2191 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2196 /* determine by signature whether we have ATA or ATAPI devices */
2197 classes[0] = ata_dev_try_classify(ap, 0, &err);
2198 if (slave_possible && err != 0x81)
2199 classes[1] = ata_dev_try_classify(ap, 1, &err);
2202 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2207 * sata_std_hardreset - reset host port via SATA phy reset
2208 * @ap: port to reset
2209 * @verbose: fail verbosely
2210 * @class: resulting class of attached device
2212 * SATA phy-reset host port using DET bits of SControl register.
2213 * This function is to be used as standard callback for
2214 * ata_drive_*_reset().
2217 * Kernel thread context (may sleep)
2220 * 0 on success, -errno otherwise.
2222 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2226 /* Issue phy wake/reset */
2227 scr_write_flush(ap, SCR_CONTROL, 0x301);
2230 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2231 * 10.4.2 says at least 1 ms.
2235 /* Bring phy back */
2236 sata_phy_resume(ap);
2238 /* TODO: phy layer with polling, timeouts, etc. */
2239 if (!sata_dev_present(ap)) {
2240 *class = ATA_DEV_NONE;
2241 DPRINTK("EXIT, link offline\n");
2245 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2247 printk(KERN_ERR "ata%u: COMRESET failed "
2248 "(device not ready)\n", ap->id);
2250 DPRINTK("EXIT, device not ready\n");
2254 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2256 *class = ata_dev_try_classify(ap, 0, NULL);
2258 DPRINTK("EXIT, class=%u\n", *class);
2263 * ata_std_postreset - standard postreset callback
2264 * @ap: the target ata_port
2265 * @classes: classes of attached devices
2267 * This function is invoked after a successful reset. Note that
2268 * the device might have been reset more than once using
2269 * different reset methods before postreset is invoked.
2271 * This function is to be used as standard callback for
2272 * ata_drive_*_reset().
2275 * Kernel thread context (may sleep)
2277 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2281 /* set cable type if it isn't already set */
2282 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2283 ap->cbl = ATA_CBL_SATA;
2285 /* print link status */
2286 if (ap->cbl == ATA_CBL_SATA)
2287 sata_print_link_status(ap);
2289 /* re-enable interrupts */
2290 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2293 /* is double-select really necessary? */
2294 if (classes[0] != ATA_DEV_NONE)
2295 ap->ops->dev_select(ap, 1);
2296 if (classes[1] != ATA_DEV_NONE)
2297 ap->ops->dev_select(ap, 0);
2299 /* bail out if no device is present */
2300 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2301 DPRINTK("EXIT, no device\n");
2305 /* set up device control */
2306 if (ap->ioaddr.ctl_addr) {
2307 if (ap->flags & ATA_FLAG_MMIO)
2308 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2310 outb(ap->ctl, ap->ioaddr.ctl_addr);
2317 * ata_std_probe_reset - standard probe reset method
2318 * @ap: prot to perform probe-reset
2319 * @classes: resulting classes of attached devices
2321 * The stock off-the-shelf ->probe_reset method.
2324 * Kernel thread context (may sleep)
2327 * 0 on success, -errno otherwise.
2329 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2331 ata_reset_fn_t hardreset;
2334 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2335 hardreset = sata_std_hardreset;
2337 return ata_drive_probe_reset(ap, ata_std_probeinit,
2338 ata_std_softreset, hardreset,
2339 ata_std_postreset, classes);
2342 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2343 ata_postreset_fn_t postreset,
2344 unsigned int *classes)
2348 for (i = 0; i < ATA_MAX_DEVICES; i++)
2349 classes[i] = ATA_DEV_UNKNOWN;
2351 rc = reset(ap, 0, classes);
2355 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2356 * is complete and convert all ATA_DEV_UNKNOWN to
2359 for (i = 0; i < ATA_MAX_DEVICES; i++)
2360 if (classes[i] != ATA_DEV_UNKNOWN)
2363 if (i < ATA_MAX_DEVICES)
2364 for (i = 0; i < ATA_MAX_DEVICES; i++)
2365 if (classes[i] == ATA_DEV_UNKNOWN)
2366 classes[i] = ATA_DEV_NONE;
2369 postreset(ap, classes);
2371 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2375 * ata_drive_probe_reset - Perform probe reset with given methods
2376 * @ap: port to reset
2377 * @probeinit: probeinit method (can be NULL)
2378 * @softreset: softreset method (can be NULL)
2379 * @hardreset: hardreset method (can be NULL)
2380 * @postreset: postreset method (can be NULL)
2381 * @classes: resulting classes of attached devices
2383 * Reset the specified port and classify attached devices using
2384 * given methods. This function prefers softreset but tries all
2385 * possible reset sequences to reset and classify devices. This
2386 * function is intended to be used for constructing ->probe_reset
2387 * callback by low level drivers.
2389 * Reset methods should follow the following rules.
2391 * - Return 0 on sucess, -errno on failure.
2392 * - If classification is supported, fill classes[] with
2393 * recognized class codes.
2394 * - If classification is not supported, leave classes[] alone.
2395 * - If verbose is non-zero, print error message on failure;
2396 * otherwise, shut up.
2399 * Kernel thread context (may sleep)
2402 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2403 * if classification fails, and any error code from reset
2406 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2407 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2408 ata_postreset_fn_t postreset, unsigned int *classes)
2416 rc = do_probe_reset(ap, softreset, postreset, classes);
2424 rc = do_probe_reset(ap, hardreset, postreset, classes);
2425 if (rc == 0 || rc != -ENODEV)
2429 rc = do_probe_reset(ap, softreset, postreset, classes);
2435 * ata_dev_same_device - Determine whether new ID matches configured device
2436 * @ap: port on which the device to compare against resides
2437 * @dev: device to compare against
2438 * @new_class: class of the new device
2439 * @new_id: IDENTIFY page of the new device
2441 * Compare @new_class and @new_id against @dev and determine
2442 * whether @dev is the device indicated by @new_class and
2449 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2451 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2452 unsigned int new_class, const u16 *new_id)
2454 const u16 *old_id = dev->id;
2455 unsigned char model[2][41], serial[2][21];
2458 if (dev->class != new_class) {
2460 "ata%u: dev %u class mismatch %d != %d\n",
2461 ap->id, dev->devno, dev->class, new_class);
2465 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2466 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2467 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2468 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2469 new_n_sectors = ata_id_n_sectors(new_id);
2471 if (strcmp(model[0], model[1])) {
2473 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2474 ap->id, dev->devno, model[0], model[1]);
2478 if (strcmp(serial[0], serial[1])) {
2480 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2481 ap->id, dev->devno, serial[0], serial[1]);
2485 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2487 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2488 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2489 (unsigned long long)new_n_sectors);
2497 * ata_dev_revalidate - Revalidate ATA device
2498 * @ap: port on which the device to revalidate resides
2499 * @dev: device to revalidate
2500 * @post_reset: is this revalidation after reset?
2502 * Re-read IDENTIFY page and make sure @dev is still attached to
2506 * Kernel thread context (may sleep)
2509 * 0 on success, negative errno otherwise
2511 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2518 if (!ata_dev_present(dev))
2524 /* allocate & read ID data */
2525 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2529 /* is the device still there? */
2530 if (!ata_dev_same_device(ap, dev, class, id)) {
2538 /* configure device according to the new ID */
2539 return ata_dev_configure(ap, dev, 0);
2542 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2543 ap->id, dev->devno, rc);
2548 static const char * const ata_dma_blacklist [] = {
2567 "Toshiba CD-ROM XM-6202B",
2568 "TOSHIBA CD-ROM XM-1702BC",
2570 "E-IDE CD-ROM CR-840",
2573 "SAMSUNG CD-ROM SC-148C",
2574 "SAMSUNG CD-ROM SC",
2576 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2580 static int ata_dma_blacklisted(const struct ata_device *dev)
2582 unsigned char model_num[41];
2585 ata_id_c_string(dev->id, model_num, ATA_ID_PROD_OFS, sizeof(model_num));
2587 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i++)
2588 if (!strcmp(ata_dma_blacklist[i], model_num))
2595 * ata_dev_xfermask - Compute supported xfermask of the given device
2596 * @ap: Port on which the device to compute xfermask for resides
2597 * @dev: Device to compute xfermask for
2599 * Compute supported xfermask of @dev. This function is
2600 * responsible for applying all known limits including host
2601 * controller limits, device blacklist, etc...
2607 * Computed xfermask.
2609 static unsigned int ata_dev_xfermask(struct ata_port *ap,
2610 struct ata_device *dev)
2612 unsigned long xfer_mask;
2615 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
2618 /* use port-wide xfermask for now */
2619 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2620 struct ata_device *d = &ap->device[i];
2621 if (!ata_dev_present(d))
2623 xfer_mask &= ata_id_xfermask(d->id);
2624 if (ata_dma_blacklisted(d))
2625 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2628 if (ata_dma_blacklisted(dev))
2629 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2630 "disabling DMA\n", ap->id, dev->devno);
2636 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2637 * @ap: Port associated with device @dev
2638 * @dev: Device to which command will be sent
2640 * Issue SET FEATURES - XFER MODE command to device @dev
2644 * PCI/etc. bus probe sem.
2647 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
2649 struct ata_taskfile tf;
2651 /* set up set-features taskfile */
2652 DPRINTK("set features - xfer mode\n");
2654 ata_tf_init(ap, &tf, dev->devno);
2655 tf.command = ATA_CMD_SET_FEATURES;
2656 tf.feature = SETFEATURES_XFER;
2657 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2658 tf.protocol = ATA_PROT_NODATA;
2659 tf.nsect = dev->xfer_mode;
2661 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2662 printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
2664 ata_port_disable(ap);
2671 * ata_dev_init_params - Issue INIT DEV PARAMS command
2672 * @ap: Port associated with device @dev
2673 * @dev: Device to which command will be sent
2676 * Kernel thread context (may sleep)
2679 * 0 on success, AC_ERR_* mask otherwise.
2682 static unsigned int ata_dev_init_params(struct ata_port *ap,
2683 struct ata_device *dev)
2685 struct ata_taskfile tf;
2686 unsigned int err_mask;
2687 u16 sectors = dev->id[6];
2688 u16 heads = dev->id[3];
2690 /* Number of sectors per track 1-255. Number of heads 1-16 */
2691 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2694 /* set up init dev params taskfile */
2695 DPRINTK("init dev params \n");
2697 ata_tf_init(ap, &tf, dev->devno);
2698 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2699 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2700 tf.protocol = ATA_PROT_NODATA;
2702 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2704 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2706 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2711 * ata_sg_clean - Unmap DMA memory associated with command
2712 * @qc: Command containing DMA memory to be released
2714 * Unmap all mapped DMA memory associated with this command.
2717 * spin_lock_irqsave(host_set lock)
2720 static void ata_sg_clean(struct ata_queued_cmd *qc)
2722 struct ata_port *ap = qc->ap;
2723 struct scatterlist *sg = qc->__sg;
2724 int dir = qc->dma_dir;
2725 void *pad_buf = NULL;
2727 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2728 WARN_ON(sg == NULL);
2730 if (qc->flags & ATA_QCFLAG_SINGLE)
2731 WARN_ON(qc->n_elem > 1);
2733 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2735 /* if we padded the buffer out to 32-bit bound, and data
2736 * xfer direction is from-device, we must copy from the
2737 * pad buffer back into the supplied buffer
2739 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2740 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2742 if (qc->flags & ATA_QCFLAG_SG) {
2744 dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
2745 /* restore last sg */
2746 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2748 struct scatterlist *psg = &qc->pad_sgent;
2749 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2750 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2751 kunmap_atomic(addr, KM_IRQ0);
2755 dma_unmap_single(ap->host_set->dev,
2756 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2759 sg->length += qc->pad_len;
2761 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2762 pad_buf, qc->pad_len);
2765 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2770 * ata_fill_sg - Fill PCI IDE PRD table
2771 * @qc: Metadata associated with taskfile to be transferred
2773 * Fill PCI IDE PRD (scatter-gather) table with segments
2774 * associated with the current disk command.
2777 * spin_lock_irqsave(host_set lock)
2780 static void ata_fill_sg(struct ata_queued_cmd *qc)
2782 struct ata_port *ap = qc->ap;
2783 struct scatterlist *sg;
2786 WARN_ON(qc->__sg == NULL);
2787 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2790 ata_for_each_sg(sg, qc) {
2794 /* determine if physical DMA addr spans 64K boundary.
2795 * Note h/w doesn't support 64-bit, so we unconditionally
2796 * truncate dma_addr_t to u32.
2798 addr = (u32) sg_dma_address(sg);
2799 sg_len = sg_dma_len(sg);
2802 offset = addr & 0xffff;
2804 if ((offset + sg_len) > 0x10000)
2805 len = 0x10000 - offset;
2807 ap->prd[idx].addr = cpu_to_le32(addr);
2808 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2809 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2818 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2821 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2822 * @qc: Metadata associated with taskfile to check
2824 * Allow low-level driver to filter ATA PACKET commands, returning
2825 * a status indicating whether or not it is OK to use DMA for the
2826 * supplied PACKET command.
2829 * spin_lock_irqsave(host_set lock)
2831 * RETURNS: 0 when ATAPI DMA can be used
2834 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2836 struct ata_port *ap = qc->ap;
2837 int rc = 0; /* Assume ATAPI DMA is OK by default */
2839 if (ap->ops->check_atapi_dma)
2840 rc = ap->ops->check_atapi_dma(qc);
2845 * ata_qc_prep - Prepare taskfile for submission
2846 * @qc: Metadata associated with taskfile to be prepared
2848 * Prepare ATA taskfile for submission.
2851 * spin_lock_irqsave(host_set lock)
2853 void ata_qc_prep(struct ata_queued_cmd *qc)
2855 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2862 * ata_sg_init_one - Associate command with memory buffer
2863 * @qc: Command to be associated
2864 * @buf: Memory buffer
2865 * @buflen: Length of memory buffer, in bytes.
2867 * Initialize the data-related elements of queued_cmd @qc
2868 * to point to a single memory buffer, @buf of byte length @buflen.
2871 * spin_lock_irqsave(host_set lock)
2874 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2876 struct scatterlist *sg;
2878 qc->flags |= ATA_QCFLAG_SINGLE;
2880 memset(&qc->sgent, 0, sizeof(qc->sgent));
2881 qc->__sg = &qc->sgent;
2883 qc->orig_n_elem = 1;
2887 sg_init_one(sg, buf, buflen);
2891 * ata_sg_init - Associate command with scatter-gather table.
2892 * @qc: Command to be associated
2893 * @sg: Scatter-gather table.
2894 * @n_elem: Number of elements in s/g table.
2896 * Initialize the data-related elements of queued_cmd @qc
2897 * to point to a scatter-gather table @sg, containing @n_elem
2901 * spin_lock_irqsave(host_set lock)
2904 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2905 unsigned int n_elem)
2907 qc->flags |= ATA_QCFLAG_SG;
2909 qc->n_elem = n_elem;
2910 qc->orig_n_elem = n_elem;
2914 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2915 * @qc: Command with memory buffer to be mapped.
2917 * DMA-map the memory buffer associated with queued_cmd @qc.
2920 * spin_lock_irqsave(host_set lock)
2923 * Zero on success, negative on error.
2926 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
2928 struct ata_port *ap = qc->ap;
2929 int dir = qc->dma_dir;
2930 struct scatterlist *sg = qc->__sg;
2931 dma_addr_t dma_address;
2934 /* we must lengthen transfers to end on a 32-bit boundary */
2935 qc->pad_len = sg->length & 3;
2937 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2938 struct scatterlist *psg = &qc->pad_sgent;
2940 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2942 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2944 if (qc->tf.flags & ATA_TFLAG_WRITE)
2945 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
2948 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2949 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2951 sg->length -= qc->pad_len;
2952 if (sg->length == 0)
2955 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2956 sg->length, qc->pad_len);
2964 dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
2966 if (dma_mapping_error(dma_address)) {
2968 sg->length += qc->pad_len;
2972 sg_dma_address(sg) = dma_address;
2973 sg_dma_len(sg) = sg->length;
2976 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
2977 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
2983 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2984 * @qc: Command with scatter-gather table to be mapped.
2986 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2989 * spin_lock_irqsave(host_set lock)
2992 * Zero on success, negative on error.
2996 static int ata_sg_setup(struct ata_queued_cmd *qc)
2998 struct ata_port *ap = qc->ap;
2999 struct scatterlist *sg = qc->__sg;
3000 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3001 int n_elem, pre_n_elem, dir, trim_sg = 0;
3003 VPRINTK("ENTER, ata%u\n", ap->id);
3004 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3006 /* we must lengthen transfers to end on a 32-bit boundary */
3007 qc->pad_len = lsg->length & 3;
3009 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3010 struct scatterlist *psg = &qc->pad_sgent;
3011 unsigned int offset;
3013 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3015 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3018 * psg->page/offset are used to copy to-be-written
3019 * data in this function or read data in ata_sg_clean.
3021 offset = lsg->offset + lsg->length - qc->pad_len;
3022 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3023 psg->offset = offset_in_page(offset);
3025 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3026 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3027 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3028 kunmap_atomic(addr, KM_IRQ0);
3031 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3032 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3034 lsg->length -= qc->pad_len;
3035 if (lsg->length == 0)
3038 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3039 qc->n_elem - 1, lsg->length, qc->pad_len);
3042 pre_n_elem = qc->n_elem;
3043 if (trim_sg && pre_n_elem)
3052 n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
3054 /* restore last sg */
3055 lsg->length += qc->pad_len;
3059 DPRINTK("%d sg elements mapped\n", n_elem);
3062 qc->n_elem = n_elem;
3068 * ata_poll_qc_complete - turn irq back on and finish qc
3069 * @qc: Command to complete
3070 * @err_mask: ATA status register content
3073 * None. (grabs host lock)
3076 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3078 struct ata_port *ap = qc->ap;
3079 unsigned long flags;
3081 spin_lock_irqsave(&ap->host_set->lock, flags);
3082 ap->flags &= ~ATA_FLAG_NOINTR;
3084 ata_qc_complete(qc);
3085 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3089 * ata_pio_poll - poll using PIO, depending on current state
3090 * @ap: the target ata_port
3093 * None. (executing in kernel thread context)
3096 * timeout value to use
3099 static unsigned long ata_pio_poll(struct ata_port *ap)
3101 struct ata_queued_cmd *qc;
3103 unsigned int poll_state = HSM_ST_UNKNOWN;
3104 unsigned int reg_state = HSM_ST_UNKNOWN;
3106 qc = ata_qc_from_tag(ap, ap->active_tag);
3107 WARN_ON(qc == NULL);
3109 switch (ap->hsm_task_state) {
3112 poll_state = HSM_ST_POLL;
3116 case HSM_ST_LAST_POLL:
3117 poll_state = HSM_ST_LAST_POLL;
3118 reg_state = HSM_ST_LAST;
3125 status = ata_chk_status(ap);
3126 if (status & ATA_BUSY) {
3127 if (time_after(jiffies, ap->pio_task_timeout)) {
3128 qc->err_mask |= AC_ERR_TIMEOUT;
3129 ap->hsm_task_state = HSM_ST_TMOUT;
3132 ap->hsm_task_state = poll_state;
3133 return ATA_SHORT_PAUSE;
3136 ap->hsm_task_state = reg_state;
3141 * ata_pio_complete - check if drive is busy or idle
3142 * @ap: the target ata_port
3145 * None. (executing in kernel thread context)
3148 * Non-zero if qc completed, zero otherwise.
3151 static int ata_pio_complete (struct ata_port *ap)
3153 struct ata_queued_cmd *qc;
3157 * This is purely heuristic. This is a fast path. Sometimes when
3158 * we enter, BSY will be cleared in a chk-status or two. If not,
3159 * the drive is probably seeking or something. Snooze for a couple
3160 * msecs, then chk-status again. If still busy, fall back to
3161 * HSM_ST_POLL state.
3163 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3164 if (drv_stat & ATA_BUSY) {
3166 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3167 if (drv_stat & ATA_BUSY) {
3168 ap->hsm_task_state = HSM_ST_LAST_POLL;
3169 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3174 qc = ata_qc_from_tag(ap, ap->active_tag);
3175 WARN_ON(qc == NULL);
3177 drv_stat = ata_wait_idle(ap);
3178 if (!ata_ok(drv_stat)) {
3179 qc->err_mask |= __ac_err_mask(drv_stat);
3180 ap->hsm_task_state = HSM_ST_ERR;
3184 ap->hsm_task_state = HSM_ST_IDLE;
3186 WARN_ON(qc->err_mask);
3187 ata_poll_qc_complete(qc);
3189 /* another command may start at this point */
3196 * swap_buf_le16 - swap halves of 16-bit words in place
3197 * @buf: Buffer to swap
3198 * @buf_words: Number of 16-bit words in buffer.
3200 * Swap halves of 16-bit words if needed to convert from
3201 * little-endian byte order to native cpu byte order, or
3205 * Inherited from caller.
3207 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3212 for (i = 0; i < buf_words; i++)
3213 buf[i] = le16_to_cpu(buf[i]);
3214 #endif /* __BIG_ENDIAN */
3218 * ata_mmio_data_xfer - Transfer data by MMIO
3219 * @ap: port to read/write
3221 * @buflen: buffer length
3222 * @write_data: read/write
3224 * Transfer data from/to the device data register by MMIO.
3227 * Inherited from caller.
3230 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3231 unsigned int buflen, int write_data)
3234 unsigned int words = buflen >> 1;
3235 u16 *buf16 = (u16 *) buf;
3236 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3238 /* Transfer multiple of 2 bytes */
3240 for (i = 0; i < words; i++)
3241 writew(le16_to_cpu(buf16[i]), mmio);
3243 for (i = 0; i < words; i++)
3244 buf16[i] = cpu_to_le16(readw(mmio));
3247 /* Transfer trailing 1 byte, if any. */
3248 if (unlikely(buflen & 0x01)) {
3249 u16 align_buf[1] = { 0 };
3250 unsigned char *trailing_buf = buf + buflen - 1;
3253 memcpy(align_buf, trailing_buf, 1);
3254 writew(le16_to_cpu(align_buf[0]), mmio);
3256 align_buf[0] = cpu_to_le16(readw(mmio));
3257 memcpy(trailing_buf, align_buf, 1);
3263 * ata_pio_data_xfer - Transfer data by PIO
3264 * @ap: port to read/write
3266 * @buflen: buffer length
3267 * @write_data: read/write
3269 * Transfer data from/to the device data register by PIO.
3272 * Inherited from caller.
3275 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3276 unsigned int buflen, int write_data)
3278 unsigned int words = buflen >> 1;
3280 /* Transfer multiple of 2 bytes */
3282 outsw(ap->ioaddr.data_addr, buf, words);
3284 insw(ap->ioaddr.data_addr, buf, words);
3286 /* Transfer trailing 1 byte, if any. */
3287 if (unlikely(buflen & 0x01)) {
3288 u16 align_buf[1] = { 0 };
3289 unsigned char *trailing_buf = buf + buflen - 1;
3292 memcpy(align_buf, trailing_buf, 1);
3293 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3295 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3296 memcpy(trailing_buf, align_buf, 1);
3302 * ata_data_xfer - Transfer data from/to the data register.
3303 * @ap: port to read/write
3305 * @buflen: buffer length
3306 * @do_write: read/write
3308 * Transfer data from/to the device data register.
3311 * Inherited from caller.
3314 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3315 unsigned int buflen, int do_write)
3317 /* Make the crap hardware pay the costs not the good stuff */
3318 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3319 unsigned long flags;
3320 local_irq_save(flags);
3321 if (ap->flags & ATA_FLAG_MMIO)
3322 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3324 ata_pio_data_xfer(ap, buf, buflen, do_write);
3325 local_irq_restore(flags);
3327 if (ap->flags & ATA_FLAG_MMIO)
3328 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3330 ata_pio_data_xfer(ap, buf, buflen, do_write);
3335 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3336 * @qc: Command on going
3338 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3341 * Inherited from caller.
3344 static void ata_pio_sector(struct ata_queued_cmd *qc)
3346 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3347 struct scatterlist *sg = qc->__sg;
3348 struct ata_port *ap = qc->ap;
3350 unsigned int offset;
3353 if (qc->cursect == (qc->nsect - 1))
3354 ap->hsm_task_state = HSM_ST_LAST;
3356 page = sg[qc->cursg].page;
3357 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3359 /* get the current page and offset */
3360 page = nth_page(page, (offset >> PAGE_SHIFT));
3361 offset %= PAGE_SIZE;
3363 buf = kmap(page) + offset;
3368 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3373 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3375 /* do the actual data transfer */
3376 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3377 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3383 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3384 * @qc: Command on going
3385 * @bytes: number of bytes
3387 * Transfer Transfer data from/to the ATAPI device.
3390 * Inherited from caller.
3394 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3396 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3397 struct scatterlist *sg = qc->__sg;
3398 struct ata_port *ap = qc->ap;
3401 unsigned int offset, count;
3403 if (qc->curbytes + bytes >= qc->nbytes)
3404 ap->hsm_task_state = HSM_ST_LAST;
3407 if (unlikely(qc->cursg >= qc->n_elem)) {
3409 * The end of qc->sg is reached and the device expects
3410 * more data to transfer. In order not to overrun qc->sg
3411 * and fulfill length specified in the byte count register,
3412 * - for read case, discard trailing data from the device
3413 * - for write case, padding zero data to the device
3415 u16 pad_buf[1] = { 0 };
3416 unsigned int words = bytes >> 1;
3419 if (words) /* warning if bytes > 1 */
3420 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3423 for (i = 0; i < words; i++)
3424 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3426 ap->hsm_task_state = HSM_ST_LAST;
3430 sg = &qc->__sg[qc->cursg];
3433 offset = sg->offset + qc->cursg_ofs;
3435 /* get the current page and offset */
3436 page = nth_page(page, (offset >> PAGE_SHIFT));
3437 offset %= PAGE_SIZE;
3439 /* don't overrun current sg */
3440 count = min(sg->length - qc->cursg_ofs, bytes);
3442 /* don't cross page boundaries */
3443 count = min(count, (unsigned int)PAGE_SIZE - offset);
3445 buf = kmap(page) + offset;
3448 qc->curbytes += count;
3449 qc->cursg_ofs += count;
3451 if (qc->cursg_ofs == sg->length) {
3456 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3458 /* do the actual data transfer */
3459 ata_data_xfer(ap, buf, count, do_write);
3468 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3469 * @qc: Command on going
3471 * Transfer Transfer data from/to the ATAPI device.
3474 * Inherited from caller.
3477 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3479 struct ata_port *ap = qc->ap;
3480 struct ata_device *dev = qc->dev;
3481 unsigned int ireason, bc_lo, bc_hi, bytes;
3482 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3484 ap->ops->tf_read(ap, &qc->tf);
3485 ireason = qc->tf.nsect;
3486 bc_lo = qc->tf.lbam;
3487 bc_hi = qc->tf.lbah;
3488 bytes = (bc_hi << 8) | bc_lo;
3490 /* shall be cleared to zero, indicating xfer of data */
3491 if (ireason & (1 << 0))
3494 /* make sure transfer direction matches expected */
3495 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3496 if (do_write != i_write)
3499 __atapi_pio_bytes(qc, bytes);
3504 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3505 ap->id, dev->devno);
3506 qc->err_mask |= AC_ERR_HSM;
3507 ap->hsm_task_state = HSM_ST_ERR;
3511 * ata_pio_block - start PIO on a block
3512 * @ap: the target ata_port
3515 * None. (executing in kernel thread context)
3518 static void ata_pio_block(struct ata_port *ap)
3520 struct ata_queued_cmd *qc;
3524 * This is purely heuristic. This is a fast path.
3525 * Sometimes when we enter, BSY will be cleared in
3526 * a chk-status or two. If not, the drive is probably seeking
3527 * or something. Snooze for a couple msecs, then
3528 * chk-status again. If still busy, fall back to
3529 * HSM_ST_POLL state.
3531 status = ata_busy_wait(ap, ATA_BUSY, 5);
3532 if (status & ATA_BUSY) {
3534 status = ata_busy_wait(ap, ATA_BUSY, 10);
3535 if (status & ATA_BUSY) {
3536 ap->hsm_task_state = HSM_ST_POLL;
3537 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3542 qc = ata_qc_from_tag(ap, ap->active_tag);
3543 WARN_ON(qc == NULL);
3546 if (status & (ATA_ERR | ATA_DF)) {
3547 qc->err_mask |= AC_ERR_DEV;
3548 ap->hsm_task_state = HSM_ST_ERR;
3552 /* transfer data if any */
3553 if (is_atapi_taskfile(&qc->tf)) {
3554 /* DRQ=0 means no more data to transfer */
3555 if ((status & ATA_DRQ) == 0) {
3556 ap->hsm_task_state = HSM_ST_LAST;
3560 atapi_pio_bytes(qc);
3562 /* handle BSY=0, DRQ=0 as error */
3563 if ((status & ATA_DRQ) == 0) {
3564 qc->err_mask |= AC_ERR_HSM;
3565 ap->hsm_task_state = HSM_ST_ERR;
3573 static void ata_pio_error(struct ata_port *ap)
3575 struct ata_queued_cmd *qc;
3577 qc = ata_qc_from_tag(ap, ap->active_tag);
3578 WARN_ON(qc == NULL);
3580 if (qc->tf.command != ATA_CMD_PACKET)
3581 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3583 /* make sure qc->err_mask is available to
3584 * know what's wrong and recover
3586 WARN_ON(qc->err_mask == 0);
3588 ap->hsm_task_state = HSM_ST_IDLE;
3590 ata_poll_qc_complete(qc);
3593 static void ata_pio_task(void *_data)
3595 struct ata_port *ap = _data;
3596 unsigned long timeout;
3603 switch (ap->hsm_task_state) {
3612 qc_completed = ata_pio_complete(ap);
3616 case HSM_ST_LAST_POLL:
3617 timeout = ata_pio_poll(ap);
3627 ata_port_queue_task(ap, ata_pio_task, ap, timeout);
3628 else if (!qc_completed)
3633 * atapi_packet_task - Write CDB bytes to hardware
3634 * @_data: Port to which ATAPI device is attached.
3636 * When device has indicated its readiness to accept
3637 * a CDB, this function is called. Send the CDB.
3638 * If DMA is to be performed, exit immediately.
3639 * Otherwise, we are in polling mode, so poll
3640 * status under operation succeeds or fails.
3643 * Kernel thread context (may sleep)
3646 static void atapi_packet_task(void *_data)
3648 struct ata_port *ap = _data;
3649 struct ata_queued_cmd *qc;
3652 qc = ata_qc_from_tag(ap, ap->active_tag);
3653 WARN_ON(qc == NULL);
3654 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3656 /* sleep-wait for BSY to clear */
3657 DPRINTK("busy wait\n");
3658 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3659 qc->err_mask |= AC_ERR_TIMEOUT;
3663 /* make sure DRQ is set */
3664 status = ata_chk_status(ap);
3665 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3666 qc->err_mask |= AC_ERR_HSM;
3671 DPRINTK("send cdb\n");
3672 WARN_ON(qc->dev->cdb_len < 12);
3674 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3675 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3676 unsigned long flags;
3678 /* Once we're done issuing command and kicking bmdma,
3679 * irq handler takes over. To not lose irq, we need
3680 * to clear NOINTR flag before sending cdb, but
3681 * interrupt handler shouldn't be invoked before we're
3682 * finished. Hence, the following locking.
3684 spin_lock_irqsave(&ap->host_set->lock, flags);
3685 ap->flags &= ~ATA_FLAG_NOINTR;
3686 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3687 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3688 ap->ops->bmdma_start(qc); /* initiate bmdma */
3689 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3691 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3693 /* PIO commands are handled by polling */
3694 ap->hsm_task_state = HSM_ST;
3695 ata_port_queue_task(ap, ata_pio_task, ap, 0);
3701 ata_poll_qc_complete(qc);
3705 * ata_qc_timeout - Handle timeout of queued command
3706 * @qc: Command that timed out
3708 * Some part of the kernel (currently, only the SCSI layer)
3709 * has noticed that the active command on port @ap has not
3710 * completed after a specified length of time. Handle this
3711 * condition by disabling DMA (if necessary) and completing
3712 * transactions, with error if necessary.
3714 * This also handles the case of the "lost interrupt", where
3715 * for some reason (possibly hardware bug, possibly driver bug)
3716 * an interrupt was not delivered to the driver, even though the
3717 * transaction completed successfully.
3720 * Inherited from SCSI layer (none, can sleep)
3723 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3725 struct ata_port *ap = qc->ap;
3726 struct ata_host_set *host_set = ap->host_set;
3727 u8 host_stat = 0, drv_stat;
3728 unsigned long flags;
3732 ap->hsm_task_state = HSM_ST_IDLE;
3734 spin_lock_irqsave(&host_set->lock, flags);
3736 switch (qc->tf.protocol) {
3739 case ATA_PROT_ATAPI_DMA:
3740 host_stat = ap->ops->bmdma_status(ap);
3742 /* before we do anything else, clear DMA-Start bit */
3743 ap->ops->bmdma_stop(qc);
3749 drv_stat = ata_chk_status(ap);
3751 /* ack bmdma irq events */
3752 ap->ops->irq_clear(ap);
3754 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3755 ap->id, qc->tf.command, drv_stat, host_stat);
3757 /* complete taskfile transaction */
3758 qc->err_mask |= ac_err_mask(drv_stat);
3762 spin_unlock_irqrestore(&host_set->lock, flags);
3764 ata_eh_qc_complete(qc);
3770 * ata_eng_timeout - Handle timeout of queued command
3771 * @ap: Port on which timed-out command is active
3773 * Some part of the kernel (currently, only the SCSI layer)
3774 * has noticed that the active command on port @ap has not
3775 * completed after a specified length of time. Handle this
3776 * condition by disabling DMA (if necessary) and completing
3777 * transactions, with error if necessary.
3779 * This also handles the case of the "lost interrupt", where
3780 * for some reason (possibly hardware bug, possibly driver bug)
3781 * an interrupt was not delivered to the driver, even though the
3782 * transaction completed successfully.
3785 * Inherited from SCSI layer (none, can sleep)
3788 void ata_eng_timeout(struct ata_port *ap)
3792 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3798 * ata_qc_new - Request an available ATA command, for queueing
3799 * @ap: Port associated with device @dev
3800 * @dev: Device from whom we request an available command structure
3806 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3808 struct ata_queued_cmd *qc = NULL;
3811 for (i = 0; i < ATA_MAX_QUEUE; i++)
3812 if (!test_and_set_bit(i, &ap->qactive)) {
3813 qc = ata_qc_from_tag(ap, i);
3824 * ata_qc_new_init - Request an available ATA command, and initialize it
3825 * @ap: Port associated with device @dev
3826 * @dev: Device from whom we request an available command structure
3832 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3833 struct ata_device *dev)
3835 struct ata_queued_cmd *qc;
3837 qc = ata_qc_new(ap);
3850 * ata_qc_free - free unused ata_queued_cmd
3851 * @qc: Command to complete
3853 * Designed to free unused ata_queued_cmd object
3854 * in case something prevents using it.
3857 * spin_lock_irqsave(host_set lock)
3859 void ata_qc_free(struct ata_queued_cmd *qc)
3861 struct ata_port *ap = qc->ap;
3864 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3868 if (likely(ata_tag_valid(tag))) {
3869 if (tag == ap->active_tag)
3870 ap->active_tag = ATA_TAG_POISON;
3871 qc->tag = ATA_TAG_POISON;
3872 clear_bit(tag, &ap->qactive);
3876 void __ata_qc_complete(struct ata_queued_cmd *qc)
3878 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3879 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3881 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3884 /* atapi: mark qc as inactive to prevent the interrupt handler
3885 * from completing the command twice later, before the error handler
3886 * is called. (when rc != 0 and atapi request sense is needed)
3888 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3890 /* call completion callback */
3891 qc->complete_fn(qc);
3894 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3896 struct ata_port *ap = qc->ap;
3898 switch (qc->tf.protocol) {
3900 case ATA_PROT_ATAPI_DMA:
3903 case ATA_PROT_ATAPI:
3905 case ATA_PROT_PIO_MULT:
3906 if (ap->flags & ATA_FLAG_PIO_DMA)
3919 * ata_qc_issue - issue taskfile to device
3920 * @qc: command to issue to device
3922 * Prepare an ATA command to submission to device.
3923 * This includes mapping the data into a DMA-able
3924 * area, filling in the S/G table, and finally
3925 * writing the taskfile to hardware, starting the command.
3928 * spin_lock_irqsave(host_set lock)
3931 * Zero on success, AC_ERR_* mask on failure
3934 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
3936 struct ata_port *ap = qc->ap;
3938 if (ata_should_dma_map(qc)) {
3939 if (qc->flags & ATA_QCFLAG_SG) {
3940 if (ata_sg_setup(qc))
3942 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
3943 if (ata_sg_setup_one(qc))
3947 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3950 ap->ops->qc_prep(qc);
3952 qc->ap->active_tag = qc->tag;
3953 qc->flags |= ATA_QCFLAG_ACTIVE;
3955 return ap->ops->qc_issue(qc);
3958 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3959 return AC_ERR_SYSTEM;
3964 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3965 * @qc: command to issue to device
3967 * Using various libata functions and hooks, this function
3968 * starts an ATA command. ATA commands are grouped into
3969 * classes called "protocols", and issuing each type of protocol
3970 * is slightly different.
3972 * May be used as the qc_issue() entry in ata_port_operations.
3975 * spin_lock_irqsave(host_set lock)
3978 * Zero on success, AC_ERR_* mask on failure
3981 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
3983 struct ata_port *ap = qc->ap;
3985 ata_dev_select(ap, qc->dev->devno, 1, 0);
3987 switch (qc->tf.protocol) {
3988 case ATA_PROT_NODATA:
3989 ata_tf_to_host(ap, &qc->tf);
3993 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
3994 ap->ops->bmdma_setup(qc); /* set up bmdma */
3995 ap->ops->bmdma_start(qc); /* initiate bmdma */
3998 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
3999 ata_qc_set_polling(qc);
4000 ata_tf_to_host(ap, &qc->tf);
4001 ap->hsm_task_state = HSM_ST;
4002 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4005 case ATA_PROT_ATAPI:
4006 ata_qc_set_polling(qc);
4007 ata_tf_to_host(ap, &qc->tf);
4008 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4011 case ATA_PROT_ATAPI_NODATA:
4012 ap->flags |= ATA_FLAG_NOINTR;
4013 ata_tf_to_host(ap, &qc->tf);
4014 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4017 case ATA_PROT_ATAPI_DMA:
4018 ap->flags |= ATA_FLAG_NOINTR;
4019 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4020 ap->ops->bmdma_setup(qc); /* set up bmdma */
4021 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4026 return AC_ERR_SYSTEM;
4033 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
4034 * @qc: Info associated with this ATA transaction.
4037 * spin_lock_irqsave(host_set lock)
4040 static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
4042 struct ata_port *ap = qc->ap;
4043 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
4045 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4047 /* load PRD table addr. */
4048 mb(); /* make sure PRD table writes are visible to controller */
4049 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
4051 /* specify data direction, triple-check start bit is clear */
4052 dmactl = readb(mmio + ATA_DMA_CMD);
4053 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
4055 dmactl |= ATA_DMA_WR;
4056 writeb(dmactl, mmio + ATA_DMA_CMD);
4058 /* issue r/w command */
4059 ap->ops->exec_command(ap, &qc->tf);
4063 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
4064 * @qc: Info associated with this ATA transaction.
4067 * spin_lock_irqsave(host_set lock)
4070 static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
4072 struct ata_port *ap = qc->ap;
4073 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4076 /* start host DMA transaction */
4077 dmactl = readb(mmio + ATA_DMA_CMD);
4078 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
4080 /* Strictly, one may wish to issue a readb() here, to
4081 * flush the mmio write. However, control also passes
4082 * to the hardware at this point, and it will interrupt
4083 * us when we are to resume control. So, in effect,
4084 * we don't care when the mmio write flushes.
4085 * Further, a read of the DMA status register _immediately_
4086 * following the write may not be what certain flaky hardware
4087 * is expected, so I think it is best to not add a readb()
4088 * without first all the MMIO ATA cards/mobos.
4089 * Or maybe I'm just being paranoid.
4094 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
4095 * @qc: Info associated with this ATA transaction.
4098 * spin_lock_irqsave(host_set lock)
4101 static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
4103 struct ata_port *ap = qc->ap;
4104 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
4107 /* load PRD table addr. */
4108 outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
4110 /* specify data direction, triple-check start bit is clear */
4111 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4112 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
4114 dmactl |= ATA_DMA_WR;
4115 outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4117 /* issue r/w command */
4118 ap->ops->exec_command(ap, &qc->tf);
4122 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
4123 * @qc: Info associated with this ATA transaction.
4126 * spin_lock_irqsave(host_set lock)
4129 static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
4131 struct ata_port *ap = qc->ap;
4134 /* start host DMA transaction */
4135 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4136 outb(dmactl | ATA_DMA_START,
4137 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4142 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
4143 * @qc: Info associated with this ATA transaction.
4145 * Writes the ATA_DMA_START flag to the DMA command register.
4147 * May be used as the bmdma_start() entry in ata_port_operations.
4150 * spin_lock_irqsave(host_set lock)
4152 void ata_bmdma_start(struct ata_queued_cmd *qc)
4154 if (qc->ap->flags & ATA_FLAG_MMIO)
4155 ata_bmdma_start_mmio(qc);
4157 ata_bmdma_start_pio(qc);
4162 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
4163 * @qc: Info associated with this ATA transaction.
4165 * Writes address of PRD table to device's PRD Table Address
4166 * register, sets the DMA control register, and calls
4167 * ops->exec_command() to start the transfer.
4169 * May be used as the bmdma_setup() entry in ata_port_operations.
4172 * spin_lock_irqsave(host_set lock)
4174 void ata_bmdma_setup(struct ata_queued_cmd *qc)
4176 if (qc->ap->flags & ATA_FLAG_MMIO)
4177 ata_bmdma_setup_mmio(qc);
4179 ata_bmdma_setup_pio(qc);
4184 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
4185 * @ap: Port associated with this ATA transaction.
4187 * Clear interrupt and error flags in DMA status register.
4189 * May be used as the irq_clear() entry in ata_port_operations.
4192 * spin_lock_irqsave(host_set lock)
4195 void ata_bmdma_irq_clear(struct ata_port *ap)
4197 if (ap->flags & ATA_FLAG_MMIO) {
4198 void __iomem *mmio = ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
4199 writeb(readb(mmio), mmio);
4201 unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
4202 outb(inb(addr), addr);
4209 * ata_bmdma_status - Read PCI IDE BMDMA status
4210 * @ap: Port associated with this ATA transaction.
4212 * Read and return BMDMA status register.
4214 * May be used as the bmdma_status() entry in ata_port_operations.
4217 * spin_lock_irqsave(host_set lock)
4220 u8 ata_bmdma_status(struct ata_port *ap)
4223 if (ap->flags & ATA_FLAG_MMIO) {
4224 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4225 host_stat = readb(mmio + ATA_DMA_STATUS);
4227 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
4233 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4234 * @qc: Command we are ending DMA for
4236 * Clears the ATA_DMA_START flag in the dma control register
4238 * May be used as the bmdma_stop() entry in ata_port_operations.
4241 * spin_lock_irqsave(host_set lock)
4244 void ata_bmdma_stop(struct ata_queued_cmd *qc)
4246 struct ata_port *ap = qc->ap;
4247 if (ap->flags & ATA_FLAG_MMIO) {
4248 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4250 /* clear start/stop bit */
4251 writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
4252 mmio + ATA_DMA_CMD);
4254 /* clear start/stop bit */
4255 outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
4256 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4259 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4260 ata_altstatus(ap); /* dummy read */
4264 * ata_host_intr - Handle host interrupt for given (port, task)
4265 * @ap: Port on which interrupt arrived (possibly...)
4266 * @qc: Taskfile currently active in engine
4268 * Handle host interrupt for given queued command. Currently,
4269 * only DMA interrupts are handled. All other commands are
4270 * handled via polling with interrupts disabled (nIEN bit).
4273 * spin_lock_irqsave(host_set lock)
4276 * One if interrupt was handled, zero if not (shared irq).
4279 inline unsigned int ata_host_intr (struct ata_port *ap,
4280 struct ata_queued_cmd *qc)
4282 u8 status, host_stat;
4284 switch (qc->tf.protocol) {
4287 case ATA_PROT_ATAPI_DMA:
4288 case ATA_PROT_ATAPI:
4289 /* check status of DMA engine */
4290 host_stat = ap->ops->bmdma_status(ap);
4291 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4293 /* if it's not our irq... */
4294 if (!(host_stat & ATA_DMA_INTR))
4297 /* before we do anything else, clear DMA-Start bit */
4298 ap->ops->bmdma_stop(qc);
4302 case ATA_PROT_ATAPI_NODATA:
4303 case ATA_PROT_NODATA:
4304 /* check altstatus */
4305 status = ata_altstatus(ap);
4306 if (status & ATA_BUSY)
4309 /* check main status, clearing INTRQ */
4310 status = ata_chk_status(ap);
4311 if (unlikely(status & ATA_BUSY))
4313 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4314 ap->id, qc->tf.protocol, status);
4316 /* ack bmdma irq events */
4317 ap->ops->irq_clear(ap);
4319 /* complete taskfile transaction */
4320 qc->err_mask |= ac_err_mask(status);
4321 ata_qc_complete(qc);
4328 return 1; /* irq handled */
4331 ap->stats.idle_irq++;
4334 if ((ap->stats.idle_irq % 1000) == 0) {
4336 ata_irq_ack(ap, 0); /* debug trap */
4337 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4340 return 0; /* irq not handled */
4344 * ata_interrupt - Default ATA host interrupt handler
4345 * @irq: irq line (unused)
4346 * @dev_instance: pointer to our ata_host_set information structure
4349 * Default interrupt handler for PCI IDE devices. Calls
4350 * ata_host_intr() for each port that is not disabled.
4353 * Obtains host_set lock during operation.
4356 * IRQ_NONE or IRQ_HANDLED.
4359 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4361 struct ata_host_set *host_set = dev_instance;
4363 unsigned int handled = 0;
4364 unsigned long flags;
4366 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4367 spin_lock_irqsave(&host_set->lock, flags);
4369 for (i = 0; i < host_set->n_ports; i++) {
4370 struct ata_port *ap;
4372 ap = host_set->ports[i];
4374 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4375 struct ata_queued_cmd *qc;
4377 qc = ata_qc_from_tag(ap, ap->active_tag);
4378 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4379 (qc->flags & ATA_QCFLAG_ACTIVE))
4380 handled |= ata_host_intr(ap, qc);
4384 spin_unlock_irqrestore(&host_set->lock, flags);
4386 return IRQ_RETVAL(handled);
4391 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4392 * without filling any other registers
4394 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4397 struct ata_taskfile tf;
4400 ata_tf_init(ap, &tf, dev->devno);
4403 tf.flags |= ATA_TFLAG_DEVICE;
4404 tf.protocol = ATA_PROT_NODATA;
4406 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4408 printk(KERN_ERR "%s: ata command failed: %d\n",
4414 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4418 if (!ata_try_flush_cache(dev))
4421 if (ata_id_has_flush_ext(dev->id))
4422 cmd = ATA_CMD_FLUSH_EXT;
4424 cmd = ATA_CMD_FLUSH;
4426 return ata_do_simple_cmd(ap, dev, cmd);
4429 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4431 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4434 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4436 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4440 * ata_device_resume - wakeup a previously suspended devices
4441 * @ap: port the device is connected to
4442 * @dev: the device to resume
4444 * Kick the drive back into action, by sending it an idle immediate
4445 * command and making sure its transfer mode matches between drive
4449 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4451 if (ap->flags & ATA_FLAG_SUSPENDED) {
4452 ap->flags &= ~ATA_FLAG_SUSPENDED;
4455 if (!ata_dev_present(dev))
4457 if (dev->class == ATA_DEV_ATA)
4458 ata_start_drive(ap, dev);
4464 * ata_device_suspend - prepare a device for suspend
4465 * @ap: port the device is connected to
4466 * @dev: the device to suspend
4468 * Flush the cache on the drive, if appropriate, then issue a
4469 * standbynow command.
4471 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
4473 if (!ata_dev_present(dev))
4475 if (dev->class == ATA_DEV_ATA)
4476 ata_flush_cache(ap, dev);
4478 ata_standby_drive(ap, dev);
4479 ap->flags |= ATA_FLAG_SUSPENDED;
4484 * ata_port_start - Set port up for dma.
4485 * @ap: Port to initialize
4487 * Called just after data structures for each port are
4488 * initialized. Allocates space for PRD table.
4490 * May be used as the port_start() entry in ata_port_operations.
4493 * Inherited from caller.
4496 int ata_port_start (struct ata_port *ap)
4498 struct device *dev = ap->host_set->dev;
4501 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4505 rc = ata_pad_alloc(ap, dev);
4507 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4511 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4518 * ata_port_stop - Undo ata_port_start()
4519 * @ap: Port to shut down
4521 * Frees the PRD table.
4523 * May be used as the port_stop() entry in ata_port_operations.
4526 * Inherited from caller.
4529 void ata_port_stop (struct ata_port *ap)
4531 struct device *dev = ap->host_set->dev;
4533 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4534 ata_pad_free(ap, dev);
4537 void ata_host_stop (struct ata_host_set *host_set)
4539 if (host_set->mmio_base)
4540 iounmap(host_set->mmio_base);
4545 * ata_host_remove - Unregister SCSI host structure with upper layers
4546 * @ap: Port to unregister
4547 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4550 * Inherited from caller.
4553 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4555 struct Scsi_Host *sh = ap->host;
4560 scsi_remove_host(sh);
4562 ap->ops->port_stop(ap);
4566 * ata_host_init - Initialize an ata_port structure
4567 * @ap: Structure to initialize
4568 * @host: associated SCSI mid-layer structure
4569 * @host_set: Collection of hosts to which @ap belongs
4570 * @ent: Probe information provided by low-level driver
4571 * @port_no: Port number associated with this ata_port
4573 * Initialize a new ata_port structure, and its associated
4577 * Inherited from caller.
4580 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4581 struct ata_host_set *host_set,
4582 const struct ata_probe_ent *ent, unsigned int port_no)
4588 host->max_channel = 1;
4589 host->unique_id = ata_unique_id++;
4590 host->max_cmd_len = 12;
4592 ap->flags = ATA_FLAG_PORT_DISABLED;
4593 ap->id = host->unique_id;
4595 ap->ctl = ATA_DEVCTL_OBS;
4596 ap->host_set = host_set;
4597 ap->port_no = port_no;
4599 ent->legacy_mode ? ent->hard_port_no : port_no;
4600 ap->pio_mask = ent->pio_mask;
4601 ap->mwdma_mask = ent->mwdma_mask;
4602 ap->udma_mask = ent->udma_mask;
4603 ap->flags |= ent->host_flags;
4604 ap->ops = ent->port_ops;
4605 ap->cbl = ATA_CBL_NONE;
4606 ap->active_tag = ATA_TAG_POISON;
4607 ap->last_ctl = 0xFF;
4609 INIT_WORK(&ap->port_task, NULL, NULL);
4610 INIT_LIST_HEAD(&ap->eh_done_q);
4612 for (i = 0; i < ATA_MAX_DEVICES; i++)
4613 ap->device[i].devno = i;
4616 ap->stats.unhandled_irq = 1;
4617 ap->stats.idle_irq = 1;
4620 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4624 * ata_host_add - Attach low-level ATA driver to system
4625 * @ent: Information provided by low-level driver
4626 * @host_set: Collections of ports to which we add
4627 * @port_no: Port number associated with this host
4629 * Attach low-level ATA driver to system.
4632 * PCI/etc. bus probe sem.
4635 * New ata_port on success, for NULL on error.
4638 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4639 struct ata_host_set *host_set,
4640 unsigned int port_no)
4642 struct Scsi_Host *host;
4643 struct ata_port *ap;
4647 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4651 ap = (struct ata_port *) &host->hostdata[0];
4653 ata_host_init(ap, host, host_set, ent, port_no);
4655 rc = ap->ops->port_start(ap);
4662 scsi_host_put(host);
4667 * ata_device_add - Register hardware device with ATA and SCSI layers
4668 * @ent: Probe information describing hardware device to be registered
4670 * This function processes the information provided in the probe
4671 * information struct @ent, allocates the necessary ATA and SCSI
4672 * host information structures, initializes them, and registers
4673 * everything with requisite kernel subsystems.
4675 * This function requests irqs, probes the ATA bus, and probes
4679 * PCI/etc. bus probe sem.
4682 * Number of ports registered. Zero on error (no ports registered).
4685 int ata_device_add(const struct ata_probe_ent *ent)
4687 unsigned int count = 0, i;
4688 struct device *dev = ent->dev;
4689 struct ata_host_set *host_set;
4692 /* alloc a container for our list of ATA ports (buses) */
4693 host_set = kzalloc(sizeof(struct ata_host_set) +
4694 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4697 spin_lock_init(&host_set->lock);
4699 host_set->dev = dev;
4700 host_set->n_ports = ent->n_ports;
4701 host_set->irq = ent->irq;
4702 host_set->mmio_base = ent->mmio_base;
4703 host_set->private_data = ent->private_data;
4704 host_set->ops = ent->port_ops;
4706 /* register each port bound to this device */
4707 for (i = 0; i < ent->n_ports; i++) {
4708 struct ata_port *ap;
4709 unsigned long xfer_mode_mask;
4711 ap = ata_host_add(ent, host_set, i);
4715 host_set->ports[i] = ap;
4716 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4717 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4718 (ap->pio_mask << ATA_SHIFT_PIO);
4720 /* print per-port info to dmesg */
4721 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4722 "bmdma 0x%lX irq %lu\n",
4724 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4725 ata_mode_string(xfer_mode_mask),
4726 ap->ioaddr.cmd_addr,
4727 ap->ioaddr.ctl_addr,
4728 ap->ioaddr.bmdma_addr,
4732 host_set->ops->irq_clear(ap);
4739 /* obtain irq, that is shared between channels */
4740 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4741 DRV_NAME, host_set))
4744 /* perform each probe synchronously */
4745 DPRINTK("probe begin\n");
4746 for (i = 0; i < count; i++) {
4747 struct ata_port *ap;
4750 ap = host_set->ports[i];
4752 DPRINTK("ata%u: bus probe begin\n", ap->id);
4753 rc = ata_bus_probe(ap);
4754 DPRINTK("ata%u: bus probe end\n", ap->id);
4757 /* FIXME: do something useful here?
4758 * Current libata behavior will
4759 * tear down everything when
4760 * the module is removed
4761 * or the h/w is unplugged.
4765 rc = scsi_add_host(ap->host, dev);
4767 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4769 /* FIXME: do something useful here */
4770 /* FIXME: handle unconditional calls to
4771 * scsi_scan_host and ata_host_remove, below,
4777 /* probes are done, now scan each port's disk(s) */
4778 DPRINTK("host probe begin\n");
4779 for (i = 0; i < count; i++) {
4780 struct ata_port *ap = host_set->ports[i];
4782 ata_scsi_scan_host(ap);
4785 dev_set_drvdata(dev, host_set);
4787 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4788 return ent->n_ports; /* success */
4791 for (i = 0; i < count; i++) {
4792 ata_host_remove(host_set->ports[i], 1);
4793 scsi_host_put(host_set->ports[i]->host);
4797 VPRINTK("EXIT, returning 0\n");
4802 * ata_host_set_remove - PCI layer callback for device removal
4803 * @host_set: ATA host set that was removed
4805 * Unregister all objects associated with this host set. Free those
4809 * Inherited from calling layer (may sleep).
4812 void ata_host_set_remove(struct ata_host_set *host_set)
4814 struct ata_port *ap;
4817 for (i = 0; i < host_set->n_ports; i++) {
4818 ap = host_set->ports[i];
4819 scsi_remove_host(ap->host);
4822 free_irq(host_set->irq, host_set);
4824 for (i = 0; i < host_set->n_ports; i++) {
4825 ap = host_set->ports[i];
4827 ata_scsi_release(ap->host);
4829 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4830 struct ata_ioports *ioaddr = &ap->ioaddr;
4832 if (ioaddr->cmd_addr == 0x1f0)
4833 release_region(0x1f0, 8);
4834 else if (ioaddr->cmd_addr == 0x170)
4835 release_region(0x170, 8);
4838 scsi_host_put(ap->host);
4841 if (host_set->ops->host_stop)
4842 host_set->ops->host_stop(host_set);
4848 * ata_scsi_release - SCSI layer callback hook for host unload
4849 * @host: libata host to be unloaded
4851 * Performs all duties necessary to shut down a libata port...
4852 * Kill port kthread, disable port, and release resources.
4855 * Inherited from SCSI layer.
4861 int ata_scsi_release(struct Scsi_Host *host)
4863 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4868 ap->ops->port_disable(ap);
4869 ata_host_remove(ap, 0);
4870 for (i = 0; i < ATA_MAX_DEVICES; i++)
4871 kfree(ap->device[i].id);
4878 * ata_std_ports - initialize ioaddr with standard port offsets.
4879 * @ioaddr: IO address structure to be initialized
4881 * Utility function which initializes data_addr, error_addr,
4882 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4883 * device_addr, status_addr, and command_addr to standard offsets
4884 * relative to cmd_addr.
4886 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4889 void ata_std_ports(struct ata_ioports *ioaddr)
4891 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4892 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4893 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4894 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4895 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4896 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4897 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4898 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4899 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4900 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4906 void ata_pci_host_stop (struct ata_host_set *host_set)
4908 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4910 pci_iounmap(pdev, host_set->mmio_base);
4914 * ata_pci_remove_one - PCI layer callback for device removal
4915 * @pdev: PCI device that was removed
4917 * PCI layer indicates to libata via this hook that
4918 * hot-unplug or module unload event has occurred.
4919 * Handle this by unregistering all objects associated
4920 * with this PCI device. Free those objects. Then finally
4921 * release PCI resources and disable device.
4924 * Inherited from PCI layer (may sleep).
4927 void ata_pci_remove_one (struct pci_dev *pdev)
4929 struct device *dev = pci_dev_to_dev(pdev);
4930 struct ata_host_set *host_set = dev_get_drvdata(dev);
4932 ata_host_set_remove(host_set);
4933 pci_release_regions(pdev);
4934 pci_disable_device(pdev);
4935 dev_set_drvdata(dev, NULL);
4938 /* move to PCI subsystem */
4939 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4941 unsigned long tmp = 0;
4943 switch (bits->width) {
4946 pci_read_config_byte(pdev, bits->reg, &tmp8);
4952 pci_read_config_word(pdev, bits->reg, &tmp16);
4958 pci_read_config_dword(pdev, bits->reg, &tmp32);
4969 return (tmp == bits->val) ? 1 : 0;
4972 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4974 pci_save_state(pdev);
4975 pci_disable_device(pdev);
4976 pci_set_power_state(pdev, PCI_D3hot);
4980 int ata_pci_device_resume(struct pci_dev *pdev)
4982 pci_set_power_state(pdev, PCI_D0);
4983 pci_restore_state(pdev);
4984 pci_enable_device(pdev);
4985 pci_set_master(pdev);
4988 #endif /* CONFIG_PCI */
4991 static int __init ata_init(void)
4993 ata_wq = create_workqueue("ata");
4997 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5001 static void __exit ata_exit(void)
5003 destroy_workqueue(ata_wq);
5006 module_init(ata_init);
5007 module_exit(ata_exit);
5009 static unsigned long ratelimit_time;
5010 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5012 int ata_ratelimit(void)
5015 unsigned long flags;
5017 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5019 if (time_after(jiffies, ratelimit_time)) {
5021 ratelimit_time = jiffies + (HZ/5);
5025 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5031 * libata is essentially a library of internal helper functions for
5032 * low-level ATA host controller drivers. As such, the API/ABI is
5033 * likely to change as new drivers are added and updated.
5034 * Do not depend on ABI/API stability.
5037 EXPORT_SYMBOL_GPL(ata_std_bios_param);
5038 EXPORT_SYMBOL_GPL(ata_std_ports);
5039 EXPORT_SYMBOL_GPL(ata_device_add);
5040 EXPORT_SYMBOL_GPL(ata_host_set_remove);
5041 EXPORT_SYMBOL_GPL(ata_sg_init);
5042 EXPORT_SYMBOL_GPL(ata_sg_init_one);
5043 EXPORT_SYMBOL_GPL(__ata_qc_complete);
5044 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
5045 EXPORT_SYMBOL_GPL(ata_eng_timeout);
5046 EXPORT_SYMBOL_GPL(ata_tf_load);
5047 EXPORT_SYMBOL_GPL(ata_tf_read);
5048 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5049 EXPORT_SYMBOL_GPL(ata_std_dev_select);
5050 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5051 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5052 EXPORT_SYMBOL_GPL(ata_check_status);
5053 EXPORT_SYMBOL_GPL(ata_altstatus);
5054 EXPORT_SYMBOL_GPL(ata_exec_command);
5055 EXPORT_SYMBOL_GPL(ata_port_start);
5056 EXPORT_SYMBOL_GPL(ata_port_stop);
5057 EXPORT_SYMBOL_GPL(ata_host_stop);
5058 EXPORT_SYMBOL_GPL(ata_interrupt);
5059 EXPORT_SYMBOL_GPL(ata_qc_prep);
5060 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5061 EXPORT_SYMBOL_GPL(ata_bmdma_start);
5062 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5063 EXPORT_SYMBOL_GPL(ata_bmdma_status);
5064 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5065 EXPORT_SYMBOL_GPL(ata_port_probe);
5066 EXPORT_SYMBOL_GPL(sata_phy_reset);
5067 EXPORT_SYMBOL_GPL(__sata_phy_reset);
5068 EXPORT_SYMBOL_GPL(ata_bus_reset);
5069 EXPORT_SYMBOL_GPL(ata_std_probeinit);
5070 EXPORT_SYMBOL_GPL(ata_std_softreset);
5071 EXPORT_SYMBOL_GPL(sata_std_hardreset);
5072 EXPORT_SYMBOL_GPL(ata_std_postreset);
5073 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5074 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5075 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
5076 EXPORT_SYMBOL_GPL(ata_port_disable);
5077 EXPORT_SYMBOL_GPL(ata_ratelimit);
5078 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5079 EXPORT_SYMBOL_GPL(ata_port_queue_task);
5080 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5081 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5082 EXPORT_SYMBOL_GPL(ata_scsi_timed_out);
5083 EXPORT_SYMBOL_GPL(ata_scsi_error);
5084 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5085 EXPORT_SYMBOL_GPL(ata_scsi_release);
5086 EXPORT_SYMBOL_GPL(ata_host_intr);
5087 EXPORT_SYMBOL_GPL(ata_dev_classify);
5088 EXPORT_SYMBOL_GPL(ata_id_string);
5089 EXPORT_SYMBOL_GPL(ata_id_c_string);
5090 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5091 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5092 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
5094 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5095 EXPORT_SYMBOL_GPL(ata_timing_compute);
5096 EXPORT_SYMBOL_GPL(ata_timing_merge);
5099 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5100 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5101 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5102 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5103 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5104 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5105 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5106 #endif /* CONFIG_PCI */
5108 EXPORT_SYMBOL_GPL(ata_device_suspend);
5109 EXPORT_SYMBOL_GPL(ata_device_resume);
5110 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5111 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);