2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_port *ap,
65 struct ata_device *dev);
66 static void ata_set_mode(struct ata_port *ap);
67 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
68 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev);
70 static unsigned int ata_unique_id = 1;
71 static struct workqueue_struct *ata_wq;
73 int atapi_enabled = 1;
74 module_param(atapi_enabled, int, 0444);
75 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
78 module_param_named(fua, libata_fua, int, 0444);
79 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
81 MODULE_AUTHOR("Jeff Garzik");
82 MODULE_DESCRIPTION("Library module for ATA devices");
83 MODULE_LICENSE("GPL");
84 MODULE_VERSION(DRV_VERSION);
88 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
89 * @tf: Taskfile to convert
90 * @fis: Buffer into which data will output
91 * @pmp: Port multiplier port
93 * Converts a standard ATA taskfile to a Serial ATA
94 * FIS structure (Register - Host to Device).
97 * Inherited from caller.
100 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
102 fis[0] = 0x27; /* Register - Host to Device FIS */
103 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
104 bit 7 indicates Command FIS */
105 fis[2] = tf->command;
106 fis[3] = tf->feature;
113 fis[8] = tf->hob_lbal;
114 fis[9] = tf->hob_lbam;
115 fis[10] = tf->hob_lbah;
116 fis[11] = tf->hob_feature;
119 fis[13] = tf->hob_nsect;
130 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
131 * @fis: Buffer from which data will be input
132 * @tf: Taskfile to output
134 * Converts a serial ATA FIS structure to a standard ATA taskfile.
137 * Inherited from caller.
140 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
142 tf->command = fis[2]; /* status */
143 tf->feature = fis[3]; /* error */
150 tf->hob_lbal = fis[8];
151 tf->hob_lbam = fis[9];
152 tf->hob_lbah = fis[10];
155 tf->hob_nsect = fis[13];
158 static const u8 ata_rw_cmds[] = {
162 ATA_CMD_READ_MULTI_EXT,
163 ATA_CMD_WRITE_MULTI_EXT,
167 ATA_CMD_WRITE_MULTI_FUA_EXT,
171 ATA_CMD_PIO_READ_EXT,
172 ATA_CMD_PIO_WRITE_EXT,
185 ATA_CMD_WRITE_FUA_EXT
189 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
190 * @qc: command to examine and configure
192 * Examine the device configuration and tf->flags to calculate
193 * the proper read/write commands and protocol to use.
198 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
200 struct ata_taskfile *tf = &qc->tf;
201 struct ata_device *dev = qc->dev;
204 int index, fua, lba48, write;
206 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
207 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
208 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
210 if (dev->flags & ATA_DFLAG_PIO) {
211 tf->protocol = ATA_PROT_PIO;
212 index = dev->multi_count ? 0 : 8;
213 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
214 /* Unable to use DMA due to host limitation */
215 tf->protocol = ATA_PROT_PIO;
216 index = dev->multi_count ? 0 : 8;
218 tf->protocol = ATA_PROT_DMA;
222 cmd = ata_rw_cmds[index + fua + lba48 + write];
231 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
232 * @pio_mask: pio_mask
233 * @mwdma_mask: mwdma_mask
234 * @udma_mask: udma_mask
236 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
237 * unsigned int xfer_mask.
245 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
246 unsigned int mwdma_mask,
247 unsigned int udma_mask)
249 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
250 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
251 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
255 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
256 * @xfer_mask: xfer_mask to unpack
257 * @pio_mask: resulting pio_mask
258 * @mwdma_mask: resulting mwdma_mask
259 * @udma_mask: resulting udma_mask
261 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
262 * Any NULL distination masks will be ignored.
264 static void ata_unpack_xfermask(unsigned int xfer_mask,
265 unsigned int *pio_mask,
266 unsigned int *mwdma_mask,
267 unsigned int *udma_mask)
270 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
272 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
274 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
277 static const struct ata_xfer_ent {
278 unsigned int shift, bits;
281 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
282 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
283 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
288 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
289 * @xfer_mask: xfer_mask of interest
291 * Return matching XFER_* value for @xfer_mask. Only the highest
292 * bit of @xfer_mask is considered.
298 * Matching XFER_* value, 0 if no match found.
300 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
302 int highbit = fls(xfer_mask) - 1;
303 const struct ata_xfer_ent *ent;
305 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
306 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
307 return ent->base + highbit - ent->shift;
312 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
313 * @xfer_mode: XFER_* of interest
315 * Return matching xfer_mask for @xfer_mode.
321 * Matching xfer_mask, 0 if no match found.
323 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
325 const struct ata_xfer_ent *ent;
327 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
328 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
329 return 1 << (ent->shift + xfer_mode - ent->base);
334 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
335 * @xfer_mode: XFER_* of interest
337 * Return matching xfer_shift for @xfer_mode.
343 * Matching xfer_shift, -1 if no match found.
345 static int ata_xfer_mode2shift(unsigned int xfer_mode)
347 const struct ata_xfer_ent *ent;
349 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
350 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
356 * ata_mode_string - convert xfer_mask to string
357 * @xfer_mask: mask of bits supported; only highest bit counts.
359 * Determine string which represents the highest speed
360 * (highest bit in @modemask).
366 * Constant C string representing highest speed listed in
367 * @mode_mask, or the constant C string "<n/a>".
369 static const char *ata_mode_string(unsigned int xfer_mask)
371 static const char * const xfer_mode_str[] = {
391 highbit = fls(xfer_mask) - 1;
392 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
393 return xfer_mode_str[highbit];
398 * ata_pio_devchk - PATA device presence detection
399 * @ap: ATA channel to examine
400 * @device: Device to examine (starting at zero)
402 * This technique was originally described in
403 * Hale Landis's ATADRVR (www.ata-atapi.com), and
404 * later found its way into the ATA/ATAPI spec.
406 * Write a pattern to the ATA shadow registers,
407 * and if a device is present, it will respond by
408 * correctly storing and echoing back the
409 * ATA shadow register contents.
415 static unsigned int ata_pio_devchk(struct ata_port *ap,
418 struct ata_ioports *ioaddr = &ap->ioaddr;
421 ap->ops->dev_select(ap, device);
423 outb(0x55, ioaddr->nsect_addr);
424 outb(0xaa, ioaddr->lbal_addr);
426 outb(0xaa, ioaddr->nsect_addr);
427 outb(0x55, ioaddr->lbal_addr);
429 outb(0x55, ioaddr->nsect_addr);
430 outb(0xaa, ioaddr->lbal_addr);
432 nsect = inb(ioaddr->nsect_addr);
433 lbal = inb(ioaddr->lbal_addr);
435 if ((nsect == 0x55) && (lbal == 0xaa))
436 return 1; /* we found a device */
438 return 0; /* nothing found */
442 * ata_mmio_devchk - PATA device presence detection
443 * @ap: ATA channel to examine
444 * @device: Device to examine (starting at zero)
446 * This technique was originally described in
447 * Hale Landis's ATADRVR (www.ata-atapi.com), and
448 * later found its way into the ATA/ATAPI spec.
450 * Write a pattern to the ATA shadow registers,
451 * and if a device is present, it will respond by
452 * correctly storing and echoing back the
453 * ATA shadow register contents.
459 static unsigned int ata_mmio_devchk(struct ata_port *ap,
462 struct ata_ioports *ioaddr = &ap->ioaddr;
465 ap->ops->dev_select(ap, device);
467 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
468 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
470 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
471 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
473 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
474 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
476 nsect = readb((void __iomem *) ioaddr->nsect_addr);
477 lbal = readb((void __iomem *) ioaddr->lbal_addr);
479 if ((nsect == 0x55) && (lbal == 0xaa))
480 return 1; /* we found a device */
482 return 0; /* nothing found */
486 * ata_devchk - PATA device presence detection
487 * @ap: ATA channel to examine
488 * @device: Device to examine (starting at zero)
490 * Dispatch ATA device presence detection, depending
491 * on whether we are using PIO or MMIO to talk to the
492 * ATA shadow registers.
498 static unsigned int ata_devchk(struct ata_port *ap,
501 if (ap->flags & ATA_FLAG_MMIO)
502 return ata_mmio_devchk(ap, device);
503 return ata_pio_devchk(ap, device);
507 * ata_dev_classify - determine device type based on ATA-spec signature
508 * @tf: ATA taskfile register set for device to be identified
510 * Determine from taskfile register contents whether a device is
511 * ATA or ATAPI, as per "Signature and persistence" section
512 * of ATA/PI spec (volume 1, sect 5.14).
518 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
519 * the event of failure.
522 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
524 /* Apple's open source Darwin code hints that some devices only
525 * put a proper signature into the LBA mid/high registers,
526 * So, we only check those. It's sufficient for uniqueness.
529 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
530 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
531 DPRINTK("found ATA device by sig\n");
535 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
536 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
537 DPRINTK("found ATAPI device by sig\n");
538 return ATA_DEV_ATAPI;
541 DPRINTK("unknown device\n");
542 return ATA_DEV_UNKNOWN;
546 * ata_dev_try_classify - Parse returned ATA device signature
547 * @ap: ATA channel to examine
548 * @device: Device to examine (starting at zero)
549 * @r_err: Value of error register on completion
551 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
552 * an ATA/ATAPI-defined set of values is placed in the ATA
553 * shadow registers, indicating the results of device detection
556 * Select the ATA device, and read the values from the ATA shadow
557 * registers. Then parse according to the Error register value,
558 * and the spec-defined values examined by ata_dev_classify().
564 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
568 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
570 struct ata_taskfile tf;
574 ap->ops->dev_select(ap, device);
576 memset(&tf, 0, sizeof(tf));
578 ap->ops->tf_read(ap, &tf);
583 /* see if device passed diags */
586 else if ((device == 0) && (err == 0x81))
591 /* determine if device is ATA or ATAPI */
592 class = ata_dev_classify(&tf);
594 if (class == ATA_DEV_UNKNOWN)
596 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
602 * ata_id_string - Convert IDENTIFY DEVICE page into string
603 * @id: IDENTIFY DEVICE results we will examine
604 * @s: string into which data is output
605 * @ofs: offset into identify device page
606 * @len: length of string to return. must be an even number.
608 * The strings in the IDENTIFY DEVICE page are broken up into
609 * 16-bit chunks. Run through the string, and output each
610 * 8-bit chunk linearly, regardless of platform.
616 void ata_id_string(const u16 *id, unsigned char *s,
617 unsigned int ofs, unsigned int len)
636 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
637 * @id: IDENTIFY DEVICE results we will examine
638 * @s: string into which data is output
639 * @ofs: offset into identify device page
640 * @len: length of string to return. must be an odd number.
642 * This function is identical to ata_id_string except that it
643 * trims trailing spaces and terminates the resulting string with
644 * null. @len must be actual maximum length (even number) + 1.
649 void ata_id_c_string(const u16 *id, unsigned char *s,
650 unsigned int ofs, unsigned int len)
656 ata_id_string(id, s, ofs, len - 1);
658 p = s + strnlen(s, len - 1);
659 while (p > s && p[-1] == ' ')
664 static u64 ata_id_n_sectors(const u16 *id)
666 if (ata_id_has_lba(id)) {
667 if (ata_id_has_lba48(id))
668 return ata_id_u64(id, 100);
670 return ata_id_u32(id, 60);
672 if (ata_id_current_chs_valid(id))
673 return ata_id_u32(id, 57);
675 return id[1] * id[3] * id[6];
680 * ata_noop_dev_select - Select device 0/1 on ATA bus
681 * @ap: ATA channel to manipulate
682 * @device: ATA device (numbered from zero) to select
684 * This function performs no actual function.
686 * May be used as the dev_select() entry in ata_port_operations.
691 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
697 * ata_std_dev_select - Select device 0/1 on ATA bus
698 * @ap: ATA channel to manipulate
699 * @device: ATA device (numbered from zero) to select
701 * Use the method defined in the ATA specification to
702 * make either device 0, or device 1, active on the
703 * ATA channel. Works with both PIO and MMIO.
705 * May be used as the dev_select() entry in ata_port_operations.
711 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
716 tmp = ATA_DEVICE_OBS;
718 tmp = ATA_DEVICE_OBS | ATA_DEV1;
720 if (ap->flags & ATA_FLAG_MMIO) {
721 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
723 outb(tmp, ap->ioaddr.device_addr);
725 ata_pause(ap); /* needed; also flushes, for mmio */
729 * ata_dev_select - Select device 0/1 on ATA bus
730 * @ap: ATA channel to manipulate
731 * @device: ATA device (numbered from zero) to select
732 * @wait: non-zero to wait for Status register BSY bit to clear
733 * @can_sleep: non-zero if context allows sleeping
735 * Use the method defined in the ATA specification to
736 * make either device 0, or device 1, active on the
739 * This is a high-level version of ata_std_dev_select(),
740 * which additionally provides the services of inserting
741 * the proper pauses and status polling, where needed.
747 void ata_dev_select(struct ata_port *ap, unsigned int device,
748 unsigned int wait, unsigned int can_sleep)
750 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
751 ap->id, device, wait);
756 ap->ops->dev_select(ap, device);
759 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
766 * ata_dump_id - IDENTIFY DEVICE info debugging output
767 * @id: IDENTIFY DEVICE page to dump
769 * Dump selected 16-bit words from the given IDENTIFY DEVICE
776 static inline void ata_dump_id(const u16 *id)
778 DPRINTK("49==0x%04x "
788 DPRINTK("80==0x%04x "
798 DPRINTK("88==0x%04x "
805 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
806 * @id: IDENTIFY data to compute xfer mask from
808 * Compute the xfermask for this device. This is not as trivial
809 * as it seems if we must consider early devices correctly.
811 * FIXME: pre IDE drive timing (do we care ?).
819 static unsigned int ata_id_xfermask(const u16 *id)
821 unsigned int pio_mask, mwdma_mask, udma_mask;
823 /* Usual case. Word 53 indicates word 64 is valid */
824 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
825 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
829 /* If word 64 isn't valid then Word 51 high byte holds
830 * the PIO timing number for the maximum. Turn it into
833 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
835 /* But wait.. there's more. Design your standards by
836 * committee and you too can get a free iordy field to
837 * process. However its the speeds not the modes that
838 * are supported... Note drivers using the timing API
839 * will get this right anyway
843 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
846 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
847 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
849 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
853 * ata_port_queue_task - Queue port_task
854 * @ap: The ata_port to queue port_task for
856 * Schedule @fn(@data) for execution after @delay jiffies using
857 * port_task. There is one port_task per port and it's the
858 * user(low level driver)'s responsibility to make sure that only
859 * one task is active at any given time.
861 * libata core layer takes care of synchronization between
862 * port_task and EH. ata_port_queue_task() may be ignored for EH
866 * Inherited from caller.
868 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
873 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
876 PREPARE_WORK(&ap->port_task, fn, data);
879 rc = queue_work(ata_wq, &ap->port_task);
881 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
883 /* rc == 0 means that another user is using port task */
888 * ata_port_flush_task - Flush port_task
889 * @ap: The ata_port to flush port_task for
891 * After this function completes, port_task is guranteed not to
892 * be running or scheduled.
895 * Kernel thread context (may sleep)
897 void ata_port_flush_task(struct ata_port *ap)
903 spin_lock_irqsave(&ap->host_set->lock, flags);
904 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
905 spin_unlock_irqrestore(&ap->host_set->lock, flags);
907 DPRINTK("flush #1\n");
908 flush_workqueue(ata_wq);
911 * At this point, if a task is running, it's guaranteed to see
912 * the FLUSH flag; thus, it will never queue pio tasks again.
915 if (!cancel_delayed_work(&ap->port_task)) {
916 DPRINTK("flush #2\n");
917 flush_workqueue(ata_wq);
920 spin_lock_irqsave(&ap->host_set->lock, flags);
921 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
922 spin_unlock_irqrestore(&ap->host_set->lock, flags);
927 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
929 struct completion *waiting = qc->private_data;
931 qc->ap->ops->tf_read(qc->ap, &qc->tf);
936 * ata_exec_internal - execute libata internal command
937 * @ap: Port to which the command is sent
938 * @dev: Device to which the command is sent
939 * @tf: Taskfile registers for the command and the result
940 * @dma_dir: Data tranfer direction of the command
941 * @buf: Data buffer of the command
942 * @buflen: Length of data buffer
944 * Executes libata internal command with timeout. @tf contains
945 * command on entry and result on return. Timeout and error
946 * conditions are reported via return value. No recovery action
947 * is taken after a command times out. It's caller's duty to
948 * clean up after timeout.
951 * None. Should be called with kernel context, might sleep.
955 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
956 struct ata_taskfile *tf,
957 int dma_dir, void *buf, unsigned int buflen)
959 u8 command = tf->command;
960 struct ata_queued_cmd *qc;
961 DECLARE_COMPLETION(wait);
963 unsigned int err_mask;
965 spin_lock_irqsave(&ap->host_set->lock, flags);
967 qc = ata_qc_new_init(ap, dev);
971 qc->dma_dir = dma_dir;
972 if (dma_dir != DMA_NONE) {
973 ata_sg_init_one(qc, buf, buflen);
974 qc->nsect = buflen / ATA_SECT_SIZE;
977 qc->private_data = &wait;
978 qc->complete_fn = ata_qc_complete_internal;
980 qc->err_mask = ata_qc_issue(qc);
984 spin_unlock_irqrestore(&ap->host_set->lock, flags);
986 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
987 ata_port_flush_task(ap);
989 spin_lock_irqsave(&ap->host_set->lock, flags);
991 /* We're racing with irq here. If we lose, the
992 * following test prevents us from completing the qc
993 * again. If completion irq occurs after here but
994 * before the caller cleans up, it will result in a
995 * spurious interrupt. We can live with that.
997 if (qc->flags & ATA_QCFLAG_ACTIVE) {
998 qc->err_mask = AC_ERR_TIMEOUT;
1000 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
1004 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1008 err_mask = qc->err_mask;
1016 * ata_pio_need_iordy - check if iordy needed
1019 * Check if the current speed of the device requires IORDY. Used
1020 * by various controllers for chip configuration.
1023 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1026 int speed = adev->pio_mode - XFER_PIO_0;
1033 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1035 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1036 pio = adev->id[ATA_ID_EIDE_PIO];
1037 /* Is the speed faster than the drive allows non IORDY ? */
1039 /* This is cycle times not frequency - watch the logic! */
1040 if (pio > 240) /* PIO2 is 240nS per cycle */
1049 * ata_dev_read_id - Read ID data from the specified device
1050 * @ap: port on which target device resides
1051 * @dev: target device
1052 * @p_class: pointer to class of the target device (may be changed)
1053 * @post_reset: is this read ID post-reset?
1054 * @p_id: read IDENTIFY page (newly allocated)
1056 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1057 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1058 * devices. This function also takes care of EDD signature
1059 * misreporting (to be removed once EDD support is gone) and
1060 * issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
1063 * Kernel thread context (may sleep)
1066 * 0 on success, -errno otherwise.
1068 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
1069 unsigned int *p_class, int post_reset, u16 **p_id)
1071 unsigned int class = *p_class;
1072 unsigned int using_edd;
1073 struct ata_taskfile tf;
1074 unsigned int err_mask = 0;
1079 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1081 if (ap->ops->probe_reset ||
1082 ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
1087 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1089 id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
1092 reason = "out of memory";
1097 ata_tf_init(ap, &tf, dev->devno);
1101 tf.command = ATA_CMD_ID_ATA;
1104 tf.command = ATA_CMD_ID_ATAPI;
1108 reason = "unsupported class";
1112 tf.protocol = ATA_PROT_PIO;
1114 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
1115 id, sizeof(id[0]) * ATA_ID_WORDS);
1119 reason = "I/O error";
1121 if (err_mask & ~AC_ERR_DEV)
1125 * arg! EDD works for all test cases, but seems to return
1126 * the ATA signature for some ATAPI devices. Until the
1127 * reason for this is found and fixed, we fix up the mess
1128 * here. If IDENTIFY DEVICE returns command aborted
1129 * (as ATAPI devices do), then we issue an
1130 * IDENTIFY PACKET DEVICE.
1132 * ATA software reset (SRST, the default) does not appear
1133 * to have this problem.
1135 if ((using_edd) && (class == ATA_DEV_ATA)) {
1136 u8 err = tf.feature;
1137 if (err & ATA_ABORTED) {
1138 class = ATA_DEV_ATAPI;
1145 swap_buf_le16(id, ATA_ID_WORDS);
1148 if ((class == ATA_DEV_ATA) != ata_id_is_ata(id)) {
1150 reason = "device reports illegal type";
1154 if (post_reset && class == ATA_DEV_ATA) {
1156 * The exact sequence expected by certain pre-ATA4 drives is:
1159 * INITIALIZE DEVICE PARAMETERS
1161 * Some drives were very specific about that exact sequence.
1163 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1164 err_mask = ata_dev_init_params(ap, dev);
1167 reason = "INIT_DEV_PARAMS failed";
1171 /* current CHS translation info (id[53-58]) might be
1172 * changed. reread the identify device info.
1184 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1185 ap->id, dev->devno, reason);
1190 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1191 struct ata_device *dev)
1193 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1197 * ata_dev_configure - Configure the specified ATA/ATAPI device
1198 * @ap: Port on which target device resides
1199 * @dev: Target device to configure
1200 * @print_info: Enable device info printout
1202 * Configure @dev according to @dev->id. Generic and low-level
1203 * driver specific fixups are also applied.
1206 * Kernel thread context (may sleep)
1209 * 0 on success, -errno otherwise
1211 static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
1214 const u16 *id = dev->id;
1215 unsigned int xfer_mask;
1218 if (!ata_dev_present(dev)) {
1219 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1220 ap->id, dev->devno);
1224 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1226 /* print device capabilities */
1228 printk(KERN_DEBUG "ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1229 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1230 ap->id, dev->devno, id[49], id[82], id[83],
1231 id[84], id[85], id[86], id[87], id[88]);
1233 /* initialize to-be-configured parameters */
1235 dev->max_sectors = 0;
1243 * common ATA, ATAPI feature tests
1246 /* find max transfer mode; for printk only */
1247 xfer_mask = ata_id_xfermask(id);
1251 /* ATA-specific feature tests */
1252 if (dev->class == ATA_DEV_ATA) {
1253 dev->n_sectors = ata_id_n_sectors(id);
1255 if (ata_id_has_lba(id)) {
1256 const char *lba_desc;
1259 dev->flags |= ATA_DFLAG_LBA;
1260 if (ata_id_has_lba48(id)) {
1261 dev->flags |= ATA_DFLAG_LBA48;
1265 /* print device info to dmesg */
1267 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1268 "max %s, %Lu sectors: %s\n",
1270 ata_id_major_version(id),
1271 ata_mode_string(xfer_mask),
1272 (unsigned long long)dev->n_sectors,
1277 /* Default translation */
1278 dev->cylinders = id[1];
1280 dev->sectors = id[6];
1282 if (ata_id_current_chs_valid(id)) {
1283 /* Current CHS translation is valid. */
1284 dev->cylinders = id[54];
1285 dev->heads = id[55];
1286 dev->sectors = id[56];
1289 /* print device info to dmesg */
1291 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1292 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1294 ata_id_major_version(id),
1295 ata_mode_string(xfer_mask),
1296 (unsigned long long)dev->n_sectors,
1297 dev->cylinders, dev->heads, dev->sectors);
1303 /* ATAPI-specific feature tests */
1304 else if (dev->class == ATA_DEV_ATAPI) {
1305 rc = atapi_cdb_len(id);
1306 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1307 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1311 dev->cdb_len = (unsigned int) rc;
1313 /* print device info to dmesg */
1315 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1316 ap->id, dev->devno, ata_mode_string(xfer_mask));
1319 ap->host->max_cmd_len = 0;
1320 for (i = 0; i < ATA_MAX_DEVICES; i++)
1321 ap->host->max_cmd_len = max_t(unsigned int,
1322 ap->host->max_cmd_len,
1323 ap->device[i].cdb_len);
1325 /* limit bridge transfers to udma5, 200 sectors */
1326 if (ata_dev_knobble(ap, dev)) {
1328 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1329 ap->id, dev->devno);
1330 dev->udma_mask &= ATA_UDMA5;
1331 dev->max_sectors = ATA_MAX_SECTORS;
1334 if (ap->ops->dev_config)
1335 ap->ops->dev_config(ap, dev);
1337 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1341 printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
1342 ap->id, dev->devno);
1343 DPRINTK("EXIT, err\n");
1348 * ata_bus_probe - Reset and probe ATA bus
1351 * Master ATA bus probing function. Initiates a hardware-dependent
1352 * bus reset, then attempts to identify any devices found on
1356 * PCI/etc. bus probe sem.
1359 * Zero on success, non-zero on error.
1362 static int ata_bus_probe(struct ata_port *ap)
1364 unsigned int classes[ATA_MAX_DEVICES];
1365 unsigned int i, rc, found = 0;
1369 /* reset and determine device classes */
1370 for (i = 0; i < ATA_MAX_DEVICES; i++)
1371 classes[i] = ATA_DEV_UNKNOWN;
1373 if (ap->ops->probe_reset) {
1374 rc = ap->ops->probe_reset(ap, classes);
1376 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1380 ap->ops->phy_reset(ap);
1382 if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
1383 for (i = 0; i < ATA_MAX_DEVICES; i++)
1384 classes[i] = ap->device[i].class;
1389 for (i = 0; i < ATA_MAX_DEVICES; i++)
1390 if (classes[i] == ATA_DEV_UNKNOWN)
1391 classes[i] = ATA_DEV_NONE;
1393 /* read IDENTIFY page and configure devices */
1394 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1395 struct ata_device *dev = &ap->device[i];
1397 dev->class = classes[i];
1399 if (!ata_dev_present(dev))
1402 WARN_ON(dev->id != NULL);
1403 if (ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id)) {
1404 dev->class = ATA_DEV_NONE;
1408 if (ata_dev_configure(ap, dev, 1)) {
1409 dev->class++; /* disable device */
1417 goto err_out_disable;
1420 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1421 goto err_out_disable;
1426 ap->ops->port_disable(ap);
1431 * ata_port_probe - Mark port as enabled
1432 * @ap: Port for which we indicate enablement
1434 * Modify @ap data structure such that the system
1435 * thinks that the entire port is enabled.
1437 * LOCKING: host_set lock, or some other form of
1441 void ata_port_probe(struct ata_port *ap)
1443 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1447 * sata_print_link_status - Print SATA link status
1448 * @ap: SATA port to printk link status about
1450 * This function prints link speed and status of a SATA link.
1455 static void sata_print_link_status(struct ata_port *ap)
1460 if (!ap->ops->scr_read)
1463 sstatus = scr_read(ap, SCR_STATUS);
1465 if (sata_dev_present(ap)) {
1466 tmp = (sstatus >> 4) & 0xf;
1469 else if (tmp & (1 << 1))
1472 speed = "<unknown>";
1473 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1474 ap->id, speed, sstatus);
1476 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1482 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1483 * @ap: SATA port associated with target SATA PHY.
1485 * This function issues commands to standard SATA Sxxx
1486 * PHY registers, to wake up the phy (and device), and
1487 * clear any reset condition.
1490 * PCI/etc. bus probe sem.
1493 void __sata_phy_reset(struct ata_port *ap)
1496 unsigned long timeout = jiffies + (HZ * 5);
1498 if (ap->flags & ATA_FLAG_SATA_RESET) {
1499 /* issue phy wake/reset */
1500 scr_write_flush(ap, SCR_CONTROL, 0x301);
1501 /* Couldn't find anything in SATA I/II specs, but
1502 * AHCI-1.1 10.4.2 says at least 1 ms. */
1505 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1507 /* wait for phy to become ready, if necessary */
1510 sstatus = scr_read(ap, SCR_STATUS);
1511 if ((sstatus & 0xf) != 1)
1513 } while (time_before(jiffies, timeout));
1515 /* print link status */
1516 sata_print_link_status(ap);
1518 /* TODO: phy layer with polling, timeouts, etc. */
1519 if (sata_dev_present(ap))
1522 ata_port_disable(ap);
1524 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1527 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1528 ata_port_disable(ap);
1532 ap->cbl = ATA_CBL_SATA;
1536 * sata_phy_reset - Reset SATA bus.
1537 * @ap: SATA port associated with target SATA PHY.
1539 * This function resets the SATA bus, and then probes
1540 * the bus for devices.
1543 * PCI/etc. bus probe sem.
1546 void sata_phy_reset(struct ata_port *ap)
1548 __sata_phy_reset(ap);
1549 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1555 * ata_port_disable - Disable port.
1556 * @ap: Port to be disabled.
1558 * Modify @ap data structure such that the system
1559 * thinks that the entire port is disabled, and should
1560 * never attempt to probe or communicate with devices
1563 * LOCKING: host_set lock, or some other form of
1567 void ata_port_disable(struct ata_port *ap)
1569 ap->device[0].class = ATA_DEV_NONE;
1570 ap->device[1].class = ATA_DEV_NONE;
1571 ap->flags |= ATA_FLAG_PORT_DISABLED;
1575 * This mode timing computation functionality is ported over from
1576 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1579 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1580 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1581 * for PIO 5, which is a nonstandard extension and UDMA6, which
1582 * is currently supported only by Maxtor drives.
1585 static const struct ata_timing ata_timing[] = {
1587 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1588 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1589 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1590 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1592 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1593 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1594 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1596 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1598 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1599 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1600 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1602 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1603 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1604 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1606 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1607 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1608 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1610 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1611 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1612 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1614 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1619 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1620 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1622 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1624 q->setup = EZ(t->setup * 1000, T);
1625 q->act8b = EZ(t->act8b * 1000, T);
1626 q->rec8b = EZ(t->rec8b * 1000, T);
1627 q->cyc8b = EZ(t->cyc8b * 1000, T);
1628 q->active = EZ(t->active * 1000, T);
1629 q->recover = EZ(t->recover * 1000, T);
1630 q->cycle = EZ(t->cycle * 1000, T);
1631 q->udma = EZ(t->udma * 1000, UT);
1634 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1635 struct ata_timing *m, unsigned int what)
1637 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1638 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1639 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1640 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1641 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1642 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1643 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1644 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1647 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1649 const struct ata_timing *t;
1651 for (t = ata_timing; t->mode != speed; t++)
1652 if (t->mode == 0xFF)
1657 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1658 struct ata_timing *t, int T, int UT)
1660 const struct ata_timing *s;
1661 struct ata_timing p;
1667 if (!(s = ata_timing_find_mode(speed)))
1670 memcpy(t, s, sizeof(*s));
1673 * If the drive is an EIDE drive, it can tell us it needs extended
1674 * PIO/MW_DMA cycle timing.
1677 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1678 memset(&p, 0, sizeof(p));
1679 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1680 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1681 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1682 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1683 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1685 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1689 * Convert the timing to bus clock counts.
1692 ata_timing_quantize(t, t, T, UT);
1695 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1696 * S.M.A.R.T * and some other commands. We have to ensure that the
1697 * DMA cycle timing is slower/equal than the fastest PIO timing.
1700 if (speed > XFER_PIO_4) {
1701 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1702 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1706 * Lengthen active & recovery time so that cycle time is correct.
1709 if (t->act8b + t->rec8b < t->cyc8b) {
1710 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1711 t->rec8b = t->cyc8b - t->act8b;
1714 if (t->active + t->recover < t->cycle) {
1715 t->active += (t->cycle - (t->active + t->recover)) / 2;
1716 t->recover = t->cycle - t->active;
1722 static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1724 if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1727 if (dev->xfer_shift == ATA_SHIFT_PIO)
1728 dev->flags |= ATA_DFLAG_PIO;
1730 ata_dev_set_xfermode(ap, dev);
1732 if (ata_dev_revalidate(ap, dev, 0)) {
1733 printk(KERN_ERR "ata%u: failed to revalidate after set "
1734 "xfermode, disabled\n", ap->id);
1735 ata_port_disable(ap);
1738 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1739 dev->xfer_shift, (int)dev->xfer_mode);
1741 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1743 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1746 static int ata_host_set_pio(struct ata_port *ap)
1750 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1751 struct ata_device *dev = &ap->device[i];
1753 if (!ata_dev_present(dev))
1756 if (!dev->pio_mode) {
1757 printk(KERN_WARNING "ata%u: no PIO support for device %d.\n", ap->id, i);
1761 dev->xfer_mode = dev->pio_mode;
1762 dev->xfer_shift = ATA_SHIFT_PIO;
1763 if (ap->ops->set_piomode)
1764 ap->ops->set_piomode(ap, dev);
1770 static void ata_host_set_dma(struct ata_port *ap)
1774 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1775 struct ata_device *dev = &ap->device[i];
1777 if (!ata_dev_present(dev) || !dev->dma_mode)
1780 dev->xfer_mode = dev->dma_mode;
1781 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
1782 if (ap->ops->set_dmamode)
1783 ap->ops->set_dmamode(ap, dev);
1788 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1789 * @ap: port on which timings will be programmed
1791 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1794 * PCI/etc. bus probe sem.
1796 static void ata_set_mode(struct ata_port *ap)
1800 /* step 1: calculate xfer_mask */
1801 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1802 struct ata_device *dev = &ap->device[i];
1803 unsigned int pio_mask, dma_mask;
1805 if (!ata_dev_present(dev))
1808 ata_dev_xfermask(ap, dev);
1810 /* TODO: let LLDD filter dev->*_mask here */
1812 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
1813 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
1814 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
1815 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
1818 /* step 2: always set host PIO timings */
1819 rc = ata_host_set_pio(ap);
1823 /* step 3: set host DMA timings */
1824 ata_host_set_dma(ap);
1826 /* step 4: update devices' xfer mode */
1827 for (i = 0; i < ATA_MAX_DEVICES; i++)
1828 ata_dev_set_mode(ap, &ap->device[i]);
1830 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1833 if (ap->ops->post_set_mode)
1834 ap->ops->post_set_mode(ap);
1839 ata_port_disable(ap);
1843 * ata_tf_to_host - issue ATA taskfile to host controller
1844 * @ap: port to which command is being issued
1845 * @tf: ATA taskfile register set
1847 * Issues ATA taskfile register set to ATA host controller,
1848 * with proper synchronization with interrupt handler and
1852 * spin_lock_irqsave(host_set lock)
1855 static inline void ata_tf_to_host(struct ata_port *ap,
1856 const struct ata_taskfile *tf)
1858 ap->ops->tf_load(ap, tf);
1859 ap->ops->exec_command(ap, tf);
1863 * ata_busy_sleep - sleep until BSY clears, or timeout
1864 * @ap: port containing status register to be polled
1865 * @tmout_pat: impatience timeout
1866 * @tmout: overall timeout
1868 * Sleep until ATA Status register bit BSY clears,
1869 * or a timeout occurs.
1874 unsigned int ata_busy_sleep (struct ata_port *ap,
1875 unsigned long tmout_pat, unsigned long tmout)
1877 unsigned long timer_start, timeout;
1880 status = ata_busy_wait(ap, ATA_BUSY, 300);
1881 timer_start = jiffies;
1882 timeout = timer_start + tmout_pat;
1883 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1885 status = ata_busy_wait(ap, ATA_BUSY, 3);
1888 if (status & ATA_BUSY)
1889 printk(KERN_WARNING "ata%u is slow to respond, "
1890 "please be patient\n", ap->id);
1892 timeout = timer_start + tmout;
1893 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1895 status = ata_chk_status(ap);
1898 if (status & ATA_BUSY) {
1899 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1900 ap->id, tmout / HZ);
1907 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1909 struct ata_ioports *ioaddr = &ap->ioaddr;
1910 unsigned int dev0 = devmask & (1 << 0);
1911 unsigned int dev1 = devmask & (1 << 1);
1912 unsigned long timeout;
1914 /* if device 0 was found in ata_devchk, wait for its
1918 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1920 /* if device 1 was found in ata_devchk, wait for
1921 * register access, then wait for BSY to clear
1923 timeout = jiffies + ATA_TMOUT_BOOT;
1927 ap->ops->dev_select(ap, 1);
1928 if (ap->flags & ATA_FLAG_MMIO) {
1929 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1930 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1932 nsect = inb(ioaddr->nsect_addr);
1933 lbal = inb(ioaddr->lbal_addr);
1935 if ((nsect == 1) && (lbal == 1))
1937 if (time_after(jiffies, timeout)) {
1941 msleep(50); /* give drive a breather */
1944 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1946 /* is all this really necessary? */
1947 ap->ops->dev_select(ap, 0);
1949 ap->ops->dev_select(ap, 1);
1951 ap->ops->dev_select(ap, 0);
1955 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1956 * @ap: Port to reset and probe
1958 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1959 * probe the bus. Not often used these days.
1962 * PCI/etc. bus probe sem.
1963 * Obtains host_set lock.
1967 static unsigned int ata_bus_edd(struct ata_port *ap)
1969 struct ata_taskfile tf;
1970 unsigned long flags;
1972 /* set up execute-device-diag (bus reset) taskfile */
1973 /* also, take interrupts to a known state (disabled) */
1974 DPRINTK("execute-device-diag\n");
1975 ata_tf_init(ap, &tf, 0);
1977 tf.command = ATA_CMD_EDD;
1978 tf.protocol = ATA_PROT_NODATA;
1981 spin_lock_irqsave(&ap->host_set->lock, flags);
1982 ata_tf_to_host(ap, &tf);
1983 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1985 /* spec says at least 2ms. but who knows with those
1986 * crazy ATAPI devices...
1990 return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1993 static unsigned int ata_bus_softreset(struct ata_port *ap,
1994 unsigned int devmask)
1996 struct ata_ioports *ioaddr = &ap->ioaddr;
1998 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2000 /* software reset. causes dev0 to be selected */
2001 if (ap->flags & ATA_FLAG_MMIO) {
2002 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2003 udelay(20); /* FIXME: flush */
2004 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2005 udelay(20); /* FIXME: flush */
2006 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2008 outb(ap->ctl, ioaddr->ctl_addr);
2010 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2012 outb(ap->ctl, ioaddr->ctl_addr);
2015 /* spec mandates ">= 2ms" before checking status.
2016 * We wait 150ms, because that was the magic delay used for
2017 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2018 * between when the ATA command register is written, and then
2019 * status is checked. Because waiting for "a while" before
2020 * checking status is fine, post SRST, we perform this magic
2021 * delay here as well.
2023 * Old drivers/ide uses the 2mS rule and then waits for ready
2028 /* Before we perform post reset processing we want to see if
2029 the bus shows 0xFF because the odd clown forgets the D7 pulldown
2032 if (ata_check_status(ap) == 0xFF)
2033 return 1; /* Positive is failure for some reason */
2035 ata_bus_post_reset(ap, devmask);
2041 * ata_bus_reset - reset host port and associated ATA channel
2042 * @ap: port to reset
2044 * This is typically the first time we actually start issuing
2045 * commands to the ATA channel. We wait for BSY to clear, then
2046 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2047 * result. Determine what devices, if any, are on the channel
2048 * by looking at the device 0/1 error register. Look at the signature
2049 * stored in each device's taskfile registers, to determine if
2050 * the device is ATA or ATAPI.
2053 * PCI/etc. bus probe sem.
2054 * Obtains host_set lock.
2057 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2060 void ata_bus_reset(struct ata_port *ap)
2062 struct ata_ioports *ioaddr = &ap->ioaddr;
2063 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2065 unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
2067 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2069 /* determine if device 0/1 are present */
2070 if (ap->flags & ATA_FLAG_SATA_RESET)
2073 dev0 = ata_devchk(ap, 0);
2075 dev1 = ata_devchk(ap, 1);
2079 devmask |= (1 << 0);
2081 devmask |= (1 << 1);
2083 /* select device 0 again */
2084 ap->ops->dev_select(ap, 0);
2086 /* issue bus reset */
2087 if (ap->flags & ATA_FLAG_SRST)
2088 rc = ata_bus_softreset(ap, devmask);
2089 else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
2090 /* set up device control */
2091 if (ap->flags & ATA_FLAG_MMIO)
2092 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2094 outb(ap->ctl, ioaddr->ctl_addr);
2095 rc = ata_bus_edd(ap);
2102 * determine by signature whether we have ATA or ATAPI devices
2104 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2105 if ((slave_possible) && (err != 0x81))
2106 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2108 /* re-enable interrupts */
2109 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2112 /* is double-select really necessary? */
2113 if (ap->device[1].class != ATA_DEV_NONE)
2114 ap->ops->dev_select(ap, 1);
2115 if (ap->device[0].class != ATA_DEV_NONE)
2116 ap->ops->dev_select(ap, 0);
2118 /* if no devices were detected, disable this port */
2119 if ((ap->device[0].class == ATA_DEV_NONE) &&
2120 (ap->device[1].class == ATA_DEV_NONE))
2123 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2124 /* set up device control for ATA_FLAG_SATA_RESET */
2125 if (ap->flags & ATA_FLAG_MMIO)
2126 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2128 outb(ap->ctl, ioaddr->ctl_addr);
2135 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2136 ap->ops->port_disable(ap);
2141 static int sata_phy_resume(struct ata_port *ap)
2143 unsigned long timeout = jiffies + (HZ * 5);
2146 scr_write_flush(ap, SCR_CONTROL, 0x300);
2148 /* Wait for phy to become ready, if necessary. */
2151 sstatus = scr_read(ap, SCR_STATUS);
2152 if ((sstatus & 0xf) != 1)
2154 } while (time_before(jiffies, timeout));
2160 * ata_std_probeinit - initialize probing
2161 * @ap: port to be probed
2163 * @ap is about to be probed. Initialize it. This function is
2164 * to be used as standard callback for ata_drive_probe_reset().
2166 * NOTE!!! Do not use this function as probeinit if a low level
2167 * driver implements only hardreset. Just pass NULL as probeinit
2168 * in that case. Using this function is probably okay but doing
2169 * so makes reset sequence different from the original
2170 * ->phy_reset implementation and Jeff nervous. :-P
2172 extern void ata_std_probeinit(struct ata_port *ap)
2174 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
2175 sata_phy_resume(ap);
2176 if (sata_dev_present(ap))
2177 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2182 * ata_std_softreset - reset host port via ATA SRST
2183 * @ap: port to reset
2184 * @verbose: fail verbosely
2185 * @classes: resulting classes of attached devices
2187 * Reset host port using ATA SRST. This function is to be used
2188 * as standard callback for ata_drive_*_reset() functions.
2191 * Kernel thread context (may sleep)
2194 * 0 on success, -errno otherwise.
2196 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2198 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2199 unsigned int devmask = 0, err_mask;
2204 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2205 classes[0] = ATA_DEV_NONE;
2209 /* determine if device 0/1 are present */
2210 if (ata_devchk(ap, 0))
2211 devmask |= (1 << 0);
2212 if (slave_possible && ata_devchk(ap, 1))
2213 devmask |= (1 << 1);
2215 /* select device 0 again */
2216 ap->ops->dev_select(ap, 0);
2218 /* issue bus reset */
2219 DPRINTK("about to softreset, devmask=%x\n", devmask);
2220 err_mask = ata_bus_softreset(ap, devmask);
2223 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2226 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2231 /* determine by signature whether we have ATA or ATAPI devices */
2232 classes[0] = ata_dev_try_classify(ap, 0, &err);
2233 if (slave_possible && err != 0x81)
2234 classes[1] = ata_dev_try_classify(ap, 1, &err);
2237 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2242 * sata_std_hardreset - reset host port via SATA phy reset
2243 * @ap: port to reset
2244 * @verbose: fail verbosely
2245 * @class: resulting class of attached device
2247 * SATA phy-reset host port using DET bits of SControl register.
2248 * This function is to be used as standard callback for
2249 * ata_drive_*_reset().
2252 * Kernel thread context (may sleep)
2255 * 0 on success, -errno otherwise.
2257 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2261 /* Issue phy wake/reset */
2262 scr_write_flush(ap, SCR_CONTROL, 0x301);
2265 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2266 * 10.4.2 says at least 1 ms.
2270 /* Bring phy back */
2271 sata_phy_resume(ap);
2273 /* TODO: phy layer with polling, timeouts, etc. */
2274 if (!sata_dev_present(ap)) {
2275 *class = ATA_DEV_NONE;
2276 DPRINTK("EXIT, link offline\n");
2280 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2282 printk(KERN_ERR "ata%u: COMRESET failed "
2283 "(device not ready)\n", ap->id);
2285 DPRINTK("EXIT, device not ready\n");
2289 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2291 *class = ata_dev_try_classify(ap, 0, NULL);
2293 DPRINTK("EXIT, class=%u\n", *class);
2298 * ata_std_postreset - standard postreset callback
2299 * @ap: the target ata_port
2300 * @classes: classes of attached devices
2302 * This function is invoked after a successful reset. Note that
2303 * the device might have been reset more than once using
2304 * different reset methods before postreset is invoked.
2306 * This function is to be used as standard callback for
2307 * ata_drive_*_reset().
2310 * Kernel thread context (may sleep)
2312 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2316 /* set cable type if it isn't already set */
2317 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2318 ap->cbl = ATA_CBL_SATA;
2320 /* print link status */
2321 if (ap->cbl == ATA_CBL_SATA)
2322 sata_print_link_status(ap);
2324 /* re-enable interrupts */
2325 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2328 /* is double-select really necessary? */
2329 if (classes[0] != ATA_DEV_NONE)
2330 ap->ops->dev_select(ap, 1);
2331 if (classes[1] != ATA_DEV_NONE)
2332 ap->ops->dev_select(ap, 0);
2334 /* bail out if no device is present */
2335 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2336 DPRINTK("EXIT, no device\n");
2340 /* set up device control */
2341 if (ap->ioaddr.ctl_addr) {
2342 if (ap->flags & ATA_FLAG_MMIO)
2343 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2345 outb(ap->ctl, ap->ioaddr.ctl_addr);
2352 * ata_std_probe_reset - standard probe reset method
2353 * @ap: prot to perform probe-reset
2354 * @classes: resulting classes of attached devices
2356 * The stock off-the-shelf ->probe_reset method.
2359 * Kernel thread context (may sleep)
2362 * 0 on success, -errno otherwise.
2364 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2366 ata_reset_fn_t hardreset;
2369 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2370 hardreset = sata_std_hardreset;
2372 return ata_drive_probe_reset(ap, ata_std_probeinit,
2373 ata_std_softreset, hardreset,
2374 ata_std_postreset, classes);
2377 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2378 ata_postreset_fn_t postreset,
2379 unsigned int *classes)
2383 for (i = 0; i < ATA_MAX_DEVICES; i++)
2384 classes[i] = ATA_DEV_UNKNOWN;
2386 rc = reset(ap, 0, classes);
2390 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2391 * is complete and convert all ATA_DEV_UNKNOWN to
2394 for (i = 0; i < ATA_MAX_DEVICES; i++)
2395 if (classes[i] != ATA_DEV_UNKNOWN)
2398 if (i < ATA_MAX_DEVICES)
2399 for (i = 0; i < ATA_MAX_DEVICES; i++)
2400 if (classes[i] == ATA_DEV_UNKNOWN)
2401 classes[i] = ATA_DEV_NONE;
2404 postreset(ap, classes);
2406 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2410 * ata_drive_probe_reset - Perform probe reset with given methods
2411 * @ap: port to reset
2412 * @probeinit: probeinit method (can be NULL)
2413 * @softreset: softreset method (can be NULL)
2414 * @hardreset: hardreset method (can be NULL)
2415 * @postreset: postreset method (can be NULL)
2416 * @classes: resulting classes of attached devices
2418 * Reset the specified port and classify attached devices using
2419 * given methods. This function prefers softreset but tries all
2420 * possible reset sequences to reset and classify devices. This
2421 * function is intended to be used for constructing ->probe_reset
2422 * callback by low level drivers.
2424 * Reset methods should follow the following rules.
2426 * - Return 0 on sucess, -errno on failure.
2427 * - If classification is supported, fill classes[] with
2428 * recognized class codes.
2429 * - If classification is not supported, leave classes[] alone.
2430 * - If verbose is non-zero, print error message on failure;
2431 * otherwise, shut up.
2434 * Kernel thread context (may sleep)
2437 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2438 * if classification fails, and any error code from reset
2441 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2442 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2443 ata_postreset_fn_t postreset, unsigned int *classes)
2451 rc = do_probe_reset(ap, softreset, postreset, classes);
2459 rc = do_probe_reset(ap, hardreset, postreset, classes);
2460 if (rc == 0 || rc != -ENODEV)
2464 rc = do_probe_reset(ap, softreset, postreset, classes);
2470 * ata_dev_same_device - Determine whether new ID matches configured device
2471 * @ap: port on which the device to compare against resides
2472 * @dev: device to compare against
2473 * @new_class: class of the new device
2474 * @new_id: IDENTIFY page of the new device
2476 * Compare @new_class and @new_id against @dev and determine
2477 * whether @dev is the device indicated by @new_class and
2484 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2486 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2487 unsigned int new_class, const u16 *new_id)
2489 const u16 *old_id = dev->id;
2490 unsigned char model[2][41], serial[2][21];
2493 if (dev->class != new_class) {
2495 "ata%u: dev %u class mismatch %d != %d\n",
2496 ap->id, dev->devno, dev->class, new_class);
2500 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2501 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2502 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2503 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2504 new_n_sectors = ata_id_n_sectors(new_id);
2506 if (strcmp(model[0], model[1])) {
2508 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2509 ap->id, dev->devno, model[0], model[1]);
2513 if (strcmp(serial[0], serial[1])) {
2515 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2516 ap->id, dev->devno, serial[0], serial[1]);
2520 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2522 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2523 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2524 (unsigned long long)new_n_sectors);
2532 * ata_dev_revalidate - Revalidate ATA device
2533 * @ap: port on which the device to revalidate resides
2534 * @dev: device to revalidate
2535 * @post_reset: is this revalidation after reset?
2537 * Re-read IDENTIFY page and make sure @dev is still attached to
2541 * Kernel thread context (may sleep)
2544 * 0 on success, negative errno otherwise
2546 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2553 if (!ata_dev_present(dev))
2559 /* allocate & read ID data */
2560 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2564 /* is the device still there? */
2565 if (!ata_dev_same_device(ap, dev, class, id)) {
2573 /* configure device according to the new ID */
2574 return ata_dev_configure(ap, dev, 0);
2577 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2578 ap->id, dev->devno, rc);
2583 static const char * const ata_dma_blacklist [] = {
2584 "WDC AC11000H", NULL,
2585 "WDC AC22100H", NULL,
2586 "WDC AC32500H", NULL,
2587 "WDC AC33100H", NULL,
2588 "WDC AC31600H", NULL,
2589 "WDC AC32100H", "24.09P07",
2590 "WDC AC23200L", "21.10N21",
2591 "Compaq CRD-8241B", NULL,
2596 "SanDisk SDP3B", NULL,
2597 "SanDisk SDP3B-64", NULL,
2598 "SANYO CD-ROM CRD", NULL,
2599 "HITACHI CDR-8", NULL,
2600 "HITACHI CDR-8335", NULL,
2601 "HITACHI CDR-8435", NULL,
2602 "Toshiba CD-ROM XM-6202B", NULL,
2603 "TOSHIBA CD-ROM XM-1702BC", NULL,
2605 "E-IDE CD-ROM CR-840", NULL,
2606 "CD-ROM Drive/F5A", NULL,
2607 "WPI CDD-820", NULL,
2608 "SAMSUNG CD-ROM SC-148C", NULL,
2609 "SAMSUNG CD-ROM SC", NULL,
2610 "SanDisk SDP3B-64", NULL,
2611 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2612 "_NEC DV5800A", NULL,
2613 "SAMSUNG CD-ROM SN-124", "N001"
2616 static int ata_strim(char *s, size_t len)
2618 len = strnlen(s, len);
2620 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2621 while ((len > 0) && (s[len - 1] == ' ')) {
2628 static int ata_dma_blacklisted(const struct ata_device *dev)
2630 unsigned char model_num[40];
2631 unsigned char model_rev[16];
2632 unsigned int nlen, rlen;
2635 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2637 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2639 nlen = ata_strim(model_num, sizeof(model_num));
2640 rlen = ata_strim(model_rev, sizeof(model_rev));
2642 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2643 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2644 if (ata_dma_blacklist[i+1] == NULL)
2646 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2654 * ata_dev_xfermask - Compute supported xfermask of the given device
2655 * @ap: Port on which the device to compute xfermask for resides
2656 * @dev: Device to compute xfermask for
2658 * Compute supported xfermask of @dev and store it in
2659 * dev->*_mask. This function is responsible for applying all
2660 * known limits including host controller limits, device
2666 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
2668 unsigned long xfer_mask;
2671 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
2674 /* use port-wide xfermask for now */
2675 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2676 struct ata_device *d = &ap->device[i];
2677 if (!ata_dev_present(d))
2679 xfer_mask &= ata_pack_xfermask(d->pio_mask, d->mwdma_mask,
2681 xfer_mask &= ata_id_xfermask(d->id);
2682 if (ata_dma_blacklisted(d))
2683 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2686 if (ata_dma_blacklisted(dev))
2687 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2688 "disabling DMA\n", ap->id, dev->devno);
2690 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2695 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2696 * @ap: Port associated with device @dev
2697 * @dev: Device to which command will be sent
2699 * Issue SET FEATURES - XFER MODE command to device @dev
2703 * PCI/etc. bus probe sem.
2706 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
2708 struct ata_taskfile tf;
2710 /* set up set-features taskfile */
2711 DPRINTK("set features - xfer mode\n");
2713 ata_tf_init(ap, &tf, dev->devno);
2714 tf.command = ATA_CMD_SET_FEATURES;
2715 tf.feature = SETFEATURES_XFER;
2716 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2717 tf.protocol = ATA_PROT_NODATA;
2718 tf.nsect = dev->xfer_mode;
2720 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2721 printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
2723 ata_port_disable(ap);
2730 * ata_dev_init_params - Issue INIT DEV PARAMS command
2731 * @ap: Port associated with device @dev
2732 * @dev: Device to which command will be sent
2735 * Kernel thread context (may sleep)
2738 * 0 on success, AC_ERR_* mask otherwise.
2741 static unsigned int ata_dev_init_params(struct ata_port *ap,
2742 struct ata_device *dev)
2744 struct ata_taskfile tf;
2745 unsigned int err_mask;
2746 u16 sectors = dev->id[6];
2747 u16 heads = dev->id[3];
2749 /* Number of sectors per track 1-255. Number of heads 1-16 */
2750 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2753 /* set up init dev params taskfile */
2754 DPRINTK("init dev params \n");
2756 ata_tf_init(ap, &tf, dev->devno);
2757 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2758 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2759 tf.protocol = ATA_PROT_NODATA;
2761 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2763 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2765 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2770 * ata_sg_clean - Unmap DMA memory associated with command
2771 * @qc: Command containing DMA memory to be released
2773 * Unmap all mapped DMA memory associated with this command.
2776 * spin_lock_irqsave(host_set lock)
2779 static void ata_sg_clean(struct ata_queued_cmd *qc)
2781 struct ata_port *ap = qc->ap;
2782 struct scatterlist *sg = qc->__sg;
2783 int dir = qc->dma_dir;
2784 void *pad_buf = NULL;
2786 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2787 WARN_ON(sg == NULL);
2789 if (qc->flags & ATA_QCFLAG_SINGLE)
2790 WARN_ON(qc->n_elem > 1);
2792 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2794 /* if we padded the buffer out to 32-bit bound, and data
2795 * xfer direction is from-device, we must copy from the
2796 * pad buffer back into the supplied buffer
2798 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2799 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2801 if (qc->flags & ATA_QCFLAG_SG) {
2803 dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
2804 /* restore last sg */
2805 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2807 struct scatterlist *psg = &qc->pad_sgent;
2808 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2809 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2810 kunmap_atomic(addr, KM_IRQ0);
2814 dma_unmap_single(ap->host_set->dev,
2815 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2818 sg->length += qc->pad_len;
2820 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2821 pad_buf, qc->pad_len);
2824 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2829 * ata_fill_sg - Fill PCI IDE PRD table
2830 * @qc: Metadata associated with taskfile to be transferred
2832 * Fill PCI IDE PRD (scatter-gather) table with segments
2833 * associated with the current disk command.
2836 * spin_lock_irqsave(host_set lock)
2839 static void ata_fill_sg(struct ata_queued_cmd *qc)
2841 struct ata_port *ap = qc->ap;
2842 struct scatterlist *sg;
2845 WARN_ON(qc->__sg == NULL);
2846 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2849 ata_for_each_sg(sg, qc) {
2853 /* determine if physical DMA addr spans 64K boundary.
2854 * Note h/w doesn't support 64-bit, so we unconditionally
2855 * truncate dma_addr_t to u32.
2857 addr = (u32) sg_dma_address(sg);
2858 sg_len = sg_dma_len(sg);
2861 offset = addr & 0xffff;
2863 if ((offset + sg_len) > 0x10000)
2864 len = 0x10000 - offset;
2866 ap->prd[idx].addr = cpu_to_le32(addr);
2867 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2868 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2877 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2880 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2881 * @qc: Metadata associated with taskfile to check
2883 * Allow low-level driver to filter ATA PACKET commands, returning
2884 * a status indicating whether or not it is OK to use DMA for the
2885 * supplied PACKET command.
2888 * spin_lock_irqsave(host_set lock)
2890 * RETURNS: 0 when ATAPI DMA can be used
2893 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2895 struct ata_port *ap = qc->ap;
2896 int rc = 0; /* Assume ATAPI DMA is OK by default */
2898 if (ap->ops->check_atapi_dma)
2899 rc = ap->ops->check_atapi_dma(qc);
2904 * ata_qc_prep - Prepare taskfile for submission
2905 * @qc: Metadata associated with taskfile to be prepared
2907 * Prepare ATA taskfile for submission.
2910 * spin_lock_irqsave(host_set lock)
2912 void ata_qc_prep(struct ata_queued_cmd *qc)
2914 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2920 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
2923 * ata_sg_init_one - Associate command with memory buffer
2924 * @qc: Command to be associated
2925 * @buf: Memory buffer
2926 * @buflen: Length of memory buffer, in bytes.
2928 * Initialize the data-related elements of queued_cmd @qc
2929 * to point to a single memory buffer, @buf of byte length @buflen.
2932 * spin_lock_irqsave(host_set lock)
2935 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2937 struct scatterlist *sg;
2939 qc->flags |= ATA_QCFLAG_SINGLE;
2941 memset(&qc->sgent, 0, sizeof(qc->sgent));
2942 qc->__sg = &qc->sgent;
2944 qc->orig_n_elem = 1;
2948 sg_init_one(sg, buf, buflen);
2952 * ata_sg_init - Associate command with scatter-gather table.
2953 * @qc: Command to be associated
2954 * @sg: Scatter-gather table.
2955 * @n_elem: Number of elements in s/g table.
2957 * Initialize the data-related elements of queued_cmd @qc
2958 * to point to a scatter-gather table @sg, containing @n_elem
2962 * spin_lock_irqsave(host_set lock)
2965 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2966 unsigned int n_elem)
2968 qc->flags |= ATA_QCFLAG_SG;
2970 qc->n_elem = n_elem;
2971 qc->orig_n_elem = n_elem;
2975 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2976 * @qc: Command with memory buffer to be mapped.
2978 * DMA-map the memory buffer associated with queued_cmd @qc.
2981 * spin_lock_irqsave(host_set lock)
2984 * Zero on success, negative on error.
2987 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
2989 struct ata_port *ap = qc->ap;
2990 int dir = qc->dma_dir;
2991 struct scatterlist *sg = qc->__sg;
2992 dma_addr_t dma_address;
2995 /* we must lengthen transfers to end on a 32-bit boundary */
2996 qc->pad_len = sg->length & 3;
2998 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2999 struct scatterlist *psg = &qc->pad_sgent;
3001 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3003 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3005 if (qc->tf.flags & ATA_TFLAG_WRITE)
3006 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3009 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3010 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3012 sg->length -= qc->pad_len;
3013 if (sg->length == 0)
3016 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3017 sg->length, qc->pad_len);
3025 dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
3027 if (dma_mapping_error(dma_address)) {
3029 sg->length += qc->pad_len;
3033 sg_dma_address(sg) = dma_address;
3034 sg_dma_len(sg) = sg->length;
3037 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3038 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3044 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3045 * @qc: Command with scatter-gather table to be mapped.
3047 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3050 * spin_lock_irqsave(host_set lock)
3053 * Zero on success, negative on error.
3057 static int ata_sg_setup(struct ata_queued_cmd *qc)
3059 struct ata_port *ap = qc->ap;
3060 struct scatterlist *sg = qc->__sg;
3061 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3062 int n_elem, pre_n_elem, dir, trim_sg = 0;
3064 VPRINTK("ENTER, ata%u\n", ap->id);
3065 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3067 /* we must lengthen transfers to end on a 32-bit boundary */
3068 qc->pad_len = lsg->length & 3;
3070 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3071 struct scatterlist *psg = &qc->pad_sgent;
3072 unsigned int offset;
3074 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3076 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3079 * psg->page/offset are used to copy to-be-written
3080 * data in this function or read data in ata_sg_clean.
3082 offset = lsg->offset + lsg->length - qc->pad_len;
3083 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3084 psg->offset = offset_in_page(offset);
3086 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3087 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3088 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3089 kunmap_atomic(addr, KM_IRQ0);
3092 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3093 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3095 lsg->length -= qc->pad_len;
3096 if (lsg->length == 0)
3099 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3100 qc->n_elem - 1, lsg->length, qc->pad_len);
3103 pre_n_elem = qc->n_elem;
3104 if (trim_sg && pre_n_elem)
3113 n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
3115 /* restore last sg */
3116 lsg->length += qc->pad_len;
3120 DPRINTK("%d sg elements mapped\n", n_elem);
3123 qc->n_elem = n_elem;
3129 * ata_poll_qc_complete - turn irq back on and finish qc
3130 * @qc: Command to complete
3131 * @err_mask: ATA status register content
3134 * None. (grabs host lock)
3137 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3139 struct ata_port *ap = qc->ap;
3140 unsigned long flags;
3142 spin_lock_irqsave(&ap->host_set->lock, flags);
3143 ap->flags &= ~ATA_FLAG_NOINTR;
3145 ata_qc_complete(qc);
3146 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3150 * ata_pio_poll - poll using PIO, depending on current state
3151 * @ap: the target ata_port
3154 * None. (executing in kernel thread context)
3157 * timeout value to use
3160 static unsigned long ata_pio_poll(struct ata_port *ap)
3162 struct ata_queued_cmd *qc;
3164 unsigned int poll_state = HSM_ST_UNKNOWN;
3165 unsigned int reg_state = HSM_ST_UNKNOWN;
3167 qc = ata_qc_from_tag(ap, ap->active_tag);
3168 WARN_ON(qc == NULL);
3170 switch (ap->hsm_task_state) {
3173 poll_state = HSM_ST_POLL;
3177 case HSM_ST_LAST_POLL:
3178 poll_state = HSM_ST_LAST_POLL;
3179 reg_state = HSM_ST_LAST;
3186 status = ata_chk_status(ap);
3187 if (status & ATA_BUSY) {
3188 if (time_after(jiffies, ap->pio_task_timeout)) {
3189 qc->err_mask |= AC_ERR_TIMEOUT;
3190 ap->hsm_task_state = HSM_ST_TMOUT;
3193 ap->hsm_task_state = poll_state;
3194 return ATA_SHORT_PAUSE;
3197 ap->hsm_task_state = reg_state;
3202 * ata_pio_complete - check if drive is busy or idle
3203 * @ap: the target ata_port
3206 * None. (executing in kernel thread context)
3209 * Non-zero if qc completed, zero otherwise.
3212 static int ata_pio_complete (struct ata_port *ap)
3214 struct ata_queued_cmd *qc;
3218 * This is purely heuristic. This is a fast path. Sometimes when
3219 * we enter, BSY will be cleared in a chk-status or two. If not,
3220 * the drive is probably seeking or something. Snooze for a couple
3221 * msecs, then chk-status again. If still busy, fall back to
3222 * HSM_ST_POLL state.
3224 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3225 if (drv_stat & ATA_BUSY) {
3227 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3228 if (drv_stat & ATA_BUSY) {
3229 ap->hsm_task_state = HSM_ST_LAST_POLL;
3230 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3235 qc = ata_qc_from_tag(ap, ap->active_tag);
3236 WARN_ON(qc == NULL);
3238 drv_stat = ata_wait_idle(ap);
3239 if (!ata_ok(drv_stat)) {
3240 qc->err_mask |= __ac_err_mask(drv_stat);
3241 ap->hsm_task_state = HSM_ST_ERR;
3245 ap->hsm_task_state = HSM_ST_IDLE;
3247 WARN_ON(qc->err_mask);
3248 ata_poll_qc_complete(qc);
3250 /* another command may start at this point */
3257 * swap_buf_le16 - swap halves of 16-bit words in place
3258 * @buf: Buffer to swap
3259 * @buf_words: Number of 16-bit words in buffer.
3261 * Swap halves of 16-bit words if needed to convert from
3262 * little-endian byte order to native cpu byte order, or
3266 * Inherited from caller.
3268 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3273 for (i = 0; i < buf_words; i++)
3274 buf[i] = le16_to_cpu(buf[i]);
3275 #endif /* __BIG_ENDIAN */
3279 * ata_mmio_data_xfer - Transfer data by MMIO
3280 * @ap: port to read/write
3282 * @buflen: buffer length
3283 * @write_data: read/write
3285 * Transfer data from/to the device data register by MMIO.
3288 * Inherited from caller.
3291 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3292 unsigned int buflen, int write_data)
3295 unsigned int words = buflen >> 1;
3296 u16 *buf16 = (u16 *) buf;
3297 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3299 /* Transfer multiple of 2 bytes */
3301 for (i = 0; i < words; i++)
3302 writew(le16_to_cpu(buf16[i]), mmio);
3304 for (i = 0; i < words; i++)
3305 buf16[i] = cpu_to_le16(readw(mmio));
3308 /* Transfer trailing 1 byte, if any. */
3309 if (unlikely(buflen & 0x01)) {
3310 u16 align_buf[1] = { 0 };
3311 unsigned char *trailing_buf = buf + buflen - 1;
3314 memcpy(align_buf, trailing_buf, 1);
3315 writew(le16_to_cpu(align_buf[0]), mmio);
3317 align_buf[0] = cpu_to_le16(readw(mmio));
3318 memcpy(trailing_buf, align_buf, 1);
3324 * ata_pio_data_xfer - Transfer data by PIO
3325 * @ap: port to read/write
3327 * @buflen: buffer length
3328 * @write_data: read/write
3330 * Transfer data from/to the device data register by PIO.
3333 * Inherited from caller.
3336 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3337 unsigned int buflen, int write_data)
3339 unsigned int words = buflen >> 1;
3341 /* Transfer multiple of 2 bytes */
3343 outsw(ap->ioaddr.data_addr, buf, words);
3345 insw(ap->ioaddr.data_addr, buf, words);
3347 /* Transfer trailing 1 byte, if any. */
3348 if (unlikely(buflen & 0x01)) {
3349 u16 align_buf[1] = { 0 };
3350 unsigned char *trailing_buf = buf + buflen - 1;
3353 memcpy(align_buf, trailing_buf, 1);
3354 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3356 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3357 memcpy(trailing_buf, align_buf, 1);
3363 * ata_data_xfer - Transfer data from/to the data register.
3364 * @ap: port to read/write
3366 * @buflen: buffer length
3367 * @do_write: read/write
3369 * Transfer data from/to the device data register.
3372 * Inherited from caller.
3375 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3376 unsigned int buflen, int do_write)
3378 /* Make the crap hardware pay the costs not the good stuff */
3379 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3380 unsigned long flags;
3381 local_irq_save(flags);
3382 if (ap->flags & ATA_FLAG_MMIO)
3383 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3385 ata_pio_data_xfer(ap, buf, buflen, do_write);
3386 local_irq_restore(flags);
3388 if (ap->flags & ATA_FLAG_MMIO)
3389 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3391 ata_pio_data_xfer(ap, buf, buflen, do_write);
3396 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3397 * @qc: Command on going
3399 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3402 * Inherited from caller.
3405 static void ata_pio_sector(struct ata_queued_cmd *qc)
3407 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3408 struct scatterlist *sg = qc->__sg;
3409 struct ata_port *ap = qc->ap;
3411 unsigned int offset;
3414 if (qc->cursect == (qc->nsect - 1))
3415 ap->hsm_task_state = HSM_ST_LAST;
3417 page = sg[qc->cursg].page;
3418 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3420 /* get the current page and offset */
3421 page = nth_page(page, (offset >> PAGE_SHIFT));
3422 offset %= PAGE_SIZE;
3424 buf = kmap(page) + offset;
3429 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3434 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3436 /* do the actual data transfer */
3437 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3438 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3444 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3445 * @qc: Command on going
3446 * @bytes: number of bytes
3448 * Transfer Transfer data from/to the ATAPI device.
3451 * Inherited from caller.
3455 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3457 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3458 struct scatterlist *sg = qc->__sg;
3459 struct ata_port *ap = qc->ap;
3462 unsigned int offset, count;
3464 if (qc->curbytes + bytes >= qc->nbytes)
3465 ap->hsm_task_state = HSM_ST_LAST;
3468 if (unlikely(qc->cursg >= qc->n_elem)) {
3470 * The end of qc->sg is reached and the device expects
3471 * more data to transfer. In order not to overrun qc->sg
3472 * and fulfill length specified in the byte count register,
3473 * - for read case, discard trailing data from the device
3474 * - for write case, padding zero data to the device
3476 u16 pad_buf[1] = { 0 };
3477 unsigned int words = bytes >> 1;
3480 if (words) /* warning if bytes > 1 */
3481 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3484 for (i = 0; i < words; i++)
3485 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3487 ap->hsm_task_state = HSM_ST_LAST;
3491 sg = &qc->__sg[qc->cursg];
3494 offset = sg->offset + qc->cursg_ofs;
3496 /* get the current page and offset */
3497 page = nth_page(page, (offset >> PAGE_SHIFT));
3498 offset %= PAGE_SIZE;
3500 /* don't overrun current sg */
3501 count = min(sg->length - qc->cursg_ofs, bytes);
3503 /* don't cross page boundaries */
3504 count = min(count, (unsigned int)PAGE_SIZE - offset);
3506 buf = kmap(page) + offset;
3509 qc->curbytes += count;
3510 qc->cursg_ofs += count;
3512 if (qc->cursg_ofs == sg->length) {
3517 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3519 /* do the actual data transfer */
3520 ata_data_xfer(ap, buf, count, do_write);
3529 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3530 * @qc: Command on going
3532 * Transfer Transfer data from/to the ATAPI device.
3535 * Inherited from caller.
3538 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3540 struct ata_port *ap = qc->ap;
3541 struct ata_device *dev = qc->dev;
3542 unsigned int ireason, bc_lo, bc_hi, bytes;
3543 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3545 ap->ops->tf_read(ap, &qc->tf);
3546 ireason = qc->tf.nsect;
3547 bc_lo = qc->tf.lbam;
3548 bc_hi = qc->tf.lbah;
3549 bytes = (bc_hi << 8) | bc_lo;
3551 /* shall be cleared to zero, indicating xfer of data */
3552 if (ireason & (1 << 0))
3555 /* make sure transfer direction matches expected */
3556 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3557 if (do_write != i_write)
3560 __atapi_pio_bytes(qc, bytes);
3565 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3566 ap->id, dev->devno);
3567 qc->err_mask |= AC_ERR_HSM;
3568 ap->hsm_task_state = HSM_ST_ERR;
3572 * ata_pio_block - start PIO on a block
3573 * @ap: the target ata_port
3576 * None. (executing in kernel thread context)
3579 static void ata_pio_block(struct ata_port *ap)
3581 struct ata_queued_cmd *qc;
3585 * This is purely heuristic. This is a fast path.
3586 * Sometimes when we enter, BSY will be cleared in
3587 * a chk-status or two. If not, the drive is probably seeking
3588 * or something. Snooze for a couple msecs, then
3589 * chk-status again. If still busy, fall back to
3590 * HSM_ST_POLL state.
3592 status = ata_busy_wait(ap, ATA_BUSY, 5);
3593 if (status & ATA_BUSY) {
3595 status = ata_busy_wait(ap, ATA_BUSY, 10);
3596 if (status & ATA_BUSY) {
3597 ap->hsm_task_state = HSM_ST_POLL;
3598 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3603 qc = ata_qc_from_tag(ap, ap->active_tag);
3604 WARN_ON(qc == NULL);
3607 if (status & (ATA_ERR | ATA_DF)) {
3608 qc->err_mask |= AC_ERR_DEV;
3609 ap->hsm_task_state = HSM_ST_ERR;
3613 /* transfer data if any */
3614 if (is_atapi_taskfile(&qc->tf)) {
3615 /* DRQ=0 means no more data to transfer */
3616 if ((status & ATA_DRQ) == 0) {
3617 ap->hsm_task_state = HSM_ST_LAST;
3621 atapi_pio_bytes(qc);
3623 /* handle BSY=0, DRQ=0 as error */
3624 if ((status & ATA_DRQ) == 0) {
3625 qc->err_mask |= AC_ERR_HSM;
3626 ap->hsm_task_state = HSM_ST_ERR;
3634 static void ata_pio_error(struct ata_port *ap)
3636 struct ata_queued_cmd *qc;
3638 qc = ata_qc_from_tag(ap, ap->active_tag);
3639 WARN_ON(qc == NULL);
3641 if (qc->tf.command != ATA_CMD_PACKET)
3642 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3644 /* make sure qc->err_mask is available to
3645 * know what's wrong and recover
3647 WARN_ON(qc->err_mask == 0);
3649 ap->hsm_task_state = HSM_ST_IDLE;
3651 ata_poll_qc_complete(qc);
3654 static void ata_pio_task(void *_data)
3656 struct ata_port *ap = _data;
3657 unsigned long timeout;
3664 switch (ap->hsm_task_state) {
3673 qc_completed = ata_pio_complete(ap);
3677 case HSM_ST_LAST_POLL:
3678 timeout = ata_pio_poll(ap);
3688 ata_port_queue_task(ap, ata_pio_task, ap, timeout);
3689 else if (!qc_completed)
3694 * atapi_packet_task - Write CDB bytes to hardware
3695 * @_data: Port to which ATAPI device is attached.
3697 * When device has indicated its readiness to accept
3698 * a CDB, this function is called. Send the CDB.
3699 * If DMA is to be performed, exit immediately.
3700 * Otherwise, we are in polling mode, so poll
3701 * status under operation succeeds or fails.
3704 * Kernel thread context (may sleep)
3707 static void atapi_packet_task(void *_data)
3709 struct ata_port *ap = _data;
3710 struct ata_queued_cmd *qc;
3713 qc = ata_qc_from_tag(ap, ap->active_tag);
3714 WARN_ON(qc == NULL);
3715 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3717 /* sleep-wait for BSY to clear */
3718 DPRINTK("busy wait\n");
3719 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3720 qc->err_mask |= AC_ERR_TIMEOUT;
3724 /* make sure DRQ is set */
3725 status = ata_chk_status(ap);
3726 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3727 qc->err_mask |= AC_ERR_HSM;
3732 DPRINTK("send cdb\n");
3733 WARN_ON(qc->dev->cdb_len < 12);
3735 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3736 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3737 unsigned long flags;
3739 /* Once we're done issuing command and kicking bmdma,
3740 * irq handler takes over. To not lose irq, we need
3741 * to clear NOINTR flag before sending cdb, but
3742 * interrupt handler shouldn't be invoked before we're
3743 * finished. Hence, the following locking.
3745 spin_lock_irqsave(&ap->host_set->lock, flags);
3746 ap->flags &= ~ATA_FLAG_NOINTR;
3747 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3748 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3749 ap->ops->bmdma_start(qc); /* initiate bmdma */
3750 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3752 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3754 /* PIO commands are handled by polling */
3755 ap->hsm_task_state = HSM_ST;
3756 ata_port_queue_task(ap, ata_pio_task, ap, 0);
3762 ata_poll_qc_complete(qc);
3766 * ata_qc_timeout - Handle timeout of queued command
3767 * @qc: Command that timed out
3769 * Some part of the kernel (currently, only the SCSI layer)
3770 * has noticed that the active command on port @ap has not
3771 * completed after a specified length of time. Handle this
3772 * condition by disabling DMA (if necessary) and completing
3773 * transactions, with error if necessary.
3775 * This also handles the case of the "lost interrupt", where
3776 * for some reason (possibly hardware bug, possibly driver bug)
3777 * an interrupt was not delivered to the driver, even though the
3778 * transaction completed successfully.
3781 * Inherited from SCSI layer (none, can sleep)
3784 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3786 struct ata_port *ap = qc->ap;
3787 struct ata_host_set *host_set = ap->host_set;
3788 u8 host_stat = 0, drv_stat;
3789 unsigned long flags;
3793 ap->hsm_task_state = HSM_ST_IDLE;
3795 spin_lock_irqsave(&host_set->lock, flags);
3797 switch (qc->tf.protocol) {
3800 case ATA_PROT_ATAPI_DMA:
3801 host_stat = ap->ops->bmdma_status(ap);
3803 /* before we do anything else, clear DMA-Start bit */
3804 ap->ops->bmdma_stop(qc);
3810 drv_stat = ata_chk_status(ap);
3812 /* ack bmdma irq events */
3813 ap->ops->irq_clear(ap);
3815 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3816 ap->id, qc->tf.command, drv_stat, host_stat);
3818 /* complete taskfile transaction */
3819 qc->err_mask |= ac_err_mask(drv_stat);
3823 spin_unlock_irqrestore(&host_set->lock, flags);
3825 ata_eh_qc_complete(qc);
3831 * ata_eng_timeout - Handle timeout of queued command
3832 * @ap: Port on which timed-out command is active
3834 * Some part of the kernel (currently, only the SCSI layer)
3835 * has noticed that the active command on port @ap has not
3836 * completed after a specified length of time. Handle this
3837 * condition by disabling DMA (if necessary) and completing
3838 * transactions, with error if necessary.
3840 * This also handles the case of the "lost interrupt", where
3841 * for some reason (possibly hardware bug, possibly driver bug)
3842 * an interrupt was not delivered to the driver, even though the
3843 * transaction completed successfully.
3846 * Inherited from SCSI layer (none, can sleep)
3849 void ata_eng_timeout(struct ata_port *ap)
3853 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3859 * ata_qc_new - Request an available ATA command, for queueing
3860 * @ap: Port associated with device @dev
3861 * @dev: Device from whom we request an available command structure
3867 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3869 struct ata_queued_cmd *qc = NULL;
3872 for (i = 0; i < ATA_MAX_QUEUE; i++)
3873 if (!test_and_set_bit(i, &ap->qactive)) {
3874 qc = ata_qc_from_tag(ap, i);
3885 * ata_qc_new_init - Request an available ATA command, and initialize it
3886 * @ap: Port associated with device @dev
3887 * @dev: Device from whom we request an available command structure
3893 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3894 struct ata_device *dev)
3896 struct ata_queued_cmd *qc;
3898 qc = ata_qc_new(ap);
3911 * ata_qc_free - free unused ata_queued_cmd
3912 * @qc: Command to complete
3914 * Designed to free unused ata_queued_cmd object
3915 * in case something prevents using it.
3918 * spin_lock_irqsave(host_set lock)
3920 void ata_qc_free(struct ata_queued_cmd *qc)
3922 struct ata_port *ap = qc->ap;
3925 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3929 if (likely(ata_tag_valid(tag))) {
3930 if (tag == ap->active_tag)
3931 ap->active_tag = ATA_TAG_POISON;
3932 qc->tag = ATA_TAG_POISON;
3933 clear_bit(tag, &ap->qactive);
3937 void __ata_qc_complete(struct ata_queued_cmd *qc)
3939 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3940 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3942 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3945 /* atapi: mark qc as inactive to prevent the interrupt handler
3946 * from completing the command twice later, before the error handler
3947 * is called. (when rc != 0 and atapi request sense is needed)
3949 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3951 /* call completion callback */
3952 qc->complete_fn(qc);
3955 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3957 struct ata_port *ap = qc->ap;
3959 switch (qc->tf.protocol) {
3961 case ATA_PROT_ATAPI_DMA:
3964 case ATA_PROT_ATAPI:
3966 if (ap->flags & ATA_FLAG_PIO_DMA)
3979 * ata_qc_issue - issue taskfile to device
3980 * @qc: command to issue to device
3982 * Prepare an ATA command to submission to device.
3983 * This includes mapping the data into a DMA-able
3984 * area, filling in the S/G table, and finally
3985 * writing the taskfile to hardware, starting the command.
3988 * spin_lock_irqsave(host_set lock)
3991 * Zero on success, AC_ERR_* mask on failure
3994 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
3996 struct ata_port *ap = qc->ap;
3998 if (ata_should_dma_map(qc)) {
3999 if (qc->flags & ATA_QCFLAG_SG) {
4000 if (ata_sg_setup(qc))
4002 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4003 if (ata_sg_setup_one(qc))
4007 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4010 ap->ops->qc_prep(qc);
4012 qc->ap->active_tag = qc->tag;
4013 qc->flags |= ATA_QCFLAG_ACTIVE;
4015 return ap->ops->qc_issue(qc);
4018 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4019 return AC_ERR_SYSTEM;
4024 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4025 * @qc: command to issue to device
4027 * Using various libata functions and hooks, this function
4028 * starts an ATA command. ATA commands are grouped into
4029 * classes called "protocols", and issuing each type of protocol
4030 * is slightly different.
4032 * May be used as the qc_issue() entry in ata_port_operations.
4035 * spin_lock_irqsave(host_set lock)
4038 * Zero on success, AC_ERR_* mask on failure
4041 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4043 struct ata_port *ap = qc->ap;
4045 ata_dev_select(ap, qc->dev->devno, 1, 0);
4047 switch (qc->tf.protocol) {
4048 case ATA_PROT_NODATA:
4049 ata_tf_to_host(ap, &qc->tf);
4053 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4054 ap->ops->bmdma_setup(qc); /* set up bmdma */
4055 ap->ops->bmdma_start(qc); /* initiate bmdma */
4058 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4059 ata_qc_set_polling(qc);
4060 ata_tf_to_host(ap, &qc->tf);
4061 ap->hsm_task_state = HSM_ST;
4062 ata_port_queue_task(ap, ata_pio_task, ap, 0);
4065 case ATA_PROT_ATAPI:
4066 ata_qc_set_polling(qc);
4067 ata_tf_to_host(ap, &qc->tf);
4068 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4071 case ATA_PROT_ATAPI_NODATA:
4072 ap->flags |= ATA_FLAG_NOINTR;
4073 ata_tf_to_host(ap, &qc->tf);
4074 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4077 case ATA_PROT_ATAPI_DMA:
4078 ap->flags |= ATA_FLAG_NOINTR;
4079 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4080 ap->ops->bmdma_setup(qc); /* set up bmdma */
4081 ata_port_queue_task(ap, atapi_packet_task, ap, 0);
4086 return AC_ERR_SYSTEM;
4093 * ata_host_intr - Handle host interrupt for given (port, task)
4094 * @ap: Port on which interrupt arrived (possibly...)
4095 * @qc: Taskfile currently active in engine
4097 * Handle host interrupt for given queued command. Currently,
4098 * only DMA interrupts are handled. All other commands are
4099 * handled via polling with interrupts disabled (nIEN bit).
4102 * spin_lock_irqsave(host_set lock)
4105 * One if interrupt was handled, zero if not (shared irq).
4108 inline unsigned int ata_host_intr (struct ata_port *ap,
4109 struct ata_queued_cmd *qc)
4111 u8 status, host_stat;
4113 switch (qc->tf.protocol) {
4116 case ATA_PROT_ATAPI_DMA:
4117 case ATA_PROT_ATAPI:
4118 /* check status of DMA engine */
4119 host_stat = ap->ops->bmdma_status(ap);
4120 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4122 /* if it's not our irq... */
4123 if (!(host_stat & ATA_DMA_INTR))
4126 /* before we do anything else, clear DMA-Start bit */
4127 ap->ops->bmdma_stop(qc);
4131 case ATA_PROT_ATAPI_NODATA:
4132 case ATA_PROT_NODATA:
4133 /* check altstatus */
4134 status = ata_altstatus(ap);
4135 if (status & ATA_BUSY)
4138 /* check main status, clearing INTRQ */
4139 status = ata_chk_status(ap);
4140 if (unlikely(status & ATA_BUSY))
4142 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4143 ap->id, qc->tf.protocol, status);
4145 /* ack bmdma irq events */
4146 ap->ops->irq_clear(ap);
4148 /* complete taskfile transaction */
4149 qc->err_mask |= ac_err_mask(status);
4150 ata_qc_complete(qc);
4157 return 1; /* irq handled */
4160 ap->stats.idle_irq++;
4163 if ((ap->stats.idle_irq % 1000) == 0) {
4164 ata_irq_ack(ap, 0); /* debug trap */
4165 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4169 return 0; /* irq not handled */
4173 * ata_interrupt - Default ATA host interrupt handler
4174 * @irq: irq line (unused)
4175 * @dev_instance: pointer to our ata_host_set information structure
4178 * Default interrupt handler for PCI IDE devices. Calls
4179 * ata_host_intr() for each port that is not disabled.
4182 * Obtains host_set lock during operation.
4185 * IRQ_NONE or IRQ_HANDLED.
4188 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4190 struct ata_host_set *host_set = dev_instance;
4192 unsigned int handled = 0;
4193 unsigned long flags;
4195 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4196 spin_lock_irqsave(&host_set->lock, flags);
4198 for (i = 0; i < host_set->n_ports; i++) {
4199 struct ata_port *ap;
4201 ap = host_set->ports[i];
4203 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4204 struct ata_queued_cmd *qc;
4206 qc = ata_qc_from_tag(ap, ap->active_tag);
4207 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4208 (qc->flags & ATA_QCFLAG_ACTIVE))
4209 handled |= ata_host_intr(ap, qc);
4213 spin_unlock_irqrestore(&host_set->lock, flags);
4215 return IRQ_RETVAL(handled);
4220 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4221 * without filling any other registers
4223 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4226 struct ata_taskfile tf;
4229 ata_tf_init(ap, &tf, dev->devno);
4232 tf.flags |= ATA_TFLAG_DEVICE;
4233 tf.protocol = ATA_PROT_NODATA;
4235 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4237 printk(KERN_ERR "%s: ata command failed: %d\n",
4243 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4247 if (!ata_try_flush_cache(dev))
4250 if (ata_id_has_flush_ext(dev->id))
4251 cmd = ATA_CMD_FLUSH_EXT;
4253 cmd = ATA_CMD_FLUSH;
4255 return ata_do_simple_cmd(ap, dev, cmd);
4258 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4260 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4263 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4265 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4269 * ata_device_resume - wakeup a previously suspended devices
4270 * @ap: port the device is connected to
4271 * @dev: the device to resume
4273 * Kick the drive back into action, by sending it an idle immediate
4274 * command and making sure its transfer mode matches between drive
4278 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4280 if (ap->flags & ATA_FLAG_SUSPENDED) {
4281 ap->flags &= ~ATA_FLAG_SUSPENDED;
4284 if (!ata_dev_present(dev))
4286 if (dev->class == ATA_DEV_ATA)
4287 ata_start_drive(ap, dev);
4293 * ata_device_suspend - prepare a device for suspend
4294 * @ap: port the device is connected to
4295 * @dev: the device to suspend
4297 * Flush the cache on the drive, if appropriate, then issue a
4298 * standbynow command.
4300 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
4302 if (!ata_dev_present(dev))
4304 if (dev->class == ATA_DEV_ATA)
4305 ata_flush_cache(ap, dev);
4307 ata_standby_drive(ap, dev);
4308 ap->flags |= ATA_FLAG_SUSPENDED;
4313 * ata_port_start - Set port up for dma.
4314 * @ap: Port to initialize
4316 * Called just after data structures for each port are
4317 * initialized. Allocates space for PRD table.
4319 * May be used as the port_start() entry in ata_port_operations.
4322 * Inherited from caller.
4325 int ata_port_start (struct ata_port *ap)
4327 struct device *dev = ap->host_set->dev;
4330 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4334 rc = ata_pad_alloc(ap, dev);
4336 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4340 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4347 * ata_port_stop - Undo ata_port_start()
4348 * @ap: Port to shut down
4350 * Frees the PRD table.
4352 * May be used as the port_stop() entry in ata_port_operations.
4355 * Inherited from caller.
4358 void ata_port_stop (struct ata_port *ap)
4360 struct device *dev = ap->host_set->dev;
4362 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4363 ata_pad_free(ap, dev);
4366 void ata_host_stop (struct ata_host_set *host_set)
4368 if (host_set->mmio_base)
4369 iounmap(host_set->mmio_base);
4374 * ata_host_remove - Unregister SCSI host structure with upper layers
4375 * @ap: Port to unregister
4376 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4379 * Inherited from caller.
4382 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4384 struct Scsi_Host *sh = ap->host;
4389 scsi_remove_host(sh);
4391 ap->ops->port_stop(ap);
4395 * ata_host_init - Initialize an ata_port structure
4396 * @ap: Structure to initialize
4397 * @host: associated SCSI mid-layer structure
4398 * @host_set: Collection of hosts to which @ap belongs
4399 * @ent: Probe information provided by low-level driver
4400 * @port_no: Port number associated with this ata_port
4402 * Initialize a new ata_port structure, and its associated
4406 * Inherited from caller.
4409 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4410 struct ata_host_set *host_set,
4411 const struct ata_probe_ent *ent, unsigned int port_no)
4417 host->max_channel = 1;
4418 host->unique_id = ata_unique_id++;
4419 host->max_cmd_len = 12;
4421 ap->flags = ATA_FLAG_PORT_DISABLED;
4422 ap->id = host->unique_id;
4424 ap->ctl = ATA_DEVCTL_OBS;
4425 ap->host_set = host_set;
4426 ap->port_no = port_no;
4428 ent->legacy_mode ? ent->hard_port_no : port_no;
4429 ap->pio_mask = ent->pio_mask;
4430 ap->mwdma_mask = ent->mwdma_mask;
4431 ap->udma_mask = ent->udma_mask;
4432 ap->flags |= ent->host_flags;
4433 ap->ops = ent->port_ops;
4434 ap->cbl = ATA_CBL_NONE;
4435 ap->active_tag = ATA_TAG_POISON;
4436 ap->last_ctl = 0xFF;
4438 INIT_WORK(&ap->port_task, NULL, NULL);
4439 INIT_LIST_HEAD(&ap->eh_done_q);
4441 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4442 struct ata_device *dev = &ap->device[i];
4444 dev->pio_mask = UINT_MAX;
4445 dev->mwdma_mask = UINT_MAX;
4446 dev->udma_mask = UINT_MAX;
4450 ap->stats.unhandled_irq = 1;
4451 ap->stats.idle_irq = 1;
4454 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4458 * ata_host_add - Attach low-level ATA driver to system
4459 * @ent: Information provided by low-level driver
4460 * @host_set: Collections of ports to which we add
4461 * @port_no: Port number associated with this host
4463 * Attach low-level ATA driver to system.
4466 * PCI/etc. bus probe sem.
4469 * New ata_port on success, for NULL on error.
4472 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4473 struct ata_host_set *host_set,
4474 unsigned int port_no)
4476 struct Scsi_Host *host;
4477 struct ata_port *ap;
4481 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4485 host->transportt = &ata_scsi_transport_template;
4487 ap = (struct ata_port *) &host->hostdata[0];
4489 ata_host_init(ap, host, host_set, ent, port_no);
4491 rc = ap->ops->port_start(ap);
4498 scsi_host_put(host);
4503 * ata_device_add - Register hardware device with ATA and SCSI layers
4504 * @ent: Probe information describing hardware device to be registered
4506 * This function processes the information provided in the probe
4507 * information struct @ent, allocates the necessary ATA and SCSI
4508 * host information structures, initializes them, and registers
4509 * everything with requisite kernel subsystems.
4511 * This function requests irqs, probes the ATA bus, and probes
4515 * PCI/etc. bus probe sem.
4518 * Number of ports registered. Zero on error (no ports registered).
4521 int ata_device_add(const struct ata_probe_ent *ent)
4523 unsigned int count = 0, i;
4524 struct device *dev = ent->dev;
4525 struct ata_host_set *host_set;
4528 /* alloc a container for our list of ATA ports (buses) */
4529 host_set = kzalloc(sizeof(struct ata_host_set) +
4530 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4533 spin_lock_init(&host_set->lock);
4535 host_set->dev = dev;
4536 host_set->n_ports = ent->n_ports;
4537 host_set->irq = ent->irq;
4538 host_set->mmio_base = ent->mmio_base;
4539 host_set->private_data = ent->private_data;
4540 host_set->ops = ent->port_ops;
4542 /* register each port bound to this device */
4543 for (i = 0; i < ent->n_ports; i++) {
4544 struct ata_port *ap;
4545 unsigned long xfer_mode_mask;
4547 ap = ata_host_add(ent, host_set, i);
4551 host_set->ports[i] = ap;
4552 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4553 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4554 (ap->pio_mask << ATA_SHIFT_PIO);
4556 /* print per-port info to dmesg */
4557 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4558 "bmdma 0x%lX irq %lu\n",
4560 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4561 ata_mode_string(xfer_mode_mask),
4562 ap->ioaddr.cmd_addr,
4563 ap->ioaddr.ctl_addr,
4564 ap->ioaddr.bmdma_addr,
4568 host_set->ops->irq_clear(ap);
4575 /* obtain irq, that is shared between channels */
4576 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4577 DRV_NAME, host_set))
4580 /* perform each probe synchronously */
4581 DPRINTK("probe begin\n");
4582 for (i = 0; i < count; i++) {
4583 struct ata_port *ap;
4586 ap = host_set->ports[i];
4588 DPRINTK("ata%u: bus probe begin\n", ap->id);
4589 rc = ata_bus_probe(ap);
4590 DPRINTK("ata%u: bus probe end\n", ap->id);
4593 /* FIXME: do something useful here?
4594 * Current libata behavior will
4595 * tear down everything when
4596 * the module is removed
4597 * or the h/w is unplugged.
4601 rc = scsi_add_host(ap->host, dev);
4603 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4605 /* FIXME: do something useful here */
4606 /* FIXME: handle unconditional calls to
4607 * scsi_scan_host and ata_host_remove, below,
4613 /* probes are done, now scan each port's disk(s) */
4614 DPRINTK("host probe begin\n");
4615 for (i = 0; i < count; i++) {
4616 struct ata_port *ap = host_set->ports[i];
4618 ata_scsi_scan_host(ap);
4621 dev_set_drvdata(dev, host_set);
4623 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4624 return ent->n_ports; /* success */
4627 for (i = 0; i < count; i++) {
4628 ata_host_remove(host_set->ports[i], 1);
4629 scsi_host_put(host_set->ports[i]->host);
4633 VPRINTK("EXIT, returning 0\n");
4638 * ata_host_set_remove - PCI layer callback for device removal
4639 * @host_set: ATA host set that was removed
4641 * Unregister all objects associated with this host set. Free those
4645 * Inherited from calling layer (may sleep).
4648 void ata_host_set_remove(struct ata_host_set *host_set)
4650 struct ata_port *ap;
4653 for (i = 0; i < host_set->n_ports; i++) {
4654 ap = host_set->ports[i];
4655 scsi_remove_host(ap->host);
4658 free_irq(host_set->irq, host_set);
4660 for (i = 0; i < host_set->n_ports; i++) {
4661 ap = host_set->ports[i];
4663 ata_scsi_release(ap->host);
4665 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4666 struct ata_ioports *ioaddr = &ap->ioaddr;
4668 if (ioaddr->cmd_addr == 0x1f0)
4669 release_region(0x1f0, 8);
4670 else if (ioaddr->cmd_addr == 0x170)
4671 release_region(0x170, 8);
4674 scsi_host_put(ap->host);
4677 if (host_set->ops->host_stop)
4678 host_set->ops->host_stop(host_set);
4684 * ata_scsi_release - SCSI layer callback hook for host unload
4685 * @host: libata host to be unloaded
4687 * Performs all duties necessary to shut down a libata port...
4688 * Kill port kthread, disable port, and release resources.
4691 * Inherited from SCSI layer.
4697 int ata_scsi_release(struct Scsi_Host *host)
4699 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4704 ap->ops->port_disable(ap);
4705 ata_host_remove(ap, 0);
4706 for (i = 0; i < ATA_MAX_DEVICES; i++)
4707 kfree(ap->device[i].id);
4714 * ata_std_ports - initialize ioaddr with standard port offsets.
4715 * @ioaddr: IO address structure to be initialized
4717 * Utility function which initializes data_addr, error_addr,
4718 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4719 * device_addr, status_addr, and command_addr to standard offsets
4720 * relative to cmd_addr.
4722 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4725 void ata_std_ports(struct ata_ioports *ioaddr)
4727 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4728 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4729 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4730 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4731 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4732 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4733 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4734 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4735 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4736 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4742 void ata_pci_host_stop (struct ata_host_set *host_set)
4744 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4746 pci_iounmap(pdev, host_set->mmio_base);
4750 * ata_pci_remove_one - PCI layer callback for device removal
4751 * @pdev: PCI device that was removed
4753 * PCI layer indicates to libata via this hook that
4754 * hot-unplug or module unload event has occurred.
4755 * Handle this by unregistering all objects associated
4756 * with this PCI device. Free those objects. Then finally
4757 * release PCI resources and disable device.
4760 * Inherited from PCI layer (may sleep).
4763 void ata_pci_remove_one (struct pci_dev *pdev)
4765 struct device *dev = pci_dev_to_dev(pdev);
4766 struct ata_host_set *host_set = dev_get_drvdata(dev);
4768 ata_host_set_remove(host_set);
4769 pci_release_regions(pdev);
4770 pci_disable_device(pdev);
4771 dev_set_drvdata(dev, NULL);
4774 /* move to PCI subsystem */
4775 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4777 unsigned long tmp = 0;
4779 switch (bits->width) {
4782 pci_read_config_byte(pdev, bits->reg, &tmp8);
4788 pci_read_config_word(pdev, bits->reg, &tmp16);
4794 pci_read_config_dword(pdev, bits->reg, &tmp32);
4805 return (tmp == bits->val) ? 1 : 0;
4808 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4810 pci_save_state(pdev);
4811 pci_disable_device(pdev);
4812 pci_set_power_state(pdev, PCI_D3hot);
4816 int ata_pci_device_resume(struct pci_dev *pdev)
4818 pci_set_power_state(pdev, PCI_D0);
4819 pci_restore_state(pdev);
4820 pci_enable_device(pdev);
4821 pci_set_master(pdev);
4824 #endif /* CONFIG_PCI */
4827 static int __init ata_init(void)
4829 ata_wq = create_workqueue("ata");
4833 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4837 static void __exit ata_exit(void)
4839 destroy_workqueue(ata_wq);
4842 module_init(ata_init);
4843 module_exit(ata_exit);
4845 static unsigned long ratelimit_time;
4846 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4848 int ata_ratelimit(void)
4851 unsigned long flags;
4853 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4855 if (time_after(jiffies, ratelimit_time)) {
4857 ratelimit_time = jiffies + (HZ/5);
4861 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4867 * libata is essentially a library of internal helper functions for
4868 * low-level ATA host controller drivers. As such, the API/ABI is
4869 * likely to change as new drivers are added and updated.
4870 * Do not depend on ABI/API stability.
4873 EXPORT_SYMBOL_GPL(ata_std_bios_param);
4874 EXPORT_SYMBOL_GPL(ata_std_ports);
4875 EXPORT_SYMBOL_GPL(ata_device_add);
4876 EXPORT_SYMBOL_GPL(ata_host_set_remove);
4877 EXPORT_SYMBOL_GPL(ata_sg_init);
4878 EXPORT_SYMBOL_GPL(ata_sg_init_one);
4879 EXPORT_SYMBOL_GPL(__ata_qc_complete);
4880 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4881 EXPORT_SYMBOL_GPL(ata_eng_timeout);
4882 EXPORT_SYMBOL_GPL(ata_tf_load);
4883 EXPORT_SYMBOL_GPL(ata_tf_read);
4884 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4885 EXPORT_SYMBOL_GPL(ata_std_dev_select);
4886 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4887 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4888 EXPORT_SYMBOL_GPL(ata_check_status);
4889 EXPORT_SYMBOL_GPL(ata_altstatus);
4890 EXPORT_SYMBOL_GPL(ata_exec_command);
4891 EXPORT_SYMBOL_GPL(ata_port_start);
4892 EXPORT_SYMBOL_GPL(ata_port_stop);
4893 EXPORT_SYMBOL_GPL(ata_host_stop);
4894 EXPORT_SYMBOL_GPL(ata_interrupt);
4895 EXPORT_SYMBOL_GPL(ata_qc_prep);
4896 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
4897 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4898 EXPORT_SYMBOL_GPL(ata_bmdma_start);
4899 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4900 EXPORT_SYMBOL_GPL(ata_bmdma_status);
4901 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4902 EXPORT_SYMBOL_GPL(ata_port_probe);
4903 EXPORT_SYMBOL_GPL(sata_phy_reset);
4904 EXPORT_SYMBOL_GPL(__sata_phy_reset);
4905 EXPORT_SYMBOL_GPL(ata_bus_reset);
4906 EXPORT_SYMBOL_GPL(ata_std_probeinit);
4907 EXPORT_SYMBOL_GPL(ata_std_softreset);
4908 EXPORT_SYMBOL_GPL(sata_std_hardreset);
4909 EXPORT_SYMBOL_GPL(ata_std_postreset);
4910 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
4911 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
4912 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
4913 EXPORT_SYMBOL_GPL(ata_port_disable);
4914 EXPORT_SYMBOL_GPL(ata_ratelimit);
4915 EXPORT_SYMBOL_GPL(ata_busy_sleep);
4916 EXPORT_SYMBOL_GPL(ata_port_queue_task);
4917 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
4918 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4919 EXPORT_SYMBOL_GPL(ata_scsi_error);
4920 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
4921 EXPORT_SYMBOL_GPL(ata_scsi_release);
4922 EXPORT_SYMBOL_GPL(ata_host_intr);
4923 EXPORT_SYMBOL_GPL(ata_dev_classify);
4924 EXPORT_SYMBOL_GPL(ata_id_string);
4925 EXPORT_SYMBOL_GPL(ata_id_c_string);
4926 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
4927 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
4928 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
4930 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
4931 EXPORT_SYMBOL_GPL(ata_timing_compute);
4932 EXPORT_SYMBOL_GPL(ata_timing_merge);
4935 EXPORT_SYMBOL_GPL(pci_test_config_bits);
4936 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
4937 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
4938 EXPORT_SYMBOL_GPL(ata_pci_init_one);
4939 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
4940 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
4941 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
4942 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
4943 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
4944 #endif /* CONFIG_PCI */
4946 EXPORT_SYMBOL_GPL(ata_device_suspend);
4947 EXPORT_SYMBOL_GPL(ata_device_resume);
4948 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
4949 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);