2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static void ata_dev_reread_id(struct ata_port *ap, struct ata_device *dev);
65 static void ata_dev_init_params(struct ata_port *ap, struct ata_device *dev);
66 static void ata_set_mode(struct ata_port *ap);
67 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
68 static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift);
69 static int fgb(u32 bitmap);
70 static int ata_choose_xfer_mode(const struct ata_port *ap,
72 unsigned int *xfer_shift_out);
74 static unsigned int ata_unique_id = 1;
75 static struct workqueue_struct *ata_wq;
77 int atapi_enabled = 0;
78 module_param(atapi_enabled, int, 0444);
79 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
81 MODULE_AUTHOR("Jeff Garzik");
82 MODULE_DESCRIPTION("Library module for ATA devices");
83 MODULE_LICENSE("GPL");
84 MODULE_VERSION(DRV_VERSION);
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 : 4;
218 tf->protocol = ATA_PROT_DMA;
222 cmd = ata_rw_cmds[index + fua + lba48 + write];
230 static const char * const xfer_mode_str[] = {
250 * ata_udma_string - convert UDMA bit offset to string
251 * @mask: mask of bits supported; only highest bit counts.
253 * Determine string which represents the highest speed
254 * (highest bit in @udma_mask).
260 * Constant C string representing highest speed listed in
261 * @udma_mask, or the constant C string "<n/a>".
264 static const char *ata_mode_string(unsigned int mask)
268 for (i = 7; i >= 0; i--)
271 for (i = ATA_SHIFT_MWDMA + 2; i >= ATA_SHIFT_MWDMA; i--)
274 for (i = ATA_SHIFT_PIO + 4; i >= ATA_SHIFT_PIO; i--)
281 return xfer_mode_str[i];
285 * ata_pio_devchk - PATA device presence detection
286 * @ap: ATA channel to examine
287 * @device: Device to examine (starting at zero)
289 * This technique was originally described in
290 * Hale Landis's ATADRVR (www.ata-atapi.com), and
291 * later found its way into the ATA/ATAPI spec.
293 * Write a pattern to the ATA shadow registers,
294 * and if a device is present, it will respond by
295 * correctly storing and echoing back the
296 * ATA shadow register contents.
302 static unsigned int ata_pio_devchk(struct ata_port *ap,
305 struct ata_ioports *ioaddr = &ap->ioaddr;
308 ap->ops->dev_select(ap, device);
310 outb(0x55, ioaddr->nsect_addr);
311 outb(0xaa, ioaddr->lbal_addr);
313 outb(0xaa, ioaddr->nsect_addr);
314 outb(0x55, ioaddr->lbal_addr);
316 outb(0x55, ioaddr->nsect_addr);
317 outb(0xaa, ioaddr->lbal_addr);
319 nsect = inb(ioaddr->nsect_addr);
320 lbal = inb(ioaddr->lbal_addr);
322 if ((nsect == 0x55) && (lbal == 0xaa))
323 return 1; /* we found a device */
325 return 0; /* nothing found */
329 * ata_mmio_devchk - PATA device presence detection
330 * @ap: ATA channel to examine
331 * @device: Device to examine (starting at zero)
333 * This technique was originally described in
334 * Hale Landis's ATADRVR (www.ata-atapi.com), and
335 * later found its way into the ATA/ATAPI spec.
337 * Write a pattern to the ATA shadow registers,
338 * and if a device is present, it will respond by
339 * correctly storing and echoing back the
340 * ATA shadow register contents.
346 static unsigned int ata_mmio_devchk(struct ata_port *ap,
349 struct ata_ioports *ioaddr = &ap->ioaddr;
352 ap->ops->dev_select(ap, device);
354 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
355 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
357 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
358 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
360 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
361 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
363 nsect = readb((void __iomem *) ioaddr->nsect_addr);
364 lbal = readb((void __iomem *) ioaddr->lbal_addr);
366 if ((nsect == 0x55) && (lbal == 0xaa))
367 return 1; /* we found a device */
369 return 0; /* nothing found */
373 * ata_devchk - PATA device presence detection
374 * @ap: ATA channel to examine
375 * @device: Device to examine (starting at zero)
377 * Dispatch ATA device presence detection, depending
378 * on whether we are using PIO or MMIO to talk to the
379 * ATA shadow registers.
385 static unsigned int ata_devchk(struct ata_port *ap,
388 if (ap->flags & ATA_FLAG_MMIO)
389 return ata_mmio_devchk(ap, device);
390 return ata_pio_devchk(ap, device);
394 * ata_dev_classify - determine device type based on ATA-spec signature
395 * @tf: ATA taskfile register set for device to be identified
397 * Determine from taskfile register contents whether a device is
398 * ATA or ATAPI, as per "Signature and persistence" section
399 * of ATA/PI spec (volume 1, sect 5.14).
405 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
406 * the event of failure.
409 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
411 /* Apple's open source Darwin code hints that some devices only
412 * put a proper signature into the LBA mid/high registers,
413 * So, we only check those. It's sufficient for uniqueness.
416 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
417 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
418 DPRINTK("found ATA device by sig\n");
422 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
423 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
424 DPRINTK("found ATAPI device by sig\n");
425 return ATA_DEV_ATAPI;
428 DPRINTK("unknown device\n");
429 return ATA_DEV_UNKNOWN;
433 * ata_dev_try_classify - Parse returned ATA device signature
434 * @ap: ATA channel to examine
435 * @device: Device to examine (starting at zero)
436 * @r_err: Value of error register on completion
438 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
439 * an ATA/ATAPI-defined set of values is placed in the ATA
440 * shadow registers, indicating the results of device detection
443 * Select the ATA device, and read the values from the ATA shadow
444 * registers. Then parse according to the Error register value,
445 * and the spec-defined values examined by ata_dev_classify().
451 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
455 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
457 struct ata_taskfile tf;
461 ap->ops->dev_select(ap, device);
463 memset(&tf, 0, sizeof(tf));
465 ap->ops->tf_read(ap, &tf);
470 /* see if device passed diags */
473 else if ((device == 0) && (err == 0x81))
478 /* determine if device is ATA or ATAPI */
479 class = ata_dev_classify(&tf);
481 if (class == ATA_DEV_UNKNOWN)
483 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
489 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
490 * @id: IDENTIFY DEVICE results we will examine
491 * @s: string into which data is output
492 * @ofs: offset into identify device page
493 * @len: length of string to return. must be an even number.
495 * The strings in the IDENTIFY DEVICE page are broken up into
496 * 16-bit chunks. Run through the string, and output each
497 * 8-bit chunk linearly, regardless of platform.
503 void ata_dev_id_string(const u16 *id, unsigned char *s,
504 unsigned int ofs, unsigned int len)
523 * ata_dev_id_c_string - Convert IDENTIFY DEVICE page into C string
524 * @id: IDENTIFY DEVICE results we will examine
525 * @s: string into which data is output
526 * @ofs: offset into identify device page
527 * @len: length of string to return. must be an odd number.
529 * This function is identical to ata_dev_id_string except that it
530 * trims trailing spaces and terminates the resulting string with
531 * null. @len must be actual maximum length (even number) + 1.
536 void ata_dev_id_c_string(const u16 *id, unsigned char *s,
537 unsigned int ofs, unsigned int len)
543 ata_dev_id_string(id, s, ofs, len - 1);
545 p = s + strnlen(s, len - 1);
546 while (p > s && p[-1] == ' ')
552 * ata_noop_dev_select - Select device 0/1 on ATA bus
553 * @ap: ATA channel to manipulate
554 * @device: ATA device (numbered from zero) to select
556 * This function performs no actual function.
558 * May be used as the dev_select() entry in ata_port_operations.
563 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
569 * ata_std_dev_select - Select device 0/1 on ATA bus
570 * @ap: ATA channel to manipulate
571 * @device: ATA device (numbered from zero) to select
573 * Use the method defined in the ATA specification to
574 * make either device 0, or device 1, active on the
575 * ATA channel. Works with both PIO and MMIO.
577 * May be used as the dev_select() entry in ata_port_operations.
583 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
588 tmp = ATA_DEVICE_OBS;
590 tmp = ATA_DEVICE_OBS | ATA_DEV1;
592 if (ap->flags & ATA_FLAG_MMIO) {
593 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
595 outb(tmp, ap->ioaddr.device_addr);
597 ata_pause(ap); /* needed; also flushes, for mmio */
601 * ata_dev_select - Select device 0/1 on ATA bus
602 * @ap: ATA channel to manipulate
603 * @device: ATA device (numbered from zero) to select
604 * @wait: non-zero to wait for Status register BSY bit to clear
605 * @can_sleep: non-zero if context allows sleeping
607 * Use the method defined in the ATA specification to
608 * make either device 0, or device 1, active on the
611 * This is a high-level version of ata_std_dev_select(),
612 * which additionally provides the services of inserting
613 * the proper pauses and status polling, where needed.
619 void ata_dev_select(struct ata_port *ap, unsigned int device,
620 unsigned int wait, unsigned int can_sleep)
622 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
623 ap->id, device, wait);
628 ap->ops->dev_select(ap, device);
631 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
638 * ata_dump_id - IDENTIFY DEVICE info debugging output
639 * @dev: Device whose IDENTIFY DEVICE page we will dump
641 * Dump selected 16-bit words from a detected device's
642 * IDENTIFY PAGE page.
648 static inline void ata_dump_id(const struct ata_device *dev)
650 DPRINTK("49==0x%04x "
660 DPRINTK("80==0x%04x "
670 DPRINTK("88==0x%04x "
677 * Compute the PIO modes available for this device. This is not as
678 * trivial as it seems if we must consider early devices correctly.
680 * FIXME: pre IDE drive timing (do we care ?).
683 static unsigned int ata_pio_modes(const struct ata_device *adev)
687 /* Usual case. Word 53 indicates word 64 is valid */
688 if (adev->id[ATA_ID_FIELD_VALID] & (1 << 1)) {
689 modes = adev->id[ATA_ID_PIO_MODES] & 0x03;
695 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
696 number for the maximum. Turn it into a mask and return it */
697 modes = (2 << ((adev->id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF)) - 1 ;
699 /* But wait.. there's more. Design your standards by committee and
700 you too can get a free iordy field to process. However its the
701 speeds not the modes that are supported... Note drivers using the
702 timing API will get this right anyway */
706 ata_queue_packet_task(struct ata_port *ap)
708 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
709 queue_work(ata_wq, &ap->packet_task);
713 ata_queue_pio_task(struct ata_port *ap)
715 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
716 queue_work(ata_wq, &ap->pio_task);
720 ata_queue_delayed_pio_task(struct ata_port *ap, unsigned long delay)
722 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
723 queue_delayed_work(ata_wq, &ap->pio_task, delay);
727 * ata_flush_pio_tasks - Flush pio_task and packet_task
728 * @ap: the target ata_port
730 * After this function completes, pio_task and packet_task are
731 * guranteed not to be running or scheduled.
734 * Kernel thread context (may sleep)
737 static void ata_flush_pio_tasks(struct ata_port *ap)
744 spin_lock_irqsave(&ap->host_set->lock, flags);
745 ap->flags |= ATA_FLAG_FLUSH_PIO_TASK;
746 spin_unlock_irqrestore(&ap->host_set->lock, flags);
748 DPRINTK("flush #1\n");
749 flush_workqueue(ata_wq);
752 * At this point, if a task is running, it's guaranteed to see
753 * the FLUSH flag; thus, it will never queue pio tasks again.
756 tmp |= cancel_delayed_work(&ap->pio_task);
757 tmp |= cancel_delayed_work(&ap->packet_task);
759 DPRINTK("flush #2\n");
760 flush_workqueue(ata_wq);
763 spin_lock_irqsave(&ap->host_set->lock, flags);
764 ap->flags &= ~ATA_FLAG_FLUSH_PIO_TASK;
765 spin_unlock_irqrestore(&ap->host_set->lock, flags);
770 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
772 struct completion *waiting = qc->private_data;
774 qc->ap->ops->tf_read(qc->ap, &qc->tf);
779 * ata_exec_internal - execute libata internal command
780 * @ap: Port to which the command is sent
781 * @dev: Device to which the command is sent
782 * @tf: Taskfile registers for the command and the result
783 * @dma_dir: Data tranfer direction of the command
784 * @buf: Data buffer of the command
785 * @buflen: Length of data buffer
787 * Executes libata internal command with timeout. @tf contains
788 * command on entry and result on return. Timeout and error
789 * conditions are reported via return value. No recovery action
790 * is taken after a command times out. It's caller's duty to
791 * clean up after timeout.
794 * None. Should be called with kernel context, might sleep.
798 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
799 struct ata_taskfile *tf,
800 int dma_dir, void *buf, unsigned int buflen)
802 u8 command = tf->command;
803 struct ata_queued_cmd *qc;
804 DECLARE_COMPLETION(wait);
806 unsigned int err_mask;
808 spin_lock_irqsave(&ap->host_set->lock, flags);
810 qc = ata_qc_new_init(ap, dev);
814 qc->dma_dir = dma_dir;
815 if (dma_dir != DMA_NONE) {
816 ata_sg_init_one(qc, buf, buflen);
817 qc->nsect = buflen / ATA_SECT_SIZE;
820 qc->private_data = &wait;
821 qc->complete_fn = ata_qc_complete_internal;
823 qc->err_mask = ata_qc_issue(qc);
827 spin_unlock_irqrestore(&ap->host_set->lock, flags);
829 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
830 spin_lock_irqsave(&ap->host_set->lock, flags);
832 /* We're racing with irq here. If we lose, the
833 * following test prevents us from completing the qc
834 * again. If completion irq occurs after here but
835 * before the caller cleans up, it will result in a
836 * spurious interrupt. We can live with that.
838 if (qc->flags & ATA_QCFLAG_ACTIVE) {
839 qc->err_mask = AC_ERR_TIMEOUT;
841 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
845 spin_unlock_irqrestore(&ap->host_set->lock, flags);
849 err_mask = qc->err_mask;
857 * ata_pio_need_iordy - check if iordy needed
860 * Check if the current speed of the device requires IORDY. Used
861 * by various controllers for chip configuration.
864 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
867 int speed = adev->pio_mode - XFER_PIO_0;
874 /* If we have no drive specific rule, then PIO 2 is non IORDY */
876 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
877 pio = adev->id[ATA_ID_EIDE_PIO];
878 /* Is the speed faster than the drive allows non IORDY ? */
880 /* This is cycle times not frequency - watch the logic! */
881 if (pio > 240) /* PIO2 is 240nS per cycle */
890 * ata_dev_identify - obtain IDENTIFY x DEVICE page
891 * @ap: port on which device we wish to probe resides
892 * @device: device bus address, starting at zero
894 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
895 * command, and read back the 512-byte device information page.
896 * The device information page is fed to us via the standard
897 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
898 * using standard PIO-IN paths)
900 * After reading the device information page, we use several
901 * bits of information from it to initialize data structures
902 * that will be used during the lifetime of the ata_device.
903 * Other data from the info page is used to disqualify certain
904 * older ATA devices we do not wish to support.
907 * Inherited from caller. Some functions called by this function
908 * obtain the host_set lock.
911 static void ata_dev_identify(struct ata_port *ap, unsigned int device)
913 struct ata_device *dev = &ap->device[device];
914 unsigned int major_version;
916 unsigned long xfer_modes;
917 unsigned int using_edd;
918 struct ata_taskfile tf;
919 unsigned int err_mask;
922 if (!ata_dev_present(dev)) {
923 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
928 if (ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
933 DPRINTK("ENTER, host %u, dev %u\n", ap->id, device);
935 WARN_ON(dev->class != ATA_DEV_ATA && dev->class != ATA_DEV_ATAPI &&
936 dev->class != ATA_DEV_NONE);
938 ata_dev_select(ap, device, 1, 1); /* select device 0/1 */
941 ata_tf_init(ap, &tf, device);
943 if (dev->class == ATA_DEV_ATA) {
944 tf.command = ATA_CMD_ID_ATA;
945 DPRINTK("do ATA identify\n");
947 tf.command = ATA_CMD_ID_ATAPI;
948 DPRINTK("do ATAPI identify\n");
951 tf.protocol = ATA_PROT_PIO;
953 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
954 dev->id, sizeof(dev->id));
957 if (err_mask & ~AC_ERR_DEV)
961 * arg! EDD works for all test cases, but seems to return
962 * the ATA signature for some ATAPI devices. Until the
963 * reason for this is found and fixed, we fix up the mess
964 * here. If IDENTIFY DEVICE returns command aborted
965 * (as ATAPI devices do), then we issue an
966 * IDENTIFY PACKET DEVICE.
968 * ATA software reset (SRST, the default) does not appear
969 * to have this problem.
971 if ((using_edd) && (dev->class == ATA_DEV_ATA)) {
973 if (err & ATA_ABORTED) {
974 dev->class = ATA_DEV_ATAPI;
981 swap_buf_le16(dev->id, ATA_ID_WORDS);
983 /* print device capabilities */
984 printk(KERN_DEBUG "ata%u: dev %u cfg "
985 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
986 ap->id, device, dev->id[49],
987 dev->id[82], dev->id[83], dev->id[84],
988 dev->id[85], dev->id[86], dev->id[87],
992 * common ATA, ATAPI feature tests
995 /* we require DMA support (bits 8 of word 49) */
996 if (!ata_id_has_dma(dev->id)) {
997 printk(KERN_DEBUG "ata%u: no dma\n", ap->id);
1001 /* quick-n-dirty find max transfer mode; for printk only */
1002 xfer_modes = dev->id[ATA_ID_UDMA_MODES];
1004 xfer_modes = (dev->id[ATA_ID_MWDMA_MODES]) << ATA_SHIFT_MWDMA;
1006 xfer_modes = ata_pio_modes(dev);
1010 /* ATA-specific feature tests */
1011 if (dev->class == ATA_DEV_ATA) {
1012 if (!ata_id_is_ata(dev->id)) /* sanity check */
1015 /* get major version */
1016 tmp = dev->id[ATA_ID_MAJOR_VER];
1017 for (major_version = 14; major_version >= 1; major_version--)
1018 if (tmp & (1 << major_version))
1022 * The exact sequence expected by certain pre-ATA4 drives is:
1025 * INITIALIZE DEVICE PARAMETERS
1027 * Some drives were very specific about that exact sequence.
1029 if (major_version < 4 || (!ata_id_has_lba(dev->id))) {
1030 ata_dev_init_params(ap, dev);
1032 /* current CHS translation info (id[53-58]) might be
1033 * changed. reread the identify device info.
1035 ata_dev_reread_id(ap, dev);
1038 if (ata_id_has_lba(dev->id)) {
1039 dev->flags |= ATA_DFLAG_LBA;
1041 if (ata_id_has_lba48(dev->id)) {
1042 dev->flags |= ATA_DFLAG_LBA48;
1043 dev->n_sectors = ata_id_u64(dev->id, 100);
1045 dev->n_sectors = ata_id_u32(dev->id, 60);
1048 /* print device info to dmesg */
1049 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1052 ata_mode_string(xfer_modes),
1053 (unsigned long long)dev->n_sectors,
1054 dev->flags & ATA_DFLAG_LBA48 ? " LBA48" : " LBA");
1058 /* Default translation */
1059 dev->cylinders = dev->id[1];
1060 dev->heads = dev->id[3];
1061 dev->sectors = dev->id[6];
1062 dev->n_sectors = dev->cylinders * dev->heads * dev->sectors;
1064 if (ata_id_current_chs_valid(dev->id)) {
1065 /* Current CHS translation is valid. */
1066 dev->cylinders = dev->id[54];
1067 dev->heads = dev->id[55];
1068 dev->sectors = dev->id[56];
1070 dev->n_sectors = ata_id_u32(dev->id, 57);
1073 /* print device info to dmesg */
1074 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1077 ata_mode_string(xfer_modes),
1078 (unsigned long long)dev->n_sectors,
1079 (int)dev->cylinders, (int)dev->heads, (int)dev->sectors);
1083 ap->host->max_cmd_len = 16;
1086 /* ATAPI-specific feature tests */
1087 else if (dev->class == ATA_DEV_ATAPI) {
1088 if (ata_id_is_ata(dev->id)) /* sanity check */
1091 rc = atapi_cdb_len(dev->id);
1092 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1093 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1096 ap->cdb_len = (unsigned int) rc;
1097 ap->host->max_cmd_len = (unsigned char) ap->cdb_len;
1099 /* print device info to dmesg */
1100 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1102 ata_mode_string(xfer_modes));
1105 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1109 printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
1112 dev->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1113 DPRINTK("EXIT, err\n");
1117 static inline u8 ata_dev_knobble(const struct ata_port *ap)
1119 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(ap->device->id)));
1123 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1130 void ata_dev_config(struct ata_port *ap, unsigned int i)
1132 /* limit bridge transfers to udma5, 200 sectors */
1133 if (ata_dev_knobble(ap)) {
1134 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1135 ap->id, ap->device->devno);
1136 ap->udma_mask &= ATA_UDMA5;
1137 ap->host->max_sectors = ATA_MAX_SECTORS;
1138 ap->host->hostt->max_sectors = ATA_MAX_SECTORS;
1139 ap->device[i].flags |= ATA_DFLAG_LOCK_SECTORS;
1142 if (ap->ops->dev_config)
1143 ap->ops->dev_config(ap, &ap->device[i]);
1147 * ata_bus_probe - Reset and probe ATA bus
1150 * Master ATA bus probing function. Initiates a hardware-dependent
1151 * bus reset, then attempts to identify any devices found on
1155 * PCI/etc. bus probe sem.
1158 * Zero on success, non-zero on error.
1161 static int ata_bus_probe(struct ata_port *ap)
1163 unsigned int i, found = 0;
1165 if (ap->ops->probe_reset) {
1166 unsigned int classes[ATA_MAX_DEVICES];
1171 rc = ap->ops->probe_reset(ap, classes);
1173 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1174 if (classes[i] == ATA_DEV_UNKNOWN)
1175 classes[i] = ATA_DEV_NONE;
1176 ap->device[i].class = classes[i];
1179 printk(KERN_ERR "ata%u: probe reset failed, "
1180 "disabling port\n", ap->id);
1181 ata_port_disable(ap);
1184 ap->ops->phy_reset(ap);
1186 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1189 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1190 ata_dev_identify(ap, i);
1191 if (ata_dev_present(&ap->device[i])) {
1193 ata_dev_config(ap,i);
1197 if ((!found) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1198 goto err_out_disable;
1201 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1202 goto err_out_disable;
1207 ap->ops->port_disable(ap);
1213 * ata_port_probe - Mark port as enabled
1214 * @ap: Port for which we indicate enablement
1216 * Modify @ap data structure such that the system
1217 * thinks that the entire port is enabled.
1219 * LOCKING: host_set lock, or some other form of
1223 void ata_port_probe(struct ata_port *ap)
1225 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1229 * sata_print_link_status - Print SATA link status
1230 * @ap: SATA port to printk link status about
1232 * This function prints link speed and status of a SATA link.
1237 static void sata_print_link_status(struct ata_port *ap)
1242 if (!ap->ops->scr_read)
1245 sstatus = scr_read(ap, SCR_STATUS);
1247 if (sata_dev_present(ap)) {
1248 tmp = (sstatus >> 4) & 0xf;
1251 else if (tmp & (1 << 1))
1254 speed = "<unknown>";
1255 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1256 ap->id, speed, sstatus);
1258 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1264 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1265 * @ap: SATA port associated with target SATA PHY.
1267 * This function issues commands to standard SATA Sxxx
1268 * PHY registers, to wake up the phy (and device), and
1269 * clear any reset condition.
1272 * PCI/etc. bus probe sem.
1275 void __sata_phy_reset(struct ata_port *ap)
1278 unsigned long timeout = jiffies + (HZ * 5);
1280 if (ap->flags & ATA_FLAG_SATA_RESET) {
1281 /* issue phy wake/reset */
1282 scr_write_flush(ap, SCR_CONTROL, 0x301);
1283 /* Couldn't find anything in SATA I/II specs, but
1284 * AHCI-1.1 10.4.2 says at least 1 ms. */
1287 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1289 /* wait for phy to become ready, if necessary */
1292 sstatus = scr_read(ap, SCR_STATUS);
1293 if ((sstatus & 0xf) != 1)
1295 } while (time_before(jiffies, timeout));
1297 /* print link status */
1298 sata_print_link_status(ap);
1300 /* TODO: phy layer with polling, timeouts, etc. */
1301 if (sata_dev_present(ap))
1304 ata_port_disable(ap);
1306 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1309 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1310 ata_port_disable(ap);
1314 ap->cbl = ATA_CBL_SATA;
1318 * sata_phy_reset - Reset SATA bus.
1319 * @ap: SATA port associated with target SATA PHY.
1321 * This function resets the SATA bus, and then probes
1322 * the bus for devices.
1325 * PCI/etc. bus probe sem.
1328 void sata_phy_reset(struct ata_port *ap)
1330 __sata_phy_reset(ap);
1331 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1337 * ata_port_disable - Disable port.
1338 * @ap: Port to be disabled.
1340 * Modify @ap data structure such that the system
1341 * thinks that the entire port is disabled, and should
1342 * never attempt to probe or communicate with devices
1345 * LOCKING: host_set lock, or some other form of
1349 void ata_port_disable(struct ata_port *ap)
1351 ap->device[0].class = ATA_DEV_NONE;
1352 ap->device[1].class = ATA_DEV_NONE;
1353 ap->flags |= ATA_FLAG_PORT_DISABLED;
1357 * This mode timing computation functionality is ported over from
1358 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1361 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1362 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1363 * for PIO 5, which is a nonstandard extension and UDMA6, which
1364 * is currently supported only by Maxtor drives.
1367 static const struct ata_timing ata_timing[] = {
1369 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1370 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1371 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1372 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1374 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1375 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1376 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1378 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1380 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1381 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1382 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1384 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1385 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1386 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1388 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1389 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1390 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1392 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1393 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1394 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1396 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1401 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1402 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1404 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1406 q->setup = EZ(t->setup * 1000, T);
1407 q->act8b = EZ(t->act8b * 1000, T);
1408 q->rec8b = EZ(t->rec8b * 1000, T);
1409 q->cyc8b = EZ(t->cyc8b * 1000, T);
1410 q->active = EZ(t->active * 1000, T);
1411 q->recover = EZ(t->recover * 1000, T);
1412 q->cycle = EZ(t->cycle * 1000, T);
1413 q->udma = EZ(t->udma * 1000, UT);
1416 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1417 struct ata_timing *m, unsigned int what)
1419 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1420 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1421 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1422 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1423 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1424 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1425 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1426 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1429 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1431 const struct ata_timing *t;
1433 for (t = ata_timing; t->mode != speed; t++)
1434 if (t->mode == 0xFF)
1439 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1440 struct ata_timing *t, int T, int UT)
1442 const struct ata_timing *s;
1443 struct ata_timing p;
1449 if (!(s = ata_timing_find_mode(speed)))
1452 memcpy(t, s, sizeof(*s));
1455 * If the drive is an EIDE drive, it can tell us it needs extended
1456 * PIO/MW_DMA cycle timing.
1459 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1460 memset(&p, 0, sizeof(p));
1461 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1462 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1463 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1464 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1465 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1467 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1471 * Convert the timing to bus clock counts.
1474 ata_timing_quantize(t, t, T, UT);
1477 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1478 * S.M.A.R.T * and some other commands. We have to ensure that the
1479 * DMA cycle timing is slower/equal than the fastest PIO timing.
1482 if (speed > XFER_PIO_4) {
1483 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1484 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1488 * Lengthen active & recovery time so that cycle time is correct.
1491 if (t->act8b + t->rec8b < t->cyc8b) {
1492 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1493 t->rec8b = t->cyc8b - t->act8b;
1496 if (t->active + t->recover < t->cycle) {
1497 t->active += (t->cycle - (t->active + t->recover)) / 2;
1498 t->recover = t->cycle - t->active;
1504 static const struct {
1507 } xfer_mode_classes[] = {
1508 { ATA_SHIFT_UDMA, XFER_UDMA_0 },
1509 { ATA_SHIFT_MWDMA, XFER_MW_DMA_0 },
1510 { ATA_SHIFT_PIO, XFER_PIO_0 },
1513 static u8 base_from_shift(unsigned int shift)
1517 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++)
1518 if (xfer_mode_classes[i].shift == shift)
1519 return xfer_mode_classes[i].base;
1524 static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1529 if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1532 if (dev->xfer_shift == ATA_SHIFT_PIO)
1533 dev->flags |= ATA_DFLAG_PIO;
1535 ata_dev_set_xfermode(ap, dev);
1537 base = base_from_shift(dev->xfer_shift);
1538 ofs = dev->xfer_mode - base;
1539 idx = ofs + dev->xfer_shift;
1540 WARN_ON(idx >= ARRAY_SIZE(xfer_mode_str));
1542 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1543 idx, dev->xfer_shift, (int)dev->xfer_mode, (int)base, ofs);
1545 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1546 ap->id, dev->devno, xfer_mode_str[idx]);
1549 static int ata_host_set_pio(struct ata_port *ap)
1555 mask = ata_get_mode_mask(ap, ATA_SHIFT_PIO);
1558 printk(KERN_WARNING "ata%u: no PIO support\n", ap->id);
1562 base = base_from_shift(ATA_SHIFT_PIO);
1563 xfer_mode = base + x;
1565 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1566 (int)base, (int)xfer_mode, mask, x);
1568 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1569 struct ata_device *dev = &ap->device[i];
1570 if (ata_dev_present(dev)) {
1571 dev->pio_mode = xfer_mode;
1572 dev->xfer_mode = xfer_mode;
1573 dev->xfer_shift = ATA_SHIFT_PIO;
1574 if (ap->ops->set_piomode)
1575 ap->ops->set_piomode(ap, dev);
1582 static void ata_host_set_dma(struct ata_port *ap, u8 xfer_mode,
1583 unsigned int xfer_shift)
1587 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1588 struct ata_device *dev = &ap->device[i];
1589 if (ata_dev_present(dev)) {
1590 dev->dma_mode = xfer_mode;
1591 dev->xfer_mode = xfer_mode;
1592 dev->xfer_shift = xfer_shift;
1593 if (ap->ops->set_dmamode)
1594 ap->ops->set_dmamode(ap, dev);
1600 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1601 * @ap: port on which timings will be programmed
1603 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1606 * PCI/etc. bus probe sem.
1608 static void ata_set_mode(struct ata_port *ap)
1610 unsigned int xfer_shift;
1614 /* step 1: always set host PIO timings */
1615 rc = ata_host_set_pio(ap);
1619 /* step 2: choose the best data xfer mode */
1620 xfer_mode = xfer_shift = 0;
1621 rc = ata_choose_xfer_mode(ap, &xfer_mode, &xfer_shift);
1625 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1626 if (xfer_shift != ATA_SHIFT_PIO)
1627 ata_host_set_dma(ap, xfer_mode, xfer_shift);
1629 /* step 4: update devices' xfer mode */
1630 ata_dev_set_mode(ap, &ap->device[0]);
1631 ata_dev_set_mode(ap, &ap->device[1]);
1633 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1636 if (ap->ops->post_set_mode)
1637 ap->ops->post_set_mode(ap);
1642 ata_port_disable(ap);
1646 * ata_tf_to_host - issue ATA taskfile to host controller
1647 * @ap: port to which command is being issued
1648 * @tf: ATA taskfile register set
1650 * Issues ATA taskfile register set to ATA host controller,
1651 * with proper synchronization with interrupt handler and
1655 * spin_lock_irqsave(host_set lock)
1658 static inline void ata_tf_to_host(struct ata_port *ap,
1659 const struct ata_taskfile *tf)
1661 ap->ops->tf_load(ap, tf);
1662 ap->ops->exec_command(ap, tf);
1666 * ata_busy_sleep - sleep until BSY clears, or timeout
1667 * @ap: port containing status register to be polled
1668 * @tmout_pat: impatience timeout
1669 * @tmout: overall timeout
1671 * Sleep until ATA Status register bit BSY clears,
1672 * or a timeout occurs.
1677 unsigned int ata_busy_sleep (struct ata_port *ap,
1678 unsigned long tmout_pat, unsigned long tmout)
1680 unsigned long timer_start, timeout;
1683 status = ata_busy_wait(ap, ATA_BUSY, 300);
1684 timer_start = jiffies;
1685 timeout = timer_start + tmout_pat;
1686 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1688 status = ata_busy_wait(ap, ATA_BUSY, 3);
1691 if (status & ATA_BUSY)
1692 printk(KERN_WARNING "ata%u is slow to respond, "
1693 "please be patient\n", ap->id);
1695 timeout = timer_start + tmout;
1696 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1698 status = ata_chk_status(ap);
1701 if (status & ATA_BUSY) {
1702 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1703 ap->id, tmout / HZ);
1710 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1712 struct ata_ioports *ioaddr = &ap->ioaddr;
1713 unsigned int dev0 = devmask & (1 << 0);
1714 unsigned int dev1 = devmask & (1 << 1);
1715 unsigned long timeout;
1717 /* if device 0 was found in ata_devchk, wait for its
1721 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1723 /* if device 1 was found in ata_devchk, wait for
1724 * register access, then wait for BSY to clear
1726 timeout = jiffies + ATA_TMOUT_BOOT;
1730 ap->ops->dev_select(ap, 1);
1731 if (ap->flags & ATA_FLAG_MMIO) {
1732 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1733 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1735 nsect = inb(ioaddr->nsect_addr);
1736 lbal = inb(ioaddr->lbal_addr);
1738 if ((nsect == 1) && (lbal == 1))
1740 if (time_after(jiffies, timeout)) {
1744 msleep(50); /* give drive a breather */
1747 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1749 /* is all this really necessary? */
1750 ap->ops->dev_select(ap, 0);
1752 ap->ops->dev_select(ap, 1);
1754 ap->ops->dev_select(ap, 0);
1758 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1759 * @ap: Port to reset and probe
1761 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1762 * probe the bus. Not often used these days.
1765 * PCI/etc. bus probe sem.
1766 * Obtains host_set lock.
1770 static unsigned int ata_bus_edd(struct ata_port *ap)
1772 struct ata_taskfile tf;
1773 unsigned long flags;
1775 /* set up execute-device-diag (bus reset) taskfile */
1776 /* also, take interrupts to a known state (disabled) */
1777 DPRINTK("execute-device-diag\n");
1778 ata_tf_init(ap, &tf, 0);
1780 tf.command = ATA_CMD_EDD;
1781 tf.protocol = ATA_PROT_NODATA;
1784 spin_lock_irqsave(&ap->host_set->lock, flags);
1785 ata_tf_to_host(ap, &tf);
1786 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1788 /* spec says at least 2ms. but who knows with those
1789 * crazy ATAPI devices...
1793 return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1796 static unsigned int ata_bus_softreset(struct ata_port *ap,
1797 unsigned int devmask)
1799 struct ata_ioports *ioaddr = &ap->ioaddr;
1801 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
1803 /* software reset. causes dev0 to be selected */
1804 if (ap->flags & ATA_FLAG_MMIO) {
1805 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1806 udelay(20); /* FIXME: flush */
1807 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
1808 udelay(20); /* FIXME: flush */
1809 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1811 outb(ap->ctl, ioaddr->ctl_addr);
1813 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
1815 outb(ap->ctl, ioaddr->ctl_addr);
1818 /* spec mandates ">= 2ms" before checking status.
1819 * We wait 150ms, because that was the magic delay used for
1820 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1821 * between when the ATA command register is written, and then
1822 * status is checked. Because waiting for "a while" before
1823 * checking status is fine, post SRST, we perform this magic
1824 * delay here as well.
1828 ata_bus_post_reset(ap, devmask);
1834 * ata_bus_reset - reset host port and associated ATA channel
1835 * @ap: port to reset
1837 * This is typically the first time we actually start issuing
1838 * commands to the ATA channel. We wait for BSY to clear, then
1839 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1840 * result. Determine what devices, if any, are on the channel
1841 * by looking at the device 0/1 error register. Look at the signature
1842 * stored in each device's taskfile registers, to determine if
1843 * the device is ATA or ATAPI.
1846 * PCI/etc. bus probe sem.
1847 * Obtains host_set lock.
1850 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1853 void ata_bus_reset(struct ata_port *ap)
1855 struct ata_ioports *ioaddr = &ap->ioaddr;
1856 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
1858 unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
1860 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
1862 /* determine if device 0/1 are present */
1863 if (ap->flags & ATA_FLAG_SATA_RESET)
1866 dev0 = ata_devchk(ap, 0);
1868 dev1 = ata_devchk(ap, 1);
1872 devmask |= (1 << 0);
1874 devmask |= (1 << 1);
1876 /* select device 0 again */
1877 ap->ops->dev_select(ap, 0);
1879 /* issue bus reset */
1880 if (ap->flags & ATA_FLAG_SRST)
1881 rc = ata_bus_softreset(ap, devmask);
1882 else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
1883 /* set up device control */
1884 if (ap->flags & ATA_FLAG_MMIO)
1885 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1887 outb(ap->ctl, ioaddr->ctl_addr);
1888 rc = ata_bus_edd(ap);
1895 * determine by signature whether we have ATA or ATAPI devices
1897 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
1898 if ((slave_possible) && (err != 0x81))
1899 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
1901 /* re-enable interrupts */
1902 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
1905 /* is double-select really necessary? */
1906 if (ap->device[1].class != ATA_DEV_NONE)
1907 ap->ops->dev_select(ap, 1);
1908 if (ap->device[0].class != ATA_DEV_NONE)
1909 ap->ops->dev_select(ap, 0);
1911 /* if no devices were detected, disable this port */
1912 if ((ap->device[0].class == ATA_DEV_NONE) &&
1913 (ap->device[1].class == ATA_DEV_NONE))
1916 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
1917 /* set up device control for ATA_FLAG_SATA_RESET */
1918 if (ap->flags & ATA_FLAG_MMIO)
1919 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1921 outb(ap->ctl, ioaddr->ctl_addr);
1928 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
1929 ap->ops->port_disable(ap);
1934 static int sata_phy_resume(struct ata_port *ap)
1936 unsigned long timeout = jiffies + (HZ * 5);
1939 scr_write_flush(ap, SCR_CONTROL, 0x300);
1941 /* Wait for phy to become ready, if necessary. */
1944 sstatus = scr_read(ap, SCR_STATUS);
1945 if ((sstatus & 0xf) != 1)
1947 } while (time_before(jiffies, timeout));
1953 * ata_std_probeinit - initialize probing
1954 * @ap: port to be probed
1956 * @ap is about to be probed. Initialize it. This function is
1957 * to be used as standard callback for ata_drive_probe_reset().
1959 * NOTE!!! Do not use this function as probeinit if a low level
1960 * driver implements only hardreset. Just pass NULL as probeinit
1961 * in that case. Using this function is probably okay but doing
1962 * so makes reset sequence different from the original
1963 * ->phy_reset implementation and Jeff nervous. :-P
1965 extern void ata_std_probeinit(struct ata_port *ap)
1967 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
1968 sata_phy_resume(ap);
1969 if (sata_dev_present(ap))
1970 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1975 * ata_std_softreset - reset host port via ATA SRST
1976 * @ap: port to reset
1977 * @verbose: fail verbosely
1978 * @classes: resulting classes of attached devices
1980 * Reset host port using ATA SRST. This function is to be used
1981 * as standard callback for ata_drive_*_reset() functions.
1984 * Kernel thread context (may sleep)
1987 * 0 on success, -errno otherwise.
1989 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
1991 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
1992 unsigned int devmask = 0, err_mask;
1997 if (ap->ops->scr_read && !sata_dev_present(ap)) {
1998 classes[0] = ATA_DEV_NONE;
2002 /* determine if device 0/1 are present */
2003 if (ata_devchk(ap, 0))
2004 devmask |= (1 << 0);
2005 if (slave_possible && ata_devchk(ap, 1))
2006 devmask |= (1 << 1);
2008 /* select device 0 again */
2009 ap->ops->dev_select(ap, 0);
2011 /* issue bus reset */
2012 DPRINTK("about to softreset, devmask=%x\n", devmask);
2013 err_mask = ata_bus_softreset(ap, devmask);
2016 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2019 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2024 /* determine by signature whether we have ATA or ATAPI devices */
2025 classes[0] = ata_dev_try_classify(ap, 0, &err);
2026 if (slave_possible && err != 0x81)
2027 classes[1] = ata_dev_try_classify(ap, 1, &err);
2030 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2035 * sata_std_hardreset - reset host port via SATA phy reset
2036 * @ap: port to reset
2037 * @verbose: fail verbosely
2038 * @class: resulting class of attached device
2040 * SATA phy-reset host port using DET bits of SControl register.
2041 * This function is to be used as standard callback for
2042 * ata_drive_*_reset().
2045 * Kernel thread context (may sleep)
2048 * 0 on success, -errno otherwise.
2050 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2054 /* Issue phy wake/reset */
2055 scr_write_flush(ap, SCR_CONTROL, 0x301);
2058 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2059 * 10.4.2 says at least 1 ms.
2063 /* Bring phy back */
2064 sata_phy_resume(ap);
2066 /* TODO: phy layer with polling, timeouts, etc. */
2067 if (!sata_dev_present(ap)) {
2068 *class = ATA_DEV_NONE;
2069 DPRINTK("EXIT, link offline\n");
2073 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2075 printk(KERN_ERR "ata%u: COMRESET failed "
2076 "(device not ready)\n", ap->id);
2078 DPRINTK("EXIT, device not ready\n");
2082 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2084 *class = ata_dev_try_classify(ap, 0, NULL);
2086 DPRINTK("EXIT, class=%u\n", *class);
2091 * ata_std_postreset - standard postreset callback
2092 * @ap: the target ata_port
2093 * @classes: classes of attached devices
2095 * This function is invoked after a successful reset. Note that
2096 * the device might have been reset more than once using
2097 * different reset methods before postreset is invoked.
2098 * postreset is also reponsible for setting cable type.
2100 * This function is to be used as standard callback for
2101 * ata_drive_*_reset().
2104 * Kernel thread context (may sleep)
2106 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2110 /* set cable type */
2111 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2112 ap->cbl = ATA_CBL_SATA;
2114 /* print link status */
2115 if (ap->cbl == ATA_CBL_SATA)
2116 sata_print_link_status(ap);
2118 /* re-enable interrupts */
2119 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2122 /* is double-select really necessary? */
2123 if (classes[0] != ATA_DEV_NONE)
2124 ap->ops->dev_select(ap, 1);
2125 if (classes[1] != ATA_DEV_NONE)
2126 ap->ops->dev_select(ap, 0);
2128 /* bail out if no device is present */
2129 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2130 DPRINTK("EXIT, no device\n");
2134 /* set up device control */
2135 if (ap->ioaddr.ctl_addr) {
2136 if (ap->flags & ATA_FLAG_MMIO)
2137 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2139 outb(ap->ctl, ap->ioaddr.ctl_addr);
2146 * ata_std_probe_reset - standard probe reset method
2147 * @ap: prot to perform probe-reset
2148 * @classes: resulting classes of attached devices
2150 * The stock off-the-shelf ->probe_reset method.
2153 * Kernel thread context (may sleep)
2156 * 0 on success, -errno otherwise.
2158 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2160 ata_reset_fn_t hardreset;
2163 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2164 hardreset = sata_std_hardreset;
2166 return ata_drive_probe_reset(ap, ata_std_probeinit,
2167 ata_std_softreset, hardreset,
2168 ata_std_postreset, classes);
2171 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2172 ata_postreset_fn_t postreset,
2173 unsigned int *classes)
2177 for (i = 0; i < ATA_MAX_DEVICES; i++)
2178 classes[i] = ATA_DEV_UNKNOWN;
2180 rc = reset(ap, 0, classes);
2184 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2185 * is complete and convert all ATA_DEV_UNKNOWN to
2188 for (i = 0; i < ATA_MAX_DEVICES; i++)
2189 if (classes[i] != ATA_DEV_UNKNOWN)
2192 if (i < ATA_MAX_DEVICES)
2193 for (i = 0; i < ATA_MAX_DEVICES; i++)
2194 if (classes[i] == ATA_DEV_UNKNOWN)
2195 classes[i] = ATA_DEV_NONE;
2198 postreset(ap, classes);
2200 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2204 * ata_drive_probe_reset - Perform probe reset with given methods
2205 * @ap: port to reset
2206 * @probeinit: probeinit method (can be NULL)
2207 * @softreset: softreset method (can be NULL)
2208 * @hardreset: hardreset method (can be NULL)
2209 * @postreset: postreset method (can be NULL)
2210 * @classes: resulting classes of attached devices
2212 * Reset the specified port and classify attached devices using
2213 * given methods. This function prefers softreset but tries all
2214 * possible reset sequences to reset and classify devices. This
2215 * function is intended to be used for constructing ->probe_reset
2216 * callback by low level drivers.
2218 * Reset methods should follow the following rules.
2220 * - Return 0 on sucess, -errno on failure.
2221 * - If classification is supported, fill classes[] with
2222 * recognized class codes.
2223 * - If classification is not supported, leave classes[] alone.
2224 * - If verbose is non-zero, print error message on failure;
2225 * otherwise, shut up.
2228 * Kernel thread context (may sleep)
2231 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2232 * if classification fails, and any error code from reset
2235 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2236 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2237 ata_postreset_fn_t postreset, unsigned int *classes)
2245 rc = do_probe_reset(ap, softreset, postreset, classes);
2253 rc = do_probe_reset(ap, hardreset, postreset, classes);
2254 if (rc == 0 || rc != -ENODEV)
2258 rc = do_probe_reset(ap, softreset, postreset, classes);
2263 static void ata_pr_blacklisted(const struct ata_port *ap,
2264 const struct ata_device *dev)
2266 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2267 ap->id, dev->devno);
2270 static const char * const ata_dma_blacklist [] = {
2289 "Toshiba CD-ROM XM-6202B",
2290 "TOSHIBA CD-ROM XM-1702BC",
2292 "E-IDE CD-ROM CR-840",
2295 "SAMSUNG CD-ROM SC-148C",
2296 "SAMSUNG CD-ROM SC",
2298 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2302 static int ata_dma_blacklisted(const struct ata_device *dev)
2304 unsigned char model_num[41];
2307 ata_dev_id_c_string(dev->id, model_num, ATA_ID_PROD_OFS,
2310 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i++)
2311 if (!strcmp(ata_dma_blacklist[i], model_num))
2317 static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift)
2319 const struct ata_device *master, *slave;
2322 master = &ap->device[0];
2323 slave = &ap->device[1];
2325 WARN_ON(!ata_dev_present(master) && !ata_dev_present(slave));
2327 if (shift == ATA_SHIFT_UDMA) {
2328 mask = ap->udma_mask;
2329 if (ata_dev_present(master)) {
2330 mask &= (master->id[ATA_ID_UDMA_MODES] & 0xff);
2331 if (ata_dma_blacklisted(master)) {
2333 ata_pr_blacklisted(ap, master);
2336 if (ata_dev_present(slave)) {
2337 mask &= (slave->id[ATA_ID_UDMA_MODES] & 0xff);
2338 if (ata_dma_blacklisted(slave)) {
2340 ata_pr_blacklisted(ap, slave);
2344 else if (shift == ATA_SHIFT_MWDMA) {
2345 mask = ap->mwdma_mask;
2346 if (ata_dev_present(master)) {
2347 mask &= (master->id[ATA_ID_MWDMA_MODES] & 0x07);
2348 if (ata_dma_blacklisted(master)) {
2350 ata_pr_blacklisted(ap, master);
2353 if (ata_dev_present(slave)) {
2354 mask &= (slave->id[ATA_ID_MWDMA_MODES] & 0x07);
2355 if (ata_dma_blacklisted(slave)) {
2357 ata_pr_blacklisted(ap, slave);
2361 else if (shift == ATA_SHIFT_PIO) {
2362 mask = ap->pio_mask;
2363 if (ata_dev_present(master)) {
2364 /* spec doesn't return explicit support for
2365 * PIO0-2, so we fake it
2367 u16 tmp_mode = master->id[ATA_ID_PIO_MODES] & 0x03;
2372 if (ata_dev_present(slave)) {
2373 /* spec doesn't return explicit support for
2374 * PIO0-2, so we fake it
2376 u16 tmp_mode = slave->id[ATA_ID_PIO_MODES] & 0x03;
2383 mask = 0xffffffff; /* shut up compiler warning */
2390 /* find greatest bit */
2391 static int fgb(u32 bitmap)
2396 for (i = 0; i < 32; i++)
2397 if (bitmap & (1 << i))
2404 * ata_choose_xfer_mode - attempt to find best transfer mode
2405 * @ap: Port for which an xfer mode will be selected
2406 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2407 * @xfer_shift_out: (output) bit shift that selects this mode
2409 * Based on host and device capabilities, determine the
2410 * maximum transfer mode that is amenable to all.
2413 * PCI/etc. bus probe sem.
2416 * Zero on success, negative on error.
2419 static int ata_choose_xfer_mode(const struct ata_port *ap,
2421 unsigned int *xfer_shift_out)
2423 unsigned int mask, shift;
2426 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++) {
2427 shift = xfer_mode_classes[i].shift;
2428 mask = ata_get_mode_mask(ap, shift);
2432 *xfer_mode_out = xfer_mode_classes[i].base + x;
2433 *xfer_shift_out = shift;
2442 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2443 * @ap: Port associated with device @dev
2444 * @dev: Device to which command will be sent
2446 * Issue SET FEATURES - XFER MODE command to device @dev
2450 * PCI/etc. bus probe sem.
2453 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
2455 struct ata_taskfile tf;
2457 /* set up set-features taskfile */
2458 DPRINTK("set features - xfer mode\n");
2460 ata_tf_init(ap, &tf, dev->devno);
2461 tf.command = ATA_CMD_SET_FEATURES;
2462 tf.feature = SETFEATURES_XFER;
2463 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2464 tf.protocol = ATA_PROT_NODATA;
2465 tf.nsect = dev->xfer_mode;
2467 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2468 printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
2470 ata_port_disable(ap);
2477 * ata_dev_reread_id - Reread the device identify device info
2478 * @ap: port where the device is
2479 * @dev: device to reread the identify device info
2484 static void ata_dev_reread_id(struct ata_port *ap, struct ata_device *dev)
2486 struct ata_taskfile tf;
2488 ata_tf_init(ap, &tf, dev->devno);
2490 if (dev->class == ATA_DEV_ATA) {
2491 tf.command = ATA_CMD_ID_ATA;
2492 DPRINTK("do ATA identify\n");
2494 tf.command = ATA_CMD_ID_ATAPI;
2495 DPRINTK("do ATAPI identify\n");
2498 tf.flags |= ATA_TFLAG_DEVICE;
2499 tf.protocol = ATA_PROT_PIO;
2501 if (ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
2502 dev->id, sizeof(dev->id)))
2505 swap_buf_le16(dev->id, ATA_ID_WORDS);
2513 printk(KERN_ERR "ata%u: failed to reread ID, disabled\n", ap->id);
2514 ata_port_disable(ap);
2518 * ata_dev_init_params - Issue INIT DEV PARAMS command
2519 * @ap: Port associated with device @dev
2520 * @dev: Device to which command will be sent
2525 static void ata_dev_init_params(struct ata_port *ap, struct ata_device *dev)
2527 struct ata_taskfile tf;
2528 u16 sectors = dev->id[6];
2529 u16 heads = dev->id[3];
2531 /* Number of sectors per track 1-255. Number of heads 1-16 */
2532 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2535 /* set up init dev params taskfile */
2536 DPRINTK("init dev params \n");
2538 ata_tf_init(ap, &tf, dev->devno);
2539 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2540 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2541 tf.protocol = ATA_PROT_NODATA;
2543 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2545 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2546 printk(KERN_ERR "ata%u: failed to init parameters, disabled\n",
2548 ata_port_disable(ap);
2555 * ata_sg_clean - Unmap DMA memory associated with command
2556 * @qc: Command containing DMA memory to be released
2558 * Unmap all mapped DMA memory associated with this command.
2561 * spin_lock_irqsave(host_set lock)
2564 static void ata_sg_clean(struct ata_queued_cmd *qc)
2566 struct ata_port *ap = qc->ap;
2567 struct scatterlist *sg = qc->__sg;
2568 int dir = qc->dma_dir;
2569 void *pad_buf = NULL;
2571 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2572 WARN_ON(sg == NULL);
2574 if (qc->flags & ATA_QCFLAG_SINGLE)
2575 WARN_ON(qc->n_elem != 1);
2577 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2579 /* if we padded the buffer out to 32-bit bound, and data
2580 * xfer direction is from-device, we must copy from the
2581 * pad buffer back into the supplied buffer
2583 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2584 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2586 if (qc->flags & ATA_QCFLAG_SG) {
2588 dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
2589 /* restore last sg */
2590 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2592 struct scatterlist *psg = &qc->pad_sgent;
2593 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2594 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2595 kunmap_atomic(addr, KM_IRQ0);
2598 if (sg_dma_len(&sg[0]) > 0)
2599 dma_unmap_single(ap->host_set->dev,
2600 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2603 sg->length += qc->pad_len;
2605 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2606 pad_buf, qc->pad_len);
2609 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2614 * ata_fill_sg - Fill PCI IDE PRD table
2615 * @qc: Metadata associated with taskfile to be transferred
2617 * Fill PCI IDE PRD (scatter-gather) table with segments
2618 * associated with the current disk command.
2621 * spin_lock_irqsave(host_set lock)
2624 static void ata_fill_sg(struct ata_queued_cmd *qc)
2626 struct ata_port *ap = qc->ap;
2627 struct scatterlist *sg;
2630 WARN_ON(qc->__sg == NULL);
2631 WARN_ON(qc->n_elem == 0);
2634 ata_for_each_sg(sg, qc) {
2638 /* determine if physical DMA addr spans 64K boundary.
2639 * Note h/w doesn't support 64-bit, so we unconditionally
2640 * truncate dma_addr_t to u32.
2642 addr = (u32) sg_dma_address(sg);
2643 sg_len = sg_dma_len(sg);
2646 offset = addr & 0xffff;
2648 if ((offset + sg_len) > 0x10000)
2649 len = 0x10000 - offset;
2651 ap->prd[idx].addr = cpu_to_le32(addr);
2652 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2653 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2662 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2665 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2666 * @qc: Metadata associated with taskfile to check
2668 * Allow low-level driver to filter ATA PACKET commands, returning
2669 * a status indicating whether or not it is OK to use DMA for the
2670 * supplied PACKET command.
2673 * spin_lock_irqsave(host_set lock)
2675 * RETURNS: 0 when ATAPI DMA can be used
2678 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2680 struct ata_port *ap = qc->ap;
2681 int rc = 0; /* Assume ATAPI DMA is OK by default */
2683 if (ap->ops->check_atapi_dma)
2684 rc = ap->ops->check_atapi_dma(qc);
2689 * ata_qc_prep - Prepare taskfile for submission
2690 * @qc: Metadata associated with taskfile to be prepared
2692 * Prepare ATA taskfile for submission.
2695 * spin_lock_irqsave(host_set lock)
2697 void ata_qc_prep(struct ata_queued_cmd *qc)
2699 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2706 * ata_sg_init_one - Associate command with memory buffer
2707 * @qc: Command to be associated
2708 * @buf: Memory buffer
2709 * @buflen: Length of memory buffer, in bytes.
2711 * Initialize the data-related elements of queued_cmd @qc
2712 * to point to a single memory buffer, @buf of byte length @buflen.
2715 * spin_lock_irqsave(host_set lock)
2718 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2720 struct scatterlist *sg;
2722 qc->flags |= ATA_QCFLAG_SINGLE;
2724 memset(&qc->sgent, 0, sizeof(qc->sgent));
2725 qc->__sg = &qc->sgent;
2727 qc->orig_n_elem = 1;
2731 sg_init_one(sg, buf, buflen);
2735 * ata_sg_init - Associate command with scatter-gather table.
2736 * @qc: Command to be associated
2737 * @sg: Scatter-gather table.
2738 * @n_elem: Number of elements in s/g table.
2740 * Initialize the data-related elements of queued_cmd @qc
2741 * to point to a scatter-gather table @sg, containing @n_elem
2745 * spin_lock_irqsave(host_set lock)
2748 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2749 unsigned int n_elem)
2751 qc->flags |= ATA_QCFLAG_SG;
2753 qc->n_elem = n_elem;
2754 qc->orig_n_elem = n_elem;
2758 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2759 * @qc: Command with memory buffer to be mapped.
2761 * DMA-map the memory buffer associated with queued_cmd @qc.
2764 * spin_lock_irqsave(host_set lock)
2767 * Zero on success, negative on error.
2770 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
2772 struct ata_port *ap = qc->ap;
2773 int dir = qc->dma_dir;
2774 struct scatterlist *sg = qc->__sg;
2775 dma_addr_t dma_address;
2777 /* we must lengthen transfers to end on a 32-bit boundary */
2778 qc->pad_len = sg->length & 3;
2780 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2781 struct scatterlist *psg = &qc->pad_sgent;
2783 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2785 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2787 if (qc->tf.flags & ATA_TFLAG_WRITE)
2788 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
2791 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2792 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2794 sg->length -= qc->pad_len;
2796 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2797 sg->length, qc->pad_len);
2801 sg_dma_address(sg) = 0;
2805 dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
2807 if (dma_mapping_error(dma_address)) {
2809 sg->length += qc->pad_len;
2813 sg_dma_address(sg) = dma_address;
2815 sg_dma_len(sg) = sg->length;
2817 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
2818 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
2824 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2825 * @qc: Command with scatter-gather table to be mapped.
2827 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2830 * spin_lock_irqsave(host_set lock)
2833 * Zero on success, negative on error.
2837 static int ata_sg_setup(struct ata_queued_cmd *qc)
2839 struct ata_port *ap = qc->ap;
2840 struct scatterlist *sg = qc->__sg;
2841 struct scatterlist *lsg = &sg[qc->n_elem - 1];
2842 int n_elem, pre_n_elem, dir, trim_sg = 0;
2844 VPRINTK("ENTER, ata%u\n", ap->id);
2845 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
2847 /* we must lengthen transfers to end on a 32-bit boundary */
2848 qc->pad_len = lsg->length & 3;
2850 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2851 struct scatterlist *psg = &qc->pad_sgent;
2852 unsigned int offset;
2854 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2856 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2859 * psg->page/offset are used to copy to-be-written
2860 * data in this function or read data in ata_sg_clean.
2862 offset = lsg->offset + lsg->length - qc->pad_len;
2863 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
2864 psg->offset = offset_in_page(offset);
2866 if (qc->tf.flags & ATA_TFLAG_WRITE) {
2867 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2868 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
2869 kunmap_atomic(addr, KM_IRQ0);
2872 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2873 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2875 lsg->length -= qc->pad_len;
2876 if (lsg->length == 0)
2879 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2880 qc->n_elem - 1, lsg->length, qc->pad_len);
2883 pre_n_elem = qc->n_elem;
2884 if (trim_sg && pre_n_elem)
2893 n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
2895 /* restore last sg */
2896 lsg->length += qc->pad_len;
2900 DPRINTK("%d sg elements mapped\n", n_elem);
2903 qc->n_elem = n_elem;
2909 * ata_poll_qc_complete - turn irq back on and finish qc
2910 * @qc: Command to complete
2911 * @err_mask: ATA status register content
2914 * None. (grabs host lock)
2917 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
2919 struct ata_port *ap = qc->ap;
2920 unsigned long flags;
2922 spin_lock_irqsave(&ap->host_set->lock, flags);
2923 ap->flags &= ~ATA_FLAG_NOINTR;
2925 ata_qc_complete(qc);
2926 spin_unlock_irqrestore(&ap->host_set->lock, flags);
2930 * ata_pio_poll - poll using PIO, depending on current state
2931 * @ap: the target ata_port
2934 * None. (executing in kernel thread context)
2937 * timeout value to use
2940 static unsigned long ata_pio_poll(struct ata_port *ap)
2942 struct ata_queued_cmd *qc;
2944 unsigned int poll_state = HSM_ST_UNKNOWN;
2945 unsigned int reg_state = HSM_ST_UNKNOWN;
2947 qc = ata_qc_from_tag(ap, ap->active_tag);
2948 WARN_ON(qc == NULL);
2950 switch (ap->hsm_task_state) {
2953 poll_state = HSM_ST_POLL;
2957 case HSM_ST_LAST_POLL:
2958 poll_state = HSM_ST_LAST_POLL;
2959 reg_state = HSM_ST_LAST;
2966 status = ata_chk_status(ap);
2967 if (status & ATA_BUSY) {
2968 if (time_after(jiffies, ap->pio_task_timeout)) {
2969 qc->err_mask |= AC_ERR_TIMEOUT;
2970 ap->hsm_task_state = HSM_ST_TMOUT;
2973 ap->hsm_task_state = poll_state;
2974 return ATA_SHORT_PAUSE;
2977 ap->hsm_task_state = reg_state;
2982 * ata_pio_complete - check if drive is busy or idle
2983 * @ap: the target ata_port
2986 * None. (executing in kernel thread context)
2989 * Non-zero if qc completed, zero otherwise.
2992 static int ata_pio_complete (struct ata_port *ap)
2994 struct ata_queued_cmd *qc;
2998 * This is purely heuristic. This is a fast path. Sometimes when
2999 * we enter, BSY will be cleared in a chk-status or two. If not,
3000 * the drive is probably seeking or something. Snooze for a couple
3001 * msecs, then chk-status again. If still busy, fall back to
3002 * HSM_ST_POLL state.
3004 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3005 if (drv_stat & ATA_BUSY) {
3007 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3008 if (drv_stat & ATA_BUSY) {
3009 ap->hsm_task_state = HSM_ST_LAST_POLL;
3010 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3015 qc = ata_qc_from_tag(ap, ap->active_tag);
3016 WARN_ON(qc == NULL);
3018 drv_stat = ata_wait_idle(ap);
3019 if (!ata_ok(drv_stat)) {
3020 qc->err_mask |= __ac_err_mask(drv_stat);
3021 ap->hsm_task_state = HSM_ST_ERR;
3025 ap->hsm_task_state = HSM_ST_IDLE;
3027 WARN_ON(qc->err_mask);
3028 ata_poll_qc_complete(qc);
3030 /* another command may start at this point */
3037 * swap_buf_le16 - swap halves of 16-bit words in place
3038 * @buf: Buffer to swap
3039 * @buf_words: Number of 16-bit words in buffer.
3041 * Swap halves of 16-bit words if needed to convert from
3042 * little-endian byte order to native cpu byte order, or
3046 * Inherited from caller.
3048 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3053 for (i = 0; i < buf_words; i++)
3054 buf[i] = le16_to_cpu(buf[i]);
3055 #endif /* __BIG_ENDIAN */
3059 * ata_mmio_data_xfer - Transfer data by MMIO
3060 * @ap: port to read/write
3062 * @buflen: buffer length
3063 * @write_data: read/write
3065 * Transfer data from/to the device data register by MMIO.
3068 * Inherited from caller.
3071 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3072 unsigned int buflen, int write_data)
3075 unsigned int words = buflen >> 1;
3076 u16 *buf16 = (u16 *) buf;
3077 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3079 /* Transfer multiple of 2 bytes */
3081 for (i = 0; i < words; i++)
3082 writew(le16_to_cpu(buf16[i]), mmio);
3084 for (i = 0; i < words; i++)
3085 buf16[i] = cpu_to_le16(readw(mmio));
3088 /* Transfer trailing 1 byte, if any. */
3089 if (unlikely(buflen & 0x01)) {
3090 u16 align_buf[1] = { 0 };
3091 unsigned char *trailing_buf = buf + buflen - 1;
3094 memcpy(align_buf, trailing_buf, 1);
3095 writew(le16_to_cpu(align_buf[0]), mmio);
3097 align_buf[0] = cpu_to_le16(readw(mmio));
3098 memcpy(trailing_buf, align_buf, 1);
3104 * ata_pio_data_xfer - Transfer data by PIO
3105 * @ap: port to read/write
3107 * @buflen: buffer length
3108 * @write_data: read/write
3110 * Transfer data from/to the device data register by PIO.
3113 * Inherited from caller.
3116 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3117 unsigned int buflen, int write_data)
3119 unsigned int words = buflen >> 1;
3121 /* Transfer multiple of 2 bytes */
3123 outsw(ap->ioaddr.data_addr, buf, words);
3125 insw(ap->ioaddr.data_addr, buf, words);
3127 /* Transfer trailing 1 byte, if any. */
3128 if (unlikely(buflen & 0x01)) {
3129 u16 align_buf[1] = { 0 };
3130 unsigned char *trailing_buf = buf + buflen - 1;
3133 memcpy(align_buf, trailing_buf, 1);
3134 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3136 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3137 memcpy(trailing_buf, align_buf, 1);
3143 * ata_data_xfer - Transfer data from/to the data register.
3144 * @ap: port to read/write
3146 * @buflen: buffer length
3147 * @do_write: read/write
3149 * Transfer data from/to the device data register.
3152 * Inherited from caller.
3155 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3156 unsigned int buflen, int do_write)
3158 /* Make the crap hardware pay the costs not the good stuff */
3159 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3160 unsigned long flags;
3161 local_irq_save(flags);
3162 if (ap->flags & ATA_FLAG_MMIO)
3163 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3165 ata_pio_data_xfer(ap, buf, buflen, do_write);
3166 local_irq_restore(flags);
3168 if (ap->flags & ATA_FLAG_MMIO)
3169 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3171 ata_pio_data_xfer(ap, buf, buflen, do_write);
3176 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3177 * @qc: Command on going
3179 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3182 * Inherited from caller.
3185 static void ata_pio_sector(struct ata_queued_cmd *qc)
3187 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3188 struct scatterlist *sg = qc->__sg;
3189 struct ata_port *ap = qc->ap;
3191 unsigned int offset;
3194 if (qc->cursect == (qc->nsect - 1))
3195 ap->hsm_task_state = HSM_ST_LAST;
3197 page = sg[qc->cursg].page;
3198 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3200 /* get the current page and offset */
3201 page = nth_page(page, (offset >> PAGE_SHIFT));
3202 offset %= PAGE_SIZE;
3204 buf = kmap(page) + offset;
3209 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3214 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3216 /* do the actual data transfer */
3217 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3218 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3224 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3225 * @qc: Command on going
3226 * @bytes: number of bytes
3228 * Transfer Transfer data from/to the ATAPI device.
3231 * Inherited from caller.
3235 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3237 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3238 struct scatterlist *sg = qc->__sg;
3239 struct ata_port *ap = qc->ap;
3242 unsigned int offset, count;
3244 if (qc->curbytes + bytes >= qc->nbytes)
3245 ap->hsm_task_state = HSM_ST_LAST;
3248 if (unlikely(qc->cursg >= qc->n_elem)) {
3250 * The end of qc->sg is reached and the device expects
3251 * more data to transfer. In order not to overrun qc->sg
3252 * and fulfill length specified in the byte count register,
3253 * - for read case, discard trailing data from the device
3254 * - for write case, padding zero data to the device
3256 u16 pad_buf[1] = { 0 };
3257 unsigned int words = bytes >> 1;
3260 if (words) /* warning if bytes > 1 */
3261 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3264 for (i = 0; i < words; i++)
3265 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3267 ap->hsm_task_state = HSM_ST_LAST;
3271 sg = &qc->__sg[qc->cursg];
3274 offset = sg->offset + qc->cursg_ofs;
3276 /* get the current page and offset */
3277 page = nth_page(page, (offset >> PAGE_SHIFT));
3278 offset %= PAGE_SIZE;
3280 /* don't overrun current sg */
3281 count = min(sg->length - qc->cursg_ofs, bytes);
3283 /* don't cross page boundaries */
3284 count = min(count, (unsigned int)PAGE_SIZE - offset);
3286 buf = kmap(page) + offset;
3289 qc->curbytes += count;
3290 qc->cursg_ofs += count;
3292 if (qc->cursg_ofs == sg->length) {
3297 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3299 /* do the actual data transfer */
3300 ata_data_xfer(ap, buf, count, do_write);
3309 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3310 * @qc: Command on going
3312 * Transfer Transfer data from/to the ATAPI device.
3315 * Inherited from caller.
3318 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3320 struct ata_port *ap = qc->ap;
3321 struct ata_device *dev = qc->dev;
3322 unsigned int ireason, bc_lo, bc_hi, bytes;
3323 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3325 ap->ops->tf_read(ap, &qc->tf);
3326 ireason = qc->tf.nsect;
3327 bc_lo = qc->tf.lbam;
3328 bc_hi = qc->tf.lbah;
3329 bytes = (bc_hi << 8) | bc_lo;
3331 /* shall be cleared to zero, indicating xfer of data */
3332 if (ireason & (1 << 0))
3335 /* make sure transfer direction matches expected */
3336 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3337 if (do_write != i_write)
3340 __atapi_pio_bytes(qc, bytes);
3345 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3346 ap->id, dev->devno);
3347 qc->err_mask |= AC_ERR_HSM;
3348 ap->hsm_task_state = HSM_ST_ERR;
3352 * ata_pio_block - start PIO on a block
3353 * @ap: the target ata_port
3356 * None. (executing in kernel thread context)
3359 static void ata_pio_block(struct ata_port *ap)
3361 struct ata_queued_cmd *qc;
3365 * This is purely heuristic. This is a fast path.
3366 * Sometimes when we enter, BSY will be cleared in
3367 * a chk-status or two. If not, the drive is probably seeking
3368 * or something. Snooze for a couple msecs, then
3369 * chk-status again. If still busy, fall back to
3370 * HSM_ST_POLL state.
3372 status = ata_busy_wait(ap, ATA_BUSY, 5);
3373 if (status & ATA_BUSY) {
3375 status = ata_busy_wait(ap, ATA_BUSY, 10);
3376 if (status & ATA_BUSY) {
3377 ap->hsm_task_state = HSM_ST_POLL;
3378 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3383 qc = ata_qc_from_tag(ap, ap->active_tag);
3384 WARN_ON(qc == NULL);
3387 if (status & (ATA_ERR | ATA_DF)) {
3388 qc->err_mask |= AC_ERR_DEV;
3389 ap->hsm_task_state = HSM_ST_ERR;
3393 /* transfer data if any */
3394 if (is_atapi_taskfile(&qc->tf)) {
3395 /* DRQ=0 means no more data to transfer */
3396 if ((status & ATA_DRQ) == 0) {
3397 ap->hsm_task_state = HSM_ST_LAST;
3401 atapi_pio_bytes(qc);
3403 /* handle BSY=0, DRQ=0 as error */
3404 if ((status & ATA_DRQ) == 0) {
3405 qc->err_mask |= AC_ERR_HSM;
3406 ap->hsm_task_state = HSM_ST_ERR;
3414 static void ata_pio_error(struct ata_port *ap)
3416 struct ata_queued_cmd *qc;
3418 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3420 qc = ata_qc_from_tag(ap, ap->active_tag);
3421 WARN_ON(qc == NULL);
3423 /* make sure qc->err_mask is available to
3424 * know what's wrong and recover
3426 WARN_ON(qc->err_mask == 0);
3428 ap->hsm_task_state = HSM_ST_IDLE;
3430 ata_poll_qc_complete(qc);
3433 static void ata_pio_task(void *_data)
3435 struct ata_port *ap = _data;
3436 unsigned long timeout;
3443 switch (ap->hsm_task_state) {
3452 qc_completed = ata_pio_complete(ap);
3456 case HSM_ST_LAST_POLL:
3457 timeout = ata_pio_poll(ap);
3467 ata_queue_delayed_pio_task(ap, timeout);
3468 else if (!qc_completed)
3473 * ata_qc_timeout - Handle timeout of queued command
3474 * @qc: Command that timed out
3476 * Some part of the kernel (currently, only the SCSI layer)
3477 * has noticed that the active command on port @ap has not
3478 * completed after a specified length of time. Handle this
3479 * condition by disabling DMA (if necessary) and completing
3480 * transactions, with error if necessary.
3482 * This also handles the case of the "lost interrupt", where
3483 * for some reason (possibly hardware bug, possibly driver bug)
3484 * an interrupt was not delivered to the driver, even though the
3485 * transaction completed successfully.
3488 * Inherited from SCSI layer (none, can sleep)
3491 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3493 struct ata_port *ap = qc->ap;
3494 struct ata_host_set *host_set = ap->host_set;
3495 u8 host_stat = 0, drv_stat;
3496 unsigned long flags;
3500 ata_flush_pio_tasks(ap);
3501 ap->hsm_task_state = HSM_ST_IDLE;
3503 spin_lock_irqsave(&host_set->lock, flags);
3505 switch (qc->tf.protocol) {
3508 case ATA_PROT_ATAPI_DMA:
3509 host_stat = ap->ops->bmdma_status(ap);
3511 /* before we do anything else, clear DMA-Start bit */
3512 ap->ops->bmdma_stop(qc);
3518 drv_stat = ata_chk_status(ap);
3520 /* ack bmdma irq events */
3521 ap->ops->irq_clear(ap);
3523 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3524 ap->id, qc->tf.command, drv_stat, host_stat);
3526 /* complete taskfile transaction */
3527 qc->err_mask |= ac_err_mask(drv_stat);
3531 spin_unlock_irqrestore(&host_set->lock, flags);
3533 ata_eh_qc_complete(qc);
3539 * ata_eng_timeout - Handle timeout of queued command
3540 * @ap: Port on which timed-out command is active
3542 * Some part of the kernel (currently, only the SCSI layer)
3543 * has noticed that the active command on port @ap has not
3544 * completed after a specified length of time. Handle this
3545 * condition by disabling DMA (if necessary) and completing
3546 * transactions, with error if necessary.
3548 * This also handles the case of the "lost interrupt", where
3549 * for some reason (possibly hardware bug, possibly driver bug)
3550 * an interrupt was not delivered to the driver, even though the
3551 * transaction completed successfully.
3554 * Inherited from SCSI layer (none, can sleep)
3557 void ata_eng_timeout(struct ata_port *ap)
3561 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3567 * ata_qc_new - Request an available ATA command, for queueing
3568 * @ap: Port associated with device @dev
3569 * @dev: Device from whom we request an available command structure
3575 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3577 struct ata_queued_cmd *qc = NULL;
3580 for (i = 0; i < ATA_MAX_QUEUE; i++)
3581 if (!test_and_set_bit(i, &ap->qactive)) {
3582 qc = ata_qc_from_tag(ap, i);
3593 * ata_qc_new_init - Request an available ATA command, and initialize it
3594 * @ap: Port associated with device @dev
3595 * @dev: Device from whom we request an available command structure
3601 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3602 struct ata_device *dev)
3604 struct ata_queued_cmd *qc;
3606 qc = ata_qc_new(ap);
3619 * ata_qc_free - free unused ata_queued_cmd
3620 * @qc: Command to complete
3622 * Designed to free unused ata_queued_cmd object
3623 * in case something prevents using it.
3626 * spin_lock_irqsave(host_set lock)
3628 void ata_qc_free(struct ata_queued_cmd *qc)
3630 struct ata_port *ap = qc->ap;
3633 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3637 if (likely(ata_tag_valid(tag))) {
3638 if (tag == ap->active_tag)
3639 ap->active_tag = ATA_TAG_POISON;
3640 qc->tag = ATA_TAG_POISON;
3641 clear_bit(tag, &ap->qactive);
3645 void __ata_qc_complete(struct ata_queued_cmd *qc)
3647 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3648 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3650 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3653 /* atapi: mark qc as inactive to prevent the interrupt handler
3654 * from completing the command twice later, before the error handler
3655 * is called. (when rc != 0 and atapi request sense is needed)
3657 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3659 /* call completion callback */
3660 qc->complete_fn(qc);
3663 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3665 struct ata_port *ap = qc->ap;
3667 switch (qc->tf.protocol) {
3669 case ATA_PROT_ATAPI_DMA:
3672 case ATA_PROT_ATAPI:
3674 case ATA_PROT_PIO_MULT:
3675 if (ap->flags & ATA_FLAG_PIO_DMA)
3688 * ata_qc_issue - issue taskfile to device
3689 * @qc: command to issue to device
3691 * Prepare an ATA command to submission to device.
3692 * This includes mapping the data into a DMA-able
3693 * area, filling in the S/G table, and finally
3694 * writing the taskfile to hardware, starting the command.
3697 * spin_lock_irqsave(host_set lock)
3700 * Zero on success, AC_ERR_* mask on failure
3703 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
3705 struct ata_port *ap = qc->ap;
3707 if (ata_should_dma_map(qc)) {
3708 if (qc->flags & ATA_QCFLAG_SG) {
3709 if (ata_sg_setup(qc))
3711 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
3712 if (ata_sg_setup_one(qc))
3716 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3719 ap->ops->qc_prep(qc);
3721 qc->ap->active_tag = qc->tag;
3722 qc->flags |= ATA_QCFLAG_ACTIVE;
3724 return ap->ops->qc_issue(qc);
3727 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3728 return AC_ERR_SYSTEM;
3733 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3734 * @qc: command to issue to device
3736 * Using various libata functions and hooks, this function
3737 * starts an ATA command. ATA commands are grouped into
3738 * classes called "protocols", and issuing each type of protocol
3739 * is slightly different.
3741 * May be used as the qc_issue() entry in ata_port_operations.
3744 * spin_lock_irqsave(host_set lock)
3747 * Zero on success, AC_ERR_* mask on failure
3750 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
3752 struct ata_port *ap = qc->ap;
3754 ata_dev_select(ap, qc->dev->devno, 1, 0);
3756 switch (qc->tf.protocol) {
3757 case ATA_PROT_NODATA:
3758 ata_tf_to_host(ap, &qc->tf);
3762 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
3763 ap->ops->bmdma_setup(qc); /* set up bmdma */
3764 ap->ops->bmdma_start(qc); /* initiate bmdma */
3767 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
3768 ata_qc_set_polling(qc);
3769 ata_tf_to_host(ap, &qc->tf);
3770 ap->hsm_task_state = HSM_ST;
3771 ata_queue_pio_task(ap);
3774 case ATA_PROT_ATAPI:
3775 ata_qc_set_polling(qc);
3776 ata_tf_to_host(ap, &qc->tf);
3777 ata_queue_packet_task(ap);
3780 case ATA_PROT_ATAPI_NODATA:
3781 ap->flags |= ATA_FLAG_NOINTR;
3782 ata_tf_to_host(ap, &qc->tf);
3783 ata_queue_packet_task(ap);
3786 case ATA_PROT_ATAPI_DMA:
3787 ap->flags |= ATA_FLAG_NOINTR;
3788 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
3789 ap->ops->bmdma_setup(qc); /* set up bmdma */
3790 ata_queue_packet_task(ap);
3795 return AC_ERR_SYSTEM;
3802 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3803 * @qc: Info associated with this ATA transaction.
3806 * spin_lock_irqsave(host_set lock)
3809 static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
3811 struct ata_port *ap = qc->ap;
3812 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
3814 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
3816 /* load PRD table addr. */
3817 mb(); /* make sure PRD table writes are visible to controller */
3818 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
3820 /* specify data direction, triple-check start bit is clear */
3821 dmactl = readb(mmio + ATA_DMA_CMD);
3822 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
3824 dmactl |= ATA_DMA_WR;
3825 writeb(dmactl, mmio + ATA_DMA_CMD);
3827 /* issue r/w command */
3828 ap->ops->exec_command(ap, &qc->tf);
3832 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3833 * @qc: Info associated with this ATA transaction.
3836 * spin_lock_irqsave(host_set lock)
3839 static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
3841 struct ata_port *ap = qc->ap;
3842 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
3845 /* start host DMA transaction */
3846 dmactl = readb(mmio + ATA_DMA_CMD);
3847 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
3849 /* Strictly, one may wish to issue a readb() here, to
3850 * flush the mmio write. However, control also passes
3851 * to the hardware at this point, and it will interrupt
3852 * us when we are to resume control. So, in effect,
3853 * we don't care when the mmio write flushes.
3854 * Further, a read of the DMA status register _immediately_
3855 * following the write may not be what certain flaky hardware
3856 * is expected, so I think it is best to not add a readb()
3857 * without first all the MMIO ATA cards/mobos.
3858 * Or maybe I'm just being paranoid.
3863 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3864 * @qc: Info associated with this ATA transaction.
3867 * spin_lock_irqsave(host_set lock)
3870 static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
3872 struct ata_port *ap = qc->ap;
3873 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
3876 /* load PRD table addr. */
3877 outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
3879 /* specify data direction, triple-check start bit is clear */
3880 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3881 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
3883 dmactl |= ATA_DMA_WR;
3884 outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3886 /* issue r/w command */
3887 ap->ops->exec_command(ap, &qc->tf);
3891 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3892 * @qc: Info associated with this ATA transaction.
3895 * spin_lock_irqsave(host_set lock)
3898 static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
3900 struct ata_port *ap = qc->ap;
3903 /* start host DMA transaction */
3904 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3905 outb(dmactl | ATA_DMA_START,
3906 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3911 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3912 * @qc: Info associated with this ATA transaction.
3914 * Writes the ATA_DMA_START flag to the DMA command register.
3916 * May be used as the bmdma_start() entry in ata_port_operations.
3919 * spin_lock_irqsave(host_set lock)
3921 void ata_bmdma_start(struct ata_queued_cmd *qc)
3923 if (qc->ap->flags & ATA_FLAG_MMIO)
3924 ata_bmdma_start_mmio(qc);
3926 ata_bmdma_start_pio(qc);
3931 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3932 * @qc: Info associated with this ATA transaction.
3934 * Writes address of PRD table to device's PRD Table Address
3935 * register, sets the DMA control register, and calls
3936 * ops->exec_command() to start the transfer.
3938 * May be used as the bmdma_setup() entry in ata_port_operations.
3941 * spin_lock_irqsave(host_set lock)
3943 void ata_bmdma_setup(struct ata_queued_cmd *qc)
3945 if (qc->ap->flags & ATA_FLAG_MMIO)
3946 ata_bmdma_setup_mmio(qc);
3948 ata_bmdma_setup_pio(qc);
3953 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3954 * @ap: Port associated with this ATA transaction.
3956 * Clear interrupt and error flags in DMA status register.
3958 * May be used as the irq_clear() entry in ata_port_operations.
3961 * spin_lock_irqsave(host_set lock)
3964 void ata_bmdma_irq_clear(struct ata_port *ap)
3966 if (ap->flags & ATA_FLAG_MMIO) {
3967 void __iomem *mmio = ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
3968 writeb(readb(mmio), mmio);
3970 unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
3971 outb(inb(addr), addr);
3978 * ata_bmdma_status - Read PCI IDE BMDMA status
3979 * @ap: Port associated with this ATA transaction.
3981 * Read and return BMDMA status register.
3983 * May be used as the bmdma_status() entry in ata_port_operations.
3986 * spin_lock_irqsave(host_set lock)
3989 u8 ata_bmdma_status(struct ata_port *ap)
3992 if (ap->flags & ATA_FLAG_MMIO) {
3993 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
3994 host_stat = readb(mmio + ATA_DMA_STATUS);
3996 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
4002 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4003 * @qc: Command we are ending DMA for
4005 * Clears the ATA_DMA_START flag in the dma control register
4007 * May be used as the bmdma_stop() entry in ata_port_operations.
4010 * spin_lock_irqsave(host_set lock)
4013 void ata_bmdma_stop(struct ata_queued_cmd *qc)
4015 struct ata_port *ap = qc->ap;
4016 if (ap->flags & ATA_FLAG_MMIO) {
4017 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4019 /* clear start/stop bit */
4020 writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
4021 mmio + ATA_DMA_CMD);
4023 /* clear start/stop bit */
4024 outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
4025 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4028 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4029 ata_altstatus(ap); /* dummy read */
4033 * ata_host_intr - Handle host interrupt for given (port, task)
4034 * @ap: Port on which interrupt arrived (possibly...)
4035 * @qc: Taskfile currently active in engine
4037 * Handle host interrupt for given queued command. Currently,
4038 * only DMA interrupts are handled. All other commands are
4039 * handled via polling with interrupts disabled (nIEN bit).
4042 * spin_lock_irqsave(host_set lock)
4045 * One if interrupt was handled, zero if not (shared irq).
4048 inline unsigned int ata_host_intr (struct ata_port *ap,
4049 struct ata_queued_cmd *qc)
4051 u8 status, host_stat;
4053 switch (qc->tf.protocol) {
4056 case ATA_PROT_ATAPI_DMA:
4057 case ATA_PROT_ATAPI:
4058 /* check status of DMA engine */
4059 host_stat = ap->ops->bmdma_status(ap);
4060 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4062 /* if it's not our irq... */
4063 if (!(host_stat & ATA_DMA_INTR))
4066 /* before we do anything else, clear DMA-Start bit */
4067 ap->ops->bmdma_stop(qc);
4071 case ATA_PROT_ATAPI_NODATA:
4072 case ATA_PROT_NODATA:
4073 /* check altstatus */
4074 status = ata_altstatus(ap);
4075 if (status & ATA_BUSY)
4078 /* check main status, clearing INTRQ */
4079 status = ata_chk_status(ap);
4080 if (unlikely(status & ATA_BUSY))
4082 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4083 ap->id, qc->tf.protocol, status);
4085 /* ack bmdma irq events */
4086 ap->ops->irq_clear(ap);
4088 /* complete taskfile transaction */
4089 qc->err_mask |= ac_err_mask(status);
4090 ata_qc_complete(qc);
4097 return 1; /* irq handled */
4100 ap->stats.idle_irq++;
4103 if ((ap->stats.idle_irq % 1000) == 0) {
4105 ata_irq_ack(ap, 0); /* debug trap */
4106 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4109 return 0; /* irq not handled */
4113 * ata_interrupt - Default ATA host interrupt handler
4114 * @irq: irq line (unused)
4115 * @dev_instance: pointer to our ata_host_set information structure
4118 * Default interrupt handler for PCI IDE devices. Calls
4119 * ata_host_intr() for each port that is not disabled.
4122 * Obtains host_set lock during operation.
4125 * IRQ_NONE or IRQ_HANDLED.
4128 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4130 struct ata_host_set *host_set = dev_instance;
4132 unsigned int handled = 0;
4133 unsigned long flags;
4135 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4136 spin_lock_irqsave(&host_set->lock, flags);
4138 for (i = 0; i < host_set->n_ports; i++) {
4139 struct ata_port *ap;
4141 ap = host_set->ports[i];
4143 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4144 struct ata_queued_cmd *qc;
4146 qc = ata_qc_from_tag(ap, ap->active_tag);
4147 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4148 (qc->flags & ATA_QCFLAG_ACTIVE))
4149 handled |= ata_host_intr(ap, qc);
4153 spin_unlock_irqrestore(&host_set->lock, flags);
4155 return IRQ_RETVAL(handled);
4159 * atapi_packet_task - Write CDB bytes to hardware
4160 * @_data: Port to which ATAPI device is attached.
4162 * When device has indicated its readiness to accept
4163 * a CDB, this function is called. Send the CDB.
4164 * If DMA is to be performed, exit immediately.
4165 * Otherwise, we are in polling mode, so poll
4166 * status under operation succeeds or fails.
4169 * Kernel thread context (may sleep)
4172 static void atapi_packet_task(void *_data)
4174 struct ata_port *ap = _data;
4175 struct ata_queued_cmd *qc;
4178 qc = ata_qc_from_tag(ap, ap->active_tag);
4179 WARN_ON(qc == NULL);
4180 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4182 /* sleep-wait for BSY to clear */
4183 DPRINTK("busy wait\n");
4184 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
4185 qc->err_mask |= AC_ERR_TIMEOUT;
4189 /* make sure DRQ is set */
4190 status = ata_chk_status(ap);
4191 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
4192 qc->err_mask |= AC_ERR_HSM;
4197 DPRINTK("send cdb\n");
4198 WARN_ON(ap->cdb_len < 12);
4200 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
4201 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
4202 unsigned long flags;
4204 /* Once we're done issuing command and kicking bmdma,
4205 * irq handler takes over. To not lose irq, we need
4206 * to clear NOINTR flag before sending cdb, but
4207 * interrupt handler shouldn't be invoked before we're
4208 * finished. Hence, the following locking.
4210 spin_lock_irqsave(&ap->host_set->lock, flags);
4211 ap->flags &= ~ATA_FLAG_NOINTR;
4212 ata_data_xfer(ap, qc->cdb, ap->cdb_len, 1);
4213 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
4214 ap->ops->bmdma_start(qc); /* initiate bmdma */
4215 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4217 ata_data_xfer(ap, qc->cdb, ap->cdb_len, 1);
4219 /* PIO commands are handled by polling */
4220 ap->hsm_task_state = HSM_ST;
4221 ata_queue_pio_task(ap);
4227 ata_poll_qc_complete(qc);
4232 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4233 * without filling any other registers
4235 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4238 struct ata_taskfile tf;
4241 ata_tf_init(ap, &tf, dev->devno);
4244 tf.flags |= ATA_TFLAG_DEVICE;
4245 tf.protocol = ATA_PROT_NODATA;
4247 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4249 printk(KERN_ERR "%s: ata command failed: %d\n",
4255 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4259 if (!ata_try_flush_cache(dev))
4262 if (ata_id_has_flush_ext(dev->id))
4263 cmd = ATA_CMD_FLUSH_EXT;
4265 cmd = ATA_CMD_FLUSH;
4267 return ata_do_simple_cmd(ap, dev, cmd);
4270 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4272 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4275 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4277 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4281 * ata_device_resume - wakeup a previously suspended devices
4282 * @ap: port the device is connected to
4283 * @dev: the device to resume
4285 * Kick the drive back into action, by sending it an idle immediate
4286 * command and making sure its transfer mode matches between drive
4290 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4292 if (ap->flags & ATA_FLAG_SUSPENDED) {
4293 ap->flags &= ~ATA_FLAG_SUSPENDED;
4296 if (!ata_dev_present(dev))
4298 if (dev->class == ATA_DEV_ATA)
4299 ata_start_drive(ap, dev);
4305 * ata_device_suspend - prepare a device for suspend
4306 * @ap: port the device is connected to
4307 * @dev: the device to suspend
4309 * Flush the cache on the drive, if appropriate, then issue a
4310 * standbynow command.
4312 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
4314 if (!ata_dev_present(dev))
4316 if (dev->class == ATA_DEV_ATA)
4317 ata_flush_cache(ap, dev);
4319 ata_standby_drive(ap, dev);
4320 ap->flags |= ATA_FLAG_SUSPENDED;
4325 * ata_port_start - Set port up for dma.
4326 * @ap: Port to initialize
4328 * Called just after data structures for each port are
4329 * initialized. Allocates space for PRD table.
4331 * May be used as the port_start() entry in ata_port_operations.
4334 * Inherited from caller.
4337 int ata_port_start (struct ata_port *ap)
4339 struct device *dev = ap->host_set->dev;
4342 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4346 rc = ata_pad_alloc(ap, dev);
4348 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4352 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4359 * ata_port_stop - Undo ata_port_start()
4360 * @ap: Port to shut down
4362 * Frees the PRD table.
4364 * May be used as the port_stop() entry in ata_port_operations.
4367 * Inherited from caller.
4370 void ata_port_stop (struct ata_port *ap)
4372 struct device *dev = ap->host_set->dev;
4374 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4375 ata_pad_free(ap, dev);
4378 void ata_host_stop (struct ata_host_set *host_set)
4380 if (host_set->mmio_base)
4381 iounmap(host_set->mmio_base);
4386 * ata_host_remove - Unregister SCSI host structure with upper layers
4387 * @ap: Port to unregister
4388 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4391 * Inherited from caller.
4394 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4396 struct Scsi_Host *sh = ap->host;
4401 scsi_remove_host(sh);
4403 ap->ops->port_stop(ap);
4407 * ata_host_init - Initialize an ata_port structure
4408 * @ap: Structure to initialize
4409 * @host: associated SCSI mid-layer structure
4410 * @host_set: Collection of hosts to which @ap belongs
4411 * @ent: Probe information provided by low-level driver
4412 * @port_no: Port number associated with this ata_port
4414 * Initialize a new ata_port structure, and its associated
4418 * Inherited from caller.
4421 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4422 struct ata_host_set *host_set,
4423 const struct ata_probe_ent *ent, unsigned int port_no)
4429 host->max_channel = 1;
4430 host->unique_id = ata_unique_id++;
4431 host->max_cmd_len = 12;
4433 ap->flags = ATA_FLAG_PORT_DISABLED;
4434 ap->id = host->unique_id;
4436 ap->ctl = ATA_DEVCTL_OBS;
4437 ap->host_set = host_set;
4438 ap->port_no = port_no;
4440 ent->legacy_mode ? ent->hard_port_no : port_no;
4441 ap->pio_mask = ent->pio_mask;
4442 ap->mwdma_mask = ent->mwdma_mask;
4443 ap->udma_mask = ent->udma_mask;
4444 ap->flags |= ent->host_flags;
4445 ap->ops = ent->port_ops;
4446 ap->cbl = ATA_CBL_NONE;
4447 ap->active_tag = ATA_TAG_POISON;
4448 ap->last_ctl = 0xFF;
4450 INIT_WORK(&ap->packet_task, atapi_packet_task, ap);
4451 INIT_WORK(&ap->pio_task, ata_pio_task, ap);
4452 INIT_LIST_HEAD(&ap->eh_done_q);
4454 for (i = 0; i < ATA_MAX_DEVICES; i++)
4455 ap->device[i].devno = i;
4458 ap->stats.unhandled_irq = 1;
4459 ap->stats.idle_irq = 1;
4462 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4466 * ata_host_add - Attach low-level ATA driver to system
4467 * @ent: Information provided by low-level driver
4468 * @host_set: Collections of ports to which we add
4469 * @port_no: Port number associated with this host
4471 * Attach low-level ATA driver to system.
4474 * PCI/etc. bus probe sem.
4477 * New ata_port on success, for NULL on error.
4480 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4481 struct ata_host_set *host_set,
4482 unsigned int port_no)
4484 struct Scsi_Host *host;
4485 struct ata_port *ap;
4489 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4493 ap = (struct ata_port *) &host->hostdata[0];
4495 ata_host_init(ap, host, host_set, ent, port_no);
4497 rc = ap->ops->port_start(ap);
4504 scsi_host_put(host);
4509 * ata_device_add - Register hardware device with ATA and SCSI layers
4510 * @ent: Probe information describing hardware device to be registered
4512 * This function processes the information provided in the probe
4513 * information struct @ent, allocates the necessary ATA and SCSI
4514 * host information structures, initializes them, and registers
4515 * everything with requisite kernel subsystems.
4517 * This function requests irqs, probes the ATA bus, and probes
4521 * PCI/etc. bus probe sem.
4524 * Number of ports registered. Zero on error (no ports registered).
4527 int ata_device_add(const struct ata_probe_ent *ent)
4529 unsigned int count = 0, i;
4530 struct device *dev = ent->dev;
4531 struct ata_host_set *host_set;
4534 /* alloc a container for our list of ATA ports (buses) */
4535 host_set = kzalloc(sizeof(struct ata_host_set) +
4536 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4539 spin_lock_init(&host_set->lock);
4541 host_set->dev = dev;
4542 host_set->n_ports = ent->n_ports;
4543 host_set->irq = ent->irq;
4544 host_set->mmio_base = ent->mmio_base;
4545 host_set->private_data = ent->private_data;
4546 host_set->ops = ent->port_ops;
4548 /* register each port bound to this device */
4549 for (i = 0; i < ent->n_ports; i++) {
4550 struct ata_port *ap;
4551 unsigned long xfer_mode_mask;
4553 ap = ata_host_add(ent, host_set, i);
4557 host_set->ports[i] = ap;
4558 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4559 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4560 (ap->pio_mask << ATA_SHIFT_PIO);
4562 /* print per-port info to dmesg */
4563 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4564 "bmdma 0x%lX irq %lu\n",
4566 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4567 ata_mode_string(xfer_mode_mask),
4568 ap->ioaddr.cmd_addr,
4569 ap->ioaddr.ctl_addr,
4570 ap->ioaddr.bmdma_addr,
4574 host_set->ops->irq_clear(ap);
4581 /* obtain irq, that is shared between channels */
4582 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4583 DRV_NAME, host_set))
4586 /* perform each probe synchronously */
4587 DPRINTK("probe begin\n");
4588 for (i = 0; i < count; i++) {
4589 struct ata_port *ap;
4592 ap = host_set->ports[i];
4594 DPRINTK("ata%u: bus probe begin\n", ap->id);
4595 rc = ata_bus_probe(ap);
4596 DPRINTK("ata%u: bus probe end\n", ap->id);
4599 /* FIXME: do something useful here?
4600 * Current libata behavior will
4601 * tear down everything when
4602 * the module is removed
4603 * or the h/w is unplugged.
4607 rc = scsi_add_host(ap->host, dev);
4609 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4611 /* FIXME: do something useful here */
4612 /* FIXME: handle unconditional calls to
4613 * scsi_scan_host and ata_host_remove, below,
4619 /* probes are done, now scan each port's disk(s) */
4620 DPRINTK("host probe begin\n");
4621 for (i = 0; i < count; i++) {
4622 struct ata_port *ap = host_set->ports[i];
4624 ata_scsi_scan_host(ap);
4627 dev_set_drvdata(dev, host_set);
4629 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4630 return ent->n_ports; /* success */
4633 for (i = 0; i < count; i++) {
4634 ata_host_remove(host_set->ports[i], 1);
4635 scsi_host_put(host_set->ports[i]->host);
4639 VPRINTK("EXIT, returning 0\n");
4644 * ata_host_set_remove - PCI layer callback for device removal
4645 * @host_set: ATA host set that was removed
4647 * Unregister all objects associated with this host set. Free those
4651 * Inherited from calling layer (may sleep).
4654 void ata_host_set_remove(struct ata_host_set *host_set)
4656 struct ata_port *ap;
4659 for (i = 0; i < host_set->n_ports; i++) {
4660 ap = host_set->ports[i];
4661 scsi_remove_host(ap->host);
4664 free_irq(host_set->irq, host_set);
4666 for (i = 0; i < host_set->n_ports; i++) {
4667 ap = host_set->ports[i];
4669 ata_scsi_release(ap->host);
4671 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4672 struct ata_ioports *ioaddr = &ap->ioaddr;
4674 if (ioaddr->cmd_addr == 0x1f0)
4675 release_region(0x1f0, 8);
4676 else if (ioaddr->cmd_addr == 0x170)
4677 release_region(0x170, 8);
4680 scsi_host_put(ap->host);
4683 if (host_set->ops->host_stop)
4684 host_set->ops->host_stop(host_set);
4690 * ata_scsi_release - SCSI layer callback hook for host unload
4691 * @host: libata host to be unloaded
4693 * Performs all duties necessary to shut down a libata port...
4694 * Kill port kthread, disable port, and release resources.
4697 * Inherited from SCSI layer.
4703 int ata_scsi_release(struct Scsi_Host *host)
4705 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4709 ap->ops->port_disable(ap);
4710 ata_host_remove(ap, 0);
4717 * ata_std_ports - initialize ioaddr with standard port offsets.
4718 * @ioaddr: IO address structure to be initialized
4720 * Utility function which initializes data_addr, error_addr,
4721 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4722 * device_addr, status_addr, and command_addr to standard offsets
4723 * relative to cmd_addr.
4725 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4728 void ata_std_ports(struct ata_ioports *ioaddr)
4730 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4731 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4732 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4733 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4734 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4735 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4736 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4737 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4738 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4739 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4745 void ata_pci_host_stop (struct ata_host_set *host_set)
4747 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4749 pci_iounmap(pdev, host_set->mmio_base);
4753 * ata_pci_remove_one - PCI layer callback for device removal
4754 * @pdev: PCI device that was removed
4756 * PCI layer indicates to libata via this hook that
4757 * hot-unplug or module unload event has occurred.
4758 * Handle this by unregistering all objects associated
4759 * with this PCI device. Free those objects. Then finally
4760 * release PCI resources and disable device.
4763 * Inherited from PCI layer (may sleep).
4766 void ata_pci_remove_one (struct pci_dev *pdev)
4768 struct device *dev = pci_dev_to_dev(pdev);
4769 struct ata_host_set *host_set = dev_get_drvdata(dev);
4771 ata_host_set_remove(host_set);
4772 pci_release_regions(pdev);
4773 pci_disable_device(pdev);
4774 dev_set_drvdata(dev, NULL);
4777 /* move to PCI subsystem */
4778 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4780 unsigned long tmp = 0;
4782 switch (bits->width) {
4785 pci_read_config_byte(pdev, bits->reg, &tmp8);
4791 pci_read_config_word(pdev, bits->reg, &tmp16);
4797 pci_read_config_dword(pdev, bits->reg, &tmp32);
4808 return (tmp == bits->val) ? 1 : 0;
4811 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4813 pci_save_state(pdev);
4814 pci_disable_device(pdev);
4815 pci_set_power_state(pdev, PCI_D3hot);
4819 int ata_pci_device_resume(struct pci_dev *pdev)
4821 pci_set_power_state(pdev, PCI_D0);
4822 pci_restore_state(pdev);
4823 pci_enable_device(pdev);
4824 pci_set_master(pdev);
4827 #endif /* CONFIG_PCI */
4830 static int __init ata_init(void)
4832 ata_wq = create_workqueue("ata");
4836 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4840 static void __exit ata_exit(void)
4842 destroy_workqueue(ata_wq);
4845 module_init(ata_init);
4846 module_exit(ata_exit);
4848 static unsigned long ratelimit_time;
4849 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4851 int ata_ratelimit(void)
4854 unsigned long flags;
4856 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4858 if (time_after(jiffies, ratelimit_time)) {
4860 ratelimit_time = jiffies + (HZ/5);
4864 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4870 * libata is essentially a library of internal helper functions for
4871 * low-level ATA host controller drivers. As such, the API/ABI is
4872 * likely to change as new drivers are added and updated.
4873 * Do not depend on ABI/API stability.
4876 EXPORT_SYMBOL_GPL(ata_std_bios_param);
4877 EXPORT_SYMBOL_GPL(ata_std_ports);
4878 EXPORT_SYMBOL_GPL(ata_device_add);
4879 EXPORT_SYMBOL_GPL(ata_host_set_remove);
4880 EXPORT_SYMBOL_GPL(ata_sg_init);
4881 EXPORT_SYMBOL_GPL(ata_sg_init_one);
4882 EXPORT_SYMBOL_GPL(__ata_qc_complete);
4883 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4884 EXPORT_SYMBOL_GPL(ata_eng_timeout);
4885 EXPORT_SYMBOL_GPL(ata_tf_load);
4886 EXPORT_SYMBOL_GPL(ata_tf_read);
4887 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4888 EXPORT_SYMBOL_GPL(ata_std_dev_select);
4889 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4890 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4891 EXPORT_SYMBOL_GPL(ata_check_status);
4892 EXPORT_SYMBOL_GPL(ata_altstatus);
4893 EXPORT_SYMBOL_GPL(ata_exec_command);
4894 EXPORT_SYMBOL_GPL(ata_port_start);
4895 EXPORT_SYMBOL_GPL(ata_port_stop);
4896 EXPORT_SYMBOL_GPL(ata_host_stop);
4897 EXPORT_SYMBOL_GPL(ata_interrupt);
4898 EXPORT_SYMBOL_GPL(ata_qc_prep);
4899 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4900 EXPORT_SYMBOL_GPL(ata_bmdma_start);
4901 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4902 EXPORT_SYMBOL_GPL(ata_bmdma_status);
4903 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4904 EXPORT_SYMBOL_GPL(ata_port_probe);
4905 EXPORT_SYMBOL_GPL(sata_phy_reset);
4906 EXPORT_SYMBOL_GPL(__sata_phy_reset);
4907 EXPORT_SYMBOL_GPL(ata_bus_reset);
4908 EXPORT_SYMBOL_GPL(ata_std_probeinit);
4909 EXPORT_SYMBOL_GPL(ata_std_softreset);
4910 EXPORT_SYMBOL_GPL(sata_std_hardreset);
4911 EXPORT_SYMBOL_GPL(ata_std_postreset);
4912 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
4913 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
4914 EXPORT_SYMBOL_GPL(ata_port_disable);
4915 EXPORT_SYMBOL_GPL(ata_ratelimit);
4916 EXPORT_SYMBOL_GPL(ata_busy_sleep);
4917 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
4918 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4919 EXPORT_SYMBOL_GPL(ata_scsi_timed_out);
4920 EXPORT_SYMBOL_GPL(ata_scsi_error);
4921 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
4922 EXPORT_SYMBOL_GPL(ata_scsi_release);
4923 EXPORT_SYMBOL_GPL(ata_host_intr);
4924 EXPORT_SYMBOL_GPL(ata_dev_classify);
4925 EXPORT_SYMBOL_GPL(ata_dev_id_string);
4926 EXPORT_SYMBOL_GPL(ata_dev_id_c_string);
4927 EXPORT_SYMBOL_GPL(ata_dev_config);
4928 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
4929 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
4930 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
4932 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
4933 EXPORT_SYMBOL_GPL(ata_timing_compute);
4934 EXPORT_SYMBOL_GPL(ata_timing_merge);
4937 EXPORT_SYMBOL_GPL(pci_test_config_bits);
4938 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
4939 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
4940 EXPORT_SYMBOL_GPL(ata_pci_init_one);
4941 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
4942 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
4943 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
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);