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 unsigned int ata_dev_init_params(struct ata_port *ap,
66 struct ata_device *dev);
67 static void ata_set_mode(struct ata_port *ap);
68 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
69 static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift);
70 static int fgb(u32 bitmap);
71 static int ata_choose_xfer_mode(const struct ata_port *ap,
73 unsigned int *xfer_shift_out);
75 static unsigned int ata_unique_id = 1;
76 static struct workqueue_struct *ata_wq;
78 int atapi_enabled = 0;
79 module_param(atapi_enabled, int, 0444);
80 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
82 MODULE_AUTHOR("Jeff Garzik");
83 MODULE_DESCRIPTION("Library module for ATA devices");
84 MODULE_LICENSE("GPL");
85 MODULE_VERSION(DRV_VERSION);
89 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
90 * @tf: Taskfile to convert
91 * @fis: Buffer into which data will output
92 * @pmp: Port multiplier port
94 * Converts a standard ATA taskfile to a Serial ATA
95 * FIS structure (Register - Host to Device).
98 * Inherited from caller.
101 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
103 fis[0] = 0x27; /* Register - Host to Device FIS */
104 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
105 bit 7 indicates Command FIS */
106 fis[2] = tf->command;
107 fis[3] = tf->feature;
114 fis[8] = tf->hob_lbal;
115 fis[9] = tf->hob_lbam;
116 fis[10] = tf->hob_lbah;
117 fis[11] = tf->hob_feature;
120 fis[13] = tf->hob_nsect;
131 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
132 * @fis: Buffer from which data will be input
133 * @tf: Taskfile to output
135 * Converts a serial ATA FIS structure to a standard ATA taskfile.
138 * Inherited from caller.
141 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
143 tf->command = fis[2]; /* status */
144 tf->feature = fis[3]; /* error */
151 tf->hob_lbal = fis[8];
152 tf->hob_lbam = fis[9];
153 tf->hob_lbah = fis[10];
156 tf->hob_nsect = fis[13];
159 static const u8 ata_rw_cmds[] = {
163 ATA_CMD_READ_MULTI_EXT,
164 ATA_CMD_WRITE_MULTI_EXT,
168 ATA_CMD_WRITE_MULTI_FUA_EXT,
172 ATA_CMD_PIO_READ_EXT,
173 ATA_CMD_PIO_WRITE_EXT,
186 ATA_CMD_WRITE_FUA_EXT
190 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
191 * @qc: command to examine and configure
193 * Examine the device configuration and tf->flags to calculate
194 * the proper read/write commands and protocol to use.
199 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
201 struct ata_taskfile *tf = &qc->tf;
202 struct ata_device *dev = qc->dev;
205 int index, fua, lba48, write;
207 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
208 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
209 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
211 if (dev->flags & ATA_DFLAG_PIO) {
212 tf->protocol = ATA_PROT_PIO;
213 index = dev->multi_count ? 0 : 8;
214 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
215 /* Unable to use DMA due to host limitation */
216 tf->protocol = ATA_PROT_PIO;
217 index = dev->multi_count ? 0 : 8;
219 tf->protocol = ATA_PROT_DMA;
223 cmd = ata_rw_cmds[index + fua + lba48 + write];
231 static const char * const xfer_mode_str[] = {
251 * ata_udma_string - convert UDMA bit offset to string
252 * @mask: mask of bits supported; only highest bit counts.
254 * Determine string which represents the highest speed
255 * (highest bit in @udma_mask).
261 * Constant C string representing highest speed listed in
262 * @udma_mask, or the constant C string "<n/a>".
265 static const char *ata_mode_string(unsigned int mask)
269 for (i = 7; i >= 0; i--)
272 for (i = ATA_SHIFT_MWDMA + 2; i >= ATA_SHIFT_MWDMA; i--)
275 for (i = ATA_SHIFT_PIO + 4; i >= ATA_SHIFT_PIO; i--)
282 return xfer_mode_str[i];
286 * ata_pio_devchk - PATA device presence detection
287 * @ap: ATA channel to examine
288 * @device: Device to examine (starting at zero)
290 * This technique was originally described in
291 * Hale Landis's ATADRVR (www.ata-atapi.com), and
292 * later found its way into the ATA/ATAPI spec.
294 * Write a pattern to the ATA shadow registers,
295 * and if a device is present, it will respond by
296 * correctly storing and echoing back the
297 * ATA shadow register contents.
303 static unsigned int ata_pio_devchk(struct ata_port *ap,
306 struct ata_ioports *ioaddr = &ap->ioaddr;
309 ap->ops->dev_select(ap, device);
311 outb(0x55, ioaddr->nsect_addr);
312 outb(0xaa, ioaddr->lbal_addr);
314 outb(0xaa, ioaddr->nsect_addr);
315 outb(0x55, ioaddr->lbal_addr);
317 outb(0x55, ioaddr->nsect_addr);
318 outb(0xaa, ioaddr->lbal_addr);
320 nsect = inb(ioaddr->nsect_addr);
321 lbal = inb(ioaddr->lbal_addr);
323 if ((nsect == 0x55) && (lbal == 0xaa))
324 return 1; /* we found a device */
326 return 0; /* nothing found */
330 * ata_mmio_devchk - PATA device presence detection
331 * @ap: ATA channel to examine
332 * @device: Device to examine (starting at zero)
334 * This technique was originally described in
335 * Hale Landis's ATADRVR (www.ata-atapi.com), and
336 * later found its way into the ATA/ATAPI spec.
338 * Write a pattern to the ATA shadow registers,
339 * and if a device is present, it will respond by
340 * correctly storing and echoing back the
341 * ATA shadow register contents.
347 static unsigned int ata_mmio_devchk(struct ata_port *ap,
350 struct ata_ioports *ioaddr = &ap->ioaddr;
353 ap->ops->dev_select(ap, device);
355 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
356 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
358 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
359 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
361 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
362 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
364 nsect = readb((void __iomem *) ioaddr->nsect_addr);
365 lbal = readb((void __iomem *) ioaddr->lbal_addr);
367 if ((nsect == 0x55) && (lbal == 0xaa))
368 return 1; /* we found a device */
370 return 0; /* nothing found */
374 * ata_devchk - PATA device presence detection
375 * @ap: ATA channel to examine
376 * @device: Device to examine (starting at zero)
378 * Dispatch ATA device presence detection, depending
379 * on whether we are using PIO or MMIO to talk to the
380 * ATA shadow registers.
386 static unsigned int ata_devchk(struct ata_port *ap,
389 if (ap->flags & ATA_FLAG_MMIO)
390 return ata_mmio_devchk(ap, device);
391 return ata_pio_devchk(ap, device);
395 * ata_dev_classify - determine device type based on ATA-spec signature
396 * @tf: ATA taskfile register set for device to be identified
398 * Determine from taskfile register contents whether a device is
399 * ATA or ATAPI, as per "Signature and persistence" section
400 * of ATA/PI spec (volume 1, sect 5.14).
406 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
407 * the event of failure.
410 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
412 /* Apple's open source Darwin code hints that some devices only
413 * put a proper signature into the LBA mid/high registers,
414 * So, we only check those. It's sufficient for uniqueness.
417 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
418 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
419 DPRINTK("found ATA device by sig\n");
423 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
424 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
425 DPRINTK("found ATAPI device by sig\n");
426 return ATA_DEV_ATAPI;
429 DPRINTK("unknown device\n");
430 return ATA_DEV_UNKNOWN;
434 * ata_dev_try_classify - Parse returned ATA device signature
435 * @ap: ATA channel to examine
436 * @device: Device to examine (starting at zero)
437 * @r_err: Value of error register on completion
439 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
440 * an ATA/ATAPI-defined set of values is placed in the ATA
441 * shadow registers, indicating the results of device detection
444 * Select the ATA device, and read the values from the ATA shadow
445 * registers. Then parse according to the Error register value,
446 * and the spec-defined values examined by ata_dev_classify().
452 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
456 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
458 struct ata_taskfile tf;
462 ap->ops->dev_select(ap, device);
464 memset(&tf, 0, sizeof(tf));
466 ap->ops->tf_read(ap, &tf);
471 /* see if device passed diags */
474 else if ((device == 0) && (err == 0x81))
479 /* determine if device is ATA or ATAPI */
480 class = ata_dev_classify(&tf);
482 if (class == ATA_DEV_UNKNOWN)
484 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
490 * ata_id_string - Convert IDENTIFY DEVICE page into string
491 * @id: IDENTIFY DEVICE results we will examine
492 * @s: string into which data is output
493 * @ofs: offset into identify device page
494 * @len: length of string to return. must be an even number.
496 * The strings in the IDENTIFY DEVICE page are broken up into
497 * 16-bit chunks. Run through the string, and output each
498 * 8-bit chunk linearly, regardless of platform.
504 void ata_id_string(const u16 *id, unsigned char *s,
505 unsigned int ofs, unsigned int len)
524 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
525 * @id: IDENTIFY DEVICE results we will examine
526 * @s: string into which data is output
527 * @ofs: offset into identify device page
528 * @len: length of string to return. must be an odd number.
530 * This function is identical to ata_id_string except that it
531 * trims trailing spaces and terminates the resulting string with
532 * null. @len must be actual maximum length (even number) + 1.
537 void ata_id_c_string(const u16 *id, unsigned char *s,
538 unsigned int ofs, unsigned int len)
544 ata_id_string(id, s, ofs, len - 1);
546 p = s + strnlen(s, len - 1);
547 while (p > s && p[-1] == ' ')
552 static u64 ata_id_n_sectors(const u16 *id)
554 if (ata_id_has_lba(id)) {
555 if (ata_id_has_lba48(id))
556 return ata_id_u64(id, 100);
558 return ata_id_u32(id, 60);
560 if (ata_id_current_chs_valid(id))
561 return ata_id_u32(id, 57);
563 return id[1] * id[3] * id[6];
568 * ata_noop_dev_select - Select device 0/1 on ATA bus
569 * @ap: ATA channel to manipulate
570 * @device: ATA device (numbered from zero) to select
572 * This function performs no actual function.
574 * May be used as the dev_select() entry in ata_port_operations.
579 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
585 * ata_std_dev_select - Select device 0/1 on ATA bus
586 * @ap: ATA channel to manipulate
587 * @device: ATA device (numbered from zero) to select
589 * Use the method defined in the ATA specification to
590 * make either device 0, or device 1, active on the
591 * ATA channel. Works with both PIO and MMIO.
593 * May be used as the dev_select() entry in ata_port_operations.
599 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
604 tmp = ATA_DEVICE_OBS;
606 tmp = ATA_DEVICE_OBS | ATA_DEV1;
608 if (ap->flags & ATA_FLAG_MMIO) {
609 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
611 outb(tmp, ap->ioaddr.device_addr);
613 ata_pause(ap); /* needed; also flushes, for mmio */
617 * ata_dev_select - Select device 0/1 on ATA bus
618 * @ap: ATA channel to manipulate
619 * @device: ATA device (numbered from zero) to select
620 * @wait: non-zero to wait for Status register BSY bit to clear
621 * @can_sleep: non-zero if context allows sleeping
623 * Use the method defined in the ATA specification to
624 * make either device 0, or device 1, active on the
627 * This is a high-level version of ata_std_dev_select(),
628 * which additionally provides the services of inserting
629 * the proper pauses and status polling, where needed.
635 void ata_dev_select(struct ata_port *ap, unsigned int device,
636 unsigned int wait, unsigned int can_sleep)
638 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
639 ap->id, device, wait);
644 ap->ops->dev_select(ap, device);
647 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
654 * ata_dump_id - IDENTIFY DEVICE info debugging output
655 * @id: IDENTIFY DEVICE page to dump
657 * Dump selected 16-bit words from the given IDENTIFY DEVICE
664 static inline void ata_dump_id(const u16 *id)
666 DPRINTK("49==0x%04x "
676 DPRINTK("80==0x%04x "
686 DPRINTK("88==0x%04x "
693 * Compute the PIO modes available for this device. This is not as
694 * trivial as it seems if we must consider early devices correctly.
696 * FIXME: pre IDE drive timing (do we care ?).
699 static unsigned int ata_pio_modes(const struct ata_device *adev)
703 /* Usual case. Word 53 indicates word 64 is valid */
704 if (adev->id[ATA_ID_FIELD_VALID] & (1 << 1)) {
705 modes = adev->id[ATA_ID_PIO_MODES] & 0x03;
711 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
712 number for the maximum. Turn it into a mask and return it */
713 modes = (2 << ((adev->id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF)) - 1 ;
715 /* But wait.. there's more. Design your standards by committee and
716 you too can get a free iordy field to process. However its the
717 speeds not the modes that are supported... Note drivers using the
718 timing API will get this right anyway */
722 ata_queue_packet_task(struct ata_port *ap)
724 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
725 queue_work(ata_wq, &ap->packet_task);
729 ata_queue_pio_task(struct ata_port *ap)
731 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
732 queue_work(ata_wq, &ap->pio_task);
736 ata_queue_delayed_pio_task(struct ata_port *ap, unsigned long delay)
738 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
739 queue_delayed_work(ata_wq, &ap->pio_task, delay);
743 * ata_flush_pio_tasks - Flush pio_task and packet_task
744 * @ap: the target ata_port
746 * After this function completes, pio_task and packet_task are
747 * guranteed not to be running or scheduled.
750 * Kernel thread context (may sleep)
753 static void ata_flush_pio_tasks(struct ata_port *ap)
760 spin_lock_irqsave(&ap->host_set->lock, flags);
761 ap->flags |= ATA_FLAG_FLUSH_PIO_TASK;
762 spin_unlock_irqrestore(&ap->host_set->lock, flags);
764 DPRINTK("flush #1\n");
765 flush_workqueue(ata_wq);
768 * At this point, if a task is running, it's guaranteed to see
769 * the FLUSH flag; thus, it will never queue pio tasks again.
772 tmp |= cancel_delayed_work(&ap->pio_task);
773 tmp |= cancel_delayed_work(&ap->packet_task);
775 DPRINTK("flush #2\n");
776 flush_workqueue(ata_wq);
779 spin_lock_irqsave(&ap->host_set->lock, flags);
780 ap->flags &= ~ATA_FLAG_FLUSH_PIO_TASK;
781 spin_unlock_irqrestore(&ap->host_set->lock, flags);
786 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
788 struct completion *waiting = qc->private_data;
790 qc->ap->ops->tf_read(qc->ap, &qc->tf);
795 * ata_exec_internal - execute libata internal command
796 * @ap: Port to which the command is sent
797 * @dev: Device to which the command is sent
798 * @tf: Taskfile registers for the command and the result
799 * @dma_dir: Data tranfer direction of the command
800 * @buf: Data buffer of the command
801 * @buflen: Length of data buffer
803 * Executes libata internal command with timeout. @tf contains
804 * command on entry and result on return. Timeout and error
805 * conditions are reported via return value. No recovery action
806 * is taken after a command times out. It's caller's duty to
807 * clean up after timeout.
810 * None. Should be called with kernel context, might sleep.
814 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
815 struct ata_taskfile *tf,
816 int dma_dir, void *buf, unsigned int buflen)
818 u8 command = tf->command;
819 struct ata_queued_cmd *qc;
820 DECLARE_COMPLETION(wait);
822 unsigned int err_mask;
824 spin_lock_irqsave(&ap->host_set->lock, flags);
826 qc = ata_qc_new_init(ap, dev);
830 qc->dma_dir = dma_dir;
831 if (dma_dir != DMA_NONE) {
832 ata_sg_init_one(qc, buf, buflen);
833 qc->nsect = buflen / ATA_SECT_SIZE;
836 qc->private_data = &wait;
837 qc->complete_fn = ata_qc_complete_internal;
839 qc->err_mask = ata_qc_issue(qc);
843 spin_unlock_irqrestore(&ap->host_set->lock, flags);
845 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
846 spin_lock_irqsave(&ap->host_set->lock, flags);
848 /* We're racing with irq here. If we lose, the
849 * following test prevents us from completing the qc
850 * again. If completion irq occurs after here but
851 * before the caller cleans up, it will result in a
852 * spurious interrupt. We can live with that.
854 if (qc->flags & ATA_QCFLAG_ACTIVE) {
855 qc->err_mask = AC_ERR_TIMEOUT;
857 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
861 spin_unlock_irqrestore(&ap->host_set->lock, flags);
865 err_mask = qc->err_mask;
873 * ata_pio_need_iordy - check if iordy needed
876 * Check if the current speed of the device requires IORDY. Used
877 * by various controllers for chip configuration.
880 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
883 int speed = adev->pio_mode - XFER_PIO_0;
890 /* If we have no drive specific rule, then PIO 2 is non IORDY */
892 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
893 pio = adev->id[ATA_ID_EIDE_PIO];
894 /* Is the speed faster than the drive allows non IORDY ? */
896 /* This is cycle times not frequency - watch the logic! */
897 if (pio > 240) /* PIO2 is 240nS per cycle */
906 * ata_dev_identify - obtain IDENTIFY x DEVICE page
907 * @ap: port on which device we wish to probe resides
908 * @device: device bus address, starting at zero
910 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
911 * command, and read back the 512-byte device information page.
912 * The device information page is fed to us via the standard
913 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
914 * using standard PIO-IN paths)
916 * After reading the device information page, we use several
917 * bits of information from it to initialize data structures
918 * that will be used during the lifetime of the ata_device.
919 * Other data from the info page is used to disqualify certain
920 * older ATA devices we do not wish to support.
923 * Inherited from caller. Some functions called by this function
924 * obtain the host_set lock.
927 static void ata_dev_identify(struct ata_port *ap, unsigned int device)
929 struct ata_device *dev = &ap->device[device];
930 unsigned int major_version;
931 unsigned long xfer_modes;
932 unsigned int using_edd;
933 struct ata_taskfile tf;
934 unsigned int err_mask;
937 if (!ata_dev_present(dev)) {
938 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
943 if (ap->ops->probe_reset ||
944 ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
949 DPRINTK("ENTER, host %u, dev %u\n", ap->id, device);
951 WARN_ON(dev->class != ATA_DEV_ATA && dev->class != ATA_DEV_ATAPI &&
952 dev->class != ATA_DEV_NONE);
954 ata_dev_select(ap, device, 1, 1); /* select device 0/1 */
957 ata_tf_init(ap, &tf, device);
959 if (dev->class == ATA_DEV_ATA) {
960 tf.command = ATA_CMD_ID_ATA;
961 DPRINTK("do ATA identify\n");
963 tf.command = ATA_CMD_ID_ATAPI;
964 DPRINTK("do ATAPI identify\n");
967 tf.protocol = ATA_PROT_PIO;
969 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
970 dev->id, sizeof(dev->id));
973 if (err_mask & ~AC_ERR_DEV)
977 * arg! EDD works for all test cases, but seems to return
978 * the ATA signature for some ATAPI devices. Until the
979 * reason for this is found and fixed, we fix up the mess
980 * here. If IDENTIFY DEVICE returns command aborted
981 * (as ATAPI devices do), then we issue an
982 * IDENTIFY PACKET DEVICE.
984 * ATA software reset (SRST, the default) does not appear
985 * to have this problem.
987 if ((using_edd) && (dev->class == ATA_DEV_ATA)) {
989 if (err & ATA_ABORTED) {
990 dev->class = ATA_DEV_ATAPI;
997 swap_buf_le16(dev->id, ATA_ID_WORDS);
999 /* print device capabilities */
1000 printk(KERN_DEBUG "ata%u: dev %u cfg "
1001 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1002 ap->id, device, dev->id[49],
1003 dev->id[82], dev->id[83], dev->id[84],
1004 dev->id[85], dev->id[86], dev->id[87],
1008 * common ATA, ATAPI feature tests
1011 /* we require DMA support (bits 8 of word 49) */
1012 if (!ata_id_has_dma(dev->id)) {
1013 printk(KERN_DEBUG "ata%u: no dma\n", ap->id);
1017 /* quick-n-dirty find max transfer mode; for printk only */
1018 xfer_modes = dev->id[ATA_ID_UDMA_MODES];
1020 xfer_modes = (dev->id[ATA_ID_MWDMA_MODES]) << ATA_SHIFT_MWDMA;
1022 xfer_modes = ata_pio_modes(dev);
1024 ata_dump_id(dev->id);
1026 /* ATA-specific feature tests */
1027 if (dev->class == ATA_DEV_ATA) {
1028 dev->n_sectors = ata_id_n_sectors(dev->id);
1030 if (!ata_id_is_ata(dev->id)) /* sanity check */
1033 /* get major version */
1034 major_version = ata_id_major_version(dev->id);
1037 * The exact sequence expected by certain pre-ATA4 drives is:
1040 * INITIALIZE DEVICE PARAMETERS
1042 * Some drives were very specific about that exact sequence.
1044 if (major_version < 4 || (!ata_id_has_lba(dev->id))) {
1045 err_mask = ata_dev_init_params(ap, dev);
1047 printk(KERN_ERR "ata%u: failed to init "
1048 "parameters, disabled\n", ap->id);
1052 /* current CHS translation info (id[53-58]) might be
1053 * changed. reread the identify device info.
1055 ata_dev_reread_id(ap, dev);
1058 if (ata_id_has_lba(dev->id)) {
1059 dev->flags |= ATA_DFLAG_LBA;
1061 if (ata_id_has_lba48(dev->id))
1062 dev->flags |= ATA_DFLAG_LBA48;
1064 /* print device info to dmesg */
1065 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1068 ata_mode_string(xfer_modes),
1069 (unsigned long long)dev->n_sectors,
1070 dev->flags & ATA_DFLAG_LBA48 ? " LBA48" : " LBA");
1074 /* Default translation */
1075 dev->cylinders = dev->id[1];
1076 dev->heads = dev->id[3];
1077 dev->sectors = dev->id[6];
1079 if (ata_id_current_chs_valid(dev->id)) {
1080 /* Current CHS translation is valid. */
1081 dev->cylinders = dev->id[54];
1082 dev->heads = dev->id[55];
1083 dev->sectors = dev->id[56];
1086 /* print device info to dmesg */
1087 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1090 ata_mode_string(xfer_modes),
1091 (unsigned long long)dev->n_sectors,
1092 (int)dev->cylinders, (int)dev->heads, (int)dev->sectors);
1099 /* ATAPI-specific feature tests */
1100 else if (dev->class == ATA_DEV_ATAPI) {
1101 if (ata_id_is_ata(dev->id)) /* sanity check */
1104 rc = atapi_cdb_len(dev->id);
1105 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1106 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1109 dev->cdb_len = (unsigned int) rc;
1111 /* print device info to dmesg */
1112 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1114 ata_mode_string(xfer_modes));
1117 ap->host->max_cmd_len = 0;
1118 for (i = 0; i < ATA_MAX_DEVICES; i++)
1119 ap->host->max_cmd_len = max_t(unsigned int,
1120 ap->host->max_cmd_len,
1121 ap->device[i].cdb_len);
1123 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1127 printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
1130 dev->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1131 DPRINTK("EXIT, err\n");
1135 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1136 struct ata_device *dev)
1138 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1142 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1149 void ata_dev_config(struct ata_port *ap, unsigned int i)
1151 /* limit bridge transfers to udma5, 200 sectors */
1152 if (ata_dev_knobble(ap, &ap->device[i])) {
1153 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1155 ap->udma_mask &= ATA_UDMA5;
1156 ap->device[i].max_sectors = ATA_MAX_SECTORS;
1159 if (ap->ops->dev_config)
1160 ap->ops->dev_config(ap, &ap->device[i]);
1164 * ata_bus_probe - Reset and probe ATA bus
1167 * Master ATA bus probing function. Initiates a hardware-dependent
1168 * bus reset, then attempts to identify any devices found on
1172 * PCI/etc. bus probe sem.
1175 * Zero on success, non-zero on error.
1178 static int ata_bus_probe(struct ata_port *ap)
1180 unsigned int i, found = 0;
1182 if (ap->ops->probe_reset) {
1183 unsigned int classes[ATA_MAX_DEVICES];
1188 rc = ap->ops->probe_reset(ap, classes);
1190 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1191 if (classes[i] == ATA_DEV_UNKNOWN)
1192 classes[i] = ATA_DEV_NONE;
1193 ap->device[i].class = classes[i];
1196 printk(KERN_ERR "ata%u: probe reset failed, "
1197 "disabling port\n", ap->id);
1198 ata_port_disable(ap);
1201 ap->ops->phy_reset(ap);
1203 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1206 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1207 ata_dev_identify(ap, i);
1208 if (ata_dev_present(&ap->device[i])) {
1210 ata_dev_config(ap,i);
1214 if ((!found) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1215 goto err_out_disable;
1218 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1219 goto err_out_disable;
1224 ap->ops->port_disable(ap);
1230 * ata_port_probe - Mark port as enabled
1231 * @ap: Port for which we indicate enablement
1233 * Modify @ap data structure such that the system
1234 * thinks that the entire port is enabled.
1236 * LOCKING: host_set lock, or some other form of
1240 void ata_port_probe(struct ata_port *ap)
1242 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1246 * sata_print_link_status - Print SATA link status
1247 * @ap: SATA port to printk link status about
1249 * This function prints link speed and status of a SATA link.
1254 static void sata_print_link_status(struct ata_port *ap)
1259 if (!ap->ops->scr_read)
1262 sstatus = scr_read(ap, SCR_STATUS);
1264 if (sata_dev_present(ap)) {
1265 tmp = (sstatus >> 4) & 0xf;
1268 else if (tmp & (1 << 1))
1271 speed = "<unknown>";
1272 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1273 ap->id, speed, sstatus);
1275 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1281 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1282 * @ap: SATA port associated with target SATA PHY.
1284 * This function issues commands to standard SATA Sxxx
1285 * PHY registers, to wake up the phy (and device), and
1286 * clear any reset condition.
1289 * PCI/etc. bus probe sem.
1292 void __sata_phy_reset(struct ata_port *ap)
1295 unsigned long timeout = jiffies + (HZ * 5);
1297 if (ap->flags & ATA_FLAG_SATA_RESET) {
1298 /* issue phy wake/reset */
1299 scr_write_flush(ap, SCR_CONTROL, 0x301);
1300 /* Couldn't find anything in SATA I/II specs, but
1301 * AHCI-1.1 10.4.2 says at least 1 ms. */
1304 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1306 /* wait for phy to become ready, if necessary */
1309 sstatus = scr_read(ap, SCR_STATUS);
1310 if ((sstatus & 0xf) != 1)
1312 } while (time_before(jiffies, timeout));
1314 /* print link status */
1315 sata_print_link_status(ap);
1317 /* TODO: phy layer with polling, timeouts, etc. */
1318 if (sata_dev_present(ap))
1321 ata_port_disable(ap);
1323 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1326 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1327 ata_port_disable(ap);
1331 ap->cbl = ATA_CBL_SATA;
1335 * sata_phy_reset - Reset SATA bus.
1336 * @ap: SATA port associated with target SATA PHY.
1338 * This function resets the SATA bus, and then probes
1339 * the bus for devices.
1342 * PCI/etc. bus probe sem.
1345 void sata_phy_reset(struct ata_port *ap)
1347 __sata_phy_reset(ap);
1348 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1354 * ata_port_disable - Disable port.
1355 * @ap: Port to be disabled.
1357 * Modify @ap data structure such that the system
1358 * thinks that the entire port is disabled, and should
1359 * never attempt to probe or communicate with devices
1362 * LOCKING: host_set lock, or some other form of
1366 void ata_port_disable(struct ata_port *ap)
1368 ap->device[0].class = ATA_DEV_NONE;
1369 ap->device[1].class = ATA_DEV_NONE;
1370 ap->flags |= ATA_FLAG_PORT_DISABLED;
1374 * This mode timing computation functionality is ported over from
1375 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1378 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1379 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1380 * for PIO 5, which is a nonstandard extension and UDMA6, which
1381 * is currently supported only by Maxtor drives.
1384 static const struct ata_timing ata_timing[] = {
1386 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1387 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1388 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1389 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1391 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1392 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1393 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1395 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1397 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1398 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1399 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1401 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1402 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1403 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1405 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1406 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1407 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1409 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1410 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1411 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1413 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1418 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1419 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1421 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1423 q->setup = EZ(t->setup * 1000, T);
1424 q->act8b = EZ(t->act8b * 1000, T);
1425 q->rec8b = EZ(t->rec8b * 1000, T);
1426 q->cyc8b = EZ(t->cyc8b * 1000, T);
1427 q->active = EZ(t->active * 1000, T);
1428 q->recover = EZ(t->recover * 1000, T);
1429 q->cycle = EZ(t->cycle * 1000, T);
1430 q->udma = EZ(t->udma * 1000, UT);
1433 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1434 struct ata_timing *m, unsigned int what)
1436 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1437 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1438 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1439 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1440 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1441 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1442 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1443 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1446 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1448 const struct ata_timing *t;
1450 for (t = ata_timing; t->mode != speed; t++)
1451 if (t->mode == 0xFF)
1456 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1457 struct ata_timing *t, int T, int UT)
1459 const struct ata_timing *s;
1460 struct ata_timing p;
1466 if (!(s = ata_timing_find_mode(speed)))
1469 memcpy(t, s, sizeof(*s));
1472 * If the drive is an EIDE drive, it can tell us it needs extended
1473 * PIO/MW_DMA cycle timing.
1476 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1477 memset(&p, 0, sizeof(p));
1478 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1479 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1480 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1481 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1482 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1484 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1488 * Convert the timing to bus clock counts.
1491 ata_timing_quantize(t, t, T, UT);
1494 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1495 * S.M.A.R.T * and some other commands. We have to ensure that the
1496 * DMA cycle timing is slower/equal than the fastest PIO timing.
1499 if (speed > XFER_PIO_4) {
1500 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1501 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1505 * Lengthen active & recovery time so that cycle time is correct.
1508 if (t->act8b + t->rec8b < t->cyc8b) {
1509 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1510 t->rec8b = t->cyc8b - t->act8b;
1513 if (t->active + t->recover < t->cycle) {
1514 t->active += (t->cycle - (t->active + t->recover)) / 2;
1515 t->recover = t->cycle - t->active;
1521 static const struct {
1524 } xfer_mode_classes[] = {
1525 { ATA_SHIFT_UDMA, XFER_UDMA_0 },
1526 { ATA_SHIFT_MWDMA, XFER_MW_DMA_0 },
1527 { ATA_SHIFT_PIO, XFER_PIO_0 },
1530 static u8 base_from_shift(unsigned int shift)
1534 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++)
1535 if (xfer_mode_classes[i].shift == shift)
1536 return xfer_mode_classes[i].base;
1541 static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1546 if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1549 if (dev->xfer_shift == ATA_SHIFT_PIO)
1550 dev->flags |= ATA_DFLAG_PIO;
1552 ata_dev_set_xfermode(ap, dev);
1554 base = base_from_shift(dev->xfer_shift);
1555 ofs = dev->xfer_mode - base;
1556 idx = ofs + dev->xfer_shift;
1557 WARN_ON(idx >= ARRAY_SIZE(xfer_mode_str));
1559 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1560 idx, dev->xfer_shift, (int)dev->xfer_mode, (int)base, ofs);
1562 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1563 ap->id, dev->devno, xfer_mode_str[idx]);
1566 static int ata_host_set_pio(struct ata_port *ap)
1572 mask = ata_get_mode_mask(ap, ATA_SHIFT_PIO);
1575 printk(KERN_WARNING "ata%u: no PIO support\n", ap->id);
1579 base = base_from_shift(ATA_SHIFT_PIO);
1580 xfer_mode = base + x;
1582 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1583 (int)base, (int)xfer_mode, mask, x);
1585 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1586 struct ata_device *dev = &ap->device[i];
1587 if (ata_dev_present(dev)) {
1588 dev->pio_mode = xfer_mode;
1589 dev->xfer_mode = xfer_mode;
1590 dev->xfer_shift = ATA_SHIFT_PIO;
1591 if (ap->ops->set_piomode)
1592 ap->ops->set_piomode(ap, dev);
1599 static void ata_host_set_dma(struct ata_port *ap, u8 xfer_mode,
1600 unsigned int xfer_shift)
1604 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1605 struct ata_device *dev = &ap->device[i];
1606 if (ata_dev_present(dev)) {
1607 dev->dma_mode = xfer_mode;
1608 dev->xfer_mode = xfer_mode;
1609 dev->xfer_shift = xfer_shift;
1610 if (ap->ops->set_dmamode)
1611 ap->ops->set_dmamode(ap, dev);
1617 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1618 * @ap: port on which timings will be programmed
1620 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1623 * PCI/etc. bus probe sem.
1625 static void ata_set_mode(struct ata_port *ap)
1627 unsigned int xfer_shift;
1631 /* step 1: always set host PIO timings */
1632 rc = ata_host_set_pio(ap);
1636 /* step 2: choose the best data xfer mode */
1637 xfer_mode = xfer_shift = 0;
1638 rc = ata_choose_xfer_mode(ap, &xfer_mode, &xfer_shift);
1642 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1643 if (xfer_shift != ATA_SHIFT_PIO)
1644 ata_host_set_dma(ap, xfer_mode, xfer_shift);
1646 /* step 4: update devices' xfer mode */
1647 ata_dev_set_mode(ap, &ap->device[0]);
1648 ata_dev_set_mode(ap, &ap->device[1]);
1650 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1653 if (ap->ops->post_set_mode)
1654 ap->ops->post_set_mode(ap);
1659 ata_port_disable(ap);
1663 * ata_tf_to_host - issue ATA taskfile to host controller
1664 * @ap: port to which command is being issued
1665 * @tf: ATA taskfile register set
1667 * Issues ATA taskfile register set to ATA host controller,
1668 * with proper synchronization with interrupt handler and
1672 * spin_lock_irqsave(host_set lock)
1675 static inline void ata_tf_to_host(struct ata_port *ap,
1676 const struct ata_taskfile *tf)
1678 ap->ops->tf_load(ap, tf);
1679 ap->ops->exec_command(ap, tf);
1683 * ata_busy_sleep - sleep until BSY clears, or timeout
1684 * @ap: port containing status register to be polled
1685 * @tmout_pat: impatience timeout
1686 * @tmout: overall timeout
1688 * Sleep until ATA Status register bit BSY clears,
1689 * or a timeout occurs.
1694 unsigned int ata_busy_sleep (struct ata_port *ap,
1695 unsigned long tmout_pat, unsigned long tmout)
1697 unsigned long timer_start, timeout;
1700 status = ata_busy_wait(ap, ATA_BUSY, 300);
1701 timer_start = jiffies;
1702 timeout = timer_start + tmout_pat;
1703 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1705 status = ata_busy_wait(ap, ATA_BUSY, 3);
1708 if (status & ATA_BUSY)
1709 printk(KERN_WARNING "ata%u is slow to respond, "
1710 "please be patient\n", ap->id);
1712 timeout = timer_start + tmout;
1713 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1715 status = ata_chk_status(ap);
1718 if (status & ATA_BUSY) {
1719 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1720 ap->id, tmout / HZ);
1727 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1729 struct ata_ioports *ioaddr = &ap->ioaddr;
1730 unsigned int dev0 = devmask & (1 << 0);
1731 unsigned int dev1 = devmask & (1 << 1);
1732 unsigned long timeout;
1734 /* if device 0 was found in ata_devchk, wait for its
1738 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1740 /* if device 1 was found in ata_devchk, wait for
1741 * register access, then wait for BSY to clear
1743 timeout = jiffies + ATA_TMOUT_BOOT;
1747 ap->ops->dev_select(ap, 1);
1748 if (ap->flags & ATA_FLAG_MMIO) {
1749 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1750 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1752 nsect = inb(ioaddr->nsect_addr);
1753 lbal = inb(ioaddr->lbal_addr);
1755 if ((nsect == 1) && (lbal == 1))
1757 if (time_after(jiffies, timeout)) {
1761 msleep(50); /* give drive a breather */
1764 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1766 /* is all this really necessary? */
1767 ap->ops->dev_select(ap, 0);
1769 ap->ops->dev_select(ap, 1);
1771 ap->ops->dev_select(ap, 0);
1775 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1776 * @ap: Port to reset and probe
1778 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1779 * probe the bus. Not often used these days.
1782 * PCI/etc. bus probe sem.
1783 * Obtains host_set lock.
1787 static unsigned int ata_bus_edd(struct ata_port *ap)
1789 struct ata_taskfile tf;
1790 unsigned long flags;
1792 /* set up execute-device-diag (bus reset) taskfile */
1793 /* also, take interrupts to a known state (disabled) */
1794 DPRINTK("execute-device-diag\n");
1795 ata_tf_init(ap, &tf, 0);
1797 tf.command = ATA_CMD_EDD;
1798 tf.protocol = ATA_PROT_NODATA;
1801 spin_lock_irqsave(&ap->host_set->lock, flags);
1802 ata_tf_to_host(ap, &tf);
1803 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1805 /* spec says at least 2ms. but who knows with those
1806 * crazy ATAPI devices...
1810 return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1813 static unsigned int ata_bus_softreset(struct ata_port *ap,
1814 unsigned int devmask)
1816 struct ata_ioports *ioaddr = &ap->ioaddr;
1818 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
1820 /* software reset. causes dev0 to be selected */
1821 if (ap->flags & ATA_FLAG_MMIO) {
1822 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1823 udelay(20); /* FIXME: flush */
1824 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
1825 udelay(20); /* FIXME: flush */
1826 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1828 outb(ap->ctl, ioaddr->ctl_addr);
1830 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
1832 outb(ap->ctl, ioaddr->ctl_addr);
1835 /* spec mandates ">= 2ms" before checking status.
1836 * We wait 150ms, because that was the magic delay used for
1837 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1838 * between when the ATA command register is written, and then
1839 * status is checked. Because waiting for "a while" before
1840 * checking status is fine, post SRST, we perform this magic
1841 * delay here as well.
1845 ata_bus_post_reset(ap, devmask);
1851 * ata_bus_reset - reset host port and associated ATA channel
1852 * @ap: port to reset
1854 * This is typically the first time we actually start issuing
1855 * commands to the ATA channel. We wait for BSY to clear, then
1856 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1857 * result. Determine what devices, if any, are on the channel
1858 * by looking at the device 0/1 error register. Look at the signature
1859 * stored in each device's taskfile registers, to determine if
1860 * the device is ATA or ATAPI.
1863 * PCI/etc. bus probe sem.
1864 * Obtains host_set lock.
1867 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1870 void ata_bus_reset(struct ata_port *ap)
1872 struct ata_ioports *ioaddr = &ap->ioaddr;
1873 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
1875 unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
1877 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
1879 /* determine if device 0/1 are present */
1880 if (ap->flags & ATA_FLAG_SATA_RESET)
1883 dev0 = ata_devchk(ap, 0);
1885 dev1 = ata_devchk(ap, 1);
1889 devmask |= (1 << 0);
1891 devmask |= (1 << 1);
1893 /* select device 0 again */
1894 ap->ops->dev_select(ap, 0);
1896 /* issue bus reset */
1897 if (ap->flags & ATA_FLAG_SRST)
1898 rc = ata_bus_softreset(ap, devmask);
1899 else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
1900 /* set up device control */
1901 if (ap->flags & ATA_FLAG_MMIO)
1902 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1904 outb(ap->ctl, ioaddr->ctl_addr);
1905 rc = ata_bus_edd(ap);
1912 * determine by signature whether we have ATA or ATAPI devices
1914 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
1915 if ((slave_possible) && (err != 0x81))
1916 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
1918 /* re-enable interrupts */
1919 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
1922 /* is double-select really necessary? */
1923 if (ap->device[1].class != ATA_DEV_NONE)
1924 ap->ops->dev_select(ap, 1);
1925 if (ap->device[0].class != ATA_DEV_NONE)
1926 ap->ops->dev_select(ap, 0);
1928 /* if no devices were detected, disable this port */
1929 if ((ap->device[0].class == ATA_DEV_NONE) &&
1930 (ap->device[1].class == ATA_DEV_NONE))
1933 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
1934 /* set up device control for ATA_FLAG_SATA_RESET */
1935 if (ap->flags & ATA_FLAG_MMIO)
1936 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1938 outb(ap->ctl, ioaddr->ctl_addr);
1945 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
1946 ap->ops->port_disable(ap);
1951 static int sata_phy_resume(struct ata_port *ap)
1953 unsigned long timeout = jiffies + (HZ * 5);
1956 scr_write_flush(ap, SCR_CONTROL, 0x300);
1958 /* Wait for phy to become ready, if necessary. */
1961 sstatus = scr_read(ap, SCR_STATUS);
1962 if ((sstatus & 0xf) != 1)
1964 } while (time_before(jiffies, timeout));
1970 * ata_std_probeinit - initialize probing
1971 * @ap: port to be probed
1973 * @ap is about to be probed. Initialize it. This function is
1974 * to be used as standard callback for ata_drive_probe_reset().
1976 * NOTE!!! Do not use this function as probeinit if a low level
1977 * driver implements only hardreset. Just pass NULL as probeinit
1978 * in that case. Using this function is probably okay but doing
1979 * so makes reset sequence different from the original
1980 * ->phy_reset implementation and Jeff nervous. :-P
1982 extern void ata_std_probeinit(struct ata_port *ap)
1984 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
1985 sata_phy_resume(ap);
1986 if (sata_dev_present(ap))
1987 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1992 * ata_std_softreset - reset host port via ATA SRST
1993 * @ap: port to reset
1994 * @verbose: fail verbosely
1995 * @classes: resulting classes of attached devices
1997 * Reset host port using ATA SRST. This function is to be used
1998 * as standard callback for ata_drive_*_reset() functions.
2001 * Kernel thread context (may sleep)
2004 * 0 on success, -errno otherwise.
2006 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
2008 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2009 unsigned int devmask = 0, err_mask;
2014 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2015 classes[0] = ATA_DEV_NONE;
2019 /* determine if device 0/1 are present */
2020 if (ata_devchk(ap, 0))
2021 devmask |= (1 << 0);
2022 if (slave_possible && ata_devchk(ap, 1))
2023 devmask |= (1 << 1);
2025 /* select device 0 again */
2026 ap->ops->dev_select(ap, 0);
2028 /* issue bus reset */
2029 DPRINTK("about to softreset, devmask=%x\n", devmask);
2030 err_mask = ata_bus_softreset(ap, devmask);
2033 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2036 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2041 /* determine by signature whether we have ATA or ATAPI devices */
2042 classes[0] = ata_dev_try_classify(ap, 0, &err);
2043 if (slave_possible && err != 0x81)
2044 classes[1] = ata_dev_try_classify(ap, 1, &err);
2047 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2052 * sata_std_hardreset - reset host port via SATA phy reset
2053 * @ap: port to reset
2054 * @verbose: fail verbosely
2055 * @class: resulting class of attached device
2057 * SATA phy-reset host port using DET bits of SControl register.
2058 * This function is to be used as standard callback for
2059 * ata_drive_*_reset().
2062 * Kernel thread context (may sleep)
2065 * 0 on success, -errno otherwise.
2067 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2071 /* Issue phy wake/reset */
2072 scr_write_flush(ap, SCR_CONTROL, 0x301);
2075 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2076 * 10.4.2 says at least 1 ms.
2080 /* Bring phy back */
2081 sata_phy_resume(ap);
2083 /* TODO: phy layer with polling, timeouts, etc. */
2084 if (!sata_dev_present(ap)) {
2085 *class = ATA_DEV_NONE;
2086 DPRINTK("EXIT, link offline\n");
2090 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2092 printk(KERN_ERR "ata%u: COMRESET failed "
2093 "(device not ready)\n", ap->id);
2095 DPRINTK("EXIT, device not ready\n");
2099 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2101 *class = ata_dev_try_classify(ap, 0, NULL);
2103 DPRINTK("EXIT, class=%u\n", *class);
2108 * ata_std_postreset - standard postreset callback
2109 * @ap: the target ata_port
2110 * @classes: classes of attached devices
2112 * This function is invoked after a successful reset. Note that
2113 * the device might have been reset more than once using
2114 * different reset methods before postreset is invoked.
2116 * This function is to be used as standard callback for
2117 * ata_drive_*_reset().
2120 * Kernel thread context (may sleep)
2122 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2126 /* set cable type if it isn't already set */
2127 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2128 ap->cbl = ATA_CBL_SATA;
2130 /* print link status */
2131 if (ap->cbl == ATA_CBL_SATA)
2132 sata_print_link_status(ap);
2134 /* re-enable interrupts */
2135 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2138 /* is double-select really necessary? */
2139 if (classes[0] != ATA_DEV_NONE)
2140 ap->ops->dev_select(ap, 1);
2141 if (classes[1] != ATA_DEV_NONE)
2142 ap->ops->dev_select(ap, 0);
2144 /* bail out if no device is present */
2145 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2146 DPRINTK("EXIT, no device\n");
2150 /* set up device control */
2151 if (ap->ioaddr.ctl_addr) {
2152 if (ap->flags & ATA_FLAG_MMIO)
2153 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2155 outb(ap->ctl, ap->ioaddr.ctl_addr);
2162 * ata_std_probe_reset - standard probe reset method
2163 * @ap: prot to perform probe-reset
2164 * @classes: resulting classes of attached devices
2166 * The stock off-the-shelf ->probe_reset method.
2169 * Kernel thread context (may sleep)
2172 * 0 on success, -errno otherwise.
2174 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2176 ata_reset_fn_t hardreset;
2179 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2180 hardreset = sata_std_hardreset;
2182 return ata_drive_probe_reset(ap, ata_std_probeinit,
2183 ata_std_softreset, hardreset,
2184 ata_std_postreset, classes);
2187 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2188 ata_postreset_fn_t postreset,
2189 unsigned int *classes)
2193 for (i = 0; i < ATA_MAX_DEVICES; i++)
2194 classes[i] = ATA_DEV_UNKNOWN;
2196 rc = reset(ap, 0, classes);
2200 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2201 * is complete and convert all ATA_DEV_UNKNOWN to
2204 for (i = 0; i < ATA_MAX_DEVICES; i++)
2205 if (classes[i] != ATA_DEV_UNKNOWN)
2208 if (i < ATA_MAX_DEVICES)
2209 for (i = 0; i < ATA_MAX_DEVICES; i++)
2210 if (classes[i] == ATA_DEV_UNKNOWN)
2211 classes[i] = ATA_DEV_NONE;
2214 postreset(ap, classes);
2216 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2220 * ata_drive_probe_reset - Perform probe reset with given methods
2221 * @ap: port to reset
2222 * @probeinit: probeinit method (can be NULL)
2223 * @softreset: softreset method (can be NULL)
2224 * @hardreset: hardreset method (can be NULL)
2225 * @postreset: postreset method (can be NULL)
2226 * @classes: resulting classes of attached devices
2228 * Reset the specified port and classify attached devices using
2229 * given methods. This function prefers softreset but tries all
2230 * possible reset sequences to reset and classify devices. This
2231 * function is intended to be used for constructing ->probe_reset
2232 * callback by low level drivers.
2234 * Reset methods should follow the following rules.
2236 * - Return 0 on sucess, -errno on failure.
2237 * - If classification is supported, fill classes[] with
2238 * recognized class codes.
2239 * - If classification is not supported, leave classes[] alone.
2240 * - If verbose is non-zero, print error message on failure;
2241 * otherwise, shut up.
2244 * Kernel thread context (may sleep)
2247 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2248 * if classification fails, and any error code from reset
2251 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2252 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2253 ata_postreset_fn_t postreset, unsigned int *classes)
2261 rc = do_probe_reset(ap, softreset, postreset, classes);
2269 rc = do_probe_reset(ap, hardreset, postreset, classes);
2270 if (rc == 0 || rc != -ENODEV)
2274 rc = do_probe_reset(ap, softreset, postreset, classes);
2279 static void ata_pr_blacklisted(const struct ata_port *ap,
2280 const struct ata_device *dev)
2282 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2283 ap->id, dev->devno);
2286 static const char * const ata_dma_blacklist [] = {
2305 "Toshiba CD-ROM XM-6202B",
2306 "TOSHIBA CD-ROM XM-1702BC",
2308 "E-IDE CD-ROM CR-840",
2311 "SAMSUNG CD-ROM SC-148C",
2312 "SAMSUNG CD-ROM SC",
2314 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2318 static int ata_dma_blacklisted(const struct ata_device *dev)
2320 unsigned char model_num[41];
2323 ata_id_c_string(dev->id, model_num, ATA_ID_PROD_OFS, sizeof(model_num));
2325 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i++)
2326 if (!strcmp(ata_dma_blacklist[i], model_num))
2332 static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift)
2334 const struct ata_device *master, *slave;
2337 master = &ap->device[0];
2338 slave = &ap->device[1];
2340 WARN_ON(!ata_dev_present(master) && !ata_dev_present(slave));
2342 if (shift == ATA_SHIFT_UDMA) {
2343 mask = ap->udma_mask;
2344 if (ata_dev_present(master)) {
2345 mask &= (master->id[ATA_ID_UDMA_MODES] & 0xff);
2346 if (ata_dma_blacklisted(master)) {
2348 ata_pr_blacklisted(ap, master);
2351 if (ata_dev_present(slave)) {
2352 mask &= (slave->id[ATA_ID_UDMA_MODES] & 0xff);
2353 if (ata_dma_blacklisted(slave)) {
2355 ata_pr_blacklisted(ap, slave);
2359 else if (shift == ATA_SHIFT_MWDMA) {
2360 mask = ap->mwdma_mask;
2361 if (ata_dev_present(master)) {
2362 mask &= (master->id[ATA_ID_MWDMA_MODES] & 0x07);
2363 if (ata_dma_blacklisted(master)) {
2365 ata_pr_blacklisted(ap, master);
2368 if (ata_dev_present(slave)) {
2369 mask &= (slave->id[ATA_ID_MWDMA_MODES] & 0x07);
2370 if (ata_dma_blacklisted(slave)) {
2372 ata_pr_blacklisted(ap, slave);
2376 else if (shift == ATA_SHIFT_PIO) {
2377 mask = ap->pio_mask;
2378 if (ata_dev_present(master)) {
2379 /* spec doesn't return explicit support for
2380 * PIO0-2, so we fake it
2382 u16 tmp_mode = master->id[ATA_ID_PIO_MODES] & 0x03;
2387 if (ata_dev_present(slave)) {
2388 /* spec doesn't return explicit support for
2389 * PIO0-2, so we fake it
2391 u16 tmp_mode = slave->id[ATA_ID_PIO_MODES] & 0x03;
2398 mask = 0xffffffff; /* shut up compiler warning */
2405 /* find greatest bit */
2406 static int fgb(u32 bitmap)
2411 for (i = 0; i < 32; i++)
2412 if (bitmap & (1 << i))
2419 * ata_choose_xfer_mode - attempt to find best transfer mode
2420 * @ap: Port for which an xfer mode will be selected
2421 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2422 * @xfer_shift_out: (output) bit shift that selects this mode
2424 * Based on host and device capabilities, determine the
2425 * maximum transfer mode that is amenable to all.
2428 * PCI/etc. bus probe sem.
2431 * Zero on success, negative on error.
2434 static int ata_choose_xfer_mode(const struct ata_port *ap,
2436 unsigned int *xfer_shift_out)
2438 unsigned int mask, shift;
2441 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++) {
2442 shift = xfer_mode_classes[i].shift;
2443 mask = ata_get_mode_mask(ap, shift);
2447 *xfer_mode_out = xfer_mode_classes[i].base + x;
2448 *xfer_shift_out = shift;
2457 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2458 * @ap: Port associated with device @dev
2459 * @dev: Device to which command will be sent
2461 * Issue SET FEATURES - XFER MODE command to device @dev
2465 * PCI/etc. bus probe sem.
2468 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
2470 struct ata_taskfile tf;
2472 /* set up set-features taskfile */
2473 DPRINTK("set features - xfer mode\n");
2475 ata_tf_init(ap, &tf, dev->devno);
2476 tf.command = ATA_CMD_SET_FEATURES;
2477 tf.feature = SETFEATURES_XFER;
2478 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2479 tf.protocol = ATA_PROT_NODATA;
2480 tf.nsect = dev->xfer_mode;
2482 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2483 printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
2485 ata_port_disable(ap);
2492 * ata_dev_reread_id - Reread the device identify device info
2493 * @ap: port where the device is
2494 * @dev: device to reread the identify device info
2499 static void ata_dev_reread_id(struct ata_port *ap, struct ata_device *dev)
2501 struct ata_taskfile tf;
2503 ata_tf_init(ap, &tf, dev->devno);
2505 if (dev->class == ATA_DEV_ATA) {
2506 tf.command = ATA_CMD_ID_ATA;
2507 DPRINTK("do ATA identify\n");
2509 tf.command = ATA_CMD_ID_ATAPI;
2510 DPRINTK("do ATAPI identify\n");
2513 tf.flags |= ATA_TFLAG_DEVICE;
2514 tf.protocol = ATA_PROT_PIO;
2516 if (ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
2517 dev->id, sizeof(dev->id)))
2520 swap_buf_le16(dev->id, ATA_ID_WORDS);
2522 ata_dump_id(dev->id);
2528 printk(KERN_ERR "ata%u: failed to reread ID, disabled\n", ap->id);
2529 ata_port_disable(ap);
2533 * ata_dev_init_params - Issue INIT DEV PARAMS command
2534 * @ap: Port associated with device @dev
2535 * @dev: Device to which command will be sent
2538 * Kernel thread context (may sleep)
2541 * 0 on success, AC_ERR_* mask otherwise.
2544 static unsigned int ata_dev_init_params(struct ata_port *ap,
2545 struct ata_device *dev)
2547 struct ata_taskfile tf;
2548 unsigned int err_mask;
2549 u16 sectors = dev->id[6];
2550 u16 heads = dev->id[3];
2552 /* Number of sectors per track 1-255. Number of heads 1-16 */
2553 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2556 /* set up init dev params taskfile */
2557 DPRINTK("init dev params \n");
2559 ata_tf_init(ap, &tf, dev->devno);
2560 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2561 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2562 tf.protocol = ATA_PROT_NODATA;
2564 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2566 err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2568 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2573 * ata_sg_clean - Unmap DMA memory associated with command
2574 * @qc: Command containing DMA memory to be released
2576 * Unmap all mapped DMA memory associated with this command.
2579 * spin_lock_irqsave(host_set lock)
2582 static void ata_sg_clean(struct ata_queued_cmd *qc)
2584 struct ata_port *ap = qc->ap;
2585 struct scatterlist *sg = qc->__sg;
2586 int dir = qc->dma_dir;
2587 void *pad_buf = NULL;
2589 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2590 WARN_ON(sg == NULL);
2592 if (qc->flags & ATA_QCFLAG_SINGLE)
2593 WARN_ON(qc->n_elem > 1);
2595 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2597 /* if we padded the buffer out to 32-bit bound, and data
2598 * xfer direction is from-device, we must copy from the
2599 * pad buffer back into the supplied buffer
2601 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2602 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2604 if (qc->flags & ATA_QCFLAG_SG) {
2606 dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
2607 /* restore last sg */
2608 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2610 struct scatterlist *psg = &qc->pad_sgent;
2611 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2612 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2613 kunmap_atomic(addr, KM_IRQ0);
2617 dma_unmap_single(ap->host_set->dev,
2618 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2621 sg->length += qc->pad_len;
2623 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2624 pad_buf, qc->pad_len);
2627 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2632 * ata_fill_sg - Fill PCI IDE PRD table
2633 * @qc: Metadata associated with taskfile to be transferred
2635 * Fill PCI IDE PRD (scatter-gather) table with segments
2636 * associated with the current disk command.
2639 * spin_lock_irqsave(host_set lock)
2642 static void ata_fill_sg(struct ata_queued_cmd *qc)
2644 struct ata_port *ap = qc->ap;
2645 struct scatterlist *sg;
2648 WARN_ON(qc->__sg == NULL);
2649 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
2652 ata_for_each_sg(sg, qc) {
2656 /* determine if physical DMA addr spans 64K boundary.
2657 * Note h/w doesn't support 64-bit, so we unconditionally
2658 * truncate dma_addr_t to u32.
2660 addr = (u32) sg_dma_address(sg);
2661 sg_len = sg_dma_len(sg);
2664 offset = addr & 0xffff;
2666 if ((offset + sg_len) > 0x10000)
2667 len = 0x10000 - offset;
2669 ap->prd[idx].addr = cpu_to_le32(addr);
2670 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2671 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2680 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2683 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2684 * @qc: Metadata associated with taskfile to check
2686 * Allow low-level driver to filter ATA PACKET commands, returning
2687 * a status indicating whether or not it is OK to use DMA for the
2688 * supplied PACKET command.
2691 * spin_lock_irqsave(host_set lock)
2693 * RETURNS: 0 when ATAPI DMA can be used
2696 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2698 struct ata_port *ap = qc->ap;
2699 int rc = 0; /* Assume ATAPI DMA is OK by default */
2701 if (ap->ops->check_atapi_dma)
2702 rc = ap->ops->check_atapi_dma(qc);
2707 * ata_qc_prep - Prepare taskfile for submission
2708 * @qc: Metadata associated with taskfile to be prepared
2710 * Prepare ATA taskfile for submission.
2713 * spin_lock_irqsave(host_set lock)
2715 void ata_qc_prep(struct ata_queued_cmd *qc)
2717 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2724 * ata_sg_init_one - Associate command with memory buffer
2725 * @qc: Command to be associated
2726 * @buf: Memory buffer
2727 * @buflen: Length of memory buffer, in bytes.
2729 * Initialize the data-related elements of queued_cmd @qc
2730 * to point to a single memory buffer, @buf of byte length @buflen.
2733 * spin_lock_irqsave(host_set lock)
2736 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2738 struct scatterlist *sg;
2740 qc->flags |= ATA_QCFLAG_SINGLE;
2742 memset(&qc->sgent, 0, sizeof(qc->sgent));
2743 qc->__sg = &qc->sgent;
2745 qc->orig_n_elem = 1;
2749 sg_init_one(sg, buf, buflen);
2753 * ata_sg_init - Associate command with scatter-gather table.
2754 * @qc: Command to be associated
2755 * @sg: Scatter-gather table.
2756 * @n_elem: Number of elements in s/g table.
2758 * Initialize the data-related elements of queued_cmd @qc
2759 * to point to a scatter-gather table @sg, containing @n_elem
2763 * spin_lock_irqsave(host_set lock)
2766 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2767 unsigned int n_elem)
2769 qc->flags |= ATA_QCFLAG_SG;
2771 qc->n_elem = n_elem;
2772 qc->orig_n_elem = n_elem;
2776 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2777 * @qc: Command with memory buffer to be mapped.
2779 * DMA-map the memory buffer associated with queued_cmd @qc.
2782 * spin_lock_irqsave(host_set lock)
2785 * Zero on success, negative on error.
2788 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
2790 struct ata_port *ap = qc->ap;
2791 int dir = qc->dma_dir;
2792 struct scatterlist *sg = qc->__sg;
2793 dma_addr_t dma_address;
2796 /* we must lengthen transfers to end on a 32-bit boundary */
2797 qc->pad_len = sg->length & 3;
2799 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2800 struct scatterlist *psg = &qc->pad_sgent;
2802 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2804 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2806 if (qc->tf.flags & ATA_TFLAG_WRITE)
2807 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
2810 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2811 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2813 sg->length -= qc->pad_len;
2814 if (sg->length == 0)
2817 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2818 sg->length, qc->pad_len);
2826 dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
2828 if (dma_mapping_error(dma_address)) {
2830 sg->length += qc->pad_len;
2834 sg_dma_address(sg) = dma_address;
2835 sg_dma_len(sg) = sg->length;
2838 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
2839 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
2845 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2846 * @qc: Command with scatter-gather table to be mapped.
2848 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2851 * spin_lock_irqsave(host_set lock)
2854 * Zero on success, negative on error.
2858 static int ata_sg_setup(struct ata_queued_cmd *qc)
2860 struct ata_port *ap = qc->ap;
2861 struct scatterlist *sg = qc->__sg;
2862 struct scatterlist *lsg = &sg[qc->n_elem - 1];
2863 int n_elem, pre_n_elem, dir, trim_sg = 0;
2865 VPRINTK("ENTER, ata%u\n", ap->id);
2866 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
2868 /* we must lengthen transfers to end on a 32-bit boundary */
2869 qc->pad_len = lsg->length & 3;
2871 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2872 struct scatterlist *psg = &qc->pad_sgent;
2873 unsigned int offset;
2875 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2877 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2880 * psg->page/offset are used to copy to-be-written
2881 * data in this function or read data in ata_sg_clean.
2883 offset = lsg->offset + lsg->length - qc->pad_len;
2884 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
2885 psg->offset = offset_in_page(offset);
2887 if (qc->tf.flags & ATA_TFLAG_WRITE) {
2888 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2889 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
2890 kunmap_atomic(addr, KM_IRQ0);
2893 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2894 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2896 lsg->length -= qc->pad_len;
2897 if (lsg->length == 0)
2900 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2901 qc->n_elem - 1, lsg->length, qc->pad_len);
2904 pre_n_elem = qc->n_elem;
2905 if (trim_sg && pre_n_elem)
2914 n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
2916 /* restore last sg */
2917 lsg->length += qc->pad_len;
2921 DPRINTK("%d sg elements mapped\n", n_elem);
2924 qc->n_elem = n_elem;
2930 * ata_poll_qc_complete - turn irq back on and finish qc
2931 * @qc: Command to complete
2932 * @err_mask: ATA status register content
2935 * None. (grabs host lock)
2938 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
2940 struct ata_port *ap = qc->ap;
2941 unsigned long flags;
2943 spin_lock_irqsave(&ap->host_set->lock, flags);
2944 ap->flags &= ~ATA_FLAG_NOINTR;
2946 ata_qc_complete(qc);
2947 spin_unlock_irqrestore(&ap->host_set->lock, flags);
2951 * ata_pio_poll - poll using PIO, depending on current state
2952 * @ap: the target ata_port
2955 * None. (executing in kernel thread context)
2958 * timeout value to use
2961 static unsigned long ata_pio_poll(struct ata_port *ap)
2963 struct ata_queued_cmd *qc;
2965 unsigned int poll_state = HSM_ST_UNKNOWN;
2966 unsigned int reg_state = HSM_ST_UNKNOWN;
2968 qc = ata_qc_from_tag(ap, ap->active_tag);
2969 WARN_ON(qc == NULL);
2971 switch (ap->hsm_task_state) {
2974 poll_state = HSM_ST_POLL;
2978 case HSM_ST_LAST_POLL:
2979 poll_state = HSM_ST_LAST_POLL;
2980 reg_state = HSM_ST_LAST;
2987 status = ata_chk_status(ap);
2988 if (status & ATA_BUSY) {
2989 if (time_after(jiffies, ap->pio_task_timeout)) {
2990 qc->err_mask |= AC_ERR_TIMEOUT;
2991 ap->hsm_task_state = HSM_ST_TMOUT;
2994 ap->hsm_task_state = poll_state;
2995 return ATA_SHORT_PAUSE;
2998 ap->hsm_task_state = reg_state;
3003 * ata_pio_complete - check if drive is busy or idle
3004 * @ap: the target ata_port
3007 * None. (executing in kernel thread context)
3010 * Non-zero if qc completed, zero otherwise.
3013 static int ata_pio_complete (struct ata_port *ap)
3015 struct ata_queued_cmd *qc;
3019 * This is purely heuristic. This is a fast path. Sometimes when
3020 * we enter, BSY will be cleared in a chk-status or two. If not,
3021 * the drive is probably seeking or something. Snooze for a couple
3022 * msecs, then chk-status again. If still busy, fall back to
3023 * HSM_ST_POLL state.
3025 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3026 if (drv_stat & ATA_BUSY) {
3028 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3029 if (drv_stat & ATA_BUSY) {
3030 ap->hsm_task_state = HSM_ST_LAST_POLL;
3031 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3036 qc = ata_qc_from_tag(ap, ap->active_tag);
3037 WARN_ON(qc == NULL);
3039 drv_stat = ata_wait_idle(ap);
3040 if (!ata_ok(drv_stat)) {
3041 qc->err_mask |= __ac_err_mask(drv_stat);
3042 ap->hsm_task_state = HSM_ST_ERR;
3046 ap->hsm_task_state = HSM_ST_IDLE;
3048 WARN_ON(qc->err_mask);
3049 ata_poll_qc_complete(qc);
3051 /* another command may start at this point */
3058 * swap_buf_le16 - swap halves of 16-bit words in place
3059 * @buf: Buffer to swap
3060 * @buf_words: Number of 16-bit words in buffer.
3062 * Swap halves of 16-bit words if needed to convert from
3063 * little-endian byte order to native cpu byte order, or
3067 * Inherited from caller.
3069 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3074 for (i = 0; i < buf_words; i++)
3075 buf[i] = le16_to_cpu(buf[i]);
3076 #endif /* __BIG_ENDIAN */
3080 * ata_mmio_data_xfer - Transfer data by MMIO
3081 * @ap: port to read/write
3083 * @buflen: buffer length
3084 * @write_data: read/write
3086 * Transfer data from/to the device data register by MMIO.
3089 * Inherited from caller.
3092 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3093 unsigned int buflen, int write_data)
3096 unsigned int words = buflen >> 1;
3097 u16 *buf16 = (u16 *) buf;
3098 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3100 /* Transfer multiple of 2 bytes */
3102 for (i = 0; i < words; i++)
3103 writew(le16_to_cpu(buf16[i]), mmio);
3105 for (i = 0; i < words; i++)
3106 buf16[i] = cpu_to_le16(readw(mmio));
3109 /* Transfer trailing 1 byte, if any. */
3110 if (unlikely(buflen & 0x01)) {
3111 u16 align_buf[1] = { 0 };
3112 unsigned char *trailing_buf = buf + buflen - 1;
3115 memcpy(align_buf, trailing_buf, 1);
3116 writew(le16_to_cpu(align_buf[0]), mmio);
3118 align_buf[0] = cpu_to_le16(readw(mmio));
3119 memcpy(trailing_buf, align_buf, 1);
3125 * ata_pio_data_xfer - Transfer data by PIO
3126 * @ap: port to read/write
3128 * @buflen: buffer length
3129 * @write_data: read/write
3131 * Transfer data from/to the device data register by PIO.
3134 * Inherited from caller.
3137 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3138 unsigned int buflen, int write_data)
3140 unsigned int words = buflen >> 1;
3142 /* Transfer multiple of 2 bytes */
3144 outsw(ap->ioaddr.data_addr, buf, words);
3146 insw(ap->ioaddr.data_addr, buf, words);
3148 /* Transfer trailing 1 byte, if any. */
3149 if (unlikely(buflen & 0x01)) {
3150 u16 align_buf[1] = { 0 };
3151 unsigned char *trailing_buf = buf + buflen - 1;
3154 memcpy(align_buf, trailing_buf, 1);
3155 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3157 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3158 memcpy(trailing_buf, align_buf, 1);
3164 * ata_data_xfer - Transfer data from/to the data register.
3165 * @ap: port to read/write
3167 * @buflen: buffer length
3168 * @do_write: read/write
3170 * Transfer data from/to the device data register.
3173 * Inherited from caller.
3176 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3177 unsigned int buflen, int do_write)
3179 /* Make the crap hardware pay the costs not the good stuff */
3180 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3181 unsigned long flags;
3182 local_irq_save(flags);
3183 if (ap->flags & ATA_FLAG_MMIO)
3184 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3186 ata_pio_data_xfer(ap, buf, buflen, do_write);
3187 local_irq_restore(flags);
3189 if (ap->flags & ATA_FLAG_MMIO)
3190 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3192 ata_pio_data_xfer(ap, buf, buflen, do_write);
3197 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3198 * @qc: Command on going
3200 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3203 * Inherited from caller.
3206 static void ata_pio_sector(struct ata_queued_cmd *qc)
3208 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3209 struct scatterlist *sg = qc->__sg;
3210 struct ata_port *ap = qc->ap;
3212 unsigned int offset;
3215 if (qc->cursect == (qc->nsect - 1))
3216 ap->hsm_task_state = HSM_ST_LAST;
3218 page = sg[qc->cursg].page;
3219 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3221 /* get the current page and offset */
3222 page = nth_page(page, (offset >> PAGE_SHIFT));
3223 offset %= PAGE_SIZE;
3225 buf = kmap(page) + offset;
3230 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3235 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3237 /* do the actual data transfer */
3238 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3239 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3245 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3246 * @qc: Command on going
3247 * @bytes: number of bytes
3249 * Transfer Transfer data from/to the ATAPI device.
3252 * Inherited from caller.
3256 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3258 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3259 struct scatterlist *sg = qc->__sg;
3260 struct ata_port *ap = qc->ap;
3263 unsigned int offset, count;
3265 if (qc->curbytes + bytes >= qc->nbytes)
3266 ap->hsm_task_state = HSM_ST_LAST;
3269 if (unlikely(qc->cursg >= qc->n_elem)) {
3271 * The end of qc->sg is reached and the device expects
3272 * more data to transfer. In order not to overrun qc->sg
3273 * and fulfill length specified in the byte count register,
3274 * - for read case, discard trailing data from the device
3275 * - for write case, padding zero data to the device
3277 u16 pad_buf[1] = { 0 };
3278 unsigned int words = bytes >> 1;
3281 if (words) /* warning if bytes > 1 */
3282 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3285 for (i = 0; i < words; i++)
3286 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3288 ap->hsm_task_state = HSM_ST_LAST;
3292 sg = &qc->__sg[qc->cursg];
3295 offset = sg->offset + qc->cursg_ofs;
3297 /* get the current page and offset */
3298 page = nth_page(page, (offset >> PAGE_SHIFT));
3299 offset %= PAGE_SIZE;
3301 /* don't overrun current sg */
3302 count = min(sg->length - qc->cursg_ofs, bytes);
3304 /* don't cross page boundaries */
3305 count = min(count, (unsigned int)PAGE_SIZE - offset);
3307 buf = kmap(page) + offset;
3310 qc->curbytes += count;
3311 qc->cursg_ofs += count;
3313 if (qc->cursg_ofs == sg->length) {
3318 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3320 /* do the actual data transfer */
3321 ata_data_xfer(ap, buf, count, do_write);
3330 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3331 * @qc: Command on going
3333 * Transfer Transfer data from/to the ATAPI device.
3336 * Inherited from caller.
3339 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3341 struct ata_port *ap = qc->ap;
3342 struct ata_device *dev = qc->dev;
3343 unsigned int ireason, bc_lo, bc_hi, bytes;
3344 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3346 ap->ops->tf_read(ap, &qc->tf);
3347 ireason = qc->tf.nsect;
3348 bc_lo = qc->tf.lbam;
3349 bc_hi = qc->tf.lbah;
3350 bytes = (bc_hi << 8) | bc_lo;
3352 /* shall be cleared to zero, indicating xfer of data */
3353 if (ireason & (1 << 0))
3356 /* make sure transfer direction matches expected */
3357 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3358 if (do_write != i_write)
3361 __atapi_pio_bytes(qc, bytes);
3366 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3367 ap->id, dev->devno);
3368 qc->err_mask |= AC_ERR_HSM;
3369 ap->hsm_task_state = HSM_ST_ERR;
3373 * ata_pio_block - start PIO on a block
3374 * @ap: the target ata_port
3377 * None. (executing in kernel thread context)
3380 static void ata_pio_block(struct ata_port *ap)
3382 struct ata_queued_cmd *qc;
3386 * This is purely heuristic. This is a fast path.
3387 * Sometimes when we enter, BSY will be cleared in
3388 * a chk-status or two. If not, the drive is probably seeking
3389 * or something. Snooze for a couple msecs, then
3390 * chk-status again. If still busy, fall back to
3391 * HSM_ST_POLL state.
3393 status = ata_busy_wait(ap, ATA_BUSY, 5);
3394 if (status & ATA_BUSY) {
3396 status = ata_busy_wait(ap, ATA_BUSY, 10);
3397 if (status & ATA_BUSY) {
3398 ap->hsm_task_state = HSM_ST_POLL;
3399 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3404 qc = ata_qc_from_tag(ap, ap->active_tag);
3405 WARN_ON(qc == NULL);
3408 if (status & (ATA_ERR | ATA_DF)) {
3409 qc->err_mask |= AC_ERR_DEV;
3410 ap->hsm_task_state = HSM_ST_ERR;
3414 /* transfer data if any */
3415 if (is_atapi_taskfile(&qc->tf)) {
3416 /* DRQ=0 means no more data to transfer */
3417 if ((status & ATA_DRQ) == 0) {
3418 ap->hsm_task_state = HSM_ST_LAST;
3422 atapi_pio_bytes(qc);
3424 /* handle BSY=0, DRQ=0 as error */
3425 if ((status & ATA_DRQ) == 0) {
3426 qc->err_mask |= AC_ERR_HSM;
3427 ap->hsm_task_state = HSM_ST_ERR;
3435 static void ata_pio_error(struct ata_port *ap)
3437 struct ata_queued_cmd *qc;
3439 qc = ata_qc_from_tag(ap, ap->active_tag);
3440 WARN_ON(qc == NULL);
3442 if (qc->tf.command != ATA_CMD_PACKET)
3443 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3445 /* make sure qc->err_mask is available to
3446 * know what's wrong and recover
3448 WARN_ON(qc->err_mask == 0);
3450 ap->hsm_task_state = HSM_ST_IDLE;
3452 ata_poll_qc_complete(qc);
3455 static void ata_pio_task(void *_data)
3457 struct ata_port *ap = _data;
3458 unsigned long timeout;
3465 switch (ap->hsm_task_state) {
3474 qc_completed = ata_pio_complete(ap);
3478 case HSM_ST_LAST_POLL:
3479 timeout = ata_pio_poll(ap);
3489 ata_queue_delayed_pio_task(ap, timeout);
3490 else if (!qc_completed)
3495 * ata_qc_timeout - Handle timeout of queued command
3496 * @qc: Command that timed out
3498 * Some part of the kernel (currently, only the SCSI layer)
3499 * has noticed that the active command on port @ap has not
3500 * completed after a specified length of time. Handle this
3501 * condition by disabling DMA (if necessary) and completing
3502 * transactions, with error if necessary.
3504 * This also handles the case of the "lost interrupt", where
3505 * for some reason (possibly hardware bug, possibly driver bug)
3506 * an interrupt was not delivered to the driver, even though the
3507 * transaction completed successfully.
3510 * Inherited from SCSI layer (none, can sleep)
3513 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3515 struct ata_port *ap = qc->ap;
3516 struct ata_host_set *host_set = ap->host_set;
3517 u8 host_stat = 0, drv_stat;
3518 unsigned long flags;
3522 ata_flush_pio_tasks(ap);
3523 ap->hsm_task_state = HSM_ST_IDLE;
3525 spin_lock_irqsave(&host_set->lock, flags);
3527 switch (qc->tf.protocol) {
3530 case ATA_PROT_ATAPI_DMA:
3531 host_stat = ap->ops->bmdma_status(ap);
3533 /* before we do anything else, clear DMA-Start bit */
3534 ap->ops->bmdma_stop(qc);
3540 drv_stat = ata_chk_status(ap);
3542 /* ack bmdma irq events */
3543 ap->ops->irq_clear(ap);
3545 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3546 ap->id, qc->tf.command, drv_stat, host_stat);
3548 /* complete taskfile transaction */
3549 qc->err_mask |= ac_err_mask(drv_stat);
3553 spin_unlock_irqrestore(&host_set->lock, flags);
3555 ata_eh_qc_complete(qc);
3561 * ata_eng_timeout - Handle timeout of queued command
3562 * @ap: Port on which timed-out command is active
3564 * Some part of the kernel (currently, only the SCSI layer)
3565 * has noticed that the active command on port @ap has not
3566 * completed after a specified length of time. Handle this
3567 * condition by disabling DMA (if necessary) and completing
3568 * transactions, with error if necessary.
3570 * This also handles the case of the "lost interrupt", where
3571 * for some reason (possibly hardware bug, possibly driver bug)
3572 * an interrupt was not delivered to the driver, even though the
3573 * transaction completed successfully.
3576 * Inherited from SCSI layer (none, can sleep)
3579 void ata_eng_timeout(struct ata_port *ap)
3583 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3589 * ata_qc_new - Request an available ATA command, for queueing
3590 * @ap: Port associated with device @dev
3591 * @dev: Device from whom we request an available command structure
3597 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3599 struct ata_queued_cmd *qc = NULL;
3602 for (i = 0; i < ATA_MAX_QUEUE; i++)
3603 if (!test_and_set_bit(i, &ap->qactive)) {
3604 qc = ata_qc_from_tag(ap, i);
3615 * ata_qc_new_init - Request an available ATA command, and initialize it
3616 * @ap: Port associated with device @dev
3617 * @dev: Device from whom we request an available command structure
3623 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3624 struct ata_device *dev)
3626 struct ata_queued_cmd *qc;
3628 qc = ata_qc_new(ap);
3641 * ata_qc_free - free unused ata_queued_cmd
3642 * @qc: Command to complete
3644 * Designed to free unused ata_queued_cmd object
3645 * in case something prevents using it.
3648 * spin_lock_irqsave(host_set lock)
3650 void ata_qc_free(struct ata_queued_cmd *qc)
3652 struct ata_port *ap = qc->ap;
3655 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3659 if (likely(ata_tag_valid(tag))) {
3660 if (tag == ap->active_tag)
3661 ap->active_tag = ATA_TAG_POISON;
3662 qc->tag = ATA_TAG_POISON;
3663 clear_bit(tag, &ap->qactive);
3667 void __ata_qc_complete(struct ata_queued_cmd *qc)
3669 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3670 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3672 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3675 /* atapi: mark qc as inactive to prevent the interrupt handler
3676 * from completing the command twice later, before the error handler
3677 * is called. (when rc != 0 and atapi request sense is needed)
3679 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3681 /* call completion callback */
3682 qc->complete_fn(qc);
3685 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3687 struct ata_port *ap = qc->ap;
3689 switch (qc->tf.protocol) {
3691 case ATA_PROT_ATAPI_DMA:
3694 case ATA_PROT_ATAPI:
3696 case ATA_PROT_PIO_MULT:
3697 if (ap->flags & ATA_FLAG_PIO_DMA)
3710 * ata_qc_issue - issue taskfile to device
3711 * @qc: command to issue to device
3713 * Prepare an ATA command to submission to device.
3714 * This includes mapping the data into a DMA-able
3715 * area, filling in the S/G table, and finally
3716 * writing the taskfile to hardware, starting the command.
3719 * spin_lock_irqsave(host_set lock)
3722 * Zero on success, AC_ERR_* mask on failure
3725 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
3727 struct ata_port *ap = qc->ap;
3729 if (ata_should_dma_map(qc)) {
3730 if (qc->flags & ATA_QCFLAG_SG) {
3731 if (ata_sg_setup(qc))
3733 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
3734 if (ata_sg_setup_one(qc))
3738 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3741 ap->ops->qc_prep(qc);
3743 qc->ap->active_tag = qc->tag;
3744 qc->flags |= ATA_QCFLAG_ACTIVE;
3746 return ap->ops->qc_issue(qc);
3749 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3750 return AC_ERR_SYSTEM;
3755 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3756 * @qc: command to issue to device
3758 * Using various libata functions and hooks, this function
3759 * starts an ATA command. ATA commands are grouped into
3760 * classes called "protocols", and issuing each type of protocol
3761 * is slightly different.
3763 * May be used as the qc_issue() entry in ata_port_operations.
3766 * spin_lock_irqsave(host_set lock)
3769 * Zero on success, AC_ERR_* mask on failure
3772 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
3774 struct ata_port *ap = qc->ap;
3776 ata_dev_select(ap, qc->dev->devno, 1, 0);
3778 switch (qc->tf.protocol) {
3779 case ATA_PROT_NODATA:
3780 ata_tf_to_host(ap, &qc->tf);
3784 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
3785 ap->ops->bmdma_setup(qc); /* set up bmdma */
3786 ap->ops->bmdma_start(qc); /* initiate bmdma */
3789 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
3790 ata_qc_set_polling(qc);
3791 ata_tf_to_host(ap, &qc->tf);
3792 ap->hsm_task_state = HSM_ST;
3793 ata_queue_pio_task(ap);
3796 case ATA_PROT_ATAPI:
3797 ata_qc_set_polling(qc);
3798 ata_tf_to_host(ap, &qc->tf);
3799 ata_queue_packet_task(ap);
3802 case ATA_PROT_ATAPI_NODATA:
3803 ap->flags |= ATA_FLAG_NOINTR;
3804 ata_tf_to_host(ap, &qc->tf);
3805 ata_queue_packet_task(ap);
3808 case ATA_PROT_ATAPI_DMA:
3809 ap->flags |= ATA_FLAG_NOINTR;
3810 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
3811 ap->ops->bmdma_setup(qc); /* set up bmdma */
3812 ata_queue_packet_task(ap);
3817 return AC_ERR_SYSTEM;
3824 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3825 * @qc: Info associated with this ATA transaction.
3828 * spin_lock_irqsave(host_set lock)
3831 static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
3833 struct ata_port *ap = qc->ap;
3834 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
3836 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
3838 /* load PRD table addr. */
3839 mb(); /* make sure PRD table writes are visible to controller */
3840 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
3842 /* specify data direction, triple-check start bit is clear */
3843 dmactl = readb(mmio + ATA_DMA_CMD);
3844 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
3846 dmactl |= ATA_DMA_WR;
3847 writeb(dmactl, mmio + ATA_DMA_CMD);
3849 /* issue r/w command */
3850 ap->ops->exec_command(ap, &qc->tf);
3854 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3855 * @qc: Info associated with this ATA transaction.
3858 * spin_lock_irqsave(host_set lock)
3861 static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
3863 struct ata_port *ap = qc->ap;
3864 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
3867 /* start host DMA transaction */
3868 dmactl = readb(mmio + ATA_DMA_CMD);
3869 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
3871 /* Strictly, one may wish to issue a readb() here, to
3872 * flush the mmio write. However, control also passes
3873 * to the hardware at this point, and it will interrupt
3874 * us when we are to resume control. So, in effect,
3875 * we don't care when the mmio write flushes.
3876 * Further, a read of the DMA status register _immediately_
3877 * following the write may not be what certain flaky hardware
3878 * is expected, so I think it is best to not add a readb()
3879 * without first all the MMIO ATA cards/mobos.
3880 * Or maybe I'm just being paranoid.
3885 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3886 * @qc: Info associated with this ATA transaction.
3889 * spin_lock_irqsave(host_set lock)
3892 static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
3894 struct ata_port *ap = qc->ap;
3895 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
3898 /* load PRD table addr. */
3899 outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
3901 /* specify data direction, triple-check start bit is clear */
3902 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3903 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
3905 dmactl |= ATA_DMA_WR;
3906 outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3908 /* issue r/w command */
3909 ap->ops->exec_command(ap, &qc->tf);
3913 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3914 * @qc: Info associated with this ATA transaction.
3917 * spin_lock_irqsave(host_set lock)
3920 static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
3922 struct ata_port *ap = qc->ap;
3925 /* start host DMA transaction */
3926 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3927 outb(dmactl | ATA_DMA_START,
3928 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3933 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3934 * @qc: Info associated with this ATA transaction.
3936 * Writes the ATA_DMA_START flag to the DMA command register.
3938 * May be used as the bmdma_start() entry in ata_port_operations.
3941 * spin_lock_irqsave(host_set lock)
3943 void ata_bmdma_start(struct ata_queued_cmd *qc)
3945 if (qc->ap->flags & ATA_FLAG_MMIO)
3946 ata_bmdma_start_mmio(qc);
3948 ata_bmdma_start_pio(qc);
3953 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3954 * @qc: Info associated with this ATA transaction.
3956 * Writes address of PRD table to device's PRD Table Address
3957 * register, sets the DMA control register, and calls
3958 * ops->exec_command() to start the transfer.
3960 * May be used as the bmdma_setup() entry in ata_port_operations.
3963 * spin_lock_irqsave(host_set lock)
3965 void ata_bmdma_setup(struct ata_queued_cmd *qc)
3967 if (qc->ap->flags & ATA_FLAG_MMIO)
3968 ata_bmdma_setup_mmio(qc);
3970 ata_bmdma_setup_pio(qc);
3975 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3976 * @ap: Port associated with this ATA transaction.
3978 * Clear interrupt and error flags in DMA status register.
3980 * May be used as the irq_clear() entry in ata_port_operations.
3983 * spin_lock_irqsave(host_set lock)
3986 void ata_bmdma_irq_clear(struct ata_port *ap)
3988 if (ap->flags & ATA_FLAG_MMIO) {
3989 void __iomem *mmio = ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
3990 writeb(readb(mmio), mmio);
3992 unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
3993 outb(inb(addr), addr);
4000 * ata_bmdma_status - Read PCI IDE BMDMA status
4001 * @ap: Port associated with this ATA transaction.
4003 * Read and return BMDMA status register.
4005 * May be used as the bmdma_status() entry in ata_port_operations.
4008 * spin_lock_irqsave(host_set lock)
4011 u8 ata_bmdma_status(struct ata_port *ap)
4014 if (ap->flags & ATA_FLAG_MMIO) {
4015 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4016 host_stat = readb(mmio + ATA_DMA_STATUS);
4018 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
4024 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4025 * @qc: Command we are ending DMA for
4027 * Clears the ATA_DMA_START flag in the dma control register
4029 * May be used as the bmdma_stop() entry in ata_port_operations.
4032 * spin_lock_irqsave(host_set lock)
4035 void ata_bmdma_stop(struct ata_queued_cmd *qc)
4037 struct ata_port *ap = qc->ap;
4038 if (ap->flags & ATA_FLAG_MMIO) {
4039 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4041 /* clear start/stop bit */
4042 writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
4043 mmio + ATA_DMA_CMD);
4045 /* clear start/stop bit */
4046 outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
4047 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4050 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4051 ata_altstatus(ap); /* dummy read */
4055 * ata_host_intr - Handle host interrupt for given (port, task)
4056 * @ap: Port on which interrupt arrived (possibly...)
4057 * @qc: Taskfile currently active in engine
4059 * Handle host interrupt for given queued command. Currently,
4060 * only DMA interrupts are handled. All other commands are
4061 * handled via polling with interrupts disabled (nIEN bit).
4064 * spin_lock_irqsave(host_set lock)
4067 * One if interrupt was handled, zero if not (shared irq).
4070 inline unsigned int ata_host_intr (struct ata_port *ap,
4071 struct ata_queued_cmd *qc)
4073 u8 status, host_stat;
4075 switch (qc->tf.protocol) {
4078 case ATA_PROT_ATAPI_DMA:
4079 case ATA_PROT_ATAPI:
4080 /* check status of DMA engine */
4081 host_stat = ap->ops->bmdma_status(ap);
4082 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4084 /* if it's not our irq... */
4085 if (!(host_stat & ATA_DMA_INTR))
4088 /* before we do anything else, clear DMA-Start bit */
4089 ap->ops->bmdma_stop(qc);
4093 case ATA_PROT_ATAPI_NODATA:
4094 case ATA_PROT_NODATA:
4095 /* check altstatus */
4096 status = ata_altstatus(ap);
4097 if (status & ATA_BUSY)
4100 /* check main status, clearing INTRQ */
4101 status = ata_chk_status(ap);
4102 if (unlikely(status & ATA_BUSY))
4104 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4105 ap->id, qc->tf.protocol, status);
4107 /* ack bmdma irq events */
4108 ap->ops->irq_clear(ap);
4110 /* complete taskfile transaction */
4111 qc->err_mask |= ac_err_mask(status);
4112 ata_qc_complete(qc);
4119 return 1; /* irq handled */
4122 ap->stats.idle_irq++;
4125 if ((ap->stats.idle_irq % 1000) == 0) {
4127 ata_irq_ack(ap, 0); /* debug trap */
4128 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4131 return 0; /* irq not handled */
4135 * ata_interrupt - Default ATA host interrupt handler
4136 * @irq: irq line (unused)
4137 * @dev_instance: pointer to our ata_host_set information structure
4140 * Default interrupt handler for PCI IDE devices. Calls
4141 * ata_host_intr() for each port that is not disabled.
4144 * Obtains host_set lock during operation.
4147 * IRQ_NONE or IRQ_HANDLED.
4150 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4152 struct ata_host_set *host_set = dev_instance;
4154 unsigned int handled = 0;
4155 unsigned long flags;
4157 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4158 spin_lock_irqsave(&host_set->lock, flags);
4160 for (i = 0; i < host_set->n_ports; i++) {
4161 struct ata_port *ap;
4163 ap = host_set->ports[i];
4165 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4166 struct ata_queued_cmd *qc;
4168 qc = ata_qc_from_tag(ap, ap->active_tag);
4169 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4170 (qc->flags & ATA_QCFLAG_ACTIVE))
4171 handled |= ata_host_intr(ap, qc);
4175 spin_unlock_irqrestore(&host_set->lock, flags);
4177 return IRQ_RETVAL(handled);
4181 * atapi_packet_task - Write CDB bytes to hardware
4182 * @_data: Port to which ATAPI device is attached.
4184 * When device has indicated its readiness to accept
4185 * a CDB, this function is called. Send the CDB.
4186 * If DMA is to be performed, exit immediately.
4187 * Otherwise, we are in polling mode, so poll
4188 * status under operation succeeds or fails.
4191 * Kernel thread context (may sleep)
4194 static void atapi_packet_task(void *_data)
4196 struct ata_port *ap = _data;
4197 struct ata_queued_cmd *qc;
4200 qc = ata_qc_from_tag(ap, ap->active_tag);
4201 WARN_ON(qc == NULL);
4202 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4204 /* sleep-wait for BSY to clear */
4205 DPRINTK("busy wait\n");
4206 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
4207 qc->err_mask |= AC_ERR_TIMEOUT;
4211 /* make sure DRQ is set */
4212 status = ata_chk_status(ap);
4213 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
4214 qc->err_mask |= AC_ERR_HSM;
4219 DPRINTK("send cdb\n");
4220 WARN_ON(qc->dev->cdb_len < 12);
4222 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
4223 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
4224 unsigned long flags;
4226 /* Once we're done issuing command and kicking bmdma,
4227 * irq handler takes over. To not lose irq, we need
4228 * to clear NOINTR flag before sending cdb, but
4229 * interrupt handler shouldn't be invoked before we're
4230 * finished. Hence, the following locking.
4232 spin_lock_irqsave(&ap->host_set->lock, flags);
4233 ap->flags &= ~ATA_FLAG_NOINTR;
4234 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
4235 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
4236 ap->ops->bmdma_start(qc); /* initiate bmdma */
4237 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4239 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
4241 /* PIO commands are handled by polling */
4242 ap->hsm_task_state = HSM_ST;
4243 ata_queue_pio_task(ap);
4249 ata_poll_qc_complete(qc);
4254 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4255 * without filling any other registers
4257 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4260 struct ata_taskfile tf;
4263 ata_tf_init(ap, &tf, dev->devno);
4266 tf.flags |= ATA_TFLAG_DEVICE;
4267 tf.protocol = ATA_PROT_NODATA;
4269 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4271 printk(KERN_ERR "%s: ata command failed: %d\n",
4277 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4281 if (!ata_try_flush_cache(dev))
4284 if (ata_id_has_flush_ext(dev->id))
4285 cmd = ATA_CMD_FLUSH_EXT;
4287 cmd = ATA_CMD_FLUSH;
4289 return ata_do_simple_cmd(ap, dev, cmd);
4292 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4294 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4297 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4299 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4303 * ata_device_resume - wakeup a previously suspended devices
4304 * @ap: port the device is connected to
4305 * @dev: the device to resume
4307 * Kick the drive back into action, by sending it an idle immediate
4308 * command and making sure its transfer mode matches between drive
4312 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4314 if (ap->flags & ATA_FLAG_SUSPENDED) {
4315 ap->flags &= ~ATA_FLAG_SUSPENDED;
4318 if (!ata_dev_present(dev))
4320 if (dev->class == ATA_DEV_ATA)
4321 ata_start_drive(ap, dev);
4327 * ata_device_suspend - prepare a device for suspend
4328 * @ap: port the device is connected to
4329 * @dev: the device to suspend
4331 * Flush the cache on the drive, if appropriate, then issue a
4332 * standbynow command.
4334 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
4336 if (!ata_dev_present(dev))
4338 if (dev->class == ATA_DEV_ATA)
4339 ata_flush_cache(ap, dev);
4341 ata_standby_drive(ap, dev);
4342 ap->flags |= ATA_FLAG_SUSPENDED;
4347 * ata_port_start - Set port up for dma.
4348 * @ap: Port to initialize
4350 * Called just after data structures for each port are
4351 * initialized. Allocates space for PRD table.
4353 * May be used as the port_start() entry in ata_port_operations.
4356 * Inherited from caller.
4359 int ata_port_start (struct ata_port *ap)
4361 struct device *dev = ap->host_set->dev;
4364 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4368 rc = ata_pad_alloc(ap, dev);
4370 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4374 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4381 * ata_port_stop - Undo ata_port_start()
4382 * @ap: Port to shut down
4384 * Frees the PRD table.
4386 * May be used as the port_stop() entry in ata_port_operations.
4389 * Inherited from caller.
4392 void ata_port_stop (struct ata_port *ap)
4394 struct device *dev = ap->host_set->dev;
4396 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4397 ata_pad_free(ap, dev);
4400 void ata_host_stop (struct ata_host_set *host_set)
4402 if (host_set->mmio_base)
4403 iounmap(host_set->mmio_base);
4408 * ata_host_remove - Unregister SCSI host structure with upper layers
4409 * @ap: Port to unregister
4410 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4413 * Inherited from caller.
4416 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4418 struct Scsi_Host *sh = ap->host;
4423 scsi_remove_host(sh);
4425 ap->ops->port_stop(ap);
4429 * ata_host_init - Initialize an ata_port structure
4430 * @ap: Structure to initialize
4431 * @host: associated SCSI mid-layer structure
4432 * @host_set: Collection of hosts to which @ap belongs
4433 * @ent: Probe information provided by low-level driver
4434 * @port_no: Port number associated with this ata_port
4436 * Initialize a new ata_port structure, and its associated
4440 * Inherited from caller.
4443 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4444 struct ata_host_set *host_set,
4445 const struct ata_probe_ent *ent, unsigned int port_no)
4451 host->max_channel = 1;
4452 host->unique_id = ata_unique_id++;
4453 host->max_cmd_len = 12;
4455 ap->flags = ATA_FLAG_PORT_DISABLED;
4456 ap->id = host->unique_id;
4458 ap->ctl = ATA_DEVCTL_OBS;
4459 ap->host_set = host_set;
4460 ap->port_no = port_no;
4462 ent->legacy_mode ? ent->hard_port_no : port_no;
4463 ap->pio_mask = ent->pio_mask;
4464 ap->mwdma_mask = ent->mwdma_mask;
4465 ap->udma_mask = ent->udma_mask;
4466 ap->flags |= ent->host_flags;
4467 ap->ops = ent->port_ops;
4468 ap->cbl = ATA_CBL_NONE;
4469 ap->active_tag = ATA_TAG_POISON;
4470 ap->last_ctl = 0xFF;
4472 INIT_WORK(&ap->packet_task, atapi_packet_task, ap);
4473 INIT_WORK(&ap->pio_task, ata_pio_task, ap);
4474 INIT_LIST_HEAD(&ap->eh_done_q);
4476 for (i = 0; i < ATA_MAX_DEVICES; i++)
4477 ap->device[i].devno = i;
4480 ap->stats.unhandled_irq = 1;
4481 ap->stats.idle_irq = 1;
4484 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4488 * ata_host_add - Attach low-level ATA driver to system
4489 * @ent: Information provided by low-level driver
4490 * @host_set: Collections of ports to which we add
4491 * @port_no: Port number associated with this host
4493 * Attach low-level ATA driver to system.
4496 * PCI/etc. bus probe sem.
4499 * New ata_port on success, for NULL on error.
4502 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4503 struct ata_host_set *host_set,
4504 unsigned int port_no)
4506 struct Scsi_Host *host;
4507 struct ata_port *ap;
4511 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4515 ap = (struct ata_port *) &host->hostdata[0];
4517 ata_host_init(ap, host, host_set, ent, port_no);
4519 rc = ap->ops->port_start(ap);
4526 scsi_host_put(host);
4531 * ata_device_add - Register hardware device with ATA and SCSI layers
4532 * @ent: Probe information describing hardware device to be registered
4534 * This function processes the information provided in the probe
4535 * information struct @ent, allocates the necessary ATA and SCSI
4536 * host information structures, initializes them, and registers
4537 * everything with requisite kernel subsystems.
4539 * This function requests irqs, probes the ATA bus, and probes
4543 * PCI/etc. bus probe sem.
4546 * Number of ports registered. Zero on error (no ports registered).
4549 int ata_device_add(const struct ata_probe_ent *ent)
4551 unsigned int count = 0, i;
4552 struct device *dev = ent->dev;
4553 struct ata_host_set *host_set;
4556 /* alloc a container for our list of ATA ports (buses) */
4557 host_set = kzalloc(sizeof(struct ata_host_set) +
4558 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4561 spin_lock_init(&host_set->lock);
4563 host_set->dev = dev;
4564 host_set->n_ports = ent->n_ports;
4565 host_set->irq = ent->irq;
4566 host_set->mmio_base = ent->mmio_base;
4567 host_set->private_data = ent->private_data;
4568 host_set->ops = ent->port_ops;
4570 /* register each port bound to this device */
4571 for (i = 0; i < ent->n_ports; i++) {
4572 struct ata_port *ap;
4573 unsigned long xfer_mode_mask;
4575 ap = ata_host_add(ent, host_set, i);
4579 host_set->ports[i] = ap;
4580 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4581 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4582 (ap->pio_mask << ATA_SHIFT_PIO);
4584 /* print per-port info to dmesg */
4585 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4586 "bmdma 0x%lX irq %lu\n",
4588 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4589 ata_mode_string(xfer_mode_mask),
4590 ap->ioaddr.cmd_addr,
4591 ap->ioaddr.ctl_addr,
4592 ap->ioaddr.bmdma_addr,
4596 host_set->ops->irq_clear(ap);
4603 /* obtain irq, that is shared between channels */
4604 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4605 DRV_NAME, host_set))
4608 /* perform each probe synchronously */
4609 DPRINTK("probe begin\n");
4610 for (i = 0; i < count; i++) {
4611 struct ata_port *ap;
4614 ap = host_set->ports[i];
4616 DPRINTK("ata%u: bus probe begin\n", ap->id);
4617 rc = ata_bus_probe(ap);
4618 DPRINTK("ata%u: bus probe end\n", ap->id);
4621 /* FIXME: do something useful here?
4622 * Current libata behavior will
4623 * tear down everything when
4624 * the module is removed
4625 * or the h/w is unplugged.
4629 rc = scsi_add_host(ap->host, dev);
4631 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4633 /* FIXME: do something useful here */
4634 /* FIXME: handle unconditional calls to
4635 * scsi_scan_host and ata_host_remove, below,
4641 /* probes are done, now scan each port's disk(s) */
4642 DPRINTK("host probe begin\n");
4643 for (i = 0; i < count; i++) {
4644 struct ata_port *ap = host_set->ports[i];
4646 ata_scsi_scan_host(ap);
4649 dev_set_drvdata(dev, host_set);
4651 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4652 return ent->n_ports; /* success */
4655 for (i = 0; i < count; i++) {
4656 ata_host_remove(host_set->ports[i], 1);
4657 scsi_host_put(host_set->ports[i]->host);
4661 VPRINTK("EXIT, returning 0\n");
4666 * ata_host_set_remove - PCI layer callback for device removal
4667 * @host_set: ATA host set that was removed
4669 * Unregister all objects associated with this host set. Free those
4673 * Inherited from calling layer (may sleep).
4676 void ata_host_set_remove(struct ata_host_set *host_set)
4678 struct ata_port *ap;
4681 for (i = 0; i < host_set->n_ports; i++) {
4682 ap = host_set->ports[i];
4683 scsi_remove_host(ap->host);
4686 free_irq(host_set->irq, host_set);
4688 for (i = 0; i < host_set->n_ports; i++) {
4689 ap = host_set->ports[i];
4691 ata_scsi_release(ap->host);
4693 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4694 struct ata_ioports *ioaddr = &ap->ioaddr;
4696 if (ioaddr->cmd_addr == 0x1f0)
4697 release_region(0x1f0, 8);
4698 else if (ioaddr->cmd_addr == 0x170)
4699 release_region(0x170, 8);
4702 scsi_host_put(ap->host);
4705 if (host_set->ops->host_stop)
4706 host_set->ops->host_stop(host_set);
4712 * ata_scsi_release - SCSI layer callback hook for host unload
4713 * @host: libata host to be unloaded
4715 * Performs all duties necessary to shut down a libata port...
4716 * Kill port kthread, disable port, and release resources.
4719 * Inherited from SCSI layer.
4725 int ata_scsi_release(struct Scsi_Host *host)
4727 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4731 ap->ops->port_disable(ap);
4732 ata_host_remove(ap, 0);
4739 * ata_std_ports - initialize ioaddr with standard port offsets.
4740 * @ioaddr: IO address structure to be initialized
4742 * Utility function which initializes data_addr, error_addr,
4743 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4744 * device_addr, status_addr, and command_addr to standard offsets
4745 * relative to cmd_addr.
4747 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4750 void ata_std_ports(struct ata_ioports *ioaddr)
4752 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4753 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4754 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4755 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4756 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4757 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4758 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4759 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4760 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4761 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4767 void ata_pci_host_stop (struct ata_host_set *host_set)
4769 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4771 pci_iounmap(pdev, host_set->mmio_base);
4775 * ata_pci_remove_one - PCI layer callback for device removal
4776 * @pdev: PCI device that was removed
4778 * PCI layer indicates to libata via this hook that
4779 * hot-unplug or module unload event has occurred.
4780 * Handle this by unregistering all objects associated
4781 * with this PCI device. Free those objects. Then finally
4782 * release PCI resources and disable device.
4785 * Inherited from PCI layer (may sleep).
4788 void ata_pci_remove_one (struct pci_dev *pdev)
4790 struct device *dev = pci_dev_to_dev(pdev);
4791 struct ata_host_set *host_set = dev_get_drvdata(dev);
4793 ata_host_set_remove(host_set);
4794 pci_release_regions(pdev);
4795 pci_disable_device(pdev);
4796 dev_set_drvdata(dev, NULL);
4799 /* move to PCI subsystem */
4800 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4802 unsigned long tmp = 0;
4804 switch (bits->width) {
4807 pci_read_config_byte(pdev, bits->reg, &tmp8);
4813 pci_read_config_word(pdev, bits->reg, &tmp16);
4819 pci_read_config_dword(pdev, bits->reg, &tmp32);
4830 return (tmp == bits->val) ? 1 : 0;
4833 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4835 pci_save_state(pdev);
4836 pci_disable_device(pdev);
4837 pci_set_power_state(pdev, PCI_D3hot);
4841 int ata_pci_device_resume(struct pci_dev *pdev)
4843 pci_set_power_state(pdev, PCI_D0);
4844 pci_restore_state(pdev);
4845 pci_enable_device(pdev);
4846 pci_set_master(pdev);
4849 #endif /* CONFIG_PCI */
4852 static int __init ata_init(void)
4854 ata_wq = create_workqueue("ata");
4858 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4862 static void __exit ata_exit(void)
4864 destroy_workqueue(ata_wq);
4867 module_init(ata_init);
4868 module_exit(ata_exit);
4870 static unsigned long ratelimit_time;
4871 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4873 int ata_ratelimit(void)
4876 unsigned long flags;
4878 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4880 if (time_after(jiffies, ratelimit_time)) {
4882 ratelimit_time = jiffies + (HZ/5);
4886 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4892 * libata is essentially a library of internal helper functions for
4893 * low-level ATA host controller drivers. As such, the API/ABI is
4894 * likely to change as new drivers are added and updated.
4895 * Do not depend on ABI/API stability.
4898 EXPORT_SYMBOL_GPL(ata_std_bios_param);
4899 EXPORT_SYMBOL_GPL(ata_std_ports);
4900 EXPORT_SYMBOL_GPL(ata_device_add);
4901 EXPORT_SYMBOL_GPL(ata_host_set_remove);
4902 EXPORT_SYMBOL_GPL(ata_sg_init);
4903 EXPORT_SYMBOL_GPL(ata_sg_init_one);
4904 EXPORT_SYMBOL_GPL(__ata_qc_complete);
4905 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4906 EXPORT_SYMBOL_GPL(ata_eng_timeout);
4907 EXPORT_SYMBOL_GPL(ata_tf_load);
4908 EXPORT_SYMBOL_GPL(ata_tf_read);
4909 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4910 EXPORT_SYMBOL_GPL(ata_std_dev_select);
4911 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4912 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4913 EXPORT_SYMBOL_GPL(ata_check_status);
4914 EXPORT_SYMBOL_GPL(ata_altstatus);
4915 EXPORT_SYMBOL_GPL(ata_exec_command);
4916 EXPORT_SYMBOL_GPL(ata_port_start);
4917 EXPORT_SYMBOL_GPL(ata_port_stop);
4918 EXPORT_SYMBOL_GPL(ata_host_stop);
4919 EXPORT_SYMBOL_GPL(ata_interrupt);
4920 EXPORT_SYMBOL_GPL(ata_qc_prep);
4921 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4922 EXPORT_SYMBOL_GPL(ata_bmdma_start);
4923 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4924 EXPORT_SYMBOL_GPL(ata_bmdma_status);
4925 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4926 EXPORT_SYMBOL_GPL(ata_port_probe);
4927 EXPORT_SYMBOL_GPL(sata_phy_reset);
4928 EXPORT_SYMBOL_GPL(__sata_phy_reset);
4929 EXPORT_SYMBOL_GPL(ata_bus_reset);
4930 EXPORT_SYMBOL_GPL(ata_std_probeinit);
4931 EXPORT_SYMBOL_GPL(ata_std_softreset);
4932 EXPORT_SYMBOL_GPL(sata_std_hardreset);
4933 EXPORT_SYMBOL_GPL(ata_std_postreset);
4934 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
4935 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
4936 EXPORT_SYMBOL_GPL(ata_port_disable);
4937 EXPORT_SYMBOL_GPL(ata_ratelimit);
4938 EXPORT_SYMBOL_GPL(ata_busy_sleep);
4939 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
4940 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4941 EXPORT_SYMBOL_GPL(ata_scsi_timed_out);
4942 EXPORT_SYMBOL_GPL(ata_scsi_error);
4943 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
4944 EXPORT_SYMBOL_GPL(ata_scsi_release);
4945 EXPORT_SYMBOL_GPL(ata_host_intr);
4946 EXPORT_SYMBOL_GPL(ata_dev_classify);
4947 EXPORT_SYMBOL_GPL(ata_id_string);
4948 EXPORT_SYMBOL_GPL(ata_id_c_string);
4949 EXPORT_SYMBOL_GPL(ata_dev_config);
4950 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
4951 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
4952 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
4954 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
4955 EXPORT_SYMBOL_GPL(ata_timing_compute);
4956 EXPORT_SYMBOL_GPL(ata_timing_merge);
4959 EXPORT_SYMBOL_GPL(pci_test_config_bits);
4960 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
4961 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
4962 EXPORT_SYMBOL_GPL(ata_pci_init_one);
4963 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
4964 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
4965 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
4966 #endif /* CONFIG_PCI */
4968 EXPORT_SYMBOL_GPL(ata_device_suspend);
4969 EXPORT_SYMBOL_GPL(ata_device_resume);
4970 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
4971 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);