2 * libata-bmdma.c - helper library for PCI IDE BMDMA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2006 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2006 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/kernel.h>
36 #include <linux/pci.h>
37 #include <linux/libata.h>
42 * ata_tf_load_pio - send taskfile registers to host controller
43 * @ap: Port to which output is sent
44 * @tf: ATA taskfile register set
46 * Outputs ATA taskfile to standard ATA host controller.
49 * Inherited from caller.
52 static void ata_tf_load_pio(struct ata_port *ap, const struct ata_taskfile *tf)
54 struct ata_ioports *ioaddr = &ap->ioaddr;
55 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
57 if (tf->ctl != ap->last_ctl) {
58 outb(tf->ctl, ioaddr->ctl_addr);
59 ap->last_ctl = tf->ctl;
63 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
64 outb(tf->hob_feature, ioaddr->feature_addr);
65 outb(tf->hob_nsect, ioaddr->nsect_addr);
66 outb(tf->hob_lbal, ioaddr->lbal_addr);
67 outb(tf->hob_lbam, ioaddr->lbam_addr);
68 outb(tf->hob_lbah, ioaddr->lbah_addr);
69 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
78 outb(tf->feature, ioaddr->feature_addr);
79 outb(tf->nsect, ioaddr->nsect_addr);
80 outb(tf->lbal, ioaddr->lbal_addr);
81 outb(tf->lbam, ioaddr->lbam_addr);
82 outb(tf->lbah, ioaddr->lbah_addr);
83 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
91 if (tf->flags & ATA_TFLAG_DEVICE) {
92 outb(tf->device, ioaddr->device_addr);
93 VPRINTK("device 0x%X\n", tf->device);
100 * ata_tf_load_mmio - send taskfile registers to host controller
101 * @ap: Port to which output is sent
102 * @tf: ATA taskfile register set
104 * Outputs ATA taskfile to standard ATA host controller using MMIO.
107 * Inherited from caller.
110 static void ata_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
112 struct ata_ioports *ioaddr = &ap->ioaddr;
113 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
115 if (tf->ctl != ap->last_ctl) {
116 writeb(tf->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
117 ap->last_ctl = tf->ctl;
121 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
122 writeb(tf->hob_feature, (void __iomem *) ioaddr->feature_addr);
123 writeb(tf->hob_nsect, (void __iomem *) ioaddr->nsect_addr);
124 writeb(tf->hob_lbal, (void __iomem *) ioaddr->lbal_addr);
125 writeb(tf->hob_lbam, (void __iomem *) ioaddr->lbam_addr);
126 writeb(tf->hob_lbah, (void __iomem *) ioaddr->lbah_addr);
127 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
136 writeb(tf->feature, (void __iomem *) ioaddr->feature_addr);
137 writeb(tf->nsect, (void __iomem *) ioaddr->nsect_addr);
138 writeb(tf->lbal, (void __iomem *) ioaddr->lbal_addr);
139 writeb(tf->lbam, (void __iomem *) ioaddr->lbam_addr);
140 writeb(tf->lbah, (void __iomem *) ioaddr->lbah_addr);
141 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
149 if (tf->flags & ATA_TFLAG_DEVICE) {
150 writeb(tf->device, (void __iomem *) ioaddr->device_addr);
151 VPRINTK("device 0x%X\n", tf->device);
159 * ata_tf_load - send taskfile registers to host controller
160 * @ap: Port to which output is sent
161 * @tf: ATA taskfile register set
163 * Outputs ATA taskfile to standard ATA host controller using MMIO
164 * or PIO as indicated by the ATA_FLAG_MMIO flag.
165 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
166 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
167 * hob_lbal, hob_lbam, and hob_lbah.
169 * This function waits for idle (!BUSY and !DRQ) after writing
170 * registers. If the control register has a new value, this
171 * function also waits for idle after writing control and before
172 * writing the remaining registers.
174 * May be used as the tf_load() entry in ata_port_operations.
177 * Inherited from caller.
179 void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
181 if (ap->flags & ATA_FLAG_MMIO)
182 ata_tf_load_mmio(ap, tf);
184 ata_tf_load_pio(ap, tf);
188 * ata_exec_command_pio - issue ATA command to host controller
189 * @ap: port to which command is being issued
190 * @tf: ATA taskfile register set
192 * Issues PIO write to ATA command register, with proper
193 * synchronization with interrupt handler / other threads.
196 * spin_lock_irqsave(host lock)
199 static void ata_exec_command_pio(struct ata_port *ap, const struct ata_taskfile *tf)
201 DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
203 outb(tf->command, ap->ioaddr.command_addr);
209 * ata_exec_command_mmio - issue ATA command to host controller
210 * @ap: port to which command is being issued
211 * @tf: ATA taskfile register set
213 * Issues MMIO write to ATA command register, with proper
214 * synchronization with interrupt handler / other threads.
216 * FIXME: missing write posting for 400nS delay enforcement
219 * spin_lock_irqsave(host lock)
222 static void ata_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
224 DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
226 writeb(tf->command, (void __iomem *) ap->ioaddr.command_addr);
232 * ata_exec_command - issue ATA command to host controller
233 * @ap: port to which command is being issued
234 * @tf: ATA taskfile register set
236 * Issues PIO/MMIO write to ATA command register, with proper
237 * synchronization with interrupt handler / other threads.
240 * spin_lock_irqsave(host lock)
242 void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf)
244 if (ap->flags & ATA_FLAG_MMIO)
245 ata_exec_command_mmio(ap, tf);
247 ata_exec_command_pio(ap, tf);
251 * ata_tf_read_pio - input device's ATA taskfile shadow registers
252 * @ap: Port from which input is read
253 * @tf: ATA taskfile register set for storing input
255 * Reads ATA taskfile registers for currently-selected device
259 * Inherited from caller.
262 static void ata_tf_read_pio(struct ata_port *ap, struct ata_taskfile *tf)
264 struct ata_ioports *ioaddr = &ap->ioaddr;
266 tf->command = ata_check_status(ap);
267 tf->feature = inb(ioaddr->error_addr);
268 tf->nsect = inb(ioaddr->nsect_addr);
269 tf->lbal = inb(ioaddr->lbal_addr);
270 tf->lbam = inb(ioaddr->lbam_addr);
271 tf->lbah = inb(ioaddr->lbah_addr);
272 tf->device = inb(ioaddr->device_addr);
274 if (tf->flags & ATA_TFLAG_LBA48) {
275 outb(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
276 tf->hob_feature = inb(ioaddr->error_addr);
277 tf->hob_nsect = inb(ioaddr->nsect_addr);
278 tf->hob_lbal = inb(ioaddr->lbal_addr);
279 tf->hob_lbam = inb(ioaddr->lbam_addr);
280 tf->hob_lbah = inb(ioaddr->lbah_addr);
285 * ata_tf_read_mmio - input device's ATA taskfile shadow registers
286 * @ap: Port from which input is read
287 * @tf: ATA taskfile register set for storing input
289 * Reads ATA taskfile registers for currently-selected device
293 * Inherited from caller.
296 static void ata_tf_read_mmio(struct ata_port *ap, struct ata_taskfile *tf)
298 struct ata_ioports *ioaddr = &ap->ioaddr;
300 tf->command = ata_check_status(ap);
301 tf->feature = readb((void __iomem *)ioaddr->error_addr);
302 tf->nsect = readb((void __iomem *)ioaddr->nsect_addr);
303 tf->lbal = readb((void __iomem *)ioaddr->lbal_addr);
304 tf->lbam = readb((void __iomem *)ioaddr->lbam_addr);
305 tf->lbah = readb((void __iomem *)ioaddr->lbah_addr);
306 tf->device = readb((void __iomem *)ioaddr->device_addr);
308 if (tf->flags & ATA_TFLAG_LBA48) {
309 writeb(tf->ctl | ATA_HOB, (void __iomem *) ap->ioaddr.ctl_addr);
310 tf->hob_feature = readb((void __iomem *)ioaddr->error_addr);
311 tf->hob_nsect = readb((void __iomem *)ioaddr->nsect_addr);
312 tf->hob_lbal = readb((void __iomem *)ioaddr->lbal_addr);
313 tf->hob_lbam = readb((void __iomem *)ioaddr->lbam_addr);
314 tf->hob_lbah = readb((void __iomem *)ioaddr->lbah_addr);
320 * ata_tf_read - input device's ATA taskfile shadow registers
321 * @ap: Port from which input is read
322 * @tf: ATA taskfile register set for storing input
324 * Reads ATA taskfile registers for currently-selected device
327 * Reads nsect, lbal, lbam, lbah, and device. If ATA_TFLAG_LBA48
328 * is set, also reads the hob registers.
330 * May be used as the tf_read() entry in ata_port_operations.
333 * Inherited from caller.
335 void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
337 if (ap->flags & ATA_FLAG_MMIO)
338 ata_tf_read_mmio(ap, tf);
340 ata_tf_read_pio(ap, tf);
344 * ata_check_status_pio - Read device status reg & clear interrupt
345 * @ap: port where the device is
347 * Reads ATA taskfile status register for currently-selected device
348 * and return its value. This also clears pending interrupts
352 * Inherited from caller.
354 static u8 ata_check_status_pio(struct ata_port *ap)
356 return inb(ap->ioaddr.status_addr);
360 * ata_check_status_mmio - Read device status reg & clear interrupt
361 * @ap: port where the device is
363 * Reads ATA taskfile status register for currently-selected device
364 * via MMIO and return its value. This also clears pending interrupts
368 * Inherited from caller.
370 static u8 ata_check_status_mmio(struct ata_port *ap)
372 return readb((void __iomem *) ap->ioaddr.status_addr);
377 * ata_check_status - Read device status reg & clear interrupt
378 * @ap: port where the device is
380 * Reads ATA taskfile status register for currently-selected device
381 * and return its value. This also clears pending interrupts
384 * May be used as the check_status() entry in ata_port_operations.
387 * Inherited from caller.
389 u8 ata_check_status(struct ata_port *ap)
391 if (ap->flags & ATA_FLAG_MMIO)
392 return ata_check_status_mmio(ap);
393 return ata_check_status_pio(ap);
398 * ata_altstatus - Read device alternate status reg
399 * @ap: port where the device is
401 * Reads ATA taskfile alternate status register for
402 * currently-selected device and return its value.
404 * Note: may NOT be used as the check_altstatus() entry in
405 * ata_port_operations.
408 * Inherited from caller.
410 u8 ata_altstatus(struct ata_port *ap)
412 if (ap->ops->check_altstatus)
413 return ap->ops->check_altstatus(ap);
415 if (ap->flags & ATA_FLAG_MMIO)
416 return readb((void __iomem *)ap->ioaddr.altstatus_addr);
417 return inb(ap->ioaddr.altstatus_addr);
421 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
422 * @qc: Info associated with this ATA transaction.
425 * spin_lock_irqsave(host lock)
428 static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
430 struct ata_port *ap = qc->ap;
431 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
433 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
435 /* load PRD table addr. */
436 mb(); /* make sure PRD table writes are visible to controller */
437 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
439 /* specify data direction, triple-check start bit is clear */
440 dmactl = readb(mmio + ATA_DMA_CMD);
441 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
443 dmactl |= ATA_DMA_WR;
444 writeb(dmactl, mmio + ATA_DMA_CMD);
446 /* issue r/w command */
447 ap->ops->exec_command(ap, &qc->tf);
451 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
452 * @qc: Info associated with this ATA transaction.
455 * spin_lock_irqsave(host lock)
458 static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
460 struct ata_port *ap = qc->ap;
461 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
464 /* start host DMA transaction */
465 dmactl = readb(mmio + ATA_DMA_CMD);
466 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
468 /* Strictly, one may wish to issue a readb() here, to
469 * flush the mmio write. However, control also passes
470 * to the hardware at this point, and it will interrupt
471 * us when we are to resume control. So, in effect,
472 * we don't care when the mmio write flushes.
473 * Further, a read of the DMA status register _immediately_
474 * following the write may not be what certain flaky hardware
475 * is expected, so I think it is best to not add a readb()
476 * without first all the MMIO ATA cards/mobos.
477 * Or maybe I'm just being paranoid.
482 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
483 * @qc: Info associated with this ATA transaction.
486 * spin_lock_irqsave(host lock)
489 static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
491 struct ata_port *ap = qc->ap;
492 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
495 /* load PRD table addr. */
496 outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
498 /* specify data direction, triple-check start bit is clear */
499 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
500 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
502 dmactl |= ATA_DMA_WR;
503 outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
505 /* issue r/w command */
506 ap->ops->exec_command(ap, &qc->tf);
510 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
511 * @qc: Info associated with this ATA transaction.
514 * spin_lock_irqsave(host lock)
517 static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
519 struct ata_port *ap = qc->ap;
522 /* start host DMA transaction */
523 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
524 outb(dmactl | ATA_DMA_START,
525 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
530 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
531 * @qc: Info associated with this ATA transaction.
533 * Writes the ATA_DMA_START flag to the DMA command register.
535 * May be used as the bmdma_start() entry in ata_port_operations.
538 * spin_lock_irqsave(host lock)
540 void ata_bmdma_start(struct ata_queued_cmd *qc)
542 if (qc->ap->flags & ATA_FLAG_MMIO)
543 ata_bmdma_start_mmio(qc);
545 ata_bmdma_start_pio(qc);
550 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
551 * @qc: Info associated with this ATA transaction.
553 * Writes address of PRD table to device's PRD Table Address
554 * register, sets the DMA control register, and calls
555 * ops->exec_command() to start the transfer.
557 * May be used as the bmdma_setup() entry in ata_port_operations.
560 * spin_lock_irqsave(host lock)
562 void ata_bmdma_setup(struct ata_queued_cmd *qc)
564 if (qc->ap->flags & ATA_FLAG_MMIO)
565 ata_bmdma_setup_mmio(qc);
567 ata_bmdma_setup_pio(qc);
572 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
573 * @ap: Port associated with this ATA transaction.
575 * Clear interrupt and error flags in DMA status register.
577 * May be used as the irq_clear() entry in ata_port_operations.
580 * spin_lock_irqsave(host lock)
583 void ata_bmdma_irq_clear(struct ata_port *ap)
585 if (!ap->ioaddr.bmdma_addr)
588 if (ap->flags & ATA_FLAG_MMIO) {
590 ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
591 writeb(readb(mmio), mmio);
593 unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
594 outb(inb(addr), addr);
600 * ata_bmdma_status - Read PCI IDE BMDMA status
601 * @ap: Port associated with this ATA transaction.
603 * Read and return BMDMA status register.
605 * May be used as the bmdma_status() entry in ata_port_operations.
608 * spin_lock_irqsave(host lock)
611 u8 ata_bmdma_status(struct ata_port *ap)
614 if (ap->flags & ATA_FLAG_MMIO) {
615 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
616 host_stat = readb(mmio + ATA_DMA_STATUS);
618 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
624 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
625 * @qc: Command we are ending DMA for
627 * Clears the ATA_DMA_START flag in the dma control register
629 * May be used as the bmdma_stop() entry in ata_port_operations.
632 * spin_lock_irqsave(host lock)
635 void ata_bmdma_stop(struct ata_queued_cmd *qc)
637 struct ata_port *ap = qc->ap;
638 if (ap->flags & ATA_FLAG_MMIO) {
639 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
641 /* clear start/stop bit */
642 writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
645 /* clear start/stop bit */
646 outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
647 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
650 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
651 ata_altstatus(ap); /* dummy read */
655 * ata_bmdma_freeze - Freeze BMDMA controller port
656 * @ap: port to freeze
658 * Freeze BMDMA controller port.
661 * Inherited from caller.
663 void ata_bmdma_freeze(struct ata_port *ap)
665 struct ata_ioports *ioaddr = &ap->ioaddr;
668 ap->last_ctl = ap->ctl;
670 if (ap->flags & ATA_FLAG_MMIO)
671 writeb(ap->ctl, (void __iomem *)ioaddr->ctl_addr);
673 outb(ap->ctl, ioaddr->ctl_addr);
677 * ata_bmdma_thaw - Thaw BMDMA controller port
680 * Thaw BMDMA controller port.
683 * Inherited from caller.
685 void ata_bmdma_thaw(struct ata_port *ap)
687 /* clear & re-enable interrupts */
689 ap->ops->irq_clear(ap);
690 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
695 * ata_bmdma_drive_eh - Perform EH with given methods for BMDMA controller
696 * @ap: port to handle error for
697 * @prereset: prereset method (can be NULL)
698 * @softreset: softreset method (can be NULL)
699 * @hardreset: hardreset method (can be NULL)
700 * @postreset: postreset method (can be NULL)
702 * Handle error for ATA BMDMA controller. It can handle both
703 * PATA and SATA controllers. Many controllers should be able to
704 * use this EH as-is or with some added handling before and
707 * This function is intended to be used for constructing
708 * ->error_handler callback by low level drivers.
711 * Kernel thread context (may sleep)
713 void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
714 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
715 ata_postreset_fn_t postreset)
717 struct ata_eh_context *ehc = &ap->eh_context;
718 struct ata_queued_cmd *qc;
722 qc = __ata_qc_from_tag(ap, ap->active_tag);
723 if (qc && !(qc->flags & ATA_QCFLAG_FAILED))
726 /* reset PIO HSM and stop DMA engine */
727 spin_lock_irqsave(ap->lock, flags);
729 ap->hsm_task_state = HSM_ST_IDLE;
731 if (qc && (qc->tf.protocol == ATA_PROT_DMA ||
732 qc->tf.protocol == ATA_PROT_ATAPI_DMA)) {
735 host_stat = ata_bmdma_status(ap);
737 ata_ehi_push_desc(&ehc->i, "BMDMA stat 0x%x", host_stat);
739 /* BMDMA controllers indicate host bus error by
740 * setting DMA_ERR bit and timing out. As it wasn't
741 * really a timeout event, adjust error mask and
742 * cancel frozen state.
744 if (qc->err_mask == AC_ERR_TIMEOUT && host_stat & ATA_DMA_ERR) {
745 qc->err_mask = AC_ERR_HOST_BUS;
749 ap->ops->bmdma_stop(qc);
754 ap->ops->irq_clear(ap);
756 spin_unlock_irqrestore(ap->lock, flags);
759 ata_eh_thaw_port(ap);
761 /* PIO and DMA engines have been stopped, perform recovery */
762 ata_do_eh(ap, prereset, softreset, hardreset, postreset);
766 * ata_bmdma_error_handler - Stock error handler for BMDMA controller
767 * @ap: port to handle error for
769 * Stock error handler for BMDMA controller.
772 * Kernel thread context (may sleep)
774 void ata_bmdma_error_handler(struct ata_port *ap)
776 ata_reset_fn_t hardreset;
779 if (sata_scr_valid(ap))
780 hardreset = sata_std_hardreset;
782 ata_bmdma_drive_eh(ap, ata_std_prereset, ata_std_softreset, hardreset,
787 * ata_bmdma_post_internal_cmd - Stock post_internal_cmd for
789 * @qc: internal command to clean up
792 * Kernel thread context (may sleep)
794 void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc)
801 * ata_pci_init_native_mode - Initialize native-mode driver
802 * @pdev: pci device to be initialized
803 * @port: array[2] of pointers to port info structures.
804 * @ports: bitmap of ports present
806 * Utility function which allocates and initializes an
807 * ata_probe_ent structure for a standard dual-port
808 * PIO-based IDE controller. The returned ata_probe_ent
809 * structure can be passed to ata_device_add(). The returned
810 * ata_probe_ent structure should then be freed with kfree().
812 * The caller need only pass the address of the primary port, the
813 * secondary will be deduced automatically. If the device has non
814 * standard secondary port mappings this function can be called twice,
815 * once for each interface.
818 struct ata_probe_ent *
819 ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int ports)
821 struct ata_probe_ent *probe_ent =
822 ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
829 probe_ent->irq = pdev->irq;
830 probe_ent->irq_flags = IRQF_SHARED;
832 if (ports & ATA_PORT_PRIMARY) {
833 probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 0);
834 probe_ent->port[p].altstatus_addr =
835 probe_ent->port[p].ctl_addr =
836 pci_resource_start(pdev, 1) | ATA_PCI_CTL_OFS;
837 bmdma = pci_resource_start(pdev, 4);
839 if (inb(bmdma + 2) & 0x80)
840 probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
841 probe_ent->port[p].bmdma_addr = bmdma;
843 ata_std_ports(&probe_ent->port[p]);
847 if (ports & ATA_PORT_SECONDARY) {
848 probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 2);
849 probe_ent->port[p].altstatus_addr =
850 probe_ent->port[p].ctl_addr =
851 pci_resource_start(pdev, 3) | ATA_PCI_CTL_OFS;
852 bmdma = pci_resource_start(pdev, 4);
855 if(inb(bmdma + 2) & 0x80)
856 probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
857 probe_ent->port[p].bmdma_addr = bmdma;
859 ata_std_ports(&probe_ent->port[p]);
860 probe_ent->pinfo2 = port[1];
864 probe_ent->n_ports = p;
869 static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
870 struct ata_port_info **port, int port_mask)
872 struct ata_probe_ent *probe_ent;
873 unsigned long bmdma = pci_resource_start(pdev, 4);
875 probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
879 probe_ent->n_ports = 2;
881 if (port_mask & ATA_PORT_PRIMARY) {
882 probe_ent->irq = ATA_PRIMARY_IRQ;
883 probe_ent->port[0].cmd_addr = ATA_PRIMARY_CMD;
884 probe_ent->port[0].altstatus_addr =
885 probe_ent->port[0].ctl_addr = ATA_PRIMARY_CTL;
887 probe_ent->port[0].bmdma_addr = bmdma;
888 if (inb(bmdma + 2) & 0x80)
889 probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
891 ata_std_ports(&probe_ent->port[0]);
893 probe_ent->dummy_port_mask |= ATA_PORT_PRIMARY;
895 if (port_mask & ATA_PORT_SECONDARY) {
897 probe_ent->irq2 = ATA_SECONDARY_IRQ;
899 probe_ent->irq = ATA_SECONDARY_IRQ;
900 probe_ent->port[1].cmd_addr = ATA_SECONDARY_CMD;
901 probe_ent->port[1].altstatus_addr =
902 probe_ent->port[1].ctl_addr = ATA_SECONDARY_CTL;
904 probe_ent->port[1].bmdma_addr = bmdma + 8;
905 if (inb(bmdma + 10) & 0x80)
906 probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
908 ata_std_ports(&probe_ent->port[1]);
910 /* FIXME: could be pointing to stack area; must copy */
911 probe_ent->pinfo2 = port[1];
913 probe_ent->dummy_port_mask |= ATA_PORT_SECONDARY;
920 * ata_pci_init_one - Initialize/register PCI IDE host controller
921 * @pdev: Controller to be initialized
922 * @port_info: Information from low-level host driver
923 * @n_ports: Number of ports attached to host controller
925 * This is a helper function which can be called from a driver's
926 * xxx_init_one() probe function if the hardware uses traditional
927 * IDE taskfile registers.
929 * This function calls pci_enable_device(), reserves its register
930 * regions, sets the dma mask, enables bus master mode, and calls
934 * Nobody makes a single channel controller that appears solely as
935 * the secondary legacy port on PCI.
938 * Inherited from PCI layer (may sleep).
941 * Zero on success, negative on errno-based value on error.
944 int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
945 unsigned int n_ports)
947 struct ata_probe_ent *probe_ent = NULL;
948 struct ata_port_info *port[2];
950 unsigned int legacy_mode = 0;
951 int disable_dev_on_err = 1;
956 BUG_ON(n_ports < 1 || n_ports > 2);
958 port[0] = port_info[0];
960 port[1] = port_info[1];
964 /* FIXME: Really for ATA it isn't safe because the device may be
965 multi-purpose and we want to leave it alone if it was already
966 enabled. Secondly for shared use as Arjan says we want refcounting
968 Checking dev->is_enabled is insufficient as this is not set at
969 boot for the primary video which is BIOS enabled
972 rc = pci_enable_device(pdev);
976 if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
979 /* TODO: What if one channel is in native mode ... */
980 pci_read_config_byte(pdev, PCI_CLASS_PROG, &tmp8);
981 mask = (1 << 2) | (1 << 0);
982 if ((tmp8 & mask) != mask)
983 legacy_mode = (1 << 3);
984 #if defined(CONFIG_NO_ATA_LEGACY)
985 /* Some platforms with PCI limits cannot address compat
986 port space. In that case we punt if their firmware has
987 left a device in compatibility mode */
989 printk(KERN_ERR "ata: Compatibility mode ATA is not supported on this platform, skipping.\n");
995 rc = pci_request_regions(pdev, DRV_NAME);
997 disable_dev_on_err = 0;
1002 if (!request_region(ATA_PRIMARY_CMD, 8, "libata")) {
1003 struct resource *conflict, res;
1004 res.start = ATA_PRIMARY_CMD;
1005 res.end = ATA_PRIMARY_CMD + 8 - 1;
1006 conflict = ____request_resource(&ioport_resource, &res);
1007 while (conflict->child)
1008 conflict = ____request_resource(conflict, &res);
1009 if (!strcmp(conflict->name, "libata"))
1010 legacy_mode |= ATA_PORT_PRIMARY;
1012 disable_dev_on_err = 0;
1013 printk(KERN_WARNING "ata: 0x%0X IDE port busy\n" \
1014 "ata: conflict with %s\n",
1019 legacy_mode |= ATA_PORT_PRIMARY;
1021 if (!request_region(ATA_SECONDARY_CMD, 8, "libata")) {
1022 struct resource *conflict, res;
1023 res.start = ATA_SECONDARY_CMD;
1024 res.end = ATA_SECONDARY_CMD + 8 - 1;
1025 conflict = ____request_resource(&ioport_resource, &res);
1026 while (conflict->child)
1027 conflict = ____request_resource(conflict, &res);
1028 if (!strcmp(conflict->name, "libata"))
1029 legacy_mode |= ATA_PORT_SECONDARY;
1031 disable_dev_on_err = 0;
1032 printk(KERN_WARNING "ata: 0x%X IDE port busy\n" \
1033 "ata: conflict with %s\n",
1038 legacy_mode |= ATA_PORT_SECONDARY;
1041 /* we have legacy mode, but all ports are unavailable */
1042 if (legacy_mode == (1 << 3)) {
1044 goto err_out_regions;
1047 /* TODO: If we get no DMA mask we should fall back to PIO */
1048 rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
1050 goto err_out_regions;
1051 rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
1053 goto err_out_regions;
1056 probe_ent = ata_pci_init_legacy_port(pdev, port, legacy_mode);
1059 probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
1061 probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY);
1065 goto err_out_regions;
1068 pci_set_master(pdev);
1070 if (!ata_device_add(probe_ent)) {
1082 if (legacy_mode & ATA_PORT_PRIMARY)
1083 release_region(ATA_PRIMARY_CMD, 8);
1084 if (legacy_mode & ATA_PORT_SECONDARY)
1085 release_region(ATA_SECONDARY_CMD, 8);
1086 pci_release_regions(pdev);
1088 if (disable_dev_on_err)
1089 pci_disable_device(pdev);
1094 * ata_pci_clear_simplex - attempt to kick device out of simplex
1097 * Some PCI ATA devices report simplex mode but in fact can be told to
1098 * enter non simplex mode. This implements the neccessary logic to
1099 * perform the task on such devices. Calling it on other devices will
1100 * have -undefined- behaviour.
1103 int ata_pci_clear_simplex(struct pci_dev *pdev)
1105 unsigned long bmdma = pci_resource_start(pdev, 4);
1111 simplex = inb(bmdma + 0x02);
1112 outb(simplex & 0x60, bmdma + 0x02);
1113 simplex = inb(bmdma + 0x02);
1119 unsigned long ata_pci_default_filter(const struct ata_port *ap, struct ata_device *adev, unsigned long xfer_mask)
1121 /* Filter out DMA modes if the device has been configured by
1122 the BIOS as PIO only */
1124 if (ap->ioaddr.bmdma_addr == 0)
1125 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
1129 #endif /* CONFIG_PCI */