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/config.h>
36 #include <linux/kernel.h>
37 #include <linux/pci.h>
38 #include <linux/libata.h>
43 * ata_tf_load_pio - send taskfile registers to host controller
44 * @ap: Port to which output is sent
45 * @tf: ATA taskfile register set
47 * Outputs ATA taskfile to standard ATA host controller.
50 * Inherited from caller.
53 static void ata_tf_load_pio(struct ata_port *ap, const struct ata_taskfile *tf)
55 struct ata_ioports *ioaddr = &ap->ioaddr;
56 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
58 if (tf->ctl != ap->last_ctl) {
59 outb(tf->ctl, ioaddr->ctl_addr);
60 ap->last_ctl = tf->ctl;
64 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
65 outb(tf->hob_feature, ioaddr->feature_addr);
66 outb(tf->hob_nsect, ioaddr->nsect_addr);
67 outb(tf->hob_lbal, ioaddr->lbal_addr);
68 outb(tf->hob_lbam, ioaddr->lbam_addr);
69 outb(tf->hob_lbah, ioaddr->lbah_addr);
70 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
79 outb(tf->feature, ioaddr->feature_addr);
80 outb(tf->nsect, ioaddr->nsect_addr);
81 outb(tf->lbal, ioaddr->lbal_addr);
82 outb(tf->lbam, ioaddr->lbam_addr);
83 outb(tf->lbah, ioaddr->lbah_addr);
84 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
92 if (tf->flags & ATA_TFLAG_DEVICE) {
93 outb(tf->device, ioaddr->device_addr);
94 VPRINTK("device 0x%X\n", tf->device);
101 * ata_tf_load_mmio - send taskfile registers to host controller
102 * @ap: Port to which output is sent
103 * @tf: ATA taskfile register set
105 * Outputs ATA taskfile to standard ATA host controller using MMIO.
108 * Inherited from caller.
111 static void ata_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
113 struct ata_ioports *ioaddr = &ap->ioaddr;
114 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
116 if (tf->ctl != ap->last_ctl) {
117 writeb(tf->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
118 ap->last_ctl = tf->ctl;
122 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
123 writeb(tf->hob_feature, (void __iomem *) ioaddr->feature_addr);
124 writeb(tf->hob_nsect, (void __iomem *) ioaddr->nsect_addr);
125 writeb(tf->hob_lbal, (void __iomem *) ioaddr->lbal_addr);
126 writeb(tf->hob_lbam, (void __iomem *) ioaddr->lbam_addr);
127 writeb(tf->hob_lbah, (void __iomem *) ioaddr->lbah_addr);
128 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
137 writeb(tf->feature, (void __iomem *) ioaddr->feature_addr);
138 writeb(tf->nsect, (void __iomem *) ioaddr->nsect_addr);
139 writeb(tf->lbal, (void __iomem *) ioaddr->lbal_addr);
140 writeb(tf->lbam, (void __iomem *) ioaddr->lbam_addr);
141 writeb(tf->lbah, (void __iomem *) ioaddr->lbah_addr);
142 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
150 if (tf->flags & ATA_TFLAG_DEVICE) {
151 writeb(tf->device, (void __iomem *) ioaddr->device_addr);
152 VPRINTK("device 0x%X\n", tf->device);
160 * ata_tf_load - send taskfile registers to host controller
161 * @ap: Port to which output is sent
162 * @tf: ATA taskfile register set
164 * Outputs ATA taskfile to standard ATA host controller using MMIO
165 * or PIO as indicated by the ATA_FLAG_MMIO flag.
166 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
167 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
168 * hob_lbal, hob_lbam, and hob_lbah.
170 * This function waits for idle (!BUSY and !DRQ) after writing
171 * registers. If the control register has a new value, this
172 * function also waits for idle after writing control and before
173 * writing the remaining registers.
175 * May be used as the tf_load() entry in ata_port_operations.
178 * Inherited from caller.
180 void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
182 if (ap->flags & ATA_FLAG_MMIO)
183 ata_tf_load_mmio(ap, tf);
185 ata_tf_load_pio(ap, tf);
189 * ata_exec_command_pio - issue ATA command to host controller
190 * @ap: port to which command is being issued
191 * @tf: ATA taskfile register set
193 * Issues PIO write to ATA command register, with proper
194 * synchronization with interrupt handler / other threads.
197 * spin_lock_irqsave(host_set lock)
200 static void ata_exec_command_pio(struct ata_port *ap, const struct ata_taskfile *tf)
202 DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
204 outb(tf->command, ap->ioaddr.command_addr);
210 * ata_exec_command_mmio - issue ATA command to host controller
211 * @ap: port to which command is being issued
212 * @tf: ATA taskfile register set
214 * Issues MMIO write to ATA command register, with proper
215 * synchronization with interrupt handler / other threads.
217 * FIXME: missing write posting for 400nS delay enforcement
220 * spin_lock_irqsave(host_set lock)
223 static void ata_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
225 DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
227 writeb(tf->command, (void __iomem *) ap->ioaddr.command_addr);
233 * ata_exec_command - issue ATA command to host controller
234 * @ap: port to which command is being issued
235 * @tf: ATA taskfile register set
237 * Issues PIO/MMIO write to ATA command register, with proper
238 * synchronization with interrupt handler / other threads.
241 * spin_lock_irqsave(host_set lock)
243 void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf)
245 if (ap->flags & ATA_FLAG_MMIO)
246 ata_exec_command_mmio(ap, tf);
248 ata_exec_command_pio(ap, tf);
252 * ata_tf_read_pio - input device's ATA taskfile shadow registers
253 * @ap: Port from which input is read
254 * @tf: ATA taskfile register set for storing input
256 * Reads ATA taskfile registers for currently-selected device
260 * Inherited from caller.
263 static void ata_tf_read_pio(struct ata_port *ap, struct ata_taskfile *tf)
265 struct ata_ioports *ioaddr = &ap->ioaddr;
267 tf->command = ata_check_status(ap);
268 tf->feature = inb(ioaddr->error_addr);
269 tf->nsect = inb(ioaddr->nsect_addr);
270 tf->lbal = inb(ioaddr->lbal_addr);
271 tf->lbam = inb(ioaddr->lbam_addr);
272 tf->lbah = inb(ioaddr->lbah_addr);
273 tf->device = inb(ioaddr->device_addr);
275 if (tf->flags & ATA_TFLAG_LBA48) {
276 outb(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
277 tf->hob_feature = inb(ioaddr->error_addr);
278 tf->hob_nsect = inb(ioaddr->nsect_addr);
279 tf->hob_lbal = inb(ioaddr->lbal_addr);
280 tf->hob_lbam = inb(ioaddr->lbam_addr);
281 tf->hob_lbah = inb(ioaddr->lbah_addr);
286 * ata_tf_read_mmio - input device's ATA taskfile shadow registers
287 * @ap: Port from which input is read
288 * @tf: ATA taskfile register set for storing input
290 * Reads ATA taskfile registers for currently-selected device
294 * Inherited from caller.
297 static void ata_tf_read_mmio(struct ata_port *ap, struct ata_taskfile *tf)
299 struct ata_ioports *ioaddr = &ap->ioaddr;
301 tf->command = ata_check_status(ap);
302 tf->feature = readb((void __iomem *)ioaddr->error_addr);
303 tf->nsect = readb((void __iomem *)ioaddr->nsect_addr);
304 tf->lbal = readb((void __iomem *)ioaddr->lbal_addr);
305 tf->lbam = readb((void __iomem *)ioaddr->lbam_addr);
306 tf->lbah = readb((void __iomem *)ioaddr->lbah_addr);
307 tf->device = readb((void __iomem *)ioaddr->device_addr);
309 if (tf->flags & ATA_TFLAG_LBA48) {
310 writeb(tf->ctl | ATA_HOB, (void __iomem *) ap->ioaddr.ctl_addr);
311 tf->hob_feature = readb((void __iomem *)ioaddr->error_addr);
312 tf->hob_nsect = readb((void __iomem *)ioaddr->nsect_addr);
313 tf->hob_lbal = readb((void __iomem *)ioaddr->lbal_addr);
314 tf->hob_lbam = readb((void __iomem *)ioaddr->lbam_addr);
315 tf->hob_lbah = readb((void __iomem *)ioaddr->lbah_addr);
321 * ata_tf_read - input device's ATA taskfile shadow registers
322 * @ap: Port from which input is read
323 * @tf: ATA taskfile register set for storing input
325 * Reads ATA taskfile registers for currently-selected device
328 * Reads nsect, lbal, lbam, lbah, and device. If ATA_TFLAG_LBA48
329 * is set, also reads the hob registers.
331 * May be used as the tf_read() entry in ata_port_operations.
334 * Inherited from caller.
336 void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
338 if (ap->flags & ATA_FLAG_MMIO)
339 ata_tf_read_mmio(ap, tf);
341 ata_tf_read_pio(ap, tf);
345 * ata_check_status_pio - Read device status reg & clear interrupt
346 * @ap: port where the device is
348 * Reads ATA taskfile status register for currently-selected device
349 * and return its value. This also clears pending interrupts
353 * Inherited from caller.
355 static u8 ata_check_status_pio(struct ata_port *ap)
357 return inb(ap->ioaddr.status_addr);
361 * ata_check_status_mmio - Read device status reg & clear interrupt
362 * @ap: port where the device is
364 * Reads ATA taskfile status register for currently-selected device
365 * via MMIO and return its value. This also clears pending interrupts
369 * Inherited from caller.
371 static u8 ata_check_status_mmio(struct ata_port *ap)
373 return readb((void __iomem *) ap->ioaddr.status_addr);
378 * ata_check_status - Read device status reg & clear interrupt
379 * @ap: port where the device is
381 * Reads ATA taskfile status register for currently-selected device
382 * and return its value. This also clears pending interrupts
385 * May be used as the check_status() entry in ata_port_operations.
388 * Inherited from caller.
390 u8 ata_check_status(struct ata_port *ap)
392 if (ap->flags & ATA_FLAG_MMIO)
393 return ata_check_status_mmio(ap);
394 return ata_check_status_pio(ap);
399 * ata_altstatus - Read device alternate status reg
400 * @ap: port where the device is
402 * Reads ATA taskfile alternate status register for
403 * currently-selected device and return its value.
405 * Note: may NOT be used as the check_altstatus() entry in
406 * ata_port_operations.
409 * Inherited from caller.
411 u8 ata_altstatus(struct ata_port *ap)
413 if (ap->ops->check_altstatus)
414 return ap->ops->check_altstatus(ap);
416 if (ap->flags & ATA_FLAG_MMIO)
417 return readb((void __iomem *)ap->ioaddr.altstatus_addr);
418 return inb(ap->ioaddr.altstatus_addr);
422 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
423 * @qc: Info associated with this ATA transaction.
426 * spin_lock_irqsave(host_set lock)
429 static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
431 struct ata_port *ap = qc->ap;
432 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
434 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
436 /* load PRD table addr. */
437 mb(); /* make sure PRD table writes are visible to controller */
438 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
440 /* specify data direction, triple-check start bit is clear */
441 dmactl = readb(mmio + ATA_DMA_CMD);
442 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
444 dmactl |= ATA_DMA_WR;
445 writeb(dmactl, mmio + ATA_DMA_CMD);
447 /* issue r/w command */
448 ap->ops->exec_command(ap, &qc->tf);
452 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
453 * @qc: Info associated with this ATA transaction.
456 * spin_lock_irqsave(host_set lock)
459 static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
461 struct ata_port *ap = qc->ap;
462 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
465 /* start host DMA transaction */
466 dmactl = readb(mmio + ATA_DMA_CMD);
467 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
469 /* Strictly, one may wish to issue a readb() here, to
470 * flush the mmio write. However, control also passes
471 * to the hardware at this point, and it will interrupt
472 * us when we are to resume control. So, in effect,
473 * we don't care when the mmio write flushes.
474 * Further, a read of the DMA status register _immediately_
475 * following the write may not be what certain flaky hardware
476 * is expected, so I think it is best to not add a readb()
477 * without first all the MMIO ATA cards/mobos.
478 * Or maybe I'm just being paranoid.
483 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
484 * @qc: Info associated with this ATA transaction.
487 * spin_lock_irqsave(host_set lock)
490 static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
492 struct ata_port *ap = qc->ap;
493 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
496 /* load PRD table addr. */
497 outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
499 /* specify data direction, triple-check start bit is clear */
500 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
501 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
503 dmactl |= ATA_DMA_WR;
504 outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
506 /* issue r/w command */
507 ap->ops->exec_command(ap, &qc->tf);
511 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
512 * @qc: Info associated with this ATA transaction.
515 * spin_lock_irqsave(host_set lock)
518 static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
520 struct ata_port *ap = qc->ap;
523 /* start host DMA transaction */
524 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
525 outb(dmactl | ATA_DMA_START,
526 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
531 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
532 * @qc: Info associated with this ATA transaction.
534 * Writes the ATA_DMA_START flag to the DMA command register.
536 * May be used as the bmdma_start() entry in ata_port_operations.
539 * spin_lock_irqsave(host_set lock)
541 void ata_bmdma_start(struct ata_queued_cmd *qc)
543 if (qc->ap->flags & ATA_FLAG_MMIO)
544 ata_bmdma_start_mmio(qc);
546 ata_bmdma_start_pio(qc);
551 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
552 * @qc: Info associated with this ATA transaction.
554 * Writes address of PRD table to device's PRD Table Address
555 * register, sets the DMA control register, and calls
556 * ops->exec_command() to start the transfer.
558 * May be used as the bmdma_setup() entry in ata_port_operations.
561 * spin_lock_irqsave(host_set lock)
563 void ata_bmdma_setup(struct ata_queued_cmd *qc)
565 if (qc->ap->flags & ATA_FLAG_MMIO)
566 ata_bmdma_setup_mmio(qc);
568 ata_bmdma_setup_pio(qc);
573 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
574 * @ap: Port associated with this ATA transaction.
576 * Clear interrupt and error flags in DMA status register.
578 * May be used as the irq_clear() entry in ata_port_operations.
581 * spin_lock_irqsave(host_set lock)
584 void ata_bmdma_irq_clear(struct ata_port *ap)
586 if (!ap->ioaddr.bmdma_addr)
589 if (ap->flags & ATA_FLAG_MMIO) {
591 ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
592 writeb(readb(mmio), mmio);
594 unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
595 outb(inb(addr), addr);
601 * ata_bmdma_status - Read PCI IDE BMDMA status
602 * @ap: Port associated with this ATA transaction.
604 * Read and return BMDMA status register.
606 * May be used as the bmdma_status() entry in ata_port_operations.
609 * spin_lock_irqsave(host_set lock)
612 u8 ata_bmdma_status(struct ata_port *ap)
615 if (ap->flags & ATA_FLAG_MMIO) {
616 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
617 host_stat = readb(mmio + ATA_DMA_STATUS);
619 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
625 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
626 * @qc: Command we are ending DMA for
628 * Clears the ATA_DMA_START flag in the dma control register
630 * May be used as the bmdma_stop() entry in ata_port_operations.
633 * spin_lock_irqsave(host_set lock)
636 void ata_bmdma_stop(struct ata_queued_cmd *qc)
638 struct ata_port *ap = qc->ap;
639 if (ap->flags & ATA_FLAG_MMIO) {
640 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
642 /* clear start/stop bit */
643 writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
646 /* clear start/stop bit */
647 outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
648 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
651 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
652 ata_altstatus(ap); /* dummy read */
656 static struct ata_probe_ent *
657 ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
659 struct ata_probe_ent *probe_ent;
661 probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
663 printk(KERN_ERR DRV_NAME "(%s): out of memory\n",
664 kobject_name(&(dev->kobj)));
668 INIT_LIST_HEAD(&probe_ent->node);
669 probe_ent->dev = dev;
671 probe_ent->sht = port->sht;
672 probe_ent->host_flags = port->host_flags;
673 probe_ent->pio_mask = port->pio_mask;
674 probe_ent->mwdma_mask = port->mwdma_mask;
675 probe_ent->udma_mask = port->udma_mask;
676 probe_ent->port_ops = port->port_ops;
683 * ata_pci_init_native_mode - Initialize native-mode driver
684 * @pdev: pci device to be initialized
685 * @port: array[2] of pointers to port info structures.
686 * @ports: bitmap of ports present
688 * Utility function which allocates and initializes an
689 * ata_probe_ent structure for a standard dual-port
690 * PIO-based IDE controller. The returned ata_probe_ent
691 * structure can be passed to ata_device_add(). The returned
692 * ata_probe_ent structure should then be freed with kfree().
694 * The caller need only pass the address of the primary port, the
695 * secondary will be deduced automatically. If the device has non
696 * standard secondary port mappings this function can be called twice,
697 * once for each interface.
700 struct ata_probe_ent *
701 ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int ports)
703 struct ata_probe_ent *probe_ent =
704 ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
710 probe_ent->irq = pdev->irq;
711 probe_ent->irq_flags = SA_SHIRQ;
712 probe_ent->private_data = port[0]->private_data;
714 if (ports & ATA_PORT_PRIMARY) {
715 probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 0);
716 probe_ent->port[p].altstatus_addr =
717 probe_ent->port[p].ctl_addr =
718 pci_resource_start(pdev, 1) | ATA_PCI_CTL_OFS;
719 probe_ent->port[p].bmdma_addr = pci_resource_start(pdev, 4);
720 ata_std_ports(&probe_ent->port[p]);
724 if (ports & ATA_PORT_SECONDARY) {
725 probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 2);
726 probe_ent->port[p].altstatus_addr =
727 probe_ent->port[p].ctl_addr =
728 pci_resource_start(pdev, 3) | ATA_PCI_CTL_OFS;
729 probe_ent->port[p].bmdma_addr = pci_resource_start(pdev, 4) + 8;
730 ata_std_ports(&probe_ent->port[p]);
734 probe_ent->n_ports = p;
739 static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
740 struct ata_port_info *port, int port_num)
742 struct ata_probe_ent *probe_ent;
744 probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port);
748 probe_ent->legacy_mode = 1;
749 probe_ent->n_ports = 1;
750 probe_ent->hard_port_no = port_num;
751 probe_ent->private_data = port->private_data;
757 probe_ent->port[0].cmd_addr = 0x1f0;
758 probe_ent->port[0].altstatus_addr =
759 probe_ent->port[0].ctl_addr = 0x3f6;
763 probe_ent->port[0].cmd_addr = 0x170;
764 probe_ent->port[0].altstatus_addr =
765 probe_ent->port[0].ctl_addr = 0x376;
769 probe_ent->port[0].bmdma_addr =
770 pci_resource_start(pdev, 4) + 8 * port_num;
771 ata_std_ports(&probe_ent->port[0]);
778 * ata_pci_init_one - Initialize/register PCI IDE host controller
779 * @pdev: Controller to be initialized
780 * @port_info: Information from low-level host driver
781 * @n_ports: Number of ports attached to host controller
783 * This is a helper function which can be called from a driver's
784 * xxx_init_one() probe function if the hardware uses traditional
785 * IDE taskfile registers.
787 * This function calls pci_enable_device(), reserves its register
788 * regions, sets the dma mask, enables bus master mode, and calls
792 * Inherited from PCI layer (may sleep).
795 * Zero on success, negative on errno-based value on error.
798 int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
799 unsigned int n_ports)
801 struct ata_probe_ent *probe_ent = NULL, *probe_ent2 = NULL;
802 struct ata_port_info *port[2];
804 unsigned int legacy_mode = 0;
805 int disable_dev_on_err = 1;
810 port[0] = port_info[0];
812 port[1] = port_info[1];
816 if ((port[0]->host_flags & ATA_FLAG_NO_LEGACY) == 0
817 && (pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
818 /* TODO: What if one channel is in native mode ... */
819 pci_read_config_byte(pdev, PCI_CLASS_PROG, &tmp8);
820 mask = (1 << 2) | (1 << 0);
821 if ((tmp8 & mask) != mask)
822 legacy_mode = (1 << 3);
826 if ((!legacy_mode) && (n_ports > 2)) {
827 printk(KERN_ERR "ata: BUG: native mode, n_ports > 2\n");
832 /* FIXME: Really for ATA it isn't safe because the device may be
833 multi-purpose and we want to leave it alone if it was already
834 enabled. Secondly for shared use as Arjan says we want refcounting
836 Checking dev->is_enabled is insufficient as this is not set at
837 boot for the primary video which is BIOS enabled
840 rc = pci_enable_device(pdev);
844 rc = pci_request_regions(pdev, DRV_NAME);
846 disable_dev_on_err = 0;
850 /* FIXME: Should use platform specific mappers for legacy port ranges */
852 if (!request_region(0x1f0, 8, "libata")) {
853 struct resource *conflict, res;
855 res.end = 0x1f0 + 8 - 1;
856 conflict = ____request_resource(&ioport_resource, &res);
857 if (!strcmp(conflict->name, "libata"))
858 legacy_mode |= (1 << 0);
860 disable_dev_on_err = 0;
861 printk(KERN_WARNING "ata: 0x1f0 IDE port busy\n");
864 legacy_mode |= (1 << 0);
866 if (!request_region(0x170, 8, "libata")) {
867 struct resource *conflict, res;
869 res.end = 0x170 + 8 - 1;
870 conflict = ____request_resource(&ioport_resource, &res);
871 if (!strcmp(conflict->name, "libata"))
872 legacy_mode |= (1 << 1);
874 disable_dev_on_err = 0;
875 printk(KERN_WARNING "ata: 0x170 IDE port busy\n");
878 legacy_mode |= (1 << 1);
881 /* we have legacy mode, but all ports are unavailable */
882 if (legacy_mode == (1 << 3)) {
884 goto err_out_regions;
887 /* FIXME: If we get no DMA mask we should fall back to PIO */
888 rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
890 goto err_out_regions;
891 rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
893 goto err_out_regions;
896 if (legacy_mode & (1 << 0))
897 probe_ent = ata_pci_init_legacy_port(pdev, port[0], 0);
898 if (legacy_mode & (1 << 1))
899 probe_ent2 = ata_pci_init_legacy_port(pdev, port[1], 1);
902 probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
904 probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY);
906 if (!probe_ent && !probe_ent2) {
908 goto err_out_regions;
911 pci_set_master(pdev);
913 /* FIXME: check ata_device_add return */
915 if (legacy_mode & (1 << 0))
916 ata_device_add(probe_ent);
917 if (legacy_mode & (1 << 1))
918 ata_device_add(probe_ent2);
920 ata_device_add(probe_ent);
928 if (legacy_mode & (1 << 0))
929 release_region(0x1f0, 8);
930 if (legacy_mode & (1 << 1))
931 release_region(0x170, 8);
932 pci_release_regions(pdev);
934 if (disable_dev_on_err)
935 pci_disable_device(pdev);
940 * ata_pci_clear_simplex - attempt to kick device out of simplex
943 * Some PCI ATA devices report simplex mode but in fact can be told to
944 * enter non simplex mode. This implements the neccessary logic to
945 * perform the task on such devices. Calling it on other devices will
946 * have -undefined- behaviour.
949 int ata_pci_clear_simplex(struct pci_dev *pdev)
951 unsigned long bmdma = pci_resource_start(pdev, 4);
957 simplex = inb(bmdma + 0x02);
958 outb(simplex & 0x60, bmdma + 0x02);
959 simplex = inb(bmdma + 0x02);
965 unsigned long ata_pci_default_filter(const struct ata_port *ap, struct ata_device *adev, unsigned long xfer_mask)
967 /* Filter out DMA modes if the device has been configured by
968 the BIOS as PIO only */
970 if (ap->ioaddr.bmdma_addr == 0)
971 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
975 #endif /* CONFIG_PCI */