]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/scsi/libata-bmdma.c
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 static struct ata_probe_ent
*
423 ata_probe_ent_alloc(struct device
*dev
, const struct ata_port_info
*port
)
425 struct ata_probe_ent
*probe_ent
;
427 probe_ent
= kzalloc(sizeof(*probe_ent
), GFP_KERNEL
);
429 printk(KERN_ERR DRV_NAME
"(%s): out of memory\n",
430 kobject_name(&(dev
->kobj
)));
434 INIT_LIST_HEAD(&probe_ent
->node
);
435 probe_ent
->dev
= dev
;
437 probe_ent
->sht
= port
->sht
;
438 probe_ent
->host_flags
= port
->host_flags
;
439 probe_ent
->pio_mask
= port
->pio_mask
;
440 probe_ent
->mwdma_mask
= port
->mwdma_mask
;
441 probe_ent
->udma_mask
= port
->udma_mask
;
442 probe_ent
->port_ops
= port
->port_ops
;
449 * ata_pci_init_native_mode - Initialize native-mode driver
450 * @pdev: pci device to be initialized
451 * @port: array[2] of pointers to port info structures.
452 * @ports: bitmap of ports present
454 * Utility function which allocates and initializes an
455 * ata_probe_ent structure for a standard dual-port
456 * PIO-based IDE controller. The returned ata_probe_ent
457 * structure can be passed to ata_device_add(). The returned
458 * ata_probe_ent structure should then be freed with kfree().
460 * The caller need only pass the address of the primary port, the
461 * secondary will be deduced automatically. If the device has non
462 * standard secondary port mappings this function can be called twice,
463 * once for each interface.
466 struct ata_probe_ent
*
467 ata_pci_init_native_mode(struct pci_dev
*pdev
, struct ata_port_info
**port
, int ports
)
469 struct ata_probe_ent
*probe_ent
=
470 ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
[0]);
476 probe_ent
->irq
= pdev
->irq
;
477 probe_ent
->irq_flags
= SA_SHIRQ
;
478 probe_ent
->private_data
= port
[0]->private_data
;
480 if (ports
& ATA_PORT_PRIMARY
) {
481 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 0);
482 probe_ent
->port
[p
].altstatus_addr
=
483 probe_ent
->port
[p
].ctl_addr
=
484 pci_resource_start(pdev
, 1) | ATA_PCI_CTL_OFS
;
485 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4);
486 ata_std_ports(&probe_ent
->port
[p
]);
490 if (ports
& ATA_PORT_SECONDARY
) {
491 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 2);
492 probe_ent
->port
[p
].altstatus_addr
=
493 probe_ent
->port
[p
].ctl_addr
=
494 pci_resource_start(pdev
, 3) | ATA_PCI_CTL_OFS
;
495 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4) + 8;
496 ata_std_ports(&probe_ent
->port
[p
]);
500 probe_ent
->n_ports
= p
;
505 static struct ata_probe_ent
*ata_pci_init_legacy_port(struct pci_dev
*pdev
,
506 struct ata_port_info
*port
, int port_num
)
508 struct ata_probe_ent
*probe_ent
;
510 probe_ent
= ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
);
514 probe_ent
->legacy_mode
= 1;
515 probe_ent
->n_ports
= 1;
516 probe_ent
->hard_port_no
= port_num
;
517 probe_ent
->private_data
= port
->private_data
;
523 probe_ent
->port
[0].cmd_addr
= 0x1f0;
524 probe_ent
->port
[0].altstatus_addr
=
525 probe_ent
->port
[0].ctl_addr
= 0x3f6;
529 probe_ent
->port
[0].cmd_addr
= 0x170;
530 probe_ent
->port
[0].altstatus_addr
=
531 probe_ent
->port
[0].ctl_addr
= 0x376;
535 probe_ent
->port
[0].bmdma_addr
=
536 pci_resource_start(pdev
, 4) + 8 * port_num
;
537 ata_std_ports(&probe_ent
->port
[0]);
544 * ata_pci_init_one - Initialize/register PCI IDE host controller
545 * @pdev: Controller to be initialized
546 * @port_info: Information from low-level host driver
547 * @n_ports: Number of ports attached to host controller
549 * This is a helper function which can be called from a driver's
550 * xxx_init_one() probe function if the hardware uses traditional
551 * IDE taskfile registers.
553 * This function calls pci_enable_device(), reserves its register
554 * regions, sets the dma mask, enables bus master mode, and calls
558 * Inherited from PCI layer (may sleep).
561 * Zero on success, negative on errno-based value on error.
564 int ata_pci_init_one (struct pci_dev
*pdev
, struct ata_port_info
**port_info
,
565 unsigned int n_ports
)
567 struct ata_probe_ent
*probe_ent
= NULL
, *probe_ent2
= NULL
;
568 struct ata_port_info
*port
[2];
570 unsigned int legacy_mode
= 0;
571 int disable_dev_on_err
= 1;
576 port
[0] = port_info
[0];
578 port
[1] = port_info
[1];
582 if ((port
[0]->host_flags
& ATA_FLAG_NO_LEGACY
) == 0
583 && (pdev
->class >> 8) == PCI_CLASS_STORAGE_IDE
) {
584 /* TODO: What if one channel is in native mode ... */
585 pci_read_config_byte(pdev
, PCI_CLASS_PROG
, &tmp8
);
586 mask
= (1 << 2) | (1 << 0);
587 if ((tmp8
& mask
) != mask
)
588 legacy_mode
= (1 << 3);
592 if ((!legacy_mode
) && (n_ports
> 2)) {
593 printk(KERN_ERR
"ata: BUG: native mode, n_ports > 2\n");
598 /* FIXME: Really for ATA it isn't safe because the device may be
599 multi-purpose and we want to leave it alone if it was already
600 enabled. Secondly for shared use as Arjan says we want refcounting
602 Checking dev->is_enabled is insufficient as this is not set at
603 boot for the primary video which is BIOS enabled
606 rc
= pci_enable_device(pdev
);
610 rc
= pci_request_regions(pdev
, DRV_NAME
);
612 disable_dev_on_err
= 0;
616 /* FIXME: Should use platform specific mappers for legacy port ranges */
618 if (!request_region(0x1f0, 8, "libata")) {
619 struct resource
*conflict
, res
;
621 res
.end
= 0x1f0 + 8 - 1;
622 conflict
= ____request_resource(&ioport_resource
, &res
);
623 if (!strcmp(conflict
->name
, "libata"))
624 legacy_mode
|= (1 << 0);
626 disable_dev_on_err
= 0;
627 printk(KERN_WARNING
"ata: 0x1f0 IDE port busy\n");
630 legacy_mode
|= (1 << 0);
632 if (!request_region(0x170, 8, "libata")) {
633 struct resource
*conflict
, res
;
635 res
.end
= 0x170 + 8 - 1;
636 conflict
= ____request_resource(&ioport_resource
, &res
);
637 if (!strcmp(conflict
->name
, "libata"))
638 legacy_mode
|= (1 << 1);
640 disable_dev_on_err
= 0;
641 printk(KERN_WARNING
"ata: 0x170 IDE port busy\n");
644 legacy_mode
|= (1 << 1);
647 /* we have legacy mode, but all ports are unavailable */
648 if (legacy_mode
== (1 << 3)) {
650 goto err_out_regions
;
653 /* FIXME: If we get no DMA mask we should fall back to PIO */
654 rc
= pci_set_dma_mask(pdev
, ATA_DMA_MASK
);
656 goto err_out_regions
;
657 rc
= pci_set_consistent_dma_mask(pdev
, ATA_DMA_MASK
);
659 goto err_out_regions
;
662 if (legacy_mode
& (1 << 0))
663 probe_ent
= ata_pci_init_legacy_port(pdev
, port
[0], 0);
664 if (legacy_mode
& (1 << 1))
665 probe_ent2
= ata_pci_init_legacy_port(pdev
, port
[1], 1);
668 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
| ATA_PORT_SECONDARY
);
670 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
);
672 if (!probe_ent
&& !probe_ent2
) {
674 goto err_out_regions
;
677 pci_set_master(pdev
);
679 /* FIXME: check ata_device_add return */
681 if (legacy_mode
& (1 << 0))
682 ata_device_add(probe_ent
);
683 if (legacy_mode
& (1 << 1))
684 ata_device_add(probe_ent2
);
686 ata_device_add(probe_ent
);
694 if (legacy_mode
& (1 << 0))
695 release_region(0x1f0, 8);
696 if (legacy_mode
& (1 << 1))
697 release_region(0x170, 8);
698 pci_release_regions(pdev
);
700 if (disable_dev_on_err
)
701 pci_disable_device(pdev
);
706 * ata_pci_clear_simplex - attempt to kick device out of simplex
709 * Some PCI ATA devices report simplex mode but in fact can be told to
710 * enter non simplex mode. This implements the neccessary logic to
711 * perform the task on such devices. Calling it on other devices will
712 * have -undefined- behaviour.
715 int ata_pci_clear_simplex(struct pci_dev
*pdev
)
717 unsigned long bmdma
= pci_resource_start(pdev
, 4);
723 simplex
= inb(bmdma
+ 0x02);
724 outb(simplex
& 0x60, bmdma
+ 0x02);
725 simplex
= inb(bmdma
+ 0x02);
731 unsigned long ata_pci_default_filter(const struct ata_port
*ap
, struct ata_device
*adev
, unsigned long xfer_mask
)
733 /* Filter out DMA modes if the device has been configured by
734 the BIOS as PIO only */
736 if (ap
->ioaddr
.bmdma_addr
== 0)
737 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
741 #endif /* CONFIG_PCI */