]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/ide/setup-pci.c
2 * Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
3 * Copyright (C) 1995-1998 Mark Lord
4 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
6 * May be copied or modified under the terms of the GNU General Public License
9 #include <linux/types.h>
10 #include <linux/kernel.h>
11 #include <linux/pci.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/ide.h>
15 #include <linux/dma-mapping.h>
20 * ide_setup_pci_baseregs - place a PCI IDE controller native
21 * @dev: PCI device of interface to switch native
22 * @name: Name of interface
24 * We attempt to place the PCI interface into PCI native mode. If
25 * we succeed the BARs are ok and the controller is in PCI mode.
26 * Returns 0 on success or an errno code.
28 * FIXME: if we program the interface and then fail to set the BARS
29 * we don't switch it back to legacy mode. Do we actually care ??
32 static int ide_setup_pci_baseregs(struct pci_dev
*dev
, const char *name
)
37 * Place both IDE interfaces into PCI "native" mode:
39 if (pci_read_config_byte(dev
, PCI_CLASS_PROG
, &progif
) ||
41 if ((progif
& 0xa) != 0xa) {
42 printk(KERN_INFO
"%s %s: device not capable of full "
43 "native PCI mode\n", name
, pci_name(dev
));
46 printk(KERN_INFO
"%s %s: placing both ports into native PCI "
47 "mode\n", name
, pci_name(dev
));
48 (void) pci_write_config_byte(dev
, PCI_CLASS_PROG
, progif
|5);
49 if (pci_read_config_byte(dev
, PCI_CLASS_PROG
, &progif
) ||
51 printk(KERN_ERR
"%s %s: rewrite of PROGIF failed, "
52 "wanted 0x%04x, got 0x%04x\n",
53 name
, pci_name(dev
), progif
| 5, progif
);
60 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
61 static int ide_pci_clear_simplex(unsigned long dma_base
, const char *name
)
63 u8 dma_stat
= inb(dma_base
+ 2);
65 outb(dma_stat
& 0x60, dma_base
+ 2);
66 dma_stat
= inb(dma_base
+ 2);
68 return (dma_stat
& 0x80) ? 1 : 0;
72 * ide_pci_dma_base - setup BMIBA
73 * @hwif: IDE interface
76 * Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space.
79 unsigned long ide_pci_dma_base(ide_hwif_t
*hwif
, const struct ide_port_info
*d
)
81 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
82 unsigned long dma_base
= 0;
84 if (hwif
->host_flags
& IDE_HFLAG_MMIO
)
85 return hwif
->dma_base
;
87 if (hwif
->mate
&& hwif
->mate
->dma_base
) {
88 dma_base
= hwif
->mate
->dma_base
- (hwif
->channel
? 0 : 8);
90 u8 baridx
= (d
->host_flags
& IDE_HFLAG_CS5520
) ? 2 : 4;
92 dma_base
= pci_resource_start(dev
, baridx
);
95 printk(KERN_ERR
"%s %s: DMA base is invalid\n",
96 d
->name
, pci_name(dev
));
106 EXPORT_SYMBOL_GPL(ide_pci_dma_base
);
108 int ide_pci_check_simplex(ide_hwif_t
*hwif
, const struct ide_port_info
*d
)
110 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
113 if (d
->host_flags
& (IDE_HFLAG_MMIO
| IDE_HFLAG_CS5520
))
116 if (d
->host_flags
& IDE_HFLAG_CLEAR_SIMPLEX
) {
117 if (ide_pci_clear_simplex(hwif
->dma_base
, d
->name
))
118 printk(KERN_INFO
"%s %s: simplex device: DMA forced\n",
119 d
->name
, pci_name(dev
));
124 * If the device claims "simplex" DMA, this means that only one of
125 * the two interfaces can be trusted with DMA at any point in time
126 * (so we should enable DMA only on one of the two interfaces).
128 * FIXME: At this point we haven't probed the drives so we can't make
129 * the appropriate decision. Really we should defer this problem until
130 * we tune the drive then try to grab DMA ownership if we want to be
131 * the DMA end. This has to be become dynamic to handle hot-plug.
133 dma_stat
= hwif
->tp_ops
->read_sff_dma_status(hwif
);
134 if ((dma_stat
& 0x80) && hwif
->mate
&& hwif
->mate
->dma_base
) {
135 printk(KERN_INFO
"%s %s: simplex device: DMA disabled\n",
136 d
->name
, pci_name(dev
));
142 EXPORT_SYMBOL_GPL(ide_pci_check_simplex
);
145 * Set up BM-DMA capability (PnP BIOS should have done this)
147 int ide_pci_set_master(struct pci_dev
*dev
, const char *name
)
151 pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
);
153 if ((pcicmd
& PCI_COMMAND_MASTER
) == 0) {
156 if (pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
) ||
157 (pcicmd
& PCI_COMMAND_MASTER
) == 0) {
158 printk(KERN_ERR
"%s %s: error updating PCICMD\n",
159 name
, pci_name(dev
));
166 EXPORT_SYMBOL_GPL(ide_pci_set_master
);
167 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
169 void ide_setup_pci_noise(struct pci_dev
*dev
, const struct ide_port_info
*d
)
171 printk(KERN_INFO
"%s %s: IDE controller (0x%04x:0x%04x rev 0x%02x)\n",
172 d
->name
, pci_name(dev
),
173 dev
->vendor
, dev
->device
, dev
->revision
);
175 EXPORT_SYMBOL_GPL(ide_setup_pci_noise
);
179 * ide_pci_enable - do PCI enables
183 * Enable the IDE PCI device. We attempt to enable the device in full
184 * but if that fails then we only need IO space. The PCI code should
185 * have setup the proper resources for us already for controllers in
188 * Returns zero on success or an error code
191 static int ide_pci_enable(struct pci_dev
*dev
, const struct ide_port_info
*d
)
195 if (pci_enable_device(dev
)) {
196 ret
= pci_enable_device_io(dev
);
198 printk(KERN_WARNING
"%s %s: couldn't enable device\n",
199 d
->name
, pci_name(dev
));
202 printk(KERN_WARNING
"%s %s: BIOS configuration fixed\n",
203 d
->name
, pci_name(dev
));
207 * assume all devices can do 32-bit DMA for now, we can add
208 * a DMA mask field to the struct ide_port_info if we need it
209 * (or let lower level driver set the DMA mask)
211 ret
= pci_set_dma_mask(dev
, DMA_32BIT_MASK
);
213 printk(KERN_ERR
"%s %s: can't set DMA mask\n",
214 d
->name
, pci_name(dev
));
218 if (d
->host_flags
& IDE_HFLAG_SINGLE
)
223 if ((d
->host_flags
& IDE_HFLAG_NO_DMA
) == 0) {
224 if (d
->host_flags
& IDE_HFLAG_CS5520
)
230 ret
= pci_request_selected_regions(dev
, bars
, d
->name
);
232 printk(KERN_ERR
"%s %s: can't reserve resources\n",
233 d
->name
, pci_name(dev
));
239 * ide_pci_configure - configure an unconfigured device
243 * Enable and configure the PCI device we have been passed.
244 * Returns zero on success or an error code.
247 static int ide_pci_configure(struct pci_dev
*dev
, const struct ide_port_info
*d
)
251 * PnP BIOS was *supposed* to have setup this device, but we
252 * can do it ourselves, so long as the BIOS has assigned an IRQ
253 * (or possibly the device is using a "legacy header" for IRQs).
254 * Maybe the user deliberately *disabled* the device,
255 * but we'll eventually ignore it again if no drives respond.
257 if (ide_setup_pci_baseregs(dev
, d
->name
) ||
258 pci_write_config_word(dev
, PCI_COMMAND
, pcicmd
| PCI_COMMAND_IO
)) {
259 printk(KERN_INFO
"%s %s: device disabled (BIOS)\n",
260 d
->name
, pci_name(dev
));
263 if (pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
)) {
264 printk(KERN_ERR
"%s %s: error accessing PCI regs\n",
265 d
->name
, pci_name(dev
));
268 if (!(pcicmd
& PCI_COMMAND_IO
)) {
269 printk(KERN_ERR
"%s %s: unable to enable IDE controller\n",
270 d
->name
, pci_name(dev
));
277 * ide_pci_check_iomem - check a register is I/O
282 * Checks if a BAR is configured and points to MMIO space. If so,
283 * return an error code. Otherwise return 0
286 static int ide_pci_check_iomem(struct pci_dev
*dev
, const struct ide_port_info
*d
,
289 ulong flags
= pci_resource_flags(dev
, bar
);
292 if (!flags
|| pci_resource_len(dev
, bar
) == 0)
296 if (flags
& IORESOURCE_IO
)
304 * ide_hw_configure - configure a hw_regs_t instance
305 * @dev: PCI device holding interface
309 * @hw: hw_regs_t instance corresponding to this port
311 * Perform the initial set up for the hardware interface structure. This
312 * is done per interface port rather than per PCI device. There may be
313 * more than one port per device.
315 * Returns zero on success or an error code.
318 static int ide_hw_configure(struct pci_dev
*dev
, const struct ide_port_info
*d
,
319 unsigned int port
, int irq
, hw_regs_t
*hw
)
321 unsigned long ctl
= 0, base
= 0;
323 if ((d
->host_flags
& IDE_HFLAG_ISA_PORTS
) == 0) {
324 if (ide_pci_check_iomem(dev
, d
, 2 * port
) ||
325 ide_pci_check_iomem(dev
, d
, 2 * port
+ 1)) {
326 printk(KERN_ERR
"%s %s: I/O baseregs (BIOS) are "
327 "reported as MEM for port %d!\n",
328 d
->name
, pci_name(dev
), port
);
332 ctl
= pci_resource_start(dev
, 2*port
+1);
333 base
= pci_resource_start(dev
, 2*port
);
335 /* Use default values */
336 ctl
= port
? 0x374 : 0x3f4;
337 base
= port
? 0x170 : 0x1f0;
341 printk(KERN_ERR
"%s %s: bad PCI BARs for port %d, skipping\n",
342 d
->name
, pci_name(dev
), port
);
346 memset(hw
, 0, sizeof(*hw
));
349 hw
->chipset
= d
->chipset
? d
->chipset
: ide_pci
;
350 ide_std_init_ports(hw
, base
, ctl
| 2);
355 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
357 * ide_hwif_setup_dma - configure DMA interface
358 * @hwif: IDE interface
361 * Set up the DMA base for the interface. Enable the master bits as
362 * necessary and attempt to bring the device DMA into a ready to use
366 int ide_hwif_setup_dma(ide_hwif_t
*hwif
, const struct ide_port_info
*d
)
368 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
370 if ((d
->host_flags
& IDE_HFLAG_NO_AUTODMA
) == 0 ||
371 ((dev
->class >> 8) == PCI_CLASS_STORAGE_IDE
&&
372 (dev
->class & 0x80))) {
373 unsigned long base
= ide_pci_dma_base(hwif
, d
);
378 hwif
->dma_base
= base
;
380 if (ide_pci_check_simplex(hwif
, d
) < 0)
383 if (ide_pci_set_master(dev
, d
->name
) < 0)
386 if (hwif
->host_flags
& IDE_HFLAG_MMIO
)
387 printk(KERN_INFO
" %s: MMIO-DMA\n", hwif
->name
);
389 printk(KERN_INFO
" %s: BM-DMA at 0x%04lx-0x%04lx\n",
390 hwif
->name
, base
, base
+ 7);
392 hwif
->extra_base
= base
+ (hwif
->channel
? 8 : 16);
394 if (ide_allocate_dma_engine(hwif
))
397 hwif
->dma_ops
= &sff_dma_ops
;
402 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
405 * ide_setup_pci_controller - set up IDE PCI
408 * @noisy: verbose flag
410 * Set up the PCI and controller side of the IDE interface. This brings
411 * up the PCI side of the device, checks that the device is enabled
412 * and enables it if need be
415 static int ide_setup_pci_controller(struct pci_dev
*dev
,
416 const struct ide_port_info
*d
, int noisy
)
422 ide_setup_pci_noise(dev
, d
);
424 ret
= ide_pci_enable(dev
, d
);
428 ret
= pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
);
430 printk(KERN_ERR
"%s %s: error accessing PCI regs\n",
431 d
->name
, pci_name(dev
));
434 if (!(pcicmd
& PCI_COMMAND_IO
)) { /* is device disabled? */
435 ret
= ide_pci_configure(dev
, d
);
438 printk(KERN_INFO
"%s %s: device enabled (Linux)\n",
439 d
->name
, pci_name(dev
));
447 * ide_pci_setup_ports - configure ports/devices on PCI IDE
451 * @hw: hw_regs_t instances corresponding to this PCI IDE device
452 * @hws: hw_regs_t pointers table to update
454 * Scan the interfaces attached to this device and do any
455 * necessary per port setup. Attach the devices and ask the
456 * generic DMA layer to do its work for us.
458 * Normally called automaticall from do_ide_pci_setup_device,
459 * but is also used directly as a helper function by some controllers
460 * where the chipset setup is not the default PCI IDE one.
463 void ide_pci_setup_ports(struct pci_dev
*dev
, const struct ide_port_info
*d
,
464 int pciirq
, hw_regs_t
*hw
, hw_regs_t
**hws
)
466 int channels
= (d
->host_flags
& IDE_HFLAG_SINGLE
) ? 1 : 2, port
;
470 * Set up the IDE ports
473 for (port
= 0; port
< channels
; ++port
) {
474 const ide_pci_enablebit_t
*e
= &(d
->enablebits
[port
]);
476 if (e
->reg
&& (pci_read_config_byte(dev
, e
->reg
, &tmp
) ||
477 (tmp
& e
->mask
) != e
->val
)) {
478 printk(KERN_INFO
"%s %s: IDE port disabled\n",
479 d
->name
, pci_name(dev
));
480 continue; /* port not enabled */
483 if (ide_hw_configure(dev
, d
, port
, pciirq
, hw
+ port
))
486 *(hws
+ port
) = hw
+ port
;
489 EXPORT_SYMBOL_GPL(ide_pci_setup_ports
);
492 * ide_setup_pci_device() looks at the primary/secondary interfaces
493 * on a PCI IDE device and, if they are enabled, prepares the IDE driver
494 * for use with them. This generic code works for most PCI chipsets.
496 * One thing that is not standardized is the location of the
497 * primary/secondary interface "enable/disable" bits. For chipsets that
498 * we "know" about, this information is in the struct ide_port_info;
499 * for all other chipsets, we just assume both interfaces are enabled.
501 static int do_ide_setup_pci_device(struct pci_dev
*dev
,
502 const struct ide_port_info
*d
,
508 * Can we trust the reported IRQ?
513 * This allows offboard ide-pci cards the enable a BIOS,
514 * verify interrupt settings of split-mirror pci-config
515 * space, place chipset into init-mode, and/or preserve
516 * an interrupt if the card is not native ide support.
518 ret
= d
->init_chipset
? d
->init_chipset(dev
) : 0;
522 /* Is it an "IDE storage" device in non-PCI mode? */
523 if ((dev
->class >> 8) == PCI_CLASS_STORAGE_IDE
&& (dev
->class & 5) != 5) {
525 printk(KERN_INFO
"%s %s: not 100%% native mode: will "
526 "probe irqs later\n", d
->name
, pci_name(dev
));
528 } else if (!pciirq
&& noisy
) {
529 printk(KERN_WARNING
"%s %s: bad irq (%d): will probe later\n",
530 d
->name
, pci_name(dev
), pciirq
);
532 printk(KERN_INFO
"%s %s: 100%% native mode on irq %d\n",
533 d
->name
, pci_name(dev
), pciirq
);
541 int ide_pci_init_one(struct pci_dev
*dev
, const struct ide_port_info
*d
,
544 struct ide_host
*host
;
545 hw_regs_t hw
[4], *hws
[] = { NULL
, NULL
, NULL
, NULL
};
548 ret
= ide_setup_pci_controller(dev
, d
, 1);
552 ide_pci_setup_ports(dev
, d
, 0, &hw
[0], &hws
[0]);
554 host
= ide_host_alloc(d
, hws
);
560 host
->dev
[0] = &dev
->dev
;
562 host
->host_priv
= priv
;
564 pci_set_drvdata(dev
, host
);
566 ret
= do_ide_setup_pci_device(dev
, d
, 1);
571 hw
[1].irq
= hw
[0].irq
= ret
;
573 ret
= ide_host_register(host
, d
, hws
);
579 EXPORT_SYMBOL_GPL(ide_pci_init_one
);
581 int ide_pci_init_two(struct pci_dev
*dev1
, struct pci_dev
*dev2
,
582 const struct ide_port_info
*d
, void *priv
)
584 struct pci_dev
*pdev
[] = { dev1
, dev2
};
585 struct ide_host
*host
;
587 hw_regs_t hw
[4], *hws
[] = { NULL
, NULL
, NULL
, NULL
};
589 for (i
= 0; i
< 2; i
++) {
590 ret
= ide_setup_pci_controller(pdev
[i
], d
, !i
);
594 ide_pci_setup_ports(pdev
[i
], d
, 0, &hw
[i
*2], &hws
[i
*2]);
597 host
= ide_host_alloc(d
, hws
);
603 host
->dev
[0] = &dev1
->dev
;
604 host
->dev
[1] = &dev2
->dev
;
606 host
->host_priv
= priv
;
608 pci_set_drvdata(pdev
[0], host
);
609 pci_set_drvdata(pdev
[1], host
);
611 for (i
= 0; i
< 2; i
++) {
612 ret
= do_ide_setup_pci_device(pdev
[i
], d
, !i
);
615 * FIXME: Mom, mom, they stole me the helper function to undo
616 * do_ide_setup_pci_device() on the first device!
622 hw
[i
*2 + 1].irq
= hw
[i
*2].irq
= ret
;
625 ret
= ide_host_register(host
, d
, hws
);
631 EXPORT_SYMBOL_GPL(ide_pci_init_two
);
633 void ide_pci_remove(struct pci_dev
*dev
)
635 struct ide_host
*host
= pci_get_drvdata(dev
);
636 struct pci_dev
*dev2
= host
->dev
[1] ? to_pci_dev(host
->dev
[1]) : NULL
;
639 if (host
->host_flags
& IDE_HFLAG_SINGLE
)
644 if ((host
->host_flags
& IDE_HFLAG_NO_DMA
) == 0) {
645 if (host
->host_flags
& IDE_HFLAG_CS5520
)
651 ide_host_remove(host
);
654 pci_release_selected_regions(dev2
, bars
);
655 pci_release_selected_regions(dev
, bars
);
658 pci_disable_device(dev2
);
659 pci_disable_device(dev
);
661 EXPORT_SYMBOL_GPL(ide_pci_remove
);
664 int ide_pci_suspend(struct pci_dev
*dev
, pm_message_t state
)
667 pci_disable_device(dev
);
668 pci_set_power_state(dev
, pci_choose_state(dev
, state
));
672 EXPORT_SYMBOL_GPL(ide_pci_suspend
);
674 int ide_pci_resume(struct pci_dev
*dev
)
676 struct ide_host
*host
= pci_get_drvdata(dev
);
679 pci_set_power_state(dev
, PCI_D0
);
681 rc
= pci_enable_device(dev
);
685 pci_restore_state(dev
);
688 if (host
->init_chipset
)
689 host
->init_chipset(dev
);
693 EXPORT_SYMBOL_GPL(ide_pci_resume
);