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git.proxmox.com Git - mirror_ubuntu-hirsute-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/module.h>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/pci.h>
13 #include <linux/init.h>
14 #include <linux/timer.h>
16 #include <linux/interrupt.h>
17 #include <linux/ide.h>
18 #include <linux/dma-mapping.h>
24 * ide_setup_pci_baseregs - place a PCI IDE controller native
25 * @dev: PCI device of interface to switch native
26 * @name: Name of interface
28 * We attempt to place the PCI interface into PCI native mode. If
29 * we succeed the BARs are ok and the controller is in PCI mode.
30 * Returns 0 on success or an errno code.
32 * FIXME: if we program the interface and then fail to set the BARS
33 * we don't switch it back to legacy mode. Do we actually care ??
36 static int ide_setup_pci_baseregs(struct pci_dev
*dev
, const char *name
)
41 * Place both IDE interfaces into PCI "native" mode:
43 if (pci_read_config_byte(dev
, PCI_CLASS_PROG
, &progif
) ||
45 if ((progif
& 0xa) != 0xa) {
46 printk(KERN_INFO
"%s: device not capable of full "
47 "native PCI mode\n", name
);
50 printk("%s: placing both ports into native PCI mode\n", name
);
51 (void) pci_write_config_byte(dev
, PCI_CLASS_PROG
, progif
|5);
52 if (pci_read_config_byte(dev
, PCI_CLASS_PROG
, &progif
) ||
54 printk(KERN_ERR
"%s: rewrite of PROGIF failed, wanted "
55 "0x%04x, got 0x%04x\n",
56 name
, progif
|5, progif
);
63 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
64 static void ide_pci_clear_simplex(unsigned long dma_base
, const char *name
)
66 u8 dma_stat
= inb(dma_base
+ 2);
68 outb(dma_stat
& 0x60, dma_base
+ 2);
69 dma_stat
= inb(dma_base
+ 2);
71 printk(KERN_INFO
"%s: simplex device: DMA forced\n", name
);
75 * ide_get_or_set_dma_base - setup BMIBA
77 * @hwif: IDE interface
79 * Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space.
80 * Where a device has a partner that is already in DMA mode we check
81 * and enforce IDE simplex rules.
84 static unsigned long ide_get_or_set_dma_base(const struct ide_port_info
*d
, ide_hwif_t
*hwif
)
86 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
87 unsigned long dma_base
= 0;
91 return hwif
->dma_base
;
93 if (hwif
->mate
&& hwif
->mate
->dma_base
) {
94 dma_base
= hwif
->mate
->dma_base
- (hwif
->channel
? 0 : 8);
96 u8 baridx
= (d
->host_flags
& IDE_HFLAG_CS5520
) ? 2 : 4;
98 dma_base
= pci_resource_start(dev
, baridx
);
101 printk(KERN_ERR
"%s: DMA base is invalid\n", d
->name
);
109 if (d
->host_flags
& IDE_HFLAG_CS5520
)
112 if (d
->host_flags
& IDE_HFLAG_CLEAR_SIMPLEX
) {
113 ide_pci_clear_simplex(dma_base
, d
->name
);
118 * If the device claims "simplex" DMA, this means that only one of
119 * the two interfaces can be trusted with DMA at any point in time
120 * (so we should enable DMA only on one of the two interfaces).
122 * FIXME: At this point we haven't probed the drives so we can't make
123 * the appropriate decision. Really we should defer this problem until
124 * we tune the drive then try to grab DMA ownership if we want to be
125 * the DMA end. This has to be become dynamic to handle hot-plug.
127 dma_stat
= hwif
->INB(dma_base
+ 2);
128 if ((dma_stat
& 0x80) && hwif
->mate
&& hwif
->mate
->dma_base
) {
129 printk(KERN_INFO
"%s: simplex device: DMA disabled\n", d
->name
);
135 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
137 void ide_setup_pci_noise(struct pci_dev
*dev
, const struct ide_port_info
*d
)
139 printk(KERN_INFO
"%s: IDE controller (0x%04x:0x%04x rev 0x%02x) at "
140 " PCI slot %s\n", d
->name
, dev
->vendor
, dev
->device
,
141 dev
->revision
, pci_name(dev
));
143 EXPORT_SYMBOL_GPL(ide_setup_pci_noise
);
147 * ide_pci_enable - do PCI enables
151 * Enable the IDE PCI device. We attempt to enable the device in full
152 * but if that fails then we only need IO space. The PCI code should
153 * have setup the proper resources for us already for controllers in
156 * Returns zero on success or an error code
159 static int ide_pci_enable(struct pci_dev
*dev
, const struct ide_port_info
*d
)
163 if (pci_enable_device(dev
)) {
164 ret
= pci_enable_device_io(dev
);
166 printk(KERN_WARNING
"%s: (ide_setup_pci_device:) "
167 "Could not enable device.\n", d
->name
);
170 printk(KERN_WARNING
"%s: BIOS configuration fixed.\n", d
->name
);
174 * assume all devices can do 32-bit DMA for now, we can add
175 * a DMA mask field to the struct ide_port_info if we need it
176 * (or let lower level driver set the DMA mask)
178 ret
= pci_set_dma_mask(dev
, DMA_32BIT_MASK
);
180 printk(KERN_ERR
"%s: can't set dma mask\n", d
->name
);
184 /* FIXME: Temporary - until we put in the hotplug interface logic
185 Check that the bits we want are not in use by someone else. */
186 ret
= pci_request_region(dev
, 4, "ide_tmp");
190 pci_release_region(dev
, 4);
196 * ide_pci_configure - configure an unconfigured device
200 * Enable and configure the PCI device we have been passed.
201 * Returns zero on success or an error code.
204 static int ide_pci_configure(struct pci_dev
*dev
, const struct ide_port_info
*d
)
208 * PnP BIOS was *supposed* to have setup this device, but we
209 * can do it ourselves, so long as the BIOS has assigned an IRQ
210 * (or possibly the device is using a "legacy header" for IRQs).
211 * Maybe the user deliberately *disabled* the device,
212 * but we'll eventually ignore it again if no drives respond.
214 if (ide_setup_pci_baseregs(dev
, d
->name
) ||
215 pci_write_config_word(dev
, PCI_COMMAND
, pcicmd
| PCI_COMMAND_IO
)) {
216 printk(KERN_INFO
"%s: device disabled (BIOS)\n", d
->name
);
219 if (pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
)) {
220 printk(KERN_ERR
"%s: error accessing PCI regs\n", d
->name
);
223 if (!(pcicmd
& PCI_COMMAND_IO
)) {
224 printk(KERN_ERR
"%s: unable to enable IDE controller\n", d
->name
);
231 * ide_pci_check_iomem - check a register is I/O
236 * Checks if a BAR is configured and points to MMIO space. If so,
237 * return an error code. Otherwise return 0
240 static int ide_pci_check_iomem(struct pci_dev
*dev
, const struct ide_port_info
*d
,
243 ulong flags
= pci_resource_flags(dev
, bar
);
246 if (!flags
|| pci_resource_len(dev
, bar
) == 0)
250 if (flags
& IORESOURCE_IO
)
258 * ide_hwif_configure - configure an IDE interface
259 * @dev: PCI device holding interface
264 * Perform the initial set up for the hardware interface structure. This
265 * is done per interface port rather than per PCI device. There may be
266 * more than one port per device.
268 * Returns the new hardware interface structure, or NULL on a failure
271 static ide_hwif_t
*ide_hwif_configure(struct pci_dev
*dev
,
272 const struct ide_port_info
*d
,
273 unsigned int port
, int irq
)
275 unsigned long ctl
= 0, base
= 0;
279 if ((d
->host_flags
& IDE_HFLAG_ISA_PORTS
) == 0) {
280 if (ide_pci_check_iomem(dev
, d
, 2 * port
) ||
281 ide_pci_check_iomem(dev
, d
, 2 * port
+ 1)) {
282 printk(KERN_ERR
"%s: I/O baseregs (BIOS) are reported "
283 "as MEM for port %d!\n", d
->name
, port
);
287 ctl
= pci_resource_start(dev
, 2*port
+1);
288 base
= pci_resource_start(dev
, 2*port
);
289 if ((ctl
&& !base
) || (base
&& !ctl
)) {
290 printk(KERN_ERR
"%s: inconsistent baseregs (BIOS) "
291 "for port %d, skipping\n", d
->name
, port
);
296 /* Use default values */
297 ctl
= port
? 0x374 : 0x3f4;
298 base
= port
? 0x170 : 0x1f0;
301 hwif
= ide_find_port_slot(d
);
303 printk(KERN_ERR
"%s: too many IDE interfaces, no room in "
308 memset(&hw
, 0, sizeof(hw
));
311 hw
.chipset
= d
->chipset
? d
->chipset
: ide_pci
;
312 ide_std_init_ports(&hw
, base
, ctl
| 2);
314 ide_init_port_hw(hwif
, &hw
);
316 hwif
->dev
= &dev
->dev
;
322 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
324 * ide_hwif_setup_dma - configure DMA interface
325 * @hwif: IDE interface
328 * Set up the DMA base for the interface. Enable the master bits as
329 * necessary and attempt to bring the device DMA into a ready to use
333 void ide_hwif_setup_dma(ide_hwif_t
*hwif
, const struct ide_port_info
*d
)
335 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
338 pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
);
340 if ((d
->host_flags
& IDE_HFLAG_NO_AUTODMA
) == 0 ||
341 ((dev
->class >> 8) == PCI_CLASS_STORAGE_IDE
&&
342 (dev
->class & 0x80))) {
343 unsigned long dma_base
= ide_get_or_set_dma_base(d
, hwif
);
344 if (dma_base
&& !(pcicmd
& PCI_COMMAND_MASTER
)) {
346 * Set up BM-DMA capability
347 * (PnP BIOS should have done this)
350 if (pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
) || !(pcicmd
& PCI_COMMAND_MASTER
)) {
351 printk(KERN_ERR
"%s: %s error updating PCICMD\n",
352 hwif
->name
, d
->name
);
358 d
->init_dma(hwif
, dma_base
);
360 ide_setup_dma(hwif
, dma_base
);
363 printk(KERN_INFO
"%s: %s Bus-Master DMA disabled "
364 "(BIOS)\n", hwif
->name
, d
->name
);
368 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
371 * ide_setup_pci_controller - set up IDE PCI
374 * @noisy: verbose flag
375 * @config: returned as 1 if we configured the hardware
377 * Set up the PCI and controller side of the IDE interface. This brings
378 * up the PCI side of the device, checks that the device is enabled
379 * and enables it if need be
382 static int ide_setup_pci_controller(struct pci_dev
*dev
, const struct ide_port_info
*d
, int noisy
, int *config
)
388 ide_setup_pci_noise(dev
, d
);
390 ret
= ide_pci_enable(dev
, d
);
394 ret
= pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
);
396 printk(KERN_ERR
"%s: error accessing PCI regs\n", d
->name
);
399 if (!(pcicmd
& PCI_COMMAND_IO
)) { /* is device disabled? */
400 ret
= ide_pci_configure(dev
, d
);
404 printk(KERN_INFO
"%s: device enabled (Linux)\n", d
->name
);
412 * ide_pci_setup_ports - configure ports/devices on PCI IDE
416 * @idx: ATA index table to update
418 * Scan the interfaces attached to this device and do any
419 * necessary per port setup. Attach the devices and ask the
420 * generic DMA layer to do its work for us.
422 * Normally called automaticall from do_ide_pci_setup_device,
423 * but is also used directly as a helper function by some controllers
424 * where the chipset setup is not the default PCI IDE one.
427 void ide_pci_setup_ports(struct pci_dev
*dev
, const struct ide_port_info
*d
, int pciirq
, u8
*idx
)
429 int channels
= (d
->host_flags
& IDE_HFLAG_SINGLE
) ? 1 : 2, port
;
434 * Set up the IDE ports
437 for (port
= 0; port
< channels
; ++port
) {
438 const ide_pci_enablebit_t
*e
= &(d
->enablebits
[port
]);
440 if (e
->reg
&& (pci_read_config_byte(dev
, e
->reg
, &tmp
) ||
441 (tmp
& e
->mask
) != e
->val
)) {
442 printk(KERN_INFO
"%s: IDE port disabled\n", d
->name
);
443 continue; /* port not enabled */
446 hwif
= ide_hwif_configure(dev
, d
, port
, pciirq
);
450 *(idx
+ port
) = hwif
->index
;
453 EXPORT_SYMBOL_GPL(ide_pci_setup_ports
);
456 * ide_setup_pci_device() looks at the primary/secondary interfaces
457 * on a PCI IDE device and, if they are enabled, prepares the IDE driver
458 * for use with them. This generic code works for most PCI chipsets.
460 * One thing that is not standardized is the location of the
461 * primary/secondary interface "enable/disable" bits. For chipsets that
462 * we "know" about, this information is in the struct ide_port_info;
463 * for all other chipsets, we just assume both interfaces are enabled.
465 static int do_ide_setup_pci_device(struct pci_dev
*dev
,
466 const struct ide_port_info
*d
,
469 int tried_config
= 0;
472 ret
= ide_setup_pci_controller(dev
, d
, noisy
, &tried_config
);
477 * Can we trust the reported IRQ?
481 /* Is it an "IDE storage" device in non-PCI mode? */
482 if ((dev
->class >> 8) == PCI_CLASS_STORAGE_IDE
&& (dev
->class & 5) != 5) {
484 printk(KERN_INFO
"%s: not 100%% native mode: "
485 "will probe irqs later\n", d
->name
);
487 * This allows offboard ide-pci cards the enable a BIOS,
488 * verify interrupt settings of split-mirror pci-config
489 * space, place chipset into init-mode, and/or preserve
490 * an interrupt if the card is not native ide support.
492 ret
= d
->init_chipset
? d
->init_chipset(dev
, d
->name
) : 0;
496 } else if (tried_config
) {
498 printk(KERN_INFO
"%s: will probe irqs later\n", d
->name
);
500 } else if (!pciirq
) {
502 printk(KERN_WARNING
"%s: bad irq (%d): will probe later\n",
506 if (d
->init_chipset
) {
507 ret
= d
->init_chipset(dev
, d
->name
);
512 printk(KERN_INFO
"%s: 100%% native mode on irq %d\n",
516 /* FIXME: silent failure can happen */
518 ide_pci_setup_ports(dev
, d
, pciirq
, idx
);
523 int ide_setup_pci_device(struct pci_dev
*dev
, const struct ide_port_info
*d
)
525 u8 idx
[4] = { 0xff, 0xff, 0xff, 0xff };
528 ret
= do_ide_setup_pci_device(dev
, d
, &idx
[0], 1);
531 ide_device_add(idx
, d
);
535 EXPORT_SYMBOL_GPL(ide_setup_pci_device
);
537 int ide_setup_pci_devices(struct pci_dev
*dev1
, struct pci_dev
*dev2
,
538 const struct ide_port_info
*d
)
540 struct pci_dev
*pdev
[] = { dev1
, dev2
};
542 u8 idx
[4] = { 0xff, 0xff, 0xff, 0xff };
544 for (i
= 0; i
< 2; i
++) {
545 ret
= do_ide_setup_pci_device(pdev
[i
], d
, &idx
[i
*2], !i
);
547 * FIXME: Mom, mom, they stole me the helper function to undo
548 * do_ide_setup_pci_device() on the first device!
554 ide_device_add(idx
, d
);
558 EXPORT_SYMBOL_GPL(ide_setup_pci_devices
);