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>
25 * ide_match_hwif - match a PCI IDE against an ide_hwif
26 * @io_base: I/O base of device
27 * @bootable: set if its bootable
28 * @name: name of device
30 * Match a PCI IDE port against an entry in ide_hwifs[],
31 * based on io_base port if possible. Return the matching hwif,
32 * or a new hwif. If we find an error (clashing, out of devices, etc)
35 * FIXME: we need to handle mmio matches here too
38 static ide_hwif_t
*ide_match_hwif(unsigned long io_base
, u8 bootable
, const char *name
)
44 * Look for a hwif with matching io_base default value.
45 * If chipset is "ide_unknown", then claim that hwif slot.
46 * Otherwise, some other chipset has already claimed it.. :(
48 for (h
= 0; h
< MAX_HWIFS
; ++h
) {
50 if (hwif
->io_ports
[IDE_DATA_OFFSET
] == io_base
) {
51 if (hwif
->chipset
== ide_unknown
)
52 return hwif
; /* match */
53 printk(KERN_ERR
"%s: port 0x%04lx already claimed by %s\n",
54 name
, io_base
, hwif
->name
);
55 return NULL
; /* already claimed */
59 * Okay, there is no hwif matching our io_base,
60 * so we'll just claim an unassigned slot.
61 * Give preference to claiming other slots before claiming ide0/ide1,
62 * just in case there's another interface yet-to-be-scanned
63 * which uses ports 1f0/170 (the ide0/ide1 defaults).
65 * Unless there is a bootable card that does not use the standard
66 * ports 1f0/170 (the ide0/ide1 defaults). The (bootable) flag.
69 for (h
= 0; h
< MAX_HWIFS
; ++h
) {
71 if (hwif
->chipset
== ide_unknown
)
72 return hwif
; /* pick an unused entry */
75 for (h
= 2; h
< MAX_HWIFS
; ++h
) {
77 if (hwif
->chipset
== ide_unknown
)
78 return hwif
; /* pick an unused entry */
81 for (h
= 0; h
< 2 && h
< MAX_HWIFS
; ++h
) {
83 if (hwif
->chipset
== ide_unknown
)
84 return hwif
; /* pick an unused entry */
86 printk(KERN_ERR
"%s: too many IDE interfaces, no room in table\n", name
);
91 * ide_setup_pci_baseregs - place a PCI IDE controller native
92 * @dev: PCI device of interface to switch native
93 * @name: Name of interface
95 * We attempt to place the PCI interface into PCI native mode. If
96 * we succeed the BARs are ok and the controller is in PCI mode.
97 * Returns 0 on success or an errno code.
99 * FIXME: if we program the interface and then fail to set the BARS
100 * we don't switch it back to legacy mode. Do we actually care ??
103 static int ide_setup_pci_baseregs (struct pci_dev
*dev
, const char *name
)
108 * Place both IDE interfaces into PCI "native" mode:
110 if (pci_read_config_byte(dev
, PCI_CLASS_PROG
, &progif
) ||
112 if ((progif
& 0xa) != 0xa) {
113 printk(KERN_INFO
"%s: device not capable of full "
114 "native PCI mode\n", name
);
117 printk("%s: placing both ports into native PCI mode\n", name
);
118 (void) pci_write_config_byte(dev
, PCI_CLASS_PROG
, progif
|5);
119 if (pci_read_config_byte(dev
, PCI_CLASS_PROG
, &progif
) ||
121 printk(KERN_ERR
"%s: rewrite of PROGIF failed, wanted "
122 "0x%04x, got 0x%04x\n",
123 name
, progif
|5, progif
);
130 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
131 static void ide_pci_clear_simplex(unsigned long dma_base
, const char *name
)
133 u8 dma_stat
= inb(dma_base
+ 2);
135 outb(dma_stat
& 0x60, dma_base
+ 2);
136 dma_stat
= inb(dma_base
+ 2);
138 printk(KERN_INFO
"%s: simplex device: DMA forced\n", name
);
142 * ide_get_or_set_dma_base - setup BMIBA
144 * @hwif: IDE interface
146 * Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space.
147 * Where a device has a partner that is already in DMA mode we check
148 * and enforce IDE simplex rules.
151 static unsigned long ide_get_or_set_dma_base(const struct ide_port_info
*d
, ide_hwif_t
*hwif
)
153 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
154 unsigned long dma_base
= 0;
158 return hwif
->dma_base
;
160 if (hwif
->mate
&& hwif
->mate
->dma_base
) {
161 dma_base
= hwif
->mate
->dma_base
- (hwif
->channel
? 0 : 8);
163 u8 baridx
= (d
->host_flags
& IDE_HFLAG_CS5520
) ? 2 : 4;
165 dma_base
= pci_resource_start(dev
, baridx
);
168 printk(KERN_ERR
"%s: DMA base is invalid\n", d
->name
);
176 if (d
->host_flags
& IDE_HFLAG_CS5520
)
179 if (d
->host_flags
& IDE_HFLAG_CLEAR_SIMPLEX
) {
180 ide_pci_clear_simplex(dma_base
, d
->name
);
185 * If the device claims "simplex" DMA, this means that only one of
186 * the two interfaces can be trusted with DMA at any point in time
187 * (so we should enable DMA only on one of the two interfaces).
189 * FIXME: At this point we haven't probed the drives so we can't make
190 * the appropriate decision. Really we should defer this problem until
191 * we tune the drive then try to grab DMA ownership if we want to be
192 * the DMA end. This has to be become dynamic to handle hot-plug.
194 dma_stat
= hwif
->INB(dma_base
+ 2);
195 if ((dma_stat
& 0x80) && hwif
->mate
&& hwif
->mate
->dma_base
) {
196 printk(KERN_INFO
"%s: simplex device: DMA disabled\n", d
->name
);
202 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
204 void ide_setup_pci_noise(struct pci_dev
*dev
, const struct ide_port_info
*d
)
206 printk(KERN_INFO
"%s: IDE controller (0x%04x:0x%04x rev 0x%02x) at "
207 " PCI slot %s\n", d
->name
, dev
->vendor
, dev
->device
,
208 dev
->revision
, pci_name(dev
));
211 EXPORT_SYMBOL_GPL(ide_setup_pci_noise
);
215 * ide_pci_enable - do PCI enables
219 * Enable the IDE PCI device. We attempt to enable the device in full
220 * but if that fails then we only need IO space. The PCI code should
221 * have setup the proper resources for us already for controllers in
224 * Returns zero on success or an error code
227 static int ide_pci_enable(struct pci_dev
*dev
, const struct ide_port_info
*d
)
231 if (pci_enable_device(dev
)) {
232 ret
= pci_enable_device_io(dev
);
234 printk(KERN_WARNING
"%s: (ide_setup_pci_device:) "
235 "Could not enable device.\n", d
->name
);
238 printk(KERN_WARNING
"%s: BIOS configuration fixed.\n", d
->name
);
242 * assume all devices can do 32-bit DMA for now, we can add
243 * a DMA mask field to the struct ide_port_info if we need it
244 * (or let lower level driver set the DMA mask)
246 ret
= pci_set_dma_mask(dev
, DMA_32BIT_MASK
);
248 printk(KERN_ERR
"%s: can't set dma mask\n", d
->name
);
252 /* FIXME: Temporary - until we put in the hotplug interface logic
253 Check that the bits we want are not in use by someone else. */
254 ret
= pci_request_region(dev
, 4, "ide_tmp");
258 pci_release_region(dev
, 4);
264 * ide_pci_configure - configure an unconfigured device
268 * Enable and configure the PCI device we have been passed.
269 * Returns zero on success or an error code.
272 static int ide_pci_configure(struct pci_dev
*dev
, const struct ide_port_info
*d
)
276 * PnP BIOS was *supposed* to have setup this device, but we
277 * can do it ourselves, so long as the BIOS has assigned an IRQ
278 * (or possibly the device is using a "legacy header" for IRQs).
279 * Maybe the user deliberately *disabled* the device,
280 * but we'll eventually ignore it again if no drives respond.
282 if (ide_setup_pci_baseregs(dev
, d
->name
) || pci_write_config_word(dev
, PCI_COMMAND
, pcicmd
|PCI_COMMAND_IO
))
284 printk(KERN_INFO
"%s: device disabled (BIOS)\n", d
->name
);
287 if (pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
)) {
288 printk(KERN_ERR
"%s: error accessing PCI regs\n", d
->name
);
291 if (!(pcicmd
& PCI_COMMAND_IO
)) {
292 printk(KERN_ERR
"%s: unable to enable IDE controller\n", d
->name
);
299 * ide_pci_check_iomem - check a register is I/O
304 * Checks if a BAR is configured and points to MMIO space. If so
305 * print an error and return an error code. Otherwise return 0
308 static int ide_pci_check_iomem(struct pci_dev
*dev
, const struct ide_port_info
*d
, int bar
)
310 ulong flags
= pci_resource_flags(dev
, bar
);
313 if (!flags
|| pci_resource_len(dev
, bar
) == 0)
317 if(flags
& PCI_BASE_ADDRESS_IO_MASK
)
321 printk(KERN_ERR
"%s: IO baseregs (BIOS) are reported "
323 "<andre@linux-ide.org>.\n", d
->name
);
328 * ide_hwif_configure - configure an IDE interface
329 * @dev: PCI device holding interface
334 * Perform the initial set up for the hardware interface structure. This
335 * is done per interface port rather than per PCI device. There may be
336 * more than one port per device.
338 * Returns the new hardware interface structure, or NULL on a failure
341 static ide_hwif_t
*ide_hwif_configure(struct pci_dev
*dev
,
342 const struct ide_port_info
*d
,
343 unsigned int port
, int irq
)
345 unsigned long ctl
= 0, base
= 0;
347 u8 bootable
= (d
->host_flags
& IDE_HFLAG_BOOTABLE
) ? 1 : 0;
351 if ((d
->host_flags
& IDE_HFLAG_ISA_PORTS
) == 0) {
352 /* Possibly we should fail if these checks report true */
353 ide_pci_check_iomem(dev
, d
, 2*port
);
354 ide_pci_check_iomem(dev
, d
, 2*port
+1);
356 ctl
= pci_resource_start(dev
, 2*port
+1);
357 base
= pci_resource_start(dev
, 2*port
);
358 if ((ctl
&& !base
) || (base
&& !ctl
)) {
359 printk(KERN_ERR
"%s: inconsistent baseregs (BIOS) "
360 "for port %d, skipping\n", d
->name
, port
);
366 /* Use default values */
367 ctl
= port
? 0x374 : 0x3f4;
368 base
= port
? 0x170 : 0x1f0;
370 if ((hwif
= ide_match_hwif(base
, bootable
, d
->name
)) == NULL
)
371 return NULL
; /* no room in ide_hwifs[] */
373 memset(&hw
, 0, sizeof(hw
));
374 hw
.irq
= hwif
->irq
? hwif
->irq
: irq
;
376 hw
.chipset
= d
->chipset
? d
->chipset
: ide_pci
;
377 ide_std_init_ports(&hw
, base
, ctl
| 2);
379 if (hwif
->io_ports
[IDE_DATA_OFFSET
] == base
&&
380 hwif
->io_ports
[IDE_CONTROL_OFFSET
] == (ctl
| 2))
381 oldnoprobe
= hwif
->noprobe
;
383 ide_init_port_hw(hwif
, &hw
);
385 hwif
->noprobe
= oldnoprobe
;
387 hwif
->dev
= &dev
->dev
;
393 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
395 * ide_hwif_setup_dma - configure DMA interface
396 * @hwif: IDE interface
399 * Set up the DMA base for the interface. Enable the master bits as
400 * necessary and attempt to bring the device DMA into a ready to use
404 void ide_hwif_setup_dma(ide_hwif_t
*hwif
, const struct ide_port_info
*d
)
406 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
409 pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
);
411 if ((d
->host_flags
& IDE_HFLAG_NO_AUTODMA
) == 0 ||
412 ((dev
->class >> 8) == PCI_CLASS_STORAGE_IDE
&&
413 (dev
->class & 0x80))) {
414 unsigned long dma_base
= ide_get_or_set_dma_base(d
, hwif
);
415 if (dma_base
&& !(pcicmd
& PCI_COMMAND_MASTER
)) {
417 * Set up BM-DMA capability
418 * (PnP BIOS should have done this)
421 if (pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
) || !(pcicmd
& PCI_COMMAND_MASTER
)) {
422 printk(KERN_ERR
"%s: %s error updating PCICMD\n",
423 hwif
->name
, d
->name
);
429 d
->init_dma(hwif
, dma_base
);
431 ide_setup_dma(hwif
, dma_base
);
434 printk(KERN_INFO
"%s: %s Bus-Master DMA disabled "
435 "(BIOS)\n", hwif
->name
, d
->name
);
439 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
442 * ide_setup_pci_controller - set up IDE PCI
445 * @noisy: verbose flag
446 * @config: returned as 1 if we configured the hardware
448 * Set up the PCI and controller side of the IDE interface. This brings
449 * up the PCI side of the device, checks that the device is enabled
450 * and enables it if need be
453 static int ide_setup_pci_controller(struct pci_dev
*dev
, const struct ide_port_info
*d
, int noisy
, int *config
)
459 ide_setup_pci_noise(dev
, d
);
461 ret
= ide_pci_enable(dev
, d
);
465 ret
= pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
);
467 printk(KERN_ERR
"%s: error accessing PCI regs\n", d
->name
);
470 if (!(pcicmd
& PCI_COMMAND_IO
)) { /* is device disabled? */
471 ret
= ide_pci_configure(dev
, d
);
475 printk(KERN_INFO
"%s: device enabled (Linux)\n", d
->name
);
483 * ide_pci_setup_ports - configure ports/devices on PCI IDE
487 * @idx: ATA index table to update
489 * Scan the interfaces attached to this device and do any
490 * necessary per port setup. Attach the devices and ask the
491 * generic DMA layer to do its work for us.
493 * Normally called automaticall from do_ide_pci_setup_device,
494 * but is also used directly as a helper function by some controllers
495 * where the chipset setup is not the default PCI IDE one.
498 void ide_pci_setup_ports(struct pci_dev
*dev
, const struct ide_port_info
*d
, int pciirq
, u8
*idx
)
500 int channels
= (d
->host_flags
& IDE_HFLAG_SINGLE
) ? 1 : 2, port
;
505 * Set up the IDE ports
508 for (port
= 0; port
< channels
; ++port
) {
509 const ide_pci_enablebit_t
*e
= &(d
->enablebits
[port
]);
511 if (e
->reg
&& (pci_read_config_byte(dev
, e
->reg
, &tmp
) ||
512 (tmp
& e
->mask
) != e
->val
)) {
513 printk(KERN_INFO
"%s: IDE port disabled\n", d
->name
);
514 continue; /* port not enabled */
517 hwif
= ide_hwif_configure(dev
, d
, port
, pciirq
);
521 *(idx
+ port
) = hwif
->index
;
525 EXPORT_SYMBOL_GPL(ide_pci_setup_ports
);
528 * ide_setup_pci_device() looks at the primary/secondary interfaces
529 * on a PCI IDE device and, if they are enabled, prepares the IDE driver
530 * for use with them. This generic code works for most PCI chipsets.
532 * One thing that is not standardized is the location of the
533 * primary/secondary interface "enable/disable" bits. For chipsets that
534 * we "know" about, this information is in the struct ide_port_info;
535 * for all other chipsets, we just assume both interfaces are enabled.
537 static int do_ide_setup_pci_device(struct pci_dev
*dev
,
538 const struct ide_port_info
*d
,
541 int tried_config
= 0;
544 ret
= ide_setup_pci_controller(dev
, d
, noisy
, &tried_config
);
549 * Can we trust the reported IRQ?
553 /* Is it an "IDE storage" device in non-PCI mode? */
554 if ((dev
->class >> 8) == PCI_CLASS_STORAGE_IDE
&& (dev
->class & 5) != 5) {
556 printk(KERN_INFO
"%s: not 100%% native mode: "
557 "will probe irqs later\n", d
->name
);
559 * This allows offboard ide-pci cards the enable a BIOS,
560 * verify interrupt settings of split-mirror pci-config
561 * space, place chipset into init-mode, and/or preserve
562 * an interrupt if the card is not native ide support.
564 ret
= d
->init_chipset
? d
->init_chipset(dev
, d
->name
) : 0;
568 } else if (tried_config
) {
570 printk(KERN_INFO
"%s: will probe irqs later\n", d
->name
);
572 } else if (!pciirq
) {
574 printk(KERN_WARNING
"%s: bad irq (%d): will probe later\n",
578 if (d
->init_chipset
) {
579 ret
= d
->init_chipset(dev
, d
->name
);
584 printk(KERN_INFO
"%s: 100%% native mode on irq %d\n",
588 /* FIXME: silent failure can happen */
590 ide_pci_setup_ports(dev
, d
, pciirq
, idx
);
595 int ide_setup_pci_device(struct pci_dev
*dev
, const struct ide_port_info
*d
)
597 u8 idx
[4] = { 0xff, 0xff, 0xff, 0xff };
600 ret
= do_ide_setup_pci_device(dev
, d
, &idx
[0], 1);
603 ide_device_add(idx
, d
);
608 EXPORT_SYMBOL_GPL(ide_setup_pci_device
);
610 int ide_setup_pci_devices(struct pci_dev
*dev1
, struct pci_dev
*dev2
,
611 const struct ide_port_info
*d
)
613 struct pci_dev
*pdev
[] = { dev1
, dev2
};
615 u8 idx
[4] = { 0xff, 0xff, 0xff, 0xff };
617 for (i
= 0; i
< 2; i
++) {
618 ret
= do_ide_setup_pci_device(pdev
[i
], d
, &idx
[i
*2], !i
);
620 * FIXME: Mom, mom, they stole me the helper function to undo
621 * do_ide_setup_pci_device() on the first device!
627 ide_device_add(idx
, d
);
632 EXPORT_SYMBOL_GPL(ide_setup_pci_devices
);
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