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: device not capable of full "
43 "native PCI mode\n", name
);
46 printk("%s: placing both ports into native PCI mode\n", name
);
47 (void) pci_write_config_byte(dev
, PCI_CLASS_PROG
, progif
|5);
48 if (pci_read_config_byte(dev
, PCI_CLASS_PROG
, &progif
) ||
50 printk(KERN_ERR
"%s: rewrite of PROGIF failed, wanted "
51 "0x%04x, got 0x%04x\n",
52 name
, progif
|5, progif
);
59 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
60 static void ide_pci_clear_simplex(unsigned long dma_base
, const char *name
)
62 u8 dma_stat
= inb(dma_base
+ 2);
64 outb(dma_stat
& 0x60, dma_base
+ 2);
65 dma_stat
= inb(dma_base
+ 2);
67 printk(KERN_INFO
"%s: simplex device: DMA forced\n", name
);
71 * ide_pci_dma_base - setup BMIBA
72 * @hwif: IDE interface
75 * Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space.
76 * Where a device has a partner that is already in DMA mode we check
77 * and enforce IDE simplex rules.
80 unsigned long ide_pci_dma_base(ide_hwif_t
*hwif
, const struct ide_port_info
*d
)
82 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
83 unsigned long dma_base
= 0;
86 if (hwif
->host_flags
& IDE_HFLAG_MMIO
)
87 return hwif
->dma_base
;
89 if (hwif
->mate
&& hwif
->mate
->dma_base
) {
90 dma_base
= hwif
->mate
->dma_base
- (hwif
->channel
? 0 : 8);
92 u8 baridx
= (d
->host_flags
& IDE_HFLAG_CS5520
) ? 2 : 4;
94 dma_base
= pci_resource_start(dev
, baridx
);
97 printk(KERN_ERR
"%s: DMA base is invalid\n", d
->name
);
105 if (d
->host_flags
& IDE_HFLAG_CS5520
)
108 if (d
->host_flags
& IDE_HFLAG_CLEAR_SIMPLEX
) {
109 ide_pci_clear_simplex(dma_base
, d
->name
);
114 * If the device claims "simplex" DMA, this means that only one of
115 * the two interfaces can be trusted with DMA at any point in time
116 * (so we should enable DMA only on one of the two interfaces).
118 * FIXME: At this point we haven't probed the drives so we can't make
119 * the appropriate decision. Really we should defer this problem until
120 * we tune the drive then try to grab DMA ownership if we want to be
121 * the DMA end. This has to be become dynamic to handle hot-plug.
123 dma_stat
= hwif
->INB(dma_base
+ 2);
124 if ((dma_stat
& 0x80) && hwif
->mate
&& hwif
->mate
->dma_base
) {
125 printk(KERN_INFO
"%s: simplex device: DMA disabled\n", d
->name
);
131 EXPORT_SYMBOL_GPL(ide_pci_dma_base
);
134 * Set up BM-DMA capability (PnP BIOS should have done this)
136 int ide_pci_set_master(struct pci_dev
*dev
, const char *name
)
140 pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
);
142 if ((pcicmd
& PCI_COMMAND_MASTER
) == 0) {
145 if (pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
) ||
146 (pcicmd
& PCI_COMMAND_MASTER
) == 0) {
147 printk(KERN_ERR
"%s: error updating PCICMD on %s\n",
148 name
, pci_name(dev
));
155 EXPORT_SYMBOL_GPL(ide_pci_set_master
);
156 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
158 void ide_setup_pci_noise(struct pci_dev
*dev
, const struct ide_port_info
*d
)
160 printk(KERN_INFO
"%s: IDE controller (0x%04x:0x%04x rev 0x%02x) at "
161 " PCI slot %s\n", d
->name
, dev
->vendor
, dev
->device
,
162 dev
->revision
, pci_name(dev
));
164 EXPORT_SYMBOL_GPL(ide_setup_pci_noise
);
168 * ide_pci_enable - do PCI enables
172 * Enable the IDE PCI device. We attempt to enable the device in full
173 * but if that fails then we only need IO space. The PCI code should
174 * have setup the proper resources for us already for controllers in
177 * Returns zero on success or an error code
180 static int ide_pci_enable(struct pci_dev
*dev
, const struct ide_port_info
*d
)
184 if (pci_enable_device(dev
)) {
185 ret
= pci_enable_device_io(dev
);
187 printk(KERN_WARNING
"%s: (ide_setup_pci_device:) "
188 "Could not enable device.\n", d
->name
);
191 printk(KERN_WARNING
"%s: BIOS configuration fixed.\n", d
->name
);
195 * assume all devices can do 32-bit DMA for now, we can add
196 * a DMA mask field to the struct ide_port_info if we need it
197 * (or let lower level driver set the DMA mask)
199 ret
= pci_set_dma_mask(dev
, DMA_32BIT_MASK
);
201 printk(KERN_ERR
"%s: can't set dma mask\n", d
->name
);
205 if (d
->host_flags
& IDE_HFLAG_SINGLE
)
210 if ((d
->host_flags
& IDE_HFLAG_NO_DMA
) == 0) {
211 if (d
->host_flags
& IDE_HFLAG_CS5520
)
217 ret
= pci_request_selected_regions(dev
, bars
, d
->name
);
219 printk(KERN_ERR
"%s: can't reserve resources\n", d
->name
);
225 * ide_pci_configure - configure an unconfigured device
229 * Enable and configure the PCI device we have been passed.
230 * Returns zero on success or an error code.
233 static int ide_pci_configure(struct pci_dev
*dev
, const struct ide_port_info
*d
)
237 * PnP BIOS was *supposed* to have setup this device, but we
238 * can do it ourselves, so long as the BIOS has assigned an IRQ
239 * (or possibly the device is using a "legacy header" for IRQs).
240 * Maybe the user deliberately *disabled* the device,
241 * but we'll eventually ignore it again if no drives respond.
243 if (ide_setup_pci_baseregs(dev
, d
->name
) ||
244 pci_write_config_word(dev
, PCI_COMMAND
, pcicmd
| PCI_COMMAND_IO
)) {
245 printk(KERN_INFO
"%s: device disabled (BIOS)\n", d
->name
);
248 if (pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
)) {
249 printk(KERN_ERR
"%s: error accessing PCI regs\n", d
->name
);
252 if (!(pcicmd
& PCI_COMMAND_IO
)) {
253 printk(KERN_ERR
"%s: unable to enable IDE controller\n", d
->name
);
260 * ide_pci_check_iomem - check a register is I/O
265 * Checks if a BAR is configured and points to MMIO space. If so,
266 * return an error code. Otherwise return 0
269 static int ide_pci_check_iomem(struct pci_dev
*dev
, const struct ide_port_info
*d
,
272 ulong flags
= pci_resource_flags(dev
, bar
);
275 if (!flags
|| pci_resource_len(dev
, bar
) == 0)
279 if (flags
& IORESOURCE_IO
)
287 * ide_hwif_configure - configure an IDE interface
288 * @dev: PCI device holding interface
293 * Perform the initial set up for the hardware interface structure. This
294 * is done per interface port rather than per PCI device. There may be
295 * more than one port per device.
297 * Returns the new hardware interface structure, or NULL on a failure
300 static ide_hwif_t
*ide_hwif_configure(struct pci_dev
*dev
,
301 const struct ide_port_info
*d
,
302 unsigned int port
, int irq
)
304 unsigned long ctl
= 0, base
= 0;
308 if ((d
->host_flags
& IDE_HFLAG_ISA_PORTS
) == 0) {
309 if (ide_pci_check_iomem(dev
, d
, 2 * port
) ||
310 ide_pci_check_iomem(dev
, d
, 2 * port
+ 1)) {
311 printk(KERN_ERR
"%s: I/O baseregs (BIOS) are reported "
312 "as MEM for port %d!\n", d
->name
, port
);
316 ctl
= pci_resource_start(dev
, 2*port
+1);
317 base
= pci_resource_start(dev
, 2*port
);
319 /* Use default values */
320 ctl
= port
? 0x374 : 0x3f4;
321 base
= port
? 0x170 : 0x1f0;
325 printk(KERN_ERR
"%s: bad PCI BARs for port %d, skipping\n",
330 hwif
= ide_find_port_slot(d
);
334 memset(&hw
, 0, sizeof(hw
));
337 hw
.chipset
= d
->chipset
? d
->chipset
: ide_pci
;
338 ide_std_init_ports(&hw
, base
, ctl
| 2);
340 ide_init_port_hw(hwif
, &hw
);
345 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
347 * ide_hwif_setup_dma - configure DMA interface
348 * @hwif: IDE interface
351 * Set up the DMA base for the interface. Enable the master bits as
352 * necessary and attempt to bring the device DMA into a ready to use
356 int ide_hwif_setup_dma(ide_hwif_t
*hwif
, const struct ide_port_info
*d
)
358 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
360 if ((d
->host_flags
& IDE_HFLAG_NO_AUTODMA
) == 0 ||
361 ((dev
->class >> 8) == PCI_CLASS_STORAGE_IDE
&&
362 (dev
->class & 0x80))) {
363 unsigned long base
= ide_pci_dma_base(hwif
, d
);
365 if (base
== 0 || ide_pci_set_master(dev
, d
->name
) < 0)
368 if (hwif
->host_flags
& IDE_HFLAG_MMIO
)
369 printk(KERN_INFO
" %s: MMIO-DMA\n", hwif
->name
);
371 printk(KERN_INFO
" %s: BM-DMA at 0x%04lx-0x%04lx\n",
372 hwif
->name
, base
, base
+ 7);
374 hwif
->extra_base
= base
+ (hwif
->channel
? 8 : 16);
376 if (ide_allocate_dma_engine(hwif
))
379 ide_setup_dma(hwif
, base
);
384 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
387 * ide_setup_pci_controller - set up IDE PCI
390 * @noisy: verbose flag
391 * @config: returned as 1 if we configured the hardware
393 * Set up the PCI and controller side of the IDE interface. This brings
394 * up the PCI side of the device, checks that the device is enabled
395 * and enables it if need be
398 static int ide_setup_pci_controller(struct pci_dev
*dev
, const struct ide_port_info
*d
, int noisy
, int *config
)
404 ide_setup_pci_noise(dev
, d
);
406 ret
= ide_pci_enable(dev
, d
);
410 ret
= pci_read_config_word(dev
, PCI_COMMAND
, &pcicmd
);
412 printk(KERN_ERR
"%s: error accessing PCI regs\n", d
->name
);
415 if (!(pcicmd
& PCI_COMMAND_IO
)) { /* is device disabled? */
416 ret
= ide_pci_configure(dev
, d
);
420 printk(KERN_INFO
"%s: device enabled (Linux)\n", d
->name
);
428 * ide_pci_setup_ports - configure ports/devices on PCI IDE
432 * @idx: ATA index table to update
434 * Scan the interfaces attached to this device and do any
435 * necessary per port setup. Attach the devices and ask the
436 * generic DMA layer to do its work for us.
438 * Normally called automaticall from do_ide_pci_setup_device,
439 * but is also used directly as a helper function by some controllers
440 * where the chipset setup is not the default PCI IDE one.
443 void ide_pci_setup_ports(struct pci_dev
*dev
, const struct ide_port_info
*d
, int pciirq
, u8
*idx
)
445 int channels
= (d
->host_flags
& IDE_HFLAG_SINGLE
) ? 1 : 2, port
;
450 * Set up the IDE ports
453 for (port
= 0; port
< channels
; ++port
) {
454 const ide_pci_enablebit_t
*e
= &(d
->enablebits
[port
]);
456 if (e
->reg
&& (pci_read_config_byte(dev
, e
->reg
, &tmp
) ||
457 (tmp
& e
->mask
) != e
->val
)) {
458 printk(KERN_INFO
"%s: IDE port disabled\n", d
->name
);
459 continue; /* port not enabled */
462 hwif
= ide_hwif_configure(dev
, d
, port
, pciirq
);
466 *(idx
+ port
) = hwif
->index
;
469 EXPORT_SYMBOL_GPL(ide_pci_setup_ports
);
472 * ide_setup_pci_device() looks at the primary/secondary interfaces
473 * on a PCI IDE device and, if they are enabled, prepares the IDE driver
474 * for use with them. This generic code works for most PCI chipsets.
476 * One thing that is not standardized is the location of the
477 * primary/secondary interface "enable/disable" bits. For chipsets that
478 * we "know" about, this information is in the struct ide_port_info;
479 * for all other chipsets, we just assume both interfaces are enabled.
481 static int do_ide_setup_pci_device(struct pci_dev
*dev
,
482 const struct ide_port_info
*d
,
485 int tried_config
= 0;
488 ret
= ide_setup_pci_controller(dev
, d
, noisy
, &tried_config
);
493 * Can we trust the reported IRQ?
497 /* Is it an "IDE storage" device in non-PCI mode? */
498 if ((dev
->class >> 8) == PCI_CLASS_STORAGE_IDE
&& (dev
->class & 5) != 5) {
500 printk(KERN_INFO
"%s: not 100%% native mode: "
501 "will probe irqs later\n", d
->name
);
503 * This allows offboard ide-pci cards the enable a BIOS,
504 * verify interrupt settings of split-mirror pci-config
505 * space, place chipset into init-mode, and/or preserve
506 * an interrupt if the card is not native ide support.
508 ret
= d
->init_chipset
? d
->init_chipset(dev
, d
->name
) : 0;
512 } else if (tried_config
) {
514 printk(KERN_INFO
"%s: will probe irqs later\n", d
->name
);
516 } else if (!pciirq
) {
518 printk(KERN_WARNING
"%s: bad irq (%d): will probe later\n",
522 if (d
->init_chipset
) {
523 ret
= d
->init_chipset(dev
, d
->name
);
528 printk(KERN_INFO
"%s: 100%% native mode on irq %d\n",
532 /* FIXME: silent failure can happen */
534 ide_pci_setup_ports(dev
, d
, pciirq
, idx
);
539 int ide_setup_pci_device(struct pci_dev
*dev
, const struct ide_port_info
*d
)
541 u8 idx
[4] = { 0xff, 0xff, 0xff, 0xff };
544 ret
= do_ide_setup_pci_device(dev
, d
, &idx
[0], 1);
547 ide_device_add(idx
, d
);
551 EXPORT_SYMBOL_GPL(ide_setup_pci_device
);
553 int ide_setup_pci_devices(struct pci_dev
*dev1
, struct pci_dev
*dev2
,
554 const struct ide_port_info
*d
)
556 struct pci_dev
*pdev
[] = { dev1
, dev2
};
558 u8 idx
[4] = { 0xff, 0xff, 0xff, 0xff };
560 for (i
= 0; i
< 2; i
++) {
561 ret
= do_ide_setup_pci_device(pdev
[i
], d
, &idx
[i
*2], !i
);
563 * FIXME: Mom, mom, they stole me the helper function to undo
564 * do_ide_setup_pci_device() on the first device!
570 ide_device_add(idx
, d
);
574 EXPORT_SYMBOL_GPL(ide_setup_pci_devices
);
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