2 * Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
3 * Copyright (C) 1995-1998 Mark Lord
4 * Copyright (C) 2007-2009 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/export.h>
12 #include <linux/pci.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/ide.h>
16 #include <linux/dma-mapping.h>
21 * ide_setup_pci_baseregs - place a PCI IDE controller native
22 * @dev: PCI device of interface to switch native
23 * @name: Name of interface
25 * We attempt to place the PCI interface into PCI native mode. If
26 * we succeed the BARs are ok and the controller is in PCI mode.
27 * Returns 0 on success or an errno code.
29 * FIXME: if we program the interface and then fail to set the BARS
30 * we don't switch it back to legacy mode. Do we actually care ??
33 static int ide_setup_pci_baseregs(struct pci_dev *dev, const char *name)
38 * Place both IDE interfaces into PCI "native" mode:
40 if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
42 if ((progif & 0xa) != 0xa) {
43 printk(KERN_INFO "%s %s: device not capable of full "
44 "native PCI mode\n", name, pci_name(dev));
47 printk(KERN_INFO "%s %s: placing both ports into native PCI "
48 "mode\n", name, pci_name(dev));
49 (void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5);
50 if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
52 printk(KERN_ERR "%s %s: rewrite of PROGIF failed, "
53 "wanted 0x%04x, got 0x%04x\n",
54 name, pci_name(dev), progif | 5, progif);
61 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
62 static int ide_pci_clear_simplex(unsigned long dma_base, const char *name)
64 u8 dma_stat = inb(dma_base + 2);
66 outb(dma_stat & 0x60, dma_base + 2);
67 dma_stat = inb(dma_base + 2);
69 return (dma_stat & 0x80) ? 1 : 0;
73 * ide_pci_dma_base - setup BMIBA
74 * @hwif: IDE interface
77 * Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space.
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;
85 if (hwif->host_flags & IDE_HFLAG_MMIO)
86 return hwif->dma_base;
88 if (hwif->mate && hwif->mate->dma_base) {
89 dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8);
91 u8 baridx = (d->host_flags & IDE_HFLAG_CS5520) ? 2 : 4;
93 dma_base = pci_resource_start(dev, baridx);
96 printk(KERN_ERR "%s %s: DMA base is invalid\n",
97 d->name, pci_name(dev));
107 EXPORT_SYMBOL_GPL(ide_pci_dma_base);
109 int ide_pci_check_simplex(ide_hwif_t *hwif, const struct ide_port_info *d)
111 struct pci_dev *dev = to_pci_dev(hwif->dev);
114 if (d->host_flags & (IDE_HFLAG_MMIO | IDE_HFLAG_CS5520))
117 if (d->host_flags & IDE_HFLAG_CLEAR_SIMPLEX) {
118 if (ide_pci_clear_simplex(hwif->dma_base, d->name))
119 printk(KERN_INFO "%s %s: simplex device: DMA forced\n",
120 d->name, pci_name(dev));
125 * If the device claims "simplex" DMA, this means that only one of
126 * the two interfaces can be trusted with DMA at any point in time
127 * (so we should enable DMA only on one of the two interfaces).
129 * FIXME: At this point we haven't probed the drives so we can't make
130 * the appropriate decision. Really we should defer this problem until
131 * we tune the drive then try to grab DMA ownership if we want to be
132 * the DMA end. This has to be become dynamic to handle hot-plug.
134 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
135 if ((dma_stat & 0x80) && hwif->mate && hwif->mate->dma_base) {
136 printk(KERN_INFO "%s %s: simplex device: DMA disabled\n",
137 d->name, pci_name(dev));
143 EXPORT_SYMBOL_GPL(ide_pci_check_simplex);
146 * Set up BM-DMA capability (PnP BIOS should have done this)
148 int ide_pci_set_master(struct pci_dev *dev, const char *name)
152 pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
154 if ((pcicmd & PCI_COMMAND_MASTER) == 0) {
157 if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) ||
158 (pcicmd & PCI_COMMAND_MASTER) == 0) {
159 printk(KERN_ERR "%s %s: error updating PCICMD\n",
160 name, pci_name(dev));
167 EXPORT_SYMBOL_GPL(ide_pci_set_master);
168 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
170 void ide_setup_pci_noise(struct pci_dev *dev, const struct ide_port_info *d)
172 printk(KERN_INFO "%s %s: IDE controller (0x%04x:0x%04x rev 0x%02x)\n",
173 d->name, pci_name(dev),
174 dev->vendor, dev->device, dev->revision);
176 EXPORT_SYMBOL_GPL(ide_setup_pci_noise);
180 * ide_pci_enable - do PCI enables
184 * Enable the IDE PCI device. We attempt to enable the device in full
185 * but if that fails then we only need IO space. The PCI code should
186 * have setup the proper resources for us already for controllers in
189 * Returns zero on success or an error code
192 static int ide_pci_enable(struct pci_dev *dev, const struct ide_port_info *d)
196 if (pci_enable_device(dev)) {
197 ret = pci_enable_device_io(dev);
199 printk(KERN_WARNING "%s %s: couldn't enable device\n",
200 d->name, pci_name(dev));
203 printk(KERN_WARNING "%s %s: BIOS configuration fixed\n",
204 d->name, pci_name(dev));
208 * assume all devices can do 32-bit DMA for now, we can add
209 * a DMA mask field to the struct ide_port_info if we need it
210 * (or let lower level driver set the DMA mask)
212 ret = dma_set_mask(&dev->dev, DMA_BIT_MASK(32));
214 printk(KERN_ERR "%s %s: can't set DMA mask\n",
215 d->name, pci_name(dev));
219 if (d->host_flags & IDE_HFLAG_SINGLE)
224 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
225 if (d->host_flags & IDE_HFLAG_CS5520)
231 ret = pci_request_selected_regions(dev, bars, d->name);
233 printk(KERN_ERR "%s %s: can't reserve resources\n",
234 d->name, pci_name(dev));
240 * ide_pci_configure - configure an unconfigured device
244 * Enable and configure the PCI device we have been passed.
245 * Returns zero on success or an error code.
248 static int ide_pci_configure(struct pci_dev *dev, const struct ide_port_info *d)
252 * PnP BIOS was *supposed* to have setup this device, but we
253 * can do it ourselves, so long as the BIOS has assigned an IRQ
254 * (or possibly the device is using a "legacy header" for IRQs).
255 * Maybe the user deliberately *disabled* the device,
256 * but we'll eventually ignore it again if no drives respond.
258 if (ide_setup_pci_baseregs(dev, d->name) ||
259 pci_write_config_word(dev, PCI_COMMAND, pcicmd | PCI_COMMAND_IO)) {
260 printk(KERN_INFO "%s %s: device disabled (BIOS)\n",
261 d->name, pci_name(dev));
264 if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
265 printk(KERN_ERR "%s %s: error accessing PCI regs\n",
266 d->name, pci_name(dev));
269 if (!(pcicmd & PCI_COMMAND_IO)) {
270 printk(KERN_ERR "%s %s: unable to enable IDE controller\n",
271 d->name, pci_name(dev));
278 * ide_pci_check_iomem - check a register is I/O
283 * Checks if a BAR is configured and points to MMIO space. If so,
284 * return an error code. Otherwise return 0
287 static int ide_pci_check_iomem(struct pci_dev *dev, const struct ide_port_info *d,
290 ulong flags = pci_resource_flags(dev, bar);
293 if (!flags || pci_resource_len(dev, bar) == 0)
297 if (flags & IORESOURCE_IO)
305 * ide_hw_configure - configure a struct ide_hw instance
306 * @dev: PCI device holding interface
309 * @hw: struct ide_hw 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, struct ide_hw *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));
348 ide_std_init_ports(hw, base, ctl | 2);
353 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
355 * ide_hwif_setup_dma - configure DMA interface
356 * @hwif: IDE interface
359 * Set up the DMA base for the interface. Enable the master bits as
360 * necessary and attempt to bring the device DMA into a ready to use
364 int ide_hwif_setup_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
366 struct pci_dev *dev = to_pci_dev(hwif->dev);
368 if ((d->host_flags & IDE_HFLAG_NO_AUTODMA) == 0 ||
369 ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
370 (dev->class & 0x80))) {
371 unsigned long base = ide_pci_dma_base(hwif, d);
376 hwif->dma_base = base;
378 if (hwif->dma_ops == NULL)
379 hwif->dma_ops = &sff_dma_ops;
381 if (ide_pci_check_simplex(hwif, d) < 0)
384 if (ide_pci_set_master(dev, d->name) < 0)
387 if (hwif->host_flags & IDE_HFLAG_MMIO)
388 printk(KERN_INFO " %s: MMIO-DMA\n", hwif->name);
390 printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx\n",
391 hwif->name, base, base + 7);
393 hwif->extra_base = base + (hwif->channel ? 8 : 16);
395 if (ide_allocate_dma_engine(hwif))
401 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
404 * ide_setup_pci_controller - set up IDE PCI
407 * @noisy: verbose flag
409 * Set up the PCI and controller side of the IDE interface. This brings
410 * up the PCI side of the device, checks that the device is enabled
411 * and enables it if need be
414 static int ide_setup_pci_controller(struct pci_dev *dev,
415 const struct ide_port_info *d, int noisy)
421 ide_setup_pci_noise(dev, d);
423 ret = ide_pci_enable(dev, d);
427 ret = pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
429 printk(KERN_ERR "%s %s: error accessing PCI regs\n",
430 d->name, pci_name(dev));
433 if (!(pcicmd & PCI_COMMAND_IO)) { /* is device disabled? */
434 ret = ide_pci_configure(dev, d);
437 printk(KERN_INFO "%s %s: device enabled (Linux)\n",
438 d->name, pci_name(dev));
446 * ide_pci_setup_ports - configure ports/devices on PCI IDE
449 * @hw: struct ide_hw instances corresponding to this PCI IDE device
450 * @hws: struct ide_hw pointers table to update
452 * Scan the interfaces attached to this device and do any
453 * necessary per port setup. Attach the devices and ask the
454 * generic DMA layer to do its work for us.
456 * Normally called automaticall from do_ide_pci_setup_device,
457 * but is also used directly as a helper function by some controllers
458 * where the chipset setup is not the default PCI IDE one.
461 void ide_pci_setup_ports(struct pci_dev *dev, const struct ide_port_info *d,
462 struct ide_hw *hw, struct ide_hw **hws)
464 int channels = (d->host_flags & IDE_HFLAG_SINGLE) ? 1 : 2, port;
468 * Set up the IDE ports
471 for (port = 0; port < channels; ++port) {
472 const struct ide_pci_enablebit *e = &d->enablebits[port];
474 if (e->reg && (pci_read_config_byte(dev, e->reg, &tmp) ||
475 (tmp & e->mask) != e->val)) {
476 printk(KERN_INFO "%s %s: IDE port disabled\n",
477 d->name, pci_name(dev));
478 continue; /* port not enabled */
481 if (ide_hw_configure(dev, d, port, hw + port))
484 *(hws + port) = hw + port;
487 EXPORT_SYMBOL_GPL(ide_pci_setup_ports);
490 * ide_setup_pci_device() looks at the primary/secondary interfaces
491 * on a PCI IDE device and, if they are enabled, prepares the IDE driver
492 * for use with them. This generic code works for most PCI chipsets.
494 * One thing that is not standardized is the location of the
495 * primary/secondary interface "enable/disable" bits. For chipsets that
496 * we "know" about, this information is in the struct ide_port_info;
497 * for all other chipsets, we just assume both interfaces are enabled.
499 static int do_ide_setup_pci_device(struct pci_dev *dev,
500 const struct ide_port_info *d,
506 * Can we trust the reported IRQ?
511 * This allows offboard ide-pci cards the enable a BIOS,
512 * verify interrupt settings of split-mirror pci-config
513 * space, place chipset into init-mode, and/or preserve
514 * an interrupt if the card is not native ide support.
516 ret = d->init_chipset ? d->init_chipset(dev) : 0;
520 if (ide_pci_is_in_compatibility_mode(dev)) {
522 printk(KERN_INFO "%s %s: not 100%% native mode: will "
523 "probe irqs later\n", d->name, pci_name(dev));
525 } else if (!pciirq && noisy) {
526 printk(KERN_WARNING "%s %s: bad irq (%d): will probe later\n",
527 d->name, pci_name(dev), pciirq);
529 printk(KERN_INFO "%s %s: 100%% native mode on irq %d\n",
530 d->name, pci_name(dev), pciirq);
538 int ide_pci_init_two(struct pci_dev *dev1, struct pci_dev *dev2,
539 const struct ide_port_info *d, void *priv)
541 struct pci_dev *pdev[] = { dev1, dev2 };
542 struct ide_host *host;
543 int ret, i, n_ports = dev2 ? 4 : 2;
544 struct ide_hw hw[4], *hws[] = { NULL, NULL, NULL, NULL };
546 for (i = 0; i < n_ports / 2; i++) {
547 ret = ide_setup_pci_controller(pdev[i], d, !i);
551 ide_pci_setup_ports(pdev[i], d, &hw[i*2], &hws[i*2]);
554 host = ide_host_alloc(d, hws, n_ports);
560 host->dev[0] = &dev1->dev;
562 host->dev[1] = &dev2->dev;
564 host->host_priv = priv;
565 host->irq_flags = IRQF_SHARED;
567 pci_set_drvdata(pdev[0], host);
569 pci_set_drvdata(pdev[1], host);
571 for (i = 0; i < n_ports / 2; i++) {
572 ret = do_ide_setup_pci_device(pdev[i], d, !i);
575 * FIXME: Mom, mom, they stole me the helper function to undo
576 * do_ide_setup_pci_device() on the first device!
582 if (ide_pci_is_in_compatibility_mode(pdev[i])) {
583 hw[i*2].irq = pci_get_legacy_ide_irq(pdev[i], 0);
584 hw[i*2 + 1].irq = pci_get_legacy_ide_irq(pdev[i], 1);
586 hw[i*2 + 1].irq = hw[i*2].irq = ret;
589 ret = ide_host_register(host, d, hws);
595 EXPORT_SYMBOL_GPL(ide_pci_init_two);
597 int ide_pci_init_one(struct pci_dev *dev, const struct ide_port_info *d,
600 return ide_pci_init_two(dev, NULL, d, priv);
602 EXPORT_SYMBOL_GPL(ide_pci_init_one);
604 void ide_pci_remove(struct pci_dev *dev)
606 struct ide_host *host = pci_get_drvdata(dev);
607 struct pci_dev *dev2 = host->dev[1] ? to_pci_dev(host->dev[1]) : NULL;
610 if (host->host_flags & IDE_HFLAG_SINGLE)
615 if ((host->host_flags & IDE_HFLAG_NO_DMA) == 0) {
616 if (host->host_flags & IDE_HFLAG_CS5520)
622 ide_host_remove(host);
625 pci_release_selected_regions(dev2, bars);
626 pci_release_selected_regions(dev, bars);
629 pci_disable_device(dev2);
630 pci_disable_device(dev);
632 EXPORT_SYMBOL_GPL(ide_pci_remove);
635 int ide_pci_suspend(struct pci_dev *dev, pm_message_t state)
638 pci_disable_device(dev);
639 pci_set_power_state(dev, pci_choose_state(dev, state));
643 EXPORT_SYMBOL_GPL(ide_pci_suspend);
645 int ide_pci_resume(struct pci_dev *dev)
647 struct ide_host *host = pci_get_drvdata(dev);
650 pci_set_power_state(dev, PCI_D0);
652 rc = pci_enable_device(dev);
656 pci_restore_state(dev);
659 if (host->init_chipset)
660 host->init_chipset(dev);
664 EXPORT_SYMBOL_GPL(ide_pci_resume);