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, d->name) : 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);