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 - find free ide_hwifs[] slot
26 * @bootable: bootable flag
28 * Return the new hwif. If we are out of free slots return NULL.
31 static ide_hwif_t *ide_match_hwif(u8 bootable)
37 * Claim an unassigned slot.
39 * Give preference to claiming other slots before claiming ide0/ide1,
40 * just in case there's another interface yet-to-be-scanned
41 * which uses ports 1f0/170 (the ide0/ide1 defaults).
43 * Unless there is a bootable card that does not use the standard
44 * ports 1f0/170 (the ide0/ide1 defaults). The (bootable) flag.
47 for (h = 0; h < MAX_HWIFS; ++h) {
49 if (hwif->chipset == ide_unknown)
50 return hwif; /* pick an unused entry */
53 for (h = 2; h < MAX_HWIFS; ++h) {
55 if (hwif->chipset == ide_unknown)
56 return hwif; /* pick an unused entry */
59 for (h = 0; h < 2 && h < MAX_HWIFS; ++h) {
61 if (hwif->chipset == ide_unknown)
62 return hwif; /* pick an unused entry */
69 * ide_setup_pci_baseregs - place a PCI IDE controller native
70 * @dev: PCI device of interface to switch native
71 * @name: Name of interface
73 * We attempt to place the PCI interface into PCI native mode. If
74 * we succeed the BARs are ok and the controller is in PCI mode.
75 * Returns 0 on success or an errno code.
77 * FIXME: if we program the interface and then fail to set the BARS
78 * we don't switch it back to legacy mode. Do we actually care ??
81 static int ide_setup_pci_baseregs (struct pci_dev *dev, const char *name)
86 * Place both IDE interfaces into PCI "native" mode:
88 if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
90 if ((progif & 0xa) != 0xa) {
91 printk(KERN_INFO "%s: device not capable of full "
92 "native PCI mode\n", name);
95 printk("%s: placing both ports into native PCI mode\n", name);
96 (void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5);
97 if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
99 printk(KERN_ERR "%s: rewrite of PROGIF failed, wanted "
100 "0x%04x, got 0x%04x\n",
101 name, progif|5, progif);
108 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
109 static void ide_pci_clear_simplex(unsigned long dma_base, const char *name)
111 u8 dma_stat = inb(dma_base + 2);
113 outb(dma_stat & 0x60, dma_base + 2);
114 dma_stat = inb(dma_base + 2);
116 printk(KERN_INFO "%s: simplex device: DMA forced\n", name);
120 * ide_get_or_set_dma_base - setup BMIBA
122 * @hwif: IDE interface
124 * Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space.
125 * Where a device has a partner that is already in DMA mode we check
126 * and enforce IDE simplex rules.
129 static unsigned long ide_get_or_set_dma_base(const struct ide_port_info *d, ide_hwif_t *hwif)
131 struct pci_dev *dev = to_pci_dev(hwif->dev);
132 unsigned long dma_base = 0;
136 return hwif->dma_base;
138 if (hwif->mate && hwif->mate->dma_base) {
139 dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8);
141 u8 baridx = (d->host_flags & IDE_HFLAG_CS5520) ? 2 : 4;
143 dma_base = pci_resource_start(dev, baridx);
146 printk(KERN_ERR "%s: DMA base is invalid\n", d->name);
154 if (d->host_flags & IDE_HFLAG_CS5520)
157 if (d->host_flags & IDE_HFLAG_CLEAR_SIMPLEX) {
158 ide_pci_clear_simplex(dma_base, d->name);
163 * If the device claims "simplex" DMA, this means that only one of
164 * the two interfaces can be trusted with DMA at any point in time
165 * (so we should enable DMA only on one of the two interfaces).
167 * FIXME: At this point we haven't probed the drives so we can't make
168 * the appropriate decision. Really we should defer this problem until
169 * we tune the drive then try to grab DMA ownership if we want to be
170 * the DMA end. This has to be become dynamic to handle hot-plug.
172 dma_stat = hwif->INB(dma_base + 2);
173 if ((dma_stat & 0x80) && hwif->mate && hwif->mate->dma_base) {
174 printk(KERN_INFO "%s: simplex device: DMA disabled\n", d->name);
180 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
182 void ide_setup_pci_noise(struct pci_dev *dev, const struct ide_port_info *d)
184 printk(KERN_INFO "%s: IDE controller (0x%04x:0x%04x rev 0x%02x) at "
185 " PCI slot %s\n", d->name, dev->vendor, dev->device,
186 dev->revision, pci_name(dev));
189 EXPORT_SYMBOL_GPL(ide_setup_pci_noise);
193 * ide_pci_enable - do PCI enables
197 * Enable the IDE PCI device. We attempt to enable the device in full
198 * but if that fails then we only need IO space. The PCI code should
199 * have setup the proper resources for us already for controllers in
202 * Returns zero on success or an error code
205 static int ide_pci_enable(struct pci_dev *dev, const struct ide_port_info *d)
209 if (pci_enable_device(dev)) {
210 ret = pci_enable_device_io(dev);
212 printk(KERN_WARNING "%s: (ide_setup_pci_device:) "
213 "Could not enable device.\n", d->name);
216 printk(KERN_WARNING "%s: BIOS configuration fixed.\n", d->name);
220 * assume all devices can do 32-bit DMA for now, we can add
221 * a DMA mask field to the struct ide_port_info if we need it
222 * (or let lower level driver set the DMA mask)
224 ret = pci_set_dma_mask(dev, DMA_32BIT_MASK);
226 printk(KERN_ERR "%s: can't set dma mask\n", d->name);
230 /* FIXME: Temporary - until we put in the hotplug interface logic
231 Check that the bits we want are not in use by someone else. */
232 ret = pci_request_region(dev, 4, "ide_tmp");
236 pci_release_region(dev, 4);
242 * ide_pci_configure - configure an unconfigured device
246 * Enable and configure the PCI device we have been passed.
247 * Returns zero on success or an error code.
250 static int ide_pci_configure(struct pci_dev *dev, const struct ide_port_info *d)
254 * PnP BIOS was *supposed* to have setup this device, but we
255 * can do it ourselves, so long as the BIOS has assigned an IRQ
256 * (or possibly the device is using a "legacy header" for IRQs).
257 * Maybe the user deliberately *disabled* the device,
258 * but we'll eventually ignore it again if no drives respond.
260 if (ide_setup_pci_baseregs(dev, d->name) || pci_write_config_word(dev, PCI_COMMAND, pcicmd|PCI_COMMAND_IO))
262 printk(KERN_INFO "%s: device disabled (BIOS)\n", d->name);
265 if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
266 printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
269 if (!(pcicmd & PCI_COMMAND_IO)) {
270 printk(KERN_ERR "%s: unable to enable IDE controller\n", d->name);
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_hwif_configure - configure an IDE interface
305 * @dev: PCI device holding interface
310 * Perform the initial set up for the hardware interface structure. This
311 * is done per interface port rather than per PCI device. There may be
312 * more than one port per device.
314 * Returns the new hardware interface structure, or NULL on a failure
317 static ide_hwif_t *ide_hwif_configure(struct pci_dev *dev,
318 const struct ide_port_info *d,
319 unsigned int port, int irq)
321 unsigned long ctl = 0, base = 0;
323 u8 bootable = (d->host_flags & IDE_HFLAG_BOOTABLE) ? 1 : 0;
326 if ((d->host_flags & IDE_HFLAG_ISA_PORTS) == 0) {
327 if (ide_pci_check_iomem(dev, d, 2 * port) ||
328 ide_pci_check_iomem(dev, d, 2 * port + 1)) {
329 printk(KERN_ERR "%s: I/O baseregs (BIOS) are reported "
330 "as MEM for port %d!\n", d->name, port);
334 ctl = pci_resource_start(dev, 2*port+1);
335 base = pci_resource_start(dev, 2*port);
336 if ((ctl && !base) || (base && !ctl)) {
337 printk(KERN_ERR "%s: inconsistent baseregs (BIOS) "
338 "for port %d, skipping\n", d->name, port);
344 /* Use default values */
345 ctl = port ? 0x374 : 0x3f4;
346 base = port ? 0x170 : 0x1f0;
349 hwif = ide_match_hwif(bootable);
351 printk(KERN_ERR "%s: too many IDE interfaces, no room in "
356 memset(&hw, 0, sizeof(hw));
359 hw.chipset = d->chipset ? d->chipset : ide_pci;
360 ide_std_init_ports(&hw, base, ctl | 2);
362 ide_init_port_hw(hwif, &hw);
364 hwif->dev = &dev->dev;
370 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
372 * ide_hwif_setup_dma - configure DMA interface
373 * @hwif: IDE interface
376 * Set up the DMA base for the interface. Enable the master bits as
377 * necessary and attempt to bring the device DMA into a ready to use
381 void ide_hwif_setup_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
383 struct pci_dev *dev = to_pci_dev(hwif->dev);
386 pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
388 if ((d->host_flags & IDE_HFLAG_NO_AUTODMA) == 0 ||
389 ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
390 (dev->class & 0x80))) {
391 unsigned long dma_base = ide_get_or_set_dma_base(d, hwif);
392 if (dma_base && !(pcicmd & PCI_COMMAND_MASTER)) {
394 * Set up BM-DMA capability
395 * (PnP BIOS should have done this)
398 if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) || !(pcicmd & PCI_COMMAND_MASTER)) {
399 printk(KERN_ERR "%s: %s error updating PCICMD\n",
400 hwif->name, d->name);
406 d->init_dma(hwif, dma_base);
408 ide_setup_dma(hwif, dma_base);
411 printk(KERN_INFO "%s: %s Bus-Master DMA disabled "
412 "(BIOS)\n", hwif->name, d->name);
416 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
419 * ide_setup_pci_controller - set up IDE PCI
422 * @noisy: verbose flag
423 * @config: returned as 1 if we configured the hardware
425 * Set up the PCI and controller side of the IDE interface. This brings
426 * up the PCI side of the device, checks that the device is enabled
427 * and enables it if need be
430 static int ide_setup_pci_controller(struct pci_dev *dev, const struct ide_port_info *d, int noisy, int *config)
436 ide_setup_pci_noise(dev, d);
438 ret = ide_pci_enable(dev, d);
442 ret = pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
444 printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
447 if (!(pcicmd & PCI_COMMAND_IO)) { /* is device disabled? */
448 ret = ide_pci_configure(dev, d);
452 printk(KERN_INFO "%s: device enabled (Linux)\n", d->name);
460 * ide_pci_setup_ports - configure ports/devices on PCI IDE
464 * @idx: ATA index table to update
466 * Scan the interfaces attached to this device and do any
467 * necessary per port setup. Attach the devices and ask the
468 * generic DMA layer to do its work for us.
470 * Normally called automaticall from do_ide_pci_setup_device,
471 * but is also used directly as a helper function by some controllers
472 * where the chipset setup is not the default PCI IDE one.
475 void ide_pci_setup_ports(struct pci_dev *dev, const struct ide_port_info *d, int pciirq, u8 *idx)
477 int channels = (d->host_flags & IDE_HFLAG_SINGLE) ? 1 : 2, port;
482 * Set up the IDE ports
485 for (port = 0; port < channels; ++port) {
486 const ide_pci_enablebit_t *e = &(d->enablebits[port]);
488 if (e->reg && (pci_read_config_byte(dev, e->reg, &tmp) ||
489 (tmp & e->mask) != e->val)) {
490 printk(KERN_INFO "%s: IDE port disabled\n", d->name);
491 continue; /* port not enabled */
494 hwif = ide_hwif_configure(dev, d, port, pciirq);
498 *(idx + port) = hwif->index;
502 EXPORT_SYMBOL_GPL(ide_pci_setup_ports);
505 * ide_setup_pci_device() looks at the primary/secondary interfaces
506 * on a PCI IDE device and, if they are enabled, prepares the IDE driver
507 * for use with them. This generic code works for most PCI chipsets.
509 * One thing that is not standardized is the location of the
510 * primary/secondary interface "enable/disable" bits. For chipsets that
511 * we "know" about, this information is in the struct ide_port_info;
512 * for all other chipsets, we just assume both interfaces are enabled.
514 static int do_ide_setup_pci_device(struct pci_dev *dev,
515 const struct ide_port_info *d,
518 int tried_config = 0;
521 ret = ide_setup_pci_controller(dev, d, noisy, &tried_config);
526 * Can we trust the reported IRQ?
530 /* Is it an "IDE storage" device in non-PCI mode? */
531 if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE && (dev->class & 5) != 5) {
533 printk(KERN_INFO "%s: not 100%% native mode: "
534 "will probe irqs later\n", d->name);
536 * This allows offboard ide-pci cards the enable a BIOS,
537 * verify interrupt settings of split-mirror pci-config
538 * space, place chipset into init-mode, and/or preserve
539 * an interrupt if the card is not native ide support.
541 ret = d->init_chipset ? d->init_chipset(dev, d->name) : 0;
545 } else if (tried_config) {
547 printk(KERN_INFO "%s: will probe irqs later\n", d->name);
549 } else if (!pciirq) {
551 printk(KERN_WARNING "%s: bad irq (%d): will probe later\n",
555 if (d->init_chipset) {
556 ret = d->init_chipset(dev, d->name);
561 printk(KERN_INFO "%s: 100%% native mode on irq %d\n",
565 /* FIXME: silent failure can happen */
567 ide_pci_setup_ports(dev, d, pciirq, idx);
572 int ide_setup_pci_device(struct pci_dev *dev, const struct ide_port_info *d)
574 u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
577 ret = do_ide_setup_pci_device(dev, d, &idx[0], 1);
580 ide_device_add(idx, d);
585 EXPORT_SYMBOL_GPL(ide_setup_pci_device);
587 int ide_setup_pci_devices(struct pci_dev *dev1, struct pci_dev *dev2,
588 const struct ide_port_info *d)
590 struct pci_dev *pdev[] = { dev1, dev2 };
592 u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
594 for (i = 0; i < 2; i++) {
595 ret = do_ide_setup_pci_device(pdev[i], d, &idx[i*2], !i);
597 * FIXME: Mom, mom, they stole me the helper function to undo
598 * do_ide_setup_pci_device() on the first device!
604 ide_device_add(idx, d);
609 EXPORT_SYMBOL_GPL(ide_setup_pci_devices);