2 * linux/arch/arm/kernel/bios32.c
4 * PCI bios-type initialisation for PCI machines
6 * Bits taken from various places.
8 #include <linux/config.h>
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/pci.h>
12 #include <linux/slab.h>
13 #include <linux/init.h>
16 #include <asm/mach-types.h>
17 #include <asm/mach/pci.h>
20 static int use_firmware;
23 * We can't use pci_find_device() here since we are
24 * called from interrupt context.
26 static void pcibios_bus_report_status(struct pci_bus *bus, u_int status_mask, int warn)
30 list_for_each_entry(dev, &bus->devices, bus_list) {
34 * ignore host bridge - we handle
37 if (dev->bus->number == 0 && dev->devfn == 0)
40 pci_read_config_word(dev, PCI_STATUS, &status);
44 if ((status & status_mask) == 0)
47 /* clear the status errors */
48 pci_write_config_word(dev, PCI_STATUS, status & status_mask);
51 printk("(%s: %04X) ", pci_name(dev), status);
54 list_for_each_entry(dev, &bus->devices, bus_list)
56 pcibios_bus_report_status(dev->subordinate, status_mask, warn);
59 void pcibios_report_status(u_int status_mask, int warn)
63 list_for_each(l, &pci_root_buses) {
64 struct pci_bus *bus = pci_bus_b(l);
66 pcibios_bus_report_status(bus, status_mask, warn);
71 * We don't use this to fix the device, but initialisation of it.
72 * It's not the correct use for this, but it works.
73 * Note that the arbiter/ISA bridge appears to be buggy, specifically in
76 * 2. ISA bridge ping-pong
77 * 3. ISA bridge master handling of target RETRY
79 * Bug 3 is responsible for the sound DMA grinding to a halt. We now
82 static void __devinit pci_fixup_83c553(struct pci_dev *dev)
85 * Set memory region to start at address 0, and enable IO
87 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, PCI_BASE_ADDRESS_SPACE_MEMORY);
88 pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_IO);
90 dev->resource[0].end -= dev->resource[0].start;
91 dev->resource[0].start = 0;
94 * All memory requests from ISA to be channelled to PCI
96 pci_write_config_byte(dev, 0x48, 0xff);
99 * Enable ping-pong on bus master to ISA bridge transactions.
100 * This improves the sound DMA substantially. The fixed
101 * priority arbiter also helps (see below).
103 pci_write_config_byte(dev, 0x42, 0x01);
108 pci_write_config_byte(dev, 0x40, 0x22);
111 * We used to set the arbiter to "park on last master" (bit
112 * 1 set), but unfortunately the CyberPro does not park the
113 * bus. We must therefore park on CPU. Unfortunately, this
114 * may trigger yet another bug in the 553.
116 pci_write_config_byte(dev, 0x83, 0x02);
119 * Make the ISA DMA request lowest priority, and disable
120 * rotating priorities completely.
122 pci_write_config_byte(dev, 0x80, 0x11);
123 pci_write_config_byte(dev, 0x81, 0x00);
126 * Route INTA input to IRQ 11, and set IRQ11 to be level
129 pci_write_config_word(dev, 0x44, 0xb000);
132 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_83C553, pci_fixup_83c553);
134 static void __devinit pci_fixup_unassign(struct pci_dev *dev)
136 dev->resource[0].end -= dev->resource[0].start;
137 dev->resource[0].start = 0;
139 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND2, PCI_DEVICE_ID_WINBOND2_89C940F, pci_fixup_unassign);
142 * Prevent the PCI layer from seeing the resources allocated to this device
143 * if it is the host bridge by marking it as such. These resources are of
144 * no consequence to the PCI layer (they are handled elsewhere).
146 static void __devinit pci_fixup_dec21285(struct pci_dev *dev)
150 if (dev->devfn == 0) {
152 dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
153 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
154 dev->resource[i].start = 0;
155 dev->resource[i].end = 0;
156 dev->resource[i].flags = 0;
160 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21285, pci_fixup_dec21285);
163 * Same as above. The PrPMC800 carrier board for the PrPMC1100
164 * card maps the host-bridge @ 00:01:00 for some reason and it
165 * ends up getting scanned. Note that we only want to do this
166 * fixup when we find the IXP4xx on a PrPMC system, which is why
167 * we check the machine type. We could be running on a board
168 * with an IXP4xx target device and we don't want to kill the
169 * resources in that case.
171 static void __devinit pci_fixup_prpmc1100(struct pci_dev *dev)
175 if (machine_is_prpmc1100()) {
177 dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
178 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
179 dev->resource[i].start = 0;
180 dev->resource[i].end = 0;
181 dev->resource[i].flags = 0;
185 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IXP4XX, pci_fixup_prpmc1100);
188 * PCI IDE controllers use non-standard I/O port decoding, respect it.
190 static void __devinit pci_fixup_ide_bases(struct pci_dev *dev)
195 if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
198 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
199 r = dev->resource + i;
200 if ((r->start & ~0x80) == 0x374) {
206 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
209 * Put the DEC21142 to sleep
211 static void __devinit pci_fixup_dec21142(struct pci_dev *dev)
213 pci_write_config_dword(dev, 0x40, 0x80000000);
215 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142, pci_fixup_dec21142);
218 * The CY82C693 needs some rather major fixups to ensure that it does
219 * the right thing. Idea from the Alpha people, with a few additions.
221 * We ensure that the IDE base registers are set to 1f0/3f4 for the
222 * primary bus, and 170/374 for the secondary bus. Also, hide them
223 * from the PCI subsystem view as well so we won't try to perform
224 * our own auto-configuration on them.
226 * In addition, we ensure that the PCI IDE interrupts are routed to
227 * IRQ 14 and IRQ 15 respectively.
229 * The above gets us to a point where the IDE on this device is
230 * functional. However, The CY82C693U _does not work_ in bus
231 * master mode without locking the PCI bus solid.
233 static void __devinit pci_fixup_cy82c693(struct pci_dev *dev)
235 if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
238 if (dev->class & 0x80) { /* primary */
241 } else { /* secondary */
246 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
247 base0 | PCI_BASE_ADDRESS_SPACE_IO);
248 pci_write_config_dword(dev, PCI_BASE_ADDRESS_1,
249 base1 | PCI_BASE_ADDRESS_SPACE_IO);
251 dev->resource[0].start = 0;
252 dev->resource[0].end = 0;
253 dev->resource[0].flags = 0;
255 dev->resource[1].start = 0;
256 dev->resource[1].end = 0;
257 dev->resource[1].flags = 0;
258 } else if (PCI_FUNC(dev->devfn) == 0) {
260 * Setup IDE IRQ routing.
262 pci_write_config_byte(dev, 0x4b, 14);
263 pci_write_config_byte(dev, 0x4c, 15);
266 * Disable FREQACK handshake, enable USB.
268 pci_write_config_byte(dev, 0x4d, 0x41);
271 * Enable PCI retry, and PCI post-write buffer.
273 pci_write_config_byte(dev, 0x44, 0x17);
276 * Enable ISA master and DMA post write buffering.
278 pci_write_config_byte(dev, 0x45, 0x03);
281 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, pci_fixup_cy82c693);
283 void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
286 printk("PCI: Assigning IRQ %02d to %s\n", irq, pci_name(dev));
287 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
291 * If the bus contains any of these devices, then we must not turn on
292 * parity checking of any kind. Currently this is CyberPro 20x0 only.
294 static inline int pdev_bad_for_parity(struct pci_dev *dev)
296 return (dev->vendor == PCI_VENDOR_ID_INTERG &&
297 (dev->device == PCI_DEVICE_ID_INTERG_2000 ||
298 dev->device == PCI_DEVICE_ID_INTERG_2010));
302 * Adjust the device resources from bus-centric to Linux-centric.
304 static void __devinit
305 pdev_fixup_device_resources(struct pci_sys_data *root, struct pci_dev *dev)
307 unsigned long offset;
310 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
311 if (dev->resource[i].start == 0)
313 if (dev->resource[i].flags & IORESOURCE_MEM)
314 offset = root->mem_offset;
316 offset = root->io_offset;
318 dev->resource[i].start += offset;
319 dev->resource[i].end += offset;
323 static void __devinit
324 pbus_assign_bus_resources(struct pci_bus *bus, struct pci_sys_data *root)
326 struct pci_dev *dev = bus->self;
331 * Assign root bus resources.
333 for (i = 0; i < 3; i++)
334 bus->resource[i] = root->resource[i];
339 * pcibios_fixup_bus - Called after each bus is probed,
340 * but before its children are examined.
342 void __devinit pcibios_fixup_bus(struct pci_bus *bus)
344 struct pci_sys_data *root = bus->sysdata;
346 u16 features = PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_FAST_BACK;
348 pbus_assign_bus_resources(bus, root);
351 * Walk the devices on this bus, working out what we can
354 list_for_each_entry(dev, &bus->devices, bus_list) {
357 pdev_fixup_device_resources(root, dev);
359 pci_read_config_word(dev, PCI_STATUS, &status);
362 * If any device on this bus does not support fast back
363 * to back transfers, then the bus as a whole is not able
364 * to support them. Having fast back to back transfers
365 * on saves us one PCI cycle per transaction.
367 if (!(status & PCI_STATUS_FAST_BACK))
368 features &= ~PCI_COMMAND_FAST_BACK;
370 if (pdev_bad_for_parity(dev))
371 features &= ~(PCI_COMMAND_SERR | PCI_COMMAND_PARITY);
373 switch (dev->class >> 8) {
374 #if defined(CONFIG_ISA) || defined(CONFIG_EISA)
375 case PCI_CLASS_BRIDGE_ISA:
376 case PCI_CLASS_BRIDGE_EISA:
378 * If this device is an ISA bridge, set isa_bridge
379 * to point at this device. We will then go looking
380 * for things like keyboard, etc.
385 case PCI_CLASS_BRIDGE_PCI:
386 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &status);
387 status |= PCI_BRIDGE_CTL_PARITY|PCI_BRIDGE_CTL_MASTER_ABORT;
388 status &= ~(PCI_BRIDGE_CTL_BUS_RESET|PCI_BRIDGE_CTL_FAST_BACK);
389 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, status);
392 case PCI_CLASS_BRIDGE_CARDBUS:
393 pci_read_config_word(dev, PCI_CB_BRIDGE_CONTROL, &status);
394 status |= PCI_CB_BRIDGE_CTL_PARITY|PCI_CB_BRIDGE_CTL_MASTER_ABORT;
395 pci_write_config_word(dev, PCI_CB_BRIDGE_CONTROL, status);
401 * Now walk the devices again, this time setting them up.
403 list_for_each_entry(dev, &bus->devices, bus_list) {
406 pci_read_config_word(dev, PCI_COMMAND, &cmd);
408 pci_write_config_word(dev, PCI_COMMAND, cmd);
410 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
411 L1_CACHE_BYTES >> 2);
415 * Propagate the flags to the PCI bridge.
417 if (bus->self && bus->self->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
418 if (features & PCI_COMMAND_FAST_BACK)
419 bus->bridge_ctl |= PCI_BRIDGE_CTL_FAST_BACK;
420 if (features & PCI_COMMAND_PARITY)
421 bus->bridge_ctl |= PCI_BRIDGE_CTL_PARITY;
425 * Report what we did for this bus
427 printk(KERN_INFO "PCI: bus%d: Fast back to back transfers %sabled\n",
428 bus->number, (features & PCI_COMMAND_FAST_BACK) ? "en" : "dis");
432 * Convert from Linux-centric to bus-centric addresses for bridge devices.
435 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
436 struct resource *res)
438 struct pci_sys_data *root = dev->sysdata;
439 unsigned long offset = 0;
441 if (res->flags & IORESOURCE_IO)
442 offset = root->io_offset;
443 if (res->flags & IORESOURCE_MEM)
444 offset = root->mem_offset;
446 region->start = res->start - offset;
447 region->end = res->end - offset;
451 pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
452 struct pci_bus_region *region)
454 struct pci_sys_data *root = dev->sysdata;
455 unsigned long offset = 0;
457 if (res->flags & IORESOURCE_IO)
458 offset = root->io_offset;
459 if (res->flags & IORESOURCE_MEM)
460 offset = root->mem_offset;
462 res->start = region->start + offset;
463 res->end = region->end + offset;
466 #ifdef CONFIG_HOTPLUG
467 EXPORT_SYMBOL(pcibios_fixup_bus);
468 EXPORT_SYMBOL(pcibios_resource_to_bus);
469 EXPORT_SYMBOL(pcibios_bus_to_resource);
473 * This is the standard PCI-PCI bridge swizzling algorithm:
480 * ^^^^^^^^^^ irq pin on bridge
482 u8 __devinit pci_std_swizzle(struct pci_dev *dev, u8 *pinp)
486 while (dev->bus->self) {
487 pin = (pin + PCI_SLOT(dev->devfn)) & 3;
489 * move up the chain of bridges,
490 * swizzling as we go.
492 dev = dev->bus->self;
496 return PCI_SLOT(dev->devfn);
500 * Swizzle the device pin each time we cross a bridge.
501 * This might update pin and returns the slot number.
503 static u8 __devinit pcibios_swizzle(struct pci_dev *dev, u8 *pin)
505 struct pci_sys_data *sys = dev->sysdata;
506 int slot = 0, oldpin = *pin;
509 slot = sys->swizzle(dev, pin);
512 printk("PCI: %s swizzling pin %d => pin %d slot %d\n",
513 pci_name(dev), oldpin, *pin, slot);
519 * Map a slot/pin to an IRQ.
521 static int pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
523 struct pci_sys_data *sys = dev->sysdata;
527 irq = sys->map_irq(dev, slot, pin);
530 printk("PCI: %s mapping slot %d pin %d => irq %d\n",
531 pci_name(dev), slot, pin, irq);
536 static void __init pcibios_init_hw(struct hw_pci *hw)
538 struct pci_sys_data *sys = NULL;
542 for (nr = busnr = 0; nr < hw->nr_controllers; nr++) {
543 sys = kzalloc(sizeof(struct pci_sys_data), GFP_KERNEL);
545 panic("PCI: unable to allocate sys data!");
549 sys->swizzle = hw->swizzle;
550 sys->map_irq = hw->map_irq;
551 sys->resource[0] = &ioport_resource;
552 sys->resource[1] = &iomem_resource;
554 ret = hw->setup(nr, sys);
557 sys->bus = hw->scan(nr, sys);
560 panic("PCI: unable to scan bus!");
562 busnr = sys->bus->subordinate + 1;
564 list_add(&sys->node, &hw->buses);
573 void __init pci_common_init(struct hw_pci *hw)
575 struct pci_sys_data *sys;
577 INIT_LIST_HEAD(&hw->buses);
585 pci_fixup_irqs(pcibios_swizzle, pcibios_map_irq);
587 list_for_each_entry(sys, &hw->buses, node) {
588 struct pci_bus *bus = sys->bus;
592 * Size the bridge windows.
594 pci_bus_size_bridges(bus);
599 pci_bus_assign_resources(bus);
603 * Tell drivers about devices found.
605 pci_bus_add_devices(bus);
609 char * __init pcibios_setup(char *str)
611 if (!strcmp(str, "debug")) {
614 } else if (!strcmp(str, "firmware")) {
622 * From arch/i386/kernel/pci-i386.c:
624 * We need to avoid collisions with `mirrored' VGA ports
625 * and other strange ISA hardware, so we always want the
626 * addresses to be allocated in the 0x000-0x0ff region
629 * Why? Because some silly external IO cards only decode
630 * the low 10 bits of the IO address. The 0x00-0xff region
631 * is reserved for motherboard devices that decode all 16
632 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
633 * but we want to try to avoid allocating at 0x2900-0x2bff
634 * which might be mirrored at 0x0100-0x03ff..
636 void pcibios_align_resource(void *data, struct resource *res,
637 unsigned long size, unsigned long align)
639 unsigned long start = res->start;
641 if (res->flags & IORESOURCE_IO && start & 0x300)
642 start = (start + 0x3ff) & ~0x3ff;
644 res->start = (start + align - 1) & ~(align - 1);
648 * pcibios_enable_device - Enable I/O and memory.
649 * @dev: PCI device to be enabled
651 int pcibios_enable_device(struct pci_dev *dev, int mask)
657 pci_read_config_word(dev, PCI_COMMAND, &cmd);
659 for (idx = 0; idx < 6; idx++) {
660 /* Only set up the requested stuff */
661 if (!(mask & (1 << idx)))
664 r = dev->resource + idx;
665 if (!r->start && r->end) {
666 printk(KERN_ERR "PCI: Device %s not available because"
667 " of resource collisions\n", pci_name(dev));
670 if (r->flags & IORESOURCE_IO)
671 cmd |= PCI_COMMAND_IO;
672 if (r->flags & IORESOURCE_MEM)
673 cmd |= PCI_COMMAND_MEMORY;
677 * Bridges (eg, cardbus bridges) need to be fully enabled
679 if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE)
680 cmd |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
682 if (cmd != old_cmd) {
683 printk("PCI: enabling device %s (%04x -> %04x)\n",
684 pci_name(dev), old_cmd, cmd);
685 pci_write_config_word(dev, PCI_COMMAND, cmd);
690 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
691 enum pci_mmap_state mmap_state, int write_combine)
693 struct pci_sys_data *root = dev->sysdata;
696 if (mmap_state == pci_mmap_io) {
699 phys = vma->vm_pgoff + (root->mem_offset >> PAGE_SHIFT);
705 vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
706 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
708 if (remap_pfn_range(vma, vma->vm_start, phys,
709 vma->vm_end - vma->vm_start,