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>
22 * We can't use pci_find_device() here since we are
23 * called from interrupt context.
25 static void pcibios_bus_report_status(struct pci_bus *bus, u_int status_mask, int warn)
29 list_for_each_entry(dev, &bus->devices, bus_list) {
33 * ignore host bridge - we handle
36 if (dev->bus->number == 0 && dev->devfn == 0)
39 pci_read_config_word(dev, PCI_STATUS, &status);
43 if ((status & status_mask) == 0)
46 /* clear the status errors */
47 pci_write_config_word(dev, PCI_STATUS, status & status_mask);
50 printk("(%s: %04X) ", pci_name(dev), status);
53 list_for_each_entry(dev, &bus->devices, bus_list)
55 pcibios_bus_report_status(dev->subordinate, status_mask, warn);
58 void pcibios_report_status(u_int status_mask, int warn)
62 list_for_each(l, &pci_root_buses) {
63 struct pci_bus *bus = pci_bus_b(l);
65 pcibios_bus_report_status(bus, status_mask, warn);
70 * We don't use this to fix the device, but initialisation of it.
71 * It's not the correct use for this, but it works.
72 * Note that the arbiter/ISA bridge appears to be buggy, specifically in
75 * 2. ISA bridge ping-pong
76 * 3. ISA bridge master handling of target RETRY
78 * Bug 3 is responsible for the sound DMA grinding to a halt. We now
81 static void __devinit pci_fixup_83c553(struct pci_dev *dev)
84 * Set memory region to start at address 0, and enable IO
86 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, PCI_BASE_ADDRESS_SPACE_MEMORY);
87 pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_IO);
89 dev->resource[0].end -= dev->resource[0].start;
90 dev->resource[0].start = 0;
93 * All memory requests from ISA to be channelled to PCI
95 pci_write_config_byte(dev, 0x48, 0xff);
98 * Enable ping-pong on bus master to ISA bridge transactions.
99 * This improves the sound DMA substantially. The fixed
100 * priority arbiter also helps (see below).
102 pci_write_config_byte(dev, 0x42, 0x01);
107 pci_write_config_byte(dev, 0x40, 0x22);
110 * We used to set the arbiter to "park on last master" (bit
111 * 1 set), but unfortunately the CyberPro does not park the
112 * bus. We must therefore park on CPU. Unfortunately, this
113 * may trigger yet another bug in the 553.
115 pci_write_config_byte(dev, 0x83, 0x02);
118 * Make the ISA DMA request lowest priority, and disable
119 * rotating priorities completely.
121 pci_write_config_byte(dev, 0x80, 0x11);
122 pci_write_config_byte(dev, 0x81, 0x00);
125 * Route INTA input to IRQ 11, and set IRQ11 to be level
128 pci_write_config_word(dev, 0x44, 0xb000);
132 static void __devinit pci_fixup_unassign(struct pci_dev *dev)
134 dev->resource[0].end -= dev->resource[0].start;
135 dev->resource[0].start = 0;
139 * Prevent the PCI layer from seeing the resources allocated to this device
140 * if it is the host bridge by marking it as such. These resources are of
141 * no consequence to the PCI layer (they are handled elsewhere).
143 static void __devinit pci_fixup_dec21285(struct pci_dev *dev)
147 if (dev->devfn == 0) {
149 dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
150 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
151 dev->resource[i].start = 0;
152 dev->resource[i].end = 0;
153 dev->resource[i].flags = 0;
159 * PCI IDE controllers use non-standard I/O port decoding, respect it.
161 static void __devinit pci_fixup_ide_bases(struct pci_dev *dev)
166 if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
169 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
170 r = dev->resource + i;
171 if ((r->start & ~0x80) == 0x374) {
179 * Put the DEC21142 to sleep
181 static void __devinit pci_fixup_dec21142(struct pci_dev *dev)
183 pci_write_config_dword(dev, 0x40, 0x80000000);
187 * The CY82C693 needs some rather major fixups to ensure that it does
188 * the right thing. Idea from the Alpha people, with a few additions.
190 * We ensure that the IDE base registers are set to 1f0/3f4 for the
191 * primary bus, and 170/374 for the secondary bus. Also, hide them
192 * from the PCI subsystem view as well so we won't try to perform
193 * our own auto-configuration on them.
195 * In addition, we ensure that the PCI IDE interrupts are routed to
196 * IRQ 14 and IRQ 15 respectively.
198 * The above gets us to a point where the IDE on this device is
199 * functional. However, The CY82C693U _does not work_ in bus
200 * master mode without locking the PCI bus solid.
202 static void __devinit pci_fixup_cy82c693(struct pci_dev *dev)
204 if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
207 if (dev->class & 0x80) { /* primary */
210 } else { /* secondary */
215 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
216 base0 | PCI_BASE_ADDRESS_SPACE_IO);
217 pci_write_config_dword(dev, PCI_BASE_ADDRESS_1,
218 base1 | PCI_BASE_ADDRESS_SPACE_IO);
220 dev->resource[0].start = 0;
221 dev->resource[0].end = 0;
222 dev->resource[0].flags = 0;
224 dev->resource[1].start = 0;
225 dev->resource[1].end = 0;
226 dev->resource[1].flags = 0;
227 } else if (PCI_FUNC(dev->devfn) == 0) {
229 * Setup IDE IRQ routing.
231 pci_write_config_byte(dev, 0x4b, 14);
232 pci_write_config_byte(dev, 0x4c, 15);
235 * Disable FREQACK handshake, enable USB.
237 pci_write_config_byte(dev, 0x4d, 0x41);
240 * Enable PCI retry, and PCI post-write buffer.
242 pci_write_config_byte(dev, 0x44, 0x17);
245 * Enable ISA master and DMA post write buffering.
247 pci_write_config_byte(dev, 0x45, 0x03);
251 struct pci_fixup pcibios_fixups[] = {
254 PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693,
258 PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142,
262 PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21285,
266 PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_83C553,
270 PCI_VENDOR_ID_WINBOND2, PCI_DEVICE_ID_WINBOND2_89C940F,
274 PCI_ANY_ID, PCI_ANY_ID,
279 void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
282 printk("PCI: Assigning IRQ %02d to %s\n", irq, pci_name(dev));
283 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
287 * If the bus contains any of these devices, then we must not turn on
288 * parity checking of any kind. Currently this is CyberPro 20x0 only.
290 static inline int pdev_bad_for_parity(struct pci_dev *dev)
292 return (dev->vendor == PCI_VENDOR_ID_INTERG &&
293 (dev->device == PCI_DEVICE_ID_INTERG_2000 ||
294 dev->device == PCI_DEVICE_ID_INTERG_2010));
298 * Adjust the device resources from bus-centric to Linux-centric.
300 static void __devinit
301 pdev_fixup_device_resources(struct pci_sys_data *root, struct pci_dev *dev)
303 unsigned long offset;
306 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
307 if (dev->resource[i].start == 0)
309 if (dev->resource[i].flags & IORESOURCE_MEM)
310 offset = root->mem_offset;
312 offset = root->io_offset;
314 dev->resource[i].start += offset;
315 dev->resource[i].end += offset;
319 static void __devinit
320 pbus_assign_bus_resources(struct pci_bus *bus, struct pci_sys_data *root)
322 struct pci_dev *dev = bus->self;
327 * Assign root bus resources.
329 for (i = 0; i < 3; i++)
330 bus->resource[i] = root->resource[i];
335 * pcibios_fixup_bus - Called after each bus is probed,
336 * but before its children are examined.
338 void __devinit pcibios_fixup_bus(struct pci_bus *bus)
340 struct pci_sys_data *root = bus->sysdata;
342 u16 features = PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_FAST_BACK;
344 pbus_assign_bus_resources(bus, root);
347 * Walk the devices on this bus, working out what we can
350 list_for_each_entry(dev, &bus->devices, bus_list) {
353 pdev_fixup_device_resources(root, dev);
355 pci_read_config_word(dev, PCI_STATUS, &status);
358 * If any device on this bus does not support fast back
359 * to back transfers, then the bus as a whole is not able
360 * to support them. Having fast back to back transfers
361 * on saves us one PCI cycle per transaction.
363 if (!(status & PCI_STATUS_FAST_BACK))
364 features &= ~PCI_COMMAND_FAST_BACK;
366 if (pdev_bad_for_parity(dev))
367 features &= ~(PCI_COMMAND_SERR | PCI_COMMAND_PARITY);
369 switch (dev->class >> 8) {
370 #if defined(CONFIG_ISA) || defined(CONFIG_EISA)
371 case PCI_CLASS_BRIDGE_ISA:
372 case PCI_CLASS_BRIDGE_EISA:
374 * If this device is an ISA bridge, set isa_bridge
375 * to point at this device. We will then go looking
376 * for things like keyboard, etc.
381 case PCI_CLASS_BRIDGE_PCI:
382 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &status);
383 status |= PCI_BRIDGE_CTL_PARITY|PCI_BRIDGE_CTL_MASTER_ABORT;
384 status &= ~(PCI_BRIDGE_CTL_BUS_RESET|PCI_BRIDGE_CTL_FAST_BACK);
385 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, status);
388 case PCI_CLASS_BRIDGE_CARDBUS:
389 pci_read_config_word(dev, PCI_CB_BRIDGE_CONTROL, &status);
390 status |= PCI_CB_BRIDGE_CTL_PARITY|PCI_CB_BRIDGE_CTL_MASTER_ABORT;
391 pci_write_config_word(dev, PCI_CB_BRIDGE_CONTROL, status);
397 * Now walk the devices again, this time setting them up.
399 list_for_each_entry(dev, &bus->devices, bus_list) {
402 pci_read_config_word(dev, PCI_COMMAND, &cmd);
404 pci_write_config_word(dev, PCI_COMMAND, cmd);
406 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
407 L1_CACHE_BYTES >> 2);
411 * Propagate the flags to the PCI bridge.
413 if (bus->self && bus->self->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
414 if (features & PCI_COMMAND_FAST_BACK)
415 bus->bridge_ctl |= PCI_BRIDGE_CTL_FAST_BACK;
416 if (features & PCI_COMMAND_PARITY)
417 bus->bridge_ctl |= PCI_BRIDGE_CTL_PARITY;
421 * Report what we did for this bus
423 printk(KERN_INFO "PCI: bus%d: Fast back to back transfers %sabled\n",
424 bus->number, (features & PCI_COMMAND_FAST_BACK) ? "en" : "dis");
428 * Convert from Linux-centric to bus-centric addresses for bridge devices.
431 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
432 struct resource *res)
434 struct pci_sys_data *root = dev->sysdata;
435 unsigned long offset = 0;
437 if (res->flags & IORESOURCE_IO)
438 offset = root->io_offset;
439 if (res->flags & IORESOURCE_MEM)
440 offset = root->mem_offset;
442 region->start = res->start - offset;
443 region->end = res->end - offset;
446 #ifdef CONFIG_HOTPLUG
447 EXPORT_SYMBOL(pcibios_fixup_bus);
448 EXPORT_SYMBOL(pcibios_resource_to_bus);
452 * This is the standard PCI-PCI bridge swizzling algorithm:
459 * ^^^^^^^^^^ irq pin on bridge
461 u8 __devinit pci_std_swizzle(struct pci_dev *dev, u8 *pinp)
465 while (dev->bus->self) {
466 pin = (pin + PCI_SLOT(dev->devfn)) & 3;
468 * move up the chain of bridges,
469 * swizzling as we go.
471 dev = dev->bus->self;
475 return PCI_SLOT(dev->devfn);
479 * Swizzle the device pin each time we cross a bridge.
480 * This might update pin and returns the slot number.
482 static u8 __devinit pcibios_swizzle(struct pci_dev *dev, u8 *pin)
484 struct pci_sys_data *sys = dev->sysdata;
485 int slot = 0, oldpin = *pin;
488 slot = sys->swizzle(dev, pin);
491 printk("PCI: %s swizzling pin %d => pin %d slot %d\n",
492 pci_name(dev), oldpin, *pin, slot);
498 * Map a slot/pin to an IRQ.
500 static int pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
502 struct pci_sys_data *sys = dev->sysdata;
506 irq = sys->map_irq(dev, slot, pin);
509 printk("PCI: %s mapping slot %d pin %d => irq %d\n",
510 pci_name(dev), slot, pin, irq);
515 static void __init pcibios_init_hw(struct hw_pci *hw)
517 struct pci_sys_data *sys = NULL;
521 for (nr = busnr = 0; nr < hw->nr_controllers; nr++) {
522 sys = kmalloc(sizeof(struct pci_sys_data), GFP_KERNEL);
524 panic("PCI: unable to allocate sys data!");
526 memset(sys, 0, sizeof(struct pci_sys_data));
530 sys->swizzle = hw->swizzle;
531 sys->map_irq = hw->map_irq;
532 sys->resource[0] = &ioport_resource;
533 sys->resource[1] = &iomem_resource;
535 ret = hw->setup(nr, sys);
538 sys->bus = hw->scan(nr, sys);
541 panic("PCI: unable to scan bus!");
543 busnr = sys->bus->subordinate + 1;
545 list_add(&sys->node, &hw->buses);
554 void __init pci_common_init(struct hw_pci *hw)
556 struct pci_sys_data *sys;
558 INIT_LIST_HEAD(&hw->buses);
566 pci_fixup_irqs(pcibios_swizzle, pcibios_map_irq);
568 list_for_each_entry(sys, &hw->buses, node) {
569 struct pci_bus *bus = sys->bus;
572 * Size the bridge windows.
574 pci_bus_size_bridges(bus);
579 pci_bus_assign_resources(bus);
582 * Tell drivers about devices found.
584 pci_bus_add_devices(bus);
588 char * __init pcibios_setup(char *str)
590 if (!strcmp(str, "debug")) {
598 * From arch/i386/kernel/pci-i386.c:
600 * We need to avoid collisions with `mirrored' VGA ports
601 * and other strange ISA hardware, so we always want the
602 * addresses to be allocated in the 0x000-0x0ff region
605 * Why? Because some silly external IO cards only decode
606 * the low 10 bits of the IO address. The 0x00-0xff region
607 * is reserved for motherboard devices that decode all 16
608 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
609 * but we want to try to avoid allocating at 0x2900-0x2bff
610 * which might be mirrored at 0x0100-0x03ff..
612 void pcibios_align_resource(void *data, struct resource *res,
613 unsigned long size, unsigned long align)
615 unsigned long start = res->start;
617 if (res->flags & IORESOURCE_IO && start & 0x300)
618 start = (start + 0x3ff) & ~0x3ff;
620 res->start = (start + align - 1) & ~(align - 1);
624 * pcibios_enable_device - Enable I/O and memory.
625 * @dev: PCI device to be enabled
627 int pcibios_enable_device(struct pci_dev *dev, int mask)
633 pci_read_config_word(dev, PCI_COMMAND, &cmd);
635 for (idx = 0; idx < 6; idx++) {
636 /* Only set up the requested stuff */
637 if (!(mask & (1 << idx)))
640 r = dev->resource + idx;
641 if (!r->start && r->end) {
642 printk(KERN_ERR "PCI: Device %s not available because"
643 " of resource collisions\n", pci_name(dev));
646 if (r->flags & IORESOURCE_IO)
647 cmd |= PCI_COMMAND_IO;
648 if (r->flags & IORESOURCE_MEM)
649 cmd |= PCI_COMMAND_MEMORY;
653 * Bridges (eg, cardbus bridges) need to be fully enabled
655 if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE)
656 cmd |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
658 if (cmd != old_cmd) {
659 printk("PCI: enabling device %s (%04x -> %04x)\n",
660 pci_name(dev), old_cmd, cmd);
661 pci_write_config_word(dev, PCI_COMMAND, cmd);
666 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
667 enum pci_mmap_state mmap_state, int write_combine)
669 struct pci_sys_data *root = dev->sysdata;
672 if (mmap_state == pci_mmap_io) {
675 phys = root->mem_offset + (vma->vm_pgoff << PAGE_SHIFT);
681 vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
682 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
684 if (remap_page_range(vma, vma->vm_start, phys,
685 vma->vm_end - vma->vm_start,