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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/mips/pci/pci.c
downloadlinux-2.6.34-ux500-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/mips/pci/pci.c')
-rw-r--r--arch/mips/pci/pci.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
new file mode 100644
index 00000000000..8141dffac24
--- /dev/null
+++ b/arch/mips/pci/pci.c
@@ -0,0 +1,304 @@
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * Copyright (C) 2003, 04 Ralf Baechle (ralf@linux-mips.org)
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+
+/*
+ * Indicate whether we respect the PCI setup left by the firmware.
+ *
+ * Make this long-lived so that we know when shutting down
+ * whether we probed only or not.
+ */
+int pci_probe_only;
+
+#define PCI_ASSIGN_ALL_BUSSES 1
+
+unsigned int pci_probe = PCI_ASSIGN_ALL_BUSSES;
+
+/*
+ * The PCI controller list.
+ */
+
+struct pci_controller *hose_head, **hose_tail = &hose_head;
+struct pci_controller *pci_isa_hose;
+
+unsigned long PCIBIOS_MIN_IO = 0x0000;
+unsigned long PCIBIOS_MIN_MEM = 0;
+
+/*
+ * We need to avoid collisions with `mirrored' VGA ports
+ * and other strange ISA hardware, so we always want the
+ * addresses to be allocated in the 0x000-0x0ff region
+ * modulo 0x400.
+ *
+ * Why? Because some silly external IO cards only decode
+ * the low 10 bits of the IO address. The 0x00-0xff region
+ * is reserved for motherboard devices that decode all 16
+ * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
+ * but we want to try to avoid allocating at 0x2900-0x2bff
+ * which might have be mirrored at 0x0100-0x03ff..
+ */
+void
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
+{
+ struct pci_dev *dev = data;
+ struct pci_controller *hose = dev->sysdata;
+ unsigned long start = res->start;
+
+ if (res->flags & IORESOURCE_IO) {
+ /* Make sure we start at our min on all hoses */
+ if (start < PCIBIOS_MIN_IO + hose->io_resource->start)
+ start = PCIBIOS_MIN_IO + hose->io_resource->start;
+
+ /*
+ * Put everything into 0x00-0xff region modulo 0x400
+ */
+ if (start & 0x300)
+ start = (start + 0x3ff) & ~0x3ff;
+ } else if (res->flags & IORESOURCE_MEM) {
+ /* Make sure we start at our min on all hoses */
+ if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start)
+ start = PCIBIOS_MIN_MEM + hose->mem_resource->start;
+ }
+
+ res->start = start;
+}
+
+struct pci_controller * __init alloc_pci_controller(void)
+{
+ return alloc_bootmem(sizeof(struct pci_controller));
+}
+
+void __init register_pci_controller(struct pci_controller *hose)
+{
+ *hose_tail = hose;
+ hose_tail = &hose->next;
+}
+
+/* Most MIPS systems have straight-forward swizzling needs. */
+
+static inline u8 bridge_swizzle(u8 pin, u8 slot)
+{
+ return (((pin - 1) + slot) % 4) + 1;
+}
+
+static u8 __init common_swizzle(struct pci_dev *dev, u8 *pinp)
+{
+ u8 pin = *pinp;
+
+ while (dev->bus->parent) {
+ pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
+ /* Move up the chain of bridges. */
+ dev = dev->bus->self;
+ }
+ *pinp = pin;
+
+ /* The slot is the slot of the last bridge. */
+ return PCI_SLOT(dev->devfn);
+}
+
+static int __init pcibios_init(void)
+{
+ struct pci_controller *hose;
+ struct pci_bus *bus;
+ int next_busno;
+ int need_domain_info = 0;
+
+ /* Scan all of the recorded PCI controllers. */
+ for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
+
+ if (request_resource(&iomem_resource, hose->mem_resource) < 0)
+ goto out;
+ if (request_resource(&ioport_resource, hose->io_resource) < 0)
+ goto out_free_mem_resource;
+
+ if (!hose->iommu)
+ PCI_DMA_BUS_IS_PHYS = 1;
+
+ bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
+ hose->bus = bus;
+ hose->need_domain_info = need_domain_info;
+ next_busno = bus->subordinate + 1;
+ /* Don't allow 8-bit bus number overflow inside the hose -
+ reserve some space for bridges. */
+ if (next_busno > 224) {
+ next_busno = 0;
+ need_domain_info = 1;
+ }
+ continue;
+
+out_free_mem_resource:
+ release_resource(hose->mem_resource);
+
+out:
+ printk(KERN_WARNING
+ "Skipping PCI bus scan due to resource conflict\n");
+ }
+
+ if (!pci_probe_only)
+ pci_assign_unassigned_resources();
+ pci_fixup_irqs(common_swizzle, pcibios_map_irq);
+
+ return 0;
+}
+
+subsys_initcall(pcibios_init);
+
+static int pcibios_enable_resources(struct pci_dev *dev, int mask)
+{
+ u16 cmd, old_cmd;
+ int idx;
+ struct resource *r;
+
+ pci_read_config_word(dev, PCI_COMMAND, &cmd);
+ old_cmd = cmd;
+ for(idx=0; idx<6; idx++) {
+ /* Only set up the requested stuff */
+ if (!(mask & (1<<idx)))
+ continue;
+
+ r = &dev->resource[idx];
+ if (!r->start && r->end) {
+ printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev));
+ return -EINVAL;
+ }
+ if (r->flags & IORESOURCE_IO)
+ cmd |= PCI_COMMAND_IO;
+ if (r->flags & IORESOURCE_MEM)
+ cmd |= PCI_COMMAND_MEMORY;
+ }
+ if (dev->resource[PCI_ROM_RESOURCE].start)
+ cmd |= PCI_COMMAND_MEMORY;
+ if (cmd != old_cmd) {
+ printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
+ pci_write_config_word(dev, PCI_COMMAND, cmd);
+ }
+ return 0;
+}
+
+/*
+ * If we set up a device for bus mastering, we need to check the latency
+ * timer as certain crappy BIOSes forget to set it properly.
+ */
+unsigned int pcibios_max_latency = 255;
+
+void pcibios_set_master(struct pci_dev *dev)
+{
+ u8 lat;
+ pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
+ if (lat < 16)
+ lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
+ else if (lat > pcibios_max_latency)
+ lat = pcibios_max_latency;
+ else
+ return;
+ printk(KERN_DEBUG "PCI: Setting latency timer of device %s to %d\n",
+ pci_name(dev), lat);
+ pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
+}
+
+unsigned int pcibios_assign_all_busses(void)
+{
+ return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
+}
+
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+ int err;
+
+ if ((err = pcibios_enable_resources(dev, mask)) < 0)
+ return err;
+
+ return pcibios_plat_dev_init(dev);
+}
+
+static void __init pcibios_fixup_device_resources(struct pci_dev *dev,
+ struct pci_bus *bus)
+{
+ /* Update device resources. */
+ struct pci_controller *hose = (struct pci_controller *)bus->sysdata;
+ unsigned long offset = 0;
+ int i;
+
+ for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+ if (!dev->resource[i].start)
+ continue;
+ if (dev->resource[i].flags & IORESOURCE_IO)
+ offset = hose->io_offset;
+ else if (dev->resource[i].flags & IORESOURCE_MEM)
+ offset = hose->mem_offset;
+
+ dev->resource[i].start += offset;
+ dev->resource[i].end += offset;
+ }
+}
+
+void __devinit pcibios_fixup_bus(struct pci_bus *bus)
+{
+ /* Propagate hose info into the subordinate devices. */
+
+ struct pci_controller *hose = bus->sysdata;
+ struct list_head *ln;
+ struct pci_dev *dev = bus->self;
+
+ if (!dev) {
+ bus->resource[0] = hose->io_resource;
+ bus->resource[1] = hose->mem_resource;
+ } else if (pci_probe_only &&
+ (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
+ pci_read_bridge_bases(bus);
+ pcibios_fixup_device_resources(dev, bus);
+ }
+
+ for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
+ struct pci_dev *dev = pci_dev_b(ln);
+
+ if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
+ pcibios_fixup_device_resources(dev, bus);
+ }
+}
+
+void __init
+pcibios_update_irq(struct pci_dev *dev, int irq)
+{
+ pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
+}
+
+void __devinit
+pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
+ struct resource *res)
+{
+ struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
+ unsigned long offset = 0;
+
+ if (res->flags & IORESOURCE_IO)
+ offset = hose->io_offset;
+ else if (res->flags & IORESOURCE_MEM)
+ offset = hose->mem_offset;
+
+ region->start = res->start - offset;
+ region->end = res->end - offset;
+}
+
+#ifdef CONFIG_HOTPLUG
+EXPORT_SYMBOL(pcibios_resource_to_bus);
+EXPORT_SYMBOL(PCIBIOS_MIN_IO);
+EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
+#endif
+
+char *pcibios_setup(char *str)
+{
+ return str;
+}