pci.c
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上传日期:2013-04-10
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- /*
- * linux/arch/alpha/kernel/pci.c
- *
- * Extruded from code written by
- * Dave Rusling (david.rusling@reo.mts.dec.com)
- * David Mosberger (davidm@cs.arizona.edu)
- */
- /* 2.3.x PCI/resources, 1999 Andrea Arcangeli <andrea@suse.de> */
- /*
- * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
- * PCI-PCI bridges cleanup
- */
- #include <linux/string.h>
- #include <linux/pci.h>
- #include <linux/init.h>
- #include <linux/ioport.h>
- #include <linux/kernel.h>
- #include <linux/bootmem.h>
- #include <asm/machvec.h>
- #include "proto.h"
- #include "pci_impl.h"
- /*
- * Some string constants used by the various core logics.
- */
- const char *const pci_io_names[] = {
- "PCI IO bus 0", "PCI IO bus 1", "PCI IO bus 2", "PCI IO bus 3",
- "PCI IO bus 4", "PCI IO bus 5", "PCI IO bus 6", "PCI IO bus 7"
- };
- const char *const pci_mem_names[] = {
- "PCI mem bus 0", "PCI mem bus 1", "PCI mem bus 2", "PCI mem bus 3",
- "PCI mem bus 4", "PCI mem bus 5", "PCI mem bus 6", "PCI mem bus 7"
- };
- const char pci_hae0_name[] = "HAE0";
- /*
- * The PCI controller list.
- */
- struct pci_controller *hose_head, **hose_tail = &hose_head;
- struct pci_controller *pci_isa_hose;
- /*
- * Quirks.
- */
- static void __init
- quirk_eisa_bridge(struct pci_dev *dev)
- {
- dev->class = PCI_CLASS_BRIDGE_EISA << 8;
- }
- static void __init
- quirk_isa_bridge(struct pci_dev *dev)
- {
- dev->class = PCI_CLASS_BRIDGE_ISA << 8;
- }
- static void __init
- quirk_ali_ide_ports(struct pci_dev *dev)
- {
- if (dev->resource[0].end == 0xffff)
- dev->resource[0].end = dev->resource[0].start + 7;
- if (dev->resource[2].end == 0xffff)
- dev->resource[2].end = dev->resource[2].start + 7;
- if (dev->resource[3].end == 0xffff)
- dev->resource[3].end = dev->resource[3].start + 7;
- }
- static void __init
- quirk_cypress(struct pci_dev *dev)
- {
- /* The Notorious Cy82C693 chip. */
- /* The Cypress IDE controller doesn't support native mode, but it
- has programmable addresses of IDE command/control registers.
- This violates PCI specifications, confuses the IDE subsystem and
- causes resource conflicts between the primary HD_CMD register and
- the floppy controller. Ugh. Fix that. */
- if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE) {
- dev->resource[0].flags = 0;
- dev->resource[1].flags = 0;
- }
- /* The Cypress bridge responds on the PCI bus in the address range
- 0xffff0000-0xffffffff (conventional x86 BIOS ROM). There is no
- way to turn this off. The bridge also supports several extended
- BIOS ranges (disabled after power-up), and some consoles do turn
- them on. So if we use a large direct-map window, or a large SG
- window, we must avoid entire 0xfff00000-0xffffffff region. */
- else if (dev->class >> 8 == PCI_CLASS_BRIDGE_ISA) {
- if (__direct_map_base + __direct_map_size >= 0xfff00000)
- __direct_map_size = 0xfff00000 - __direct_map_base;
- else {
- struct pci_controller *hose = dev->sysdata;
- struct pci_iommu_arena *pci = hose->sg_pci;
- if (pci && pci->dma_base + pci->size >= 0xfff00000)
- pci->size = 0xfff00000 - pci->dma_base;
- }
- }
- }
- struct pci_fixup pcibios_fixups[] __initdata = {
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82375,
- quirk_eisa_bridge },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82378,
- quirk_isa_bridge },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M5229,
- quirk_ali_ide_ports },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693,
- quirk_cypress },
- { 0 }
- };
- #define MAX(val1, val2) ((val1) > (val2) ? (val1) : (val2))
- #define ALIGN(val,align) (((val) + ((align) - 1)) & ~((align) - 1))
- #define KB 1024
- #define MB (1024*KB)
- #define GB (1024*MB)
- 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 alignto;
- unsigned long start = res->start;
- if (res->flags & IORESOURCE_IO) {
- /* Make sure we start at our min on all hoses */
- if (start - hose->io_space->start < PCIBIOS_MIN_IO)
- start = PCIBIOS_MIN_IO + hose->io_space->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 - hose->mem_space->start < PCIBIOS_MIN_MEM)
- start = PCIBIOS_MIN_MEM + hose->mem_space->start;
- /*
- * The following holds at least for the Low Cost
- * Alpha implementation of the PCI interface:
- *
- * In sparse memory address space, the first
- * octant (16MB) of every 128MB segment is
- * aliased to the very first 16 MB of the
- * address space (i.e., it aliases the ISA
- * memory address space). Thus, we try to
- * avoid allocating PCI devices in that range.
- * Can be allocated in 2nd-7th octant only.
- * Devices that need more than 112MB of
- * address space must be accessed through
- * dense memory space only!
- */
- /* Align to multiple of size of minimum base. */
- alignto = MAX(0x1000, align);
- start = ALIGN(start, alignto);
- if (hose->sparse_mem_base && size <= 7 * 16*MB) {
- if (((start / (16*MB)) & 0x7) == 0) {
- start &= ~(128*MB - 1);
- start += 16*MB;
- start = ALIGN(start, alignto);
- }
- if (start/(128*MB) != (start + size - 1)/(128*MB)) {
- start &= ~(128*MB - 1);
- start += (128 + 16)*MB;
- start = ALIGN(start, alignto);
- }
- }
- }
- res->start = start;
- }
- #undef MAX
- #undef ALIGN
- #undef KB
- #undef MB
- #undef GB
- void __init
- pcibios_init(void)
- {
- if (!alpha_mv.init_pci)
- return;
- alpha_mv.init_pci();
- }
- char * __init
- pcibios_setup(char *str)
- {
- return str;
- }
- void __init
- pcibios_fixup_resource(struct resource *res, struct resource *root)
- {
- res->start += root->start;
- res->end += root->start;
- }
- 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;
- int i;
- for (i = 0; i < PCI_NUM_RESOURCES; i++) {
- if (!dev->resource[i].start)
- continue;
- if (dev->resource[i].flags & IORESOURCE_IO)
- pcibios_fixup_resource(&dev->resource[i],
- hose->io_space);
- else if (dev->resource[i].flags & IORESOURCE_MEM)
- pcibios_fixup_resource(&dev->resource[i],
- hose->mem_space);
- }
- }
- void __init
- pcibios_fixup_bus(struct pci_bus *bus)
- {
- /* Propogate hose info into the subordinate devices. */
- struct pci_controller *hose = bus->sysdata;
- struct list_head *ln;
- struct pci_dev *dev = bus->self;
- if (!dev) {
- /* Root bus */
- bus->resource[0] = hose->io_space;
- bus->resource[1] = hose->mem_space;
- }
- 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
- pcibios_update_resource(struct pci_dev *dev, struct resource *root,
- struct resource *res, int resource)
- {
- struct pci_controller *hose = dev->sysdata;
- int where;
- u32 reg;
- if (resource < PCI_ROM_RESOURCE)
- where = PCI_BASE_ADDRESS_0 + (resource * 4);
- else if (resource == PCI_ROM_RESOURCE)
- where = dev->rom_base_reg;
- else {
- return; /* Don't update non-standard resources here. */
- }
- /* Point root at the hose root. */
- if (res->flags & IORESOURCE_IO)
- root = hose->io_space;
- if (res->flags & IORESOURCE_MEM)
- root = hose->mem_space;
- reg = (res->start - root->start) | (res->flags & 0xf);
- pci_write_config_dword(dev, where, reg);
- if ((res->flags & (PCI_BASE_ADDRESS_SPACE
- | PCI_BASE_ADDRESS_MEM_TYPE_MASK))
- == (PCI_BASE_ADDRESS_SPACE_MEMORY
- | PCI_BASE_ADDRESS_MEM_TYPE_64)) {
- pci_write_config_dword(dev, where+4, 0);
- printk(KERN_WARNING "PCI: dev %s type 64-bitn", dev->name);
- }
- /* ??? FIXME -- record old value for shutdown. */
- }
- void __init
- pcibios_update_irq(struct pci_dev *dev, int irq)
- {
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
- /* ??? FIXME -- record old value for shutdown. */
- }
- /* Most Alphas have straight-forward swizzling needs. */
- u8 __init
- common_swizzle(struct pci_dev *dev, u8 *pinp)
- {
- struct pci_controller *hose = dev->sysdata;
- if (dev->bus->number != hose->first_busno) {
- u8 pin = *pinp;
- do {
- pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
- /* Move up the chain of bridges. */
- dev = dev->bus->self;
- } while (dev->bus->self);
- *pinp = pin;
- /* The slot is the slot of the last bridge. */
- }
- return PCI_SLOT(dev->devfn);
- }
- void __init
- pcibios_fixup_pbus_ranges(struct pci_bus * bus,
- struct pbus_set_ranges_data * ranges)
- {
- struct pci_controller *hose = (struct pci_controller *)bus->sysdata;
- ranges->io_start -= hose->io_space->start;
- ranges->io_end -= hose->io_space->start;
- ranges->mem_start -= hose->mem_space->start;
- ranges->mem_end -= hose->mem_space->start;
- /* FIXME: On older alphas we could use dense memory space
- to access prefetchable resources. */
- ranges->prefetch_start -= hose->mem_space->start;
- ranges->prefetch_end -= hose->mem_space->start;
- }
- int
- pcibios_enable_device(struct pci_dev *dev, int mask)
- {
- /* Nothing to do, since we enable all devices at startup. */
- return 0;
- }
- /*
- * If we set up a device for bus mastering, we need to check the latency
- * timer as certain firmware forgets to set it properly, as seen
- * on SX164 and LX164 with SRM.
- */
- void
- pcibios_set_master(struct pci_dev *dev)
- {
- u8 lat;
- pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
- if (lat >= 16) return;
- printk("PCI: Setting latency timer of device %s to 64n",
- dev->slot_name);
- pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
- }
- void __init
- common_init_pci(void)
- {
- struct pci_controller *hose;
- struct pci_bus *bus;
- int next_busno;
- /* Scan all of the recorded PCI controllers. */
- for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
- hose->first_busno = next_busno;
- hose->last_busno = 0xff;
- bus = pci_scan_bus(next_busno, alpha_mv.pci_ops, hose);
- hose->bus = bus;
- next_busno = hose->last_busno = bus->subordinate;
- next_busno += 1;
- }
- pci_assign_unassigned_resources();
- pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
- }
- struct pci_controller * __init
- alloc_pci_controller(void)
- {
- struct pci_controller *hose;
- hose = alloc_bootmem(sizeof(*hose));
- *hose_tail = hose;
- hose_tail = &hose->next;
- return hose;
- }
- struct resource * __init
- alloc_resource(void)
- {
- struct resource *res;
- res = alloc_bootmem(sizeof(*res));
- return res;
- }
- /* Provide information on locations of various I/O regions in physical
- memory. Do this on a per-card basis so that we choose the right hose. */
- asmlinkage long
- sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
- {
- struct pci_controller *hose;
- struct pci_dev *dev;
- /* from hose or from bus.devfn */
- if (which & IOBASE_FROM_HOSE) {
- for(hose = hose_head; hose; hose = hose->next)
- if (hose->index == bus) break;
- if (!hose) return -ENODEV;
- } else {
- /* Special hook for ISA access. */
- if (bus == 0 && dfn == 0) {
- hose = pci_isa_hose;
- } else {
- dev = pci_find_slot(bus, dfn);
- if (!dev)
- return -ENODEV;
- hose = dev->sysdata;
- }
- }
- switch (which & ~IOBASE_FROM_HOSE) {
- case IOBASE_HOSE:
- return hose->index;
- case IOBASE_SPARSE_MEM:
- return hose->sparse_mem_base;
- case IOBASE_DENSE_MEM:
- return hose->dense_mem_base;
- case IOBASE_SPARSE_IO:
- return hose->sparse_io_base;
- case IOBASE_DENSE_IO:
- return hose->dense_io_base;
- case IOBASE_ROOT_BUS:
- return hose->bus->number;
- }
- return -EOPNOTSUPP;
- }
- /* Return the index of the PCI controller for device PDEV. */
- int
- pci_controller_num(struct pci_dev *pdev)
- {
- struct pci_controller *hose = pdev->sysdata;
- return (hose ? hose->index : -ENXIO);
- }