pci.c
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上传日期:2013-02-24
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文件大小:33k
- /*
- * BK Id: SCCS/s.pci.c 1.40 01/25/02 15:15:24 benh
- */
- /*
- * Common pmac/prep/chrp pci routines. -- Cort
- */
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/pci.h>
- #include <linux/delay.h>
- #include <linux/string.h>
- #include <linux/init.h>
- #include <linux/capability.h>
- #include <linux/sched.h>
- #include <linux/errno.h>
- #include <linux/bootmem.h>
- #include <asm/processor.h>
- #include <asm/io.h>
- #include <asm/prom.h>
- #include <asm/sections.h>
- #include <asm/pci-bridge.h>
- #include <asm/residual.h>
- #include <asm/byteorder.h>
- #include <asm/irq.h>
- #include <asm/gg2.h>
- #include <asm/uaccess.h>
- #include "pci.h"
- #define DEBUG
- #ifdef DEBUG
- #define DBG(x...) printk(x)
- #else
- #define DBG(x...)
- #endif
- unsigned long isa_io_base = 0;
- unsigned long isa_mem_base = 0;
- unsigned long pci_dram_offset = 0;
- void pcibios_make_OF_bus_map(void);
- static void pcibios_fixup_resources(struct pci_dev* dev);
- static void fixup_broken_pcnet32(struct pci_dev* dev);
- static void fixup_rev1_53c810(struct pci_dev* dev);
- #ifdef CONFIG_ALL_PPC
- static void pcibios_fixup_cardbus(struct pci_dev* dev);
- static u8* pci_to_OF_bus_map;
- #endif
- /* By default, we don't re-assign bus numbers. We do this only on
- * some pmacs
- */
- int pci_assign_all_busses;
- struct pci_controller* hose_head;
- struct pci_controller** hose_tail = &hose_head;
- static int pci_bus_count;
- struct pci_fixup pcibios_fixups[] = {
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID, fixup_broken_pcnet32 },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C810, fixup_rev1_53c810 },
- { PCI_FIXUP_HEADER, PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources },
- #ifdef CONFIG_ALL_PPC
- /* We should add per-machine fixup support in xxx_setup.c or xxx_pci.c */
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_TI, PCI_ANY_ID, pcibios_fixup_cardbus },
- #endif /* CONFIG_ALL_PPC */
- { 0 }
- };
- static void
- fixup_rev1_53c810(struct pci_dev* dev)
- {
- /* rev 1 ncr53c810 chips don't set the class at all which means
- * they don't get their resources remapped. Fix that here.
- */
- if ((dev->class == PCI_CLASS_NOT_DEFINED)) {
- printk("NCR 53c810 rev 1 detected, setting PCI class.n");
- dev->class = PCI_CLASS_STORAGE_SCSI;
- }
- }
- static void
- fixup_broken_pcnet32(struct pci_dev* dev)
- {
- if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
- dev->vendor = PCI_VENDOR_ID_AMD;
- pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD);
- pci_name_device(dev);
- }
- }
- void
- pcibios_update_resource(struct pci_dev *dev, struct resource *root,
- struct resource *res, int resource)
- {
- u32 new, check;
- int reg;
- struct pci_controller* hose = dev->sysdata;
- unsigned long io_offset;
-
- new = res->start;
- if (hose && res->flags & IORESOURCE_IO) {
- io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
- new -= io_offset;
- }
- if (hose && res->flags & IORESOURCE_MEM)
- new -= hose->pci_mem_offset;
- new |= (res->flags & PCI_REGION_FLAG_MASK);
- if (resource < 6) {
- reg = PCI_BASE_ADDRESS_0 + 4*resource;
- } else if (resource == PCI_ROM_RESOURCE) {
- res->flags |= PCI_ROM_ADDRESS_ENABLE;
- reg = dev->rom_base_reg;
- } else {
- /* Somebody might have asked allocation of a non-standard resource */
- return;
- }
- pci_write_config_dword(dev, reg, new);
- pci_read_config_dword(dev, reg, &check);
- if ((new ^ check) & ((new & PCI_BASE_ADDRESS_SPACE_IO) ? PCI_BASE_ADDRESS_IO_MASK : PCI_BASE_ADDRESS_MEM_MASK)) {
- printk(KERN_ERR "PCI: Error while updating region "
- "%s/%d (%08x != %08x)n", dev->slot_name, resource,
- new, check);
- }
- }
- static void
- pcibios_fixup_resources(struct pci_dev *dev)
- {
- struct pci_controller* hose = (struct pci_controller *)dev->sysdata;
- int i;
- unsigned long offset;
- if (!hose) {
- printk(KERN_ERR "No hose for PCI dev %s!n", dev->slot_name);
- return;
- }
- for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
- struct resource *res = dev->resource + i;
- if (!res->start || !res->flags)
- continue;
- if (res->end == 0xffffffff) {
- DBG("PCI:%s Resource %d [%08lx-%08lx] is unassignedn",
- dev->slot_name, i, res->start, res->end);
- res->end -= res->start;
- res->start = 0;
- continue;
- }
- offset = 0;
- if (res->flags & IORESOURCE_MEM) {
- offset = hose->pci_mem_offset;
- } else if (res->flags & IORESOURCE_IO) {
- offset = (unsigned long) hose->io_base_virt
- - isa_io_base;
- }
- if (offset != 0) {
- res->start += offset;
- res->end += offset;
- #ifdef DEBUG
- printk("Fixup res %d (%lx) of dev %s: %lx -> %lxn",
- i, res->flags, dev->slot_name,
- res->start - offset, res->start);
- #endif
- }
- }
- }
- #ifdef CONFIG_ALL_PPC
- static void
- pcibios_fixup_cardbus(struct pci_dev* dev)
- {
- if (_machine != _MACH_Pmac)
- return;
- /*
- * Fix the interrupt routing on the TI1211 chip on the 1999
- * G3 powerbook, which doesn't get initialized properly by OF.
- * Same problem with the 1410 of the new titanium pbook which
- * has the same register.
- */
- if (dev->vendor == PCI_VENDOR_ID_TI
- && (dev->device == PCI_DEVICE_ID_TI_1211 ||
- dev->device == PCI_DEVICE_ID_TI_1410)) {
- u8 val;
- /* 0x8c == TI122X_IRQMUX, 2 says to route the INTA
- signal out the MFUNC0 pin */
- if (pci_read_config_byte(dev, 0x8c, &val) == 0)
- pci_write_config_byte(dev, 0x8c, (val & ~0x0f) | 2);
- /* Disable ISA interrupt mode */
- if (pci_read_config_byte(dev, 0x92, &val) == 0)
- pci_write_config_byte(dev, 0x92, val & ~0x06);
- }
- }
- #endif /* CONFIG_ALL_PPC */
- /*
- * 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)
- {
- struct pci_dev *dev = data;
- if (res->flags & IORESOURCE_IO) {
- unsigned long start = res->start;
- if (size > 0x100) {
- printk(KERN_ERR "PCI: I/O Region %s/%d too large"
- " (%ld bytes)n", dev->slot_name,
- dev->resource - res, size);
- }
- if (start & 0x300) {
- start = (start + 0x3ff) & ~0x3ff;
- res->start = start;
- }
- }
- }
- /*
- * Handle resources of PCI devices. If the world were perfect, we could
- * just allocate all the resource regions and do nothing more. It isn't.
- * On the other hand, we cannot just re-allocate all devices, as it would
- * require us to know lots of host bridge internals. So we attempt to
- * keep as much of the original configuration as possible, but tweak it
- * when it's found to be wrong.
- *
- * Known BIOS problems we have to work around:
- * - I/O or memory regions not configured
- * - regions configured, but not enabled in the command register
- * - bogus I/O addresses above 64K used
- * - expansion ROMs left enabled (this may sound harmless, but given
- * the fact the PCI specs explicitly allow address decoders to be
- * shared between expansion ROMs and other resource regions, it's
- * at least dangerous)
- *
- * Our solution:
- * (1) Allocate resources for all buses behind PCI-to-PCI bridges.
- * This gives us fixed barriers on where we can allocate.
- * (2) Allocate resources for all enabled devices. If there is
- * a collision, just mark the resource as unallocated. Also
- * disable expansion ROMs during this step.
- * (3) Try to allocate resources for disabled devices. If the
- * resources were assigned correctly, everything goes well,
- * if they weren't, they won't disturb allocation of other
- * resources.
- * (4) Assign new addresses to resources which were either
- * not configured at all or misconfigured. If explicitly
- * requested by the user, configure expansion ROM address
- * as well.
- */
- static void __init
- pcibios_allocate_bus_resources(struct list_head *bus_list)
- {
- struct list_head *ln;
- struct pci_bus *bus;
- int i;
- struct resource *res, *pr;
- /* Depth-First Search on bus tree */
- for (ln = bus_list->next; ln != bus_list; ln=ln->next) {
- bus = pci_bus_b(ln);
- for (i = 0; i < 4; ++i) {
- if ((res = bus->resource[i]) == NULL || !res->flags)
- continue;
- if (bus->parent == NULL)
- pr = (res->flags & IORESOURCE_IO)?
- &ioport_resource: &iomem_resource;
- else {
- pr = pci_find_parent_resource(bus->self, res);
- if (pr == res) {
- /* this happens when the generic PCI
- * code (wrongly) decides that this
- * bridge is transparent -- paulus
- */
- continue;
- }
- }
-
- if (pr && request_resource(pr, res) == 0)
- continue;
- printk(KERN_ERR "PCI: Cannot allocate resource region "
- "%d of PCI bridge %dn", i, bus->number);
- DBG("PCI: resource is %lx..%lx (%lx), parent %pn",
- res->start, res->end, res->flags, pr);
- }
- pcibios_allocate_bus_resources(&bus->children);
- }
- }
- static inline void alloc_resource(struct pci_dev *dev, int idx)
- {
- struct resource *pr, *r = &dev->resource[idx];
- DBG("PCI:%s: Resource %d: %08lx-%08lx (f=%lx)n",
- dev->slot_name, idx, r->start, r->end, r->flags);
- pr = pci_find_parent_resource(dev, r);
- if (!pr || request_resource(pr, r) < 0) {
- printk(KERN_ERR "PCI: Cannot allocate resource region %d"
- " of device %sn", idx, dev->slot_name);
- if (pr)
- DBG("PCI: parent is %p: %08lx-%08lx (f=%lx)n",
- pr, pr->start, pr->end, pr->flags);
- /* We'll assign a new address later */
- r->end -= r->start;
- r->start = 0;
- }
- }
- static void __init
- pcibios_allocate_resources(int pass)
- {
- struct pci_dev *dev;
- int idx, disabled;
- u16 command;
- struct resource *r;
- pci_for_each_dev(dev) {
- pci_read_config_word(dev, PCI_COMMAND, &command);
- for (idx = 0; idx < 6; idx++) {
- r = &dev->resource[idx];
- if (r->parent) /* Already allocated */
- continue;
- if (!r->start) /* Not assigned at all */
- continue;
- if (r->flags & IORESOURCE_IO)
- disabled = !(command & PCI_COMMAND_IO);
- else
- disabled = !(command & PCI_COMMAND_MEMORY);
- if (pass == disabled)
- alloc_resource(dev, idx);
- }
- if (pass)
- continue;
- r = &dev->resource[PCI_ROM_RESOURCE];
- if (r->flags & PCI_ROM_ADDRESS_ENABLE) {
- /* Turn the ROM off, leave the resource region, but keep it unregistered. */
- u32 reg;
- DBG("PCI: Switching off ROM of %sn", dev->slot_name);
- r->flags &= ~PCI_ROM_ADDRESS_ENABLE;
- pci_read_config_dword(dev, dev->rom_base_reg, ®);
- pci_write_config_dword(dev, dev->rom_base_reg,
- reg & ~PCI_ROM_ADDRESS_ENABLE);
- }
- }
- }
- static void __init
- pcibios_assign_resources(void)
- {
- struct pci_dev *dev;
- int idx;
- struct resource *r;
- pci_for_each_dev(dev) {
- int class = dev->class >> 8;
- /* Don't touch classless devices and host bridges */
- if (!class || class == PCI_CLASS_BRIDGE_HOST)
- continue;
- for (idx = 0; idx < 6; idx++) {
- r = &dev->resource[idx];
- /*
- * We shall assign a new address to this resource,
- * either because the BIOS (sic) forgot to do so
- * or because we have decided the old address was
- * unusable for some reason.
- */
- if (!r->start && r->end &&
- (!ppc_md.pcibios_enable_device_hook ||
- !ppc_md.pcibios_enable_device_hook(dev, 1)))
- pci_assign_resource(dev, idx);
- }
- #if 0 /* don't assign ROMs */
- r = &dev->resource[PCI_ROM_RESOURCE];
- r->end -= r->start;
- r->start = 0;
- if (r->end)
- pci_assign_resource(dev, PCI_ROM_RESOURCE);
- #endif
- }
- }
- int
- pcibios_enable_resources(struct pci_dev *dev)
- {
- 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++) {
- r = &dev->resource[idx];
- if (!r->start && r->end) {
- printk(KERN_ERR "PCI: Device %s not available because of resource collisionsn", dev->slot_name);
- 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", dev->slot_name, old_cmd, cmd);
- pci_write_config_word(dev, PCI_COMMAND, cmd);
- }
- return 0;
- }
- static int next_controller_index;
- struct pci_controller * __init
- pcibios_alloc_controller(void)
- {
- struct pci_controller *hose;
- hose = (struct pci_controller *)alloc_bootmem(sizeof(*hose));
- memset(hose, 0, sizeof(struct pci_controller));
-
- *hose_tail = hose;
- hose_tail = &hose->next;
- hose->index = next_controller_index++;
- return hose;
- }
- #ifdef CONFIG_ALL_PPC
- /*
- * Functions below are used on OpenFirmware machines.
- */
- static void __openfirmware
- make_one_node_map(struct device_node* node, u8 pci_bus)
- {
- int *bus_range;
- int len;
-
- if (pci_bus >= pci_bus_count)
- return;
- bus_range = (int *) get_property(node, "bus-range", &len);
- if (bus_range == NULL || len < 2 * sizeof(int)) {
- printk(KERN_WARNING "Can't get bus-range for %sn",
- node->full_name);
- return;
- }
- pci_to_OF_bus_map[pci_bus] = bus_range[0];
-
- for (node=node->child; node != 0;node = node->sibling) {
- struct pci_dev* dev;
- unsigned int *class_code, *reg;
-
- class_code = (unsigned int *) get_property(node, "class-code", 0);
- if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
- (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
- continue;
- reg = (unsigned int *)get_property(node, "reg", 0);
- if (!reg)
- continue;
- dev = pci_find_slot(pci_bus, ((reg[0] >> 8) & 0xff));
- if (!dev || !dev->subordinate)
- continue;
- make_one_node_map(node, dev->subordinate->number);
- }
- }
-
- void __openfirmware
- pcibios_make_OF_bus_map(void)
- {
- int i;
- struct pci_controller* hose;
- u8* of_prop_map;
-
- pci_to_OF_bus_map = (u8*)kmalloc(pci_bus_count, GFP_KERNEL);
- if (!pci_to_OF_bus_map) {
- printk(KERN_ERR "Can't allocate OF bus map !n");
- return;
- }
-
- /* We fill the bus map with invalid values, that helps
- * debugging.
- */
- for (i=0; i<pci_bus_count; i++)
- pci_to_OF_bus_map[i] = 0xff;
-
- /* For each hose, we begin searching bridges */
- for(hose=hose_head; hose; hose=hose->next) {
- struct device_node* node;
- node = (struct device_node *)hose->arch_data;
- if (!node)
- continue;
- make_one_node_map(node, hose->first_busno);
- }
- of_prop_map = get_property(find_path_device("/"), "pci-OF-bus-map", 0);
- if (of_prop_map)
- memcpy(of_prop_map, pci_to_OF_bus_map, pci_bus_count);
- #ifdef DEBUG
- printk("PCI->OF bus map:n");
- for (i=0; i<pci_bus_count; i++) {
- if (pci_to_OF_bus_map[i] == 0xff)
- continue;
- printk("%d -> %dn", i, pci_to_OF_bus_map[i]);
- }
- #endif
- }
- typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
- static struct device_node* __openfirmware
- scan_OF_pci_childs(struct device_node* node, pci_OF_scan_iterator filter, void* data)
- {
- struct device_node* sub_node;
-
- for (; node != 0;node = node->sibling) {
- unsigned int *class_code;
-
- if (filter(node, data))
- return node;
- /* For PCI<->PCI bridges or CardBus bridges, we go down
- * Note: some OFs create a parent node "multifunc-device" as
- * a fake root for all functions of a multi-function device,
- * we go down them as well.
- */
- class_code = (unsigned int *) get_property(node, "class-code", 0);
- if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
- (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
- strcmp(node->name, "multifunc-device"))
- continue;
- sub_node = scan_OF_pci_childs(node->child, filter, data);
- if (sub_node)
- return sub_node;
- }
- return NULL;
- }
- static int
- scan_OF_pci_childs_iterator(struct device_node* node, void* data)
- {
- unsigned int *reg;
- u8* fdata = (u8*)data;
-
- reg = (unsigned int *) get_property(node, "reg", 0);
- if (reg && ((reg[0] >> 8) & 0xff) == fdata[1]
- && ((reg[0] >> 16) & 0xff) == fdata[0])
- return 1;
- return 0;
- }
- static struct device_node* __openfirmware
- scan_OF_childs_for_device(struct device_node* node, u8 bus, u8 dev_fn)
- {
- u8 filter_data[2] = {bus, dev_fn};
- return scan_OF_pci_childs(node, scan_OF_pci_childs_iterator, filter_data);
- }
- /*
- * Scans the OF tree for a device node matching a PCI device
- */
- struct device_node*
- pci_device_to_OF_node(struct pci_dev *dev)
- {
- struct pci_controller *hose;
- struct device_node *node;
- int bus;
-
- if (!have_of)
- return NULL;
-
- /* Lookup the hose */
- bus = dev->bus->number;
- hose = pci_bus_to_hose(bus);
- if (!hose)
- return NULL;
- /* Check it has an OF node associated */
- node = (struct device_node *) hose->arch_data;
- if (!node)
- return NULL;
- /* Fixup bus number according to what OF think it is. */
- if (pci_to_OF_bus_map)
- bus = pci_to_OF_bus_map[bus];
- if (bus == 0xff)
- return NULL;
-
- /* Now, lookup childs of the hose */
- return scan_OF_childs_for_device(node->child, bus, dev->devfn);
- }
- /* This routine is meant to be used early during boot, when the
- * PCI bus numbers have not yet been assigned, and you need to
- * issue PCI config cycles to an OF device.
- * It could also be used to "fix" RTAS config cycles if you want
- * to set pci_assign_all_busses to 1 and still use RTAS for PCI
- * config cycles.
- */
- struct pci_controller*
- pci_find_hose_for_OF_device(struct device_node* node)
- {
- if (!have_of)
- return NULL;
- while(node) {
- struct pci_controller* hose;
- for (hose=hose_head;hose;hose=hose->next)
- if (hose->arch_data == node)
- return hose;
- node=node->parent;
- }
- return NULL;
- }
- static int __openfirmware
- find_OF_pci_device_filter(struct device_node* node, void* data)
- {
- return ((void *)node == data);
- }
- /*
- * Returns the PCI device matching a given OF node
- */
- int
- pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
- {
- unsigned int *reg;
- struct pci_controller* hose;
- struct pci_dev* dev;
-
- if (!have_of)
- return -ENODEV;
- /* Make sure it's really a PCI device */
- hose = pci_find_hose_for_OF_device(node);
- if (!hose || !hose->arch_data)
- return -ENODEV;
- if (!scan_OF_pci_childs(((struct device_node*)hose->arch_data)->child,
- find_OF_pci_device_filter, (void *)node))
- return -ENODEV;
- reg = (unsigned int *) get_property(node, "reg", 0);
- if (!reg)
- return -ENODEV;
- *bus = (reg[0] >> 16) & 0xff;
- *devfn = ((reg[0] >> 8) & 0xff);
- /* Ok, here we need some tweak. If we have already renumbered
- * all busses, we can't rely on the OF bus number any more.
- * the pci_to_OF_bus_map is not enough as several PCI busses
- * may match the same OF bus number.
- */
- if (!pci_to_OF_bus_map)
- return 0;
- pci_for_each_dev(dev) {
- if (pci_to_OF_bus_map[dev->bus->number] != *bus)
- continue;
- if (dev->devfn != *devfn)
- continue;
- *bus = dev->bus->number;
- return 0;
- }
- return -ENODEV;
- }
- void __init
- pci_process_bridge_OF_ranges(struct pci_controller *hose,
- struct device_node *dev, int primary)
- {
- unsigned int *ranges, *prev;
- int rlen = 0;
- int memno = 0;
- struct resource *res;
- int np, na = prom_n_addr_cells(dev);
- np = na + 5;
- /* First we try to merge ranges to fix a problem with some pmacs
- * that can have more than 3 ranges, fortunately using contiguous
- * addresses -- BenH
- */
- ranges = (unsigned int *) get_property(dev, "ranges", &rlen);
- prev = NULL;
- while ((rlen -= np * sizeof(unsigned int)) >= 0) {
- if (prev) {
- if (prev[0] == ranges[0] && prev[1] == ranges[1] &&
- (prev[2] + prev[na+4]) == ranges[2] &&
- (prev[na+2] + prev[na+4]) == ranges[na+2]) {
- prev[na+4] += ranges[na+4];
- ranges[0] = 0;
- ranges += np;
- continue;
- }
- }
- prev = ranges;
- ranges += np;
- }
- /*
- * The ranges property is laid out as an array of elements,
- * each of which comprises:
- * cells 0 - 2: a PCI address
- * cells 3 or 3+4: a CPU physical address
- * (size depending on dev->n_addr_cells)
- * cells 4+5 or 5+6: the size of the range
- */
- rlen = 0;
- hose->io_base_phys = 0;
- ranges = (unsigned int *) get_property(dev, "ranges", &rlen);
- while ((rlen -= np * sizeof(unsigned int)) >= 0) {
- res = NULL;
- switch (ranges[0] >> 24) {
- case 1: /* I/O space */
- if (ranges[2] != 0)
- break;
- hose->io_base_phys = ranges[na+2];
- hose->io_base_virt = ioremap(ranges[na+2], ranges[na+4]);
- if (primary)
- isa_io_base = (unsigned long) hose->io_base_virt;
- res = &hose->io_resource;
- res->flags = IORESOURCE_IO;
- res->start = ranges[2];
- break;
- case 2: /* memory space */
- memno = 0;
- if (ranges[1] == 0 && ranges[2] == 0
- && ranges[na+4] <= (16 << 20)) {
- /* 1st 16MB, i.e. ISA memory area */
- if (primary)
- isa_mem_base = ranges[na+2];
- memno = 1;
- }
- while (memno < 3 && hose->mem_resources[memno].flags)
- ++memno;
- if (memno == 0)
- hose->pci_mem_offset = ranges[na+2] - ranges[2];
- if (memno < 3) {
- res = &hose->mem_resources[memno];
- res->flags = IORESOURCE_MEM;
- res->start = ranges[na+2];
- }
- break;
- }
- if (res != NULL) {
- res->name = dev->full_name;
- res->end = res->start + ranges[na+4] - 1;
- res->parent = NULL;
- res->sibling = NULL;
- res->child = NULL;
- }
- ranges += np;
- }
- }
- #endif /* CONFIG_ALL_PPC */
- void __init
- pcibios_init(void)
- {
- struct pci_controller *hose;
- struct pci_bus *bus;
- int next_busno;
- printk(KERN_INFO "PCI: Probing PCI hardwaren");
- /* Scan all of the recorded PCI controllers. */
- for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
- if (pci_assign_all_busses)
- hose->first_busno = next_busno;
- hose->last_busno = 0xff;
- bus = pci_scan_bus(hose->first_busno, hose->ops, hose);
- hose->last_busno = bus->subordinate;
- if (pci_assign_all_busses || next_busno <= hose->last_busno)
- next_busno = hose->last_busno+1;
- }
- pci_bus_count = next_busno;
- /* OpenFirmware based machines need a map of OF bus
- * numbers vs. kernel bus numbers since we may have to
- * remap them.
- */
- if (pci_assign_all_busses && have_of)
- pcibios_make_OF_bus_map();
- /* Call machine dependant fixup */
- if (ppc_md.pcibios_fixup)
- ppc_md.pcibios_fixup();
- /* Allocate and assign resources */
- pcibios_allocate_bus_resources(&pci_root_buses);
- pcibios_allocate_resources(0);
- pcibios_allocate_resources(1);
- pcibios_assign_resources();
- /* Call machine dependent post-init code */
- if (ppc_md.pcibios_after_init)
- ppc_md.pcibios_after_init();
- }
- int __init
- pcibios_assign_all_busses(void)
- {
- return pci_assign_all_busses;
- }
- void __init
- pcibios_fixup_pbus_ranges(struct pci_bus * bus, struct pbus_set_ranges_data * ranges)
- {
- ranges->io_start -= bus->resource[0]->start;
- ranges->io_end -= bus->resource[0]->start;
- ranges->mem_start -= bus->resource[1]->start;
- ranges->mem_end -= bus->resource[1]->start;
- }
- unsigned long resource_fixup(struct pci_dev * dev, struct resource * res,
- unsigned long start, unsigned long size)
- {
- return start;
- }
- void __init pcibios_fixup_bus(struct pci_bus *bus)
- {
- struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
- unsigned long io_offset;
- struct resource *res;
- int i;
- io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
- if (bus->parent == NULL) {
- /* This is a host bridge - fill in its resources */
- hose->bus = bus;
- bus->resource[0] = res = &hose->io_resource;
- if (!res->flags) {
- if (io_offset)
- printk(KERN_ERR "I/O resource not set for host"
- " bridge %dn", hose->index);
- res->start = 0;
- res->end = IO_SPACE_LIMIT;
- res->flags = IORESOURCE_IO;
- }
- res->start += io_offset;
- res->end += io_offset;
- for (i = 0; i < 3; ++i) {
- res = &hose->mem_resources[i];
- if (!res->flags) {
- if (i > 0)
- continue;
- printk(KERN_ERR "Memory resource not set for "
- "host bridge %dn", hose->index);
- res->start = hose->pci_mem_offset;
- res->end = ~0U;
- res->flags = IORESOURCE_MEM;
- }
- bus->resource[i+1] = res;
- }
- } else {
- /* This is a subordinate bridge */
- pci_read_bridge_bases(bus);
- for (i = 0; i < 4; ++i) {
- if ((res = bus->resource[i]) == NULL)
- continue;
- if (!res->flags)
- continue;
- if (io_offset && (res->flags & IORESOURCE_IO)) {
- res->start += io_offset;
- res->end += io_offset;
- } else if (hose->pci_mem_offset
- && (res->flags & IORESOURCE_MEM)) {
- res->start += hose->pci_mem_offset;
- res->end += hose->pci_mem_offset;
- }
- }
- }
- if (ppc_md.pcibios_fixup_bus)
- ppc_md.pcibios_fixup_bus(bus);
- }
- char __init *pcibios_setup(char *str)
- {
- return str;
- }
- /* the next one is stolen from the alpha port... */
- void __init
- pcibios_update_irq(struct pci_dev *dev, int irq)
- {
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
- /* XXX FIXME - update OF device tree node interrupt property */
- }
- int pcibios_enable_device(struct pci_dev *dev)
- {
- u16 cmd, old_cmd;
- int idx;
- struct resource *r;
- if (ppc_md.pcibios_enable_device_hook)
- if (ppc_md.pcibios_enable_device_hook(dev, 0))
- return -EINVAL;
-
- pci_read_config_word(dev, PCI_COMMAND, &cmd);
- old_cmd = cmd;
- for (idx=0; idx<6; idx++) {
- r = &dev->resource[idx];
- if (!r->start && r->end) {
- printk(KERN_ERR "PCI: Device %s not available because of resource collisionsn", dev->slot_name);
- return -EINVAL;
- }
- if (r->flags & IORESOURCE_IO)
- cmd |= PCI_COMMAND_IO;
- if (r->flags & IORESOURCE_MEM)
- cmd |= PCI_COMMAND_MEMORY;
- }
- if (cmd != old_cmd) {
- printk("PCI: Enabling device %s (%04x -> %04x)n",
- dev->slot_name, old_cmd, cmd);
- pci_write_config_word(dev, PCI_COMMAND, cmd);
- }
- return 0;
- }
- struct pci_controller*
- pci_bus_to_hose(int bus)
- {
- struct pci_controller* hose = hose_head;
- for (; hose; hose = hose->next)
- if (bus >= hose->first_busno && bus <= hose->last_busno)
- return hose;
- return NULL;
- }
- void*
- pci_bus_io_base(unsigned int bus)
- {
- struct pci_controller *hose;
- hose = pci_bus_to_hose(bus);
- if (!hose)
- return NULL;
- return hose->io_base_virt;
- }
- unsigned long
- pci_bus_io_base_phys(unsigned int bus)
- {
- struct pci_controller *hose;
- hose = pci_bus_to_hose(bus);
- if (!hose)
- return 0;
- return hose->io_base_phys;
- }
- unsigned long
- pci_bus_mem_base_phys(unsigned int bus)
- {
- struct pci_controller *hose;
- hose = pci_bus_to_hose(bus);
- if (!hose)
- return 0;
- return hose->pci_mem_offset;
- }
- unsigned long
- pci_resource_to_bus(struct pci_dev *pdev, struct resource *res)
- {
- /* Hack alert again ! See comments in chrp_pci.c
- */
- struct pci_controller* hose =
- (struct pci_controller *)pdev->sysdata;
- if (hose && res->flags & IORESOURCE_MEM)
- return res->start - hose->pci_mem_offset;
- /* We may want to do something with IOs here... */
- return res->start;
- }
- /*
- * Return the index of the PCI controller for device pdev.
- */
- int pci_controller_num(struct pci_dev *dev)
- {
- struct pci_controller *hose = (struct pci_controller *) dev->sysdata;
- return hose->index;
- }
- /*
- * Platform support for /proc/bus/pci/X/Y mmap()s,
- * modelled on the sparc64 implementation by Dave Miller.
- * -- paulus.
- */
- /*
- * Adjust vm_pgoff of VMA such that it is the physical page offset
- * corresponding to the 32-bit pci bus offset for DEV requested by the user.
- *
- * Basically, the user finds the base address for his device which he wishes
- * to mmap. They read the 32-bit value from the config space base register,
- * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
- * offset parameter of mmap on /proc/bus/pci/XXX for that device.
- *
- * Returns negative error code on failure, zero on success.
- */
- static __inline__ int
- __pci_mmap_make_offset(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state)
- {
- struct pci_controller *hose = (struct pci_controller *) dev->sysdata;
- unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
- unsigned long io_offset = 0;
- int i, res_bit;
- if (hose == 0)
- return -EINVAL; /* should never happen */
- /* If memory, add on the PCI bridge address offset */
- if (mmap_state == pci_mmap_mem) {
- offset += hose->pci_mem_offset;
- res_bit = IORESOURCE_MEM;
- } else {
- io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
- offset += io_offset;
- res_bit = IORESOURCE_IO;
- }
- /*
- * Check that the offset requested corresponds to one of the
- * resources of the device.
- */
- for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
- struct resource *rp = &dev->resource[i];
- int flags = rp->flags;
- /* treat ROM as memory (should be already) */
- if (i == PCI_ROM_RESOURCE)
- flags |= IORESOURCE_MEM;
- /* Active and same type? */
- if ((flags & res_bit) == 0)
- continue;
- /* In the range of this resource? */
- if (offset < (rp->start & PAGE_MASK) || offset > rp->end)
- continue;
- /* found it! construct the final physical address */
- if (mmap_state == pci_mmap_io)
- offset += hose->io_base_phys - io_offset;
- vma->vm_pgoff = offset >> PAGE_SHIFT;
- return 0;
- }
- return -EINVAL;
- }
- /*
- * Set vm_flags of VMA, as appropriate for this architecture, for a pci device
- * mapping.
- */
- static __inline__ void
- __pci_mmap_set_flags(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state)
- {
- vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
- }
- /*
- * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
- * device mapping.
- */
- static __inline__ void
- __pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
- {
- int prot = pgprot_val(vma->vm_page_prot);
- /* XXX would be nice to have a way to ask for write-through */
- prot |= _PAGE_NO_CACHE;
- if (!write_combine)
- prot |= _PAGE_GUARDED;
- vma->vm_page_prot = __pgprot(prot);
- }
- /*
- * Perform the actual remap of the pages for a PCI device mapping, as
- * appropriate for this architecture. The region in the process to map
- * is described by vm_start and vm_end members of VMA, the base physical
- * address is found in vm_pgoff.
- * The pci device structure is provided so that architectures may make mapping
- * decisions on a per-device or per-bus basis.
- *
- * Returns a negative error code on failure, zero on success.
- */
- int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state,
- int write_combine)
- {
- int ret;
- ret = __pci_mmap_make_offset(dev, vma, mmap_state);
- if (ret < 0)
- return ret;
- __pci_mmap_set_flags(dev, vma, mmap_state);
- __pci_mmap_set_pgprot(dev, vma, mmap_state, write_combine);
- ret = remap_page_range(vma->vm_start, vma->vm_pgoff << PAGE_SHIFT,
- vma->vm_end - vma->vm_start, vma->vm_page_prot);
- return ret;
- }
- /* Obsolete functions. Should be removed once the symbios driver
- * is fixed
- */
- unsigned long
- phys_to_bus(unsigned long pa)
- {
- struct pci_controller *hose;
- int i;
- for (hose = hose_head; hose; hose = hose->next) {
- for (i = 0; i < 3; ++i) {
- if (pa >= hose->mem_resources[i].start
- && pa <= hose->mem_resources[i].end) {
- /*
- * XXX the hose->pci_mem_offset really
- * only applies to mem_resources[0].
- * We need a way to store an offset for
- * the others. -- paulus
- */
- if (i == 0)
- pa -= hose->pci_mem_offset;
- return pa;
- }
- }
- }
- /* hmmm, didn't find it */
- return 0;
- }
- unsigned long
- pci_phys_to_bus(unsigned long pa, int busnr)
- {
- struct pci_controller* hose = pci_bus_to_hose(busnr);
- if (!hose)
- return pa;
- return pa - hose->pci_mem_offset;
- }
- unsigned long
- pci_bus_to_phys(unsigned int ba, int busnr)
- {
- struct pci_controller* hose = pci_bus_to_hose(busnr);
- if (!hose)
- return ba;
- return ba + hose->pci_mem_offset;
- }
- /* 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
- * root bridge.
- * Note that the returned IO or memory base is a physical address
- */
- long
- sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
- {
- struct pci_controller* hose = pci_bus_to_hose(bus);
- long result = -EOPNOTSUPP;
- if (!hose)
- return -ENODEV;
-
- switch (which) {
- case IOBASE_BRIDGE_NUMBER:
- return (long)hose->first_busno;
- case IOBASE_MEMORY:
- return (long)hose->pci_mem_offset;
- case IOBASE_IO:
- return (long)hose->io_base_phys;
- case IOBASE_ISA_IO:
- return (long)isa_io_base;
- case IOBASE_ISA_MEM:
- return (long)isa_mem_base;
- }
- return result;
- }
- /*
- * Null PCI config access functions, for the case when we can't
- * find a hose.
- */
- #define NULL_PCI_OP(rw, size, type)
- static int
- null_##rw##_config_##size(struct pci_dev *dev, int offset, type val)
- {
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- NULL_PCI_OP(read, byte, u8 *)
- NULL_PCI_OP(read, word, u16 *)
- NULL_PCI_OP(read, dword, u32 *)
- NULL_PCI_OP(write, byte, u8)
- NULL_PCI_OP(write, word, u16)
- NULL_PCI_OP(write, dword, u32)
- static struct pci_ops null_pci_ops =
- {
- null_read_config_byte,
- null_read_config_word,
- null_read_config_dword,
- null_write_config_byte,
- null_write_config_word,
- null_write_config_dword
- };
- /*
- * These functions are used early on before PCI scanning is done
- * and all of the pci_dev and pci_bus structures have been created.
- */
- static struct pci_dev *
- fake_pci_dev(struct pci_controller *hose, int busnr, int devfn)
- {
- static struct pci_dev dev;
- static struct pci_bus bus;
- if (hose == 0) {
- hose = pci_bus_to_hose(busnr);
- if (hose == 0)
- printk(KERN_ERR "Can't find hose for PCI bus %d!n", busnr);
- }
- dev.bus = &bus;
- dev.sysdata = hose;
- dev.devfn = devfn;
- bus.number = busnr;
- bus.ops = hose? hose->ops: &null_pci_ops;
- return &dev;
- }
- #define EARLY_PCI_OP(rw, size, type)
- int early_##rw##_config_##size(struct pci_controller *hose, int bus,
- int devfn, int offset, type value)
- {
- return pci_##rw##_config_##size(fake_pci_dev(hose, bus, devfn),
- offset, value);
- }
- EARLY_PCI_OP(read, byte, u8 *)
- EARLY_PCI_OP(read, word, u16 *)
- EARLY_PCI_OP(read, dword, u32 *)
- EARLY_PCI_OP(write, byte, u8)
- EARLY_PCI_OP(write, word, u16)
- EARLY_PCI_OP(write, dword, u32)