pci-sh7751.c
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上传日期:2013-02-24
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文件大小:15k
- /*
- * Low-Level PCI Support for the SH7751
- *
- * Dustin McIntire (dustin@sensoria.com)
- * Derived from arch/i386/kernel/pci-*.c which bore the message:
- * (c) 1999--2000 Martin Mares <mj@ucw.cz>
- *
- * May be copied or modified under the terms of the GNU General Public
- * License. See linux/COPYING for more information.
- *
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/pci.h>
- #include <linux/sched.h>
- #include <linux/ioport.h>
- #include <linux/errno.h>
- #include <linux/irq.h>
- #include <asm/machvec.h>
- #include <asm/io.h>
- #include <asm/pci-sh7751.h>
- struct pci_ops *pci_check_direct(void);
- void pcibios_resource_survey(void);
- static u8 pcibios_swizzle(struct pci_dev *dev, u8 *pin);
- static int pcibios_lookup_irq(struct pci_dev *dev, u8 slot, u8 pin);
- unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1;
- int pcibios_last_bus = -1;
- struct pci_bus *pci_root_bus;
- struct pci_ops *pci_root_ops;
- /*
- * Direct access to PCI hardware...
- */
- #ifdef CONFIG_PCI_DIRECT
- #define CONFIG_CMD(dev, where) (0x80000000 | (dev->bus->number << 16) | (dev->devfn << 8) | (where & ~3))
- #define PCI_REG(reg) (SH7751_PCIREG_BASE+reg)
- /*
- * Functions for accessing PCI configuration space with type 1 accesses
- */
- static int pci_conf1_read_config_byte(struct pci_dev *dev, int where, u8 *value)
- {
- u32 word;
- unsigned long flags;
- /* PCIPDR may only be accessed as 32 bit words,
- * so we must do byte alignment by hand
- */
- save_and_cli(flags);
- outl(CONFIG_CMD(dev,where), PCI_REG(SH7751_PCIPAR));
- word = inl(PCI_REG(SH7751_PCIPDR));
- restore_flags(flags);
- switch (where & 0x3) {
- case 3:
- *value = (u8)(word >> 24);
- break;
- case 2:
- *value = (u8)(word >> 16);
- break;
- case 1:
- *value = (u8)(word >> 8);
- break;
- default:
- *value = (u8)word;
- break;
- }
- PCIDBG(4,"pci_conf1_read_config_byte@0x%08x=0x%xn",
- CONFIG_CMD(dev,where),*value);
- return PCIBIOS_SUCCESSFUL;
- }
- static int pci_conf1_read_config_word(struct pci_dev *dev, int where, u16 *value)
- {
- u32 word;
- unsigned long flags;
- /* PCIPDR may only be accessed as 32 bit words,
- * so we must do word alignment by hand
- */
- save_and_cli(flags);
- outl(CONFIG_CMD(dev,where), PCI_REG(SH7751_PCIPAR));
- word = inl(PCI_REG(SH7751_PCIPDR));
- restore_flags(flags);
- switch (where & 0x3) {
- case 3:
- // This should never happen...
- printk(KERN_ERR "PCI BIOS: read_config_word: Illegal u16 alignment");
- return PCIBIOS_BAD_REGISTER_NUMBER;
- case 2:
- *value = (u16)(word >> 16);
- break;
- case 1:
- *value = (u16)(word >> 8);
- break;
- default:
- *value = (u16)word;
- break;
- }
- PCIDBG(4,"pci_conf1_read_config_word@0x%08x=0x%xn",
- CONFIG_CMD(dev,where),*value);
- return PCIBIOS_SUCCESSFUL;
- }
- static int pci_conf1_read_config_dword(struct pci_dev *dev, int where, u32 *value)
- {
- unsigned long flags;
-
- save_and_cli(flags);
- outl(CONFIG_CMD(dev,where), PCI_REG(SH7751_PCIPAR));
- *value = inl(PCI_REG(SH7751_PCIPDR));
- restore_flags(flags);
- PCIDBG(4,"pci_conf1_read_config_dword@0x%08x=0x%xn",
- CONFIG_CMD(dev,where),*value);
- return PCIBIOS_SUCCESSFUL;
- }
- static int pci_conf1_write_config_byte(struct pci_dev *dev, int where, u8 value)
- {
- u32 word;
- u32 shift = (where & 3) * 8;
- u32 mask = ((1 << 8) - 1) << shift; // create the byte mask
- unsigned long flags;
- /* Since SH7751 only does 32bit access we'll have to do a
- * read,mask,write operation
- */
- save_and_cli(flags);
- outl(CONFIG_CMD(dev,where), PCI_REG(SH7751_PCIPAR));
- word = inl(PCI_REG(SH7751_PCIPDR)) ;
- word &= ~mask;
- word |= value << shift;
-
- outl(word, PCI_REG(SH7751_PCIPDR));
- restore_flags(flags);
- PCIDBG(4,"pci_conf1_write_config_byte@0x%08x=0x%xn",
- CONFIG_CMD(dev,where),word);
- return PCIBIOS_SUCCESSFUL;
- }
- static int pci_conf1_write_config_word(struct pci_dev *dev, int where, u16 value)
- {
- u32 word;
- u32 shift = (where & 3) * 8;
- u32 mask = ((1 << 16) - 1) << shift; // create the word mask
- unsigned long flags;
- /* Since SH7751 only does 32bit access we'll have to do a
- * read,mask,write operation. We'll allow an odd byte offset,
- * though it should be illegal.
- */
- if (shift == 24)
- return PCIBIOS_BAD_REGISTER_NUMBER;
- save_and_cli(flags);
- outl(CONFIG_CMD(dev,where), PCI_REG(SH7751_PCIPAR));
- word = inl(PCI_REG(SH7751_PCIPDR)) ;
- word &= ~mask;
- word |= value << shift;
-
- outl(value, PCI_REG(SH7751_PCIPDR));
- restore_flags(flags);
- PCIDBG(4,"pci_conf1_write_config_word@0x%08x=0x%xn",
- CONFIG_CMD(dev,where),word);
- return PCIBIOS_SUCCESSFUL;
- }
- static int pci_conf1_write_config_dword(struct pci_dev *dev, int where, u32 value)
- {
- unsigned long flags;
- save_and_cli(flags);
- outl(CONFIG_CMD(dev,where), PCI_REG(SH7751_PCIPAR));
- outl(value, PCI_REG(SH7751_PCIPDR));
- restore_flags(flags);
- PCIDBG(4,"pci_conf1_write_config_dword@0x%08x=0x%xn",
- CONFIG_CMD(dev,where),value);
- return PCIBIOS_SUCCESSFUL;
- }
- #undef CONFIG_CMD
- static struct pci_ops pci_direct_conf1 = {
- pci_conf1_read_config_byte,
- pci_conf1_read_config_word,
- pci_conf1_read_config_dword,
- pci_conf1_write_config_byte,
- pci_conf1_write_config_word,
- pci_conf1_write_config_dword
- };
- struct pci_ops * __init pci_check_direct(void)
- {
- unsigned int tmp, id;
- /* check for SH7751 hardware */
- id = (SH7751_DEVICE_ID << 16) | SH7751_VENDOR_ID;
- if(inl(SH7751_PCIREG_BASE+SH7751_PCICONF0) != id) {
- PCIDBG(2,"PCI: This is not an SH7751n");
- return NULL;
- }
- /*
- * Check if configuration works.
- */
- if (pci_probe & PCI_PROBE_CONF1) {
- tmp = inl (PCI_REG(SH7751_PCIPAR));
- outl (0x80000000, PCI_REG(SH7751_PCIPAR));
- if (inl (PCI_REG(SH7751_PCIPAR)) == 0x80000000) {
- outl (tmp, PCI_REG(SH7751_PCIPAR));
- printk(KERN_INFO "PCI: Using configuration type 1n");
- request_region(PCI_REG(SH7751_PCIPAR), 8, "PCI conf1");
- return &pci_direct_conf1;
- }
- outl (tmp, PCI_REG(SH7751_PCIPAR));
- }
- PCIDBG(2,"PCI: pci_check_direct failedn");
- return NULL;
- }
- #endif
- /*
- * BIOS32 and PCI BIOS handling.
- *
- * The BIOS version of the pci functions is not yet implemented but it is left
- * in for completeness. Currently an error will be generated at compile time.
- */
-
- #ifdef CONFIG_PCI_BIOS
- #error PCI BIOS is not yet supported on SH7751
- #endif /* CONFIG_PCI_BIOS */
- /***************************************************************************************/
- /*
- * Handle bus scanning and fixups ....
- */
- /*
- * Discover remaining PCI buses in case there are peer host bridges.
- * We use the number of last PCI bus provided by the PCI BIOS.
- */
- static void __init pcibios_fixup_peer_bridges(void)
- {
- int n;
- struct pci_bus bus;
- struct pci_dev dev;
- u16 l;
- if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
- return;
- PCIDBG(2,"PCI: Peer bridge fixupn");
- for (n=0; n <= pcibios_last_bus; n++) {
- if (pci_bus_exists(&pci_root_buses, n))
- continue;
- bus.number = n;
- bus.ops = pci_root_ops;
- dev.bus = &bus;
- for(dev.devfn=0; dev.devfn<256; dev.devfn += 8)
- if (!pci_read_config_word(&dev, PCI_VENDOR_ID, &l) &&
- l != 0x0000 && l != 0xffff) {
- PCIDBG(3,"Found device at %02x:%02x [%04x]n", n, dev.devfn, l);
- printk(KERN_INFO "PCI: Discovered peer bus %02xn", n);
- pci_scan_bus(n, pci_root_ops, NULL);
- break;
- }
- }
- }
- static void __init pci_fixup_ide_bases(struct pci_dev *d)
- {
- int i;
- /*
- * PCI IDE controllers use non-standard I/O port decoding, respect it.
- */
- if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
- return;
- PCIDBG(3,"PCI: IDE base address fixup for %sn", d->slot_name);
- for(i=0; i<4; i++) {
- struct resource *r = &d->resource[i];
- if ((r->start & ~0x80) == 0x374) {
- r->start |= 2;
- r->end = r->start;
- }
- }
- }
- /* Add future fixups here... */
- struct pci_fixup pcibios_fixups[] = {
- { PCI_FIXUP_HEADER, PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases },
- { 0 }
- };
- void __init pcibios_fixup_pbus_ranges(struct pci_bus *b,
- struct pbus_set_ranges_data *range)
- {
- /* No fixups needed */
- }
- /*
- * Called after each bus is probed, but before its children
- * are examined.
- */
- void __init pcibios_fixup_bus(struct pci_bus *b)
- {
- pci_read_bridge_bases(b);
- }
- /*
- * Initialization. Try all known PCI access methods. Note that we support
- * using both PCI BIOS and direct access: in such cases, we use I/O ports
- * to access config space.
- *
- * Note that the platform specific initialization (BSC registers, and memory
- * space mapping) will be called via the machine vectors (sh_mv.mv_pci_init()) if it
- * exitst and via the platform defined function pcibios_init_platform().
- * See pci_bigsur.c for implementation;
- *
- * The BIOS version of the pci functions is not yet implemented but it is left
- * in for completeness. Currently an error will be genereated at compile time.
- */
- void __init pcibios_init(void)
- {
- struct pci_ops *bios = NULL;
- struct pci_ops *dir = NULL;
- PCIDBG(1,"PCI: Starting intialization.n");
- #ifdef CONFIG_PCI_BIOS
- if ((pci_probe & PCI_PROBE_BIOS) && ((bios = pci_find_bios()))) {
- pci_probe |= PCI_BIOS_SORT;
- pci_bios_present = 1;
- }
- #endif
- #ifdef CONFIG_PCI_DIRECT
- if (pci_probe & PCI_PROBE_CONF1 )
- dir = pci_check_direct();
- #endif
- if (dir) {
- pci_root_ops = dir;
- if(!pcibios_init_platform())
- PCIDBG(1,"PCI: Initialization failedn");
- if (sh_mv.mv_init_pci != NULL)
- sh_mv.mv_init_pci();
- }
- else if (bios)
- pci_root_ops = bios;
- else {
- PCIDBG(1,"PCI: No PCI bus detectedn");
- return;
- }
- PCIDBG(1,"PCI: Probing PCI hardwaren");
- pci_root_bus = pci_scan_bus(0, pci_root_ops, NULL);
- //pci_assign_unassigned_resources();
- pci_fixup_irqs(pcibios_swizzle, pcibios_lookup_irq);
- pcibios_fixup_peer_bridges();
- pcibios_resource_survey();
- #ifdef CONFIG_PCI_BIOS
- if ((pci_probe & PCI_BIOS_SORT) && !(pci_probe & PCI_NO_SORT))
- pcibios_sort();
- #endif
- }
- char * __init pcibios_setup(char *str)
- {
- if (!strcmp(str, "off")) {
- pci_probe = 0;
- return NULL;
- }
- #ifdef CONFIG_PCI_BIOS
- else if (!strcmp(str, "bios")) {
- pci_probe = PCI_PROBE_BIOS;
- return NULL;
- } else if (!strcmp(str, "nobios")) {
- pci_probe &= ~PCI_PROBE_BIOS;
- return NULL;
- } else if (!strcmp(str, "nosort")) {
- pci_probe |= PCI_NO_SORT;
- return NULL;
- } else if (!strcmp(str, "biosirq")) {
- pci_probe |= PCI_BIOS_IRQ_SCAN;
- return NULL;
- }
- #endif
- #ifdef CONFIG_PCI_DIRECT
- else if (!strcmp(str, "conf1")) {
- pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
- return NULL;
- }
- #endif
- else if (!strcmp(str, "rom")) {
- pci_probe |= PCI_ASSIGN_ROMS;
- return NULL;
- } else if (!strncmp(str, "lastbus=", 8)) {
- pcibios_last_bus = simple_strtol(str+8, NULL, 0);
- return NULL;
- }
- return str;
- }
- /*
- * Allocate the bridge and device resources
- */
- static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
- {
- struct list_head *ln;
- struct pci_bus *bus;
- struct pci_dev *dev;
- int idx;
- struct resource *r, *pr;
-
- PCIDBG(2,"PCI: pcibios_allocate_bus_reasources calledn" );
- /* Depth-First Search on bus tree */
- for (ln=bus_list->next; ln != bus_list; ln=ln->next) {
- bus = pci_bus_b(ln);
- if ((dev = bus->self)) {
- for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
- r = &dev->resource[idx];
- if (!r->start)
- continue;
- pr = pci_find_parent_resource(dev, r);
- if (!pr || request_resource(pr, r) < 0)
- printk(KERN_ERR "PCI: Cannot allocate resource region %d of bridge %sn", idx, dev->slot_name);
- }
- }
- pcibios_allocate_bus_resources(&bus->children);
- }
- }
- static void __init pcibios_allocate_resources(int pass)
- {
- struct pci_dev *dev;
- int idx, disabled;
- u16 command;
- struct resource *r, *pr;
- PCIDBG(2,"PCI: pcibios_allocate_resources pass %d calledn", pass);
- 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) /* Address not assigned at all */
- continue;
- if (r->flags & IORESOURCE_IO)
- disabled = !(command & PCI_COMMAND_IO);
- else
- disabled = !(command & PCI_COMMAND_MEMORY);
- if (pass == disabled) {
- PCIDBG(3,"PCI: Resource %08lx-%08lx (f=%lx, d=%d, p=%d)n",
- r->start, r->end, r->flags, disabled, pass);
- 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);
- /* We'll assign a new address later */
- r->end -= r->start;
- r->start = 0;
- }
- }
- }
- if (!pass) {
- 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;
- PCIDBG(3,"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;
- PCIDBG(2,"PCI: pcibios_assign_resources calledn");
- 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];
- /*
- * Don't touch IDE controllers and I/O ports of video cards!
- */
- if ((class == PCI_CLASS_STORAGE_IDE && idx < 4) ||
- (class == PCI_CLASS_DISPLAY_VGA && (r->flags & IORESOURCE_IO)))
- continue;
- /*
- * We shall assign a new address to this resource, either because
- * the BIOS forgot to do so or because we have decided the old
- * address was unusable for some reason.
- */
- if (!r->start && r->end)
- pci_assign_resource(dev, idx);
- }
- if (pci_probe & PCI_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);
- }
- }
- }
- void __init pcibios_resource_survey(void)
- {
- PCIDBG(1,"PCI: Allocating resourcesn");
- pcibios_allocate_bus_resources(&pci_root_buses);
- pcibios_allocate_resources(0);
- pcibios_allocate_resources(1);
- pcibios_assign_resources();
- }
- /***************************************************************************************/
- /*
- * IRQ functions
- */
- static u8 __init pcibios_swizzle(struct pci_dev *dev, u8 *pin)
- {
- /* no swizzling */
- return PCI_SLOT(dev->devfn);
- }
- static int pcibios_lookup_irq(struct pci_dev *dev, u8 slot, u8 pin)
- {
- int irq = -1;
- /* now lookup the actual IRQ on a platform specific basis (pci-'platform'.c) */
- irq = pcibios_map_platform_irq(slot,pin);
- if( irq < 0 ) {
- PCIDBG(3,"PCI: Error mapping IRQ on device %sn", dev->name);
- return irq;
- }
-
- PCIDBG(2,"Setting IRQ for slot %s to %dn", dev->slot_name, irq);
- return irq;
- }