| /* |
| * PCI Bus Services, see include/linux/pci.h for further explanation. |
| * |
| * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter, |
| * David Mosberger-Tang |
| * |
| * Copyright 1997 -- 1999 Martin Mares <mj@atrey.karlin.mff.cuni.cz> |
| * |
| * Copyright 2003 -- Eric Biederman <ebiederman@lnxi.com> |
| */ |
| |
| #include <console/console.h> |
| #include <stdlib.h> |
| #include <stdint.h> |
| #include <bitops.h> |
| #include <string.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <device/pci_ids.h> |
| |
| static unsigned int pci_scan_bridge(struct device *bus, unsigned int max); |
| |
| /** Given a device and register, read the size of the BAR for that register. |
| * @param dev Pointer to the device structure |
| * @param resource Pointer to the resource structure |
| * @param index Address of the pci configuration register |
| */ |
| static void pci_get_resource(struct device *dev, struct resource *resource, unsigned long index) |
| { |
| uint32_t addr, size, base; |
| unsigned long type; |
| |
| /* Initialize the resources to nothing */ |
| resource->base = 0; |
| resource->size = 0; |
| resource->align = 0; |
| resource->gran = 0; |
| resource->limit = 0; |
| resource->flags = 0; |
| resource->index = index; |
| |
| pci_read_config_dword(dev, index, &addr); |
| if (addr == 0xffffffffUL) |
| return; |
| |
| /* FIXME: more consideration for 64-bit PCI devices, |
| * we currently detect their size but otherwise |
| * treat them as 32-bit resources |
| */ |
| /* get the size */ |
| pci_write_config_dword(dev, index, ~0); |
| pci_read_config_dword(dev, index, &size); |
| |
| /* get the minimum value the bar can be set to */ |
| pci_write_config_dword(dev, index, 0); |
| pci_read_config_dword(dev, index, &base); |
| |
| /* restore addr */ |
| pci_write_config_dword(dev, index, addr); |
| |
| /* |
| * some broken hardware has read-only registers that do not |
| * really size correctly. You can tell this if addr == size |
| * Example: the acer m7229 has BARs 1-4 normally read-only. |
| * so BAR1 at offset 0x10 reads 0x1f1. If you size that register |
| * by writing 0xffffffff to it, it will read back as 0x1f1 -- a |
| * violation of the spec. |
| * We catch this case and ignore it by settting size and type to 0. |
| * This incidentally catches the common case where registers |
| * read back as 0 for both address and size. |
| */ |
| if ((addr == size) && (addr == base)) { |
| if (size != 0) { |
| printk_debug( |
| "PCI: %02x:%02x.%01x register %02x(%08x), read-only ignoring it\n", |
| dev->bus->secondary, |
| PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
| index, addr); |
| } |
| resource->flags = 0; |
| } |
| /* Now compute the actual size, See PCI Spec 6.2.5.1 ... */ |
| else if (size & PCI_BASE_ADDRESS_SPACE_IO) { |
| type = size & (~PCI_BASE_ADDRESS_IO_MASK); |
| /* BUG! Top 16 bits can be zero (or not) |
| * So set them to 0xffff so they go away ... |
| */ |
| resource->size = (~((size | 0xffff0000) & PCI_BASE_ADDRESS_IO_MASK)) +1; |
| resource->align = log2(resource->size); |
| resource->gran = resource->align; |
| resource->flags = IORESOURCE_IO; |
| resource->limit = 0xffff; |
| } |
| else { |
| /* A Memory mapped base address */ |
| type = size & (~PCI_BASE_ADDRESS_MEM_MASK); |
| resource->size = (~(size &PCI_BASE_ADDRESS_MEM_MASK)) +1; |
| resource->align = log2(resource->size); |
| resource->gran = resource->align; |
| resource->flags = IORESOURCE_MEM; |
| if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) { |
| resource->flags |= IORESOURCE_PREFETCH; |
| } |
| type &= PCI_BASE_ADDRESS_MEM_TYPE_MASK; |
| if (type == PCI_BASE_ADDRESS_MEM_TYPE_32) { |
| /* 32bit limit */ |
| resource->limit = 0xffffffffUL; |
| } |
| else if (type == PCI_BASE_ADDRESS_MEM_TYPE_1M) { |
| /* 1MB limit */ |
| resource->limit = 0x000fffffUL; |
| } |
| else if (type == PCI_BASE_ADDRESS_MEM_TYPE_64) { |
| unsigned long index_hi; |
| /* 64bit limit |
| * For now just treat this as a 32bit limit |
| */ |
| index_hi = index + 4; |
| resource->limit = 0xffffffffUL; |
| resource->flags |= IORESOURCE_PCI64; |
| pci_read_config_dword( dev, index_hi, &addr); |
| /* get the extended size */ |
| pci_write_config_dword(dev, index_hi, 0xffffffffUL); |
| pci_read_config_dword( dev, index_hi, &size); |
| |
| /* get the minimum value the bar can be set to */ |
| pci_write_config_dword(dev, index_hi, 0); |
| pci_read_config_dword(dev, index_hi, &base); |
| |
| /* restore addr */ |
| pci_write_config_dword(dev, index_hi, addr); |
| |
| if ((size == 0xffffffff) && (base == 0)) { |
| /* Clear the top half of the bar */ |
| pci_write_config_dword(dev, index_hi, 0); |
| } |
| else { |
| printk_err("PCI: %02x:%02x.%01x Unable to handle 64-bit address\n", |
| dev->bus->secondary, |
| PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); |
| resource->flags = IORESOURCE_PCI64; |
| } |
| } |
| else { |
| /* Invalid value */ |
| resource->flags = 0; |
| } |
| } |
| /* dev->size holds the flags... */ |
| return; |
| } |
| |
| /** Read the base address registers for a given device. |
| * @param dev Pointer to the dev structure |
| * @param howmany How many registers to read (6 for device, 2 for bridge) |
| */ |
| static void pci_read_bases(struct device *dev, unsigned int howmany) |
| { |
| unsigned int reg; |
| unsigned long index; |
| |
| reg = dev->resources; |
| for(index = PCI_BASE_ADDRESS_0; |
| (reg < MAX_RESOURCES) && (index < PCI_BASE_ADDRESS_0 + (howmany << 2)); ) { |
| struct resource *resource; |
| resource = &dev->resource[reg]; |
| pci_get_resource(dev, resource, index); |
| reg += (resource->flags & (IORESOURCE_IO | IORESOURCE_MEM))? 1:0; |
| index += (resource->flags & IORESOURCE_PCI64)?8:4; |
| } |
| dev->resources = reg; |
| } |
| |
| |
| static void pci_bridge_read_bases(struct device *dev) |
| { |
| unsigned int reg = dev->resources; |
| |
| /* FIXME handle bridges without some of the optional resources */ |
| |
| /* Initialize the io space constraints on the current bus */ |
| dev->resource[reg].base = 0; |
| dev->resource[reg].size = 0; |
| dev->resource[reg].align = log2(PCI_IO_BRIDGE_ALIGN); |
| dev->resource[reg].gran = log2(PCI_IO_BRIDGE_ALIGN); |
| dev->resource[reg].limit = 0xffffUL; |
| dev->resource[reg].flags = IORESOURCE_IO | IORESOURCE_PCI_BRIDGE; |
| dev->resource[reg].index = PCI_IO_BASE; |
| compute_allocate_resource(dev, &dev->resource[reg], |
| IORESOURCE_IO, IORESOURCE_IO); |
| reg++; |
| |
| /* Initiliaze the prefetchable memory constraints on the current bus */ |
| dev->resource[reg].base = 0; |
| dev->resource[reg].size = 0; |
| dev->resource[reg].align = log2(PCI_MEM_BRIDGE_ALIGN); |
| dev->resource[reg].gran = log2(PCI_MEM_BRIDGE_ALIGN); |
| dev->resource[reg].limit = 0xffffffffUL; |
| dev->resource[reg].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_PCI_BRIDGE; |
| dev->resource[reg].index = PCI_PREF_MEMORY_BASE; |
| compute_allocate_resource(dev, &dev->resource[reg], |
| IORESOURCE_MEM | IORESOURCE_PREFETCH, |
| IORESOURCE_MEM | IORESOURCE_PREFETCH); |
| reg++; |
| |
| /* Initialize the memory resources on the current bus */ |
| dev->resource[reg].base = 0; |
| dev->resource[reg].size = 0; |
| dev->resource[reg].align = log2(PCI_MEM_BRIDGE_ALIGN); |
| dev->resource[reg].gran = log2(PCI_MEM_BRIDGE_ALIGN); |
| dev->resource[reg].limit = 0xffffffffUL; |
| dev->resource[reg].flags = IORESOURCE_MEM | IORESOURCE_PCI_BRIDGE; |
| dev->resource[reg].index = PCI_MEMORY_BASE; |
| compute_allocate_resource(dev, &dev->resource[reg], |
| IORESOURCE_MEM | IORESOURCE_PREFETCH, |
| IORESOURCE_MEM); |
| reg++; |
| |
| dev->resources = reg; |
| } |
| |
| |
| void pci_dev_read_resources(struct device *dev) |
| { |
| uint32_t addr; |
| dev->resources = 0; |
| memset(&dev->resource[0], 0, sizeof(dev->resource)); |
| pci_read_bases(dev, 6); |
| pci_read_config_dword(dev, PCI_ROM_ADDRESS, &addr); |
| dev->rom_address = (addr == 0xffffffff)? 0 : addr; |
| } |
| |
| void pci_bus_read_resources(struct device *dev) |
| { |
| uint32_t addr; |
| dev->resources = 0; |
| memset(&dev->resource[0], 0, sizeof(dev->resource)); |
| pci_bridge_read_bases(dev); |
| pci_read_bases(dev, 2); |
| |
| pci_read_config_dword(dev, PCI_ROM_ADDRESS1, &addr); |
| dev->rom_address = (addr == 0xffffffff)? 0 : addr; |
| |
| } |
| |
| |
| static void pci_set_resource(struct device *dev, struct resource *resource) |
| { |
| unsigned long base, limit; |
| unsigned long bridge_align = PCI_MEM_BRIDGE_ALIGN; |
| unsigned char buf[10]; |
| |
| /* Make certain the resource has actually been set */ |
| if (!(resource->flags & IORESOURCE_SET)) { |
| #if 1 |
| printk_err("ERROR: %02x:%02x.%01x %02x not allocated\n", |
| dev->bus->secondary, |
| PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
| resource->index); |
| #endif |
| return; |
| } |
| |
| /* Only handle PCI memory and IO resources for now */ |
| if (!(resource->flags & (IORESOURCE_MEM |IORESOURCE_IO))) |
| return; |
| |
| if (resource->flags & IORESOURCE_MEM) { |
| dev->command |= PCI_COMMAND_MEMORY; |
| bridge_align = PCI_MEM_BRIDGE_ALIGN; |
| } |
| if (resource->flags & IORESOURCE_IO) { |
| dev->command |= PCI_COMMAND_IO; |
| bridge_align = PCI_IO_BRIDGE_ALIGN; |
| } |
| if (resource->flags & IORESOURCE_PCI_BRIDGE) { |
| dev->command |= PCI_COMMAND_MASTER; |
| } |
| /* Get the base address */ |
| base = resource->base; |
| |
| /* Get the limit (rounded up) */ |
| limit = base + ((resource->size + bridge_align - 1UL) & ~(bridge_align -1)) -1UL; |
| |
| if (!(resource->flags & IORESOURCE_PCI_BRIDGE)) { |
| /* |
| * some chipsets allow us to set/clear the IO bit. |
| * (e.g. VIA 82c686a.) So set it to be safe) |
| */ |
| limit = base + resource->size -1; |
| if (resource->flags & IORESOURCE_IO) { |
| base |= PCI_BASE_ADDRESS_SPACE_IO; |
| } |
| pci_write_config_dword(dev, resource->index, base & 0xffffffff); |
| if (resource->flags & IORESOURCE_PCI64) { |
| /* FIXME handle real 64bit base addresses */ |
| pci_write_config_dword(dev, resource->index + 4, 0); |
| } |
| } |
| else if (resource->index == PCI_IO_BASE) { |
| /* set the IO ranges |
| * WARNING: we don't really do 32-bit addressing for IO yet! |
| */ |
| compute_allocate_resource(dev, resource, |
| IORESOURCE_IO, IORESOURCE_IO); |
| pci_write_config_byte(dev, PCI_IO_BASE, base >> 8); |
| pci_write_config_byte(dev, PCI_IO_LIMIT, limit >> 8); |
| } |
| else if (resource->index == PCI_MEMORY_BASE) { |
| /* set the memory range |
| */ |
| compute_allocate_resource(dev, resource, |
| IORESOURCE_MEM | IORESOURCE_PREFETCH, |
| IORESOURCE_MEM); |
| pci_write_config_word(dev, PCI_MEMORY_BASE, base >> 16); |
| pci_write_config_word(dev, PCI_MEMORY_LIMIT, limit >> 16); |
| } |
| else if (resource->index == PCI_PREF_MEMORY_BASE) { |
| /* set the prefetchable memory range |
| * WARNING: we don't really do 64-bit addressing for prefetchable memory yet! |
| */ |
| compute_allocate_resource(dev, resource, |
| IORESOURCE_MEM | IORESOURCE_PREFETCH, |
| IORESOURCE_MEM | IORESOURCE_PREFETCH); |
| pci_write_config_word(dev, PCI_PREF_MEMORY_BASE, base >> 16); |
| pci_write_config_word(dev, PCI_PREF_MEMORY_LIMIT, limit >> 16); |
| } |
| else { |
| printk_err("ERROR: invalid resource->index %x\n", |
| resource->index); |
| } |
| buf[0] = '\0'; |
| if (resource->flags & IORESOURCE_PCI_BRIDGE) { |
| sprintf(buf, "bus %d ", dev->secondary); |
| } |
| |
| printk_debug( |
| "PCI: %02x:%02x.%01x %02x <- [0x%08lx - 0x%08lx] %s%s\n", |
| dev->bus->secondary, |
| PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
| resource->index, |
| resource->base, limit, |
| buf, |
| (resource->flags & IORESOURCE_IO)? "io": |
| (resource->flags & IORESOURCE_PREFETCH)? "prefmem": "mem"); |
| return; |
| } |
| |
| void pci_dev_set_resources(struct device *dev) |
| { |
| struct resource *resource, *last; |
| uint8_t line; |
| |
| last = &dev->resource[dev->resources]; |
| |
| for(resource = &dev->resource[0]; resource < last; resource++) { |
| pci_set_resource(dev, resource); |
| } |
| if (dev->children) { |
| assign_resources(dev); |
| } |
| |
| /* set a default latency timer */ |
| pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x40); |
| |
| /* set a default secondary latency timer */ |
| if ((dev->hdr_type & 0x7f) == PCI_HEADER_TYPE_BRIDGE) { |
| pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 0x40); |
| } |
| |
| /* zero the irq settings */ |
| pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &line); |
| if (line) { |
| pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 0); |
| } |
| /* set the cache line size, so far 64 bytes is good for everyone */ |
| pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 64 >> 2); |
| } |
| |
| struct device_operations default_pci_ops_dev = { |
| .read_resources = pci_dev_read_resources, |
| .set_resources = pci_dev_set_resources, |
| .init = 0, |
| .scan_bus = 0, |
| }; |
| struct device_operations default_pci_ops_bus = { |
| .read_resources = pci_bus_read_resources, |
| .set_resources = pci_dev_set_resources, |
| .init = 0, |
| .scan_bus = pci_scan_bridge, |
| }; |
| static void set_pci_ops(struct device *dev) |
| { |
| struct pci_driver *driver; |
| if (dev->ops) { |
| return; |
| } |
| /* Look through the list of setup drivers and find one for |
| * this pci device |
| */ |
| for(driver = &pci_drivers[0]; driver != &epci_drivers[0]; driver++) { |
| if ((driver->vendor == dev->vendor) && |
| (driver->device == dev->device)) { |
| dev->ops = driver->ops; |
| #if 1 |
| printk_debug("PCI: %02x:%02x.%01x [%04x/%04x] ops\n", |
| dev->bus->secondary, |
| PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
| driver->vendor, driver->device |
| ); |
| #endif |
| return; |
| } |
| } |
| /* If I don't have a specific driver use the default operations */ |
| switch(dev->hdr_type & 0x7f) { /* header type */ |
| case PCI_HEADER_TYPE_NORMAL: /* standard header */ |
| if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) |
| goto bad; |
| dev->ops = &default_pci_ops_dev; |
| break; |
| case PCI_HEADER_TYPE_BRIDGE: |
| if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI) |
| goto bad; |
| dev->ops = &default_pci_ops_bus; |
| break; |
| default: |
| bad: |
| printk_err("PCI: %02x:%02x.%01x [%04x/%04x/%06x] has unknown header " |
| "type %02x, ignoring.\n", |
| dev->bus->secondary, |
| PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
| dev->vendor, dev->device, |
| dev->class >> 8, dev->hdr_type); |
| } |
| return; |
| } |
| |
| /** |
| * Given a bus and a devfn number, find the device structure |
| * @param bus The bus structure |
| * @param devfn a device/function number |
| * @return pointer to the device structure |
| */ |
| static struct device *pci_scan_get_dev(struct device **list, unsigned int devfn) |
| { |
| struct device *dev = 0; |
| for(; *list; list = &(*list)->sibling) { |
| if ((*list)->devfn == devfn) { |
| /* Unlink from the list */ |
| dev = *list; |
| *list = (*list)->sibling; |
| dev->sibling = 0; |
| break; |
| } |
| } |
| return dev; |
| } |
| |
| |
| #define HYPERTRANSPORT_SUPPORT 1 |
| /** Scan the pci bus devices and bridges. |
| * @param pci_bus pointer to the bus structure |
| * @param max current bus number |
| * @return The maximum bus number found, after scanning all subordinate busses |
| */ |
| unsigned int pci_scan_bus(struct device *bus, unsigned int max) |
| { |
| unsigned int devfn; |
| struct device *dev, **bus_last; |
| struct device *old_devices; |
| struct device *child; |
| #if HYPERTRANSPORT_SUPPORT |
| unsigned next_unitid, last_unitid; |
| #endif |
| |
| printk_debug("PCI: pci_scan_bus for bus %d\n", bus->secondary); |
| |
| old_devices = bus->children; |
| bus->children = 0; |
| bus_last = &bus->children; |
| |
| post_code(0x24); |
| |
| |
| #if HYPERTRANSPORT_SUPPORT |
| /* If present assign unitid to a hypertransport chain */ |
| next_unitid = 1; |
| do { |
| struct device dummy; |
| uint32_t id; |
| uint8_t hdr_type, pos; |
| last_unitid = next_unitid; |
| |
| dummy.bus = bus; |
| dummy.devfn = 0; |
| pci_read_config_dword(&dummy, PCI_VENDOR_ID, &id); |
| if (id == 0xffffffff || id == 0x00000000 || |
| id == 0x0000ffff || id == 0xffff0000) { |
| break; |
| } |
| pci_read_config_byte(&dummy, PCI_HEADER_TYPE, &hdr_type); |
| pos = 0; |
| switch(hdr_type & 0x7f) { |
| case PCI_HEADER_TYPE_NORMAL: |
| case PCI_HEADER_TYPE_BRIDGE: |
| pos = PCI_CAPABILITY_LIST; |
| break; |
| } |
| if (pos > PCI_CAP_LIST_NEXT) { |
| pci_read_config_byte(&dummy, pos, &pos); |
| } |
| while(pos != 0) { |
| uint8_t cap; |
| pci_read_config_byte(&dummy, pos + PCI_CAP_LIST_ID, &cap); |
| printk_debug("Capability: 0x%02x @ 0x%02x\n", cap, pos); |
| if (cap == PCI_CAP_ID_HT) { |
| uint16_t flags; |
| pci_read_config_word(&dummy, pos + PCI_CAP_FLAGS, &flags); |
| printk_debug("flags: 0x%04x\n", (unsigned)flags); |
| if ((flags >> 13) == 0) { |
| unsigned count; |
| flags &= ~0x1f; |
| flags |= next_unitid & 0x1f; |
| count = (flags >> 5) & 0x1f; |
| printk_debug("unitid: 0x%02x, count: 0x%02x\n", |
| next_unitid, count); |
| pci_write_config_word(&dummy, pos + PCI_CAP_FLAGS, flags); |
| next_unitid += count; |
| break; |
| } |
| } |
| pci_read_config_byte(&dummy, pos + PCI_CAP_LIST_NEXT, &pos); |
| } |
| } while((last_unitid != next_unitid) && (next_unitid <= 0x1f)); |
| #endif /* HYPERTRANSPORT_SUPPORT */ |
| |
| /* probe all devices on this bus with some optimization for non-existance and |
| single funcion devices */ |
| for (devfn = 0; devfn <= 0xff; devfn++) { |
| struct device dummy; |
| uint32_t id, class; |
| uint8_t cmd, tmp, hdr_type; |
| |
| /* First thing setup the device structure */ |
| dev = pci_scan_get_dev(&old_devices, devfn); |
| |
| dummy.bus = bus; |
| dummy.devfn = devfn; |
| pci_read_config_dword(&dummy, PCI_VENDOR_ID, &id); |
| /* some broken boards return 0 if a slot is empty: */ |
| if (!dev && |
| (id == 0xffffffff || id == 0x00000000 || |
| id == 0x0000ffff || id == 0xffff0000)) { |
| printk_spew("PCI: devfn 0x%x, bad id 0x%x\n", devfn, id); |
| if (PCI_FUNC(devfn) == 0x00) { |
| /* if this is a function 0 device and it is not present, |
| skip to next device */ |
| devfn += 0x07; |
| } |
| /* multi function device, skip to next function */ |
| continue; |
| } |
| pci_read_config_byte(&dummy, PCI_HEADER_TYPE, &hdr_type); |
| pci_read_config_dword(&dummy, PCI_CLASS_REVISION, &class); |
| |
| if (!dev) { |
| if ((dev = malloc(sizeof(*dev))) == 0) { |
| printk_err("PCI: out of memory.\n"); |
| continue; |
| } |
| memset(dev, 0, sizeof(*dev)); |
| } |
| |
| dev->bus = bus; |
| dev->devfn = devfn; |
| dev->vendor = id & 0xffff; |
| dev->device = (id >> 16) & 0xffff; |
| dev->hdr_type = hdr_type; |
| /* class code, the upper 3 bytes of PCI_CLASS_REVISION */ |
| dev->class = class >> 8; |
| |
| /* non-destructively determine if device can be a master: */ |
| pci_read_config_byte(dev, PCI_COMMAND, &cmd); |
| pci_write_config_byte(dev, PCI_COMMAND, cmd | PCI_COMMAND_MASTER); |
| pci_read_config_byte(dev, PCI_COMMAND, &tmp); |
| |
| dev->master = ((tmp & PCI_COMMAND_MASTER) != 0); |
| pci_write_config_byte(dev, PCI_COMMAND, cmd); |
| |
| /* Look at the vendor and device id, or at least the |
| * header type and class and figure out which set of configuration |
| * methods to use. |
| */ |
| set_pci_ops(dev); |
| /* Kill the device if we don't have some pci operations for it */ |
| if (!dev->ops) { |
| free(dev); |
| continue; |
| } |
| printk_debug("PCI: %02x:%02x.%01x [%04x/%04x]\n", |
| bus->secondary, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), |
| dev->vendor, dev->device); |
| |
| /* Put it into the global device chain. */ |
| append_device(dev); |
| |
| /* Now insert it into the list of devices held by the parent bus. */ |
| *bus_last = dev; |
| bus_last = &dev->sibling; |
| |
| if (PCI_FUNC(devfn) == 0x00 && (hdr_type & 0x80) != 0x80) { |
| /* if this is not a multi function device, don't waste time probe |
| another function. Skip to next device. */ |
| devfn += 0x07; |
| } |
| } |
| post_code(0x25); |
| |
| for(child = bus->children; child; child = child->sibling) { |
| if (!child->ops->scan_bus) |
| continue; |
| max = child->ops->scan_bus(child, max); |
| |
| } |
| /* |
| * We've scanned the bus and so we know all about what's on |
| * the other side of any bridges that may be on this bus plus |
| * any devices. |
| * |
| * Return how far we've got finding sub-buses. |
| */ |
| printk_debug("PCI: pci_scan_bus returning with max=%02x\n", max); |
| post_code(0x55); |
| return max; |
| } |
| |
| /** Scan the bus, first for bridges and next for devices. |
| * @param pci_bus pointer to the bus structure |
| * @return The maximum bus number found, after scanning all subordinate busses |
| */ |
| unsigned int pci_scan_bridge(struct device *bus, unsigned int max) |
| { |
| uint32_t buses; |
| uint16_t cr; |
| /* Set up the primary, secondary and subordinate bus numbers. We have |
| * no idea how many buses are behind this bridge yet, so we set the |
| * subordinate bus number to 0xff for the moment |
| */ |
| bus->secondary = ++max; |
| bus->subordinate = 0xff; |
| |
| /* Clear all status bits and turn off memory, I/O and master enables. */ |
| pci_read_config_word(bus, PCI_COMMAND, &cr); |
| pci_write_config_word(bus, PCI_COMMAND, 0x0000); |
| pci_write_config_word(bus, PCI_STATUS, 0xffff); |
| |
| /* |
| * Read the existing primary/secondary/subordinate bus |
| * number configuration. |
| */ |
| pci_read_config_dword(bus, PCI_PRIMARY_BUS, &buses); |
| |
| /* Configure the bus numbers for this bridge: the configuration |
| * transactions will not be propagated by the bridge if it is not |
| * correctly configured |
| */ |
| buses &= 0xff000000; |
| buses |= (((unsigned int) (bus->bus->secondary) << 0) | |
| ((unsigned int) (bus->secondary) << 8) | |
| ((unsigned int) (bus->subordinate) << 16)); |
| pci_write_config_dword(bus, PCI_PRIMARY_BUS, buses); |
| |
| /* Now we can scan all subordinate buses i.e. the bus hehind the bridge */ |
| max = pci_scan_bus(bus, max); |
| |
| /* We know the number of buses behind this bridge. Set the subordinate |
| * bus number to its real value |
| */ |
| bus->subordinate = max; |
| buses = (buses & 0xff00ffff) | |
| ((unsigned int) (bus->subordinate) << 16); |
| pci_write_config_dword(bus, PCI_PRIMARY_BUS, buses); |
| pci_write_config_word(bus, PCI_COMMAND, cr); |
| |
| return max; |
| } |
| |
| |
| static void pci_root_read_resources(struct device *bus) |
| { |
| int res = 0; |
| /* Initialize the system wide io space constraints */ |
| bus->resource[res].base = 0x400; |
| bus->resource[res].size = 0; |
| bus->resource[res].align = 0; |
| bus->resource[res].gran = 0; |
| bus->resource[res].limit = 0xffffUL; |
| bus->resource[res].flags = IORESOURCE_IO; |
| bus->resource[res].index = PCI_IO_BASE; |
| compute_allocate_resource(bus, &bus->resource[res], |
| IORESOURCE_IO, IORESOURCE_IO); |
| res++; |
| |
| /* Initialize the system wide memory resources constraints */ |
| bus->resource[res].base = 0; |
| bus->resource[res].size = 0; |
| bus->resource[res].align = 0; |
| bus->resource[res].gran = 0; |
| bus->resource[res].limit = 0xffffffffUL; |
| bus->resource[res].flags = IORESOURCE_MEM; |
| bus->resource[res].index = PCI_MEMORY_BASE; |
| compute_allocate_resource(bus, &bus->resource[res], |
| IORESOURCE_MEM, IORESOURCE_MEM); |
| res++; |
| |
| bus->resources = res; |
| } |
| static void pci_root_set_resources(struct device *bus) |
| { |
| compute_allocate_resource(bus, |
| &bus->resource[0], IORESOURCE_IO, IORESOURCE_IO); |
| compute_allocate_resource(bus, |
| &bus->resource[1], IORESOURCE_MEM, IORESOURCE_MEM); |
| assign_resources(bus); |
| } |
| |
| struct device_operations default_pci_ops_root = { |
| .read_resources = pci_root_read_resources, |
| .set_resources = pci_root_set_resources, |
| .init = 0, |
| .scan_bus = pci_scan_bus, |
| }; |
| |