diff options
Diffstat (limited to 'arch/alpha/kernel/pci.c')
-rw-r--r-- | arch/alpha/kernel/pci.c | 561 |
1 files changed, 561 insertions, 0 deletions
diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c new file mode 100644 index 0000000..1f36bbd --- /dev/null +++ b/arch/alpha/kernel/pci.c @@ -0,0 +1,561 @@ +/* + * 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/config.h> +#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 <linux/module.h> +#include <linux/cache.h> +#include <linux/slab.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"; + +/* Indicate whether we respect the PCI setup left by console. */ +/* + * Make this long-lived so that we know when shutting down + * whether we probed only or not. + */ +int pci_probe_only; + +/* + * The PCI controller list. + */ + +struct pci_controller *hose_head, **hose_tail = &hose_head; +struct pci_controller *pci_isa_hose; + +/* + * Quirks. + */ + +static void __init +quirk_isa_bridge(struct pci_dev *dev) +{ + dev->class = PCI_CLASS_BRIDGE_ISA << 8; +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82378, quirk_isa_bridge); + +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 the entire 0xfff00000-0xffffffff region. */ + else if (dev->class >> 8 == PCI_CLASS_BRIDGE_ISA) { + if (__direct_map_base + __direct_map_size >= 0xfff00000UL) + __direct_map_size = 0xfff00000UL - __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 >= 0xfff00000UL) + pci->size = 0xfff00000UL - pci->dma_base; + } + } +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, quirk_cypress); + +/* Called for each device after PCI setup is done. */ +static void __init +pcibios_fixup_final(struct pci_dev *dev) +{ + unsigned int class = dev->class >> 8; + + if (class == PCI_CLASS_BRIDGE_ISA || class == PCI_CLASS_BRIDGE_EISA) { + dev->dma_mask = MAX_ISA_DMA_ADDRESS - 1; + isa_bridge = dev; + } +} +DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_final); + +/* Just declaring that the power-of-ten prefixes are actually the + power-of-two ones doesn't make it true :) */ +#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(0x1000UL, 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 KB +#undef MB +#undef GB + +static int __init +pcibios_init(void) +{ + if (alpha_mv.init_pci) + alpha_mv.init_pci(); + return 0; +} + +subsys_initcall(pcibios_init); + +char * __init +pcibios_setup(char *str) +{ + return str; +} + +#ifdef ALPHA_RESTORE_SRM_SETUP +static struct pdev_srm_saved_conf *srm_saved_configs; + +void __init +pdev_save_srm_config(struct pci_dev *dev) +{ + struct pdev_srm_saved_conf *tmp; + static int printed = 0; + + if (!alpha_using_srm || pci_probe_only) + return; + + if (!printed) { + printk(KERN_INFO "pci: enabling save/restore of SRM state\n"); + printed = 1; + } + + tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); + if (!tmp) { + printk(KERN_ERR "%s: kmalloc() failed!\n", __FUNCTION__); + return; + } + tmp->next = srm_saved_configs; + tmp->dev = dev; + + pci_save_state(dev); + + srm_saved_configs = tmp; +} + +void +pci_restore_srm_config(void) +{ + struct pdev_srm_saved_conf *tmp; + + /* No need to restore if probed only. */ + if (pci_probe_only) + return; + + /* Restore SRM config. */ + for (tmp = srm_saved_configs; tmp; tmp = tmp->next) { + pci_restore_state(tmp->dev); + } +} +#endif + +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) +{ + /* Propagate hose info into the subordinate devices. */ + + struct pci_controller *hose = bus->sysdata; + struct pci_dev *dev = bus->self; + + if (!dev) { + /* Root bus. */ + u32 pci_mem_end; + u32 sg_base = hose->sg_pci ? hose->sg_pci->dma_base : ~0; + unsigned long end; + + bus->resource[0] = hose->io_space; + bus->resource[1] = hose->mem_space; + + /* Adjust hose mem_space limit to prevent PCI allocations + in the iommu windows. */ + pci_mem_end = min((u32)__direct_map_base, sg_base) - 1; + end = hose->mem_space->start + pci_mem_end; + if (hose->mem_space->end > end) + hose->mem_space->end = end; + } else if (pci_probe_only && + (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { + pci_read_bridge_bases(bus); + pcibios_fixup_device_resources(dev, bus); + } + + list_for_each_entry(dev, &bus->devices, bus_list) { + pdev_save_srm_config(dev); + 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); +} + +/* Most Alphas have straight-forward swizzling needs. */ + +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); +} + +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_space->start; + else if (res->flags & IORESOURCE_MEM) + offset = hose->mem_space->start; + + region->start = res->start - offset; + region->end = res->end - offset; +} + +#ifdef CONFIG_HOTPLUG +EXPORT_SYMBOL(pcibios_resource_to_bus); +#endif + +int +pcibios_enable_device(struct pci_dev *dev, int mask) +{ + u16 cmd, oldcmd; + int i; + + pci_read_config_word(dev, PCI_COMMAND, &cmd); + oldcmd = cmd; + + for (i = 0; i < PCI_NUM_RESOURCES; i++) { + struct resource *res = &dev->resource[i]; + + if (res->flags & IORESOURCE_IO) + cmd |= PCI_COMMAND_IO; + else if (res->flags & IORESOURCE_MEM) + cmd |= PCI_COMMAND_MEMORY; + } + + if (cmd != oldcmd) { + printk(KERN_DEBUG "PCI: Enabling device: (%s), cmd %x\n", + pci_name(dev), cmd); + /* Enable the appropriate bits in the PCI command register. */ + 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 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 64\n", + pci_name(dev)); + pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64); +} + +static void __init +pcibios_claim_one_bus(struct pci_bus *b) +{ + struct pci_dev *dev; + struct pci_bus *child_bus; + + list_for_each_entry(dev, &b->devices, bus_list) { + int i; + + for (i = 0; i < PCI_NUM_RESOURCES; i++) { + struct resource *r = &dev->resource[i]; + + if (r->parent || !r->start || !r->flags) + continue; + pci_claim_resource(dev, i); + } + } + + list_for_each_entry(child_bus, &b->children, node) + pcibios_claim_one_bus(child_bus); +} + +static void __init +pcibios_claim_console_setup(void) +{ + struct pci_bus *b; + + list_for_each_entry(b, &pci_root_buses, node) + pcibios_claim_one_bus(b); +} + +void __init +common_init_pci(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) { + bus = pci_scan_bus(next_busno, alpha_mv.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; + } + } + + if (pci_probe_only) + pcibios_claim_console_setup(); + + 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; +} + +/* Create an __iomem token from a PCI BAR. Copied from lib/iomap.c with + no changes, since we don't want the other things in that object file. */ + +void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) +{ + unsigned long start = pci_resource_start(dev, bar); + unsigned long len = pci_resource_len(dev, bar); + unsigned long flags = pci_resource_flags(dev, bar); + + if (!len || !start) + return NULL; + if (maxlen && len > maxlen) + len = maxlen; + if (flags & IORESOURCE_IO) + return ioport_map(start, len); + if (flags & IORESOURCE_MEM) { + /* Not checking IORESOURCE_CACHEABLE because alpha does + not distinguish between ioremap and ioremap_nocache. */ + return ioremap(start, len); + } + return NULL; +} + +/* Destroy that token. Not copied from lib/iomap.c. */ + +void pci_iounmap(struct pci_dev *dev, void __iomem * addr) +{ + if (__is_mmio(addr)) + iounmap(addr); +} + +EXPORT_SYMBOL(pci_iomap); +EXPORT_SYMBOL(pci_iounmap); |