1284 lines
34 KiB
C
1284 lines
34 KiB
C
/*
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* probe.c - PCI detection and setup code
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*/
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/cpumask.h>
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#include "pci.h"
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#define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
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#define CARDBUS_RESERVE_BUSNR 3
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#define PCI_CFG_SPACE_SIZE 256
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#define PCI_CFG_SPACE_EXP_SIZE 4096
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/* Ugh. Need to stop exporting this to modules. */
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LIST_HEAD(pci_root_buses);
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EXPORT_SYMBOL(pci_root_buses);
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LIST_HEAD(pci_devices);
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/*
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* Some device drivers need know if pci is initiated.
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* Basically, we think pci is not initiated when there
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* is no device in list of pci_devices.
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*/
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int no_pci_devices(void)
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{
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return list_empty(&pci_devices);
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}
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EXPORT_SYMBOL(no_pci_devices);
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#ifdef HAVE_PCI_LEGACY
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/**
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* pci_create_legacy_files - create legacy I/O port and memory files
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* @b: bus to create files under
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*
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* Some platforms allow access to legacy I/O port and ISA memory space on
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* a per-bus basis. This routine creates the files and ties them into
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* their associated read, write and mmap files from pci-sysfs.c
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*/
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static void pci_create_legacy_files(struct pci_bus *b)
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{
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b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
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GFP_ATOMIC);
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if (b->legacy_io) {
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b->legacy_io->attr.name = "legacy_io";
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b->legacy_io->size = 0xffff;
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b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
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b->legacy_io->read = pci_read_legacy_io;
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b->legacy_io->write = pci_write_legacy_io;
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class_device_create_bin_file(&b->class_dev, b->legacy_io);
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/* Allocated above after the legacy_io struct */
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b->legacy_mem = b->legacy_io + 1;
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b->legacy_mem->attr.name = "legacy_mem";
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b->legacy_mem->size = 1024*1024;
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b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
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b->legacy_mem->mmap = pci_mmap_legacy_mem;
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class_device_create_bin_file(&b->class_dev, b->legacy_mem);
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}
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}
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void pci_remove_legacy_files(struct pci_bus *b)
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{
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if (b->legacy_io) {
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class_device_remove_bin_file(&b->class_dev, b->legacy_io);
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class_device_remove_bin_file(&b->class_dev, b->legacy_mem);
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kfree(b->legacy_io); /* both are allocated here */
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}
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}
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#else /* !HAVE_PCI_LEGACY */
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static inline void pci_create_legacy_files(struct pci_bus *bus) { return; }
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void pci_remove_legacy_files(struct pci_bus *bus) { return; }
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#endif /* HAVE_PCI_LEGACY */
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/*
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* PCI Bus Class Devices
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*/
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static ssize_t pci_bus_show_cpuaffinity(struct class_device *class_dev,
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char *buf)
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{
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int ret;
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cpumask_t cpumask;
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cpumask = pcibus_to_cpumask(to_pci_bus(class_dev));
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ret = cpumask_scnprintf(buf, PAGE_SIZE, cpumask);
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if (ret < PAGE_SIZE)
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buf[ret++] = '\n';
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return ret;
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}
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CLASS_DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpuaffinity, NULL);
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/*
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* PCI Bus Class
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*/
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static void release_pcibus_dev(struct class_device *class_dev)
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{
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struct pci_bus *pci_bus = to_pci_bus(class_dev);
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if (pci_bus->bridge)
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put_device(pci_bus->bridge);
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kfree(pci_bus);
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}
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static struct class pcibus_class = {
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.name = "pci_bus",
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.release = &release_pcibus_dev,
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};
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static int __init pcibus_class_init(void)
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{
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return class_register(&pcibus_class);
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}
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postcore_initcall(pcibus_class_init);
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/*
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* Translate the low bits of the PCI base
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* to the resource type
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*/
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static inline unsigned int pci_calc_resource_flags(unsigned int flags)
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{
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if (flags & PCI_BASE_ADDRESS_SPACE_IO)
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return IORESOURCE_IO;
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if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
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return IORESOURCE_MEM | IORESOURCE_PREFETCH;
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return IORESOURCE_MEM;
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}
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/*
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* Find the extent of a PCI decode..
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*/
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static u32 pci_size(u32 base, u32 maxbase, u32 mask)
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{
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u32 size = mask & maxbase; /* Find the significant bits */
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if (!size)
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return 0;
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/* Get the lowest of them to find the decode size, and
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from that the extent. */
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size = (size & ~(size-1)) - 1;
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/* base == maxbase can be valid only if the BAR has
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already been programmed with all 1s. */
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if (base == maxbase && ((base | size) & mask) != mask)
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return 0;
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return size;
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}
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static u64 pci_size64(u64 base, u64 maxbase, u64 mask)
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{
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u64 size = mask & maxbase; /* Find the significant bits */
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if (!size)
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return 0;
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/* Get the lowest of them to find the decode size, and
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from that the extent. */
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size = (size & ~(size-1)) - 1;
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/* base == maxbase can be valid only if the BAR has
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already been programmed with all 1s. */
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if (base == maxbase && ((base | size) & mask) != mask)
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return 0;
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return size;
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}
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static inline int is_64bit_memory(u32 mask)
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{
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if ((mask & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
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(PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64))
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return 1;
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return 0;
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}
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static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
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{
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unsigned int pos, reg, next;
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u32 l, sz;
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struct resource *res;
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for(pos=0; pos<howmany; pos = next) {
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u64 l64;
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u64 sz64;
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u32 raw_sz;
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next = pos+1;
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res = &dev->resource[pos];
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res->name = pci_name(dev);
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reg = PCI_BASE_ADDRESS_0 + (pos << 2);
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pci_read_config_dword(dev, reg, &l);
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pci_write_config_dword(dev, reg, ~0);
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pci_read_config_dword(dev, reg, &sz);
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pci_write_config_dword(dev, reg, l);
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if (!sz || sz == 0xffffffff)
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continue;
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if (l == 0xffffffff)
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l = 0;
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raw_sz = sz;
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if ((l & PCI_BASE_ADDRESS_SPACE) ==
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PCI_BASE_ADDRESS_SPACE_MEMORY) {
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sz = pci_size(l, sz, (u32)PCI_BASE_ADDRESS_MEM_MASK);
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/*
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* For 64bit prefetchable memory sz could be 0, if the
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* real size is bigger than 4G, so we need to check
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* szhi for that.
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*/
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if (!is_64bit_memory(l) && !sz)
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continue;
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res->start = l & PCI_BASE_ADDRESS_MEM_MASK;
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res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK;
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} else {
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sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff);
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if (!sz)
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continue;
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res->start = l & PCI_BASE_ADDRESS_IO_MASK;
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res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
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}
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res->end = res->start + (unsigned long) sz;
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res->flags |= pci_calc_resource_flags(l);
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if (is_64bit_memory(l)) {
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u32 szhi, lhi;
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pci_read_config_dword(dev, reg+4, &lhi);
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pci_write_config_dword(dev, reg+4, ~0);
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pci_read_config_dword(dev, reg+4, &szhi);
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pci_write_config_dword(dev, reg+4, lhi);
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sz64 = ((u64)szhi << 32) | raw_sz;
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l64 = ((u64)lhi << 32) | l;
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sz64 = pci_size64(l64, sz64, PCI_BASE_ADDRESS_MEM_MASK);
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next++;
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#if BITS_PER_LONG == 64
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if (!sz64) {
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res->start = 0;
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res->end = 0;
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res->flags = 0;
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continue;
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}
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res->start = l64 & PCI_BASE_ADDRESS_MEM_MASK;
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res->end = res->start + sz64;
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#else
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if (sz64 > 0x100000000ULL) {
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printk(KERN_ERR "PCI: Unable to handle 64-bit "
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"BAR for device %s\n", pci_name(dev));
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res->start = 0;
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res->flags = 0;
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} else if (lhi) {
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/* 64-bit wide address, treat as disabled */
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pci_write_config_dword(dev, reg,
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l & ~(u32)PCI_BASE_ADDRESS_MEM_MASK);
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pci_write_config_dword(dev, reg+4, 0);
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res->start = 0;
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res->end = sz;
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}
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#endif
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}
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}
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if (rom) {
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dev->rom_base_reg = rom;
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res = &dev->resource[PCI_ROM_RESOURCE];
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res->name = pci_name(dev);
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pci_read_config_dword(dev, rom, &l);
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pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE);
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pci_read_config_dword(dev, rom, &sz);
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pci_write_config_dword(dev, rom, l);
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if (l == 0xffffffff)
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l = 0;
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if (sz && sz != 0xffffffff) {
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sz = pci_size(l, sz, (u32)PCI_ROM_ADDRESS_MASK);
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if (sz) {
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res->flags = (l & IORESOURCE_ROM_ENABLE) |
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IORESOURCE_MEM | IORESOURCE_READONLY;
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res->start = l & PCI_ROM_ADDRESS_MASK;
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res->end = res->start + (unsigned long) sz;
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}
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}
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}
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}
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void pci_read_bridge_bases(struct pci_bus *child)
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{
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struct pci_dev *dev = child->self;
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u8 io_base_lo, io_limit_lo;
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u16 mem_base_lo, mem_limit_lo;
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unsigned long base, limit;
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struct resource *res;
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int i;
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if (!dev) /* It's a host bus, nothing to read */
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return;
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if (dev->transparent) {
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printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev));
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for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
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child->resource[i] = child->parent->resource[i - 3];
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}
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for(i=0; i<3; i++)
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child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
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res = child->resource[0];
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pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
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pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
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base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
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limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
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if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
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u16 io_base_hi, io_limit_hi;
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pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
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pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
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base |= (io_base_hi << 16);
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limit |= (io_limit_hi << 16);
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}
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if (base <= limit) {
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res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
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if (!res->start)
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res->start = base;
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if (!res->end)
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res->end = limit + 0xfff;
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}
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res = child->resource[1];
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pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
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pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
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base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
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limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
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if (base <= limit) {
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res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
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res->start = base;
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res->end = limit + 0xfffff;
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}
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res = child->resource[2];
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pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
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pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
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base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
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limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
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if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
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u32 mem_base_hi, mem_limit_hi;
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pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
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pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
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/*
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* Some bridges set the base > limit by default, and some
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* (broken) BIOSes do not initialize them. If we find
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* this, just assume they are not being used.
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*/
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if (mem_base_hi <= mem_limit_hi) {
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#if BITS_PER_LONG == 64
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base |= ((long) mem_base_hi) << 32;
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limit |= ((long) mem_limit_hi) << 32;
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#else
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if (mem_base_hi || mem_limit_hi) {
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printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev));
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return;
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}
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#endif
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}
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}
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if (base <= limit) {
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res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
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res->start = base;
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res->end = limit + 0xfffff;
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}
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}
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static struct pci_bus * pci_alloc_bus(void)
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{
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struct pci_bus *b;
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b = kzalloc(sizeof(*b), GFP_KERNEL);
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if (b) {
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INIT_LIST_HEAD(&b->node);
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INIT_LIST_HEAD(&b->children);
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INIT_LIST_HEAD(&b->devices);
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}
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return b;
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}
|
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|
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static struct pci_bus * __devinit
|
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pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr)
|
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{
|
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struct pci_bus *child;
|
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int i;
|
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int retval;
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|
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/*
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* Allocate a new bus, and inherit stuff from the parent..
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*/
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child = pci_alloc_bus();
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if (!child)
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return NULL;
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|
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child->self = bridge;
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child->parent = parent;
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child->ops = parent->ops;
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child->sysdata = parent->sysdata;
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child->bus_flags = parent->bus_flags;
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child->bridge = get_device(&bridge->dev);
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|
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child->class_dev.class = &pcibus_class;
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sprintf(child->class_dev.class_id, "%04x:%02x", pci_domain_nr(child), busnr);
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retval = class_device_register(&child->class_dev);
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if (retval)
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goto error_register;
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retval = class_device_create_file(&child->class_dev,
|
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&class_device_attr_cpuaffinity);
|
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if (retval)
|
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goto error_file_create;
|
|
|
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/*
|
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* Set up the primary, secondary and subordinate
|
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* bus numbers.
|
|
*/
|
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child->number = child->secondary = busnr;
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child->primary = parent->secondary;
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child->subordinate = 0xff;
|
|
|
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/* Set up default resource pointers and names.. */
|
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for (i = 0; i < 4; i++) {
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child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
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child->resource[i]->name = child->name;
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}
|
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bridge->subordinate = child;
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|
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return child;
|
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|
|
error_file_create:
|
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class_device_unregister(&child->class_dev);
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error_register:
|
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kfree(child);
|
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return NULL;
|
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}
|
|
|
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struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
|
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{
|
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struct pci_bus *child;
|
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|
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child = pci_alloc_child_bus(parent, dev, busnr);
|
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if (child) {
|
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down_write(&pci_bus_sem);
|
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list_add_tail(&child->node, &parent->children);
|
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up_write(&pci_bus_sem);
|
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}
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return child;
|
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}
|
|
|
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static void pci_enable_crs(struct pci_dev *dev)
|
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{
|
|
u16 cap, rpctl;
|
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int rpcap = pci_find_capability(dev, PCI_CAP_ID_EXP);
|
|
if (!rpcap)
|
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return;
|
|
|
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pci_read_config_word(dev, rpcap + PCI_CAP_FLAGS, &cap);
|
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if (((cap & PCI_EXP_FLAGS_TYPE) >> 4) != PCI_EXP_TYPE_ROOT_PORT)
|
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return;
|
|
|
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pci_read_config_word(dev, rpcap + PCI_EXP_RTCTL, &rpctl);
|
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rpctl |= PCI_EXP_RTCTL_CRSSVE;
|
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pci_write_config_word(dev, rpcap + PCI_EXP_RTCTL, rpctl);
|
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}
|
|
|
|
static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
|
|
{
|
|
struct pci_bus *parent = child->parent;
|
|
|
|
/* Attempts to fix that up are really dangerous unless
|
|
we're going to re-assign all bus numbers. */
|
|
if (!pcibios_assign_all_busses())
|
|
return;
|
|
|
|
while (parent->parent && parent->subordinate < max) {
|
|
parent->subordinate = max;
|
|
pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
|
|
parent = parent->parent;
|
|
}
|
|
}
|
|
|
|
unsigned int pci_scan_child_bus(struct pci_bus *bus);
|
|
|
|
/*
|
|
* If it's a bridge, configure it and scan the bus behind it.
|
|
* For CardBus bridges, we don't scan behind as the devices will
|
|
* be handled by the bridge driver itself.
|
|
*
|
|
* We need to process bridges in two passes -- first we scan those
|
|
* already configured by the BIOS and after we are done with all of
|
|
* them, we proceed to assigning numbers to the remaining buses in
|
|
* order to avoid overlaps between old and new bus numbers.
|
|
*/
|
|
int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass)
|
|
{
|
|
struct pci_bus *child;
|
|
int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
|
|
u32 buses, i, j = 0;
|
|
u16 bctl;
|
|
|
|
pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
|
|
|
|
pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n",
|
|
pci_name(dev), buses & 0xffffff, pass);
|
|
|
|
/* Disable MasterAbortMode during probing to avoid reporting
|
|
of bus errors (in some architectures) */
|
|
pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
|
|
pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
|
|
bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
|
|
|
|
pci_enable_crs(dev);
|
|
|
|
if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
|
|
unsigned int cmax, busnr;
|
|
/*
|
|
* Bus already configured by firmware, process it in the first
|
|
* pass and just note the configuration.
|
|
*/
|
|
if (pass)
|
|
goto out;
|
|
busnr = (buses >> 8) & 0xFF;
|
|
|
|
/*
|
|
* If we already got to this bus through a different bridge,
|
|
* ignore it. This can happen with the i450NX chipset.
|
|
*/
|
|
if (pci_find_bus(pci_domain_nr(bus), busnr)) {
|
|
printk(KERN_INFO "PCI: Bus %04x:%02x already known\n",
|
|
pci_domain_nr(bus), busnr);
|
|
goto out;
|
|
}
|
|
|
|
child = pci_add_new_bus(bus, dev, busnr);
|
|
if (!child)
|
|
goto out;
|
|
child->primary = buses & 0xFF;
|
|
child->subordinate = (buses >> 16) & 0xFF;
|
|
child->bridge_ctl = bctl ^ PCI_BRIDGE_CTL_NO_ISA;
|
|
|
|
cmax = pci_scan_child_bus(child);
|
|
if (cmax > max)
|
|
max = cmax;
|
|
if (child->subordinate > max)
|
|
max = child->subordinate;
|
|
} else {
|
|
/*
|
|
* We need to assign a number to this bus which we always
|
|
* do in the second pass.
|
|
*/
|
|
if (!pass) {
|
|
if (pcibios_assign_all_busses())
|
|
/* Temporarily disable forwarding of the
|
|
configuration cycles on all bridges in
|
|
this bus segment to avoid possible
|
|
conflicts in the second pass between two
|
|
bridges programmed with overlapping
|
|
bus ranges. */
|
|
pci_write_config_dword(dev, PCI_PRIMARY_BUS,
|
|
buses & ~0xffffff);
|
|
goto out;
|
|
}
|
|
|
|
/* Clear errors */
|
|
pci_write_config_word(dev, PCI_STATUS, 0xffff);
|
|
|
|
/* Prevent assigning a bus number that already exists.
|
|
* This can happen when a bridge is hot-plugged */
|
|
if (pci_find_bus(pci_domain_nr(bus), max+1))
|
|
goto out;
|
|
child = pci_add_new_bus(bus, dev, ++max);
|
|
buses = (buses & 0xff000000)
|
|
| ((unsigned int)(child->primary) << 0)
|
|
| ((unsigned int)(child->secondary) << 8)
|
|
| ((unsigned int)(child->subordinate) << 16);
|
|
|
|
/*
|
|
* yenta.c forces a secondary latency timer of 176.
|
|
* Copy that behaviour here.
|
|
*/
|
|
if (is_cardbus) {
|
|
buses &= ~0xff000000;
|
|
buses |= CARDBUS_LATENCY_TIMER << 24;
|
|
}
|
|
|
|
/*
|
|
* We need to blast all three values with a single write.
|
|
*/
|
|
pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
|
|
|
|
if (!is_cardbus) {
|
|
child->bridge_ctl = bctl ^ PCI_BRIDGE_CTL_NO_ISA;
|
|
/*
|
|
* Adjust subordinate busnr in parent buses.
|
|
* We do this before scanning for children because
|
|
* some devices may not be detected if the bios
|
|
* was lazy.
|
|
*/
|
|
pci_fixup_parent_subordinate_busnr(child, max);
|
|
/* Now we can scan all subordinate buses... */
|
|
max = pci_scan_child_bus(child);
|
|
/*
|
|
* now fix it up again since we have found
|
|
* the real value of max.
|
|
*/
|
|
pci_fixup_parent_subordinate_busnr(child, max);
|
|
} else {
|
|
/*
|
|
* For CardBus bridges, we leave 4 bus numbers
|
|
* as cards with a PCI-to-PCI bridge can be
|
|
* inserted later.
|
|
*/
|
|
for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
|
|
struct pci_bus *parent = bus;
|
|
if (pci_find_bus(pci_domain_nr(bus),
|
|
max+i+1))
|
|
break;
|
|
while (parent->parent) {
|
|
if ((!pcibios_assign_all_busses()) &&
|
|
(parent->subordinate > max) &&
|
|
(parent->subordinate <= max+i)) {
|
|
j = 1;
|
|
}
|
|
parent = parent->parent;
|
|
}
|
|
if (j) {
|
|
/*
|
|
* Often, there are two cardbus bridges
|
|
* -- try to leave one valid bus number
|
|
* for each one.
|
|
*/
|
|
i /= 2;
|
|
break;
|
|
}
|
|
}
|
|
max += i;
|
|
pci_fixup_parent_subordinate_busnr(child, max);
|
|
}
|
|
/*
|
|
* Set the subordinate bus number to its real value.
|
|
*/
|
|
child->subordinate = max;
|
|
pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
|
|
}
|
|
|
|
sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number);
|
|
|
|
/* Has only triggered on CardBus, fixup is in yenta_socket */
|
|
while (bus->parent) {
|
|
if ((child->subordinate > bus->subordinate) ||
|
|
(child->number > bus->subordinate) ||
|
|
(child->number < bus->number) ||
|
|
(child->subordinate < bus->number)) {
|
|
pr_debug("PCI: Bus #%02x (-#%02x) is %s"
|
|
"hidden behind%s bridge #%02x (-#%02x)\n",
|
|
child->number, child->subordinate,
|
|
(bus->number > child->subordinate &&
|
|
bus->subordinate < child->number) ?
|
|
"wholly " : " partially",
|
|
bus->self->transparent ? " transparent" : " ",
|
|
bus->number, bus->subordinate);
|
|
}
|
|
bus = bus->parent;
|
|
}
|
|
|
|
out:
|
|
pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
|
|
|
|
return max;
|
|
}
|
|
|
|
/*
|
|
* Read interrupt line and base address registers.
|
|
* The architecture-dependent code can tweak these, of course.
|
|
*/
|
|
static void pci_read_irq(struct pci_dev *dev)
|
|
{
|
|
unsigned char irq;
|
|
|
|
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
|
|
dev->pin = irq;
|
|
if (irq)
|
|
pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
|
|
dev->irq = irq;
|
|
}
|
|
|
|
#define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
|
|
|
|
/**
|
|
* pci_setup_device - fill in class and map information of a device
|
|
* @dev: the device structure to fill
|
|
*
|
|
* Initialize the device structure with information about the device's
|
|
* vendor,class,memory and IO-space addresses,IRQ lines etc.
|
|
* Called at initialisation of the PCI subsystem and by CardBus services.
|
|
* Returns 0 on success and -1 if unknown type of device (not normal, bridge
|
|
* or CardBus).
|
|
*/
|
|
static int pci_setup_device(struct pci_dev * dev)
|
|
{
|
|
u32 class;
|
|
|
|
sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
|
|
dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
|
|
|
|
pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
|
|
dev->revision = class & 0xff;
|
|
class >>= 8; /* upper 3 bytes */
|
|
dev->class = class;
|
|
class >>= 8;
|
|
|
|
pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev),
|
|
dev->vendor, dev->device, class, dev->hdr_type);
|
|
|
|
/* "Unknown power state" */
|
|
dev->current_state = PCI_UNKNOWN;
|
|
|
|
/* Early fixups, before probing the BARs */
|
|
pci_fixup_device(pci_fixup_early, dev);
|
|
class = dev->class >> 8;
|
|
|
|
switch (dev->hdr_type) { /* header type */
|
|
case PCI_HEADER_TYPE_NORMAL: /* standard header */
|
|
if (class == PCI_CLASS_BRIDGE_PCI)
|
|
goto bad;
|
|
pci_read_irq(dev);
|
|
pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
|
|
pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
|
|
pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
|
|
|
|
/*
|
|
* Do the ugly legacy mode stuff here rather than broken chip
|
|
* quirk code. Legacy mode ATA controllers have fixed
|
|
* addresses. These are not always echoed in BAR0-3, and
|
|
* BAR0-3 in a few cases contain junk!
|
|
*/
|
|
if (class == PCI_CLASS_STORAGE_IDE) {
|
|
u8 progif;
|
|
struct pci_bus_region region;
|
|
|
|
pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
|
|
if ((progif & 1) == 0) {
|
|
struct resource resource = {
|
|
.start = 0x1F0,
|
|
.end = 0x1F7,
|
|
.flags = LEGACY_IO_RESOURCE,
|
|
};
|
|
|
|
pcibios_resource_to_bus(dev, ®ion, &resource);
|
|
dev->resource[0].start = region.start;
|
|
dev->resource[0].end = region.end;
|
|
dev->resource[0].flags = resource.flags;
|
|
resource.start = 0x3F6;
|
|
resource.end = 0x3F6;
|
|
resource.flags = LEGACY_IO_RESOURCE;
|
|
pcibios_resource_to_bus(dev, ®ion, &resource);
|
|
dev->resource[1].start = region.start;
|
|
dev->resource[1].end = region.end;
|
|
dev->resource[1].flags = resource.flags;
|
|
}
|
|
if ((progif & 4) == 0) {
|
|
struct resource resource = {
|
|
.start = 0x170,
|
|
.end = 0x177,
|
|
.flags = LEGACY_IO_RESOURCE,
|
|
};
|
|
|
|
pcibios_resource_to_bus(dev, ®ion, &resource);
|
|
dev->resource[2].start = region.start;
|
|
dev->resource[2].end = region.end;
|
|
dev->resource[2].flags = resource.flags;
|
|
resource.start = 0x376;
|
|
resource.end = 0x376;
|
|
resource.flags = LEGACY_IO_RESOURCE;
|
|
pcibios_resource_to_bus(dev, ®ion, &resource);
|
|
dev->resource[3].start = region.start;
|
|
dev->resource[3].end = region.end;
|
|
dev->resource[3].flags = resource.flags;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
|
|
if (class != PCI_CLASS_BRIDGE_PCI)
|
|
goto bad;
|
|
/* The PCI-to-PCI bridge spec requires that subtractive
|
|
decoding (i.e. transparent) bridge must have programming
|
|
interface code of 0x01. */
|
|
pci_read_irq(dev);
|
|
dev->transparent = ((dev->class & 0xff) == 1);
|
|
pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
|
|
break;
|
|
|
|
case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
|
|
if (class != PCI_CLASS_BRIDGE_CARDBUS)
|
|
goto bad;
|
|
pci_read_irq(dev);
|
|
pci_read_bases(dev, 1, 0);
|
|
pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
|
|
pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
|
|
break;
|
|
|
|
default: /* unknown header */
|
|
printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n",
|
|
pci_name(dev), dev->hdr_type);
|
|
return -1;
|
|
|
|
bad:
|
|
printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n",
|
|
pci_name(dev), class, dev->hdr_type);
|
|
dev->class = PCI_CLASS_NOT_DEFINED;
|
|
}
|
|
|
|
/* We found a fine healthy device, go go go... */
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_release_dev - free a pci device structure when all users of it are finished.
|
|
* @dev: device that's been disconnected
|
|
*
|
|
* Will be called only by the device core when all users of this pci device are
|
|
* done.
|
|
*/
|
|
static void pci_release_dev(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev;
|
|
|
|
pci_dev = to_pci_dev(dev);
|
|
kfree(pci_dev);
|
|
}
|
|
|
|
/**
|
|
* pci_cfg_space_size - get the configuration space size of the PCI device.
|
|
* @dev: PCI device
|
|
*
|
|
* Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
|
|
* have 4096 bytes. Even if the device is capable, that doesn't mean we can
|
|
* access it. Maybe we don't have a way to generate extended config space
|
|
* accesses, or the device is behind a reverse Express bridge. So we try
|
|
* reading the dword at 0x100 which must either be 0 or a valid extended
|
|
* capability header.
|
|
*/
|
|
int pci_cfg_space_size(struct pci_dev *dev)
|
|
{
|
|
int pos;
|
|
u32 status;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
|
|
if (!pos) {
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
|
|
if (!pos)
|
|
goto fail;
|
|
|
|
pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
|
|
if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
|
|
goto fail;
|
|
}
|
|
|
|
if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
|
|
goto fail;
|
|
if (status == 0xffffffff)
|
|
goto fail;
|
|
|
|
return PCI_CFG_SPACE_EXP_SIZE;
|
|
|
|
fail:
|
|
return PCI_CFG_SPACE_SIZE;
|
|
}
|
|
|
|
static void pci_release_bus_bridge_dev(struct device *dev)
|
|
{
|
|
kfree(dev);
|
|
}
|
|
|
|
struct pci_dev *alloc_pci_dev(void)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&dev->global_list);
|
|
INIT_LIST_HEAD(&dev->bus_list);
|
|
|
|
pci_msi_init_pci_dev(dev);
|
|
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL(alloc_pci_dev);
|
|
|
|
/*
|
|
* Read the config data for a PCI device, sanity-check it
|
|
* and fill in the dev structure...
|
|
*/
|
|
static struct pci_dev * __devinit
|
|
pci_scan_device(struct pci_bus *bus, int devfn)
|
|
{
|
|
struct pci_dev *dev;
|
|
u32 l;
|
|
u8 hdr_type;
|
|
int delay = 1;
|
|
|
|
if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
|
|
return NULL;
|
|
|
|
/* some broken boards return 0 or ~0 if a slot is empty: */
|
|
if (l == 0xffffffff || l == 0x00000000 ||
|
|
l == 0x0000ffff || l == 0xffff0000)
|
|
return NULL;
|
|
|
|
/* Configuration request Retry Status */
|
|
while (l == 0xffff0001) {
|
|
msleep(delay);
|
|
delay *= 2;
|
|
if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
|
|
return NULL;
|
|
/* Card hasn't responded in 60 seconds? Must be stuck. */
|
|
if (delay > 60 * 1000) {
|
|
printk(KERN_WARNING "Device %04x:%02x:%02x.%d not "
|
|
"responding\n", pci_domain_nr(bus),
|
|
bus->number, PCI_SLOT(devfn),
|
|
PCI_FUNC(devfn));
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
|
|
return NULL;
|
|
|
|
dev = alloc_pci_dev();
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
dev->bus = bus;
|
|
dev->sysdata = bus->sysdata;
|
|
dev->dev.parent = bus->bridge;
|
|
dev->dev.bus = &pci_bus_type;
|
|
dev->devfn = devfn;
|
|
dev->hdr_type = hdr_type & 0x7f;
|
|
dev->multifunction = !!(hdr_type & 0x80);
|
|
dev->vendor = l & 0xffff;
|
|
dev->device = (l >> 16) & 0xffff;
|
|
dev->cfg_size = pci_cfg_space_size(dev);
|
|
dev->error_state = pci_channel_io_normal;
|
|
|
|
/* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
|
|
set this higher, assuming the system even supports it. */
|
|
dev->dma_mask = 0xffffffff;
|
|
if (pci_setup_device(dev) < 0) {
|
|
kfree(dev);
|
|
return NULL;
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
|
|
void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
|
|
{
|
|
device_initialize(&dev->dev);
|
|
dev->dev.release = pci_release_dev;
|
|
pci_dev_get(dev);
|
|
|
|
set_dev_node(&dev->dev, pcibus_to_node(bus));
|
|
dev->dev.dma_mask = &dev->dma_mask;
|
|
dev->dev.coherent_dma_mask = 0xffffffffull;
|
|
|
|
/* Fix up broken headers */
|
|
pci_fixup_device(pci_fixup_header, dev);
|
|
|
|
/*
|
|
* Add the device to our list of discovered devices
|
|
* and the bus list for fixup functions, etc.
|
|
*/
|
|
INIT_LIST_HEAD(&dev->global_list);
|
|
down_write(&pci_bus_sem);
|
|
list_add_tail(&dev->bus_list, &bus->devices);
|
|
up_write(&pci_bus_sem);
|
|
}
|
|
|
|
struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
dev = pci_scan_device(bus, devfn);
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
pci_device_add(dev, bus);
|
|
|
|
return dev;
|
|
}
|
|
|
|
/**
|
|
* pci_scan_slot - scan a PCI slot on a bus for devices.
|
|
* @bus: PCI bus to scan
|
|
* @devfn: slot number to scan (must have zero function.)
|
|
*
|
|
* Scan a PCI slot on the specified PCI bus for devices, adding
|
|
* discovered devices to the @bus->devices list. New devices
|
|
* will have an empty dev->global_list head.
|
|
*/
|
|
int pci_scan_slot(struct pci_bus *bus, int devfn)
|
|
{
|
|
int func, nr = 0;
|
|
int scan_all_fns;
|
|
|
|
scan_all_fns = pcibios_scan_all_fns(bus, devfn);
|
|
|
|
for (func = 0; func < 8; func++, devfn++) {
|
|
struct pci_dev *dev;
|
|
|
|
dev = pci_scan_single_device(bus, devfn);
|
|
if (dev) {
|
|
nr++;
|
|
|
|
/*
|
|
* If this is a single function device,
|
|
* don't scan past the first function.
|
|
*/
|
|
if (!dev->multifunction) {
|
|
if (func > 0) {
|
|
dev->multifunction = 1;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
if (func == 0 && !scan_all_fns)
|
|
break;
|
|
}
|
|
}
|
|
return nr;
|
|
}
|
|
|
|
unsigned int pci_scan_child_bus(struct pci_bus *bus)
|
|
{
|
|
unsigned int devfn, pass, max = bus->secondary;
|
|
struct pci_dev *dev;
|
|
|
|
pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
|
|
|
|
/* Go find them, Rover! */
|
|
for (devfn = 0; devfn < 0x100; devfn += 8)
|
|
pci_scan_slot(bus, devfn);
|
|
|
|
/*
|
|
* After performing arch-dependent fixup of the bus, look behind
|
|
* all PCI-to-PCI bridges on this bus.
|
|
*/
|
|
pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
|
|
pcibios_fixup_bus(bus);
|
|
for (pass=0; pass < 2; pass++)
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
|
|
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
|
|
max = pci_scan_bridge(bus, dev, max, pass);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
|
|
pci_domain_nr(bus), bus->number, max);
|
|
return max;
|
|
}
|
|
|
|
unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
|
|
{
|
|
unsigned int max;
|
|
|
|
max = pci_scan_child_bus(bus);
|
|
|
|
/*
|
|
* Make the discovered devices available.
|
|
*/
|
|
pci_bus_add_devices(bus);
|
|
|
|
return max;
|
|
}
|
|
|
|
struct pci_bus * pci_create_bus(struct device *parent,
|
|
int bus, struct pci_ops *ops, void *sysdata)
|
|
{
|
|
int error;
|
|
struct pci_bus *b;
|
|
struct device *dev;
|
|
|
|
b = pci_alloc_bus();
|
|
if (!b)
|
|
return NULL;
|
|
|
|
dev = kmalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev){
|
|
kfree(b);
|
|
return NULL;
|
|
}
|
|
|
|
b->sysdata = sysdata;
|
|
b->ops = ops;
|
|
|
|
if (pci_find_bus(pci_domain_nr(b), bus)) {
|
|
/* If we already got to this bus through a different bridge, ignore it */
|
|
pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
|
|
goto err_out;
|
|
}
|
|
|
|
down_write(&pci_bus_sem);
|
|
list_add_tail(&b->node, &pci_root_buses);
|
|
up_write(&pci_bus_sem);
|
|
|
|
memset(dev, 0, sizeof(*dev));
|
|
dev->parent = parent;
|
|
dev->release = pci_release_bus_bridge_dev;
|
|
sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
|
|
error = device_register(dev);
|
|
if (error)
|
|
goto dev_reg_err;
|
|
b->bridge = get_device(dev);
|
|
|
|
b->class_dev.class = &pcibus_class;
|
|
sprintf(b->class_dev.class_id, "%04x:%02x", pci_domain_nr(b), bus);
|
|
error = class_device_register(&b->class_dev);
|
|
if (error)
|
|
goto class_dev_reg_err;
|
|
error = class_device_create_file(&b->class_dev, &class_device_attr_cpuaffinity);
|
|
if (error)
|
|
goto class_dev_create_file_err;
|
|
|
|
/* Create legacy_io and legacy_mem files for this bus */
|
|
pci_create_legacy_files(b);
|
|
|
|
error = sysfs_create_link(&b->class_dev.kobj, &b->bridge->kobj, "bridge");
|
|
if (error)
|
|
goto sys_create_link_err;
|
|
|
|
b->number = b->secondary = bus;
|
|
b->resource[0] = &ioport_resource;
|
|
b->resource[1] = &iomem_resource;
|
|
|
|
return b;
|
|
|
|
sys_create_link_err:
|
|
class_device_remove_file(&b->class_dev, &class_device_attr_cpuaffinity);
|
|
class_dev_create_file_err:
|
|
class_device_unregister(&b->class_dev);
|
|
class_dev_reg_err:
|
|
device_unregister(dev);
|
|
dev_reg_err:
|
|
down_write(&pci_bus_sem);
|
|
list_del(&b->node);
|
|
up_write(&pci_bus_sem);
|
|
err_out:
|
|
kfree(dev);
|
|
kfree(b);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_create_bus);
|
|
|
|
struct pci_bus *pci_scan_bus_parented(struct device *parent,
|
|
int bus, struct pci_ops *ops, void *sysdata)
|
|
{
|
|
struct pci_bus *b;
|
|
|
|
b = pci_create_bus(parent, bus, ops, sysdata);
|
|
if (b)
|
|
b->subordinate = pci_scan_child_bus(b);
|
|
return b;
|
|
}
|
|
EXPORT_SYMBOL(pci_scan_bus_parented);
|
|
|
|
#ifdef CONFIG_HOTPLUG
|
|
EXPORT_SYMBOL(pci_add_new_bus);
|
|
EXPORT_SYMBOL(pci_do_scan_bus);
|
|
EXPORT_SYMBOL(pci_scan_slot);
|
|
EXPORT_SYMBOL(pci_scan_bridge);
|
|
EXPORT_SYMBOL(pci_scan_single_device);
|
|
EXPORT_SYMBOL_GPL(pci_scan_child_bus);
|
|
#endif
|
|
|
|
static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b)
|
|
{
|
|
if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
|
|
else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
|
|
|
|
if (a->bus->number < b->bus->number) return -1;
|
|
else if (a->bus->number > b->bus->number) return 1;
|
|
|
|
if (a->devfn < b->devfn) return -1;
|
|
else if (a->devfn > b->devfn) return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Yes, this forcably breaks the klist abstraction temporarily. It
|
|
* just wants to sort the klist, not change reference counts and
|
|
* take/drop locks rapidly in the process. It does all this while
|
|
* holding the lock for the list, so objects can't otherwise be
|
|
* added/removed while we're swizzling.
|
|
*/
|
|
static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list)
|
|
{
|
|
struct list_head *pos;
|
|
struct klist_node *n;
|
|
struct device *dev;
|
|
struct pci_dev *b;
|
|
|
|
list_for_each(pos, list) {
|
|
n = container_of(pos, struct klist_node, n_node);
|
|
dev = container_of(n, struct device, knode_bus);
|
|
b = to_pci_dev(dev);
|
|
if (pci_sort_bf_cmp(a, b) <= 0) {
|
|
list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node);
|
|
return;
|
|
}
|
|
}
|
|
list_move_tail(&a->dev.knode_bus.n_node, list);
|
|
}
|
|
|
|
static void __init pci_sort_breadthfirst_klist(void)
|
|
{
|
|
LIST_HEAD(sorted_devices);
|
|
struct list_head *pos, *tmp;
|
|
struct klist_node *n;
|
|
struct device *dev;
|
|
struct pci_dev *pdev;
|
|
|
|
spin_lock(&pci_bus_type.klist_devices.k_lock);
|
|
list_for_each_safe(pos, tmp, &pci_bus_type.klist_devices.k_list) {
|
|
n = container_of(pos, struct klist_node, n_node);
|
|
dev = container_of(n, struct device, knode_bus);
|
|
pdev = to_pci_dev(dev);
|
|
pci_insertion_sort_klist(pdev, &sorted_devices);
|
|
}
|
|
list_splice(&sorted_devices, &pci_bus_type.klist_devices.k_list);
|
|
spin_unlock(&pci_bus_type.klist_devices.k_lock);
|
|
}
|
|
|
|
static void __init pci_insertion_sort_devices(struct pci_dev *a, struct list_head *list)
|
|
{
|
|
struct pci_dev *b;
|
|
|
|
list_for_each_entry(b, list, global_list) {
|
|
if (pci_sort_bf_cmp(a, b) <= 0) {
|
|
list_move_tail(&a->global_list, &b->global_list);
|
|
return;
|
|
}
|
|
}
|
|
list_move_tail(&a->global_list, list);
|
|
}
|
|
|
|
static void __init pci_sort_breadthfirst_devices(void)
|
|
{
|
|
LIST_HEAD(sorted_devices);
|
|
struct pci_dev *dev, *tmp;
|
|
|
|
down_write(&pci_bus_sem);
|
|
list_for_each_entry_safe(dev, tmp, &pci_devices, global_list) {
|
|
pci_insertion_sort_devices(dev, &sorted_devices);
|
|
}
|
|
list_splice(&sorted_devices, &pci_devices);
|
|
up_write(&pci_bus_sem);
|
|
}
|
|
|
|
void __init pci_sort_breadthfirst(void)
|
|
{
|
|
pci_sort_breadthfirst_devices();
|
|
pci_sort_breadthfirst_klist();
|
|
}
|
|
|