diff options
Diffstat (limited to 'arch/i386/pci/mmconfig.c')
| -rw-r--r-- | arch/i386/pci/mmconfig.c | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c deleted file mode 100644 index 4bb4d4b0f73..00000000000 --- a/arch/i386/pci/mmconfig.c +++ /dev/null @@ -1,185 +0,0 @@ -/* - * Copyright (C) 2004 Matthew Wilcox <matthew@wil.cx> - * Copyright (C) 2004 Intel Corp. - * - * This code is released under the GNU General Public License version 2. - */ - -/* - * mmconfig.c - Low-level direct PCI config space access via MMCONFIG - */ - -#include <linux/pci.h> -#include <linux/init.h> -#include <linux/acpi.h> -#include "pci.h" - -#define mmcfg_virt_addr ((void __iomem *) fix_to_virt(FIX_PCIE_MCFG)) - -/* The base address of the last MMCONFIG device accessed */ -static u32 mmcfg_last_accessed_device; - -static DECLARE_BITMAP(fallback_slots, 32); - -/* - * Functions for accessing PCI configuration space with MMCONFIG accesses - */ -static u32 get_base_addr(unsigned int seg, int bus, unsigned devfn) -{ - int cfg_num = -1; - struct acpi_table_mcfg_config *cfg; - - if (seg == 0 && bus == 0 && - test_bit(PCI_SLOT(devfn), fallback_slots)) - return 0; - - while (1) { - ++cfg_num; - if (cfg_num >= pci_mmcfg_config_num) { - /* Not found - fallback to type 1 */ - return 0; - } - cfg = &pci_mmcfg_config[cfg_num]; - if (cfg->pci_segment_group_number != seg) - continue; - if ((cfg->start_bus_number <= bus) && - (cfg->end_bus_number >= bus)) - return cfg->base_address; - } -} - -static inline void pci_exp_set_dev_base(unsigned int base, int bus, int devfn) -{ - u32 dev_base = base | (bus << 20) | (devfn << 12); - if (dev_base != mmcfg_last_accessed_device) { - mmcfg_last_accessed_device = dev_base; - set_fixmap_nocache(FIX_PCIE_MCFG, dev_base); - } -} - -static int pci_mmcfg_read(unsigned int seg, unsigned int bus, - unsigned int devfn, int reg, int len, u32 *value) -{ - unsigned long flags; - u32 base; - - if (!value || (bus > 255) || (devfn > 255) || (reg > 4095)) - return -EINVAL; - - base = get_base_addr(seg, bus, devfn); - if (!base) - return pci_conf1_read(seg,bus,devfn,reg,len,value); - - spin_lock_irqsave(&pci_config_lock, flags); - - pci_exp_set_dev_base(base, bus, devfn); - - switch (len) { - case 1: - *value = readb(mmcfg_virt_addr + reg); - break; - case 2: - *value = readw(mmcfg_virt_addr + reg); - break; - case 4: - *value = readl(mmcfg_virt_addr + reg); - break; - } - - spin_unlock_irqrestore(&pci_config_lock, flags); - - return 0; -} - -static int pci_mmcfg_write(unsigned int seg, unsigned int bus, - unsigned int devfn, int reg, int len, u32 value) -{ - unsigned long flags; - u32 base; - - if ((bus > 255) || (devfn > 255) || (reg > 4095)) - return -EINVAL; - - base = get_base_addr(seg, bus, devfn); - if (!base) - return pci_conf1_write(seg,bus,devfn,reg,len,value); - - spin_lock_irqsave(&pci_config_lock, flags); - - pci_exp_set_dev_base(base, bus, devfn); - - switch (len) { - case 1: - writeb(value, mmcfg_virt_addr + reg); - break; - case 2: - writew(value, mmcfg_virt_addr + reg); - break; - case 4: - writel(value, mmcfg_virt_addr + reg); - break; - } - - spin_unlock_irqrestore(&pci_config_lock, flags); - - return 0; -} - -static struct pci_raw_ops pci_mmcfg = { - .read = pci_mmcfg_read, - .write = pci_mmcfg_write, -}; - -/* K8 systems have some devices (typically in the builtin northbridge) - that are only accessible using type1 - Normally this can be expressed in the MCFG by not listing them - and assigning suitable _SEGs, but this isn't implemented in some BIOS. - Instead try to discover all devices on bus 0 that are unreachable using MM - and fallback for them. - We only do this for bus 0/seg 0 */ -static __init void unreachable_devices(void) -{ - int i; - unsigned long flags; - - for (i = 0; i < 32; i++) { - u32 val1; - u32 addr; - - pci_conf1_read(0, 0, PCI_DEVFN(i, 0), 0, 4, &val1); - if (val1 == 0xffffffff) - continue; - - /* Locking probably not needed, but safer */ - spin_lock_irqsave(&pci_config_lock, flags); - addr = get_base_addr(0, 0, PCI_DEVFN(i, 0)); - if (addr != 0) - pci_exp_set_dev_base(addr, 0, PCI_DEVFN(i, 0)); - if (addr == 0 || readl((u32 __iomem *)mmcfg_virt_addr) != val1) - set_bit(i, fallback_slots); - spin_unlock_irqrestore(&pci_config_lock, flags); - } -} - -static int __init pci_mmcfg_init(void) -{ - if ((pci_probe & PCI_PROBE_MMCONF) == 0) - goto out; - - acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg); - if ((pci_mmcfg_config_num == 0) || - (pci_mmcfg_config == NULL) || - (pci_mmcfg_config[0].base_address == 0)) - goto out; - - printk(KERN_INFO "PCI: Using MMCONFIG\n"); - raw_pci_ops = &pci_mmcfg; - pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF; - - unreachable_devices(); - - out: - return 0; -} - -arch_initcall(pci_mmcfg_init); |