diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/pci/Makefile | 2 | ||||
| -rw-r--r-- | arch/i386/pci/early.c | 44 | ||||
| -rw-r--r-- | arch/x86_64/pci/Makefile | 3 |
3 files changed, 47 insertions, 2 deletions
diff --git a/arch/i386/pci/Makefile b/arch/i386/pci/Makefile index 62ad75c57e6..1594d2f55c8 100644 --- a/arch/i386/pci/Makefile +++ b/arch/i386/pci/Makefile @@ -11,4 +11,4 @@ pci-y += legacy.o irq.o pci-$(CONFIG_X86_VISWS) := visws.o fixup.o pci-$(CONFIG_X86_NUMAQ) := numa.o irq.o -obj-y += $(pci-y) common.o +obj-y += $(pci-y) common.o early.o diff --git a/arch/i386/pci/early.c b/arch/i386/pci/early.c new file mode 100644 index 00000000000..b1f7f40d809 --- /dev/null +++ b/arch/i386/pci/early.c @@ -0,0 +1,44 @@ +#include <linux/kernel.h> +#include <asm/pci-direct.h> +#include <asm/io.h> + +/* Direct PCI access. This is used for PCI accesses in early boot before + the PCI subsystem works. */ + +#define PDprintk(x...) + +u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset) +{ + u32 v; + outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); + v = inl(0xcfc); + if (v != 0xffffffff) + PDprintk("%x reading 4 from %x: %x\n", slot, offset, v); + return v; +} + +u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset) +{ + u8 v; + outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); + v = inb(0xcfc + (offset&3)); + PDprintk("%x reading 1 from %x: %x\n", slot, offset, v); + return v; +} + +u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset) +{ + u16 v; + outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); + v = inw(0xcfc + (offset&2)); + PDprintk("%x reading 2 from %x: %x\n", slot, offset, v); + return v; +} + +void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset, + u32 val) +{ + PDprintk("%x writing to %x: %x\n", slot, offset, val); + outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); + outl(val, 0xcfc); +} diff --git a/arch/x86_64/pci/Makefile b/arch/x86_64/pci/Makefile index a3f6ad57017..1eb18f421ed 100644 --- a/arch/x86_64/pci/Makefile +++ b/arch/x86_64/pci/Makefile @@ -9,7 +9,7 @@ obj-y := i386.o obj-$(CONFIG_PCI_DIRECT)+= direct.o obj-y += fixup.o init.o obj-$(CONFIG_ACPI) += acpi.o -obj-y += legacy.o irq.o common.o +obj-y += legacy.o irq.o common.o early.o # mmconfig has a 64bit special obj-$(CONFIG_PCI_MMCONFIG) += mmconfig.o direct.o @@ -23,3 +23,4 @@ common-y += ../../i386/pci/common.o fixup-y += ../../i386/pci/fixup.o i386-y += ../../i386/pci/i386.o init-y += ../../i386/pci/init.o +early-y += ../../i386/pci/early.o |