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[PATCH] libpayload: Add pci_set_bus_master() function 

Allow the payload to enable a PCI device as a bus master.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Patrick Georgi <patrick.georgi@coresystems.de>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3672 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Jordan Crouse 2008-10-20 16:51:20 +00:00
parent 17f6a87788
commit 369a5f6c7a
2 changed files with 13 additions and 1 deletions
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8
payloads/libpayload/drivers/pci.c
View File

@ -112,3 +112,11 @@ u32 pci_read_resource(pcidev_t dev, int bar)
{
return pci_read_config32(dev, 0x10 + (bar * 4));
}
void pci_set_bus_master(pcidev_t dev)
{
u16 val = pci_read_config16(dev, REG_COMMAND);
val |= REG_COMMAND_BM;
pci_write_config16(dev, REG_COMMAND, val);
}

6
payloads/libpayload/include/pci.h
View File

@ -35,10 +35,12 @@
typedef u32 pcidev_t;
#define REG_VENDOR_ID 0x00
#define REG_DEVICE_ID 0x04
#define REG_COMMAND 0x04
#define REG_HEADER_TYPE 0x0E
#define REG_PRIMARY_BUS 0x18
#define REG_COMMAND_BM (1 << 2)
#define HEADER_TYPE_NORMAL 0
#define HEADER_TYPE_BRIDGE 1
#define HEADER_TYPE_CARDBUS 2
@ -64,4 +66,6 @@ void pci_write_config32(u32 device, u16 reg, u32 val);
int pci_find_device(u16 vid, u16 did, pcidev_t *dev);
u32 pci_read_resource(pcidev_t dev, int bar);
void pci_set_bus_master(pcidev_t dev);
#endif