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authorJordan Crouse <jordan.crouse@amd.com>2008-10-20 16:51:20 +0000
committerJordan Crouse <jordan.crouse@amd.com>2008-10-20 16:51:20 +0000
commit369a5f6c7a18516cb4da054d0e328f7464da9da7 (patch)
treecbb2dd56a1ec1227e8e8295c750c65bbe77c0bb6 /payloads/libpayload
parent17f6a8778817ad592a2458083a1ba46032df22f6 (diff)
downloadcoreboot-369a5f6c7a18516cb4da054d0e328f7464da9da7.tar.xz
[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
Diffstat (limited to 'payloads/libpayload')
-rw-r--r--payloads/libpayload/drivers/pci.c8
-rw-r--r--payloads/libpayload/include/pci.h6
2 files changed, 13 insertions, 1 deletions
diff --git a/payloads/libpayload/drivers/pci.c b/payloads/libpayload/drivers/pci.c
index fc1940afbc..be92613e88 100644
--- a/payloads/libpayload/drivers/pci.c
+++ b/payloads/libpayload/drivers/pci.c
@@ -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);
+}
+
diff --git a/payloads/libpayload/include/pci.h b/payloads/libpayload/include/pci.h
index 1b51f8cd78..93d1267ef5 100644
--- a/payloads/libpayload/include/pci.h
+++ b/payloads/libpayload/include/pci.h
@@ -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