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authorJordan Crouse <jordan.crouse@amd.com>2008-04-10 22:50:44 +0000
committerJordan Crouse <jordan.crouse@amd.com>2008-04-10 22:50:44 +0000
commit234e87f137faff67c391c4df678a82b763089119 (patch)
tree18ff4031c221f2f4aebda4207157334c169ad2a2 /payloads/libpayload/drivers
parent30939bdffd0435df4aa0830b2da1ef06ceebfba3 (diff)
libpayload: Support functions for Geode
The Geode video driver will require a number of support functions, including udelay(), PCI bus walking and MSRs. This adds those functions in preparation for the actual code. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3231 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'payloads/libpayload/drivers')
-rw-r--r--payloads/libpayload/drivers/Makefile.inc1
-rw-r--r--payloads/libpayload/drivers/pci.c92
2 files changed, 93 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/Makefile.inc b/payloads/libpayload/drivers/Makefile.inc
index 746ba45255..9a8d2d8448 100644
--- a/payloads/libpayload/drivers/Makefile.inc
+++ b/payloads/libpayload/drivers/Makefile.inc
@@ -27,6 +27,7 @@
## OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
## SUCH DAMAGE.
##
+TARGETS-y += drivers/pci.o
TARGETS-$(CONFIG_SERIAL_CONSOLE) += drivers/serial.o
TARGETS-$(CONFIG_PC_KEYBOARD) += drivers/keyboard.o
diff --git a/payloads/libpayload/drivers/pci.c b/payloads/libpayload/drivers/pci.c
new file mode 100644
index 0000000000..c6f48dd987
--- /dev/null
+++ b/payloads/libpayload/drivers/pci.c
@@ -0,0 +1,92 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <libpayload.h>
+#include <pci.h>
+
+static int find_on_bus(int bus, unsigned short vid, unsigned short did,
+ pcidev_t * dev)
+{
+ int devfn;
+ unsigned int val;
+ unsigned char hdr;
+
+ for (devfn = 0; devfn < 0x100; devfn++) {
+ pci_read_dword(bus, devfn, REG_VENDOR_ID, &val);
+
+ if (val == 0xffffffff || val == 0x00000000 ||
+ val == 0x0000ffff || val == 0xffff0000)
+ continue;
+
+ if (val == ((did << 16) | vid)) {
+ *dev = PCIDEV(bus, devfn);
+ return 1;
+ }
+
+ pci_read_byte(bus, devfn, REG_HEADER_TYPE, &hdr);
+
+ hdr &= 0x7F;
+
+ if (hdr == HEADER_TYPE_BRIDGE || hdr == HEADER_TYPE_CARDBUS) {
+ unsigned int busses;
+ pci_read_dword(bus, devfn, REG_PRIMARY_BUS, &busses);
+ if (find_on_bus((busses >> 8) & 0xFF, vid, did, dev))
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+void pci_read_dword(unsigned int bus, unsigned int devfn,
+ unsigned int reg, unsigned int *val)
+{
+ outl(PCI_ADDR(bus, devfn, reg), 0xCF8);
+ *val = inl(0xCFC);
+}
+
+void pci_read_byte(unsigned int bus, unsigned int devfn,
+ unsigned int reg, unsigned char *val)
+{
+ outl(PCI_ADDR(bus, devfn, reg), 0xCF8);
+ *val = inb(0xCFC + (reg & 3));
+}
+
+int pci_find_device(unsigned short vid, unsigned short did, pcidev_t * dev)
+{
+ return find_on_bus(0, vid, did, dev);
+}
+
+unsigned int pci_read_resource(pcidev_t dev, int bar)
+{
+ unsigned int val;
+ pci_read_dword(PCIDEV_BUS(dev), PCIDEV_DEVFN(dev), 0x10 + (bar * 4),
+ &val);
+ return val;
+}