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

1 files changed, 92 insertions, 0 deletions

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;
+}