Add support for Intel Panther Point PCH

[coreboot.git] / src / southbridge / intel / bd82x6x / early_smbus.c

diff --git a/src/southbridge/intel/bd82x6x/early_smbus.c b/src/southbridge/intel/bd82x6x/early_smbus.c
new file mode 100644 (file)
index 0000000..b13369a
--- /dev/null
+++ b/src/southbridge/intel/bd82x6x/early_smbus.c
@@ -0,0 +1,63 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <arch/romcc_io.h>
+#include <console/console.h>
+#include <device/pci_ids.h>
+#include <device/pci_def.h>
+#include "pch.h"
+#include "smbus.h"
+
+void enable_smbus(void)
+{
+       device_t dev;
+
+       /* Set the SMBus device statically. */
+       dev = PCI_DEV(0x0, 0x1f, 0x3);
+
+       /* Check to make sure we've got the right device. */
+       if (pci_read_config16(dev, 0x0) != 0x8086) {
+               die("SMBus controller not found!");
+       }
+
+       /* Set SMBus I/O base. */
+       pci_write_config32(dev, SMB_BASE,
+                          SMBUS_IO_BASE | PCI_BASE_ADDRESS_SPACE_IO);
+
+       /* Set SMBus enable. */
+       pci_write_config8(dev, HOSTC, HST_EN);
+
+       /* Set SMBus I/O space enable. */
+       pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_IO);
+
+       /* Disable interrupt generation. */
+       outb(0, SMBUS_IO_BASE + SMBHSTCTL);
+
+       /* Clear any lingering errors, so transactions can run. */
+       outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
+       print_debug("SMBus controller enabled.\n");
+}
+
+int smbus_read_byte(unsigned device, unsigned address)
+{
+       return do_smbus_read_byte(SMBUS_IO_BASE, device, address);
+}
+