summaryrefslogtreecommitdiff
path: root/src/southbridge/intel/bd82x6x/pci.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/southbridge/intel/bd82x6x/pci.c')
-rw-r--r--src/southbridge/intel/bd82x6x/pci.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/src/southbridge/intel/bd82x6x/pci.c b/src/southbridge/intel/bd82x6x/pci.c
new file mode 100644
index 0000000000..845a6fe5ad
--- /dev/null
+++ b/src/southbridge/intel/bd82x6x/pci.c
@@ -0,0 +1,145 @@
+/*
+ * 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 <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include "pch.h"
+
+static void pci_init(struct device *dev)
+{
+ u16 reg16;
+ u8 reg8;
+
+ printk(BIOS_DEBUG, "PCI init.\n");
+ /* Enable Bus Master */
+ reg16 = pci_read_config16(dev, PCI_COMMAND);
+ reg16 |= PCI_COMMAND_MASTER;
+ pci_write_config16(dev, PCI_COMMAND, reg16);
+
+ /* This device has no interrupt */
+ pci_write_config8(dev, INTR, 0xff);
+
+ /* disable parity error response and SERR */
+ reg16 = pci_read_config16(dev, BCTRL);
+ reg16 &= ~(1 << 0);
+ reg16 &= ~(1 << 1);
+ pci_write_config16(dev, BCTRL, reg16);
+
+ /* Master Latency Count must be set to 0x04! */
+ reg8 = pci_read_config8(dev, SMLT);
+ reg8 &= 0x07;
+ reg8 |= (0x04 << 3);
+ pci_write_config8(dev, SMLT, reg8);
+
+ /* Will this improve throughput of bus masters? */
+ pci_write_config8(dev, PCI_MIN_GNT, 0x06);
+
+ /* Clear errors in status registers */
+ reg16 = pci_read_config16(dev, PSTS);
+ //reg16 |= 0xf900;
+ pci_write_config16(dev, PSTS, reg16);
+
+ reg16 = pci_read_config16(dev, SECSTS);
+ // reg16 |= 0xf900;
+ pci_write_config16(dev, SECSTS, reg16);
+}
+
+#undef PCI_BRIDGE_UPDATE_COMMAND
+static void ich_pci_dev_enable_resources(struct device *dev)
+{
+ const struct pci_operations *ops;
+ uint16_t command;
+
+ /* Set the subsystem vendor and device id for mainboard devices */
+ ops = ops_pci(dev);
+ if (dev->on_mainboard && ops && ops->set_subsystem) {
+ printk(BIOS_DEBUG, "%s subsystem <- %02x/%02x\n",
+ dev_path(dev),
+ CONFIG_MAINBOARD_PCI_SUBSYSTEM_VENDOR_ID,
+ CONFIG_MAINBOARD_PCI_SUBSYSTEM_DEVICE_ID);
+ ops->set_subsystem(dev,
+ CONFIG_MAINBOARD_PCI_SUBSYSTEM_VENDOR_ID,
+ CONFIG_MAINBOARD_PCI_SUBSYSTEM_DEVICE_ID);
+ }
+
+ command = pci_read_config16(dev, PCI_COMMAND);
+ command |= dev->command;
+#ifdef PCI_BRIDGE_UPDATE_COMMAND
+ /* If we write to PCI_COMMAND, on some systems
+ * this will cause the ROM and APICs not being visible
+ * anymore.
+ */
+ printk(BIOS_DEBUG, "%s cmd <- %02x\n", dev_path(dev), command);
+ pci_write_config16(dev, PCI_COMMAND, command);
+#else
+ printk(BIOS_DEBUG, "%s cmd <- %02x (NOT WRITTEN!)\n", dev_path(dev), command);
+#endif
+}
+
+static void ich_pci_bus_enable_resources(struct device *dev)
+{
+ uint16_t ctrl;
+ /* enable IO in command register if there is VGA card
+ * connected with (even it does not claim IO resource)
+ */
+ if (dev->link_list->bridge_ctrl & PCI_BRIDGE_CTL_VGA)
+ dev->command |= PCI_COMMAND_IO;
+ ctrl = pci_read_config16(dev, PCI_BRIDGE_CONTROL);
+ ctrl |= dev->link_list->bridge_ctrl;
+ ctrl |= (PCI_BRIDGE_CTL_PARITY + PCI_BRIDGE_CTL_SERR); /* error check */
+ printk(BIOS_DEBUG, "%s bridge ctrl <- %04x\n", dev_path(dev), ctrl);
+ pci_write_config16(dev, PCI_BRIDGE_CONTROL, ctrl);
+
+ /* This is the reason we need our own pci_bus_enable_resources */
+ ich_pci_dev_enable_resources(dev);
+}
+
+static void set_subsystem(device_t dev, unsigned vendor, unsigned device)
+{
+ /* NOTE: This is not the default position! */
+ if (!vendor || !device) {
+ pci_write_config32(dev, 0x54,
+ pci_read_config32(dev, PCI_VENDOR_ID));
+ } else {
+ pci_write_config32(dev, 0x54,
+ ((device & 0xffff) << 16) | (vendor & 0xffff));
+ }
+}
+
+static struct pci_operations pci_ops = {
+ .set_subsystem = set_subsystem,
+};
+
+static struct device_operations device_ops = {
+ .read_resources = pci_bus_read_resources,
+ .set_resources = pci_dev_set_resources,
+ .enable_resources = ich_pci_bus_enable_resources,
+ .init = pci_init,
+ .scan_bus = pci_scan_bridge,
+ .ops_pci = &pci_ops,
+};
+
+static const struct pci_driver pch_pci __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x2448,
+};