Add support for Intel Panther Point PCH
Change-Id: Iac3cd25b36493bb203e849674320e113cc5fce32
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/853
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/southbridge/intel/bd82x6x/pcie.c b/src/southbridge/intel/bd82x6x/pcie.c
new file mode 100644
index 0000000..599692d
--- /dev/null
+++ b/src/southbridge/intel/bd82x6x/pcie.c
@@ -0,0 +1,306 @@
+/*
+ * 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/pciexp.h>
+#include <device/pci_ids.h>
+#include "pch.h"
+
+static u16 pcie_port_link_width(int port)
+{
+ u16 link_width;
+
+ link_width = pci_read_config16(
+ dev_find_slot(0, PCI_DEVFN(0x1c, port)), 0x52);
+ link_width >>= 4;
+ link_width &= 0x3f;
+ return link_width;
+}
+
+static void pch_pcie_pm_early(struct device *dev)
+{
+ u16 link_width_p0, link_width_p4;
+ u8 slot_power_limit = 10; /* 10W for x1 */
+ u32 reg32;
+ u8 reg8;
+
+ link_width_p0 = pcie_port_link_width(0);
+ link_width_p4 = pcie_port_link_width(4);
+
+ /* Enable dynamic clock gating where needed */
+ reg8 = pci_read_config8(dev, 0xe1);
+ switch (PCI_FUNC(dev->path.pci.devfn)) {
+ case 0: /* Port 0 */
+ if (link_width_p0 == 4)
+ slot_power_limit = 40; /* 40W for x4 */
+ else if (link_width_p0 == 2)
+ slot_power_limit = 20; /* 20W for x2 */
+ case 4: /* Port 4 */
+ if (link_width_p4 == 4)
+ slot_power_limit = 40; /* 40W for x4 */
+ else if (link_width_p4 == 2)
+ slot_power_limit = 20; /* 20W for x2 */
+ reg8 |= 0x3f;
+ break;
+ case 1: /* Port 1 only if Port 0 is x1 */
+ if (link_width_p0 == 1)
+ reg8 |= 0x3;
+ break;
+ case 2: /* Port 2 only if Port 0 is x1 or x2 */
+ case 3: /* Port 3 only if Port 0 is x1 or x2 */
+ if (link_width_p0 <= 2)
+ reg8 |= 0x3;
+ break;
+ case 5: /* Port 5 only if Port 4 is x1 */
+ if (link_width_p4 == 1)
+ reg8 |= 0x3;
+ break;
+ case 6: /* Port 7 only if Port 4 is x1 or x2 */
+ case 7: /* Port 7 only if Port 4 is x1 or x2 */
+ if (link_width_p4 <= 2)
+ reg8 |= 0x3;
+ break;
+ }
+ pci_write_config8(dev, 0xe1, reg8);
+
+ /* Set 0xE8[0] = 1 */
+ reg32 = pci_read_config32(dev, 0xe8);
+ reg32 |= 1;
+ pci_write_config32(dev, 0xe8, reg32);
+
+ /* Adjust Common Clock exit latency */
+ reg32 = pci_read_config32(dev, 0xd8);
+ reg32 &= ~(1 << 17);
+ reg32 |= (1 << 16) | (1 << 15);
+ reg32 &= ~(1 << 31); /* Disable PME# SCI for native PME handling */
+ pci_write_config32(dev, 0xd8, reg32);
+
+ /* Adjust ASPM L1 exit latency */
+ reg32 = pci_read_config32(dev, 0x4c);
+ reg32 &= ~((1 << 17) | (1 << 16) | (1 << 15));
+ if (RCBA32(0x2320) & (1 << 16)) {
+ /* If RCBA+2320[15]=1 set ASPM L1 to 8-16us */
+ reg32 |= (1 << 17);
+ } else {
+ /* Else set ASPM L1 to 2-4us */
+ reg32 |= (1 << 16);
+ }
+ pci_write_config32(dev, 0x4c, reg32);
+
+ /* Set slot power limit as configured above */
+ reg32 = pci_read_config32(dev, 0x54);
+ reg32 &= ~((1 << 15) | (1 << 16)); /* 16:15 = Slot power scale */
+ reg32 &= ~(0xff << 7); /* 14:7 = Slot power limit */
+ reg32 |= (slot_power_limit << 7);
+ pci_write_config32(dev, 0x54, reg32);
+}
+
+static void pch_pcie_pm_late(struct device *dev)
+{
+ enum aspm_type apmc;
+ u32 reg32;
+
+ /* Set 0x314 = 0x743a361b */
+ pci_mmio_write_config32(dev, 0x314, 0x743a361b);
+
+ /* Set 0x318[31:16] = 0x1414 */
+ reg32 = pci_mmio_read_config32(dev, 0x318);
+ reg32 &= 0x0000ffff;
+ reg32 |= 0x14140000;
+ pci_mmio_write_config32(dev, 0x318, reg32);
+
+ /* Set 0x324[5] = 1 */
+ reg32 = pci_mmio_read_config32(dev, 0x324);
+ reg32 |= (1 << 5);
+ pci_mmio_write_config32(dev, 0x324, reg32);
+
+ /* Set 0x330[7:0] = 0x40 */
+ reg32 = pci_mmio_read_config32(dev, 0x330);
+ reg32 &= ~(0xff);
+ reg32 |= 0x40;
+ pci_mmio_write_config32(dev, 0x330, reg32);
+
+ /* Set 0x33C[24:0] = 0x854c74 */
+ reg32 = pci_mmio_read_config32(dev, 0x33c);
+ reg32 &= 0xff000000;
+ reg32 |= 0x00854c74;
+ pci_mmio_write_config32(dev, 0x33c, reg32);
+
+ /* No IO-APIC, Disable EOI forwarding */
+ reg32 = pci_read_config32(dev, 0xd4);
+ reg32 |= (1 << 1);
+ pci_write_config32(dev, 0xd4, reg32);
+
+ /* Get configured ASPM state */
+ apmc = pci_read_config32(dev, 0x50) & 3;
+
+ /* If both L0s and L1 enabled then set root port 0xE8[1]=1 */
+ if (apmc == PCIE_ASPM_BOTH) {
+ reg32 = pci_read_config32(dev, 0xe8);
+ reg32 |= (1 << 1);
+ pci_write_config32(dev, 0xe8, reg32);
+ }
+}
+
+static void pci_init(struct device *dev)
+{
+ u16 reg16;
+ u32 reg32;
+
+ printk(BIOS_DEBUG, "Initializing PCH PCIe bridge.\n");
+
+ /* Enable Bus Master */
+ reg32 = pci_read_config32(dev, PCI_COMMAND);
+ reg32 |= PCI_COMMAND_MASTER;
+ pci_write_config32(dev, PCI_COMMAND, reg32);
+
+ /* Set Cache Line Size to 0x10 */
+ // This has no effect but the OS might expect it
+ pci_write_config8(dev, 0x0c, 0x10);
+
+ reg16 = pci_read_config16(dev, 0x3e);
+ reg16 &= ~(1 << 0); /* disable parity error response */
+ // reg16 &= ~(1 << 1); /* disable SERR */
+ reg16 |= (1 << 2); /* ISA enable */
+ pci_write_config16(dev, 0x3e, reg16);
+
+#ifdef EVEN_MORE_DEBUG
+ reg32 = pci_read_config32(dev, 0x20);
+ printk(BIOS_SPEW, " MBL = 0x%08x\n", reg32);
+ reg32 = pci_read_config32(dev, 0x24);
+ printk(BIOS_SPEW, " PMBL = 0x%08x\n", reg32);
+ reg32 = pci_read_config32(dev, 0x28);
+ printk(BIOS_SPEW, " PMBU32 = 0x%08x\n", reg32);
+ reg32 = pci_read_config32(dev, 0x2c);
+ printk(BIOS_SPEW, " PMLU32 = 0x%08x\n", reg32);
+#endif
+
+ /* Clear errors in status registers */
+ reg16 = pci_read_config16(dev, 0x06);
+ //reg16 |= 0xf900;
+ pci_write_config16(dev, 0x06, reg16);
+
+ reg16 = pci_read_config16(dev, 0x1e);
+ //reg16 |= 0xf900;
+ pci_write_config16(dev, 0x1e, reg16);
+
+ /* Power Management init after enumeration */
+ pch_pcie_pm_late(dev);
+}
+
+static void pch_pcie_enable(device_t dev)
+{
+ /* Power Management init before enumeration */
+ pch_pcie_pm_early(dev);
+}
+
+static void pcie_set_subsystem(device_t dev, unsigned vendor, unsigned device)
+{
+ /* NOTE: This is not the default position! */
+ if (!vendor || !device) {
+ pci_write_config32(dev, 0x94,
+ pci_read_config32(dev, 0));
+ } else {
+ pci_write_config32(dev, 0x94,
+ ((device & 0xffff) << 16) | (vendor & 0xffff));
+ }
+}
+
+static struct pci_operations pci_ops = {
+ .set_subsystem = pcie_set_subsystem,
+};
+
+static struct device_operations device_ops = {
+ .read_resources = pci_bus_read_resources,
+ .set_resources = pci_dev_set_resources,
+ .enable_resources = pci_bus_enable_resources,
+ .init = pci_init,
+ .enable = pch_pcie_enable,
+ .scan_bus = pciexp_scan_bridge,
+ .ops_pci = &pci_ops,
+};
+
+static const struct pci_driver pch_pcie_port1 __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x1c10, /* D28:F0 */
+};
+
+static const struct pci_driver pch_pcie_port1_a __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x1e10, /* D28:F0 */
+};
+
+static const struct pci_driver pch_pcie_port2 __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x1c12, /* D28:F1 */
+};
+
+static const struct pci_driver pch_pcie_port3 __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x1c14, /* D28:F2 */
+};
+
+static const struct pci_driver pch_pcie_port3_a __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x1e14, /* D28:F2 */
+};
+
+static const struct pci_driver pch_pcie_port4 __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x1c16, /* D28:F3 */
+};
+
+static const struct pci_driver pch_pcie_port4_a __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x1e16, /* D28:F3 */
+};
+
+static const struct pci_driver pch_pcie_port5 __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x1c18, /* D28:F4 */
+};
+
+static const struct pci_driver pch_pcie_port6 __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x1c1a, /* D28:F5 */
+};
+
+static const struct pci_driver pch_pcie_port7 __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x1c1c, /* D28:F6 */
+};
+
+static const struct pci_driver pch_pcie_port8 __pci_driver = {
+ .ops = &device_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = 0x1c1e, /* D28:F7 */
+};