Add support for Intel Sandybridge CPU (northbridge part)

Change-Id: I06228ecf9cac931ad34e32871d5a4f2a4857b2ac
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/854
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 165 insertions, 0 deletions

diff --git a/src/northbridge/intel/sandybridge/early_init.c b/src/northbridge/intel/sandybridge/early_init.c
new file mode 100644
index 0000000000..f052fbc3d3
--- /dev/null
+++ b/src/northbridge/intel/sandybridge/early_init.c
@@ -0,0 +1,165 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2010 coresystems GmbH
+ * Copyright (C) 2011 Google Inc
+ *
+ * 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 <stdint.h>
+#include <stdlib.h>
+#include <console/console.h>
+#include <arch/io.h>
+#include <arch/romcc_io.h>
+#include <device/pci_def.h>
+#include "sandybridge.h"
+#include "pcie_config.c"
+
+static void sandybridge_setup_bars(void)
+{
+	/* Setting up Southbridge. In the northbridge code. */
+	printk(BIOS_DEBUG, "Setting up static southbridge registers...");
+	pci_write_config32(PCI_DEV(0, 0x1f, 0), RCBA, DEFAULT_RCBA | 1);
+
+	pci_write_config32(PCI_DEV(0, 0x1f, 0), PMBASE, DEFAULT_PMBASE | 1);
+	pci_write_config8(PCI_DEV(0, 0x1f, 0), 0x44 /* ACPI_CNTL */ , 0x80); /* Enable ACPI BAR */
+
+	printk(BIOS_DEBUG, " done.\n");
+
+	printk(BIOS_DEBUG, "Disabling Watchdog reboot...");
+	RCBA32(GCS) = RCBA32(GCS) | (1 << 5);	/* No reset */
+	outw((1 << 11), DEFAULT_PMBASE | 0x60 | 0x08);	/* halt timer */
+	printk(BIOS_DEBUG, " done.\n");
+
+	printk(BIOS_DEBUG, "Setting up static northbridge registers...");
+	/* Set up all hardcoded northbridge BARs */
+	pci_write_config32(PCI_DEV(0, 0x00, 0), EPBAR, DEFAULT_EPBAR | 1);
+	pci_write_config32(PCI_DEV(0, 0x00, 0), EPBAR + 4, (0LL+DEFAULT_EPBAR) >> 32);
+	pci_write_config32(PCI_DEV(0, 0x00, 0), MCHBAR, DEFAULT_MCHBAR | 1);
+	pci_write_config32(PCI_DEV(0, 0x00, 0), MCHBAR + 4, (0LL+DEFAULT_MCHBAR) >> 32);
+	pci_write_config32(PCI_DEV(0, 0x00, 0), PCIEXBAR, DEFAULT_PCIEXBAR | 5); /* 64MB - busses 0-63 */
+	pci_write_config32(PCI_DEV(0, 0x00, 0), PCIEXBAR + 4, (0LL+DEFAULT_PCIEXBAR) >> 32);
+	pci_write_config32(PCI_DEV(0, 0x00, 0), DMIBAR, DEFAULT_DMIBAR | 1);
+	pci_write_config32(PCI_DEV(0, 0x00, 0), DMIBAR + 4, (0LL+DEFAULT_DMIBAR) >> 32);
+
+	/* Set C0000-FFFFF to access RAM on both reads and writes */
+	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM0, 0x30);
+	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM1, 0x33);
+	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM2, 0x33);
+	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM3, 0x33);
+	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM4, 0x33);
+	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM5, 0x33);
+	pci_write_config8(PCI_DEV(0, 0x00, 0), PAM6, 0x33);
+
+	printk(BIOS_DEBUG, " done.\n");
+}
+
+static void sandybridge_setup_graphics(void)
+{
+	u32 reg32;
+	u16 reg16;
+	u8 reg8;
+
+	reg16 = pci_read_config16(PCI_DEV(0,2,0), PCI_DEVICE_ID);
+	switch (reg16) {
+	case 0x0102: /* GT1 Desktop */
+	case 0x0106: /* GT1 Mobile */
+	case 0x010a: /* GT1 Server */
+	case 0x0112: /* GT2 Desktop */
+	case 0x0116: /* GT2 Mobile */
+	case 0x0122: /* GT2 Desktop >=1.3GHz */
+	case 0x0126: /* GT2 Mobile >=1.3GHz */
+	case 0x0166: /* IvyBridge ??? */
+		break;
+	default:
+		printk(BIOS_DEBUG, "Graphics not supported by this CPU/chipset.\n");
+		return;
+	}
+
+	printk(BIOS_DEBUG, "Initializing Graphics...\n");
+
+	/* Setup IGD memory by setting GGC[7:3] = 1 for 32MB */
+	reg16 = pci_read_config16(PCI_DEV(0,0,0), GGC);
+	reg16 &= ~0x00f8;
+	reg16 |= 1 << 3;
+	/* Program GTT memory by setting GGC[9:8] = 2MB */
+	reg16 &= ~0x0300;
+	reg16 |= 2 << 8;
+	/* Enable VGA decode */
+	reg16 &= ~0x0002;
+	pci_write_config16(PCI_DEV(0,0,0), GGC, reg16);
+
+	/* Enable 256MB aperture */
+	reg8 = pci_read_config8(PCI_DEV(0, 2, 0), MSAC);
+	reg8 &= ~0x06;
+	reg8 |= 0x02;
+	pci_write_config8(PCI_DEV(0, 2, 0), MSAC, reg8);
+
+	/* Erratum workarounds */
+	MCHBAR8(0x5f10) = 0x20;
+
+	reg32 = MCHBAR32(0x5f00);
+	reg32 |= (1 << 9)|(1 << 10);
+	MCHBAR32(0x5f00) = reg32;
+
+	/* Enable SA Clock Gating */
+	reg32 = MCHBAR32(0x5f00);
+	MCHBAR32(0x5f00) = reg32 | 1;
+
+	/* GPU RC6 workaround for sighting 366252 */
+	reg32 = MCHBAR32(0x5d14);
+	reg32 |= (1 << 31);
+	MCHBAR32(0x5d14) = reg32;
+
+	/* VLW */
+	reg32 = MCHBAR32(0x6120);
+	reg32 &= ~(1 << 0);
+	MCHBAR32(0x6120) = reg32;
+
+	reg32 = MCHBAR32(0x5418);
+	reg32 |= (1 << 4) | (1 << 5);
+	MCHBAR32(0x5418) = reg32;
+}
+
+void sandybridge_early_initialization(int chipset_type)
+{
+	u32 capid0_a;
+	u8 reg8;
+
+	/* Device ID Override Enable should be done very early */
+	capid0_a = pci_read_config32(PCI_DEV(0, 0, 0), 0xe4);
+	if (capid0_a & (1 << 10)) {
+		reg8 = pci_read_config8(PCI_DEV(0, 0, 0), 0xf3);
+		reg8 &= ~7; /* Clear 2:0 */
+
+		if (chipset_type == SANDYBRIDGE_MOBILE)
+			reg8 |= 1; /* Set bit 0 */
+
+		pci_write_config8(PCI_DEV(0, 0, 0), 0xf3, reg8);
+	}
+
+	/* Setup all BARs required for early PCIe and raminit */
+	sandybridge_setup_bars();
+
+	/* Device Enable */
+	pci_write_config32(PCI_DEV(0, 0, 0), DEVEN, DEVEN_HOST | DEVEN_IGD);
+
+	sandybridge_setup_graphics();
+}
+
+void sandybridge_late_initialization(void)
+{
+}
+