x86: ivybridge: Add northbridge init functions

Add init for the northbridge, another part of the platform controller hub.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/ivybridge/Makefile

@@ -13,6 +13,7 @@ obj-y += lpc.o
 obj-y += me_status.o
 obj-y += model_206ax.o
 obj-y += microcode_intel.o
+obj-y += northbridge.o
 obj-y += pch.o
 obj-y += pci.o
 obj-y += report_platform.o

arch/x86/cpu/ivybridge/bd82x6x.c

@@ -128,6 +128,8 @@ int bd82x6x_init(void)
 
 	bd82x6x_pci_init(PCH_DEV);
 	bd82x6x_sata_enable(PCH_SATA_DEV, blob, sata_node);
+	northbridge_enable(PCH_DEV);
+	northbridge_init(PCH_DEV);
 
 	return 0;
 }

arch/x86/cpu/ivybridge/northbridge.c

@@ -0,0 +1,188 @@
+/*
+ * From Coreboot northbridge/intel/sandybridge/northbridge.c
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2011 The Chromium Authors
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <asm/msr.h>
+#include <asm/acpi.h>
+#include <asm/cpu.h>
+#include <asm/io.h>
+#include <asm/pci.h>
+#include <asm/processor.h>
+#include <asm/arch/pch.h>
+#include <asm/arch/model_206ax.h>
+#include <asm/arch/sandybridge.h>
+
+static int bridge_revision_id = -1;
+
+int bridge_silicon_revision(void)
+{
+	if (bridge_revision_id < 0) {
+		struct cpuid_result result;
+		uint8_t stepping, bridge_id;
+		pci_dev_t dev;
+
+		result = cpuid(1);
+		stepping = result.eax & 0xf;
+		dev = PCI_BDF(0, 0, 0);
+		bridge_id = pci_read_config16(dev, PCI_DEVICE_ID) & 0xf0;
+		bridge_revision_id = bridge_id | stepping;
+	}
+
+	return bridge_revision_id;
+}
+
+/*
+ * Reserve everything between A segment and 1MB:
+ *
+ * 0xa0000 - 0xbffff: legacy VGA
+ * 0xc0000 - 0xcffff: VGA OPROM (needed by kernel)
+ * 0xe0000 - 0xfffff: SeaBIOS, if used, otherwise DMI
+ */
+static const int legacy_hole_base_k = 0xa0000 / 1024;
+static const int legacy_hole_size_k = 384;
+
+static int get_pcie_bar(u32 *base, u32 *len)
+{
+	pci_dev_t dev = PCI_BDF(0, 0, 0);
+	u32 pciexbar_reg;
+
+	*base = 0;
+	*len = 0;
+
+	pciexbar_reg = pci_read_config32(dev, PCIEXBAR);
+
+	if (!(pciexbar_reg & (1 << 0)))
+		return 0;
+
+	switch ((pciexbar_reg >> 1) & 3) {
+	case 0: /* 256MB */
+		*base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
+				(1 << 28));
+		*len = 256 * 1024 * 1024;
+		return 1;
+	case 1: /* 128M */
+		*base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
+				(1 << 28) | (1 << 27));
+		*len = 128 * 1024 * 1024;
+		return 1;
+	case 2: /* 64M */
+		*base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
+				(1 << 28) | (1 << 27) | (1 << 26));
+		*len = 64 * 1024 * 1024;
+		return 1;
+	}
+
+	return 0;
+}
+
+static void add_fixed_resources(pci_dev_t dev, int index)
+{
+	u32 pcie_config_base, pcie_config_size;
+
+	if (get_pcie_bar(&pcie_config_base, &pcie_config_size)) {
+		debug("Adding PCIe config bar base=0x%08x size=0x%x\n",
+		      pcie_config_base, pcie_config_size);
+	}
+}
+
+static void northbridge_dmi_init(pci_dev_t dev)
+{
+	/* Clear error status bits */
+	writel(0xffffffff, DMIBAR_REG(0x1c4));
+	writel(0xffffffff, DMIBAR_REG(0x1d0));
+
+	/* Steps prior to DMI ASPM */
+	if ((bridge_silicon_revision() & BASE_REV_MASK) == BASE_REV_SNB) {
+		clrsetbits_le32(DMIBAR_REG(0x250), (1 << 22) | (1 << 20),
+				1 << 21);
+	}
+
+	setbits_le32(DMIBAR_REG(0x238), 1 << 29);
+
+	if (bridge_silicon_revision() >= SNB_STEP_D0) {
+		setbits_le32(DMIBAR_REG(0x1f8), 1 << 16);
+	} else if (bridge_silicon_revision() >= SNB_STEP_D1) {
+		clrsetbits_le32(DMIBAR_REG(0x1f8), 1 << 26, 1 << 16);
+		setbits_le32(DMIBAR_REG(0x1fc), (1 << 12) | (1 << 23));
+	}
+
+	/* Enable ASPM on SNB link, should happen before PCH link */
+	if ((bridge_silicon_revision() & BASE_REV_MASK) == BASE_REV_SNB)
+		setbits_le32(DMIBAR_REG(0xd04), 1 << 4);
+
+	setbits_le32(DMIBAR_REG(0x88), (1 << 1) | (1 << 0));
+}
+
+void northbridge_init(pci_dev_t dev)
+{
+	u32 bridge_type;
+
+	add_fixed_resources(dev, 6);
+	northbridge_dmi_init(dev);
+
+	bridge_type = readl(MCHBAR_REG(0x5f10));
+	bridge_type &= ~0xff;
+
+	if ((bridge_silicon_revision() & BASE_REV_MASK) == BASE_REV_IVB) {
+		/* Enable Power Aware Interrupt Routing - fixed priority */
+		clrsetbits_8(MCHBAR_REG(0x5418), 0xf, 0x4);
+
+		/* 30h for IvyBridge */
+		bridge_type |= 0x30;
+	} else {
+		/* 20h for Sandybridge */
+		bridge_type |= 0x20;
+	}
+	writel(bridge_type, MCHBAR_REG(0x5f10));
+
+	/*
+	 * Set bit 0 of BIOS_RESET_CPL to indicate to the CPU
+	 * that BIOS has initialized memory and power management
+	 */
+	setbits_8(MCHBAR_REG(BIOS_RESET_CPL), 1);
+	debug("Set BIOS_RESET_CPL\n");
+
+	/* Configure turbo power limits 1ms after reset complete bit */
+	mdelay(1);
+	set_power_limits(28);
+
+	/*
+	 * CPUs with configurable TDP also need power limits set
+	 * in MCHBAR.  Use same values from MSR_PKG_POWER_LIMIT.
+	 */
+	if (cpu_config_tdp_levels()) {
+		msr_t msr = msr_read(MSR_PKG_POWER_LIMIT);
+
+		writel(msr.lo, MCHBAR_REG(0x59A0));
+		writel(msr.hi, MCHBAR_REG(0x59A4));
+	}
+
+	/* Set here before graphics PM init */
+	writel(0x00100001, MCHBAR_REG(0x5500));
+}
+
+void northbridge_enable(pci_dev_t dev)
+{
+#if CONFIG_HAVE_ACPI_RESUME
+	switch (pci_read_config32(dev, SKPAD)) {
+	case 0xcafebabe:
+		debug("Normal boot.\n");
+		apci_set_slp_type(0);
+		break;
+	case 0xcafed00d:
+		debug("S3 Resume.\n");
+		apci_set_slp_type(3);
+		break;
+	default:
+		debug("Unknown boot method, assuming normal.\n");
+		apci_set_slp_type(0);
+		break;
+	}
+#endif
+}

arch/x86/include/asm/arch-ivybridge/model_206ax.h

@@ -79,4 +79,8 @@
 #define PSS_LATENCY_TRANSITION		10
 #define PSS_LATENCY_BUSMASTER		10
 
+/* Configure power limits for turbo mode */
+void set_power_limits(u8 power_limit_1_time);
+int cpu_config_tdp_levels(void);
+
 #endif

arch/x86/include/asm/arch-ivybridge/sandybridge.h

@@ -97,11 +97,22 @@
 /*
  * MCHBAR
  */
-#define MCHBAR_REG(reg)		(DEFAULT_RCBA + (reg))
+#define MCHBAR_REG(reg)		(DEFAULT_MCHBAR + (reg))
 
 #define SSKPD		0x5d14	/* 16bit (scratchpad) */
 #define BIOS_RESET_CPL	0x5da8	/* 8bit */
 
+/*
+ * DMIBAR
+ */
+
+#define DMIBAR_REG(x)	(DEFAULT_DMIBAR + x)
+
+int bridge_silicon_revision(void);
+
+void northbridge_enable(pci_dev_t dev);
+void northbridge_init(pci_dev_t dev);
+
 void report_platform_info(void);
 
 void sandybridge_early_init(int chipset_type);