2 * From Coreboot northbridge/intel/sandybridge/northbridge.c
4 * Copyright (C) 2007-2009 coresystems GmbH
5 * Copyright (C) 2011 The Chromium Authors
7 * SPDX-License-Identifier: GPL-2.0
15 #include <asm/intel_regs.h>
18 #include <asm/processor.h>
19 #include <asm/arch/pch.h>
20 #include <asm/arch/model_206ax.h>
21 #include <asm/arch/sandybridge.h>
23 int bridge_silicon_revision(struct udevice *dev)
25 struct cpuid_result result;
30 stepping = result.eax & 0xf;
31 dm_pci_read_config16(dev, PCI_DEVICE_ID, &bridge_id);
33 return bridge_id | stepping;
37 * Reserve everything between A segment and 1MB:
39 * 0xa0000 - 0xbffff: legacy VGA
40 * 0xc0000 - 0xcffff: VGA OPROM (needed by kernel)
41 * 0xe0000 - 0xfffff: SeaBIOS, if used, otherwise DMI
43 static const int legacy_hole_base_k = 0xa0000 / 1024;
44 static const int legacy_hole_size_k = 384;
46 static int get_pcie_bar(struct udevice *dev, u32 *base, u32 *len)
53 dm_pci_read_config32(dev, PCIEXBAR, &pciexbar_reg);
55 if (!(pciexbar_reg & (1 << 0)))
58 switch ((pciexbar_reg >> 1) & 3) {
60 *base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
62 *len = 256 * 1024 * 1024;
65 *base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
66 (1 << 28) | (1 << 27));
67 *len = 128 * 1024 * 1024;
70 *base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
71 (1 << 28) | (1 << 27) | (1 << 26));
72 *len = 64 * 1024 * 1024;
79 static void add_fixed_resources(struct udevice *dev, int index)
81 u32 pcie_config_base, pcie_config_size;
83 if (get_pcie_bar(dev, &pcie_config_base, &pcie_config_size)) {
84 debug("Adding PCIe config bar base=0x%08x size=0x%x\n",
85 pcie_config_base, pcie_config_size);
89 static void northbridge_dmi_init(struct udevice *dev, int rev)
91 /* Clear error status bits */
92 writel(0xffffffff, DMIBAR_REG(0x1c4));
93 writel(0xffffffff, DMIBAR_REG(0x1d0));
95 /* Steps prior to DMI ASPM */
96 if ((rev & BASE_REV_MASK) == BASE_REV_SNB) {
97 clrsetbits_le32(DMIBAR_REG(0x250), (1 << 22) | (1 << 20),
101 setbits_le32(DMIBAR_REG(0x238), 1 << 29);
103 if (rev >= SNB_STEP_D0) {
104 setbits_le32(DMIBAR_REG(0x1f8), 1 << 16);
105 } else if (rev >= SNB_STEP_D1) {
106 clrsetbits_le32(DMIBAR_REG(0x1f8), 1 << 26, 1 << 16);
107 setbits_le32(DMIBAR_REG(0x1fc), (1 << 12) | (1 << 23));
110 /* Enable ASPM on SNB link, should happen before PCH link */
111 if ((rev & BASE_REV_MASK) == BASE_REV_SNB)
112 setbits_le32(DMIBAR_REG(0xd04), 1 << 4);
114 setbits_le32(DMIBAR_REG(0x88), (1 << 1) | (1 << 0));
117 static void northbridge_init(struct udevice *dev, int rev)
121 add_fixed_resources(dev, 6);
122 northbridge_dmi_init(dev, rev);
124 bridge_type = readl(MCHBAR_REG(0x5f10));
125 bridge_type &= ~0xff;
127 if ((rev & BASE_REV_MASK) == BASE_REV_IVB) {
128 /* Enable Power Aware Interrupt Routing - fixed priority */
129 clrsetbits_8(MCHBAR_REG(0x5418), 0xf, 0x4);
131 /* 30h for IvyBridge */
134 /* 20h for Sandybridge */
137 writel(bridge_type, MCHBAR_REG(0x5f10));
140 * Set bit 0 of BIOS_RESET_CPL to indicate to the CPU
141 * that BIOS has initialized memory and power management
143 setbits_8(MCHBAR_REG(BIOS_RESET_CPL), 1);
144 debug("Set BIOS_RESET_CPL\n");
146 /* Configure turbo power limits 1ms after reset complete bit */
148 set_power_limits(28);
151 * CPUs with configurable TDP also need power limits set
152 * in MCHBAR. Use same values from MSR_PKG_POWER_LIMIT.
154 if (cpu_config_tdp_levels()) {
155 msr_t msr = msr_read(MSR_PKG_POWER_LIMIT);
157 writel(msr.lo, MCHBAR_REG(0x59A0));
158 writel(msr.hi, MCHBAR_REG(0x59A4));
161 /* Set here before graphics PM init */
162 writel(0x00100001, MCHBAR_REG(0x5500));
165 static void sandybridge_setup_northbridge_bars(struct udevice *dev)
167 /* Set up all hardcoded northbridge BARs */
168 debug("Setting up static registers\n");
169 dm_pci_write_config32(dev, EPBAR, DEFAULT_EPBAR | 1);
170 dm_pci_write_config32(dev, EPBAR + 4, (0LL + DEFAULT_EPBAR) >> 32);
171 dm_pci_write_config32(dev, MCHBAR, MCH_BASE_ADDRESS | 1);
172 dm_pci_write_config32(dev, MCHBAR + 4, (0LL + MCH_BASE_ADDRESS) >> 32);
173 /* 64MB - busses 0-63 */
174 dm_pci_write_config32(dev, PCIEXBAR, DEFAULT_PCIEXBAR | 5);
175 dm_pci_write_config32(dev, PCIEXBAR + 4,
176 (0LL + DEFAULT_PCIEXBAR) >> 32);
177 dm_pci_write_config32(dev, DMIBAR, DEFAULT_DMIBAR | 1);
178 dm_pci_write_config32(dev, DMIBAR + 4, (0LL + DEFAULT_DMIBAR) >> 32);
180 /* Set C0000-FFFFF to access RAM on both reads and writes */
181 dm_pci_write_config8(dev, PAM0, 0x30);
182 dm_pci_write_config8(dev, PAM1, 0x33);
183 dm_pci_write_config8(dev, PAM2, 0x33);
184 dm_pci_write_config8(dev, PAM3, 0x33);
185 dm_pci_write_config8(dev, PAM4, 0x33);
186 dm_pci_write_config8(dev, PAM5, 0x33);
187 dm_pci_write_config8(dev, PAM6, 0x33);
190 static int bd82x6x_northbridge_early_init(struct udevice *dev)
192 const int chipset_type = SANDYBRIDGE_MOBILE;
196 /* Device ID Override Enable should be done very early */
197 dm_pci_read_config32(dev, 0xe4, &capid0_a);
198 if (capid0_a & (1 << 10)) {
199 dm_pci_read_config8(dev, 0xf3, ®8);
200 reg8 &= ~7; /* Clear 2:0 */
202 if (chipset_type == SANDYBRIDGE_MOBILE)
203 reg8 |= 1; /* Set bit 0 */
205 dm_pci_write_config8(dev, 0xf3, reg8);
208 sandybridge_setup_northbridge_bars(dev);
211 dm_pci_write_config32(dev, DEVEN, DEVEN_HOST | DEVEN_IGD);
216 static int bd82x6x_northbridge_probe(struct udevice *dev)
220 if (!(gd->flags & GD_FLG_RELOC))
221 return bd82x6x_northbridge_early_init(dev);
223 rev = bridge_silicon_revision(dev);
224 northbridge_init(dev, rev);
229 static const struct udevice_id bd82x6x_northbridge_ids[] = {
230 { .compatible = "intel,bd82x6x-northbridge" },
234 U_BOOT_DRIVER(bd82x6x_northbridge_drv) = {
235 .name = "bd82x6x_northbridge",
236 .id = UCLASS_NORTHBRIDGE,
237 .of_match = bd82x6x_northbridge_ids,
238 .probe = bd82x6x_northbridge_probe,