1 // SPDX-License-Identifier: GPL-2.0
3 * From Coreboot northbridge/intel/sandybridge/northbridge.c
5 * Copyright (C) 2007-2009 coresystems GmbH
6 * Copyright (C) 2011 The Chromium Authors
14 #include <asm/intel_regs.h>
17 #include <asm/processor.h>
18 #include <asm/arch/pch.h>
19 #include <asm/arch/model_206ax.h>
20 #include <asm/arch/sandybridge.h>
21 #include <linux/delay.h>
23 DECLARE_GLOBAL_DATA_PTR;
25 int bridge_silicon_revision(struct udevice *dev)
27 struct cpuid_result result;
32 stepping = result.eax & 0xf;
33 dm_pci_read_config16(dev, PCI_DEVICE_ID, &bridge_id);
35 return bridge_id | stepping;
38 static int get_pcie_bar(struct udevice *dev, u32 *base, u32 *len)
45 dm_pci_read_config32(dev, PCIEXBAR, &pciexbar_reg);
47 if (!(pciexbar_reg & (1 << 0)))
50 switch ((pciexbar_reg >> 1) & 3) {
52 *base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
54 *len = 256 * 1024 * 1024;
57 *base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
58 (1 << 28) | (1 << 27));
59 *len = 128 * 1024 * 1024;
62 *base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) |
63 (1 << 28) | (1 << 27) | (1 << 26));
64 *len = 64 * 1024 * 1024;
71 static void add_fixed_resources(struct udevice *dev, int index)
73 u32 pcie_config_base, pcie_config_size;
75 if (get_pcie_bar(dev, &pcie_config_base, &pcie_config_size)) {
76 debug("Adding PCIe config bar base=0x%08x size=0x%x\n",
77 pcie_config_base, pcie_config_size);
81 static void northbridge_dmi_init(struct udevice *dev, int rev)
83 /* Clear error status bits */
84 writel(0xffffffff, DMIBAR_REG(0x1c4));
85 writel(0xffffffff, DMIBAR_REG(0x1d0));
87 /* Steps prior to DMI ASPM */
88 if ((rev & BASE_REV_MASK) == BASE_REV_SNB) {
89 clrsetbits_le32(DMIBAR_REG(0x250), (1 << 22) | (1 << 20),
93 setbits_le32(DMIBAR_REG(0x238), 1 << 29);
95 if (rev >= SNB_STEP_D0) {
96 setbits_le32(DMIBAR_REG(0x1f8), 1 << 16);
97 } else if (rev >= SNB_STEP_D1) {
98 clrsetbits_le32(DMIBAR_REG(0x1f8), 1 << 26, 1 << 16);
99 setbits_le32(DMIBAR_REG(0x1fc), (1 << 12) | (1 << 23));
102 /* Enable ASPM on SNB link, should happen before PCH link */
103 if ((rev & BASE_REV_MASK) == BASE_REV_SNB)
104 setbits_le32(DMIBAR_REG(0xd04), 1 << 4);
106 setbits_le32(DMIBAR_REG(0x88), (1 << 1) | (1 << 0));
109 static void northbridge_init(struct udevice *dev, int rev)
113 add_fixed_resources(dev, 6);
114 northbridge_dmi_init(dev, rev);
116 bridge_type = readl(MCHBAR_REG(0x5f10));
117 bridge_type &= ~0xff;
119 if ((rev & BASE_REV_MASK) == BASE_REV_IVB) {
120 /* Enable Power Aware Interrupt Routing - fixed priority */
121 clrsetbits_8(MCHBAR_REG(0x5418), 0xf, 0x4);
123 /* 30h for IvyBridge */
126 /* 20h for Sandybridge */
129 writel(bridge_type, MCHBAR_REG(0x5f10));
132 * Set bit 0 of BIOS_RESET_CPL to indicate to the CPU
133 * that BIOS has initialized memory and power management
135 setbits_8(MCHBAR_REG(BIOS_RESET_CPL), 1);
136 debug("Set BIOS_RESET_CPL\n");
138 /* Configure turbo power limits 1ms after reset complete bit */
140 set_power_limits(28);
143 * CPUs with configurable TDP also need power limits set
144 * in MCHBAR. Use same values from MSR_PKG_POWER_LIMIT.
146 if (cpu_ivybridge_config_tdp_levels()) {
147 msr_t msr = msr_read(MSR_PKG_POWER_LIMIT);
149 writel(msr.lo, MCHBAR_REG(0x59A0));
150 writel(msr.hi, MCHBAR_REG(0x59A4));
153 /* Set here before graphics PM init */
154 writel(0x00100001, MCHBAR_REG(0x5500));
157 static void sandybridge_setup_northbridge_bars(struct udevice *dev)
159 /* Set up all hardcoded northbridge BARs */
160 debug("Setting up static registers\n");
161 dm_pci_write_config32(dev, EPBAR, DEFAULT_EPBAR | 1);
162 dm_pci_write_config32(dev, EPBAR + 4, (0LL + DEFAULT_EPBAR) >> 32);
163 dm_pci_write_config32(dev, MCHBAR, MCH_BASE_ADDRESS | 1);
164 dm_pci_write_config32(dev, MCHBAR + 4, (0LL + MCH_BASE_ADDRESS) >> 32);
165 /* 64MB - busses 0-63 */
166 dm_pci_write_config32(dev, PCIEXBAR, DEFAULT_PCIEXBAR | 5);
167 dm_pci_write_config32(dev, PCIEXBAR + 4,
168 (0LL + DEFAULT_PCIEXBAR) >> 32);
169 dm_pci_write_config32(dev, DMIBAR, DEFAULT_DMIBAR | 1);
170 dm_pci_write_config32(dev, DMIBAR + 4, (0LL + DEFAULT_DMIBAR) >> 32);
172 /* Set C0000-FFFFF to access RAM on both reads and writes */
173 dm_pci_write_config8(dev, PAM0, 0x30);
174 dm_pci_write_config8(dev, PAM1, 0x33);
175 dm_pci_write_config8(dev, PAM2, 0x33);
176 dm_pci_write_config8(dev, PAM3, 0x33);
177 dm_pci_write_config8(dev, PAM4, 0x33);
178 dm_pci_write_config8(dev, PAM5, 0x33);
179 dm_pci_write_config8(dev, PAM6, 0x33);
183 * sandybridge_init_iommu() - Set up IOMMU so that azalia can be used
185 * It is not obvious where these values come from. They may be undocumented.
187 static void sandybridge_init_iommu(struct udevice *dev)
191 dm_pci_read_config32(dev, 0xe4, &capid0_a);
192 if (capid0_a & (1 << 23)) {
193 log_debug("capid0_a not needed\n");
198 writel(IOMMU_BASE1 >> 32, MCHBAR_REG(0x5404));
199 writel(IOMMU_BASE1 | 1, MCHBAR_REG(0x5400));
200 writel(IOMMU_BASE2 >> 32, MCHBAR_REG(0x5414));
201 writel(IOMMU_BASE2 | 1, MCHBAR_REG(0x5410));
204 writel(0x80000000, IOMMU_BASE1 + 0xff0);
206 /* Enable azalia sound */
207 writel(0x20000000, IOMMU_BASE2 + 0xff0);
208 writel(0xa0000000, IOMMU_BASE2 + 0xff0);
211 static int bd82x6x_northbridge_early_init(struct udevice *dev)
213 const int chipset_type = SANDYBRIDGE_MOBILE;
217 /* Device ID Override Enable should be done very early */
218 dm_pci_read_config32(dev, 0xe4, &capid0_a);
219 if (capid0_a & (1 << 10)) {
220 dm_pci_read_config8(dev, 0xf3, ®8);
221 reg8 &= ~7; /* Clear 2:0 */
223 if (chipset_type == SANDYBRIDGE_MOBILE)
224 reg8 |= 1; /* Set bit 0 */
226 dm_pci_write_config8(dev, 0xf3, reg8);
229 sandybridge_setup_northbridge_bars(dev);
231 /* Setup IOMMU BARs */
232 sandybridge_init_iommu(dev);
235 dm_pci_write_config32(dev, DEVEN, DEVEN_HOST | DEVEN_IGD);
240 static int bd82x6x_northbridge_probe(struct udevice *dev)
244 if (!(gd->flags & GD_FLG_RELOC))
245 return bd82x6x_northbridge_early_init(dev);
247 rev = bridge_silicon_revision(dev);
248 northbridge_init(dev, rev);
253 static const struct udevice_id bd82x6x_northbridge_ids[] = {
254 { .compatible = "intel,bd82x6x-northbridge" },
258 U_BOOT_DRIVER(bd82x6x_northbridge_drv) = {
259 .name = "bd82x6x_northbridge",
260 .id = UCLASS_NORTHBRIDGE,
261 .of_match = bd82x6x_northbridge_ids,
262 .probe = bd82x6x_northbridge_probe,