4 * Copyright (C) 2007-2010 coresystems GmbH
5 * Copyright (C) 2011 Google Inc
7 * SPDX-License-Identifier: GPL-2.0+
14 #include <asm/arch/pch.h>
15 #include <asm/arch/sandybridge.h>
17 static void sandybridge_setup_bars(pci_dev_t pch_dev, pci_dev_t lpc_dev)
19 /* Setting up Southbridge. In the northbridge code. */
20 debug("Setting up static southbridge registers\n");
21 x86_pci_write_config32(lpc_dev, PCH_RCBA_BASE, DEFAULT_RCBA | 1);
23 x86_pci_write_config32(lpc_dev, PMBASE, DEFAULT_PMBASE | 1);
24 x86_pci_write_config8(lpc_dev, ACPI_CNTL, 0x80); /* Enable ACPI BAR */
26 debug("Disabling watchdog reboot\n");
27 setbits_le32(RCB_REG(GCS), 1 >> 5); /* No reset */
28 outw(1 << 11, DEFAULT_PMBASE | 0x60 | 0x08); /* halt timer */
30 /* Set up all hardcoded northbridge BARs */
31 debug("Setting up static registers\n");
32 x86_pci_write_config32(pch_dev, EPBAR, DEFAULT_EPBAR | 1);
33 x86_pci_write_config32(pch_dev, EPBAR + 4, (0LL + DEFAULT_EPBAR) >> 32);
34 x86_pci_write_config32(pch_dev, MCHBAR, DEFAULT_MCHBAR | 1);
35 x86_pci_write_config32(pch_dev, MCHBAR + 4,
36 (0LL + DEFAULT_MCHBAR) >> 32);
37 /* 64MB - busses 0-63 */
38 x86_pci_write_config32(pch_dev, PCIEXBAR, DEFAULT_PCIEXBAR | 5);
39 x86_pci_write_config32(pch_dev, PCIEXBAR + 4,
40 (0LL + DEFAULT_PCIEXBAR) >> 32);
41 x86_pci_write_config32(pch_dev, DMIBAR, DEFAULT_DMIBAR | 1);
42 x86_pci_write_config32(pch_dev, DMIBAR + 4,
43 (0LL + DEFAULT_DMIBAR) >> 32);
45 /* Set C0000-FFFFF to access RAM on both reads and writes */
46 x86_pci_write_config8(pch_dev, PAM0, 0x30);
47 x86_pci_write_config8(pch_dev, PAM1, 0x33);
48 x86_pci_write_config8(pch_dev, PAM2, 0x33);
49 x86_pci_write_config8(pch_dev, PAM3, 0x33);
50 x86_pci_write_config8(pch_dev, PAM4, 0x33);
51 x86_pci_write_config8(pch_dev, PAM5, 0x33);
52 x86_pci_write_config8(pch_dev, PAM6, 0x33);
55 static void sandybridge_setup_graphics(pci_dev_t pch_dev, pci_dev_t video_dev)
61 reg16 = x86_pci_read_config16(video_dev, PCI_DEVICE_ID);
63 case 0x0102: /* GT1 Desktop */
64 case 0x0106: /* GT1 Mobile */
65 case 0x010a: /* GT1 Server */
66 case 0x0112: /* GT2 Desktop */
67 case 0x0116: /* GT2 Mobile */
68 case 0x0122: /* GT2 Desktop >=1.3GHz */
69 case 0x0126: /* GT2 Mobile >=1.3GHz */
70 case 0x0156: /* IvyBridge */
71 case 0x0166: /* IvyBridge */
74 debug("Graphics not supported by this CPU/chipset\n");
78 debug("Initialising Graphics\n");
80 /* Setup IGD memory by setting GGC[7:3] = 1 for 32MB */
81 reg16 = x86_pci_read_config16(pch_dev, GGC);
84 /* Program GTT memory by setting GGC[9:8] = 2MB */
87 /* Enable VGA decode */
89 x86_pci_write_config16(pch_dev, GGC, reg16);
91 /* Enable 256MB aperture */
92 reg8 = x86_pci_read_config8(video_dev, MSAC);
95 x86_pci_write_config8(video_dev, MSAC, reg8);
97 /* Erratum workarounds */
98 reg32 = readl(MCHBAR_REG(0x5f00));
99 reg32 |= (1 << 9) | (1 << 10);
100 writel(reg32, MCHBAR_REG(0x5f00));
102 /* Enable SA Clock Gating */
103 reg32 = readl(MCHBAR_REG(0x5f00));
104 writel(reg32 | 1, MCHBAR_REG(0x5f00));
106 /* GPU RC6 workaround for sighting 366252 */
107 reg32 = readl(MCHBAR_REG(0x5d14));
109 writel(reg32, MCHBAR_REG(0x5d14));
112 reg32 = readl(MCHBAR_REG(0x6120));
114 writel(reg32, MCHBAR_REG(0x6120));
116 reg32 = readl(MCHBAR_REG(0x5418));
117 reg32 |= (1 << 4) | (1 << 5);
118 writel(reg32, MCHBAR_REG(0x5418));
121 void sandybridge_early_init(int chipset_type)
123 pci_dev_t pch_dev = PCH_DEV;
124 pci_dev_t video_dev = PCH_VIDEO_DEV;
125 pci_dev_t lpc_dev = PCH_LPC_DEV;
129 /* Device ID Override Enable should be done very early */
130 capid0_a = x86_pci_read_config32(pch_dev, 0xe4);
131 if (capid0_a & (1 << 10)) {
132 reg8 = x86_pci_read_config8(pch_dev, 0xf3);
133 reg8 &= ~7; /* Clear 2:0 */
135 if (chipset_type == SANDYBRIDGE_MOBILE)
136 reg8 |= 1; /* Set bit 0 */
138 x86_pci_write_config8(pch_dev, 0xf3, reg8);
141 /* Setup all BARs required for early PCIe and raminit */
142 sandybridge_setup_bars(pch_dev, lpc_dev);
145 x86_pci_write_config32(pch_dev, DEVEN, DEVEN_HOST | DEVEN_IGD);
147 sandybridge_setup_graphics(pch_dev, video_dev);
150 static int bd82x6x_northbridge_probe(struct udevice *dev)
155 static const struct udevice_id bd82x6x_northbridge_ids[] = {
156 { .compatible = "intel,bd82x6x-northbridge" },
160 U_BOOT_DRIVER(bd82x6x_northbridge_drv) = {
161 .name = "bd82x6x_northbridge",
162 .id = UCLASS_NORTHBRIDGE,
163 .of_match = bd82x6x_northbridge_ids,
164 .probe = bd82x6x_northbridge_probe,