| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <console/console.h> |
| #include <device/mmio.h> |
| #include <device/device.h> |
| #include <device/pci_ops.h> |
| #include <device/pci_def.h> |
| #include <option.h> |
| #include <romstage_handoff.h> |
| #include <types.h> |
| |
| #include "sandybridge.h" |
| |
| static void systemagent_vtd_init(void) |
| { |
| const u32 capid0_a = pci_read_config32(HOST_BRIDGE, CAPID0_A); |
| if (capid0_a & (1 << 23)) |
| return; |
| |
| /* Setup BARs */ |
| MCHBAR32(GFXVTBAR + 4) = GFXVT_BASE >> 32; |
| MCHBAR32(GFXVTBAR) = GFXVT_BASE | 1; |
| MCHBAR32(VTVC0BAR + 4) = VTVC0_BASE >> 32; |
| MCHBAR32(VTVC0BAR) = VTVC0_BASE | 1; |
| |
| /* Lock policies */ |
| write32((void *)(GFXVT_BASE + 0xff0), 0x80000000); |
| |
| const struct device *const azalia = pcidev_on_root(0x1b, 0); |
| if (azalia && azalia->enabled) { |
| write32((void *)(VTVC0_BASE + 0xff0), 0x20000000); |
| write32((void *)(VTVC0_BASE + 0xff0), 0xa0000000); |
| } else { |
| write32((void *)(VTVC0_BASE + 0xff0), 0x80000000); |
| } |
| } |
| |
| static void enable_pam_region(void) |
| { |
| pci_write_config8(HOST_BRIDGE, PAM0, 0x30); |
| pci_write_config8(HOST_BRIDGE, PAM1, 0x33); |
| pci_write_config8(HOST_BRIDGE, PAM2, 0x33); |
| pci_write_config8(HOST_BRIDGE, PAM3, 0x33); |
| pci_write_config8(HOST_BRIDGE, PAM4, 0x33); |
| pci_write_config8(HOST_BRIDGE, PAM5, 0x33); |
| pci_write_config8(HOST_BRIDGE, PAM6, 0x33); |
| } |
| |
| static void sandybridge_setup_bars(void) |
| { |
| printk(BIOS_DEBUG, "Setting up static northbridge registers..."); |
| /* Set up all hardcoded northbridge BARs */ |
| pci_write_config32(HOST_BRIDGE, EPBAR, DEFAULT_EPBAR | 1); |
| pci_write_config32(HOST_BRIDGE, EPBAR + 4, (0LL + DEFAULT_EPBAR) >> 32); |
| pci_write_config32(HOST_BRIDGE, MCHBAR, (uintptr_t)DEFAULT_MCHBAR | 1); |
| pci_write_config32(HOST_BRIDGE, MCHBAR + 4, (0LL + (uintptr_t)DEFAULT_MCHBAR) >> 32); |
| pci_write_config32(HOST_BRIDGE, DMIBAR, (uintptr_t)DEFAULT_DMIBAR | 1); |
| pci_write_config32(HOST_BRIDGE, DMIBAR + 4, (0LL + (uintptr_t)DEFAULT_DMIBAR) >> 32); |
| |
| printk(BIOS_DEBUG, " done\n"); |
| } |
| |
| static void sandybridge_setup_graphics(void) |
| { |
| u32 reg32; |
| u16 reg16; |
| u8 reg8, gfxsize; |
| |
| 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 0x0152: /* IvyBridge */ |
| case 0x0156: /* IvyBridge */ |
| case 0x0162: /* IvyBridge */ |
| case 0x0166: /* IvyBridge */ |
| case 0x016a: /* IvyBridge */ |
| break; |
| default: |
| printk(BIOS_DEBUG, "Graphics not supported by this CPU/chipset.\n"); |
| return; |
| } |
| |
| printk(BIOS_DEBUG, "Initializing Graphics...\n"); |
| |
| if (get_option(&gfxsize, "gfx_uma_size") != CB_SUCCESS) { |
| /* Setup IGD memory by setting GGC[7:3] = 1 for 32MB */ |
| gfxsize = 0; |
| } |
| reg16 = pci_read_config16(HOST_BRIDGE, GGC); |
| reg16 &= ~0x00f8; |
| reg16 |= (gfxsize + 1) << 3; |
| /* Program GTT memory by setting GGC[9:8] = 2MB */ |
| reg16 &= ~0x0300; |
| reg16 |= 2 << 8; |
| /* Enable VGA decode */ |
| reg16 &= ~0x0002; |
| pci_write_config16(HOST_BRIDGE, 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 */ |
| reg32 = MCHBAR32(SAPMCTL); |
| reg32 |= (1 << 9) | (1 << 10); |
| MCHBAR32(SAPMCTL) = reg32; |
| |
| /* Enable SA Clock Gating */ |
| reg32 = MCHBAR32(SAPMCTL); |
| MCHBAR32(SAPMCTL) = reg32 | 1; |
| |
| /* GPU RC6 workaround for sighting 366252 */ |
| reg32 = MCHBAR32(SSKPD_HI); |
| reg32 |= (1 << 31); |
| MCHBAR32(SSKPD_HI) = reg32; |
| |
| /* VLW (Virtual Legacy Wire?) */ |
| reg32 = MCHBAR32(0x6120); |
| reg32 &= ~(1 << 0); |
| MCHBAR32(0x6120) = reg32; |
| |
| reg32 = MCHBAR32(INTRDIRCTL); |
| reg32 |= (1 << 4) | (1 << 5); |
| MCHBAR32(INTRDIRCTL) = reg32; |
| } |
| |
| static void start_peg_link_training(void) |
| { |
| u32 tmp, deven; |
| |
| const u16 base_rev = pci_read_config16(HOST_BRIDGE, PCI_DEVICE_ID) & BASE_REV_MASK; |
| /* |
| * PEG on IvyBridge+ needs a special startup sequence. |
| * As the MRC has its own initialization code skip it. |
| */ |
| if ((base_rev != BASE_REV_IVB) || CONFIG(HAVE_MRC)) |
| return; |
| |
| deven = pci_read_config32(HOST_BRIDGE, DEVEN); |
| |
| /* |
| * For each PEG device, set bit 5 to use three retries for OC (Offset Calibration). |
| * We also clear DEFER_OC (bit 16) in order to start PEG training. |
| */ |
| if (deven & DEVEN_PEG10) { |
| tmp = pci_read_config32(PCI_DEV(0, 1, 0), AFE_PWRON) & ~(1 << 16); |
| pci_write_config32(PCI_DEV(0, 1, 0), AFE_PWRON, tmp | (1 << 5)); |
| } |
| |
| if (deven & DEVEN_PEG11) { |
| tmp = pci_read_config32(PCI_DEV(0, 1, 1), AFE_PWRON) & ~(1 << 16); |
| pci_write_config32(PCI_DEV(0, 1, 1), AFE_PWRON, tmp | (1 << 5)); |
| } |
| |
| if (deven & DEVEN_PEG12) { |
| tmp = pci_read_config32(PCI_DEV(0, 1, 2), AFE_PWRON) & ~(1 << 16); |
| pci_write_config32(PCI_DEV(0, 1, 2), AFE_PWRON, tmp | (1 << 5)); |
| } |
| |
| if (deven & DEVEN_PEG60) { |
| tmp = pci_read_config32(PCI_DEV(0, 6, 0), AFE_PWRON) & ~(1 << 16); |
| pci_write_config32(PCI_DEV(0, 6, 0), AFE_PWRON, tmp | (1 << 5)); |
| } |
| } |
| |
| void systemagent_early_init(void) |
| { |
| u32 capid0_a; |
| u32 deven; |
| u8 reg8; |
| |
| /* Device ID Override Enable should be done very early */ |
| capid0_a = pci_read_config32(HOST_BRIDGE, CAPID0_A); |
| if (capid0_a & (1 << 10)) { |
| const size_t is_mobile = get_platform_type() == PLATFORM_MOBILE; |
| |
| reg8 = pci_read_config8(HOST_BRIDGE, DIDOR); |
| reg8 &= ~7; /* Clear 2:0 */ |
| |
| if (is_mobile) |
| reg8 |= 1; /* Set bit 0 */ |
| |
| pci_write_config8(HOST_BRIDGE, DIDOR, reg8); |
| } |
| |
| /* Setup all BARs required for early PCIe and raminit */ |
| sandybridge_setup_bars(); |
| |
| /* Set C0000-FFFFF to access RAM on both reads and writes */ |
| enable_pam_region(); |
| |
| /* Setup IOMMU BARs */ |
| systemagent_vtd_init(); |
| |
| /* Device Enable, don't touch PEG bits */ |
| deven = pci_read_config32(HOST_BRIDGE, DEVEN) | DEVEN_IGD; |
| pci_write_config32(HOST_BRIDGE, DEVEN, deven); |
| |
| sandybridge_setup_graphics(); |
| |
| /* |
| * Write magic values to start PEG link training. This should be done in PCI device |
| * enumeration, but the PCIe specification requires to wait at least 100msec after |
| * reset for devices to come up. As we don't want to increase boot time, enable it |
| * early and assume that PEG is up as soon as PCI enumeration starts. |
| * |
| * TODO: use timestamps to ensure the timings are met. |
| */ |
| start_peg_link_training(); |
| } |
| |
| void northbridge_romstage_finalize(int s3resume) |
| { |
| MCHBAR16(SSKPD_HI) = 0xCAFE; |
| |
| romstage_handoff_init(s3resume); |
| } |