diff options
Diffstat (limited to 'arch/x86/cpu/ivybridge/cpu.c')
| -rw-r--r-- | arch/x86/cpu/ivybridge/cpu.c | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/arch/x86/cpu/ivybridge/cpu.c b/arch/x86/cpu/ivybridge/cpu.c new file mode 100644 index 0000000000..60976db44d --- /dev/null +++ b/arch/x86/cpu/ivybridge/cpu.c @@ -0,0 +1,357 @@ +/* + * Copyright (c) 2014 Google, Inc + * (C) Copyright 2008 + * Graeme Russ, graeme.russ@gmail.com. + * + * Some portions from coreboot src/mainboard/google/link/romstage.c + * and src/cpu/intel/model_206ax/bootblock.c + * Copyright (C) 2007-2010 coresystems GmbH + * Copyright (C) 2011 Google Inc. + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <errno.h> +#include <fdtdec.h> +#include <asm/cpu.h> +#include <asm/io.h> +#include <asm/lapic.h> +#include <asm/msr.h> +#include <asm/mtrr.h> +#include <asm/pci.h> +#include <asm/post.h> +#include <asm/processor.h> +#include <asm/arch/model_206ax.h> +#include <asm/arch/microcode.h> +#include <asm/arch/pch.h> +#include <asm/arch/sandybridge.h> + +DECLARE_GLOBAL_DATA_PTR; + +static void enable_port80_on_lpc(struct pci_controller *hose, pci_dev_t dev) +{ + /* Enable port 80 POST on LPC */ + pci_hose_write_config_dword(hose, dev, PCH_RCBA_BASE, DEFAULT_RCBA | 1); + clrbits_le32(RCB_REG(GCS), 4); +} + +/* + * Enable Prefetching and Caching. + */ +static void enable_spi_prefetch(struct pci_controller *hose, pci_dev_t dev) +{ + u8 reg8; + + pci_hose_read_config_byte(hose, dev, 0xdc, ®8); + reg8 &= ~(3 << 2); + reg8 |= (2 << 2); /* Prefetching and Caching Enabled */ + pci_hose_write_config_byte(hose, dev, 0xdc, reg8); +} + +static void set_var_mtrr( + unsigned reg, unsigned base, unsigned size, unsigned type) + +{ + /* Bit Bit 32-35 of MTRRphysMask should be set to 1 */ + /* FIXME: It only support 4G less range */ + wrmsr(MTRRphysBase_MSR(reg), base | type, 0); + wrmsr(MTRRphysMask_MSR(reg), ~(size - 1) | MTRRphysMaskValid, + (1 << (CONFIG_CPU_ADDR_BITS - 32)) - 1); +} + +static void enable_rom_caching(void) +{ + disable_caches(); + set_var_mtrr(1, 0xffc00000, 4 << 20, MTRR_TYPE_WRPROT); + enable_caches(); + + /* Enable Variable MTRRs */ + wrmsr(MTRRdefType_MSR, 0x800, 0); +} + +static int set_flex_ratio_to_tdp_nominal(void) +{ + msr_t flex_ratio, msr; + u8 nominal_ratio; + + /* Minimum CPU revision for configurable TDP support */ + if (cpuid_eax(1) < IVB_CONFIG_TDP_MIN_CPUID) + return -EINVAL; + + /* Check for Flex Ratio support */ + flex_ratio = msr_read(MSR_FLEX_RATIO); + if (!(flex_ratio.lo & FLEX_RATIO_EN)) + return -EINVAL; + + /* Check for >0 configurable TDPs */ + msr = msr_read(MSR_PLATFORM_INFO); + if (((msr.hi >> 1) & 3) == 0) + return -EINVAL; + + /* Use nominal TDP ratio for flex ratio */ + msr = msr_read(MSR_CONFIG_TDP_NOMINAL); + nominal_ratio = msr.lo & 0xff; + + /* See if flex ratio is already set to nominal TDP ratio */ + if (((flex_ratio.lo >> 8) & 0xff) == nominal_ratio) + return 0; + + /* Set flex ratio to nominal TDP ratio */ + flex_ratio.lo &= ~0xff00; + flex_ratio.lo |= nominal_ratio << 8; + flex_ratio.lo |= FLEX_RATIO_LOCK; + msr_write(MSR_FLEX_RATIO, flex_ratio); + + /* Set flex ratio in soft reset data register bits 11:6 */ + clrsetbits_le32(RCB_REG(SOFT_RESET_DATA), 0x3f << 6, + (nominal_ratio & 0x3f) << 6); + + /* Set soft reset control to use register value */ + setbits_le32(RCB_REG(SOFT_RESET_CTRL), 1); + + /* Issue warm reset, will be "CPU only" due to soft reset data */ + outb(0x0, PORT_RESET); + outb(0x6, PORT_RESET); + cpu_hlt(); + + /* Not reached */ + return -EINVAL; +} + +static void set_spi_speed(void) +{ + u32 fdod; + + /* Observe SPI Descriptor Component Section 0 */ + writel(0x1000, RCB_REG(SPI_DESC_COMP0)); + + /* Extract the1 Write/Erase SPI Frequency from descriptor */ + fdod = readl(RCB_REG(SPI_FREQ_WR_ERA)); + fdod >>= 24; + fdod &= 7; + + /* Set Software Sequence frequency to match */ + clrsetbits_8(RCB_REG(SPI_FREQ_SWSEQ), 7, fdod); +} + +int arch_cpu_init(void) +{ + const void *blob = gd->fdt_blob; + struct pci_controller *hose; + int node; + int ret; + + post_code(POST_CPU_INIT); + timer_set_base(rdtsc()); + + ret = x86_cpu_init_f(); + if (ret) + return ret; + + ret = pci_early_init_hose(&hose); + if (ret) + return ret; + + node = fdtdec_next_compatible(blob, 0, COMPAT_INTEL_LPC); + if (node < 0) + return -ENOENT; + ret = lpc_early_init(gd->fdt_blob, node, PCH_LPC_DEV); + if (ret) + return ret; + + enable_spi_prefetch(hose, PCH_LPC_DEV); + + /* This is already done in start.S, but let's do it in C */ + enable_port80_on_lpc(hose, PCH_LPC_DEV); + + /* already done in car.S */ + if (false) + enable_rom_caching(); + + set_spi_speed(); + + /* + * We should do as little as possible before the serial console is + * up. Perhaps this should move to later. Our next lot of init + * happens in print_cpuinfo() when we have a console + */ + ret = set_flex_ratio_to_tdp_nominal(); + if (ret) + return ret; + + return 0; +} + +static int enable_smbus(void) +{ + pci_dev_t dev; + uint16_t value; + + /* Set the SMBus device statically. */ + dev = PCI_BDF(0x0, 0x1f, 0x3); + + /* Check to make sure we've got the right device. */ + value = pci_read_config16(dev, 0x0); + if (value != 0x8086) { + printf("SMBus controller not found\n"); + return -ENOSYS; + } + + /* Set SMBus I/O base. */ + pci_write_config32(dev, SMB_BASE, + SMBUS_IO_BASE | PCI_BASE_ADDRESS_SPACE_IO); + + /* Set SMBus enable. */ + pci_write_config8(dev, HOSTC, HST_EN); + + /* Set SMBus I/O space enable. */ + pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_IO); + + /* Disable interrupt generation. */ + outb(0, SMBUS_IO_BASE + SMBHSTCTL); + + /* Clear any lingering errors, so transactions can run. */ + outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT); + debug("SMBus controller enabled\n"); + + return 0; +} + +#define PCH_EHCI0_TEMP_BAR0 0xe8000000 +#define PCH_EHCI1_TEMP_BAR0 0xe8000400 +#define PCH_XHCI_TEMP_BAR0 0xe8001000 + +/* + * Setup USB controller MMIO BAR to prevent the reference code from + * resetting the controller. + * + * The BAR will be re-assigned during device enumeration so these are only + * temporary. + * + * This is used to speed up the resume path. + */ +static void enable_usb_bar(void) +{ + pci_dev_t usb0 = PCH_EHCI1_DEV; + pci_dev_t usb1 = PCH_EHCI2_DEV; + pci_dev_t usb3 = PCH_XHCI_DEV; + u32 cmd; + + /* USB Controller 1 */ + pci_write_config32(usb0, PCI_BASE_ADDRESS_0, + PCH_EHCI0_TEMP_BAR0); + cmd = pci_read_config32(usb0, PCI_COMMAND); + cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY; + pci_write_config32(usb0, PCI_COMMAND, cmd); + + /* USB Controller 1 */ + pci_write_config32(usb1, PCI_BASE_ADDRESS_0, + PCH_EHCI1_TEMP_BAR0); + cmd = pci_read_config32(usb1, PCI_COMMAND); + cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY; + pci_write_config32(usb1, PCI_COMMAND, cmd); + + /* USB3 Controller */ + pci_write_config32(usb3, PCI_BASE_ADDRESS_0, + PCH_XHCI_TEMP_BAR0); + cmd = pci_read_config32(usb3, PCI_COMMAND); + cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY; + pci_write_config32(usb3, PCI_COMMAND, cmd); +} + +static int report_bist_failure(void) +{ + if (gd->arch.bist != 0) { + printf("BIST failed: %08x\n", gd->arch.bist); + return -EFAULT; + } + + return 0; +} + +int print_cpuinfo(void) +{ + enum pei_boot_mode_t boot_mode = PEI_BOOT_NONE; + char processor_name[CPU_MAX_NAME_LEN]; + const char *name; + uint32_t pm1_cnt; + uint16_t pm1_sts; + int ret; + + /* Halt if there was a built in self test failure */ + ret = report_bist_failure(); + if (ret) + return ret; + + enable_lapic(); + + ret = microcode_update_intel(); + if (ret && ret != -ENOENT && ret != -EEXIST) + return ret; + + /* Enable upper 128bytes of CMOS */ + writel(1 << 2, RCB_REG(RC)); + + /* TODO: cmos_post_init() */ + if (readl(MCHBAR_REG(SSKPD)) == 0xCAFE) { + debug("soft reset detected\n"); + boot_mode = PEI_BOOT_SOFT_RESET; + + /* System is not happy after keyboard reset... */ + debug("Issuing CF9 warm reset\n"); + outb(0x6, 0xcf9); + cpu_hlt(); + } + + /* Early chipset init required before RAM init can work */ + sandybridge_early_init(SANDYBRIDGE_MOBILE); + + /* Check PM1_STS[15] to see if we are waking from Sx */ + pm1_sts = inw(DEFAULT_PMBASE + PM1_STS); + + /* Read PM1_CNT[12:10] to determine which Sx state */ + pm1_cnt = inl(DEFAULT_PMBASE + PM1_CNT); + + if ((pm1_sts & WAK_STS) && ((pm1_cnt >> 10) & 7) == 5) { +#if CONFIG_HAVE_ACPI_RESUME + debug("Resume from S3 detected.\n"); + boot_mode = PEI_BOOT_RESUME; + /* Clear SLP_TYPE. This will break stage2 but + * we care for that when we get there. + */ + outl(pm1_cnt & ~(7 << 10), DEFAULT_PMBASE + PM1_CNT); +#else + debug("Resume from S3 detected, but disabled.\n"); +#endif + } else { + /* + * TODO: An indication of life might be possible here (e.g. + * keyboard light) + */ + } + post_code(POST_EARLY_INIT); + + /* Enable SPD ROMs and DDR-III DRAM */ + ret = enable_smbus(); + if (ret) + return ret; + + /* Prepare USB controller early in S3 resume */ + if (boot_mode == PEI_BOOT_RESUME) + enable_usb_bar(); + + gd->arch.pei_boot_mode = boot_mode; + + /* TODO: Move this to the board or driver */ + pci_write_config32(PCH_LPC_DEV, GPIO_BASE, DEFAULT_GPIOBASE | 1); + pci_write_config32(PCH_LPC_DEV, GPIO_CNTL, 0x10); + + /* Print processor name */ + name = cpu_get_name(processor_name); + printf("CPU: %s\n", name); + + post_code(POST_CPU_INFO); + + return 0; +} |