diff options
Diffstat (limited to 'src/soc/intel/braswell/romstage/romstage.c')
| -rw-r--r-- | src/soc/intel/braswell/romstage/romstage.c | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/src/soc/intel/braswell/romstage/romstage.c b/src/soc/intel/braswell/romstage/romstage.c new file mode 100644 index 0000000000..9c8bbc40ce --- /dev/null +++ b/src/soc/intel/braswell/romstage/romstage.c @@ -0,0 +1,377 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <stddef.h> +#include <arch/cpu.h> +#include <arch/io.h> +#include <arch/stages.h> +#include <arch/early_variables.h> +#include <console/console.h> +#include <cbfs.h> +#include <cbmem.h> +#include <cpu/x86/mtrr.h> +#if CONFIG_EC_GOOGLE_CHROMEEC +#include <ec/google/chromeec/ec.h> +#endif +#include <elog.h> +#include <romstage_handoff.h> +#include <stage_cache.h> +#include <timestamp.h> +#include <vendorcode/google/chromeos/chromeos.h> +#include <soc/gpio.h> +#include <soc/iomap.h> +#include <soc/lpc.h> +#include <soc/pci_devs.h> +#include <soc/pmc.h> +#include <soc/reset.h> +#include <soc/romstage.h> +#include <soc/smm.h> +#include <soc/spi.h> + +/* The cache-as-ram assembly file calls romstage_main() after setting up + * cache-as-ram. romstage_main() will then call the mainboards's + * mainboard_romstage_entry() function. That function then calls + * romstage_common() below. The reason for the back and forth is to provide + * common entry point from cache-as-ram while still allowing for code sharing. + * Because we can't use global variables the stack is used for allocations -- + * thus the need to call back and forth. */ + +static void *setup_stack_and_mttrs(void); + +static void program_base_addresses(void) +{ + uint32_t reg; + const uint32_t lpc_dev = PCI_DEV(0, LPC_DEV, LPC_FUNC); + + /* Memory Mapped IO registers. */ + reg = PMC_BASE_ADDRESS | 2; + pci_write_config32(lpc_dev, PBASE, reg); + reg = IO_BASE_ADDRESS | 2; + pci_write_config32(lpc_dev, IOBASE, reg); + reg = ILB_BASE_ADDRESS | 2; + pci_write_config32(lpc_dev, IBASE, reg); + reg = SPI_BASE_ADDRESS | 2; + pci_write_config32(lpc_dev, SBASE, reg); + reg = MPHY_BASE_ADDRESS | 2; + pci_write_config32(lpc_dev, MPBASE, reg); + reg = PUNIT_BASE_ADDRESS | 2; + pci_write_config32(lpc_dev, PUBASE, reg); + reg = RCBA_BASE_ADDRESS | 1; + pci_write_config32(lpc_dev, RCBA, reg); + + /* IO Port Registers. */ + reg = ACPI_BASE_ADDRESS | 2; + pci_write_config32(lpc_dev, ABASE, reg); + reg = GPIO_BASE_ADDRESS | 2; + pci_write_config32(lpc_dev, GBASE, reg); +} + +static void spi_init(void) +{ + u32 *scs = (u32 *)(SPI_BASE_ADDRESS + SCS); + u32 *bcr = (u32 *)(SPI_BASE_ADDRESS + BCR); + uint32_t reg; + + /* Disable generating SMI when setting WPD bit. */ + write32(scs, read32(scs) & ~SMIWPEN); + /* + * Enable caching and prefetching in the SPI controller. Disable + * the SMM-only BIOS write and set WPD bit. + */ + reg = (read32(bcr) & ~SRC_MASK) | SRC_CACHE_PREFETCH | BCR_WPD; + reg &= ~EISS; + write32(bcr, reg); +} + +/* Entry from cache-as-ram.inc. */ +void * asmlinkage romstage_main(unsigned long bist, + uint32_t tsc_low, uint32_t tsc_hi) +{ + struct romstage_params rp = { + .bist = bist, + .mrc_params = NULL, + }; + + /* Save initial timestamp from bootblock. */ + timestamp_init((((uint64_t)tsc_hi) << 32) | (uint64_t)tsc_low); + + /* Save romstage begin */ + timestamp_add_now(TS_START_ROMSTAGE); + + program_base_addresses(); + + tco_disable(); + + byt_config_com1_and_enable(); + + console_init(); + + spi_init(); + + set_max_freq(); + + punit_init(); + + gfx_init(); + +#if CONFIG_EC_GOOGLE_CHROMEEC + /* Ensure the EC is in the right mode for recovery */ + google_chromeec_early_init(); +#endif + + /* Call into mainboard. */ + mainboard_romstage_entry(&rp); + + return setup_stack_and_mttrs(); +} + +static struct chipset_power_state power_state CAR_GLOBAL; + +static void migrate_power_state(void) +{ + struct chipset_power_state *ps_cbmem; + struct chipset_power_state *ps_car; + + ps_car = car_get_var_ptr(&power_state); + ps_cbmem = cbmem_add(CBMEM_ID_POWER_STATE, sizeof(*ps_cbmem)); + + if (ps_cbmem == NULL) { + printk(BIOS_DEBUG, "Not adding power state to cbmem!\n"); + return; + } + memcpy(ps_cbmem, ps_car, sizeof(*ps_cbmem)); +} +CAR_MIGRATE(migrate_power_state); + +static struct chipset_power_state *fill_power_state(void) +{ + struct chipset_power_state *ps = car_get_var_ptr(&power_state); + + ps->pm1_sts = inw(ACPI_BASE_ADDRESS + PM1_STS); + ps->pm1_en = inw(ACPI_BASE_ADDRESS + PM1_EN); + ps->pm1_cnt = inl(ACPI_BASE_ADDRESS + PM1_CNT); + ps->gpe0_sts = inl(ACPI_BASE_ADDRESS + GPE0_STS); + ps->gpe0_en = inl(ACPI_BASE_ADDRESS + GPE0_EN); + ps->tco_sts = inl(ACPI_BASE_ADDRESS + TCO_STS); + ps->prsts = read32((u32 *)(PMC_BASE_ADDRESS + PRSTS)); + ps->gen_pmcon1 = read32((u32 *)(PMC_BASE_ADDRESS + GEN_PMCON1)); + ps->gen_pmcon2 = read32((u32 *)(PMC_BASE_ADDRESS + GEN_PMCON2)); + + printk(BIOS_DEBUG, "pm1_sts: %04x pm1_en: %04x pm1_cnt: %08x\n", + ps->pm1_sts, ps->pm1_en, ps->pm1_cnt); + printk(BIOS_DEBUG, "gpe0_sts: %08x gpe0_en: %08x tco_sts: %08x\n", + ps->gpe0_sts, ps->gpe0_en, ps->tco_sts); + printk(BIOS_DEBUG, "prsts: %08x gen_pmcon1: %08x gen_pmcon2: %08x\n", + ps->prsts, ps->gen_pmcon1, ps->gen_pmcon2); + + return ps; +} + +/* Return 0, 3, or 5 to indicate the previous sleep state. */ +static int chipset_prev_sleep_state(struct chipset_power_state *ps) +{ + /* Default to S0. */ + int prev_sleep_state = 0; + + if (ps->pm1_sts & WAK_STS) { + switch ((ps->pm1_cnt & SLP_TYP) >> SLP_TYP_SHIFT) { + #if CONFIG_HAVE_ACPI_RESUME + case SLP_TYP_S3: + prev_sleep_state = 3; + break; + #endif + case SLP_TYP_S5: + prev_sleep_state = 5; + break; + } + /* Clear SLP_TYP. */ + outl(ps->pm1_cnt & ~(SLP_TYP), ACPI_BASE_ADDRESS + PM1_CNT); + } + + if (ps->gen_pmcon1 & (PWR_FLR | SUS_PWR_FLR)) { + prev_sleep_state = 5; + } + + return prev_sleep_state; +} + +static inline void chromeos_init(int prev_sleep_state) +{ +#if CONFIG_CHROMEOS + /* Normalize the sleep state to what init_chromeos() wants for S3: 2. */ + init_chromeos(prev_sleep_state == 3 ? 2 : 0); +#endif +} + +/* Entry from the mainboard. */ +void romstage_common(struct romstage_params *params) +{ + struct romstage_handoff *handoff; + struct chipset_power_state *ps; + int prev_sleep_state; + + timestamp_add_now(TS_BEFORE_INITRAM); + + ps = fill_power_state(); + prev_sleep_state = chipset_prev_sleep_state(ps); + + printk(BIOS_DEBUG, "prev_sleep_state = S%d\n", prev_sleep_state); + +#if CONFIG_ELOG_BOOT_COUNT + if (prev_sleep_state != 3) + boot_count_increment(); +#endif + + + /* Initialize RAM */ + raminit(params->mrc_params, prev_sleep_state); + + timestamp_add_now(TS_AFTER_INITRAM); + + handoff = romstage_handoff_find_or_add(); + if (handoff != NULL) + handoff->s3_resume = (prev_sleep_state == 3); + else + printk(BIOS_DEBUG, "Romstage handoff structure not added!\n"); + + chromeos_init(prev_sleep_state); +} + +void asmlinkage romstage_after_car(void) +{ + timestamp_add_now(TS_END_ROMSTAGE); + + /* Load the ramstage. */ + copy_and_run(); + while (1); +} + +static inline uint32_t *stack_push(u32 *stack, u32 value) +{ + stack = &stack[-1]; + *stack = value; + return stack; +} + +/* Romstage needs quite a bit of stack for decompressing images since the lzma + * lib keeps its state on the stack during romstage. */ +static unsigned long choose_top_of_stack(void) +{ + unsigned long stack_top; + const unsigned long romstage_ram_stack_size = 0x5000; + + /* cbmem_add() does a find() before add(). */ + stack_top = (unsigned long)cbmem_add(CBMEM_ID_ROMSTAGE_RAM_STACK, + romstage_ram_stack_size); + stack_top += romstage_ram_stack_size; + return stack_top; +} + +/* setup_stack_and_mttrs() determines the stack to use after + * cache-as-ram is torn down as well as the MTRR settings to use. */ +static void *setup_stack_and_mttrs(void) +{ + unsigned long top_of_stack; + int num_mtrrs; + uint32_t *slot; + uint32_t mtrr_mask_upper; + uint32_t top_of_ram; + + /* Top of stack needs to be aligned to a 4-byte boundary. */ + top_of_stack = choose_top_of_stack() & ~3; + slot = (void *)top_of_stack; + num_mtrrs = 0; + + /* The upper bits of the MTRR mask need to set according to the number + * of physical address bits. */ + mtrr_mask_upper = (1 << ((cpuid_eax(0x80000008) & 0xff) - 32)) - 1; + + /* The order for each MTRR is value then base with upper 32-bits of + * each value coming before the lower 32-bits. The reasoning for + * this ordering is to create a stack layout like the following: + * +0: Number of MTRRs + * +4: MTRR base 0 31:0 + * +8: MTRR base 0 63:32 + * +12: MTRR mask 0 31:0 + * +16: MTRR mask 0 63:32 + * +20: MTRR base 1 31:0 + * +24: MTRR base 1 63:32 + * +28: MTRR mask 1 31:0 + * +32: MTRR mask 1 63:32 + */ + + /* Cache the ROM as WP just below 4GiB. */ + slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ + slot = stack_push(slot, ~(CONFIG_ROM_SIZE - 1) | MTRRphysMaskValid); + slot = stack_push(slot, 0); /* upper base */ + slot = stack_push(slot, ~(CONFIG_ROM_SIZE - 1) | MTRR_TYPE_WRPROT); + num_mtrrs++; + + /* Cache RAM as WB from 0 -> CONFIG_RAMTOP. */ + slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ + slot = stack_push(slot, ~(CONFIG_RAMTOP - 1) | MTRRphysMaskValid); + slot = stack_push(slot, 0); /* upper base */ + slot = stack_push(slot, 0 | MTRR_TYPE_WRBACK); + num_mtrrs++; + + top_of_ram = (uint32_t)cbmem_top(); + /* Cache 8MiB below the top of ram. The top of ram under 4GiB is the + * start of the TSEG region. It is required to be 8MiB aligned. Set + * this area as cacheable so it can be used later for ramstage before + * setting up the entire RAM as cacheable. */ + slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ + slot = stack_push(slot, ~((8 << 20) - 1) | MTRRphysMaskValid); + slot = stack_push(slot, 0); /* upper base */ + slot = stack_push(slot, (top_of_ram - (8 << 20)) | MTRR_TYPE_WRBACK); + num_mtrrs++; + + /* Cache 8MiB at the top of ram. Top of ram is where the TSEG + * region resides. However, it is not restricted to SMM mode until + * SMM has been relocated. By setting the region to cacheable it + * provides faster access when relocating the SMM handler as well + * as using the TSEG region for other purposes. */ + slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ + slot = stack_push(slot, ~((8 << 20) - 1) | MTRRphysMaskValid); + slot = stack_push(slot, 0); /* upper base */ + slot = stack_push(slot, top_of_ram | MTRR_TYPE_WRBACK); + num_mtrrs++; + + /* Save the number of MTRRs to setup. Return the stack location + * pointing to the number of MTRRs. */ + slot = stack_push(slot, num_mtrrs); + + return slot; +} + +void ramstage_cache_invalid(void) +{ +#if CONFIG_RESET_ON_INVALID_RAMSTAGE_CACHE + /* Perform cold reset on invalid ramstage cache. */ + cold_reset(); +#endif +} + +#if CONFIG_CHROMEOS +int vboot_get_sw_write_protect(void) +{ + u8 status; + /* Return unprotected status if status read fails. */ + return (early_spi_read_wpsr(&status) ? 0 : !!(status & 0x80)); +} +#endif |