| /* |
| * 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/cbfs.h> |
| #include <arch/stages.h> |
| #include <console/console.h> |
| #include <cbmem.h> |
| #include <cpu/x86/mtrr.h> |
| #include <romstage_handoff.h> |
| #include <baytrail/gpio.h> |
| #include <baytrail/iomap.h> |
| #include <baytrail/iosf.h> |
| #include <baytrail/lpc.h> |
| #include <baytrail/pci_devs.h> |
| #include <baytrail/romstage.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 = 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); |
| } |
| |
| /* Entry from cache-as-ram.inc. */ |
| void * asmlinkage romstage_main(unsigned long bist) |
| { |
| /* Call into mainboard. */ |
| mainboard_romstage_entry(bist); |
| |
| return setup_stack_and_mttrs(); |
| } |
| |
| /* Entry from the mainboard. */ |
| void romstage_common(const struct romstage_params *params) |
| { |
| struct romstage_handoff *handoff; |
| |
| program_base_addresses(); |
| |
| byt_config_com1_and_enable(); |
| |
| console_init(); |
| |
| gfx_init(); |
| |
| /* Initialize RAM */ |
| raminit(params->mrc_params, 5); |
| |
| handoff = romstage_handoff_find_or_add(); |
| if (handoff != NULL) |
| handoff->s3_resume = 0; |
| else |
| printk(BIOS_DEBUG, "Romstage handoff structure not added!\n"); |
| |
| } |
| |
| static void open_up_spi(void) |
| { |
| const uintptr_t sbase = SPI_BASE_ADDRESS; |
| |
| /* Disable generating SMI when setting WPD bit. */ |
| write32(sbase + 0xf8, read32(sbase + 0xf8) & ~(1 << 7)); |
| /* Disable the SMM-only BIOS write and set WPD bit. */ |
| write32(sbase + 0xfc, 1 | (read32(sbase + 0xfc) & ~(1 << 5))); |
| } |
| |
| void asmlinkage romstage_after_car(void) |
| { |
| /* Allow BIOS to program SPI part. */ |
| open_up_spi(); |
| |
| /* 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; |
| } |