diff options
| -rw-r--r-- | arch/x86/cpu/coreboot/coreboot.c | 3 | ||||
| -rw-r--r-- | arch/x86/cpu/start.S | 4 | ||||
| -rw-r--r-- | arch/x86/include/asm/post.h | 32 | ||||
| -rw-r--r-- | board/google/chromebook_link/Kconfig | 4 | ||||
| -rw-r--r-- | board/google/common/early_init.S | 21 |
5 files changed, 62 insertions, 2 deletions
diff --git a/arch/x86/cpu/coreboot/coreboot.c b/arch/x86/cpu/coreboot/coreboot.c index 85017165c0..0760a61d84 100644 --- a/arch/x86/cpu/coreboot/coreboot.c +++ b/arch/x86/cpu/coreboot/coreboot.c @@ -15,6 +15,7 @@ #include <asm/cache.h> #include <asm/cpu.h> #include <asm/io.h> +#include <asm/post.h> #include <asm/arch-coreboot/tables.h> #include <asm/arch-coreboot/sysinfo.h> #include <asm/arch/timestamp.h> @@ -70,7 +71,7 @@ void show_boot_progress(int val) gd->arch.tsc_prev = now; } #endif - outb(val, 0x80); + outb(val, POST_PORT); } int print_cpuinfo(void) diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S index b18f3201bc..1b738f9916 100644 --- a/arch/x86/cpu/start.S +++ b/arch/x86/cpu/start.S @@ -13,6 +13,7 @@ #include <config.h> #include <version.h> #include <asm/global_data.h> +#include <asm/post.h> #include <asm/processor.h> #include <asm/processor-flags.h> #include <generated/generic-asm-offsets.h> @@ -67,6 +68,7 @@ _start: jmp early_board_init .globl early_board_init_ret early_board_init_ret: + post_code(POST_START) /* Initialise Cache-As-RAM */ jmp car_init @@ -96,6 +98,7 @@ car_init_ret: /* Align global data to 16-byte boundary */ andl $0xfffffff0, %esp + post_code(POST_START_STACK) /* Zero the global data since it won't happen later */ xorl %eax, %eax @@ -131,6 +134,7 @@ car_init_ret: call setup_gdt /* Set parameter to board_init_f() to boot flags */ + post_code(POST_START_DONE) xorl %eax, %eax /* Enter, U-boot! */ diff --git a/arch/x86/include/asm/post.h b/arch/x86/include/asm/post.h new file mode 100644 index 0000000000..33711854af --- /dev/null +++ b/arch/x86/include/asm/post.h @@ -0,0 +1,32 @@ +/* + * Copyright (c) 2014 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _post_h +#define _post_h + +/* port to use for post codes */ +#define POST_PORT 0x80 + +/* post codes which represent various stages of init */ +#define POST_START 0x1e +#define POST_CAR_START 0x1f + +#define POST_START_STACK 0x29 +#define POST_START_DONE 0x2a + +/* Output a post code using al - value must be 0 to 0xff */ +#ifdef __ASSEMBLY__ +#define post_code(value) \ + movb $value, %al; \ + outb %al, $POST_PORT +#else +static inline void post_code(int code) +{ + outb(code, POST_PORT); +} +#endif + +#endif diff --git a/board/google/chromebook_link/Kconfig b/board/google/chromebook_link/Kconfig index 975d557e1c..9c715ba765 100644 --- a/board/google/chromebook_link/Kconfig +++ b/board/google/chromebook_link/Kconfig @@ -12,4 +12,8 @@ config SYS_SOC config SYS_CONFIG_NAME default "chromebook_link" +config EARLY_POST_CROS_EC + bool "Enable early post to Chrome OS EC" + default y + endif diff --git a/board/google/common/early_init.S b/board/google/common/early_init.S index cf70ae40c6..7017185d06 100644 --- a/board/google/common/early_init.S +++ b/board/google/common/early_init.S @@ -6,5 +6,24 @@ .globl early_board_init early_board_init: - /* No 32-bit board specific initialisation */ + /* Enable post codes to EC */ +#ifdef CONFIG_EARLY_POST_CROS_EC + mov $0x1b, %ecx + rdmsr + and $0x100, %eax + test %eax, %eax + je 1f + + mov $0x8000f8f0, %eax + mov $0xcf8, %dx + out %eax, (%dx) + mov $0xfed1c001, %eax + mov $0xcfc, %dx + out %eax, (%dx) + mov $0xfed1f410, %esp + mov (%esp), %eax + and $0xfffffffb, %eax + mov %eax, (%esp) +1: +#endif jmp early_board_init_ret |
