From 7cced0d20e44c1bbcd0b5d4aced53c682fcd23fc Mon Sep 17 00:00:00 2001 From: Duncan Laurie Date: Tue, 4 Jun 2013 10:03:34 -0700 Subject: [PATCH] ec: Add romstage function for checking and rebooting EC Now that we are executing VbInit() in coreboot we can end up in a situation where the recovery reason is consumed during VbInit (end of romstage) and then the EC is rebooted to RO during ramstage EC init, thereby losing the recovery reason. Two possiblities are to remove the EC check+reboot from ramstage and let it happen in depthcharge. This however means that the system has to boot all the way into depthcharge and then reboot the EC and the system again. Instead if we do a check in romstage before VbInit() is called then we can reboot the EC into RO early and avoid booting all the way to depthcharge first. This change adds a ramstage version the EC init function and calls it from the shared romstage code immediately after the PCH decode windows are setup. Change-Id: I30d2a0c7131b8e4ec30c63eea36944ec111a8fba Signed-off-by: Duncan Laurie Reviewed-on: http://review.coreboot.org/3744 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/cpu/intel/haswell/romstage.c | 8 +++++++ src/ec/google/chromeec/ec.c | 39 ++++++++++++++++++++++++++++++-- src/ec/google/chromeec/ec.h | 1 + 3 files changed, 46 insertions(+), 2 deletions(-) diff --git a/src/cpu/intel/haswell/romstage.c b/src/cpu/intel/haswell/romstage.c index 8196273195..0cef888b49 100644 --- a/src/cpu/intel/haswell/romstage.c +++ b/src/cpu/intel/haswell/romstage.c @@ -38,6 +38,9 @@ #if CONFIG_CHROMEOS #include #endif +#if CONFIG_EC_GOOGLE_CHROMEEC +#include +#endif #include "haswell.h" #include "northbridge/intel/haswell/haswell.h" #include "northbridge/intel/haswell/raminit.h" @@ -216,6 +219,11 @@ void romstage_common(const struct romstage_params *params) wake_from_s3 = early_pch_init(params->gpio_map, params->rcba_config); +#if CONFIG_EC_GOOGLE_CHROMEEC + /* Ensure the EC is in the right mode for recovery */ + google_chromeec_early_init(); +#endif + /* Halt if there was a built in self test failure */ report_bist_failure(params->bist); diff --git a/src/ec/google/chromeec/ec.c b/src/ec/google/chromeec/ec.c index d94338fa18..9b848c06c2 100644 --- a/src/ec/google/chromeec/ec.c +++ b/src/ec/google/chromeec/ec.c @@ -21,12 +21,12 @@ #include #include #include +#include +#include #ifndef __PRE_RAM__ #include #include #include -#include -#include #include "chip.h" #endif #include "ec.h" @@ -99,6 +99,41 @@ u32 google_chromeec_get_events_b(void) return google_chromeec_get_mask(EC_CMD_HOST_EVENT_GET_B); } +#ifndef __SMM__ +/* Check for recovery mode and ensure EC is in RO */ +void google_chromeec_early_init(void) +{ + struct chromeec_command cec_cmd; + struct ec_response_get_version cec_resp = {{0}}; + + cec_cmd.cmd_code = EC_CMD_GET_VERSION; + cec_cmd.cmd_version = 0; + cec_cmd.cmd_data_out = &cec_resp; + cec_cmd.cmd_size_in = 0; + cec_cmd.cmd_size_out = sizeof(cec_resp); + google_chromeec_command(&cec_cmd); + + if (cec_cmd.cmd_code || + (recovery_mode_enabled() && + (cec_resp.current_image != EC_IMAGE_RO))) { + struct ec_params_reboot_ec reboot_ec; + /* Reboot the EC and make it come back in RO mode */ + reboot_ec.cmd = EC_REBOOT_COLD; + reboot_ec.flags = 0; + cec_cmd.cmd_code = EC_CMD_REBOOT_EC; + cec_cmd.cmd_version = 0; + cec_cmd.cmd_data_in = &reboot_ec; + cec_cmd.cmd_size_in = sizeof(reboot_ec); + cec_cmd.cmd_size_out = 0; /* ignore response, if any */ + printk(BIOS_DEBUG, "Rebooting with EC in RO mode:\n"); + google_chromeec_command(&cec_cmd); + udelay(1000); + hard_reset(); + hlt(); + } +} +#endif /* ! __SMM__ */ + #ifndef __PRE_RAM__ static int google_chromeec_set_mask(u8 type, u32 mask) diff --git a/src/ec/google/chromeec/ec.h b/src/ec/google/chromeec/ec.h index 3eb555c103..7679a8bcc6 100644 --- a/src/ec/google/chromeec/ec.h +++ b/src/ec/google/chromeec/ec.h @@ -33,6 +33,7 @@ u16 google_chromeec_get_board_version(void); void google_chromeec_init(void); #endif +void google_chromeec_early_init(void); uint8_t google_chromeec_calc_checksum(const uint8_t *data, int size); u32 google_chromeec_get_events_b(void); int google_chromeec_kbbacklight(int percent);