diff options
Diffstat (limited to 'board/nocturne_fp/ro_workarounds.c')
| -rw-r--r-- | board/nocturne_fp/ro_workarounds.c | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/board/nocturne_fp/ro_workarounds.c b/board/nocturne_fp/ro_workarounds.c deleted file mode 100644 index e980d14877..0000000000 --- a/board/nocturne_fp/ro_workarounds.c +++ /dev/null @@ -1,115 +0,0 @@ -/* Copyright 2020 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -/* A place to organize workarounds for legacy RO */ - -#include <assert.h> -#include <stdbool.h> - -#include "bkpdata.h" -#include "common.h" -#include "console.h" -#include "ec_commands.h" /* Reset cause */ -#include "gpio.h" -#include "hooks.h" -#include "system.h" -#include "task.h" -#include "watchdog.h" - -/* Console output macros */ -#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ## args) - -/* - * We only patch RW to ensure that future ROs have correct behavior. - */ -#if defined(APPLY_RESET_LOOP_FIX) && defined(SECTION_IS_RW) - -/* - * Add in ap-off flag to be able to detect on next boot. - * No other code in this build uses this ap-off reset flag. - */ -#define FORGE_PORFLAG_FLAGS (EC_RESET_FLAG_POWER_ON|EC_RESET_FLAG_AP_OFF) - -static void wp_change_deferred(void) -{ - /* - * The normal state of the reset backup register is 0, but - * we know that our override version of bkpdata_write_reset_flags - * will adjust it based on GPIO_WP's status. - */ - bkpdata_write_reset_flags(0); -} -DECLARE_DEFERRED(wp_change_deferred); - -/* - * We respond to changes in the hardware write protect line in order to - * ensure this workaround is installed when it is needed and uninstalled - * when it is not needed. This ensures that we are protected during - * unexpected resets, such as pin resets or double faults. - * - * Furthermore, installing and uninstalling when needed minimizes the - * difference between our normal operating conditions and normal operating - * conditions with this ro_workaround source being included. That is to say, - * the system behavior is only altered in the less likely state, when hardware - * write protect deasserted. - */ -void wp_event(enum gpio_signal signal) -{ - /* - * We must use a deferred function to call bkpdata_write_reset_flags, - * since the underlying bkpdata_write uses a mutex. - */ - hook_call_deferred(&wp_change_deferred_data, 0); -} - -/* - * We intercept all changes to the reset backup register to ensure that - * our reset loop patch stays in place. - * - * This function will be called once in check_reset_cause during - * startup, which ensures proper behavior even when unexpected - * resets occurs (pin reset or exception). - * - * This function is also called from system_reset to set the final save - * reset flags, before an actual planned reset. - */ -__override -void bkpdata_write_reset_flags(uint32_t save_flags) -{ - /* Preserve flags in case a reset pulse occurs */ - if (!gpio_get_level(GPIO_WP)) - save_flags |= FORGE_PORFLAG_FLAGS; - - bkpdata_write(BKPDATA_INDEX_SAVED_RESET_FLAGS, save_flags & 0xffff); - bkpdata_write(BKPDATA_INDEX_SAVED_RESET_FLAGS_2, save_flags >> 16); -} - -/* - * We do not need to explicitly invoke bkpdata_write_reset_flags - * on boot, since check_reset_cause will already invoke it once on boot. - */ -static void board_init_workarounds(void) -{ - gpio_disable_interrupt(GPIO_WP); - gpio_clear_pending_interrupt(GPIO_WP); - - /* - * Detect our forged power-on flag and correct the current - * system reset flags. - * This does not ensure that all init functions will see - * the corrected system reset flags, so care should be taken. - */ - if ((system_get_reset_flags() & FORGE_PORFLAG_FLAGS) == - FORGE_PORFLAG_FLAGS) { - CPRINTS("WARNING: Reset flags power-on + ap-off were forged."); - system_clear_reset_flags(FORGE_PORFLAG_FLAGS); - } - - gpio_enable_interrupt(GPIO_WP); -} -/* Run one priority level higher than the main board_init in board.c */ -DECLARE_HOOK(HOOK_INIT, board_init_workarounds, HOOK_PRIO_DEFAULT - 1); - -#endif /* APPLY_RESET_LOOP_FIX && SECTION_IS_RW */ |