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flashrom.c: implement chip restore callback registration

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Allows drivers to register a callback function to reset the
chip state once programming has finished. This is used by
the s25f driver added in a later patch, which needs to change
the chip's sector layout to be able to write to the entire flash.

Adapted from cros flashrom at
`9c4c9a56b6a0370b383df9c75d71b3bd469e672d`.

BUG=b:153800073
BRANCH=none
TEST=builds

Change-Id: I2a522dc1fd3952793fbcad70afc6dd43850fbbc5
Signed-off-by: Nikolai Artemiev <nartemiev@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/47276
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Nikolai Artemiev
2020-11-05 13:54:27 +11:00
committed by Edward O'Callaghan
parent 705212dac9
commit f745d0e6ab
2 changed files with 41 additions and 0 deletions
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30
flashrom.c
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@@ -580,6 +580,34 @@ int register_shutdown(int (*function) (void *data), void *data)
return 0;
}
int register_chip_restore(chip_restore_fn_cb_t func,
struct flashctx *flash, uint8_t status)
{
if (flash->chip_restore_fn_count >= MAX_CHIP_RESTORE_FUNCTIONS) {
msg_perr("Tried to register more than %i chip restore"
" functions.\n", MAX_CHIP_RESTORE_FUNCTIONS);
return 1;
}
flash->chip_restore_fn[flash->chip_restore_fn_count].func = func;
flash->chip_restore_fn[flash->chip_restore_fn_count].status = status;
flash->chip_restore_fn_count++;
return 0;
}
static int deregister_chip_restore(struct flashctx *flash)
{
int rc = 0;
while (flash->chip_restore_fn_count > 0) {
int i = --flash->chip_restore_fn_count;
rc |= flash->chip_restore_fn[i].func(
flash, flash->chip_restore_fn[i].status);
}
return rc;
}
int programmer_init(enum programmer prog, const char *param)
{
int ret;
@@ -2256,6 +2284,7 @@ int prepare_flash_access(struct flashctx *const flash,
flash->address_high_byte = -1;
flash->in_4ba_mode = false;
flash->chip_restore_fn_count = 0;
/* Be careful about 4BA chips and broken masters */
if (flash->chip->total_size > 16 * 1024 && spi_master_no_4ba_modes(flash)) {
@@ -2285,6 +2314,7 @@ int prepare_flash_access(struct flashctx *const flash,
void finalize_flash_access(struct flashctx *const flash)
{
deregister_chip_restore(flash);
unmap_flash(flash);
}