diff options
Diffstat (limited to 'board/cr50/board.c')
| -rw-r--r-- | board/cr50/board.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/board/cr50/board.c b/board/cr50/board.c index 3e30b1986e..3d43647ce3 100644 --- a/board/cr50/board.c +++ b/board/cr50/board.c @@ -1705,3 +1705,31 @@ void board_start_ite_sync(void) /* Let the usb reply to make it to the host. */ hook_call_deferred(&deferred_ite_sync_reset_data, 10 * MSEC); } + +void board_unwedge_i2cs(void) +{ + /* + * Create connection between i2cs_scl and the 'unwedge_scl' GPIO, and + * generate the i2c stop sequence which will reset the i2cs FSM. + * + * First, disconnect the external pin from the i2cs_scl input. + */ + GWRITE(PINMUX, DIOA9_SEL, 0); + + /* Connect the 'unwedge' GPIO to the i2cs_scl input. */ + GWRITE(PINMUX, GPIO1_GPIO5_SEL, GC_PINMUX_I2CS0_SCL_SEL); + + /* Generate a 'stop' condition. */ + gpio_set_level(GPIO_UNWEDGE_I2CS_SCL, 1); + usleep(2); + GWRITE_FIELD(I2CS, CTRL_SDA_VAL, READ0_S, 1); + usleep(2); + GWRITE_FIELD(I2CS, CTRL_SDA_VAL, READ0_S, 0); + usleep(2); + + /* Disconnect the 'unwedge' mode SCL. */ + GWRITE(PINMUX, GPIO1_GPIO5_SEL, 0); + + /* Restore external pin connection to the i2cs_scl. */ + GWRITE(PINMUX, DIOA9_SEL, GC_PINMUX_I2CS0_SCL_SEL); +} |