nmhw21: board: add user reset option via rs232
allow invoking factory reset and recovery boot via:
- uart break, followed by command ('r', 'f')
- using uart rxd as reset line
Co-authored-by: Rene Straub <rene.straub@netmodule.com>
Reviewed-by: Patrick Zysset <patrick.zysset@netmodule.com>
This commit is contained in:
René Straub
parent
a3fd0500ec
commit
7b1000b59d
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@ -104,6 +104,7 @@ DECLARE_GLOBAL_DATA_PTR;
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#define GPIO_SIM_SEL GPIO_TO_PIN(1, 12)
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#define GPIO_SIM_PRES_N GPIO_TO_PIN(2, 16)
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#define GPIO_UART2_RX GPIO_TO_PIN(0, 2) /* UART Rx Pin as GPIO */
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/*
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@ -133,6 +134,15 @@ DECLARE_GLOBAL_DATA_PTR;
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#define DDR3_CLOCK_FREQUENCY (400)
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#define DURATION_FACTORY_RESET (2000) /* Reset button time to initiate factory reset */
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#define DURATION_RECOVERY_BOOT (12000) /* Reset button time to initiate recovery boot */
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#if (DURATION_RECOVERY_BOOT < (DURATION_FACTORY_RESET+1000))
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#error Recovery boot time must be larger than factory reset + 1 second
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#endif
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#if !defined(CONFIG_SPL_BUILD)
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/* Hardware version information of mainboard, loaded by get_hw_version() */
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static int hw_ver = -1;
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@ -1109,53 +1119,431 @@ static void blink_led(int pulses)
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#endif
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}
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static void check_reset_button(void)
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{
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int counter = 0;
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/* Check how long button is pressed */
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do {
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if (!get_button_state())
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#define RESET_CHECK_PERIOD (100) /* 100 ms */
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typedef enum _action_t
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{
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NONE = 0,
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WAIT,
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FACTORY_RESET,
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RECOVERY_BOOT
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} action_t;
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static void uart2_rx_gpio_pin_mux(void)
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{
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/* Configure UART2 rxd pin as GPIO */
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static struct module_pin_mux uart2_gpio_pin_mux[] = {
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{OFFSET(spi0_sclk), (MODE(7) | PULLUDEN | PULLUP_EN | RXACTIVE)}, /* (A17) uart2_rxd = gpio0_2 */
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{-1}
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};
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configure_module_pin_mux(uart2_gpio_pin_mux);
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}
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static void uart2_rx_rx_pin_mux(void)
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{
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/* Configure UART2 rxd pin as rxd function */
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static struct module_pin_mux uart2_pin_mux[] = {
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{OFFSET(spi0_sclk), (MODE(1) | PULLUDEN | PULLUP_EN | RXACTIVE)}, /* (A17) uart2_rxd */
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{-1}
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};
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configure_module_pin_mux(uart2_pin_mux);
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}
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static bool get_rxd_state(void)
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{
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uart2_rx_gpio_pin_mux();
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(void)gpio_request(GPIO_UART2_RX, "");
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int val = gpio_get_value(GPIO_UART2_RX);
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gpio_free(GPIO_UART2_RX);
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uart2_rx_rx_pin_mux();
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return (val == 0);
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}
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static int check_button(int time, bool button)
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{
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/*
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* Hardware button logic
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*
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* input:
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* button: current button press state (true = pressed)
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* logic:
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* - if button is not pressed initially, return action NONE for all
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* invocations (state NO_ACTION)
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* - if button pressed initially, return action WAIT and measure duration
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* of press (state PRESSED).
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* - while button is pressed, measure time, indicate actions with LED,
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* - when button is released, check time and decide on factory reset
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* or recovery boot.
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*/
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typedef enum _state_t { INIT = 0, PRESSED, DONE } state_t;
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static state_t state = INIT; /* Current state */
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static action_t act = NONE; /* Action to report to user, returned at function end */
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static int duration = 0;
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if (time == 0) {
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state = INIT;
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}
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/* TODO: Remove printf, puts */
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/* printf("button: state %d button %d -> ", state, button); */
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switch (state) {
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case INIT:
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if (button) {
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/* Pressed, start to measure time until released */
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duration = 0;
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act = WAIT;
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state = PRESSED;
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}
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else {
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/* If not pressed, no further action is possible */
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act = NONE;
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state = DONE;
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}
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break;
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udelay(100*1000); /* 100ms */
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counter += 100;
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if (counter == 2000) {
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case PRESSED:
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if (button) {
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duration += RESET_CHECK_PERIOD;
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if (duration == DURATION_FACTORY_RESET) {
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/* Indicate factory reset threshold */
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blink_led(1);
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}
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else if (counter == 12000) {
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/* Indicate recovery boot threshold */
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else if (duration == DURATION_RECOVERY_BOOT) {
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/* Indicate recovery boot threshold and leave state */
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blink_led(2);
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act = RECOVERY_BOOT;
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state = DONE;
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}
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} while (counter < 12000);
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}
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else {
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/* Check how long button was pressed */
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if (duration >= DURATION_RECOVERY_BOOT) {
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act = RECOVERY_BOOT;
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state = DONE;
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}
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else if (duration >= DURATION_FACTORY_RESET) {
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act = FACTORY_RESET;
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state = DONE;
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}
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else {
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/* too short, nothing to do */
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act = NONE;
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state = DONE;
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}
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}
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break;
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if (counter < 2000) {
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/* Don't do anything for duration < 2s */
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case DONE:
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/* Final state when an action has been chosen */
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break;
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default:
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break;
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}
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else if (counter < 12000)
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/* printf("act %d\n", act); */
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return act;
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}
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static int check_break_length(int time, bool rx_line)
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{
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/* Do factory reset for duration between 2s and 12s */
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/*
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* RS232 RxD Reset input logic
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*
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* Treats RxD line as reset input. Line is considered active when
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* break condition applies (RS232 line > 3.0 V)
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*
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* input:
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* rx_line: true if rxd input is '0' (break condition)
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* logic:
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* see explanation in check_button()
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* additional logic is added to debounce input
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*/
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#define BREAK_DEB_TIME 500
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typedef enum _state_t { WAIT_BREAK = 0, HAVE_BREAK, DONE } state_t;
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static state_t state = WAIT_BREAK; /* Current state */
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static action_t act = NONE; /* Action to report to user, returned at function end */
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static int duration = 0;
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static int wait_time = 0;
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if (time == 0) {
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state = WAIT_BREAK;
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wait_time = BREAK_DEB_TIME;
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}
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/* TODO: Remove */
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/* printf("break length: state %d have_break_cond %d duration %d -> ", state, have_break_cond, duration); */
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switch (state) {
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case WAIT_BREAK:
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if (rx_line) {
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/* Break detected, start to measure time */
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duration = 0;
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wait_time = BREAK_DEB_TIME;
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act = WAIT;
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state = HAVE_BREAK;
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}
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if (wait_time > 0) {
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wait_time -= RESET_CHECK_PERIOD;
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act = WAIT;
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}
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else {
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/* If no break seen, stop here */
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act = NONE;
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state = DONE;
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}
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break;
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case HAVE_BREAK:
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if (rx_line) {
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wait_time = BREAK_DEB_TIME;
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duration += RESET_CHECK_PERIOD;
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if (duration == DURATION_FACTORY_RESET) {
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/* Indicate factory reset threshold */
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blink_led(1);
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}
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else if (duration == DURATION_RECOVERY_BOOT) {
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/* Indicate recovery boot threshold and leave state */
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blink_led(2);
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act = RECOVERY_BOOT; /* TODO: maybe remain in state until break removed */
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state = DONE;
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}
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}
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if (wait_time > 0) {
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wait_time -= RESET_CHECK_PERIOD;
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}
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else {
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/* puts("break condition released\n"); */
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/* Check how long button was pressed */
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if (duration >= DURATION_RECOVERY_BOOT) {
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act = RECOVERY_BOOT;
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state = DONE;
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}
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else if (duration >= DURATION_FACTORY_RESET) {
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act = FACTORY_RESET;
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state = DONE;
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}
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else {
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/* too short, nothing to do */
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act = NONE;
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state = DONE;
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}
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}
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break;
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case DONE:
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/* Final state when an action has been chosen */
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break;
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default:
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break;
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}
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/* printf("act %d\n", act); */
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return act;
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}
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static int check_break_command(int time, int has_input, int c)
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{
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/*
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* Break command logic
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*
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* Tries to receive the break button (system magic key) and a command to execute.
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*
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* input:
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* has_input: true if a character is available
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* c: character code (can be 0x00 for break condition, system magic key)
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* logic:
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* - waits up to 500 ms to receive a break character. if character is not seen,
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* stops here, action = NONE. if character is detected goes to next state
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* - waits up to 500 ms to receive command character. if character is not seen,
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* stops here, action = NONE. if character is detected define action accordingly
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* 'f': factory reset
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* 'r': recovery boot
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*/
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#define BREAK_WAIT_TIME 1000 /* Initial wait time for break character */
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#define CHARACTER_WAIT_TIME 1500 /* Subsequent wait time for command */
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typedef enum _state_t { WAIT_BREAK = 1, WAIT_COMMAND, DONE } state_t;
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static state_t state = WAIT_BREAK; /* Current state */
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static action_t act = NONE; /* Action to report to user, returned at function end */
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static int wait_time;
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/* TODO: remove */
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/* printf("break command: state %d, input %d %02x -> ", state, has_input, c); */
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if (time == 0) {
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state = WAIT_BREAK;
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wait_time = BREAK_WAIT_TIME;
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}
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switch (state) {
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case WAIT_BREAK: /* Wait for break indication */
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act = WAIT;
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if (has_input) {
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if (c == 0x00) {
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/* puts("break detected\n"); */
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wait_time = CHARACTER_WAIT_TIME;
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state = WAIT_COMMAND;
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}
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}
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if (wait_time > 0) {
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wait_time -= RESET_CHECK_PERIOD;
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}
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else {
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/* No break received, nothing to do from our side */
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act = NONE;
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state = DONE;
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}
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break;
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case WAIT_COMMAND:
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if (has_input) {
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wait_time = CHARACTER_WAIT_TIME;
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if (c == 0x00) {
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/* puts("break detected\n"); */
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act = WAIT;
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}
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else if (c == 'f') {
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blink_led(1);
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act = FACTORY_RESET;
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state = DONE;
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}
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else if (c == 'r') {
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blink_led(2);
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act = RECOVERY_BOOT;
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state = DONE;
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}
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else {
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/* Unknown command */
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act = NONE;
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state = DONE;
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}
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}
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if (wait_time > 0) {
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wait_time -= RESET_CHECK_PERIOD;
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}
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else {
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/* puts("character timeout\n"); */
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act = NONE;
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state = DONE;
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}
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break;
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case DONE:
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/* Final state when an action has been chosen */
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break;
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default:
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break;
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}
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/* printf("act %d\n", act); */
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return act;
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}
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static void check_reset_button(void)
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{
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/*
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* Runs state machines of all reset sources to find out if one detects
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* an action.
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*
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* SMs return
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* - WAIT if they are still trying to get a result.
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* - NONE if they know there is no action required.
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* - FACTORY_RESET, RECOVERY_BOOT if detected.
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*/
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action_t action = NONE;
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int counter = 0;
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do {
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action_t a_[3];
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bool button;
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bool rx_line;
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int has_input;
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int c = -1;
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/* Get state machine inputs */
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button = get_button_state();
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rx_line = get_rxd_state();
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has_input = tstc();
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if (has_input) {
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c = getc();
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}
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/* run processing state machines */
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a_[0] = NONE;
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a_[1] = NONE;
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a_[2] = NONE;
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a_[0] = check_button(counter, button);
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a_[1] = check_break_length(counter, rx_line);
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a_[2] = check_break_command(counter, has_input, c);
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/* if all SMs are sure there is not action, stop here */
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if ((a_[0] == NONE) && (a_[1] == NONE) && (a_[2] == NONE)) {
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action = NONE;
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break;
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}
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/* if one of the SMs has an action, stop here */
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for (int i=0; i<3; i++) {
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if ((a_[i] == FACTORY_RESET) || (a_[i] == RECOVERY_BOOT)) {
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action = a_[i];
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break;
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}
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}
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mdelay(RESET_CHECK_PERIOD);
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counter += RESET_CHECK_PERIOD;
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} while ((action != FACTORY_RESET) && (action != RECOVERY_BOOT));
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switch (action) {
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case FACTORY_RESET: {
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char new_bootargs[512];
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char *bootargs = getenv("bootargs");
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if (bootargs == 0) bootargs = "";
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puts("Do factory reset during boot...\n");
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if (bootargs == 0) bootargs = "";
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strncpy(new_bootargs, bootargs, sizeof(new_bootargs));
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strncat(new_bootargs, " factory-reset", sizeof(new_bootargs));
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setenv("bootargs", new_bootargs);
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break;
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}
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else
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{
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/* Boot into recovery for duration > 12s */
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case RECOVERY_BOOT:
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puts("Booting recovery image...\n");
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/* Set bootcmd to run recovery */
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setenv("bootcmd", "run recovery");
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break;
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default:
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set_indicator_led(0, 0);
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break;
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}
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}
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