hw/gpio/nrf51: implement DETECT signal
Implement nRF51 DETECT signal in the GPIO peripheral. The reference manual makes mention of a per-pin DETECT signal, but these are not exposed to the user. See https://devzone.nordicsemi.com/f/nordic-q-a/39858/gpio-per-pin-detect-signal-available for more information. Currently, I don't see a reason to model these. Signed-off-by: Chris Laplante <chris@laplante.io> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 20230728160324.1159090-2-chris@laplante.io Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@ -78,6 +78,7 @@ static void update_state(NRF51GPIOState *s)
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int pull;
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size_t i;
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bool connected_out, dir, connected_in, out, in, input;
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bool assert_detect = false;
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for (i = 0; i < NRF51_GPIO_PINS; i++) {
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pull = pull_value(s->cnf[i]);
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@ -99,7 +100,15 @@ static void update_state(NRF51GPIOState *s)
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qemu_log_mask(LOG_GUEST_ERROR,
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"GPIO pin %zu short circuited\n", i);
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}
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if (!connected_in) {
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if (connected_in) {
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uint32_t detect_config = extract32(s->cnf[i], 16, 2);
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if ((detect_config == 2) && (in == 1)) {
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assert_detect = true;
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}
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if ((detect_config == 3) && (in == 0)) {
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assert_detect = true;
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}
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} else {
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/*
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* Floating input: the output stimulates IN if connected,
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* otherwise pull-up/pull-down resistors put a value on both
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@ -116,6 +125,8 @@ static void update_state(NRF51GPIOState *s)
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}
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update_output_irq(s, i, connected_out, out);
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}
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qemu_set_irq(s->detect, assert_detect);
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}
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/*
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@ -291,6 +302,7 @@ static void nrf51_gpio_init(Object *obj)
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qdev_init_gpio_in(DEVICE(s), nrf51_gpio_set, NRF51_GPIO_PINS);
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qdev_init_gpio_out(DEVICE(s), s->output, NRF51_GPIO_PINS);
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qdev_init_gpio_out_named(DEVICE(s), &s->detect, "detect", 1);
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}
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static void nrf51_gpio_class_init(ObjectClass *klass, void *data)
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@ -64,6 +64,7 @@ struct NRF51GPIOState {
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uint32_t old_out_connected;
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qemu_irq output[NRF51_GPIO_PINS];
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qemu_irq detect;
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};
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