diff options
| author | Chris Laplante <chris@laplante.io> | 2023-08-22 17:24:15 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2023-08-22 17:24:15 +0100 |
| commit | 5045ff0eb4401a80c473a93959f7abb2bce3aea0 (patch) | |
| tree | afb05c7dd0f7994fe3a570d977bc27b5c1cdd2d4 | |
| parent | b0dd9a7d6dd15a6898e9c585b521e6bec79b25aa (diff) | |
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>
| -rw-r--r-- | hw/gpio/nrf51_gpio.c | 14 | ||||
| -rw-r--r-- | include/hw/gpio/nrf51_gpio.h | 1 |
2 files changed, 14 insertions, 1 deletions
diff --git a/hw/gpio/nrf51_gpio.c b/hw/gpio/nrf51_gpio.c index b47fddf4ed..08396c69a4 100644 --- a/hw/gpio/nrf51_gpio.c +++ b/hw/gpio/nrf51_gpio.c @@ -78,6 +78,7 @@ static void update_state(NRF51GPIOState *s) int pull; size_t i; bool connected_out, dir, connected_in, out, in, input; + bool assert_detect = false; for (i = 0; i < NRF51_GPIO_PINS; i++) { pull = pull_value(s->cnf[i]); @@ -99,7 +100,15 @@ static void update_state(NRF51GPIOState *s) qemu_log_mask(LOG_GUEST_ERROR, "GPIO pin %zu short circuited\n", i); } - if (!connected_in) { + if (connected_in) { + uint32_t detect_config = extract32(s->cnf[i], 16, 2); + if ((detect_config == 2) && (in == 1)) { + assert_detect = true; + } + if ((detect_config == 3) && (in == 0)) { + assert_detect = true; + } + } else { /* * Floating input: the output stimulates IN if connected, * otherwise pull-up/pull-down resistors put a value on both @@ -116,6 +125,8 @@ static void update_state(NRF51GPIOState *s) } update_output_irq(s, i, connected_out, out); } + + qemu_set_irq(s->detect, assert_detect); } /* @@ -291,6 +302,7 @@ static void nrf51_gpio_init(Object *obj) qdev_init_gpio_in(DEVICE(s), nrf51_gpio_set, NRF51_GPIO_PINS); qdev_init_gpio_out(DEVICE(s), s->output, NRF51_GPIO_PINS); + qdev_init_gpio_out_named(DEVICE(s), &s->detect, "detect", 1); } static void nrf51_gpio_class_init(ObjectClass *klass, void *data) diff --git a/include/hw/gpio/nrf51_gpio.h b/include/hw/gpio/nrf51_gpio.h index 8f9c2f86da..fcfa2bac17 100644 --- a/include/hw/gpio/nrf51_gpio.h +++ b/include/hw/gpio/nrf51_gpio.h @@ -64,6 +64,7 @@ struct NRF51GPIOState { uint32_t old_out_connected; qemu_irq output[NRF51_GPIO_PINS]; + qemu_irq detect; }; |