| /* |
| * Copyright (c) 2017, Christian Taedcke |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <errno.h> |
| #include <uart.h> |
| #include <em_usart.h> |
| #include <em_gpio.h> |
| #include <em_cmu.h> |
| #include <soc.h> |
| |
| struct uart_gecko_config { |
| USART_TypeDef *base; |
| CMU_Clock_TypeDef clock; |
| u32_t baud_rate; |
| struct soc_gpio_pin pin_rx; |
| struct soc_gpio_pin pin_tx; |
| unsigned int loc; |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| void (*irq_config_func)(struct device *dev); |
| #endif |
| }; |
| |
| struct uart_gecko_data { |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| uart_irq_callback_t callback; |
| #endif |
| }; |
| |
| static int uart_gecko_poll_in(struct device *dev, unsigned char *c) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u32_t flags = USART_StatusGet(config->base); |
| |
| if (flags & USART_STATUS_RXDATAV) { |
| *c = USART_Rx(config->base); |
| return 0; |
| } |
| |
| return -1; |
| } |
| |
| static unsigned char uart_gecko_poll_out(struct device *dev, unsigned char c) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| |
| USART_Tx(config->base, c); |
| |
| return c; |
| } |
| |
| static int uart_gecko_err_check(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u32_t flags = USART_IntGet(config->base); |
| int err = 0; |
| |
| if (flags & USART_IF_RXOF) { |
| err |= UART_ERROR_OVERRUN; |
| } |
| |
| if (flags & USART_IF_PERR) { |
| err |= UART_ERROR_PARITY; |
| } |
| |
| if (flags & USART_IF_FERR) { |
| err |= UART_ERROR_FRAMING; |
| } |
| |
| USART_IntClear(config->base, USART_IF_RXOF | |
| USART_IF_PERR | |
| USART_IF_FERR); |
| |
| return err; |
| } |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| static int uart_gecko_fifo_fill(struct device *dev, const u8_t *tx_data, |
| int len) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u8_t num_tx = 0; |
| |
| while ((len - num_tx > 0) && |
| (config->base->STATUS & USART_STATUS_TXBL)) { |
| |
| config->base->TXDATA = (u32_t)tx_data[num_tx++]; |
| } |
| |
| return num_tx; |
| } |
| |
| static int uart_gecko_fifo_read(struct device *dev, u8_t *rx_data, |
| const int len) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u8_t num_rx = 0; |
| |
| while ((len - num_rx > 0) && |
| (config->base->STATUS & USART_STATUS_RXDATAV)) { |
| |
| rx_data[num_rx++] = (u8_t)config->base->RXDATA; |
| } |
| |
| return num_rx; |
| } |
| |
| static void uart_gecko_irq_tx_enable(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u32_t mask = USART_IEN_TXBL | USART_IEN_TXC; |
| |
| USART_IntEnable(config->base, mask); |
| } |
| |
| static void uart_gecko_irq_tx_disable(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u32_t mask = USART_IEN_TXBL | USART_IEN_TXC; |
| |
| USART_IntDisable(config->base, mask); |
| } |
| |
| static int uart_gecko_irq_tx_complete(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u32_t flags = USART_IntGet(config->base); |
| |
| USART_IntClear(config->base, USART_IF_TXC); |
| |
| return (flags & USART_IF_TXC) != 0; |
| } |
| |
| static int uart_gecko_irq_tx_ready(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u32_t flags = USART_IntGet(config->base); |
| |
| return (flags & USART_IF_TXBL) != 0; |
| } |
| |
| static void uart_gecko_irq_rx_enable(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u32_t mask = USART_IEN_RXDATAV; |
| |
| USART_IntEnable(config->base, mask); |
| } |
| |
| static void uart_gecko_irq_rx_disable(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u32_t mask = USART_IEN_RXDATAV; |
| |
| USART_IntDisable(config->base, mask); |
| } |
| |
| static int uart_gecko_irq_rx_full(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u32_t flags = USART_IntGet(config->base); |
| |
| return (flags & USART_IF_RXDATAV) != 0; |
| } |
| |
| static int uart_gecko_irq_rx_ready(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| u32_t mask = USART_IEN_RXDATAV; |
| |
| return (config->base->IEN & mask) |
| && uart_gecko_irq_rx_full(dev); |
| } |
| |
| static void uart_gecko_irq_err_enable(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| |
| USART_IntEnable(config->base, USART_IF_RXOF | |
| USART_IF_PERR | |
| USART_IF_FERR); |
| } |
| |
| static void uart_gecko_irq_err_disable(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| |
| USART_IntDisable(config->base, USART_IF_RXOF | |
| USART_IF_PERR | |
| USART_IF_FERR); |
| } |
| |
| static int uart_gecko_irq_is_pending(struct device *dev) |
| { |
| return uart_gecko_irq_tx_ready(dev) || uart_gecko_irq_rx_ready(dev); |
| } |
| |
| static int uart_gecko_irq_update(struct device *dev) |
| { |
| return 1; |
| } |
| |
| static void uart_gecko_irq_callback_set(struct device *dev, |
| uart_irq_callback_t cb) |
| { |
| struct uart_gecko_data *data = dev->driver_data; |
| |
| data->callback = cb; |
| } |
| |
| static void uart_gecko_isr(void *arg) |
| { |
| struct device *dev = arg; |
| struct uart_gecko_data *data = dev->driver_data; |
| |
| if (data->callback) { |
| data->callback(dev); |
| } |
| } |
| #endif /* CONFIG_UART_INTERRUPT_DRIVEN */ |
| |
| static void uart_gecko_init_pins(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| |
| soc_gpio_configure(&config->pin_rx); |
| soc_gpio_configure(&config->pin_tx); |
| |
| config->base->ROUTE = USART_ROUTE_RXPEN | USART_ROUTE_TXPEN |
| | (config->loc << 8); |
| } |
| |
| static int uart_gecko_init(struct device *dev) |
| { |
| const struct uart_gecko_config *config = dev->config->config_info; |
| USART_InitAsync_TypeDef usartInit = USART_INITASYNC_DEFAULT; |
| |
| /* The peripheral and gpio clock are already enabled from soc and gpio |
| * driver |
| */ |
| |
| usartInit.baudrate = config->baud_rate; |
| |
| /* Enable USART clock */ |
| CMU_ClockEnable(config->clock, true); |
| |
| /* Init USART */ |
| USART_InitAsync(config->base, &usartInit); |
| |
| /* Initialize USART pins */ |
| uart_gecko_init_pins(dev); |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| config->irq_config_func(dev); |
| #endif |
| |
| return 0; |
| } |
| |
| static const struct uart_driver_api uart_gecko_driver_api = { |
| .poll_in = uart_gecko_poll_in, |
| .poll_out = uart_gecko_poll_out, |
| .err_check = uart_gecko_err_check, |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| .fifo_fill = uart_gecko_fifo_fill, |
| .fifo_read = uart_gecko_fifo_read, |
| .irq_tx_enable = uart_gecko_irq_tx_enable, |
| .irq_tx_disable = uart_gecko_irq_tx_disable, |
| .irq_tx_complete = uart_gecko_irq_tx_complete, |
| .irq_tx_ready = uart_gecko_irq_tx_ready, |
| .irq_rx_enable = uart_gecko_irq_rx_enable, |
| .irq_rx_disable = uart_gecko_irq_rx_disable, |
| .irq_rx_ready = uart_gecko_irq_rx_ready, |
| .irq_err_enable = uart_gecko_irq_err_enable, |
| .irq_err_disable = uart_gecko_irq_err_disable, |
| .irq_is_pending = uart_gecko_irq_is_pending, |
| .irq_update = uart_gecko_irq_update, |
| .irq_callback_set = uart_gecko_irq_callback_set, |
| #endif |
| }; |
| |
| #ifdef CONFIG_UART_GECKO_0 |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| static void uart_gecko_config_func_0(struct device *dev); |
| #endif |
| |
| static const struct uart_gecko_config uart_gecko_0_config = { |
| .base = UART0, |
| .clock = cmuClock_UART0, |
| .baud_rate = CONFIG_UART_GECKO_0_BAUD_RATE, |
| .pin_rx = PIN_UART0_RXD, |
| .pin_tx = PIN_UART0_TXD, |
| .loc = CONFIG_UART_GECKO_0_GPIO_LOC, |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| .irq_config_func = uart_gecko_config_func_0, |
| #endif |
| }; |
| |
| static struct uart_gecko_data uart_gecko_0_data; |
| |
| DEVICE_AND_API_INIT(uart_0, CONFIG_UART_GECKO_0_NAME, |
| &uart_gecko_init, |
| &uart_gecko_0_data, &uart_gecko_0_config, |
| PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, |
| &uart_gecko_driver_api); |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| static void uart_gecko_config_func_0(struct device *dev) |
| { |
| IRQ_CONNECT(UART0_RX_IRQn, CONFIG_UART_GECKO_0_IRQ_PRI, |
| uart_gecko_isr, DEVICE_GET(uart_0), 0); |
| IRQ_CONNECT(UART0_TX_IRQn, CONFIG_UART_GECKO_0_IRQ_PRI, |
| uart_gecko_isr, DEVICE_GET(uart_0), 0); |
| |
| irq_enable(UART0_TX_IRQn); |
| irq_enable(UART0_RX_IRQn); |
| } |
| #endif |
| |
| #endif /* CONFIG_UART_GECKO_0 */ |
| |
| #ifdef CONFIG_UART_GECKO_1 |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| static void uart_gecko_config_func_1(struct device *dev); |
| #endif |
| |
| static const struct uart_gecko_config uart_gecko_1_config = { |
| .base = UART1, |
| .clock = cmuClock_UART1, |
| .baud_rate = CONFIG_UART_GECKO_1_BAUD_RATE, |
| .pin_rx = PIN_UART1_RXD, |
| .pin_tx = PIN_UART1_TXD, |
| .loc = CONFIG_UART_GECKO_1_GPIO_LOC, |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| .irq_config_func = uart_gecko_config_func_1, |
| #endif |
| }; |
| |
| static struct uart_gecko_data uart_gecko_1_data; |
| |
| DEVICE_AND_API_INIT(uart_1, CONFIG_UART_GECKO_1_NAME, |
| &uart_gecko_init, |
| &uart_gecko_1_data, &uart_gecko_1_config, |
| PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, |
| &uart_gecko_driver_api); |
| |
| #ifdef CONFIG_UART_INTERRUPT_DRIVEN |
| static void uart_gecko_config_func_1(struct device *dev) |
| { |
| IRQ_CONNECT(UART1_RX_IRQn, CONFIG_UART_GECKO_1_IRQ_PRI, |
| uart_gecko_isr, DEVICE_GET(uart_1), 0); |
| IRQ_CONNECT(UART1_TX_IRQn, CONFIG_UART_GECKO_1_IRQ_PRI, |
| uart_gecko_isr, DEVICE_GET(uart_1), 0); |
| |
| irq_enable(UART1_RX_IRQn); |
| irq_enable(UART1_TX_IRQn); |
| } |
| #endif |
| |
| #endif /* CONFIG_UART_GECKO_1 */ |