389 lines
9.3 KiB
C
389 lines
9.3 KiB
C
/*
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* Copyright (c) 2018, Christian Taedcke, Diego Sueiro
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <errno.h>
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#include <uart.h>
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#include <em_leuart.h>
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#include <em_gpio.h>
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#include <em_cmu.h>
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#include <soc.h>
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#define DEV_CFG(dev) \
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((const struct leuart_gecko_config * const)(dev)->config->config_info)
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#define DEV_DATA(dev) \
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((struct leuart_gecko_data * const)(dev)->driver_data)
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#define DEV_BASE(dev) \
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((LEUART_TypeDef *)(DEV_CFG(dev))->base)
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struct leuart_gecko_config {
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LEUART_TypeDef *base;
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CMU_Clock_TypeDef clock;
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u32_t baud_rate;
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struct soc_gpio_pin pin_rx;
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struct soc_gpio_pin pin_tx;
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unsigned int loc;
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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void (*irq_config_func)(struct device *dev);
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#endif
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};
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struct leuart_gecko_data {
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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uart_irq_callback_user_data_t callback;
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void *cb_data;
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#endif
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};
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static int leuart_gecko_poll_in(struct device *dev, unsigned char *c)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u32_t flags = LEUART_StatusGet(base);
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if (flags & LEUART_STATUS_RXDATAV) {
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*c = LEUART_Rx(base);
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return 0;
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}
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return -1;
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}
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static unsigned char leuart_gecko_poll_out(struct device *dev, unsigned char c)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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/* LEUART_Tx function already waits for the transmit buffer being empty
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* and and waits for the bus to be free to transmit.
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*/
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LEUART_Tx(base, c);
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return c;
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}
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static int leuart_gecko_err_check(struct device *dev)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u32_t flags = LEUART_IntGet(base);
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int err = 0;
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if (flags & LEUART_IF_RXOF) {
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err |= UART_ERROR_OVERRUN;
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}
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if (flags & LEUART_IF_PERR) {
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err |= UART_ERROR_PARITY;
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}
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if (flags & LEUART_IF_FERR) {
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err |= UART_ERROR_FRAMING;
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}
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LEUART_IntClear(base, LEUART_IF_RXOF |
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LEUART_IF_PERR |
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LEUART_IF_FERR);
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return err;
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}
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static int leuart_gecko_fifo_fill(struct device *dev, const u8_t *tx_data,
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int len)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u8_t num_tx = 0;
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while ((len - num_tx > 0) &&
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(base->STATUS & LEUART_STATUS_TXBL)) {
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base->TXDATA = (u32_t)tx_data[num_tx++];
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}
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return num_tx;
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}
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static int leuart_gecko_fifo_read(struct device *dev, u8_t *rx_data,
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const int len)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u8_t num_rx = 0;
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while ((len - num_rx > 0) &&
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(base->STATUS & LEUART_STATUS_RXDATAV)) {
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rx_data[num_rx++] = (u8_t)base->RXDATA;
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}
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return num_rx;
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}
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static void leuart_gecko_irq_tx_enable(struct device *dev)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u32_t mask = LEUART_IEN_TXBL | LEUART_IEN_TXC;
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LEUART_IntEnable(base, mask);
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}
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static void leuart_gecko_irq_tx_disable(struct device *dev)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u32_t mask = LEUART_IEN_TXBL | LEUART_IEN_TXC;
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LEUART_IntDisable(base, mask);
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}
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static int leuart_gecko_irq_tx_complete(struct device *dev)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u32_t flags = LEUART_IntGet(base);
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return (flags & LEUART_IF_TXC) != 0;
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}
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static int leuart_gecko_irq_tx_ready(struct device *dev)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u32_t flags = LEUART_IntGet(base);
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return (flags & LEUART_IF_TXBL) != 0;
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}
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static void leuart_gecko_irq_rx_enable(struct device *dev)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u32_t mask = LEUART_IEN_RXDATAV;
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LEUART_IntEnable(base, mask);
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}
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static void leuart_gecko_irq_rx_disable(struct device *dev)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u32_t mask = LEUART_IEN_RXDATAV;
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LEUART_IntDisable(base, mask);
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}
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static int leuart_gecko_irq_rx_full(struct device *dev)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u32_t flags = LEUART_IntGet(base);
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return (flags & LEUART_IF_RXDATAV) != 0;
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}
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static int leuart_gecko_irq_rx_ready(struct device *dev)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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u32_t mask = LEUART_IEN_RXDATAV;
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return (base->IEN & mask)
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&& leuart_gecko_irq_rx_full(dev);
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}
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static void leuart_gecko_irq_err_enable(struct device *dev)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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LEUART_IntEnable(base, LEUART_IF_RXOF |
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LEUART_IF_PERR |
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LEUART_IF_FERR);
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}
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static void leuart_gecko_irq_err_disable(struct device *dev)
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{
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LEUART_TypeDef *base = DEV_BASE(dev);
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LEUART_IntDisable(base, LEUART_IF_RXOF |
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LEUART_IF_PERR |
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LEUART_IF_FERR);
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}
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static int leuart_gecko_irq_is_pending(struct device *dev)
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{
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return leuart_gecko_irq_tx_ready(dev) || leuart_gecko_irq_rx_ready(dev);
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}
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static int leuart_gecko_irq_update(struct device *dev)
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{
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return 1;
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}
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static void leuart_gecko_irq_callback_set(struct device *dev,
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uart_irq_callback_user_data_t cb,
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void *cb_data)
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{
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struct leuart_gecko_data *data = dev->driver_data;
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data->callback = cb;
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data->cb_data = cb_data;
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}
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static void leuart_gecko_isr(void *arg)
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{
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struct device *dev = arg;
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struct leuart_gecko_data *data = dev->driver_data;
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if (data->callback) {
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data->callback(data->cb_data);
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}
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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static void leuart_gecko_init_pins(struct device *dev)
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{
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const struct leuart_gecko_config *config = DEV_CFG(dev);
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LEUART_TypeDef *base = DEV_BASE(dev);
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soc_gpio_configure(&config->pin_rx);
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soc_gpio_configure(&config->pin_tx);
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#ifdef _LEUART_ROUTEPEN_MASK
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base->ROUTEPEN = LEUART_ROUTEPEN_RXPEN | LEUART_ROUTEPEN_TXPEN;
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base->ROUTELOC0 = (base->ROUTELOC0
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& ~(_LEUART_ROUTELOC0_TXLOC_MASK
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| _LEUART_ROUTELOC0_RXLOC_MASK))
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| (config->loc <<
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_LEUART_ROUTELOC0_TXLOC_SHIFT)
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| (config->loc <<
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_LEUART_ROUTELOC0_RXLOC_SHIFT);
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#else
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base->ROUTE = LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN
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| (config->loc << 8);
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#endif
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}
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static int leuart_gecko_init(struct device *dev)
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{
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const struct leuart_gecko_config *config = DEV_CFG(dev);
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LEUART_TypeDef *base = DEV_BASE(dev);
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LEUART_Init_TypeDef leuartInit = LEUART_INIT_DEFAULT;
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/* The peripheral and gpio clock are already enabled from soc and gpio
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* driver
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*/
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leuartInit.baudrate = config->baud_rate;
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/* Enable LEUART clock */
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CMU_ClockEnable(config->clock, true);
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/* Enable CORE LE clock in order to access LE modules */
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CMU_ClockEnable(cmuClock_CORELE, true);
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/* Select LFXO for LEUARTs (and wait for it to stabilize) */
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CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFXO);
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/* Init LEUART */
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LEUART_Init(base, &leuartInit);
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/* Initialize LEUART pins */
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leuart_gecko_init_pins(dev);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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config->irq_config_func(dev);
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#endif
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return 0;
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}
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static const struct uart_driver_api leuart_gecko_driver_api = {
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.poll_in = leuart_gecko_poll_in,
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.poll_out = leuart_gecko_poll_out,
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.err_check = leuart_gecko_err_check,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.fifo_fill = leuart_gecko_fifo_fill,
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.fifo_read = leuart_gecko_fifo_read,
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.irq_tx_enable = leuart_gecko_irq_tx_enable,
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.irq_tx_disable = leuart_gecko_irq_tx_disable,
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.irq_tx_complete = leuart_gecko_irq_tx_complete,
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.irq_tx_ready = leuart_gecko_irq_tx_ready,
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.irq_rx_enable = leuart_gecko_irq_rx_enable,
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.irq_rx_disable = leuart_gecko_irq_rx_disable,
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.irq_rx_ready = leuart_gecko_irq_rx_ready,
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.irq_err_enable = leuart_gecko_irq_err_enable,
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.irq_err_disable = leuart_gecko_irq_err_disable,
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.irq_is_pending = leuart_gecko_irq_is_pending,
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.irq_update = leuart_gecko_irq_update,
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.irq_callback_set = leuart_gecko_irq_callback_set,
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#endif
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};
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#ifdef CONFIG_LEUART_GECKO_0
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void leuart_gecko_config_func_0(struct device *dev);
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#endif
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static const struct leuart_gecko_config leuart_gecko_0_config = {
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.base = (LEUART_TypeDef *)DT_LEUART_GECKO_0_BASE_ADDRESS,
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.clock = cmuClock_LEUART0,
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.baud_rate = DT_LEUART_GECKO_0_CURRENT_SPEED,
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.pin_rx = PIN_LEUART0_RXD,
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.pin_tx = PIN_LEUART0_TXD,
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.loc = DT_LEUART_GECKO_0_LOCATION,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.irq_config_func = leuart_gecko_config_func_0,
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#endif
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};
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static struct leuart_gecko_data leuart_gecko_0_data;
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DEVICE_AND_API_INIT(leuart_0, DT_LEUART_GECKO_0_LABEL, &leuart_gecko_init,
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&leuart_gecko_0_data, &leuart_gecko_0_config, PRE_KERNEL_1,
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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&leuart_gecko_driver_api);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void leuart_gecko_config_func_0(struct device *dev)
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{
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IRQ_CONNECT(DT_LEUART_GECKO_0_IRQ,
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DT_LEUART_GECKO_0_IRQ_PRIORITY, leuart_gecko_isr,
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DEVICE_GET(leuart_0), 0);
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irq_enable(DT_LEUART_GECKO_0_IRQ);
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}
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#endif
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#endif /* CONFIG_LEUART_GECKO_0 */
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#ifdef CONFIG_LEUART_GECKO_1
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void leuart_gecko_config_func_1(struct device *dev);
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#endif
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static const struct leuart_gecko_config leuart_gecko_1_config = {
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.base = (LEUART_TypeDef *)CONFIG_LEUART_GECKO_1_BASE_ADDRESS,
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.clock = cmuClock_LEUART0,
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.baud_rate = CONFIG_LEUART_GECKO_1_CURRENT_SPEED,
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.pin_rx = PIN_LEUART1_RXD,
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.pin_tx = PIN_LEUART1_TXD,
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.loc = CONFIG_LEUART_GECKO_1_LOCATION,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.irq_config_func = leuart_gecko_config_func_1,
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#endif
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};
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static struct leuart_gecko_data leuart_gecko_1_data;
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DEVICE_AND_API_INIT(leuart_1, CONFIG_LEUART_GECKO_1_LABEL, &leuart_gecko_init,
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&leuart_gecko_1_data, &leuart_gecko_1_config, PRE_KERNEL_1,
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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&leuart_gecko_driver_api);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void leuart_gecko_config_func_1(struct device *dev)
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{
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IRQ_CONNECT(CONFIG_LEUART_GECKO_1_IRQ,
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CONFIG_LEUART_GECKO_1_IRQ_PRIORITY, leuart_gecko_isr,
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DEVICE_GET(leuart_1), 0);
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irq_enable(CONFIG_LEUART_GECKO_1_IRQ);
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}
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#endif
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#endif /* CONFIG_LEUART_GECKO_1 */
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