571 lines
13 KiB
C
571 lines
13 KiB
C
/*
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* Copyright (c) 2017 Piotr Mienkowski
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* Copyright (c) 2018 Justin Watson
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* SPDX-License-Identifier: Apache-2.0
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*/
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/** @file
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* @brief UART driver for Atmel SAM MCU family.
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*
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* Note:
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* - Error handling is not implemented.
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* - The driver works only in polling mode, interrupt mode is not implemented.
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*/
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#include <errno.h>
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#include <misc/__assert.h>
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#include <device.h>
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#include <init.h>
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#include <soc.h>
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#include <uart.h>
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/*
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* Verify Kconfig configuration
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*/
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#if CONFIG_UART_SAM_PORT_0 == 1
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#if CONFIG_UART_SAM_PORT_0_BAUD_RATE == 0
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#error "CONFIG_UART_SAM_PORT_0_BAUD_RATE has to be bigger than 0"
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#endif
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#endif
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#if CONFIG_UART_SAM_PORT_1 == 1
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#if CONFIG_UART_SAM_PORT_1_BAUD_RATE == 0
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#error "CONFIG_UART_SAM_PORT_1_BAUD_RATE has to be bigger than 0"
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#endif
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#endif
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#if CONFIG_UART_SAM_PORT_2 == 1
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#if CONFIG_UART_SAM_PORT_2_BAUD_RATE == 0
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#error "CONFIG_UART_SAM_PORT_2_BAUD_RATE has to be bigger than 0"
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#endif
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#endif
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#if CONFIG_UART_SAM_PORT_3 == 1
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#if CONFIG_UART_SAM_PORT_3_BAUD_RATE == 0
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#error "CONFIG_UART_SAM_PORT_3_BAUD_RATE has to be bigger than 0"
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#endif
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#endif
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#if CONFIG_UART_SAM_PORT_4 == 1
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#if CONFIG_UART_SAM_PORT_4_BAUD_RATE == 0
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#error "CONFIG_UART_SAM_PORT_4_BAUD_RATE has to be bigger than 0"
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#endif
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#endif
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/* Device constant configuration parameters */
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struct uart_sam_dev_cfg {
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Uart *regs;
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u32_t periph_id;
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struct soc_gpio_pin pin_rx;
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struct soc_gpio_pin pin_tx;
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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uart_irq_config_func_t irq_config_func;
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#endif
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};
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/* Device run time data */
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struct uart_sam_dev_data {
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u32_t baud_rate;
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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uart_irq_callback_user_data_t irq_cb; /* Interrupt Callback */
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void *irq_cb_data; /* Interrupt Callback Arg */
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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};
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#define DEV_CFG(dev) \
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((const struct uart_sam_dev_cfg *const)(dev)->config->config_info)
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#define DEV_DATA(dev) \
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((struct uart_sam_dev_data *const)(dev)->driver_data)
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static int baudrate_set(Uart *const uart, u32_t baudrate,
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u32_t mck_freq_hz);
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static int uart_sam_init(struct device *dev)
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{
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int retval;
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const struct uart_sam_dev_cfg *const cfg = DEV_CFG(dev);
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struct uart_sam_dev_data *const dev_data = DEV_DATA(dev);
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Uart *const uart = cfg->regs;
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/* Enable UART clock in PMC */
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soc_pmc_peripheral_enable(cfg->periph_id);
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/* Connect pins to the peripheral */
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soc_gpio_configure(&cfg->pin_rx);
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soc_gpio_configure(&cfg->pin_tx);
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/* Reset and disable UART */
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uart->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX
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| UART_CR_RXDIS | UART_CR_TXDIS | UART_CR_RSTSTA;
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/* Disable Interrupts */
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uart->UART_IDR = 0xFFFFFFFF;
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/* 8 bits of data, no parity, 1 stop bit in normal mode, baud rate
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* driven by the peripheral clock, UART does not filter the receive line
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*/
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uart->UART_MR = UART_MR_PAR_NO
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| UART_MR_CHMODE_NORMAL;
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/* Set baud rate */
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retval = baudrate_set(uart, dev_data->baud_rate,
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SOC_ATMEL_SAM_MCK_FREQ_HZ);
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if (retval != 0) {
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return retval;
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};
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/* Enable receiver and transmitter */
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uart->UART_CR = UART_CR_RXEN | UART_CR_TXEN;
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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cfg->irq_config_func(dev);
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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return 0;
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}
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static int uart_sam_poll_in(struct device *dev, unsigned char *c)
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{
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Uart *const uart = DEV_CFG(dev)->regs;
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if (!(uart->UART_SR & UART_SR_RXRDY)) {
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return -EBUSY;
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}
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/* got a character */
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*c = (unsigned char)uart->UART_RHR;
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return 0;
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}
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static unsigned char uart_sam_poll_out(struct device *dev, unsigned char c)
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{
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Uart *const uart = DEV_CFG(dev)->regs;
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/* Wait for transmitter to be ready */
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while (!(uart->UART_SR & UART_SR_TXRDY))
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;
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/* send a character */
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uart->UART_THR = (u32_t)c;
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return c;
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}
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static int uart_sam_err_check(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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int errors = 0;
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if (uart->UART_SR & UART_SR_OVRE) {
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errors |= UART_ERROR_OVERRUN;
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}
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if (uart->UART_SR & UART_SR_PARE) {
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errors |= UART_ERROR_PARITY;
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}
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if (uart->UART_SR & UART_SR_FRAME) {
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errors |= UART_ERROR_FRAMING;
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}
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return errors;
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}
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static int baudrate_set(Uart *const uart, u32_t baudrate,
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u32_t mck_freq_hz)
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{
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u32_t divisor;
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__ASSERT(baudrate,
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"baud rate has to be bigger than 0");
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__ASSERT(mck_freq_hz/16 >= baudrate,
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"MCK frequency is too small to set required baud rate");
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divisor = mck_freq_hz / 16 / baudrate;
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if (divisor > 0xFFFF) {
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return -EINVAL;
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};
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uart->UART_BRGR = UART_BRGR_CD(divisor);
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return 0;
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}
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static int uart_sam_fifo_fill(struct device *dev, const uint8_t *tx_data,
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int size)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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/* Wait for transmitter to be ready. */
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while ((uart->UART_SR & UART_SR_TXRDY) == 0)
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;
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uart->UART_THR = *tx_data;
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return 1;
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}
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static int uart_sam_fifo_read(struct device *dev, uint8_t *rx_data,
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const int size)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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int bytes_read;
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bytes_read = 0;
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while (bytes_read < size) {
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if (uart->UART_SR & UART_SR_RXRDY) {
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rx_data[bytes_read] = uart->UART_RHR;
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bytes_read++;
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} else {
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break;
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}
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}
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return bytes_read;
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}
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static void uart_sam_irq_tx_enable(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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uart->UART_IER = UART_IER_TXRDY;
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}
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static void uart_sam_irq_tx_disable(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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uart->UART_IDR = UART_IDR_TXRDY;
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}
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static int uart_sam_irq_tx_ready(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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return (uart->UART_SR & UART_SR_TXRDY);
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}
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static void uart_sam_irq_rx_enable(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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uart->UART_IER = UART_IER_RXRDY;
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}
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static void uart_sam_irq_rx_disable(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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uart->UART_IDR = UART_IDR_RXRDY;
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}
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static int uart_sam_irq_tx_complete(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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return !(uart->UART_SR & UART_SR_TXRDY);
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}
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static int uart_sam_irq_rx_ready(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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return (uart->UART_SR & UART_SR_RXRDY);
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}
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static void uart_sam_irq_err_enable(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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uart->UART_IER = UART_IER_OVRE | UART_IER_FRAME | UART_IER_PARE;
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}
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static void uart_sam_irq_err_disable(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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uart->UART_IDR = UART_IDR_OVRE | UART_IDR_FRAME | UART_IDR_PARE;
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}
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static int uart_sam_irq_is_pending(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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return ((uart->UART_SR & UART_SR_TXRDY)
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| (uart->UART_SR & UART_SR_RXRDY));
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}
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static int uart_sam_irq_update(struct device *dev)
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{
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volatile Uart * const uart = DEV_CFG(dev)->regs;
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return (uart->UART_SR & UART_SR_TXEMPTY);
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}
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static void uart_sam_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 uart_sam_dev_data *const dev_data = DEV_DATA(dev);
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dev_data->irq_cb = cb;
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dev_data->irq_cb_data = cb_data;
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}
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static void uart_sam_isr(void *arg)
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{
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struct device *dev = arg;
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struct uart_sam_dev_data *const dev_data = DEV_DATA(dev);
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if (dev_data->irq_cb) {
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dev_data->irq_cb(dev_data->irq_cb_data);
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}
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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static const struct uart_driver_api uart_sam_driver_api = {
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.poll_in = uart_sam_poll_in,
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.poll_out = uart_sam_poll_out,
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.err_check = uart_sam_err_check,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.fifo_fill = uart_sam_fifo_fill,
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.fifo_read = uart_sam_fifo_read,
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.irq_tx_enable = uart_sam_irq_tx_enable,
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.irq_tx_disable = uart_sam_irq_tx_disable,
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.irq_tx_ready = uart_sam_irq_tx_ready,
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.irq_rx_enable = uart_sam_irq_rx_enable,
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.irq_rx_disable = uart_sam_irq_rx_disable,
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.irq_tx_complete = uart_sam_irq_tx_complete,
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.irq_rx_ready = uart_sam_irq_rx_ready,
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.irq_err_enable = uart_sam_irq_err_enable,
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.irq_err_disable = uart_sam_irq_err_disable,
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.irq_is_pending = uart_sam_irq_is_pending,
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.irq_update = uart_sam_irq_update,
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.irq_callback_set = uart_sam_irq_callback_set,
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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};
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/* UART0 */
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#ifdef CONFIG_UART_SAM_PORT_0
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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/* Forward declare function */
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static void uart0_sam_irq_config_func(struct device *port);
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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static const struct uart_sam_dev_cfg uart0_sam_config = {
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.regs = UART0,
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.periph_id = ID_UART0,
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.pin_rx = PIN_UART0_RXD,
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.pin_tx = PIN_UART0_TXD,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.irq_config_func = uart0_sam_irq_config_func,
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#endif
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};
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static struct uart_sam_dev_data uart0_sam_data = {
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.baud_rate = CONFIG_UART_SAM_PORT_0_BAUD_RATE,
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};
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DEVICE_AND_API_INIT(uart0_sam, CONFIG_UART_SAM_PORT_0_NAME, &uart_sam_init,
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&uart0_sam_data, &uart0_sam_config, PRE_KERNEL_1,
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &uart_sam_driver_api);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void uart0_sam_irq_config_func(struct device *port)
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{
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IRQ_CONNECT(CONFIG_UART_SAM_PORT_0_IRQ,
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CONFIG_UART_SAM_PORT_0_IRQ_PRIO,
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uart_sam_isr,
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DEVICE_GET(uart0_sam), 0);
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irq_enable(CONFIG_UART_SAM_PORT_0_IRQ);
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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#endif /* CONFIG_UART_SAM_PORT_0 */
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/* UART1 */
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#ifdef CONFIG_UART_SAM_PORT_1
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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/* Forward declare function */
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static void uart1_sam_irq_config_func(struct device *port);
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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static const struct uart_sam_dev_cfg uart1_sam_config = {
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.regs = UART1,
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.periph_id = ID_UART1,
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.pin_rx = PIN_UART1_RXD,
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.pin_tx = PIN_UART1_TXD,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.irq_config_func = uart1_sam_irq_config_func,
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#endif
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};
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static struct uart_sam_dev_data uart1_sam_data = {
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.baud_rate = CONFIG_UART_SAM_PORT_1_BAUD_RATE,
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};
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DEVICE_AND_API_INIT(uart1_sam, CONFIG_UART_SAM_PORT_1_NAME, &uart_sam_init,
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&uart1_sam_data, &uart1_sam_config, PRE_KERNEL_1,
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &uart_sam_driver_api);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void uart1_sam_irq_config_func(struct device *port)
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{
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IRQ_CONNECT(CONFIG_UART_SAM_PORT_1_IRQ,
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CONFIG_UART_SAM_PORT_1_IRQ_PRIO,
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uart_sam_isr,
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DEVICE_GET(uart1_sam), 0);
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irq_enable(CONFIG_UART_SAM_PORT_1_IRQ);
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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#endif /* CONFIG_UART_SAM_PORT_1 */
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/* UART2 */
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#ifdef CONFIG_UART_SAM_PORT_2
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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/* Forward declare function */
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static void uart2_sam_irq_config_func(struct device *port);
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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static const struct uart_sam_dev_cfg uart2_sam_config = {
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.regs = UART2,
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.periph_id = ID_UART2,
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.pin_rx = PIN_UART2_RXD,
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.pin_tx = PIN_UART2_TXD,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.irq_config_func = uart2_sam_irq_config_func,
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#endif
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};
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static struct uart_sam_dev_data uart2_sam_data = {
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.baud_rate = CONFIG_UART_SAM_PORT_2_BAUD_RATE,
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};
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DEVICE_AND_API_INIT(uart2_sam, CONFIG_UART_SAM_PORT_2_NAME, &uart_sam_init,
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&uart2_sam_data, &uart2_sam_config, PRE_KERNEL_1,
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &uart_sam_driver_api);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void uart2_sam_irq_config_func(struct device *port)
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{
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IRQ_CONNECT(CONFIG_UART_SAM_PORT_2_IRQ,
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CONFIG_UART_SAM_PORT_2_IRQ_PRIO,
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uart_sam_isr,
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DEVICE_GET(uart2_sam), 0);
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irq_enable(CONFIG_UART_SAM_PORT_2_IRQ);
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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#endif
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/* UART3 */
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#ifdef CONFIG_UART_SAM_PORT_3
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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/* Forward declare function */
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static void uart3_sam_irq_config_func(struct device *port);
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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static const struct uart_sam_dev_cfg uart3_sam_config = {
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.regs = UART3,
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.periph_id = ID_UART3,
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.pin_rx = PIN_UART3_RXD,
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.pin_tx = PIN_UART3_TXD,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.irq_config_func = uart3_sam_irq_config_func,
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#endif
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};
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static struct uart_sam_dev_data uart3_sam_data = {
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.baud_rate = CONFIG_UART_SAM_PORT_3_BAUD_RATE,
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};
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DEVICE_AND_API_INIT(uart3_sam, CONFIG_UART_SAM_PORT_3_NAME, &uart_sam_init,
|
|
&uart3_sam_data, &uart3_sam_config, PRE_KERNEL_1,
|
|
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &uart_sam_driver_api);
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
static void uart3_sam_irq_config_func(struct device *port)
|
|
{
|
|
IRQ_CONNECT(CONFIG_UART_SAM_PORT_3_IRQ,
|
|
CONFIG_UART_SAM_PORT_3_IRQ_PRIO,
|
|
uart_sam_isr,
|
|
DEVICE_GET(uart3_sam), 0);
|
|
irq_enable(CONFIG_UART_SAM_PORT_3_IRQ);
|
|
}
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
#endif
|
|
|
|
/* UART4 */
|
|
|
|
#ifdef CONFIG_UART_SAM_PORT_4
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
/* Forward declare function */
|
|
static void uart4_sam_irq_config_func(struct device *port);
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
static const struct uart_sam_dev_cfg uart4_sam_config = {
|
|
.regs = UART4,
|
|
.periph_id = ID_UART4,
|
|
.pin_rx = PIN_UART4_RXD,
|
|
.pin_tx = PIN_UART4_TXD,
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.irq_config_func = uart4_sam_irq_config_func,
|
|
#endif
|
|
};
|
|
|
|
static struct uart_sam_dev_data uart4_sam_data = {
|
|
.baud_rate = CONFIG_UART_SAM_PORT_4_BAUD_RATE,
|
|
};
|
|
|
|
DEVICE_AND_API_INIT(uart4_sam, CONFIG_UART_SAM_PORT_4_NAME, &uart_sam_init,
|
|
&uart4_sam_data, &uart4_sam_config, PRE_KERNEL_1,
|
|
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &uart_sam_driver_api);
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
static void uart4_sam_irq_config_func(struct device *port)
|
|
{
|
|
IRQ_CONNECT(CONFIG_UART_SAM_PORT_4_IRQ,
|
|
CONFIG_UART_SAM_PORT_4_IRQ_PRIO,
|
|
uart_sam_isr,
|
|
DEVICE_GET(uart4_sam), 0);
|
|
irq_enable(CONFIG_UART_SAM_PORT_4_IRQ);
|
|
}
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
#endif
|