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322 lines
8.5 KiB
322 lines
8.5 KiB
/* |
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* Copyright (c) 2021, Yonatan Schachter |
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* Copyright (c) 2022, Andrei-Edward Popa |
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* |
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* SPDX-License-Identifier: Apache-2.0 |
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*/ |
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#include <zephyr/drivers/uart.h> |
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#include <zephyr/drivers/reset.h> |
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#include <zephyr/drivers/pinctrl.h> |
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#include <zephyr/irq.h> |
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/* pico-sdk includes */ |
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#include <hardware/uart.h> |
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#define DT_DRV_COMPAT raspberrypi_pico_uart |
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struct uart_rpi_config { |
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uart_inst_t *const uart_dev; |
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uart_hw_t *const uart_regs; |
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const struct pinctrl_dev_config *pcfg; |
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const struct reset_dt_spec reset; |
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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 /* CONFIG_UART_INTERRUPT_DRIVEN */ |
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}; |
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struct uart_rpi_data { |
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uint32_t baudrate; |
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN |
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uart_irq_callback_user_data_t irq_cb; |
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void *irq_cb_data; |
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */ |
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}; |
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static int uart_rpi_poll_in(const struct device *dev, unsigned char *c) |
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{ |
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const struct uart_rpi_config *config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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if (uart_hw->fr & UART_UARTFR_RXFE_BITS) { |
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return -1; |
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} |
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*c = (unsigned char)uart_hw->dr; |
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return 0; |
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} |
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static void uart_rpi_poll_out(const struct device *dev, unsigned char c) |
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{ |
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const struct uart_rpi_config *config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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while (uart_hw->fr & UART_UARTFR_TXFF_BITS) { |
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/* Wait */ |
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} |
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uart_hw->dr = c; |
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} |
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static int uart_rpi_init(const struct device *dev) |
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{ |
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const struct uart_rpi_config *config = dev->config; |
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uart_inst_t * const uart_inst = config->uart_dev; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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struct uart_rpi_data * const data = dev->data; |
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int ret, baudrate; |
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ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT); |
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if (ret < 0) { |
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return ret; |
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} |
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/* |
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* uart_init() may be replaced by register based API once rpi-pico platform |
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* has a clock controller driver |
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*/ |
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baudrate = uart_init(uart_inst, data->baudrate); |
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/* Check if baudrate adjustment returned by 'uart_init' function is a positive value */ |
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if (baudrate <= 0) { |
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return -EINVAL; |
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} |
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hw_clear_bits(&uart_hw->lcr_h, UART_UARTLCR_H_FEN_BITS); |
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uart_hw->dr = 0U; |
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN |
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config->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_rpi_err_check(const struct device *dev) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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uint32_t data_reg = uart_hw->dr; |
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int errors = 0; |
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if (data_reg & UART_UARTDR_OE_BITS) { |
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errors |= UART_ERROR_OVERRUN; |
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} |
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if (data_reg & UART_UARTDR_BE_BITS) { |
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errors |= UART_BREAK; |
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} |
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if (data_reg & UART_UARTDR_PE_BITS) { |
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errors |= UART_ERROR_PARITY; |
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} |
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if (data_reg & UART_UARTDR_FE_BITS) { |
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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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#ifdef CONFIG_UART_INTERRUPT_DRIVEN |
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static int uart_rpi_fifo_fill(const struct device *dev, |
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const uint8_t *tx_data, int len) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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int tx_len = 0; |
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while (!(uart_hw->fr & UART_UARTFR_TXFF_BITS) && (len - tx_len) > 0) { |
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uart_hw->dr = tx_data[tx_len++]; |
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} |
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return tx_len; |
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} |
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static int uart_rpi_fifo_read(const struct device *dev, |
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uint8_t *rx_data, const int len) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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int rx_len = 0; |
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while (!(uart_hw->fr & UART_UARTFR_RXFE_BITS) && (len - rx_len) > 0) { |
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rx_data[rx_len++] = (uint8_t)uart_hw->dr; |
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} |
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return rx_len; |
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} |
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static void uart_rpi_irq_tx_enable(const struct device *dev) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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uart_hw->imsc |= UART_UARTIMSC_TXIM_BITS; |
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uart_hw->ifls &= ~UART_UARTIFLS_TXIFLSEL_BITS; |
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} |
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static void uart_rpi_irq_tx_disable(const struct device *dev) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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uart_hw->imsc &= ~UART_UARTIMSC_TXIM_BITS; |
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} |
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static int uart_rpi_irq_tx_ready(const struct device *dev) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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return (uart_hw->mis & UART_UARTMIS_TXMIS_BITS) == UART_UARTMIS_TXMIS_BITS; |
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} |
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static void uart_rpi_irq_rx_enable(const struct device *dev) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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uart_hw->imsc |= UART_UARTIMSC_RXIM_BITS; |
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uart_hw->ifls &= ~UART_UARTIFLS_RXIFLSEL_BITS; |
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} |
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static void uart_rpi_irq_rx_disable(const struct device *dev) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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uart_hw->imsc &= ~UART_UARTIMSC_RXIM_BITS; |
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} |
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static int uart_rpi_irq_tx_complete(const struct device *dev) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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return !!(uart_hw->fr & UART_UARTFR_TXFE_BITS); |
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} |
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static int uart_rpi_irq_rx_ready(const struct device *dev) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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return (uart_hw->mis & UART_UARTMIS_RXMIS_BITS) == UART_UARTMIS_RXMIS_BITS; |
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} |
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static void uart_rpi_irq_err_enable(const struct device *dev) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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uart_hw->imsc |= (UART_UARTIMSC_OEIM_BITS | |
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UART_UARTIMSC_BEIM_BITS | |
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UART_UARTIMSC_PEIM_BITS | |
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UART_UARTIMSC_FEIM_BITS | |
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UART_UARTIMSC_RTIM_BITS); |
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} |
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static void uart_rpi_irq_err_disable(const struct device *dev) |
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{ |
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const struct uart_rpi_config * const config = dev->config; |
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uart_hw_t * const uart_hw = config->uart_regs; |
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uart_hw->imsc &= ~(UART_UARTIMSC_OEIM_BITS | |
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UART_UARTIMSC_BEIM_BITS | |
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UART_UARTIMSC_PEIM_BITS | |
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UART_UARTIMSC_FEIM_BITS | |
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UART_UARTIMSC_RTIM_BITS); |
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} |
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static int uart_rpi_irq_is_pending(const struct device *dev) |
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{ |
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return !!(uart_rpi_irq_rx_ready(dev) || uart_rpi_irq_tx_ready(dev)); |
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} |
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static int uart_rpi_irq_update(const struct device *dev) |
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{ |
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return 1; |
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} |
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static void uart_rpi_irq_callback_set(const 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_rpi_data * const data = dev->data; |
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data->irq_cb = cb; |
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data->irq_cb_data = cb_data; |
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} |
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static void uart_rpi_isr(const struct device *dev) |
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{ |
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struct uart_rpi_data * const data = dev->data; |
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if (data->irq_cb) { |
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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_rpi_driver_api = { |
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.poll_in = uart_rpi_poll_in, |
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.poll_out = uart_rpi_poll_out, |
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.err_check = uart_rpi_err_check, |
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN |
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.fifo_fill = uart_rpi_fifo_fill, |
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.fifo_read = uart_rpi_fifo_read, |
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.irq_tx_enable = uart_rpi_irq_tx_enable, |
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.irq_tx_disable = uart_rpi_irq_tx_disable, |
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.irq_tx_ready = uart_rpi_irq_tx_ready, |
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.irq_rx_enable = uart_rpi_irq_rx_enable, |
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.irq_rx_disable = uart_rpi_irq_rx_disable, |
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.irq_tx_complete = uart_rpi_irq_tx_complete, |
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.irq_rx_ready = uart_rpi_irq_rx_ready, |
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.irq_err_enable = uart_rpi_irq_err_enable, |
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.irq_err_disable = uart_rpi_irq_err_disable, |
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.irq_is_pending = uart_rpi_irq_is_pending, |
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.irq_update = uart_rpi_irq_update, |
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.irq_callback_set = uart_rpi_irq_callback_set, |
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */ |
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}; |
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN |
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#define RPI_UART_IRQ_CONFIG_INIT(idx) \ |
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.irq_config_func = uart##idx##_rpi_irq_config_func |
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#else |
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#define RPI_UART_IRQ_CONFIG_INIT(idx) |
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN*/ |
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#define RPI_UART_INIT(idx) \ |
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PINCTRL_DT_INST_DEFINE(idx); \ |
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\ |
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static void uart##idx##_rpi_irq_config_func(const struct device *port) \ |
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{ \ |
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IRQ_CONNECT(DT_INST_IRQN(idx), \ |
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DT_INST_IRQ(idx, priority), \ |
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uart_rpi_isr, \ |
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DEVICE_DT_INST_GET(idx), 0); \ |
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irq_enable(DT_INST_IRQN(idx)); \ |
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} \ |
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\ |
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static const struct uart_rpi_config uart##idx##_rpi_config = { \ |
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.uart_dev = uart##idx, \ |
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.uart_regs = (uart_hw_t *)uart##idx, \ |
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.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(idx), \ |
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.reset = RESET_DT_SPEC_INST_GET(idx), \ |
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RPI_UART_IRQ_CONFIG_INIT(idx), \ |
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}; \ |
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\ |
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static struct uart_rpi_data uart##idx##_rpi_data = { \ |
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.baudrate = DT_INST_PROP(idx, current_speed), \ |
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}; \ |
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\ |
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DEVICE_DT_INST_DEFINE(idx, &uart_rpi_init, \ |
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NULL, &uart##idx##_rpi_data, \ |
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&uart##idx##_rpi_config, PRE_KERNEL_1, \ |
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CONFIG_SERIAL_INIT_PRIORITY, \ |
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&uart_rpi_driver_api); \ |
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DT_INST_FOREACH_STATUS_OKAY(RPI_UART_INIT)
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