314 lines
8.5 KiB
C
314 lines
8.5 KiB
C
/*
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* Copyright (c) 2016-2017, Texas Instruments Incorporated
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/* See www.ti.com/lit/pdf/swru367, section 6, for CC3200 UART info. */
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#include <kernel.h>
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#include <arch/cpu.h>
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#include <uart.h>
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/* Driverlib includes */
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#include <inc/hw_types.h>
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#include <driverlib/rom.h>
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#include <driverlib/rom_map.h>
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#include <driverlib/prcm.h>
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#include <driverlib/uart.h>
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struct uart_cc32xx_dev_data_t {
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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uart_irq_callback_t cb; /**< Callback function pointer */
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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_device_config * const)(dev)->config->config_info)
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#define DEV_DATA(dev) \
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((struct uart_cc32xx_dev_data_t * const)(dev)->driver_data)
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/* Forward decls: */
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static struct device DEVICE_NAME_GET(uart_cc32xx_0);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void uart_cc32xx_isr(void *arg);
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#endif
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static const struct uart_device_config uart_cc32xx_dev_cfg_0 = {
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.base = (void *)TI_CC32XX_UART_4000C000_BASE_ADDRESS,
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.sys_clk_freq = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC,
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};
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static struct uart_cc32xx_dev_data_t uart_cc32xx_dev_data_0 = {
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.cb = NULL,
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#endif
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};
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/*
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* CC32XX UART has a configurable FIFO length, from 1 to 8 characters.
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* However, the Zephyr console driver, and the Zephyr uart sample test, assume
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* a RX FIFO depth of one: meaning, one interrupt == one character received.
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* Keeping with this assumption, this driver leaves the FIFOs disabled,
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* and at depth 1.
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*/
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static int uart_cc32xx_init(struct device *dev)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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MAP_PRCMPeripheralReset(PRCM_UARTA0);
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/* This also calls MAP_UARTEnable() to enable the FIFOs: */
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MAP_UARTConfigSetExpClk((unsigned long)config->base,
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MAP_PRCMPeripheralClockGet(PRCM_UARTA0),
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TI_CC32XX_UART_4000C000_CURRENT_SPEED,
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(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE
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| UART_CONFIG_PAR_NONE));
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MAP_UARTFlowControlSet((unsigned long)config->base,
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UART_FLOWCONTROL_NONE);
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/* Re-disable the FIFOs: */
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MAP_UARTFIFODisable((unsigned long)config->base);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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/* Clear any pending UART interrupts: we only care about RX, TX: */
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MAP_UARTIntClear((unsigned long)config->base,
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(UART_INT_RX | UART_INT_TX));
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IRQ_CONNECT(TI_CC32XX_UART_4000C000_IRQ_0,
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TI_CC32XX_UART_4000C000_IRQ_0_PRIORITY,
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uart_cc32xx_isr, DEVICE_GET(uart_cc32xx_0),
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0);
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irq_enable(TI_CC32XX_UART_4000C000_IRQ_0);
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#endif
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return 0;
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}
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static int uart_cc32xx_poll_in(struct device *dev, unsigned char *c)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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if (MAP_UARTCharsAvail((unsigned long)config->base)) {
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*c = MAP_UARTCharGetNonBlocking((unsigned long)config->base);
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} else {
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return (-1);
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}
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return 0;
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}
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static unsigned char uart_cc32xx_poll_out(struct device *dev, unsigned char c)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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MAP_UARTCharPut((unsigned long)config->base, c);
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return c;
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}
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static int uart_cc32xx_err_check(struct device *dev)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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unsigned long cc32xx_errs = 0L;
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unsigned int z_err = 0;
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cc32xx_errs = MAP_UARTRxErrorGet((unsigned long)config->base);
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/* Map cc3200 SDK uart.h defines to zephyr uart.h defines */
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z_err = ((cc32xx_errs & UART_RXERROR_OVERRUN) ?
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UART_ERROR_OVERRUN : 0) |
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((cc32xx_errs & UART_RXERROR_BREAK) ? UART_ERROR_BREAK : 0) |
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((cc32xx_errs & UART_RXERROR_PARITY) ? UART_ERROR_PARITY : 0) |
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((cc32xx_errs & UART_RXERROR_FRAMING) ? UART_ERROR_FRAMING : 0);
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MAP_UARTRxErrorClear((unsigned long)config->base);
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return (int)z_err;
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}
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static int uart_cc32xx_fifo_fill(struct device *dev, const u8_t *tx_data,
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int size)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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unsigned int num_tx = 0;
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while ((size - num_tx) > 0) {
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/* Send a character */
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if (MAP_UARTCharPutNonBlocking((unsigned long)config->base,
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tx_data[num_tx])) {
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num_tx++;
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} else {
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break;
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}
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}
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return (int)num_tx;
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}
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static int uart_cc32xx_fifo_read(struct device *dev, u8_t *rx_data,
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const int size)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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unsigned int num_rx = 0;
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while (((size - num_rx) > 0) &&
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MAP_UARTCharsAvail((unsigned long)config->base)) {
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/* Receive a character */
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rx_data[num_rx++] =
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MAP_UARTCharGetNonBlocking((unsigned long)config->base);
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}
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return num_rx;
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}
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static void uart_cc32xx_irq_tx_enable(struct device *dev)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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MAP_UARTIntEnable((unsigned long)config->base, UART_INT_TX);
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}
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static void uart_cc32xx_irq_tx_disable(struct device *dev)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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MAP_UARTIntDisable((unsigned long)config->base, UART_INT_TX);
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}
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static int uart_cc32xx_irq_tx_ready(struct device *dev)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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unsigned int int_status;
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int_status = MAP_UARTIntStatus((unsigned long)config->base, 1);
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return (int_status & UART_INT_TX);
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}
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static void uart_cc32xx_irq_rx_enable(struct device *dev)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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/* FIFOs are left disabled from reset, so UART_INT_RT flag not used. */
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MAP_UARTIntEnable((unsigned long)config->base, UART_INT_RX);
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}
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static void uart_cc32xx_irq_rx_disable(struct device *dev)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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MAP_UARTIntDisable((unsigned long)config->base, UART_INT_RX);
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}
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static int uart_cc32xx_irq_tx_complete(struct device *dev)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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return (!MAP_UARTBusy((unsigned long)config->base));
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}
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static int uart_cc32xx_irq_rx_ready(struct device *dev)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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unsigned int int_status;
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int_status = MAP_UARTIntStatus((unsigned long)config->base, 1);
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return (int_status & UART_INT_RX);
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}
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static void uart_cc32xx_irq_err_enable(struct device *dev)
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{
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/* Not yet used in zephyr */
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}
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static void uart_cc32xx_irq_err_disable(struct device *dev)
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{
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/* Not yet used in zephyr */
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}
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static int uart_cc32xx_irq_is_pending(struct device *dev)
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{
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const struct uart_device_config *config = DEV_CFG(dev);
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unsigned int int_status;
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int_status = MAP_UARTIntStatus((unsigned long)config->base, 1);
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return (int_status & (UART_INT_TX | UART_INT_RX));
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}
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static int uart_cc32xx_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 uart_cc32xx_irq_callback_set(struct device *dev,
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uart_irq_callback_t cb)
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{
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struct uart_cc32xx_dev_data_t * const dev_data = DEV_DATA(dev);
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dev_data->cb = cb;
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}
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/**
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* @brief Interrupt service routine.
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*
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* This simply calls the callback function, if one exists.
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*
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* Note: CC32XX UART Tx interrupts when ready to send; Rx interrupts when char
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* received.
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*
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* @param arg Argument to ISR.
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*
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* @return N/A
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*/
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static void uart_cc32xx_isr(void *arg)
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{
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struct device *dev = arg;
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const struct uart_device_config *config = DEV_CFG(dev);
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struct uart_cc32xx_dev_data_t * const dev_data = DEV_DATA(dev);
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unsigned long intStatus = MAP_UARTIntStatus((unsigned long)config->base,
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1);
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if (dev_data->cb) {
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dev_data->cb(dev);
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}
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/*
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* Clear interrupts only after cb called, as Zephyr UART clients expect
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* to check interrupt status during the callback.
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*/
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MAP_UARTIntClear((unsigned long)config->base, intStatus);
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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static const struct uart_driver_api uart_cc32xx_driver_api = {
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.poll_in = uart_cc32xx_poll_in,
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.poll_out = uart_cc32xx_poll_out,
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.err_check = uart_cc32xx_err_check,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.fifo_fill = uart_cc32xx_fifo_fill,
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.fifo_read = uart_cc32xx_fifo_read,
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.irq_tx_enable = uart_cc32xx_irq_tx_enable,
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.irq_tx_disable = uart_cc32xx_irq_tx_disable,
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.irq_tx_ready = uart_cc32xx_irq_tx_ready,
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.irq_rx_enable = uart_cc32xx_irq_rx_enable,
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.irq_rx_disable = uart_cc32xx_irq_rx_disable,
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.irq_tx_complete = uart_cc32xx_irq_tx_complete,
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.irq_rx_ready = uart_cc32xx_irq_rx_ready,
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.irq_err_enable = uart_cc32xx_irq_err_enable,
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.irq_err_disable = uart_cc32xx_irq_err_disable,
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.irq_is_pending = uart_cc32xx_irq_is_pending,
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.irq_update = uart_cc32xx_irq_update,
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.irq_callback_set = uart_cc32xx_irq_callback_set,
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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};
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DEVICE_AND_API_INIT(uart_cc32xx_0, CONFIG_UART_CC32XX_NAME,
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uart_cc32xx_init, &uart_cc32xx_dev_data_0,
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&uart_cc32xx_dev_cfg_0,
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PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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(void *)&uart_cc32xx_driver_api);
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