570 lines
13 KiB
C
570 lines
13 KiB
C
/*
|
|
* Copyright (c) 2017 Piotr Mienkowski
|
|
* Copyright (c) 2018 Justin Watson
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/** @file
|
|
* @brief UART driver for Atmel SAM MCU family.
|
|
*
|
|
* Note:
|
|
* - Error handling is not implemented.
|
|
* - The driver works only in polling mode, interrupt mode is not implemented.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <misc/__assert.h>
|
|
#include <device.h>
|
|
#include <init.h>
|
|
#include <soc.h>
|
|
#include <uart.h>
|
|
|
|
/*
|
|
* Verify Kconfig configuration
|
|
*/
|
|
|
|
#if CONFIG_UART_SAM_PORT_0 == 1
|
|
|
|
#if DT_UART_SAM_PORT_0_BAUD_RATE == 0
|
|
#error "DT_UART_SAM_PORT_0_BAUD_RATE has to be bigger than 0"
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#if CONFIG_UART_SAM_PORT_1 == 1
|
|
|
|
#if DT_UART_SAM_PORT_1_BAUD_RATE == 0
|
|
#error "DT_UART_SAM_PORT_1_BAUD_RATE has to be bigger than 0"
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#if CONFIG_UART_SAM_PORT_2 == 1
|
|
|
|
#if DT_UART_SAM_PORT_2_BAUD_RATE == 0
|
|
#error "DT_UART_SAM_PORT_2_BAUD_RATE has to be bigger than 0"
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#if CONFIG_UART_SAM_PORT_3 == 1
|
|
|
|
#if DT_UART_SAM_PORT_3_BAUD_RATE == 0
|
|
#error "DT_UART_SAM_PORT_3_BAUD_RATE has to be bigger than 0"
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#if CONFIG_UART_SAM_PORT_4 == 1
|
|
|
|
#if DT_UART_SAM_PORT_4_BAUD_RATE == 0
|
|
#error "DT_UART_SAM_PORT_4_BAUD_RATE has to be bigger than 0"
|
|
#endif
|
|
|
|
#endif
|
|
|
|
/* Device constant configuration parameters */
|
|
struct uart_sam_dev_cfg {
|
|
Uart *regs;
|
|
u32_t periph_id;
|
|
struct soc_gpio_pin pin_rx;
|
|
struct soc_gpio_pin pin_tx;
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
uart_irq_config_func_t irq_config_func;
|
|
#endif
|
|
};
|
|
|
|
/* Device run time data */
|
|
struct uart_sam_dev_data {
|
|
u32_t baud_rate;
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
uart_irq_callback_user_data_t irq_cb; /* Interrupt Callback */
|
|
void *irq_cb_data; /* Interrupt Callback Arg */
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
};
|
|
|
|
#define DEV_CFG(dev) \
|
|
((const struct uart_sam_dev_cfg *const)(dev)->config->config_info)
|
|
#define DEV_DATA(dev) \
|
|
((struct uart_sam_dev_data *const)(dev)->driver_data)
|
|
|
|
|
|
static int baudrate_set(Uart *const uart, u32_t baudrate,
|
|
u32_t mck_freq_hz);
|
|
|
|
|
|
static int uart_sam_init(struct device *dev)
|
|
{
|
|
int retval;
|
|
const struct uart_sam_dev_cfg *const cfg = DEV_CFG(dev);
|
|
struct uart_sam_dev_data *const dev_data = DEV_DATA(dev);
|
|
Uart *const uart = cfg->regs;
|
|
|
|
/* Enable UART clock in PMC */
|
|
soc_pmc_peripheral_enable(cfg->periph_id);
|
|
|
|
/* Connect pins to the peripheral */
|
|
soc_gpio_configure(&cfg->pin_rx);
|
|
soc_gpio_configure(&cfg->pin_tx);
|
|
|
|
/* Reset and disable UART */
|
|
uart->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX
|
|
| UART_CR_RXDIS | UART_CR_TXDIS | UART_CR_RSTSTA;
|
|
|
|
/* Disable Interrupts */
|
|
uart->UART_IDR = 0xFFFFFFFF;
|
|
|
|
/* 8 bits of data, no parity, 1 stop bit in normal mode, baud rate
|
|
* driven by the peripheral clock, UART does not filter the receive line
|
|
*/
|
|
uart->UART_MR = UART_MR_PAR_NO
|
|
| UART_MR_CHMODE_NORMAL;
|
|
|
|
/* Set baud rate */
|
|
retval = baudrate_set(uart, dev_data->baud_rate,
|
|
SOC_ATMEL_SAM_MCK_FREQ_HZ);
|
|
if (retval != 0) {
|
|
return retval;
|
|
}
|
|
|
|
/* Enable receiver and transmitter */
|
|
uart->UART_CR = UART_CR_RXEN | UART_CR_TXEN;
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
cfg->irq_config_func(dev);
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int uart_sam_poll_in(struct device *dev, unsigned char *c)
|
|
{
|
|
Uart *const uart = DEV_CFG(dev)->regs;
|
|
|
|
if (!(uart->UART_SR & UART_SR_RXRDY)) {
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* got a character */
|
|
*c = (unsigned char)uart->UART_RHR;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void uart_sam_poll_out(struct device *dev, unsigned char c)
|
|
{
|
|
Uart *const uart = DEV_CFG(dev)->regs;
|
|
|
|
/* Wait for transmitter to be ready */
|
|
while (!(uart->UART_SR & UART_SR_TXRDY))
|
|
;
|
|
|
|
/* send a character */
|
|
uart->UART_THR = (u32_t)c;
|
|
}
|
|
|
|
static int uart_sam_err_check(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
int errors = 0;
|
|
|
|
if (uart->UART_SR & UART_SR_OVRE) {
|
|
errors |= UART_ERROR_OVERRUN;
|
|
}
|
|
|
|
if (uart->UART_SR & UART_SR_PARE) {
|
|
errors |= UART_ERROR_PARITY;
|
|
}
|
|
|
|
if (uart->UART_SR & UART_SR_FRAME) {
|
|
errors |= UART_ERROR_FRAMING;
|
|
}
|
|
|
|
return errors;
|
|
}
|
|
|
|
static int baudrate_set(Uart *const uart, u32_t baudrate,
|
|
u32_t mck_freq_hz)
|
|
{
|
|
u32_t divisor;
|
|
|
|
__ASSERT(baudrate,
|
|
"baud rate has to be bigger than 0");
|
|
__ASSERT(mck_freq_hz/16 >= baudrate,
|
|
"MCK frequency is too small to set required baud rate");
|
|
|
|
divisor = mck_freq_hz / 16 / baudrate;
|
|
|
|
if (divisor > 0xFFFF) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
uart->UART_BRGR = UART_BRGR_CD(divisor);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
|
|
static int uart_sam_fifo_fill(struct device *dev, const uint8_t *tx_data,
|
|
int size)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
/* Wait for transmitter to be ready. */
|
|
while ((uart->UART_SR & UART_SR_TXRDY) == 0)
|
|
;
|
|
|
|
uart->UART_THR = *tx_data;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int uart_sam_fifo_read(struct device *dev, uint8_t *rx_data,
|
|
const int size)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
int bytes_read;
|
|
|
|
bytes_read = 0;
|
|
|
|
while (bytes_read < size) {
|
|
if (uart->UART_SR & UART_SR_RXRDY) {
|
|
rx_data[bytes_read] = uart->UART_RHR;
|
|
bytes_read++;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return bytes_read;
|
|
}
|
|
|
|
static void uart_sam_irq_tx_enable(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
uart->UART_IER = UART_IER_TXRDY;
|
|
}
|
|
|
|
static void uart_sam_irq_tx_disable(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
uart->UART_IDR = UART_IDR_TXRDY;
|
|
}
|
|
|
|
static int uart_sam_irq_tx_ready(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
return (uart->UART_SR & UART_SR_TXRDY);
|
|
}
|
|
|
|
static void uart_sam_irq_rx_enable(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
uart->UART_IER = UART_IER_RXRDY;
|
|
}
|
|
|
|
static void uart_sam_irq_rx_disable(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
uart->UART_IDR = UART_IDR_RXRDY;
|
|
}
|
|
|
|
static int uart_sam_irq_tx_complete(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
return !(uart->UART_SR & UART_SR_TXRDY);
|
|
}
|
|
|
|
static int uart_sam_irq_rx_ready(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
return (uart->UART_SR & UART_SR_RXRDY);
|
|
}
|
|
|
|
static void uart_sam_irq_err_enable(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
uart->UART_IER = UART_IER_OVRE | UART_IER_FRAME | UART_IER_PARE;
|
|
}
|
|
|
|
static void uart_sam_irq_err_disable(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
uart->UART_IDR = UART_IDR_OVRE | UART_IDR_FRAME | UART_IDR_PARE;
|
|
}
|
|
|
|
static int uart_sam_irq_is_pending(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
return ((uart->UART_SR & UART_SR_TXRDY)
|
|
| (uart->UART_SR & UART_SR_RXRDY));
|
|
}
|
|
|
|
static int uart_sam_irq_update(struct device *dev)
|
|
{
|
|
volatile Uart * const uart = DEV_CFG(dev)->regs;
|
|
|
|
return (uart->UART_SR & UART_SR_TXEMPTY);
|
|
}
|
|
|
|
static void uart_sam_irq_callback_set(struct device *dev,
|
|
uart_irq_callback_user_data_t cb,
|
|
void *cb_data)
|
|
{
|
|
struct uart_sam_dev_data *const dev_data = DEV_DATA(dev);
|
|
|
|
dev_data->irq_cb = cb;
|
|
dev_data->irq_cb_data = cb_data;
|
|
}
|
|
|
|
static void uart_sam_isr(void *arg)
|
|
{
|
|
struct device *dev = arg;
|
|
struct uart_sam_dev_data *const dev_data = DEV_DATA(dev);
|
|
|
|
if (dev_data->irq_cb) {
|
|
dev_data->irq_cb(dev_data->irq_cb_data);
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
static const struct uart_driver_api uart_sam_driver_api = {
|
|
.poll_in = uart_sam_poll_in,
|
|
.poll_out = uart_sam_poll_out,
|
|
.err_check = uart_sam_err_check,
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.fifo_fill = uart_sam_fifo_fill,
|
|
.fifo_read = uart_sam_fifo_read,
|
|
.irq_tx_enable = uart_sam_irq_tx_enable,
|
|
.irq_tx_disable = uart_sam_irq_tx_disable,
|
|
.irq_tx_ready = uart_sam_irq_tx_ready,
|
|
.irq_rx_enable = uart_sam_irq_rx_enable,
|
|
.irq_rx_disable = uart_sam_irq_rx_disable,
|
|
.irq_tx_complete = uart_sam_irq_tx_complete,
|
|
.irq_rx_ready = uart_sam_irq_rx_ready,
|
|
.irq_err_enable = uart_sam_irq_err_enable,
|
|
.irq_err_disable = uart_sam_irq_err_disable,
|
|
.irq_is_pending = uart_sam_irq_is_pending,
|
|
.irq_update = uart_sam_irq_update,
|
|
.irq_callback_set = uart_sam_irq_callback_set,
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
};
|
|
|
|
/* UART0 */
|
|
|
|
#ifdef CONFIG_UART_SAM_PORT_0
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
/* Forward declare function */
|
|
static void uart0_sam_irq_config_func(struct device *port);
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
static const struct uart_sam_dev_cfg uart0_sam_config = {
|
|
.regs = UART0,
|
|
.periph_id = ID_UART0,
|
|
.pin_rx = PIN_UART0_RXD,
|
|
.pin_tx = PIN_UART0_TXD,
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.irq_config_func = uart0_sam_irq_config_func,
|
|
#endif
|
|
};
|
|
|
|
static struct uart_sam_dev_data uart0_sam_data = {
|
|
.baud_rate = DT_UART_SAM_PORT_0_BAUD_RATE,
|
|
};
|
|
|
|
DEVICE_AND_API_INIT(uart0_sam, DT_UART_SAM_PORT_0_NAME, &uart_sam_init,
|
|
&uart0_sam_data, &uart0_sam_config, PRE_KERNEL_1,
|
|
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &uart_sam_driver_api);
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
static void uart0_sam_irq_config_func(struct device *port)
|
|
{
|
|
IRQ_CONNECT(DT_UART_SAM_PORT_0_IRQ,
|
|
DT_UART_SAM_PORT_0_IRQ_PRIO,
|
|
uart_sam_isr,
|
|
DEVICE_GET(uart0_sam), 0);
|
|
irq_enable(DT_UART_SAM_PORT_0_IRQ);
|
|
}
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
#endif /* CONFIG_UART_SAM_PORT_0 */
|
|
|
|
/* UART1 */
|
|
|
|
#ifdef CONFIG_UART_SAM_PORT_1
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
/* Forward declare function */
|
|
static void uart1_sam_irq_config_func(struct device *port);
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
static const struct uart_sam_dev_cfg uart1_sam_config = {
|
|
.regs = UART1,
|
|
.periph_id = ID_UART1,
|
|
.pin_rx = PIN_UART1_RXD,
|
|
.pin_tx = PIN_UART1_TXD,
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.irq_config_func = uart1_sam_irq_config_func,
|
|
#endif
|
|
};
|
|
|
|
static struct uart_sam_dev_data uart1_sam_data = {
|
|
.baud_rate = DT_UART_SAM_PORT_1_BAUD_RATE,
|
|
};
|
|
|
|
DEVICE_AND_API_INIT(uart1_sam, DT_UART_SAM_PORT_1_NAME, &uart_sam_init,
|
|
&uart1_sam_data, &uart1_sam_config, PRE_KERNEL_1,
|
|
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &uart_sam_driver_api);
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
static void uart1_sam_irq_config_func(struct device *port)
|
|
{
|
|
IRQ_CONNECT(DT_UART_SAM_PORT_1_IRQ,
|
|
DT_UART_SAM_PORT_1_IRQ_PRIO,
|
|
uart_sam_isr,
|
|
DEVICE_GET(uart1_sam), 0);
|
|
irq_enable(DT_UART_SAM_PORT_1_IRQ);
|
|
}
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
#endif /* CONFIG_UART_SAM_PORT_1 */
|
|
|
|
/* UART2 */
|
|
|
|
#ifdef CONFIG_UART_SAM_PORT_2
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
/* Forward declare function */
|
|
static void uart2_sam_irq_config_func(struct device *port);
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
static const struct uart_sam_dev_cfg uart2_sam_config = {
|
|
.regs = UART2,
|
|
.periph_id = ID_UART2,
|
|
.pin_rx = PIN_UART2_RXD,
|
|
.pin_tx = PIN_UART2_TXD,
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.irq_config_func = uart2_sam_irq_config_func,
|
|
#endif
|
|
};
|
|
|
|
static struct uart_sam_dev_data uart2_sam_data = {
|
|
.baud_rate = DT_UART_SAM_PORT_2_BAUD_RATE,
|
|
};
|
|
|
|
DEVICE_AND_API_INIT(uart2_sam, DT_UART_SAM_PORT_2_NAME, &uart_sam_init,
|
|
&uart2_sam_data, &uart2_sam_config, PRE_KERNEL_1,
|
|
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &uart_sam_driver_api);
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
static void uart2_sam_irq_config_func(struct device *port)
|
|
{
|
|
IRQ_CONNECT(DT_UART_SAM_PORT_2_IRQ,
|
|
DT_UART_SAM_PORT_2_IRQ_PRIO,
|
|
uart_sam_isr,
|
|
DEVICE_GET(uart2_sam), 0);
|
|
irq_enable(DT_UART_SAM_PORT_2_IRQ);
|
|
}
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
#endif
|
|
|
|
/* UART3 */
|
|
|
|
#ifdef CONFIG_UART_SAM_PORT_3
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
/* Forward declare function */
|
|
static void uart3_sam_irq_config_func(struct device *port);
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
static const struct uart_sam_dev_cfg uart3_sam_config = {
|
|
.regs = UART3,
|
|
.periph_id = ID_UART3,
|
|
.pin_rx = PIN_UART3_RXD,
|
|
.pin_tx = PIN_UART3_TXD,
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.irq_config_func = uart3_sam_irq_config_func,
|
|
#endif
|
|
};
|
|
|
|
static struct uart_sam_dev_data uart3_sam_data = {
|
|
.baud_rate = DT_UART_SAM_PORT_3_BAUD_RATE,
|
|
};
|
|
|
|
DEVICE_AND_API_INIT(uart3_sam, DT_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(DT_UART_SAM_PORT_3_IRQ,
|
|
DT_UART_SAM_PORT_3_IRQ_PRIO,
|
|
uart_sam_isr,
|
|
DEVICE_GET(uart3_sam), 0);
|
|
irq_enable(DT_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 = DT_UART_SAM_PORT_4_BAUD_RATE,
|
|
};
|
|
|
|
DEVICE_AND_API_INIT(uart4_sam, DT_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(DT_UART_SAM_PORT_4_IRQ,
|
|
DT_UART_SAM_PORT_4_IRQ_PRIO,
|
|
uart_sam_isr,
|
|
DEVICE_GET(uart4_sam), 0);
|
|
irq_enable(DT_UART_SAM_PORT_4_IRQ);
|
|
}
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
#endif
|