476 lines
11 KiB
C
476 lines
11 KiB
C
/*
|
|
* Copyright (c) 2018 Justin Watson
|
|
* Copyright (c) 2016 Piotr Mienkowski
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/** @file
|
|
* @brief USART driver for Atmel SAM MCU family.
|
|
*
|
|
* Note:
|
|
* - Only basic USART features sufficient to support printf functionality
|
|
* are currently 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_USART_SAM_PORT_0 == 1
|
|
|
|
#if DT_USART_SAM_PORT_0_BAUD_RATE == 0
|
|
#error "DT_USART_SAM_PORT_0_BAUD_RATE has to be bigger than 0"
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#if CONFIG_USART_SAM_PORT_1 == 1
|
|
|
|
#if DT_USART_SAM_PORT_1_BAUD_RATE == 0
|
|
#error "DT_USART_SAM_PORT_1_BAUD_RATE has to be bigger than 0"
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#if CONFIG_USART_SAM_PORT_2 == 1
|
|
|
|
#if DT_USART_SAM_PORT_2_BAUD_RATE == 0
|
|
#error "DT_USART_SAM_PORT_2_BAUD_RATE has to be bigger than 0"
|
|
#endif
|
|
|
|
#endif
|
|
|
|
/* Device constant configuration parameters */
|
|
struct usart_sam_dev_cfg {
|
|
Usart *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 usart_sam_dev_data {
|
|
u32_t baud_rate;
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
uart_irq_callback_user_data_t irq_cb; /* Interrupt Callback */
|
|
void *cb_data; /* Interrupt Callback Arg */
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
};
|
|
|
|
#define DEV_CFG(dev) \
|
|
((const struct usart_sam_dev_cfg *const)(dev)->config->config_info)
|
|
#define DEV_DATA(dev) \
|
|
((struct usart_sam_dev_data *const)(dev)->driver_data)
|
|
|
|
|
|
static int baudrate_set(Usart *const usart, u32_t baudrate,
|
|
u32_t mck_freq_hz);
|
|
|
|
|
|
static int usart_sam_init(struct device *dev)
|
|
{
|
|
int retval;
|
|
const struct usart_sam_dev_cfg *const cfg = DEV_CFG(dev);
|
|
struct usart_sam_dev_data *const dev_data = DEV_DATA(dev);
|
|
Usart *const usart = cfg->regs;
|
|
|
|
/* Enable USART 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 USART */
|
|
usart->US_CR = US_CR_RSTRX | US_CR_RSTTX
|
|
| US_CR_RXDIS | US_CR_TXDIS | US_CR_RSTSTA;
|
|
|
|
/* Disable Interrupts */
|
|
usart->US_IDR = 0xFFFFFFFF;
|
|
|
|
/* 8 bits of data, no parity, 1 stop bit in normal mode */
|
|
usart->US_MR = US_MR_NBSTOP_1_BIT
|
|
| US_MR_PAR_NO
|
|
| US_MR_CHRL_8_BIT
|
|
| US_MR_USCLKS_MCK
|
|
| US_MR_CHMODE_NORMAL;
|
|
|
|
/* Set baud rate */
|
|
retval = baudrate_set(usart, dev_data->baud_rate,
|
|
SOC_ATMEL_SAM_MCK_FREQ_HZ);
|
|
if (retval != 0) {
|
|
return retval;
|
|
}
|
|
|
|
/* Enable receiver and transmitter */
|
|
usart->US_CR = US_CR_RXEN | US_CR_TXEN;
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
cfg->irq_config_func(dev);
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usart_sam_poll_in(struct device *dev, unsigned char *c)
|
|
{
|
|
Usart *const usart = DEV_CFG(dev)->regs;
|
|
|
|
if (!(usart->US_CSR & US_CSR_RXRDY)) {
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* got a character */
|
|
*c = (unsigned char)usart->US_RHR;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void usart_sam_poll_out(struct device *dev, unsigned char c)
|
|
{
|
|
Usart *const usart = DEV_CFG(dev)->regs;
|
|
|
|
/* Wait for transmitter to be ready */
|
|
while (!(usart->US_CSR & US_CSR_TXRDY)) {
|
|
;
|
|
}
|
|
|
|
/* send a character */
|
|
usart->US_THR = (u32_t)c;
|
|
}
|
|
|
|
static int usart_sam_err_check(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
int errors = 0;
|
|
|
|
if (usart->US_CSR & US_CSR_OVRE) {
|
|
errors |= UART_ERROR_OVERRUN;
|
|
}
|
|
|
|
if (usart->US_CSR & US_CSR_PARE) {
|
|
errors |= UART_ERROR_PARITY;
|
|
}
|
|
|
|
if (usart->US_CSR & US_CSR_FRAME) {
|
|
errors |= UART_ERROR_FRAMING;
|
|
}
|
|
|
|
return errors;
|
|
}
|
|
|
|
static int baudrate_set(Usart *const usart, 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;
|
|
}
|
|
|
|
usart->US_BRGR = US_BRGR_CD(divisor);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if CONFIG_UART_INTERRUPT_DRIVEN
|
|
|
|
static int usart_sam_fifo_fill(struct device *dev, const uint8_t *tx_data,
|
|
int size)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
/* Wait for transmitter to be ready. */
|
|
while ((usart->US_CSR & US_CSR_TXRDY) == 0) {
|
|
;
|
|
}
|
|
|
|
usart->US_THR = *tx_data;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int usart_sam_fifo_read(struct device *dev, uint8_t *rx_data,
|
|
const int size)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
int bytes_read;
|
|
|
|
bytes_read = 0;
|
|
|
|
while (bytes_read < size) {
|
|
if (usart->US_CSR & US_CSR_RXRDY) {
|
|
rx_data[bytes_read] = usart->US_RHR;
|
|
bytes_read++;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return bytes_read;
|
|
}
|
|
|
|
static void usart_sam_irq_tx_enable(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
usart->US_IER = US_IER_TXRDY;
|
|
}
|
|
|
|
static void usart_sam_irq_tx_disable(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
usart->US_IDR = US_IDR_TXRDY;
|
|
}
|
|
|
|
static int usart_sam_irq_tx_ready(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
return (usart->US_CSR & US_CSR_TXRDY);
|
|
}
|
|
|
|
static void usart_sam_irq_rx_enable(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
usart->US_IER = US_IER_RXRDY;
|
|
}
|
|
|
|
static void usart_sam_irq_rx_disable(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
usart->US_IDR = US_IDR_RXRDY;
|
|
}
|
|
|
|
static int usart_sam_irq_tx_complete(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
return !(usart->US_CSR & US_CSR_TXRDY);
|
|
}
|
|
|
|
static int usart_sam_irq_rx_ready(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
return (usart->US_CSR & US_CSR_RXRDY);
|
|
}
|
|
|
|
static void usart_sam_irq_err_enable(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
usart->US_IER = US_IER_OVRE | US_IER_FRAME | US_IER_PARE;
|
|
}
|
|
|
|
static void usart_sam_irq_err_disable(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
usart->US_IDR = US_IDR_OVRE | US_IDR_FRAME | US_IDR_PARE;
|
|
}
|
|
|
|
static int usart_sam_irq_is_pending(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
return ((usart->US_CSR & US_CSR_TXRDY)
|
|
| (usart->US_CSR & US_CSR_RXRDY));
|
|
}
|
|
|
|
static int usart_sam_irq_update(struct device *dev)
|
|
{
|
|
volatile Usart * const usart = DEV_CFG(dev)->regs;
|
|
|
|
return (usart->US_CSR & US_CSR_TXEMPTY);
|
|
}
|
|
|
|
static void usart_sam_irq_callback_set(struct device *dev,
|
|
uart_irq_callback_user_data_t cb,
|
|
void *cb_data)
|
|
{
|
|
struct usart_sam_dev_data *const dev_data = DEV_DATA(dev);
|
|
|
|
dev_data->irq_cb = cb;
|
|
dev_data->cb_data = cb_data;
|
|
}
|
|
|
|
static void usart_sam_isr(void *arg)
|
|
{
|
|
struct device *dev = arg;
|
|
struct usart_sam_dev_data *const dev_data = DEV_DATA(dev);
|
|
|
|
if (dev_data->irq_cb) {
|
|
dev_data->irq_cb(dev_data->cb_data);
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
static const struct uart_driver_api usart_sam_driver_api = {
|
|
.poll_in = usart_sam_poll_in,
|
|
.poll_out = usart_sam_poll_out,
|
|
.err_check = usart_sam_err_check,
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.fifo_fill = usart_sam_fifo_fill,
|
|
.fifo_read = usart_sam_fifo_read,
|
|
.irq_tx_enable = usart_sam_irq_tx_enable,
|
|
.irq_tx_disable = usart_sam_irq_tx_disable,
|
|
.irq_tx_ready = usart_sam_irq_tx_ready,
|
|
.irq_rx_enable = usart_sam_irq_rx_enable,
|
|
.irq_rx_disable = usart_sam_irq_rx_disable,
|
|
.irq_tx_complete = usart_sam_irq_tx_complete,
|
|
.irq_rx_ready = usart_sam_irq_rx_ready,
|
|
.irq_err_enable = usart_sam_irq_err_enable,
|
|
.irq_err_disable = usart_sam_irq_err_disable,
|
|
.irq_is_pending = usart_sam_irq_is_pending,
|
|
.irq_update = usart_sam_irq_update,
|
|
.irq_callback_set = usart_sam_irq_callback_set,
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
};
|
|
|
|
/* USART0 */
|
|
|
|
#ifdef CONFIG_USART_SAM_PORT_0
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
/* Forward declare function */
|
|
static void usart0_sam_irq_config_func(struct device *port);
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
static const struct usart_sam_dev_cfg usart0_sam_config = {
|
|
.regs = USART0,
|
|
.periph_id = DT_USART_SAM_PORT_0_PERIPHERAL_ID,
|
|
.pin_rx = PIN_USART0_RXD,
|
|
.pin_tx = PIN_USART0_TXD,
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.irq_config_func = usart0_sam_irq_config_func,
|
|
#endif
|
|
};
|
|
|
|
static struct usart_sam_dev_data usart0_sam_data = {
|
|
.baud_rate = DT_USART_SAM_PORT_0_BAUD_RATE,
|
|
};
|
|
|
|
DEVICE_AND_API_INIT(usart0_sam, DT_USART_SAM_PORT_0_NAME, &usart_sam_init,
|
|
&usart0_sam_data, &usart0_sam_config, PRE_KERNEL_1,
|
|
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &usart_sam_driver_api);
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
static void usart0_sam_irq_config_func(struct device *port)
|
|
{
|
|
IRQ_CONNECT(DT_USART_SAM_PORT_0_IRQ,
|
|
DT_USART_SAM_PORT_0_IRQ_PRIO,
|
|
usart_sam_isr,
|
|
DEVICE_GET(usart0_sam), 0);
|
|
irq_enable(DT_USART_SAM_PORT_0_IRQ);
|
|
}
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
#endif
|
|
|
|
/* USART1 */
|
|
|
|
#ifdef CONFIG_USART_SAM_PORT_1
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
/* Forward declare function */
|
|
static void usart1_sam_irq_config_func(struct device *port);
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
static const struct usart_sam_dev_cfg usart1_sam_config = {
|
|
.regs = USART1,
|
|
.periph_id = DT_USART_SAM_PORT_1_PERIPHERAL_ID,
|
|
.pin_rx = PIN_USART1_RXD,
|
|
.pin_tx = PIN_USART1_TXD,
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.irq_config_func = usart1_sam_irq_config_func,
|
|
#endif
|
|
};
|
|
|
|
static struct usart_sam_dev_data usart1_sam_data = {
|
|
.baud_rate = DT_USART_SAM_PORT_1_BAUD_RATE,
|
|
};
|
|
|
|
DEVICE_AND_API_INIT(usart1_sam, DT_USART_SAM_PORT_1_NAME, &usart_sam_init,
|
|
&usart1_sam_data, &usart1_sam_config, PRE_KERNEL_1,
|
|
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &usart_sam_driver_api);
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
static void usart1_sam_irq_config_func(struct device *port)
|
|
{
|
|
IRQ_CONNECT(DT_USART_SAM_PORT_1_IRQ,
|
|
DT_USART_SAM_PORT_1_IRQ_PRIO,
|
|
usart_sam_isr,
|
|
DEVICE_GET(usart1_sam), 0);
|
|
irq_enable(DT_USART_SAM_PORT_1_IRQ);
|
|
}
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
#endif
|
|
|
|
/* USART2 */
|
|
|
|
#ifdef CONFIG_USART_SAM_PORT_2
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
/* Forward declare function */
|
|
static void usart2_sam_irq_config_func(struct device *port);
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
static const struct usart_sam_dev_cfg usart2_sam_config = {
|
|
.regs = USART2,
|
|
.periph_id = DT_USART_SAM_PORT_2_PERIPHERAL_ID,
|
|
.pin_rx = PIN_USART2_RXD,
|
|
.pin_tx = PIN_USART2_TXD,
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.irq_config_func = usart2_sam_irq_config_func,
|
|
#endif
|
|
};
|
|
|
|
static struct usart_sam_dev_data usart2_sam_data = {
|
|
.baud_rate = DT_USART_SAM_PORT_2_BAUD_RATE,
|
|
};
|
|
|
|
DEVICE_AND_API_INIT(usart2_sam, DT_USART_SAM_PORT_2_NAME, &usart_sam_init,
|
|
&usart2_sam_data, &usart2_sam_config, PRE_KERNEL_1,
|
|
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &usart_sam_driver_api);
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
static void usart2_sam_irq_config_func(struct device *port)
|
|
{
|
|
IRQ_CONNECT(DT_USART_SAM_PORT_2_IRQ,
|
|
DT_USART_SAM_PORT_2_IRQ_PRIO,
|
|
usart_sam_isr,
|
|
DEVICE_GET(usart2_sam), 0);
|
|
irq_enable(DT_USART_SAM_PORT_2_IRQ);
|
|
}
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
#endif
|