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zephyr/drivers/serial/uart_fe310.c
Jens Peter Schroer b676bfafc8 drivers: serial: uart_fe310: fix function definiton name for UART1 IRQ 
This commit fixes the compilation error that occurs if both UART
ports on the FE310 SoC are enabled. The error occurs due to the
missing function definition of uart_fe310_irq_cfg_func_1 .

Signed-off-by: Jens Peter Schroer <jens@manetos.com>
2017-06-07 12:17:15 -05:00

452 lines
10 KiB
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/*
* Copyright (c) 2017 Jean-Paul Etienne <fractalclone@gmail.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @brief UART driver for the SiFive Freedom E310 Processor
*/
#include <kernel.h>
#include <arch/cpu.h>
#include <uart.h>
#include <board.h>
#define RXDATA_EMPTY (1 << 31) /* Receive FIFO Empty */
#define RXDATA_MASK 0xFF /* Receive Data Mask */
#define TXDATA_FULL (1 << 31) /* Transmit FIFO Full */
#define TXCTRL_TXEN (1 << 0) /* Activate Tx Channel */
#define RXCTRL_RXEN (1 << 0) /* Activate Rx Channel */
#define IE_TXWM (1 << 0) /* TX Interrupt Enable/Pending */
#define IE_RXWM (1 << 1) /* RX Interrupt Enable/Pending */
/*
* RX/TX Threshold count to generate TX/RX Interrupts.
* Used by txctrl and rxctrl registers
*/
#define CTRL_CNT(x) (((x) & 0x07) << 16)
struct uart_fe310_regs_t {
u32_t tx;
u32_t rx;
u32_t txctrl;
u32_t rxctrl;
u32_t ie;
u32_t ip;
u32_t div;
};
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
typedef void (*irq_cfg_func_t)(void);
#endif
struct uart_fe310_device_config {
u32_t port;
u32_t sys_clk_freq;
u32_t baud_rate;
u32_t rxcnt_irq;
u32_t txcnt_irq;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
irq_cfg_func_t cfg_func;
#endif
};
struct uart_fe310_data {
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
uart_irq_callback_t callback;
#endif
};
#define DEV_CFG(dev) \
((const struct uart_fe310_device_config * const) \
(dev)->config->config_info)
#define DEV_UART(dev) \
((struct uart_fe310_regs_t *)(DEV_CFG(dev))->port)
#define DEV_DATA(dev) \
((struct uart_fe310_data * const)(dev)->driver_data)
/**
* @brief Output a character in polled mode.
*
* Writes data to tx register if transmitter is not full.
*
* @param dev UART device struct
* @param c Character to send
*
* @return Sent character
*/
static unsigned char uart_fe310_poll_out(struct device *dev,
unsigned char c)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
/* Wait while TX FIFO is full */
while (uart->tx & TXDATA_FULL)
;
uart->tx = (int)c;
return c;
}
/**
* @brief Poll the device for input.
*
* @param dev UART device struct
* @param c Pointer to character
*
* @return 0 if a character arrived, -1 if the input buffer if empty.
*/
static int uart_fe310_poll_in(struct device *dev, unsigned char *c)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
u32_t val = uart->rx;
if (val & RXDATA_EMPTY)
return -1;
*c = (unsigned char)(val & RXDATA_MASK);
return 0;
}
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
/**
* @brief Fill FIFO with data
*
* @param dev UART device struct
* @param tx_data Data to transmit
* @param size Number of bytes to send
*
* @return Number of bytes sent
*/
static int uart_fe310_fifo_fill(struct device *dev,
const u8_t *tx_data,
int size)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
int i;
for (i = 0; i < size && !(uart->tx & TXDATA_FULL); i++)
uart->tx = (int)tx_data[i];
return i;
}
/**
* @brief Read data from FIFO
*
* @param dev UART device struct
* @param rxData Data container
* @param size Container size
*
* @return Number of bytes read
*/
static int uart_fe310_fifo_read(struct device *dev,
u8_t *rx_data,
const int size)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
int i;
u32_t val;
for (i = 0; i < size; i++) {
val = uart->rx;
if (val & RXDATA_EMPTY)
break;
rx_data[i] = (u8_t)(val & RXDATA_MASK);
}
return i;
}
/**
* @brief Enable TX interrupt in ie register
*
* @param dev UART device struct
*
* @return N/A
*/
static void uart_fe310_irq_tx_enable(struct device *dev)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
uart->ie |= IE_TXWM;
}
/**
* @brief Disable TX interrupt in ie register
*
* @param dev UART device struct
*
* @return N/A
*/
static void uart_fe310_irq_tx_disable(struct device *dev)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
uart->ie &= ~IE_TXWM;
}
/**
* @brief Check if Tx IRQ has been raised
*
* @param dev UART device struct
*
* @return 1 if an IRQ is ready, 0 otherwise
*/
static int uart_fe310_irq_tx_ready(struct device *dev)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
return !!(uart->ip & IE_TXWM);
}
/**
* @brief Check if nothing remains to be transmitted
*
* @param dev UART device struct
*
* @return 1 if nothing remains to be transmitted, 0 otherwise
*/
static int uart_fe310_irq_tx_complete(struct device *dev)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
/*
* No TX EMTPY flag for this controller,
* just check if TX FIFO is not full
*/
return !(uart->tx & TXDATA_FULL);
}
/**
* @brief Enable RX interrupt in ie register
*
* @param dev UART device struct
*
* @return N/A
*/
static void uart_fe310_irq_rx_enable(struct device *dev)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
uart->ie |= IE_RXWM;
}
/**
* @brief Disable RX interrupt in ie register
*
* @param dev UART device struct
*
* @return N/A
*/
static void uart_fe310_irq_rx_disable(struct device *dev)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
uart->ie &= ~IE_RXWM;
}
/**
* @brief Check if Rx IRQ has been raised
*
* @param dev UART device struct
*
* @return 1 if an IRQ is ready, 0 otherwise
*/
static int uart_fe310_irq_rx_ready(struct device *dev)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
return !!(uart->ip & IE_RXWM);
}
/* No error interrupt for this controller */
static void uart_fe310_irq_err_enable(struct device *dev)
{
ARG_UNUSED(dev);
}
static void uart_fe310_irq_err_disable(struct device *dev)
{
ARG_UNUSED(dev);
}
/**
* @brief Check if any IRQ is pending
*
* @param dev UART device struct
*
* @return 1 if an IRQ is pending, 0 otherwise
*/
static int uart_fe310_irq_is_pending(struct device *dev)
{
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
return !!(uart->ip & (IE_RXWM | IE_TXWM));
}
static int uart_fe310_irq_update(struct device *dev)
{
return 1;
}
/**
* @brief Set the callback function pointer for IRQ.
*
* @param dev UART device struct
* @param cb Callback function pointer.
*
* @return N/A
*/
static void uart_fe310_irq_callback_set(struct device *dev,
uart_irq_callback_t cb)
{
struct uart_fe310_data *data = DEV_DATA(dev);
data->callback = cb;
}
static void uart_fe310_irq_handler(void *arg)
{
struct device *dev = (struct device *)arg;
struct uart_fe310_data *data = DEV_DATA(dev);
if (data->callback)
data->callback(dev);
}
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
static int uart_fe310_init(struct device *dev)
{
const struct uart_fe310_device_config * const cfg = DEV_CFG(dev);
volatile struct uart_fe310_regs_t *uart = DEV_UART(dev);
/* Enable TX and RX channels */
uart->txctrl = TXCTRL_TXEN | CTRL_CNT(cfg->rxcnt_irq);
uart->rxctrl = RXCTRL_RXEN | CTRL_CNT(cfg->txcnt_irq);
/* Set baud rate */
uart->div = cfg->sys_clk_freq / cfg->baud_rate - 1;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
/* Ensure that uart IRQ is disabled initially */
uart->ie = 0;
/* Setup IRQ handler */
cfg->cfg_func();
#endif
return 0;
}
static const struct uart_driver_api uart_fe310_driver_api = {
.poll_in = uart_fe310_poll_in,
.poll_out = uart_fe310_poll_out,
.err_check = NULL,
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.fifo_fill = uart_fe310_fifo_fill,
.fifo_read = uart_fe310_fifo_read,
.irq_tx_enable = uart_fe310_irq_tx_enable,
.irq_tx_disable = uart_fe310_irq_tx_disable,
.irq_tx_ready = uart_fe310_irq_tx_ready,
.irq_tx_complete = uart_fe310_irq_tx_complete,
.irq_rx_enable = uart_fe310_irq_rx_enable,
.irq_rx_disable = uart_fe310_irq_rx_disable,
.irq_rx_ready = uart_fe310_irq_rx_ready,
.irq_err_enable = uart_fe310_irq_err_enable,
.irq_err_disable = uart_fe310_irq_err_disable,
.irq_is_pending = uart_fe310_irq_is_pending,
.irq_update = uart_fe310_irq_update,
.irq_callback_set = uart_fe310_irq_callback_set,
#endif
};
#ifdef CONFIG_UART_FE310_PORT_0
static struct uart_fe310_data uart_fe310_data_0;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static void uart_fe310_irq_cfg_func_0(void);
#endif
static const struct uart_fe310_device_config uart_fe310_dev_cfg_0 = {
.port = FE310_UART_0_BASE_ADDR,
.sys_clk_freq = uart_fe310_port_0_clk_freq,
.baud_rate = CONFIG_UART_FE310_PORT_0_BAUD_RATE,
.rxcnt_irq = CONFIG_UART_FE310_PORT_0_RXCNT_IRQ,
.txcnt_irq = CONFIG_UART_FE310_PORT_0_TXCNT_IRQ,
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.cfg_func = uart_fe310_irq_cfg_func_0,
#endif
};
DEVICE_AND_API_INIT(uart_fe310_0, CONFIG_UART_FE310_PORT_0_NAME,
uart_fe310_init,
&uart_fe310_data_0, &uart_fe310_dev_cfg_0,
PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
(void *)&uart_fe310_driver_api);
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static void uart_fe310_irq_cfg_func_0(void)
{
IRQ_CONNECT(FE310_UART_0_IRQ,
CONFIG_UART_FE310_PORT_0_IRQ_PRIORITY,
uart_fe310_irq_handler, DEVICE_GET(uart_fe310_0),
0);
irq_enable(FE310_UART_0_IRQ);
}
#endif
#endif /* CONFIG_FE310_UART_0 */
#ifdef CONFIG_UART_FE310_PORT_1
static struct uart_fe310_data uart_fe310_data_1;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static void uart_fe310_irq_cfg_func_1(void);
#endif
static const struct uart_fe310_device_config uart_fe310_dev_cfg_1 = {
.port = FE310_UART_1_BASE_ADDR,
.sys_clk_freq = uart_fe310_port_1_clk_freq,
.baud_rate = CONFIG_UART_FE310_PORT_1_BAUD_RATE,
.rxcnt_irq = CONFIG_UART_FE310_PORT_1_RXCNT_IRQ,
.txcnt_irq = CONFIG_UART_FE310_PORT_1_TXCNT_IRQ,
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.cfg_func = uart_fe310_irq_cfg_func_1,
#endif
};
DEVICE_AND_API_INIT(uart_fe310_1, CONFIG_UART_FE310_PORT_1_NAME,
uart_fe310_init,
&uart_fe310_data_1, &uart_fe310_dev_cfg_1,
PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
(void *)&uart_fe310_driver_api);
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static void uart_fe310_irq_cfg_func_1(void)
{
IRQ_CONNECT(FE310_UART_1_IRQ,
CONFIG_UART_FE310_PORT_1_IRQ_PRIORITY,
uart_fe310_irq_handler, DEVICE_GET(uart_fe310_1),
0);
irq_enable(FE310_UART_1_IRQ);
}
#endif
#endif /* CONFIG_FE310_UART_1 */
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