/**
* @brief closes sci peripheral of interrupt driven driver
*
* calls tms570_sci_poll_last_close and disables interrupts
*
* @param[in] tty Termios control
* @param[in] base context of the driver
* @param[in] args
* @retval false Error occured during initialization
* @retval true Driver is open and ready
*/
static void tms570_sci_interrupt_last_close(
rtems_termios_tty *tty,
rtems_termios_device_context *base,
rtems_libio_open_close_args_t *args
)
{
tms570_sci_context *ctx = (tms570_sci_context *) base;
rtems_interrupt_lock_context lock_context;
rtems_interval tw;
int32_t baudrate;
/* Turn off RX interrupts */
rtems_termios_device_lock_acquire(base, &lock_context);
tms570_sci_disable_interrupts(ctx);
rtems_termios_device_lock_release(base, &lock_context);
tw = rtems_clock_get_ticks_per_second();
baudrate = rtems_termios_baud_to_number(cfgetospeed(&tty->termios));
tw = tw * 10 / baudrate + 1;
while ( ( ctx->regs->FLR & TMS570_SCI_FLR_TX_EMPTY ) == 0 ) {
rtems_task_wake_after(tw);
}
/* uninstall ISR */
rtems_interrupt_handler_remove(ctx->irq, tms570_sci_interrupt_handler, tty);
tms570_sci_poll_last_close(tty, base, args);
}
/* Handle UART interrupts */
static void apbuart_cons_isr(void *arg)
{
rtems_termios_tty *tty = arg;
rtems_termios_device_context *base;
struct console_dev *condev = rtems_termios_get_device_context(tty);
struct apbuart_priv *uart = condev_get_priv(condev);
struct apbuart_regs *regs = uart->regs;
unsigned int status;
char buf[33];
int cnt;
if (uart->mode == TERMIOS_TASK_DRIVEN) {
if ((status = regs->status) & APBUART_STATUS_DR) {
rtems_interrupt_lock_context lock_context;
/* Turn off RX interrupts */
base = rtems_termios_get_device_context(tty);
rtems_termios_device_lock_acquire(base, &lock_context);
regs->ctrl &=
~(APBUART_CTRL_DI | APBUART_CTRL_RI |
APBUART_CTRL_RF);
rtems_termios_device_lock_release(base, &lock_context);
/* Activate termios RX daemon task */
rtems_termios_rxirq_occured(tty);
}
} else {
/*
* Get all new characters from APBUART RX (FIFO) and store them
* on the stack. Then tell termios about the new characters.
* Maximum APBUART RX FIFO size is 32 characters.
*/
cnt = 0;
while (
((status=regs->status) & APBUART_STATUS_DR) &&
(cnt < sizeof(buf))
) {
buf[cnt] = regs->data;
cnt++;
}
if (0 < cnt) {
/* Tell termios layer about new characters */
rtems_termios_enqueue_raw_characters(tty, &buf[0], cnt);
}
}
if (uart->sending && (status & APBUART_STATUS_TE)) {
/* Tell close that we sent everything */
cnt = uart->sending;
/*
* Tell termios how much we have sent. dequeue() may call
* write_interrupt() to refill the transmitter.
* write_interrupt() will eventually be called with 0 len to
* disable TX interrupts.
*/
rtems_termios_dequeue_characters(tty, cnt);
}
}
/**
* @brief Set attributes of the HW peripheral
*
* Sets attributes of the HW peripheral (parity, baud rate, etc.)
*
* @param[in] base context of the driver
* @param[in] t termios driver
* @retval true peripheral setting is changed
*/
static bool tms570_sci_set_attributes(
rtems_termios_device_context *base,
const struct termios *t
)
{
tms570_sci_context *ctx = (tms570_sci_context *) base;
rtems_interrupt_lock_context lock_context;
int32_t bauddiv;
int32_t baudrate;
rtems_termios_device_lock_acquire(base, &lock_context);
ctx->regs->GCR1 &= ~( TMS570_SCI_GCR1_SWnRST | TMS570_SCI_GCR1_TXENA |
TMS570_SCI_GCR1_RXENA );
ctx->regs->GCR1 &= ~TMS570_SCI_GCR1_STOP; /*one stop bit*/
ctx->regs->FORMAT = TMS570_SCI_FORMAT_CHAR(0x7);
switch ( t->c_cflag & ( PARENB|PARODD ) ) {
case ( PARENB|PARODD ):
/* Odd parity */
ctx->regs->GCR1 &= ~TMS570_SCI_GCR1_PARITY;
ctx->regs->GCR1 |= TMS570_SCI_GCR1_PARITY_ENA;
break;
case PARENB:
/* Even parity */
ctx->regs->GCR1 |= TMS570_SCI_GCR1_PARITY;
ctx->regs->GCR1 |= TMS570_SCI_GCR1_PARITY_ENA;
break;
default:
case 0:
case PARODD:
/* No Parity */
ctx->regs->GCR1 &= ~TMS570_SCI_GCR1_PARITY_ENA;
}
/* Baud rate */
baudrate = rtems_termios_baud_to_number(cfgetospeed(t));
baudrate *= 2 * 16;
bauddiv = (BSP_PLL_OUT_CLOCK + baudrate / 2) / baudrate;
ctx->regs->BRS = bauddiv;
ctx->regs->GCR1 |= TMS570_SCI_GCR1_SWnRST | TMS570_SCI_GCR1_TXENA |
TMS570_SCI_GCR1_RXENA;
rtems_termios_device_lock_release(base, &lock_context);
return true;
}
/**
* @brief Set attributes of the HW peripheral
*
* Sets attributes of the HW peripheral (parity, baud rate, etc.)
*
* @param[in] base context of the driver
* @param[in] t termios driver
* @retval true peripheral setting is changed
*/
static bool tms570_sci_set_attributes(
rtems_termios_device_context *base,
const struct termios *t
)
{
tms570_sci_context *ctx = (tms570_sci_context *) base;
rtems_interrupt_lock_context lock_context;
int32_t bauddiv;
int32_t baudrate;
rtems_termios_device_lock_acquire(base, &lock_context);
ctx->regs->SCIGCR1 &= ~( (1<<7) | (1<<25) | (1<<24) );
ctx->regs->SCIGCR1 &= ~(1<<4); /*one stop bit*/
ctx->regs->SCIFORMAT = 0x7;
switch ( t->c_cflag & ( PARENB|PARODD ) ) {
case ( PARENB|PARODD ):
/* Odd parity */
ctx->regs->SCIGCR1 &= ~(1<<3);
ctx->regs->SCIGCR1 |= (1<<2);
break;
case PARENB:
/* Even parity */
ctx->regs->SCIGCR1 |= (1<<3);
ctx->regs->SCIGCR1 |= (1<<2);
break;
default:
case 0:
case PARODD:
/* No Parity */
ctx->regs->SCIGCR1 &= ~(1<<2);
}
/* Baud rate */
baudrate = rtems_termios_baud_to_number(cfgetospeed(t));
baudrate *= 2 * 16;
bauddiv = (BSP_PLL_OUT_CLOCK + baudrate / 2) / baudrate;
ctx->regs->BRS = bauddiv;
ctx->regs->SCIGCR1 |= (1<<7) | (1<<25) | (1<<24);
rtems_termios_device_lock_release(base, &lock_context);
return true;
}
/* This function is called from TERMIOS rxdaemon task without device lock. */
static int read_task(rtems_termios_device_context *base)
{
rtems_interrupt_lock_context lock_context;
struct apbuart_priv *uart = base_get_priv(base);
struct apbuart_regs *regs = uart->regs;
int cnt;
char buf[33];
struct rtems_termios_tty *tty;
uint32_t ctrl_add;
ctrl_add = APBUART_CTRL_RI;
if (uart->cap & CAP_DI) {
ctrl_add |= (APBUART_CTRL_DI | APBUART_CTRL_RF);
}
tty = uart->tty;
do {
cnt = 0;
while (
(regs->status & APBUART_STATUS_DR) &&
(cnt < sizeof(buf))
) {
buf[cnt] = regs->data;
cnt++;
}
if (0 < cnt) {
/* Tell termios layer about new characters */
rtems_termios_enqueue_raw_characters(tty, &buf[0], cnt);
}
/*
* Turn on RX interrupts. A new character in FIFO now may not
* cause interrupt so we must check data ready again
* afterwards.
*/
rtems_termios_device_lock_acquire(base, &lock_context);
regs->ctrl |= ctrl_add;
rtems_termios_device_lock_release(base, &lock_context);
} while (regs->status & APBUART_STATUS_DR);
return EOF;
}
static void apbuart_last_close_interrupt(
rtems_termios_tty *tty,
rtems_termios_device_context *base,
rtems_libio_open_close_args_t *args
)
{
struct apbuart_context *uart = (struct apbuart_context *) base;
rtems_interrupt_lock_context lock_context;
/* Turn off RX interrupts */
rtems_termios_device_lock_acquire(base, &lock_context);
uart->regs->ctrl &= ~(APBUART_CTRL_RI);
rtems_termios_device_lock_release(base, &lock_context);
/**** Flush device ****/
while (uart->sending) {
/* Wait until all data has been sent */
}
/* uninstall ISR */
rtems_interrupt_handler_remove(uart->irq, apbuart_isr, tty);
}
static void last_close(
rtems_termios_tty *tty,
rtems_termios_device_context *base,
rtems_libio_open_close_args_t *args
)
{
struct apbuart_priv *uart = base_get_priv(base);
rtems_interrupt_lock_context lock_context;
if (uart->mode != TERMIOS_POLLED) {
/* Turn off RX interrupts */
rtems_termios_device_lock_acquire(base, &lock_context);
uart->regs->ctrl &=
~(APBUART_CTRL_DI | APBUART_CTRL_RI | APBUART_CTRL_RF);
rtems_termios_device_lock_release(base, &lock_context);
/**** Flush device ****/
while (uart->sending) {
/* Wait until all data has been sent */
}
while (
(uart->regs->ctrl & APBUART_CTRL_TE) &&
!(uart->regs->status & APBUART_STATUS_TS)
) {
/* Wait until all data has left shift register */
}
/* Disable and unregister interrupt handler */
drvmgr_interrupt_unregister(uart->dev, 0, apbuart_cons_isr, tty);
}
#ifdef LEON3
/* Disable TX/RX if not used for DEBUG */
if (uart->regs != leon3_debug_uart)
uart->regs->ctrl &= ~(APBUART_CTRL_RE | APBUART_CTRL_TE);
#endif
}
/**
* @brief closes sci peripheral of interrupt driven driver
*
* calls tms570_sci_poll_last_close and disables interrupts
*
* @param[in] tty Termios control
* @param[in] base context of the driver
* @param[in] args
* @retval false Error occured during initialization
* @retval true Driver is open and ready
*/
static void tms570_sci_interrupt_last_close(
rtems_termios_tty *tty,
rtems_termios_device_context *base,
rtems_libio_open_close_args_t *args
)
{
tms570_sci_context *ctx = (tms570_sci_context *) base;
rtems_interrupt_lock_context lock_context;
/* Turn off RX interrupts */
rtems_termios_device_lock_acquire(base, &lock_context);
tms570_sci_disable_interrupts(ctx);
rtems_termios_device_lock_release(base, &lock_context);
/* Flush device */
while ( ( ctx->regs->FLR & TMS570_SCI_FLR_TX_EMPTY ) > 0 ) {
;/* Wait until all data has been sent */
}
/* uninstall ISR */
rtems_interrupt_handler_remove(ctx->irq, tms570_sci_interrupt_handler, tty);
tms570_sci_poll_last_close(tty, base, args);
}
static bool apbuart_set_attributes(
rtems_termios_device_context *base,
const struct termios *t
)
{
struct apbuart_context *uart = (struct apbuart_context *) base;
rtems_interrupt_lock_context lock_context;
unsigned int scaler;
unsigned int ctrl;
int baud;
switch (t->c_cflag & CSIZE) {
default:
case CS5:
case CS6:
case CS7:
/* Hardware doesn't support other than CS8 */
return false;
case CS8:
break;
}
rtems_termios_device_lock_acquire(base, &lock_context);
/* Read out current value */
ctrl = uart->regs->ctrl;
switch (t->c_cflag & (PARENB|PARODD)) {
case (PARENB|PARODD):
/* Odd parity */
ctrl |= APBUART_CTRL_PE|APBUART_CTRL_PS;
break;
case PARENB:
/* Even parity */
ctrl &= ~APBUART_CTRL_PS;
ctrl |= APBUART_CTRL_PE;
break;
default:
case 0:
case PARODD:
/* No Parity */
ctrl &= ~(APBUART_CTRL_PS|APBUART_CTRL_PE);
}
if (!(t->c_cflag & CLOCAL)) {
ctrl |= APBUART_CTRL_FL;
} else {
ctrl &= ~APBUART_CTRL_FL;
}
/* Update new settings */
uart->regs->ctrl = ctrl;
rtems_termios_device_lock_release(base, &lock_context);
/* Baud rate */
baud = rtems_termios_baud_to_number(t->c_cflag);
if (baud > 0) {
/* Calculate Baud rate generator "scaler" number */
scaler = (((uart->freq_hz * 10) / (baud * 8)) - 5) / 10;
/* Set new baud rate by setting scaler */
uart->regs->scaler = scaler;
}
return true;
}
static bool set_attributes(
rtems_termios_device_context *base,
const struct termios *t
)
{
unsigned int core_clk_hz;
unsigned int scaler;
unsigned int ctrl;
int baud;
struct apbuart_priv *uart = base_get_priv(base);
rtems_interrupt_lock_context lock_context;
switch(t->c_cflag & CSIZE) {
default:
case CS5:
case CS6:
case CS7:
/* Hardware doesn't support other than CS8 */
return false;
case CS8:
break;
}
rtems_termios_device_lock_acquire(base, &lock_context);
/* Read out current value */
ctrl = uart->regs->ctrl;
switch(t->c_cflag & (PARENB|PARODD)){
case (PARENB|PARODD):
/* Odd parity */
ctrl |= LEON_REG_UART_CTRL_PE|LEON_REG_UART_CTRL_PS;
break;
case PARENB:
/* Even parity */
ctrl &= ~LEON_REG_UART_CTRL_PS;
ctrl |= LEON_REG_UART_CTRL_PE;
break;
default:
case 0:
case PARODD:
/* No Parity */
ctrl &= ~(LEON_REG_UART_CTRL_PS|LEON_REG_UART_CTRL_PE);
}
if (!(t->c_cflag & CLOCAL))
ctrl |= LEON_REG_UART_CTRL_FL;
else
ctrl &= ~LEON_REG_UART_CTRL_FL;
/* Update new settings */
uart->regs->ctrl = ctrl;
rtems_termios_device_lock_release(base, &lock_context);
/* Baud rate */
baud = apbuart_baud_num2baud(t->c_ospeed);
if (baud > 0){
/* Get APBUART core frequency */
drvmgr_freq_get(uart->dev, DEV_APB_SLV, &core_clk_hz);
/* Calculate Baud rate generator "scaler" number */
scaler = (((core_clk_hz*10)/(baud*8))-5)/10;
/* Set new baud rate by setting scaler */
uart->regs->scaler = scaler;
}
return true;
}
/**
* @brief Set attributes of the HW peripheral
*
* Sets attributes of the HW peripheral (parity, baud rate, etc.)
*
* @param[in] base context of the driver
* @param[in] t termios driver
* @retval true peripheral setting is changed
*/
bool tms570_sci_set_attributes(
rtems_termios_device_context *base,
const struct termios *t
)
{
tms570_sci_context *ctx = (tms570_sci_context *) base;
rtems_interrupt_lock_context lock_context;
int32_t bauddiv;
int32_t baudrate;
uint32_t flr_tx_ready = TMS570_SCI_FLR_TX_EMPTY;
/*
* Test for TMS570_SCI_FLR_TXRDY is not necessary
* because both SCITD and SCITXSHF has to be empty
* to TX_EMPTY be asserted. But there is no interrupt
* option for TX_EMPTY. Polling is used isntead.
*/
/* Baud rate */
baudrate = rtems_termios_baud_to_number(cfgetospeed(t));
rtems_termios_device_lock_acquire(base, &lock_context);
while ( (ctx->regs->GCR1 & TMS570_SCI_GCR1_TXENA) &&
(ctx->regs->FLR & flr_tx_ready) != flr_tx_ready) {
/*
* There are pending characters in the hardware,
* change in the middle of the character Tx leads
* to disturb of the character and SCI engine
*/
rtems_interval tw;
rtems_termios_device_lock_release(base, &lock_context);
tw = rtems_clock_get_ticks_per_second();
tw = tw * 5 / baudrate + 1;
rtems_task_wake_after( tw );
rtems_termios_device_lock_acquire(base, &lock_context);
}
ctx->regs->GCR1 &= ~( TMS570_SCI_GCR1_SWnRST | TMS570_SCI_GCR1_TXENA |
TMS570_SCI_GCR1_RXENA );
ctx->regs->GCR1 &= ~TMS570_SCI_GCR1_STOP; /*one stop bit*/
ctx->regs->FORMAT = TMS570_SCI_FORMAT_CHAR(0x7);
switch ( t->c_cflag & ( PARENB|PARODD ) ) {
case ( PARENB|PARODD ):
/* Odd parity */
ctx->regs->GCR1 &= ~TMS570_SCI_GCR1_PARITY;
ctx->regs->GCR1 |= TMS570_SCI_GCR1_PARITY_ENA;
break;
case PARENB:
/* Even parity */
ctx->regs->GCR1 |= TMS570_SCI_GCR1_PARITY;
ctx->regs->GCR1 |= TMS570_SCI_GCR1_PARITY_ENA;
break;
default:
case 0:
case PARODD:
/* No Parity */
ctx->regs->GCR1 &= ~TMS570_SCI_GCR1_PARITY_ENA;
}
/* Apply baudrate to the hardware */
baudrate *= 2 * 16;
bauddiv = (BSP_PLL_OUT_CLOCK + baudrate / 2) / baudrate;
ctx->regs->BRS = bauddiv? bauddiv - 1: 0;
ctx->regs->GCR1 |= TMS570_SCI_GCR1_SWnRST | TMS570_SCI_GCR1_TXENA |
TMS570_SCI_GCR1_RXENA;
rtems_termios_device_lock_release(base, &lock_context);
return true;
}