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timbuart: Fix for tx_empty 

Hardware updated to support TX FIFO empty.

Signed-off-by: Richard Röjfors <richard.rojfors.ext@mocean-labs.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Richard Röjfors 2009-06-22 18:43:03 +01:00 коммит произвёл Linus Torvalds
Родитель be10eb7589
Коммит 2421c48bd7
1 изменённых файлов: 25 добавлений и 25 удалений
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50
drivers/serial/timbuart.c
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@ -33,29 +33,29 @@ struct timbuart_port {
struct uart_port port;
struct tasklet_struct tasklet;
int usedma;
u8 last_ier;
u32 last_ier;
struct platform_device *dev;
};
static int baudrates[] = {9600, 19200, 38400, 57600, 115200, 230400, 460800,
921600, 1843200, 3250000};
static void timbuart_mctrl_check(struct uart_port *port, u8 isr, u8 *ier);
static void timbuart_mctrl_check(struct uart_port *port, u32 isr, u32 *ier);
static irqreturn_t timbuart_handleinterrupt(int irq, void *devid);
static void timbuart_stop_rx(struct uart_port *port)
{
/* spin lock held by upper layer, disable all RX interrupts */
u8 ier = ioread8(port->membase + TIMBUART_IER) & ~RXFLAGS;
iowrite8(ier, port->membase + TIMBUART_IER);
u32 ier = ioread32(port->membase + TIMBUART_IER) & ~RXFLAGS;
iowrite32(ier, port->membase + TIMBUART_IER);
}
static void timbuart_stop_tx(struct uart_port *port)
{
/* spinlock held by upper layer, disable TX interrupt */
u8 ier = ioread8(port->membase + TIMBUART_IER) & ~TXBAE;
iowrite8(ier, port->membase + TIMBUART_IER);
u32 ier = ioread32(port->membase + TIMBUART_IER) & ~TXBAE;
iowrite32(ier, port->membase + TIMBUART_IER);
}
static void timbuart_start_tx(struct uart_port *port)
@ -72,14 +72,14 @@ static void timbuart_flush_buffer(struct uart_port *port)
u8 ctl = ioread8(port->membase + TIMBUART_CTRL) | TIMBUART_CTRL_FLSHTX;
iowrite8(ctl, port->membase + TIMBUART_CTRL);
iowrite8(TXBF, port->membase + TIMBUART_ISR);
iowrite32(TXBF, port->membase + TIMBUART_ISR);
}
static void timbuart_rx_chars(struct uart_port *port)
{
struct tty_struct *tty = port->info->port.tty;
while (ioread8(port->membase + TIMBUART_ISR) & RXDP) {
while (ioread32(port->membase + TIMBUART_ISR) & RXDP) {
u8 ch = ioread8(port->membase + TIMBUART_RXFIFO);
port->icount.rx++;
tty_insert_flip_char(tty, ch, TTY_NORMAL);
@ -97,7 +97,7 @@ static void timbuart_tx_chars(struct uart_port *port)
{
struct circ_buf *xmit = &port->info->xmit;
while (!(ioread8(port->membase + TIMBUART_ISR) & TXBF) &&
while (!(ioread32(port->membase + TIMBUART_ISR) & TXBF) &&
!uart_circ_empty(xmit)) {
iowrite8(xmit->buf[xmit->tail],
port->membase + TIMBUART_TXFIFO);
@ -114,7 +114,7 @@ static void timbuart_tx_chars(struct uart_port *port)
ioread8(port->membase + TIMBUART_BAUDRATE));
}
static void timbuart_handle_tx_port(struct uart_port *port, u8 isr, u8 *ier)
static void timbuart_handle_tx_port(struct uart_port *port, u32 isr, u32 *ier)
{
struct timbuart_port *uart =
container_of(port, struct timbuart_port, port);
@ -129,7 +129,7 @@ static void timbuart_handle_tx_port(struct uart_port *port, u8 isr, u8 *ier)
if (isr & TXFLAGS) {
timbuart_tx_chars(port);
/* clear all TX interrupts */
iowrite8(TXFLAGS, port->membase + TIMBUART_ISR);
iowrite32(TXFLAGS, port->membase + TIMBUART_ISR);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
@ -148,7 +148,7 @@ static void timbuart_handle_tx_port(struct uart_port *port, u8 isr, u8 *ier)
dev_dbg(port->dev, "%s - leaving\n", __func__);
}
void timbuart_handle_rx_port(struct uart_port *port, u8 isr, u8 *ier)
void timbuart_handle_rx_port(struct uart_port *port, u32 isr, u32 *ier)
{
if (isr & RXFLAGS) {
/* Some RX status is set */
@ -161,7 +161,7 @@ void timbuart_handle_rx_port(struct uart_port *port, u8 isr, u8 *ier)
timbuart_rx_chars(port);
/* ack all RX interrupts */
iowrite8(RXFLAGS, port->membase + TIMBUART_ISR);
iowrite32(RXFLAGS, port->membase + TIMBUART_ISR);
}
/* always have the RX interrupts enabled */
@ -173,11 +173,11 @@ void timbuart_handle_rx_port(struct uart_port *port, u8 isr, u8 *ier)
void timbuart_tasklet(unsigned long arg)
{
struct timbuart_port *uart = (struct timbuart_port *)arg;
u8 isr, ier = 0;
u32 isr, ier = 0;
spin_lock(&uart->port.lock);
isr = ioread8(uart->port.membase + TIMBUART_ISR);
isr = ioread32(uart->port.membase + TIMBUART_ISR);
dev_dbg(uart->port.dev, "%s ISR: %x\n", __func__, isr);
if (!uart->usedma)
@ -188,7 +188,7 @@ void timbuart_tasklet(unsigned long arg)
if (!uart->usedma)
timbuart_handle_rx_port(&uart->port, isr, &ier);
iowrite8(ier, uart->port.membase + TIMBUART_IER);
iowrite32(ier, uart->port.membase + TIMBUART_IER);
spin_unlock(&uart->port.lock);
dev_dbg(uart->port.dev, "%s leaving\n", __func__);
@ -196,9 +196,9 @@ void timbuart_tasklet(unsigned long arg)
static unsigned int timbuart_tx_empty(struct uart_port *port)
{
u8 isr = ioread8(port->membase + TIMBUART_ISR);
u32 isr = ioread32(port->membase + TIMBUART_ISR);
return (isr & TXBAE) ? TIOCSER_TEMT : 0;
return (isr & TXBE) ? TIOCSER_TEMT : 0;
}
static unsigned int timbuart_get_mctrl(struct uart_port *port)
@ -222,13 +222,13 @@ static void timbuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
iowrite8(TIMBUART_CTRL_RTS, port->membase + TIMBUART_CTRL);
}
static void timbuart_mctrl_check(struct uart_port *port, u8 isr, u8 *ier)
static void timbuart_mctrl_check(struct uart_port *port, u32 isr, u32 *ier)
{
unsigned int cts;
if (isr & CTS_DELTA) {
/* ack */
iowrite8(CTS_DELTA, port->membase + TIMBUART_ISR);
iowrite32(CTS_DELTA, port->membase + TIMBUART_ISR);
cts = timbuart_get_mctrl(port);
uart_handle_cts_change(port, cts & TIOCM_CTS);
wake_up_interruptible(&port->info->delta_msr_wait);
@ -255,9 +255,9 @@ static int timbuart_startup(struct uart_port *port)
dev_dbg(port->dev, "%s\n", __func__);
iowrite8(TIMBUART_CTRL_FLSHRX, port->membase + TIMBUART_CTRL);
iowrite8(0xff, port->membase + TIMBUART_ISR);
iowrite32(0x1ff, port->membase + TIMBUART_ISR);
/* Enable all but TX interrupts */
iowrite8(RXBAF | RXBF | RXTT | CTS_DELTA,
iowrite32(RXBAF | RXBF | RXTT | CTS_DELTA,
port->membase + TIMBUART_IER);
return request_irq(port->irq, timbuart_handleinterrupt, IRQF_SHARED,
@ -270,7 +270,7 @@ static void timbuart_shutdown(struct uart_port *port)
container_of(port, struct timbuart_port, port);
dev_dbg(port->dev, "%s\n", __func__);
free_irq(port->irq, uart);
iowrite8(0, port->membase + TIMBUART_IER);
iowrite32(0, port->membase + TIMBUART_IER);
}
static int get_bindex(int baud)
@ -359,10 +359,10 @@ static irqreturn_t timbuart_handleinterrupt(int irq, void *devid)
struct timbuart_port *uart = (struct timbuart_port *)devid;
if (ioread8(uart->port.membase + TIMBUART_IPR)) {
uart->last_ier = ioread8(uart->port.membase + TIMBUART_IER);
uart->last_ier = ioread32(uart->port.membase + TIMBUART_IER);
/* disable interrupts, the tasklet enables them again */
iowrite8(0, uart->port.membase + TIMBUART_IER);
iowrite32(0, uart->port.membase + TIMBUART_IER);
/* fire off bottom half */
tasklet_schedule(&uart->tasklet);