Commit 5ede4a5c authored by Soren Brinkmann's avatar Soren Brinkmann Committed by Greg Kroah-Hartman

tty: xuartps: Move RX path into helper function

Move RX-related IRQ handling into a helper function.
Fixes a problem where every char received after a parity or frame error
in the current isr will also be tagged as a parity or frame error.
Signed-off-by: default avatarSoren Brinkmann <soren.brinkmann@xilinx.com>
Reviewed-by: default avatarPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a19eda0f
...@@ -172,28 +172,8 @@ struct cdns_uart { ...@@ -172,28 +172,8 @@ struct cdns_uart {
#define to_cdns_uart(_nb) container_of(_nb, struct cdns_uart, \ #define to_cdns_uart(_nb) container_of(_nb, struct cdns_uart, \
clk_rate_change_nb); clk_rate_change_nb);
/** static void cdns_uart_handle_rx(struct uart_port *port, unsigned int isrstatus)
* cdns_uart_isr - Interrupt handler
* @irq: Irq number
* @dev_id: Id of the port
*
* Return: IRQHANDLED
*/
static irqreturn_t cdns_uart_isr(int irq, void *dev_id)
{ {
struct uart_port *port = (struct uart_port *)dev_id;
unsigned long flags;
unsigned int isrstatus, numbytes;
unsigned int data;
char status = TTY_NORMAL;
spin_lock_irqsave(&port->lock, flags);
/* Read the interrupt status register to determine which
* interrupt(s) is/are active.
*/
isrstatus = readl(port->membase + CDNS_UART_ISR_OFFSET);
/* /*
* There is no hardware break detection, so we interpret framing * There is no hardware break detection, so we interpret framing
* error with all-zeros data as a break sequence. Most of the time, * error with all-zeros data as a break sequence. Most of the time,
...@@ -223,6 +203,9 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id) ...@@ -223,6 +203,9 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id)
/* Receive Timeout Interrupt */ /* Receive Timeout Interrupt */
while (!(readl(port->membase + CDNS_UART_SR_OFFSET) & while (!(readl(port->membase + CDNS_UART_SR_OFFSET) &
CDNS_UART_SR_RXEMPTY)) { CDNS_UART_SR_RXEMPTY)) {
u32 data;
char status = TTY_NORMAL;
data = readl(port->membase + CDNS_UART_FIFO_OFFSET); data = readl(port->membase + CDNS_UART_FIFO_OFFSET);
/* Non-NULL byte after BREAK is garbage (99%) */ /* Non-NULL byte after BREAK is garbage (99%) */
...@@ -263,10 +246,33 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id) ...@@ -263,10 +246,33 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id)
} }
uart_insert_char(port, isrstatus, CDNS_UART_IXR_OVERRUN, uart_insert_char(port, isrstatus, CDNS_UART_IXR_OVERRUN,
data, status); data, status);
} }
tty_flip_buffer_push(&port->state->port); tty_flip_buffer_push(&port->state->port);
} }
}
/**
* cdns_uart_isr - Interrupt handler
* @irq: Irq number
* @dev_id: Id of the port
*
* Return: IRQHANDLED
*/
static irqreturn_t cdns_uart_isr(int irq, void *dev_id)
{
struct uart_port *port = (struct uart_port *)dev_id;
unsigned long flags;
unsigned int isrstatus, numbytes;
spin_lock_irqsave(&port->lock, flags);
/* Read the interrupt status register to determine which
* interrupt(s) is/are active.
*/
isrstatus = readl(port->membase + CDNS_UART_ISR_OFFSET);
cdns_uart_handle_rx(port, isrstatus);
/* Dispatch an appropriate handler */ /* Dispatch an appropriate handler */
if ((isrstatus & CDNS_UART_IXR_TXEMPTY) == CDNS_UART_IXR_TXEMPTY) { if ((isrstatus & CDNS_UART_IXR_TXEMPTY) == CDNS_UART_IXR_TXEMPTY) {
......
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