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drivers: PL011: move cts_event workaround into separate function 

To avoid lines with more than 80 characters and to make the
pl011_int() function more readable, move the workaround out into a
separate function.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Tested-by: Mark Langsdorf <mlangsdo@redhat.com>
Tested-by: Naresh Bhat <nbhat@cavium.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andre Przywara 2015-05-21 17:26:20 +01:00 committed by Greg Kroah-Hartman
parent 075167ed71
commit 9c4ef4b030
1 changed files with 20 additions and 13 deletions
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33
drivers/tty/serial/amba-pl011.c
View File

@ -1317,6 +1317,25 @@ static void pl011_modem_status(struct uart_amba_port *uap)
wake_up_interruptible(&uap->port.state->port.delta_msr_wait); wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
} }
static void check_apply_cts_event_workaround(struct uart_amba_port *uap)
{
unsigned int dummy_read;
if (!uap->vendor->cts_event_workaround)
return;
/* workaround to make sure that all bits are unlocked.. */
writew(0x00, uap->port.membase + UART011_ICR);
/*
* WA: introduce 26ns(1 uart clk) delay before W1C;
* single apb access will incur 2 pclk(133.12Mhz) delay,
* so add 2 dummy reads
*/
dummy_read = readw(uap->port.membase + UART011_ICR);
dummy_read = readw(uap->port.membase + UART011_ICR);
}
static irqreturn_t pl011_int(int irq, void *dev_id) static irqreturn_t pl011_int(int irq, void *dev_id)
{ {
struct uart_amba_port *uap = dev_id; struct uart_amba_port *uap = dev_id;
@ -1324,25 +1343,13 @@ static irqreturn_t pl011_int(int irq, void *dev_id)
unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT; unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
u16 imsc; u16 imsc;
int handled = 0; int handled = 0;
unsigned int dummy_read;
spin_lock_irqsave(&uap->port.lock, flags); spin_lock_irqsave(&uap->port.lock, flags);
imsc = readw(uap->port.membase + UART011_IMSC); imsc = readw(uap->port.membase + UART011_IMSC);
status = readw(uap->port.membase + UART011_RIS) & imsc; status = readw(uap->port.membase + UART011_RIS) & imsc;
if (status) { if (status) {
do { do {
if (uap->vendor->cts_event_workaround) { check_apply_cts_event_workaround(uap);
/* workaround to make sure that all bits are unlocked.. */
writew(0x00, uap->port.membase + UART011_ICR);
/*
* WA: introduce 26ns(1 uart clk) delay before W1C;
* single apb access will incur 2 pclk(133.12Mhz) delay,
* so add 2 dummy reads
*/
dummy_read = readw(uap->port.membase + UART011_ICR);
dummy_read = readw(uap->port.membase + UART011_ICR);
}
writew(status & ~(UART011_TXIS|UART011_RTIS| writew(status & ~(UART011_TXIS|UART011_RTIS|
UART011_RXIS), UART011_RXIS),