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drivers: PL011: refactor pl011_startup()

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Split the pl011_startup() function into smaller chunks to allow
easier reuse later when adding SBSA support.

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 17:26:15 +01:00 committed by Greg Kroah-Hartman
parent 49bb3c862c
commit 867b8e8e89
1 changed files with 28 additions and 20 deletions
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48
drivers/tty/serial/amba-pl011.c
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@ -1556,6 +1556,32 @@ static void pl011_write_lcr_h(struct uart_amba_port *uap, unsigned int lcr_h)
}
}
static int pl011_allocate_irq(struct uart_amba_port *uap)
{
writew(uap->im, uap->port.membase + UART011_IMSC);
return request_irq(uap->port.irq, pl011_int, 0, "uart-pl011", uap);
}
/*
* Enable interrupts, only timeouts when using DMA
* if initial RX DMA job failed, start in interrupt mode
* as well.
*/
static void pl011_enable_interrupts(struct uart_amba_port *uap)
{
spin_lock_irq(&uap->port.lock);
/* Clear out any spuriously appearing RX interrupts */
writew(UART011_RTIS | UART011_RXIS,
uap->port.membase + UART011_ICR);
uap->im = UART011_RTIM;
if (!pl011_dma_rx_running(uap))
uap->im |= UART011_RXIM;
writew(uap->im, uap->port.membase + UART011_IMSC);
spin_unlock_irq(&uap->port.lock);
}
static int pl011_startup(struct uart_port *port)
{
struct uart_amba_port *uap =
@ -1567,12 +1593,7 @@ static int pl011_startup(struct uart_port *port)
if (retval)
goto clk_dis;
writew(uap->im, uap->port.membase + UART011_IMSC);
/*
* Allocate the IRQ
*/
retval = request_irq(uap->port.irq, pl011_int, 0, "uart-pl011", uap);
retval = pl011_allocate_irq(uap);
if (retval)
goto clk_dis;
@ -1595,20 +1616,7 @@ static int pl011_startup(struct uart_port *port)
/* Startup DMA */
pl011_dma_startup(uap);
/*
* Finally, enable interrupts, only timeouts when using DMA
* if initial RX DMA job failed, start in interrupt mode
* as well.
*/
spin_lock_irq(&uap->port.lock);
/* Clear out any spuriously appearing RX interrupts */
writew(UART011_RTIS | UART011_RXIS,
uap->port.membase + UART011_ICR);
uap->im = UART011_RTIM;
if (!pl011_dma_rx_running(uap))
uap->im |= UART011_RXIM;
writew(uap->im, uap->port.membase + UART011_IMSC);
spin_unlock_irq(&uap->port.lock);
pl011_enable_interrupts(uap);
return 0;