[PATCH v5 03/11] drivers: PL011: refactor pl011_shutdown()
From: andre.przywara@arm.com (Andre Przywara)
Date: 2015-05-21 16:26:16
Also in:
linux-serial
Subsystem:
arm primecell uart pl010 and pl011 drivers, the rest, tty layer and serial drivers · Maintainers:
Russell King, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
Split the pl011_shutdown() function into smaller chunks to allow easier reuse later when adding SBSA support. Signed-off-by: Andre Przywara <andre.przywara@arm.com> --- drivers/tty/serial/amba-pl011.c | 57 +++++++++++++++++++++++------------------ 1 file changed, 32 insertions(+), 25 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 209aeb6..a43039d 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c@@ -1635,34 +1635,15 @@ static void pl011_shutdown_channel(struct uart_amba_port *uap, writew(val, uap->port.membase + lcrh); } -static void pl011_shutdown(struct uart_port *port) +/* + * disable the port. It should not disable RTS and DTR. + * Also RTS and DTR state should be preserved to restore + * it during startup(). + */ +static void pl011_disable_uart(struct uart_amba_port *uap) { - struct uart_amba_port *uap = - container_of(port, struct uart_amba_port, port); unsigned int cr; - /* - * disable all interrupts - */ - spin_lock_irq(&uap->port.lock); - uap->im = 0; - writew(uap->im, uap->port.membase + UART011_IMSC); - writew(0xffff, uap->port.membase + UART011_ICR); - spin_unlock_irq(&uap->port.lock); - - pl011_dma_shutdown(uap); - - /* - * Free the interrupt - */ - free_irq(uap->port.irq, uap); - - /* - * disable the port - * disable the port. It should not disable RTS and DTR. - * Also RTS and DTR state should be preserved to restore - * it during startup(). - */ uap->autorts = false; spin_lock_irq(&uap->port.lock); cr = readw(uap->port.membase + UART011_CR);
@@ -1678,6 +1659,32 @@ static void pl011_shutdown(struct uart_port *port) pl011_shutdown_channel(uap, uap->lcrh_rx); if (uap->lcrh_rx != uap->lcrh_tx) pl011_shutdown_channel(uap, uap->lcrh_tx); +} + +static void pl011_disable_interrupts(struct uart_amba_port *uap) +{ + spin_lock_irq(&uap->port.lock); + + /* mask all interrupts and clear all pending ones */ + uap->im = 0; + writew(uap->im, uap->port.membase + UART011_IMSC); + writew(0xffff, uap->port.membase + UART011_ICR); + + spin_unlock_irq(&uap->port.lock); +} + +static void pl011_shutdown(struct uart_port *port) +{ + struct uart_amba_port *uap = + container_of(port, struct uart_amba_port, port); + + pl011_disable_interrupts(uap); + + pl011_dma_shutdown(uap); + + free_irq(uap->port.irq, uap); + + pl011_disable_uart(uap); /* * Shut down the clock producer
--
2.3.5