diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/serial/pxa.c | 28 |
1 files changed, 23 insertions, 5 deletions
diff --git a/drivers/serial/pxa.c b/drivers/serial/pxa.c index 59889f6a86b..af3a011b2b2 100644 --- a/drivers/serial/pxa.c +++ b/drivers/serial/pxa.c @@ -42,6 +42,7 @@ #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/serial_core.h> +#include <linux/clk.h> #include <asm/io.h> #include <asm/hardware.h> @@ -55,7 +56,7 @@ struct uart_pxa_port { unsigned char lcr; unsigned char mcr; unsigned int lsr_break_flag; - unsigned int cken; + struct clk *clk; char *name; }; @@ -351,6 +352,8 @@ static int serial_pxa_startup(struct uart_port *port) else up->mcr = 0; + up->port.uartclk = clk_get_rate(up->clk); + /* * Allocate the IRQ */ @@ -546,9 +549,11 @@ serial_pxa_pm(struct uart_port *port, unsigned int state, unsigned int oldstate) { struct uart_pxa_port *up = (struct uart_pxa_port *)port; - pxa_set_cken(up->cken, !state); + if (!state) - udelay(1); + clk_enable(up->clk); + else + clk_disable(up->clk); } static void serial_pxa_release_port(struct uart_port *port) @@ -635,6 +640,8 @@ serial_pxa_console_write(struct console *co, const char *s, unsigned int count) struct uart_pxa_port *up = serial_pxa_ports[co->index]; unsigned int ier; + clk_enable(up->clk); + /* * First save the IER then disable the interrupts */ @@ -649,6 +656,8 @@ serial_pxa_console_write(struct console *co, const char *s, unsigned int count) */ wait_for_xmitr(up); serial_out(up, UART_IER, ier); + + clk_disable(up->clk); } static int __init @@ -752,6 +761,12 @@ static int serial_pxa_probe(struct platform_device *dev) if (!sport) return -ENOMEM; + sport->clk = clk_get(&dev->dev, "UARTCLK"); + if (IS_ERR(sport->clk)) { + ret = PTR_ERR(sport->clk); + goto err_free; + } + sport->port.type = PORT_PXA; sport->port.iotype = UPIO_MEM; sport->port.mapbase = mmres->start; @@ -761,7 +776,7 @@ static int serial_pxa_probe(struct platform_device *dev) sport->port.line = dev->id; sport->port.dev = &dev->dev; sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF; - sport->port.uartclk = 921600 * 16; + sport->port.uartclk = clk_get_rate(sport->clk); /* * Is it worth keeping this? @@ -780,7 +795,7 @@ static int serial_pxa_probe(struct platform_device *dev) sport->port.membase = ioremap(mmres->start, mmres->end - mmres->start + 1); if (!sport->port.membase) { ret = -ENOMEM; - goto err_free; + goto err_clk; } serial_pxa_ports[dev->id] = sport; @@ -790,6 +805,8 @@ static int serial_pxa_probe(struct platform_device *dev) return 0; + err_clk: + clk_put(sport->clk); err_free: kfree(sport); return ret; @@ -802,6 +819,7 @@ static int serial_pxa_remove(struct platform_device *dev) platform_set_drvdata(dev, NULL); uart_remove_one_port(&serial_pxa_reg, &sport->port); + clk_put(sport->clk); kfree(sport); return 0; |