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ARM: davinci: serial: provide API to initialze UART clocks

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Provide an API to initialize a UART clock. Refactor existing
davinci_serial_init() to separate out the part which enables
the clock.

This will later be used to help DA850 DT boot support.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
Sekhar Nori 2012-08-29 22:48:52 +05:30
parent b6f1ffed9d
commit 76d57ce6ef
2 changed files with 28 additions and 12 deletions
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1
arch/arm/mach-davinci/include/mach/serial.h
View file

@ -43,6 +43,7 @@ struct davinci_uart_config {
}; };
extern int davinci_serial_init(struct davinci_uart_config *); extern int davinci_serial_init(struct davinci_uart_config *);
extern int davinci_serial_setup_clk(unsigned instance, unsigned int *rate);
#endif #endif
#endif /* __ASM_ARCH_SERIAL_H */ #endif /* __ASM_ARCH_SERIAL_H */

39
arch/arm/mach-davinci/serial.c
View file

@ -70,11 +70,33 @@ static void __init davinci_serial_reset(struct plat_serial8250_port *p)
UART_DM646X_SCR_TX_WATERMARK); UART_DM646X_SCR_TX_WATERMARK);
} }
/* Enable UART clock and obtain its rate */
int __init davinci_serial_setup_clk(unsigned instance, unsigned int *rate)
{
char name[16];
struct clk *clk;
struct davinci_soc_info *soc_info = &davinci_soc_info;
struct device *dev = &soc_info->serial_dev->dev;
sprintf(name, "uart%d", instance);
clk = clk_get(dev, name);
if (IS_ERR(clk)) {
pr_err("%s:%d: failed to get UART%d clock\n",
__func__, __LINE__, instance);
return PTR_ERR(clk);
}
clk_prepare_enable(clk);
if (rate)
*rate = clk_get_rate(clk);
return 0;
}
int __init davinci_serial_init(struct davinci_uart_config *info) int __init davinci_serial_init(struct davinci_uart_config *info)
{ {
int i; int i, ret;
char name[16];
struct clk *uart_clk;
struct davinci_soc_info *soc_info = &davinci_soc_info; struct davinci_soc_info *soc_info = &davinci_soc_info;
struct device *dev = &soc_info->serial_dev->dev; struct device *dev = &soc_info->serial_dev->dev;
struct plat_serial8250_port *p = dev->platform_data; struct plat_serial8250_port *p = dev->platform_data;
@ -87,16 +109,9 @@ int __init davinci_serial_init(struct davinci_uart_config *info)
if (!(info->enabled_uarts & (1 << i))) if (!(info->enabled_uarts & (1 << i)))
continue; continue;
sprintf(name, "uart%d", i); ret = davinci_serial_setup_clk(i, &p->uartclk);
uart_clk = clk_get(dev, name); if (ret)
if (IS_ERR(uart_clk)) {
printk(KERN_ERR "%s:%d: failed to get UART%d clock\n",
__func__, __LINE__, i);
continue; continue;
}
clk_prepare_enable(uart_clk);
p->uartclk = clk_get_rate(uart_clk);
if (!p->membase && p->mapbase) { if (!p->membase && p->mapbase) {
p->membase = ioremap(p->mapbase, SZ_4K); p->membase = ioremap(p->mapbase, SZ_4K);