diff options
Diffstat (limited to 'arch/arm/mach-s3c2440/clock.c')
| -rw-r--r-- | arch/arm/mach-s3c2440/clock.c | 59 |
1 files changed, 52 insertions, 7 deletions
diff --git a/arch/arm/mach-s3c2440/clock.c b/arch/arm/mach-s3c2440/clock.c index f9e6bdaf41d..bedbc87a342 100644 --- a/arch/arm/mach-s3c2440/clock.c +++ b/arch/arm/mach-s3c2440/clock.c @@ -28,12 +28,12 @@ #include <linux/errno.h> #include <linux/err.h> #include <linux/device.h> -#include <linux/sysdev.h> #include <linux/interrupt.h> #include <linux/ioport.h> #include <linux/mutex.h> #include <linux/clk.h> #include <linux/io.h> +#include <linux/serial_core.h> #include <mach/hardware.h> #include <linux/atomic.h> @@ -43,6 +43,7 @@ #include <plat/clock.h> #include <plat/cpu.h> +#include <plat/regs-serial.h> /* S3C2440 extended clock support */ @@ -108,7 +109,47 @@ static struct clk s3c2440_clk_ac97 = { .ctrlbit = S3C2440_CLKCON_CAMERA, }; -static int s3c2440_clk_add(struct sys_device *sysdev) +static unsigned long s3c2440_fclk_n_getrate(struct clk *clk) +{ + unsigned long ucon0, ucon1, ucon2, divisor; + + /* the fun of calculating the uart divisors on the s3c2440 */ + ucon0 = __raw_readl(S3C24XX_VA_UART0 + S3C2410_UCON); + ucon1 = __raw_readl(S3C24XX_VA_UART1 + S3C2410_UCON); + ucon2 = __raw_readl(S3C24XX_VA_UART2 + S3C2410_UCON); + + ucon0 &= S3C2440_UCON0_DIVMASK; + ucon1 &= S3C2440_UCON1_DIVMASK; + ucon2 &= S3C2440_UCON2_DIVMASK; + + if (ucon0 != 0) + divisor = (ucon0 >> S3C2440_UCON_DIVSHIFT) + 6; + else if (ucon1 != 0) + divisor = (ucon1 >> S3C2440_UCON_DIVSHIFT) + 21; + else if (ucon2 != 0) + divisor = (ucon2 >> S3C2440_UCON_DIVSHIFT) + 36; + else + /* manual calims 44, seems to be 9 */ + divisor = 9; + + return clk_get_rate(clk->parent) / divisor; +} + +static struct clk s3c2440_clk_fclk_n = { + .name = "fclk_n", + .parent = &clk_f, + .ops = &(struct clk_ops) { + .get_rate = s3c2440_fclk_n_getrate, + }, +}; + +static struct clk_lookup s3c2440_clk_lookup[] = { + CLKDEV_INIT(NULL, "clk_uart_baud1", &s3c24xx_uclk), + CLKDEV_INIT(NULL, "clk_uart_baud2", &clk_p), + CLKDEV_INIT(NULL, "clk_uart_baud3", &s3c2440_clk_fclk_n), +}; + +static int s3c2440_clk_add(struct device *dev) { struct clk *clock_upll; struct clk *clock_h; @@ -126,10 +167,12 @@ static int s3c2440_clk_add(struct sys_device *sysdev) s3c2440_clk_cam.parent = clock_h; s3c2440_clk_ac97.parent = clock_p; s3c2440_clk_cam_upll.parent = clock_upll; + s3c24xx_register_clock(&s3c2440_clk_fclk_n); s3c24xx_register_clock(&s3c2440_clk_ac97); s3c24xx_register_clock(&s3c2440_clk_cam); s3c24xx_register_clock(&s3c2440_clk_cam_upll); + clkdev_add_table(s3c2440_clk_lookup, ARRAY_SIZE(s3c2440_clk_lookup)); clk_disable(&s3c2440_clk_ac97); clk_disable(&s3c2440_clk_cam); @@ -137,13 +180,15 @@ static int s3c2440_clk_add(struct sys_device *sysdev) return 0; } -static struct sysdev_driver s3c2440_clk_driver = { - .add = s3c2440_clk_add, +static struct subsys_interface s3c2440_clk_interface = { + .name = "s3c2440_clk", + .subsys = &s3c2440_subsys, + .add_dev = s3c2440_clk_add, }; -static __init int s3c24xx_clk_driver(void) +static __init int s3c24xx_clk_init(void) { - return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_clk_driver); + return subsys_interface_register(&s3c2440_clk_interface); } -arch_initcall(s3c24xx_clk_driver); +arch_initcall(s3c24xx_clk_init); |