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Diffstat (limited to 'arch/arm/mach-s3c2440/clock.c')
-rw-r--r--arch/arm/mach-s3c2440/clock.c59
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);