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Diffstat (limited to 'arch/arm/mach-s3c2410/clock.c')
-rw-r--r--arch/arm/mach-s3c2410/clock.c38
1 files changed, 37 insertions, 1 deletions
diff --git a/arch/arm/mach-s3c2410/clock.c b/arch/arm/mach-s3c2410/clock.c
index 08489efdaf0..aaada9e3d67 100644
--- a/arch/arm/mach-s3c2410/clock.c
+++ b/arch/arm/mach-s3c2410/clock.c
@@ -38,6 +38,7 @@
#include <linux/ioport.h>
#include <linux/clk.h>
#include <linux/mutex.h>
+#include <linux/delay.h>
#include <asm/hardware.h>
#include <asm/irq.h>
@@ -200,6 +201,28 @@ EXPORT_SYMBOL(clk_round_rate);
EXPORT_SYMBOL(clk_set_rate);
EXPORT_SYMBOL(clk_get_parent);
+/* base clock enable */
+
+static int s3c24xx_upll_enable(struct clk *clk, int enable)
+{
+ unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW);
+ unsigned long orig = clkslow;
+
+ if (enable)
+ clkslow &= ~S3C2410_CLKSLOW_UCLK_OFF;
+ else
+ clkslow |= S3C2410_CLKSLOW_UCLK_OFF;
+
+ __raw_writel(clkslow, S3C2410_CLKSLOW);
+
+ /* if we started the UPLL, then allow to settle */
+
+ if (enable && !(orig & S3C2410_CLKSLOW_UCLK_OFF))
+ udelay(200);
+
+ return 0;
+}
+
/* base clocks */
static struct clk clk_xtal = {
@@ -210,6 +233,14 @@ static struct clk clk_xtal = {
.ctrlbit = 0,
};
+static struct clk clk_upll = {
+ .name = "upll",
+ .id = -1,
+ .parent = NULL,
+ .enable = s3c24xx_upll_enable,
+ .ctrlbit = 0,
+};
+
static struct clk clk_f = {
.name = "fclk",
.id = -1,
@@ -262,7 +293,7 @@ struct clk s3c24xx_uclk = {
};
-/* clock definitions */
+/* standard clock definitions */
static struct clk init_clocks[] = {
{
@@ -396,6 +427,7 @@ int __init s3c24xx_setup_clocks(unsigned long xtal,
unsigned long hclk,
unsigned long pclk)
{
+ unsigned long upllcon = __raw_readl(S3C2410_UPLLCON);
unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW);
struct clk *clkp = init_clocks;
int ptr;
@@ -406,6 +438,7 @@ int __init s3c24xx_setup_clocks(unsigned long xtal,
/* initialise the main system clocks */
clk_xtal.rate = xtal;
+ clk_upll.rate = s3c2410_get_pll(upllcon, xtal);
clk_h.rate = hclk;
clk_p.rate = pclk;
@@ -439,6 +472,9 @@ int __init s3c24xx_setup_clocks(unsigned long xtal,
if (s3c24xx_register_clock(&clk_xtal) < 0)
printk(KERN_ERR "failed to register master xtal\n");
+ if (s3c24xx_register_clock(&clk_upll) < 0)
+ printk(KERN_ERR "failed to register upll clock\n");
+
if (s3c24xx_register_clock(&clk_f) < 0)
printk(KERN_ERR "failed to register cpu fclk\n");