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[ARM] 4795/1: S3C244X: Add armclk and setparent call 

Add armclk to the supported clocks on the S3C2440 and S3C2442 to
better represent the DVS state which controls whether FCLK or HCLK
is fed to the ARM core.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ben Dooks 2008-01-28 13:01:35 +01:00 committed by Russell King
parent 3a38e4be76
commit 06dbbd69f9
1 changed files with 37 additions and 0 deletions
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37
arch/arm/plat-s3c24xx/s3c244x-clock.c
View File

@ -44,15 +44,52 @@
#include <asm/plat-s3c24xx/clock.h>
#include <asm/plat-s3c24xx/cpu.h>
static int s3c2440_setparent_armclk(struct clk *clk, struct clk *parent)
{
unsigned long camdivn;
unsigned long dvs;
if (parent == &clk_f)
dvs = 0;
else if (parent == &clk_h)
dvs = S3C2440_CAMDIVN_DVSEN;
else
return -EINVAL;
clk->parent = parent;
camdivn = __raw_readl(S3C2440_CAMDIVN);
camdivn &= ~S3C2440_CAMDIVN_DVSEN;
camdivn |= dvs;
__raw_writel(camdivn, S3C2440_CAMDIVN);
return 0;
}
static struct clk clk_arm = {
.name = "armclk",
.id = -1,
.set_parent = s3c2440_setparent_armclk,
};
static int s3c244x_clk_add(struct sys_device *sysdev)
{
unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
unsigned long clkdivn;
struct clk *clock_upll;
int ret;
printk("S3C244X: Clock Support, DVS %s\n",
(camdivn & S3C2440_CAMDIVN_DVSEN) ? "on" : "off");
clk_arm.parent = (camdivn & S3C2440_CAMDIVN_DVSEN) ? &clk_h : &clk_f;
ret = s3c24xx_register_clock(&clk_arm);
if (ret < 0) {
printk(KERN_ERR "S3C24XX: Failed to add armclk (%d)\n", ret);
return ret;
}
clock_upll = clk_get(NULL, "upll");
if (IS_ERR(clock_upll)) {
printk(KERN_ERR "S3C244X: Failed to get upll clock\n");