Commit 36c64af4 authored by Ben Dooks's avatar Ben Dooks Committed by Russell King

[ARM] 3361/1: S3C24XX - add USB bus clock source

Patch from Ben Dooks

Add USB bus clock definition for 48MHz fed to OHCI and gadget cores
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent e44c0396
......@@ -53,7 +53,8 @@
/* clock information */
static LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);
DEFINE_MUTEX(clocks_mutex);
/* old functions */
......@@ -296,6 +297,13 @@ static struct clk clk_p = {
.ctrlbit = 0,
};
struct clk clk_usb_bus = {
.name = "usb-bus",
.id = -1,
.rate = 0,
.parent = &clk_upll,
};
/* clocks that could be registered by external code */
static int s3c24xx_dclk_enable(struct clk *clk, int enable)
......@@ -606,6 +614,10 @@ int __init s3c24xx_setup_clocks(unsigned long xtal,
if (s3c24xx_register_clock(&clk_p) < 0)
printk(KERN_ERR "failed to register cpu pclk\n");
if (s3c24xx_register_clock(&clk_usb_bus) < 0)
printk(KERN_ERR "failed to register usb bus clock\n");
/* register clocks from clock array */
for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) {
......
......@@ -34,11 +34,15 @@ extern struct clk s3c24xx_clkout0;
extern struct clk s3c24xx_clkout1;
extern struct clk s3c24xx_uclk;
extern struct clk clk_usb_bus;
/* exports for arch/arm/mach-s3c2410
*
* Please DO NOT use these outside of arch/arm/mach-s3c2410
*/
extern struct mutex clocks_mutex;
extern int s3c24xx_clkcon_enable(struct clk *clk, int enable);
extern int s3c24xx_register_clock(struct clk *clk);
......
......@@ -31,6 +31,7 @@
#include <linux/sysdev.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <asm/hardware.h>
......@@ -111,20 +112,38 @@ static struct clk s3c2440_clk_ac97 = {
static int s3c2440_clk_add(struct sys_device *sysdev)
{
unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
unsigned long clkdivn;
struct clk *clk_h;
struct clk *clk_p;
struct clk *clk_upll;
printk("S3C2440: Clock Support, DVS %s\n",
(camdivn & S3C2440_CAMDIVN_DVSEN) ? "on" : "off");
clk_p = clk_get(NULL, "pclk");
clk_h = clk_get(NULL, "hclk");
clk_upll = clk_get(NULL, "upll");
if (IS_ERR(clk_p) || IS_ERR(clk_h)) {
if (IS_ERR(clk_p) || IS_ERR(clk_h) || IS_ERR(clk_upll)) {
printk(KERN_ERR "S3C2440: Failed to get parent clocks\n");
return -EINVAL;
}
/* check rate of UPLL, and if it is near 96MHz, then change
* to using half the UPLL rate for the system */
if (clk_get_rate(clk_upll) > (94 * MHZ)) {
clk_usb_bus.rate = clk_get_rate(clk_upll) / 2;
mutex_lock(&clocks_mutex);
clkdivn = __raw_readl(S3C2410_CLKDIVN);
clkdivn |= S3C2440_CLKDIVN_UCLK;
__raw_writel(camdivn, S3C2410_CLKDIVN);
mutex_unlock(&clocks_mutex);
}
s3c2440_clk_cam.parent = clk_h;
s3c2440_clk_ac97.parent = clk_p;
s3c2440_clk_cam_upll.parent = clk_upll;
......
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