151 lines
3.7 KiB
C
151 lines
3.7 KiB
C
/* linux/arch/arm/mach-s3c2440/clock.c
|
|
*
|
|
* Copyright (c) 2004-2005 Simtec Electronics
|
|
* http://armlinux.simtec.co.uk/
|
|
* Ben Dooks <ben@simtec.co.uk>
|
|
*
|
|
* S3C2440 Clock support
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#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 <asm/hardware.h>
|
|
#include <asm/atomic.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/io.h>
|
|
|
|
#include <asm/arch/regs-clock.h>
|
|
|
|
#include <asm/plat-s3c24xx/clock.h>
|
|
#include <asm/plat-s3c24xx/cpu.h>
|
|
|
|
/* S3C2440 extended clock support */
|
|
|
|
static unsigned long s3c2440_camif_upll_round(struct clk *clk,
|
|
unsigned long rate)
|
|
{
|
|
unsigned long parent_rate = clk_get_rate(clk->parent);
|
|
int div;
|
|
|
|
if (rate > parent_rate)
|
|
return parent_rate;
|
|
|
|
/* note, we remove the +/- 1 calculations for the divisor */
|
|
|
|
div = (parent_rate / rate) / 2;
|
|
|
|
if (div < 1)
|
|
div = 1;
|
|
else if (div > 16)
|
|
div = 16;
|
|
|
|
return parent_rate / (div * 2);
|
|
}
|
|
|
|
static int s3c2440_camif_upll_setrate(struct clk *clk, unsigned long rate)
|
|
{
|
|
unsigned long parent_rate = clk_get_rate(clk->parent);
|
|
unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
|
|
|
|
rate = s3c2440_camif_upll_round(clk, rate);
|
|
|
|
camdivn &= ~(S3C2440_CAMDIVN_CAMCLK_SEL | S3C2440_CAMDIVN_CAMCLK_MASK);
|
|
|
|
if (rate != parent_rate) {
|
|
camdivn |= S3C2440_CAMDIVN_CAMCLK_SEL;
|
|
camdivn |= (((parent_rate / rate) / 2) - 1);
|
|
}
|
|
|
|
__raw_writel(camdivn, S3C2440_CAMDIVN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Extra S3C2440 clocks */
|
|
|
|
static struct clk s3c2440_clk_cam = {
|
|
.name = "camif",
|
|
.id = -1,
|
|
.enable = s3c2410_clkcon_enable,
|
|
.ctrlbit = S3C2440_CLKCON_CAMERA,
|
|
};
|
|
|
|
static struct clk s3c2440_clk_cam_upll = {
|
|
.name = "camif-upll",
|
|
.id = -1,
|
|
.set_rate = s3c2440_camif_upll_setrate,
|
|
.round_rate = s3c2440_camif_upll_round,
|
|
};
|
|
|
|
static struct clk s3c2440_clk_ac97 = {
|
|
.name = "ac97",
|
|
.id = -1,
|
|
.enable = s3c2410_clkcon_enable,
|
|
.ctrlbit = S3C2440_CLKCON_CAMERA,
|
|
};
|
|
|
|
static int s3c2440_clk_add(struct sys_device *sysdev)
|
|
{
|
|
struct clk *clock_upll;
|
|
struct clk *clock_h;
|
|
struct clk *clock_p;
|
|
|
|
clock_p = clk_get(NULL, "pclk");
|
|
clock_h = clk_get(NULL, "hclk");
|
|
clock_upll = clk_get(NULL, "upll");
|
|
|
|
if (IS_ERR(clock_p) || IS_ERR(clock_h) || IS_ERR(clock_upll)) {
|
|
printk(KERN_ERR "S3C2440: Failed to get parent clocks\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
s3c2440_clk_cam.parent = clock_h;
|
|
s3c2440_clk_ac97.parent = clock_p;
|
|
s3c2440_clk_cam_upll.parent = clock_upll;
|
|
|
|
s3c24xx_register_clock(&s3c2440_clk_ac97);
|
|
s3c24xx_register_clock(&s3c2440_clk_cam);
|
|
s3c24xx_register_clock(&s3c2440_clk_cam_upll);
|
|
|
|
clk_disable(&s3c2440_clk_ac97);
|
|
clk_disable(&s3c2440_clk_cam);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct sysdev_driver s3c2440_clk_driver = {
|
|
.add = s3c2440_clk_add,
|
|
};
|
|
|
|
static __init int s3c24xx_clk_driver(void)
|
|
{
|
|
return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_clk_driver);
|
|
}
|
|
|
|
arch_initcall(s3c24xx_clk_driver);
|