arch/arm/mach-s3c2410/s3c2440-clock.c

   1 /* linux/arch/arm/mach-s3c2410/s3c2440-clock.c
   2  *
   3  * Copyright (c) 2004-2005 Simtec Electronics
   4  *      http://armlinux.simtec.co.uk/
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *
   7  * S3C2440 Clock support
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22 */
  23
  24 #include <linux/init.h>
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/list.h>
  28 #include <linux/errno.h>
  29 #include <linux/err.h>
  30 #include <linux/device.h>
  31 #include <linux/sysdev.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/ioport.h>
  34 #include <linux/clk.h>
  35
  36 #include <asm/hardware.h>
  37 #include <asm/atomic.h>
  38 #include <asm/irq.h>
  39 #include <asm/io.h>
  40
  41 #include <asm/arch/regs-clock.h>
  42
  43 #include "clock.h"
  44 #include "cpu.h"
  45
  46 /* S3C2440 extended clock support */
  47
  48 static struct clk s3c2440_clk_upll = {
  49         .name           = "upll",
  50         .id             = -1,
  51 };
  52
  53 static struct clk s3c2440_clk_cam = {
  54         .name           = "camif",
  55         .id             = -1,
  56         .enable         = s3c24xx_clkcon_enable,
  57         .ctrlbit        = S3C2440_CLKCON_CAMERA,
  58 };
  59
  60 static struct clk s3c2440_clk_ac97 = {
  61         .name           = "ac97",
  62         .id             = -1,
  63         .enable         = s3c24xx_clkcon_enable,
  64         .ctrlbit        = S3C2440_CLKCON_CAMERA,
  65 };
  66
  67 static int s3c2440_clk_add(struct sys_device *sysdev)
  68 {
  69         unsigned long upllcon = __raw_readl(S3C2410_UPLLCON);
  70         unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
  71         struct clk *clk_h;
  72         struct clk *clk_p;
  73         struct clk *clk_xtal;
  74
  75         clk_xtal = clk_get(NULL, "xtal");
  76         if (IS_ERR(clk_xtal)) {
  77                 printk(KERN_ERR "S3C2440: Failed to get clk_xtal\n");
  78                 return -EINVAL;
  79         }
  80
  81         s3c2440_clk_upll.rate = s3c2410_get_pll(upllcon, clk_xtal->rate);
  82
  83         printk("S3C2440: Clock Support, UPLL %ld.%03ld MHz, DVS %s\n",
  84                print_mhz(s3c2440_clk_upll.rate),
  85                (camdivn & S3C2440_CAMDIVN_DVSEN) ? "on" : "off");
  86
  87         clk_p = clk_get(NULL, "pclk");
  88         clk_h = clk_get(NULL, "hclk");
  89
  90         if (IS_ERR(clk_p) || IS_ERR(clk_h)) {
  91                 printk(KERN_ERR "S3C2440: Failed to get parent clocks\n");
  92                 return -EINVAL;
  93         }
  94
  95         s3c2440_clk_cam.parent = clk_h;
  96         s3c2440_clk_ac97.parent = clk_p;
  97
  98         s3c24xx_register_clock(&s3c2440_clk_ac97);
  99         s3c24xx_register_clock(&s3c2440_clk_cam);
 100         s3c24xx_register_clock(&s3c2440_clk_upll);
 101
 102         clk_disable(&s3c2440_clk_ac97);
 103         clk_disable(&s3c2440_clk_cam);
 104
 105         return 0;
 106 }
 107
 108 static struct sysdev_driver s3c2440_clk_driver = {
 109         .add    = s3c2440_clk_add,
 110 };
 111
 112 static __init int s3c24xx_clk_driver(void)
 113 {
 114         return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_clk_driver);
 115 }
 116
 117 arch_initcall(s3c24xx_clk_driver);