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
  33 #include <linux/interrupt.h>
  34 #include <linux/ioport.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/hardware/clock.h>
  42 #include <asm/arch/regs-clock.h>
  43
  44 #include "clock.h"
  45 #include "cpu.h"
  46
  47 /* S3C2440 extended clock support */
  48
  49 static struct clk s3c2440_clk_upll = {
  50         .name           = "upll",
  51         .id             = -1,
  52 };
  53
  54 static struct clk s3c2440_clk_cam = {
  55         .name           = "camif",
  56         .id             = -1,
  57         .enable         = s3c24xx_clkcon_enable,
  58         .ctrlbit        = S3C2440_CLKCON_CAMERA,
  59 };
  60
  61 static struct clk s3c2440_clk_ac97 = {
  62         .name           = "ac97",
  63         .id             = -1,
  64         .enable         = s3c24xx_clkcon_enable,
  65         .ctrlbit        = S3C2440_CLKCON_CAMERA,
  66 };
  67
  68 static int s3c2440_clk_add(struct sys_device *sysdev)
  69 {
  70         unsigned long upllcon = __raw_readl(S3C2410_UPLLCON);
  71         unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
  72         struct clk *clk_h;
  73         struct clk *clk_p;
  74         struct clk *clk_xtal;
  75
  76         clk_xtal = clk_get(NULL, "xtal");
  77         if (IS_ERR(clk_xtal)) {
  78                 printk(KERN_ERR "S3C2440: Failed to get clk_xtal\n");
  79                 return -EINVAL;
  80         }
  81
  82         s3c2440_clk_upll.rate = s3c2410_get_pll(upllcon, clk_xtal->rate);
  83
  84         printk("S3C2440: Clock Support, UPLL %ld.%03ld MHz, DVS %s\n",
  85                print_mhz(s3c2440_clk_upll.rate),
  86                (camdivn & S3C2440_CAMDIVN_DVSEN) ? "on" : "off");
  87
  88         clk_p = clk_get(NULL, "pclk");
  89         clk_h = clk_get(NULL, "hclk");
  90
  91         if (IS_ERR(clk_p) || IS_ERR(clk_h)) {
  92                 printk(KERN_ERR "S3C2440: Failed to get parent clocks\n");
  93                 return -EINVAL;
  94         }
  95
  96         s3c2440_clk_cam.parent = clk_h;
  97         s3c2440_clk_ac97.parent = clk_p;
  98
  99         s3c24xx_register_clock(&s3c2440_clk_ac97);
 100         s3c24xx_register_clock(&s3c2440_clk_cam);
 101         s3c24xx_register_clock(&s3c2440_clk_upll);
 102
 103         clk_disable(&s3c2440_clk_ac97);
 104         clk_disable(&s3c2440_clk_cam);
 105
 106         return 0;
 107 }
 108
 109 static struct sysdev_driver s3c2440_clk_driver = {
 110         .add    = s3c2440_clk_add,
 111 };
 112
 113 static __init int s3c24xx_clk_driver(void)
 114 {
 115         return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_clk_driver);
 116 }
 117
 118 arch_initcall(s3c24xx_clk_driver);