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Linux/arch/arm/plat-s3c24xx/s3c244x-clock.c

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  1 /* linux/arch/arm/plat-s3c24xx/s3c24xx-clock.c
  2  *
  3  * Copyright (c) 2004-2005,2008 Simtec Electronics
  4  *      http://armlinux.simtec.co.uk/
  5  *      Ben Dooks <ben@simtec.co.uk>
  6  *
  7  * S3C2440/S3C2442 Common 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 #include <linux/io.h>
 36 
 37 #include <mach/hardware.h>
 38 #include <asm/atomic.h>
 39 #include <asm/irq.h>
 40 
 41 #include <mach/regs-clock.h>
 42 
 43 #include <plat/clock.h>
 44 #include <plat/cpu.h>
 45 
 46 static int s3c2440_setparent_armclk(struct clk *clk, struct clk *parent)
 47 {
 48         unsigned long camdivn;
 49         unsigned long dvs;
 50 
 51         if (parent == &clk_f)
 52                 dvs = 0;
 53         else if (parent == &clk_h)
 54                 dvs = S3C2440_CAMDIVN_DVSEN;
 55         else
 56                 return -EINVAL;
 57 
 58         clk->parent = parent;
 59 
 60         camdivn  = __raw_readl(S3C2440_CAMDIVN);
 61         camdivn &= ~S3C2440_CAMDIVN_DVSEN;
 62         camdivn |= dvs;
 63         __raw_writel(camdivn, S3C2440_CAMDIVN);
 64 
 65         return 0;
 66 }
 67 
 68 static struct clk clk_arm = {
 69         .name           = "armclk",
 70         .id             = -1,
 71         .set_parent     = s3c2440_setparent_armclk,
 72 };
 73 
 74 static int s3c244x_clk_add(struct sys_device *sysdev)
 75 {
 76         unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
 77         unsigned long clkdivn;
 78         struct clk *clock_upll;
 79         int ret;
 80 
 81         printk("S3C244X: Clock Support, DVS %s\n",
 82                (camdivn & S3C2440_CAMDIVN_DVSEN) ? "on" : "off");
 83 
 84         clk_arm.parent = (camdivn & S3C2440_CAMDIVN_DVSEN) ? &clk_h : &clk_f;
 85 
 86         ret = s3c24xx_register_clock(&clk_arm);
 87         if (ret < 0) {
 88                 printk(KERN_ERR "S3C24XX: Failed to add armclk (%d)\n", ret);
 89                 return ret;
 90         }
 91 
 92         clock_upll = clk_get(NULL, "upll");
 93         if (IS_ERR(clock_upll)) {
 94                 printk(KERN_ERR "S3C244X: Failed to get upll clock\n");
 95                 return -ENOENT;
 96         }
 97 
 98         /* check rate of UPLL, and if it is near 96MHz, then change
 99          * to using half the UPLL rate for the system */
100 
101         if (clk_get_rate(clock_upll) > (94 * MHZ)) {
102                 clk_usb_bus.rate = clk_get_rate(clock_upll) / 2;
103 
104                 spin_lock(&clocks_lock);
105 
106                 clkdivn = __raw_readl(S3C2410_CLKDIVN);
107                 clkdivn |= S3C2440_CLKDIVN_UCLK;
108                 __raw_writel(clkdivn, S3C2410_CLKDIVN);
109 
110                 spin_unlock(&clocks_lock);
111         }
112 
113         return 0;
114 }
115 
116 static struct sysdev_driver s3c2440_clk_driver = {
117         .add            = s3c244x_clk_add,
118 };
119 
120 static int s3c2440_clk_init(void)
121 {
122         return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_clk_driver);
123 }
124 
125 arch_initcall(s3c2440_clk_init);
126 
127 static struct sysdev_driver s3c2442_clk_driver = {
128         .add            = s3c244x_clk_add,
129 };
130 
131 static int s3c2442_clk_init(void)
132 {
133         return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_clk_driver);
134 }
135 
136 arch_initcall(s3c2442_clk_init);
137 

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