Pull sn-features into release branch
[sfrench/cifs-2.6.git] / 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);