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1 | /* linux/arch/arm/plat-s3c24xx/s3c24xx-clock.c |
2 | * |
3 | * Copyright (c) 2004-2008 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 | .ops = &(struct clk_ops) { |
72 | .set_parent = s3c2440_setparent_armclk, |
73 | }, |
74 | }; |
75 | |
76 | static int s3c244x_clk_add(struct sys_device *sysdev) |
77 | { |
78 | unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN); |
79 | unsigned long clkdivn; |
80 | struct clk *clock_upll; |
81 | int ret; |
82 | |
83 | printk("S3C244X: Clock Support, DVS %s\n", |
84 | (camdivn & S3C2440_CAMDIVN_DVSEN) ? "on" : "off"); |
85 | |
86 | clk_arm.parent = (camdivn & S3C2440_CAMDIVN_DVSEN) ? &clk_h : &clk_f; |
87 | |
88 | ret = s3c24xx_register_clock(&clk_arm); |
89 | if (ret < 0) { |
90 | printk(KERN_ERR "S3C24XX: Failed to add armclk (%d)\n", ret); |
91 | return ret; |
92 | } |
93 | |
94 | clock_upll = clk_get(NULL, "upll"); |
95 | if (IS_ERR(clock_upll)) { |
96 | printk(KERN_ERR "S3C244X: Failed to get upll clock\n"); |
97 | return -ENOENT; |
98 | } |
99 | |
100 | /* check rate of UPLL, and if it is near 96MHz, then change |
101 | * to using half the UPLL rate for the system */ |
102 | |
103 | if (clk_get_rate(clock_upll) > (94 * MHZ)) { |
104 | clk_usb_bus.rate = clk_get_rate(clock_upll) / 2; |
105 | |
106 | spin_lock(&clocks_lock); |
107 | |
108 | clkdivn = __raw_readl(S3C2410_CLKDIVN); |
109 | clkdivn |= S3C2440_CLKDIVN_UCLK; |
110 | __raw_writel(clkdivn, S3C2410_CLKDIVN); |
111 | |
112 | spin_unlock(&clocks_lock); |
113 | } |
114 | |
115 | return 0; |
116 | } |
117 | |
118 | static struct sysdev_driver s3c2440_clk_driver = { |
119 | .add = s3c244x_clk_add, |
120 | }; |
121 | |
122 | static int s3c2440_clk_init(void) |
123 | { |
124 | return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_clk_driver); |
125 | } |
126 | |
127 | arch_initcall(s3c2440_clk_init); |
128 | |
129 | static struct sysdev_driver s3c2442_clk_driver = { |
130 | .add = s3c244x_clk_add, |
131 | }; |
132 | |
133 | static int s3c2442_clk_init(void) |
134 | { |
135 | return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_clk_driver); |
136 | } |
137 | |
138 | arch_initcall(s3c2442_clk_init); |
139 |
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