1 /* linux/arch/arm/mach-s3c2442/s3c2442.c
3 * Copyright (c) 2004-2005 Simtec Electronics
4 * http://armlinux.simtec.co.uk/
5 * Ben Dooks <ben@simtec.co.uk>
7 * S3C2442 core and lock support
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.
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.
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
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/syscore_ops.h>
33 #include <linux/interrupt.h>
34 #include <linux/ioport.h>
35 #include <linux/mutex.h>
36 #include <linux/gpio.h>
37 #include <linux/clk.h>
40 #include <mach/hardware.h>
41 #include <asm/atomic.h>
44 #include <mach/regs-clock.h>
46 #include <plat/clock.h>
48 #include <plat/s3c244x.h>
51 #include <plat/gpio-core.h>
52 #include <plat/gpio-cfg.h>
53 #include <plat/gpio-cfg-helpers.h>
55 /* S3C2442 extended clock support */
57 static unsigned long s3c2442_camif_upll_round(struct clk *clk,
60 unsigned long parent_rate = clk_get_rate(clk->parent);
63 if (rate > parent_rate)
66 div = parent_rate / rate;
69 return parent_rate / 3;
71 /* note, we remove the +/- 1 calculations for the divisor */
80 return parent_rate / (div * 2);
83 static int s3c2442_camif_upll_setrate(struct clk *clk, unsigned long rate)
85 unsigned long parent_rate = clk_get_rate(clk->parent);
86 unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
88 rate = s3c2442_camif_upll_round(clk, rate);
90 camdivn &= ~S3C2442_CAMDIVN_CAMCLK_DIV3;
92 if (rate == parent_rate) {
93 camdivn &= ~S3C2440_CAMDIVN_CAMCLK_SEL;
94 } else if ((parent_rate / rate) == 3) {
95 camdivn |= S3C2440_CAMDIVN_CAMCLK_SEL;
96 camdivn |= S3C2442_CAMDIVN_CAMCLK_DIV3;
98 camdivn &= ~S3C2440_CAMDIVN_CAMCLK_MASK;
99 camdivn |= S3C2440_CAMDIVN_CAMCLK_SEL;
100 camdivn |= (((parent_rate / rate) / 2) - 1);
103 __raw_writel(camdivn, S3C2440_CAMDIVN);
108 /* Extra S3C2442 clocks */
110 static struct clk s3c2442_clk_cam = {
113 .enable = s3c2410_clkcon_enable,
114 .ctrlbit = S3C2440_CLKCON_CAMERA,
117 static struct clk s3c2442_clk_cam_upll = {
118 .name = "camif-upll",
120 .ops = &(struct clk_ops) {
121 .set_rate = s3c2442_camif_upll_setrate,
122 .round_rate = s3c2442_camif_upll_round,
126 static int s3c2442_clk_add(struct sys_device *sysdev)
128 struct clk *clock_upll;
132 clock_p = clk_get(NULL, "pclk");
133 clock_h = clk_get(NULL, "hclk");
134 clock_upll = clk_get(NULL, "upll");
136 if (IS_ERR(clock_p) || IS_ERR(clock_h) || IS_ERR(clock_upll)) {
137 printk(KERN_ERR "S3C2442: Failed to get parent clocks\n");
141 s3c2442_clk_cam.parent = clock_h;
142 s3c2442_clk_cam_upll.parent = clock_upll;
144 s3c24xx_register_clock(&s3c2442_clk_cam);
145 s3c24xx_register_clock(&s3c2442_clk_cam_upll);
147 clk_disable(&s3c2442_clk_cam);
152 static struct sysdev_driver s3c2442_clk_driver = {
153 .add = s3c2442_clk_add,
156 static __init int s3c2442_clk_init(void)
158 return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_clk_driver);
161 arch_initcall(s3c2442_clk_init);
164 static struct sys_device s3c2442_sysdev = {
165 .cls = &s3c2442_sysclass,
168 int __init s3c2442_init(void)
170 printk("S3C2442: Initialising architecture\n");
172 register_syscore_ops(&s3c2410_pm_syscore_ops);
173 register_syscore_ops(&s3c244x_pm_syscore_ops);
174 register_syscore_ops(&s3c24xx_irq_syscore_ops);
176 return sysdev_register(&s3c2442_sysdev);
179 void __init s3c2442_map_io(void)
183 s3c24xx_gpiocfg_default.set_pull = s3c_gpio_setpull_1down;
184 s3c24xx_gpiocfg_default.get_pull = s3c_gpio_getpull_1down;