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a21765a7 | 1 | /* linux/arch/arm/plat-s3c24xx/s3c244x.c |
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2 | * |
3 | * Copyright (c) 2004-2006 Simtec Electronics | |
4 | * Ben Dooks <ben@simtec.co.uk> | |
5 | * | |
e4d06e39 | 6 | * Samsung S3C2440 and S3C2442 Mobile CPU support (not S3C2443) |
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7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/timer.h> | |
18 | #include <linux/init.h> | |
b6d1f542 | 19 | #include <linux/serial_core.h> |
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20 | #include <linux/platform_device.h> |
21 | #include <linux/sysdev.h> | |
22 | #include <linux/clk.h> | |
fced80c7 | 23 | #include <linux/io.h> |
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24 | |
25 | #include <asm/mach/arch.h> | |
26 | #include <asm/mach/map.h> | |
27 | #include <asm/mach/irq.h> | |
28 | ||
a09e64fb | 29 | #include <mach/hardware.h> |
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30 | #include <asm/irq.h> |
31 | ||
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32 | #include <plat/cpu-freq.h> |
33 | ||
a09e64fb | 34 | #include <mach/regs-clock.h> |
a2b7ba9c | 35 | #include <plat/regs-serial.h> |
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36 | #include <mach/regs-gpio.h> |
37 | #include <mach/regs-gpioj.h> | |
38 | #include <mach/regs-dsc.h> | |
96ce2385 | 39 | |
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40 | #include <plat/s3c2410.h> |
41 | #include <plat/s3c2440.h> | |
96ce2385 | 42 | #include "s3c244x.h" |
d5120ae7 | 43 | #include <plat/clock.h> |
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44 | #include <plat/devs.h> |
45 | #include <plat/cpu.h> | |
46 | #include <plat/pm.h> | |
e24b864a | 47 | #include <plat/pll.h> |
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48 | |
49 | static struct map_desc s3c244x_iodesc[] __initdata = { | |
50 | IODESC_ENT(CLKPWR), | |
51 | IODESC_ENT(TIMER), | |
52 | IODESC_ENT(WATCHDOG), | |
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53 | }; |
54 | ||
55 | /* uart initialisation */ | |
56 | ||
57 | void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no) | |
58 | { | |
59 | s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no); | |
60 | } | |
61 | ||
74b265d4 | 62 | void __init s3c244x_map_io(void) |
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63 | { |
64 | /* register our io-tables */ | |
65 | ||
66 | iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc)); | |
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67 | |
68 | /* rename any peripherals used differing from the s3c2410 */ | |
69 | ||
90239bbd | 70 | s3c_device_sdi.name = "s3c2440-sdi"; |
3e1b776c | 71 | s3c_device_i2c0.name = "s3c2440-i2c"; |
96ce2385 | 72 | s3c_device_nand.name = "s3c2440-nand"; |
ce8877b5 | 73 | s3c_device_ts.name = "s3c2440-ts"; |
b8ccca4a | 74 | s3c_device_usbgadget.name = "s3c2440-usbgadget"; |
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75 | } |
76 | ||
e425382e | 77 | void __init_or_cpufreq s3c244x_setup_clocks(void) |
96ce2385 | 78 | { |
e425382e | 79 | struct clk *xtal_clk; |
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80 | unsigned long clkdiv; |
81 | unsigned long camdiv; | |
e425382e | 82 | unsigned long xtal; |
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83 | unsigned long hclk, fclk, pclk; |
84 | int hdiv = 1; | |
85 | ||
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86 | xtal_clk = clk_get(NULL, "xtal"); |
87 | xtal = clk_get_rate(xtal_clk); | |
88 | clk_put(xtal_clk); | |
96ce2385 | 89 | |
e24b864a | 90 | fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2; |
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91 | |
92 | clkdiv = __raw_readl(S3C2410_CLKDIVN); | |
93 | camdiv = __raw_readl(S3C2440_CAMDIVN); | |
94 | ||
95 | /* work out clock scalings */ | |
96 | ||
97 | switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) { | |
98 | case S3C2440_CLKDIVN_HDIVN_1: | |
99 | hdiv = 1; | |
100 | break; | |
101 | ||
102 | case S3C2440_CLKDIVN_HDIVN_2: | |
103 | hdiv = 2; | |
104 | break; | |
105 | ||
106 | case S3C2440_CLKDIVN_HDIVN_4_8: | |
107 | hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4; | |
108 | break; | |
109 | ||
110 | case S3C2440_CLKDIVN_HDIVN_3_6: | |
111 | hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3; | |
112 | break; | |
113 | } | |
114 | ||
115 | hclk = fclk / hdiv; | |
e425382e | 116 | pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN) ? 2 : 1); |
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117 | |
118 | /* print brief summary of clocks, etc */ | |
119 | ||
120 | printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n", | |
121 | print_mhz(fclk), print_mhz(hclk), print_mhz(pclk)); | |
122 | ||
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123 | s3c24xx_setup_clocks(fclk, hclk, pclk); |
124 | } | |
125 | ||
126 | void __init s3c244x_init_clocks(int xtal) | |
127 | { | |
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128 | /* initialise the clocks here, to allow other things like the |
129 | * console to use them, and to add new ones after the initialisation | |
130 | */ | |
131 | ||
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132 | s3c24xx_register_baseclocks(xtal); |
133 | s3c244x_setup_clocks(); | |
99c13853 | 134 | s3c2410_baseclk_add(); |
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135 | } |
136 | ||
137 | #ifdef CONFIG_PM | |
138 | ||
139 | static struct sleep_save s3c244x_sleep[] = { | |
140 | SAVE_ITEM(S3C2440_DSC0), | |
141 | SAVE_ITEM(S3C2440_DSC1), | |
142 | SAVE_ITEM(S3C2440_GPJDAT), | |
143 | SAVE_ITEM(S3C2440_GPJCON), | |
144 | SAVE_ITEM(S3C2440_GPJUP) | |
145 | }; | |
146 | ||
147 | static int s3c244x_suspend(struct sys_device *dev, pm_message_t state) | |
148 | { | |
6419711a | 149 | s3c_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep)); |
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150 | return 0; |
151 | } | |
152 | ||
153 | static int s3c244x_resume(struct sys_device *dev) | |
154 | { | |
6419711a | 155 | s3c_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep)); |
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156 | return 0; |
157 | } | |
158 | ||
159 | #else | |
160 | #define s3c244x_suspend NULL | |
161 | #define s3c244x_resume NULL | |
162 | #endif | |
163 | ||
164 | /* Since the S3C2442 and S3C2440 share items, put both sysclasses here */ | |
165 | ||
166 | struct sysdev_class s3c2440_sysclass = { | |
af5ca3f4 | 167 | .name = "s3c2440-core", |
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168 | .suspend = s3c244x_suspend, |
169 | .resume = s3c244x_resume | |
170 | }; | |
171 | ||
172 | struct sysdev_class s3c2442_sysclass = { | |
af5ca3f4 | 173 | .name = "s3c2442-core", |
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174 | .suspend = s3c244x_suspend, |
175 | .resume = s3c244x_resume | |
176 | }; | |
177 | ||
178 | /* need to register class before we actually register the device, and | |
179 | * we also need to ensure that it has been initialised before any of the | |
180 | * drivers even try to use it (even if not on an s3c2440 based system) | |
181 | * as a driver which may support both 2410 and 2440 may try and use it. | |
182 | */ | |
183 | ||
184 | static int __init s3c2440_core_init(void) | |
185 | { | |
186 | return sysdev_class_register(&s3c2440_sysclass); | |
187 | } | |
188 | ||
189 | core_initcall(s3c2440_core_init); | |
190 | ||
191 | static int __init s3c2442_core_init(void) | |
192 | { | |
193 | return sysdev_class_register(&s3c2442_sysclass); | |
194 | } | |
195 | ||
196 | core_initcall(s3c2442_core_init); |