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a21765a7 | 1 | /* linux/arch/arm/mach-s3c2412/s3c2412.c |
68d9ab39 BD |
2 | * |
3 | * Copyright (c) 2006 Simtec Electronics | |
4 | * Ben Dooks <ben@simtec.co.uk> | |
5 | * | |
6 | * http://armlinux.simtec.co.uk/. | |
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. | |
68d9ab39 BD |
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> | |
eca8c242 | 19 | #include <linux/delay.h> |
68d9ab39 | 20 | #include <linux/sysdev.h> |
b6d1f542 | 21 | #include <linux/serial_core.h> |
68d9ab39 BD |
22 | #include <linux/platform_device.h> |
23 | ||
24 | #include <asm/mach/arch.h> | |
25 | #include <asm/mach/map.h> | |
26 | #include <asm/mach/irq.h> | |
27 | ||
28 | #include <asm/hardware.h> | |
c84cbb24 | 29 | #include <asm/proc-fns.h> |
68d9ab39 BD |
30 | #include <asm/io.h> |
31 | #include <asm/irq.h> | |
32 | ||
eca8c242 | 33 | #include <asm/arch/reset.h> |
c84cbb24 BD |
34 | #include <asm/arch/idle.h> |
35 | ||
68d9ab39 | 36 | #include <asm/arch/regs-clock.h> |
531b617c | 37 | #include <asm/plat-s3c/regs-serial.h> |
c84cbb24 | 38 | #include <asm/arch/regs-power.h> |
68d9ab39 BD |
39 | #include <asm/arch/regs-gpio.h> |
40 | #include <asm/arch/regs-gpioj.h> | |
41 | #include <asm/arch/regs-dsc.h> | |
06cfa556 | 42 | #include <asm/plat-s3c24xx/regs-spi.h> |
eca8c242 | 43 | #include <asm/arch/regs-s3c2412.h> |
68d9ab39 | 44 | |
a21765a7 BD |
45 | #include <asm/plat-s3c24xx/s3c2412.h> |
46 | #include <asm/plat-s3c24xx/cpu.h> | |
47 | #include <asm/plat-s3c24xx/devs.h> | |
48 | #include <asm/plat-s3c24xx/clock.h> | |
49 | #include <asm/plat-s3c24xx/pm.h> | |
68d9ab39 BD |
50 | |
51 | #ifndef CONFIG_CPU_S3C2412_ONLY | |
52 | void __iomem *s3c24xx_va_gpio2 = S3C24XX_VA_GPIO; | |
50dedf16 BD |
53 | |
54 | static inline void s3c2412_init_gpio2(void) | |
55 | { | |
56 | s3c24xx_va_gpio2 = S3C24XX_VA_GPIO + 0x10; | |
57 | } | |
58 | #else | |
59 | #define s3c2412_init_gpio2() do { } while(0) | |
68d9ab39 BD |
60 | #endif |
61 | ||
62 | /* Initial IO mappings */ | |
63 | ||
64 | static struct map_desc s3c2412_iodesc[] __initdata = { | |
65 | IODESC_ENT(CLKPWR), | |
68d9ab39 | 66 | IODESC_ENT(TIMER), |
68d9ab39 BD |
67 | IODESC_ENT(WATCHDOG), |
68 | }; | |
69 | ||
70 | /* uart registration process */ | |
71 | ||
72 | void __init s3c2412_init_uarts(struct s3c2410_uartcfg *cfg, int no) | |
73 | { | |
74 | s3c24xx_init_uartdevs("s3c2412-uart", s3c2410_uart_resources, cfg, no); | |
75 | ||
76 | /* rename devices that are s3c2412/s3c2413 specific */ | |
77 | s3c_device_sdi.name = "s3c2412-sdi"; | |
72d70d06 | 78 | s3c_device_lcd.name = "s3c2412-lcd"; |
68d9ab39 | 79 | s3c_device_nand.name = "s3c2412-nand"; |
e903382c SSP |
80 | |
81 | /* spi channel related changes, s3c2412/13 specific */ | |
82 | s3c_device_spi0.name = "s3c2412-spi"; | |
83 | s3c_device_spi0.resource[0].end = S3C24XX_PA_SPI + 0x24; | |
84 | s3c_device_spi1.name = "s3c2412-spi"; | |
85 | s3c_device_spi1.resource[0].start = S3C24XX_PA_SPI + S3C2412_SPI1; | |
86 | s3c_device_spi1.resource[0].end = S3C24XX_PA_SPI + S3C2412_SPI1 + 0x24; | |
87 | ||
68d9ab39 BD |
88 | } |
89 | ||
c84cbb24 BD |
90 | /* s3c2412_idle |
91 | * | |
92 | * use the standard idle call by ensuring the idle mode | |
93 | * in power config, then issuing the idle co-processor | |
94 | * instruction | |
95 | */ | |
96 | ||
97 | static void s3c2412_idle(void) | |
98 | { | |
99 | unsigned long tmp; | |
100 | ||
101 | /* ensure our idle mode is to go to idle */ | |
102 | ||
103 | tmp = __raw_readl(S3C2412_PWRCFG); | |
104 | tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK; | |
105 | tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE; | |
106 | __raw_writel(tmp, S3C2412_PWRCFG); | |
107 | ||
108 | cpu_do_idle(); | |
109 | } | |
110 | ||
eca8c242 BD |
111 | static void s3c2412_hard_reset(void) |
112 | { | |
113 | /* errata "Watch-dog/Software Reset Problem" specifies that | |
114 | * this reset must be done with the SYSCLK sourced from | |
115 | * EXTCLK instead of FOUT to avoid a glitch in the reset | |
116 | * mechanism. | |
117 | * | |
118 | * See the watchdog section of the S3C2412 manual for more | |
119 | * information on this fix. | |
120 | */ | |
121 | ||
122 | __raw_writel(0x00, S3C2412_CLKSRC); | |
123 | __raw_writel(S3C2412_SWRST_RESET, S3C2412_SWRST); | |
124 | ||
125 | mdelay(1); | |
126 | } | |
127 | ||
68d9ab39 BD |
128 | /* s3c2412_map_io |
129 | * | |
130 | * register the standard cpu IO areas, and any passed in from the | |
131 | * machine specific initialisation. | |
132 | */ | |
133 | ||
134 | void __init s3c2412_map_io(struct map_desc *mach_desc, int mach_size) | |
135 | { | |
136 | /* move base of IO */ | |
137 | ||
50dedf16 | 138 | s3c2412_init_gpio2(); |
68d9ab39 | 139 | |
c84cbb24 BD |
140 | /* set our idle function */ |
141 | ||
142 | s3c24xx_idle = s3c2412_idle; | |
143 | ||
eca8c242 BD |
144 | /* set custom reset hook */ |
145 | ||
146 | s3c24xx_reset_hook = s3c2412_hard_reset; | |
147 | ||
68d9ab39 BD |
148 | /* register our io-tables */ |
149 | ||
150 | iotable_init(s3c2412_iodesc, ARRAY_SIZE(s3c2412_iodesc)); | |
151 | iotable_init(mach_desc, mach_size); | |
152 | } | |
153 | ||
154 | void __init s3c2412_init_clocks(int xtal) | |
155 | { | |
156 | unsigned long tmp; | |
157 | unsigned long fclk; | |
158 | unsigned long hclk; | |
159 | unsigned long pclk; | |
160 | ||
161 | /* now we've got our machine bits initialised, work out what | |
162 | * clocks we've got */ | |
163 | ||
164 | fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal*2); | |
165 | ||
166 | tmp = __raw_readl(S3C2410_CLKDIVN); | |
167 | ||
168 | /* work out clock scalings */ | |
169 | ||
170 | hclk = fclk / ((tmp & S3C2412_CLKDIVN_HDIVN_MASK) + 1); | |
171 | hclk /= ((tmp & S3C2421_CLKDIVN_ARMDIVN) ? 2 : 1); | |
172 | pclk = hclk / ((tmp & S3C2412_CLKDIVN_PDIVN) ? 2 : 1); | |
173 | ||
174 | /* print brieft summary of clocks, etc */ | |
175 | ||
176 | printk("S3C2412: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n", | |
177 | print_mhz(fclk), print_mhz(hclk), print_mhz(pclk)); | |
178 | ||
179 | /* initialise the clocks here, to allow other things like the | |
180 | * console to use them | |
181 | */ | |
182 | ||
183 | s3c24xx_setup_clocks(xtal, fclk, hclk, pclk); | |
184 | s3c2412_baseclk_add(); | |
185 | } | |
186 | ||
187 | /* need to register class before we actually register the device, and | |
188 | * we also need to ensure that it has been initialised before any of the | |
189 | * drivers even try to use it (even if not on an s3c2412 based system) | |
190 | * as a driver which may support both 2410 and 2440 may try and use it. | |
191 | */ | |
192 | ||
68d9ab39 BD |
193 | struct sysdev_class s3c2412_sysclass = { |
194 | set_kset_name("s3c2412-core"), | |
68d9ab39 BD |
195 | }; |
196 | ||
197 | static int __init s3c2412_core_init(void) | |
198 | { | |
199 | return sysdev_class_register(&s3c2412_sysclass); | |
200 | } | |
201 | ||
202 | core_initcall(s3c2412_core_init); | |
203 | ||
204 | static struct sys_device s3c2412_sysdev = { | |
205 | .cls = &s3c2412_sysclass, | |
206 | }; | |
207 | ||
208 | int __init s3c2412_init(void) | |
209 | { | |
210 | printk("S3C2412: Initialising architecture\n"); | |
211 | ||
212 | return sysdev_register(&s3c2412_sysdev); | |
213 | } |