Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 1 | /* linux/arch/arm/plat-s3c24xx/s3c244x.c |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 2 | * |
| 3 | * Copyright (c) 2004-2006 Simtec Electronics |
| 4 | * Ben Dooks <ben@simtec.co.uk> |
| 5 | * |
Ben Dooks | e4d06e3 | 2007-02-16 12:12:31 +0100 | [diff] [blame] | 6 | * Samsung S3C2440 and S3C2442 Mobile CPU support (not S3C2443) |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 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> |
Ben Dooks | b6d1f54 | 2006-12-17 23:22:26 +0100 | [diff] [blame] | 19 | #include <linux/serial_core.h> |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 20 | #include <linux/platform_device.h> |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 21 | #include <linux/device.h> |
Rafael J. Wysocki | bb072c3 | 2011-04-22 22:03:21 +0200 | [diff] [blame] | 22 | #include <linux/syscore_ops.h> |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 23 | #include <linux/clk.h> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 24 | #include <linux/io.h> |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 25 | |
David Howells | 9f97da7 | 2012-03-28 18:30:01 +0100 | [diff] [blame] | 26 | #include <asm/system_misc.h> |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 27 | #include <asm/mach/arch.h> |
| 28 | #include <asm/mach/map.h> |
| 29 | #include <asm/mach/irq.h> |
| 30 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 31 | #include <mach/hardware.h> |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 32 | #include <asm/irq.h> |
| 33 | |
Ben Dooks | e425382 | 2008-10-21 14:06:38 +0100 | [diff] [blame] | 34 | #include <plat/cpu-freq.h> |
| 35 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 36 | #include <mach/regs-clock.h> |
Ben Dooks | a2b7ba9 | 2008-10-07 22:26:09 +0100 | [diff] [blame] | 37 | #include <plat/regs-serial.h> |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 38 | #include <mach/regs-gpio.h> |
| 39 | #include <mach/regs-gpioj.h> |
| 40 | #include <mach/regs-dsc.h> |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 41 | |
Ben Dooks | a2b7ba9 | 2008-10-07 22:26:09 +0100 | [diff] [blame] | 42 | #include <plat/s3c2410.h> |
Ben Dooks | 58bac7b | 2010-01-26 16:47:41 +0900 | [diff] [blame] | 43 | #include <plat/s3c244x.h> |
Ben Dooks | d5120ae | 2008-10-07 23:09:51 +0100 | [diff] [blame] | 44 | #include <plat/clock.h> |
Ben Dooks | a2b7ba9 | 2008-10-07 22:26:09 +0100 | [diff] [blame] | 45 | #include <plat/devs.h> |
| 46 | #include <plat/cpu.h> |
| 47 | #include <plat/pm.h> |
Ben Dooks | e24b864 | 2008-10-21 14:06:34 +0100 | [diff] [blame] | 48 | #include <plat/pll.h> |
Atul Dahiya | ef3f2dd | 2010-10-18 19:56:45 +0900 | [diff] [blame] | 49 | #include <plat/nand-core.h> |
Heiko Stuebner | c1ba544 | 2012-03-01 13:23:32 +0900 | [diff] [blame] | 50 | #include <plat/watchdog-reset.h> |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 51 | |
| 52 | static struct map_desc s3c244x_iodesc[] __initdata = { |
| 53 | IODESC_ENT(CLKPWR), |
| 54 | IODESC_ENT(TIMER), |
| 55 | IODESC_ENT(WATCHDOG), |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 56 | }; |
| 57 | |
| 58 | /* uart initialisation */ |
| 59 | |
| 60 | void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no) |
| 61 | { |
| 62 | s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no); |
| 63 | } |
| 64 | |
Ben Dooks | 74b265d | 2008-10-21 14:06:31 +0100 | [diff] [blame] | 65 | void __init s3c244x_map_io(void) |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 66 | { |
| 67 | /* register our io-tables */ |
| 68 | |
| 69 | iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc)); |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 70 | |
| 71 | /* rename any peripherals used differing from the s3c2410 */ |
| 72 | |
Ben Dooks | 90239bb | 2008-05-21 10:24:17 +0100 | [diff] [blame] | 73 | s3c_device_sdi.name = "s3c2440-sdi"; |
Ben Dooks | 3e1b776 | 2008-10-31 16:14:40 +0000 | [diff] [blame] | 74 | s3c_device_i2c0.name = "s3c2440-i2c"; |
Atul Dahiya | ef3f2dd | 2010-10-18 19:56:45 +0900 | [diff] [blame] | 75 | s3c_nand_setname("s3c2440-nand"); |
Arnaud Patard | ce8877b | 2009-12-23 19:25:05 +0000 | [diff] [blame] | 76 | s3c_device_ts.name = "s3c2440-ts"; |
Ben Dooks | b8ccca4 | 2006-06-27 22:53:03 +0100 | [diff] [blame] | 77 | s3c_device_usbgadget.name = "s3c2440-usbgadget"; |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 78 | } |
| 79 | |
Ben Dooks | e425382 | 2008-10-21 14:06:38 +0100 | [diff] [blame] | 80 | void __init_or_cpufreq s3c244x_setup_clocks(void) |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 81 | { |
Ben Dooks | e425382 | 2008-10-21 14:06:38 +0100 | [diff] [blame] | 82 | struct clk *xtal_clk; |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 83 | unsigned long clkdiv; |
| 84 | unsigned long camdiv; |
Ben Dooks | e425382 | 2008-10-21 14:06:38 +0100 | [diff] [blame] | 85 | unsigned long xtal; |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 86 | unsigned long hclk, fclk, pclk; |
| 87 | int hdiv = 1; |
| 88 | |
Ben Dooks | e425382 | 2008-10-21 14:06:38 +0100 | [diff] [blame] | 89 | xtal_clk = clk_get(NULL, "xtal"); |
| 90 | xtal = clk_get_rate(xtal_clk); |
| 91 | clk_put(xtal_clk); |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 92 | |
Ben Dooks | e24b864 | 2008-10-21 14:06:34 +0100 | [diff] [blame] | 93 | fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2; |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 94 | |
| 95 | clkdiv = __raw_readl(S3C2410_CLKDIVN); |
| 96 | camdiv = __raw_readl(S3C2440_CAMDIVN); |
| 97 | |
| 98 | /* work out clock scalings */ |
| 99 | |
| 100 | switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) { |
| 101 | case S3C2440_CLKDIVN_HDIVN_1: |
| 102 | hdiv = 1; |
| 103 | break; |
| 104 | |
| 105 | case S3C2440_CLKDIVN_HDIVN_2: |
| 106 | hdiv = 2; |
| 107 | break; |
| 108 | |
| 109 | case S3C2440_CLKDIVN_HDIVN_4_8: |
| 110 | hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4; |
| 111 | break; |
| 112 | |
| 113 | case S3C2440_CLKDIVN_HDIVN_3_6: |
| 114 | hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3; |
| 115 | break; |
| 116 | } |
| 117 | |
| 118 | hclk = fclk / hdiv; |
Ben Dooks | e425382 | 2008-10-21 14:06:38 +0100 | [diff] [blame] | 119 | pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN) ? 2 : 1); |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 120 | |
| 121 | /* print brief summary of clocks, etc */ |
| 122 | |
| 123 | printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n", |
| 124 | print_mhz(fclk), print_mhz(hclk), print_mhz(pclk)); |
| 125 | |
Ben Dooks | e425382 | 2008-10-21 14:06:38 +0100 | [diff] [blame] | 126 | s3c24xx_setup_clocks(fclk, hclk, pclk); |
| 127 | } |
| 128 | |
| 129 | void __init s3c244x_init_clocks(int xtal) |
| 130 | { |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 131 | /* initialise the clocks here, to allow other things like the |
| 132 | * console to use them, and to add new ones after the initialisation |
| 133 | */ |
| 134 | |
Ben Dooks | e425382 | 2008-10-21 14:06:38 +0100 | [diff] [blame] | 135 | s3c24xx_register_baseclocks(xtal); |
| 136 | s3c244x_setup_clocks(); |
Ben Dooks | 99c1385 | 2006-06-22 22:18:20 +0100 | [diff] [blame] | 137 | s3c2410_baseclk_add(); |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 138 | } |
| 139 | |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 140 | /* Since the S3C2442 and S3C2440 share items, put both subsystems here */ |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 141 | |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 142 | struct bus_type s3c2440_subsys = { |
Kay Sievers | af5ca3f | 2007-12-20 02:09:39 +0100 | [diff] [blame] | 143 | .name = "s3c2440-core", |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 144 | .dev_name = "s3c2440-core", |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 145 | }; |
| 146 | |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 147 | struct bus_type s3c2442_subsys = { |
Kay Sievers | af5ca3f | 2007-12-20 02:09:39 +0100 | [diff] [blame] | 148 | .name = "s3c2442-core", |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 149 | .dev_name = "s3c2442-core", |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 150 | }; |
| 151 | |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 152 | /* need to register the subsystem before we actually register the device, and |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 153 | * we also need to ensure that it has been initialised before any of the |
| 154 | * drivers even try to use it (even if not on an s3c2440 based system) |
| 155 | * as a driver which may support both 2410 and 2440 may try and use it. |
| 156 | */ |
| 157 | |
| 158 | static int __init s3c2440_core_init(void) |
| 159 | { |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 160 | return subsys_system_register(&s3c2440_subsys, NULL); |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | core_initcall(s3c2440_core_init); |
| 164 | |
| 165 | static int __init s3c2442_core_init(void) |
| 166 | { |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 167 | return subsys_system_register(&s3c2442_subsys, NULL); |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | core_initcall(s3c2442_core_init); |
Rafael J. Wysocki | bb072c3 | 2011-04-22 22:03:21 +0200 | [diff] [blame] | 171 | |
| 172 | |
| 173 | #ifdef CONFIG_PM |
| 174 | static struct sleep_save s3c244x_sleep[] = { |
| 175 | SAVE_ITEM(S3C2440_DSC0), |
| 176 | SAVE_ITEM(S3C2440_DSC1), |
| 177 | SAVE_ITEM(S3C2440_GPJDAT), |
| 178 | SAVE_ITEM(S3C2440_GPJCON), |
| 179 | SAVE_ITEM(S3C2440_GPJUP) |
| 180 | }; |
| 181 | |
| 182 | static int s3c244x_suspend(void) |
| 183 | { |
| 184 | s3c_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep)); |
| 185 | return 0; |
| 186 | } |
| 187 | |
| 188 | static void s3c244x_resume(void) |
| 189 | { |
| 190 | s3c_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep)); |
| 191 | } |
| 192 | #else |
| 193 | #define s3c244x_suspend NULL |
| 194 | #define s3c244x_resume NULL |
| 195 | #endif |
| 196 | |
| 197 | struct syscore_ops s3c244x_pm_syscore_ops = { |
| 198 | .suspend = s3c244x_suspend, |
| 199 | .resume = s3c244x_resume, |
| 200 | }; |
Heiko Stuebner | c1ba544 | 2012-03-01 13:23:32 +0900 | [diff] [blame] | 201 | |
| 202 | void s3c244x_restart(char mode, const char *cmd) |
| 203 | { |
| 204 | if (mode == 's') |
| 205 | soft_restart(0); |
| 206 | |
| 207 | arch_wdt_reset(); |
| 208 | |
| 209 | /* we'll take a jump through zero as a poor second */ |
| 210 | soft_restart(0); |
Kukjin Kim | 48546cc | 2012-03-08 01:48:36 -0800 | [diff] [blame] | 211 | } |