Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 1 | /* linux/arch/arm/plat-s3c24xx/cpu.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * |
| 3 | * Copyright (c) 2004-2005 Simtec Electronics |
| 4 | * http://www.simtec.co.uk/products/SWLINUX/ |
| 5 | * Ben Dooks <ben@simtec.co.uk> |
| 6 | * |
| 7 | * S3C24XX CPU 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 | |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/ioport.h> |
Ben Dooks | b6d1f54 | 2006-12-17 23:22:26 +0100 | [diff] [blame] | 29 | #include <linux/serial_core.h> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 30 | #include <linux/platform_device.h> |
Ben Dooks | 3c7d9c8 | 2008-04-16 00:15:20 +0100 | [diff] [blame] | 31 | #include <linux/delay.h> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 32 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 34 | #include <mach/hardware.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/irq.h> |
Ben Dooks | 3c7d9c8 | 2008-04-16 00:15:20 +0100 | [diff] [blame] | 36 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <asm/mach/arch.h> |
| 39 | #include <asm/mach/map.h> |
| 40 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 41 | #include <mach/system-reset.h> |
Ben Dooks | 3c7d9c8 | 2008-04-16 00:15:20 +0100 | [diff] [blame] | 42 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 43 | #include <mach/regs-gpio.h> |
Ben Dooks | a2b7ba9 | 2008-10-07 22:26:09 +0100 | [diff] [blame] | 44 | #include <plat/regs-serial.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
Ben Dooks | a2b7ba9 | 2008-10-07 22:26:09 +0100 | [diff] [blame] | 46 | #include <plat/cpu.h> |
| 47 | #include <plat/devs.h> |
Ben Dooks | d5120ae | 2008-10-07 23:09:51 +0100 | [diff] [blame] | 48 | #include <plat/clock.h> |
Ben Dooks | a2b7ba9 | 2008-10-07 22:26:09 +0100 | [diff] [blame] | 49 | #include <plat/s3c2400.h> |
| 50 | #include <plat/s3c2410.h> |
Ben Dooks | d5120ae | 2008-10-07 23:09:51 +0100 | [diff] [blame] | 51 | #include <plat/s3c2412.h> |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 52 | #include "s3c244x.h" |
Ben Dooks | a2b7ba9 | 2008-10-07 22:26:09 +0100 | [diff] [blame] | 53 | #include <plat/s3c2440.h> |
| 54 | #include <plat/s3c2442.h> |
| 55 | #include <plat/s3c2443.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | /* table of supported CPUs */ |
| 58 | |
Lucas Correia Villa Real | 83f755f | 2006-02-01 21:24:24 +0000 | [diff] [blame] | 59 | static const char name_s3c2400[] = "S3C2400"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | static const char name_s3c2410[] = "S3C2410"; |
Ben Dooks | 68d9ab3 | 2006-06-24 21:21:27 +0100 | [diff] [blame] | 61 | static const char name_s3c2412[] = "S3C2412"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | static const char name_s3c2440[] = "S3C2440"; |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 63 | static const char name_s3c2442[] = "S3C2442"; |
Ben Dooks | e4d06e3 | 2007-02-16 12:12:31 +0100 | [diff] [blame] | 64 | static const char name_s3c2443[] = "S3C2443"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | static const char name_s3c2410a[] = "S3C2410A"; |
| 66 | static const char name_s3c2440a[] = "S3C2440A"; |
| 67 | |
| 68 | static struct cpu_table cpu_ids[] __initdata = { |
| 69 | { |
| 70 | .idcode = 0x32410000, |
| 71 | .idmask = 0xffffffff, |
| 72 | .map_io = s3c2410_map_io, |
| 73 | .init_clocks = s3c2410_init_clocks, |
| 74 | .init_uarts = s3c2410_init_uarts, |
| 75 | .init = s3c2410_init, |
| 76 | .name = name_s3c2410 |
| 77 | }, |
| 78 | { |
| 79 | .idcode = 0x32410002, |
| 80 | .idmask = 0xffffffff, |
| 81 | .map_io = s3c2410_map_io, |
| 82 | .init_clocks = s3c2410_init_clocks, |
| 83 | .init_uarts = s3c2410_init_uarts, |
| 84 | .init = s3c2410_init, |
| 85 | .name = name_s3c2410a |
| 86 | }, |
| 87 | { |
| 88 | .idcode = 0x32440000, |
| 89 | .idmask = 0xffffffff, |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 90 | .map_io = s3c244x_map_io, |
| 91 | .init_clocks = s3c244x_init_clocks, |
| 92 | .init_uarts = s3c244x_init_uarts, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | .init = s3c2440_init, |
| 94 | .name = name_s3c2440 |
| 95 | }, |
| 96 | { |
| 97 | .idcode = 0x32440001, |
| 98 | .idmask = 0xffffffff, |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 99 | .map_io = s3c244x_map_io, |
| 100 | .init_clocks = s3c244x_init_clocks, |
| 101 | .init_uarts = s3c244x_init_uarts, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | .init = s3c2440_init, |
| 103 | .name = name_s3c2440a |
Lucas Correia Villa Real | 83f755f | 2006-02-01 21:24:24 +0000 | [diff] [blame] | 104 | }, |
| 105 | { |
Ben Dooks | 96ce238 | 2006-06-18 23:06:41 +0100 | [diff] [blame] | 106 | .idcode = 0x32440aaa, |
| 107 | .idmask = 0xffffffff, |
| 108 | .map_io = s3c244x_map_io, |
| 109 | .init_clocks = s3c244x_init_clocks, |
| 110 | .init_uarts = s3c244x_init_uarts, |
| 111 | .init = s3c2442_init, |
| 112 | .name = name_s3c2442 |
| 113 | }, |
| 114 | { |
Ben Dooks | 68d9ab3 | 2006-06-24 21:21:27 +0100 | [diff] [blame] | 115 | .idcode = 0x32412001, |
| 116 | .idmask = 0xffffffff, |
| 117 | .map_io = s3c2412_map_io, |
| 118 | .init_clocks = s3c2412_init_clocks, |
| 119 | .init_uarts = s3c2412_init_uarts, |
| 120 | .init = s3c2412_init, |
| 121 | .name = name_s3c2412, |
| 122 | }, |
Ben Dooks | d9bc55f | 2006-09-20 20:39:15 +0100 | [diff] [blame] | 123 | { /* a newer version of the s3c2412 */ |
| 124 | .idcode = 0x32412003, |
| 125 | .idmask = 0xffffffff, |
| 126 | .map_io = s3c2412_map_io, |
| 127 | .init_clocks = s3c2412_init_clocks, |
| 128 | .init_uarts = s3c2412_init_uarts, |
| 129 | .init = s3c2412_init, |
| 130 | .name = name_s3c2412, |
| 131 | }, |
Ben Dooks | 68d9ab3 | 2006-06-24 21:21:27 +0100 | [diff] [blame] | 132 | { |
Ben Dooks | e4d06e3 | 2007-02-16 12:12:31 +0100 | [diff] [blame] | 133 | .idcode = 0x32443001, |
| 134 | .idmask = 0xffffffff, |
| 135 | .map_io = s3c2443_map_io, |
| 136 | .init_clocks = s3c2443_init_clocks, |
| 137 | .init_uarts = s3c2443_init_uarts, |
| 138 | .init = s3c2443_init, |
| 139 | .name = name_s3c2443, |
| 140 | }, |
| 141 | { |
Lucas Correia Villa Real | 83f755f | 2006-02-01 21:24:24 +0000 | [diff] [blame] | 142 | .idcode = 0x0, /* S3C2400 doesn't have an idcode */ |
| 143 | .idmask = 0xffffffff, |
| 144 | .map_io = s3c2400_map_io, |
| 145 | .init_clocks = s3c2400_init_clocks, |
| 146 | .init_uarts = s3c2400_init_uarts, |
| 147 | .init = s3c2400_init, |
| 148 | .name = name_s3c2400 |
| 149 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | }; |
| 151 | |
| 152 | /* minimal IO mapping */ |
| 153 | |
| 154 | static struct map_desc s3c_iodesc[] __initdata = { |
| 155 | IODESC_ENT(GPIO), |
| 156 | IODESC_ENT(IRQ), |
| 157 | IODESC_ENT(MEMCTRL), |
| 158 | IODESC_ENT(UART) |
| 159 | }; |
| 160 | |
Ben Dooks | 74b265d | 2008-10-21 14:06:31 +0100 | [diff] [blame] | 161 | /* read cpu identificaiton code */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
Ben Dooks | 68d9ab3 | 2006-06-24 21:21:27 +0100 | [diff] [blame] | 163 | static unsigned long s3c24xx_read_idcode_v5(void) |
| 164 | { |
| 165 | #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413) |
| 166 | return __raw_readl(S3C2412_GSTATUS1); |
| 167 | #else |
| 168 | return 1UL; /* don't look like an 2400 */ |
| 169 | #endif |
| 170 | } |
| 171 | |
| 172 | static unsigned long s3c24xx_read_idcode_v4(void) |
| 173 | { |
| 174 | #ifndef CONFIG_CPU_S3C2400 |
| 175 | return __raw_readl(S3C2410_GSTATUS1); |
| 176 | #else |
| 177 | return 0UL; |
| 178 | #endif |
| 179 | } |
| 180 | |
Ben Dooks | 3c7d9c8 | 2008-04-16 00:15:20 +0100 | [diff] [blame] | 181 | /* Hook for arm_pm_restart to ensure we execute the reset code |
| 182 | * with the caches enabled. It seems at least the S3C2440 has a problem |
| 183 | * resetting if there is bus activity interrupted by the reset. |
| 184 | */ |
| 185 | static void s3c24xx_pm_restart(char mode) |
| 186 | { |
| 187 | if (mode != 's') { |
| 188 | unsigned long flags; |
| 189 | |
| 190 | local_irq_save(flags); |
| 191 | __cpuc_flush_kern_all(); |
| 192 | __cpuc_flush_user_all(); |
| 193 | |
| 194 | arch_reset(mode); |
| 195 | local_irq_restore(flags); |
| 196 | } |
| 197 | |
| 198 | /* fallback, or unhandled */ |
| 199 | arm_machine_restart(mode); |
| 200 | } |
| 201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | void __init s3c24xx_init_io(struct map_desc *mach_desc, int size) |
| 203 | { |
Lucas Correia Villa Real | 83f755f | 2006-02-01 21:24:24 +0000 | [diff] [blame] | 204 | unsigned long idcode = 0x0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
| 206 | /* initialise the io descriptors we need for initialisation */ |
Ben Dooks | 74b265d | 2008-10-21 14:06:31 +0100 | [diff] [blame] | 207 | iotable_init(mach_desc, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc)); |
| 209 | |
Ben Dooks | 68d9ab3 | 2006-06-24 21:21:27 +0100 | [diff] [blame] | 210 | if (cpu_architecture() >= CPU_ARCH_ARMv5) { |
| 211 | idcode = s3c24xx_read_idcode_v5(); |
| 212 | } else { |
| 213 | idcode = s3c24xx_read_idcode_v4(); |
| 214 | } |
Lucas Correia Villa Real | 83f755f | 2006-02-01 21:24:24 +0000 | [diff] [blame] | 215 | |
Ben Dooks | 3c7d9c8 | 2008-04-16 00:15:20 +0100 | [diff] [blame] | 216 | arm_pm_restart = s3c24xx_pm_restart; |
| 217 | |
Ben Dooks | 74b265d | 2008-10-21 14:06:31 +0100 | [diff] [blame] | 218 | s3c_init_cpu(idcode, cpu_ids, ARRAY_SIZE(cpu_ids)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | } |