arch/arm/plat-s3c24xx/cpu.c

   1 /* linux/arch/arm/plat-s3c24xx/cpu.c
   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>
  29 #include <linux/serial_core.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/delay.h>
  32 #include <linux/io.h>
  33
  34 #include <mach/hardware.h>
  35 #include <asm/irq.h>
  36 #include <asm/cacheflush.h>
  37
  38 #include <asm/mach/arch.h>
  39 #include <asm/mach/map.h>
  40
  41 #include <mach/system-reset.h>
  42
  43 #include <mach/regs-gpio.h>
  44 #include <plat/regs-serial.h>
  45
  46 #include <plat/cpu.h>
  47 #include <plat/devs.h>
  48 #include <plat/clock.h>
  49 #include <plat/s3c2410.h>
  50 #include <plat/s3c2412.h>
  51 #include <plat/s3c2416.h>
  52 #include <plat/s3c244x.h>
  53 #include <plat/s3c2443.h>
  54
  55 /* table of supported CPUs */
  56
  57 static const char name_s3c2410[]  = "S3C2410";
  58 static const char name_s3c2412[]  = "S3C2412";
  59 static const char name_s3c2416[]  = "S3C2416/S3C2450";
  60 static const char name_s3c2440[]  = "S3C2440";
  61 static const char name_s3c2442[]  = "S3C2442";
  62 static const char name_s3c2442b[]  = "S3C2442B";
  63 static const char name_s3c2443[]  = "S3C2443";
  64 static const char name_s3c2410a[] = "S3C2410A";
  65 static const char name_s3c2440a[] = "S3C2440A";
  66
  67 static struct cpu_table cpu_ids[] __initdata = {
  68         {
  69                 .idcode         = 0x32410000,
  70                 .idmask         = 0xffffffff,
  71                 .map_io         = s3c2410_map_io,
  72                 .init_clocks    = s3c2410_init_clocks,
  73                 .init_uarts     = s3c2410_init_uarts,
  74                 .init           = s3c2410_init,
  75                 .name           = name_s3c2410
  76         },
  77         {
  78                 .idcode         = 0x32410002,
  79                 .idmask         = 0xffffffff,
  80                 .map_io         = s3c2410_map_io,
  81                 .init_clocks    = s3c2410_init_clocks,
  82                 .init_uarts     = s3c2410_init_uarts,
  83                 .init           = s3c2410a_init,
  84                 .name           = name_s3c2410a
  85         },
  86         {
  87                 .idcode         = 0x32440000,
  88                 .idmask         = 0xffffffff,
  89                 .map_io         = s3c2440_map_io,
  90                 .init_clocks    = s3c244x_init_clocks,
  91                 .init_uarts     = s3c244x_init_uarts,
  92                 .init           = s3c2440_init,
  93                 .name           = name_s3c2440
  94         },
  95         {
  96                 .idcode         = 0x32440001,
  97                 .idmask         = 0xffffffff,
  98                 .map_io         = s3c2440_map_io,
  99                 .init_clocks    = s3c244x_init_clocks,
 100                 .init_uarts     = s3c244x_init_uarts,
 101                 .init           = s3c2440_init,
 102                 .name           = name_s3c2440a
 103         },
 104         {
 105                 .idcode         = 0x32440aaa,
 106                 .idmask         = 0xffffffff,
 107                 .map_io         = s3c2442_map_io,
 108                 .init_clocks    = s3c244x_init_clocks,
 109                 .init_uarts     = s3c244x_init_uarts,
 110                 .init           = s3c2442_init,
 111                 .name           = name_s3c2442
 112         },
 113         {
 114                 .idcode         = 0x32440aab,
 115                 .idmask         = 0xffffffff,
 116                 .map_io         = s3c2442_map_io,
 117                 .init_clocks    = s3c244x_init_clocks,
 118                 .init_uarts     = s3c244x_init_uarts,
 119                 .init           = s3c2442_init,
 120                 .name           = name_s3c2442b
 121         },
 122         {
 123                 .idcode         = 0x32412001,
 124                 .idmask         = 0xffffffff,
 125                 .map_io         = s3c2412_map_io,
 126                 .init_clocks    = s3c2412_init_clocks,
 127                 .init_uarts     = s3c2412_init_uarts,
 128                 .init           = s3c2412_init,
 129                 .name           = name_s3c2412,
 130         },
 131         {                       /* a newer version of the s3c2412 */
 132                 .idcode         = 0x32412003,
 133                 .idmask         = 0xffffffff,
 134                 .map_io         = s3c2412_map_io,
 135                 .init_clocks    = s3c2412_init_clocks,
 136                 .init_uarts     = s3c2412_init_uarts,
 137                 .init           = s3c2412_init,
 138                 .name           = name_s3c2412,
 139         },
 140         {                       /* a strange version of the s3c2416 */
 141                 .idcode         = 0x32450003,
 142                 .idmask         = 0xffffffff,
 143                 .map_io         = s3c2416_map_io,
 144                 .init_clocks    = s3c2416_init_clocks,
 145                 .init_uarts     = s3c2416_init_uarts,
 146                 .init           = s3c2416_init,
 147                 .name           = name_s3c2416,
 148         },
 149         {
 150                 .idcode         = 0x32443001,
 151                 .idmask         = 0xffffffff,
 152                 .map_io         = s3c2443_map_io,
 153                 .init_clocks    = s3c2443_init_clocks,
 154                 .init_uarts     = s3c2443_init_uarts,
 155                 .init           = s3c2443_init,
 156                 .name           = name_s3c2443,
 157         },
 158 };
 159
 160 /* minimal IO mapping */
 161
 162 static struct map_desc s3c_iodesc[] __initdata = {
 163         IODESC_ENT(GPIO),
 164         IODESC_ENT(IRQ),
 165         IODESC_ENT(MEMCTRL),
 166         IODESC_ENT(UART)
 167 };
 168
 169 /* read cpu identificaiton code */
 170
 171 static unsigned long s3c24xx_read_idcode_v5(void)
 172 {
 173 #if defined(CONFIG_CPU_S3C2416)
 174         /* s3c2416 is v5, with S3C24XX_GSTATUS1 instead of S3C2412_GSTATUS1 */
 175
 176         u32 gs = __raw_readl(S3C24XX_GSTATUS1);
 177
 178         /* test for s3c2416 or similar device */
 179         if ((gs >> 16) == 0x3245)
 180                 return gs;
 181 #endif
 182
 183 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
 184         return __raw_readl(S3C2412_GSTATUS1);
 185 #else
 186         return 1UL;     /* don't look like an 2400 */
 187 #endif
 188 }
 189
 190 static unsigned long s3c24xx_read_idcode_v4(void)
 191 {
 192         return __raw_readl(S3C2410_GSTATUS1);
 193 }
 194
 195 /* Hook for arm_pm_restart to ensure we execute the reset code
 196  * with the caches enabled. It seems at least the S3C2440 has a problem
 197  * resetting if there is bus activity interrupted by the reset.
 198  */
 199 static void s3c24xx_pm_restart(char mode, const char *cmd)
 200 {
 201         if (mode != 's') {
 202                 unsigned long flags;
 203
 204                 local_irq_save(flags);
 205                 __cpuc_flush_kern_all();
 206                 __cpuc_flush_user_all();
 207
 208                 arch_reset(mode, cmd);
 209                 local_irq_restore(flags);
 210         }
 211
 212         /* fallback, or unhandled */
 213         arm_machine_restart(mode, cmd);
 214 }
 215
 216 void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
 217 {
 218         unsigned long idcode = 0x0;
 219
 220         /* initialise the io descriptors we need for initialisation */
 221         iotable_init(mach_desc, size);
 222         iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
 223
 224         if (cpu_architecture() >= CPU_ARCH_ARMv5) {
 225                 idcode = s3c24xx_read_idcode_v5();
 226         } else {
 227                 idcode = s3c24xx_read_idcode_v4();
 228         }
 229
 230         arm_pm_restart = s3c24xx_pm_restart;
 231
 232         s3c_init_cpu(idcode, cpu_ids, ARRAY_SIZE(cpu_ids));
 233 }