arch/arm/mach-s3c2410/cpu.c

   1 /* linux/arch/arm/mach-s3c2410/cpu.c
   2  *
   3  * Copyright (c) 2004 Simtec Electronics
   4  * Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * S3C24XX CPU Support
   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 as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 */
  22
  23
  24 #include <linux/init.h>
  25 #include <linux/module.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/ioport.h>
  28 #include <linux/device.h>
  29
  30 #include <asm/hardware.h>
  31 #include <asm/irq.h>
  32 #include <asm/io.h>
  33 #include <asm/delay.h>
  34
  35 #include <asm/mach/arch.h>
  36 #include <asm/mach/map.h>
  37
  38 #include <asm/arch/regs-gpio.h>
  39
  40 #include "cpu.h"
  41 #include "s3c2410.h"
  42 #include "s3c2440.h"
  43
  44 struct cpu_table {
  45         unsigned long   idcode;
  46         unsigned long   idmask;
  47         void            (*map_io)(struct map_desc *mach_desc, int size);
  48         int             (*init)(void);
  49         const char      *name;
  50 };
  51
  52 /* table of supported CPUs */
  53
  54 static const char name_s3c2410[]  = "S3C2410";
  55 static const char name_s3c2440[]  = "S3C2440";
  56 static const char name_s3c2410a[] = "S3C2410A";
  57 static const char name_s3c2440a[] = "S3C2440A";
  58
  59 static struct cpu_table cpu_ids[] __initdata = {
  60         {
  61                 .idcode = 0x32410000,
  62                 .idmask = 0xffffffff,
  63                 .map_io = s3c2410_map_io,
  64                 .init   = s3c2410_init,
  65                 .name   = name_s3c2410
  66         },
  67         {
  68                 .idcode = 0x3241002,
  69                 .idmask = 0xffffffff,
  70                 .map_io = s3c2410_map_io,
  71                 .init   = s3c2410_init,
  72                 .name   = name_s3c2410a
  73         },
  74         {
  75                 .idcode = 0x32440000,
  76                 .idmask = 0xffffffff,
  77                 .map_io = s3c2440_map_io,
  78                 .init   = s3c2440_init,
  79                 .name   = name_s3c2440
  80         },
  81         {
  82                 .idcode = 0x32440001,
  83                 .idmask = 0xffffffff,
  84                 .map_io = s3c2440_map_io,
  85                 .init   = s3c2440_init,
  86                 .name   = name_s3c2440a
  87         }
  88 };
  89
  90 /* minimal IO mapping */
  91
  92 static struct map_desc s3c_iodesc[] __initdata = {
  93         IODESC_ENT(GPIO),
  94         IODESC_ENT(IRQ),
  95         IODESC_ENT(MEMCTRL),
  96         IODESC_ENT(UART)
  97 };
  98
  99
 100 static struct cpu_table *
 101 s3c_lookup_cpu(unsigned long idcode)
 102 {
 103         struct cpu_table *tab;
 104         int count;
 105
 106         tab = cpu_ids;
 107         for (count = 0; count < ARRAY_SIZE(cpu_ids); count++) {
 108                 if ((idcode & tab->idmask) == tab->idcode)
 109                         return tab;
 110         }
 111
 112         return NULL;
 113 }
 114
 115 static struct cpu_table *cpu;
 116
 117 void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
 118 {
 119         unsigned long idcode;
 120
 121         /* initialise the io descriptors we need for initialisation */
 122         iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
 123
 124         idcode = __raw_readl(S3C2410_GSTATUS1);
 125         cpu = s3c_lookup_cpu(idcode);
 126
 127         if (cpu == NULL) {
 128                 printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
 129                 panic("Unknown S3C24XX CPU");
 130         }
 131
 132         if (cpu->map_io == NULL || cpu->init == NULL) {
 133                 printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
 134                 panic("Unsupported S3C24XX CPU");
 135         }
 136
 137         printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
 138
 139         (cpu->map_io)(mach_desc, size);
 140 }
 141
 142 static int __init s3c_arch_init(void)
 143 {
 144         // do the correct init for cpu
 145
 146         if (cpu == NULL)
 147                 panic("s3c_arch_init: NULL cpu\n");
 148
 149         return (cpu->init)();
 150 }
 151
 152 arch_initcall(s3c_arch_init);