arch/arm/mach-p2001/arch.c

   1 /*
   2  *  linux/arch/arm/mach-p2001/arch.c
   3  *
   4  *  Copyright (C) 2004-2005 Tobias Lorenz
   5  *
   6  *  uClinux kernel startup code for p2001
   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 #include <linux/types.h>
  23 #include <linux/sched.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/types.h>
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/list.h>
  29 #include <linux/device.h>
  30 #include <linux/slab.h>
  31 #include <linux/string.h>
  32 #include <linux/sysdev.h>
  33
  34 #include <asm/hardware.h>
  35 #include <asm/io.h>
  36 #include <asm/irq.h>
  37 #include <asm/setup.h>
  38 #include <asm/sizes.h>
  39 #include <asm/mach-types.h>
  40
  41 #include <asm/mach/arch.h>
  42 #include <asm/mach/irq.h>
  43 #include <asm/mach/map.h>
  44 #include <asm/mach/time.h>
  45
  46 extern void __init p2001_init_irq(void);
  47 extern struct sys_timer p2001_timer;
  48
  49 #ifdef CONFIG_P2001_AUTO_DETECT_SDRAM
  50 /* automatic memory detection (by write tests at each memory banks) */
  51 static void __init p2001_fixup(struct machine_desc *desc, struct tag *tags, char **cmdline, struct meminfo *mi)
  52 {
  53         volatile char *mem_start;       // bank 0
  54         volatile char *mem_end;         // bank n
  55         char mem_wrap;                  // value of bank 0
  56         char mem_err;                   // value of bank n
  57
  58         /* save memstart */
  59         mem_start = (char *) CONFIG_DRAM_BASE;
  60         mem_wrap = *mem_start;
  61
  62         /* search wrap or error position */
  63         for(mem_end = mem_start + SZ_1M; mem_end < (char *) (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE); mem_end += SZ_1M) {
  64                 mem_err = *mem_end;
  65                 (*mem_end)++;
  66                 if (mem_err+1 != *mem_end)
  67                         break;
  68                 if (mem_wrap != *mem_start)
  69                         break;
  70                 *mem_end = mem_err;
  71         }
  72         *mem_end = mem_err;
  73
  74         /* print message */
  75         printk("Auto detected SDRAM: 0x%08x - 0x%08x (size: %dMB)\n",
  76                 (unsigned int) mem_start, (unsigned int) mem_end,
  77                  ((unsigned int) mem_end - (unsigned int) mem_start) / SZ_1M);
  78
  79         /* give values to mm */
  80         mi->nr_banks      = 1;
  81         mi->bank[0].start = (unsigned int) mem_start;
  82         mi->bank[0].size  = (unsigned int) mem_end - (unsigned int) mem_start;
  83         mi->bank[0].node  = 0;
  84 }
  85 #endif
  86
  87 MACHINE_START(P2001, "P2001")
  88         /* Maintainer: Tobias Lorenz <tobias.lorenz@gmx.net> */
  89 #ifdef CONFIG_P2001_AUTO_DETECT_SDRAM
  90         .fixup = p2001_fixup,
  91 #endif
  92         .init_irq = p2001_init_irq,
  93         .timer = &p2001_timer,
  94 MACHINE_END