arch/arm/mach-ks8695/cpu.c

   1 /*
   2  * arch/arm/mach-ks8695/cpu.c
   3  *
   4  * Copyright (C) 2006 Ben Dooks <ben@simtec.co.uk>
   5  * Copyright (C) 2006 Simtec Electronics
   6  *
   7  * KS8695 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 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/io.h>
  28
  29 #include <mach/hardware.h>
  30 #include <asm/mach/arch.h>
  31 #include <asm/mach/map.h>
  32
  33 #include <mach/regs-sys.h>
  34 #include <mach/regs-misc.h>
  35
  36
  37 static struct __initdata map_desc ks8695_io_desc[] = {
  38         {
  39                 .virtual        = KS8695_IO_VA,
  40                 .pfn            = __phys_to_pfn(KS8695_IO_PA),
  41                 .length         = KS8695_IO_SIZE,
  42                 .type           = MT_DEVICE,
  43         }
  44 };
  45
  46 static void __init ks8695_processor_info(void)
  47 {
  48         unsigned long id, rev;
  49
  50         id = __raw_readl(KS8695_MISC_VA + KS8695_DID);
  51         rev = __raw_readl(KS8695_MISC_VA + KS8695_RID);
  52
  53         printk("KS8695 ID=%04lx  SubID=%02lx  Revision=%02lx\n", (id & DID_ID), (rev & RID_SUBID), (rev & RID_REVISION));
  54 }
  55
  56 static unsigned int sysclk[8] = { 125000000, 100000000, 62500000, 50000000, 41700000, 33300000, 31300000, 25000000 };
  57 static unsigned int cpuclk[8] = { 166000000, 166000000, 83000000, 83000000, 55300000, 55300000, 41500000, 41500000 };
  58
  59 static void __init ks8695_clock_info(void)
  60 {
  61         unsigned int scdc = __raw_readl(KS8695_SYS_VA + KS8695_CLKCON) & CLKCON_SCDC;
  62
  63         printk("Clocks: System %u MHz, CPU %u MHz\n",
  64                         sysclk[scdc] / 1000000, cpuclk[scdc] / 1000000);
  65 }
  66
  67 void __init ks8695_map_io(void)
  68 {
  69         iotable_init(ks8695_io_desc, ARRAY_SIZE(ks8695_io_desc));
  70
  71         ks8695_processor_info();
  72         ks8695_clock_info();
  73 }