arch/arm/mach-ks8695/cpu.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * arch/arm/mach-ks8695/cpu.c
   4  *
   5  * Copyright (C) 2006 Ben Dooks <ben@simtec.co.uk>
   6  * Copyright (C) 2006 Simtec Electronics
   7  *
   8  * KS8695 CPU support
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15
  16 #include <mach/hardware.h>
  17 #include <asm/mach/arch.h>
  18 #include <asm/mach/map.h>
  19
  20 #include "regs-sys.h"
  21 #include <mach/regs-misc.h>
  22
  23
  24 static struct map_desc ks8695_io_desc[] __initdata = {
  25         {
  26                 .virtual        = (unsigned long)KS8695_IO_VA,
  27                 .pfn            = __phys_to_pfn(KS8695_IO_PA),
  28                 .length         = KS8695_IO_SIZE,
  29                 .type           = MT_DEVICE,
  30         }
  31 };
  32
  33 static void __init ks8695_processor_info(void)
  34 {
  35         unsigned long id, rev;
  36
  37         id = __raw_readl(KS8695_MISC_VA + KS8695_DID);
  38         rev = __raw_readl(KS8695_MISC_VA + KS8695_RID);
  39
  40         printk("KS8695 ID=%04lx  SubID=%02lx  Revision=%02lx\n", (id & DID_ID), (rev & RID_SUBID), (rev & RID_REVISION));
  41 }
  42
  43 static unsigned int sysclk[8] = { 125000000, 100000000, 62500000, 50000000, 41700000, 33300000, 31300000, 25000000 };
  44 static unsigned int cpuclk[8] = { 166000000, 166000000, 83000000, 83000000, 55300000, 55300000, 41500000, 41500000 };
  45
  46 static void __init ks8695_clock_info(void)
  47 {
  48         unsigned int scdc = __raw_readl(KS8695_SYS_VA + KS8695_CLKCON) & CLKCON_SCDC;
  49
  50         printk("Clocks: System %u MHz, CPU %u MHz\n",
  51                         sysclk[scdc] / 1000000, cpuclk[scdc] / 1000000);
  52 }
  53
  54 void __init ks8695_map_io(void)
  55 {
  56         iotable_init(ks8695_io_desc, ARRAY_SIZE(ks8695_io_desc));
  57
  58         ks8695_processor_info();
  59         ks8695_clock_info();
  60 }