LXR linux/arch/m68k/platform/68360/config.c

   1/*
   2 *  linux/arch/m68knommu/platform/68360/config.c
   3 *
   4 *  Copyright (c) 2000 Michael Leslie <mleslie@lineo.com>
   5 *  Copyright (C) 1993 Hamish Macdonald
   6 *  Copyright (C) 1999 D. Jeff Dionne <jeff@uclinux.org>
   7 *
   8 * This file is subject to the terms and conditions of the GNU General Public
   9 * License.  See the file COPYING in the main directory of this archive
  10 * for more details.
  11 */
  12
  13#include <stdarg.h>
  14#include <linux/init.h>
  15#include <linux/types.h>
  16#include <linux/kernel.h>
  17#include <linux/mm.h>
  18#include <linux/interrupt.h>
  19#include <linux/irq.h>
  20
  21#include <asm/setup.h>
  22#include <asm/pgtable.h>
  23#include <asm/machdep.h>
  24#include <asm/m68360.h>
  25
  26#ifdef CONFIG_UCQUICC
  27#include <asm/bootstd.h>
  28#endif
  29
  30extern void m360_cpm_reset(void);
  31
  32// Mask to select if the PLL prescaler is enabled.
  33#define MCU_PREEN   ((unsigned short)(0x0001 << 13))
  34
  35#if defined(CONFIG_UCQUICC)
  36#define OSCILLATOR  (unsigned long int)33000000
  37#endif
  38
  39static irq_handler_t timer_interrupt;
  40unsigned long int system_clock;
  41
  42extern QUICC *pquicc;
  43
  44/* TODO  DON"T Hard Code this */
  45/* calculate properly using the right PLL and prescaller */
  46// unsigned int system_clock = 33000000l;
  47extern unsigned long int system_clock; //In kernel setup.c
  48
  49
  50static irqreturn_t hw_tick(int irq, void *dummy)
  51{
  52  /* Reset Timer1 */
  53  /* TSTAT &= 0; */
  54
  55  pquicc->timer_ter1 = 0x0002; /* clear timer event */
  56
  57  return timer_interrupt(irq, dummy);
  58}
  59
  60static struct irqaction m68360_timer_irq = {
  61        .name    = "timer",
  62        .flags   = IRQF_DISABLED | IRQF_TIMER,
  63        .handler = hw_tick,
  64};
  65
  66void hw_timer_init(irq_handler_t handler)
  67{
  68  unsigned char prescaler;
  69  unsigned short tgcr_save;
  70
  71#if 0
  72  /* Restart mode, Enable int, 32KHz, Enable timer */
  73  TCTL = TCTL_OM | TCTL_IRQEN | TCTL_CLKSOURCE_32KHZ | TCTL_TEN;
  74  /* Set prescaler (Divide 32KHz by 32)*/
  75  TPRER = 31;
  76  /* Set compare register  32Khz / 32 / 10 = 100 */
  77  TCMP = 10;                                                              
  78
  79  request_irq(IRQ_MACHSPEC | 1, timer_routine, 0, "timer", NULL);
  80#endif
  81
  82  /* General purpose quicc timers: MC68360UM p7-20 */
  83
  84  /* Set up timer 1 (in [1..4]) to do 100Hz */
  85  tgcr_save = pquicc->timer_tgcr & 0xfff0;
  86  pquicc->timer_tgcr  = tgcr_save; /* stop and reset timer 1 */
  87  /* pquicc->timer_tgcr |= 0x4444; */ /* halt timers when FREEZE (ie bdm freeze) */
  88
  89  prescaler = 8;
  90  pquicc->timer_tmr1 = 0x001a | /* or=1, frr=1, iclk=01b */
  91                           (unsigned short)((prescaler - 1) << 8);
  92    
  93  pquicc->timer_tcn1 = 0x0000; /* initial count */
  94  /* calculate interval for 100Hz based on the _system_clock: */
  95  pquicc->timer_trr1 = (system_clock/ prescaler) / HZ; /* reference count */
  96
  97  pquicc->timer_ter1 = 0x0003; /* clear timer events */
  98
  99  timer_interrupt = handler;
 100
 101  /* enable timer 1 interrupt in CIMR */
 102  setup_irq(CPMVEC_TIMER1, &m68360_timer_irq);
 103
 104  /* Start timer 1: */
 105  tgcr_save = (pquicc->timer_tgcr & 0xfff0) | 0x0001;
 106  pquicc->timer_tgcr  = tgcr_save;
 107}
 108
 109int BSP_set_clock_mmss(unsigned long nowtime)
 110{
 111#if 0
 112  short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
 113
 114  tod->second1 = real_seconds / 10;
 115  tod->second2 = real_seconds % 10;
 116  tod->minute1 = real_minutes / 10;
 117  tod->minute2 = real_minutes % 10;
 118#endif
 119  return 0;
 120}
 121
 122void BSP_reset (void)
 123{
 124  local_irq_disable();
 125  asm volatile (
 126    "moveal #_start, %a0;\n"
 127    "moveb #0, 0xFFFFF300;\n"
 128    "moveal 0(%a0), %sp;\n"
 129    "moveal 4(%a0), %a0;\n"
 130    "jmp (%a0);\n"
 131    );
 132}
 133
 134unsigned char *scc1_hwaddr;
 135static int errno;
 136
 137#if defined (CONFIG_UCQUICC)
 138_bsc0(char *, getserialnum)
 139_bsc1(unsigned char *, gethwaddr, int, a)
 140_bsc1(char *, getbenv, char *, a)
 141#endif
 142
 143
 144void __init config_BSP(char *command, int len)
 145{
 146  unsigned char *p;
 147
 148  m360_cpm_reset();
 149
 150  /* Calculate the real system clock value. */
 151  {
 152     unsigned int local_pllcr = (unsigned int)(pquicc->sim_pllcr);
 153     if( local_pllcr & MCU_PREEN ) // If the prescaler is dividing by 128
 154     {
 155         int mf = (int)(pquicc->sim_pllcr & 0x0fff);
 156         system_clock = (OSCILLATOR / 128) * (mf + 1);
 157     }
 158     else
 159     {
 160         int mf = (int)(pquicc->sim_pllcr & 0x0fff);
 161         system_clock = (OSCILLATOR) * (mf + 1);
 162     }
 163  }
 164
 165  printk(KERN_INFO "\n68360 QUICC support (C) 2000 Lineo Inc.\n");
 166
 167#if defined(CONFIG_UCQUICC) && 0
 168  printk(KERN_INFO "uCquicc serial string [%s]\n",getserialnum());
 169  p = scc1_hwaddr = gethwaddr(0);
 170  printk(KERN_INFO "uCquicc hwaddr %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
 171         p[0], p[1], p[2], p[3], p[4], p[5]);
 172
 173  p = getbenv("APPEND");
 174  if (p)
 175    strcpy(p,command);
 176  else
 177    command[0] = 0;
 178#else
 179  scc1_hwaddr = "\00\01\02\03\04\05";
 180#endif
 181 
 182  mach_reset = BSP_reset;
 183}
 184