LXR linux/arch/m68knommu/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/types.h>
  15#include <linux/kernel.h>
  16#include <linux/mm.h>
  17#include <linux/interrupt.h>
  18#include <linux/irq.h>
  19
  20#include <asm/setup.h>
  21#include <asm/system.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
  39unsigned long int system_clock;
  40
  41extern QUICC *pquicc;
  42
  43/* TODO  DON"T Hard Code this */
  44/* calculate properly using the right PLL and prescaller */
  45// unsigned int system_clock = 33000000l;
  46extern unsigned long int system_clock; //In kernel setup.c
  47
  48
  49static irqreturn_t hw_tick(int irq, void *dummy)
  50{
  51  /* Reset Timer1 */
  52  /* TSTAT &= 0; */
  53
  54  pquicc->timer_ter1 = 0x0002; /* clear timer event */
  55
  56  return arch_timer_interrupt(irq, dummy);
  57}
  58
  59static struct irqaction m68360_timer_irq = {
  60        .name    = "timer",
  61        .flags   = IRQF_DISABLED | IRQF_TIMER,
  62        .handler = hw_tick,
  63};
  64
  65void hw_timer_init(void)
  66{
  67  unsigned char prescaler;
  68  unsigned short tgcr_save;
  69
  70#if 0
  71  /* Restart mode, Enable int, 32KHz, Enable timer */
  72  TCTL = TCTL_OM | TCTL_IRQEN | TCTL_CLKSOURCE_32KHZ | TCTL_TEN;
  73  /* Set prescaler (Divide 32KHz by 32)*/
  74  TPRER = 31;
  75  /* Set compare register  32Khz / 32 / 10 = 100 */
  76  TCMP = 10;                                                              
  77
  78  request_irq(IRQ_MACHSPEC | 1, timer_routine, IRQ_FLG_LOCK, "timer", NULL);
  79#endif
  80
  81  /* General purpose quicc timers: MC68360UM p7-20 */
  82
  83  /* Set up timer 1 (in [1..4]) to do 100Hz */
  84  tgcr_save = pquicc->timer_tgcr & 0xfff0;
  85  pquicc->timer_tgcr  = tgcr_save; /* stop and reset timer 1 */
  86  /* pquicc->timer_tgcr |= 0x4444; */ /* halt timers when FREEZE (ie bdm freeze) */
  87
  88  prescaler = 8;
  89  pquicc->timer_tmr1 = 0x001a | /* or=1, frr=1, iclk=01b */
  90                           (unsigned short)((prescaler - 1) << 8);
  91    
  92  pquicc->timer_tcn1 = 0x0000; /* initial count */
  93  /* calculate interval for 100Hz based on the _system_clock: */
  94  pquicc->timer_trr1 = (system_clock/ prescaler) / HZ; /* reference count */
  95
  96  pquicc->timer_ter1 = 0x0003; /* clear timer events */
  97
  98  /* enable timer 1 interrupt in CIMR */
  99  setup_irq(CPMVEC_TIMER1, &m68360_timer_irq);
 100
 101  /* Start timer 1: */
 102  tgcr_save = (pquicc->timer_tgcr & 0xfff0) | 0x0001;
 103  pquicc->timer_tgcr  = tgcr_save;
 104}
 105
 106void BSP_gettod (int *yearp, int *monp, int *dayp,
 107                   int *hourp, int *minp, int *secp)
 108{
 109}
 110
 111int BSP_set_clock_mmss(unsigned long nowtime)
 112{
 113#if 0
 114  short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
 115
 116  tod->second1 = real_seconds / 10;
 117  tod->second2 = real_seconds % 10;
 118  tod->minute1 = real_minutes / 10;
 119  tod->minute2 = real_minutes % 10;
 120#endif
 121  return 0;
 122}
 123
 124void BSP_reset (void)
 125{
 126  local_irq_disable();
 127  asm volatile (
 128    "moveal #_start, %a0;\n"
 129    "moveb #0, 0xFFFFF300;\n"
 130    "moveal 0(%a0), %sp;\n"
 131    "moveal 4(%a0), %a0;\n"
 132    "jmp (%a0);\n"
 133    );
 134}
 135
 136unsigned char *scc1_hwaddr;
 137static int errno;
 138
 139#if defined (CONFIG_UCQUICC)
 140_bsc0(char *, getserialnum)
 141_bsc1(unsigned char *, gethwaddr, int, a)
 142_bsc1(char *, getbenv, char *, a)
 143#endif
 144
 145
 146void config_BSP(char *command, int len)
 147{
 148  unsigned char *p;
 149
 150  m360_cpm_reset();
 151
 152  /* Calculate the real system clock value. */
 153  {
 154     unsigned int local_pllcr = (unsigned int)(pquicc->sim_pllcr);
 155     if( local_pllcr & MCU_PREEN ) // If the prescaler is dividing by 128
 156     {
 157         int mf = (int)(pquicc->sim_pllcr & 0x0fff);
 158         system_clock = (OSCILLATOR / 128) * (mf + 1);
 159     }
 160     else
 161     {
 162         int mf = (int)(pquicc->sim_pllcr & 0x0fff);
 163         system_clock = (OSCILLATOR) * (mf + 1);
 164     }
 165  }
 166
 167  printk(KERN_INFO "\n68360 QUICC support (C) 2000 Lineo Inc.\n");
 168
 169#if defined(CONFIG_UCQUICC) && 0
 170  printk(KERN_INFO "uCquicc serial string [%s]\n",getserialnum());
 171  p = scc1_hwaddr = gethwaddr(0);
 172  printk(KERN_INFO "uCquicc hwaddr %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
 173         p[0], p[1], p[2], p[3], p[4], p[5]);
 174
 175  p = getbenv("APPEND");
 176  if (p)
 177    strcpy(p,command);
 178  else
 179    command[0] = 0;
 180#else
 181  scc1_hwaddr = "\00\01\02\03\04\05";
 182#endif
 183 
 184  mach_gettod          = BSP_gettod;
 185  mach_reset           = BSP_reset;
 186}
 187