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