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
  30 extern 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
  39 static irq_handler_t timer_interrupt;
  40 unsigned long int system_clock;
  41
  42 extern 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;
  47 extern unsigned long int system_clock; //In kernel setup.c
  48
  49
  50 static 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
  60 static struct irqaction m68360_timer_irq = {
  61         .name    = "timer",
  62         .flags   = IRQF_TIMER,
  63         .handler = hw_tick,
  64 };
  65
  66 void 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
 109 int 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
 122 void 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
 134 unsigned char *scc1_hwaddr;
 135 static 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
 144 void __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 }