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
  29 extern 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
  38 static irq_handler_t timer_interrupt;
  39 unsigned long int system_clock;
  40
  41 extern 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;
  46 extern unsigned long int system_clock; //In kernel setup.c
  47
  48
  49 static 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 timer_interrupt(irq, dummy);
  57 }
  58
  59 static struct irqaction m68360_timer_irq = {
  60         .name    = "timer",
  61         .flags   = IRQF_DISABLED | IRQF_TIMER,
  62         .handler = hw_tick,
  63 };
  64
  65 void hw_timer_init(irq_handler_t handler)
  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, 0, "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   timer_interrupt = handler;
  99
 100   /* enable timer 1 interrupt in CIMR */
 101   setup_irq(CPMVEC_TIMER1, &m68360_timer_irq);
 102
 103   /* Start timer 1: */
 104   tgcr_save = (pquicc->timer_tgcr & 0xfff0) | 0x0001;
 105   pquicc->timer_tgcr  = tgcr_save;
 106 }
 107
 108 int BSP_set_clock_mmss(unsigned long nowtime)
 109 {
 110 #if 0
 111   short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
 112
 113   tod->second1 = real_seconds / 10;
 114   tod->second2 = real_seconds % 10;
 115   tod->minute1 = real_minutes / 10;
 116   tod->minute2 = real_minutes % 10;
 117 #endif
 118   return 0;
 119 }
 120
 121 void BSP_reset (void)
 122 {
 123   local_irq_disable();
 124   asm volatile (
 125     "moveal #_start, %a0;\n"
 126     "moveb #0, 0xFFFFF300;\n"
 127     "moveal 0(%a0), %sp;\n"
 128     "moveal 4(%a0), %a0;\n"
 129     "jmp (%a0);\n"
 130     );
 131 }
 132
 133 unsigned char *scc1_hwaddr;
 134 static int errno;
 135
 136 #if defined (CONFIG_UCQUICC)
 137 _bsc0(char *, getserialnum)
 138 _bsc1(unsigned char *, gethwaddr, int, a)
 139 _bsc1(char *, getbenv, char *, a)
 140 #endif
 141
 142
 143 void config_BSP(char *command, int len)
 144 {
 145   unsigned char *p;
 146
 147   m360_cpm_reset();
 148
 149   /* Calculate the real system clock value. */
 150   {
 151      unsigned int local_pllcr = (unsigned int)(pquicc->sim_pllcr);
 152      if( local_pllcr & MCU_PREEN ) // If the prescaler is dividing by 128
 153      {
 154          int mf = (int)(pquicc->sim_pllcr & 0x0fff);
 155          system_clock = (OSCILLATOR / 128) * (mf + 1);
 156      }
 157      else
 158      {
 159          int mf = (int)(pquicc->sim_pllcr & 0x0fff);
 160          system_clock = (OSCILLATOR) * (mf + 1);
 161      }
 162   }
 163
 164   printk(KERN_INFO "\n68360 QUICC support (C) 2000 Lineo Inc.\n");
 165
 166 #if defined(CONFIG_UCQUICC) && 0
 167   printk(KERN_INFO "uCquicc serial string [%s]\n",getserialnum());
 168   p = scc1_hwaddr = gethwaddr(0);
 169   printk(KERN_INFO "uCquicc hwaddr %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
 170          p[0], p[1], p[2], p[3], p[4], p[5]);
 171
 172   p = getbenv("APPEND");
 173   if (p)
 174     strcpy(p,command);
 175   else
 176     command[0] = 0;
 177 #else
 178   scc1_hwaddr = "\00\01\02\03\04\05";
 179 #endif
 180
 181   mach_reset = BSP_reset;
 182 }