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Linux/arch/m68k/platform/68360/config.c

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  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 = "\0\01\02\03\04\05";
180 #endif
181  
182   mach_reset = BSP_reset;
183 }
184 

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