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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/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 
 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 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 arch_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(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, 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   /* 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 
106 void BSP_gettod (int *yearp, int *monp, int *dayp,
107                    int *hourp, int *minp, int *secp)
108 {
109 }
110 
111 int 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 
124 void 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 
136 unsigned char *scc1_hwaddr;
137 static 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 
146 void 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 = "\0\01\02\03\04\05";
182 #endif
183  
184   mach_gettod          = BSP_gettod;
185   mach_reset           = BSP_reset;
186 }
187 

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