1/* 2 * config.c - non-mmu 68360 platform initialization code 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 30extern 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 39static irq_handler_t timer_interrupt; 40unsigned long int system_clock; 41 42extern 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; 47extern unsigned long int system_clock; //In kernel setup.c 48 49 50static 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 60static struct irqaction m68360_timer_irq = { 61 .name = "timer", 62 .flags = IRQF_TIMER, 63 .handler = hw_tick, 64}; 65 66void 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 109int 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 122void 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 134unsigned char *scc1_hwaddr; 135static 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 144void __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} 184