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 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 39unsigned long int system_clock; 40 41extern 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; 46extern unsigned long int system_clock; //In kernel setup.c 47 48 49static 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 59static struct irqaction m68360_timer_irq = { 60 .name = "timer", 61 .flags = IRQF_DISABLED | IRQF_TIMER, 62 .handler = hw_tick, 63}; 64 65void hw_timer_init(void) 66{ 67 unsigned char prescaler; 68 unsigned short tgcr_save; 69 70 71 /* General purpose quicc timers: MC68360UM p7-20 */ 72 73 /* Set up timer 1 (in [1..4]) to do 100Hz */ 74 tgcr_save = pquicc->timer_tgcr & 0xfff0; 75 pquicc->timer_tgcr = tgcr_save; /* stop and reset timer 1 */ 76 /* pquicc->timer_tgcr |= 0x4444; */ /* halt timers when FREEZE (ie bdm freeze) */ 77 78 prescaler = 8; 79 pquicc->timer_tmr1 = 0x001a | /* or=1, frr=1, iclk=01b */ 80 (unsigned short)((prescaler - 1) << 8); 81 82 pquicc->timer_tcn1 = 0x0000; /* initial count */ 83 /* calculate interval for 100Hz based on the _system_clock: */ 84 pquicc->timer_trr1 = (system_clock/ prescaler) / HZ; /* reference count */ 85 86 pquicc->timer_ter1 = 0x0003; /* clear timer events */ 87 88 /* enable timer 1 interrupt in CIMR */ 89 setup_irq(CPMVEC_TIMER1, &m68360_timer_irq); 90 91 /* Start timer 1: */ 92 tgcr_save = (pquicc->timer_tgcr & 0xfff0) | 0x0001; 93 pquicc->timer_tgcr = tgcr_save; 94} 95 96void BSP_gettod (int *yearp, int *monp, int *dayp, 97 int *hourp, int *minp, int *secp) 98{ 99} 100 101int BSP_set_clock_mmss(unsigned long nowtime) 102{ 103 return 0; 104} 105 106void BSP_reset (void) 107{ 108 local_irq_disable(); 109 asm volatile ( 110 "moveal #_start, %a0;\n" 111 "moveb #0, 0xFFFFF300;\n" 112 "moveal 0(%a0), %sp;\n" 113 "moveal 4(%a0), %a0;\n" 114 "jmp (%a0);\n" 115 ); 116} 117 118unsigned char *scc1_hwaddr; 119static int errno; 120 121#if defined(CONFIG_UCQUICC) 122_bsc0(char *, getserialnum) 123_bsc1(unsigned char *, gethwaddr, int, a) 124_bsc1(char *, getbenv, char *, a) 125#endif 126 127 128void config_BSP(char *command, int len) 129{ 130 unsigned char *p; 131 132 m360_cpm_reset(); 133 134 /* Calculate the real system clock value. */ 135 { 136 unsigned int local_pllcr = (unsigned int)(pquicc->sim_pllcr); 137 if( local_pllcr & MCU_PREEN ) // If the prescaler is dividing by 128 138 { 139 int mf = (int)(pquicc->sim_pllcr & 0x0fff); 140 system_clock = (OSCILLATOR / 128) * (mf + 1); 141 } 142 else 143 { 144 int mf = (int)(pquicc->sim_pllcr & 0x0fff); 145 system_clock = (OSCILLATOR) * (mf + 1); 146 } 147 } 148 149 printk(KERN_INFO "\n68360 QUICC support (C) 2000 Lineo Inc.\n"); 150 151 scc1_hwaddr = "\00\01\02\03\04\05"; 152 153 mach_gettod = BSP_gettod; 154 mach_reset = BSP_reset; 155} 156