1 /* 2 * arch/m68k/mvme147/config.c 3 * 4 * Copyright (C) 1996 Dave Frascone [chaos@mindspring.com] 5 * Cloned from Richard Hirst [richard@sleepie.demon.co.uk] 6 * 7 * Based on: 8 * 9 * Copyright (C) 1993 Hamish Macdonald 10 * 11 * This file is subject to the terms and conditions of the GNU General Public 12 * License. See the file README.legal in the main directory of this archive 13 * for more details. 14 */ 15 16 #include <linux/types.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/tty.h> 20 #include <linux/clocksource.h> 21 #include <linux/console.h> 22 #include <linux/linkage.h> 23 #include <linux/init.h> 24 #include <linux/major.h> 25 #include <linux/genhd.h> 26 #include <linux/rtc.h> 27 #include <linux/interrupt.h> 28 29 #include <asm/bootinfo.h> 30 #include <asm/bootinfo-vme.h> 31 #include <asm/byteorder.h> 32 #include <asm/setup.h> 33 #include <asm/irq.h> 34 #include <asm/traps.h> 35 #include <asm/machdep.h> 36 #include <asm/mvme147hw.h> 37 38 39 static void mvme147_get_model(char *model); 40 extern void mvme147_sched_init(void); 41 extern int mvme147_hwclk (int, struct rtc_time *); 42 extern void mvme147_reset (void); 43 44 45 static int bcd2int (unsigned char b); 46 47 48 int __init mvme147_parse_bootinfo(const struct bi_record *bi) 49 { 50 uint16_t tag = be16_to_cpu(bi->tag); 51 if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO) 52 return 0; 53 else 54 return 1; 55 } 56 57 void mvme147_reset(void) 58 { 59 pr_info("\r\n\nCalled mvme147_reset\r\n"); 60 m147_pcc->watchdog = 0x0a; /* Clear timer */ 61 m147_pcc->watchdog = 0xa5; /* Enable watchdog - 100ms to reset */ 62 while (1) 63 ; 64 } 65 66 static void mvme147_get_model(char *model) 67 { 68 sprintf(model, "Motorola MVME147"); 69 } 70 71 /* 72 * This function is called during kernel startup to initialize 73 * the mvme147 IRQ handling routines. 74 */ 75 76 void __init mvme147_init_IRQ(void) 77 { 78 m68k_setup_user_interrupt(VEC_USER, 192); 79 } 80 81 void __init config_mvme147(void) 82 { 83 mach_sched_init = mvme147_sched_init; 84 mach_init_IRQ = mvme147_init_IRQ; 85 mach_hwclk = mvme147_hwclk; 86 mach_reset = mvme147_reset; 87 mach_get_model = mvme147_get_model; 88 89 /* Board type is only set by newer versions of vmelilo/tftplilo */ 90 if (!vme_brdtype) 91 vme_brdtype = VME_TYPE_MVME147; 92 } 93 94 static u64 mvme147_read_clk(struct clocksource *cs); 95 96 static struct clocksource mvme147_clk = { 97 .name = "pcc", 98 .rating = 250, 99 .read = mvme147_read_clk, 100 .mask = CLOCKSOURCE_MASK(32), 101 .flags = CLOCK_SOURCE_IS_CONTINUOUS, 102 }; 103 104 static u32 clk_total; 105 106 #define PCC_TIMER_CLOCK_FREQ 160000 107 #define PCC_TIMER_CYCLES (PCC_TIMER_CLOCK_FREQ / HZ) 108 #define PCC_TIMER_PRELOAD (0x10000 - PCC_TIMER_CYCLES) 109 110 /* Using pcc tick timer 1 */ 111 112 static irqreturn_t mvme147_timer_int (int irq, void *dev_id) 113 { 114 unsigned long flags; 115 116 local_irq_save(flags); 117 m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN | 118 PCC_TIMER_TIC_EN; 119 m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR | 120 PCC_LEVEL_TIMER1; 121 clk_total += PCC_TIMER_CYCLES; 122 legacy_timer_tick(1); 123 local_irq_restore(flags); 124 125 return IRQ_HANDLED; 126 } 127 128 129 void mvme147_sched_init (void) 130 { 131 if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER, 132 "timer 1", NULL)) 133 pr_err("Couldn't register timer interrupt\n"); 134 135 /* Init the clock with a value */ 136 /* The clock counter increments until 0xFFFF then reloads */ 137 m147_pcc->t1_preload = PCC_TIMER_PRELOAD; 138 m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN | 139 PCC_TIMER_TIC_EN; 140 m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR | 141 PCC_LEVEL_TIMER1; 142 143 clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ); 144 } 145 146 static u64 mvme147_read_clk(struct clocksource *cs) 147 { 148 unsigned long flags; 149 u8 overflow, tmp; 150 u16 count; 151 u32 ticks; 152 153 local_irq_save(flags); 154 tmp = m147_pcc->t1_cntrl >> 4; 155 count = m147_pcc->t1_count; 156 overflow = m147_pcc->t1_cntrl >> 4; 157 if (overflow != tmp) 158 count = m147_pcc->t1_count; 159 count -= PCC_TIMER_PRELOAD; 160 ticks = count + overflow * PCC_TIMER_CYCLES; 161 ticks += clk_total; 162 local_irq_restore(flags); 163 164 return ticks; 165 } 166 167 static int bcd2int (unsigned char b) 168 { 169 return ((b>>4)*10 + (b&15)); 170 } 171 172 int mvme147_hwclk(int op, struct rtc_time *t) 173 { 174 if (!op) { 175 m147_rtc->ctrl = RTC_READ; 176 t->tm_year = bcd2int (m147_rtc->bcd_year); 177 t->tm_mon = bcd2int(m147_rtc->bcd_mth) - 1; 178 t->tm_mday = bcd2int (m147_rtc->bcd_dom); 179 t->tm_hour = bcd2int (m147_rtc->bcd_hr); 180 t->tm_min = bcd2int (m147_rtc->bcd_min); 181 t->tm_sec = bcd2int (m147_rtc->bcd_sec); 182 m147_rtc->ctrl = 0; 183 if (t->tm_year < 70) 184 t->tm_year += 100; 185 } else { 186 /* FIXME Setting the time is not yet supported */ 187 return -EOPNOTSUPP; 188 } 189 return 0; 190 } 191