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(irq_handler_t handler); 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_max_dma_address = 0x01000000; 84 mach_sched_init = mvme147_sched_init; 85 mach_init_IRQ = mvme147_init_IRQ; 86 mach_hwclk = mvme147_hwclk; 87 mach_reset = mvme147_reset; 88 mach_get_model = mvme147_get_model; 89 90 /* Board type is only set by newer versions of vmelilo/tftplilo */ 91 if (!vme_brdtype) 92 vme_brdtype = VME_TYPE_MVME147; 93 } 94 95 static u64 mvme147_read_clk(struct clocksource *cs); 96 97 static struct clocksource mvme147_clk = { 98 .name = "pcc", 99 .rating = 250, 100 .read = mvme147_read_clk, 101 .mask = CLOCKSOURCE_MASK(32), 102 .flags = CLOCK_SOURCE_IS_CONTINUOUS, 103 }; 104 105 static u32 clk_total; 106 107 #define PCC_TIMER_CLOCK_FREQ 160000 108 #define PCC_TIMER_CYCLES (PCC_TIMER_CLOCK_FREQ / HZ) 109 #define PCC_TIMER_PRELOAD (0x10000 - PCC_TIMER_CYCLES) 110 111 /* Using pcc tick timer 1 */ 112 113 static irqreturn_t mvme147_timer_int (int irq, void *dev_id) 114 { 115 irq_handler_t timer_routine = dev_id; 116 unsigned long flags; 117 118 local_irq_save(flags); 119 m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; 120 m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF; 121 clk_total += PCC_TIMER_CYCLES; 122 timer_routine(0, NULL); 123 local_irq_restore(flags); 124 125 return IRQ_HANDLED; 126 } 127 128 129 void mvme147_sched_init (irq_handler_t timer_routine) 130 { 131 if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER, 132 "timer 1", timer_routine)) 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 = 0x0; /* clear timer */ 139 m147_pcc->t1_cntrl = 0x3; /* start timer */ 140 m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; /* clear pending ints */ 141 m147_pcc->t1_int_cntrl = PCC_INT_ENAB|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 #warning check me! 175 if (!op) { 176 m147_rtc->ctrl = RTC_READ; 177 t->tm_year = bcd2int (m147_rtc->bcd_year); 178 t->tm_mon = bcd2int(m147_rtc->bcd_mth) - 1; 179 t->tm_mday = bcd2int (m147_rtc->bcd_dom); 180 t->tm_hour = bcd2int (m147_rtc->bcd_hr); 181 t->tm_min = bcd2int (m147_rtc->bcd_min); 182 t->tm_sec = bcd2int (m147_rtc->bcd_sec); 183 m147_rtc->ctrl = 0; 184 if (t->tm_year < 70) 185 t->tm_year += 100; 186 } 187 return 0; 188 } 189