Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copytight (C) 1999, 2000, 05 Ralf Baechle (ralf@linux-mips.org) |
| 3 | * Copytight (C) 1999, 2000 Silicon Graphics, Inc. |
| 4 | */ |
| 5 | #include <linux/bcd.h> |
| 6 | #include <linux/init.h> |
| 7 | #include <linux/kernel.h> |
| 8 | #include <linux/sched.h> |
| 9 | #include <linux/interrupt.h> |
| 10 | #include <linux/kernel_stat.h> |
| 11 | #include <linux/param.h> |
| 12 | #include <linux/time.h> |
| 13 | #include <linux/timex.h> |
| 14 | #include <linux/mm.h> |
| 15 | |
| 16 | #include <asm/time.h> |
| 17 | #include <asm/pgtable.h> |
| 18 | #include <asm/sgialib.h> |
| 19 | #include <asm/sn/ioc3.h> |
| 20 | #include <asm/m48t35.h> |
| 21 | #include <asm/sn/klconfig.h> |
| 22 | #include <asm/sn/arch.h> |
| 23 | #include <asm/sn/addrs.h> |
| 24 | #include <asm/sn/sn_private.h> |
| 25 | #include <asm/sn/sn0/ip27.h> |
| 26 | #include <asm/sn/sn0/hub.h> |
| 27 | |
| 28 | /* |
| 29 | * This is a hack; we really need to figure these values out dynamically |
| 30 | * |
| 31 | * Since 800 ns works very well with various HUB frequencies, such as |
| 32 | * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time. |
| 33 | * |
| 34 | * Ralf: which clock rate is used to feed the counter? |
| 35 | */ |
| 36 | #define NSEC_PER_CYCLE 800 |
| 37 | #define CYCLES_PER_SEC (NSEC_PER_SEC/NSEC_PER_CYCLE) |
| 38 | #define CYCLES_PER_JIFFY (CYCLES_PER_SEC/HZ) |
| 39 | |
| 40 | #define TICK_SIZE (tick_nsec / 1000) |
| 41 | |
| 42 | static unsigned long ct_cur[NR_CPUS]; /* What counter should be at next timer irq */ |
| 43 | static long last_rtc_update; /* Last time the rtc clock got updated */ |
| 44 | |
| 45 | extern volatile unsigned long wall_jiffies; |
| 46 | |
| 47 | #if 0 |
| 48 | static int set_rtc_mmss(unsigned long nowtime) |
| 49 | { |
| 50 | int retval = 0; |
| 51 | int real_seconds, real_minutes, cmos_minutes; |
| 52 | struct m48t35_rtc *rtc; |
| 53 | nasid_t nid; |
| 54 | |
| 55 | nid = get_nasid(); |
| 56 | rtc = (struct m48t35_rtc *)(KL_CONFIG_CH_CONS_INFO(nid)->memory_base + |
| 57 | IOC3_BYTEBUS_DEV0); |
| 58 | |
| 59 | rtc->control |= M48T35_RTC_READ; |
| 60 | cmos_minutes = BCD2BIN(rtc->min); |
| 61 | rtc->control &= ~M48T35_RTC_READ; |
| 62 | |
| 63 | /* |
| 64 | * Since we're only adjusting minutes and seconds, don't interfere with |
| 65 | * hour overflow. This avoids messing with unknown time zones but |
| 66 | * requires your RTC not to be off by more than 15 minutes |
| 67 | */ |
| 68 | real_seconds = nowtime % 60; |
| 69 | real_minutes = nowtime / 60; |
| 70 | if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1) |
| 71 | real_minutes += 30; /* correct for half hour time zone */ |
| 72 | real_minutes %= 60; |
| 73 | |
| 74 | if (abs(real_minutes - cmos_minutes) < 30) { |
| 75 | real_seconds = BIN2BCD(real_seconds); |
| 76 | real_minutes = BIN2BCD(real_minutes); |
| 77 | rtc->control |= M48T35_RTC_SET; |
| 78 | rtc->sec = real_seconds; |
| 79 | rtc->min = real_minutes; |
| 80 | rtc->control &= ~M48T35_RTC_SET; |
| 81 | } else { |
| 82 | printk(KERN_WARNING |
| 83 | "set_rtc_mmss: can't update from %d to %d\n", |
| 84 | cmos_minutes, real_minutes); |
| 85 | retval = -1; |
| 86 | } |
| 87 | |
| 88 | return retval; |
| 89 | } |
| 90 | #endif |
| 91 | |
| 92 | void ip27_rt_timer_interrupt(struct pt_regs *regs) |
| 93 | { |
| 94 | int cpu = smp_processor_id(); |
| 95 | int cpuA = cputoslice(cpu) == 0; |
| 96 | int irq = 9; /* XXX Assign number */ |
| 97 | |
| 98 | irq_enter(); |
| 99 | write_seqlock(&xtime_lock); |
| 100 | |
| 101 | again: |
| 102 | LOCAL_HUB_S(cpuA ? PI_RT_PEND_A : PI_RT_PEND_B, 0); /* Ack */ |
| 103 | ct_cur[cpu] += CYCLES_PER_JIFFY; |
| 104 | LOCAL_HUB_S(cpuA ? PI_RT_COMPARE_A : PI_RT_COMPARE_B, ct_cur[cpu]); |
| 105 | |
| 106 | if (LOCAL_HUB_L(PI_RT_COUNT) >= ct_cur[cpu]) |
| 107 | goto again; |
| 108 | |
| 109 | kstat_this_cpu.irqs[irq]++; /* kstat only for bootcpu? */ |
| 110 | |
| 111 | if (cpu == 0) |
| 112 | do_timer(regs); |
| 113 | |
| 114 | update_process_times(user_mode(regs)); |
| 115 | |
| 116 | /* |
| 117 | * If we have an externally synchronized Linux clock, then update |
| 118 | * RTC clock accordingly every ~11 minutes. Set_rtc_mmss() has to be |
| 119 | * called as close as possible to when a second starts. |
| 120 | */ |
john stultz | b149ee2 | 2005-09-06 15:17:46 -0700 | [diff] [blame] | 121 | if (ntp_synced() && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | xtime.tv_sec > last_rtc_update + 660 && |
| 123 | (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 && |
| 124 | (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) { |
| 125 | if (rtc_set_time(xtime.tv_sec) == 0) { |
| 126 | last_rtc_update = xtime.tv_sec; |
| 127 | } else { |
| 128 | last_rtc_update = xtime.tv_sec - 600; |
| 129 | /* do it again in 60 s */ |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | write_sequnlock(&xtime_lock); |
| 134 | irq_exit(); |
| 135 | } |
| 136 | |
| 137 | unsigned long ip27_do_gettimeoffset(void) |
| 138 | { |
| 139 | unsigned long ct_cur1; |
| 140 | ct_cur1 = REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT) + CYCLES_PER_JIFFY; |
| 141 | return (ct_cur1 - ct_cur[0]) * NSEC_PER_CYCLE / 1000; |
| 142 | } |
| 143 | |
| 144 | /* Includes for ioc3_init(). */ |
| 145 | #include <asm/sn/types.h> |
| 146 | #include <asm/sn/sn0/addrs.h> |
| 147 | #include <asm/sn/sn0/hubni.h> |
| 148 | #include <asm/sn/sn0/hubio.h> |
| 149 | #include <asm/pci/bridge.h> |
| 150 | |
| 151 | static __init unsigned long get_m48t35_time(void) |
| 152 | { |
| 153 | unsigned int year, month, date, hour, min, sec; |
| 154 | struct m48t35_rtc *rtc; |
| 155 | nasid_t nid; |
| 156 | |
| 157 | nid = get_nasid(); |
| 158 | rtc = (struct m48t35_rtc *)(KL_CONFIG_CH_CONS_INFO(nid)->memory_base + |
| 159 | IOC3_BYTEBUS_DEV0); |
| 160 | |
| 161 | rtc->control |= M48T35_RTC_READ; |
| 162 | sec = rtc->sec; |
| 163 | min = rtc->min; |
| 164 | hour = rtc->hour; |
| 165 | date = rtc->date; |
| 166 | month = rtc->month; |
| 167 | year = rtc->year; |
| 168 | rtc->control &= ~M48T35_RTC_READ; |
| 169 | |
| 170 | sec = BCD2BIN(sec); |
| 171 | min = BCD2BIN(min); |
| 172 | hour = BCD2BIN(hour); |
| 173 | date = BCD2BIN(date); |
| 174 | month = BCD2BIN(month); |
| 175 | year = BCD2BIN(year); |
| 176 | |
| 177 | year += 1970; |
| 178 | |
| 179 | return mktime(year, month, date, hour, min, sec); |
| 180 | } |
| 181 | |
| 182 | static void ip27_timer_setup(struct irqaction *irq) |
| 183 | { |
| 184 | /* over-write the handler, we use our own way */ |
| 185 | irq->handler = no_action; |
| 186 | |
| 187 | /* setup irqaction */ |
| 188 | // setup_irq(IP27_TIMER_IRQ, irq); /* XXX Can't do this yet. */ |
| 189 | } |
| 190 | |
| 191 | void __init ip27_time_init(void) |
| 192 | { |
| 193 | xtime.tv_sec = get_m48t35_time(); |
| 194 | xtime.tv_nsec = 0; |
| 195 | |
| 196 | do_gettimeoffset = ip27_do_gettimeoffset; |
| 197 | |
| 198 | board_timer_setup = ip27_timer_setup; |
| 199 | } |
| 200 | |
| 201 | void __init cpu_time_init(void) |
| 202 | { |
| 203 | lboard_t *board; |
| 204 | klcpu_t *cpu; |
| 205 | int cpuid; |
| 206 | |
| 207 | /* Don't use ARCS. ARCS is fragile. Klconfig is simple and sane. */ |
| 208 | board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27); |
| 209 | if (!board) |
| 210 | panic("Can't find board info for myself."); |
| 211 | |
| 212 | cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX; |
| 213 | cpu = (klcpu_t *) KLCF_COMP(board, cpuid); |
| 214 | if (!cpu) |
| 215 | panic("No information about myself?"); |
| 216 | |
| 217 | printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed); |
| 218 | |
| 219 | set_c0_status(SRB_TIMOCLK); |
| 220 | } |
| 221 | |
| 222 | void __init hub_rtc_init(cnodeid_t cnode) |
| 223 | { |
| 224 | /* |
| 225 | * We only need to initialize the current node. |
| 226 | * If this is not the current node then it is a cpuless |
| 227 | * node and timeouts will not happen there. |
| 228 | */ |
| 229 | if (get_compact_nodeid() == cnode) { |
| 230 | int cpu = smp_processor_id(); |
| 231 | LOCAL_HUB_S(PI_RT_EN_A, 1); |
| 232 | LOCAL_HUB_S(PI_RT_EN_B, 1); |
| 233 | LOCAL_HUB_S(PI_PROF_EN_A, 0); |
| 234 | LOCAL_HUB_S(PI_PROF_EN_B, 0); |
| 235 | ct_cur[cpu] = CYCLES_PER_JIFFY; |
| 236 | LOCAL_HUB_S(PI_RT_COMPARE_A, ct_cur[cpu]); |
| 237 | LOCAL_HUB_S(PI_RT_COUNT, 0); |
| 238 | LOCAL_HUB_S(PI_RT_PEND_A, 0); |
| 239 | LOCAL_HUB_S(PI_RT_COMPARE_B, ct_cur[cpu]); |
| 240 | LOCAL_HUB_S(PI_RT_COUNT, 0); |
| 241 | LOCAL_HUB_S(PI_RT_PEND_B, 0); |
| 242 | } |
| 243 | } |