Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Ralf Baechle | 54d0a21 | 2006-07-09 21:38:56 +0100 | [diff] [blame] | 2 | * Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * Copytight (C) 1999, 2000 Silicon Graphics, Inc. |
| 4 | */ |
| 5 | #include <linux/bcd.h> |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 6 | #include <linux/clockchips.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | #include <linux/init.h> |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/sched.h> |
| 10 | #include <linux/interrupt.h> |
| 11 | #include <linux/kernel_stat.h> |
| 12 | #include <linux/param.h> |
| 13 | #include <linux/time.h> |
| 14 | #include <linux/timex.h> |
| 15 | #include <linux/mm.h> |
| 16 | |
| 17 | #include <asm/time.h> |
| 18 | #include <asm/pgtable.h> |
| 19 | #include <asm/sgialib.h> |
| 20 | #include <asm/sn/ioc3.h> |
| 21 | #include <asm/m48t35.h> |
| 22 | #include <asm/sn/klconfig.h> |
| 23 | #include <asm/sn/arch.h> |
| 24 | #include <asm/sn/addrs.h> |
| 25 | #include <asm/sn/sn_private.h> |
| 26 | #include <asm/sn/sn0/ip27.h> |
| 27 | #include <asm/sn/sn0/hub.h> |
| 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #define TICK_SIZE (tick_nsec / 1000) |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #if 0 |
| 32 | static int set_rtc_mmss(unsigned long nowtime) |
| 33 | { |
| 34 | int retval = 0; |
| 35 | int real_seconds, real_minutes, cmos_minutes; |
| 36 | struct m48t35_rtc *rtc; |
| 37 | nasid_t nid; |
| 38 | |
| 39 | nid = get_nasid(); |
| 40 | rtc = (struct m48t35_rtc *)(KL_CONFIG_CH_CONS_INFO(nid)->memory_base + |
| 41 | IOC3_BYTEBUS_DEV0); |
| 42 | |
| 43 | rtc->control |= M48T35_RTC_READ; |
| 44 | cmos_minutes = BCD2BIN(rtc->min); |
| 45 | rtc->control &= ~M48T35_RTC_READ; |
| 46 | |
| 47 | /* |
| 48 | * Since we're only adjusting minutes and seconds, don't interfere with |
| 49 | * hour overflow. This avoids messing with unknown time zones but |
| 50 | * requires your RTC not to be off by more than 15 minutes |
| 51 | */ |
| 52 | real_seconds = nowtime % 60; |
| 53 | real_minutes = nowtime / 60; |
| 54 | if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1) |
| 55 | real_minutes += 30; /* correct for half hour time zone */ |
| 56 | real_minutes %= 60; |
| 57 | |
| 58 | if (abs(real_minutes - cmos_minutes) < 30) { |
| 59 | real_seconds = BIN2BCD(real_seconds); |
| 60 | real_minutes = BIN2BCD(real_minutes); |
| 61 | rtc->control |= M48T35_RTC_SET; |
| 62 | rtc->sec = real_seconds; |
| 63 | rtc->min = real_minutes; |
| 64 | rtc->control &= ~M48T35_RTC_SET; |
| 65 | } else { |
| 66 | printk(KERN_WARNING |
| 67 | "set_rtc_mmss: can't update from %d to %d\n", |
| 68 | cmos_minutes, real_minutes); |
| 69 | retval = -1; |
| 70 | } |
| 71 | |
| 72 | return retval; |
| 73 | } |
| 74 | #endif |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | /* Includes for ioc3_init(). */ |
| 77 | #include <asm/sn/types.h> |
| 78 | #include <asm/sn/sn0/addrs.h> |
| 79 | #include <asm/sn/sn0/hubni.h> |
| 80 | #include <asm/sn/sn0/hubio.h> |
| 81 | #include <asm/pci/bridge.h> |
| 82 | |
Ralf Baechle | 4b55048 | 2007-10-11 23:46:08 +0100 | [diff] [blame] | 83 | unsigned long read_persistent_clock(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | { |
| 85 | unsigned int year, month, date, hour, min, sec; |
| 86 | struct m48t35_rtc *rtc; |
| 87 | nasid_t nid; |
| 88 | |
| 89 | nid = get_nasid(); |
| 90 | rtc = (struct m48t35_rtc *)(KL_CONFIG_CH_CONS_INFO(nid)->memory_base + |
| 91 | IOC3_BYTEBUS_DEV0); |
| 92 | |
| 93 | rtc->control |= M48T35_RTC_READ; |
| 94 | sec = rtc->sec; |
| 95 | min = rtc->min; |
| 96 | hour = rtc->hour; |
| 97 | date = rtc->date; |
| 98 | month = rtc->month; |
| 99 | year = rtc->year; |
| 100 | rtc->control &= ~M48T35_RTC_READ; |
| 101 | |
| 102 | sec = BCD2BIN(sec); |
| 103 | min = BCD2BIN(min); |
| 104 | hour = BCD2BIN(hour); |
| 105 | date = BCD2BIN(date); |
| 106 | month = BCD2BIN(month); |
| 107 | year = BCD2BIN(year); |
| 108 | |
| 109 | year += 1970; |
| 110 | |
| 111 | return mktime(year, month, date, hour, min, sec); |
| 112 | } |
| 113 | |
Ralf Baechle | 3c00944 | 2006-06-16 17:10:49 +0200 | [diff] [blame] | 114 | static void enable_rt_irq(unsigned int irq) |
| 115 | { |
| 116 | } |
| 117 | |
| 118 | static void disable_rt_irq(unsigned int irq) |
| 119 | { |
| 120 | } |
| 121 | |
Ralf Baechle | 94dee17 | 2006-07-02 14:41:42 +0100 | [diff] [blame] | 122 | static struct irq_chip rt_irq_type = { |
Atsushi Nemoto | 70d21cd | 2007-01-15 00:07:25 +0900 | [diff] [blame] | 123 | .name = "SN HUB RT timer", |
Atsushi Nemoto | 1603b5a | 2006-11-02 02:08:36 +0900 | [diff] [blame] | 124 | .ack = disable_rt_irq, |
| 125 | .mask = disable_rt_irq, |
| 126 | .mask_ack = disable_rt_irq, |
| 127 | .unmask = enable_rt_irq, |
Atsushi Nemoto | 1417836 | 2006-11-14 01:13:18 +0900 | [diff] [blame] | 128 | .eoi = enable_rt_irq, |
Ralf Baechle | 3c00944 | 2006-06-16 17:10:49 +0200 | [diff] [blame] | 129 | }; |
| 130 | |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 131 | static int rt_next_event(unsigned long delta, struct clock_event_device *evt) |
| 132 | { |
| 133 | unsigned int cpu = smp_processor_id(); |
Ralf Baechle | c892529 | 2007-11-01 12:20:51 +0000 | [diff] [blame] | 134 | int slice = cputoslice(cpu); |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 135 | unsigned long cnt; |
| 136 | |
| 137 | cnt = LOCAL_HUB_L(PI_RT_COUNT); |
| 138 | cnt += delta; |
Ralf Baechle | 725d7b36 | 2007-10-28 23:02:37 +0000 | [diff] [blame] | 139 | LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt); |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 140 | |
| 141 | return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0; |
| 142 | } |
| 143 | |
| 144 | static void rt_set_mode(enum clock_event_mode mode, |
| 145 | struct clock_event_device *evt) |
| 146 | { |
| 147 | switch (mode) { |
| 148 | case CLOCK_EVT_MODE_ONESHOT: |
| 149 | /* The only mode supported */ |
| 150 | break; |
| 151 | |
| 152 | case CLOCK_EVT_MODE_PERIODIC: |
| 153 | case CLOCK_EVT_MODE_UNUSED: |
| 154 | case CLOCK_EVT_MODE_SHUTDOWN: |
| 155 | case CLOCK_EVT_MODE_RESUME: |
| 156 | /* Nothing to do */ |
| 157 | break; |
| 158 | } |
| 159 | } |
| 160 | |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 161 | unsigned int rt_timer_irq; |
| 162 | |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 163 | static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id) |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 164 | { |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 165 | struct clock_event_device *cd = dev_id; |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 166 | unsigned int cpu = smp_processor_id(); |
Ralf Baechle | 725d7b36 | 2007-10-28 23:02:37 +0000 | [diff] [blame] | 167 | int slice = cputoslice(cpu); |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 168 | |
Ralf Baechle | 725d7b36 | 2007-10-28 23:02:37 +0000 | [diff] [blame] | 169 | /* |
| 170 | * Ack |
| 171 | */ |
Ralf Baechle | c892529 | 2007-11-01 12:20:51 +0000 | [diff] [blame] | 172 | LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0); |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 173 | cd->event_handler(cd); |
| 174 | |
| 175 | return IRQ_HANDLED; |
| 176 | } |
| 177 | |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 178 | struct irqaction hub_rt_irqaction = { |
| 179 | .handler = hub_rt_counter_handler, |
| 180 | .flags = IRQF_DISABLED | IRQF_PERCPU, |
| 181 | .name = "hub-rt", |
Ralf Baechle | 3c00944 | 2006-06-16 17:10:49 +0200 | [diff] [blame] | 182 | }; |
| 183 | |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 184 | /* |
| 185 | * This is a hack; we really need to figure these values out dynamically |
| 186 | * |
| 187 | * Since 800 ns works very well with various HUB frequencies, such as |
| 188 | * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time. |
| 189 | * |
| 190 | * Ralf: which clock rate is used to feed the counter? |
| 191 | */ |
| 192 | #define NSEC_PER_CYCLE 800 |
| 193 | #define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE) |
Ralf Baechle | 3c00944 | 2006-06-16 17:10:49 +0200 | [diff] [blame] | 194 | |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 195 | static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent); |
| 196 | static DEFINE_PER_CPU(char [11], hub_rt_name); |
| 197 | |
| 198 | static void __cpuinit hub_rt_clock_event_init(void) |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 199 | { |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 200 | unsigned int cpu = smp_processor_id(); |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 201 | struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu); |
| 202 | unsigned char *name = per_cpu(hub_rt_name, cpu); |
| 203 | int irq = rt_timer_irq; |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 204 | |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 205 | sprintf(name, "hub-rt %d", cpu); |
| 206 | cd->name = "HUB-RT", |
| 207 | cd->features = CLOCK_EVT_FEAT_ONESHOT, |
| 208 | clockevent_set_clock(cd, CYCLES_PER_SEC); |
| 209 | cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd); |
| 210 | cd->min_delta_ns = clockevent_delta2ns(0x300, cd); |
| 211 | cd->rating = 200, |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 212 | cd->irq = irq, |
| 213 | cd->cpumask = cpumask_of_cpu(cpu), |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 214 | cd->rating = 300, |
| 215 | cd->set_next_event = rt_next_event, |
| 216 | cd->set_mode = rt_set_mode, |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 217 | clockevents_register_device(cd); |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | static void __init hub_rt_clock_event_global_init(void) |
| 221 | { |
| 222 | unsigned int irq; |
| 223 | |
| 224 | do { |
| 225 | smp_wmb(); |
| 226 | irq = rt_timer_irq; |
| 227 | if (irq) |
| 228 | break; |
| 229 | |
| 230 | irq = allocate_irqno(); |
| 231 | if (irq < 0) |
| 232 | panic("Allocation of irq number for timer failed"); |
| 233 | } while (xchg(&rt_timer_irq, irq)); |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 234 | |
| 235 | set_irq_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq); |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 236 | setup_irq(irq, &hub_rt_irqaction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
| 238 | |
Ralf Baechle | 87b2335 | 2007-10-11 23:46:10 +0100 | [diff] [blame] | 239 | static cycle_t hub_rt_read(void) |
Atsushi Nemoto | 16b7b2a | 2006-10-24 00:21:27 +0900 | [diff] [blame] | 240 | { |
| 241 | return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT); |
| 242 | } |
| 243 | |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 244 | struct clocksource hub_rt_clocksource = { |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 245 | .name = "HUB-RT", |
Ralf Baechle | 87b2335 | 2007-10-11 23:46:10 +0100 | [diff] [blame] | 246 | .rating = 200, |
| 247 | .read = hub_rt_read, |
| 248 | .mask = CLOCKSOURCE_MASK(52), |
Ralf Baechle | 87b2335 | 2007-10-11 23:46:10 +0100 | [diff] [blame] | 249 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| 250 | }; |
| 251 | |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 252 | static void __init hub_rt_clocksource_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | { |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 254 | struct clocksource *cs = &hub_rt_clocksource; |
| 255 | |
| 256 | clocksource_set_clock(cs, CYCLES_PER_SEC); |
| 257 | clocksource_register(cs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
| 259 | |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 260 | void __init plat_time_init(void) |
| 261 | { |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 262 | hub_rt_clocksource_init(); |
| 263 | hub_rt_clock_event_global_init(); |
Ralf Baechle | e887b24 | 2007-10-18 13:34:12 +0100 | [diff] [blame] | 264 | } |
| 265 | |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 266 | void __cpuinit cpu_time_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | { |
| 268 | lboard_t *board; |
| 269 | klcpu_t *cpu; |
| 270 | int cpuid; |
| 271 | |
| 272 | /* Don't use ARCS. ARCS is fragile. Klconfig is simple and sane. */ |
| 273 | board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27); |
| 274 | if (!board) |
| 275 | panic("Can't find board info for myself."); |
| 276 | |
| 277 | cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX; |
| 278 | cpu = (klcpu_t *) KLCF_COMP(board, cpuid); |
| 279 | if (!cpu) |
| 280 | panic("No information about myself?"); |
| 281 | |
| 282 | printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed); |
| 283 | |
Ralf Baechle | 06d428d | 2007-10-22 10:34:13 +0100 | [diff] [blame] | 284 | hub_rt_clock_event_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | set_c0_status(SRB_TIMOCLK); |
| 286 | } |
| 287 | |
| 288 | void __init hub_rtc_init(cnodeid_t cnode) |
| 289 | { |
| 290 | /* |
| 291 | * We only need to initialize the current node. |
| 292 | * If this is not the current node then it is a cpuless |
| 293 | * node and timeouts will not happen there. |
| 294 | */ |
| 295 | if (get_compact_nodeid() == cnode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | LOCAL_HUB_S(PI_RT_EN_A, 1); |
| 297 | LOCAL_HUB_S(PI_RT_EN_B, 1); |
| 298 | LOCAL_HUB_S(PI_PROF_EN_A, 0); |
| 299 | LOCAL_HUB_S(PI_PROF_EN_B, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | LOCAL_HUB_S(PI_RT_COUNT, 0); |
| 301 | LOCAL_HUB_S(PI_RT_PEND_A, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | LOCAL_HUB_S(PI_RT_PEND_B, 0); |
| 303 | } |
| 304 | } |