Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/s390/kernel/time.c |
| 3 | * Time of day based timer functions. |
| 4 | * |
| 5 | * S390 version |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 6 | * Copyright IBM Corp. 1999, 2008 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * Author(s): Hartmut Penner (hp@de.ibm.com), |
| 8 | * Martin Schwidefsky (schwidefsky@de.ibm.com), |
| 9 | * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
| 10 | * |
| 11 | * Derived from "arch/i386/kernel/time.c" |
| 12 | * Copyright (C) 1991, 1992, 1995 Linus Torvalds |
| 13 | */ |
| 14 | |
Martin Schwidefsky | feab650 | 2008-12-25 13:39:38 +0100 | [diff] [blame] | 15 | #define KMSG_COMPONENT "time" |
| 16 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/errno.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/param.h> |
| 23 | #include <linux/string.h> |
| 24 | #include <linux/mm.h> |
| 25 | #include <linux/interrupt.h> |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 26 | #include <linux/cpu.h> |
| 27 | #include <linux/stop_machine.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/time.h> |
Ralf Baechle | 3367b99 | 2007-05-08 00:27:52 -0700 | [diff] [blame] | 29 | #include <linux/sysdev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/delay.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/smp.h> |
| 33 | #include <linux/types.h> |
| 34 | #include <linux/profile.h> |
| 35 | #include <linux/timex.h> |
| 36 | #include <linux/notifier.h> |
Martin Schwidefsky | dc64bef | 2006-10-06 16:38:48 +0200 | [diff] [blame] | 37 | #include <linux/clocksource.h> |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 38 | #include <linux/clockchips.h> |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 39 | #include <linux/bootmem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <asm/uaccess.h> |
| 41 | #include <asm/delay.h> |
| 42 | #include <asm/s390_ext.h> |
| 43 | #include <asm/div64.h> |
Martin Schwidefsky | b020632 | 2008-12-25 13:38:36 +0100 | [diff] [blame] | 44 | #include <asm/vdso.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <asm/irq.h> |
Heiko Carstens | 5a489b9 | 2006-10-06 16:38:35 +0200 | [diff] [blame] | 46 | #include <asm/irq_regs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <asm/timer.h> |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 48 | #include <asm/etr.h> |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 49 | #include <asm/cio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | /* change this if you have some constant time drift */ |
| 52 | #define USECS_PER_JIFFY ((unsigned long) 1000000/HZ) |
| 53 | #define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12) |
| 54 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 55 | /* The value of the TOD clock for 1.1.1970. */ |
| 56 | #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL |
| 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | /* |
| 59 | * Create a small time difference between the timer interrupts |
| 60 | * on the different cpus to avoid lock contention. |
| 61 | */ |
| 62 | #define CPU_DEVIATION (smp_processor_id() << 12) |
| 63 | |
| 64 | #define TICK_SIZE tick |
| 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | static ext_int_info_t ext_int_info_cc; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 67 | static ext_int_info_t ext_int_etr_cc; |
Christian Borntraeger | 8107d82 | 2008-11-27 11:05:56 +0100 | [diff] [blame] | 68 | static u64 sched_clock_base_cc; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 69 | |
| 70 | static DEFINE_PER_CPU(struct clock_event_device, comparators); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | /* |
| 73 | * Scheduler clock - returns current time in nanosec units. |
| 74 | */ |
| 75 | unsigned long long sched_clock(void) |
| 76 | { |
Christian Borntraeger | 8107d82 | 2008-11-27 11:05:56 +0100 | [diff] [blame] | 77 | return ((get_clock_xt() - sched_clock_base_cc) * 125) >> 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | } |
| 79 | |
Jan Glauber | 32f65f2 | 2006-02-01 03:06:33 -0800 | [diff] [blame] | 80 | /* |
| 81 | * Monotonic_clock - returns # of nanoseconds passed since time_init() |
| 82 | */ |
| 83 | unsigned long long monotonic_clock(void) |
| 84 | { |
| 85 | return sched_clock(); |
| 86 | } |
| 87 | EXPORT_SYMBOL(monotonic_clock); |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | void tod_to_timeval(__u64 todval, struct timespec *xtime) |
| 90 | { |
| 91 | unsigned long long sec; |
| 92 | |
| 93 | sec = todval >> 12; |
| 94 | do_div(sec, 1000000); |
| 95 | xtime->tv_sec = sec; |
| 96 | todval -= (sec * 1000000) << 12; |
| 97 | xtime->tv_nsec = ((todval * 1000) >> 12); |
| 98 | } |
| 99 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | #ifdef CONFIG_PROFILING |
Heiko Carstens | 5a489b9 | 2006-10-06 16:38:35 +0200 | [diff] [blame] | 101 | #define s390_do_profile() profile_tick(CPU_PROFILING) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | #else |
Heiko Carstens | 5a489b9 | 2006-10-06 16:38:35 +0200 | [diff] [blame] | 103 | #define s390_do_profile() do { ; } while(0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | #endif /* CONFIG_PROFILING */ |
| 105 | |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 106 | void clock_comparator_work(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | { |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 108 | struct clock_event_device *cd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 110 | S390_lowcore.clock_comparator = -1ULL; |
| 111 | set_clock_comparator(S390_lowcore.clock_comparator); |
| 112 | cd = &__get_cpu_var(comparators); |
| 113 | cd->event_handler(cd); |
Heiko Carstens | 5a489b9 | 2006-10-06 16:38:35 +0200 | [diff] [blame] | 114 | s390_do_profile(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | } |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | /* |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 118 | * Fixup the clock comparator. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | */ |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 120 | static void fixup_clock_comparator(unsigned long long delta) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 122 | /* If nobody is waiting there's nothing to fix. */ |
| 123 | if (S390_lowcore.clock_comparator == -1ULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | return; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 125 | S390_lowcore.clock_comparator += delta; |
| 126 | set_clock_comparator(S390_lowcore.clock_comparator); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | } |
| 128 | |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 129 | static int s390_next_event(unsigned long delta, |
| 130 | struct clock_event_device *evt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | { |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 132 | S390_lowcore.clock_comparator = get_clock() + delta; |
| 133 | set_clock_comparator(S390_lowcore.clock_comparator); |
| 134 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | } |
| 136 | |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 137 | static void s390_set_mode(enum clock_event_mode mode, |
| 138 | struct clock_event_device *evt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | /* |
| 143 | * Set up lowcore and control register of the current cpu to |
| 144 | * enable TOD clock and clock comparator interrupts. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | */ |
| 146 | void init_cpu_timer(void) |
| 147 | { |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 148 | struct clock_event_device *cd; |
| 149 | int cpu; |
| 150 | |
| 151 | S390_lowcore.clock_comparator = -1ULL; |
| 152 | set_clock_comparator(S390_lowcore.clock_comparator); |
| 153 | |
| 154 | cpu = smp_processor_id(); |
| 155 | cd = &per_cpu(comparators, cpu); |
| 156 | cd->name = "comparator"; |
| 157 | cd->features = CLOCK_EVT_FEAT_ONESHOT; |
| 158 | cd->mult = 16777; |
| 159 | cd->shift = 12; |
| 160 | cd->min_delta_ns = 1; |
| 161 | cd->max_delta_ns = LONG_MAX; |
| 162 | cd->rating = 400; |
Rusty Russell | 320ab2b | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 163 | cd->cpumask = cpumask_of(cpu); |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 164 | cd->set_next_event = s390_next_event; |
| 165 | cd->set_mode = s390_set_mode; |
| 166 | |
| 167 | clockevents_register_device(cd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 169 | /* Enable clock comparator timer interrupt. */ |
| 170 | __ctl_set_bit(0,11); |
| 171 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 172 | /* Always allow the timing alert external interrupt. */ |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 173 | __ctl_set_bit(0, 4); |
| 174 | } |
| 175 | |
| 176 | static void clock_comparator_interrupt(__u16 code) |
| 177 | { |
Heiko Carstens | d3d238c | 2008-10-03 21:54:59 +0200 | [diff] [blame] | 178 | if (S390_lowcore.clock_comparator == -1ULL) |
| 179 | set_clock_comparator(S390_lowcore.clock_comparator); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 180 | } |
| 181 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 182 | static void etr_timing_alert(struct etr_irq_parm *); |
| 183 | static void stp_timing_alert(struct stp_irq_parm *); |
| 184 | |
| 185 | static void timing_alert_interrupt(__u16 code) |
| 186 | { |
| 187 | if (S390_lowcore.ext_params & 0x00c40000) |
| 188 | etr_timing_alert((struct etr_irq_parm *) |
| 189 | &S390_lowcore.ext_params); |
| 190 | if (S390_lowcore.ext_params & 0x00038000) |
| 191 | stp_timing_alert((struct stp_irq_parm *) |
| 192 | &S390_lowcore.ext_params); |
| 193 | } |
| 194 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 195 | static void etr_reset(void); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 196 | static void stp_reset(void); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 197 | |
| 198 | /* |
| 199 | * Get the TOD clock running. |
| 200 | */ |
| 201 | static u64 __init reset_tod_clock(void) |
| 202 | { |
| 203 | u64 time; |
| 204 | |
| 205 | etr_reset(); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 206 | stp_reset(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 207 | if (store_clock(&time) == 0) |
| 208 | return time; |
| 209 | /* TOD clock not running. Set the clock to Unix Epoch. */ |
| 210 | if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0) |
| 211 | panic("TOD clock not operational."); |
| 212 | |
| 213 | return TOD_UNIX_EPOCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
| 215 | |
Martin Schwidefsky | dc64bef | 2006-10-06 16:38:48 +0200 | [diff] [blame] | 216 | static cycle_t read_tod_clock(void) |
| 217 | { |
| 218 | return get_clock(); |
| 219 | } |
| 220 | |
| 221 | static struct clocksource clocksource_tod = { |
| 222 | .name = "tod", |
Christian Borntraeger | d2cb0e6 | 2007-11-05 11:10:14 +0100 | [diff] [blame] | 223 | .rating = 400, |
Martin Schwidefsky | dc64bef | 2006-10-06 16:38:48 +0200 | [diff] [blame] | 224 | .read = read_tod_clock, |
| 225 | .mask = -1ULL, |
| 226 | .mult = 1000, |
| 227 | .shift = 12, |
Thomas Gleixner | cc02d80 | 2007-02-16 01:27:39 -0800 | [diff] [blame] | 228 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
Martin Schwidefsky | dc64bef | 2006-10-06 16:38:48 +0200 | [diff] [blame] | 229 | }; |
| 230 | |
| 231 | |
Martin Schwidefsky | b020632 | 2008-12-25 13:38:36 +0100 | [diff] [blame] | 232 | void update_vsyscall(struct timespec *wall_time, struct clocksource *clock) |
| 233 | { |
| 234 | if (clock != &clocksource_tod) |
| 235 | return; |
| 236 | |
| 237 | /* Make userspace gettimeofday spin until we're done. */ |
| 238 | ++vdso_data->tb_update_count; |
| 239 | smp_wmb(); |
| 240 | vdso_data->xtime_tod_stamp = clock->cycle_last; |
| 241 | vdso_data->xtime_clock_sec = xtime.tv_sec; |
| 242 | vdso_data->xtime_clock_nsec = xtime.tv_nsec; |
| 243 | vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec; |
| 244 | vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec; |
| 245 | smp_wmb(); |
| 246 | ++vdso_data->tb_update_count; |
| 247 | } |
| 248 | |
| 249 | extern struct timezone sys_tz; |
| 250 | |
| 251 | void update_vsyscall_tz(void) |
| 252 | { |
| 253 | /* Make userspace gettimeofday spin until we're done. */ |
| 254 | ++vdso_data->tb_update_count; |
| 255 | smp_wmb(); |
| 256 | vdso_data->tz_minuteswest = sys_tz.tz_minuteswest; |
| 257 | vdso_data->tz_dsttime = sys_tz.tz_dsttime; |
| 258 | smp_wmb(); |
| 259 | ++vdso_data->tb_update_count; |
| 260 | } |
| 261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | /* |
| 263 | * Initialize the TOD clock and the CPU timer of |
| 264 | * the boot cpu. |
| 265 | */ |
| 266 | void __init time_init(void) |
| 267 | { |
Christian Borntraeger | 8107d82 | 2008-11-27 11:05:56 +0100 | [diff] [blame] | 268 | sched_clock_base_cc = reset_tod_clock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
| 270 | /* set xtime */ |
Christian Borntraeger | 8107d82 | 2008-11-27 11:05:56 +0100 | [diff] [blame] | 271 | tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, &xtime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | set_normalized_timespec(&wall_to_monotonic, |
| 273 | -xtime.tv_sec, -xtime.tv_nsec); |
| 274 | |
| 275 | /* request the clock comparator external interrupt */ |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 276 | if (register_early_external_interrupt(0x1004, |
| 277 | clock_comparator_interrupt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | &ext_int_info_cc) != 0) |
| 279 | panic("Couldn't request external interrupt 0x1004"); |
| 280 | |
Martin Schwidefsky | dc64bef | 2006-10-06 16:38:48 +0200 | [diff] [blame] | 281 | if (clocksource_register(&clocksource_tod) != 0) |
| 282 | panic("Could not register TOD clock source"); |
| 283 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 284 | /* request the timing alert external interrupt */ |
| 285 | if (register_early_external_interrupt(0x1406, |
| 286 | timing_alert_interrupt, |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 287 | &ext_int_etr_cc) != 0) |
| 288 | panic("Couldn't request external interrupt 0x1406"); |
| 289 | |
| 290 | /* Enable TOD clock interrupts on the boot cpu. */ |
| 291 | init_cpu_timer(); |
Martin Schwidefsky | c185b78 | 2008-12-25 13:39:25 +0100 | [diff] [blame] | 292 | /* Enable cpu timer interrupts on the boot cpu. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | vtime_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 296 | /* |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 297 | * The time is "clock". old is what we think the time is. |
| 298 | * Adjust the value by a multiple of jiffies and add the delta to ntp. |
| 299 | * "delay" is an approximation how long the synchronization took. If |
| 300 | * the time correction is positive, then "delay" is subtracted from |
| 301 | * the time difference and only the remaining part is passed to ntp. |
| 302 | */ |
| 303 | static unsigned long long adjust_time(unsigned long long old, |
| 304 | unsigned long long clock, |
| 305 | unsigned long long delay) |
| 306 | { |
| 307 | unsigned long long delta, ticks; |
| 308 | struct timex adjust; |
| 309 | |
| 310 | if (clock > old) { |
| 311 | /* It is later than we thought. */ |
| 312 | delta = ticks = clock - old; |
| 313 | delta = ticks = (delta < delay) ? 0 : delta - delay; |
| 314 | delta -= do_div(ticks, CLK_TICKS_PER_JIFFY); |
| 315 | adjust.offset = ticks * (1000000 / HZ); |
| 316 | } else { |
| 317 | /* It is earlier than we thought. */ |
| 318 | delta = ticks = old - clock; |
| 319 | delta -= do_div(ticks, CLK_TICKS_PER_JIFFY); |
| 320 | delta = -delta; |
| 321 | adjust.offset = -ticks * (1000000 / HZ); |
| 322 | } |
Christian Borntraeger | 8107d82 | 2008-11-27 11:05:56 +0100 | [diff] [blame] | 323 | sched_clock_base_cc += delta; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 324 | if (adjust.offset != 0) { |
Martin Schwidefsky | feab650 | 2008-12-25 13:39:38 +0100 | [diff] [blame] | 325 | pr_notice("The ETR interface has adjusted the clock " |
| 326 | "by %li microseconds\n", adjust.offset); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 327 | adjust.modes = ADJ_OFFSET_SINGLESHOT; |
| 328 | do_adjtimex(&adjust); |
| 329 | } |
| 330 | return delta; |
| 331 | } |
| 332 | |
| 333 | static DEFINE_PER_CPU(atomic_t, clock_sync_word); |
| 334 | static unsigned long clock_sync_flags; |
| 335 | |
| 336 | #define CLOCK_SYNC_HAS_ETR 0 |
| 337 | #define CLOCK_SYNC_HAS_STP 1 |
| 338 | #define CLOCK_SYNC_ETR 2 |
| 339 | #define CLOCK_SYNC_STP 3 |
| 340 | |
| 341 | /* |
| 342 | * The synchronous get_clock function. It will write the current clock |
| 343 | * value to the clock pointer and return 0 if the clock is in sync with |
| 344 | * the external time source. If the clock mode is local it will return |
| 345 | * -ENOSYS and -EAGAIN if the clock is not in sync with the external |
| 346 | * reference. |
| 347 | */ |
| 348 | int get_sync_clock(unsigned long long *clock) |
| 349 | { |
| 350 | atomic_t *sw_ptr; |
| 351 | unsigned int sw0, sw1; |
| 352 | |
| 353 | sw_ptr = &get_cpu_var(clock_sync_word); |
| 354 | sw0 = atomic_read(sw_ptr); |
| 355 | *clock = get_clock(); |
| 356 | sw1 = atomic_read(sw_ptr); |
| 357 | put_cpu_var(clock_sync_sync); |
| 358 | if (sw0 == sw1 && (sw0 & 0x80000000U)) |
| 359 | /* Success: time is in sync. */ |
| 360 | return 0; |
| 361 | if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) && |
| 362 | !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags)) |
| 363 | return -ENOSYS; |
| 364 | if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) && |
| 365 | !test_bit(CLOCK_SYNC_STP, &clock_sync_flags)) |
| 366 | return -EACCES; |
| 367 | return -EAGAIN; |
| 368 | } |
| 369 | EXPORT_SYMBOL(get_sync_clock); |
| 370 | |
| 371 | /* |
| 372 | * Make get_sync_clock return -EAGAIN. |
| 373 | */ |
| 374 | static void disable_sync_clock(void *dummy) |
| 375 | { |
| 376 | atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word); |
| 377 | /* |
| 378 | * Clear the in-sync bit 2^31. All get_sync_clock calls will |
| 379 | * fail until the sync bit is turned back on. In addition |
| 380 | * increase the "sequence" counter to avoid the race of an |
| 381 | * etr event and the complete recovery against get_sync_clock. |
| 382 | */ |
| 383 | atomic_clear_mask(0x80000000, sw_ptr); |
| 384 | atomic_inc(sw_ptr); |
| 385 | } |
| 386 | |
| 387 | /* |
| 388 | * Make get_sync_clock return 0 again. |
| 389 | * Needs to be called from a context disabled for preemption. |
| 390 | */ |
| 391 | static void enable_sync_clock(void) |
| 392 | { |
| 393 | atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word); |
| 394 | atomic_set_mask(0x80000000, sw_ptr); |
| 395 | } |
| 396 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 397 | /* Single threaded workqueue used for etr and stp sync events */ |
| 398 | static struct workqueue_struct *time_sync_wq; |
| 399 | |
| 400 | static void __init time_init_wq(void) |
| 401 | { |
Heiko Carstens | 179cb81 | 2009-01-23 16:40:26 +0100 | [diff] [blame^] | 402 | if (time_sync_wq) |
| 403 | return; |
| 404 | time_sync_wq = create_singlethread_workqueue("timesync"); |
| 405 | stop_machine_create(); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 406 | } |
| 407 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 408 | /* |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 409 | * External Time Reference (ETR) code. |
| 410 | */ |
| 411 | static int etr_port0_online; |
| 412 | static int etr_port1_online; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 413 | static int etr_steai_available; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 414 | |
| 415 | static int __init early_parse_etr(char *p) |
| 416 | { |
| 417 | if (strncmp(p, "off", 3) == 0) |
| 418 | etr_port0_online = etr_port1_online = 0; |
| 419 | else if (strncmp(p, "port0", 5) == 0) |
| 420 | etr_port0_online = 1; |
| 421 | else if (strncmp(p, "port1", 5) == 0) |
| 422 | etr_port1_online = 1; |
| 423 | else if (strncmp(p, "on", 2) == 0) |
| 424 | etr_port0_online = etr_port1_online = 1; |
| 425 | return 0; |
| 426 | } |
| 427 | early_param("etr", early_parse_etr); |
| 428 | |
| 429 | enum etr_event { |
| 430 | ETR_EVENT_PORT0_CHANGE, |
| 431 | ETR_EVENT_PORT1_CHANGE, |
| 432 | ETR_EVENT_PORT_ALERT, |
| 433 | ETR_EVENT_SYNC_CHECK, |
| 434 | ETR_EVENT_SWITCH_LOCAL, |
| 435 | ETR_EVENT_UPDATE, |
| 436 | }; |
| 437 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 438 | /* |
| 439 | * Valid bit combinations of the eacr register are (x = don't care): |
| 440 | * e0 e1 dp p0 p1 ea es sl |
| 441 | * 0 0 x 0 0 0 0 0 initial, disabled state |
| 442 | * 0 0 x 0 1 1 0 0 port 1 online |
| 443 | * 0 0 x 1 0 1 0 0 port 0 online |
| 444 | * 0 0 x 1 1 1 0 0 both ports online |
| 445 | * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode |
| 446 | * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode |
| 447 | * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync |
| 448 | * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync |
| 449 | * 0 1 x 1 1 1 0 0 both ports online, port 1 usable |
| 450 | * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync |
| 451 | * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync |
| 452 | * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode |
| 453 | * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode |
| 454 | * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync |
| 455 | * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync |
| 456 | * 1 0 x 1 1 1 0 0 both ports online, port 0 usable |
| 457 | * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync |
| 458 | * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync |
| 459 | * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync |
| 460 | * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync |
| 461 | */ |
| 462 | static struct etr_eacr etr_eacr; |
| 463 | static u64 etr_tolec; /* time of last eacr update */ |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 464 | static struct etr_aib etr_port0; |
| 465 | static int etr_port0_uptodate; |
| 466 | static struct etr_aib etr_port1; |
| 467 | static int etr_port1_uptodate; |
| 468 | static unsigned long etr_events; |
| 469 | static struct timer_list etr_timer; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 470 | |
| 471 | static void etr_timeout(unsigned long dummy); |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 472 | static void etr_work_fn(struct work_struct *work); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 473 | static DEFINE_MUTEX(etr_work_mutex); |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 474 | static DECLARE_WORK(etr_work, etr_work_fn); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 475 | |
| 476 | /* |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 477 | * Reset ETR attachment. |
| 478 | */ |
| 479 | static void etr_reset(void) |
| 480 | { |
| 481 | etr_eacr = (struct etr_eacr) { |
| 482 | .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0, |
| 483 | .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0, |
| 484 | .es = 0, .sl = 0 }; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 485 | if (etr_setr(&etr_eacr) == 0) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 486 | etr_tolec = get_clock(); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 487 | set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags); |
| 488 | } else if (etr_port0_online || etr_port1_online) { |
Martin Schwidefsky | feab650 | 2008-12-25 13:39:38 +0100 | [diff] [blame] | 489 | pr_warning("The real or virtual hardware system does " |
| 490 | "not provide an ETR interface\n"); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 491 | etr_port0_online = etr_port1_online = 0; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 492 | } |
| 493 | } |
| 494 | |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 495 | static int __init etr_init(void) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 496 | { |
| 497 | struct etr_aib aib; |
| 498 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 499 | if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags)) |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 500 | return 0; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 501 | time_init_wq(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 502 | /* Check if this machine has the steai instruction. */ |
| 503 | if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 504 | etr_steai_available = 1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 505 | setup_timer(&etr_timer, etr_timeout, 0UL); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 506 | if (etr_port0_online) { |
| 507 | set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 508 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 509 | } |
| 510 | if (etr_port1_online) { |
| 511 | set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 512 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 513 | } |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 514 | return 0; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 515 | } |
| 516 | |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 517 | arch_initcall(etr_init); |
| 518 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 519 | /* |
| 520 | * Two sorts of ETR machine checks. The architecture reads: |
| 521 | * "When a machine-check niterruption occurs and if a switch-to-local or |
| 522 | * ETR-sync-check interrupt request is pending but disabled, this pending |
| 523 | * disabled interruption request is indicated and is cleared". |
| 524 | * Which means that we can get etr_switch_to_local events from the machine |
| 525 | * check handler although the interruption condition is disabled. Lovely.. |
| 526 | */ |
| 527 | |
| 528 | /* |
| 529 | * Switch to local machine check. This is called when the last usable |
| 530 | * ETR port goes inactive. After switch to local the clock is not in sync. |
| 531 | */ |
| 532 | void etr_switch_to_local(void) |
| 533 | { |
| 534 | if (!etr_eacr.sl) |
| 535 | return; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 536 | if (test_bit(CLOCK_SYNC_ETR, &clock_sync_flags)) |
| 537 | disable_sync_clock(NULL); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 538 | set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 539 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 540 | } |
| 541 | |
| 542 | /* |
| 543 | * ETR sync check machine check. This is called when the ETR OTE and the |
| 544 | * local clock OTE are farther apart than the ETR sync check tolerance. |
| 545 | * After a ETR sync check the clock is not in sync. The machine check |
| 546 | * is broadcasted to all cpus at the same time. |
| 547 | */ |
| 548 | void etr_sync_check(void) |
| 549 | { |
| 550 | if (!etr_eacr.es) |
| 551 | return; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 552 | if (test_bit(CLOCK_SYNC_ETR, &clock_sync_flags)) |
| 553 | disable_sync_clock(NULL); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 554 | set_bit(ETR_EVENT_SYNC_CHECK, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 555 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 556 | } |
| 557 | |
| 558 | /* |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 559 | * ETR timing alert. There are two causes: |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 560 | * 1) port state change, check the usability of the port |
| 561 | * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the |
| 562 | * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3) |
| 563 | * or ETR-data word 4 (edf4) has changed. |
| 564 | */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 565 | static void etr_timing_alert(struct etr_irq_parm *intparm) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 566 | { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 567 | if (intparm->pc0) |
| 568 | /* ETR port 0 state change. */ |
| 569 | set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); |
| 570 | if (intparm->pc1) |
| 571 | /* ETR port 1 state change. */ |
| 572 | set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); |
| 573 | if (intparm->eai) |
| 574 | /* |
| 575 | * ETR port alert on either port 0, 1 or both. |
| 576 | * Both ports are not up-to-date now. |
| 577 | */ |
| 578 | set_bit(ETR_EVENT_PORT_ALERT, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 579 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | static void etr_timeout(unsigned long dummy) |
| 583 | { |
| 584 | set_bit(ETR_EVENT_UPDATE, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 585 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | /* |
| 589 | * Check if the etr mode is pss. |
| 590 | */ |
| 591 | static inline int etr_mode_is_pps(struct etr_eacr eacr) |
| 592 | { |
| 593 | return eacr.es && !eacr.sl; |
| 594 | } |
| 595 | |
| 596 | /* |
| 597 | * Check if the etr mode is etr. |
| 598 | */ |
| 599 | static inline int etr_mode_is_etr(struct etr_eacr eacr) |
| 600 | { |
| 601 | return eacr.es && eacr.sl; |
| 602 | } |
| 603 | |
| 604 | /* |
| 605 | * Check if the port can be used for TOD synchronization. |
| 606 | * For PPS mode the port has to receive OTEs. For ETR mode |
| 607 | * the port has to receive OTEs, the ETR stepping bit has to |
| 608 | * be zero and the validity bits for data frame 1, 2, and 3 |
| 609 | * have to be 1. |
| 610 | */ |
| 611 | static int etr_port_valid(struct etr_aib *aib, int port) |
| 612 | { |
| 613 | unsigned int psc; |
| 614 | |
| 615 | /* Check that this port is receiving OTEs. */ |
| 616 | if (aib->tsp == 0) |
| 617 | return 0; |
| 618 | |
| 619 | psc = port ? aib->esw.psc1 : aib->esw.psc0; |
| 620 | if (psc == etr_lpsc_pps_mode) |
| 621 | return 1; |
| 622 | if (psc == etr_lpsc_operational_step) |
| 623 | return !aib->esw.y && aib->slsw.v1 && |
| 624 | aib->slsw.v2 && aib->slsw.v3; |
| 625 | return 0; |
| 626 | } |
| 627 | |
| 628 | /* |
| 629 | * Check if two ports are on the same network. |
| 630 | */ |
| 631 | static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2) |
| 632 | { |
| 633 | // FIXME: any other fields we have to compare? |
| 634 | return aib1->edf1.net_id == aib2->edf1.net_id; |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * Wrapper for etr_stei that converts physical port states |
| 639 | * to logical port states to be consistent with the output |
| 640 | * of stetr (see etr_psc vs. etr_lpsc). |
| 641 | */ |
| 642 | static void etr_steai_cv(struct etr_aib *aib, unsigned int func) |
| 643 | { |
| 644 | BUG_ON(etr_steai(aib, func) != 0); |
| 645 | /* Convert port state to logical port state. */ |
| 646 | if (aib->esw.psc0 == 1) |
| 647 | aib->esw.psc0 = 2; |
| 648 | else if (aib->esw.psc0 == 0 && aib->esw.p == 0) |
| 649 | aib->esw.psc0 = 1; |
| 650 | if (aib->esw.psc1 == 1) |
| 651 | aib->esw.psc1 = 2; |
| 652 | else if (aib->esw.psc1 == 0 && aib->esw.p == 1) |
| 653 | aib->esw.psc1 = 1; |
| 654 | } |
| 655 | |
| 656 | /* |
| 657 | * Check if the aib a2 is still connected to the same attachment as |
| 658 | * aib a1, the etv values differ by one and a2 is valid. |
| 659 | */ |
| 660 | static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p) |
| 661 | { |
| 662 | int state_a1, state_a2; |
| 663 | |
| 664 | /* Paranoia check: e0/e1 should better be the same. */ |
| 665 | if (a1->esw.eacr.e0 != a2->esw.eacr.e0 || |
| 666 | a1->esw.eacr.e1 != a2->esw.eacr.e1) |
| 667 | return 0; |
| 668 | |
| 669 | /* Still connected to the same etr ? */ |
| 670 | state_a1 = p ? a1->esw.psc1 : a1->esw.psc0; |
| 671 | state_a2 = p ? a2->esw.psc1 : a2->esw.psc0; |
| 672 | if (state_a1 == etr_lpsc_operational_step) { |
| 673 | if (state_a2 != etr_lpsc_operational_step || |
| 674 | a1->edf1.net_id != a2->edf1.net_id || |
| 675 | a1->edf1.etr_id != a2->edf1.etr_id || |
| 676 | a1->edf1.etr_pn != a2->edf1.etr_pn) |
| 677 | return 0; |
| 678 | } else if (state_a2 != etr_lpsc_pps_mode) |
| 679 | return 0; |
| 680 | |
| 681 | /* The ETV value of a2 needs to be ETV of a1 + 1. */ |
| 682 | if (a1->edf2.etv + 1 != a2->edf2.etv) |
| 683 | return 0; |
| 684 | |
| 685 | if (!etr_port_valid(a2, p)) |
| 686 | return 0; |
| 687 | |
| 688 | return 1; |
| 689 | } |
| 690 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 691 | struct clock_sync_data { |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 692 | atomic_t cpus; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 693 | int in_sync; |
| 694 | unsigned long long fixup_cc; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 695 | int etr_port; |
| 696 | struct etr_aib *etr_aib; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 697 | }; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 698 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 699 | static void clock_sync_cpu(struct clock_sync_data *sync) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 700 | { |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 701 | atomic_dec(&sync->cpus); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 702 | enable_sync_clock(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 703 | /* |
| 704 | * This looks like a busy wait loop but it isn't. etr_sync_cpus |
| 705 | * is called on all other cpus while the TOD clocks is stopped. |
| 706 | * __udelay will stop the cpu on an enabled wait psw until the |
| 707 | * TOD is running again. |
| 708 | */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 709 | while (sync->in_sync == 0) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 710 | __udelay(1); |
Heiko Carstens | 6c732de | 2007-02-21 10:55:15 +0100 | [diff] [blame] | 711 | /* |
| 712 | * A different cpu changes *in_sync. Therefore use |
| 713 | * barrier() to force memory access. |
| 714 | */ |
| 715 | barrier(); |
| 716 | } |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 717 | if (sync->in_sync != 1) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 718 | /* Didn't work. Clear per-cpu in sync bit again. */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 719 | disable_sync_clock(NULL); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 720 | /* |
| 721 | * This round of TOD syncing is done. Set the clock comparator |
| 722 | * to the next tick and let the processor continue. |
| 723 | */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 724 | fixup_clock_comparator(sync->fixup_cc); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 725 | } |
| 726 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 727 | /* |
| 728 | * Sync the TOD clock using the port refered to by aibp. This port |
| 729 | * has to be enabled and the other port has to be disabled. The |
| 730 | * last eacr update has to be more than 1.6 seconds in the past. |
| 731 | */ |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 732 | static int etr_sync_clock(void *data) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 733 | { |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 734 | static int first; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 735 | unsigned long long clock, old_clock, delay, delta; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 736 | struct clock_sync_data *etr_sync; |
| 737 | struct etr_aib *sync_port, *aib; |
| 738 | int port; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 739 | int rc; |
| 740 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 741 | etr_sync = data; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 742 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 743 | if (xchg(&first, 1) == 1) { |
| 744 | /* Slave */ |
| 745 | clock_sync_cpu(etr_sync); |
| 746 | return 0; |
| 747 | } |
| 748 | |
| 749 | /* Wait until all other cpus entered the sync function. */ |
| 750 | while (atomic_read(&etr_sync->cpus) != 0) |
| 751 | cpu_relax(); |
| 752 | |
| 753 | port = etr_sync->etr_port; |
| 754 | aib = etr_sync->etr_aib; |
| 755 | sync_port = (port == 0) ? &etr_port0 : &etr_port1; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 756 | enable_sync_clock(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 757 | |
| 758 | /* Set clock to next OTE. */ |
| 759 | __ctl_set_bit(14, 21); |
| 760 | __ctl_set_bit(0, 29); |
| 761 | clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 762 | old_clock = get_clock(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 763 | if (set_clock(clock) == 0) { |
| 764 | __udelay(1); /* Wait for the clock to start. */ |
| 765 | __ctl_clear_bit(0, 29); |
| 766 | __ctl_clear_bit(14, 21); |
| 767 | etr_stetr(aib); |
| 768 | /* Adjust Linux timing variables. */ |
| 769 | delay = (unsigned long long) |
| 770 | (aib->edf2.etv - sync_port->edf2.etv) << 32; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 771 | delta = adjust_time(old_clock, clock, delay); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 772 | etr_sync->fixup_cc = delta; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 773 | fixup_clock_comparator(delta); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 774 | /* Verify that the clock is properly set. */ |
| 775 | if (!etr_aib_follows(sync_port, aib, port)) { |
| 776 | /* Didn't work. */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 777 | disable_sync_clock(NULL); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 778 | etr_sync->in_sync = -EAGAIN; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 779 | rc = -EAGAIN; |
| 780 | } else { |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 781 | etr_sync->in_sync = 1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 782 | rc = 0; |
| 783 | } |
| 784 | } else { |
| 785 | /* Could not set the clock ?!? */ |
| 786 | __ctl_clear_bit(0, 29); |
| 787 | __ctl_clear_bit(14, 21); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 788 | disable_sync_clock(NULL); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 789 | etr_sync->in_sync = -EAGAIN; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 790 | rc = -EAGAIN; |
| 791 | } |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 792 | xchg(&first, 0); |
| 793 | return rc; |
| 794 | } |
| 795 | |
| 796 | static int etr_sync_clock_stop(struct etr_aib *aib, int port) |
| 797 | { |
| 798 | struct clock_sync_data etr_sync; |
| 799 | struct etr_aib *sync_port; |
| 800 | int follows; |
| 801 | int rc; |
| 802 | |
| 803 | /* Check if the current aib is adjacent to the sync port aib. */ |
| 804 | sync_port = (port == 0) ? &etr_port0 : &etr_port1; |
| 805 | follows = etr_aib_follows(sync_port, aib, port); |
| 806 | memcpy(sync_port, aib, sizeof(*aib)); |
| 807 | if (!follows) |
| 808 | return -EAGAIN; |
| 809 | memset(&etr_sync, 0, sizeof(etr_sync)); |
| 810 | etr_sync.etr_aib = aib; |
| 811 | etr_sync.etr_port = port; |
| 812 | get_online_cpus(); |
| 813 | atomic_set(&etr_sync.cpus, num_online_cpus() - 1); |
| 814 | rc = stop_machine(etr_sync_clock, &etr_sync, &cpu_online_map); |
| 815 | put_online_cpus(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 816 | return rc; |
| 817 | } |
| 818 | |
| 819 | /* |
| 820 | * Handle the immediate effects of the different events. |
| 821 | * The port change event is used for online/offline changes. |
| 822 | */ |
| 823 | static struct etr_eacr etr_handle_events(struct etr_eacr eacr) |
| 824 | { |
| 825 | if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events)) |
| 826 | eacr.es = 0; |
| 827 | if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events)) |
| 828 | eacr.es = eacr.sl = 0; |
| 829 | if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events)) |
| 830 | etr_port0_uptodate = etr_port1_uptodate = 0; |
| 831 | |
| 832 | if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) { |
| 833 | if (eacr.e0) |
| 834 | /* |
| 835 | * Port change of an enabled port. We have to |
| 836 | * assume that this can have caused an stepping |
| 837 | * port switch. |
| 838 | */ |
| 839 | etr_tolec = get_clock(); |
| 840 | eacr.p0 = etr_port0_online; |
| 841 | if (!eacr.p0) |
| 842 | eacr.e0 = 0; |
| 843 | etr_port0_uptodate = 0; |
| 844 | } |
| 845 | if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) { |
| 846 | if (eacr.e1) |
| 847 | /* |
| 848 | * Port change of an enabled port. We have to |
| 849 | * assume that this can have caused an stepping |
| 850 | * port switch. |
| 851 | */ |
| 852 | etr_tolec = get_clock(); |
| 853 | eacr.p1 = etr_port1_online; |
| 854 | if (!eacr.p1) |
| 855 | eacr.e1 = 0; |
| 856 | etr_port1_uptodate = 0; |
| 857 | } |
| 858 | clear_bit(ETR_EVENT_UPDATE, &etr_events); |
| 859 | return eacr; |
| 860 | } |
| 861 | |
| 862 | /* |
| 863 | * Set up a timer that expires after the etr_tolec + 1.6 seconds if |
| 864 | * one of the ports needs an update. |
| 865 | */ |
| 866 | static void etr_set_tolec_timeout(unsigned long long now) |
| 867 | { |
| 868 | unsigned long micros; |
| 869 | |
| 870 | if ((!etr_eacr.p0 || etr_port0_uptodate) && |
| 871 | (!etr_eacr.p1 || etr_port1_uptodate)) |
| 872 | return; |
| 873 | micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0; |
| 874 | micros = (micros > 1600000) ? 0 : 1600000 - micros; |
| 875 | mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1); |
| 876 | } |
| 877 | |
| 878 | /* |
| 879 | * Set up a time that expires after 1/2 second. |
| 880 | */ |
| 881 | static void etr_set_sync_timeout(void) |
| 882 | { |
| 883 | mod_timer(&etr_timer, jiffies + HZ/2); |
| 884 | } |
| 885 | |
| 886 | /* |
| 887 | * Update the aib information for one or both ports. |
| 888 | */ |
| 889 | static struct etr_eacr etr_handle_update(struct etr_aib *aib, |
| 890 | struct etr_eacr eacr) |
| 891 | { |
| 892 | /* With both ports disabled the aib information is useless. */ |
| 893 | if (!eacr.e0 && !eacr.e1) |
| 894 | return eacr; |
| 895 | |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 896 | /* Update port0 or port1 with aib stored in etr_work_fn. */ |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 897 | if (aib->esw.q == 0) { |
| 898 | /* Information for port 0 stored. */ |
| 899 | if (eacr.p0 && !etr_port0_uptodate) { |
| 900 | etr_port0 = *aib; |
| 901 | if (etr_port0_online) |
| 902 | etr_port0_uptodate = 1; |
| 903 | } |
| 904 | } else { |
| 905 | /* Information for port 1 stored. */ |
| 906 | if (eacr.p1 && !etr_port1_uptodate) { |
| 907 | etr_port1 = *aib; |
| 908 | if (etr_port0_online) |
| 909 | etr_port1_uptodate = 1; |
| 910 | } |
| 911 | } |
| 912 | |
| 913 | /* |
| 914 | * Do not try to get the alternate port aib if the clock |
| 915 | * is not in sync yet. |
| 916 | */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 917 | if (!test_bit(CLOCK_SYNC_STP, &clock_sync_flags) && !eacr.es) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 918 | return eacr; |
| 919 | |
| 920 | /* |
| 921 | * If steai is available we can get the information about |
| 922 | * the other port immediately. If only stetr is available the |
| 923 | * data-port bit toggle has to be used. |
| 924 | */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 925 | if (etr_steai_available) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 926 | if (eacr.p0 && !etr_port0_uptodate) { |
| 927 | etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0); |
| 928 | etr_port0_uptodate = 1; |
| 929 | } |
| 930 | if (eacr.p1 && !etr_port1_uptodate) { |
| 931 | etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1); |
| 932 | etr_port1_uptodate = 1; |
| 933 | } |
| 934 | } else { |
| 935 | /* |
| 936 | * One port was updated above, if the other |
| 937 | * port is not uptodate toggle dp bit. |
| 938 | */ |
| 939 | if ((eacr.p0 && !etr_port0_uptodate) || |
| 940 | (eacr.p1 && !etr_port1_uptodate)) |
| 941 | eacr.dp ^= 1; |
| 942 | else |
| 943 | eacr.dp = 0; |
| 944 | } |
| 945 | return eacr; |
| 946 | } |
| 947 | |
| 948 | /* |
| 949 | * Write new etr control register if it differs from the current one. |
| 950 | * Return 1 if etr_tolec has been updated as well. |
| 951 | */ |
| 952 | static void etr_update_eacr(struct etr_eacr eacr) |
| 953 | { |
| 954 | int dp_changed; |
| 955 | |
| 956 | if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0) |
| 957 | /* No change, return. */ |
| 958 | return; |
| 959 | /* |
| 960 | * The disable of an active port of the change of the data port |
| 961 | * bit can/will cause a change in the data port. |
| 962 | */ |
| 963 | dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 || |
| 964 | (etr_eacr.dp ^ eacr.dp) != 0; |
| 965 | etr_eacr = eacr; |
| 966 | etr_setr(&etr_eacr); |
| 967 | if (dp_changed) |
| 968 | etr_tolec = get_clock(); |
| 969 | } |
| 970 | |
| 971 | /* |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 972 | * ETR work. In this function you'll find the main logic. In |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 973 | * particular this is the only function that calls etr_update_eacr(), |
| 974 | * it "controls" the etr control register. |
| 975 | */ |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 976 | static void etr_work_fn(struct work_struct *work) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 977 | { |
| 978 | unsigned long long now; |
| 979 | struct etr_eacr eacr; |
| 980 | struct etr_aib aib; |
| 981 | int sync_port; |
| 982 | |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 983 | /* prevent multiple execution. */ |
| 984 | mutex_lock(&etr_work_mutex); |
| 985 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 986 | /* Create working copy of etr_eacr. */ |
| 987 | eacr = etr_eacr; |
| 988 | |
| 989 | /* Check for the different events and their immediate effects. */ |
| 990 | eacr = etr_handle_events(eacr); |
| 991 | |
| 992 | /* Check if ETR is supposed to be active. */ |
| 993 | eacr.ea = eacr.p0 || eacr.p1; |
| 994 | if (!eacr.ea) { |
| 995 | /* Both ports offline. Reset everything. */ |
| 996 | eacr.dp = eacr.es = eacr.sl = 0; |
Ingo Molnar | 1a781a7 | 2008-07-15 21:55:59 +0200 | [diff] [blame] | 997 | on_each_cpu(disable_sync_clock, NULL, 1); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 998 | del_timer_sync(&etr_timer); |
| 999 | etr_update_eacr(eacr); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1000 | clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1001 | goto out_unlock; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1002 | } |
| 1003 | |
| 1004 | /* Store aib to get the current ETR status word. */ |
| 1005 | BUG_ON(etr_stetr(&aib) != 0); |
| 1006 | etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */ |
| 1007 | now = get_clock(); |
| 1008 | |
| 1009 | /* |
| 1010 | * Update the port information if the last stepping port change |
| 1011 | * or data port change is older than 1.6 seconds. |
| 1012 | */ |
| 1013 | if (now >= etr_tolec + (1600000 << 12)) |
| 1014 | eacr = etr_handle_update(&aib, eacr); |
| 1015 | |
| 1016 | /* |
| 1017 | * Select ports to enable. The prefered synchronization mode is PPS. |
| 1018 | * If a port can be enabled depends on a number of things: |
| 1019 | * 1) The port needs to be online and uptodate. A port is not |
| 1020 | * disabled just because it is not uptodate, but it is only |
| 1021 | * enabled if it is uptodate. |
| 1022 | * 2) The port needs to have the same mode (pps / etr). |
| 1023 | * 3) The port needs to be usable -> etr_port_valid() == 1 |
| 1024 | * 4) To enable the second port the clock needs to be in sync. |
| 1025 | * 5) If both ports are useable and are ETR ports, the network id |
| 1026 | * has to be the same. |
| 1027 | * The eacr.sl bit is used to indicate etr mode vs. pps mode. |
| 1028 | */ |
| 1029 | if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) { |
| 1030 | eacr.sl = 0; |
| 1031 | eacr.e0 = 1; |
| 1032 | if (!etr_mode_is_pps(etr_eacr)) |
| 1033 | eacr.es = 0; |
| 1034 | if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode) |
| 1035 | eacr.e1 = 0; |
| 1036 | // FIXME: uptodate checks ? |
| 1037 | else if (etr_port0_uptodate && etr_port1_uptodate) |
| 1038 | eacr.e1 = 1; |
| 1039 | sync_port = (etr_port0_uptodate && |
| 1040 | etr_port_valid(&etr_port0, 0)) ? 0 : -1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1041 | } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) { |
| 1042 | eacr.sl = 0; |
| 1043 | eacr.e0 = 0; |
| 1044 | eacr.e1 = 1; |
| 1045 | if (!etr_mode_is_pps(etr_eacr)) |
| 1046 | eacr.es = 0; |
| 1047 | sync_port = (etr_port1_uptodate && |
| 1048 | etr_port_valid(&etr_port1, 1)) ? 1 : -1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1049 | } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) { |
| 1050 | eacr.sl = 1; |
| 1051 | eacr.e0 = 1; |
| 1052 | if (!etr_mode_is_etr(etr_eacr)) |
| 1053 | eacr.es = 0; |
| 1054 | if (!eacr.es || !eacr.p1 || |
| 1055 | aib.esw.psc1 != etr_lpsc_operational_alt) |
| 1056 | eacr.e1 = 0; |
| 1057 | else if (etr_port0_uptodate && etr_port1_uptodate && |
| 1058 | etr_compare_network(&etr_port0, &etr_port1)) |
| 1059 | eacr.e1 = 1; |
| 1060 | sync_port = (etr_port0_uptodate && |
| 1061 | etr_port_valid(&etr_port0, 0)) ? 0 : -1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1062 | } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) { |
| 1063 | eacr.sl = 1; |
| 1064 | eacr.e0 = 0; |
| 1065 | eacr.e1 = 1; |
| 1066 | if (!etr_mode_is_etr(etr_eacr)) |
| 1067 | eacr.es = 0; |
| 1068 | sync_port = (etr_port1_uptodate && |
| 1069 | etr_port_valid(&etr_port1, 1)) ? 1 : -1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1070 | } else { |
| 1071 | /* Both ports not usable. */ |
| 1072 | eacr.es = eacr.sl = 0; |
| 1073 | sync_port = -1; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1074 | clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1075 | } |
| 1076 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1077 | if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags)) |
| 1078 | eacr.es = 0; |
| 1079 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1080 | /* |
| 1081 | * If the clock is in sync just update the eacr and return. |
| 1082 | * If there is no valid sync port wait for a port update. |
| 1083 | */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1084 | if (test_bit(CLOCK_SYNC_STP, &clock_sync_flags) || |
| 1085 | eacr.es || sync_port < 0) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1086 | etr_update_eacr(eacr); |
| 1087 | etr_set_tolec_timeout(now); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1088 | goto out_unlock; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1089 | } |
| 1090 | |
| 1091 | /* |
| 1092 | * Prepare control register for clock syncing |
| 1093 | * (reset data port bit, set sync check control. |
| 1094 | */ |
| 1095 | eacr.dp = 0; |
| 1096 | eacr.es = 1; |
| 1097 | |
| 1098 | /* |
| 1099 | * Update eacr and try to synchronize the clock. If the update |
| 1100 | * of eacr caused a stepping port switch (or if we have to |
| 1101 | * assume that a stepping port switch has occured) or the |
| 1102 | * clock syncing failed, reset the sync check control bit |
| 1103 | * and set up a timer to try again after 0.5 seconds |
| 1104 | */ |
| 1105 | etr_update_eacr(eacr); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1106 | set_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1107 | if (now < etr_tolec + (1600000 << 12) || |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1108 | etr_sync_clock_stop(&aib, sync_port) != 0) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1109 | /* Sync failed. Try again in 1/2 second. */ |
| 1110 | eacr.es = 0; |
| 1111 | etr_update_eacr(eacr); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1112 | clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1113 | etr_set_sync_timeout(); |
| 1114 | } else |
| 1115 | etr_set_tolec_timeout(now); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1116 | out_unlock: |
| 1117 | mutex_unlock(&etr_work_mutex); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1118 | } |
| 1119 | |
| 1120 | /* |
| 1121 | * Sysfs interface functions |
| 1122 | */ |
| 1123 | static struct sysdev_class etr_sysclass = { |
Kay Sievers | af5ca3f | 2007-12-20 02:09:39 +0100 | [diff] [blame] | 1124 | .name = "etr", |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1125 | }; |
| 1126 | |
| 1127 | static struct sys_device etr_port0_dev = { |
| 1128 | .id = 0, |
| 1129 | .cls = &etr_sysclass, |
| 1130 | }; |
| 1131 | |
| 1132 | static struct sys_device etr_port1_dev = { |
| 1133 | .id = 1, |
| 1134 | .cls = &etr_sysclass, |
| 1135 | }; |
| 1136 | |
| 1137 | /* |
| 1138 | * ETR class attributes |
| 1139 | */ |
| 1140 | static ssize_t etr_stepping_port_show(struct sysdev_class *class, char *buf) |
| 1141 | { |
| 1142 | return sprintf(buf, "%i\n", etr_port0.esw.p); |
| 1143 | } |
| 1144 | |
| 1145 | static SYSDEV_CLASS_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL); |
| 1146 | |
| 1147 | static ssize_t etr_stepping_mode_show(struct sysdev_class *class, char *buf) |
| 1148 | { |
| 1149 | char *mode_str; |
| 1150 | |
| 1151 | if (etr_mode_is_pps(etr_eacr)) |
| 1152 | mode_str = "pps"; |
| 1153 | else if (etr_mode_is_etr(etr_eacr)) |
| 1154 | mode_str = "etr"; |
| 1155 | else |
| 1156 | mode_str = "local"; |
| 1157 | return sprintf(buf, "%s\n", mode_str); |
| 1158 | } |
| 1159 | |
| 1160 | static SYSDEV_CLASS_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL); |
| 1161 | |
| 1162 | /* |
| 1163 | * ETR port attributes |
| 1164 | */ |
| 1165 | static inline struct etr_aib *etr_aib_from_dev(struct sys_device *dev) |
| 1166 | { |
| 1167 | if (dev == &etr_port0_dev) |
| 1168 | return etr_port0_online ? &etr_port0 : NULL; |
| 1169 | else |
| 1170 | return etr_port1_online ? &etr_port1 : NULL; |
| 1171 | } |
| 1172 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1173 | static ssize_t etr_online_show(struct sys_device *dev, |
| 1174 | struct sysdev_attribute *attr, |
| 1175 | char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1176 | { |
| 1177 | unsigned int online; |
| 1178 | |
| 1179 | online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online; |
| 1180 | return sprintf(buf, "%i\n", online); |
| 1181 | } |
| 1182 | |
| 1183 | static ssize_t etr_online_store(struct sys_device *dev, |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1184 | struct sysdev_attribute *attr, |
| 1185 | const char *buf, size_t count) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1186 | { |
| 1187 | unsigned int value; |
| 1188 | |
| 1189 | value = simple_strtoul(buf, NULL, 0); |
| 1190 | if (value != 0 && value != 1) |
| 1191 | return -EINVAL; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1192 | if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags)) |
| 1193 | return -EOPNOTSUPP; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1194 | if (dev == &etr_port0_dev) { |
| 1195 | if (etr_port0_online == value) |
| 1196 | return count; /* Nothing to do. */ |
| 1197 | etr_port0_online = value; |
| 1198 | set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1199 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1200 | } else { |
| 1201 | if (etr_port1_online == value) |
| 1202 | return count; /* Nothing to do. */ |
| 1203 | etr_port1_online = value; |
| 1204 | set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1205 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1206 | } |
| 1207 | return count; |
| 1208 | } |
| 1209 | |
| 1210 | static SYSDEV_ATTR(online, 0600, etr_online_show, etr_online_store); |
| 1211 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1212 | static ssize_t etr_stepping_control_show(struct sys_device *dev, |
| 1213 | struct sysdev_attribute *attr, |
| 1214 | char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1215 | { |
| 1216 | return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ? |
| 1217 | etr_eacr.e0 : etr_eacr.e1); |
| 1218 | } |
| 1219 | |
| 1220 | static SYSDEV_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL); |
| 1221 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1222 | static ssize_t etr_mode_code_show(struct sys_device *dev, |
| 1223 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1224 | { |
| 1225 | if (!etr_port0_online && !etr_port1_online) |
| 1226 | /* Status word is not uptodate if both ports are offline. */ |
| 1227 | return -ENODATA; |
| 1228 | return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ? |
| 1229 | etr_port0.esw.psc0 : etr_port0.esw.psc1); |
| 1230 | } |
| 1231 | |
| 1232 | static SYSDEV_ATTR(state_code, 0400, etr_mode_code_show, NULL); |
| 1233 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1234 | static ssize_t etr_untuned_show(struct sys_device *dev, |
| 1235 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1236 | { |
| 1237 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1238 | |
| 1239 | if (!aib || !aib->slsw.v1) |
| 1240 | return -ENODATA; |
| 1241 | return sprintf(buf, "%i\n", aib->edf1.u); |
| 1242 | } |
| 1243 | |
| 1244 | static SYSDEV_ATTR(untuned, 0400, etr_untuned_show, NULL); |
| 1245 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1246 | static ssize_t etr_network_id_show(struct sys_device *dev, |
| 1247 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1248 | { |
| 1249 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1250 | |
| 1251 | if (!aib || !aib->slsw.v1) |
| 1252 | return -ENODATA; |
| 1253 | return sprintf(buf, "%i\n", aib->edf1.net_id); |
| 1254 | } |
| 1255 | |
| 1256 | static SYSDEV_ATTR(network, 0400, etr_network_id_show, NULL); |
| 1257 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1258 | static ssize_t etr_id_show(struct sys_device *dev, |
| 1259 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1260 | { |
| 1261 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1262 | |
| 1263 | if (!aib || !aib->slsw.v1) |
| 1264 | return -ENODATA; |
| 1265 | return sprintf(buf, "%i\n", aib->edf1.etr_id); |
| 1266 | } |
| 1267 | |
| 1268 | static SYSDEV_ATTR(id, 0400, etr_id_show, NULL); |
| 1269 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1270 | static ssize_t etr_port_number_show(struct sys_device *dev, |
| 1271 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1272 | { |
| 1273 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1274 | |
| 1275 | if (!aib || !aib->slsw.v1) |
| 1276 | return -ENODATA; |
| 1277 | return sprintf(buf, "%i\n", aib->edf1.etr_pn); |
| 1278 | } |
| 1279 | |
| 1280 | static SYSDEV_ATTR(port, 0400, etr_port_number_show, NULL); |
| 1281 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1282 | static ssize_t etr_coupled_show(struct sys_device *dev, |
| 1283 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1284 | { |
| 1285 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1286 | |
| 1287 | if (!aib || !aib->slsw.v3) |
| 1288 | return -ENODATA; |
| 1289 | return sprintf(buf, "%i\n", aib->edf3.c); |
| 1290 | } |
| 1291 | |
| 1292 | static SYSDEV_ATTR(coupled, 0400, etr_coupled_show, NULL); |
| 1293 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1294 | static ssize_t etr_local_time_show(struct sys_device *dev, |
| 1295 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1296 | { |
| 1297 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1298 | |
| 1299 | if (!aib || !aib->slsw.v3) |
| 1300 | return -ENODATA; |
| 1301 | return sprintf(buf, "%i\n", aib->edf3.blto); |
| 1302 | } |
| 1303 | |
| 1304 | static SYSDEV_ATTR(local_time, 0400, etr_local_time_show, NULL); |
| 1305 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1306 | static ssize_t etr_utc_offset_show(struct sys_device *dev, |
| 1307 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1308 | { |
| 1309 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1310 | |
| 1311 | if (!aib || !aib->slsw.v3) |
| 1312 | return -ENODATA; |
| 1313 | return sprintf(buf, "%i\n", aib->edf3.buo); |
| 1314 | } |
| 1315 | |
| 1316 | static SYSDEV_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL); |
| 1317 | |
| 1318 | static struct sysdev_attribute *etr_port_attributes[] = { |
| 1319 | &attr_online, |
| 1320 | &attr_stepping_control, |
| 1321 | &attr_state_code, |
| 1322 | &attr_untuned, |
| 1323 | &attr_network, |
| 1324 | &attr_id, |
| 1325 | &attr_port, |
| 1326 | &attr_coupled, |
| 1327 | &attr_local_time, |
| 1328 | &attr_utc_offset, |
| 1329 | NULL |
| 1330 | }; |
| 1331 | |
| 1332 | static int __init etr_register_port(struct sys_device *dev) |
| 1333 | { |
| 1334 | struct sysdev_attribute **attr; |
| 1335 | int rc; |
| 1336 | |
| 1337 | rc = sysdev_register(dev); |
| 1338 | if (rc) |
| 1339 | goto out; |
| 1340 | for (attr = etr_port_attributes; *attr; attr++) { |
| 1341 | rc = sysdev_create_file(dev, *attr); |
| 1342 | if (rc) |
| 1343 | goto out_unreg; |
| 1344 | } |
| 1345 | return 0; |
| 1346 | out_unreg: |
| 1347 | for (; attr >= etr_port_attributes; attr--) |
| 1348 | sysdev_remove_file(dev, *attr); |
| 1349 | sysdev_unregister(dev); |
| 1350 | out: |
| 1351 | return rc; |
| 1352 | } |
| 1353 | |
| 1354 | static void __init etr_unregister_port(struct sys_device *dev) |
| 1355 | { |
| 1356 | struct sysdev_attribute **attr; |
| 1357 | |
| 1358 | for (attr = etr_port_attributes; *attr; attr++) |
| 1359 | sysdev_remove_file(dev, *attr); |
| 1360 | sysdev_unregister(dev); |
| 1361 | } |
| 1362 | |
| 1363 | static int __init etr_init_sysfs(void) |
| 1364 | { |
| 1365 | int rc; |
| 1366 | |
| 1367 | rc = sysdev_class_register(&etr_sysclass); |
| 1368 | if (rc) |
| 1369 | goto out; |
| 1370 | rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_port); |
| 1371 | if (rc) |
| 1372 | goto out_unreg_class; |
| 1373 | rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_mode); |
| 1374 | if (rc) |
| 1375 | goto out_remove_stepping_port; |
| 1376 | rc = etr_register_port(&etr_port0_dev); |
| 1377 | if (rc) |
| 1378 | goto out_remove_stepping_mode; |
| 1379 | rc = etr_register_port(&etr_port1_dev); |
| 1380 | if (rc) |
| 1381 | goto out_remove_port0; |
| 1382 | return 0; |
| 1383 | |
| 1384 | out_remove_port0: |
| 1385 | etr_unregister_port(&etr_port0_dev); |
| 1386 | out_remove_stepping_mode: |
| 1387 | sysdev_class_remove_file(&etr_sysclass, &attr_stepping_mode); |
| 1388 | out_remove_stepping_port: |
| 1389 | sysdev_class_remove_file(&etr_sysclass, &attr_stepping_port); |
| 1390 | out_unreg_class: |
| 1391 | sysdev_class_unregister(&etr_sysclass); |
| 1392 | out: |
| 1393 | return rc; |
| 1394 | } |
| 1395 | |
| 1396 | device_initcall(etr_init_sysfs); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1397 | |
| 1398 | /* |
| 1399 | * Server Time Protocol (STP) code. |
| 1400 | */ |
| 1401 | static int stp_online; |
| 1402 | static struct stp_sstpi stp_info; |
| 1403 | static void *stp_page; |
| 1404 | |
| 1405 | static void stp_work_fn(struct work_struct *work); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1406 | static DEFINE_MUTEX(stp_work_mutex); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1407 | static DECLARE_WORK(stp_work, stp_work_fn); |
| 1408 | |
| 1409 | static int __init early_parse_stp(char *p) |
| 1410 | { |
| 1411 | if (strncmp(p, "off", 3) == 0) |
| 1412 | stp_online = 0; |
| 1413 | else if (strncmp(p, "on", 2) == 0) |
| 1414 | stp_online = 1; |
| 1415 | return 0; |
| 1416 | } |
| 1417 | early_param("stp", early_parse_stp); |
| 1418 | |
| 1419 | /* |
| 1420 | * Reset STP attachment. |
| 1421 | */ |
Heiko Carstens | 8f84700 | 2008-08-01 16:39:19 +0200 | [diff] [blame] | 1422 | static void __init stp_reset(void) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1423 | { |
| 1424 | int rc; |
| 1425 | |
| 1426 | stp_page = alloc_bootmem_pages(PAGE_SIZE); |
| 1427 | rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000); |
Martin Schwidefsky | 4a672cf | 2008-10-10 21:33:29 +0200 | [diff] [blame] | 1428 | if (rc == 0) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1429 | set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags); |
| 1430 | else if (stp_online) { |
Martin Schwidefsky | feab650 | 2008-12-25 13:39:38 +0100 | [diff] [blame] | 1431 | pr_warning("The real or virtual hardware system does " |
| 1432 | "not provide an STP interface\n"); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1433 | free_bootmem((unsigned long) stp_page, PAGE_SIZE); |
| 1434 | stp_page = NULL; |
| 1435 | stp_online = 0; |
| 1436 | } |
| 1437 | } |
| 1438 | |
| 1439 | static int __init stp_init(void) |
| 1440 | { |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1441 | if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags)) |
| 1442 | return 0; |
| 1443 | time_init_wq(); |
| 1444 | if (!stp_online) |
| 1445 | return 0; |
| 1446 | queue_work(time_sync_wq, &stp_work); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1447 | return 0; |
| 1448 | } |
| 1449 | |
| 1450 | arch_initcall(stp_init); |
| 1451 | |
| 1452 | /* |
| 1453 | * STP timing alert. There are three causes: |
| 1454 | * 1) timing status change |
| 1455 | * 2) link availability change |
| 1456 | * 3) time control parameter change |
| 1457 | * In all three cases we are only interested in the clock source state. |
| 1458 | * If a STP clock source is now available use it. |
| 1459 | */ |
| 1460 | static void stp_timing_alert(struct stp_irq_parm *intparm) |
| 1461 | { |
| 1462 | if (intparm->tsc || intparm->lac || intparm->tcpc) |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1463 | queue_work(time_sync_wq, &stp_work); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1464 | } |
| 1465 | |
| 1466 | /* |
| 1467 | * STP sync check machine check. This is called when the timing state |
| 1468 | * changes from the synchronized state to the unsynchronized state. |
| 1469 | * After a STP sync check the clock is not in sync. The machine check |
| 1470 | * is broadcasted to all cpus at the same time. |
| 1471 | */ |
| 1472 | void stp_sync_check(void) |
| 1473 | { |
| 1474 | if (!test_bit(CLOCK_SYNC_STP, &clock_sync_flags)) |
| 1475 | return; |
| 1476 | disable_sync_clock(NULL); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1477 | queue_work(time_sync_wq, &stp_work); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1478 | } |
| 1479 | |
| 1480 | /* |
| 1481 | * STP island condition machine check. This is called when an attached |
| 1482 | * server attempts to communicate over an STP link and the servers |
| 1483 | * have matching CTN ids and have a valid stratum-1 configuration |
| 1484 | * but the configurations do not match. |
| 1485 | */ |
| 1486 | void stp_island_check(void) |
| 1487 | { |
| 1488 | if (!test_bit(CLOCK_SYNC_STP, &clock_sync_flags)) |
| 1489 | return; |
| 1490 | disable_sync_clock(NULL); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1491 | queue_work(time_sync_wq, &stp_work); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1492 | } |
| 1493 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1494 | |
| 1495 | static int stp_sync_clock(void *data) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1496 | { |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1497 | static int first; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1498 | unsigned long long old_clock, delta; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1499 | struct clock_sync_data *stp_sync; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1500 | int rc; |
| 1501 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1502 | stp_sync = data; |
| 1503 | |
| 1504 | if (xchg(&first, 1) == 1) { |
| 1505 | /* Slave */ |
| 1506 | clock_sync_cpu(stp_sync); |
| 1507 | return 0; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1508 | } |
| 1509 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1510 | /* Wait until all other cpus entered the sync function. */ |
| 1511 | while (atomic_read(&stp_sync->cpus) != 0) |
| 1512 | cpu_relax(); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1513 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1514 | enable_sync_clock(); |
| 1515 | |
| 1516 | set_bit(CLOCK_SYNC_STP, &clock_sync_flags); |
| 1517 | if (test_and_clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags)) |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1518 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1519 | |
| 1520 | rc = 0; |
| 1521 | if (stp_info.todoff[0] || stp_info.todoff[1] || |
| 1522 | stp_info.todoff[2] || stp_info.todoff[3] || |
| 1523 | stp_info.tmd != 2) { |
| 1524 | old_clock = get_clock(); |
| 1525 | rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0); |
| 1526 | if (rc == 0) { |
| 1527 | delta = adjust_time(old_clock, get_clock(), 0); |
| 1528 | fixup_clock_comparator(delta); |
| 1529 | rc = chsc_sstpi(stp_page, &stp_info, |
| 1530 | sizeof(struct stp_sstpi)); |
| 1531 | if (rc == 0 && stp_info.tmd != 2) |
| 1532 | rc = -EAGAIN; |
| 1533 | } |
| 1534 | } |
| 1535 | if (rc) { |
| 1536 | disable_sync_clock(NULL); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1537 | stp_sync->in_sync = -EAGAIN; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1538 | clear_bit(CLOCK_SYNC_STP, &clock_sync_flags); |
| 1539 | if (etr_port0_online || etr_port1_online) |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1540 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1541 | } else |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1542 | stp_sync->in_sync = 1; |
| 1543 | xchg(&first, 0); |
| 1544 | return 0; |
| 1545 | } |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1546 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1547 | /* |
| 1548 | * STP work. Check for the STP state and take over the clock |
| 1549 | * synchronization if the STP clock source is usable. |
| 1550 | */ |
| 1551 | static void stp_work_fn(struct work_struct *work) |
| 1552 | { |
| 1553 | struct clock_sync_data stp_sync; |
| 1554 | int rc; |
| 1555 | |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1556 | /* prevent multiple execution. */ |
| 1557 | mutex_lock(&stp_work_mutex); |
| 1558 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1559 | if (!stp_online) { |
| 1560 | chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1561 | goto out_unlock; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1562 | } |
| 1563 | |
| 1564 | rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0); |
| 1565 | if (rc) |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1566 | goto out_unlock; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1567 | |
| 1568 | rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi)); |
| 1569 | if (rc || stp_info.c == 0) |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1570 | goto out_unlock; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1571 | |
| 1572 | memset(&stp_sync, 0, sizeof(stp_sync)); |
| 1573 | get_online_cpus(); |
| 1574 | atomic_set(&stp_sync.cpus, num_online_cpus() - 1); |
| 1575 | stop_machine(stp_sync_clock, &stp_sync, &cpu_online_map); |
| 1576 | put_online_cpus(); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1577 | |
| 1578 | out_unlock: |
| 1579 | mutex_unlock(&stp_work_mutex); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1580 | } |
| 1581 | |
| 1582 | /* |
| 1583 | * STP class sysfs interface functions |
| 1584 | */ |
| 1585 | static struct sysdev_class stp_sysclass = { |
| 1586 | .name = "stp", |
| 1587 | }; |
| 1588 | |
| 1589 | static ssize_t stp_ctn_id_show(struct sysdev_class *class, char *buf) |
| 1590 | { |
| 1591 | if (!stp_online) |
| 1592 | return -ENODATA; |
| 1593 | return sprintf(buf, "%016llx\n", |
| 1594 | *(unsigned long long *) stp_info.ctnid); |
| 1595 | } |
| 1596 | |
| 1597 | static SYSDEV_CLASS_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL); |
| 1598 | |
| 1599 | static ssize_t stp_ctn_type_show(struct sysdev_class *class, char *buf) |
| 1600 | { |
| 1601 | if (!stp_online) |
| 1602 | return -ENODATA; |
| 1603 | return sprintf(buf, "%i\n", stp_info.ctn); |
| 1604 | } |
| 1605 | |
| 1606 | static SYSDEV_CLASS_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL); |
| 1607 | |
| 1608 | static ssize_t stp_dst_offset_show(struct sysdev_class *class, char *buf) |
| 1609 | { |
| 1610 | if (!stp_online || !(stp_info.vbits & 0x2000)) |
| 1611 | return -ENODATA; |
| 1612 | return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto); |
| 1613 | } |
| 1614 | |
| 1615 | static SYSDEV_CLASS_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL); |
| 1616 | |
| 1617 | static ssize_t stp_leap_seconds_show(struct sysdev_class *class, char *buf) |
| 1618 | { |
| 1619 | if (!stp_online || !(stp_info.vbits & 0x8000)) |
| 1620 | return -ENODATA; |
| 1621 | return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps); |
| 1622 | } |
| 1623 | |
| 1624 | static SYSDEV_CLASS_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL); |
| 1625 | |
| 1626 | static ssize_t stp_stratum_show(struct sysdev_class *class, char *buf) |
| 1627 | { |
| 1628 | if (!stp_online) |
| 1629 | return -ENODATA; |
| 1630 | return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum); |
| 1631 | } |
| 1632 | |
| 1633 | static SYSDEV_CLASS_ATTR(stratum, 0400, stp_stratum_show, NULL); |
| 1634 | |
| 1635 | static ssize_t stp_time_offset_show(struct sysdev_class *class, char *buf) |
| 1636 | { |
| 1637 | if (!stp_online || !(stp_info.vbits & 0x0800)) |
| 1638 | return -ENODATA; |
| 1639 | return sprintf(buf, "%i\n", (int) stp_info.tto); |
| 1640 | } |
| 1641 | |
| 1642 | static SYSDEV_CLASS_ATTR(time_offset, 0400, stp_time_offset_show, NULL); |
| 1643 | |
| 1644 | static ssize_t stp_time_zone_offset_show(struct sysdev_class *class, char *buf) |
| 1645 | { |
| 1646 | if (!stp_online || !(stp_info.vbits & 0x4000)) |
| 1647 | return -ENODATA; |
| 1648 | return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo); |
| 1649 | } |
| 1650 | |
| 1651 | static SYSDEV_CLASS_ATTR(time_zone_offset, 0400, |
| 1652 | stp_time_zone_offset_show, NULL); |
| 1653 | |
| 1654 | static ssize_t stp_timing_mode_show(struct sysdev_class *class, char *buf) |
| 1655 | { |
| 1656 | if (!stp_online) |
| 1657 | return -ENODATA; |
| 1658 | return sprintf(buf, "%i\n", stp_info.tmd); |
| 1659 | } |
| 1660 | |
| 1661 | static SYSDEV_CLASS_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL); |
| 1662 | |
| 1663 | static ssize_t stp_timing_state_show(struct sysdev_class *class, char *buf) |
| 1664 | { |
| 1665 | if (!stp_online) |
| 1666 | return -ENODATA; |
| 1667 | return sprintf(buf, "%i\n", stp_info.tst); |
| 1668 | } |
| 1669 | |
| 1670 | static SYSDEV_CLASS_ATTR(timing_state, 0400, stp_timing_state_show, NULL); |
| 1671 | |
| 1672 | static ssize_t stp_online_show(struct sysdev_class *class, char *buf) |
| 1673 | { |
| 1674 | return sprintf(buf, "%i\n", stp_online); |
| 1675 | } |
| 1676 | |
| 1677 | static ssize_t stp_online_store(struct sysdev_class *class, |
| 1678 | const char *buf, size_t count) |
| 1679 | { |
| 1680 | unsigned int value; |
| 1681 | |
| 1682 | value = simple_strtoul(buf, NULL, 0); |
| 1683 | if (value != 0 && value != 1) |
| 1684 | return -EINVAL; |
| 1685 | if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags)) |
| 1686 | return -EOPNOTSUPP; |
| 1687 | stp_online = value; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1688 | queue_work(time_sync_wq, &stp_work); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1689 | return count; |
| 1690 | } |
| 1691 | |
| 1692 | /* |
| 1693 | * Can't use SYSDEV_CLASS_ATTR because the attribute should be named |
| 1694 | * stp/online but attr_online already exists in this file .. |
| 1695 | */ |
| 1696 | static struct sysdev_class_attribute attr_stp_online = { |
| 1697 | .attr = { .name = "online", .mode = 0600 }, |
| 1698 | .show = stp_online_show, |
| 1699 | .store = stp_online_store, |
| 1700 | }; |
| 1701 | |
| 1702 | static struct sysdev_class_attribute *stp_attributes[] = { |
| 1703 | &attr_ctn_id, |
| 1704 | &attr_ctn_type, |
| 1705 | &attr_dst_offset, |
| 1706 | &attr_leap_seconds, |
| 1707 | &attr_stp_online, |
| 1708 | &attr_stratum, |
| 1709 | &attr_time_offset, |
| 1710 | &attr_time_zone_offset, |
| 1711 | &attr_timing_mode, |
| 1712 | &attr_timing_state, |
| 1713 | NULL |
| 1714 | }; |
| 1715 | |
| 1716 | static int __init stp_init_sysfs(void) |
| 1717 | { |
| 1718 | struct sysdev_class_attribute **attr; |
| 1719 | int rc; |
| 1720 | |
| 1721 | rc = sysdev_class_register(&stp_sysclass); |
| 1722 | if (rc) |
| 1723 | goto out; |
| 1724 | for (attr = stp_attributes; *attr; attr++) { |
| 1725 | rc = sysdev_class_create_file(&stp_sysclass, *attr); |
| 1726 | if (rc) |
| 1727 | goto out_unreg; |
| 1728 | } |
| 1729 | return 0; |
| 1730 | out_unreg: |
| 1731 | for (; attr >= stp_attributes; attr--) |
| 1732 | sysdev_class_remove_file(&stp_sysclass, *attr); |
| 1733 | sysdev_class_unregister(&stp_sysclass); |
| 1734 | out: |
| 1735 | return rc; |
| 1736 | } |
| 1737 | |
| 1738 | device_initcall(stp_init_sysfs); |