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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/uaccess.h> |
| 40 | #include <asm/delay.h> |
| 41 | #include <asm/s390_ext.h> |
| 42 | #include <asm/div64.h> |
Martin Schwidefsky | b020632 | 2008-12-25 13:38:36 +0100 | [diff] [blame] | 43 | #include <asm/vdso.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <asm/irq.h> |
Heiko Carstens | 5a489b9 | 2006-10-06 16:38:35 +0200 | [diff] [blame] | 45 | #include <asm/irq_regs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <asm/timer.h> |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 47 | #include <asm/etr.h> |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 48 | #include <asm/cio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | /* change this if you have some constant time drift */ |
| 51 | #define USECS_PER_JIFFY ((unsigned long) 1000000/HZ) |
| 52 | #define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12) |
| 53 | |
Martin Schwidefsky | b6112cc | 2009-04-14 15:36:28 +0200 | [diff] [blame] | 54 | u64 sched_clock_base_cc = -1; /* Force to data section. */ |
Heiko Carstens | 05e7ff7 | 2009-09-11 10:28:31 +0200 | [diff] [blame] | 55 | EXPORT_SYMBOL_GPL(sched_clock_base_cc); |
Martin Schwidefsky | b6112cc | 2009-04-14 15:36:28 +0200 | [diff] [blame] | 56 | |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 57 | static DEFINE_PER_CPU(struct clock_event_device, comparators); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | /* |
| 60 | * Scheduler clock - returns current time in nanosec units. |
| 61 | */ |
Heiko Carstens | 88dbd20 | 2009-06-12 10:26:46 +0200 | [diff] [blame] | 62 | unsigned long long notrace sched_clock(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | { |
Heiko Carstens | 05e7ff7 | 2009-09-11 10:28:31 +0200 | [diff] [blame] | 64 | return (get_clock_monotonic() * 125) >> 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | } |
| 66 | |
Jan Glauber | 32f65f2 | 2006-02-01 03:06:33 -0800 | [diff] [blame] | 67 | /* |
| 68 | * Monotonic_clock - returns # of nanoseconds passed since time_init() |
| 69 | */ |
| 70 | unsigned long long monotonic_clock(void) |
| 71 | { |
| 72 | return sched_clock(); |
| 73 | } |
| 74 | EXPORT_SYMBOL(monotonic_clock); |
| 75 | |
John Stultz | b1e2ba8 | 2010-03-08 12:25:19 +0100 | [diff] [blame] | 76 | void tod_to_timeval(__u64 todval, struct timespec *xt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | { |
| 78 | unsigned long long sec; |
| 79 | |
| 80 | sec = todval >> 12; |
| 81 | do_div(sec, 1000000); |
John Stultz | b1e2ba8 | 2010-03-08 12:25:19 +0100 | [diff] [blame] | 82 | xt->tv_sec = sec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | todval -= (sec * 1000000) << 12; |
John Stultz | b1e2ba8 | 2010-03-08 12:25:19 +0100 | [diff] [blame] | 84 | xt->tv_nsec = ((todval * 1000) >> 12); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
Christof Schmitt | b592e89 | 2009-08-18 15:43:31 +0200 | [diff] [blame] | 86 | EXPORT_SYMBOL(tod_to_timeval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 88 | void clock_comparator_work(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 90 | struct clock_event_device *cd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 92 | S390_lowcore.clock_comparator = -1ULL; |
| 93 | set_clock_comparator(S390_lowcore.clock_comparator); |
| 94 | cd = &__get_cpu_var(comparators); |
| 95 | cd->event_handler(cd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | } |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | /* |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 99 | * Fixup the clock comparator. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | */ |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 101 | static void fixup_clock_comparator(unsigned long long delta) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 103 | /* If nobody is waiting there's nothing to fix. */ |
| 104 | if (S390_lowcore.clock_comparator == -1ULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | return; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 106 | S390_lowcore.clock_comparator += delta; |
| 107 | set_clock_comparator(S390_lowcore.clock_comparator); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
| 109 | |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 110 | static int s390_next_event(unsigned long delta, |
| 111 | struct clock_event_device *evt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 113 | S390_lowcore.clock_comparator = get_clock() + delta; |
| 114 | set_clock_comparator(S390_lowcore.clock_comparator); |
| 115 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 118 | static void s390_set_mode(enum clock_event_mode mode, |
| 119 | struct clock_event_device *evt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 121 | } |
| 122 | |
| 123 | /* |
| 124 | * Set up lowcore and control register of the current cpu to |
| 125 | * enable TOD clock and clock comparator interrupts. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | */ |
| 127 | void init_cpu_timer(void) |
| 128 | { |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 129 | struct clock_event_device *cd; |
| 130 | int cpu; |
| 131 | |
| 132 | S390_lowcore.clock_comparator = -1ULL; |
| 133 | set_clock_comparator(S390_lowcore.clock_comparator); |
| 134 | |
| 135 | cpu = smp_processor_id(); |
| 136 | cd = &per_cpu(comparators, cpu); |
| 137 | cd->name = "comparator"; |
| 138 | cd->features = CLOCK_EVT_FEAT_ONESHOT; |
| 139 | cd->mult = 16777; |
| 140 | cd->shift = 12; |
| 141 | cd->min_delta_ns = 1; |
| 142 | cd->max_delta_ns = LONG_MAX; |
| 143 | cd->rating = 400; |
Rusty Russell | 320ab2b | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 144 | cd->cpumask = cpumask_of(cpu); |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 145 | cd->set_next_event = s390_next_event; |
| 146 | cd->set_mode = s390_set_mode; |
| 147 | |
| 148 | clockevents_register_device(cd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 150 | /* Enable clock comparator timer interrupt. */ |
| 151 | __ctl_set_bit(0,11); |
| 152 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 153 | /* Always allow the timing alert external interrupt. */ |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 154 | __ctl_set_bit(0, 4); |
| 155 | } |
| 156 | |
| 157 | static void clock_comparator_interrupt(__u16 code) |
| 158 | { |
Heiko Carstens | d3d238c | 2008-10-03 21:54:59 +0200 | [diff] [blame] | 159 | if (S390_lowcore.clock_comparator == -1ULL) |
| 160 | set_clock_comparator(S390_lowcore.clock_comparator); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 161 | } |
| 162 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 163 | static void etr_timing_alert(struct etr_irq_parm *); |
| 164 | static void stp_timing_alert(struct stp_irq_parm *); |
| 165 | |
| 166 | static void timing_alert_interrupt(__u16 code) |
| 167 | { |
| 168 | if (S390_lowcore.ext_params & 0x00c40000) |
| 169 | etr_timing_alert((struct etr_irq_parm *) |
| 170 | &S390_lowcore.ext_params); |
| 171 | if (S390_lowcore.ext_params & 0x00038000) |
| 172 | stp_timing_alert((struct stp_irq_parm *) |
| 173 | &S390_lowcore.ext_params); |
| 174 | } |
| 175 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 176 | static void etr_reset(void); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 177 | static void stp_reset(void); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 178 | |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 179 | void read_persistent_clock(struct timespec *ts) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 180 | { |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 181 | tod_to_timeval(get_clock() - TOD_UNIX_EPOCH, ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
Martin Schwidefsky | 23970e3 | 2009-08-14 15:47:32 +0200 | [diff] [blame] | 184 | void read_boot_clock(struct timespec *ts) |
| 185 | { |
| 186 | tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | |
Magnus Damm | 8e19608 | 2009-04-21 12:24:00 -0700 | [diff] [blame] | 189 | static cycle_t read_tod_clock(struct clocksource *cs) |
Martin Schwidefsky | dc64bef | 2006-10-06 16:38:48 +0200 | [diff] [blame] | 190 | { |
| 191 | return get_clock(); |
| 192 | } |
| 193 | |
| 194 | static struct clocksource clocksource_tod = { |
| 195 | .name = "tod", |
Christian Borntraeger | d2cb0e6 | 2007-11-05 11:10:14 +0100 | [diff] [blame] | 196 | .rating = 400, |
Martin Schwidefsky | dc64bef | 2006-10-06 16:38:48 +0200 | [diff] [blame] | 197 | .read = read_tod_clock, |
| 198 | .mask = -1ULL, |
| 199 | .mult = 1000, |
| 200 | .shift = 12, |
Thomas Gleixner | cc02d80 | 2007-02-16 01:27:39 -0800 | [diff] [blame] | 201 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
Martin Schwidefsky | dc64bef | 2006-10-06 16:38:48 +0200 | [diff] [blame] | 202 | }; |
| 203 | |
Martin Schwidefsky | f1b8274 | 2009-08-14 15:47:21 +0200 | [diff] [blame] | 204 | struct clocksource * __init clocksource_default_clock(void) |
| 205 | { |
| 206 | return &clocksource_tod; |
| 207 | } |
Martin Schwidefsky | dc64bef | 2006-10-06 16:38:48 +0200 | [diff] [blame] | 208 | |
Lin Ming | 0696b71 | 2009-11-17 13:49:50 +0800 | [diff] [blame] | 209 | void update_vsyscall(struct timespec *wall_time, struct clocksource *clock, |
| 210 | u32 mult) |
Martin Schwidefsky | b020632 | 2008-12-25 13:38:36 +0100 | [diff] [blame] | 211 | { |
| 212 | if (clock != &clocksource_tod) |
| 213 | return; |
| 214 | |
| 215 | /* Make userspace gettimeofday spin until we're done. */ |
| 216 | ++vdso_data->tb_update_count; |
| 217 | smp_wmb(); |
| 218 | vdso_data->xtime_tod_stamp = clock->cycle_last; |
John Stultz | b1e2ba8 | 2010-03-08 12:25:19 +0100 | [diff] [blame] | 219 | vdso_data->xtime_clock_sec = wall_time->tv_sec; |
| 220 | vdso_data->xtime_clock_nsec = wall_time->tv_nsec; |
Martin Schwidefsky | b020632 | 2008-12-25 13:38:36 +0100 | [diff] [blame] | 221 | vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec; |
| 222 | vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec; |
| 223 | smp_wmb(); |
| 224 | ++vdso_data->tb_update_count; |
| 225 | } |
| 226 | |
| 227 | extern struct timezone sys_tz; |
| 228 | |
| 229 | void update_vsyscall_tz(void) |
| 230 | { |
| 231 | /* Make userspace gettimeofday spin until we're done. */ |
| 232 | ++vdso_data->tb_update_count; |
| 233 | smp_wmb(); |
| 234 | vdso_data->tz_minuteswest = sys_tz.tz_minuteswest; |
| 235 | vdso_data->tz_dsttime = sys_tz.tz_dsttime; |
| 236 | smp_wmb(); |
| 237 | ++vdso_data->tb_update_count; |
| 238 | } |
| 239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | /* |
| 241 | * Initialize the TOD clock and the CPU timer of |
| 242 | * the boot cpu. |
| 243 | */ |
| 244 | void __init time_init(void) |
| 245 | { |
Martin Schwidefsky | b6112cc | 2009-04-14 15:36:28 +0200 | [diff] [blame] | 246 | /* Reset time synchronization interfaces. */ |
| 247 | etr_reset(); |
| 248 | stp_reset(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | /* request the clock comparator external interrupt */ |
Heiko Carstens | d7d1104 | 2009-06-22 12:08:03 +0200 | [diff] [blame] | 251 | if (register_external_interrupt(0x1004, clock_comparator_interrupt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | panic("Couldn't request external interrupt 0x1004"); |
| 253 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 254 | /* request the timing alert external interrupt */ |
Heiko Carstens | d7d1104 | 2009-06-22 12:08:03 +0200 | [diff] [blame] | 255 | if (register_external_interrupt(0x1406, timing_alert_interrupt)) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 256 | panic("Couldn't request external interrupt 0x1406"); |
| 257 | |
Martin Schwidefsky | ab96e79 | 2009-04-14 15:36:29 +0200 | [diff] [blame] | 258 | if (clocksource_register(&clocksource_tod) != 0) |
| 259 | panic("Could not register TOD clock source"); |
| 260 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 261 | /* Enable TOD clock interrupts on the boot cpu. */ |
| 262 | init_cpu_timer(); |
Martin Schwidefsky | ab96e79 | 2009-04-14 15:36:29 +0200 | [diff] [blame] | 263 | |
Martin Schwidefsky | c185b78 | 2008-12-25 13:39:25 +0100 | [diff] [blame] | 264 | /* Enable cpu timer interrupts on the boot cpu. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | vtime_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 268 | /* |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 269 | * The time is "clock". old is what we think the time is. |
| 270 | * Adjust the value by a multiple of jiffies and add the delta to ntp. |
| 271 | * "delay" is an approximation how long the synchronization took. If |
| 272 | * the time correction is positive, then "delay" is subtracted from |
| 273 | * the time difference and only the remaining part is passed to ntp. |
| 274 | */ |
| 275 | static unsigned long long adjust_time(unsigned long long old, |
| 276 | unsigned long long clock, |
| 277 | unsigned long long delay) |
| 278 | { |
| 279 | unsigned long long delta, ticks; |
| 280 | struct timex adjust; |
| 281 | |
| 282 | if (clock > old) { |
| 283 | /* It is later than we thought. */ |
| 284 | delta = ticks = clock - old; |
| 285 | delta = ticks = (delta < delay) ? 0 : delta - delay; |
| 286 | delta -= do_div(ticks, CLK_TICKS_PER_JIFFY); |
| 287 | adjust.offset = ticks * (1000000 / HZ); |
| 288 | } else { |
| 289 | /* It is earlier than we thought. */ |
| 290 | delta = ticks = old - clock; |
| 291 | delta -= do_div(ticks, CLK_TICKS_PER_JIFFY); |
| 292 | delta = -delta; |
| 293 | adjust.offset = -ticks * (1000000 / HZ); |
| 294 | } |
Christian Borntraeger | 8107d82 | 2008-11-27 11:05:56 +0100 | [diff] [blame] | 295 | sched_clock_base_cc += delta; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 296 | if (adjust.offset != 0) { |
Martin Schwidefsky | feab650 | 2008-12-25 13:39:38 +0100 | [diff] [blame] | 297 | pr_notice("The ETR interface has adjusted the clock " |
| 298 | "by %li microseconds\n", adjust.offset); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 299 | adjust.modes = ADJ_OFFSET_SINGLESHOT; |
| 300 | do_adjtimex(&adjust); |
| 301 | } |
| 302 | return delta; |
| 303 | } |
| 304 | |
| 305 | static DEFINE_PER_CPU(atomic_t, clock_sync_word); |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 306 | static DEFINE_MUTEX(clock_sync_mutex); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 307 | static unsigned long clock_sync_flags; |
| 308 | |
| 309 | #define CLOCK_SYNC_HAS_ETR 0 |
| 310 | #define CLOCK_SYNC_HAS_STP 1 |
| 311 | #define CLOCK_SYNC_ETR 2 |
| 312 | #define CLOCK_SYNC_STP 3 |
| 313 | |
| 314 | /* |
| 315 | * The synchronous get_clock function. It will write the current clock |
| 316 | * value to the clock pointer and return 0 if the clock is in sync with |
| 317 | * the external time source. If the clock mode is local it will return |
| 318 | * -ENOSYS and -EAGAIN if the clock is not in sync with the external |
| 319 | * reference. |
| 320 | */ |
| 321 | int get_sync_clock(unsigned long long *clock) |
| 322 | { |
| 323 | atomic_t *sw_ptr; |
| 324 | unsigned int sw0, sw1; |
| 325 | |
| 326 | sw_ptr = &get_cpu_var(clock_sync_word); |
| 327 | sw0 = atomic_read(sw_ptr); |
| 328 | *clock = get_clock(); |
| 329 | sw1 = atomic_read(sw_ptr); |
Heiko Carstens | bd119ee | 2009-12-07 12:52:14 +0100 | [diff] [blame] | 330 | put_cpu_var(clock_sync_word); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 331 | if (sw0 == sw1 && (sw0 & 0x80000000U)) |
| 332 | /* Success: time is in sync. */ |
| 333 | return 0; |
| 334 | if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) && |
| 335 | !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags)) |
| 336 | return -ENOSYS; |
| 337 | if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) && |
| 338 | !test_bit(CLOCK_SYNC_STP, &clock_sync_flags)) |
| 339 | return -EACCES; |
| 340 | return -EAGAIN; |
| 341 | } |
| 342 | EXPORT_SYMBOL(get_sync_clock); |
| 343 | |
| 344 | /* |
| 345 | * Make get_sync_clock return -EAGAIN. |
| 346 | */ |
| 347 | static void disable_sync_clock(void *dummy) |
| 348 | { |
| 349 | atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word); |
| 350 | /* |
| 351 | * Clear the in-sync bit 2^31. All get_sync_clock calls will |
| 352 | * fail until the sync bit is turned back on. In addition |
| 353 | * increase the "sequence" counter to avoid the race of an |
| 354 | * etr event and the complete recovery against get_sync_clock. |
| 355 | */ |
| 356 | atomic_clear_mask(0x80000000, sw_ptr); |
| 357 | atomic_inc(sw_ptr); |
| 358 | } |
| 359 | |
| 360 | /* |
| 361 | * Make get_sync_clock return 0 again. |
| 362 | * Needs to be called from a context disabled for preemption. |
| 363 | */ |
| 364 | static void enable_sync_clock(void) |
| 365 | { |
| 366 | atomic_t *sw_ptr = &__get_cpu_var(clock_sync_word); |
| 367 | atomic_set_mask(0x80000000, sw_ptr); |
| 368 | } |
| 369 | |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 370 | /* |
| 371 | * Function to check if the clock is in sync. |
| 372 | */ |
| 373 | static inline int check_sync_clock(void) |
| 374 | { |
| 375 | atomic_t *sw_ptr; |
| 376 | int rc; |
| 377 | |
| 378 | sw_ptr = &get_cpu_var(clock_sync_word); |
| 379 | rc = (atomic_read(sw_ptr) & 0x80000000U) != 0; |
Heiko Carstens | bd119ee | 2009-12-07 12:52:14 +0100 | [diff] [blame] | 380 | put_cpu_var(clock_sync_word); |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 381 | return rc; |
| 382 | } |
| 383 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 384 | /* Single threaded workqueue used for etr and stp sync events */ |
| 385 | static struct workqueue_struct *time_sync_wq; |
| 386 | |
| 387 | static void __init time_init_wq(void) |
| 388 | { |
Heiko Carstens | 179cb81 | 2009-01-23 16:40:26 +0100 | [diff] [blame] | 389 | if (time_sync_wq) |
| 390 | return; |
| 391 | time_sync_wq = create_singlethread_workqueue("timesync"); |
| 392 | stop_machine_create(); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 393 | } |
| 394 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 395 | /* |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 396 | * External Time Reference (ETR) code. |
| 397 | */ |
| 398 | static int etr_port0_online; |
| 399 | static int etr_port1_online; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 400 | static int etr_steai_available; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 401 | |
| 402 | static int __init early_parse_etr(char *p) |
| 403 | { |
| 404 | if (strncmp(p, "off", 3) == 0) |
| 405 | etr_port0_online = etr_port1_online = 0; |
| 406 | else if (strncmp(p, "port0", 5) == 0) |
| 407 | etr_port0_online = 1; |
| 408 | else if (strncmp(p, "port1", 5) == 0) |
| 409 | etr_port1_online = 1; |
| 410 | else if (strncmp(p, "on", 2) == 0) |
| 411 | etr_port0_online = etr_port1_online = 1; |
| 412 | return 0; |
| 413 | } |
| 414 | early_param("etr", early_parse_etr); |
| 415 | |
| 416 | enum etr_event { |
| 417 | ETR_EVENT_PORT0_CHANGE, |
| 418 | ETR_EVENT_PORT1_CHANGE, |
| 419 | ETR_EVENT_PORT_ALERT, |
| 420 | ETR_EVENT_SYNC_CHECK, |
| 421 | ETR_EVENT_SWITCH_LOCAL, |
| 422 | ETR_EVENT_UPDATE, |
| 423 | }; |
| 424 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 425 | /* |
| 426 | * Valid bit combinations of the eacr register are (x = don't care): |
| 427 | * e0 e1 dp p0 p1 ea es sl |
| 428 | * 0 0 x 0 0 0 0 0 initial, disabled state |
| 429 | * 0 0 x 0 1 1 0 0 port 1 online |
| 430 | * 0 0 x 1 0 1 0 0 port 0 online |
| 431 | * 0 0 x 1 1 1 0 0 both ports online |
| 432 | * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode |
| 433 | * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode |
| 434 | * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync |
| 435 | * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync |
| 436 | * 0 1 x 1 1 1 0 0 both ports online, port 1 usable |
| 437 | * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync |
| 438 | * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync |
| 439 | * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode |
| 440 | * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode |
| 441 | * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync |
| 442 | * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync |
| 443 | * 1 0 x 1 1 1 0 0 both ports online, port 0 usable |
| 444 | * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync |
| 445 | * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync |
| 446 | * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync |
| 447 | * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync |
| 448 | */ |
| 449 | static struct etr_eacr etr_eacr; |
| 450 | static u64 etr_tolec; /* time of last eacr update */ |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 451 | static struct etr_aib etr_port0; |
| 452 | static int etr_port0_uptodate; |
| 453 | static struct etr_aib etr_port1; |
| 454 | static int etr_port1_uptodate; |
| 455 | static unsigned long etr_events; |
| 456 | static struct timer_list etr_timer; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 457 | |
| 458 | static void etr_timeout(unsigned long dummy); |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 459 | static void etr_work_fn(struct work_struct *work); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 460 | static DEFINE_MUTEX(etr_work_mutex); |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 461 | static DECLARE_WORK(etr_work, etr_work_fn); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 462 | |
| 463 | /* |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 464 | * Reset ETR attachment. |
| 465 | */ |
| 466 | static void etr_reset(void) |
| 467 | { |
| 468 | etr_eacr = (struct etr_eacr) { |
| 469 | .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0, |
| 470 | .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0, |
| 471 | .es = 0, .sl = 0 }; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 472 | if (etr_setr(&etr_eacr) == 0) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 473 | etr_tolec = get_clock(); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 474 | set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags); |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 475 | if (etr_port0_online && etr_port1_online) |
| 476 | set_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 477 | } else if (etr_port0_online || etr_port1_online) { |
Martin Schwidefsky | feab650 | 2008-12-25 13:39:38 +0100 | [diff] [blame] | 478 | pr_warning("The real or virtual hardware system does " |
| 479 | "not provide an ETR interface\n"); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 480 | etr_port0_online = etr_port1_online = 0; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 481 | } |
| 482 | } |
| 483 | |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 484 | static int __init etr_init(void) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 485 | { |
| 486 | struct etr_aib aib; |
| 487 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 488 | if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags)) |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 489 | return 0; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 490 | time_init_wq(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 491 | /* Check if this machine has the steai instruction. */ |
| 492 | if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 493 | etr_steai_available = 1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 494 | setup_timer(&etr_timer, etr_timeout, 0UL); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 495 | if (etr_port0_online) { |
| 496 | set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 497 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 498 | } |
| 499 | if (etr_port1_online) { |
| 500 | set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 501 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 502 | } |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 503 | return 0; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 504 | } |
| 505 | |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 506 | arch_initcall(etr_init); |
| 507 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 508 | /* |
| 509 | * Two sorts of ETR machine checks. The architecture reads: |
| 510 | * "When a machine-check niterruption occurs and if a switch-to-local or |
| 511 | * ETR-sync-check interrupt request is pending but disabled, this pending |
| 512 | * disabled interruption request is indicated and is cleared". |
| 513 | * Which means that we can get etr_switch_to_local events from the machine |
| 514 | * check handler although the interruption condition is disabled. Lovely.. |
| 515 | */ |
| 516 | |
| 517 | /* |
| 518 | * Switch to local machine check. This is called when the last usable |
| 519 | * ETR port goes inactive. After switch to local the clock is not in sync. |
| 520 | */ |
| 521 | void etr_switch_to_local(void) |
| 522 | { |
| 523 | if (!etr_eacr.sl) |
| 524 | return; |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 525 | disable_sync_clock(NULL); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 526 | set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 527 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | /* |
| 531 | * ETR sync check machine check. This is called when the ETR OTE and the |
| 532 | * local clock OTE are farther apart than the ETR sync check tolerance. |
| 533 | * After a ETR sync check the clock is not in sync. The machine check |
| 534 | * is broadcasted to all cpus at the same time. |
| 535 | */ |
| 536 | void etr_sync_check(void) |
| 537 | { |
| 538 | if (!etr_eacr.es) |
| 539 | return; |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 540 | disable_sync_clock(NULL); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 541 | set_bit(ETR_EVENT_SYNC_CHECK, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 542 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 543 | } |
| 544 | |
| 545 | /* |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 546 | * ETR timing alert. There are two causes: |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 547 | * 1) port state change, check the usability of the port |
| 548 | * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the |
| 549 | * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3) |
| 550 | * or ETR-data word 4 (edf4) has changed. |
| 551 | */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 552 | static void etr_timing_alert(struct etr_irq_parm *intparm) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 553 | { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 554 | if (intparm->pc0) |
| 555 | /* ETR port 0 state change. */ |
| 556 | set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); |
| 557 | if (intparm->pc1) |
| 558 | /* ETR port 1 state change. */ |
| 559 | set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); |
| 560 | if (intparm->eai) |
| 561 | /* |
| 562 | * ETR port alert on either port 0, 1 or both. |
| 563 | * Both ports are not up-to-date now. |
| 564 | */ |
| 565 | set_bit(ETR_EVENT_PORT_ALERT, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 566 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 567 | } |
| 568 | |
| 569 | static void etr_timeout(unsigned long dummy) |
| 570 | { |
| 571 | set_bit(ETR_EVENT_UPDATE, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 572 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | /* |
| 576 | * Check if the etr mode is pss. |
| 577 | */ |
| 578 | static inline int etr_mode_is_pps(struct etr_eacr eacr) |
| 579 | { |
| 580 | return eacr.es && !eacr.sl; |
| 581 | } |
| 582 | |
| 583 | /* |
| 584 | * Check if the etr mode is etr. |
| 585 | */ |
| 586 | static inline int etr_mode_is_etr(struct etr_eacr eacr) |
| 587 | { |
| 588 | return eacr.es && eacr.sl; |
| 589 | } |
| 590 | |
| 591 | /* |
| 592 | * Check if the port can be used for TOD synchronization. |
| 593 | * For PPS mode the port has to receive OTEs. For ETR mode |
| 594 | * the port has to receive OTEs, the ETR stepping bit has to |
| 595 | * be zero and the validity bits for data frame 1, 2, and 3 |
| 596 | * have to be 1. |
| 597 | */ |
| 598 | static int etr_port_valid(struct etr_aib *aib, int port) |
| 599 | { |
| 600 | unsigned int psc; |
| 601 | |
| 602 | /* Check that this port is receiving OTEs. */ |
| 603 | if (aib->tsp == 0) |
| 604 | return 0; |
| 605 | |
| 606 | psc = port ? aib->esw.psc1 : aib->esw.psc0; |
| 607 | if (psc == etr_lpsc_pps_mode) |
| 608 | return 1; |
| 609 | if (psc == etr_lpsc_operational_step) |
| 610 | return !aib->esw.y && aib->slsw.v1 && |
| 611 | aib->slsw.v2 && aib->slsw.v3; |
| 612 | return 0; |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * Check if two ports are on the same network. |
| 617 | */ |
| 618 | static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2) |
| 619 | { |
| 620 | // FIXME: any other fields we have to compare? |
| 621 | return aib1->edf1.net_id == aib2->edf1.net_id; |
| 622 | } |
| 623 | |
| 624 | /* |
| 625 | * Wrapper for etr_stei that converts physical port states |
| 626 | * to logical port states to be consistent with the output |
| 627 | * of stetr (see etr_psc vs. etr_lpsc). |
| 628 | */ |
| 629 | static void etr_steai_cv(struct etr_aib *aib, unsigned int func) |
| 630 | { |
| 631 | BUG_ON(etr_steai(aib, func) != 0); |
| 632 | /* Convert port state to logical port state. */ |
| 633 | if (aib->esw.psc0 == 1) |
| 634 | aib->esw.psc0 = 2; |
| 635 | else if (aib->esw.psc0 == 0 && aib->esw.p == 0) |
| 636 | aib->esw.psc0 = 1; |
| 637 | if (aib->esw.psc1 == 1) |
| 638 | aib->esw.psc1 = 2; |
| 639 | else if (aib->esw.psc1 == 0 && aib->esw.p == 1) |
| 640 | aib->esw.psc1 = 1; |
| 641 | } |
| 642 | |
| 643 | /* |
| 644 | * Check if the aib a2 is still connected to the same attachment as |
| 645 | * aib a1, the etv values differ by one and a2 is valid. |
| 646 | */ |
| 647 | static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p) |
| 648 | { |
| 649 | int state_a1, state_a2; |
| 650 | |
| 651 | /* Paranoia check: e0/e1 should better be the same. */ |
| 652 | if (a1->esw.eacr.e0 != a2->esw.eacr.e0 || |
| 653 | a1->esw.eacr.e1 != a2->esw.eacr.e1) |
| 654 | return 0; |
| 655 | |
| 656 | /* Still connected to the same etr ? */ |
| 657 | state_a1 = p ? a1->esw.psc1 : a1->esw.psc0; |
| 658 | state_a2 = p ? a2->esw.psc1 : a2->esw.psc0; |
| 659 | if (state_a1 == etr_lpsc_operational_step) { |
| 660 | if (state_a2 != etr_lpsc_operational_step || |
| 661 | a1->edf1.net_id != a2->edf1.net_id || |
| 662 | a1->edf1.etr_id != a2->edf1.etr_id || |
| 663 | a1->edf1.etr_pn != a2->edf1.etr_pn) |
| 664 | return 0; |
| 665 | } else if (state_a2 != etr_lpsc_pps_mode) |
| 666 | return 0; |
| 667 | |
| 668 | /* The ETV value of a2 needs to be ETV of a1 + 1. */ |
| 669 | if (a1->edf2.etv + 1 != a2->edf2.etv) |
| 670 | return 0; |
| 671 | |
| 672 | if (!etr_port_valid(a2, p)) |
| 673 | return 0; |
| 674 | |
| 675 | return 1; |
| 676 | } |
| 677 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 678 | struct clock_sync_data { |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 679 | atomic_t cpus; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 680 | int in_sync; |
| 681 | unsigned long long fixup_cc; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 682 | int etr_port; |
| 683 | struct etr_aib *etr_aib; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 684 | }; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 685 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 686 | static void clock_sync_cpu(struct clock_sync_data *sync) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 687 | { |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 688 | atomic_dec(&sync->cpus); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 689 | enable_sync_clock(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 690 | /* |
| 691 | * This looks like a busy wait loop but it isn't. etr_sync_cpus |
| 692 | * is called on all other cpus while the TOD clocks is stopped. |
| 693 | * __udelay will stop the cpu on an enabled wait psw until the |
| 694 | * TOD is running again. |
| 695 | */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 696 | while (sync->in_sync == 0) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 697 | __udelay(1); |
Heiko Carstens | 6c732de | 2007-02-21 10:55:15 +0100 | [diff] [blame] | 698 | /* |
| 699 | * A different cpu changes *in_sync. Therefore use |
| 700 | * barrier() to force memory access. |
| 701 | */ |
| 702 | barrier(); |
| 703 | } |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 704 | if (sync->in_sync != 1) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 705 | /* Didn't work. Clear per-cpu in sync bit again. */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 706 | disable_sync_clock(NULL); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 707 | /* |
| 708 | * This round of TOD syncing is done. Set the clock comparator |
| 709 | * to the next tick and let the processor continue. |
| 710 | */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 711 | fixup_clock_comparator(sync->fixup_cc); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 712 | } |
| 713 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 714 | /* |
| 715 | * Sync the TOD clock using the port refered to by aibp. This port |
| 716 | * has to be enabled and the other port has to be disabled. The |
| 717 | * last eacr update has to be more than 1.6 seconds in the past. |
| 718 | */ |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 719 | static int etr_sync_clock(void *data) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 720 | { |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 721 | static int first; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 722 | unsigned long long clock, old_clock, delay, delta; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 723 | struct clock_sync_data *etr_sync; |
| 724 | struct etr_aib *sync_port, *aib; |
| 725 | int port; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 726 | int rc; |
| 727 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 728 | etr_sync = data; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 729 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 730 | if (xchg(&first, 1) == 1) { |
| 731 | /* Slave */ |
| 732 | clock_sync_cpu(etr_sync); |
| 733 | return 0; |
| 734 | } |
| 735 | |
| 736 | /* Wait until all other cpus entered the sync function. */ |
| 737 | while (atomic_read(&etr_sync->cpus) != 0) |
| 738 | cpu_relax(); |
| 739 | |
| 740 | port = etr_sync->etr_port; |
| 741 | aib = etr_sync->etr_aib; |
| 742 | sync_port = (port == 0) ? &etr_port0 : &etr_port1; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 743 | enable_sync_clock(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 744 | |
| 745 | /* Set clock to next OTE. */ |
| 746 | __ctl_set_bit(14, 21); |
| 747 | __ctl_set_bit(0, 29); |
| 748 | clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 749 | old_clock = get_clock(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 750 | if (set_clock(clock) == 0) { |
| 751 | __udelay(1); /* Wait for the clock to start. */ |
| 752 | __ctl_clear_bit(0, 29); |
| 753 | __ctl_clear_bit(14, 21); |
| 754 | etr_stetr(aib); |
| 755 | /* Adjust Linux timing variables. */ |
| 756 | delay = (unsigned long long) |
| 757 | (aib->edf2.etv - sync_port->edf2.etv) << 32; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 758 | delta = adjust_time(old_clock, clock, delay); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 759 | etr_sync->fixup_cc = delta; |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 760 | fixup_clock_comparator(delta); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 761 | /* Verify that the clock is properly set. */ |
| 762 | if (!etr_aib_follows(sync_port, aib, port)) { |
| 763 | /* Didn't work. */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 764 | disable_sync_clock(NULL); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 765 | etr_sync->in_sync = -EAGAIN; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 766 | rc = -EAGAIN; |
| 767 | } else { |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 768 | etr_sync->in_sync = 1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 769 | rc = 0; |
| 770 | } |
| 771 | } else { |
| 772 | /* Could not set the clock ?!? */ |
| 773 | __ctl_clear_bit(0, 29); |
| 774 | __ctl_clear_bit(14, 21); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 775 | disable_sync_clock(NULL); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 776 | etr_sync->in_sync = -EAGAIN; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 777 | rc = -EAGAIN; |
| 778 | } |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 779 | xchg(&first, 0); |
| 780 | return rc; |
| 781 | } |
| 782 | |
| 783 | static int etr_sync_clock_stop(struct etr_aib *aib, int port) |
| 784 | { |
| 785 | struct clock_sync_data etr_sync; |
| 786 | struct etr_aib *sync_port; |
| 787 | int follows; |
| 788 | int rc; |
| 789 | |
| 790 | /* Check if the current aib is adjacent to the sync port aib. */ |
| 791 | sync_port = (port == 0) ? &etr_port0 : &etr_port1; |
| 792 | follows = etr_aib_follows(sync_port, aib, port); |
| 793 | memcpy(sync_port, aib, sizeof(*aib)); |
| 794 | if (!follows) |
| 795 | return -EAGAIN; |
| 796 | memset(&etr_sync, 0, sizeof(etr_sync)); |
| 797 | etr_sync.etr_aib = aib; |
| 798 | etr_sync.etr_port = port; |
| 799 | get_online_cpus(); |
| 800 | atomic_set(&etr_sync.cpus, num_online_cpus() - 1); |
| 801 | rc = stop_machine(etr_sync_clock, &etr_sync, &cpu_online_map); |
| 802 | put_online_cpus(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 803 | return rc; |
| 804 | } |
| 805 | |
| 806 | /* |
| 807 | * Handle the immediate effects of the different events. |
| 808 | * The port change event is used for online/offline changes. |
| 809 | */ |
| 810 | static struct etr_eacr etr_handle_events(struct etr_eacr eacr) |
| 811 | { |
| 812 | if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events)) |
| 813 | eacr.es = 0; |
| 814 | if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events)) |
| 815 | eacr.es = eacr.sl = 0; |
| 816 | if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events)) |
| 817 | etr_port0_uptodate = etr_port1_uptodate = 0; |
| 818 | |
| 819 | if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) { |
| 820 | if (eacr.e0) |
| 821 | /* |
| 822 | * Port change of an enabled port. We have to |
| 823 | * assume that this can have caused an stepping |
| 824 | * port switch. |
| 825 | */ |
| 826 | etr_tolec = get_clock(); |
| 827 | eacr.p0 = etr_port0_online; |
| 828 | if (!eacr.p0) |
| 829 | eacr.e0 = 0; |
| 830 | etr_port0_uptodate = 0; |
| 831 | } |
| 832 | if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) { |
| 833 | if (eacr.e1) |
| 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.p1 = etr_port1_online; |
| 841 | if (!eacr.p1) |
| 842 | eacr.e1 = 0; |
| 843 | etr_port1_uptodate = 0; |
| 844 | } |
| 845 | clear_bit(ETR_EVENT_UPDATE, &etr_events); |
| 846 | return eacr; |
| 847 | } |
| 848 | |
| 849 | /* |
| 850 | * Set up a timer that expires after the etr_tolec + 1.6 seconds if |
| 851 | * one of the ports needs an update. |
| 852 | */ |
| 853 | static void etr_set_tolec_timeout(unsigned long long now) |
| 854 | { |
| 855 | unsigned long micros; |
| 856 | |
| 857 | if ((!etr_eacr.p0 || etr_port0_uptodate) && |
| 858 | (!etr_eacr.p1 || etr_port1_uptodate)) |
| 859 | return; |
| 860 | micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0; |
| 861 | micros = (micros > 1600000) ? 0 : 1600000 - micros; |
| 862 | mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1); |
| 863 | } |
| 864 | |
| 865 | /* |
| 866 | * Set up a time that expires after 1/2 second. |
| 867 | */ |
| 868 | static void etr_set_sync_timeout(void) |
| 869 | { |
| 870 | mod_timer(&etr_timer, jiffies + HZ/2); |
| 871 | } |
| 872 | |
| 873 | /* |
| 874 | * Update the aib information for one or both ports. |
| 875 | */ |
| 876 | static struct etr_eacr etr_handle_update(struct etr_aib *aib, |
| 877 | struct etr_eacr eacr) |
| 878 | { |
| 879 | /* With both ports disabled the aib information is useless. */ |
| 880 | if (!eacr.e0 && !eacr.e1) |
| 881 | return eacr; |
| 882 | |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 883 | /* Update port0 or port1 with aib stored in etr_work_fn. */ |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 884 | if (aib->esw.q == 0) { |
| 885 | /* Information for port 0 stored. */ |
| 886 | if (eacr.p0 && !etr_port0_uptodate) { |
| 887 | etr_port0 = *aib; |
| 888 | if (etr_port0_online) |
| 889 | etr_port0_uptodate = 1; |
| 890 | } |
| 891 | } else { |
| 892 | /* Information for port 1 stored. */ |
| 893 | if (eacr.p1 && !etr_port1_uptodate) { |
| 894 | etr_port1 = *aib; |
| 895 | if (etr_port0_online) |
| 896 | etr_port1_uptodate = 1; |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | /* |
| 901 | * Do not try to get the alternate port aib if the clock |
| 902 | * is not in sync yet. |
| 903 | */ |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 904 | if (!check_sync_clock()) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 905 | return eacr; |
| 906 | |
| 907 | /* |
| 908 | * If steai is available we can get the information about |
| 909 | * the other port immediately. If only stetr is available the |
| 910 | * data-port bit toggle has to be used. |
| 911 | */ |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 912 | if (etr_steai_available) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 913 | if (eacr.p0 && !etr_port0_uptodate) { |
| 914 | etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0); |
| 915 | etr_port0_uptodate = 1; |
| 916 | } |
| 917 | if (eacr.p1 && !etr_port1_uptodate) { |
| 918 | etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1); |
| 919 | etr_port1_uptodate = 1; |
| 920 | } |
| 921 | } else { |
| 922 | /* |
| 923 | * One port was updated above, if the other |
| 924 | * port is not uptodate toggle dp bit. |
| 925 | */ |
| 926 | if ((eacr.p0 && !etr_port0_uptodate) || |
| 927 | (eacr.p1 && !etr_port1_uptodate)) |
| 928 | eacr.dp ^= 1; |
| 929 | else |
| 930 | eacr.dp = 0; |
| 931 | } |
| 932 | return eacr; |
| 933 | } |
| 934 | |
| 935 | /* |
| 936 | * Write new etr control register if it differs from the current one. |
| 937 | * Return 1 if etr_tolec has been updated as well. |
| 938 | */ |
| 939 | static void etr_update_eacr(struct etr_eacr eacr) |
| 940 | { |
| 941 | int dp_changed; |
| 942 | |
| 943 | if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0) |
| 944 | /* No change, return. */ |
| 945 | return; |
| 946 | /* |
| 947 | * The disable of an active port of the change of the data port |
| 948 | * bit can/will cause a change in the data port. |
| 949 | */ |
| 950 | dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 || |
| 951 | (etr_eacr.dp ^ eacr.dp) != 0; |
| 952 | etr_eacr = eacr; |
| 953 | etr_setr(&etr_eacr); |
| 954 | if (dp_changed) |
| 955 | etr_tolec = get_clock(); |
| 956 | } |
| 957 | |
| 958 | /* |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 959 | * ETR work. In this function you'll find the main logic. In |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 960 | * particular this is the only function that calls etr_update_eacr(), |
| 961 | * it "controls" the etr control register. |
| 962 | */ |
Martin Schwidefsky | ecdcc02 | 2007-04-27 16:01:58 +0200 | [diff] [blame] | 963 | static void etr_work_fn(struct work_struct *work) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 964 | { |
| 965 | unsigned long long now; |
| 966 | struct etr_eacr eacr; |
| 967 | struct etr_aib aib; |
| 968 | int sync_port; |
| 969 | |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 970 | /* prevent multiple execution. */ |
| 971 | mutex_lock(&etr_work_mutex); |
| 972 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 973 | /* Create working copy of etr_eacr. */ |
| 974 | eacr = etr_eacr; |
| 975 | |
| 976 | /* Check for the different events and their immediate effects. */ |
| 977 | eacr = etr_handle_events(eacr); |
| 978 | |
| 979 | /* Check if ETR is supposed to be active. */ |
| 980 | eacr.ea = eacr.p0 || eacr.p1; |
| 981 | if (!eacr.ea) { |
| 982 | /* Both ports offline. Reset everything. */ |
| 983 | eacr.dp = eacr.es = eacr.sl = 0; |
Ingo Molnar | 1a781a7 | 2008-07-15 21:55:59 +0200 | [diff] [blame] | 984 | on_each_cpu(disable_sync_clock, NULL, 1); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 985 | del_timer_sync(&etr_timer); |
| 986 | etr_update_eacr(eacr); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 987 | goto out_unlock; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 988 | } |
| 989 | |
| 990 | /* Store aib to get the current ETR status word. */ |
| 991 | BUG_ON(etr_stetr(&aib) != 0); |
| 992 | etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */ |
| 993 | now = get_clock(); |
| 994 | |
| 995 | /* |
| 996 | * Update the port information if the last stepping port change |
| 997 | * or data port change is older than 1.6 seconds. |
| 998 | */ |
| 999 | if (now >= etr_tolec + (1600000 << 12)) |
| 1000 | eacr = etr_handle_update(&aib, eacr); |
| 1001 | |
| 1002 | /* |
| 1003 | * Select ports to enable. The prefered synchronization mode is PPS. |
| 1004 | * If a port can be enabled depends on a number of things: |
| 1005 | * 1) The port needs to be online and uptodate. A port is not |
| 1006 | * disabled just because it is not uptodate, but it is only |
| 1007 | * enabled if it is uptodate. |
| 1008 | * 2) The port needs to have the same mode (pps / etr). |
| 1009 | * 3) The port needs to be usable -> etr_port_valid() == 1 |
| 1010 | * 4) To enable the second port the clock needs to be in sync. |
| 1011 | * 5) If both ports are useable and are ETR ports, the network id |
| 1012 | * has to be the same. |
| 1013 | * The eacr.sl bit is used to indicate etr mode vs. pps mode. |
| 1014 | */ |
| 1015 | if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) { |
| 1016 | eacr.sl = 0; |
| 1017 | eacr.e0 = 1; |
| 1018 | if (!etr_mode_is_pps(etr_eacr)) |
| 1019 | eacr.es = 0; |
| 1020 | if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode) |
| 1021 | eacr.e1 = 0; |
| 1022 | // FIXME: uptodate checks ? |
| 1023 | else if (etr_port0_uptodate && etr_port1_uptodate) |
| 1024 | eacr.e1 = 1; |
| 1025 | sync_port = (etr_port0_uptodate && |
| 1026 | etr_port_valid(&etr_port0, 0)) ? 0 : -1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1027 | } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) { |
| 1028 | eacr.sl = 0; |
| 1029 | eacr.e0 = 0; |
| 1030 | eacr.e1 = 1; |
| 1031 | if (!etr_mode_is_pps(etr_eacr)) |
| 1032 | eacr.es = 0; |
| 1033 | sync_port = (etr_port1_uptodate && |
| 1034 | etr_port_valid(&etr_port1, 1)) ? 1 : -1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1035 | } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) { |
| 1036 | eacr.sl = 1; |
| 1037 | eacr.e0 = 1; |
| 1038 | if (!etr_mode_is_etr(etr_eacr)) |
| 1039 | eacr.es = 0; |
| 1040 | if (!eacr.es || !eacr.p1 || |
| 1041 | aib.esw.psc1 != etr_lpsc_operational_alt) |
| 1042 | eacr.e1 = 0; |
| 1043 | else if (etr_port0_uptodate && etr_port1_uptodate && |
| 1044 | etr_compare_network(&etr_port0, &etr_port1)) |
| 1045 | eacr.e1 = 1; |
| 1046 | sync_port = (etr_port0_uptodate && |
| 1047 | etr_port_valid(&etr_port0, 0)) ? 0 : -1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1048 | } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) { |
| 1049 | eacr.sl = 1; |
| 1050 | eacr.e0 = 0; |
| 1051 | eacr.e1 = 1; |
| 1052 | if (!etr_mode_is_etr(etr_eacr)) |
| 1053 | eacr.es = 0; |
| 1054 | sync_port = (etr_port1_uptodate && |
| 1055 | etr_port_valid(&etr_port1, 1)) ? 1 : -1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1056 | } else { |
| 1057 | /* Both ports not usable. */ |
| 1058 | eacr.es = eacr.sl = 0; |
| 1059 | sync_port = -1; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1060 | } |
| 1061 | |
| 1062 | /* |
| 1063 | * If the clock is in sync just update the eacr and return. |
| 1064 | * If there is no valid sync port wait for a port update. |
| 1065 | */ |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 1066 | if (check_sync_clock() || sync_port < 0) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1067 | etr_update_eacr(eacr); |
| 1068 | etr_set_tolec_timeout(now); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1069 | goto out_unlock; |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1070 | } |
| 1071 | |
| 1072 | /* |
| 1073 | * Prepare control register for clock syncing |
| 1074 | * (reset data port bit, set sync check control. |
| 1075 | */ |
| 1076 | eacr.dp = 0; |
| 1077 | eacr.es = 1; |
| 1078 | |
| 1079 | /* |
| 1080 | * Update eacr and try to synchronize the clock. If the update |
| 1081 | * of eacr caused a stepping port switch (or if we have to |
| 1082 | * assume that a stepping port switch has occured) or the |
| 1083 | * clock syncing failed, reset the sync check control bit |
| 1084 | * and set up a timer to try again after 0.5 seconds |
| 1085 | */ |
| 1086 | etr_update_eacr(eacr); |
| 1087 | if (now < etr_tolec + (1600000 << 12) || |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1088 | etr_sync_clock_stop(&aib, sync_port) != 0) { |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1089 | /* Sync failed. Try again in 1/2 second. */ |
| 1090 | eacr.es = 0; |
| 1091 | etr_update_eacr(eacr); |
| 1092 | etr_set_sync_timeout(); |
| 1093 | } else |
| 1094 | etr_set_tolec_timeout(now); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1095 | out_unlock: |
| 1096 | mutex_unlock(&etr_work_mutex); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1097 | } |
| 1098 | |
| 1099 | /* |
| 1100 | * Sysfs interface functions |
| 1101 | */ |
| 1102 | static struct sysdev_class etr_sysclass = { |
Kay Sievers | af5ca3f | 2007-12-20 02:09:39 +0100 | [diff] [blame] | 1103 | .name = "etr", |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1104 | }; |
| 1105 | |
| 1106 | static struct sys_device etr_port0_dev = { |
| 1107 | .id = 0, |
| 1108 | .cls = &etr_sysclass, |
| 1109 | }; |
| 1110 | |
| 1111 | static struct sys_device etr_port1_dev = { |
| 1112 | .id = 1, |
| 1113 | .cls = &etr_sysclass, |
| 1114 | }; |
| 1115 | |
| 1116 | /* |
| 1117 | * ETR class attributes |
| 1118 | */ |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1119 | static ssize_t etr_stepping_port_show(struct sysdev_class *class, |
| 1120 | struct sysdev_class_attribute *attr, |
| 1121 | char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1122 | { |
| 1123 | return sprintf(buf, "%i\n", etr_port0.esw.p); |
| 1124 | } |
| 1125 | |
| 1126 | static SYSDEV_CLASS_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL); |
| 1127 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1128 | static ssize_t etr_stepping_mode_show(struct sysdev_class *class, |
| 1129 | struct sysdev_class_attribute *attr, |
| 1130 | char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1131 | { |
| 1132 | char *mode_str; |
| 1133 | |
| 1134 | if (etr_mode_is_pps(etr_eacr)) |
| 1135 | mode_str = "pps"; |
| 1136 | else if (etr_mode_is_etr(etr_eacr)) |
| 1137 | mode_str = "etr"; |
| 1138 | else |
| 1139 | mode_str = "local"; |
| 1140 | return sprintf(buf, "%s\n", mode_str); |
| 1141 | } |
| 1142 | |
| 1143 | static SYSDEV_CLASS_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL); |
| 1144 | |
| 1145 | /* |
| 1146 | * ETR port attributes |
| 1147 | */ |
| 1148 | static inline struct etr_aib *etr_aib_from_dev(struct sys_device *dev) |
| 1149 | { |
| 1150 | if (dev == &etr_port0_dev) |
| 1151 | return etr_port0_online ? &etr_port0 : NULL; |
| 1152 | else |
| 1153 | return etr_port1_online ? &etr_port1 : NULL; |
| 1154 | } |
| 1155 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1156 | static ssize_t etr_online_show(struct sys_device *dev, |
| 1157 | struct sysdev_attribute *attr, |
| 1158 | char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1159 | { |
| 1160 | unsigned int online; |
| 1161 | |
| 1162 | online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online; |
| 1163 | return sprintf(buf, "%i\n", online); |
| 1164 | } |
| 1165 | |
| 1166 | static ssize_t etr_online_store(struct sys_device *dev, |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1167 | struct sysdev_attribute *attr, |
| 1168 | const char *buf, size_t count) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1169 | { |
| 1170 | unsigned int value; |
| 1171 | |
| 1172 | value = simple_strtoul(buf, NULL, 0); |
| 1173 | if (value != 0 && value != 1) |
| 1174 | return -EINVAL; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1175 | if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags)) |
| 1176 | return -EOPNOTSUPP; |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 1177 | mutex_lock(&clock_sync_mutex); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1178 | if (dev == &etr_port0_dev) { |
| 1179 | if (etr_port0_online == value) |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 1180 | goto out; /* Nothing to do. */ |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1181 | etr_port0_online = value; |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 1182 | if (etr_port0_online && etr_port1_online) |
| 1183 | set_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
| 1184 | else |
| 1185 | clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1186 | set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1187 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1188 | } else { |
| 1189 | if (etr_port1_online == value) |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 1190 | goto out; /* Nothing to do. */ |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1191 | etr_port1_online = value; |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 1192 | if (etr_port0_online && etr_port1_online) |
| 1193 | set_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
| 1194 | else |
| 1195 | clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1196 | set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1197 | queue_work(time_sync_wq, &etr_work); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1198 | } |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 1199 | out: |
| 1200 | mutex_unlock(&clock_sync_mutex); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1201 | return count; |
| 1202 | } |
| 1203 | |
| 1204 | static SYSDEV_ATTR(online, 0600, etr_online_show, etr_online_store); |
| 1205 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1206 | static ssize_t etr_stepping_control_show(struct sys_device *dev, |
| 1207 | struct sysdev_attribute *attr, |
| 1208 | char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1209 | { |
| 1210 | return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ? |
| 1211 | etr_eacr.e0 : etr_eacr.e1); |
| 1212 | } |
| 1213 | |
| 1214 | static SYSDEV_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL); |
| 1215 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1216 | static ssize_t etr_mode_code_show(struct sys_device *dev, |
| 1217 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1218 | { |
| 1219 | if (!etr_port0_online && !etr_port1_online) |
| 1220 | /* Status word is not uptodate if both ports are offline. */ |
| 1221 | return -ENODATA; |
| 1222 | return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ? |
| 1223 | etr_port0.esw.psc0 : etr_port0.esw.psc1); |
| 1224 | } |
| 1225 | |
| 1226 | static SYSDEV_ATTR(state_code, 0400, etr_mode_code_show, NULL); |
| 1227 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1228 | static ssize_t etr_untuned_show(struct sys_device *dev, |
| 1229 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1230 | { |
| 1231 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1232 | |
| 1233 | if (!aib || !aib->slsw.v1) |
| 1234 | return -ENODATA; |
| 1235 | return sprintf(buf, "%i\n", aib->edf1.u); |
| 1236 | } |
| 1237 | |
| 1238 | static SYSDEV_ATTR(untuned, 0400, etr_untuned_show, NULL); |
| 1239 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1240 | static ssize_t etr_network_id_show(struct sys_device *dev, |
| 1241 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1242 | { |
| 1243 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1244 | |
| 1245 | if (!aib || !aib->slsw.v1) |
| 1246 | return -ENODATA; |
| 1247 | return sprintf(buf, "%i\n", aib->edf1.net_id); |
| 1248 | } |
| 1249 | |
| 1250 | static SYSDEV_ATTR(network, 0400, etr_network_id_show, NULL); |
| 1251 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1252 | static ssize_t etr_id_show(struct sys_device *dev, |
| 1253 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1254 | { |
| 1255 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1256 | |
| 1257 | if (!aib || !aib->slsw.v1) |
| 1258 | return -ENODATA; |
| 1259 | return sprintf(buf, "%i\n", aib->edf1.etr_id); |
| 1260 | } |
| 1261 | |
| 1262 | static SYSDEV_ATTR(id, 0400, etr_id_show, NULL); |
| 1263 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1264 | static ssize_t etr_port_number_show(struct sys_device *dev, |
| 1265 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1266 | { |
| 1267 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1268 | |
| 1269 | if (!aib || !aib->slsw.v1) |
| 1270 | return -ENODATA; |
| 1271 | return sprintf(buf, "%i\n", aib->edf1.etr_pn); |
| 1272 | } |
| 1273 | |
| 1274 | static SYSDEV_ATTR(port, 0400, etr_port_number_show, NULL); |
| 1275 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1276 | static ssize_t etr_coupled_show(struct sys_device *dev, |
| 1277 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1278 | { |
| 1279 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1280 | |
| 1281 | if (!aib || !aib->slsw.v3) |
| 1282 | return -ENODATA; |
| 1283 | return sprintf(buf, "%i\n", aib->edf3.c); |
| 1284 | } |
| 1285 | |
| 1286 | static SYSDEV_ATTR(coupled, 0400, etr_coupled_show, NULL); |
| 1287 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1288 | static ssize_t etr_local_time_show(struct sys_device *dev, |
| 1289 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1290 | { |
| 1291 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1292 | |
| 1293 | if (!aib || !aib->slsw.v3) |
| 1294 | return -ENODATA; |
| 1295 | return sprintf(buf, "%i\n", aib->edf3.blto); |
| 1296 | } |
| 1297 | |
| 1298 | static SYSDEV_ATTR(local_time, 0400, etr_local_time_show, NULL); |
| 1299 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 1300 | static ssize_t etr_utc_offset_show(struct sys_device *dev, |
| 1301 | struct sysdev_attribute *attr, char *buf) |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 1302 | { |
| 1303 | struct etr_aib *aib = etr_aib_from_dev(dev); |
| 1304 | |
| 1305 | if (!aib || !aib->slsw.v3) |
| 1306 | return -ENODATA; |
| 1307 | return sprintf(buf, "%i\n", aib->edf3.buo); |
| 1308 | } |
| 1309 | |
| 1310 | static SYSDEV_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL); |
| 1311 | |
| 1312 | static struct sysdev_attribute *etr_port_attributes[] = { |
| 1313 | &attr_online, |
| 1314 | &attr_stepping_control, |
| 1315 | &attr_state_code, |
| 1316 | &attr_untuned, |
| 1317 | &attr_network, |
| 1318 | &attr_id, |
| 1319 | &attr_port, |
| 1320 | &attr_coupled, |
| 1321 | &attr_local_time, |
| 1322 | &attr_utc_offset, |
| 1323 | NULL |
| 1324 | }; |
| 1325 | |
| 1326 | static int __init etr_register_port(struct sys_device *dev) |
| 1327 | { |
| 1328 | struct sysdev_attribute **attr; |
| 1329 | int rc; |
| 1330 | |
| 1331 | rc = sysdev_register(dev); |
| 1332 | if (rc) |
| 1333 | goto out; |
| 1334 | for (attr = etr_port_attributes; *attr; attr++) { |
| 1335 | rc = sysdev_create_file(dev, *attr); |
| 1336 | if (rc) |
| 1337 | goto out_unreg; |
| 1338 | } |
| 1339 | return 0; |
| 1340 | out_unreg: |
| 1341 | for (; attr >= etr_port_attributes; attr--) |
| 1342 | sysdev_remove_file(dev, *attr); |
| 1343 | sysdev_unregister(dev); |
| 1344 | out: |
| 1345 | return rc; |
| 1346 | } |
| 1347 | |
| 1348 | static void __init etr_unregister_port(struct sys_device *dev) |
| 1349 | { |
| 1350 | struct sysdev_attribute **attr; |
| 1351 | |
| 1352 | for (attr = etr_port_attributes; *attr; attr++) |
| 1353 | sysdev_remove_file(dev, *attr); |
| 1354 | sysdev_unregister(dev); |
| 1355 | } |
| 1356 | |
| 1357 | static int __init etr_init_sysfs(void) |
| 1358 | { |
| 1359 | int rc; |
| 1360 | |
| 1361 | rc = sysdev_class_register(&etr_sysclass); |
| 1362 | if (rc) |
| 1363 | goto out; |
| 1364 | rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_port); |
| 1365 | if (rc) |
| 1366 | goto out_unreg_class; |
| 1367 | rc = sysdev_class_create_file(&etr_sysclass, &attr_stepping_mode); |
| 1368 | if (rc) |
| 1369 | goto out_remove_stepping_port; |
| 1370 | rc = etr_register_port(&etr_port0_dev); |
| 1371 | if (rc) |
| 1372 | goto out_remove_stepping_mode; |
| 1373 | rc = etr_register_port(&etr_port1_dev); |
| 1374 | if (rc) |
| 1375 | goto out_remove_port0; |
| 1376 | return 0; |
| 1377 | |
| 1378 | out_remove_port0: |
| 1379 | etr_unregister_port(&etr_port0_dev); |
| 1380 | out_remove_stepping_mode: |
| 1381 | sysdev_class_remove_file(&etr_sysclass, &attr_stepping_mode); |
| 1382 | out_remove_stepping_port: |
| 1383 | sysdev_class_remove_file(&etr_sysclass, &attr_stepping_port); |
| 1384 | out_unreg_class: |
| 1385 | sysdev_class_unregister(&etr_sysclass); |
| 1386 | out: |
| 1387 | return rc; |
| 1388 | } |
| 1389 | |
| 1390 | device_initcall(etr_init_sysfs); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1391 | |
| 1392 | /* |
| 1393 | * Server Time Protocol (STP) code. |
| 1394 | */ |
| 1395 | static int stp_online; |
| 1396 | static struct stp_sstpi stp_info; |
| 1397 | static void *stp_page; |
| 1398 | |
| 1399 | static void stp_work_fn(struct work_struct *work); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1400 | static DEFINE_MUTEX(stp_work_mutex); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1401 | static DECLARE_WORK(stp_work, stp_work_fn); |
Martin Schwidefsky | 0436230 | 2009-04-14 15:36:19 +0200 | [diff] [blame] | 1402 | static struct timer_list stp_timer; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1403 | |
| 1404 | static int __init early_parse_stp(char *p) |
| 1405 | { |
| 1406 | if (strncmp(p, "off", 3) == 0) |
| 1407 | stp_online = 0; |
| 1408 | else if (strncmp(p, "on", 2) == 0) |
| 1409 | stp_online = 1; |
| 1410 | return 0; |
| 1411 | } |
| 1412 | early_param("stp", early_parse_stp); |
| 1413 | |
| 1414 | /* |
| 1415 | * Reset STP attachment. |
| 1416 | */ |
Heiko Carstens | 8f84700 | 2008-08-01 16:39:19 +0200 | [diff] [blame] | 1417 | static void __init stp_reset(void) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1418 | { |
| 1419 | int rc; |
| 1420 | |
Heiko Carstens | d7d1104 | 2009-06-22 12:08:03 +0200 | [diff] [blame] | 1421 | stp_page = (void *) get_zeroed_page(GFP_ATOMIC); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1422 | rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000); |
Martin Schwidefsky | 4a672cf | 2008-10-10 21:33:29 +0200 | [diff] [blame] | 1423 | if (rc == 0) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1424 | set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags); |
| 1425 | else if (stp_online) { |
Martin Schwidefsky | feab650 | 2008-12-25 13:39:38 +0100 | [diff] [blame] | 1426 | pr_warning("The real or virtual hardware system does " |
| 1427 | "not provide an STP interface\n"); |
Heiko Carstens | d7d1104 | 2009-06-22 12:08:03 +0200 | [diff] [blame] | 1428 | free_page((unsigned long) stp_page); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1429 | stp_page = NULL; |
| 1430 | stp_online = 0; |
| 1431 | } |
| 1432 | } |
| 1433 | |
Martin Schwidefsky | 0436230 | 2009-04-14 15:36:19 +0200 | [diff] [blame] | 1434 | static void stp_timeout(unsigned long dummy) |
| 1435 | { |
| 1436 | queue_work(time_sync_wq, &stp_work); |
| 1437 | } |
| 1438 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 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; |
Martin Schwidefsky | 0436230 | 2009-04-14 15:36:19 +0200 | [diff] [blame] | 1443 | setup_timer(&stp_timer, stp_timeout, 0UL); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1444 | time_init_wq(); |
| 1445 | if (!stp_online) |
| 1446 | return 0; |
| 1447 | queue_work(time_sync_wq, &stp_work); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1448 | return 0; |
| 1449 | } |
| 1450 | |
| 1451 | arch_initcall(stp_init); |
| 1452 | |
| 1453 | /* |
| 1454 | * STP timing alert. There are three causes: |
| 1455 | * 1) timing status change |
| 1456 | * 2) link availability change |
| 1457 | * 3) time control parameter change |
| 1458 | * In all three cases we are only interested in the clock source state. |
| 1459 | * If a STP clock source is now available use it. |
| 1460 | */ |
| 1461 | static void stp_timing_alert(struct stp_irq_parm *intparm) |
| 1462 | { |
| 1463 | if (intparm->tsc || intparm->lac || intparm->tcpc) |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1464 | queue_work(time_sync_wq, &stp_work); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1465 | } |
| 1466 | |
| 1467 | /* |
| 1468 | * STP sync check machine check. This is called when the timing state |
| 1469 | * changes from the synchronized state to the unsynchronized state. |
| 1470 | * After a STP sync check the clock is not in sync. The machine check |
| 1471 | * is broadcasted to all cpus at the same time. |
| 1472 | */ |
| 1473 | void stp_sync_check(void) |
| 1474 | { |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1475 | disable_sync_clock(NULL); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1476 | queue_work(time_sync_wq, &stp_work); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1477 | } |
| 1478 | |
| 1479 | /* |
| 1480 | * STP island condition machine check. This is called when an attached |
| 1481 | * server attempts to communicate over an STP link and the servers |
| 1482 | * have matching CTN ids and have a valid stratum-1 configuration |
| 1483 | * but the configurations do not match. |
| 1484 | */ |
| 1485 | void stp_island_check(void) |
| 1486 | { |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1487 | disable_sync_clock(NULL); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1488 | queue_work(time_sync_wq, &stp_work); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1489 | } |
| 1490 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1491 | |
| 1492 | static int stp_sync_clock(void *data) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1493 | { |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1494 | static int first; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1495 | unsigned long long old_clock, delta; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1496 | struct clock_sync_data *stp_sync; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1497 | int rc; |
| 1498 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1499 | stp_sync = data; |
| 1500 | |
| 1501 | if (xchg(&first, 1) == 1) { |
| 1502 | /* Slave */ |
| 1503 | clock_sync_cpu(stp_sync); |
| 1504 | return 0; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1505 | } |
| 1506 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1507 | /* Wait until all other cpus entered the sync function. */ |
| 1508 | while (atomic_read(&stp_sync->cpus) != 0) |
| 1509 | cpu_relax(); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1510 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1511 | enable_sync_clock(); |
| 1512 | |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1513 | rc = 0; |
| 1514 | if (stp_info.todoff[0] || stp_info.todoff[1] || |
| 1515 | stp_info.todoff[2] || stp_info.todoff[3] || |
| 1516 | stp_info.tmd != 2) { |
| 1517 | old_clock = get_clock(); |
| 1518 | rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0); |
| 1519 | if (rc == 0) { |
| 1520 | delta = adjust_time(old_clock, get_clock(), 0); |
| 1521 | fixup_clock_comparator(delta); |
| 1522 | rc = chsc_sstpi(stp_page, &stp_info, |
| 1523 | sizeof(struct stp_sstpi)); |
| 1524 | if (rc == 0 && stp_info.tmd != 2) |
| 1525 | rc = -EAGAIN; |
| 1526 | } |
| 1527 | } |
| 1528 | if (rc) { |
| 1529 | disable_sync_clock(NULL); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1530 | stp_sync->in_sync = -EAGAIN; |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1531 | } else |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1532 | stp_sync->in_sync = 1; |
| 1533 | xchg(&first, 0); |
| 1534 | return 0; |
| 1535 | } |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1536 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1537 | /* |
| 1538 | * STP work. Check for the STP state and take over the clock |
| 1539 | * synchronization if the STP clock source is usable. |
| 1540 | */ |
| 1541 | static void stp_work_fn(struct work_struct *work) |
| 1542 | { |
| 1543 | struct clock_sync_data stp_sync; |
| 1544 | int rc; |
| 1545 | |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1546 | /* prevent multiple execution. */ |
| 1547 | mutex_lock(&stp_work_mutex); |
| 1548 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1549 | if (!stp_online) { |
| 1550 | chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000); |
Martin Schwidefsky | 0436230 | 2009-04-14 15:36:19 +0200 | [diff] [blame] | 1551 | del_timer_sync(&stp_timer); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1552 | goto out_unlock; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1553 | } |
| 1554 | |
| 1555 | rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0); |
| 1556 | if (rc) |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1557 | goto out_unlock; |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1558 | |
| 1559 | rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi)); |
| 1560 | if (rc || stp_info.c == 0) |
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 | |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 1563 | /* Skip synchronization if the clock is already in sync. */ |
| 1564 | if (check_sync_clock()) |
| 1565 | goto out_unlock; |
| 1566 | |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1567 | memset(&stp_sync, 0, sizeof(stp_sync)); |
| 1568 | get_online_cpus(); |
| 1569 | atomic_set(&stp_sync.cpus, num_online_cpus() - 1); |
| 1570 | stop_machine(stp_sync_clock, &stp_sync, &cpu_online_map); |
| 1571 | put_online_cpus(); |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1572 | |
Martin Schwidefsky | 0436230 | 2009-04-14 15:36:19 +0200 | [diff] [blame] | 1573 | if (!check_sync_clock()) |
| 1574 | /* |
| 1575 | * There is a usable clock but the synchonization failed. |
| 1576 | * Retry after a second. |
| 1577 | */ |
| 1578 | mod_timer(&stp_timer, jiffies + HZ); |
| 1579 | |
Martin Schwidefsky | 0b3016b | 2008-12-25 13:38:38 +0100 | [diff] [blame] | 1580 | out_unlock: |
| 1581 | mutex_unlock(&stp_work_mutex); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1582 | } |
| 1583 | |
| 1584 | /* |
| 1585 | * STP class sysfs interface functions |
| 1586 | */ |
| 1587 | static struct sysdev_class stp_sysclass = { |
| 1588 | .name = "stp", |
| 1589 | }; |
| 1590 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1591 | static ssize_t stp_ctn_id_show(struct sysdev_class *class, |
| 1592 | struct sysdev_class_attribute *attr, |
| 1593 | char *buf) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1594 | { |
| 1595 | if (!stp_online) |
| 1596 | return -ENODATA; |
| 1597 | return sprintf(buf, "%016llx\n", |
| 1598 | *(unsigned long long *) stp_info.ctnid); |
| 1599 | } |
| 1600 | |
| 1601 | static SYSDEV_CLASS_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL); |
| 1602 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1603 | static ssize_t stp_ctn_type_show(struct sysdev_class *class, |
| 1604 | struct sysdev_class_attribute *attr, |
| 1605 | char *buf) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1606 | { |
| 1607 | if (!stp_online) |
| 1608 | return -ENODATA; |
| 1609 | return sprintf(buf, "%i\n", stp_info.ctn); |
| 1610 | } |
| 1611 | |
| 1612 | static SYSDEV_CLASS_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL); |
| 1613 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1614 | static ssize_t stp_dst_offset_show(struct sysdev_class *class, |
| 1615 | struct sysdev_class_attribute *attr, |
| 1616 | char *buf) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1617 | { |
| 1618 | if (!stp_online || !(stp_info.vbits & 0x2000)) |
| 1619 | return -ENODATA; |
| 1620 | return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto); |
| 1621 | } |
| 1622 | |
| 1623 | static SYSDEV_CLASS_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL); |
| 1624 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1625 | static ssize_t stp_leap_seconds_show(struct sysdev_class *class, |
| 1626 | struct sysdev_class_attribute *attr, |
| 1627 | char *buf) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1628 | { |
| 1629 | if (!stp_online || !(stp_info.vbits & 0x8000)) |
| 1630 | return -ENODATA; |
| 1631 | return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps); |
| 1632 | } |
| 1633 | |
| 1634 | static SYSDEV_CLASS_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL); |
| 1635 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1636 | static ssize_t stp_stratum_show(struct sysdev_class *class, |
| 1637 | struct sysdev_class_attribute *attr, |
| 1638 | char *buf) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1639 | { |
| 1640 | if (!stp_online) |
| 1641 | return -ENODATA; |
| 1642 | return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum); |
| 1643 | } |
| 1644 | |
| 1645 | static SYSDEV_CLASS_ATTR(stratum, 0400, stp_stratum_show, NULL); |
| 1646 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1647 | static ssize_t stp_time_offset_show(struct sysdev_class *class, |
| 1648 | struct sysdev_class_attribute *attr, |
| 1649 | char *buf) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1650 | { |
| 1651 | if (!stp_online || !(stp_info.vbits & 0x0800)) |
| 1652 | return -ENODATA; |
| 1653 | return sprintf(buf, "%i\n", (int) stp_info.tto); |
| 1654 | } |
| 1655 | |
| 1656 | static SYSDEV_CLASS_ATTR(time_offset, 0400, stp_time_offset_show, NULL); |
| 1657 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1658 | static ssize_t stp_time_zone_offset_show(struct sysdev_class *class, |
| 1659 | struct sysdev_class_attribute *attr, |
| 1660 | char *buf) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1661 | { |
| 1662 | if (!stp_online || !(stp_info.vbits & 0x4000)) |
| 1663 | return -ENODATA; |
| 1664 | return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo); |
| 1665 | } |
| 1666 | |
| 1667 | static SYSDEV_CLASS_ATTR(time_zone_offset, 0400, |
| 1668 | stp_time_zone_offset_show, NULL); |
| 1669 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1670 | static ssize_t stp_timing_mode_show(struct sysdev_class *class, |
| 1671 | struct sysdev_class_attribute *attr, |
| 1672 | char *buf) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1673 | { |
| 1674 | if (!stp_online) |
| 1675 | return -ENODATA; |
| 1676 | return sprintf(buf, "%i\n", stp_info.tmd); |
| 1677 | } |
| 1678 | |
| 1679 | static SYSDEV_CLASS_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL); |
| 1680 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1681 | static ssize_t stp_timing_state_show(struct sysdev_class *class, |
| 1682 | struct sysdev_class_attribute *attr, |
| 1683 | char *buf) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1684 | { |
| 1685 | if (!stp_online) |
| 1686 | return -ENODATA; |
| 1687 | return sprintf(buf, "%i\n", stp_info.tst); |
| 1688 | } |
| 1689 | |
| 1690 | static SYSDEV_CLASS_ATTR(timing_state, 0400, stp_timing_state_show, NULL); |
| 1691 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1692 | static ssize_t stp_online_show(struct sysdev_class *class, |
| 1693 | struct sysdev_class_attribute *attr, |
| 1694 | char *buf) |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1695 | { |
| 1696 | return sprintf(buf, "%i\n", stp_online); |
| 1697 | } |
| 1698 | |
| 1699 | static ssize_t stp_online_store(struct sysdev_class *class, |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1700 | struct sysdev_class_attribute *attr, |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1701 | const char *buf, size_t count) |
| 1702 | { |
| 1703 | unsigned int value; |
| 1704 | |
| 1705 | value = simple_strtoul(buf, NULL, 0); |
| 1706 | if (value != 0 && value != 1) |
| 1707 | return -EINVAL; |
| 1708 | if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags)) |
| 1709 | return -EOPNOTSUPP; |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 1710 | mutex_lock(&clock_sync_mutex); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1711 | stp_online = value; |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 1712 | if (stp_online) |
| 1713 | set_bit(CLOCK_SYNC_STP, &clock_sync_flags); |
| 1714 | else |
| 1715 | clear_bit(CLOCK_SYNC_STP, &clock_sync_flags); |
Heiko Carstens | 750887d | 2008-12-25 13:38:37 +0100 | [diff] [blame] | 1716 | queue_work(time_sync_wq, &stp_work); |
Martin Schwidefsky | 8283cb4 | 2009-03-26 15:24:21 +0100 | [diff] [blame] | 1717 | mutex_unlock(&clock_sync_mutex); |
Martin Schwidefsky | d2fec59 | 2008-07-14 09:58:56 +0200 | [diff] [blame] | 1718 | return count; |
| 1719 | } |
| 1720 | |
| 1721 | /* |
| 1722 | * Can't use SYSDEV_CLASS_ATTR because the attribute should be named |
| 1723 | * stp/online but attr_online already exists in this file .. |
| 1724 | */ |
| 1725 | static struct sysdev_class_attribute attr_stp_online = { |
| 1726 | .attr = { .name = "online", .mode = 0600 }, |
| 1727 | .show = stp_online_show, |
| 1728 | .store = stp_online_store, |
| 1729 | }; |
| 1730 | |
| 1731 | static struct sysdev_class_attribute *stp_attributes[] = { |
| 1732 | &attr_ctn_id, |
| 1733 | &attr_ctn_type, |
| 1734 | &attr_dst_offset, |
| 1735 | &attr_leap_seconds, |
| 1736 | &attr_stp_online, |
| 1737 | &attr_stratum, |
| 1738 | &attr_time_offset, |
| 1739 | &attr_time_zone_offset, |
| 1740 | &attr_timing_mode, |
| 1741 | &attr_timing_state, |
| 1742 | NULL |
| 1743 | }; |
| 1744 | |
| 1745 | static int __init stp_init_sysfs(void) |
| 1746 | { |
| 1747 | struct sysdev_class_attribute **attr; |
| 1748 | int rc; |
| 1749 | |
| 1750 | rc = sysdev_class_register(&stp_sysclass); |
| 1751 | if (rc) |
| 1752 | goto out; |
| 1753 | for (attr = stp_attributes; *attr; attr++) { |
| 1754 | rc = sysdev_class_create_file(&stp_sysclass, *attr); |
| 1755 | if (rc) |
| 1756 | goto out_unreg; |
| 1757 | } |
| 1758 | return 0; |
| 1759 | out_unreg: |
| 1760 | for (; attr >= stp_attributes; attr--) |
| 1761 | sysdev_class_remove_file(&stp_sysclass, *attr); |
| 1762 | sysdev_class_unregister(&stp_sysclass); |
| 1763 | out: |
| 1764 | return rc; |
| 1765 | } |
| 1766 | |
| 1767 | device_initcall(stp_init_sysfs); |