| 1 | |
| 2 | #include <linux/kernel.h>
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| 3 | #include <linux/time.h>
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| 4 | #include <linux/timer.h>
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| 5 | #include <linux/init.h>
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| 6 | #include <linux/rtc.h>
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| 7 | #include <linux/delay.h>
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| 8 | #include <linux/ratelimit.h>
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| 9 | #include <asm/rtas.h>
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| 10 | #include <asm/time.h>
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| 11 |
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| 12 |
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| 13 | #define MAX_RTC_WAIT 5000
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| 14 |
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| 15 | time64_t __init rtas_get_boot_time(void)
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| 16 | {
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| 17 | int ret[8];
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| 18 | int error;
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| 19 | unsigned int wait_time;
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| 20 | u64 max_wait_tb;
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| 21 |
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| 22 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
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| 23 | do {
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| 24 | error = rtas_call(rtas_function_token(RTAS_FN_GET_TIME_OF_DAY), 0, 8, ret);
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| 25 |
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| 26 | wait_time = rtas_busy_delay_time(error);
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| 27 | if (wait_time) {
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| 28 |
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| 29 | udelay(wait_time*1000);
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| 30 | }
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| 31 | } while (wait_time && (get_tb() < max_wait_tb));
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| 32 |
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| 33 | if (error != 0) {
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| 34 | printk_ratelimited(KERN_WARNING
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| 35 | "error: reading the clock failed (%d)\n",
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| 36 | error);
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| 37 | return 0;
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| 38 | }
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| 39 |
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| 40 | return mktime64(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]);
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| 41 | }
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| 42 |
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| 43 | |
| 44 | * and if a delay is needed to read the clock. In this case we just
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| 45 | * silently return without updating rtc_tm.
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| 46 |
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| 47 | void rtas_get_rtc_time(struct rtc_time *rtc_tm)
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| 48 | {
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| 49 | int ret[8];
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| 50 | int error;
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| 51 | unsigned int wait_time;
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| 52 | u64 max_wait_tb;
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| 53 |
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| 54 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
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| 55 | do {
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| 56 | error = rtas_call(rtas_function_token(RTAS_FN_GET_TIME_OF_DAY), 0, 8, ret);
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| 57 |
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| 58 | wait_time = rtas_busy_delay_time(error);
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| 59 | if (wait_time) {
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| 60 | if (in_interrupt()) {
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| 61 | memset(rtc_tm, 0, sizeof(struct rtc_time));
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| 62 | printk_ratelimited(KERN_WARNING
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| 63 | "error: reading clock "
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| 64 | "would delay interrupt\n");
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| 65 | return;
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| 66 | }
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| 67 | msleep(wait_time);
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| 68 | }
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| 69 | } while (wait_time && (get_tb() < max_wait_tb));
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| 70 |
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| 71 | if (error != 0) {
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| 72 | printk_ratelimited(KERN_WARNING
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| 73 | "error: reading the clock failed (%d)\n",
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| 74 | error);
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| 75 | return;
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| 76 | }
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| 77 |
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| 78 | rtc_tm->tm_sec = ret[5];
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| 79 | rtc_tm->tm_min = ret[4];
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| 80 | rtc_tm->tm_hour = ret[3];
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| 81 | rtc_tm->tm_mday = ret[2];
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| 82 | rtc_tm->tm_mon = ret[1] - 1;
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| 83 | rtc_tm->tm_year = ret[0] - 1900;
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| 84 | }
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| 85 |
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| 86 | int rtas_set_rtc_time(struct rtc_time *tm)
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| 87 | {
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| 88 | int error, wait_time;
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| 89 | u64 max_wait_tb;
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| 90 |
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| 91 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
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| 92 | do {
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| 93 | error = rtas_call(rtas_function_token(RTAS_FN_SET_TIME_OF_DAY), 7, 1, NULL,
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| 94 | tm->tm_year + 1900, tm->tm_mon + 1,
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| 95 | tm->tm_mday, tm->tm_hour, tm->tm_min,
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| 96 | tm->tm_sec, 0);
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| 97 |
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| 98 | wait_time = rtas_busy_delay_time(error);
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| 99 | if (wait_time) {
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| 100 | if (in_interrupt())
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| 101 | return 1;
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| 102 | msleep(wait_time);
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| 103 | }
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| 104 | } while (wait_time && (get_tb() < max_wait_tb));
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| 105 |
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| 106 | if (error != 0)
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| 107 | printk_ratelimited(KERN_WARNING
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| 108 | "error: setting the clock failed (%d)\n",
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| 109 | error);
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| 110 |
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| 111 | return 0;
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| 112 | }
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