Release 4.14 arch/powerpc/kernel/rtas-rtc.c
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/ratelimit.h>
#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/time.h>
#define MAX_RTC_WAIT 5000
/* 5 sec */
#define RTAS_CLOCK_BUSY (-2)
unsigned long __init rtas_get_boot_time(void)
{
int ret[8];
int error;
unsigned int wait_time;
u64 max_wait_tb;
max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
do {
error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);
wait_time = rtas_busy_delay_time(error);
if (wait_time) {
/* This is boot time so we spin. */
udelay(wait_time*1000);
}
} while (wait_time && (get_tb() < max_wait_tb));
if (error != 0) {
printk_ratelimited(KERN_WARNING
"error: reading the clock failed (%d)\n",
error);
return 0;
}
return mktime(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Benjamin Herrenschmidt | 129 | 91.49% | 1 | 25.00% |
| John Rose | 10 | 7.09% | 1 | 25.00% |
| Paul Mackerras | 1 | 0.71% | 1 | 25.00% |
| Christian Dietrich | 1 | 0.71% | 1 | 25.00% |
| Total | 141 | 100.00% | 4 | 100.00% |
/* NOTE: get_rtc_time will get an error if executed in interrupt context
* and if a delay is needed to read the clock. In this case we just
* silently return without updating rtc_tm.
*/
void rtas_get_rtc_time(struct rtc_time *rtc_tm)
{
int ret[8];
int error;
unsigned int wait_time;
u64 max_wait_tb;
max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
do {
error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);
wait_time = rtas_busy_delay_time(error);
if (wait_time) {
if (in_interrupt()) {
memset(rtc_tm, 0, sizeof(struct rtc_time));
printk_ratelimited(KERN_WARNING
"error: reading clock "
"would delay interrupt\n");
return; /* delay not allowed */
}
msleep(wait_time);
}
} while (wait_time && (get_tb() < max_wait_tb));
if (error != 0) {
printk_ratelimited(KERN_WARNING
"error: reading the clock failed (%d)\n",
error);
return;
}
rtc_tm->tm_sec = ret[5];
rtc_tm->tm_min = ret[4];
rtc_tm->tm_hour = ret[3];
rtc_tm->tm_mday = ret[2];
rtc_tm->tm_mon = ret[1] - 1;
rtc_tm->tm_year = ret[0] - 1900;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Benjamin Herrenschmidt | 174 | 91.58% | 1 | 25.00% |
| John Rose | 11 | 5.79% | 1 | 25.00% |
| Christian Dietrich | 4 | 2.11% | 1 | 25.00% |
| Paul Mackerras | 1 | 0.53% | 1 | 25.00% |
| Total | 190 | 100.00% | 4 | 100.00% |
int rtas_set_rtc_time(struct rtc_time *tm)
{
int error, wait_time;
u64 max_wait_tb;
max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
do {
error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL,
tm->tm_year + 1900, tm->tm_mon + 1,
tm->tm_mday, tm->tm_hour, tm->tm_min,
tm->tm_sec, 0);
wait_time = rtas_busy_delay_time(error);
if (wait_time) {
if (in_interrupt())
return 1; /* probably decrementer */
msleep(wait_time);
}
} while (wait_time && (get_tb() < max_wait_tb));
if (error != 0)
printk_ratelimited(KERN_WARNING
"error: setting the clock failed (%d)\n",
error);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Benjamin Herrenschmidt | 124 | 92.54% | 1 | 25.00% |
| John Rose | 8 | 5.97% | 1 | 25.00% |
| Christian Dietrich | 1 | 0.75% | 1 | 25.00% |
| Paul Mackerras | 1 | 0.75% | 1 | 25.00% |
| Total | 134 | 100.00% | 4 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Benjamin Herrenschmidt | 464 | 91.70% | 1 | 20.00% |
| John Rose | 29 | 5.73% | 1 | 20.00% |
| Christian Dietrich | 9 | 1.78% | 1 | 20.00% |
| Paul Mackerras | 3 | 0.59% | 1 | 20.00% |
| Greg Kroah-Hartman | 1 | 0.20% | 1 | 20.00% |
| Total | 506 | 100.00% | 5 | 100.00% |
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