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// SPDX-License-Identifier: Apache-2.0
/*
* Talk to a Real Time Clock (RTC) over IPMI
*
* Copyright 2013-2015 IBM Corp.
*/
#include <stdlib.h>
#include <string.h>
#include <ipmi.h>
#include <time.h>
#include <time-utils.h>
#include <device.h>
#include <opal.h>
#include <rtc.h>
static enum {idle, waiting, updated, error} time_status;
static void get_sel_time_error(struct ipmi_msg *msg)
{
time_status = error;
ipmi_free_msg(msg);
}
static void get_sel_time_complete(struct ipmi_msg *msg)
{
struct tm tm;
le32 result;
time_t time;
memcpy(&result, msg->data, 4);
time = le32_to_cpu(result);
gmtime_r(&time, &tm);
rtc_cache_update(&tm);
time_status = updated;
ipmi_free_msg(msg);
}
static int64_t ipmi_get_sel_time(void)
{
struct ipmi_msg *msg;
msg = ipmi_mkmsg(IPMI_DEFAULT_INTERFACE, IPMI_GET_SEL_TIME,
get_sel_time_complete, NULL, NULL, 0, 4);
if (!msg)
return OPAL_HARDWARE;
msg->error = get_sel_time_error;
return ipmi_queue_msg(msg);
}
static int64_t ipmi_set_sel_time(uint32_t _tv)
{
struct ipmi_msg *msg;
const le32 tv = cpu_to_le32(_tv);
msg = ipmi_mkmsg_simple(IPMI_SET_SEL_TIME, (void*)&tv, sizeof(tv));
if (!msg)
return OPAL_HARDWARE;
return ipmi_queue_msg(msg);
}
static int64_t ipmi_opal_rtc_read(uint32_t *y_m_d,
uint64_t *h_m_s_m)
{
int ret = 0;
if (!y_m_d || !h_m_s_m)
return OPAL_PARAMETER;
switch(time_status) {
case idle:
if (ipmi_get_sel_time() < 0)
return OPAL_HARDWARE;
time_status = waiting;
ret = OPAL_BUSY_EVENT;
break;
case waiting:
ret = OPAL_BUSY_EVENT;
break;
case updated:
rtc_cache_get_datetime(y_m_d, h_m_s_m);
time_status = idle;
ret = OPAL_SUCCESS;
break;
case error:
time_status = idle;
ret = OPAL_HARDWARE;
break;
}
return ret;
}
static int64_t ipmi_opal_rtc_write(uint32_t year_month_day,
uint64_t hour_minute_second_millisecond)
{
time_t t;
struct tm tm;
datetime_to_tm(year_month_day, hour_minute_second_millisecond, &tm);
t = mktime(&tm);
if (ipmi_set_sel_time(t))
return OPAL_HARDWARE;
return OPAL_SUCCESS;
}
void ipmi_rtc_init(void)
{
struct dt_node *np = dt_new(opal_node, "rtc");
dt_add_property_strings(np, "compatible", "ibm,opal-rtc");
opal_register(OPAL_RTC_READ, ipmi_opal_rtc_read, 2);
opal_register(OPAL_RTC_WRITE, ipmi_opal_rtc_write, 2);
/* Initialise the rtc cache */
ipmi_get_sel_time();
}
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