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/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <skiboot.h>
#include <opal.h>
#include <mem_region.h>
uint32_t *fake_ymd;
uint64_t *fake_hmsm;
static int64_t fake_rtc_write(uint32_t ymd, uint64_t hmsm)
{
*fake_ymd = ymd;
*fake_hmsm = hmsm;
return OPAL_SUCCESS;
}
static int64_t fake_rtc_read(uint32_t *ymd, uint64_t *hmsm)
{
if (!ymd || !hmsm)
return OPAL_PARAMETER;
*ymd = *fake_ymd;
*hmsm = *fake_hmsm;
return OPAL_SUCCESS;
}
void fake_rtc_init(void)
{
struct mem_region *rtc_region = NULL;
uint32_t *rtc = NULL;
/* Read initial values from reserved memory */
rtc_region = find_mem_region("ibm,fake-rtc");
/* Should we register anyway? */
if (!rtc_region) {
prlog(PR_TRACE, "No initial RTC value found\n");
return;
}
rtc = (uint32_t *) rtc_region->start;
fake_ymd = rtc;
fake_hmsm = ((uint64_t *) &rtc[1]);
prlog(PR_TRACE, "Init fake RTC to 0x%x 0x%llx\n",
*fake_ymd, *fake_hmsm);
opal_register(OPAL_RTC_READ, fake_rtc_read, 2);
opal_register(OPAL_RTC_WRITE, fake_rtc_write, 2);
}
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