diff options
Diffstat (limited to 'hw/fake-rtc.c')
-rw-r--r-- | hw/fake-rtc.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/hw/fake-rtc.c b/hw/fake-rtc.c new file mode 100644 index 00000000..2aadfa09 --- /dev/null +++ b/hw/fake-rtc.c @@ -0,0 +1,69 @@ +/* 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> + +//#define DBG(fmt...) printf("FAKERTC: " fmt) +#define DBG(fmt...) do { } while(0) + +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) { + DBG("No initial RTC value found\n"); + return; + } + + rtc = (uint32_t *) rtc_region->start; + + fake_ymd = rtc; + fake_hmsm = ((uint64_t *) &rtc[1]); + + DBG("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); +} |