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author | millerjo@us.ibm.com <millerjo@us.ibm.com> | 2014-08-06 14:10:26 -0500 |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-08-08 16:07:26 +1000 |
commit | 6f1019e652c517cb825c09a03f52f420dc5e9002 (patch) | |
tree | 89dc1bc35fae4a610f78dbb77e64eebb154da7cb /hw/fake-rtc.c | |
parent | 82b53f9d1d22a184f5929e95032bab5ea4c0e6a8 (diff) | |
download | skiboot-6f1019e652c517cb825c09a03f52f420dc5e9002.zip skiboot-6f1019e652c517cb825c09a03f52f420dc5e9002.tar.gz skiboot-6f1019e652c517cb825c09a03f52f420dc5e9002.tar.bz2 |
Add fake RTC to generic platform
Adds a fake RTC that can be initialized via a named reserve in the
device tree that may, at some point, be on NVRAM.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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 0000000..2aadfa0 --- /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); +} |