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macintosh: Use common code to access RTC

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Now that the 68k Mac port has adopted the via-pmu driver, the same RTC
code can be shared between m68k and powerpc. Replace duplicated code in
arch/powerpc and arch/m68k with common RTC accessors for Cuda and PMU.

Drop the problematic WARN_ON which was introduced in commit 22db552b50
("powerpc/powermac: Fix rtc read/write functions").

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Finn Thain
2018-09-11 20:18:44 -04:00
committed by Michael Ellerman
parent 053c5a753e
commit 0792a2c8e0
6 changed files with 106 additions and 171 deletions
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35
drivers/macintosh/via-cuda.c
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@@ -766,3 +766,38 @@ cuda_input(unsigned char *buf, int nb)
buf, nb, false);
}
}
/* Offset between Unix time (1970-based) and Mac time (1904-based) */
#define RTC_OFFSET 2082844800
time64_t cuda_get_time(void)
{
struct adb_request req;
u32 now;
if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
return 0;
while (!req.complete)
cuda_poll();
if (req.reply_len != 7)
pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
now = (req.reply[3] << 24) + (req.reply[4] << 16) +
(req.reply[5] << 8) + req.reply[6];
return (time64_t)now - RTC_OFFSET;
}
int cuda_set_rtc_time(struct rtc_time *tm)
{
u32 now;
struct adb_request req;
now = lower_32_bits(rtc_tm_to_time64(tm) + RTC_OFFSET);
if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
now >> 24, now >> 16, now >> 8, now) < 0)
return -ENXIO;
while (!req.complete)
cuda_poll();
if ((req.reply_len != 3) && (req.reply_len != 7))
pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
return 0;
}