diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-01 10:53:43 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-01 10:53:43 -0700 |
commit | 00e9028a95fb8a4d79f2fb695a853f33ea7d3b57 (patch) | |
tree | 2dea2ae498a6ce57de8890e87185aca5e9f3ad2d /arch/sh/boards/mach-dreamcast/rtc.c | |
parent | 57b1494d2ba544c62673234da6115c21fac27ffc (diff) | |
parent | 7cb93181629c613ee2b8f4ffe3446f8003074842 (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6: (28 commits)
mm/hugetlb.c must #include <asm/io.h>
video: Fix up hp6xx driver build regressions.
sh: defconfig updates.
sh: Kill off stray mach-rsk7203 reference.
serial: sh-sci: Fix up SH7760/SH7780/SH7785 early printk regression.
sh: Move out individual boards without mach groups.
sh: Make sure AT_SYSINFO_EHDR is exposed to userspace in asm/auxvec.h.
sh: Allow SH-3 and SH-5 to use common headers.
sh: Provide common CPU headers, prune the SH-2 and SH-2A directories.
sh/maple: clean maple bus code
sh: More header path fixups for mach dir refactoring.
sh: Move out the solution engine headers to arch/sh/include/mach-se/
sh: I2C fix for AP325RXA and Migo-R
sh: Shuffle the board directories in to mach groups.
sh: dma-sh: Fix up dreamcast dma.h mach path.
sh: Switch KBUILD_DEFCONFIG to shx3_defconfig.
sh: Add ARCH_DEFCONFIG entries for sh and sh64.
sh: Fix compile error of Solution Engine
sh: Proper __put_user_asm() size mismatch fix.
sh: Stub in a dummy ENTRY_OFFSET for uImage offset calculation.
...
Diffstat (limited to 'arch/sh/boards/mach-dreamcast/rtc.c')
-rw-r--r-- | arch/sh/boards/mach-dreamcast/rtc.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/arch/sh/boards/mach-dreamcast/rtc.c b/arch/sh/boards/mach-dreamcast/rtc.c new file mode 100644 index 00000000000..a7433685798 --- /dev/null +++ b/arch/sh/boards/mach-dreamcast/rtc.c @@ -0,0 +1,81 @@ +/* + * arch/sh/boards/dreamcast/rtc.c + * + * Dreamcast AICA RTC routines. + * + * Copyright (c) 2001, 2002 M. R. Brown <mrbrown@0xd6.org> + * Copyright (c) 2002 Paul Mundt <lethal@chaoticdreams.org> + * + * Released under the terms of the GNU GPL v2.0. + * + */ + +#include <linux/time.h> +#include <asm/rtc.h> +#include <asm/io.h> + +/* The AICA RTC has an Epoch of 1/1/1950, so we must subtract 20 years (in + seconds) to get the standard Unix Epoch when getting the time, and add + 20 years when setting the time. */ +#define TWENTY_YEARS ((20 * 365LU + 5) * 86400) + +/* The AICA RTC is represented by a 32-bit seconds counter stored in 2 16-bit + registers.*/ +#define AICA_RTC_SECS_H 0xa0710000 +#define AICA_RTC_SECS_L 0xa0710004 + +/** + * aica_rtc_gettimeofday - Get the time from the AICA RTC + * @ts: pointer to resulting timespec + * + * Grabs the current RTC seconds counter and adjusts it to the Unix Epoch. + */ +static void aica_rtc_gettimeofday(struct timespec *ts) +{ + unsigned long val1, val2; + + do { + val1 = ((ctrl_inl(AICA_RTC_SECS_H) & 0xffff) << 16) | + (ctrl_inl(AICA_RTC_SECS_L) & 0xffff); + + val2 = ((ctrl_inl(AICA_RTC_SECS_H) & 0xffff) << 16) | + (ctrl_inl(AICA_RTC_SECS_L) & 0xffff); + } while (val1 != val2); + + ts->tv_sec = val1 - TWENTY_YEARS; + + /* Can't get nanoseconds with just a seconds counter. */ + ts->tv_nsec = 0; +} + +/** + * aica_rtc_settimeofday - Set the AICA RTC to the current time + * @secs: contains the time_t to set + * + * Adjusts the given @tv to the AICA Epoch and sets the RTC seconds counter. + */ +static int aica_rtc_settimeofday(const time_t secs) +{ + unsigned long val1, val2; + unsigned long adj = secs + TWENTY_YEARS; + + do { + ctrl_outl((adj & 0xffff0000) >> 16, AICA_RTC_SECS_H); + ctrl_outl((adj & 0xffff), AICA_RTC_SECS_L); + + val1 = ((ctrl_inl(AICA_RTC_SECS_H) & 0xffff) << 16) | + (ctrl_inl(AICA_RTC_SECS_L) & 0xffff); + + val2 = ((ctrl_inl(AICA_RTC_SECS_H) & 0xffff) << 16) | + (ctrl_inl(AICA_RTC_SECS_L) & 0xffff); + } while (val1 != val2); + + return 0; +} + +void aica_time_init(void) +{ + rtc_sh_get_time = aica_rtc_gettimeofday; + rtc_sh_set_time = aica_rtc_settimeofday; +} + |