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x86, olpc: Add XO-1 RTC driver

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Add a driver to configure the XO-1 RTC via CS5536 MSRs, to be used as a
system wakeup source via olpc-xo1-pm.

Device detection is based on finding the relevant device tree node.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-11-git-send-email-dsd@laptop.org
Acked-by: Andres Salomon <dilinger@queued.net>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: devicetree-discuss@lists.ozlabs.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Daniel Drake 2011-06-25 17:34:17 +01:00 • committed by H. Peter Anvin
parent e1040ac693
commit cfee95977b
5 changed files with 99 additions and 0 deletions
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5
include/linux/cs5535.h
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@ -40,6 +40,10 @@
#define MSR_MFGPT_NR 0x51400029
#define MSR_MFGPT_SETUP 0x5140002B
#define MSR_RTC_DOMA_OFFSET 0x51400055
#define MSR_RTC_MONA_OFFSET 0x51400056
#define MSR_RTC_CEN_OFFSET 0x51400057
#define MSR_LX_SPARE_MSR 0x80000011 /* DC-specific */
#define MSR_GX_GLD_MSR_CONFIG 0xC0002001
@ -95,6 +99,7 @@ static inline int cs5535_pic_unreqz_select_high(unsigned int group,
/* CS5536_PM1_EN bits */
#define CS5536_PM_PWRBTN (1 << 8)
#define CS5536_PM_RTC (1 << 10)
/* CS5536_PM_GPE0_STS bits */
#define CS5536_GPIOM7_PME_FLAG (1 << 31)