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rtc: rtc-sh: Support 4-digit year on SH7705/SH7710/SH7712.

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All SH-4 parts have a 4-digit year, while the SH-3 parts typically
only use a 2-digit one. The SH7705, SH7710, and SH7712 SH-3 parts
however opted to extend it to 4-digit and still look and act like
an SH-3 RTC in all other ways.

This adds a capability flag (RTC_CAP_4_DIGIT_YEAR) that these
corner-case CPU subtypes can set in their platform data and cleans
up some of the ifdef mess in the driver as a result.

Reported-by: Markus Brunner <super.firetwister@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2007-08-03 14:19:58 +09:00
parent 7da3b8ef66
commit ad89f87a84
4 changed files with 58 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
drivers/rtc/rtc-sh.c
View File

@ -1,7 +1,7 @@
/*
* SuperH On-Chip RTC Support
*
* Copyright (C) 2006 Paul Mundt
* Copyright (C) 2006, 2007 Paul Mundt
* Copyright (C) 2006 Jamie Lenehan
*
* Based on the old arch/sh/kernel/cpu/rtc.c by:
@ -23,16 +23,19 @@
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <asm/rtc.h>
#define DRV_NAME "sh-rtc"
#define DRV_VERSION "0.1.2"
#define DRV_VERSION "0.1.3"
#ifdef CONFIG_CPU_SH3
#define rtc_reg_size sizeof(u16)
#define RTC_BIT_INVERTED 0 /* No bug on SH7708, SH7709A */
#define RTC_DEF_CAPABILITIES 0UL
#elif defined(CONFIG_CPU_SH4)
#define rtc_reg_size sizeof(u32)
#define RTC_BIT_INVERTED 0x40 /* bug on SH7750, SH7750S */
#define RTC_DEF_CAPABILITIES RTC_CAP_4_DIGIT_YEAR
#endif
#define RTC_REG(r) ((r) * rtc_reg_size)
@ -80,6 +83,7 @@ struct sh_rtc {
struct rtc_device *rtc_dev;
spinlock_t lock;
int rearm_aie;
unsigned long capabilities; /* See asm-sh/rtc.h for cap bits */
};
static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
@ -319,14 +323,14 @@ static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
tm->tm_mday = BCD2BIN(readb(rtc->regbase + RDAYCNT));
tm->tm_mon = BCD2BIN(readb(rtc->regbase + RMONCNT)) - 1;
#if defined(CONFIG_CPU_SH4)
yr = readw(rtc->regbase + RYRCNT);
yr100 = BCD2BIN(yr >> 8);
yr &= 0xff;
#else
yr = readb(rtc->regbase + RYRCNT);
yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
#endif
if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
yr = readw(rtc->regbase + RYRCNT);
yr100 = BCD2BIN(yr >> 8);
yr &= 0xff;
} else {
yr = readb(rtc->regbase + RYRCNT);
yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
}
tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
@ -375,14 +379,14 @@ static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
writeb(BIN2BCD(tm->tm_mon + 1), rtc->regbase + RMONCNT);
#ifdef CONFIG_CPU_SH3
year = tm->tm_year % 100;
writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
#else
year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
BIN2BCD(tm->tm_year % 100);
writew(year, rtc->regbase + RYRCNT);
#endif
if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
BIN2BCD(tm->tm_year % 100);
writew(year, rtc->regbase + RYRCNT);
} else {
year = tm->tm_year % 100;
writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
}
/* Start RTC */
tmp = readb(rtc->regbase + RCR2);
@ -589,6 +593,17 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev)
goto err_badmap;
}
rtc->capabilities = RTC_DEF_CAPABILITIES;
if (pdev->dev.platform_data) {
struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
/*
* Some CPUs have special capabilities in addition to the
* default set. Add those in here.
*/
rtc->capabilities |= pinfo->capabilities;
}
platform_set_drvdata(pdev, rtc);
return 0;