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Subject[PATCH 2/8] sh: sh03: rtc: push down rtc class ops into driver
Date
The dreamcast RTC support has an extra level of indirection to
provide either the old read_persistent_clock/update_persistent_clock
interface or the rtc-generic device for hctosys/systohc.

By removing the indirection and always using the RTC_CLASS interface,
we can avoid the lossy double conversion between rtc_time and timespec,
so we end up supporting the entire range of 'year' values, and clarifying
the rtc_set_time callback.

I did not change the behavior of sh03_rtc_settimeofday(), which keeps
just updating the seconds/minutes by calling set_rtc_mmss(), this
could be improved if anyone cares. Also, the file should ideally be
moved into drivers/rtc and not use rtc-generic.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/sh/boards/mach-sh03/Makefile | 3 +-
arch/sh/boards/mach-sh03/rtc.c | 51 +++++++++++++++++++------------
arch/sh/boards/mach-sh03/setup.c | 9 ------
arch/sh/configs/sh03_defconfig | 2 ++
4 files changed, 35 insertions(+), 30 deletions(-)

diff --git a/arch/sh/boards/mach-sh03/Makefile b/arch/sh/boards/mach-sh03/Makefile
index 400306a796ec..47007a3a2fc8 100644
--- a/arch/sh/boards/mach-sh03/Makefile
+++ b/arch/sh/boards/mach-sh03/Makefile
@@ -2,4 +2,5 @@
# Makefile for the Interface (CTP/PCI-SH03) specific parts of the kernel
#

-obj-y := setup.o rtc.o
+obj-y := setup.o
+obj-$(CONFIG_RTC_DRV_GENERIC) += rtc.o
diff --git a/arch/sh/boards/mach-sh03/rtc.c b/arch/sh/boards/mach-sh03/rtc.c
index dc3d50e3b7a2..8b23ed7c201c 100644
--- a/arch/sh/boards/mach-sh03/rtc.c
+++ b/arch/sh/boards/mach-sh03/rtc.c
@@ -13,8 +13,9 @@
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/spinlock.h>
-#include <asm/io.h>
-#include <asm/rtc.h>
+#include <linux/io.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>

#define RTC_BASE 0xb0000000
#define RTC_SEC1 (RTC_BASE + 0)
@@ -38,7 +39,7 @@

static DEFINE_SPINLOCK(sh03_rtc_lock);

-unsigned long get_cmos_time(void)
+static int sh03_rtc_gettimeofday(struct device *dev, struct rtc_time *tm)
{
unsigned int year, mon, day, hour, min, sec;

@@ -75,17 +76,18 @@ unsigned long get_cmos_time(void)
}

spin_unlock(&sh03_rtc_lock);
- return mktime(year, mon, day, hour, min, sec);
-}

-void sh03_rtc_gettimeofday(struct timespec *tv)
-{
+ tm->tm_sec = sec;
+ tm->tm_min = min;
+ tm->tm_hour = hour;
+ tm->tm_mday = day;
+ tm->tm_mon = mon;
+ tm->tm_year = year - 1900;

- tv->tv_sec = get_cmos_time();
- tv->tv_nsec = 0;
+ return 0;
}

-static int set_rtc_mmss(unsigned long nowtime)
+static int set_rtc_mmss(struct rtc_time *tm)
{
int retval = 0;
int real_seconds, real_minutes, cmos_minutes;
@@ -97,8 +99,8 @@ static int set_rtc_mmss(unsigned long nowtime)
if (!(__raw_readb(RTC_CTL) & RTC_BUSY))
break;
cmos_minutes = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10;
- real_seconds = nowtime % 60;
- real_minutes = nowtime / 60;
+ real_seconds = tm->tm_sec;
+ real_minutes = tm->tm_min;
if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
real_minutes += 30; /* correct for half hour time zone */
real_minutes %= 60;
@@ -112,22 +114,31 @@ static int set_rtc_mmss(unsigned long nowtime)
printk_once(KERN_NOTICE
"set_rtc_mmss: can't update from %d to %d\n",
cmos_minutes, real_minutes);
- retval = -1;
+ retval = -EINVAL;
}
spin_unlock(&sh03_rtc_lock);

return retval;
}

-int sh03_rtc_settimeofday(const time_t secs)
+int sh03_rtc_settimeofday(struct device *dev, struct rtc_time *tm)
{
- unsigned long nowtime = secs;
-
- return set_rtc_mmss(nowtime);
+ return set_rtc_mmss(tm);
}

-void sh03_time_init(void)
+static const struct rtc_class_ops rtc_generic_ops = {
+ .read_time = sh03_rtc_gettimeofday,
+ .set_time = sh03_rtc_settimeofday,
+};
+
+static int __init sh03_time_init(void)
{
- rtc_sh_get_time = sh03_rtc_gettimeofday;
- rtc_sh_set_time = sh03_rtc_settimeofday;
+ struct platform_device *pdev;
+
+ pdev = platform_device_register_data(NULL, "rtc-generic", -1,
+ &rtc_generic_ops,
+ sizeof(rtc_generic_ops));
+
+ return PTR_ERR_OR_ZERO(pdev);
}
+arch_initcall(sh03_time_init);
diff --git a/arch/sh/boards/mach-sh03/setup.c b/arch/sh/boards/mach-sh03/setup.c
index 85e7059a77e9..3901b6031ad5 100644
--- a/arch/sh/boards/mach-sh03/setup.c
+++ b/arch/sh/boards/mach-sh03/setup.c
@@ -22,14 +22,6 @@ static void __init init_sh03_IRQ(void)
plat_irq_setup_pins(IRQ_MODE_IRQ);
}

-/* arch/sh/boards/sh03/rtc.c */
-void sh03_time_init(void);
-
-static void __init sh03_setup(char **cmdline_p)
-{
- board_time_init = sh03_time_init;
-}
-
static struct resource cf_ide_resources[] = {
[0] = {
.start = 0x1f0,
@@ -101,6 +93,5 @@ device_initcall(sh03_devices_setup);

static struct sh_machine_vector mv_sh03 __initmv = {
.mv_name = "Interface (CTP/PCI-SH03)",
- .mv_setup = sh03_setup,
.mv_init_irq = init_sh03_IRQ,
};
diff --git a/arch/sh/configs/sh03_defconfig b/arch/sh/configs/sh03_defconfig
index 2156223405a1..489ffdfb1517 100644
--- a/arch/sh/configs/sh03_defconfig
+++ b/arch/sh/configs/sh03_defconfig
@@ -130,3 +130,5 @@ CONFIG_CRYPTO_SHA1=y
CONFIG_CRYPTO_DEFLATE=y
# CONFIG_CRYPTO_ANSI_CPRNG is not set
CONFIG_CRC_CCITT=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_GENERIC=y
--
2.18.0
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