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Message-Id: <20181207134824.300024-2-arnd@arndb.de>
Date: Fri, 7 Dec 2018 14:48:17 +0100
From: Arnd Bergmann <arnd@...db.de>
To: y2038@...ts.linaro.org
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-sh@...r.kernel.org, Baolin Wang <baolin.wang@...aro.org>,
Andrew Morton <akpm@...ux-foundation.org>,
John Stultz <john.stultz@...aro.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Thomas Gleixner <tglx@...utronix.de>,
Rich Felker <dalias@...c.org>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 1/8] sh: dreamcast: rtc: push down rtc class ops into driver
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.
Both do the same thing here, so we can do away with the abstraction
and simply enable the RTC core code to take care of it.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
arch/sh/boards/mach-dreamcast/Makefile | 4 +-
arch/sh/boards/mach-dreamcast/rtc.c | 39 +++++++++++++------
arch/sh/boards/mach-dreamcast/setup.c | 1 -
arch/sh/configs/dreamcast_defconfig | 2 +
arch/sh/include/mach-dreamcast/mach/sysasic.h | 1 -
5 files changed, 31 insertions(+), 16 deletions(-)
diff --git a/arch/sh/boards/mach-dreamcast/Makefile b/arch/sh/boards/mach-dreamcast/Makefile
index 7b97546c7e5f..62b024bc2a3e 100644
--- a/arch/sh/boards/mach-dreamcast/Makefile
+++ b/arch/sh/boards/mach-dreamcast/Makefile
@@ -2,5 +2,5 @@
# Makefile for the Sega Dreamcast specific parts of the kernel
#
-obj-y := setup.o irq.o rtc.o
-
+obj-y := setup.o irq.o
+obj-$(CONFIG_RTC_DRV_GENERIC) += rtc.o
diff --git a/arch/sh/boards/mach-dreamcast/rtc.c b/arch/sh/boards/mach-dreamcast/rtc.c
index 061d65714fcc..4f168d8d2951 100644
--- a/arch/sh/boards/mach-dreamcast/rtc.c
+++ b/arch/sh/boards/mach-dreamcast/rtc.c
@@ -11,8 +11,9 @@
*/
#include <linux/time.h>
-#include <asm/rtc.h>
-#include <asm/io.h>
+#include <linux/rtc.h>
+#include <linux/io.h>
+#include <linux/platform_device.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
@@ -30,9 +31,10 @@
*
* Grabs the current RTC seconds counter and adjusts it to the Unix Epoch.
*/
-static void aica_rtc_gettimeofday(struct timespec *ts)
+static int aica_rtc_gettimeofday(struct device *dev, struct rtc_time *tm)
{
unsigned long val1, val2;
+ time64_t t;
do {
val1 = ((__raw_readl(AICA_RTC_SECS_H) & 0xffff) << 16) |
@@ -42,10 +44,12 @@ static void aica_rtc_gettimeofday(struct timespec *ts)
(__raw_readl(AICA_RTC_SECS_L) & 0xffff);
} while (val1 != val2);
- ts->tv_sec = val1 - TWENTY_YEARS;
+ /* normalize to 1970..2106 time range */
+ t = (u32)(val1 - TWENTY_YEARS);
- /* Can't get nanoseconds with just a seconds counter. */
- ts->tv_nsec = 0;
+ rtc_time64_to_tm(t, tm);
+
+ return 0;
}
/**
@@ -54,10 +58,11 @@ static void aica_rtc_gettimeofday(struct timespec *ts)
*
* Adjusts the given @tv to the AICA Epoch and sets the RTC seconds counter.
*/
-static int aica_rtc_settimeofday(const time_t secs)
+static int aica_rtc_settimeofday(struct device *dev, struct rtc_time *tm)
{
unsigned long val1, val2;
- unsigned long adj = secs + TWENTY_YEARS;
+ time64_t secs = rtc_tm_to_time64(tm);
+ u32 adj = secs + TWENTY_YEARS;
do {
__raw_writel((adj & 0xffff0000) >> 16, AICA_RTC_SECS_H);
@@ -73,9 +78,19 @@ static int aica_rtc_settimeofday(const time_t secs)
return 0;
}
-void aica_time_init(void)
+static const struct rtc_class_ops rtc_generic_ops = {
+ .read_time = aica_rtc_gettimeofday,
+ .set_time = aica_rtc_settimeofday,
+};
+
+static int __init aica_time_init(void)
{
- rtc_sh_get_time = aica_rtc_gettimeofday;
- rtc_sh_set_time = aica_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(aica_time_init);
diff --git a/arch/sh/boards/mach-dreamcast/setup.c b/arch/sh/boards/mach-dreamcast/setup.c
index ad1a4db72e04..672c2ad8f8d5 100644
--- a/arch/sh/boards/mach-dreamcast/setup.c
+++ b/arch/sh/boards/mach-dreamcast/setup.c
@@ -30,7 +30,6 @@
static void __init dreamcast_setup(char **cmdline_p)
{
- board_time_init = aica_time_init;
}
static struct sh_machine_vector mv_dreamcast __initmv = {
diff --git a/arch/sh/configs/dreamcast_defconfig b/arch/sh/configs/dreamcast_defconfig
index 3f08dc54480b..1d27666c029f 100644
--- a/arch/sh/configs/dreamcast_defconfig
+++ b/arch/sh/configs/dreamcast_defconfig
@@ -70,3 +70,5 @@ CONFIG_PROC_KCORE=y
CONFIG_TMPFS=y
CONFIG_HUGETLBFS=y
# CONFIG_CRYPTO_ANSI_CPRNG is not set
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_GENERIC=y
diff --git a/arch/sh/include/mach-dreamcast/mach/sysasic.h b/arch/sh/include/mach-dreamcast/mach/sysasic.h
index 58f710e1ebc2..59effd1ed3e1 100644
--- a/arch/sh/include/mach-dreamcast/mach/sysasic.h
+++ b/arch/sh/include/mach-dreamcast/mach/sysasic.h
@@ -42,7 +42,6 @@
/* arch/sh/boards/mach-dreamcast/irq.c */
extern int systemasic_irq_demux(int);
extern void systemasic_irq_init(void);
-extern void aica_time_init(void);
#endif /* __ASM_SH_DREAMCAST_SYSASIC_H */
--
2.18.0
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