char/genrtc: remove mn10300 support

The genrtc driver serves no purpose on mn10300 because it drives the
same hardware as the original rtc.c driver, and the newer rtc-generic.c
or rtc-cmos.c drivers on architectures that use the asm-generic/rtc.h
header.

I assume it was initially only added for completeness when the
mn10300 port was done, but the older rtc.c driver was always used
instead.

We can also stop include asm-generic/rtc.h now, because we
just call mc146818_set_time() directly.

It would be nice to change the architecture to use the rtc-cmos driver
next, and remove support for the old rtc driver as well.

[linux@roeck-us.net: Add missing include file to proc-init.c]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/mn10300/include/asm/rtc.h

@@ -25,6 +25,4 @@ static inline void calibrate_clock(void)
 
 #endif /* !CONFIG_MN10300_RTC */
 
-#include <asm-generic/rtc.h>
-
 #endif /* _ASM_RTC_H */

arch/mn10300/kernel/rtc.c

@@ -27,7 +27,7 @@ void read_persistent_clock(struct timespec *ts)
 {
 	struct rtc_time tm;
 
-	get_rtc_time(&tm);
+	mc146818_set_time(&tm);
 
 	ts->tv_nsec = 0;
 	ts->tv_sec = mktime(tm.tm_year, tm.tm_mon, tm.tm_mday,

arch/mn10300/proc-mn103e010/proc-init.c

@@ -9,7 +9,9 @@
  * 2 of the Licence, or (at your option) any later version.
  */
 #include <linux/kernel.h>
+#include <asm/cacheflush.h>
 #include <asm/fpu.h>
+#include <asm/irq.h>
 #include <asm/rtc.h>
 #include <asm/busctl-regs.h>
 

arch/mn10300/proc-mn2ws0050/proc-init.c

@@ -14,6 +14,7 @@
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 
+#include <asm/cacheflush.h>
 #include <asm/processor.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>

drivers/char/Kconfig

@@ -328,7 +328,7 @@ config JS_RTC
 config GEN_RTC
 	tristate "Generic /dev/rtc emulation"
 	depends on RTC!=y
-	depends on M68K || MN10300 || PARISC || PPC
+	depends on M68K || PARISC || PPC
 	---help---
 	  If you say Y here and create a character special file /dev/rtc with
 	  major number 10 and minor number 135 using mknod ("man mknod"), you