sh: remove old CMT driver

This patch removes the old CMT driver (CONFIG_SH_CMT/timer-cmt.c)

As replacement, select the sh_cmt driver with CONFIG_SH_TIMER_CMT
and configure timer channel using platform data.

If multiple CMT channels are enabled using platform data, use the
earlytimer parameter on the kernel command line to select channel.
For instance, use "earlytimer=sh_cmt.0" to select the first channel.

To verify which timer is being used, look at printouts or the timer
irq count in /proc/interrupts.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -462,22 +462,14 @@ config SH_TMU
 	help
 	  This enables the use of the TMU as the system timer.
 
-config SH_CMT
-	bool "CMT timer support"
-	depends on SYS_SUPPORTS_CMT && CPU_SH2
-	default y
-	help
-	  This enables the use of the CMT as the system timer.
-
-#
-# Support for the new-style CMT driver. This will replace SH_CMT
-# once its other dependencies are merged.
-#
 config SH_TIMER_CMT
-	bool "CMT clockevents driver"
-	depends on SYS_SUPPORTS_CMT && !SH_CMT
+	bool "CMT timer driver"
+	depends on SYS_SUPPORTS_CMT
+	default y
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_TIME
+	help
+	  This enables build of the CMT timer driver.
 
 config SH_MTU2
 	bool "MTU2 timer support"

arch/sh/include/asm/timer.h

@@ -23,7 +23,7 @@ struct sys_timer {
 
 #define TICK_SIZE (tick_nsec / 1000)
 
-extern struct sys_timer tmu_timer, cmt_timer, mtu2_timer;
+extern struct sys_timer tmu_timer, mtu2_timer;
 extern struct sys_timer *sys_timer;
 
 #ifndef CONFIG_GENERIC_TIME

arch/sh/kernel/timers/Makefile

@@ -6,6 +6,5 @@ obj-y	:= timer.o
 
 obj-$(CONFIG_SH_TMU)		+= timer-tmu.o
 obj-$(CONFIG_SH_MTU2)		+= timer-mtu2.o
-obj-$(CONFIG_SH_CMT)		+= timer-cmt.o
 
 obj-$(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)	+= timer-broadcast.o

arch/sh/kernel/timers/timer.c

@@ -19,9 +19,6 @@ static struct sys_timer *sys_timers[] = {
 #endif
 #ifdef CONFIG_SH_MTU2
 	&mtu2_timer,
-#endif
-#ifdef CONFIG_SH_CMT
-	&cmt_timer,
 #endif
 	NULL,
 };