ARM: shmobile: Make sh7372 cpuidle handling more straightforward

The sh7372 cpuidle code uses the same artificially designed routine
shmobile_cpuidle_enter() as the .enter() callback for all of its
cpuidle states.  However, shmobile_cpuidle_enter() calls a different
"enter" function for each state using an array of function pointers
populated by the sh7372 PM initialization code.  Moreover, the
states[] array of the shmobile cpuidle driver is populated by that
code as well, although in principle it just might have been filled
with static data.

All of that complexity goes away if the sh7372 cpuidle code is
allowed to define its own cpuidle driver structure that can be passed
for registration to the common shmobile cpuidle initialization
routine, so modify the code accordingly.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>

1 files changed, 45 insertions, 34 deletions

diff --git a/arch/arm/mach-shmobile/pm-sh7372.c b/arch/arm/mach-shmobile/pm-sh7372.c
index d01122c..5cafd35 100644
--- a/arch/arm/mach-shmobile/pm-sh7372.c
+++ b/arch/arm/mach-shmobile/pm-sh7372.c
@@ -21,6 +21,7 @@
 #include <linux/irq.h>
 #include <linux/bitrev.h>
 #include <linux/console.h>
+#include <asm/cpuidle.h>
 #include <asm/io.h>
 #include <asm/tlbflush.h>
 #include <asm/suspend.h>
@@ -347,7 +348,8 @@ static int sh7372_do_idle_core_standby(unsigned long unused)
 	return 0;
 }
 
-static void sh7372_enter_core_standby(void)
+static int sh7372_enter_core_standby(struct cpuidle_device *dev,
+				     struct cpuidle_driver *drv, int index)
 {
 	sh7372_set_reset_vector(__pa(sh7372_resume_core_standby_sysc));
 
@@ -358,52 +360,61 @@ static void sh7372_enter_core_standby(void)
 
 	 /* disable reset vector translation */
 	__raw_writel(0, SBAR);
+
+	return 1;
 }
 
-static void sh7372_enter_a3sm_pll_on(void)
+static int sh7372_enter_a3sm_pll_on(struct cpuidle_device *dev,
+				    struct cpuidle_driver *drv, int index)
 {
 	sh7372_enter_a3sm_common(1);
+	return 2;
 }
 
-static void sh7372_enter_a3sm_pll_off(void)
+static int sh7372_enter_a3sm_pll_off(struct cpuidle_device *dev,
+				     struct cpuidle_driver *drv, int index)
 {
 	sh7372_enter_a3sm_common(0);
+	return 3;
 }
 
-static void sh7372_cpuidle_setup(struct cpuidle_driver *drv)
-{
-	struct cpuidle_state *state = &drv->states[drv->state_count];
-
-	snprintf(state->name, CPUIDLE_NAME_LEN, "C2");
-	strncpy(state->desc, "Core Standby Mode", CPUIDLE_DESC_LEN);
-	state->exit_latency = 10;
-	state->target_residency = 20 + 10;
-	state->flags = CPUIDLE_FLAG_TIME_VALID;
-	shmobile_cpuidle_modes[drv->state_count] = sh7372_enter_core_standby;
-	drv->state_count++;
-
-	state = &drv->states[drv->state_count];
-	snprintf(state->name, CPUIDLE_NAME_LEN, "C3");
-	strncpy(state->desc, "A3SM PLL ON", CPUIDLE_DESC_LEN);
-	state->exit_latency = 20;
-	state->target_residency = 30 + 20;
-	state->flags = CPUIDLE_FLAG_TIME_VALID;
-	shmobile_cpuidle_modes[drv->state_count] = sh7372_enter_a3sm_pll_on;
-	drv->state_count++;
-
-	state = &drv->states[drv->state_count];
-	snprintf(state->name, CPUIDLE_NAME_LEN, "C4");
-	strncpy(state->desc, "A3SM PLL OFF", CPUIDLE_DESC_LEN);
-	state->exit_latency = 120;
-	state->target_residency = 30 + 120;
-	state->flags = CPUIDLE_FLAG_TIME_VALID;
-	shmobile_cpuidle_modes[drv->state_count] = sh7372_enter_a3sm_pll_off;
-	drv->state_count++;
-}
+static struct cpuidle_driver sh7372_cpuidle_driver = {
+	.name			= "sh7372_cpuidle",
+	.owner			= THIS_MODULE,
+	.en_core_tk_irqen	= 1,
+	.state_count		= 4,
+	.safe_state_index	= 0, /* C1 */
+	.states[0] = ARM_CPUIDLE_WFI_STATE,
+	.states[0].enter = shmobile_enter_wfi,
+	.states[1] = {
+		.name = "C2",
+		.desc = "Core Standby Mode",
+		.exit_latency = 10,
+		.target_residency = 20 + 10,
+		.flags = CPUIDLE_FLAG_TIME_VALID,
+		.enter = sh7372_enter_core_standby,
+	},
+	.states[2] = {
+		.name = "C3",
+		.desc = "A3SM PLL ON",
+		.exit_latency = 20,
+		.target_residency = 30 + 20,
+		.flags = CPUIDLE_FLAG_TIME_VALID,
+		.enter = sh7372_enter_a3sm_pll_on,
+	},
+	.states[3] = {
+		.name = "C4",
+		.desc = "A3SM PLL OFF",
+		.exit_latency = 120,
+		.target_residency = 30 + 120,
+		.flags = CPUIDLE_FLAG_TIME_VALID,
+		.enter = sh7372_enter_a3sm_pll_off,
+	},
+};
 
 static void sh7372_cpuidle_init(void)
 {
-	shmobile_cpuidle_setup = sh7372_cpuidle_setup;
+	shmobile_cpuidle_set_driver(&sh7372_cpuidle_driver);
 }
 #else
 static void sh7372_cpuidle_init(void) {}