ARM: 5778/1: AT91: Add cpuidle support

This patch adds the support for cpuidle on AT91 SoCs, taken from the
cpuidle support in mach-kirkwood.
cpuidle needs sdram_selfrefresh_enable and _disable, so move their
definition to a separate header file instead of duplicating the code
already used in pm.c.

Tested-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 4 insertions, 58 deletions

diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 4028724d490d..615668986480 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -29,62 +29,7 @@
 #include <mach/cpu.h>
 
 #include "generic.h"
-
-#ifdef CONFIG_ARCH_AT91RM9200
-#include <mach/at91rm9200_mc.h>
-
-/*
- * The AT91RM9200 goes into self-refresh mode with this command, and will
- * terminate self-refresh automatically on the next SDRAM access.
- */
-#define sdram_selfrefresh_enable()      at91_sys_write(AT91_SDRAMC_SRR, 1)
-#define sdram_selfrefresh_disable()     do {} while (0)
-
-#elif defined(CONFIG_ARCH_AT91CAP9)
-#include <mach/at91cap9_ddrsdr.h>
-
-static u32 saved_lpr;
-
-static inline void sdram_selfrefresh_enable(void)
-{
-        u32 lpr;
-
-        saved_lpr = at91_sys_read(AT91_DDRSDRC_LPR);
-
-        lpr = saved_lpr & ~AT91_DDRSDRC_LPCB;
-        at91_sys_write(AT91_DDRSDRC_LPR, lpr | AT91_DDRSDRC_LPCB_SELF_REFRESH);
-}
-
-#define sdram_selfrefresh_disable()     at91_sys_write(AT91_DDRSDRC_LPR, saved_lpr)
-
-#else
-#include <mach/at91sam9_sdramc.h>
-
-#ifdef CONFIG_ARCH_AT91SAM9263
-/*
- * FIXME either or both the SDRAM controllers (EB0, EB1) might be in use;
- * handle those cases both here and in the Suspend-To-RAM support.
- */
-#define AT91_SDRAMC     AT91_SDRAMC0
-#warning Assuming EB1 SDRAM controller is *NOT* used
-#endif
-
-static u32 saved_lpr;
-
-static inline void sdram_selfrefresh_enable(void)
-{
-        u32 lpr;
-
-        saved_lpr = at91_sys_read(AT91_SDRAMC_LPR);
-
-        lpr = saved_lpr & ~AT91_SDRAMC_LPCB;
-        at91_sys_write(AT91_SDRAMC_LPR, lpr | AT91_SDRAMC_LPCB_SELF_REFRESH);
-}
-
-#define sdram_selfrefresh_disable()     at91_sys_write(AT91_SDRAMC_LPR, saved_lpr)
-
-#endif
-
+#include "pm.h"
 
 /*
  * Show the reason for the previous system reset.
@@ -260,6 +205,7 @@ extern u32 at91_slow_clock_sz;
 
 static int at91_pm_enter(suspend_state_t state)
 {
+        u32 saved_lpr;
         at91_gpio_suspend();
         at91_irq_suspend();
 
@@ -315,9 +261,9 @@ static int at91_pm_enter(suspend_state_t state)
                          */
                         asm("b 1f; .align 5; 1:");
                         asm("mcr p15, 0, r0, c7, c10, 4");      /* drain write buffer */
-                        sdram_selfrefresh_enable();
+                        saved_lpr = sdram_selfrefresh_enable();
                         asm("mcr p15, 0, r0, c7, c0, 4");       /* wait for interrupt */
-                        sdram_selfrefresh_disable();
+                        sdram_selfrefresh_disable(saved_lpr);
                         break;
 
                 case PM_SUSPEND_ON: