[ARM] pxa: better MFP low power state support for pxa25x/pxa27x

When configured as a specific low power state: MFP_LPM_DRIVE_LOW,
MFP_LPM_DRIVE_HIGH, the corresponding GPDR register bit during
low power mode shall be re-configured as output (if they are not
configured so), thus the PGSRx bits can output.

Create an additional low power values GPDR registers, and properly
save/restore the GAFR + GPDR registers when doing suspend/resume.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 3 insertions, 25 deletions

diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c
index 305452b56e91..f0eda2094494 100644
--- a/arch/arm/mach-pxa/pxa25x.c
+++ b/arch/arm/mach-pxa/pxa25x.c
@@ -203,33 +203,17 @@ static struct clk pxa25x_clks[] = {
  * More ones like CP and general purpose register values are preserved
  * with the stack pointer in sleep.S.
  */
-enum {  SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2,
-
-        SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
-        SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
-        SLEEP_SAVE_GAFR2_L, SLEEP_SAVE_GAFR2_U,
-
+enum {
         SLEEP_SAVE_PSTR,
-
         SLEEP_SAVE_CKEN,
-
         SLEEP_SAVE_COUNT
 };
 
 
 static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
 {
-        SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2);
-
-        SAVE(GAFR0_L); SAVE(GAFR0_U);
-        SAVE(GAFR1_L); SAVE(GAFR1_U);
-        SAVE(GAFR2_L); SAVE(GAFR2_U);
-
         SAVE(CKEN);
         SAVE(PSTR);
-
-        /* Clear GPIO transition detect bits */
-        GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
 }
 
 static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
@@ -237,14 +221,6 @@ static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
         /* ensure not to come back here if it wasn't intended */
         PSPR = 0;
 
-        /* restore registers */
-        RESTORE(GAFR0_L); RESTORE(GAFR0_U);
-        RESTORE(GAFR1_L); RESTORE(GAFR1_U);
-        RESTORE(GAFR2_L); RESTORE(GAFR2_U);
-        RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
-
-        PSSR = PSSR_RDH | PSSR_PH;
-
         RESTORE(CKEN);
         RESTORE(PSTR);
 }
@@ -330,6 +306,8 @@ static struct sys_device pxa25x_sysdev[] = {
         {
                 .cls    = &pxa_irq_sysclass,
         }, {
+                .cls    = &pxa2xx_mfp_sysclass,
+        }, {
                 .cls    = &pxa_gpio_sysclass,
         },
 };