mfd: Add support for remapping twl4030-power power states

The <RESOURCE>_REMAP register allows configuration of the <RESOURCE> in case
of a sleep or off transition.

Allow this property of resources to be configured (through twl4030_resconfig)
and add code to parse these values to program the registers accordingly.

Signed-off-by: Amit Kucheria <amit.kucheria@verdurent.com>
Cc: linux-omap@vger.kernel.org
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 39 insertions, 0 deletions

diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c
index 2c38ac17ab64..3e41e0c0e4c6 100644
--- a/drivers/mfd/twl4030-power.c
+++ b/drivers/mfd/twl4030-power.c
@@ -75,6 +75,8 @@ static u8 twl4030_start_script_address = 0x2b;
 */
 #define DEV_GRP_OFFSET          0
 #define TYPE_OFFSET             1
+#define REMAP_OFFSET            2
+#define DEDICATED_OFFSET        3
 
 /* Bit positions in the registers */
 
@@ -88,6 +90,12 @@ static u8 twl4030_start_script_address = 0x2b;
 #define TYPE2_SHIFT             3
 #define TYPE2_MASK              (3 << TYPE2_SHIFT)
 
+/* <RESOURCE>_REMAP */
+#define SLEEP_STATE_SHIFT       0
+#define SLEEP_STATE_MASK        (0xf << SLEEP_STATE_SHIFT)
+#define OFF_STATE_SHIFT         4
+#define OFF_STATE_MASK          (0xf << OFF_STATE_SHIFT)
+
 static u8 res_config_addrs[] = {
         [RES_VAUX1]     = 0x17,
         [RES_VAUX2]     = 0x1b,
@@ -325,6 +333,7 @@ static int __init twl4030_configure_resource(struct twl4030_resconfig *rconfig)
         int err;
         u8 type;
         u8 grp;
+        u8 remap;
 
         if (rconfig->resource > TOTAL_RESOURCES) {
                 pr_err("TWL4030 Resource %d does not exist\n",
@@ -380,6 +389,33 @@ static int __init twl4030_configure_resource(struct twl4030_resconfig *rconfig)
                 return err;
         }
 
+        /* Set remap states */
+        err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &remap,
+                                rconfig_addr + REMAP_OFFSET);
+        if (err < 0) {
+                pr_err("TWL4030 Resource %d remap could not be read\n",
+                        rconfig->resource);
+                return err;
+        }
+
+        if (rconfig->remap_off >= 0) {
+                remap &= ~OFF_STATE_MASK;
+                remap |= rconfig->remap_off << OFF_STATE_SHIFT;
+        }
+
+        if (rconfig->remap_sleep >= 0) {
+                remap &= ~SLEEP_STATE_MASK;
+                remap |= rconfig->remap_off << SLEEP_STATE_SHIFT;
+        }
+
+        err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
+                                remap,
+                                rconfig_addr + REMAP_OFFSET);
+        if (err < 0) {
+                pr_err("TWL4030 failed to program remap\n");
+                return err;
+        }
+
         return 0;
 }
 
diff --git a/include/linux/i2c/twl4030.h b/include/linux/i2c/twl4030.h
index 5306a759cbde..e87cb270d8a1 100644
--- a/include/linux/i2c/twl4030.h
+++ b/include/linux/i2c/twl4030.h
@@ -250,6 +250,7 @@ int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes);
 
 #define RES_TYPE_ALL            0x7
 
+/* Resource states */
 #define RES_STATE_WRST          0xF
 #define RES_STATE_ACTIVE        0xE
 #define RES_STATE_SLEEP         0x8
@@ -391,6 +392,8 @@ struct twl4030_resconfig {
         u8 devgroup;    /* Processor group that Power resource belongs to */
         u8 type;        /* Power resource addressed, 6 / broadcast message */
         u8 type2;       /* Power resource addressed, 3 / broadcast message */
+        u8 remap_off;   /* off state remapping */
+        u8 remap_sleep; /* sleep state remapping */
 };
 
 struct twl4030_power_data {