OMAP3+: VC: cleanup i2c slave address configuration

- Add an i2c_slave_address field to the omap_vc_channel
- use VC/VP read/modify/write helper instead of open-coding
- remove smps_sa_shift, use __ffs(mask) for shift value
- I2C addresses 10-bit, change size to u16

Special thanks to Shweta Gulati <shweta.gulati@ti.com> for suggesting
the use of __ffs(x) instead of ffs(x) - 1.

Signed-off-by: Kevin Hilman <khilman@ti.com>

5 files changed, 15 insertions, 14 deletions

diff --git a/arch/arm/mach-omap2/vc.c b/arch/arm/mach-omap2/vc.c
index f1c73cbe3cb4..d5e792f20f16 100644
--- a/arch/arm/mach-omap2/vc.c
+++ b/arch/arm/mach-omap2/vc.c
@@ -241,11 +241,13 @@ void __init omap_vc_init_channel(struct voltagedomain *voltdm)
                 return;
         }
 
-        /* Set up the SMPS_SA(i2c slave address in VC */
-        vc_val = voltdm->read(vc->common->smps_sa_reg);
-        vc_val &= ~vc->smps_sa_mask;
-        vc_val |= vdd->pmic_info->i2c_slave_addr << vc->smps_sa_shift;
-        voltdm->write(vc_val, vc->common->smps_sa_reg);
+        /* get PMIC/board specific settings */
+        vc->i2c_slave_addr = vdd->pmic_info->i2c_slave_addr;
+
+        /* Configure the i2c slave address for this VC */
+        voltdm->rmw(vc->smps_sa_mask,
+                    vc->i2c_slave_addr << __ffs(vc->smps_sa_mask),
+                    vc->common->smps_sa_reg);
 
         /* Setup the VOLRA(pmic reg addr) in VC */
         vc_val = voltdm->read(vc->common->smps_volra_reg);
diff --git a/arch/arm/mach-omap2/vc.h b/arch/arm/mach-omap2/vc.h
index d0050f0ee6d5..69ca900aff0b 100644
--- a/arch/arm/mach-omap2/vc.h
+++ b/arch/arm/mach-omap2/vc.h
@@ -56,21 +56,24 @@ struct omap_vc_common {
 
 /**
  * struct omap_vc_channel - VC per-instance data
+ * @i2c_slave_addr: I2C slave address of PMIC for this VC channel
  * @common: pointer to VC common data for this platform
- * @smps_sa_mask: SA* bitmask in the PRM_VC_SMPS_SA register
+ * @smps_sa_mask: i2c slave address bitmask in the PRM_VC_SMPS_SA register
  * @smps_volra_mask: VOLRA* bitmask in the PRM_VC_VOL_RA register
- * @smps_sa_shift: SA* field shift in the PRM_VC_SMPS_SA register
  * @smps_volra_shift: VOLRA* field shift in the PRM_VC_VOL_RA register
  *
  * XXX It is not necessary to have both a *_mask and a *_shift -
  *     remove one
  */
 struct omap_vc_channel {
+        /* channel state */
+        u16 i2c_slave_addr;
+
+        /* register access data */
         const struct omap_vc_common *common;
         u32 smps_sa_mask;
         u32 smps_volra_mask;
         u8 cmdval_reg;
-        u8 smps_sa_shift;
         u8 smps_volra_shift;
 };
 
diff --git a/arch/arm/mach-omap2/vc3xxx_data.c b/arch/arm/mach-omap2/vc3xxx_data.c
index 6b6720301345..86be50c263ac 100644
--- a/arch/arm/mach-omap2/vc3xxx_data.c
+++ b/arch/arm/mach-omap2/vc3xxx_data.c
@@ -47,7 +47,6 @@ static struct omap_vc_common omap3_vc_common = {
 struct omap_vc_channel omap3_vc_mpu = {
         .common = &omap3_vc_common,
         .cmdval_reg = OMAP3_PRM_VC_CMD_VAL_0_OFFSET,
-        .smps_sa_shift = OMAP3430_PRM_VC_SMPS_SA_SA0_SHIFT,
         .smps_sa_mask = OMAP3430_PRM_VC_SMPS_SA_SA0_MASK,
         .smps_volra_shift = OMAP3430_VOLRA0_SHIFT,
         .smps_volra_mask = OMAP3430_VOLRA0_MASK,
@@ -56,7 +55,6 @@ struct omap_vc_channel omap3_vc_mpu = {
 struct omap_vc_channel omap3_vc_core = {
         .common = &omap3_vc_common,
         .cmdval_reg = OMAP3_PRM_VC_CMD_VAL_1_OFFSET,
-        .smps_sa_shift = OMAP3430_PRM_VC_SMPS_SA_SA1_SHIFT,
         .smps_sa_mask = OMAP3430_PRM_VC_SMPS_SA_SA1_MASK,
         .smps_volra_shift = OMAP3430_VOLRA1_SHIFT,
         .smps_volra_mask = OMAP3430_VOLRA1_MASK,
diff --git a/arch/arm/mach-omap2/vc44xx_data.c b/arch/arm/mach-omap2/vc44xx_data.c
index e3125a370fa7..af922b440e96 100644
--- a/arch/arm/mach-omap2/vc44xx_data.c
+++ b/arch/arm/mach-omap2/vc44xx_data.c
@@ -49,7 +49,6 @@ static const struct omap_vc_common omap4_vc_common = {
 struct omap_vc_channel omap4_vc_mpu = {
         .common = &omap4_vc_common,
         .cmdval_reg = OMAP4_PRM_VC_VAL_CMD_VDD_MPU_L_OFFSET,
-        .smps_sa_shift = OMAP4430_SA_VDD_MPU_L_PRM_VC_SMPS_SA_SHIFT,
         .smps_sa_mask = OMAP4430_SA_VDD_MPU_L_PRM_VC_SMPS_SA_MASK,
         .smps_volra_shift = OMAP4430_VOLRA_VDD_MPU_L_SHIFT,
         .smps_volra_mask = OMAP4430_VOLRA_VDD_MPU_L_MASK,
@@ -58,7 +57,6 @@ struct omap_vc_channel omap4_vc_mpu = {
 struct omap_vc_channel omap4_vc_iva = {
         .common = &omap4_vc_common,
         .cmdval_reg = OMAP4_PRM_VC_VAL_CMD_VDD_IVA_L_OFFSET,
-        .smps_sa_shift = OMAP4430_SA_VDD_IVA_L_PRM_VC_SMPS_SA_SHIFT,
         .smps_sa_mask = OMAP4430_SA_VDD_IVA_L_PRM_VC_SMPS_SA_MASK,
         .smps_volra_shift = OMAP4430_VOLRA_VDD_IVA_L_SHIFT,
         .smps_volra_mask = OMAP4430_VOLRA_VDD_IVA_L_MASK,
@@ -67,7 +65,6 @@ struct omap_vc_channel omap4_vc_iva = {
 struct omap_vc_channel omap4_vc_core = {
         .common = &omap4_vc_common,
         .cmdval_reg = OMAP4_PRM_VC_VAL_CMD_VDD_CORE_L_OFFSET,
-        .smps_sa_shift = OMAP4430_SA_VDD_CORE_L_0_6_SHIFT,
         .smps_sa_mask = OMAP4430_SA_VDD_CORE_L_0_6_MASK,
         .smps_volra_shift = OMAP4430_VOLRA_VDD_CORE_L_SHIFT,
         .smps_volra_mask = OMAP4430_VOLRA_VDD_CORE_L_MASK,
diff --git a/arch/arm/mach-omap2/voltage.h b/arch/arm/mach-omap2/voltage.h
index 6a19cf39118b..590384978279 100644
--- a/arch/arm/mach-omap2/voltage.h
+++ b/arch/arm/mach-omap2/voltage.h
@@ -102,6 +102,7 @@ struct omap_volt_data {
  * struct omap_volt_pmic_info - PMIC specific data required by voltage driver.
  * @slew_rate:  PMIC slew rate (in uv/us)
  * @step_size:  PMIC voltage step size (in uv)
+ * @i2c_slave_addr: I2C slave address of PMIC
  * @vsel_to_uv: PMIC API to convert vsel value to actual voltage in uV.
  * @uv_to_vsel: PMIC API to convert voltage in uV to vsel value.
  * @volt_reg_addr: voltage configuration register address
@@ -115,13 +116,13 @@ struct omap_volt_pmic_info {
         u32 ret_volt;
         u32 off_volt;
         u16 volt_setup_time;
+        u16 i2c_slave_addr;
         u8 vp_erroroffset;
         u8 vp_vstepmin;
         u8 vp_vstepmax;
         u8 vp_vddmin;
         u8 vp_vddmax;
         u8 vp_timeout_us;
-        u8 i2c_slave_addr;
         u8 volt_reg_addr;
         u8 cmd_reg_addr;
         unsigned long (*vsel_to_uv) (const u8 vsel);