OMAP3+: VP: struct omap_vp_common: replace shift with __ffs(mask)

In struct omap_vp_common, the shift value can be derived from the mask
value by using __ffs(), so remove the shift value for the various
VPCONFIG bitfields, and use __ffs() in the code for the shift value.

While here, rename field names in kerneldoc comment to match actual
field names in structure.  Also, cleanup indendentaion for other VP
register accesses in omap_vp_init().

No functional changes.
Signed-off-by: Kevin Hilman <khilman@ti.com>

arch/arm/mach-omap2/vc.c

@@ -149,7 +149,7 @@ int omap_vc_pre_scale(struct voltagedomain *voltdm,
 		vdd->vp_rt_data.vpconfig_errorgain = volt_data->vp_errgain;
 		vp_errgain_val &= voltdm->vp->common->vpconfig_errorgain_mask;
 		vp_errgain_val |= vdd->vp_rt_data.vpconfig_errorgain <<
-			voltdm->vp->common->vpconfig_errorgain_shift;
+			__ffs(voltdm->vp->common->vpconfig_errorgain_mask);
 		voltdm->write(vp_errgain_val, voltdm->vp->vpconfig);
 	}
 

arch/arm/mach-omap2/voltage.c

@@ -82,7 +82,7 @@ static int __init _config_common_vdd_data(struct voltagedomain *voltdm)
 
 	vdd->vp_rt_data.vpconfig_erroroffset =
 		(voltdm->pmic->vp_erroroffset <<
-		 voltdm->vp->common->vpconfig_erroroffset_shift);
+		 __ffs(voltdm->vp->common->vpconfig_erroroffset_mask));
 
 	timeout_val = (sys_clk_speed * voltdm->pmic->vp_timeout_us) / 1000;
 	vdd->vp_rt_data.vlimitto_timeout = timeout_val;

arch/arm/mach-omap2/vp.c

@@ -34,8 +34,7 @@ static void vp_latch_vsel(struct voltagedomain *voltdm)
 	vpconfig = voltdm->read(vp->vpconfig);
 	vpconfig &= ~(vp->common->vpconfig_initvoltage_mask |
 			vp->common->vpconfig_initvdd);
-	vpconfig |= vsel << vp->common->vpconfig_initvoltage_shift;
-
+	vpconfig |= vsel << __ffs(vp->common->vpconfig_initvoltage_mask);
 	voltdm->write(vpconfig, vp->vpconfig);
 
 	/* Trigger initVDD value copy to voltage processor */
@@ -61,7 +60,7 @@ void __init omap_vp_init(struct voltagedomain *voltdm)
 
 	vp_val = vdd->vp_rt_data.vpconfig_erroroffset |
 		(vdd->vp_rt_data.vpconfig_errorgain <<
-		vp->common->vpconfig_errorgain_shift) |
+		 __ffs(vp->common->vpconfig_errorgain_mask)) |
 		vp->common->vpconfig_timeouten;
 	voltdm->write(vp_val, vp->vpconfig);
 
@@ -121,7 +120,7 @@ int omap_vp_forceupdate_scale(struct voltagedomain *voltdm,
 			vp->common->vpconfig_forceupdate |
 			vp->common->vpconfig_initvoltage_mask);
 	vpconfig |= ((target_vsel <<
-			vp->common->vpconfig_initvoltage_shift));
+		      __ffs(vp->common->vpconfig_initvoltage_mask)));
 	voltdm->write(vpconfig, vp->vpconfig);
 
 	/* Trigger initVDD value copy to voltage processor */

arch/arm/mach-omap2/vp.h

@@ -46,37 +46,32 @@ struct omap_vp_ops {
 
 /**
  * struct omap_vp_common - register data common to all VDDs
+ * @vpconfig_erroroffset_mask: ERROROFFSET bitmask in the PRM_VP*_CONFIG reg
  * @vpconfig_errorgain_mask: ERRORGAIN bitmask in the PRM_VP*_CONFIG reg
  * @vpconfig_initvoltage_mask: INITVOLTAGE bitmask in the PRM_VP*_CONFIG reg
- * @vpconfig_timeouten_mask: TIMEOUT bitmask in the PRM_VP*_CONFIG reg
+ * @vpconfig_timeouten: TIMEOUT bitmask in the PRM_VP*_CONFIG reg
  * @vpconfig_initvdd: INITVDD bitmask in the PRM_VP*_CONFIG reg
  * @vpconfig_forceupdate: FORCEUPDATE bitmask in the PRM_VP*_CONFIG reg
  * @vpconfig_vpenable: VPENABLE bitmask in the PRM_VP*_CONFIG reg
  * @vpconfig_erroroffset_shift: ERROROFFSET field shift in PRM_VP*_CONFIG reg
  * @vpconfig_errorgain_shift: ERRORGAIN field shift in PRM_VP*_CONFIG reg
  * @vpconfig_initvoltage_shift: INITVOLTAGE field shift in PRM_VP*_CONFIG reg
- * @vpconfig_stepmin_shift: VSTEPMIN field shift in the PRM_VP*_VSTEPMIN reg
- * @vpconfig_smpswaittimemin_shift: SMPSWAITTIMEMIN field shift in PRM_VP*_VSTEPMIN reg
- * @vpconfig_stepmax_shift: VSTEPMAX field shift in the PRM_VP*_VSTEPMAX reg
- * @vpconfig_smpswaittimemax_shift: SMPSWAITTIMEMAX field shift in PRM_VP*_VSTEPMAX reg
- * @vpconfig_vlimitto_vddmin_shift: VDDMIN field shift in PRM_VP*_VLIMITTO reg
- * @vpconfig_vlimitto_vddmax_shift: VDDMAX field shift in PRM_VP*_VLIMITTO reg
- * @vpconfig_vlimitto_timeout_shift: TIMEOUT field shift in PRM_VP*_VLIMITTO reg
- *
- * XXX It it not necessary to have both a mask and a shift for the same
- *     bitfield - remove one
- * XXX Many of these fields are wrongly named -- e.g., vpconfig_smps* -- fix!
+ * @vstepmin_stepmin_shift: VSTEPMIN field shift in the PRM_VP*_VSTEPMIN reg
+ * @vstepmin_smpswaittimemin_shift: SMPSWAITTIMEMIN field shift in PRM_VP*_VSTEPMIN reg
+ * @vstepmax_stepmax_shift: VSTEPMAX field shift in the PRM_VP*_VSTEPMAX reg
+ * @vstepmax_smpswaittimemax_shift: SMPSWAITTIMEMAX field shift in PRM_VP*_VSTEPMAX reg
+ * @vlimitto_vddmin_shift: VDDMIN field shift in PRM_VP*_VLIMITTO reg
+ * @vlimitto_vddmax_shift: VDDMAX field shift in PRM_VP*_VLIMITTO reg
+ * @vlimitto_timeout_shift: TIMEOUT field shift in PRM_VP*_VLIMITTO reg
  */
 struct omap_vp_common {
+	u32 vpconfig_erroroffset_mask;
 	u32 vpconfig_errorgain_mask;
 	u32 vpconfig_initvoltage_mask;
-	u32 vpconfig_timeouten;
-	u32 vpconfig_initvdd;
-	u32 vpconfig_forceupdate;
-	u32 vpconfig_vpenable;
-	u8 vpconfig_erroroffset_shift;
-	u8 vpconfig_errorgain_shift;
-	u8 vpconfig_initvoltage_shift;
+	u8 vpconfig_timeouten;
+	u8 vpconfig_initvdd;
+	u8 vpconfig_forceupdate;
+	u8 vpconfig_vpenable;
 	u8 vstepmin_stepmin_shift;
 	u8 vstepmin_smpswaittimemin_shift;
 	u8 vstepmax_stepmax_shift;
@@ -128,7 +123,6 @@ struct omap_vp_instance {
  * XXX Is this structure really needed?  Why not just program the
  * device directly?  They are in PRM space, therefore in the WKUP
  * powerdomain, so register contents should not be lost in off-mode.
- * XXX Some of these fields are incorrectly named, e.g., vstep*
  */
 struct omap_vp_runtime_data {
 	u32 vpconfig_erroroffset;

arch/arm/mach-omap2/vp3xxx_data.c

@@ -37,10 +37,8 @@ static const struct omap_vp_ops omap3_vp_ops = {
  * XXX This stuff presumably belongs in the vp3xxx.c or vp.c file.
  */
 static const struct omap_vp_common omap3_vp_common = {
-	.vpconfig_erroroffset_shift = OMAP3430_ERROROFFSET_SHIFT,
+	.vpconfig_erroroffset_mask = OMAP3430_ERROROFFSET_MASK,
 	.vpconfig_errorgain_mask = OMAP3430_ERRORGAIN_MASK,
-	.vpconfig_errorgain_shift = OMAP3430_ERRORGAIN_SHIFT,
-	.vpconfig_initvoltage_shift = OMAP3430_INITVOLTAGE_SHIFT,
 	.vpconfig_initvoltage_mask = OMAP3430_INITVOLTAGE_MASK,
 	.vpconfig_timeouten = OMAP3430_TIMEOUTEN_MASK,
 	.vpconfig_initvdd = OMAP3430_INITVDD_MASK,

arch/arm/mach-omap2/vp44xx_data.c

@@ -37,10 +37,8 @@ static const struct omap_vp_ops omap4_vp_ops = {
  * XXX This stuff presumably belongs in the vp44xx.c or vp.c file.
  */
 static const struct omap_vp_common omap4_vp_common = {
-	.vpconfig_erroroffset_shift = OMAP4430_ERROROFFSET_SHIFT,
+	.vpconfig_erroroffset_mask = OMAP4430_ERROROFFSET_MASK,
 	.vpconfig_errorgain_mask = OMAP4430_ERRORGAIN_MASK,
-	.vpconfig_errorgain_shift = OMAP4430_ERRORGAIN_SHIFT,
-	.vpconfig_initvoltage_shift = OMAP4430_INITVOLTAGE_SHIFT,
 	.vpconfig_initvoltage_mask = OMAP4430_INITVOLTAGE_MASK,
 	.vpconfig_timeouten = OMAP4430_TIMEOUTEN_MASK,
 	.vpconfig_initvdd = OMAP4430_INITVDD_MASK,