OMAP: Introduce dependent voltage domain support

There could be dependencies between various voltage domains for
maintaining system performance or hardware limitation reasons
like VDD<X> should be at voltage v1 when VDD<Y> is at voltage v2.
This patch introduce dependent vdd information structures in the
voltage layer which can be used to populate these dependencies
for a voltage domain. This patch also adds support to scale
the dependent vdd and the scalable devices belonging to it
during the scaling of a main vdd through omap_voltage_scale.

As part of this, some of the voltage layer structure definitions are moved from
voltage.c to voltage.h as it needs to be used in the dvfs layer for dependency
voltage handling.

Based on original patch from Thara.

Signed-off-by: Vishwanath BS <vishwanath.bs@ti.com>
Cc: Thara Gopinath <thara@ti.com>

1 files changed, 110 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/include/plat/voltage.h b/arch/arm/plat-omap/include/plat/voltage.h
index e9f5408244e..6e2a69614d4 100644
--- a/arch/arm/plat-omap/include/plat/voltage.h
+++ b/arch/arm/plat-omap/include/plat/voltage.h
@@ -103,6 +103,114 @@ struct omap_volt_pmic_info {
 	u8 (*uv_to_vsel) (unsigned long uV);
 };
 
+
+/* Voltage processor register offsets */
+struct vp_reg_offs {
+	u8 vpconfig;
+	u8 vstepmin;
+	u8 vstepmax;
+	u8 vlimitto;
+	u8 vstatus;
+	u8 voltage;
+};
+
+/* Voltage Processor bit field values, shifts and masks */
+struct vp_reg_val {
+	/* PRM module */
+	u16 prm_mod;
+	/* VPx_VPCONFIG */
+	u32 vpconfig_erroroffset;
+	u16 vpconfig_errorgain;
+	u32 vpconfig_errorgain_mask;
+	u8 vpconfig_errorgain_shift;
+	u32 vpconfig_initvoltage_mask;
+	u8 vpconfig_initvoltage_shift;
+	u32 vpconfig_timeouten;
+	u32 vpconfig_initvdd;
+	u32 vpconfig_forceupdate;
+	u32 vpconfig_vpenable;
+	/* VPx_VSTEPMIN */
+	u8 vstepmin_stepmin;
+	u16 vstepmin_smpswaittimemin;
+	u8 vstepmin_stepmin_shift;
+	u8 vstepmin_smpswaittimemin_shift;
+	/* VPx_VSTEPMAX */
+	u8 vstepmax_stepmax;
+	u16 vstepmax_smpswaittimemax;
+	u8 vstepmax_stepmax_shift;
+	u8 vstepmax_smpswaittimemax_shift;
+	/* VPx_VLIMITTO */
+	u8 vlimitto_vddmin;
+	u8 vlimitto_vddmax;
+	u16 vlimitto_timeout;
+	u8 vlimitto_vddmin_shift;
+	u8 vlimitto_vddmax_shift;
+	u8 vlimitto_timeout_shift;
+	/* PRM_IRQSTATUS*/
+	u32 tranxdone_status;
+};
+
+/* Voltage controller registers and offsets */
+struct vc_reg_info {
+	/* PRM module */
+	u16 prm_mod;
+	/* VC register offsets */
+	u8 smps_sa_reg;
+	u8 smps_volra_reg;
+	u8 bypass_val_reg;
+	u8 cmdval_reg;
+	u8 voltsetup_reg;
+	/*VC_SMPS_SA*/
+	u8 smps_sa_shift;
+	u32 smps_sa_mask;
+	/* VC_SMPS_VOL_RA */
+	u8 smps_volra_shift;
+	u32 smps_volra_mask;
+	/* VC_BYPASS_VAL */
+	u8 data_shift;
+	u8 slaveaddr_shift;
+	u8 regaddr_shift;
+	u32 valid;
+	/* VC_CMD_VAL */
+	u8 cmd_on_shift;
+	u8 cmd_onlp_shift;
+	u8 cmd_ret_shift;
+	u8 cmd_off_shift;
+	u32 cmd_on_mask;
+	/* PRM_VOLTSETUP */
+	u8 voltsetup_shift;
+	u32 voltsetup_mask;
+};
+
+
+/**
+ * omap_vdd_dep_volt - Table containing the parent vdd voltage and the
+ *			dependent vdd voltage corresponding to it.
+ *
+ * @main_vdd_volt	: The main vdd voltage
+ * @dep_vdd_volt	: The voltage at which the dependent vdd should be
+ *			  when the main vdd is at <main_vdd_volt> voltage
+ */
+struct omap_vdd_dep_volt {
+	u32 main_vdd_volt;
+	u32 dep_vdd_volt;
+};
+
+/**
+ * omap_vdd_dep_info - Dependent vdd info
+ *
+ * @name		: Dependent vdd name
+ * @voltdm		: Dependent vdd pointer
+ * @dep_table		: Table containing the dependent vdd voltage
+ *			  corresponding to every main vdd voltage.
+ */
+struct omap_vdd_dep_info {
+	char *name;
+	struct voltagedomain *voltdm;
+	struct omap_vdd_dep_volt *dep_table;
+};
+
+
 /**
  * omap_vdd_info - Per Voltage Domain info
  *
@@ -130,6 +238,8 @@ struct omap_vdd_info {
 	struct omap_vc_instance_data *vc_data;
 	const struct omap_vfsm_instance_data *vfsm;
 	struct voltagedomain voltdm;
+	struct omap_vdd_dep_info *dep_vdd_info;
+	int nr_dep_vdd;
 	struct dentry *debug_dir;
 	u32 curr_volt;
 	bool vp_enabled;