arch/arm/mach-omap2/voltage.h

   1 /*
   2  * OMAP Voltage Management Routines
   3  *
   4  * Author: Thara Gopinath       <thara@ti.com>
   5  *
   6  * Copyright (C) 2009 Texas Instruments, Inc.
   7  * Thara Gopinath <thara@ti.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #ifndef __ARCH_ARM_MACH_OMAP2_VOLTAGE_H
  15 #define __ARCH_ARM_MACH_OMAP2_VOLTAGE_H
  16
  17 #include <linux/err.h>
  18
  19 #include "vc.h"
  20 #include "vp.h"
  21
  22 /* XXX document */
  23 #define VOLTSCALE_VPFORCEUPDATE         1
  24 #define VOLTSCALE_VCBYPASS              2
  25
  26 /*
  27  * OMAP3 GENERIC setup times. Revisit to see if these needs to be
  28  * passed from board or PMIC file
  29  */
  30 #define OMAP3_CLKSETUP          0xff
  31 #define OMAP3_VOLTOFFSET        0xff
  32 #define OMAP3_VOLTSETUP2        0xff
  33
  34 /**
  35  * struct omap_vfsm_instance_data - per-voltage manager FSM register/bitfield
  36  * data
  37  * @voltsetup_mask: SETUP_TIME* bitmask in the PRM_VOLTSETUP* register
  38  * @voltsetup_reg: register offset of PRM_VOLTSETUP from PRM base
  39  * @voltsetup_shift: SETUP_TIME* field shift in the PRM_VOLTSETUP* register
  40  *
  41  * XXX What about VOLTOFFSET/VOLTCTRL?
  42  * XXX It is not necessary to have both a _mask and a _shift for the same
  43  *     bitfield - remove one!
  44  */
  45 struct omap_vfsm_instance_data {
  46         u32 voltsetup_mask;
  47         u8 voltsetup_reg;
  48         u8 voltsetup_shift;
  49 };
  50
  51 /**
  52  * struct voltagedomain - omap voltage domain global structure.
  53  * @name:       Name of the voltage domain which can be used as a unique
  54  *              identifier.
  55  */
  56 struct voltagedomain {
  57         char *name;
  58 };
  59
  60 /**
  61  * struct omap_volt_data - Omap voltage specific data.
  62  * @voltage_nominal:    The possible voltage value in uV
  63  * @sr_efuse_offs:      The offset of the efuse register(from system
  64  *                      control module base address) from where to read
  65  *                      the n-target value for the smartreflex module.
  66  * @sr_errminlimit:     Error min limit value for smartreflex. This value
  67  *                      differs at differnet opp and thus is linked
  68  *                      with voltage.
  69  * @vp_errorgain:       Error gain value for the voltage processor. This
  70  *                      field also differs according to the voltage/opp.
  71  */
  72 struct omap_volt_data {
  73         u32     volt_nominal;
  74         u32     sr_efuse_offs;
  75         u8      sr_errminlimit;
  76         u8      vp_errgain;
  77 };
  78
  79 /**
  80  * struct omap_volt_pmic_info - PMIC specific data required by voltage driver.
  81  * @slew_rate:  PMIC slew rate (in uv/us)
  82  * @step_size:  PMIC voltage step size (in uv)
  83  * @vsel_to_uv: PMIC API to convert vsel value to actual voltage in uV.
  84  * @uv_to_vsel: PMIC API to convert voltage in uV to vsel value.
  85  */
  86 struct omap_volt_pmic_info {
  87         int slew_rate;
  88         int step_size;
  89         u32 on_volt;
  90         u32 onlp_volt;
  91         u32 ret_volt;
  92         u32 off_volt;
  93         u16 volt_setup_time;
  94         u8 vp_erroroffset;
  95         u8 vp_vstepmin;
  96         u8 vp_vstepmax;
  97         u8 vp_vddmin;
  98         u8 vp_vddmax;
  99         u8 vp_timeout_us;
 100         u8 i2c_slave_addr;
 101         u8 pmic_reg;
 102         unsigned long (*vsel_to_uv) (const u8 vsel);
 103         u8 (*uv_to_vsel) (unsigned long uV);
 104 };
 105
 106 /**
 107  * omap_vdd_info - Per Voltage Domain info
 108  *
 109  * @volt_data           : voltage table having the distinct voltages supported
 110  *                        by the domain and other associated per voltage data.
 111  * @pmic_info           : pmic specific parameters which should be populted by
 112  *                        the pmic drivers.
 113  * @vp_data             : the register values, shifts, masks for various
 114  *                        vp registers
 115  * @vp_rt_data          : VP data derived at runtime, not predefined
 116  * @vc_data             : structure containing various various vc registers,
 117  *                        shifts, masks etc.
 118  * @vfsm                : voltage manager FSM data
 119  * @voltdm              : pointer to the voltage domain structure
 120  * @debug_dir           : debug directory for this voltage domain.
 121  * @curr_volt           : current voltage for this vdd.
 122  * @vp_enabled          : flag to keep track of whether vp is enabled or not
 123  * @volt_scale          : API to scale the voltage of the vdd.
 124  */
 125 struct omap_vdd_info {
 126         struct omap_volt_data *volt_data;
 127         struct omap_volt_pmic_info *pmic_info;
 128         struct omap_vp_instance_data *vp_data;
 129         struct omap_vp_runtime_data vp_rt_data;
 130         struct omap_vc_instance_data *vc_data;
 131         const struct omap_vfsm_instance_data *vfsm;
 132         struct voltagedomain voltdm;
 133         struct dentry *debug_dir;
 134         u32 curr_volt;
 135         bool vp_enabled;
 136         u32 (*read_reg) (u16 mod, u8 offset);
 137         void (*write_reg) (u32 val, u16 mod, u8 offset);
 138         int (*volt_scale) (struct omap_vdd_info *vdd,
 139                 unsigned long target_volt);
 140 };
 141
 142 unsigned long omap_vp_get_curr_volt(struct voltagedomain *voltdm);
 143 void omap_vp_enable(struct voltagedomain *voltdm);
 144 void omap_vp_disable(struct voltagedomain *voltdm);
 145 int omap_voltage_scale_vdd(struct voltagedomain *voltdm,
 146                 unsigned long target_volt);
 147 void omap_voltage_reset(struct voltagedomain *voltdm);
 148 void omap_voltage_get_volttable(struct voltagedomain *voltdm,
 149                 struct omap_volt_data **volt_data);
 150 struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm,
 151                 unsigned long volt);
 152 unsigned long omap_voltage_get_nom_volt(struct voltagedomain *voltdm);
 153 struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm);
 154 int __init omap_voltage_early_init(s16 prm_mod, s16 prm_irqst_mod,
 155                                    struct omap_vdd_info *omap_vdd_array[],
 156                                    u8 omap_vdd_count);
 157 #ifdef CONFIG_PM
 158 int omap_voltage_register_pmic(struct voltagedomain *voltdm,
 159                 struct omap_volt_pmic_info *pmic_info);
 160 void omap_change_voltscale_method(struct voltagedomain *voltdm,
 161                 int voltscale_method);
 162 /* API to get the voltagedomain pointer */
 163 struct voltagedomain *omap_voltage_domain_lookup(char *name);
 164
 165 int omap_voltage_late_init(void);
 166 #else
 167 static inline int omap_voltage_register_pmic(struct voltagedomain *voltdm,
 168                 struct omap_volt_pmic_info *pmic_info)
 169 {
 170         return -EINVAL;
 171 }
 172 static inline  void omap_change_voltscale_method(struct voltagedomain *voltdm,
 173                 int voltscale_method) {}
 174 static inline int omap_voltage_late_init(void)
 175 {
 176         return -EINVAL;
 177 }
 178 static inline struct voltagedomain *omap_voltage_domain_lookup(char *name)
 179 {
 180         return ERR_PTR(-EINVAL);
 181 }
 182 #endif
 183
 184 #endif