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Linux/arch/arm/mach-omap2/voltage.h

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  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 <linux/platform_data/voltage-omap.h>
 20 
 21 #include "vc.h"
 22 #include "vp.h"
 23 
 24 struct powerdomain;
 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 - 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_off_reg: register offset of PRM_VOLTSETUP_OFF from PRM base
 40  *
 41  * XXX What about VOLTOFFSET/VOLTCTRL?
 42  */
 43 struct omap_vfsm_instance {
 44         u32 voltsetup_mask;
 45         u8 voltsetup_reg;
 46         u8 voltsetup_off_reg;
 47 };
 48 
 49 /**
 50  * struct voltagedomain - omap voltage domain global structure.
 51  * @name: Name of the voltage domain which can be used as a unique identifier.
 52  * @scalable: Whether or not this voltage domain is scalable
 53  * @node: list_head linking all voltage domains
 54  * @vc: pointer to VC channel associated with this voltagedomain
 55  * @vp: pointer to VP associated with this voltagedomain
 56  * @read: read a VC/VP register
 57  * @write: write a VC/VP register
 58  * @read: read-modify-write a VC/VP register
 59  * @sys_clk: system clock name/frequency, used for various timing calculations
 60  * @scale: function used to scale the voltage of the voltagedomain
 61  * @nominal_volt: current nominal voltage for this voltage domain
 62  * @volt_data: voltage table having the distinct voltages supported
 63  *             by the domain and other associated per voltage data.
 64  */
 65 struct voltagedomain {
 66         char *name;
 67         bool scalable;
 68         struct list_head node;
 69         struct omap_vc_channel *vc;
 70         const struct omap_vfsm_instance *vfsm;
 71         struct omap_vp_instance *vp;
 72         struct omap_voltdm_pmic *pmic;
 73         struct omap_vp_param *vp_param;
 74         struct omap_vc_param *vc_param;
 75 
 76         /* VC/VP register access functions: SoC specific */
 77         u32 (*read) (u8 offset);
 78         void (*write) (u32 val, u8 offset);
 79         u32 (*rmw)(u32 mask, u32 bits, u8 offset);
 80 
 81         union {
 82                 const char *name;
 83                 u32 rate;
 84         } sys_clk;
 85 
 86         int (*scale) (struct voltagedomain *voltdm,
 87                       unsigned long target_volt);
 88 
 89         u32 nominal_volt;
 90         struct omap_volt_data *volt_data;
 91 };
 92 
 93 /* Min and max voltages from OMAP perspective */
 94 #define OMAP3430_VP1_VLIMITTO_VDDMIN    850000
 95 #define OMAP3430_VP1_VLIMITTO_VDDMAX    1425000
 96 #define OMAP3430_VP2_VLIMITTO_VDDMIN    900000
 97 #define OMAP3430_VP2_VLIMITTO_VDDMAX    1150000
 98 
 99 #define OMAP3630_VP1_VLIMITTO_VDDMIN    900000
100 #define OMAP3630_VP1_VLIMITTO_VDDMAX    1350000
101 #define OMAP3630_VP2_VLIMITTO_VDDMIN    900000
102 #define OMAP3630_VP2_VLIMITTO_VDDMAX    1200000
103 
104 #define OMAP4_VP_MPU_VLIMITTO_VDDMIN    830000
105 #define OMAP4_VP_MPU_VLIMITTO_VDDMAX    1410000
106 #define OMAP4_VP_IVA_VLIMITTO_VDDMIN    830000
107 #define OMAP4_VP_IVA_VLIMITTO_VDDMAX    1260000
108 #define OMAP4_VP_CORE_VLIMITTO_VDDMIN   830000
109 #define OMAP4_VP_CORE_VLIMITTO_VDDMAX   1200000
110 
111 /**
112  * struct omap_voltdm_pmic - PMIC specific data required by voltage driver.
113  * @slew_rate:  PMIC slew rate (in uv/us)
114  * @step_size:  PMIC voltage step size (in uv)
115  * @i2c_slave_addr: I2C slave address of PMIC
116  * @volt_reg_addr: voltage configuration register address
117  * @cmd_reg_addr: command (on, on-LP, ret, off) configuration register address
118  * @i2c_high_speed: whether VC uses I2C high-speed mode to PMIC
119  * @i2c_mcode: master code value for I2C high-speed preamble transmission
120  * @vsel_to_uv: PMIC API to convert vsel value to actual voltage in uV.
121  * @uv_to_vsel: PMIC API to convert voltage in uV to vsel value.
122  */
123 struct omap_voltdm_pmic {
124         int slew_rate;
125         int step_size;
126         u16 i2c_slave_addr;
127         u16 volt_reg_addr;
128         u16 cmd_reg_addr;
129         u8 vp_erroroffset;
130         u8 vp_vstepmin;
131         u8 vp_vstepmax;
132         u32 vddmin;
133         u32 vddmax;
134         u8 vp_timeout_us;
135         bool i2c_high_speed;
136         u32 i2c_pad_load;
137         u8 i2c_mcode;
138         unsigned long (*vsel_to_uv) (const u8 vsel);
139         u8 (*uv_to_vsel) (unsigned long uV);
140 };
141 
142 struct omap_vp_param {
143         u32 vddmax;
144         u32 vddmin;
145 };
146 
147 struct omap_vc_param {
148         u32 on;
149         u32 onlp;
150         u32 ret;
151         u32 off;
152 };
153 
154 void omap_voltage_get_volttable(struct voltagedomain *voltdm,
155                 struct omap_volt_data **volt_data);
156 struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm,
157                 unsigned long volt);
158 int omap_voltage_register_pmic(struct voltagedomain *voltdm,
159                                struct omap_voltdm_pmic *pmic);
160 int omap_voltage_late_init(void);
161 
162 extern void omap2xxx_voltagedomains_init(void);
163 extern void omap3xxx_voltagedomains_init(void);
164 extern void omap44xx_voltagedomains_init(void);
165 extern void omap54xx_voltagedomains_init(void);
166 
167 struct voltagedomain *voltdm_lookup(const char *name);
168 void voltdm_init(struct voltagedomain **voltdm_list);
169 int voltdm_add_pwrdm(struct voltagedomain *voltdm, struct powerdomain *pwrdm);
170 int voltdm_scale(struct voltagedomain *voltdm, unsigned long target_volt);
171 void voltdm_reset(struct voltagedomain *voltdm);
172 unsigned long voltdm_get_voltage(struct voltagedomain *voltdm);
173 #endif
174 

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