linux-imx

/*

 * Split TWL6030 logic from twl-regulator.c:

 * Copyright (C) 2008 David Brownell

 *

 * Copyright (C) 2016 Nicolae Rosia <nicolae.rosia@gmail.com>

 * 

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 */

​

#include <linux/module.h>

#include <linux/string.h>

#include <linux/slab.h>

#include <linux/init.h>

#include <linux/err.h>

#include <linux/platform_device.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/machine.h>

#include <linux/regulator/of_regulator.h>

#include <linux/mfd/twl.h>

#include <linux/delay.h>

​

struct twlreg_info {

    /* start of regulator's PM_RECEIVER control register bank */

    u8          base;

​

    /* twl resource ID, for resource control state machine */

    u8          id;

​

    u8          flags;

​

    /* used by regulator core */

    struct regulator_desc   desc;

​

    /* chip specific features */

    unsigned long       features;

​

    /* data passed from board for external get/set voltage */

    void            *data;

};

​

​

/* LDO control registers ... offset is from the base of its register bank.

 * The first three registers of all power resource banks help hardware to

 * manage the various resource groups.

 */

/* Common offset in TWL4030/6030 */

#define VREG_GRP        0

/* TWL6030 register offsets */

#define VREG_TRANS      1

#define VREG_STATE      2

#define VREG_VOLTAGE        3

#define VREG_VOLTAGE_SMPS   4

/* TWL6030 Misc register offsets */

#define VREG_BC_ALL     1

#define VREG_BC_REF     2

#define VREG_BC_PROC        3

#define VREG_BC_CLK_RST     4

​

/* TWL6030 LDO register values for CFG_STATE */

#define TWL6030_CFG_STATE_OFF   0x00

#define TWL6030_CFG_STATE_ON    0x01

#define TWL6030_CFG_STATE_OFF2  0x02

#define TWL6030_CFG_STATE_SLEEP 0x03

#define TWL6030_CFG_STATE_GRP_SHIFT 5

#define TWL6030_CFG_STATE_APP_SHIFT 2

#define TWL6030_CFG_STATE_APP_MASK  (0x03 << TWL6030_CFG_STATE_APP_SHIFT)

#define TWL6030_CFG_STATE_APP(v)    (((v) & TWL6030_CFG_STATE_APP_MASK) >>\

                        TWL6030_CFG_STATE_APP_SHIFT)

​

/* Flags for SMPS Voltage reading */

#define SMPS_OFFSET_EN      BIT(0)

#define SMPS_EXTENDED_EN    BIT(1)

​

/* twl6032 SMPS EPROM values */

#define TWL6030_SMPS_OFFSET     0xB0

#define TWL6030_SMPS_MULT       0xB3

#define SMPS_MULTOFFSET_SMPS4   BIT(0)

#define SMPS_MULTOFFSET_VIO BIT(1)

#define SMPS_MULTOFFSET_SMPS3   BIT(6)

​

static inline int

twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)

{

    u8 value;

    int status;

​

    status = twl_i2c_read_u8(slave_subgp,