fc3ebd788e
Locks are moved to regmap_update_bits(), which allows to reenter internal function _regmap_update_bits() from inside of regmap read/write routines. Signed-off-by: Krystian Garbaciak <krystian.garbaciak@diasemi.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
1130 lines
26 KiB
C
1130 lines
26 KiB
C
/*
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* Register map access API
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*
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* Copyright 2011 Wolfson Microelectronics plc
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/mutex.h>
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#include <linux/err.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/regmap.h>
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#include "internal.h"
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bool regmap_writeable(struct regmap *map, unsigned int reg)
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{
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if (map->max_register && reg > map->max_register)
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return false;
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if (map->writeable_reg)
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return map->writeable_reg(map->dev, reg);
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return true;
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}
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bool regmap_readable(struct regmap *map, unsigned int reg)
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{
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if (map->max_register && reg > map->max_register)
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return false;
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if (map->format.format_write)
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return false;
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if (map->readable_reg)
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return map->readable_reg(map->dev, reg);
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return true;
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}
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bool regmap_volatile(struct regmap *map, unsigned int reg)
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{
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if (!regmap_readable(map, reg))
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return false;
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if (map->volatile_reg)
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return map->volatile_reg(map->dev, reg);
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return true;
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}
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bool regmap_precious(struct regmap *map, unsigned int reg)
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{
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if (!regmap_readable(map, reg))
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return false;
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if (map->precious_reg)
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return map->precious_reg(map->dev, reg);
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return false;
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}
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static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
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unsigned int num)
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{
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unsigned int i;
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for (i = 0; i < num; i++)
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if (!regmap_volatile(map, reg + i))
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return false;
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return true;
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}
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static void regmap_format_2_6_write(struct regmap *map,
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unsigned int reg, unsigned int val)
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{
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u8 *out = map->work_buf;
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*out = (reg << 6) | val;
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}
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static void regmap_format_4_12_write(struct regmap *map,
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unsigned int reg, unsigned int val)
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{
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__be16 *out = map->work_buf;
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*out = cpu_to_be16((reg << 12) | val);
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}
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static void regmap_format_7_9_write(struct regmap *map,
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unsigned int reg, unsigned int val)
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{
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__be16 *out = map->work_buf;
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*out = cpu_to_be16((reg << 9) | val);
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}
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static void regmap_format_10_14_write(struct regmap *map,
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unsigned int reg, unsigned int val)
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{
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u8 *out = map->work_buf;
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out[2] = val;
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out[1] = (val >> 8) | (reg << 6);
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out[0] = reg >> 2;
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}
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static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
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{
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u8 *b = buf;
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b[0] = val << shift;
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}
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static void regmap_format_16(void *buf, unsigned int val, unsigned int shift)
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{
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__be16 *b = buf;
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b[0] = cpu_to_be16(val << shift);
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}
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static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
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{
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u8 *b = buf;
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val <<= shift;
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b[0] = val >> 16;
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b[1] = val >> 8;
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b[2] = val;
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}
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static void regmap_format_32(void *buf, unsigned int val, unsigned int shift)
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{
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__be32 *b = buf;
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b[0] = cpu_to_be32(val << shift);
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}
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static unsigned int regmap_parse_8(void *buf)
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{
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u8 *b = buf;
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return b[0];
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}
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static unsigned int regmap_parse_16(void *buf)
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{
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__be16 *b = buf;
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b[0] = be16_to_cpu(b[0]);
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return b[0];
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}
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static unsigned int regmap_parse_24(void *buf)
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{
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u8 *b = buf;
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unsigned int ret = b[2];
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ret |= ((unsigned int)b[1]) << 8;
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ret |= ((unsigned int)b[0]) << 16;
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return ret;
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}
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static unsigned int regmap_parse_32(void *buf)
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{
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__be32 *b = buf;
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b[0] = be32_to_cpu(b[0]);
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return b[0];
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}
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static void regmap_lock_mutex(struct regmap *map)
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{
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mutex_lock(&map->mutex);
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}
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static void regmap_unlock_mutex(struct regmap *map)
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{
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mutex_unlock(&map->mutex);
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}
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static void regmap_lock_spinlock(struct regmap *map)
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{
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spin_lock(&map->spinlock);
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}
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static void regmap_unlock_spinlock(struct regmap *map)
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{
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spin_unlock(&map->spinlock);
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}
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static void dev_get_regmap_release(struct device *dev, void *res)
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{
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/*
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* We don't actually have anything to do here; the goal here
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* is not to manage the regmap but to provide a simple way to
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* get the regmap back given a struct device.
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*/
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}
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/**
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* regmap_init(): Initialise register map
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*
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* @dev: Device that will be interacted with
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* @bus: Bus-specific callbacks to use with device
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* @bus_context: Data passed to bus-specific callbacks
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* @config: Configuration for register map
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*
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* The return value will be an ERR_PTR() on error or a valid pointer to
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* a struct regmap. This function should generally not be called
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* directly, it should be called by bus-specific init functions.
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*/
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struct regmap *regmap_init(struct device *dev,
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const struct regmap_bus *bus,
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void *bus_context,
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const struct regmap_config *config)
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{
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struct regmap *map, **m;
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int ret = -EINVAL;
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if (!bus || !config)
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goto err;
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map = kzalloc(sizeof(*map), GFP_KERNEL);
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if (map == NULL) {
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ret = -ENOMEM;
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goto err;
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}
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if (bus->fast_io) {
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spin_lock_init(&map->spinlock);
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map->lock = regmap_lock_spinlock;
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map->unlock = regmap_unlock_spinlock;
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} else {
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mutex_init(&map->mutex);
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map->lock = regmap_lock_mutex;
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map->unlock = regmap_unlock_mutex;
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}
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map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
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map->format.pad_bytes = config->pad_bits / 8;
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map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
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map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
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config->val_bits + config->pad_bits, 8);
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map->reg_shift = config->pad_bits % 8;
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if (config->reg_stride)
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map->reg_stride = config->reg_stride;
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else
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map->reg_stride = 1;
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map->use_single_rw = config->use_single_rw;
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map->dev = dev;
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map->bus = bus;
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map->bus_context = bus_context;
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map->max_register = config->max_register;
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map->writeable_reg = config->writeable_reg;
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map->readable_reg = config->readable_reg;
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map->volatile_reg = config->volatile_reg;
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map->precious_reg = config->precious_reg;
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map->cache_type = config->cache_type;
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map->name = config->name;
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if (config->read_flag_mask || config->write_flag_mask) {
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map->read_flag_mask = config->read_flag_mask;
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map->write_flag_mask = config->write_flag_mask;
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} else {
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map->read_flag_mask = bus->read_flag_mask;
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}
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switch (config->reg_bits + map->reg_shift) {
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case 2:
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switch (config->val_bits) {
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case 6:
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map->format.format_write = regmap_format_2_6_write;
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break;
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default:
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goto err_map;
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}
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break;
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case 4:
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switch (config->val_bits) {
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case 12:
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map->format.format_write = regmap_format_4_12_write;
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break;
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default:
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goto err_map;
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}
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break;
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case 7:
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switch (config->val_bits) {
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case 9:
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map->format.format_write = regmap_format_7_9_write;
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break;
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default:
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goto err_map;
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}
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break;
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case 10:
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switch (config->val_bits) {
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case 14:
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map->format.format_write = regmap_format_10_14_write;
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break;
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default:
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goto err_map;
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}
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break;
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case 8:
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map->format.format_reg = regmap_format_8;
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break;
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case 16:
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map->format.format_reg = regmap_format_16;
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break;
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case 32:
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map->format.format_reg = regmap_format_32;
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break;
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default:
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goto err_map;
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}
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switch (config->val_bits) {
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case 8:
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map->format.format_val = regmap_format_8;
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map->format.parse_val = regmap_parse_8;
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break;
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case 16:
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map->format.format_val = regmap_format_16;
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map->format.parse_val = regmap_parse_16;
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break;
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case 24:
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map->format.format_val = regmap_format_24;
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map->format.parse_val = regmap_parse_24;
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break;
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case 32:
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map->format.format_val = regmap_format_32;
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map->format.parse_val = regmap_parse_32;
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break;
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}
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if (map->format.format_write)
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map->use_single_rw = true;
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if (!map->format.format_write &&
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!(map->format.format_reg && map->format.format_val))
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goto err_map;
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map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
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if (map->work_buf == NULL) {
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ret = -ENOMEM;
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goto err_map;
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}
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regmap_debugfs_init(map, config->name);
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ret = regcache_init(map, config);
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if (ret < 0)
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goto err_debugfs;
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/* Add a devres resource for dev_get_regmap() */
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m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
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if (!m) {
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ret = -ENOMEM;
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goto err_cache;
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}
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*m = map;
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devres_add(dev, m);
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return map;
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err_cache:
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regcache_exit(map);
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err_debugfs:
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regmap_debugfs_exit(map);
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kfree(map->work_buf);
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err_map:
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kfree(map);
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err:
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(regmap_init);
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static void devm_regmap_release(struct device *dev, void *res)
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{
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regmap_exit(*(struct regmap **)res);
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}
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/**
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* devm_regmap_init(): Initialise managed register map
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*
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* @dev: Device that will be interacted with
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* @bus: Bus-specific callbacks to use with device
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* @bus_context: Data passed to bus-specific callbacks
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* @config: Configuration for register map
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*
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* The return value will be an ERR_PTR() on error or a valid pointer
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* to a struct regmap. This function should generally not be called
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* directly, it should be called by bus-specific init functions. The
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* map will be automatically freed by the device management code.
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*/
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struct regmap *devm_regmap_init(struct device *dev,
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const struct regmap_bus *bus,
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void *bus_context,
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const struct regmap_config *config)
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{
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struct regmap **ptr, *regmap;
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ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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regmap = regmap_init(dev, bus, bus_context, config);
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if (!IS_ERR(regmap)) {
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*ptr = regmap;
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devres_add(dev, ptr);
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} else {
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devres_free(ptr);
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}
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return regmap;
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}
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EXPORT_SYMBOL_GPL(devm_regmap_init);
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/**
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* regmap_reinit_cache(): Reinitialise the current register cache
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*
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* @map: Register map to operate on.
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* @config: New configuration. Only the cache data will be used.
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*
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* Discard any existing register cache for the map and initialize a
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* new cache. This can be used to restore the cache to defaults or to
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* update the cache configuration to reflect runtime discovery of the
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* hardware.
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*/
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int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
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{
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int ret;
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map->lock(map);
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regcache_exit(map);
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regmap_debugfs_exit(map);
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map->max_register = config->max_register;
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map->writeable_reg = config->writeable_reg;
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map->readable_reg = config->readable_reg;
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map->volatile_reg = config->volatile_reg;
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map->precious_reg = config->precious_reg;
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map->cache_type = config->cache_type;
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regmap_debugfs_init(map, config->name);
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map->cache_bypass = false;
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map->cache_only = false;
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ret = regcache_init(map, config);
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map->unlock(map);
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return ret;
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}
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EXPORT_SYMBOL_GPL(regmap_reinit_cache);
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/**
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* regmap_exit(): Free a previously allocated register map
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*/
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void regmap_exit(struct regmap *map)
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{
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regcache_exit(map);
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regmap_debugfs_exit(map);
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if (map->bus->free_context)
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map->bus->free_context(map->bus_context);
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kfree(map->work_buf);
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kfree(map);
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}
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EXPORT_SYMBOL_GPL(regmap_exit);
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static int dev_get_regmap_match(struct device *dev, void *res, void *data)
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{
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struct regmap **r = res;
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if (!r || !*r) {
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WARN_ON(!r || !*r);
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return 0;
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}
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/* If the user didn't specify a name match any */
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if (data)
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return (*r)->name == data;
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else
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return 1;
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}
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|
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/**
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* dev_get_regmap(): Obtain the regmap (if any) for a device
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*
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* @dev: Device to retrieve the map for
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* @name: Optional name for the register map, usually NULL.
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*
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* Returns the regmap for the device if one is present, or NULL. If
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* name is specified then it must match the name specified when
|
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* registering the device, if it is NULL then the first regmap found
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* will be used. Devices with multiple register maps are very rare,
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* generic code should normally not need to specify a name.
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*/
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struct regmap *dev_get_regmap(struct device *dev, const char *name)
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{
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struct regmap **r = devres_find(dev, dev_get_regmap_release,
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dev_get_regmap_match, (void *)name);
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|
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if (!r)
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return NULL;
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return *r;
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}
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EXPORT_SYMBOL_GPL(dev_get_regmap);
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|
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static int _regmap_raw_write(struct regmap *map, unsigned int reg,
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const void *val, size_t val_len)
|
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{
|
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u8 *u8 = map->work_buf;
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void *buf;
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int ret = -ENOTSUPP;
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size_t len;
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int i;
|
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|
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/* Check for unwritable registers before we start */
|
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if (map->writeable_reg)
|
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for (i = 0; i < val_len / map->format.val_bytes; i++)
|
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if (!map->writeable_reg(map->dev,
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reg + (i * map->reg_stride)))
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return -EINVAL;
|
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|
|
if (!map->cache_bypass && map->format.parse_val) {
|
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unsigned int ival;
|
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int val_bytes = map->format.val_bytes;
|
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for (i = 0; i < val_len / val_bytes; i++) {
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memcpy(map->work_buf, val + (i * val_bytes), val_bytes);
|
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ival = map->format.parse_val(map->work_buf);
|
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ret = regcache_write(map, reg + (i * map->reg_stride),
|
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ival);
|
|
if (ret) {
|
|
dev_err(map->dev,
|
|
"Error in caching of register: %u ret: %d\n",
|
|
reg + i, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
if (map->cache_only) {
|
|
map->cache_dirty = true;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
map->format.format_reg(map->work_buf, reg, map->reg_shift);
|
|
|
|
u8[0] |= map->write_flag_mask;
|
|
|
|
trace_regmap_hw_write_start(map->dev, reg,
|
|
val_len / map->format.val_bytes);
|
|
|
|
/* If we're doing a single register write we can probably just
|
|
* send the work_buf directly, otherwise try to do a gather
|
|
* write.
|
|
*/
|
|
if (val == (map->work_buf + map->format.pad_bytes +
|
|
map->format.reg_bytes))
|
|
ret = map->bus->write(map->bus_context, map->work_buf,
|
|
map->format.reg_bytes +
|
|
map->format.pad_bytes +
|
|
val_len);
|
|
else if (map->bus->gather_write)
|
|
ret = map->bus->gather_write(map->bus_context, map->work_buf,
|
|
map->format.reg_bytes +
|
|
map->format.pad_bytes,
|
|
val, val_len);
|
|
|
|
/* If that didn't work fall back on linearising by hand. */
|
|
if (ret == -ENOTSUPP) {
|
|
len = map->format.reg_bytes + map->format.pad_bytes + val_len;
|
|
buf = kzalloc(len, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
memcpy(buf, map->work_buf, map->format.reg_bytes);
|
|
memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
|
|
val, val_len);
|
|
ret = map->bus->write(map->bus_context, buf, len);
|
|
|
|
kfree(buf);
|
|
}
|
|
|
|
trace_regmap_hw_write_done(map->dev, reg,
|
|
val_len / map->format.val_bytes);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int _regmap_write(struct regmap *map, unsigned int reg,
|
|
unsigned int val)
|
|
{
|
|
int ret;
|
|
BUG_ON(!map->format.format_write && !map->format.format_val);
|
|
|
|
if (!map->cache_bypass && map->format.format_write) {
|
|
ret = regcache_write(map, reg, val);
|
|
if (ret != 0)
|
|
return ret;
|
|
if (map->cache_only) {
|
|
map->cache_dirty = true;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
trace_regmap_reg_write(map->dev, reg, val);
|
|
|
|
if (map->format.format_write) {
|
|
map->format.format_write(map, reg, val);
|
|
|
|
trace_regmap_hw_write_start(map->dev, reg, 1);
|
|
|
|
ret = map->bus->write(map->bus_context, map->work_buf,
|
|
map->format.buf_size);
|
|
|
|
trace_regmap_hw_write_done(map->dev, reg, 1);
|
|
|
|
return ret;
|
|
} else {
|
|
map->format.format_val(map->work_buf + map->format.reg_bytes
|
|
+ map->format.pad_bytes, val, 0);
|
|
return _regmap_raw_write(map, reg,
|
|
map->work_buf +
|
|
map->format.reg_bytes +
|
|
map->format.pad_bytes,
|
|
map->format.val_bytes);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* regmap_write(): Write a value to a single register
|
|
*
|
|
* @map: Register map to write to
|
|
* @reg: Register to write to
|
|
* @val: Value to be written
|
|
*
|
|
* A value of zero will be returned on success, a negative errno will
|
|
* be returned in error cases.
|
|
*/
|
|
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
|
|
{
|
|
int ret;
|
|
|
|
if (reg % map->reg_stride)
|
|
return -EINVAL;
|
|
|
|
map->lock(map);
|
|
|
|
ret = _regmap_write(map, reg, val);
|
|
|
|
map->unlock(map);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(regmap_write);
|
|
|
|
/**
|
|
* regmap_raw_write(): Write raw values to one or more registers
|
|
*
|
|
* @map: Register map to write to
|
|
* @reg: Initial register to write to
|
|
* @val: Block of data to be written, laid out for direct transmission to the
|
|
* device
|
|
* @val_len: Length of data pointed to by val.
|
|
*
|
|
* This function is intended to be used for things like firmware
|
|
* download where a large block of data needs to be transferred to the
|
|
* device. No formatting will be done on the data provided.
|
|
*
|
|
* A value of zero will be returned on success, a negative errno will
|
|
* be returned in error cases.
|
|
*/
|
|
int regmap_raw_write(struct regmap *map, unsigned int reg,
|
|
const void *val, size_t val_len)
|
|
{
|
|
int ret;
|
|
|
|
if (val_len % map->format.val_bytes)
|
|
return -EINVAL;
|
|
if (reg % map->reg_stride)
|
|
return -EINVAL;
|
|
|
|
map->lock(map);
|
|
|
|
ret = _regmap_raw_write(map, reg, val, val_len);
|
|
|
|
map->unlock(map);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(regmap_raw_write);
|
|
|
|
/*
|
|
* regmap_bulk_write(): Write multiple registers to the device
|
|
*
|
|
* @map: Register map to write to
|
|
* @reg: First register to be write from
|
|
* @val: Block of data to be written, in native register size for device
|
|
* @val_count: Number of registers to write
|
|
*
|
|
* This function is intended to be used for writing a large block of
|
|
* data to be device either in single transfer or multiple transfer.
|
|
*
|
|
* A value of zero will be returned on success, a negative errno will
|
|
* be returned in error cases.
|
|
*/
|
|
int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
|
|
size_t val_count)
|
|
{
|
|
int ret = 0, i;
|
|
size_t val_bytes = map->format.val_bytes;
|
|
void *wval;
|
|
|
|
if (!map->format.parse_val)
|
|
return -EINVAL;
|
|
if (reg % map->reg_stride)
|
|
return -EINVAL;
|
|
|
|
map->lock(map);
|
|
|
|
/* No formatting is require if val_byte is 1 */
|
|
if (val_bytes == 1) {
|
|
wval = (void *)val;
|
|
} else {
|
|
wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
|
|
if (!wval) {
|
|
ret = -ENOMEM;
|
|
dev_err(map->dev, "Error in memory allocation\n");
|
|
goto out;
|
|
}
|
|
for (i = 0; i < val_count * val_bytes; i += val_bytes)
|
|
map->format.parse_val(wval + i);
|
|
}
|
|
/*
|
|
* Some devices does not support bulk write, for
|
|
* them we have a series of single write operations.
|
|
*/
|
|
if (map->use_single_rw) {
|
|
for (i = 0; i < val_count; i++) {
|
|
ret = regmap_raw_write(map,
|
|
reg + (i * map->reg_stride),
|
|
val + (i * val_bytes),
|
|
val_bytes);
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
} else {
|
|
ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
|
|
}
|
|
|
|
if (val_bytes != 1)
|
|
kfree(wval);
|
|
|
|
out:
|
|
map->unlock(map);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(regmap_bulk_write);
|
|
|
|
static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
|
|
unsigned int val_len)
|
|
{
|
|
u8 *u8 = map->work_buf;
|
|
int ret;
|
|
|
|
map->format.format_reg(map->work_buf, reg, map->reg_shift);
|
|
|
|
/*
|
|
* Some buses or devices flag reads by setting the high bits in the
|
|
* register addresss; since it's always the high bits for all
|
|
* current formats we can do this here rather than in
|
|
* formatting. This may break if we get interesting formats.
|
|
*/
|
|
u8[0] |= map->read_flag_mask;
|
|
|
|
trace_regmap_hw_read_start(map->dev, reg,
|
|
val_len / map->format.val_bytes);
|
|
|
|
ret = map->bus->read(map->bus_context, map->work_buf,
|
|
map->format.reg_bytes + map->format.pad_bytes,
|
|
val, val_len);
|
|
|
|
trace_regmap_hw_read_done(map->dev, reg,
|
|
val_len / map->format.val_bytes);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int _regmap_read(struct regmap *map, unsigned int reg,
|
|
unsigned int *val)
|
|
{
|
|
int ret;
|
|
|
|
if (!map->cache_bypass) {
|
|
ret = regcache_read(map, reg, val);
|
|
if (ret == 0)
|
|
return 0;
|
|
}
|
|
|
|
if (!map->format.parse_val)
|
|
return -EINVAL;
|
|
|
|
if (map->cache_only)
|
|
return -EBUSY;
|
|
|
|
ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
|
|
if (ret == 0) {
|
|
*val = map->format.parse_val(map->work_buf);
|
|
trace_regmap_reg_read(map->dev, reg, *val);
|
|
}
|
|
|
|
if (ret == 0 && !map->cache_bypass)
|
|
regcache_write(map, reg, *val);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* regmap_read(): Read a value from a single register
|
|
*
|
|
* @map: Register map to write to
|
|
* @reg: Register to be read from
|
|
* @val: Pointer to store read value
|
|
*
|
|
* A value of zero will be returned on success, a negative errno will
|
|
* be returned in error cases.
|
|
*/
|
|
int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
|
|
{
|
|
int ret;
|
|
|
|
if (reg % map->reg_stride)
|
|
return -EINVAL;
|
|
|
|
map->lock(map);
|
|
|
|
ret = _regmap_read(map, reg, val);
|
|
|
|
map->unlock(map);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(regmap_read);
|
|
|
|
/**
|
|
* regmap_raw_read(): Read raw data from the device
|
|
*
|
|
* @map: Register map to write to
|
|
* @reg: First register to be read from
|
|
* @val: Pointer to store read value
|
|
* @val_len: Size of data to read
|
|
*
|
|
* A value of zero will be returned on success, a negative errno will
|
|
* be returned in error cases.
|
|
*/
|
|
int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
|
|
size_t val_len)
|
|
{
|
|
size_t val_bytes = map->format.val_bytes;
|
|
size_t val_count = val_len / val_bytes;
|
|
unsigned int v;
|
|
int ret, i;
|
|
|
|
if (val_len % map->format.val_bytes)
|
|
return -EINVAL;
|
|
if (reg % map->reg_stride)
|
|
return -EINVAL;
|
|
|
|
map->lock(map);
|
|
|
|
if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
|
|
map->cache_type == REGCACHE_NONE) {
|
|
/* Physical block read if there's no cache involved */
|
|
ret = _regmap_raw_read(map, reg, val, val_len);
|
|
|
|
} else {
|
|
/* Otherwise go word by word for the cache; should be low
|
|
* cost as we expect to hit the cache.
|
|
*/
|
|
for (i = 0; i < val_count; i++) {
|
|
ret = _regmap_read(map, reg + (i * map->reg_stride),
|
|
&v);
|
|
if (ret != 0)
|
|
goto out;
|
|
|
|
map->format.format_val(val + (i * val_bytes), v, 0);
|
|
}
|
|
}
|
|
|
|
out:
|
|
map->unlock(map);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(regmap_raw_read);
|
|
|
|
/**
|
|
* regmap_bulk_read(): Read multiple registers from the device
|
|
*
|
|
* @map: Register map to write to
|
|
* @reg: First register to be read from
|
|
* @val: Pointer to store read value, in native register size for device
|
|
* @val_count: Number of registers to read
|
|
*
|
|
* A value of zero will be returned on success, a negative errno will
|
|
* be returned in error cases.
|
|
*/
|
|
int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
|
|
size_t val_count)
|
|
{
|
|
int ret, i;
|
|
size_t val_bytes = map->format.val_bytes;
|
|
bool vol = regmap_volatile_range(map, reg, val_count);
|
|
|
|
if (!map->format.parse_val)
|
|
return -EINVAL;
|
|
if (reg % map->reg_stride)
|
|
return -EINVAL;
|
|
|
|
if (vol || map->cache_type == REGCACHE_NONE) {
|
|
/*
|
|
* Some devices does not support bulk read, for
|
|
* them we have a series of single read operations.
|
|
*/
|
|
if (map->use_single_rw) {
|
|
for (i = 0; i < val_count; i++) {
|
|
ret = regmap_raw_read(map,
|
|
reg + (i * map->reg_stride),
|
|
val + (i * val_bytes),
|
|
val_bytes);
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
} else {
|
|
ret = regmap_raw_read(map, reg, val,
|
|
val_bytes * val_count);
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
|
|
for (i = 0; i < val_count * val_bytes; i += val_bytes)
|
|
map->format.parse_val(val + i);
|
|
} else {
|
|
for (i = 0; i < val_count; i++) {
|
|
unsigned int ival;
|
|
ret = regmap_read(map, reg + (i * map->reg_stride),
|
|
&ival);
|
|
if (ret != 0)
|
|
return ret;
|
|
memcpy(val + (i * val_bytes), &ival, val_bytes);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(regmap_bulk_read);
|
|
|
|
static int _regmap_update_bits(struct regmap *map, unsigned int reg,
|
|
unsigned int mask, unsigned int val,
|
|
bool *change)
|
|
{
|
|
int ret;
|
|
unsigned int tmp, orig;
|
|
|
|
ret = _regmap_read(map, reg, &orig);
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
tmp = orig & ~mask;
|
|
tmp |= val & mask;
|
|
|
|
if (tmp != orig) {
|
|
ret = _regmap_write(map, reg, tmp);
|
|
*change = true;
|
|
} else {
|
|
*change = false;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* regmap_update_bits: Perform a read/modify/write cycle on the register map
|
|
*
|
|
* @map: Register map to update
|
|
* @reg: Register to update
|
|
* @mask: Bitmask to change
|
|
* @val: New value for bitmask
|
|
*
|
|
* Returns zero for success, a negative number on error.
|
|
*/
|
|
int regmap_update_bits(struct regmap *map, unsigned int reg,
|
|
unsigned int mask, unsigned int val)
|
|
{
|
|
bool change;
|
|
int ret;
|
|
|
|
map->lock(map);
|
|
ret = _regmap_update_bits(map, reg, mask, val, &change);
|
|
map->unlock(map);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(regmap_update_bits);
|
|
|
|
/**
|
|
* regmap_update_bits_check: Perform a read/modify/write cycle on the
|
|
* register map and report if updated
|
|
*
|
|
* @map: Register map to update
|
|
* @reg: Register to update
|
|
* @mask: Bitmask to change
|
|
* @val: New value for bitmask
|
|
* @change: Boolean indicating if a write was done
|
|
*
|
|
* Returns zero for success, a negative number on error.
|
|
*/
|
|
int regmap_update_bits_check(struct regmap *map, unsigned int reg,
|
|
unsigned int mask, unsigned int val,
|
|
bool *change)
|
|
{
|
|
int ret;
|
|
|
|
map->lock(map);
|
|
ret = _regmap_update_bits(map, reg, mask, val, change);
|
|
map->unlock(map);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(regmap_update_bits_check);
|
|
|
|
/**
|
|
* regmap_register_patch: Register and apply register updates to be applied
|
|
* on device initialistion
|
|
*
|
|
* @map: Register map to apply updates to.
|
|
* @regs: Values to update.
|
|
* @num_regs: Number of entries in regs.
|
|
*
|
|
* Register a set of register updates to be applied to the device
|
|
* whenever the device registers are synchronised with the cache and
|
|
* apply them immediately. Typically this is used to apply
|
|
* corrections to be applied to the device defaults on startup, such
|
|
* as the updates some vendors provide to undocumented registers.
|
|
*/
|
|
int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
|
|
int num_regs)
|
|
{
|
|
int i, ret;
|
|
bool bypass;
|
|
|
|
/* If needed the implementation can be extended to support this */
|
|
if (map->patch)
|
|
return -EBUSY;
|
|
|
|
map->lock(map);
|
|
|
|
bypass = map->cache_bypass;
|
|
|
|
map->cache_bypass = true;
|
|
|
|
/* Write out first; it's useful to apply even if we fail later. */
|
|
for (i = 0; i < num_regs; i++) {
|
|
ret = _regmap_write(map, regs[i].reg, regs[i].def);
|
|
if (ret != 0) {
|
|
dev_err(map->dev, "Failed to write %x = %x: %d\n",
|
|
regs[i].reg, regs[i].def, ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL);
|
|
if (map->patch != NULL) {
|
|
memcpy(map->patch, regs,
|
|
num_regs * sizeof(struct reg_default));
|
|
map->patch_regs = num_regs;
|
|
} else {
|
|
ret = -ENOMEM;
|
|
}
|
|
|
|
out:
|
|
map->cache_bypass = bypass;
|
|
|
|
map->unlock(map);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(regmap_register_patch);
|
|
|
|
/*
|
|
* regmap_get_val_bytes(): Report the size of a register value
|
|
*
|
|
* Report the size of a register value, mainly intended to for use by
|
|
* generic infrastructure built on top of regmap.
|
|
*/
|
|
int regmap_get_val_bytes(struct regmap *map)
|
|
{
|
|
if (map->format.format_write)
|
|
return -EINVAL;
|
|
|
|
return map->format.val_bytes;
|
|
}
|
|
EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
|
|
|
|
static int __init regmap_initcall(void)
|
|
{
|
|
regmap_debugfs_initcall();
|
|
|
|
return 0;
|
|
}
|
|
postcore_initcall(regmap_initcall);
|