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linux/sound/soc/soc-cache.c
Mark Brown c9016a7937 ASoC: Remove LZO cache type
There are no current users and new drivers ought to be using the regmap
API and its cache implementation directly so just delete the ASoC copy.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-11-10 13:08:09 +00:00

722 lines
18 KiB
C

/*
* soc-cache.c -- ASoC register cache helpers
*
* Copyright 2009 Wolfson Microelectronics PLC.
*
* Author: Mark Brown <broonie@opensource.wolfsonmicro.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/i2c.h>
#include <linux/spi/spi.h>
#include <sound/soc.h>
#include <linux/bitmap.h>
#include <linux/rbtree.h>
#include <linux/export.h>
#include <trace/events/asoc.h>
static bool snd_soc_set_cache_val(void *base, unsigned int idx,
unsigned int val, unsigned int word_size)
{
switch (word_size) {
case 1: {
u8 *cache = base;
if (cache[idx] == val)
return true;
cache[idx] = val;
break;
}
case 2: {
u16 *cache = base;
if (cache[idx] == val)
return true;
cache[idx] = val;
break;
}
default:
BUG();
}
return false;
}
static unsigned int snd_soc_get_cache_val(const void *base, unsigned int idx,
unsigned int word_size)
{
if (!base)
return -1;
switch (word_size) {
case 1: {
const u8 *cache = base;
return cache[idx];
}
case 2: {
const u16 *cache = base;
return cache[idx];
}
default:
BUG();
}
/* unreachable */
return -1;
}
struct snd_soc_rbtree_node {
struct rb_node node; /* the actual rbtree node holding this block */
unsigned int base_reg; /* base register handled by this block */
unsigned int word_size; /* number of bytes needed to represent the register index */
void *block; /* block of adjacent registers */
unsigned int blklen; /* number of registers available in the block */
} __attribute__ ((packed));
struct snd_soc_rbtree_ctx {
struct rb_root root;
struct snd_soc_rbtree_node *cached_rbnode;
};
static inline void snd_soc_rbtree_get_base_top_reg(
struct snd_soc_rbtree_node *rbnode,
unsigned int *base, unsigned int *top)
{
*base = rbnode->base_reg;
*top = rbnode->base_reg + rbnode->blklen - 1;
}
static unsigned int snd_soc_rbtree_get_register(
struct snd_soc_rbtree_node *rbnode, unsigned int idx)
{
unsigned int val;
switch (rbnode->word_size) {
case 1: {
u8 *p = rbnode->block;
val = p[idx];
return val;
}
case 2: {
u16 *p = rbnode->block;
val = p[idx];
return val;
}
default:
BUG();
break;
}
return -1;
}
static void snd_soc_rbtree_set_register(struct snd_soc_rbtree_node *rbnode,
unsigned int idx, unsigned int val)
{
switch (rbnode->word_size) {
case 1: {
u8 *p = rbnode->block;
p[idx] = val;
break;
}
case 2: {
u16 *p = rbnode->block;
p[idx] = val;
break;
}
default:
BUG();
break;
}
}
static struct snd_soc_rbtree_node *snd_soc_rbtree_lookup(
struct rb_root *root, unsigned int reg)
{
struct rb_node *node;
struct snd_soc_rbtree_node *rbnode;
unsigned int base_reg, top_reg;
node = root->rb_node;
while (node) {
rbnode = container_of(node, struct snd_soc_rbtree_node, node);
snd_soc_rbtree_get_base_top_reg(rbnode, &base_reg, &top_reg);
if (reg >= base_reg && reg <= top_reg)
return rbnode;
else if (reg > top_reg)
node = node->rb_right;
else if (reg < base_reg)
node = node->rb_left;
}
return NULL;
}
static int snd_soc_rbtree_insert(struct rb_root *root,
struct snd_soc_rbtree_node *rbnode)
{
struct rb_node **new, *parent;
struct snd_soc_rbtree_node *rbnode_tmp;
unsigned int base_reg_tmp, top_reg_tmp;
unsigned int base_reg;
parent = NULL;
new = &root->rb_node;
while (*new) {
rbnode_tmp = container_of(*new, struct snd_soc_rbtree_node,
node);
/* base and top registers of the current rbnode */
snd_soc_rbtree_get_base_top_reg(rbnode_tmp, &base_reg_tmp,
&top_reg_tmp);
/* base register of the rbnode to be added */
base_reg = rbnode->base_reg;
parent = *new;
/* if this register has already been inserted, just return */
if (base_reg >= base_reg_tmp &&
base_reg <= top_reg_tmp)
return 0;
else if (base_reg > top_reg_tmp)
new = &((*new)->rb_right);
else if (base_reg < base_reg_tmp)
new = &((*new)->rb_left);
}
/* insert the node into the rbtree */
rb_link_node(&rbnode->node, parent, new);
rb_insert_color(&rbnode->node, root);
return 1;
}
static int snd_soc_rbtree_cache_sync(struct snd_soc_codec *codec)
{
struct snd_soc_rbtree_ctx *rbtree_ctx;
struct rb_node *node;
struct snd_soc_rbtree_node *rbnode;
unsigned int regtmp;
unsigned int val, def;
int ret;
int i;
rbtree_ctx = codec->reg_cache;
for (node = rb_first(&rbtree_ctx->root); node; node = rb_next(node)) {
rbnode = rb_entry(node, struct snd_soc_rbtree_node, node);
for (i = 0; i < rbnode->blklen; ++i) {
regtmp = rbnode->base_reg + i;
val = snd_soc_rbtree_get_register(rbnode, i);
def = snd_soc_get_cache_val(codec->reg_def_copy, i,
rbnode->word_size);
if (val == def)
continue;
WARN_ON(!snd_soc_codec_writable_register(codec, regtmp));
codec->cache_bypass = 1;
ret = snd_soc_write(codec, regtmp, val);
codec->cache_bypass = 0;
if (ret)
return ret;
dev_dbg(codec->dev, "Synced register %#x, value = %#x\n",
regtmp, val);
}
}
return 0;
}
static int snd_soc_rbtree_insert_to_block(struct snd_soc_rbtree_node *rbnode,
unsigned int pos, unsigned int reg,
unsigned int value)
{
u8 *blk;
blk = krealloc(rbnode->block,
(rbnode->blklen + 1) * rbnode->word_size, GFP_KERNEL);
if (!blk)
return -ENOMEM;
/* insert the register value in the correct place in the rbnode block */
memmove(blk + (pos + 1) * rbnode->word_size,
blk + pos * rbnode->word_size,
(rbnode->blklen - pos) * rbnode->word_size);
/* update the rbnode block, its size and the base register */
rbnode->block = blk;
rbnode->blklen++;
if (!pos)
rbnode->base_reg = reg;
snd_soc_rbtree_set_register(rbnode, pos, value);
return 0;
}
static int snd_soc_rbtree_cache_write(struct snd_soc_codec *codec,
unsigned int reg, unsigned int value)
{
struct snd_soc_rbtree_ctx *rbtree_ctx;
struct snd_soc_rbtree_node *rbnode, *rbnode_tmp;
struct rb_node *node;
unsigned int val;
unsigned int reg_tmp;
unsigned int base_reg, top_reg;
unsigned int pos;
int i;
int ret;
rbtree_ctx = codec->reg_cache;
/* look up the required register in the cached rbnode */
rbnode = rbtree_ctx->cached_rbnode;
if (rbnode) {
snd_soc_rbtree_get_base_top_reg(rbnode, &base_reg, &top_reg);
if (reg >= base_reg && reg <= top_reg) {
reg_tmp = reg - base_reg;
val = snd_soc_rbtree_get_register(rbnode, reg_tmp);
if (val == value)
return 0;
snd_soc_rbtree_set_register(rbnode, reg_tmp, value);
return 0;
}
}
/* if we can't locate it in the cached rbnode we'll have
* to traverse the rbtree looking for it.
*/
rbnode = snd_soc_rbtree_lookup(&rbtree_ctx->root, reg);
if (rbnode) {
reg_tmp = reg - rbnode->base_reg;
val = snd_soc_rbtree_get_register(rbnode, reg_tmp);
if (val == value)
return 0;
snd_soc_rbtree_set_register(rbnode, reg_tmp, value);
rbtree_ctx->cached_rbnode = rbnode;
} else {
/* bail out early, no need to create the rbnode yet */
if (!value)
return 0;
/* look for an adjacent register to the one we are about to add */
for (node = rb_first(&rbtree_ctx->root); node;
node = rb_next(node)) {
rbnode_tmp = rb_entry(node, struct snd_soc_rbtree_node, node);
for (i = 0; i < rbnode_tmp->blklen; ++i) {
reg_tmp = rbnode_tmp->base_reg + i;
if (abs(reg_tmp - reg) != 1)
continue;
/* decide where in the block to place our register */
if (reg_tmp + 1 == reg)
pos = i + 1;
else
pos = i;
ret = snd_soc_rbtree_insert_to_block(rbnode_tmp, pos,
reg, value);
if (ret)
return ret;
rbtree_ctx->cached_rbnode = rbnode_tmp;
return 0;
}
}
/* we did not manage to find a place to insert it in an existing
* block so create a new rbnode with a single register in its block.
* This block will get populated further if any other adjacent
* registers get modified in the future.
*/
rbnode = kzalloc(sizeof *rbnode, GFP_KERNEL);
if (!rbnode)
return -ENOMEM;
rbnode->blklen = 1;
rbnode->base_reg = reg;
rbnode->word_size = codec->driver->reg_word_size;
rbnode->block = kmalloc(rbnode->blklen * rbnode->word_size,
GFP_KERNEL);
if (!rbnode->block) {
kfree(rbnode);
return -ENOMEM;
}
snd_soc_rbtree_set_register(rbnode, 0, value);
snd_soc_rbtree_insert(&rbtree_ctx->root, rbnode);
rbtree_ctx->cached_rbnode = rbnode;
}
return 0;
}
static int snd_soc_rbtree_cache_read(struct snd_soc_codec *codec,
unsigned int reg, unsigned int *value)
{
struct snd_soc_rbtree_ctx *rbtree_ctx;
struct snd_soc_rbtree_node *rbnode;
unsigned int base_reg, top_reg;
unsigned int reg_tmp;
rbtree_ctx = codec->reg_cache;
/* look up the required register in the cached rbnode */
rbnode = rbtree_ctx->cached_rbnode;
if (rbnode) {
snd_soc_rbtree_get_base_top_reg(rbnode, &base_reg, &top_reg);
if (reg >= base_reg && reg <= top_reg) {
reg_tmp = reg - base_reg;
*value = snd_soc_rbtree_get_register(rbnode, reg_tmp);
return 0;
}
}
/* if we can't locate it in the cached rbnode we'll have
* to traverse the rbtree looking for it.
*/
rbnode = snd_soc_rbtree_lookup(&rbtree_ctx->root, reg);
if (rbnode) {
reg_tmp = reg - rbnode->base_reg;
*value = snd_soc_rbtree_get_register(rbnode, reg_tmp);
rbtree_ctx->cached_rbnode = rbnode;
} else {
/* uninitialized registers default to 0 */
*value = 0;
}
return 0;
}
static int snd_soc_rbtree_cache_exit(struct snd_soc_codec *codec)
{
struct rb_node *next;
struct snd_soc_rbtree_ctx *rbtree_ctx;
struct snd_soc_rbtree_node *rbtree_node;
/* if we've already been called then just return */
rbtree_ctx = codec->reg_cache;
if (!rbtree_ctx)
return 0;
/* free up the rbtree */
next = rb_first(&rbtree_ctx->root);
while (next) {
rbtree_node = rb_entry(next, struct snd_soc_rbtree_node, node);
next = rb_next(&rbtree_node->node);
rb_erase(&rbtree_node->node, &rbtree_ctx->root);
kfree(rbtree_node->block);
kfree(rbtree_node);
}
/* release the resources */
kfree(codec->reg_cache);
codec->reg_cache = NULL;
return 0;
}
static int snd_soc_rbtree_cache_init(struct snd_soc_codec *codec)
{
struct snd_soc_rbtree_ctx *rbtree_ctx;
unsigned int word_size;
unsigned int val;
int i;
int ret;
codec->reg_cache = kmalloc(sizeof *rbtree_ctx, GFP_KERNEL);
if (!codec->reg_cache)
return -ENOMEM;
rbtree_ctx = codec->reg_cache;
rbtree_ctx->root = RB_ROOT;
rbtree_ctx->cached_rbnode = NULL;
if (!codec->reg_def_copy)
return 0;
word_size = codec->driver->reg_word_size;
for (i = 0; i < codec->driver->reg_cache_size; ++i) {
val = snd_soc_get_cache_val(codec->reg_def_copy, i,
word_size);
if (!val)
continue;
ret = snd_soc_rbtree_cache_write(codec, i, val);
if (ret)
goto err;
}
return 0;
err:
snd_soc_cache_exit(codec);
return ret;
}
static int snd_soc_flat_cache_sync(struct snd_soc_codec *codec)
{
int i;
int ret;
const struct snd_soc_codec_driver *codec_drv;
unsigned int val;
codec_drv = codec->driver;
for (i = 0; i < codec_drv->reg_cache_size; ++i) {
ret = snd_soc_cache_read(codec, i, &val);
if (ret)
return ret;
if (codec->reg_def_copy)
if (snd_soc_get_cache_val(codec->reg_def_copy,
i, codec_drv->reg_word_size) == val)
continue;
WARN_ON(!snd_soc_codec_writable_register(codec, i));
ret = snd_soc_write(codec, i, val);
if (ret)
return ret;
dev_dbg(codec->dev, "Synced register %#x, value = %#x\n",
i, val);
}
return 0;
}
static int snd_soc_flat_cache_write(struct snd_soc_codec *codec,
unsigned int reg, unsigned int value)
{
snd_soc_set_cache_val(codec->reg_cache, reg, value,
codec->driver->reg_word_size);
return 0;
}
static int snd_soc_flat_cache_read(struct snd_soc_codec *codec,
unsigned int reg, unsigned int *value)
{
*value = snd_soc_get_cache_val(codec->reg_cache, reg,
codec->driver->reg_word_size);
return 0;
}
static int snd_soc_flat_cache_exit(struct snd_soc_codec *codec)
{
if (!codec->reg_cache)
return 0;
kfree(codec->reg_cache);
codec->reg_cache = NULL;
return 0;
}
static int snd_soc_flat_cache_init(struct snd_soc_codec *codec)
{
if (codec->reg_def_copy)
codec->reg_cache = kmemdup(codec->reg_def_copy,
codec->reg_size, GFP_KERNEL);
else
codec->reg_cache = kzalloc(codec->reg_size, GFP_KERNEL);
if (!codec->reg_cache)
return -ENOMEM;
return 0;
}
/* an array of all supported compression types */
static const struct snd_soc_cache_ops cache_types[] = {
/* Flat *must* be the first entry for fallback */
{
.id = SND_SOC_FLAT_COMPRESSION,
.name = "flat",
.init = snd_soc_flat_cache_init,
.exit = snd_soc_flat_cache_exit,
.read = snd_soc_flat_cache_read,
.write = snd_soc_flat_cache_write,
.sync = snd_soc_flat_cache_sync
},
{
.id = SND_SOC_RBTREE_COMPRESSION,
.name = "rbtree",
.init = snd_soc_rbtree_cache_init,
.exit = snd_soc_rbtree_cache_exit,
.read = snd_soc_rbtree_cache_read,
.write = snd_soc_rbtree_cache_write,
.sync = snd_soc_rbtree_cache_sync
}
};
int snd_soc_cache_init(struct snd_soc_codec *codec)
{
int i;
for (i = 0; i < ARRAY_SIZE(cache_types); ++i)
if (cache_types[i].id == codec->compress_type)
break;
/* Fall back to flat compression */
if (i == ARRAY_SIZE(cache_types)) {
dev_warn(codec->dev, "Could not match compress type: %d\n",
codec->compress_type);
i = 0;
}
mutex_init(&codec->cache_rw_mutex);
codec->cache_ops = &cache_types[i];
if (codec->cache_ops->init) {
if (codec->cache_ops->name)
dev_dbg(codec->dev, "Initializing %s cache for %s codec\n",
codec->cache_ops->name, codec->name);
return codec->cache_ops->init(codec);
}
return -ENOSYS;
}
/*
* NOTE: keep in mind that this function might be called
* multiple times.
*/
int snd_soc_cache_exit(struct snd_soc_codec *codec)
{
if (codec->cache_ops && codec->cache_ops->exit) {
if (codec->cache_ops->name)
dev_dbg(codec->dev, "Destroying %s cache for %s codec\n",
codec->cache_ops->name, codec->name);
return codec->cache_ops->exit(codec);
}
return -ENOSYS;
}
/**
* snd_soc_cache_read: Fetch the value of a given register from the cache.
*
* @codec: CODEC to configure.
* @reg: The register index.
* @value: The value to be returned.
*/
int snd_soc_cache_read(struct snd_soc_codec *codec,
unsigned int reg, unsigned int *value)
{
int ret;
mutex_lock(&codec->cache_rw_mutex);
if (value && codec->cache_ops && codec->cache_ops->read) {
ret = codec->cache_ops->read(codec, reg, value);
mutex_unlock(&codec->cache_rw_mutex);
return ret;
}
mutex_unlock(&codec->cache_rw_mutex);
return -ENOSYS;
}
EXPORT_SYMBOL_GPL(snd_soc_cache_read);
/**
* snd_soc_cache_write: Set the value of a given register in the cache.
*
* @codec: CODEC to configure.
* @reg: The register index.
* @value: The new register value.
*/
int snd_soc_cache_write(struct snd_soc_codec *codec,
unsigned int reg, unsigned int value)
{
int ret;
mutex_lock(&codec->cache_rw_mutex);
if (codec->cache_ops && codec->cache_ops->write) {
ret = codec->cache_ops->write(codec, reg, value);
mutex_unlock(&codec->cache_rw_mutex);
return ret;
}
mutex_unlock(&codec->cache_rw_mutex);
return -ENOSYS;
}
EXPORT_SYMBOL_GPL(snd_soc_cache_write);
/**
* snd_soc_cache_sync: Sync the register cache with the hardware.
*
* @codec: CODEC to configure.
*
* Any registers that should not be synced should be marked as
* volatile. In general drivers can choose not to use the provided
* syncing functionality if they so require.
*/
int snd_soc_cache_sync(struct snd_soc_codec *codec)
{
int ret;
const char *name;
if (!codec->cache_sync) {
return 0;
}
if (!codec->cache_ops || !codec->cache_ops->sync)
return -ENOSYS;
if (codec->cache_ops->name)
name = codec->cache_ops->name;
else
name = "unknown";
if (codec->cache_ops->name)
dev_dbg(codec->dev, "Syncing %s cache for %s codec\n",
codec->cache_ops->name, codec->name);
trace_snd_soc_cache_sync(codec, name, "start");
ret = codec->cache_ops->sync(codec);
if (!ret)
codec->cache_sync = 0;
trace_snd_soc_cache_sync(codec, name, "end");
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_cache_sync);
static int snd_soc_get_reg_access_index(struct snd_soc_codec *codec,
unsigned int reg)
{
const struct snd_soc_codec_driver *codec_drv;
unsigned int min, max, index;
codec_drv = codec->driver;
min = 0;
max = codec_drv->reg_access_size - 1;
do {
index = (min + max) / 2;
if (codec_drv->reg_access_default[index].reg == reg)
return index;
if (codec_drv->reg_access_default[index].reg < reg)
min = index + 1;
else
max = index;
} while (min <= max);
return -1;
}
int snd_soc_default_volatile_register(struct snd_soc_codec *codec,
unsigned int reg)
{
int index;
if (reg >= codec->driver->reg_cache_size)
return 1;
index = snd_soc_get_reg_access_index(codec, reg);
if (index < 0)
return 0;
return codec->driver->reg_access_default[index].vol;
}
EXPORT_SYMBOL_GPL(snd_soc_default_volatile_register);
int snd_soc_default_readable_register(struct snd_soc_codec *codec,
unsigned int reg)
{
int index;
if (reg >= codec->driver->reg_cache_size)
return 1;
index = snd_soc_get_reg_access_index(codec, reg);
if (index < 0)
return 0;
return codec->driver->reg_access_default[index].read;
}
EXPORT_SYMBOL_GPL(snd_soc_default_readable_register);
int snd_soc_default_writable_register(struct snd_soc_codec *codec,
unsigned int reg)
{
int index;
if (reg >= codec->driver->reg_cache_size)
return 1;
index = snd_soc_get_reg_access_index(codec, reg);
if (index < 0)
return 0;
return codec->driver->reg_access_default[index].write;
}
EXPORT_SYMBOL_GPL(snd_soc_default_writable_register);