722 строки
18 KiB
C
722 строки
18 KiB
C
/*
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* soc-cache.c -- ASoC register cache helpers
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*
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* Copyright 2009 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 it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/i2c.h>
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#include <linux/spi/spi.h>
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#include <sound/soc.h>
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#include <linux/bitmap.h>
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#include <linux/rbtree.h>
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#include <linux/export.h>
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#include <trace/events/asoc.h>
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static bool snd_soc_set_cache_val(void *base, unsigned int idx,
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unsigned int val, unsigned int word_size)
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{
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switch (word_size) {
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case 1: {
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u8 *cache = base;
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if (cache[idx] == val)
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return true;
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cache[idx] = val;
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break;
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}
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case 2: {
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u16 *cache = base;
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if (cache[idx] == val)
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return true;
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cache[idx] = val;
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break;
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}
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default:
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BUG();
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}
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return false;
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}
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static unsigned int snd_soc_get_cache_val(const void *base, unsigned int idx,
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unsigned int word_size)
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{
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if (!base)
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return -1;
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switch (word_size) {
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case 1: {
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const u8 *cache = base;
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return cache[idx];
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}
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case 2: {
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const u16 *cache = base;
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return cache[idx];
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}
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default:
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BUG();
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}
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/* unreachable */
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return -1;
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}
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struct snd_soc_rbtree_node {
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struct rb_node node; /* the actual rbtree node holding this block */
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unsigned int base_reg; /* base register handled by this block */
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unsigned int word_size; /* number of bytes needed to represent the register index */
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void *block; /* block of adjacent registers */
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unsigned int blklen; /* number of registers available in the block */
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} __attribute__ ((packed));
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struct snd_soc_rbtree_ctx {
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struct rb_root root;
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struct snd_soc_rbtree_node *cached_rbnode;
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};
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static inline void snd_soc_rbtree_get_base_top_reg(
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struct snd_soc_rbtree_node *rbnode,
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unsigned int *base, unsigned int *top)
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{
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*base = rbnode->base_reg;
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*top = rbnode->base_reg + rbnode->blklen - 1;
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}
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static unsigned int snd_soc_rbtree_get_register(
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struct snd_soc_rbtree_node *rbnode, unsigned int idx)
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{
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unsigned int val;
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switch (rbnode->word_size) {
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case 1: {
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u8 *p = rbnode->block;
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val = p[idx];
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return val;
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}
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case 2: {
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u16 *p = rbnode->block;
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val = p[idx];
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return val;
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}
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default:
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BUG();
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break;
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}
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return -1;
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}
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static void snd_soc_rbtree_set_register(struct snd_soc_rbtree_node *rbnode,
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unsigned int idx, unsigned int val)
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{
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switch (rbnode->word_size) {
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case 1: {
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u8 *p = rbnode->block;
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p[idx] = val;
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break;
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}
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case 2: {
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u16 *p = rbnode->block;
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p[idx] = val;
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break;
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}
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default:
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BUG();
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break;
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}
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}
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static struct snd_soc_rbtree_node *snd_soc_rbtree_lookup(
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struct rb_root *root, unsigned int reg)
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{
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struct rb_node *node;
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struct snd_soc_rbtree_node *rbnode;
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unsigned int base_reg, top_reg;
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node = root->rb_node;
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while (node) {
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rbnode = container_of(node, struct snd_soc_rbtree_node, node);
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snd_soc_rbtree_get_base_top_reg(rbnode, &base_reg, &top_reg);
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if (reg >= base_reg && reg <= top_reg)
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return rbnode;
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else if (reg > top_reg)
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node = node->rb_right;
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else if (reg < base_reg)
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node = node->rb_left;
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}
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return NULL;
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}
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static int snd_soc_rbtree_insert(struct rb_root *root,
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struct snd_soc_rbtree_node *rbnode)
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{
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struct rb_node **new, *parent;
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struct snd_soc_rbtree_node *rbnode_tmp;
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unsigned int base_reg_tmp, top_reg_tmp;
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unsigned int base_reg;
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parent = NULL;
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new = &root->rb_node;
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while (*new) {
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rbnode_tmp = container_of(*new, struct snd_soc_rbtree_node,
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node);
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/* base and top registers of the current rbnode */
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snd_soc_rbtree_get_base_top_reg(rbnode_tmp, &base_reg_tmp,
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&top_reg_tmp);
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/* base register of the rbnode to be added */
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base_reg = rbnode->base_reg;
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parent = *new;
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/* if this register has already been inserted, just return */
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if (base_reg >= base_reg_tmp &&
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base_reg <= top_reg_tmp)
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return 0;
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else if (base_reg > top_reg_tmp)
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new = &((*new)->rb_right);
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else if (base_reg < base_reg_tmp)
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new = &((*new)->rb_left);
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}
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/* insert the node into the rbtree */
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rb_link_node(&rbnode->node, parent, new);
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rb_insert_color(&rbnode->node, root);
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return 1;
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}
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static int snd_soc_rbtree_cache_sync(struct snd_soc_codec *codec)
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{
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struct snd_soc_rbtree_ctx *rbtree_ctx;
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struct rb_node *node;
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struct snd_soc_rbtree_node *rbnode;
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unsigned int regtmp;
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unsigned int val, def;
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int ret;
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int i;
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rbtree_ctx = codec->reg_cache;
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for (node = rb_first(&rbtree_ctx->root); node; node = rb_next(node)) {
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rbnode = rb_entry(node, struct snd_soc_rbtree_node, node);
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for (i = 0; i < rbnode->blklen; ++i) {
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regtmp = rbnode->base_reg + i;
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val = snd_soc_rbtree_get_register(rbnode, i);
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def = snd_soc_get_cache_val(codec->reg_def_copy, i,
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rbnode->word_size);
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if (val == def)
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continue;
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WARN_ON(!snd_soc_codec_writable_register(codec, regtmp));
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codec->cache_bypass = 1;
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ret = snd_soc_write(codec, regtmp, val);
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codec->cache_bypass = 0;
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if (ret)
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return ret;
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dev_dbg(codec->dev, "Synced register %#x, value = %#x\n",
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regtmp, val);
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}
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}
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return 0;
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}
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static int snd_soc_rbtree_insert_to_block(struct snd_soc_rbtree_node *rbnode,
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unsigned int pos, unsigned int reg,
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unsigned int value)
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{
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u8 *blk;
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blk = krealloc(rbnode->block,
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(rbnode->blklen + 1) * rbnode->word_size, GFP_KERNEL);
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if (!blk)
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return -ENOMEM;
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/* insert the register value in the correct place in the rbnode block */
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memmove(blk + (pos + 1) * rbnode->word_size,
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blk + pos * rbnode->word_size,
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(rbnode->blklen - pos) * rbnode->word_size);
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/* update the rbnode block, its size and the base register */
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rbnode->block = blk;
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rbnode->blklen++;
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if (!pos)
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rbnode->base_reg = reg;
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snd_soc_rbtree_set_register(rbnode, pos, value);
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return 0;
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}
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static int snd_soc_rbtree_cache_write(struct snd_soc_codec *codec,
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unsigned int reg, unsigned int value)
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{
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struct snd_soc_rbtree_ctx *rbtree_ctx;
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struct snd_soc_rbtree_node *rbnode, *rbnode_tmp;
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struct rb_node *node;
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unsigned int val;
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unsigned int reg_tmp;
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unsigned int base_reg, top_reg;
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unsigned int pos;
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int i;
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int ret;
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rbtree_ctx = codec->reg_cache;
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/* look up the required register in the cached rbnode */
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rbnode = rbtree_ctx->cached_rbnode;
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if (rbnode) {
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snd_soc_rbtree_get_base_top_reg(rbnode, &base_reg, &top_reg);
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if (reg >= base_reg && reg <= top_reg) {
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reg_tmp = reg - base_reg;
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val = snd_soc_rbtree_get_register(rbnode, reg_tmp);
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if (val == value)
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return 0;
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snd_soc_rbtree_set_register(rbnode, reg_tmp, value);
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return 0;
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}
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}
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/* if we can't locate it in the cached rbnode we'll have
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* to traverse the rbtree looking for it.
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*/
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rbnode = snd_soc_rbtree_lookup(&rbtree_ctx->root, reg);
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if (rbnode) {
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reg_tmp = reg - rbnode->base_reg;
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val = snd_soc_rbtree_get_register(rbnode, reg_tmp);
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if (val == value)
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return 0;
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snd_soc_rbtree_set_register(rbnode, reg_tmp, value);
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rbtree_ctx->cached_rbnode = rbnode;
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} else {
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/* bail out early, no need to create the rbnode yet */
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if (!value)
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return 0;
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/* look for an adjacent register to the one we are about to add */
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for (node = rb_first(&rbtree_ctx->root); node;
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node = rb_next(node)) {
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rbnode_tmp = rb_entry(node, struct snd_soc_rbtree_node, node);
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for (i = 0; i < rbnode_tmp->blklen; ++i) {
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reg_tmp = rbnode_tmp->base_reg + i;
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if (abs(reg_tmp - reg) != 1)
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continue;
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/* decide where in the block to place our register */
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if (reg_tmp + 1 == reg)
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pos = i + 1;
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else
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pos = i;
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ret = snd_soc_rbtree_insert_to_block(rbnode_tmp, pos,
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reg, value);
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if (ret)
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return ret;
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rbtree_ctx->cached_rbnode = rbnode_tmp;
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return 0;
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}
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}
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/* we did not manage to find a place to insert it in an existing
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* block so create a new rbnode with a single register in its block.
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* This block will get populated further if any other adjacent
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* registers get modified in the future.
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*/
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rbnode = kzalloc(sizeof *rbnode, GFP_KERNEL);
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if (!rbnode)
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return -ENOMEM;
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rbnode->blklen = 1;
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rbnode->base_reg = reg;
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rbnode->word_size = codec->driver->reg_word_size;
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rbnode->block = kmalloc(rbnode->blklen * rbnode->word_size,
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GFP_KERNEL);
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if (!rbnode->block) {
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kfree(rbnode);
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return -ENOMEM;
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}
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snd_soc_rbtree_set_register(rbnode, 0, value);
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snd_soc_rbtree_insert(&rbtree_ctx->root, rbnode);
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rbtree_ctx->cached_rbnode = rbnode;
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}
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return 0;
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}
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static int snd_soc_rbtree_cache_read(struct snd_soc_codec *codec,
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unsigned int reg, unsigned int *value)
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{
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struct snd_soc_rbtree_ctx *rbtree_ctx;
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struct snd_soc_rbtree_node *rbnode;
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unsigned int base_reg, top_reg;
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unsigned int reg_tmp;
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rbtree_ctx = codec->reg_cache;
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/* look up the required register in the cached rbnode */
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rbnode = rbtree_ctx->cached_rbnode;
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if (rbnode) {
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snd_soc_rbtree_get_base_top_reg(rbnode, &base_reg, &top_reg);
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if (reg >= base_reg && reg <= top_reg) {
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reg_tmp = reg - base_reg;
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*value = snd_soc_rbtree_get_register(rbnode, reg_tmp);
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return 0;
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}
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}
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/* if we can't locate it in the cached rbnode we'll have
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* to traverse the rbtree looking for it.
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*/
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rbnode = snd_soc_rbtree_lookup(&rbtree_ctx->root, reg);
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if (rbnode) {
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reg_tmp = reg - rbnode->base_reg;
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*value = snd_soc_rbtree_get_register(rbnode, reg_tmp);
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rbtree_ctx->cached_rbnode = rbnode;
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} else {
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/* uninitialized registers default to 0 */
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*value = 0;
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}
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return 0;
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}
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static int snd_soc_rbtree_cache_exit(struct snd_soc_codec *codec)
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{
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struct rb_node *next;
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struct snd_soc_rbtree_ctx *rbtree_ctx;
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struct snd_soc_rbtree_node *rbtree_node;
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/* if we've already been called then just return */
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rbtree_ctx = codec->reg_cache;
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if (!rbtree_ctx)
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return 0;
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/* free up the rbtree */
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next = rb_first(&rbtree_ctx->root);
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while (next) {
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rbtree_node = rb_entry(next, struct snd_soc_rbtree_node, node);
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next = rb_next(&rbtree_node->node);
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rb_erase(&rbtree_node->node, &rbtree_ctx->root);
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kfree(rbtree_node->block);
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kfree(rbtree_node);
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}
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/* release the resources */
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kfree(codec->reg_cache);
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codec->reg_cache = NULL;
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return 0;
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}
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static int snd_soc_rbtree_cache_init(struct snd_soc_codec *codec)
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{
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struct snd_soc_rbtree_ctx *rbtree_ctx;
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unsigned int word_size;
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unsigned int val;
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int i;
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int ret;
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codec->reg_cache = kmalloc(sizeof *rbtree_ctx, GFP_KERNEL);
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if (!codec->reg_cache)
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return -ENOMEM;
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rbtree_ctx = codec->reg_cache;
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rbtree_ctx->root = RB_ROOT;
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rbtree_ctx->cached_rbnode = NULL;
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if (!codec->reg_def_copy)
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return 0;
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word_size = codec->driver->reg_word_size;
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for (i = 0; i < codec->driver->reg_cache_size; ++i) {
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val = snd_soc_get_cache_val(codec->reg_def_copy, i,
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word_size);
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if (!val)
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continue;
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ret = snd_soc_rbtree_cache_write(codec, i, val);
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if (ret)
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goto err;
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}
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return 0;
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err:
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snd_soc_cache_exit(codec);
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return ret;
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}
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static int snd_soc_flat_cache_sync(struct snd_soc_codec *codec)
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{
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int i;
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int ret;
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const struct snd_soc_codec_driver *codec_drv;
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unsigned int val;
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codec_drv = codec->driver;
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for (i = 0; i < codec_drv->reg_cache_size; ++i) {
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ret = snd_soc_cache_read(codec, i, &val);
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if (ret)
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return ret;
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if (codec->reg_def_copy)
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if (snd_soc_get_cache_val(codec->reg_def_copy,
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i, codec_drv->reg_word_size) == val)
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continue;
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WARN_ON(!snd_soc_codec_writable_register(codec, i));
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ret = snd_soc_write(codec, i, val);
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if (ret)
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return ret;
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dev_dbg(codec->dev, "Synced register %#x, value = %#x\n",
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i, val);
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}
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return 0;
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}
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static int snd_soc_flat_cache_write(struct snd_soc_codec *codec,
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unsigned int reg, unsigned int value)
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{
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snd_soc_set_cache_val(codec->reg_cache, reg, value,
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codec->driver->reg_word_size);
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return 0;
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}
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static int snd_soc_flat_cache_read(struct snd_soc_codec *codec,
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unsigned int reg, unsigned int *value)
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{
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*value = snd_soc_get_cache_val(codec->reg_cache, reg,
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codec->driver->reg_word_size);
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return 0;
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}
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static int snd_soc_flat_cache_exit(struct snd_soc_codec *codec)
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{
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if (!codec->reg_cache)
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return 0;
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kfree(codec->reg_cache);
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codec->reg_cache = NULL;
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return 0;
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}
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static int snd_soc_flat_cache_init(struct snd_soc_codec *codec)
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{
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if (codec->reg_def_copy)
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codec->reg_cache = kmemdup(codec->reg_def_copy,
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codec->reg_size, GFP_KERNEL);
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else
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codec->reg_cache = kzalloc(codec->reg_size, GFP_KERNEL);
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if (!codec->reg_cache)
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return -ENOMEM;
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return 0;
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}
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/* an array of all supported compression types */
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static const struct snd_soc_cache_ops cache_types[] = {
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/* Flat *must* be the first entry for fallback */
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{
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.id = SND_SOC_FLAT_COMPRESSION,
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.name = "flat",
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.init = snd_soc_flat_cache_init,
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.exit = snd_soc_flat_cache_exit,
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.read = snd_soc_flat_cache_read,
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.write = snd_soc_flat_cache_write,
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.sync = snd_soc_flat_cache_sync
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},
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{
|
|
.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);
|