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/**
* Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
*
* This source file is released under GPL v2 license (no other versions).
* See the COPYING file included in the main directory of this source
* distribution for the license terms and conditions.
*
* @File ctresource.c
*
* @Brief
* This file contains the implementation of some generic helper functions.
*
* @Author Liu Chun
* @Date May 15 2008
*
*/
#include "ctresource.h"
#include "cthardware.h"
#include <linux/err.h>
#include <linux/slab.h>
#define AUDIO_SLOT_BLOCK_NUM 256
/* Resource allocation based on bit-map management mechanism */
static int
get_resource(u8 *rscs, unsigned int amount,
unsigned int multi, unsigned int *ridx)
{
int i, j, k, n;
/* Check whether there are sufficient resources to meet request. */
for (i = 0, n = multi; i < amount; i++) {
j = i / 8;
k = i % 8;
if (rscs[j] & ((u8)1 << k)) {
n = multi;
continue;
}
if (!(--n))
break; /* found sufficient contiguous resources */
}
if (i >= amount) {
/* Can not find sufficient contiguous resources */
return -ENOENT;
}
/* Mark the contiguous bits in resource bit-map as used */
for (n = multi; n > 0; n--) {
j = i / 8;
k = i % 8;
rscs[j] |= ((u8)1 << k);
i--;
}
*ridx = i + 1;
return 0;
}
static int put_resource(u8 *rscs, unsigned int multi, unsigned int idx)
{
unsigned int i, j, k, n;
/* Mark the contiguous bits in resource bit-map as used */
for (n = multi, i = idx; n > 0; n--) {
j = i / 8;
k = i % 8;
rscs[j] &= ~((u8)1 << k);
i++;
}
return 0;
}
int mgr_get_resource(struct rsc_mgr *mgr, unsigned int n, unsigned int *ridx)
{
int err;
if (n > mgr->avail)
return -ENOENT;
err = get_resource(mgr->rscs, mgr->amount, n, ridx);
if (!err)
mgr->avail -= n;
return err;
}
int mgr_put_resource(struct rsc_mgr *mgr, unsigned int n, unsigned int idx)
{
put_resource(mgr->rscs, n, idx);
mgr->avail += n;
return 0;
}
static unsigned char offset_in_audio_slot_block[NUM_RSCTYP] = {
/* SRC channel is at Audio Ring slot 1 every 16 slots. */
[SRC] = 0x1,
[AMIXER] = 0x4,
[SUM] = 0xc,
};
static int rsc_index(const struct rsc *rsc)
{
return rsc->conj;
}
static int audio_ring_slot(const struct rsc *rsc)
{
return (rsc->conj << 4) + offset_in_audio_slot_block[rsc->type];
}
static int rsc_next_conj(struct rsc *rsc)
{
unsigned int i;
for (i = 0; (i < 8) && (!(rsc->msr & (0x1 << i))); )
i++;
rsc->conj += (AUDIO_SLOT_BLOCK_NUM >> i);
return rsc->conj;
}
static int rsc_master(struct rsc *rsc)
{
return rsc->conj = rsc->idx;
}
static struct rsc_ops rsc_generic_ops = {
.index = rsc_index,
.output_slot = audio_ring_slot,
.master = rsc_master,
.next_conj = rsc_next_conj,
};
int
rsc_init(struct rsc *rsc, u32 idx, enum RSCTYP type, u32 msr, struct hw *hw)
{
int err = 0;
rsc->idx = idx;
rsc->conj = idx;
rsc->type = type;
rsc->msr = msr;
rsc->hw = hw;
rsc->ops = &rsc_generic_ops;
if (!hw) {
rsc->ctrl_blk = NULL;
return 0;
}
switch (type) {
case SRC:
err = hw->src_rsc_get_ctrl_blk(&rsc->ctrl_blk);
break;
case AMIXER:
err = hw->amixer_rsc_get_ctrl_blk(&rsc->ctrl_blk);
break;
case SRCIMP:
case SUM:
case DAIO:
break;
default:
pr_err("ctxfi: Invalid resource type value %d!\n", type);
return -EINVAL;
}
if (err) {
pr_err("ctxfi: Failed to get resource control block!\n");
return err;
}
return 0;
}
int rsc_uninit(struct rsc *rsc)
{
if ((NULL != rsc->hw) && (NULL != rsc->ctrl_blk)) {
switch (rsc->type) {
case SRC:
rsc->hw->src_rsc_put_ctrl_blk(rsc->ctrl_blk);
break;
case AMIXER:
rsc->hw->amixer_rsc_put_ctrl_blk(rsc->ctrl_blk);
break;
case SUM:
case DAIO:
break;
default:
pr_err("ctxfi: Invalid resource type value %d!\n",
rsc->type);
break;
}
rsc->hw = rsc->ctrl_blk = NULL;
}
rsc->idx = rsc->conj = 0;
rsc->type = NUM_RSCTYP;
rsc->msr = 0;
return 0;
}
int rsc_mgr_init(struct rsc_mgr *mgr, enum RSCTYP type,
unsigned int amount, struct hw *hw)
{
int err = 0;
mgr->type = NUM_RSCTYP;
mgr->rscs = kzalloc(((amount + 8 - 1) / 8), GFP_KERNEL);
if (!mgr->rscs)
return -ENOMEM;
switch (type) {
case SRC:
err = hw->src_mgr_get_ctrl_blk(&mgr->ctrl_blk);
break;
case SRCIMP:
err = hw->srcimp_mgr_get_ctrl_blk(&mgr->ctrl_blk);
break;
case AMIXER:
err = hw->amixer_mgr_get_ctrl_blk(&mgr->ctrl_blk);
break;
case DAIO:
err = hw->daio_mgr_get_ctrl_blk(hw, &mgr->ctrl_blk);
break;
case SUM:
break;
default:
pr_err("ctxfi: Invalid resource type value %d!\n", type);
err = -EINVAL;
goto error;
}
if (err) {
pr_err("ctxfi: Failed to get manager control block!\n");
goto error;
}
mgr->type = type;
mgr->avail = mgr->amount = amount;
mgr->hw = hw;
return 0;
error:
kfree(mgr->rscs);
return err;
}
int rsc_mgr_uninit(struct rsc_mgr *mgr)
{
if (NULL != mgr->rscs) {
kfree(mgr->rscs);
mgr->rscs = NULL;
}
if ((NULL != mgr->hw) && (NULL != mgr->ctrl_blk)) {
switch (mgr->type) {
case SRC:
mgr->hw->src_mgr_put_ctrl_blk(mgr->ctrl_blk);
break;
case SRCIMP:
mgr->hw->srcimp_mgr_put_ctrl_blk(mgr->ctrl_blk);
break;
case AMIXER:
mgr->hw->amixer_mgr_put_ctrl_blk(mgr->ctrl_blk);
break;
case DAIO:
mgr->hw->daio_mgr_put_ctrl_blk(mgr->ctrl_blk);
break;
case SUM:
break;
default:
pr_err("ctxfi: Invalid resource type value %d!\n",
mgr->type);
break;
}
mgr->hw = mgr->ctrl_blk = NULL;
}
mgr->type = NUM_RSCTYP;
mgr->avail = mgr->amount = 0;
return 0;
}
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