/**
* sw_dma_request - request a dma channel
* @name: dma channel name
* @type: channel type, normal or dedicate
*
* Returns handle to the channel if success, NULL if failed.
*/
dma_hdl_t sw_dma_request(char * name, dma_chan_type_e type)
{
u32 i, num;
u32 usign = 0;
dma_channel_t *pchan = NULL;
DMA_DBG("%s: name %s, chan type %d\n", __func__, name, (u32)type);
if((name && strlen(name) >= MAX_NAME_LEN) || (type != CHAN_NORMAL && type != CHAN_DEDICATE)) {
DMA_ERR("%s: para err, name %s, type %d\n", __func__, name, (u32)type);
return NULL;
}
mutex_lock(&dma_mutex);
/* check if already exist */
if(NULL != name && __dma_channel_already_exist(name)) {
usign = __LINE__;
goto end;
}
/* get a free channel */
if(CHAN_NORMAL == type)
i = 0;
else
i = 8;
num = i + 8;
for(; i < num ; i++) {
if(0 == g_dma_mgr.chnl[i].used) {
WARN_ON(!__chan_is_free(&g_dma_mgr.chnl[i]));
break;
}
}
if(num == i) {
usign = __LINE__;
goto end;
}
/* init channel */
pchan = &g_dma_mgr.chnl[i];
pchan->used = 1;
dma_request_init(pchan);
if(NULL != name)
strcpy(pchan->owner, name);
end:
mutex_unlock(&dma_mutex);
if(0 != usign)
DMA_ERR("%s err, line %d\n", __func__, usign);
else
DMA_DBG("%s: success, channel id %d\n", __func__, i);
return (dma_hdl_t)pchan;
}
/**
* sw_dma_getposition - get the src and dst address from the reg
* @dma_hdl: dma handle
* @psrc: pointed to src addr that will be got
* @pdst: pointed to dst addr that will be got
*
* Returns 0 if sucess, the err line number if failed.
*/
int sw_dma_getposition(dm_hdl_t dma_hdl, u32 *psrc, u32 *pdst)
{
dma_channel_t *pchan = (dma_channel_t *)dma_hdl;
if(NULL == dma_hdl || NULL == psrc || NULL == pdst) {
DMA_ERR("%s err, line %d\n", __func__, __LINE__);
return __LINE__;
}
if(0 == pchan->used) {
DMA_ERR("%s err, line %d\n", __func__, __LINE__);
return __LINE__;
}
*psrc = csp_dma_chan_get_cur_srcaddr(pchan);
*pdst = csp_dma_chan_get_cur_dstaddr(pchan);
DMA_DBG("%s: get *psrc 0x%08x, *pdst 0x%08x\n", __func__, *psrc, *pdst);
return 0;
}
/**
* sw_dma_getposition - get src and dst position
* @dma_hdl: dma handle
* @psrc: stored the src addr got
* @pdst: stored the dst addr got
*
* Returns 0 if sucess, otherwise failed
*/
int sw_dma_getposition(dma_hdl_t dma_hdl, u32 *psrc, u32 *pdst)
{
dma_channel_t *pchan = (dma_channel_t *)dma_hdl;
unsigned long flags;
u32 saddr, daddr, reamin;
BUG_ON(unlikely(!dma_handle_is_valid(dma_hdl)));
BUG_ON(unlikely(NULL == psrc || NULL == pdst));
DMA_CHAN_LOCK(&pchan->lock, flags);
/* get src/dst start addr */
saddr = csp_dma_get_saddr(pchan);
daddr = csp_dma_get_daddr(pchan);
/* get remain bytes */
reamin = csp_dma_get_bcnt(pchan);
/* note: tha caller use "period - reamin" to get transferred bytes */
*psrc = saddr - reamin;
*pdst = daddr - reamin;
DMA_CHAN_UNLOCK(&pchan->lock, flags);
DMA_DBG("%s: get *psrc 0x%08x, *pdst 0x%08x\n", __func__, *psrc, *pdst);
return 0;
}
/**
* sw_dma_request - request a dma channel
* @name: dma channel name
*
* Returns handle to the channel if success, NULL if failed.
*/
dm_hdl_t sw_dma_request(char *name, enum dma_work_mode_e work_mode)
{
u32 i = 0;
u32 usign = 0;
dma_channel_t *pchan = NULL;
DMA_DBG("%s: name %s, work_mode %d\n", __func__, name, (u32)work_mode);
if(strlen(name) >= MAX_OWNER_NAME_LEN || (work_mode != DMA_WORK_MODE_CHAIN && work_mode != DMA_WORK_MODE_SINGLE)) {
DMA_ERR("%s: para err, name %s, work mode %d\n", __func__, name, (u32)work_mode);
return NULL;
}
mutex_lock(&dma_mutex);
/* check if already exist */
if(NULL != name && __dma_channel_already_exist(name)) {
usign = __LINE__;
goto end;
}
/* get a free channel */
for(i = 0; i < DMA_CHAN_TOTAL; i++) {
pchan = &dma_chnl[i];
if(0 == pchan->used) {
#ifdef DBG_DMA
if(true != __dma_check_channel_free(pchan))
DMA_ERR("%s(%d) err, channel is not free\n", __func__, __LINE__);
#endif /* DBG_DMA */
break;
}
}
/* cannot get a free channel */
if(DMA_CHAN_TOTAL == i) {
usign = __LINE__;
goto end;
}
/* init channel */
if(DMA_WORK_MODE_CHAIN == work_mode) {
dma_request_init_chain(pchan);
} else if(DMA_WORK_MODE_SINGLE == work_mode) {
dma_request_init_single(pchan);
#ifdef NOT_ALLOC_DES_TEMP
v_addr = (u32)dma_alloc_coherent(NULL, TEMP_DES_CNT * sizeof(des_item), (dma_addr_t *)&p_addr, GFP_KERNEL);
if(0 == v_addr)
printk("%s err, dma_alloc_coherent failed, line %d\n", __func__, __LINE__);
else
printk("%s: dma_alloc_coherent return v_addr 0x%08x, p_addr 0x%08x\n", __func__, v_addr, p_addr);
index_get = 0;
index_put = 0;
#endif /* NOT_ALLOC_DES_TEMP */
}
pchan->used = 1;
if(NULL != name)
strcpy(pchan->owner, name);
pchan->work_mode = work_mode;
end:
mutex_unlock(&dma_mutex);
if(0 != usign) {
DMA_ERR("%s err, line %d\n", __func__, usign);
return (dm_hdl_t)NULL;
} else {
DMA_DBG("%s: success, channel id %d\n", __func__, i);
return (dm_hdl_t)pchan;
}
}
/**
* __dma_dump_config_para - dump dma_config_t struct
* @para: dma_config_t struct to dump
*/
static void __dma_dump_config_para(struct dma_config_t *para)
{
if(NULL == para) {
DMA_ERR("%s err, line %d\n", __func__, __LINE__);
return;
}
DMA_DBG("+++++++++++%s+++++++++++\n", __func__);
DMA_DBG(" xfer_type: %d\n", para->xfer_type);
DMA_DBG(" address_type: %d\n", para->address_type);
DMA_DBG(" para: 0x%08x\n", para->para);
DMA_DBG(" irq_spt: %d\n", para->irq_spt);
DMA_DBG(" src_addr: 0x%08x\n", para->src_addr);
DMA_DBG(" dst_addr: 0x%08x\n", para->dst_addr);
DMA_DBG(" byte_cnt: 0x%08x\n", para->byte_cnt);
DMA_DBG(" bconti_mode: %d\n", para->bconti_mode);
DMA_DBG(" src_drq_type: %d\n", para->src_drq_type);
DMA_DBG(" dst_drq_type: %d\n", para->dst_drq_type);
DMA_DBG("-----------%s-----------\n", __func__);
}