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DMAENGINE: add runtime slave config to DMA40 v3
This extends the DMA engine driver for the DMA40 used in the U8500 platform with the generic runtime slave configuration interface. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
parent
c156d0a5b0
commit
95e1400fa1
1 changed files with 137 additions and 4 deletions
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@ -208,6 +208,9 @@ struct d40_chan {
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struct d40_def_lcsp log_def;
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struct d40_lcla_elem lcla;
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struct d40_log_lli_full *lcpa;
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/* Runtime reconfiguration */
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dma_addr_t runtime_addr;
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enum dma_data_direction runtime_direction;
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};
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/**
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@ -1886,9 +1889,16 @@ static int d40_prep_slave_sg_log(struct d40_desc *d40d,
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d40d->lli_tx_len = 1;
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if (direction == DMA_FROM_DEVICE)
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dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
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if (d40c->runtime_addr)
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dev_addr = d40c->runtime_addr;
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else
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dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
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else if (direction == DMA_TO_DEVICE)
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dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
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if (d40c->runtime_addr)
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dev_addr = d40c->runtime_addr;
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else
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dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
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else
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return -EINVAL;
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@ -1931,9 +1941,15 @@ static int d40_prep_slave_sg_phy(struct d40_desc *d40d,
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if (direction == DMA_FROM_DEVICE) {
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dst_dev_addr = 0;
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src_dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
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if (d40c->runtime_addr)
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src_dev_addr = d40c->runtime_addr;
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else
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src_dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
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} else if (direction == DMA_TO_DEVICE) {
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dst_dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
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if (d40c->runtime_addr)
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dst_dev_addr = d40c->runtime_addr;
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else
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dst_dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
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src_dev_addr = 0;
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} else
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return -EINVAL;
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@ -2070,6 +2086,117 @@ static void d40_issue_pending(struct dma_chan *chan)
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spin_unlock_irqrestore(&d40c->lock, flags);
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}
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/* Runtime reconfiguration extension */
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static void d40_set_runtime_config(struct dma_chan *chan,
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struct dma_slave_config *config)
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{
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struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
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struct stedma40_chan_cfg *cfg = &d40c->dma_cfg;
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enum dma_slave_buswidth config_addr_width;
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dma_addr_t config_addr;
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u32 config_maxburst;
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enum stedma40_periph_data_width addr_width;
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int psize;
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if (config->direction == DMA_FROM_DEVICE) {
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dma_addr_t dev_addr_rx =
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d40c->base->plat_data->dev_rx[cfg->src_dev_type];
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config_addr = config->src_addr;
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if (dev_addr_rx)
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dev_dbg(d40c->base->dev,
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"channel has a pre-wired RX address %08x "
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"overriding with %08x\n",
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dev_addr_rx, config_addr);
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if (cfg->dir != STEDMA40_PERIPH_TO_MEM)
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dev_dbg(d40c->base->dev,
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"channel was not configured for peripheral "
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"to memory transfer (%d) overriding\n",
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cfg->dir);
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cfg->dir = STEDMA40_PERIPH_TO_MEM;
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config_addr_width = config->src_addr_width;
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config_maxburst = config->src_maxburst;
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} else if (config->direction == DMA_TO_DEVICE) {
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dma_addr_t dev_addr_tx =
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d40c->base->plat_data->dev_tx[cfg->dst_dev_type];
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config_addr = config->dst_addr;
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if (dev_addr_tx)
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dev_dbg(d40c->base->dev,
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"channel has a pre-wired TX address %08x "
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"overriding with %08x\n",
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dev_addr_tx, config_addr);
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if (cfg->dir != STEDMA40_MEM_TO_PERIPH)
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dev_dbg(d40c->base->dev,
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"channel was not configured for memory "
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"to peripheral transfer (%d) overriding\n",
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cfg->dir);
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cfg->dir = STEDMA40_MEM_TO_PERIPH;
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config_addr_width = config->dst_addr_width;
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config_maxburst = config->dst_maxburst;
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} else {
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dev_err(d40c->base->dev,
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"unrecognized channel direction %d\n",
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config->direction);
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return;
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}
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switch (config_addr_width) {
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case DMA_SLAVE_BUSWIDTH_1_BYTE:
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addr_width = STEDMA40_BYTE_WIDTH;
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break;
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case DMA_SLAVE_BUSWIDTH_2_BYTES:
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addr_width = STEDMA40_HALFWORD_WIDTH;
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break;
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case DMA_SLAVE_BUSWIDTH_4_BYTES:
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addr_width = STEDMA40_WORD_WIDTH;
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break;
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case DMA_SLAVE_BUSWIDTH_8_BYTES:
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addr_width = STEDMA40_DOUBLEWORD_WIDTH;
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break;
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default:
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dev_err(d40c->base->dev,
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"illegal peripheral address width "
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"requested (%d)\n",
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config->src_addr_width);
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return;
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}
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if (config_maxburst >= 16)
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psize = STEDMA40_PSIZE_LOG_16;
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else if (config_maxburst >= 8)
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psize = STEDMA40_PSIZE_LOG_8;
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else if (config_maxburst >= 4)
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psize = STEDMA40_PSIZE_LOG_4;
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else
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psize = STEDMA40_PSIZE_LOG_1;
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/* Set up all the endpoint configs */
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cfg->src_info.data_width = addr_width;
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cfg->src_info.psize = psize;
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cfg->src_info.endianess = STEDMA40_LITTLE_ENDIAN;
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cfg->src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL;
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cfg->dst_info.data_width = addr_width;
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cfg->dst_info.psize = psize;
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cfg->dst_info.endianess = STEDMA40_LITTLE_ENDIAN;
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cfg->dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL;
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/* These settings will take precedence later */
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d40c->runtime_addr = config_addr;
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d40c->runtime_direction = config->direction;
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dev_dbg(d40c->base->dev,
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"configured channel %s for %s, data width %d, "
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"maxburst %d bytes, LE, no flow control\n",
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dma_chan_name(chan),
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(config->direction == DMA_FROM_DEVICE) ? "RX" : "TX",
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config_addr_width,
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config_maxburst);
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}
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static int d40_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
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unsigned long arg)
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{
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@ -2092,6 +2219,12 @@ static int d40_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
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return d40_pause(chan);
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case DMA_RESUME:
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return d40_resume(chan);
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case DMA_SLAVE_CONFIG:
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d40_set_runtime_config(chan,
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(struct dma_slave_config *) arg);
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return 0;
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default:
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break;
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}
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/* Other commands are unimplemented */
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