diff options
Diffstat (limited to 'drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c')
| -rw-r--r-- | drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 56 |
1 files changed, 25 insertions, 31 deletions
diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c index d9e4ac3edb4e..35993ab92154 100644 --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c @@ -363,12 +363,16 @@ static void axi_chan_block_xfer_start(struct axi_dma_chan *chan, DWAXIDMAC_TT_FC_MEM_TO_PER_DST : DWAXIDMAC_TT_FC_MEM_TO_PER_DMAC) << CH_CFG_H_TT_FC_POS; + if (chan->chip->apb_regs) + reg |= (chan->id << CH_CFG_H_DST_PER_POS); break; case DMA_DEV_TO_MEM: reg |= (chan->config.device_fc ? DWAXIDMAC_TT_FC_PER_TO_MEM_SRC : DWAXIDMAC_TT_FC_PER_TO_MEM_DMAC) << CH_CFG_H_TT_FC_POS; + if (chan->chip->apb_regs) + reg |= (chan->id << CH_CFG_H_SRC_PER_POS); break; default: break; @@ -470,18 +474,13 @@ static void dma_chan_free_chan_resources(struct dma_chan *dchan) pm_runtime_put(chan->chip->dev); } -static void dw_axi_dma_set_hw_channel(struct axi_dma_chip *chip, - u32 handshake_num, bool set) +static void dw_axi_dma_set_hw_channel(struct axi_dma_chan *chan, bool set) { - unsigned long start = 0; - unsigned long reg_value; - unsigned long reg_mask; - unsigned long reg_set; - unsigned long mask; - unsigned long val; + struct axi_dma_chip *chip = chan->chip; + unsigned long reg_value, val; if (!chip->apb_regs) { - dev_dbg(chip->dev, "apb_regs not initialized\n"); + dev_err(chip->dev, "apb_regs not initialized\n"); return; } @@ -490,26 +489,22 @@ static void dw_axi_dma_set_hw_channel(struct axi_dma_chip *chip, * Lock the DMA channel by assign a handshake number to the channel. * Unlock the DMA channel by assign 0x3F to the channel. */ - if (set) { - reg_set = UNUSED_CHANNEL; - val = handshake_num; - } else { - reg_set = handshake_num; + if (set) + val = chan->hw_handshake_num; + else val = UNUSED_CHANNEL; - } reg_value = lo_hi_readq(chip->apb_regs + DMAC_APB_HW_HS_SEL_0); - for_each_set_clump8(start, reg_mask, ®_value, 64) { - if (reg_mask == reg_set) { - mask = GENMASK_ULL(start + 7, start); - reg_value &= ~mask; - reg_value |= rol64(val, start); - lo_hi_writeq(reg_value, - chip->apb_regs + DMAC_APB_HW_HS_SEL_0); - break; - } - } + /* Channel is already allocated, set handshake as per channel ID */ + /* 64 bit write should handle for 8 channels */ + + reg_value &= ~(DMA_APB_HS_SEL_MASK << + (chan->id * DMA_APB_HS_SEL_BIT_SIZE)); + reg_value |= (val << (chan->id * DMA_APB_HS_SEL_BIT_SIZE)); + lo_hi_writeq(reg_value, chip->apb_regs + DMAC_APB_HW_HS_SEL_0); + + return; } /* @@ -742,7 +737,7 @@ dw_axi_dma_chan_prep_cyclic(struct dma_chan *dchan, dma_addr_t dma_addr, llp = hw_desc->llp; } while (total_segments); - dw_axi_dma_set_hw_channel(chan->chip, chan->hw_handshake_num, true); + dw_axi_dma_set_hw_channel(chan, true); return vchan_tx_prep(&chan->vc, &desc->vd, flags); @@ -822,7 +817,7 @@ dw_axi_dma_chan_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl, llp = hw_desc->llp; } while (num_sgs); - dw_axi_dma_set_hw_channel(chan->chip, chan->hw_handshake_num, true); + dw_axi_dma_set_hw_channel(chan, true); return vchan_tx_prep(&chan->vc, &desc->vd, flags); @@ -1098,8 +1093,7 @@ static int dma_chan_terminate_all(struct dma_chan *dchan) "%s failed to stop\n", axi_chan_name(chan)); if (chan->direction != DMA_MEM_TO_MEM) - dw_axi_dma_set_hw_channel(chan->chip, - chan->hw_handshake_num, false); + dw_axi_dma_set_hw_channel(chan, false); if (chan->direction == DMA_MEM_TO_DEV) dw_axi_dma_set_byte_halfword(chan, false); @@ -1296,7 +1290,7 @@ static int parse_device_properties(struct axi_dma_chip *chip) return -EINVAL; chip->dw->hdata->restrict_axi_burst_len = true; - chip->dw->hdata->axi_rw_burst_len = tmp - 1; + chip->dw->hdata->axi_rw_burst_len = tmp; } return 0; @@ -1365,7 +1359,6 @@ static int dw_probe(struct platform_device *pdev) if (ret) return ret; - INIT_LIST_HEAD(&dw->dma.channels); for (i = 0; i < hdata->nr_channels; i++) { struct axi_dma_chan *chan = &dw->chan[i]; @@ -1386,6 +1379,7 @@ static int dw_probe(struct platform_device *pdev) /* DMA capabilities */ dw->dma.chancnt = hdata->nr_channels; + dw->dma.max_burst = hdata->axi_rw_burst_len; dw->dma.src_addr_widths = AXI_DMA_BUSWIDTHS; dw->dma.dst_addr_widths = AXI_DMA_BUSWIDTHS; dw->dma.directions = BIT(DMA_MEM_TO_MEM); |