diff options
-rw-r--r-- | drivers/dma/stm32-mdma.c | 100 |
1 files changed, 59 insertions, 41 deletions
diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c index daa1602eb9f5..9dc450b7ace6 100644 --- a/drivers/dma/stm32-mdma.c +++ b/drivers/dma/stm32-mdma.c @@ -252,13 +252,17 @@ struct stm32_mdma_hwdesc { u32 cmdr; } __aligned(64); +struct stm32_mdma_desc_node { + struct stm32_mdma_hwdesc *hwdesc; + dma_addr_t hwdesc_phys; +}; + struct stm32_mdma_desc { struct virt_dma_desc vdesc; u32 ccr; - struct stm32_mdma_hwdesc *hwdesc; - dma_addr_t hwdesc_phys; bool cyclic; u32 count; + struct stm32_mdma_desc_node node[]; }; struct stm32_mdma_chan { @@ -344,30 +348,42 @@ static struct stm32_mdma_desc *stm32_mdma_alloc_desc( struct stm32_mdma_chan *chan, u32 count) { struct stm32_mdma_desc *desc; + int i; - desc = kzalloc(sizeof(*desc), GFP_NOWAIT); + desc = kzalloc(offsetof(typeof(*desc), node[count]), GFP_NOWAIT); if (!desc) return NULL; - desc->hwdesc = dma_pool_alloc(chan->desc_pool, GFP_NOWAIT, - &desc->hwdesc_phys); - if (!desc->hwdesc) { - dev_err(chan2dev(chan), "Failed to allocate descriptor\n"); - kfree(desc); - return NULL; + for (i = 0; i < count; i++) { + desc->node[i].hwdesc = + dma_pool_alloc(chan->desc_pool, GFP_NOWAIT, + &desc->node[i].hwdesc_phys); + if (!desc->node[i].hwdesc) + goto err; } desc->count = count; return desc; + +err: + dev_err(chan2dev(chan), "Failed to allocate descriptor\n"); + while (--i >= 0) + dma_pool_free(chan->desc_pool, desc->node[i].hwdesc, + desc->node[i].hwdesc_phys); + kfree(desc); + return NULL; } static void stm32_mdma_desc_free(struct virt_dma_desc *vdesc) { struct stm32_mdma_desc *desc = to_stm32_mdma_desc(vdesc); struct stm32_mdma_chan *chan = to_stm32_mdma_chan(vdesc->tx.chan); + int i; - dma_pool_free(chan->desc_pool, desc->hwdesc, desc->hwdesc_phys); + for (i = 0; i < desc->count; i++) + dma_pool_free(chan->desc_pool, desc->node[i].hwdesc, + desc->node[i].hwdesc_phys); kfree(desc); } @@ -410,13 +426,10 @@ static enum dma_slave_buswidth stm32_mdma_get_max_width(dma_addr_t addr, static u32 stm32_mdma_get_best_burst(u32 buf_len, u32 tlen, u32 max_burst, enum dma_slave_buswidth width) { - u32 best_burst = max_burst; - u32 burst_len = best_burst * width; + u32 best_burst; - while ((burst_len > 0) && (tlen % burst_len)) { - best_burst = best_burst >> 1; - burst_len = best_burst * width; - } + best_burst = min((u32)1 << __ffs(tlen | buf_len), + max_burst * width) / width; return (best_burst > 0) ? best_burst : 1; } @@ -669,18 +682,18 @@ static int stm32_mdma_set_xfer_param(struct stm32_mdma_chan *chan, } static void stm32_mdma_dump_hwdesc(struct stm32_mdma_chan *chan, - struct stm32_mdma_hwdesc *hwdesc) + struct stm32_mdma_desc_node *node) { - dev_dbg(chan2dev(chan), "hwdesc: 0x%p\n", hwdesc); - dev_dbg(chan2dev(chan), "CTCR: 0x%08x\n", hwdesc->ctcr); - dev_dbg(chan2dev(chan), "CBNDTR: 0x%08x\n", hwdesc->cbndtr); - dev_dbg(chan2dev(chan), "CSAR: 0x%08x\n", hwdesc->csar); - dev_dbg(chan2dev(chan), "CDAR: 0x%08x\n", hwdesc->cdar); - dev_dbg(chan2dev(chan), "CBRUR: 0x%08x\n", hwdesc->cbrur); - dev_dbg(chan2dev(chan), "CLAR: 0x%08x\n", hwdesc->clar); - dev_dbg(chan2dev(chan), "CTBR: 0x%08x\n", hwdesc->ctbr); - dev_dbg(chan2dev(chan), "CMAR: 0x%08x\n", hwdesc->cmar); - dev_dbg(chan2dev(chan), "CMDR: 0x%08x\n\n", hwdesc->cmdr); + dev_dbg(chan2dev(chan), "hwdesc: %pad\n", &node->hwdesc_phys); + dev_dbg(chan2dev(chan), "CTCR: 0x%08x\n", node->hwdesc->ctcr); + dev_dbg(chan2dev(chan), "CBNDTR: 0x%08x\n", node->hwdesc->cbndtr); + dev_dbg(chan2dev(chan), "CSAR: 0x%08x\n", node->hwdesc->csar); + dev_dbg(chan2dev(chan), "CDAR: 0x%08x\n", node->hwdesc->cdar); + dev_dbg(chan2dev(chan), "CBRUR: 0x%08x\n", node->hwdesc->cbrur); + dev_dbg(chan2dev(chan), "CLAR: 0x%08x\n", node->hwdesc->clar); + dev_dbg(chan2dev(chan), "CTBR: 0x%08x\n", node->hwdesc->ctbr); + dev_dbg(chan2dev(chan), "CMAR: 0x%08x\n", node->hwdesc->cmar); + dev_dbg(chan2dev(chan), "CMDR: 0x%08x\n\n", node->hwdesc->cmdr); } static void stm32_mdma_setup_hwdesc(struct stm32_mdma_chan *chan, @@ -694,7 +707,7 @@ static void stm32_mdma_setup_hwdesc(struct stm32_mdma_chan *chan, struct stm32_mdma_hwdesc *hwdesc; u32 next = count + 1; - hwdesc = &desc->hwdesc[count]; + hwdesc = desc->node[count].hwdesc; hwdesc->ctcr = ctcr; hwdesc->cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK | STM32_MDMA_CBNDTR_BRDUM | @@ -704,19 +717,20 @@ static void stm32_mdma_setup_hwdesc(struct stm32_mdma_chan *chan, hwdesc->csar = src_addr; hwdesc->cdar = dst_addr; hwdesc->cbrur = 0; - hwdesc->clar = desc->hwdesc_phys + next * sizeof(*hwdesc); hwdesc->ctbr = ctbr; hwdesc->cmar = config->mask_addr; hwdesc->cmdr = config->mask_data; if (is_last) { if (is_cyclic) - hwdesc->clar = desc->hwdesc_phys; + hwdesc->clar = desc->node[0].hwdesc_phys; else hwdesc->clar = 0; + } else { + hwdesc->clar = desc->node[next].hwdesc_phys; } - stm32_mdma_dump_hwdesc(chan, hwdesc); + stm32_mdma_dump_hwdesc(chan, &desc->node[count]); } static int stm32_mdma_setup_xfer(struct stm32_mdma_chan *chan, @@ -780,7 +794,7 @@ stm32_mdma_prep_slave_sg(struct dma_chan *c, struct scatterlist *sgl, { struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); struct stm32_mdma_desc *desc; - int ret; + int i, ret; /* * Once DMA is in setup cyclic mode the channel we cannot assign this @@ -806,7 +820,9 @@ stm32_mdma_prep_slave_sg(struct dma_chan *c, struct scatterlist *sgl, return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); xfer_setup_err: - dma_pool_free(chan->desc_pool, &desc->hwdesc, desc->hwdesc_phys); + for (i = 0; i < desc->count; i++) + dma_pool_free(chan->desc_pool, desc->node[i].hwdesc, + desc->node[i].hwdesc_phys); kfree(desc); return NULL; } @@ -895,7 +911,9 @@ stm32_mdma_prep_dma_cyclic(struct dma_chan *c, dma_addr_t buf_addr, return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); xfer_setup_err: - dma_pool_free(chan->desc_pool, &desc->hwdesc, desc->hwdesc_phys); + for (i = 0; i < desc->count; i++) + dma_pool_free(chan->desc_pool, desc->node[i].hwdesc, + desc->node[i].hwdesc_phys); kfree(desc); return NULL; } @@ -1009,7 +1027,7 @@ stm32_mdma_prep_dma_memcpy(struct dma_chan *c, dma_addr_t dest, dma_addr_t src, ctcr |= STM32_MDMA_CTCR_PKE; /* Prepare hardware descriptor */ - hwdesc = desc->hwdesc; + hwdesc = desc->node[0].hwdesc; hwdesc->ctcr = ctcr; hwdesc->cbndtr = cbndtr; hwdesc->csar = src; @@ -1020,7 +1038,7 @@ stm32_mdma_prep_dma_memcpy(struct dma_chan *c, dma_addr_t dest, dma_addr_t src, hwdesc->cmar = 0; hwdesc->cmdr = 0; - stm32_mdma_dump_hwdesc(chan, hwdesc); + stm32_mdma_dump_hwdesc(chan, &desc->node[0]); } else { /* Setup a LLI transfer */ ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_LINKED_LIST) | @@ -1120,7 +1138,7 @@ static void stm32_mdma_start_transfer(struct stm32_mdma_chan *chan) } chan->desc = to_stm32_mdma_desc(vdesc); - hwdesc = chan->desc->hwdesc; + hwdesc = chan->desc->node[0].hwdesc; chan->curr_hwdesc = 0; stm32_mdma_write(dmadev, STM32_MDMA_CCR(id), chan->desc->ccr); @@ -1198,7 +1216,7 @@ static int stm32_mdma_resume(struct dma_chan *c) unsigned long flags; u32 status, reg; - hwdesc = &chan->desc->hwdesc[chan->curr_hwdesc]; + hwdesc = chan->desc->node[chan->curr_hwdesc].hwdesc; spin_lock_irqsave(&chan->vchan.lock, flags); @@ -1268,13 +1286,13 @@ static size_t stm32_mdma_desc_residue(struct stm32_mdma_chan *chan, u32 curr_hwdesc) { struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); + struct stm32_mdma_hwdesc *hwdesc = desc->node[0].hwdesc; u32 cbndtr, residue, modulo, burst_size; int i; residue = 0; for (i = curr_hwdesc + 1; i < desc->count; i++) { - struct stm32_mdma_hwdesc *hwdesc = &desc->hwdesc[i]; - + hwdesc = desc->node[i].hwdesc; residue += STM32_MDMA_CBNDTR_BNDT(hwdesc->cbndtr); } cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id)); @@ -1503,7 +1521,7 @@ static struct dma_chan *stm32_mdma_of_xlate(struct of_phandle_args *dma_spec, c = dma_get_any_slave_channel(&dmadev->ddev); if (!c) { - dev_err(mdma2dev(dmadev), "No more channel avalaible\n"); + dev_err(mdma2dev(dmadev), "No more channels available\n"); return NULL; } |