diff options
Diffstat (limited to 'drivers/dma/coh901318.c')
| -rw-r--r-- | drivers/dma/coh901318.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c index a724e6b..557e227 100644 --- a/drivers/dma/coh901318.c +++ b/drivers/dma/coh901318.c @@ -72,6 +72,9 @@ struct coh901318_chan { unsigned long nbr_active_done; unsigned long busy; + u32 runtime_addr; + u32 runtime_ctrl; + struct coh901318_base *base; }; @@ -190,6 +193,9 @@ static inline struct coh901318_chan *to_coh901318_chan(struct dma_chan *chan) static inline dma_addr_t cohc_dev_addr(struct coh901318_chan *cohc) { + /* Runtime supplied address will take precedence */ + if (cohc->runtime_addr) + return cohc->runtime_addr; return cohc->base->platform->chan_conf[cohc->id].dev_addr; } @@ -1055,6 +1061,14 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, params = cohc_chan_param(cohc); config = params->config; + /* + * Add runtime-specific control on top, make + * sure the bits you set per peripheral channel are + * cleared in the default config from the platform. + */ + ctrl_chained |= cohc->runtime_ctrl; + ctrl_last |= cohc->runtime_ctrl; + ctrl |= cohc->runtime_ctrl; if (direction == DMA_TO_DEVICE) { u32 tx_flags = COH901318_CX_CTRL_PRDD_SOURCE | @@ -1113,6 +1127,12 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, if (ret) goto err_lli_fill; + /* + * Set the default ctrl for the channel to the one from the lli, + * things may have changed due to odd buffer alignment etc. + */ + coh901318_set_ctrl(cohc, lli->control); + COH_DBG(coh901318_list_print(cohc, lli)); /* Pick a descriptor to handle this transfer */ @@ -1175,6 +1195,146 @@ coh901318_issue_pending(struct dma_chan *chan) spin_unlock_irqrestore(&cohc->lock, flags); } +/* + * Here we wrap in the runtime dma control interface + */ +struct burst_table { + int burst_8bit; + int burst_16bit; + int burst_32bit; + u32 reg; +}; + +static const struct burst_table burst_sizes[] = { + { + .burst_8bit = 64, + .burst_16bit = 32, + .burst_32bit = 16, + .reg = COH901318_CX_CTRL_BURST_COUNT_64_BYTES, + }, + { + .burst_8bit = 48, + .burst_16bit = 24, + .burst_32bit = 12, + .reg = COH901318_CX_CTRL_BURST_COUNT_48_BYTES, + }, + { + .burst_8bit = 32, + .burst_16bit = 16, + .burst_32bit = 8, + .reg = COH901318_CX_CTRL_BURST_COUNT_32_BYTES, + }, + { + .burst_8bit = 16, + .burst_16bit = 8, + .burst_32bit = 4, + .reg = COH901318_CX_CTRL_BURST_COUNT_16_BYTES, + }, + { + .burst_8bit = 8, + .burst_16bit = 4, + .burst_32bit = 2, + .reg = COH901318_CX_CTRL_BURST_COUNT_8_BYTES, + }, + { + .burst_8bit = 4, + .burst_16bit = 2, + .burst_32bit = 1, + .reg = COH901318_CX_CTRL_BURST_COUNT_4_BYTES, + }, + { + .burst_8bit = 2, + .burst_16bit = 1, + .burst_32bit = 0, + .reg = COH901318_CX_CTRL_BURST_COUNT_2_BYTES, + }, + { + .burst_8bit = 1, + .burst_16bit = 0, + .burst_32bit = 0, + .reg = COH901318_CX_CTRL_BURST_COUNT_1_BYTE, + }, +}; + +static void coh901318_dma_set_runtimeconfig(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + dma_addr_t addr; + enum dma_slave_buswidth addr_width; + u32 maxburst; + u32 runtime_ctrl = 0; + int i = 0; + + /* We only support mem to per or per to mem transfers */ + if (config->direction == DMA_FROM_DEVICE) { + addr = config->src_addr; + addr_width = config->src_addr_width; + maxburst = config->src_maxburst; + } else if (config->direction == DMA_TO_DEVICE) { + addr = config->dst_addr; + addr_width = config->dst_addr_width; + maxburst = config->dst_maxburst; + } else { + dev_err(COHC_2_DEV(cohc), "illegal channel mode\n"); + return; + } + + dev_dbg(COHC_2_DEV(cohc), "configure channel for %d byte transfers\n", + addr_width); + switch (addr_width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + runtime_ctrl |= + COH901318_CX_CTRL_SRC_BUS_SIZE_8_BITS | + COH901318_CX_CTRL_DST_BUS_SIZE_8_BITS; + + while (i < ARRAY_SIZE(burst_sizes)) { + if (burst_sizes[i].burst_8bit <= maxburst) + break; + i++; + } + + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + runtime_ctrl |= + COH901318_CX_CTRL_SRC_BUS_SIZE_16_BITS | + COH901318_CX_CTRL_DST_BUS_SIZE_16_BITS; + + while (i < ARRAY_SIZE(burst_sizes)) { + if (burst_sizes[i].burst_16bit <= maxburst) + break; + i++; + } + + break; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + /* Direction doesn't matter here, it's 32/32 bits */ + runtime_ctrl |= + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS; + + while (i < ARRAY_SIZE(burst_sizes)) { + if (burst_sizes[i].burst_32bit <= maxburst) + break; + i++; + } + + break; + default: + dev_err(COHC_2_DEV(cohc), + "bad runtimeconfig: alien address width\n"); + return; + } + + runtime_ctrl |= burst_sizes[i].reg; + dev_dbg(COHC_2_DEV(cohc), + "selected burst size %d bytes for address width %d bytes, maxburst %d\n", + burst_sizes[i].burst_8bit, addr_width, maxburst); + + cohc->runtime_addr = addr; + cohc->runtime_ctrl = runtime_ctrl; +} + static int coh901318_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg) @@ -1184,6 +1344,14 @@ coh901318_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, struct coh901318_desc *cohd; void __iomem *virtbase = cohc->base->virtbase; + if (cmd == DMA_SLAVE_CONFIG) { + struct dma_slave_config *config = + (struct dma_slave_config *) arg; + + coh901318_dma_set_runtimeconfig(chan, config); + return 0; + } + if (cmd == DMA_PAUSE) { coh901318_pause(chan); return 0; @@ -1240,6 +1408,7 @@ coh901318_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, return 0; } + void coh901318_base_init(struct dma_device *dma, const int *pick_chans, struct coh901318_base *base) { |