diff options
Diffstat (limited to 'drivers/dma/dw-edma/dw-hdma-v0-core.c')
| -rw-r--r-- | drivers/dma/dw-edma/dw-hdma-v0-core.c | 63 |
1 files changed, 33 insertions, 30 deletions
diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c index 00b735a0202a..e3f8db4fe909 100644 --- a/drivers/dma/dw-edma/dw-hdma-v0-core.c +++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c @@ -17,8 +17,8 @@ enum dw_hdma_control { DW_HDMA_V0_CB = BIT(0), DW_HDMA_V0_TCB = BIT(1), DW_HDMA_V0_LLP = BIT(2), - DW_HDMA_V0_LIE = BIT(3), - DW_HDMA_V0_RIE = BIT(4), + DW_HDMA_V0_LWIE = BIT(3), + DW_HDMA_V0_RWIE = BIT(4), DW_HDMA_V0_CCS = BIT(8), DW_HDMA_V0_LLE = BIT(9), }; @@ -65,18 +65,12 @@ static void dw_hdma_v0_core_off(struct dw_edma *dw) static u16 dw_hdma_v0_core_ch_count(struct dw_edma *dw, enum dw_edma_dir dir) { - u32 num_ch = 0; - int id; - - for (id = 0; id < HDMA_V0_MAX_NR_CH; id++) { - if (GET_CH_32(dw, id, dir, ch_en) & BIT(0)) - num_ch++; - } - - if (num_ch > HDMA_V0_MAX_NR_CH) - num_ch = HDMA_V0_MAX_NR_CH; - - return (u16)num_ch; + /* + * The HDMA IP have no way to know the number of hardware channels + * available, we set it to maximum channels and let the platform + * set the right number of channels. + */ + return HDMA_V0_MAX_NR_CH; } static enum dma_status dw_hdma_v0_core_ch_status(struct dw_edma_chan *chan) @@ -201,25 +195,14 @@ static void dw_hdma_v0_write_ll_link(struct dw_edma_chunk *chunk, static void dw_hdma_v0_core_write_chunk(struct dw_edma_chunk *chunk) { struct dw_edma_burst *child; - struct dw_edma_chan *chan = chunk->chan; u32 control = 0, i = 0; - int j; if (chunk->cb) control = DW_HDMA_V0_CB; - j = chunk->bursts_alloc; - list_for_each_entry(child, &chunk->burst->list, list) { - j--; - if (!j) { - control |= DW_HDMA_V0_LIE; - if (!(chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL)) - control |= DW_HDMA_V0_RIE; - } - + list_for_each_entry(child, &chunk->burst->list, list) dw_hdma_v0_write_ll_data(chunk, i++, control, child->sz, child->sar, child->dar); - } control = DW_HDMA_V0_LLP | DW_HDMA_V0_TCB; if (!chunk->cb) @@ -228,6 +211,20 @@ static void dw_hdma_v0_core_write_chunk(struct dw_edma_chunk *chunk) dw_hdma_v0_write_ll_link(chunk, i, control, chunk->ll_region.paddr); } +static void dw_hdma_v0_sync_ll_data(struct dw_edma_chunk *chunk) +{ + /* + * In case of remote HDMA engine setup, the DW PCIe RP/EP internal + * configuration registers and application memory are normally accessed + * over different buses. Ensure LL-data reaches the memory before the + * doorbell register is toggled by issuing the dummy-read from the remote + * LL memory in a hope that the MRd TLP will return only after the + * last MWr TLP is completed + */ + if (!(chunk->chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL)) + readl(chunk->ll_region.vaddr.io); +} + static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first) { struct dw_edma_chan *chan = chunk->chan; @@ -239,10 +236,13 @@ static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first) if (first) { /* Enable engine */ SET_CH_32(dw, chan->dir, chan->id, ch_en, BIT(0)); - /* Interrupt enable&unmask - done, abort */ - tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup) | - HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK | - HDMA_V0_LOCAL_STOP_INT_EN | HDMA_V0_LOCAL_STOP_INT_EN; + /* Interrupt unmask - stop, abort */ + tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup); + tmp &= ~(HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK); + /* Interrupt enable - stop, abort */ + tmp |= HDMA_V0_LOCAL_STOP_INT_EN | HDMA_V0_LOCAL_ABORT_INT_EN; + if (!(dw->chip->flags & DW_EDMA_CHIP_LOCAL)) + tmp |= HDMA_V0_REMOTE_STOP_INT_EN | HDMA_V0_REMOTE_ABORT_INT_EN; SET_CH_32(dw, chan->dir, chan->id, int_setup, tmp); /* Channel control */ SET_CH_32(dw, chan->dir, chan->id, control1, HDMA_V0_LINKLIST_EN); @@ -256,6 +256,9 @@ static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first) /* Set consumer cycle */ SET_CH_32(dw, chan->dir, chan->id, cycle_sync, HDMA_V0_CONSUMER_CYCLE_STAT | HDMA_V0_CONSUMER_CYCLE_BIT); + + dw_hdma_v0_sync_ll_data(chunk); + /* Doorbell */ SET_CH_32(dw, chan->dir, chan->id, doorbell, HDMA_V0_DOORBELL_START); } |