diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-topcliff-pch.c | 66 |
1 files changed, 55 insertions, 11 deletions
diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c index 3238ec8..1e60827 100644 --- a/drivers/spi/spi-topcliff-pch.c +++ b/drivers/spi/spi-topcliff-pch.c @@ -196,6 +196,7 @@ struct pch_spi_data { struct pch_spi_dma_ctrl dma; int use_dma; u8 irq_reg_sts; + int save_total_len; }; /** @@ -823,11 +824,13 @@ static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw) rx_dma_buf = data->dma.rx_buf_virt; for (j = 0; j < data->bpw_len; j++) *rx_buf++ = *rx_dma_buf++ & 0xFF; + data->cur_trans->rx_buf = rx_buf; } else { rx_sbuf = data->cur_trans->rx_buf; rx_dma_sbuf = data->dma.rx_buf_virt; for (j = 0; j < data->bpw_len; j++) *rx_sbuf++ = *rx_dma_sbuf++; + data->cur_trans->rx_buf = rx_sbuf; } } @@ -853,6 +856,9 @@ static int pch_spi_start_transfer(struct pch_spi_data *data) rtn = wait_event_interruptible_timeout(data->wait, data->transfer_complete, msecs_to_jiffies(2 * HZ)); + if (!rtn) + dev_err(&data->master->dev, + "%s wait-event timeout\n", __func__); dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent, DMA_FROM_DEVICE); @@ -989,6 +995,7 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) int i; int size; int rem; + int head; unsigned long flags; struct pch_spi_dma_ctrl *dma; @@ -1017,6 +1024,11 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) } data->bpw_len = data->cur_trans->len / (*bpw / 8); + if (data->bpw_len > PCH_BUF_SIZE) { + data->bpw_len = PCH_BUF_SIZE; + data->cur_trans->len -= PCH_BUF_SIZE; + } + /* copy Tx Data */ if (data->cur_trans->tx_buf != NULL) { if (*bpw == 8) { @@ -1031,10 +1043,17 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) *tx_dma_sbuf++ = *tx_sbuf++; } } + + /* Calculate Rx parameter for DMA transmitting */ if (data->bpw_len > PCH_DMA_TRANS_SIZE) { - num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; + if (data->bpw_len % PCH_DMA_TRANS_SIZE) { + num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; + rem = data->bpw_len % PCH_DMA_TRANS_SIZE; + } else { + num = data->bpw_len / PCH_DMA_TRANS_SIZE; + rem = PCH_DMA_TRANS_SIZE; + } size = PCH_DMA_TRANS_SIZE; - rem = data->bpw_len % PCH_DMA_TRANS_SIZE; } else { num = 1; size = data->bpw_len; @@ -1094,15 +1113,23 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) dma->nent = num; dma->desc_rx = desc_rx; - /* TX */ - if (data->bpw_len > PCH_DMA_TRANS_SIZE) { - num = data->bpw_len / PCH_DMA_TRANS_SIZE; + /* Calculate Tx parameter for DMA transmitting */ + if (data->bpw_len > PCH_MAX_FIFO_DEPTH) { + head = PCH_MAX_FIFO_DEPTH - PCH_DMA_TRANS_SIZE; + if (data->bpw_len % PCH_DMA_TRANS_SIZE > 4) { + num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; + rem = data->bpw_len % PCH_DMA_TRANS_SIZE - head; + } else { + num = data->bpw_len / PCH_DMA_TRANS_SIZE; + rem = data->bpw_len % PCH_DMA_TRANS_SIZE + + PCH_DMA_TRANS_SIZE - head; + } size = PCH_DMA_TRANS_SIZE; - rem = 16; } else { num = 1; size = data->bpw_len; rem = data->bpw_len; + head = 0; } dma->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC); @@ -1112,11 +1139,17 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) for (i = 0; i < num; i++, sg++) { if (i == 0) { sg->offset = 0; + sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head, + sg->offset); + sg_dma_len(sg) = size + head; + } else if (i == (num - 1)) { + sg->offset = head + size * i; + sg->offset = sg->offset * (*bpw / 8); sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem, sg->offset); sg_dma_len(sg) = rem; } else { - sg->offset = rem + size * (i - 1); + sg->offset = head + size * i; sg->offset = sg->offset * (*bpw / 8); sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size, sg->offset); @@ -1204,6 +1237,7 @@ static void pch_spi_process_messages(struct work_struct *pwork) data->current_msg->spi->bits_per_word); pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL); do { + int cnt; /* If we are already processing a message get the next transfer structure from the message otherwise retrieve the 1st transfer request from the message. */ @@ -1223,11 +1257,20 @@ static void pch_spi_process_messages(struct work_struct *pwork) } spin_unlock(&data->lock); + if (!data->cur_trans->len) + goto out; + cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1; + data->save_total_len = data->cur_trans->len; if (data->use_dma) { - pch_spi_handle_dma(data, &bpw); - if (!pch_spi_start_transfer(data)) - goto out; - pch_spi_copy_rx_data_for_dma(data, bpw); + int i; + char *save_rx_buf = data->cur_trans->rx_buf; + for (i = 0; i < cnt; i ++) { + pch_spi_handle_dma(data, &bpw); + if (!pch_spi_start_transfer(data)) + goto out; + pch_spi_copy_rx_data_for_dma(data, bpw); + } + data->cur_trans->rx_buf = save_rx_buf; } else { pch_spi_set_tx(data, &bpw); pch_spi_set_ir(data); @@ -1238,6 +1281,7 @@ static void pch_spi_process_messages(struct work_struct *pwork) data->pkt_tx_buff = NULL; } /* increment message count */ + data->cur_trans->len = data->save_total_len; data->current_msg->actual_length += data->cur_trans->len; dev_dbg(&data->master->dev, |