On 27-04-19, 11:36, Long Cheng wrote: > Modify uart rx and complete for DMA. > > Signed-off-by: Long Cheng <[email protected]> > --- > drivers/tty/serial/8250/8250_mtk.c | 53 > ++++++++++++++++-------------------- > 1 file changed, 23 insertions(+), 30 deletions(-) > > diff --git a/drivers/tty/serial/8250/8250_mtk.c > b/drivers/tty/serial/8250/8250_mtk.c > index c1fdbc0..04081a6 100644 > --- a/drivers/tty/serial/8250/8250_mtk.c > +++ b/drivers/tty/serial/8250/8250_mtk.c > @@ -30,7 +30,6 @@ > #define MTK_UART_DMA_EN_TX 0x2 > #define MTK_UART_DMA_EN_RX 0x5 > > -#define MTK_UART_TX_SIZE UART_XMIT_SIZE > #define MTK_UART_RX_SIZE 0x8000 > #define MTK_UART_TX_TRIGGER 1 > #define MTK_UART_RX_TRIGGER MTK_UART_RX_SIZE > @@ -64,28 +63,30 @@ static void mtk8250_dma_rx_complete(void *param) > struct mtk8250_data *data = up->port.private_data; > struct tty_port *tty_port = &up->port.state->port; > struct dma_tx_state state; > + int copied, cnt, tmp; > unsigned char *ptr; > - int copied; > > - dma_sync_single_for_cpu(dma->rxchan->device->dev, dma->rx_addr, > - dma->rx_size, DMA_FROM_DEVICE); > + if (data->rx_status == DMA_RX_SHUTDOWN) > + return; > > dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); > + cnt = dma->rx_size - state.residue; > + tmp = cnt; > > - if (data->rx_status == DMA_RX_SHUTDOWN) > - return; > + if ((data->rx_pos + cnt) > dma->rx_size) > + tmp = dma->rx_size - data->rx_pos; > > - if ((data->rx_pos + state.residue) <= dma->rx_size) { > - ptr = (unsigned char *)(data->rx_pos + dma->rx_buf); > - copied = tty_insert_flip_string(tty_port, ptr, state.residue); > - } else { > - ptr = (unsigned char *)(data->rx_pos + dma->rx_buf); > - copied = tty_insert_flip_string(tty_port, ptr, > - dma->rx_size - data->rx_pos); > + ptr = (unsigned char *)(data->rx_pos + dma->rx_buf); > + copied = tty_insert_flip_string(tty_port, ptr, tmp); > + data->rx_pos += tmp; > + > + if (cnt > tmp) { > ptr = (unsigned char *)(dma->rx_buf); > - copied += tty_insert_flip_string(tty_port, ptr, > - data->rx_pos + state.residue - dma->rx_size); > + tmp = cnt - tmp; > + copied += tty_insert_flip_string(tty_port, ptr, tmp); > + data->rx_pos = tmp; > } > + > up->port.icount.rx += copied; > > tty_flip_buffer_push(tty_port); > @@ -96,9 +97,7 @@ static void mtk8250_dma_rx_complete(void *param) > static void mtk8250_rx_dma(struct uart_8250_port *up) > { > struct uart_8250_dma *dma = up->dma; > - struct mtk8250_data *data = up->port.private_data; > struct dma_async_tx_descriptor *desc; > - struct dma_tx_state state; > > desc = dmaengine_prep_slave_single(dma->rxchan, dma->rx_addr, > dma->rx_size, DMA_DEV_TO_MEM, > @@ -113,12 +112,6 @@ static void mtk8250_rx_dma(struct uart_8250_port *up) > > dma->rx_cookie = dmaengine_submit(desc); > > - dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); > - data->rx_pos = state.residue; > - > - dma_sync_single_for_device(dma->rxchan->device->dev, dma->rx_addr, > - dma->rx_size, DMA_FROM_DEVICE); > - > dma_async_issue_pending(dma->rxchan); > } > > @@ -131,13 +124,13 @@ static void mtk8250_dma_enable(struct uart_8250_port > *up) > if (data->rx_status != DMA_RX_START) > return; > > - dma->rxconf.direction = DMA_DEV_TO_MEM; > - dma->rxconf.src_addr_width = dma->rx_size / 1024; > - dma->rxconf.src_addr = dma->rx_addr; > + dma->rxconf.direction = DMA_DEV_TO_MEM;
Direction field is deprecated, please do not use this anymore... > + dma->rxconf.src_port_window_size = dma->rx_size; > + dma->rxconf.src_addr = dma->rx_addr; > > - dma->txconf.direction = DMA_MEM_TO_DEV; > - dma->txconf.dst_addr_width = MTK_UART_TX_SIZE / 1024; > - dma->txconf.dst_addr = dma->tx_addr; > + dma->txconf.direction = DMA_MEM_TO_DEV; > + dma->txconf.dst_port_window_size = UART_XMIT_SIZE; > + dma->txconf.dst_addr = dma->tx_addr; > > serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | > UART_FCR_CLEAR_XMIT); > @@ -217,7 +210,7 @@ static void mtk8250_shutdown(struct uart_port *port) > * Mediatek UARTs use an extra highspeed register (UART_MTK_HIGHS) > * > * We need to recalcualte the quot register, as the claculation depends > - * on the vaule in the highspeed register. > + * on the value in the highspeed register. > * > * Some baudrates are not supported by the chip, so we use the next > * lower rate supported and update termios c_flag. > -- > 1.7.9.5 -- ~Vinod
