-static void serial_omap_rxdma_poll(unsigned long uart_no)
-{
- struct uart_omap_port *up = ui[uart_no];
- unsigned int curr_dma_pos, curr_transmitted_size;
- int ret = 0;
-
- curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel);
- if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) ||
- (curr_dma_pos == 0)) {
- if (jiffies_to_msecs(jiffies - up->port_activity) <
- up->uart_dma.rx_timeout) {
- mod_timer(&up->uart_dma.rx_timer, jiffies +
- usecs_to_jiffies(up->uart_dma.rx_poll_rate));
- } else {
- serial_omap_stop_rxdma(up);
- up->ier |= (UART_IER_RDI | UART_IER_RLSI);
- serial_out(up, UART_IER, up->ier);
- }
- return;
- }
-
- curr_transmitted_size = curr_dma_pos -
- up->uart_dma.prev_rx_dma_pos;
- up->port.icount.rx += curr_transmitted_size;
- tty_insert_flip_string(up->port.state->port.tty,
- up->uart_dma.rx_buf +
- (up->uart_dma.prev_rx_dma_pos -
- up->uart_dma.rx_buf_dma_phys),
- curr_transmitted_size);
- tty_flip_buffer_push(up->port.state->port.tty);
- up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
- if (up->uart_dma.rx_buf_size +
- up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
- ret = serial_omap_start_rxdma(up);
- if (ret < 0) {
- serial_omap_stop_rxdma(up);
- up->ier |= (UART_IER_RDI | UART_IER_RLSI);
- serial_out(up, UART_IER, up->ier);
- }
- } else {
- mod_timer(&up->uart_dma.rx_timer, jiffies +
- usecs_to_jiffies(up->uart_dma.rx_poll_rate));
- }
- up->port_activity = jiffies;
-}
-
-static void uart_rx_dma_callback(int lch, u16 ch_status, void *data)
-{
- return;
-}
-
-static int serial_omap_start_rxdma(struct uart_omap_port *up)
-{
- int ret = 0;
-
- if (up->uart_dma.rx_dma_channel == -1) {
- pm_runtime_get_sync(&up->pdev->dev);
- ret = omap_request_dma(up->uart_dma.uart_dma_rx,
- "UART Rx DMA",
- (void *)uart_rx_dma_callback, up,
- &(up->uart_dma.rx_dma_channel));
- if (ret < 0)
- return ret;
-
- omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0,
- OMAP_DMA_AMODE_CONSTANT,
- up->uart_dma.uart_base, 0, 0);
- omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0,
- OMAP_DMA_AMODE_POST_INC,
- up->uart_dma.rx_buf_dma_phys, 0, 0);
- omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel,
- OMAP_DMA_DATA_TYPE_S8,
- up->uart_dma.rx_buf_size, 1,
- OMAP_DMA_SYNC_ELEMENT,
- up->uart_dma.uart_dma_rx, 0);
- }
- up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys;
- /* FIXME: Cache maintenance needed here? */
- omap_start_dma(up->uart_dma.rx_dma_channel);
- mod_timer(&up->uart_dma.rx_timer, jiffies +
- usecs_to_jiffies(up->uart_dma.rx_poll_rate));
- up->uart_dma.rx_dma_used = true;
- return ret;
-}
-
-static void serial_omap_continue_tx(struct uart_omap_port *up)
-{
- struct circ_buf *xmit = &up->port.state->xmit;
- unsigned int start = up->uart_dma.tx_buf_dma_phys
- + (xmit->tail & (UART_XMIT_SIZE - 1));
-
- if (uart_circ_empty(xmit))
- return;
-
- up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
- /*
- * It is a circular buffer. See if the buffer has wounded back.
- * If yes it will have to be transferred in two separate dma
- * transfers
- */
- if (start + up->uart_dma.tx_buf_size >=
- up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
- up->uart_dma.tx_buf_size =
- (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start;
- omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
- OMAP_DMA_AMODE_CONSTANT,
- up->uart_dma.uart_base, 0, 0);
- omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
- OMAP_DMA_AMODE_POST_INC, start, 0, 0);
- omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
- OMAP_DMA_DATA_TYPE_S8,
- up->uart_dma.tx_buf_size, 1,
- OMAP_DMA_SYNC_ELEMENT,
- up->uart_dma.uart_dma_tx, 0);
- /* FIXME: Cache maintenance needed here? */
- omap_start_dma(up->uart_dma.tx_dma_channel);
-}
-
-static void uart_tx_dma_callback(int lch, u16 ch_status, void *data)
-{
- struct uart_omap_port *up = (struct uart_omap_port *)data;
- struct circ_buf *xmit = &up->port.state->xmit;
-
- xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \
- (UART_XMIT_SIZE - 1);
- up->port.icount.tx += up->uart_dma.tx_buf_size;
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&up->port);
-
- if (uart_circ_empty(xmit)) {
- spin_lock(&(up->uart_dma.tx_lock));
- serial_omap_stop_tx(&up->port);
- up->uart_dma.tx_dma_used = false;
- spin_unlock(&(up->uart_dma.tx_lock));
- } else {
- omap_stop_dma(up->uart_dma.tx_dma_channel);
- serial_omap_continue_tx(up);
- }
- up->port_activity = jiffies;
- return;
-}
-
-static void omap_serial_fill_features_erratas(struct uart_omap_port *up)