-
-
-static inline void tx_on(struct scc_priv *priv) {
- int i, n;
- unsigned long flags;
-
- if (priv->param.dma >= 0) {
- n = (priv->chip == Z85230) ? 3 : 1;
- /* Program DMA controller */
- flags = claim_dma_lock();
- set_dma_mode(priv->param.dma, DMA_MODE_WRITE);
- set_dma_addr(priv->param.dma, (int) priv->tx_buf[priv->tx_tail]+n);
- set_dma_count(priv->param.dma, priv->tx_len[priv->tx_tail]-n);
- release_dma_lock(flags);
- /* Enable TX underrun interrupt */
- write_scc(priv, R15, TxUIE);
- /* Configure DREQ */
- if (priv->type == TYPE_TWIN)
- outb((priv->param.dma == 1) ? TWIN_DMA_HDX_T1 : TWIN_DMA_HDX_T3,
- priv->card_base + TWIN_DMA_CFG);
- else
- write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN | WT_RDY_ENAB);
- /* Write first byte(s) */
- spin_lock_irqsave(priv->register_lock, flags);
- for (i = 0; i < n; i++)
- write_scc_data(priv, priv->tx_buf[priv->tx_tail][i], 1);
- enable_dma(priv->param.dma);
- spin_unlock_irqrestore(priv->register_lock, flags);
- } else {
- write_scc(priv, R15, TxUIE);
- write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN | TxINT_ENAB);
- tx_isr(priv);
- }
- /* Reset EOM latch if we do not have the AUTOEOM feature */
- if (priv->chip == Z8530) write_scc(priv, R0, RES_EOM_L);
-}
-
-
-static inline void rx_on(struct scc_priv *priv) {
- unsigned long flags;
-
- /* Clear RX FIFO */
- while (read_scc(priv, R0) & Rx_CH_AV) read_scc_data(priv);
- priv->rx_over = 0;
- if (priv->param.dma >= 0) {
- /* Program DMA controller */
- flags = claim_dma_lock();
- set_dma_mode(priv->param.dma, DMA_MODE_READ);
- set_dma_addr(priv->param.dma, (int) priv->rx_buf[priv->rx_head]);
- set_dma_count(priv->param.dma, BUF_SIZE);
- release_dma_lock(flags);
- enable_dma(priv->param.dma);
- /* Configure PackeTwin DMA */
- if (priv->type == TYPE_TWIN) {
- outb((priv->param.dma == 1) ? TWIN_DMA_HDX_R1 : TWIN_DMA_HDX_R3,
- priv->card_base + TWIN_DMA_CFG);
- }
- /* Sp. cond. intr. only, ext int enable, RX DMA enable */
- write_scc(priv, R1, EXT_INT_ENAB | INT_ERR_Rx |
- WT_RDY_RT | WT_FN_RDYFN | WT_RDY_ENAB);
- } else {
- /* Reset current frame */
- priv->rx_ptr = 0;
- /* Intr. on all Rx characters and Sp. cond., ext int enable */
- write_scc(priv, R1, EXT_INT_ENAB | INT_ALL_Rx | WT_RDY_RT |
- WT_FN_RDYFN);
- }
- write_scc(priv, R0, ERR_RES);
- write_scc(priv, R3, RxENABLE | Rx8 | RxCRC_ENAB);
-}
-
-
-static inline void rx_off(struct scc_priv *priv) {
- /* Disable receiver */
- write_scc(priv, R3, Rx8);
- /* Disable DREQ / RX interrupt */
- if (priv->param.dma >= 0 && priv->type == TYPE_TWIN)
- outb(0, priv->card_base + TWIN_DMA_CFG);
- else
- write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN);
- /* Disable DMA */
- if (priv->param.dma >= 0) disable_dma(priv->param.dma);
-}
-
-
-static void start_timer(struct scc_priv *priv, int t, int r15) {
- unsigned long flags;
-
- outb(priv->tmr_mode, priv->tmr_ctrl);
- if (t == 0) {
- tm_isr(priv);
- } else if (t > 0) {
- save_flags(flags);
- cli();
- outb(t & 0xFF, priv->tmr_cnt);
- outb((t >> 8) & 0xFF, priv->tmr_cnt);
- if (priv->type != TYPE_TWIN) {
- write_scc(priv, R15, r15 | CTSIE);
- priv->rr0 |= CTS;
- }
- restore_flags(flags);
- }
-}
-
-
-static inline unsigned char random(void) {
- /* See "Numerical Recipes in C", second edition, p. 284 */
- rand = rand * 1664525L + 1013904223L;
- return (unsigned char) (rand >> 24);
-}
-