Lines Matching +full:rs485 +full:- +full:rts +full:- +full:active +full:- +full:low
1 // SPDX-License-Identifier: GPL-2.0+
18 #include <linux/clk-provider.h>
24 #include <linux/dma-mapping.h>
46 * These two offsets are substracted from the RX FIFO size to define the RTS
47 * high and low thresholds
62 /* Use device name ttyAT, major 204 and minor 154-169. This is necessary if we
71 /* Use device name ttyS, major 4, minor 64-68. This is the usual serial port
165 bool hd_start_rx; /* can start RX during half-duplex operation */
195 { .compatible = "atmel,at91rm9200-usart-serial" },
208 return __raw_readl(port->membase + reg); in atmel_uart_readl()
213 __raw_writel(value, port->membase + reg); in atmel_uart_writel()
218 return __raw_readb(port->membase + ATMEL_US_RHR); in atmel_uart_read_char()
223 __raw_writeb(value, port->membase + ATMEL_US_THR); in atmel_uart_write_char()
228 return ((port->rs485.flags & SER_RS485_ENABLED) && in atmel_uart_is_half_duplex()
229 !(port->rs485.flags & SER_RS485_RX_DURING_TX)) || in atmel_uart_is_half_duplex()
230 (port->iso7816.flags & SER_ISO7816_ENABLED); in atmel_uart_is_half_duplex()
235 return 100 - (desired_value * 100) / actual_value; in atmel_error_rate()
243 return atmel_port->use_pdc_rx; in atmel_use_pdc_rx()
250 return atmel_port->use_pdc_tx; in atmel_use_pdc_tx()
268 return atmel_port->use_dma_tx; in atmel_use_dma_tx()
275 return atmel_port->use_dma_rx; in atmel_use_dma_rx()
282 return atmel_port->fifo_size; in atmel_use_fifo()
288 if (!atomic_read(&atmel_port->tasklet_shutdown)) in atmel_tasklet_schedule()
292 /* Enable or disable the rs485 support */
300 atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask); in atmel_config_rs485()
304 if (rs485conf->flags & SER_RS485_ENABLED) { in atmel_config_rs485()
305 dev_dbg(port->dev, "Setting UART to RS485\n"); in atmel_config_rs485()
306 if (rs485conf->flags & SER_RS485_RX_DURING_TX) in atmel_config_rs485()
307 atmel_port->tx_done_mask = ATMEL_US_TXRDY; in atmel_config_rs485()
309 atmel_port->tx_done_mask = ATMEL_US_TXEMPTY; in atmel_config_rs485()
312 rs485conf->delay_rts_after_send); in atmel_config_rs485()
316 dev_dbg(port->dev, "Setting UART to RS232\n"); in atmel_config_rs485()
318 atmel_port->tx_done_mask = ATMEL_US_ENDTX | in atmel_config_rs485()
321 atmel_port->tx_done_mask = ATMEL_US_TXRDY; in atmel_config_rs485()
326 atmel_uart_writel(port, ATMEL_US_IER, atmel_port->tx_done_mask); in atmel_config_rs485()
338 mck_rate = (u64)clk_get_rate(atmel_port->clk); in atmel_calc_cd()
339 do_div(mck_rate, iso7816conf->clk); in atmel_calc_cd()
349 if (iso7816conf->sc_fi && iso7816conf->sc_di) { in atmel_calc_fidi()
350 fidi = (u64)iso7816conf->sc_fi; in atmel_calc_fidi()
351 do_div(fidi, iso7816conf->sc_di); in atmel_calc_fidi()
367 atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask); in atmel_config_iso7816()
371 if (iso7816conf->flags & SER_ISO7816_ENABLED) { in atmel_config_iso7816()
374 if (iso7816conf->tg > 255) { in atmel_config_iso7816()
375 dev_err(port->dev, "ISO7816: Timeguard exceeding 255\n"); in atmel_config_iso7816()
377 ret = -EINVAL; in atmel_config_iso7816()
381 if ((iso7816conf->flags & SER_ISO7816_T_PARAM) in atmel_config_iso7816()
384 } else if ((iso7816conf->flags & SER_ISO7816_T_PARAM) in atmel_config_iso7816()
388 dev_err(port->dev, "ISO7816: Type not supported\n"); in atmel_config_iso7816()
390 ret = -EINVAL; in atmel_config_iso7816()
404 dev_warn(port->dev, "ISO7816 fidi = 0, Generator generates no signal\n"); in atmel_config_iso7816()
405 } else if (fidi < atmel_port->fidi_min in atmel_config_iso7816()
406 || fidi > atmel_port->fidi_max) { in atmel_config_iso7816()
407 dev_err(port->dev, "ISO7816 fidi = %u, value not supported\n", fidi); in atmel_config_iso7816()
409 ret = -EINVAL; in atmel_config_iso7816()
413 if (!(port->iso7816.flags & SER_ISO7816_ENABLED)) { in atmel_config_iso7816()
415 atmel_port->backup_mode = atmel_uart_readl(port, ATMEL_US_MR); in atmel_config_iso7816()
416 atmel_port->backup_brgr = atmel_uart_readl(port, ATMEL_US_BRGR); in atmel_config_iso7816()
419 atmel_uart_writel(port, ATMEL_US_TTGR, iso7816conf->tg); in atmel_config_iso7816()
424 atmel_port->tx_done_mask = ATMEL_US_TXEMPTY | ATMEL_US_NACK | ATMEL_US_ITERATION; in atmel_config_iso7816()
426 dev_dbg(port->dev, "Setting UART back to RS232\n"); in atmel_config_iso7816()
428 mode = atmel_port->backup_mode; in atmel_config_iso7816()
431 atmel_uart_writel(port, ATMEL_US_BRGR, atmel_port->backup_brgr); in atmel_config_iso7816()
435 atmel_port->tx_done_mask = ATMEL_US_ENDTX | in atmel_config_iso7816()
438 atmel_port->tx_done_mask = ATMEL_US_TXRDY; in atmel_config_iso7816()
441 port->iso7816 = *iso7816conf; in atmel_config_iso7816()
447 atmel_uart_writel(port, ATMEL_US_IER, atmel_port->tx_done_mask); in atmel_config_iso7816()
459 if (atmel_port->tx_stopped) in atmel_tx_empty()
476 /* override mode to RS485 if needed, otherwise keep the current mode */ in atmel_set_mctrl()
477 if (port->rs485.flags & SER_RS485_ENABLED) { in atmel_set_mctrl()
479 port->rs485.delay_rts_after_send); in atmel_set_mctrl()
484 /* set the RTS line state according to the mode */ in atmel_set_mctrl()
486 /* force RTS line to high level */ in atmel_set_mctrl()
489 /* give the control of the RTS line back to the hardware */ in atmel_set_mctrl()
492 /* force RTS line to high level */ in atmel_set_mctrl()
495 /* force RTS line to low level */ in atmel_set_mctrl()
511 mctrl_gpio_set(atmel_port->gpios, mctrl); in atmel_set_mctrl()
534 * The control signals are active low. in atmel_get_mctrl()
545 return mctrl_gpio_get(atmel_port->gpios, &ret); in atmel_get_mctrl()
569 atmel_port->tx_stopped = true; in atmel_stop_tx()
573 atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask); in atmel_stop_tx()
576 if (!atomic_read(&atmel_port->tasklet_shutdown)) in atmel_stop_tx()
599 /* re-enable PDC transmit */ in atmel_start_tx()
604 atmel_uart_writel(port, ATMEL_US_IER, atmel_port->tx_done_mask); in atmel_start_tx()
607 /* re-enable the transmitter */ in atmel_start_tx()
609 atmel_port->tx_stopped = false; in atmel_start_tx()
614 * start receiving - port is in process of being opened.
627 port->read_status_mask); in atmel_start_rx()
635 * Stop receiving - port is in process of being closed.
646 port->read_status_mask); in atmel_stop_rx()
663 if (atmel_port->ms_irq_enabled) in atmel_enable_ms()
666 atmel_port->ms_irq_enabled = true; in atmel_enable_ms()
668 if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_CTS)) in atmel_enable_ms()
671 if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_DSR)) in atmel_enable_ms()
674 if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_RI)) in atmel_enable_ms()
677 if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_DCD)) in atmel_enable_ms()
682 mctrl_gpio_enable_ms(atmel_port->gpios); in atmel_enable_ms()
696 if (!atmel_port->ms_irq_enabled) in atmel_disable_ms()
699 atmel_port->ms_irq_enabled = false; in atmel_disable_ms()
701 mctrl_gpio_disable_ms(atmel_port->gpios); in atmel_disable_ms()
703 if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_CTS)) in atmel_disable_ms()
706 if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_DSR)) in atmel_disable_ms()
709 if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_RI)) in atmel_disable_ms()
712 if (!mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_DCD)) in atmel_disable_ms()
739 struct circ_buf *ring = &atmel_port->rx_ring; in atmel_buffer_rx_char()
742 if (!CIRC_SPACE(ring->head, ring->tail, ATMEL_SERIAL_RINGSIZE)) in atmel_buffer_rx_char()
746 c = &((struct atmel_uart_char *)ring->buf)[ring->head]; in atmel_buffer_rx_char()
747 c->status = status; in atmel_buffer_rx_char()
748 c->ch = ch; in atmel_buffer_rx_char()
753 ring->head = (ring->head + 1) & (ATMEL_SERIAL_RINGSIZE - 1); in atmel_buffer_rx_char()
765 /* ignore side-effect */ in atmel_pdc_rxerr()
767 port->icount.brk++; in atmel_pdc_rxerr()
770 port->icount.parity++; in atmel_pdc_rxerr()
772 port->icount.frame++; in atmel_pdc_rxerr()
774 port->icount.overrun++; in atmel_pdc_rxerr()
795 || atmel_port->break_active)) { in atmel_rx_chars()
801 && !atmel_port->break_active) { in atmel_rx_chars()
802 atmel_port->break_active = 1; in atmel_rx_chars()
807 * This is either the end-of-break in atmel_rx_chars()
811 * RXBRK will indicate start-of-break. in atmel_rx_chars()
816 atmel_port->break_active = 0; in atmel_rx_chars()
824 atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_rx); in atmel_rx_chars()
845 atmel_port->tx_done_mask |= ATMEL_US_TXRDY; in atmel_tx_chars()
849 atmel_port->tx_done_mask); in atmel_tx_chars()
852 atmel_port->tx_done_mask &= ~ATMEL_US_TXRDY; in atmel_tx_chars()
859 struct uart_port *port = &atmel_port->uart; in atmel_complete_tx_dma()
860 struct circ_buf *xmit = &port->state->xmit; in atmel_complete_tx_dma()
861 struct dma_chan *chan = atmel_port->chan_tx; in atmel_complete_tx_dma()
868 uart_xmit_advance(port, atmel_port->tx_len); in atmel_complete_tx_dma()
870 spin_lock(&atmel_port->lock_tx); in atmel_complete_tx_dma()
871 async_tx_ack(atmel_port->desc_tx); in atmel_complete_tx_dma()
872 atmel_port->cookie_tx = -EINVAL; in atmel_complete_tx_dma()
873 atmel_port->desc_tx = NULL; in atmel_complete_tx_dma()
874 spin_unlock(&atmel_port->lock_tx); in atmel_complete_tx_dma()
881 * xmit->tail to the end of xmit->buf, now we have to transmit the in atmel_complete_tx_dma()
882 * remaining data from the beginning of xmit->buf to xmit->head. in atmel_complete_tx_dma()
885 atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx); in atmel_complete_tx_dma()
888 * DMA done, re-enable TXEMPTY and signal that we can stop in atmel_complete_tx_dma()
889 * TX and start RX for RS485 in atmel_complete_tx_dma()
891 atmel_port->hd_start_rx = true; in atmel_complete_tx_dma()
893 atmel_port->tx_done_mask); in atmel_complete_tx_dma()
902 struct dma_chan *chan = atmel_port->chan_tx; in atmel_release_tx_dma()
907 dma_unmap_sg(port->dev, &atmel_port->sg_tx, 1, in atmel_release_tx_dma()
911 atmel_port->desc_tx = NULL; in atmel_release_tx_dma()
912 atmel_port->chan_tx = NULL; in atmel_release_tx_dma()
913 atmel_port->cookie_tx = -EINVAL; in atmel_release_tx_dma()
922 struct circ_buf *xmit = &port->state->xmit; in atmel_tx_dma()
923 struct dma_chan *chan = atmel_port->chan_tx; in atmel_tx_dma()
925 struct scatterlist sgl[2], *sg, *sg_tx = &atmel_port->sg_tx; in atmel_tx_dma()
930 if (atmel_port->desc_tx != NULL) in atmel_tx_dma()
943 tx_len = CIRC_CNT_TO_END(xmit->head, in atmel_tx_dma()
944 xmit->tail, in atmel_tx_dma()
947 if (atmel_port->fifo_size) { in atmel_tx_dma()
959 phys_addr = sg_dma_address(sg_tx) + xmit->tail; in atmel_tx_dma()
976 * xmit->tail correctly in atmel_tx_dma()
978 atmel_port->tx_len = tx_len; in atmel_tx_dma()
987 dev_err(port->dev, "Failed to send via dma!\n"); in atmel_tx_dma()
991 dma_sync_sg_for_device(port->dev, sg_tx, 1, DMA_TO_DEVICE); in atmel_tx_dma()
993 atmel_port->desc_tx = desc; in atmel_tx_dma()
994 desc->callback = atmel_complete_tx_dma; in atmel_tx_dma()
995 desc->callback_param = atmel_port; in atmel_tx_dma()
996 atmel_port->cookie_tx = dmaengine_submit(desc); in atmel_tx_dma()
997 if (dma_submit_error(atmel_port->cookie_tx)) { in atmel_tx_dma()
998 dev_err(port->dev, "dma_submit_error %d\n", in atmel_tx_dma()
999 atmel_port->cookie_tx); in atmel_tx_dma()
1013 struct device *mfd_dev = port->dev->parent; in atmel_prepare_tx_dma()
1024 atmel_port->chan_tx = NULL; in atmel_prepare_tx_dma()
1027 atmel_port->chan_tx = chan; in atmel_prepare_tx_dma()
1028 dev_info(port->dev, "using %s for tx DMA transfers\n", in atmel_prepare_tx_dma()
1029 dma_chan_name(atmel_port->chan_tx)); in atmel_prepare_tx_dma()
1031 spin_lock_init(&atmel_port->lock_tx); in atmel_prepare_tx_dma()
1032 sg_init_table(&atmel_port->sg_tx, 1); in atmel_prepare_tx_dma()
1034 BUG_ON(!PAGE_ALIGNED(port->state->xmit.buf)); in atmel_prepare_tx_dma()
1035 sg_set_page(&atmel_port->sg_tx, in atmel_prepare_tx_dma()
1036 virt_to_page(port->state->xmit.buf), in atmel_prepare_tx_dma()
1038 offset_in_page(port->state->xmit.buf)); in atmel_prepare_tx_dma()
1039 nent = dma_map_sg(port->dev, in atmel_prepare_tx_dma()
1040 &atmel_port->sg_tx, in atmel_prepare_tx_dma()
1045 dev_dbg(port->dev, "need to release resource of dma\n"); in atmel_prepare_tx_dma()
1048 dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", __func__, in atmel_prepare_tx_dma()
1049 sg_dma_len(&atmel_port->sg_tx), in atmel_prepare_tx_dma()
1050 port->state->xmit.buf, in atmel_prepare_tx_dma()
1051 &sg_dma_address(&atmel_port->sg_tx)); in atmel_prepare_tx_dma()
1057 config.dst_addr_width = (atmel_port->fifo_size) ? in atmel_prepare_tx_dma()
1060 config.dst_addr = port->mapbase + ATMEL_US_THR; in atmel_prepare_tx_dma()
1063 ret = dmaengine_slave_config(atmel_port->chan_tx, in atmel_prepare_tx_dma()
1066 dev_err(port->dev, "DMA tx slave configuration failed\n"); in atmel_prepare_tx_dma()
1073 dev_err(port->dev, "TX channel not available, switch to pio\n"); in atmel_prepare_tx_dma()
1074 atmel_port->use_dma_tx = false; in atmel_prepare_tx_dma()
1075 if (atmel_port->chan_tx) in atmel_prepare_tx_dma()
1077 return -EINVAL; in atmel_prepare_tx_dma()
1085 atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_rx); in atmel_complete_rx_dma()
1091 struct dma_chan *chan = atmel_port->chan_rx; in atmel_release_rx_dma()
1096 dma_unmap_sg(port->dev, &atmel_port->sg_rx, 1, in atmel_release_rx_dma()
1100 atmel_port->desc_rx = NULL; in atmel_release_rx_dma()
1101 atmel_port->chan_rx = NULL; in atmel_release_rx_dma()
1102 atmel_port->cookie_rx = -EINVAL; in atmel_release_rx_dma()
1108 struct tty_port *tport = &port->state->port; in atmel_rx_from_dma()
1109 struct circ_buf *ring = &atmel_port->rx_ring; in atmel_rx_from_dma()
1110 struct dma_chan *chan = atmel_port->chan_rx; in atmel_rx_from_dma()
1119 atmel_port->cookie_rx, in atmel_rx_from_dma()
1123 dev_dbg(port->dev, "Get residue error, restart tasklet\n"); in atmel_rx_from_dma()
1125 atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_rx); in atmel_rx_from_dma()
1130 dma_sync_sg_for_cpu(port->dev, in atmel_rx_from_dma()
1131 &atmel_port->sg_rx, in atmel_rx_from_dma()
1136 * ring->head points to the end of data already written by the DMA. in atmel_rx_from_dma()
1137 * ring->tail points to the beginning of data to be read by the in atmel_rx_from_dma()
1142 ring->head = sg_dma_len(&atmel_port->sg_rx) - state.residue; in atmel_rx_from_dma()
1143 BUG_ON(ring->head > sg_dma_len(&atmel_port->sg_rx)); in atmel_rx_from_dma()
1145 * At this point ring->head may point to the first byte right after the in atmel_rx_from_dma()
1147 * 0 <= ring->head <= sg_dma_len(&atmel_port->sg_rx) in atmel_rx_from_dma()
1149 * However ring->tail must always points inside the dma buffer: in atmel_rx_from_dma()
1150 * 0 <= ring->tail <= sg_dma_len(&atmel_port->sg_rx) - 1 in atmel_rx_from_dma()
1156 if (ring->head < ring->tail) { in atmel_rx_from_dma()
1157 count = sg_dma_len(&atmel_port->sg_rx) - ring->tail; in atmel_rx_from_dma()
1159 tty_insert_flip_string(tport, ring->buf + ring->tail, count); in atmel_rx_from_dma()
1160 ring->tail = 0; in atmel_rx_from_dma()
1161 port->icount.rx += count; in atmel_rx_from_dma()
1165 if (ring->tail < ring->head) { in atmel_rx_from_dma()
1166 count = ring->head - ring->tail; in atmel_rx_from_dma()
1168 tty_insert_flip_string(tport, ring->buf + ring->tail, count); in atmel_rx_from_dma()
1169 /* Wrap ring->head if needed */ in atmel_rx_from_dma()
1170 if (ring->head >= sg_dma_len(&atmel_port->sg_rx)) in atmel_rx_from_dma()
1171 ring->head = 0; in atmel_rx_from_dma()
1172 ring->tail = ring->head; in atmel_rx_from_dma()
1173 port->icount.rx += count; in atmel_rx_from_dma()
1177 dma_sync_sg_for_device(port->dev, in atmel_rx_from_dma()
1178 &atmel_port->sg_rx, in atmel_rx_from_dma()
1190 struct device *mfd_dev = port->dev->parent; in atmel_prepare_rx_dma()
1198 ring = &atmel_port->rx_ring; in atmel_prepare_rx_dma()
1205 atmel_port->chan_rx = NULL; in atmel_prepare_rx_dma()
1208 atmel_port->chan_rx = chan; in atmel_prepare_rx_dma()
1209 dev_info(port->dev, "using %s for rx DMA transfers\n", in atmel_prepare_rx_dma()
1210 dma_chan_name(atmel_port->chan_rx)); in atmel_prepare_rx_dma()
1212 spin_lock_init(&atmel_port->lock_rx); in atmel_prepare_rx_dma()
1213 sg_init_table(&atmel_port->sg_rx, 1); in atmel_prepare_rx_dma()
1215 BUG_ON(!PAGE_ALIGNED(ring->buf)); in atmel_prepare_rx_dma()
1216 sg_set_page(&atmel_port->sg_rx, in atmel_prepare_rx_dma()
1217 virt_to_page(ring->buf), in atmel_prepare_rx_dma()
1219 offset_in_page(ring->buf)); in atmel_prepare_rx_dma()
1220 nent = dma_map_sg(port->dev, in atmel_prepare_rx_dma()
1221 &atmel_port->sg_rx, in atmel_prepare_rx_dma()
1226 dev_dbg(port->dev, "need to release resource of dma\n"); in atmel_prepare_rx_dma()
1229 dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", __func__, in atmel_prepare_rx_dma()
1230 sg_dma_len(&atmel_port->sg_rx), in atmel_prepare_rx_dma()
1231 ring->buf, in atmel_prepare_rx_dma()
1232 &sg_dma_address(&atmel_port->sg_rx)); in atmel_prepare_rx_dma()
1239 config.src_addr = port->mapbase + ATMEL_US_RHR; in atmel_prepare_rx_dma()
1242 ret = dmaengine_slave_config(atmel_port->chan_rx, in atmel_prepare_rx_dma()
1245 dev_err(port->dev, "DMA rx slave configuration failed\n"); in atmel_prepare_rx_dma()
1252 desc = dmaengine_prep_dma_cyclic(atmel_port->chan_rx, in atmel_prepare_rx_dma()
1253 sg_dma_address(&atmel_port->sg_rx), in atmel_prepare_rx_dma()
1254 sg_dma_len(&atmel_port->sg_rx), in atmel_prepare_rx_dma()
1255 sg_dma_len(&atmel_port->sg_rx)/2, in atmel_prepare_rx_dma()
1259 dev_err(port->dev, "Preparing DMA cyclic failed\n"); in atmel_prepare_rx_dma()
1262 desc->callback = atmel_complete_rx_dma; in atmel_prepare_rx_dma()
1263 desc->callback_param = port; in atmel_prepare_rx_dma()
1264 atmel_port->desc_rx = desc; in atmel_prepare_rx_dma()
1265 atmel_port->cookie_rx = dmaengine_submit(desc); in atmel_prepare_rx_dma()
1266 if (dma_submit_error(atmel_port->cookie_rx)) { in atmel_prepare_rx_dma()
1267 dev_err(port->dev, "dma_submit_error %d\n", in atmel_prepare_rx_dma()
1268 atmel_port->cookie_rx); in atmel_prepare_rx_dma()
1272 dma_async_issue_pending(atmel_port->chan_rx); in atmel_prepare_rx_dma()
1277 dev_err(port->dev, "RX channel not available, switch to pio\n"); in atmel_prepare_rx_dma()
1278 atmel_port->use_dma_rx = false; in atmel_prepare_rx_dma()
1279 if (atmel_port->chan_rx) in atmel_prepare_rx_dma()
1281 return -EINVAL; in atmel_prepare_rx_dma()
1288 struct uart_port *port = &atmel_port->uart; in atmel_uart_timer_callback()
1290 if (!atomic_read(&atmel_port->tasklet_shutdown)) { in atmel_uart_timer_callback()
1291 tasklet_schedule(&atmel_port->tasklet_rx); in atmel_uart_timer_callback()
1292 mod_timer(&atmel_port->uart_timer, in atmel_uart_timer_callback()
1317 &atmel_port->tasklet_rx); in atmel_handle_receive()
1330 &atmel_port->tasklet_rx); in atmel_handle_receive()
1344 atmel_port->break_active = 0; in atmel_handle_receive()
1356 if (pending & atmel_port->tx_done_mask) { in atmel_handle_transmit()
1358 atmel_port->tx_done_mask); in atmel_handle_transmit()
1361 if (atmel_port->hd_start_rx) { in atmel_handle_transmit()
1364 dev_warn(port->dev, "Should start RX, but TX fifo is not empty\n"); in atmel_handle_transmit()
1366 atmel_port->hd_start_rx = false; in atmel_handle_transmit()
1370 atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx); in atmel_handle_transmit()
1386 status_change = status ^ atmel_port->irq_status_prev; in atmel_handle_status()
1387 atmel_port->irq_status_prev = status; in atmel_handle_status()
1393 port->icount.rng++; in atmel_handle_status()
1395 port->icount.dsr++; in atmel_handle_status()
1401 wake_up_interruptible(&port->state->port.delta_msr_wait); in atmel_handle_status()
1406 dev_dbg(port->dev, "ISO7816 ERROR (0x%08x)\n", pending); in atmel_handle_status()
1418 spin_lock(&atmel_port->lock_suspended); in atmel_interrupt()
1427 if (atmel_port->suspended) { in atmel_interrupt()
1428 atmel_port->pending |= pending; in atmel_interrupt()
1429 atmel_port->pending_status = status; in atmel_interrupt()
1440 spin_unlock(&atmel_port->lock_suspended); in atmel_interrupt()
1448 struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx; in atmel_release_tx_pdc()
1450 dma_unmap_single(port->dev, in atmel_release_tx_pdc()
1451 pdc->dma_addr, in atmel_release_tx_pdc()
1452 pdc->dma_size, in atmel_release_tx_pdc()
1462 struct circ_buf *xmit = &port->state->xmit; in atmel_tx_pdc()
1463 struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx; in atmel_tx_pdc()
1469 uart_xmit_advance(port, pdc->ofs); in atmel_tx_pdc()
1470 pdc->ofs = 0; in atmel_tx_pdc()
1472 /* more to transmit - setup next transfer */ in atmel_tx_pdc()
1478 dma_sync_single_for_device(port->dev, in atmel_tx_pdc()
1479 pdc->dma_addr, in atmel_tx_pdc()
1480 pdc->dma_size, in atmel_tx_pdc()
1483 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); in atmel_tx_pdc()
1484 pdc->ofs = count; in atmel_tx_pdc()
1487 pdc->dma_addr + xmit->tail); in atmel_tx_pdc()
1489 /* re-enable PDC transmit */ in atmel_tx_pdc()
1493 atmel_port->tx_done_mask); in atmel_tx_pdc()
1496 /* DMA done, stop TX, start RX for RS485 */ in atmel_tx_pdc()
1508 struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx; in atmel_prepare_tx_pdc()
1509 struct circ_buf *xmit = &port->state->xmit; in atmel_prepare_tx_pdc()
1511 pdc->buf = xmit->buf; in atmel_prepare_tx_pdc()
1512 pdc->dma_addr = dma_map_single(port->dev, in atmel_prepare_tx_pdc()
1513 pdc->buf, in atmel_prepare_tx_pdc()
1516 pdc->dma_size = UART_XMIT_SIZE; in atmel_prepare_tx_pdc()
1517 pdc->ofs = 0; in atmel_prepare_tx_pdc()
1525 struct circ_buf *ring = &atmel_port->rx_ring; in atmel_rx_from_ring()
1529 while (ring->head != ring->tail) { in atmel_rx_from_ring()
1535 c = ((struct atmel_uart_char *)ring->buf)[ring->tail]; in atmel_rx_from_ring()
1537 ring->tail = (ring->tail + 1) & (ATMEL_SERIAL_RINGSIZE - 1); in atmel_rx_from_ring()
1539 port->icount.rx++; in atmel_rx_from_ring()
1550 /* ignore side-effect */ in atmel_rx_from_ring()
1553 port->icount.brk++; in atmel_rx_from_ring()
1558 port->icount.parity++; in atmel_rx_from_ring()
1560 port->icount.frame++; in atmel_rx_from_ring()
1562 port->icount.overrun++; in atmel_rx_from_ring()
1564 status &= port->read_status_mask; in atmel_rx_from_ring()
1581 tty_flip_buffer_push(&port->state->port); in atmel_rx_from_ring()
1590 struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i]; in atmel_release_rx_pdc()
1592 dma_unmap_single(port->dev, in atmel_release_rx_pdc()
1593 pdc->dma_addr, in atmel_release_rx_pdc()
1594 pdc->dma_size, in atmel_release_rx_pdc()
1596 kfree(pdc->buf); in atmel_release_rx_pdc()
1603 struct tty_port *tport = &port->state->port; in atmel_rx_from_pdc()
1605 int rx_idx = atmel_port->pdc_rx_idx; in atmel_rx_from_pdc()
1614 pdc = &atmel_port->pdc_rx[rx_idx]; in atmel_rx_from_pdc()
1615 head = atmel_uart_readl(port, ATMEL_PDC_RPR) - pdc->dma_addr; in atmel_rx_from_pdc()
1616 tail = pdc->ofs; in atmel_rx_from_pdc()
1620 * is unsigned, we just need a one-way comparison to in atmel_rx_from_pdc()
1625 * ENDRX bit as well, so that we can safely re-enable in atmel_rx_from_pdc()
1628 head = min(head, pdc->dma_size); in atmel_rx_from_pdc()
1631 dma_sync_single_for_cpu(port->dev, pdc->dma_addr, in atmel_rx_from_pdc()
1632 pdc->dma_size, DMA_FROM_DEVICE); in atmel_rx_from_pdc()
1640 count = head - tail; in atmel_rx_from_pdc()
1642 tty_insert_flip_string(tport, pdc->buf + pdc->ofs, in atmel_rx_from_pdc()
1645 dma_sync_single_for_device(port->dev, pdc->dma_addr, in atmel_rx_from_pdc()
1646 pdc->dma_size, DMA_FROM_DEVICE); in atmel_rx_from_pdc()
1648 port->icount.rx += count; in atmel_rx_from_pdc()
1649 pdc->ofs = head; in atmel_rx_from_pdc()
1656 if (head >= pdc->dma_size) { in atmel_rx_from_pdc()
1657 pdc->ofs = 0; in atmel_rx_from_pdc()
1658 atmel_uart_writel(port, ATMEL_PDC_RNPR, pdc->dma_addr); in atmel_rx_from_pdc()
1659 atmel_uart_writel(port, ATMEL_PDC_RNCR, pdc->dma_size); in atmel_rx_from_pdc()
1662 atmel_port->pdc_rx_idx = rx_idx; in atmel_rx_from_pdc()
1664 } while (head >= pdc->dma_size); in atmel_rx_from_pdc()
1678 struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i]; in atmel_prepare_rx_pdc()
1680 pdc->buf = kmalloc(PDC_BUFFER_SIZE, GFP_KERNEL); in atmel_prepare_rx_pdc()
1681 if (pdc->buf == NULL) { in atmel_prepare_rx_pdc()
1683 dma_unmap_single(port->dev, in atmel_prepare_rx_pdc()
1684 atmel_port->pdc_rx[0].dma_addr, in atmel_prepare_rx_pdc()
1687 kfree(atmel_port->pdc_rx[0].buf); in atmel_prepare_rx_pdc()
1689 atmel_port->use_pdc_rx = false; in atmel_prepare_rx_pdc()
1690 return -ENOMEM; in atmel_prepare_rx_pdc()
1692 pdc->dma_addr = dma_map_single(port->dev, in atmel_prepare_rx_pdc()
1693 pdc->buf, in atmel_prepare_rx_pdc()
1696 pdc->dma_size = PDC_BUFFER_SIZE; in atmel_prepare_rx_pdc()
1697 pdc->ofs = 0; in atmel_prepare_rx_pdc()
1700 atmel_port->pdc_rx_idx = 0; in atmel_prepare_rx_pdc()
1702 atmel_uart_writel(port, ATMEL_PDC_RPR, atmel_port->pdc_rx[0].dma_addr); in atmel_prepare_rx_pdc()
1706 atmel_port->pdc_rx[1].dma_addr); in atmel_prepare_rx_pdc()
1719 struct uart_port *port = &atmel_port->uart; in atmel_tasklet_rx_func()
1723 atmel_port->schedule_rx(port); in atmel_tasklet_rx_func()
1731 struct uart_port *port = &atmel_port->uart; in atmel_tasklet_tx_func()
1735 atmel_port->schedule_tx(port); in atmel_tasklet_tx_func()
1742 struct device_node *np = pdev->dev.of_node; in atmel_init_property()
1745 if (of_property_read_bool(np, "atmel,use-dma-rx")) { in atmel_init_property()
1747 atmel_port->use_dma_rx = true; in atmel_init_property()
1748 atmel_port->use_pdc_rx = false; in atmel_init_property()
1750 atmel_port->use_dma_rx = false; in atmel_init_property()
1751 atmel_port->use_pdc_rx = true; in atmel_init_property()
1754 atmel_port->use_dma_rx = false; in atmel_init_property()
1755 atmel_port->use_pdc_rx = false; in atmel_init_property()
1758 if (of_property_read_bool(np, "atmel,use-dma-tx")) { in atmel_init_property()
1760 atmel_port->use_dma_tx = true; in atmel_init_property()
1761 atmel_port->use_pdc_tx = false; in atmel_init_property()
1763 atmel_port->use_dma_tx = false; in atmel_init_property()
1764 atmel_port->use_pdc_tx = true; in atmel_init_property()
1767 atmel_port->use_dma_tx = false; in atmel_init_property()
1768 atmel_port->use_pdc_tx = false; in atmel_init_property()
1777 atmel_port->prepare_rx = &atmel_prepare_rx_dma; in atmel_set_ops()
1778 atmel_port->schedule_rx = &atmel_rx_from_dma; in atmel_set_ops()
1779 atmel_port->release_rx = &atmel_release_rx_dma; in atmel_set_ops()
1781 atmel_port->prepare_rx = &atmel_prepare_rx_pdc; in atmel_set_ops()
1782 atmel_port->schedule_rx = &atmel_rx_from_pdc; in atmel_set_ops()
1783 atmel_port->release_rx = &atmel_release_rx_pdc; in atmel_set_ops()
1785 atmel_port->prepare_rx = NULL; in atmel_set_ops()
1786 atmel_port->schedule_rx = &atmel_rx_from_ring; in atmel_set_ops()
1787 atmel_port->release_rx = NULL; in atmel_set_ops()
1791 atmel_port->prepare_tx = &atmel_prepare_tx_dma; in atmel_set_ops()
1792 atmel_port->schedule_tx = &atmel_tx_dma; in atmel_set_ops()
1793 atmel_port->release_tx = &atmel_release_tx_dma; in atmel_set_ops()
1795 atmel_port->prepare_tx = &atmel_prepare_tx_pdc; in atmel_set_ops()
1796 atmel_port->schedule_tx = &atmel_tx_pdc; in atmel_set_ops()
1797 atmel_port->release_tx = &atmel_release_tx_pdc; in atmel_set_ops()
1799 atmel_port->prepare_tx = NULL; in atmel_set_ops()
1800 atmel_port->schedule_tx = &atmel_tx_chars; in atmel_set_ops()
1801 atmel_port->release_tx = NULL; in atmel_set_ops()
1825 atmel_port->has_frac_baudrate = false; in atmel_get_ip_name()
1826 atmel_port->has_hw_timer = false; in atmel_get_ip_name()
1827 atmel_port->is_usart = false; in atmel_get_ip_name()
1830 dev_dbg(port->dev, "Uart with hw timer"); in atmel_get_ip_name()
1831 atmel_port->has_hw_timer = true; in atmel_get_ip_name()
1832 atmel_port->rtor = ATMEL_UA_RTOR; in atmel_get_ip_name()
1834 dev_dbg(port->dev, "Usart\n"); in atmel_get_ip_name()
1835 atmel_port->has_frac_baudrate = true; in atmel_get_ip_name()
1836 atmel_port->has_hw_timer = true; in atmel_get_ip_name()
1837 atmel_port->is_usart = true; in atmel_get_ip_name()
1838 atmel_port->rtor = ATMEL_US_RTOR; in atmel_get_ip_name()
1844 atmel_port->fidi_min = 3; in atmel_get_ip_name()
1845 atmel_port->fidi_max = 65535; in atmel_get_ip_name()
1848 atmel_port->fidi_min = 3; in atmel_get_ip_name()
1849 atmel_port->fidi_max = 2047; in atmel_get_ip_name()
1852 atmel_port->fidi_min = 1; in atmel_get_ip_name()
1853 atmel_port->fidi_max = 2047; in atmel_get_ip_name()
1856 dev_dbg(port->dev, "Dbgu or uart without hw timer\n"); in atmel_get_ip_name()
1864 dev_dbg(port->dev, "This version is usart\n"); in atmel_get_ip_name()
1865 atmel_port->has_frac_baudrate = true; in atmel_get_ip_name()
1866 atmel_port->has_hw_timer = true; in atmel_get_ip_name()
1867 atmel_port->is_usart = true; in atmel_get_ip_name()
1868 atmel_port->rtor = ATMEL_US_RTOR; in atmel_get_ip_name()
1872 dev_dbg(port->dev, "This version is uart\n"); in atmel_get_ip_name()
1875 dev_err(port->dev, "Not supported ip name nor version, set to uart\n"); in atmel_get_ip_name()
1885 struct platform_device *pdev = to_platform_device(port->dev); in atmel_startup()
1894 atmel_uart_writel(port, ATMEL_US_IDR, -1); in atmel_startup()
1895 atmel_port->ms_irq_enabled = false; in atmel_startup()
1900 retval = request_irq(port->irq, atmel_interrupt, in atmel_startup()
1902 dev_name(&pdev->dev), port); in atmel_startup()
1904 dev_err(port->dev, "atmel_startup - Can't get irq\n"); in atmel_startup()
1908 atomic_set(&atmel_port->tasklet_shutdown, 0); in atmel_startup()
1909 tasklet_setup(&atmel_port->tasklet_rx, atmel_tasklet_rx_func); in atmel_startup()
1910 tasklet_setup(&atmel_port->tasklet_tx, atmel_tasklet_tx_func); in atmel_startup()
1918 if (atmel_port->prepare_rx) { in atmel_startup()
1919 retval = atmel_port->prepare_rx(port); in atmel_startup()
1924 if (atmel_port->prepare_tx) { in atmel_startup()
1925 retval = atmel_port->prepare_tx(port); in atmel_startup()
1933 if (atmel_port->fifo_size) { in atmel_startup()
1947 if (atmel_port->rts_high && in atmel_startup()
1948 atmel_port->rts_low) in atmel_startup()
1950 ATMEL_US_RXFTHRES(atmel_port->rts_high) | in atmel_startup()
1951 ATMEL_US_RXFTHRES2(atmel_port->rts_low); in atmel_startup()
1957 atmel_port->irq_status_prev = atmel_uart_readl(port, ATMEL_US_CSR); in atmel_startup()
1965 atmel_port->tx_stopped = false; in atmel_startup()
1967 timer_setup(&atmel_port->uart_timer, atmel_uart_timer_callback, 0); in atmel_startup()
1971 if (!atmel_port->has_hw_timer) { in atmel_startup()
1972 mod_timer(&atmel_port->uart_timer, in atmel_startup()
1976 atmel_uart_writel(port, atmel_port->rtor, in atmel_startup()
1987 if (!atmel_port->has_hw_timer) { in atmel_startup()
1988 mod_timer(&atmel_port->uart_timer, in atmel_startup()
1992 atmel_uart_writel(port, atmel_port->rtor, in atmel_startup()
2017 atmel_port->pdc_tx.ofs = 0; in atmel_flush_buffer()
2023 atmel_port->tx_len = 0; in atmel_flush_buffer()
2037 atmel_uart_writel(port, ATMEL_US_IDR, -1); in atmel_shutdown()
2040 atomic_inc(&atmel_port->tasklet_shutdown); in atmel_shutdown()
2046 del_timer_sync(&atmel_port->uart_timer); in atmel_shutdown()
2049 synchronize_irq(port->irq); in atmel_shutdown()
2055 tasklet_kill(&atmel_port->tasklet_rx); in atmel_shutdown()
2056 tasklet_kill(&atmel_port->tasklet_tx); in atmel_shutdown()
2068 * Shut-down the DMA. in atmel_shutdown()
2070 if (atmel_port->release_rx) in atmel_shutdown()
2071 atmel_port->release_rx(port); in atmel_shutdown()
2072 if (atmel_port->release_tx) in atmel_shutdown()
2073 atmel_port->release_tx(port); in atmel_shutdown()
2078 atmel_port->rx_ring.head = 0; in atmel_shutdown()
2079 atmel_port->rx_ring.tail = 0; in atmel_shutdown()
2084 free_irq(port->irq, port); in atmel_shutdown()
2103 clk_prepare_enable(atmel_port->clk); in atmel_serial_pm()
2105 /* re-enable interrupts if we disabled some on suspend */ in atmel_serial_pm()
2106 atmel_uart_writel(port, ATMEL_US_IER, atmel_port->backup_imr); in atmel_serial_pm()
2110 atmel_port->backup_imr = atmel_uart_readl(port, ATMEL_US_IMR); in atmel_serial_pm()
2111 atmel_uart_writel(port, ATMEL_US_IDR, -1); in atmel_serial_pm()
2117 clk_disable_unprepare(atmel_port->clk); in atmel_serial_pm()
2118 if (__clk_is_enabled(atmel_port->gclk)) in atmel_serial_pm()
2119 clk_disable_unprepare(atmel_port->gclk); in atmel_serial_pm()
2122 dev_err(port->dev, "atmel_serial: unknown pm %d\n", state); in atmel_serial_pm()
2143 if (atmel_port->is_usart) in atmel_set_termios()
2149 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); in atmel_set_termios()
2152 switch (termios->c_cflag & CSIZE) { in atmel_set_termios()
2168 if (termios->c_cflag & CSTOPB) in atmel_set_termios()
2172 if (termios->c_cflag & PARENB) { in atmel_set_termios()
2174 if (termios->c_cflag & CMSPAR) { in atmel_set_termios()
2175 if (termios->c_cflag & PARODD) in atmel_set_termios()
2179 } else if (termios->c_cflag & PARODD) in atmel_set_termios()
2188 port->read_status_mask = ATMEL_US_OVRE; in atmel_set_termios()
2189 if (termios->c_iflag & INPCK) in atmel_set_termios()
2190 port->read_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE); in atmel_set_termios()
2191 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) in atmel_set_termios()
2192 port->read_status_mask |= ATMEL_US_RXBRK; in atmel_set_termios()
2196 atmel_uart_writel(port, ATMEL_US_IER, port->read_status_mask); in atmel_set_termios()
2201 port->ignore_status_mask = 0; in atmel_set_termios()
2202 if (termios->c_iflag & IGNPAR) in atmel_set_termios()
2203 port->ignore_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE); in atmel_set_termios()
2204 if (termios->c_iflag & IGNBRK) { in atmel_set_termios()
2205 port->ignore_status_mask |= ATMEL_US_RXBRK; in atmel_set_termios()
2210 if (termios->c_iflag & IGNPAR) in atmel_set_termios()
2211 port->ignore_status_mask |= ATMEL_US_OVRE; in atmel_set_termios()
2215 /* update the per-port timeout */ in atmel_set_termios()
2216 uart_update_timeout(port, termios->c_cflag, baud); in atmel_set_termios()
2224 atmel_uart_writel(port, ATMEL_US_IDR, -1); in atmel_set_termios()
2228 atmel_port->tx_stopped = true; in atmel_set_termios()
2231 if (port->rs485.flags & SER_RS485_ENABLED) { in atmel_set_termios()
2233 port->rs485.delay_rts_after_send); in atmel_set_termios()
2235 } else if (port->iso7816.flags & SER_ISO7816_ENABLED) { in atmel_set_termios()
2236 atmel_uart_writel(port, ATMEL_US_TTGR, port->iso7816.tg); in atmel_set_termios()
2241 if ((port->iso7816.flags & SER_ISO7816_T_PARAM) in atmel_set_termios()
2246 } else if (termios->c_cflag & CRTSCTS) { in atmel_set_termios()
2247 /* RS232 with hardware handshake (RTS/CTS) */ in atmel_set_termios()
2249 !mctrl_gpio_to_gpiod(atmel_port->gpios, UART_GPIO_CTS)) { in atmel_set_termios()
2252 * be able to drive the RTS pin high/low when the RX in atmel_set_termios()
2258 * disabled (there must be an internal pull-up in atmel_set_termios()
2260 * If the RTS pin is a GPIO, the controller won't be in atmel_set_termios()
2281 * baudrate = selected clock / (8 * (2 - OVER) * (CD + FP / 8)) in atmel_set_termios()
2287 if (atmel_port->has_frac_baudrate) { in atmel_set_termios()
2288 div = DIV_ROUND_CLOSEST(port->uartclk, baud * 2); in atmel_set_termios()
2303 if (atmel_port->is_usart && cd > ATMEL_US_CD) { in atmel_set_termios()
2316 if (!atmel_port->has_frac_baudrate) { in atmel_set_termios()
2317 if (__clk_is_enabled(atmel_port->gclk)) in atmel_set_termios()
2318 clk_disable_unprepare(atmel_port->gclk); in atmel_set_termios()
2319 gclk_rate = clk_round_rate(atmel_port->gclk, 16 * baud); in atmel_set_termios()
2320 actual_baud = clk_get_rate(atmel_port->clk) / (16 * cd); in atmel_set_termios()
2323 clk_set_rate(atmel_port->gclk, 16 * baud); in atmel_set_termios()
2324 ret = clk_prepare_enable(atmel_port->gclk); in atmel_set_termios()
2328 if (atmel_port->is_usart) { in atmel_set_termios()
2351 if (!(port->iso7816.flags & SER_ISO7816_ENABLED)) in atmel_set_termios()
2358 * when switching the mode, set the RTS line state according to the in atmel_set_termios()
2365 /* let the hardware control the RTS line */ in atmel_set_termios()
2368 /* force RTS line to low level */ in atmel_set_termios()
2377 atmel_port->tx_stopped = false; in atmel_set_termios()
2382 /* CTS flow-control and modem-status interrupts */ in atmel_set_termios()
2383 if (UART_ENABLE_MS(port, termios->c_cflag)) in atmel_set_termios()
2393 if (termios->c_line == N_PPS) { in atmel_set_ldisc()
2394 port->flags |= UPF_HARDPPS_CD; in atmel_set_ldisc()
2399 port->flags &= ~UPF_HARDPPS_CD; in atmel_set_ldisc()
2400 if (!UART_ENABLE_MS(port, termios->c_cflag)) { in atmel_set_ldisc()
2413 return (port->type == PORT_ATMEL) ? "ATMEL_SERIAL" : NULL; in atmel_type()
2421 struct platform_device *mpdev = to_platform_device(port->dev->parent); in atmel_release_port()
2422 int size = resource_size(mpdev->resource); in atmel_release_port()
2424 release_mem_region(port->mapbase, size); in atmel_release_port()
2426 if (port->flags & UPF_IOREMAP) { in atmel_release_port()
2427 iounmap(port->membase); in atmel_release_port()
2428 port->membase = NULL; in atmel_release_port()
2437 struct platform_device *mpdev = to_platform_device(port->dev->parent); in atmel_request_port()
2438 int size = resource_size(mpdev->resource); in atmel_request_port()
2440 if (!request_mem_region(port->mapbase, size, "atmel_serial")) in atmel_request_port()
2441 return -EBUSY; in atmel_request_port()
2443 if (port->flags & UPF_IOREMAP) { in atmel_request_port()
2444 port->membase = ioremap(port->mapbase, size); in atmel_request_port()
2445 if (port->membase == NULL) { in atmel_request_port()
2446 release_mem_region(port->mapbase, size); in atmel_request_port()
2447 return -ENOMEM; in atmel_request_port()
2460 port->type = PORT_ATMEL; in atmel_config_port()
2471 if (ser->type != PORT_UNKNOWN && ser->type != PORT_ATMEL) in atmel_verify_port()
2472 ret = -EINVAL; in atmel_verify_port()
2473 if (port->irq != ser->irq) in atmel_verify_port()
2474 ret = -EINVAL; in atmel_verify_port()
2475 if (ser->io_type != SERIAL_IO_MEM) in atmel_verify_port()
2476 ret = -EINVAL; in atmel_verify_port()
2477 if (port->uartclk / 16 != ser->baud_base) in atmel_verify_port()
2478 ret = -EINVAL; in atmel_verify_port()
2479 if (port->mapbase != (unsigned long)ser->iomem_base) in atmel_verify_port()
2480 ret = -EINVAL; in atmel_verify_port()
2481 if (port->iobase != ser->port) in atmel_verify_port()
2482 ret = -EINVAL; in atmel_verify_port()
2483 if (ser->hub6 != 0) in atmel_verify_port()
2484 ret = -EINVAL; in atmel_verify_port()
2545 struct uart_port *port = &atmel_port->uart; in atmel_init_port()
2546 struct platform_device *mpdev = to_platform_device(pdev->dev.parent); in atmel_init_port()
2551 port->iotype = UPIO_MEM; in atmel_init_port()
2552 port->flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP; in atmel_init_port()
2553 port->ops = &atmel_pops; in atmel_init_port()
2554 port->fifosize = 1; in atmel_init_port()
2555 port->dev = &pdev->dev; in atmel_init_port()
2556 port->mapbase = mpdev->resource[0].start; in atmel_init_port()
2557 port->irq = platform_get_irq(mpdev, 0); in atmel_init_port()
2558 port->rs485_config = atmel_config_rs485; in atmel_init_port()
2559 port->rs485_supported = atmel_rs485_supported; in atmel_init_port()
2560 port->iso7816_config = atmel_config_iso7816; in atmel_init_port()
2561 port->membase = NULL; in atmel_init_port()
2563 memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring)); in atmel_init_port()
2569 port->uartclk = clk_get_rate(atmel_port->clk); in atmel_init_port()
2572 * Use TXEMPTY for interrupt when rs485 or ISO7816 else TXRDY or in atmel_init_port()
2576 atmel_port->tx_done_mask = ATMEL_US_TXEMPTY; in atmel_init_port()
2578 port->fifosize = PDC_BUFFER_SIZE; in atmel_init_port()
2579 atmel_port->tx_done_mask = ATMEL_US_ENDTX | ATMEL_US_TXBUFE; in atmel_init_port()
2581 atmel_port->tx_done_mask = ATMEL_US_TXRDY; in atmel_init_port()
2600 struct uart_port *port = &atmel_ports[co->index].uart; in atmel_console_write()
2610 ATMEL_US_RXRDY | atmel_port->tx_done_mask); in atmel_console_write()
2618 atmel_port->tx_stopped = false; in atmel_console_write()
2667 *baud = port->uartclk / (16 * quot); in atmel_console_get_options()
2672 struct uart_port *port = &atmel_ports[co->index].uart; in atmel_console_setup()
2679 if (port->membase == NULL) { in atmel_console_setup()
2680 /* Port not initialized yet - delay setup */ in atmel_console_setup()
2681 return -ENODEV; in atmel_console_setup()
2684 atmel_uart_writel(port, ATMEL_US_IDR, -1); in atmel_console_setup()
2687 atmel_port->tx_stopped = false; in atmel_console_setup()
2705 .index = -1,
2712 struct earlycon_device *dev = con->data; in atmel_serial_early_write()
2714 uart_console_write(&dev->port, s, n, atmel_console_putchar); in atmel_serial_early_write()
2720 if (!device->port.membase) in atmel_early_console_setup()
2721 return -ENODEV; in atmel_early_console_setup()
2723 device->con->write = atmel_serial_early_write; in atmel_early_console_setup()
2728 OF_EARLYCON_DECLARE(atmel_serial, "atmel,at91rm9200-usart",
2730 OF_EARLYCON_DECLARE(atmel_serial, "atmel,at91sam9260-usart",
2774 atmel_port->cache.mr = atmel_uart_readl(port, ATMEL_US_MR); in atmel_serial_suspend()
2775 atmel_port->cache.imr = atmel_uart_readl(port, ATMEL_US_IMR); in atmel_serial_suspend()
2776 atmel_port->cache.brgr = atmel_uart_readl(port, ATMEL_US_BRGR); in atmel_serial_suspend()
2777 atmel_port->cache.rtor = atmel_uart_readl(port, in atmel_serial_suspend()
2778 atmel_port->rtor); in atmel_serial_suspend()
2779 atmel_port->cache.ttgr = atmel_uart_readl(port, ATMEL_US_TTGR); in atmel_serial_suspend()
2780 atmel_port->cache.fmr = atmel_uart_readl(port, ATMEL_US_FMR); in atmel_serial_suspend()
2781 atmel_port->cache.fimr = atmel_uart_readl(port, ATMEL_US_FIMR); in atmel_serial_suspend()
2785 atmel_port->may_wakeup = device_may_wakeup(dev); in atmel_serial_suspend()
2789 spin_lock_irqsave(&atmel_port->lock_suspended, flags); in atmel_serial_suspend()
2790 atmel_port->suspended = true; in atmel_serial_suspend()
2791 spin_unlock_irqrestore(&atmel_port->lock_suspended, flags); in atmel_serial_suspend()
2807 atmel_uart_writel(port, ATMEL_US_MR, atmel_port->cache.mr); in atmel_serial_resume()
2808 atmel_uart_writel(port, ATMEL_US_IER, atmel_port->cache.imr); in atmel_serial_resume()
2809 atmel_uart_writel(port, ATMEL_US_BRGR, atmel_port->cache.brgr); in atmel_serial_resume()
2810 atmel_uart_writel(port, atmel_port->rtor, in atmel_serial_resume()
2811 atmel_port->cache.rtor); in atmel_serial_resume()
2812 atmel_uart_writel(port, ATMEL_US_TTGR, atmel_port->cache.ttgr); in atmel_serial_resume()
2814 if (atmel_port->fifo_size) { in atmel_serial_resume()
2818 atmel_port->cache.fmr); in atmel_serial_resume()
2820 atmel_port->cache.fimr); in atmel_serial_resume()
2825 spin_lock_irqsave(&atmel_port->lock_suspended, flags); in atmel_serial_resume()
2826 if (atmel_port->pending) { in atmel_serial_resume()
2827 atmel_handle_receive(port, atmel_port->pending); in atmel_serial_resume()
2828 atmel_handle_status(port, atmel_port->pending, in atmel_serial_resume()
2829 atmel_port->pending_status); in atmel_serial_resume()
2830 atmel_handle_transmit(port, atmel_port->pending); in atmel_serial_resume()
2831 atmel_port->pending = 0; in atmel_serial_resume()
2833 atmel_port->suspended = false; in atmel_serial_resume()
2834 spin_unlock_irqrestore(&atmel_port->lock_suspended, flags); in atmel_serial_resume()
2837 device_set_wakeup_enable(dev, atmel_port->may_wakeup); in atmel_serial_resume()
2845 atmel_port->fifo_size = 0; in atmel_serial_probe_fifos()
2846 atmel_port->rts_low = 0; in atmel_serial_probe_fifos()
2847 atmel_port->rts_high = 0; in atmel_serial_probe_fifos()
2849 if (of_property_read_u32(pdev->dev.of_node, in atmel_serial_probe_fifos()
2850 "atmel,fifo-size", in atmel_serial_probe_fifos()
2851 &atmel_port->fifo_size)) in atmel_serial_probe_fifos()
2854 if (!atmel_port->fifo_size) in atmel_serial_probe_fifos()
2857 if (atmel_port->fifo_size < ATMEL_MIN_FIFO_SIZE) { in atmel_serial_probe_fifos()
2858 atmel_port->fifo_size = 0; in atmel_serial_probe_fifos()
2859 dev_err(&pdev->dev, "Invalid FIFO size\n"); in atmel_serial_probe_fifos()
2867 * actually stopping to send new data. So we try to set the RTS High in atmel_serial_probe_fifos()
2871 atmel_port->rts_high = max_t(int, atmel_port->fifo_size >> 1, in atmel_serial_probe_fifos()
2872 atmel_port->fifo_size - ATMEL_RTS_HIGH_OFFSET); in atmel_serial_probe_fifos()
2873 atmel_port->rts_low = max_t(int, atmel_port->fifo_size >> 2, in atmel_serial_probe_fifos()
2874 atmel_port->fifo_size - ATMEL_RTS_LOW_OFFSET); in atmel_serial_probe_fifos()
2876 dev_info(&pdev->dev, "Using FIFO (%u data)\n", in atmel_serial_probe_fifos()
2877 atmel_port->fifo_size); in atmel_serial_probe_fifos()
2878 dev_dbg(&pdev->dev, "RTS High Threshold : %2u data\n", in atmel_serial_probe_fifos()
2879 atmel_port->rts_high); in atmel_serial_probe_fifos()
2880 dev_dbg(&pdev->dev, "RTS Low Threshold : %2u data\n", in atmel_serial_probe_fifos()
2881 atmel_port->rts_low); in atmel_serial_probe_fifos()
2887 struct device_node *np = pdev->dev.parent->of_node; in atmel_serial_probe()
2892 BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1)); in atmel_serial_probe()
2895 * In device tree there is no node with "atmel,at91rm9200-usart-serial" in atmel_serial_probe()
2896 * as compatible string. This driver is probed by at91-usart mfd driver in atmel_serial_probe()
2898 * spi-at91-usart driver. All attributes needed by this driver are in atmel_serial_probe()
2901 pdev->dev.of_node = np; in atmel_serial_probe()
2905 /* port id not found in platform data nor device-tree aliases: in atmel_serial_probe()
2906 * auto-enumerate it */ in atmel_serial_probe()
2910 ret = -ENODEV; in atmel_serial_probe()
2916 ret = -EBUSY; in atmel_serial_probe()
2921 atmel_port->backup_imr = 0; in atmel_serial_probe()
2922 atmel_port->uart.line = ret; in atmel_serial_probe()
2923 atmel_port->uart.has_sysrq = IS_ENABLED(CONFIG_SERIAL_ATMEL_CONSOLE); in atmel_serial_probe()
2926 atomic_set(&atmel_port->tasklet_shutdown, 0); in atmel_serial_probe()
2927 spin_lock_init(&atmel_port->lock_suspended); in atmel_serial_probe()
2929 atmel_port->clk = devm_clk_get(&pdev->dev, "usart"); in atmel_serial_probe()
2930 if (IS_ERR(atmel_port->clk)) { in atmel_serial_probe()
2931 ret = PTR_ERR(atmel_port->clk); in atmel_serial_probe()
2934 ret = clk_prepare_enable(atmel_port->clk); in atmel_serial_probe()
2938 atmel_port->gclk = devm_clk_get_optional(&pdev->dev, "gclk"); in atmel_serial_probe()
2939 if (IS_ERR(atmel_port->gclk)) { in atmel_serial_probe()
2940 ret = PTR_ERR(atmel_port->gclk); in atmel_serial_probe()
2948 atmel_port->gpios = mctrl_gpio_init(&atmel_port->uart, 0); in atmel_serial_probe()
2949 if (IS_ERR(atmel_port->gpios)) { in atmel_serial_probe()
2950 ret = PTR_ERR(atmel_port->gpios); in atmel_serial_probe()
2954 if (!atmel_use_pdc_rx(&atmel_port->uart)) { in atmel_serial_probe()
2955 ret = -ENOMEM; in atmel_serial_probe()
2961 atmel_port->rx_ring.buf = data; in atmel_serial_probe()
2964 rs485_enabled = atmel_port->uart.rs485.flags & SER_RS485_ENABLED; in atmel_serial_probe()
2966 ret = uart_add_one_port(&atmel_uart, &atmel_port->uart); in atmel_serial_probe()
2970 device_init_wakeup(&pdev->dev, 1); in atmel_serial_probe()
2974 atmel_uart_writel(&atmel_port->uart, ATMEL_US_MR, in atmel_serial_probe()
2976 atmel_uart_writel(&atmel_port->uart, ATMEL_US_CR, in atmel_serial_probe()
2983 atmel_get_ip_name(&atmel_port->uart); in atmel_serial_probe()
2989 clk_disable_unprepare(atmel_port->clk); in atmel_serial_probe()
2994 kfree(atmel_port->rx_ring.buf); in atmel_serial_probe()
2995 atmel_port->rx_ring.buf = NULL; in atmel_serial_probe()
2997 clk_disable_unprepare(atmel_port->clk); in atmel_serial_probe()
2998 clear_bit(atmel_port->uart.line, atmel_ports_in_use); in atmel_serial_probe()
3017 tasklet_kill(&atmel_port->tasklet_rx); in atmel_serial_remove()
3018 tasklet_kill(&atmel_port->tasklet_tx); in atmel_serial_remove()
3020 device_init_wakeup(&pdev->dev, 0); in atmel_serial_remove()
3024 kfree(atmel_port->rx_ring.buf); in atmel_serial_remove()
3028 clear_bit(port->line, atmel_ports_in_use); in atmel_serial_remove()
3030 pdev->dev.of_node = NULL; in atmel_serial_remove()