Lines Matching +full:rs485 +full:- +full:rts +full:- +full:active +full:- +full:low
1 // SPDX-License-Identifier: GPL-2.0
3 * 8250-core based driver for the OMAP internal UART
5 * based on omap-serial.c, Copyright (C) 2010 Texas Instruments.
29 #include <linux/dma-mapping.h>
141 atomic_t active; member
174 return readl(priv->membase + (reg << OMAP_UART_REGSHIFT)); in uart_read()
184 struct omap8250_priv *priv = up->port.private_data; in __omap8250_set_mctrl()
189 if (!mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS)) { in __omap8250_set_mctrl()
191 * Turn off autoRTS if RTS is lowered and restore autoRTS in __omap8250_set_mctrl()
192 * setting if RTS is raised in __omap8250_set_mctrl()
196 if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS)) in __omap8250_set_mctrl()
197 priv->efr |= UART_EFR_RTS; in __omap8250_set_mctrl()
199 priv->efr &= ~UART_EFR_RTS; in __omap8250_set_mctrl()
200 serial_out(up, UART_EFR, priv->efr); in __omap8250_set_mctrl()
209 err = pm_runtime_resume_and_get(port->dev); in omap8250_set_mctrl()
215 pm_runtime_mark_last_busy(port->dev); in omap8250_set_mctrl()
216 pm_runtime_put_autosuspend(port->dev); in omap8250_set_mctrl()
231 serial_out(up, UART_OMAP_MDR1, priv->mdr1); in omap_8250_mdr1_errataset()
233 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | in omap_8250_mdr1_errataset()
240 unsigned int uartclk = port->uartclk; in omap_8250_get_divisor()
247 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) { in omap_8250_get_divisor()
248 priv->quot = port->custom_divisor & UART_DIV_MAX; in omap_8250_get_divisor()
254 if (port->custom_divisor & (1 << 16)) in omap_8250_get_divisor()
255 priv->mdr1 = UART_OMAP_MDR1_13X_MODE; in omap_8250_get_divisor()
257 priv->mdr1 = UART_OMAP_MDR1_16X_MODE; in omap_8250_get_divisor()
268 abs_d13 = abs(baud - uartclk / 13 / div_13); in omap_8250_get_divisor()
269 abs_d16 = abs(baud - uartclk / 16 / div_16); in omap_8250_get_divisor()
272 priv->mdr1 = UART_OMAP_MDR1_16X_MODE; in omap_8250_get_divisor()
273 priv->quot = div_16; in omap_8250_get_divisor()
275 priv->mdr1 = UART_OMAP_MDR1_13X_MODE; in omap_8250_get_divisor()
276 priv->quot = div_13; in omap_8250_get_divisor()
286 if (old_scr == priv->scr) in omap8250_update_scr()
294 if (priv->scr & OMAP_UART_SCR_DMAMODE_MASK) in omap8250_update_scr()
296 priv->scr & ~OMAP_UART_SCR_DMAMODE_MASK); in omap8250_update_scr()
297 serial_out(up, UART_OMAP_SCR, priv->scr); in omap8250_update_scr()
303 if (priv->habit & UART_ERRATA_i202_MDR1_ACCESS) in omap8250_update_mdr1()
306 serial_out(up, UART_OMAP_MDR1, priv->mdr1); in omap8250_update_mdr1()
311 struct omap8250_priv *priv = up->port.private_data; in omap8250_restore_regs()
312 struct uart_8250_dma *dma = up->dma; in omap8250_restore_regs()
316 lockdep_assert_held_once(&up->port.lock); in omap8250_restore_regs()
318 if (dma && dma->tx_running) { in omap8250_restore_regs()
321 * we have a TX-DMA operation in progress then it has been in omap8250_restore_regs()
325 priv->delayed_restore = 1; in omap8250_restore_regs()
334 serial_out(up, UART_FCR, up->fcr); in omap8250_restore_regs()
343 TRIGGER_TLR_MASK(priv->tx_trigger) << UART_TI752_TLR_TX | in omap8250_restore_regs()
344 TRIGGER_TLR_MASK(priv->rx_trigger) << UART_TI752_TLR_RX); in omap8250_restore_regs()
351 serial_out(up, UART_IER, up->ier); in omap8250_restore_regs()
354 serial_dl_write(up, priv->quot); in omap8250_restore_regs()
356 serial_out(up, UART_EFR, priv->efr); in omap8250_restore_regs()
360 serial_out(up, UART_XON1, priv->xon); in omap8250_restore_regs()
361 serial_out(up, UART_XOFF1, priv->xoff); in omap8250_restore_regs()
363 serial_out(up, UART_LCR, up->lcr); in omap8250_restore_regs()
367 __omap8250_set_mctrl(&up->port, up->port.mctrl); in omap8250_restore_regs()
369 serial_out(up, UART_OMAP_MDR3, priv->mdr3); in omap8250_restore_regs()
371 if (up->port.rs485.flags & SER_RS485_ENABLED && in omap8250_restore_regs()
372 up->port.rs485_config == serial8250_em485_config) in omap8250_restore_regs()
385 struct omap8250_priv *priv = up->port.private_data; in omap_8250_set_termios()
389 cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag)); in omap_8250_set_termios()
391 if (termios->c_cflag & CSTOPB) in omap_8250_set_termios()
393 if (termios->c_cflag & PARENB) in omap_8250_set_termios()
395 if (!(termios->c_cflag & PARODD)) in omap_8250_set_termios()
397 if (termios->c_cflag & CMSPAR) in omap_8250_set_termios()
404 port->uartclk / 16 / UART_DIV_MAX, in omap_8250_set_termios()
405 port->uartclk / 13); in omap_8250_set_termios()
412 pm_runtime_get_sync(port->dev); in omap_8250_set_termios()
416 * Update the per-port timeout. in omap_8250_set_termios()
418 uart_update_timeout(port, termios->c_cflag, baud); in omap_8250_set_termios()
420 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; in omap_8250_set_termios()
421 if (termios->c_iflag & INPCK) in omap_8250_set_termios()
422 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; in omap_8250_set_termios()
423 if (termios->c_iflag & (IGNBRK | PARMRK)) in omap_8250_set_termios()
424 up->port.read_status_mask |= UART_LSR_BI; in omap_8250_set_termios()
429 up->port.ignore_status_mask = 0; in omap_8250_set_termios()
430 if (termios->c_iflag & IGNPAR) in omap_8250_set_termios()
431 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; in omap_8250_set_termios()
432 if (termios->c_iflag & IGNBRK) { in omap_8250_set_termios()
433 up->port.ignore_status_mask |= UART_LSR_BI; in omap_8250_set_termios()
438 if (termios->c_iflag & IGNPAR) in omap_8250_set_termios()
439 up->port.ignore_status_mask |= UART_LSR_OE; in omap_8250_set_termios()
445 if ((termios->c_cflag & CREAD) == 0) in omap_8250_set_termios()
446 up->port.ignore_status_mask |= UART_LSR_DR; in omap_8250_set_termios()
451 up->ier &= ~UART_IER_MSI; in omap_8250_set_termios()
452 if (UART_ENABLE_MS(&up->port, termios->c_cflag)) in omap_8250_set_termios()
453 up->ier |= UART_IER_MSI; in omap_8250_set_termios()
455 up->lcr = cval; in omap_8250_set_termios()
461 * - RX_TRIGGER amount of bytes in the FIFO will cause an interrupt. in omap_8250_set_termios()
462 * - less than RX_TRIGGER number of bytes will also cause an interrupt in omap_8250_set_termios()
464 * - Once THRE is enabled, the interrupt will be fired once the FIFO is in omap_8250_set_termios()
465 * empty - the trigger level is ignored here. in omap_8250_set_termios()
468 * - UART will assert the TX DMA line once there is room for TX_TRIGGER in omap_8250_set_termios()
471 * - UART will assert the RX DMA line once there are RX_TRIGGER bytes in in omap_8250_set_termios()
475 up->fcr = UART_FCR_ENABLE_FIFO; in omap_8250_set_termios()
476 up->fcr |= TRIGGER_FCR_MASK(priv->tx_trigger) << OMAP_UART_FCR_TX_TRIG; in omap_8250_set_termios()
477 up->fcr |= TRIGGER_FCR_MASK(priv->rx_trigger) << OMAP_UART_FCR_RX_TRIG; in omap_8250_set_termios()
479 priv->scr = OMAP_UART_SCR_RX_TRIG_GRANU1_MASK | OMAP_UART_SCR_TX_EMPTY | in omap_8250_set_termios()
482 if (up->dma) in omap_8250_set_termios()
483 priv->scr |= OMAP_UART_SCR_DMAMODE_1 | in omap_8250_set_termios()
486 priv->xon = termios->c_cc[VSTART]; in omap_8250_set_termios()
487 priv->xoff = termios->c_cc[VSTOP]; in omap_8250_set_termios()
489 priv->efr = 0; in omap_8250_set_termios()
490 up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF); in omap_8250_set_termios()
492 if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW && in omap_8250_set_termios()
493 !mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS) && in omap_8250_set_termios()
494 !mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_CTS)) { in omap_8250_set_termios()
495 /* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */ in omap_8250_set_termios()
496 up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS; in omap_8250_set_termios()
497 priv->efr |= UART_EFR_CTS; in omap_8250_set_termios()
498 } else if (up->port.flags & UPF_SOFT_FLOW) { in omap_8250_set_termios()
509 if (termios->c_iflag & IXOFF) { in omap_8250_set_termios()
510 up->port.status |= UPSTAT_AUTOXOFF; in omap_8250_set_termios()
511 priv->efr |= OMAP_UART_SW_TX; in omap_8250_set_termios()
516 uart_port_unlock_irq(&up->port); in omap_8250_set_termios()
517 pm_runtime_mark_last_busy(port->dev); in omap_8250_set_termios()
518 pm_runtime_put_autosuspend(port->dev); in omap_8250_set_termios()
521 priv->calc_latency = USEC_PER_SEC * 64 * 8 / baud; in omap_8250_set_termios()
522 priv->latency = priv->calc_latency; in omap_8250_set_termios()
524 schedule_work(&priv->qos_work); in omap_8250_set_termios()
538 pm_runtime_get_sync(port->dev); in omap_8250_pm()
555 pm_runtime_mark_last_busy(port->dev); in omap_8250_pm()
556 pm_runtime_put_autosuspend(port->dev); in omap_8250_pm()
590 dev_warn(up->port.dev, in omap_serial_fill_features_erratas()
601 priv->habit |= UART_ERRATA_i202_MDR1_ACCESS; in omap_serial_fill_features_erratas()
604 priv->habit |= UART_ERRATA_i202_MDR1_ACCESS | in omap_serial_fill_features_erratas()
608 priv->habit |= UART_ERRATA_i202_MDR1_ACCESS | in omap_serial_fill_features_erratas()
621 priv->habit &= ~UART_HAS_RHR_IT_DIS; in omap_serial_fill_features_erratas()
629 cpu_latency_qos_update_request(&priv->pm_qos_request, priv->latency); in omap8250_uart_qos_work()
639 struct uart_8250_port *up = serial8250_get_port(priv->line); in omap8250_irq()
640 struct uart_port *port = &up->port; in omap8250_irq()
644 pm_runtime_get_noresume(port->dev); in omap8250_irq()
646 /* Shallow idle state wake-up to an IO interrupt? */ in omap8250_irq()
647 if (atomic_add_unless(&priv->active, 1, 1)) { in omap8250_irq()
648 priv->latency = priv->calc_latency; in omap8250_irq()
649 schedule_work(&priv->qos_work); in omap8250_irq()
653 if (up->dma) { in omap8250_irq()
655 pm_runtime_mark_last_busy(port->dev); in omap8250_irq()
656 pm_runtime_put(port->dev); in omap8250_irq()
670 if (priv->habit & UART_RX_TIMEOUT_QUIRK && in omap8250_irq()
677 if ((lsr & UART_LSR_OE) && up->overrun_backoff_time_ms > 0) { in omap8250_irq()
682 up->ier = port->serial_in(port, UART_IER); in omap8250_irq()
683 if (up->ier & (UART_IER_RLSI | UART_IER_RDI)) { in omap8250_irq()
684 port->ops->stop_rx(port); in omap8250_irq()
689 cancel_delayed_work(&up->overrun_backoff); in omap8250_irq()
693 delay = msecs_to_jiffies(up->overrun_backoff_time_ms); in omap8250_irq()
694 schedule_delayed_work(&up->overrun_backoff, delay); in omap8250_irq()
697 pm_runtime_mark_last_busy(port->dev); in omap8250_irq()
698 pm_runtime_put(port->dev); in omap8250_irq()
706 struct omap8250_priv *priv = port->private_data; in omap_8250_startup()
707 struct uart_8250_dma *dma = &priv->omap8250_dma; in omap_8250_startup()
710 if (priv->wakeirq) { in omap_8250_startup()
711 ret = dev_pm_set_dedicated_wake_irq(port->dev, priv->wakeirq); in omap_8250_startup()
716 pm_runtime_get_sync(port->dev); in omap_8250_startup()
722 up->lsr_saved_flags = 0; in omap_8250_startup()
723 up->msr_saved_flags = 0; in omap_8250_startup()
726 if (dma->fn && !uart_console(port)) { in omap_8250_startup()
727 up->dma = &priv->omap8250_dma; in omap_8250_startup()
730 dev_warn_ratelimited(port->dev, in omap_8250_startup()
732 up->dma = NULL; in omap_8250_startup()
735 up->dma = NULL; in omap_8250_startup()
740 up->ier = UART_IER_RLSI | UART_IER_RDI; in omap_8250_startup()
741 serial_out(up, UART_IER, up->ier); in omap_8250_startup()
745 up->capabilities |= UART_CAP_RPM; in omap_8250_startup()
749 priv->wer = OMAP_UART_WER_MOD_WKUP; in omap_8250_startup()
750 if (priv->habit & OMAP_UART_WER_HAS_TX_WAKEUP) in omap_8250_startup()
751 priv->wer |= OMAP_UART_TX_WAKEUP_EN; in omap_8250_startup()
752 serial_out(up, UART_OMAP_WER, priv->wer); in omap_8250_startup()
754 if (up->dma && !(priv->habit & UART_HAS_EFR2)) { in omap_8250_startup()
756 up->dma->rx_dma(up); in omap_8250_startup()
760 enable_irq(up->port.irq); in omap_8250_startup()
762 pm_runtime_mark_last_busy(port->dev); in omap_8250_startup()
763 pm_runtime_put_autosuspend(port->dev); in omap_8250_startup()
770 struct omap8250_priv *priv = port->private_data; in omap_8250_shutdown()
772 flush_work(&priv->qos_work); in omap_8250_shutdown()
773 if (up->dma) in omap_8250_shutdown()
776 pm_runtime_get_sync(port->dev); in omap_8250_shutdown()
779 if (priv->habit & UART_HAS_EFR2) in omap_8250_shutdown()
784 up->ier = 0; in omap_8250_shutdown()
787 disable_irq_nosync(up->port.irq); in omap_8250_shutdown()
788 dev_pm_clear_wake_irq(port->dev); in omap_8250_shutdown()
791 up->dma = NULL; in omap_8250_shutdown()
796 if (up->lcr & UART_LCR_SBC) in omap_8250_shutdown()
797 serial_out(up, UART_LCR, up->lcr & ~UART_LCR_SBC); in omap_8250_shutdown()
800 pm_runtime_mark_last_busy(port->dev); in omap_8250_shutdown()
801 pm_runtime_put_autosuspend(port->dev); in omap_8250_shutdown()
806 struct omap8250_priv *priv = port->private_data; in omap_8250_throttle()
809 pm_runtime_get_sync(port->dev); in omap_8250_throttle()
812 port->ops->stop_rx(port); in omap_8250_throttle()
813 priv->throttled = true; in omap_8250_throttle()
816 pm_runtime_mark_last_busy(port->dev); in omap_8250_throttle()
817 pm_runtime_put_autosuspend(port->dev); in omap_8250_throttle()
822 struct omap8250_priv *priv = port->private_data; in omap_8250_unthrottle()
826 pm_runtime_get_sync(port->dev); in omap_8250_unthrottle()
830 priv->throttled = false; in omap_8250_unthrottle()
831 if (up->dma) in omap_8250_unthrottle()
832 up->dma->rx_dma(up); in omap_8250_unthrottle()
833 up->ier |= UART_IER_RLSI | UART_IER_RDI; in omap_8250_unthrottle()
834 port->read_status_mask |= UART_LSR_DR; in omap_8250_unthrottle()
835 serial_out(up, UART_IER, up->ier); in omap_8250_unthrottle()
838 pm_runtime_mark_last_busy(port->dev); in omap_8250_unthrottle()
839 pm_runtime_put_autosuspend(port->dev); in omap_8250_unthrottle()
844 struct serial_rs485 *rs485) in omap8250_rs485_config() argument
846 struct omap8250_priv *priv = port->private_data; in omap8250_rs485_config()
861 if (priv->quot) { in omap8250_rs485_config()
862 if (priv->mdr1 == UART_OMAP_MDR1_16X_MODE) in omap8250_rs485_config()
863 baud = port->uartclk / (16 * priv->quot); in omap8250_rs485_config()
865 baud = port->uartclk / (13 * priv->quot); in omap8250_rs485_config()
872 * Fall back to RS485 software emulation if the UART is missing in omap8250_rs485_config()
874 * (indicates that RTS is unavailable due to a pinmux conflict) in omap8250_rs485_config()
877 if (!(priv->habit & UART_HAS_NATIVE_RS485) || in omap8250_rs485_config()
878 mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS) || in omap8250_rs485_config()
879 rs485->delay_rts_after_send > fixed_delay_rts_after_send || in omap8250_rs485_config()
880 rs485->delay_rts_before_send > fixed_delay_rts_before_send) { in omap8250_rs485_config()
881 priv->mdr3 &= ~UART_OMAP_MDR3_DIR_EN; in omap8250_rs485_config()
882 serial_out(up, UART_OMAP_MDR3, priv->mdr3); in omap8250_rs485_config()
884 port->rs485_config = serial8250_em485_config; in omap8250_rs485_config()
885 return serial8250_em485_config(port, termios, rs485); in omap8250_rs485_config()
888 rs485->delay_rts_after_send = fixed_delay_rts_after_send; in omap8250_rs485_config()
889 rs485->delay_rts_before_send = fixed_delay_rts_before_send; in omap8250_rs485_config()
891 if (rs485->flags & SER_RS485_ENABLED) in omap8250_rs485_config()
892 priv->mdr3 |= UART_OMAP_MDR3_DIR_EN; in omap8250_rs485_config()
894 priv->mdr3 &= ~UART_OMAP_MDR3_DIR_EN; in omap8250_rs485_config()
897 * Retain same polarity semantics as RS485 software emulation, in omap8250_rs485_config()
898 * i.e. SER_RS485_RTS_ON_SEND means driving RTS low on send. in omap8250_rs485_config()
900 if (rs485->flags & SER_RS485_RTS_ON_SEND) in omap8250_rs485_config()
901 priv->mdr3 &= ~UART_OMAP_MDR3_DIR_POL; in omap8250_rs485_config()
903 priv->mdr3 |= UART_OMAP_MDR3_DIR_POL; in omap8250_rs485_config()
905 serial_out(up, UART_OMAP_MDR3, priv->mdr3); in omap8250_rs485_config()
913 /* Must be called while priv->rx_dma_lock is held */
916 struct uart_8250_dma *dma = p->dma; in __dma_rx_do_complete()
917 struct tty_port *tty_port = &p->port.state->port; in __dma_rx_do_complete()
918 struct omap8250_priv *priv = p->port.private_data; in __dma_rx_do_complete()
919 struct dma_chan *rxchan = dma->rxchan; in __dma_rx_do_complete()
926 if (!dma->rx_running) in __dma_rx_do_complete()
929 cookie = dma->rx_cookie; in __dma_rx_do_complete()
930 dma->rx_running = 0; in __dma_rx_do_complete()
932 /* Re-enable RX FIFO interrupt now that transfer is complete */ in __dma_rx_do_complete()
933 if (priv->habit & UART_HAS_RHR_IT_DIS) { in __dma_rx_do_complete()
941 count = dma->rx_size - state.residue + state.in_flight_bytes; in __dma_rx_do_complete()
942 if (count < dma->rx_size) { in __dma_rx_do_complete()
953 poll_count--) in __dma_rx_do_complete()
956 if (poll_count == -1) in __dma_rx_do_complete()
957 dev_err(p->port.dev, "teardown incomplete\n"); in __dma_rx_do_complete()
962 ret = tty_insert_flip_string(tty_port, dma->rx_buf, count); in __dma_rx_do_complete()
964 p->port.icount.rx += ret; in __dma_rx_do_complete()
965 p->port.icount.buf_overrun += count - ret; in __dma_rx_do_complete()
974 struct omap8250_priv *priv = p->port.private_data; in __dma_rx_complete()
975 struct uart_8250_dma *dma = p->dma; in __dma_rx_complete()
980 uart_port_lock_irqsave(&p->port, &flags); in __dma_rx_complete()
987 if (dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state) != in __dma_rx_complete()
989 uart_port_unlock_irqrestore(&p->port, flags); in __dma_rx_complete()
993 if (!priv->throttled) { in __dma_rx_complete()
994 p->ier |= UART_IER_RLSI | UART_IER_RDI; in __dma_rx_complete()
995 serial_out(p, UART_IER, p->ier); in __dma_rx_complete()
996 if (!(priv->habit & UART_HAS_EFR2)) in __dma_rx_complete()
1000 uart_port_unlock_irqrestore(&p->port, flags); in __dma_rx_complete()
1005 struct omap8250_priv *priv = p->port.private_data; in omap_8250_rx_dma_flush()
1006 struct uart_8250_dma *dma = p->dma; in omap_8250_rx_dma_flush()
1011 spin_lock_irqsave(&priv->rx_dma_lock, flags); in omap_8250_rx_dma_flush()
1013 if (!dma->rx_running) { in omap_8250_rx_dma_flush()
1014 spin_unlock_irqrestore(&priv->rx_dma_lock, flags); in omap_8250_rx_dma_flush()
1018 ret = dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); in omap_8250_rx_dma_flush()
1020 ret = dmaengine_pause(dma->rxchan); in omap_8250_rx_dma_flush()
1022 priv->rx_dma_broken = true; in omap_8250_rx_dma_flush()
1025 spin_unlock_irqrestore(&priv->rx_dma_lock, flags); in omap_8250_rx_dma_flush()
1030 struct omap8250_priv *priv = p->port.private_data; in omap_8250_rx_dma()
1031 struct uart_8250_dma *dma = p->dma; in omap_8250_rx_dma()
1038 lockdep_assert_held_once(&p->port.lock); in omap_8250_rx_dma()
1040 if (priv->rx_dma_broken) in omap_8250_rx_dma()
1041 return -EINVAL; in omap_8250_rx_dma()
1043 spin_lock_irqsave(&priv->rx_dma_lock, flags); in omap_8250_rx_dma()
1045 if (dma->rx_running) { in omap_8250_rx_dma()
1048 state = dmaengine_tx_status(dma->rxchan, dma->rx_cookie, NULL); in omap_8250_rx_dma()
1054 p->ier &= ~(UART_IER_RLSI | UART_IER_RDI); in omap_8250_rx_dma()
1055 serial_out(p, UART_IER, p->ier); in omap_8250_rx_dma()
1060 desc = dmaengine_prep_slave_single(dma->rxchan, dma->rx_addr, in omap_8250_rx_dma()
1061 dma->rx_size, DMA_DEV_TO_MEM, in omap_8250_rx_dma()
1064 err = -EBUSY; in omap_8250_rx_dma()
1068 dma->rx_running = 1; in omap_8250_rx_dma()
1069 desc->callback = __dma_rx_complete; in omap_8250_rx_dma()
1070 desc->callback_param = p; in omap_8250_rx_dma()
1072 dma->rx_cookie = dmaengine_submit(desc); in omap_8250_rx_dma()
1079 if (priv->habit & UART_HAS_RHR_IT_DIS) { in omap_8250_rx_dma()
1085 dma_async_issue_pending(dma->rxchan); in omap_8250_rx_dma()
1087 spin_unlock_irqrestore(&priv->rx_dma_lock, flags); in omap_8250_rx_dma()
1096 struct uart_8250_dma *dma = p->dma; in omap_8250_dma_tx_complete()
1097 struct circ_buf *xmit = &p->port.state->xmit; in omap_8250_dma_tx_complete()
1100 struct omap8250_priv *priv = p->port.private_data; in omap_8250_dma_tx_complete()
1102 dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr, in omap_8250_dma_tx_complete()
1105 uart_port_lock_irqsave(&p->port, &flags); in omap_8250_dma_tx_complete()
1107 dma->tx_running = 0; in omap_8250_dma_tx_complete()
1109 uart_xmit_advance(&p->port, dma->tx_size); in omap_8250_dma_tx_complete()
1111 if (priv->delayed_restore) { in omap_8250_dma_tx_complete()
1112 priv->delayed_restore = 0; in omap_8250_dma_tx_complete()
1117 uart_write_wakeup(&p->port); in omap_8250_dma_tx_complete()
1119 if (!uart_circ_empty(xmit) && !uart_tx_stopped(&p->port)) { in omap_8250_dma_tx_complete()
1125 } else if (p->capabilities & UART_CAP_RPM) { in omap_8250_dma_tx_complete()
1130 dma->tx_err = 1; in omap_8250_dma_tx_complete()
1134 uart_port_unlock_irqrestore(&p->port, flags); in omap_8250_dma_tx_complete()
1139 struct uart_8250_dma *dma = p->dma; in omap_8250_tx_dma()
1140 struct omap8250_priv *priv = p->port.private_data; in omap_8250_tx_dma()
1141 struct circ_buf *xmit = &p->port.state->xmit; in omap_8250_tx_dma()
1146 if (dma->tx_running) in omap_8250_tx_dma()
1148 if (uart_tx_stopped(&p->port) || uart_circ_empty(xmit)) { in omap_8250_tx_dma()
1155 if (dma->tx_err || p->capabilities & UART_CAP_RPM) { in omap_8250_tx_dma()
1156 ret = -EBUSY; in omap_8250_tx_dma()
1163 dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); in omap_8250_tx_dma()
1164 if (priv->habit & OMAP_DMA_TX_KICK) { in omap_8250_tx_dma()
1183 if (tx_lvl == p->tx_loadsz) { in omap_8250_tx_dma()
1184 ret = -EBUSY; in omap_8250_tx_dma()
1187 if (dma->tx_size < 4) { in omap_8250_tx_dma()
1188 ret = -EINVAL; in omap_8250_tx_dma()
1194 desc = dmaengine_prep_slave_single(dma->txchan, in omap_8250_tx_dma()
1195 dma->tx_addr + xmit->tail + skip_byte, in omap_8250_tx_dma()
1196 dma->tx_size - skip_byte, DMA_MEM_TO_DEV, in omap_8250_tx_dma()
1199 ret = -EBUSY; in omap_8250_tx_dma()
1203 dma->tx_running = 1; in omap_8250_tx_dma()
1205 desc->callback = omap_8250_dma_tx_complete; in omap_8250_tx_dma()
1206 desc->callback_param = p; in omap_8250_tx_dma()
1208 dma->tx_cookie = dmaengine_submit(desc); in omap_8250_tx_dma()
1210 dma_sync_single_for_device(dma->txchan->device->dev, dma->tx_addr, in omap_8250_tx_dma()
1213 dma_async_issue_pending(dma->txchan); in omap_8250_tx_dma()
1214 if (dma->tx_err) in omap_8250_tx_dma()
1215 dma->tx_err = 0; in omap_8250_tx_dma()
1219 serial_out(p, UART_TX, xmit->buf[xmit->tail]); in omap_8250_tx_dma()
1222 dma->tx_err = 1; in omap_8250_tx_dma()
1255 lockdep_assert_held_once(&up->port.lock); in am654_8250_handle_rx_dma()
1261 (up->ier & UART_IER_RDI)) { in am654_8250_handle_rx_dma()
1268 * periodic timeouts, re-enable interrupts. in am654_8250_handle_rx_dma()
1270 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); in am654_8250_handle_rx_dma()
1271 serial_out(up, UART_IER, up->ier); in am654_8250_handle_rx_dma()
1275 up->ier |= UART_IER_RLSI | UART_IER_RDI; in am654_8250_handle_rx_dma()
1276 serial_out(up, UART_IER, up->ier); in am654_8250_handle_rx_dma()
1283 * use the default routine in the non-DMA case and this one for with DMA.
1288 struct omap8250_priv *priv = up->port.private_data; in omap_8250_dma_handle_irq()
1302 if (priv->habit & UART_HAS_EFR2) in omap_8250_dma_handle_irq()
1309 if (status & UART_LSR_THRE && up->dma->tx_err) { in omap_8250_dma_handle_irq()
1310 if (uart_tx_stopped(&up->port) || in omap_8250_dma_handle_irq()
1311 uart_circ_empty(&up->port.state->xmit)) { in omap_8250_dma_handle_irq()
1312 up->dma->tx_err = 0; in omap_8250_dma_handle_irq()
1338 return -EINVAL; in omap_8250_rx_dma()
1378 { .compatible = "ti,am654-uart", .data = &am654_platdata, },
1379 { .compatible = "ti,omap2-uart" },
1380 { .compatible = "ti,omap3-uart" },
1381 { .compatible = "ti,omap4-uart", .data = &omap4_platdata, },
1382 { .compatible = "ti,am3352-uart", .data = &am33xx_platdata, },
1383 { .compatible = "ti,am4372-uart", .data = &am33xx_platdata, },
1384 { .compatible = "ti,dra742-uart", .data = &omap4_platdata, },
1391 struct device_node *np = pdev->dev.of_node; in omap8250_probe()
1405 dev_err(&pdev->dev, "missing registers\n"); in omap8250_probe()
1406 return -EINVAL; in omap8250_probe()
1409 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); in omap8250_probe()
1411 return -ENOMEM; in omap8250_probe()
1413 membase = devm_ioremap(&pdev->dev, regs->start, in omap8250_probe()
1416 return -ENODEV; in omap8250_probe()
1419 up.port.dev = &pdev->dev; in omap8250_probe()
1420 up.port.mapbase = regs->start; in omap8250_probe()
1458 /* same rs485_supported for software emulation and native RS485 */ in omap8250_probe()
1466 dev_err(&pdev->dev, "failed to get alias\n"); in omap8250_probe()
1471 if (of_property_read_u32(np, "clock-frequency", &up.port.uartclk)) { in omap8250_probe()
1474 clk = devm_clk_get(&pdev->dev, NULL); in omap8250_probe()
1476 if (PTR_ERR(clk) == -EPROBE_DEFER) in omap8250_probe()
1477 return -EPROBE_DEFER; in omap8250_probe()
1483 if (of_property_read_u32(np, "overrun-throttle-ms", in omap8250_probe()
1487 pdata = of_device_get_match_data(&pdev->dev); in omap8250_probe()
1489 priv->habit |= pdata->habit; in omap8250_probe()
1493 dev_warn(&pdev->dev, in omap8250_probe()
1498 priv->membase = membase; in omap8250_probe()
1499 priv->line = -ENODEV; in omap8250_probe()
1500 priv->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; in omap8250_probe()
1501 priv->calc_latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; in omap8250_probe()
1502 cpu_latency_qos_add_request(&priv->pm_qos_request, priv->latency); in omap8250_probe()
1503 INIT_WORK(&priv->qos_work, omap8250_uart_qos_work); in omap8250_probe()
1505 spin_lock_init(&priv->rx_dma_lock); in omap8250_probe()
1509 device_init_wakeup(&pdev->dev, true); in omap8250_probe()
1510 pm_runtime_enable(&pdev->dev); in omap8250_probe()
1511 pm_runtime_use_autosuspend(&pdev->dev); in omap8250_probe()
1516 * prevent an unsafe default policy with lossy characters on wake-up. in omap8250_probe()
1520 if (!of_get_available_child_count(pdev->dev.of_node)) in omap8250_probe()
1521 pm_runtime_set_autosuspend_delay(&pdev->dev, -1); in omap8250_probe()
1523 pm_runtime_get_sync(&pdev->dev); in omap8250_probe()
1527 priv->rx_trigger = RX_TRIGGER; in omap8250_probe()
1528 priv->tx_trigger = TX_TRIGGER; in omap8250_probe()
1538 ret = of_property_count_strings(np, "dma-names"); in omap8250_probe()
1541 struct uart_8250_dma *dma = &priv->omap8250_dma; in omap8250_probe()
1543 dma->fn = the_no_dma_filter_fn; in omap8250_probe()
1544 dma->tx_dma = omap_8250_tx_dma; in omap8250_probe()
1545 dma->rx_dma = omap_8250_rx_dma; in omap8250_probe()
1547 dma_params = pdata->dma_params; in omap8250_probe()
1550 dma->rx_size = dma_params->rx_size; in omap8250_probe()
1551 dma->rxconf.src_maxburst = dma_params->rx_trigger; in omap8250_probe()
1552 dma->txconf.dst_maxburst = dma_params->tx_trigger; in omap8250_probe()
1553 priv->rx_trigger = dma_params->rx_trigger; in omap8250_probe()
1554 priv->tx_trigger = dma_params->tx_trigger; in omap8250_probe()
1556 dma->rx_size = RX_TRIGGER; in omap8250_probe()
1557 dma->rxconf.src_maxburst = RX_TRIGGER; in omap8250_probe()
1558 dma->txconf.dst_maxburst = TX_TRIGGER; in omap8250_probe()
1564 ret = devm_request_irq(&pdev->dev, irq, omap8250_irq, 0, in omap8250_probe()
1565 dev_name(&pdev->dev), priv); in omap8250_probe()
1569 priv->wakeirq = irq_of_parse_and_map(np, 1); in omap8250_probe()
1573 dev_err(&pdev->dev, "unable to register 8250 port\n"); in omap8250_probe()
1576 priv->line = ret; in omap8250_probe()
1577 pm_runtime_mark_last_busy(&pdev->dev); in omap8250_probe()
1578 pm_runtime_put_autosuspend(&pdev->dev); in omap8250_probe()
1581 pm_runtime_dont_use_autosuspend(&pdev->dev); in omap8250_probe()
1582 pm_runtime_put_sync(&pdev->dev); in omap8250_probe()
1583 flush_work(&priv->qos_work); in omap8250_probe()
1584 pm_runtime_disable(&pdev->dev); in omap8250_probe()
1585 cpu_latency_qos_remove_request(&priv->pm_qos_request); in omap8250_probe()
1595 err = pm_runtime_resume_and_get(&pdev->dev); in omap8250_remove()
1597 dev_err(&pdev->dev, "Failed to resume hardware\n"); in omap8250_remove()
1599 up = serial8250_get_port(priv->line); in omap8250_remove()
1600 omap_8250_shutdown(&up->port); in omap8250_remove()
1601 serial8250_unregister_port(priv->line); in omap8250_remove()
1602 priv->line = -ENODEV; in omap8250_remove()
1603 pm_runtime_dont_use_autosuspend(&pdev->dev); in omap8250_remove()
1604 pm_runtime_put_sync(&pdev->dev); in omap8250_remove()
1605 flush_work(&priv->qos_work); in omap8250_remove()
1606 pm_runtime_disable(&pdev->dev); in omap8250_remove()
1607 cpu_latency_qos_remove_request(&priv->pm_qos_request); in omap8250_remove()
1608 device_init_wakeup(&pdev->dev, false); in omap8250_remove()
1617 priv->is_suspending = true; in omap8250_prepare()
1627 priv->is_suspending = false; in omap8250_complete()
1633 struct uart_8250_port *up = serial8250_get_port(priv->line); in omap8250_suspend()
1634 struct generic_pm_domain *genpd = pd_to_genpd(dev->pm_domain); in omap8250_suspend()
1637 serial8250_suspend_port(priv->line); in omap8250_suspend()
1643 priv->wer = 0; in omap8250_suspend()
1644 serial_out(up, UART_OMAP_WER, priv->wer); in omap8250_suspend()
1645 if (uart_console(&up->port)) { in omap8250_suspend()
1650 * The pd shall not be powered-off (no console suspend). in omap8250_suspend()
1654 genpd_flags_console = genpd->flags; in omap8250_suspend()
1655 genpd->flags |= GENPD_FLAG_ALWAYS_ON; in omap8250_suspend()
1658 flush_work(&priv->qos_work); in omap8250_suspend()
1666 struct uart_8250_port *up = serial8250_get_port(priv->line); in omap8250_resume()
1667 struct generic_pm_domain *genpd = pd_to_genpd(dev->pm_domain); in omap8250_resume()
1670 if (uart_console(&up->port) && console_suspend_enabled) { in omap8250_resume()
1676 genpd->flags = genpd_flags_console; in omap8250_resume()
1679 serial8250_resume_port(priv->line); in omap8250_resume()
1704 writel(val, priv->membase + (reg << OMAP_UART_REGSHIFT)); in uart_write()
1738 } while (--timeout && !(syss & OMAP_UART_SYSS_RESETDONE)); in omap8250_soft_reset()
1742 return -ETIMEDOUT; in omap8250_soft_reset()
1753 if (priv->line >= 0) in omap8250_runtime_suspend()
1754 up = serial8250_get_port(priv->line); in omap8250_runtime_suspend()
1756 if (priv->habit & UART_ERRATA_CLOCK_DISABLE) { in omap8250_runtime_suspend()
1767 serial_out(up, UART_OMAP_WER, priv->wer); in omap8250_runtime_suspend()
1771 if (up && up->dma && up->dma->rxchan) in omap8250_runtime_suspend()
1774 priv->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; in omap8250_runtime_suspend()
1775 schedule_work(&priv->qos_work); in omap8250_runtime_suspend()
1776 atomic_set(&priv->active, 0); in omap8250_runtime_suspend()
1787 if (atomic_read(&priv->active)) in omap8250_runtime_resume()
1790 if (priv->line >= 0) in omap8250_runtime_resume()
1791 up = serial8250_get_port(priv->line); in omap8250_runtime_resume()
1794 uart_port_lock_irq(&up->port); in omap8250_runtime_resume()
1796 uart_port_unlock_irq(&up->port); in omap8250_runtime_resume()
1799 if (up && up->dma && up->dma->rxchan && !(priv->habit & UART_HAS_EFR2)) { in omap8250_runtime_resume()
1800 uart_port_lock_irq(&up->port); in omap8250_runtime_resume()
1802 uart_port_unlock_irq(&up->port); in omap8250_runtime_resume()
1805 atomic_set(&priv->active, 1); in omap8250_runtime_resume()
1806 priv->latency = priv->calc_latency; in omap8250_runtime_resume()
1807 schedule_work(&priv->qos_work); in omap8250_runtime_resume()
1830 idx = *omap_str - '0'; in omap8250_console_fixup()