Lines Matching +full:up +full:-
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>
155 static u32 uart_read(struct uart_8250_port *up, u32 reg) in uart_read() argument
157 return readl(up->port.membase + (reg << up->port.regshift)); in uart_read()
166 struct uart_8250_port *up = up_to_u8250p(port); in __omap8250_set_mctrl() local
167 struct omap8250_priv *priv = up->port.private_data; in __omap8250_set_mctrl()
172 if (!mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS)) { in __omap8250_set_mctrl()
177 lcr = serial_in(up, UART_LCR); in __omap8250_set_mctrl()
178 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); in __omap8250_set_mctrl()
179 if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS)) in __omap8250_set_mctrl()
180 priv->efr |= UART_EFR_RTS; in __omap8250_set_mctrl()
182 priv->efr &= ~UART_EFR_RTS; in __omap8250_set_mctrl()
183 serial_out(up, UART_EFR, priv->efr); in __omap8250_set_mctrl()
184 serial_out(up, UART_LCR, lcr); in __omap8250_set_mctrl()
192 err = pm_runtime_resume_and_get(port->dev); in omap8250_set_mctrl()
198 pm_runtime_mark_last_busy(port->dev); in omap8250_set_mctrl()
199 pm_runtime_put_autosuspend(port->dev); in omap8250_set_mctrl()
211 static void omap_8250_mdr1_errataset(struct uart_8250_port *up, in omap_8250_mdr1_errataset() argument
214 serial_out(up, UART_OMAP_MDR1, priv->mdr1); in omap_8250_mdr1_errataset()
216 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT | in omap_8250_mdr1_errataset()
223 unsigned int uartclk = port->uartclk; in omap_8250_get_divisor()
230 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) { in omap_8250_get_divisor()
231 priv->quot = port->custom_divisor & UART_DIV_MAX; in omap_8250_get_divisor()
237 if (port->custom_divisor & (1 << 16)) in omap_8250_get_divisor()
238 priv->mdr1 = UART_OMAP_MDR1_13X_MODE; in omap_8250_get_divisor()
240 priv->mdr1 = UART_OMAP_MDR1_16X_MODE; in omap_8250_get_divisor()
251 abs_d13 = abs(baud - uartclk / 13 / div_13); in omap_8250_get_divisor()
252 abs_d16 = abs(baud - uartclk / 16 / div_16); in omap_8250_get_divisor()
255 priv->mdr1 = UART_OMAP_MDR1_16X_MODE; in omap_8250_get_divisor()
256 priv->quot = div_16; in omap_8250_get_divisor()
258 priv->mdr1 = UART_OMAP_MDR1_13X_MODE; in omap_8250_get_divisor()
259 priv->quot = div_13; in omap_8250_get_divisor()
263 static void omap8250_update_scr(struct uart_8250_port *up, in omap8250_update_scr() argument
268 old_scr = serial_in(up, UART_OMAP_SCR); in omap8250_update_scr()
269 if (old_scr == priv->scr) in omap8250_update_scr()
277 if (priv->scr & OMAP_UART_SCR_DMAMODE_MASK) in omap8250_update_scr()
278 serial_out(up, UART_OMAP_SCR, in omap8250_update_scr()
279 priv->scr & ~OMAP_UART_SCR_DMAMODE_MASK); in omap8250_update_scr()
280 serial_out(up, UART_OMAP_SCR, priv->scr); in omap8250_update_scr()
283 static void omap8250_update_mdr1(struct uart_8250_port *up, in omap8250_update_mdr1() argument
286 if (priv->habit & UART_ERRATA_i202_MDR1_ACCESS) in omap8250_update_mdr1()
287 omap_8250_mdr1_errataset(up, priv); in omap8250_update_mdr1()
289 serial_out(up, UART_OMAP_MDR1, priv->mdr1); in omap8250_update_mdr1()
292 static void omap8250_restore_regs(struct uart_8250_port *up) in omap8250_restore_regs() argument
294 struct omap8250_priv *priv = up->port.private_data; in omap8250_restore_regs()
295 struct uart_8250_dma *dma = up->dma; in omap8250_restore_regs()
296 u8 mcr = serial8250_in_MCR(up); in omap8250_restore_regs()
298 if (dma && dma->tx_running) { in omap8250_restore_regs()
301 * we have a TX-DMA operation in progress then it has been in omap8250_restore_regs()
305 priv->delayed_restore = 1; in omap8250_restore_regs()
309 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); in omap8250_restore_regs()
310 serial_out(up, UART_EFR, UART_EFR_ECB); in omap8250_restore_regs()
312 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); in omap8250_restore_regs()
313 serial8250_out_MCR(up, mcr | UART_MCR_TCRTLR); in omap8250_restore_regs()
314 serial_out(up, UART_FCR, up->fcr); in omap8250_restore_regs()
316 omap8250_update_scr(up, priv); in omap8250_restore_regs()
318 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); in omap8250_restore_regs()
320 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_RESTORE(16) | in omap8250_restore_regs()
322 serial_out(up, UART_TI752_TLR, in omap8250_restore_regs()
323 TRIGGER_TLR_MASK(priv->tx_trigger) << UART_TI752_TLR_TX | in omap8250_restore_regs()
324 TRIGGER_TLR_MASK(priv->rx_trigger) << UART_TI752_TLR_RX); in omap8250_restore_regs()
326 serial_out(up, UART_LCR, 0); in omap8250_restore_regs()
329 serial8250_out_MCR(up, mcr); in omap8250_restore_regs()
331 serial_out(up, UART_IER, up->ier); in omap8250_restore_regs()
333 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); in omap8250_restore_regs()
334 serial_dl_write(up, priv->quot); in omap8250_restore_regs()
336 serial_out(up, UART_EFR, priv->efr); in omap8250_restore_regs()
339 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); in omap8250_restore_regs()
340 serial_out(up, UART_XON1, priv->xon); in omap8250_restore_regs()
341 serial_out(up, UART_XOFF1, priv->xoff); in omap8250_restore_regs()
343 serial_out(up, UART_LCR, up->lcr); in omap8250_restore_regs()
345 omap8250_update_mdr1(up, priv); in omap8250_restore_regs()
347 __omap8250_set_mctrl(&up->port, up->port.mctrl); in omap8250_restore_regs()
349 if (up->port.rs485.flags & SER_RS485_ENABLED) in omap8250_restore_regs()
350 serial8250_em485_stop_tx(up); in omap8250_restore_regs()
361 struct uart_8250_port *up = up_to_u8250p(port); in omap_8250_set_termios() local
362 struct omap8250_priv *priv = up->port.private_data; in omap_8250_set_termios()
366 cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag)); in omap_8250_set_termios()
368 if (termios->c_cflag & CSTOPB) in omap_8250_set_termios()
370 if (termios->c_cflag & PARENB) in omap_8250_set_termios()
372 if (!(termios->c_cflag & PARODD)) in omap_8250_set_termios()
374 if (termios->c_cflag & CMSPAR) in omap_8250_set_termios()
381 port->uartclk / 16 / UART_DIV_MAX, in omap_8250_set_termios()
382 port->uartclk / 13); in omap_8250_set_termios()
389 pm_runtime_get_sync(port->dev); in omap_8250_set_termios()
390 spin_lock_irq(&port->lock); in omap_8250_set_termios()
393 * Update the per-port timeout. in omap_8250_set_termios()
395 uart_update_timeout(port, termios->c_cflag, baud); in omap_8250_set_termios()
397 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; in omap_8250_set_termios()
398 if (termios->c_iflag & INPCK) in omap_8250_set_termios()
399 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; in omap_8250_set_termios()
400 if (termios->c_iflag & (IGNBRK | PARMRK)) in omap_8250_set_termios()
401 up->port.read_status_mask |= UART_LSR_BI; in omap_8250_set_termios()
406 up->port.ignore_status_mask = 0; in omap_8250_set_termios()
407 if (termios->c_iflag & IGNPAR) in omap_8250_set_termios()
408 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; in omap_8250_set_termios()
409 if (termios->c_iflag & IGNBRK) { in omap_8250_set_termios()
410 up->port.ignore_status_mask |= UART_LSR_BI; in omap_8250_set_termios()
415 if (termios->c_iflag & IGNPAR) in omap_8250_set_termios()
416 up->port.ignore_status_mask |= UART_LSR_OE; in omap_8250_set_termios()
422 if ((termios->c_cflag & CREAD) == 0) in omap_8250_set_termios()
423 up->port.ignore_status_mask |= UART_LSR_DR; in omap_8250_set_termios()
428 up->ier &= ~UART_IER_MSI; in omap_8250_set_termios()
429 if (UART_ENABLE_MS(&up->port, termios->c_cflag)) in omap_8250_set_termios()
430 up->ier |= UART_IER_MSI; in omap_8250_set_termios()
432 up->lcr = cval; in omap_8250_set_termios()
433 /* Up to here it was mostly serial8250_do_set_termios() */ in omap_8250_set_termios()
438 * - RX_TRIGGER amount of bytes in the FIFO will cause an interrupt. in omap_8250_set_termios()
439 * - less than RX_TRIGGER number of bytes will also cause an interrupt in omap_8250_set_termios()
441 * - Once THRE is enabled, the interrupt will be fired once the FIFO is in omap_8250_set_termios()
442 * empty - the trigger level is ignored here. in omap_8250_set_termios()
445 * - UART will assert the TX DMA line once there is room for TX_TRIGGER in omap_8250_set_termios()
448 * - UART will assert the RX DMA line once there are RX_TRIGGER bytes in in omap_8250_set_termios()
452 up->fcr = UART_FCR_ENABLE_FIFO; in omap_8250_set_termios()
453 up->fcr |= TRIGGER_FCR_MASK(priv->tx_trigger) << OMAP_UART_FCR_TX_TRIG; in omap_8250_set_termios()
454 up->fcr |= TRIGGER_FCR_MASK(priv->rx_trigger) << OMAP_UART_FCR_RX_TRIG; in omap_8250_set_termios()
456 priv->scr = OMAP_UART_SCR_RX_TRIG_GRANU1_MASK | OMAP_UART_SCR_TX_EMPTY | in omap_8250_set_termios()
459 if (up->dma) in omap_8250_set_termios()
460 priv->scr |= OMAP_UART_SCR_DMAMODE_1 | in omap_8250_set_termios()
463 priv->xon = termios->c_cc[VSTART]; in omap_8250_set_termios()
464 priv->xoff = termios->c_cc[VSTOP]; in omap_8250_set_termios()
466 priv->efr = 0; in omap_8250_set_termios()
467 up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF); in omap_8250_set_termios()
469 if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW && in omap_8250_set_termios()
470 !mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS) && in omap_8250_set_termios()
471 !mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_CTS)) { in omap_8250_set_termios()
473 up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS; in omap_8250_set_termios()
474 priv->efr |= UART_EFR_CTS; in omap_8250_set_termios()
475 } else if (up->port.flags & UPF_SOFT_FLOW) { in omap_8250_set_termios()
486 if (termios->c_iflag & IXOFF) { in omap_8250_set_termios()
487 up->port.status |= UPSTAT_AUTOXOFF; in omap_8250_set_termios()
488 priv->efr |= OMAP_UART_SW_TX; in omap_8250_set_termios()
491 omap8250_restore_regs(up); in omap_8250_set_termios()
493 spin_unlock_irq(&up->port.lock); in omap_8250_set_termios()
494 pm_runtime_mark_last_busy(port->dev); in omap_8250_set_termios()
495 pm_runtime_put_autosuspend(port->dev); in omap_8250_set_termios()
498 priv->calc_latency = USEC_PER_SEC * 64 * 8 / baud; in omap_8250_set_termios()
499 priv->latency = priv->calc_latency; in omap_8250_set_termios()
501 schedule_work(&priv->qos_work); in omap_8250_set_termios()
512 struct uart_8250_port *up = up_to_u8250p(port); in omap_8250_pm() local
515 pm_runtime_get_sync(port->dev); in omap_8250_pm()
516 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); in omap_8250_pm()
517 efr = serial_in(up, UART_EFR); in omap_8250_pm()
518 serial_out(up, UART_EFR, efr | UART_EFR_ECB); in omap_8250_pm()
519 serial_out(up, UART_LCR, 0); in omap_8250_pm()
521 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); in omap_8250_pm()
522 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); in omap_8250_pm()
523 serial_out(up, UART_EFR, efr); in omap_8250_pm()
524 serial_out(up, UART_LCR, 0); in omap_8250_pm()
526 pm_runtime_mark_last_busy(port->dev); in omap_8250_pm()
527 pm_runtime_put_autosuspend(port->dev); in omap_8250_pm()
530 static void omap_serial_fill_features_erratas(struct uart_8250_port *up, in omap_serial_fill_features_erratas() argument
541 mvr = uart_read(up, UART_OMAP_MVER); in omap_serial_fill_features_erratas()
561 dev_warn(up->port.dev, in omap_serial_fill_features_erratas()
572 priv->habit |= UART_ERRATA_i202_MDR1_ACCESS; in omap_serial_fill_features_erratas()
575 priv->habit |= UART_ERRATA_i202_MDR1_ACCESS | in omap_serial_fill_features_erratas()
579 priv->habit |= UART_ERRATA_i202_MDR1_ACCESS | in omap_serial_fill_features_erratas()
592 priv->habit &= ~UART_HAS_RHR_IT_DIS; in omap_serial_fill_features_erratas()
600 cpu_latency_qos_update_request(&priv->pm_qos_request, priv->latency); in omap8250_uart_qos_work()
610 struct omap8250_priv *priv = port->private_data; in omap8250_irq()
611 struct uart_8250_port *up = up_to_u8250p(port); in omap8250_irq() local
616 if (up->dma) { in omap8250_irq()
622 serial8250_rpm_get(up); in omap8250_irq()
632 if (priv->habit & UART_RX_TIMEOUT_QUIRK && in omap8250_irq()
639 if ((lsr & UART_LSR_OE) && up->overrun_backoff_time_ms > 0) { in omap8250_irq()
642 up->ier = port->serial_in(port, UART_IER); in omap8250_irq()
643 if (up->ier & (UART_IER_RLSI | UART_IER_RDI)) { in omap8250_irq()
644 port->ops->stop_rx(port); in omap8250_irq()
649 cancel_delayed_work(&up->overrun_backoff); in omap8250_irq()
652 delay = msecs_to_jiffies(up->overrun_backoff_time_ms); in omap8250_irq()
653 schedule_delayed_work(&up->overrun_backoff, delay); in omap8250_irq()
656 serial8250_rpm_put(up); in omap8250_irq()
663 struct uart_8250_port *up = up_to_u8250p(port); in omap_8250_startup() local
664 struct omap8250_priv *priv = port->private_data; in omap_8250_startup()
667 if (priv->wakeirq) { in omap_8250_startup()
668 ret = dev_pm_set_dedicated_wake_irq(port->dev, priv->wakeirq); in omap_8250_startup()
673 pm_runtime_get_sync(port->dev); in omap_8250_startup()
675 serial_out(up, UART_FCR, UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); in omap_8250_startup()
677 serial_out(up, UART_LCR, UART_LCR_WLEN8); in omap_8250_startup()
679 up->lsr_saved_flags = 0; in omap_8250_startup()
680 up->msr_saved_flags = 0; in omap_8250_startup()
684 up->dma = NULL; in omap_8250_startup()
686 if (up->dma) { in omap_8250_startup()
687 ret = serial8250_request_dma(up); in omap_8250_startup()
689 dev_warn_ratelimited(port->dev, in omap_8250_startup()
691 up->dma = NULL; in omap_8250_startup()
695 ret = request_irq(port->irq, omap8250_irq, IRQF_SHARED, in omap_8250_startup()
696 dev_name(port->dev), port); in omap_8250_startup()
700 up->ier = UART_IER_RLSI | UART_IER_RDI; in omap_8250_startup()
701 serial_out(up, UART_IER, up->ier); in omap_8250_startup()
704 up->capabilities |= UART_CAP_RPM; in omap_8250_startup()
707 /* Enable module level wake up */ in omap_8250_startup()
708 priv->wer = OMAP_UART_WER_MOD_WKUP; in omap_8250_startup()
709 if (priv->habit & OMAP_UART_WER_HAS_TX_WAKEUP) in omap_8250_startup()
710 priv->wer |= OMAP_UART_TX_WAKEUP_EN; in omap_8250_startup()
711 serial_out(up, UART_OMAP_WER, priv->wer); in omap_8250_startup()
713 if (up->dma && !(priv->habit & UART_HAS_EFR2)) in omap_8250_startup()
714 up->dma->rx_dma(up); in omap_8250_startup()
716 pm_runtime_mark_last_busy(port->dev); in omap_8250_startup()
717 pm_runtime_put_autosuspend(port->dev); in omap_8250_startup()
720 pm_runtime_mark_last_busy(port->dev); in omap_8250_startup()
721 pm_runtime_put_autosuspend(port->dev); in omap_8250_startup()
722 dev_pm_clear_wake_irq(port->dev); in omap_8250_startup()
728 struct uart_8250_port *up = up_to_u8250p(port); in omap_8250_shutdown() local
729 struct omap8250_priv *priv = port->private_data; in omap_8250_shutdown()
731 flush_work(&priv->qos_work); in omap_8250_shutdown()
732 if (up->dma) in omap_8250_shutdown()
733 omap_8250_rx_dma_flush(up); in omap_8250_shutdown()
735 pm_runtime_get_sync(port->dev); in omap_8250_shutdown()
737 serial_out(up, UART_OMAP_WER, 0); in omap_8250_shutdown()
738 if (priv->habit & UART_HAS_EFR2) in omap_8250_shutdown()
739 serial_out(up, UART_OMAP_EFR2, 0x0); in omap_8250_shutdown()
741 up->ier = 0; in omap_8250_shutdown()
742 serial_out(up, UART_IER, 0); in omap_8250_shutdown()
744 if (up->dma) in omap_8250_shutdown()
745 serial8250_release_dma(up); in omap_8250_shutdown()
750 if (up->lcr & UART_LCR_SBC) in omap_8250_shutdown()
751 serial_out(up, UART_LCR, up->lcr & ~UART_LCR_SBC); in omap_8250_shutdown()
752 serial_out(up, UART_FCR, UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); in omap_8250_shutdown()
754 pm_runtime_mark_last_busy(port->dev); in omap_8250_shutdown()
755 pm_runtime_put_autosuspend(port->dev); in omap_8250_shutdown()
756 free_irq(port->irq, port); in omap_8250_shutdown()
757 dev_pm_clear_wake_irq(port->dev); in omap_8250_shutdown()
762 struct omap8250_priv *priv = port->private_data; in omap_8250_throttle()
765 pm_runtime_get_sync(port->dev); in omap_8250_throttle()
767 spin_lock_irqsave(&port->lock, flags); in omap_8250_throttle()
768 port->ops->stop_rx(port); in omap_8250_throttle()
769 priv->throttled = true; in omap_8250_throttle()
770 spin_unlock_irqrestore(&port->lock, flags); in omap_8250_throttle()
772 pm_runtime_mark_last_busy(port->dev); in omap_8250_throttle()
773 pm_runtime_put_autosuspend(port->dev); in omap_8250_throttle()
778 struct omap8250_priv *priv = port->private_data; in omap_8250_unthrottle()
779 struct uart_8250_port *up = up_to_u8250p(port); in omap_8250_unthrottle() local
782 pm_runtime_get_sync(port->dev); in omap_8250_unthrottle()
784 spin_lock_irqsave(&port->lock, flags); in omap_8250_unthrottle()
785 priv->throttled = false; in omap_8250_unthrottle()
786 if (up->dma) in omap_8250_unthrottle()
787 up->dma->rx_dma(up); in omap_8250_unthrottle()
788 up->ier |= UART_IER_RLSI | UART_IER_RDI; in omap_8250_unthrottle()
789 port->read_status_mask |= UART_LSR_DR; in omap_8250_unthrottle()
790 serial_out(up, UART_IER, up->ier); in omap_8250_unthrottle()
791 spin_unlock_irqrestore(&port->lock, flags); in omap_8250_unthrottle()
793 pm_runtime_mark_last_busy(port->dev); in omap_8250_unthrottle()
794 pm_runtime_put_autosuspend(port->dev); in omap_8250_unthrottle()
800 /* Must be called while priv->rx_dma_lock is held */
803 struct uart_8250_dma *dma = p->dma; in __dma_rx_do_complete()
804 struct tty_port *tty_port = &p->port.state->port; in __dma_rx_do_complete()
805 struct omap8250_priv *priv = p->port.private_data; in __dma_rx_do_complete()
806 struct dma_chan *rxchan = dma->rxchan; in __dma_rx_do_complete()
813 if (!dma->rx_running) in __dma_rx_do_complete()
816 cookie = dma->rx_cookie; in __dma_rx_do_complete()
817 dma->rx_running = 0; in __dma_rx_do_complete()
819 /* Re-enable RX FIFO interrupt now that transfer is complete */ in __dma_rx_do_complete()
820 if (priv->habit & UART_HAS_RHR_IT_DIS) { in __dma_rx_do_complete()
828 count = dma->rx_size - state.residue + state.in_flight_bytes; in __dma_rx_do_complete()
829 if (count < dma->rx_size) { in __dma_rx_do_complete()
840 poll_count--) in __dma_rx_do_complete()
843 if (poll_count == -1) in __dma_rx_do_complete()
844 dev_err(p->port.dev, "teardown incomplete\n"); in __dma_rx_do_complete()
849 ret = tty_insert_flip_string(tty_port, dma->rx_buf, count); in __dma_rx_do_complete()
851 p->port.icount.rx += ret; in __dma_rx_do_complete()
852 p->port.icount.buf_overrun += count - ret; in __dma_rx_do_complete()
861 struct omap8250_priv *priv = p->port.private_data; in __dma_rx_complete()
862 struct uart_8250_dma *dma = p->dma; in __dma_rx_complete()
866 spin_lock_irqsave(&p->port.lock, flags); in __dma_rx_complete()
873 if (dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state) != in __dma_rx_complete()
875 spin_unlock_irqrestore(&p->port.lock, flags); in __dma_rx_complete()
879 if (!priv->throttled) { in __dma_rx_complete()
880 p->ier |= UART_IER_RLSI | UART_IER_RDI; in __dma_rx_complete()
881 serial_out(p, UART_IER, p->ier); in __dma_rx_complete()
882 if (!(priv->habit & UART_HAS_EFR2)) in __dma_rx_complete()
886 spin_unlock_irqrestore(&p->port.lock, flags); in __dma_rx_complete()
891 struct omap8250_priv *priv = p->port.private_data; in omap_8250_rx_dma_flush()
892 struct uart_8250_dma *dma = p->dma; in omap_8250_rx_dma_flush()
897 spin_lock_irqsave(&priv->rx_dma_lock, flags); in omap_8250_rx_dma_flush()
899 if (!dma->rx_running) { in omap_8250_rx_dma_flush()
900 spin_unlock_irqrestore(&priv->rx_dma_lock, flags); in omap_8250_rx_dma_flush()
904 ret = dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); in omap_8250_rx_dma_flush()
906 ret = dmaengine_pause(dma->rxchan); in omap_8250_rx_dma_flush()
908 priv->rx_dma_broken = true; in omap_8250_rx_dma_flush()
911 spin_unlock_irqrestore(&priv->rx_dma_lock, flags); in omap_8250_rx_dma_flush()
916 struct omap8250_priv *priv = p->port.private_data; in omap_8250_rx_dma()
917 struct uart_8250_dma *dma = p->dma; in omap_8250_rx_dma()
923 if (priv->rx_dma_broken) in omap_8250_rx_dma()
924 return -EINVAL; in omap_8250_rx_dma()
926 spin_lock_irqsave(&priv->rx_dma_lock, flags); in omap_8250_rx_dma()
928 if (dma->rx_running) { in omap_8250_rx_dma()
931 state = dmaengine_tx_status(dma->rxchan, dma->rx_cookie, NULL); in omap_8250_rx_dma()
937 p->ier &= ~(UART_IER_RLSI | UART_IER_RDI); in omap_8250_rx_dma()
938 serial_out(p, UART_IER, p->ier); in omap_8250_rx_dma()
943 desc = dmaengine_prep_slave_single(dma->rxchan, dma->rx_addr, in omap_8250_rx_dma()
944 dma->rx_size, DMA_DEV_TO_MEM, in omap_8250_rx_dma()
947 err = -EBUSY; in omap_8250_rx_dma()
951 dma->rx_running = 1; in omap_8250_rx_dma()
952 desc->callback = __dma_rx_complete; in omap_8250_rx_dma()
953 desc->callback_param = p; in omap_8250_rx_dma()
955 dma->rx_cookie = dmaengine_submit(desc); in omap_8250_rx_dma()
962 if (priv->habit & UART_HAS_RHR_IT_DIS) { in omap_8250_rx_dma()
968 dma_async_issue_pending(dma->rxchan); in omap_8250_rx_dma()
970 spin_unlock_irqrestore(&priv->rx_dma_lock, flags); in omap_8250_rx_dma()
979 struct uart_8250_dma *dma = p->dma; in omap_8250_dma_tx_complete()
980 struct circ_buf *xmit = &p->port.state->xmit; in omap_8250_dma_tx_complete()
983 struct omap8250_priv *priv = p->port.private_data; in omap_8250_dma_tx_complete()
985 dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr, in omap_8250_dma_tx_complete()
988 spin_lock_irqsave(&p->port.lock, flags); in omap_8250_dma_tx_complete()
990 dma->tx_running = 0; in omap_8250_dma_tx_complete()
992 uart_xmit_advance(&p->port, dma->tx_size); in omap_8250_dma_tx_complete()
994 if (priv->delayed_restore) { in omap_8250_dma_tx_complete()
995 priv->delayed_restore = 0; in omap_8250_dma_tx_complete()
1000 uart_write_wakeup(&p->port); in omap_8250_dma_tx_complete()
1002 if (!uart_circ_empty(xmit) && !uart_tx_stopped(&p->port)) { in omap_8250_dma_tx_complete()
1008 } else if (p->capabilities & UART_CAP_RPM) { in omap_8250_dma_tx_complete()
1013 dma->tx_err = 1; in omap_8250_dma_tx_complete()
1017 spin_unlock_irqrestore(&p->port.lock, flags); in omap_8250_dma_tx_complete()
1022 struct uart_8250_dma *dma = p->dma; in omap_8250_tx_dma()
1023 struct omap8250_priv *priv = p->port.private_data; in omap_8250_tx_dma()
1024 struct circ_buf *xmit = &p->port.state->xmit; in omap_8250_tx_dma()
1029 if (dma->tx_running) in omap_8250_tx_dma()
1031 if (uart_tx_stopped(&p->port) || uart_circ_empty(xmit)) { in omap_8250_tx_dma()
1038 if (dma->tx_err || p->capabilities & UART_CAP_RPM) { in omap_8250_tx_dma()
1039 ret = -EBUSY; in omap_8250_tx_dma()
1046 dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); in omap_8250_tx_dma()
1047 if (priv->habit & OMAP_DMA_TX_KICK) { in omap_8250_tx_dma()
1066 if (tx_lvl == p->tx_loadsz) { in omap_8250_tx_dma()
1067 ret = -EBUSY; in omap_8250_tx_dma()
1070 if (dma->tx_size < 4) { in omap_8250_tx_dma()
1071 ret = -EINVAL; in omap_8250_tx_dma()
1077 desc = dmaengine_prep_slave_single(dma->txchan, in omap_8250_tx_dma()
1078 dma->tx_addr + xmit->tail + skip_byte, in omap_8250_tx_dma()
1079 dma->tx_size - skip_byte, DMA_MEM_TO_DEV, in omap_8250_tx_dma()
1082 ret = -EBUSY; in omap_8250_tx_dma()
1086 dma->tx_running = 1; in omap_8250_tx_dma()
1088 desc->callback = omap_8250_dma_tx_complete; in omap_8250_tx_dma()
1089 desc->callback_param = p; in omap_8250_tx_dma()
1091 dma->tx_cookie = dmaengine_submit(desc); in omap_8250_tx_dma()
1093 dma_sync_single_for_device(dma->txchan->device->dev, dma->tx_addr, in omap_8250_tx_dma()
1096 dma_async_issue_pending(dma->txchan); in omap_8250_tx_dma()
1097 if (dma->tx_err) in omap_8250_tx_dma()
1098 dma->tx_err = 0; in omap_8250_tx_dma()
1102 serial_out(p, UART_TX, xmit->buf[xmit->tail]); in omap_8250_tx_dma()
1105 dma->tx_err = 1; in omap_8250_tx_dma()
1109 static bool handle_rx_dma(struct uart_8250_port *up, unsigned int iir) in handle_rx_dma() argument
1115 omap_8250_rx_dma_flush(up); in handle_rx_dma()
1118 return omap_8250_rx_dma(up); in handle_rx_dma()
1121 static u16 omap_8250_handle_rx_dma(struct uart_8250_port *up, u8 iir, u16 status) in omap_8250_handle_rx_dma() argument
1125 if (handle_rx_dma(up, iir)) { in omap_8250_handle_rx_dma()
1126 status = serial8250_rx_chars(up, status); in omap_8250_handle_rx_dma()
1127 omap_8250_rx_dma(up); in omap_8250_handle_rx_dma()
1134 static void am654_8250_handle_rx_dma(struct uart_8250_port *up, u8 iir, in am654_8250_handle_rx_dma() argument
1141 (up->ier & UART_IER_RDI)) { in am654_8250_handle_rx_dma()
1142 omap_8250_rx_dma(up); in am654_8250_handle_rx_dma()
1143 serial_out(up, UART_OMAP_EFR2, UART_OMAP_EFR2_TIMEOUT_BEHAVE); in am654_8250_handle_rx_dma()
1148 * periodic timeouts, re-enable interrupts. in am654_8250_handle_rx_dma()
1150 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); in am654_8250_handle_rx_dma()
1151 serial_out(up, UART_IER, up->ier); in am654_8250_handle_rx_dma()
1152 omap_8250_rx_dma_flush(up); in am654_8250_handle_rx_dma()
1153 serial_in(up, UART_IIR); in am654_8250_handle_rx_dma()
1154 serial_out(up, UART_OMAP_EFR2, 0x0); in am654_8250_handle_rx_dma()
1155 up->ier |= UART_IER_RLSI | UART_IER_RDI; in am654_8250_handle_rx_dma()
1156 serial_out(up, UART_IER, up->ier); in am654_8250_handle_rx_dma()
1163 * use the default routine in the non-DMA case and this one for with DMA.
1167 struct uart_8250_port *up = up_to_u8250p(port); in omap_8250_dma_handle_irq() local
1168 struct omap8250_priv *priv = up->port.private_data; in omap_8250_dma_handle_irq()
1172 serial8250_rpm_get(up); in omap_8250_dma_handle_irq()
1176 serial8250_rpm_put(up); in omap_8250_dma_handle_irq()
1180 spin_lock(&port->lock); in omap_8250_dma_handle_irq()
1184 if (priv->habit & UART_HAS_EFR2) in omap_8250_dma_handle_irq()
1185 am654_8250_handle_rx_dma(up, iir, status); in omap_8250_dma_handle_irq()
1187 status = omap_8250_handle_rx_dma(up, iir, status); in omap_8250_dma_handle_irq()
1189 serial8250_modem_status(up); in omap_8250_dma_handle_irq()
1190 if (status & UART_LSR_THRE && up->dma->tx_err) { in omap_8250_dma_handle_irq()
1191 if (uart_tx_stopped(&up->port) || in omap_8250_dma_handle_irq()
1192 uart_circ_empty(&up->port.state->xmit)) { in omap_8250_dma_handle_irq()
1193 up->dma->tx_err = 0; in omap_8250_dma_handle_irq()
1194 serial8250_tx_chars(up); in omap_8250_dma_handle_irq()
1200 if (omap_8250_tx_dma(up)) in omap_8250_dma_handle_irq()
1201 serial8250_tx_chars(up); in omap_8250_dma_handle_irq()
1207 serial8250_rpm_put(up); in omap_8250_dma_handle_irq()
1220 return -EINVAL; in omap_8250_rx_dma()
1260 { .compatible = "ti,am654-uart", .data = &am654_platdata, },
1261 { .compatible = "ti,omap2-uart" },
1262 { .compatible = "ti,omap3-uart" },
1263 { .compatible = "ti,omap4-uart", .data = &omap4_platdata, },
1264 { .compatible = "ti,am3352-uart", .data = &am33xx_platdata, },
1265 { .compatible = "ti,am4372-uart", .data = &am33xx_platdata, },
1266 { .compatible = "ti,dra742-uart", .data = &omap4_platdata, },
1273 struct device_node *np = pdev->dev.of_node; in omap8250_probe()
1276 struct uart_8250_port up; in omap8250_probe() local
1287 dev_err(&pdev->dev, "missing registers\n"); in omap8250_probe()
1288 return -EINVAL; in omap8250_probe()
1291 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); in omap8250_probe()
1293 return -ENOMEM; in omap8250_probe()
1295 membase = devm_ioremap(&pdev->dev, regs->start, in omap8250_probe()
1298 return -ENODEV; in omap8250_probe()
1300 memset(&up, 0, sizeof(up)); in omap8250_probe()
1301 up.port.dev = &pdev->dev; in omap8250_probe()
1302 up.port.mapbase = regs->start; in omap8250_probe()
1303 up.port.membase = membase; in omap8250_probe()
1304 up.port.irq = irq; in omap8250_probe()
1313 up.port.type = PORT_8250; in omap8250_probe()
1314 up.port.iotype = UPIO_MEM; in omap8250_probe()
1315 up.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_SOFT_FLOW | in omap8250_probe()
1317 up.port.private_data = priv; in omap8250_probe()
1319 up.port.regshift = 2; in omap8250_probe()
1320 up.port.fifosize = 64; in omap8250_probe()
1321 up.tx_loadsz = 64; in omap8250_probe()
1322 up.capabilities = UART_CAP_FIFO; in omap8250_probe()
1330 up.capabilities |= UART_CAP_RPM; in omap8250_probe()
1332 up.port.set_termios = omap_8250_set_termios; in omap8250_probe()
1333 up.port.set_mctrl = omap8250_set_mctrl; in omap8250_probe()
1334 up.port.pm = omap_8250_pm; in omap8250_probe()
1335 up.port.startup = omap_8250_startup; in omap8250_probe()
1336 up.port.shutdown = omap_8250_shutdown; in omap8250_probe()
1337 up.port.throttle = omap_8250_throttle; in omap8250_probe()
1338 up.port.unthrottle = omap_8250_unthrottle; in omap8250_probe()
1339 up.port.rs485_config = serial8250_em485_config; in omap8250_probe()
1340 up.port.rs485_supported = serial8250_em485_supported; in omap8250_probe()
1341 up.rs485_start_tx = serial8250_em485_start_tx; in omap8250_probe()
1342 up.rs485_stop_tx = serial8250_em485_stop_tx; in omap8250_probe()
1343 up.port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE); in omap8250_probe()
1347 dev_err(&pdev->dev, "failed to get alias\n"); in omap8250_probe()
1350 up.port.line = ret; in omap8250_probe()
1352 if (of_property_read_u32(np, "clock-frequency", &up.port.uartclk)) { in omap8250_probe()
1355 clk = devm_clk_get(&pdev->dev, NULL); in omap8250_probe()
1357 if (PTR_ERR(clk) == -EPROBE_DEFER) in omap8250_probe()
1358 return -EPROBE_DEFER; in omap8250_probe()
1360 up.port.uartclk = clk_get_rate(clk); in omap8250_probe()
1364 if (of_property_read_u32(np, "overrun-throttle-ms", in omap8250_probe()
1365 &up.overrun_backoff_time_ms) != 0) in omap8250_probe()
1366 up.overrun_backoff_time_ms = 0; in omap8250_probe()
1368 priv->wakeirq = irq_of_parse_and_map(np, 1); in omap8250_probe()
1370 pdata = of_device_get_match_data(&pdev->dev); in omap8250_probe()
1372 priv->habit |= pdata->habit; in omap8250_probe()
1374 if (!up.port.uartclk) { in omap8250_probe()
1375 up.port.uartclk = DEFAULT_CLK_SPEED; in omap8250_probe()
1376 dev_warn(&pdev->dev, in omap8250_probe()
1381 priv->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; in omap8250_probe()
1382 priv->calc_latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; in omap8250_probe()
1383 cpu_latency_qos_add_request(&priv->pm_qos_request, priv->latency); in omap8250_probe()
1384 INIT_WORK(&priv->qos_work, omap8250_uart_qos_work); in omap8250_probe()
1386 spin_lock_init(&priv->rx_dma_lock); in omap8250_probe()
1388 device_init_wakeup(&pdev->dev, true); in omap8250_probe()
1389 pm_runtime_enable(&pdev->dev); in omap8250_probe()
1390 pm_runtime_use_autosuspend(&pdev->dev); in omap8250_probe()
1395 * prevent an unsafe default policy with lossy characters on wake-up. in omap8250_probe()
1399 if (!of_get_available_child_count(pdev->dev.of_node)) in omap8250_probe()
1400 pm_runtime_set_autosuspend_delay(&pdev->dev, -1); in omap8250_probe()
1402 pm_runtime_irq_safe(&pdev->dev); in omap8250_probe()
1404 pm_runtime_get_sync(&pdev->dev); in omap8250_probe()
1406 omap_serial_fill_features_erratas(&up, priv); in omap8250_probe()
1407 up.port.handle_irq = omap8250_no_handle_irq; in omap8250_probe()
1408 priv->rx_trigger = RX_TRIGGER; in omap8250_probe()
1409 priv->tx_trigger = TX_TRIGGER; in omap8250_probe()
1419 ret = of_property_count_strings(np, "dma-names"); in omap8250_probe()
1423 up.dma = &priv->omap8250_dma; in omap8250_probe()
1424 up.dma->fn = the_no_dma_filter_fn; in omap8250_probe()
1425 up.dma->tx_dma = omap_8250_tx_dma; in omap8250_probe()
1426 up.dma->rx_dma = omap_8250_rx_dma; in omap8250_probe()
1428 dma_params = pdata->dma_params; in omap8250_probe()
1431 up.dma->rx_size = dma_params->rx_size; in omap8250_probe()
1432 up.dma->rxconf.src_maxburst = dma_params->rx_trigger; in omap8250_probe()
1433 up.dma->txconf.dst_maxburst = dma_params->tx_trigger; in omap8250_probe()
1434 priv->rx_trigger = dma_params->rx_trigger; in omap8250_probe()
1435 priv->tx_trigger = dma_params->tx_trigger; in omap8250_probe()
1437 up.dma->rx_size = RX_TRIGGER; in omap8250_probe()
1438 up.dma->rxconf.src_maxburst = RX_TRIGGER; in omap8250_probe()
1439 up.dma->txconf.dst_maxburst = TX_TRIGGER; in omap8250_probe()
1443 ret = serial8250_register_8250_port(&up); in omap8250_probe()
1445 dev_err(&pdev->dev, "unable to register 8250 port\n"); in omap8250_probe()
1448 priv->line = ret; in omap8250_probe()
1450 pm_runtime_mark_last_busy(&pdev->dev); in omap8250_probe()
1451 pm_runtime_put_autosuspend(&pdev->dev); in omap8250_probe()
1454 pm_runtime_dont_use_autosuspend(&pdev->dev); in omap8250_probe()
1455 pm_runtime_put_sync(&pdev->dev); in omap8250_probe()
1456 pm_runtime_disable(&pdev->dev); in omap8250_probe()
1465 err = pm_runtime_resume_and_get(&pdev->dev); in omap8250_remove()
1469 pm_runtime_dont_use_autosuspend(&pdev->dev); in omap8250_remove()
1470 pm_runtime_put_sync(&pdev->dev); in omap8250_remove()
1471 flush_work(&priv->qos_work); in omap8250_remove()
1472 pm_runtime_disable(&pdev->dev); in omap8250_remove()
1473 serial8250_unregister_port(priv->line); in omap8250_remove()
1474 cpu_latency_qos_remove_request(&priv->pm_qos_request); in omap8250_remove()
1475 device_init_wakeup(&pdev->dev, false); in omap8250_remove()
1486 priv->is_suspending = true; in omap8250_prepare()
1496 priv->is_suspending = false; in omap8250_complete()
1502 struct uart_8250_port *up = serial8250_get_port(priv->line); in omap8250_suspend() local
1504 serial8250_suspend_port(priv->line); in omap8250_suspend()
1508 priv->wer = 0; in omap8250_suspend()
1509 serial_out(up, UART_OMAP_WER, priv->wer); in omap8250_suspend()
1513 flush_work(&priv->qos_work); in omap8250_suspend()
1521 serial8250_resume_port(priv->line); in omap8250_resume()
1530 static int omap8250_lost_context(struct uart_8250_port *up) in omap8250_lost_context() argument
1534 val = serial_in(up, UART_OMAP_SCR); in omap8250_lost_context()
1549 struct uart_8250_port *up = serial8250_get_port(priv->line); in omap8250_soft_reset() local
1563 serial_out(up, UART_OMAP_SCR, OMAP_UART_SCR_DMAMODE_1); in omap8250_soft_reset()
1564 serial_out(up, UART_OMAP_SCR, in omap8250_soft_reset()
1567 sysc = serial_in(up, UART_OMAP_SYSC); in omap8250_soft_reset()
1571 serial_out(up, UART_OMAP_SYSC, sysc); in omap8250_soft_reset()
1576 syss = serial_in(up, UART_OMAP_SYSS); in omap8250_soft_reset()
1577 } while (--timeout && !(syss & OMAP_UART_SYSS_RESETDONE)); in omap8250_soft_reset()
1581 return -ETIMEDOUT; in omap8250_soft_reset()
1590 struct uart_8250_port *up; in omap8250_runtime_suspend() local
1592 /* In case runtime-pm tries this before we are setup */ in omap8250_runtime_suspend()
1596 up = serial8250_get_port(priv->line); in omap8250_runtime_suspend()
1603 if (priv->is_suspending && !console_suspend_enabled) { in omap8250_runtime_suspend()
1604 if (uart_console(&up->port)) in omap8250_runtime_suspend()
1605 return -EBUSY; in omap8250_runtime_suspend()
1608 if (priv->habit & UART_ERRATA_CLOCK_DISABLE) { in omap8250_runtime_suspend()
1616 omap8250_update_mdr1(up, priv); in omap8250_runtime_suspend()
1618 serial_out(up, UART_OMAP_WER, priv->wer); in omap8250_runtime_suspend()
1621 if (up->dma && up->dma->rxchan) in omap8250_runtime_suspend()
1622 omap_8250_rx_dma_flush(up); in omap8250_runtime_suspend()
1624 priv->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE; in omap8250_runtime_suspend()
1625 schedule_work(&priv->qos_work); in omap8250_runtime_suspend()
1633 struct uart_8250_port *up; in omap8250_runtime_resume() local
1635 /* In case runtime-pm tries this before we are setup */ in omap8250_runtime_resume()
1639 up = serial8250_get_port(priv->line); in omap8250_runtime_resume()
1641 if (omap8250_lost_context(up)) in omap8250_runtime_resume()
1642 omap8250_restore_regs(up); in omap8250_runtime_resume()
1644 if (up->dma && up->dma->rxchan && !(priv->habit & UART_HAS_EFR2)) in omap8250_runtime_resume()
1645 omap_8250_rx_dma(up); in omap8250_runtime_resume()
1647 priv->latency = priv->calc_latency; in omap8250_runtime_resume()
1648 schedule_work(&priv->qos_work); in omap8250_runtime_resume()
1671 idx = *omap_str - '0'; in omap8250_console_fixup()