Lines Matching +full:mt6577 +full:- +full:uart +full:- +full:dma
1 // SPDX-License-Identifier: GPL-2.0+
19 #include <linux/dma-mapping.h>
28 #define MTK_UART_RATE_FIX 0x0d /* UART Rate Fix Register */
31 #define MTK_UART_DMA_EN 0x13 /* DMA Enable register */
74 struct uart_8250_dma *dma; member
94 struct uart_8250_dma *dma = up->dma; in mtk8250_dma_rx_complete() local
95 struct mtk8250_data *data = up->port.private_data; in mtk8250_dma_rx_complete()
96 struct tty_port *tty_port = &up->port.state->port; in mtk8250_dma_rx_complete()
102 if (data->rx_status == DMA_RX_SHUTDOWN) in mtk8250_dma_rx_complete()
105 uart_port_lock_irqsave(&up->port, &flags); in mtk8250_dma_rx_complete()
107 dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); in mtk8250_dma_rx_complete()
108 total = dma->rx_size - state.residue; in mtk8250_dma_rx_complete()
111 if ((data->rx_pos + cnt) > dma->rx_size) in mtk8250_dma_rx_complete()
112 cnt = dma->rx_size - data->rx_pos; in mtk8250_dma_rx_complete()
114 ptr = (unsigned char *)(data->rx_pos + dma->rx_buf); in mtk8250_dma_rx_complete()
116 data->rx_pos += cnt; in mtk8250_dma_rx_complete()
119 ptr = (unsigned char *)(dma->rx_buf); in mtk8250_dma_rx_complete()
120 cnt = total - cnt; in mtk8250_dma_rx_complete()
122 data->rx_pos = cnt; in mtk8250_dma_rx_complete()
125 up->port.icount.rx += copied; in mtk8250_dma_rx_complete()
131 uart_port_unlock_irqrestore(&up->port, flags); in mtk8250_dma_rx_complete()
136 struct uart_8250_dma *dma = up->dma; in mtk8250_rx_dma() local
139 desc = dmaengine_prep_slave_single(dma->rxchan, dma->rx_addr, in mtk8250_rx_dma()
140 dma->rx_size, DMA_DEV_TO_MEM, in mtk8250_rx_dma()
147 desc->callback = mtk8250_dma_rx_complete; in mtk8250_rx_dma()
148 desc->callback_param = up; in mtk8250_rx_dma()
150 dma->rx_cookie = dmaengine_submit(desc); in mtk8250_rx_dma()
152 dma_async_issue_pending(dma->rxchan); in mtk8250_rx_dma()
157 struct uart_8250_dma *dma = up->dma; in mtk8250_dma_enable() local
158 struct mtk8250_data *data = up->port.private_data; in mtk8250_dma_enable()
161 if (data->rx_status != DMA_RX_START) in mtk8250_dma_enable()
164 dma->rxconf.src_port_window_size = dma->rx_size; in mtk8250_dma_enable()
165 dma->rxconf.src_addr = dma->rx_addr; in mtk8250_dma_enable()
167 dma->txconf.dst_port_window_size = UART_XMIT_SIZE; in mtk8250_dma_enable()
168 dma->txconf.dst_addr = dma->tx_addr; in mtk8250_dma_enable()
179 if (dmaengine_slave_config(dma->rxchan, &dma->rxconf) != 0) in mtk8250_dma_enable()
180 pr_err("failed to configure rx dma channel\n"); in mtk8250_dma_enable()
181 if (dmaengine_slave_config(dma->txchan, &dma->txconf) != 0) in mtk8250_dma_enable()
182 pr_err("failed to configure tx dma channel\n"); in mtk8250_dma_enable()
184 data->rx_status = DMA_RX_RUNNING; in mtk8250_dma_enable()
185 data->rx_pos = 0; in mtk8250_dma_enable()
194 struct mtk8250_data *data = port->private_data; in mtk8250_startup()
196 /* disable DMA for console */ in mtk8250_startup()
198 up->dma = NULL; in mtk8250_startup()
200 if (up->dma) { in mtk8250_startup()
201 data->rx_status = DMA_RX_START; in mtk8250_startup()
202 uart_circ_clear(&port->state->xmit); in mtk8250_startup()
205 memset(&port->icount, 0, sizeof(port->icount)); in mtk8250_startup()
214 struct mtk8250_data *data = port->private_data; in mtk8250_shutdown()
216 if (up->dma) in mtk8250_shutdown()
217 data->rx_status = DMA_RX_SHUTDOWN; in mtk8250_shutdown()
226 lockdep_assert_held_once(&up->port.lock); in mtk8250_disable_intrs()
234 lockdep_assert_held_once(&up->port.lock); in mtk8250_enable_intrs()
241 struct uart_port *port = &up->port; in mtk8250_set_flow_ctrl()
245 lockdep_assert_held_once(&port->lock); in mtk8250_set_flow_ctrl()
290 serial_out(up, MTK_UART_XON1, START_CHAR(port->state->port.tty)); in mtk8250_set_flow_ctrl()
291 serial_out(up, MTK_UART_XOFF1, STOP_CHAR(port->state->port.tty)); in mtk8250_set_flow_ctrl()
317 if (up->dma) { in mtk8250_set_termios()
319 devm_kfree(up->port.dev, up->dma); in mtk8250_set_termios()
320 up->dma = NULL; in mtk8250_set_termios()
356 port->uartclk / 16 / UART_DIV_MAX, in mtk8250_set_termios()
357 port->uartclk); in mtk8250_set_termios()
364 quot = DIV_ROUND_UP(port->uartclk, 256 * baud); in mtk8250_set_termios()
374 * Update the per-port timeout. in mtk8250_set_termios()
376 uart_update_timeout(port, termios->c_cflag, baud); in mtk8250_set_termios()
378 /* set DLAB we have cval saved in up->lcr from the call to the core */ in mtk8250_set_termios()
379 serial_port_out(port, UART_LCR, up->lcr | UART_LCR_DLAB); in mtk8250_set_termios()
383 serial_port_out(port, UART_LCR, up->lcr); in mtk8250_set_termios()
388 tmp = (port->uartclk / (baud * quot)) - 1; in mtk8250_set_termios()
391 (tmp >> 1) - 1); in mtk8250_set_termios()
394 fraction = ((port->uartclk * 100) / baud / quot) % 100; in mtk8250_set_termios()
407 if ((termios->c_cflag & CRTSCTS) && (!(termios->c_iflag & CRTSCTS))) in mtk8250_set_termios()
409 else if (termios->c_iflag & CRTSCTS) in mtk8250_set_termios()
417 up->port.cons->cflag = termios->c_cflag; in mtk8250_set_termios()
428 struct uart_8250_port *up = serial8250_get_port(data->line); in mtk8250_runtime_suspend()
430 /* wait until UART in idle status */ in mtk8250_runtime_suspend()
434 clk_disable_unprepare(data->bus_clk); in mtk8250_runtime_suspend()
443 clk_prepare_enable(data->bus_clk); in mtk8250_runtime_resume()
452 pm_runtime_get_sync(port->dev); in mtk8250_do_pm()
457 pm_runtime_put_sync_suspend(port->dev); in mtk8250_do_pm()
474 data->uart_clk = devm_clk_get(&pdev->dev, "baud"); in mtk8250_probe_of()
475 if (IS_ERR(data->uart_clk)) { in mtk8250_probe_of()
480 data->uart_clk = devm_clk_get(&pdev->dev, NULL); in mtk8250_probe_of()
481 if (IS_ERR(data->uart_clk)) { in mtk8250_probe_of()
482 dev_warn(&pdev->dev, "Can't get uart clock\n"); in mtk8250_probe_of()
483 return PTR_ERR(data->uart_clk); in mtk8250_probe_of()
489 data->bus_clk = devm_clk_get_enabled(&pdev->dev, "bus"); in mtk8250_probe_of()
490 if (IS_ERR(data->bus_clk)) in mtk8250_probe_of()
491 return PTR_ERR(data->bus_clk); in mtk8250_probe_of()
493 data->dma = NULL; in mtk8250_probe_of()
495 dmacnt = of_property_count_strings(pdev->dev.of_node, "dma-names"); in mtk8250_probe_of()
497 data->dma = devm_kzalloc(&pdev->dev, sizeof(*data->dma), in mtk8250_probe_of()
499 if (!data->dma) in mtk8250_probe_of()
500 return -ENOMEM; in mtk8250_probe_of()
502 data->dma->fn = mtk8250_dma_filter; in mtk8250_probe_of()
503 data->dma->rx_size = MTK_UART_RX_SIZE; in mtk8250_probe_of()
504 data->dma->rxconf.src_maxburst = MTK_UART_RX_TRIGGER; in mtk8250_probe_of()
505 data->dma->txconf.dst_maxburst = MTK_UART_TX_TRIGGER; in mtk8250_probe_of()
514 struct uart_8250_port uart = {}; in mtk8250_probe() local
525 dev_err(&pdev->dev, "no registers defined\n"); in mtk8250_probe()
526 return -EINVAL; in mtk8250_probe()
529 uart.port.membase = devm_ioremap(&pdev->dev, regs->start, in mtk8250_probe()
531 if (!uart.port.membase) in mtk8250_probe()
532 return -ENOMEM; in mtk8250_probe()
534 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); in mtk8250_probe()
536 return -ENOMEM; in mtk8250_probe()
538 data->clk_count = 0; in mtk8250_probe()
540 if (pdev->dev.of_node) { in mtk8250_probe()
541 err = mtk8250_probe_of(pdev, &uart.port, data); in mtk8250_probe()
545 return -ENODEV; in mtk8250_probe()
547 spin_lock_init(&uart.port.lock); in mtk8250_probe()
548 uart.port.mapbase = regs->start; in mtk8250_probe()
549 uart.port.irq = irq; in mtk8250_probe()
550 uart.port.pm = mtk8250_do_pm; in mtk8250_probe()
551 uart.port.type = PORT_16550; in mtk8250_probe()
552 uart.port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT; in mtk8250_probe()
553 uart.port.dev = &pdev->dev; in mtk8250_probe()
554 uart.port.iotype = UPIO_MEM32; in mtk8250_probe()
555 uart.port.regshift = 2; in mtk8250_probe()
556 uart.port.private_data = data; in mtk8250_probe()
557 uart.port.shutdown = mtk8250_shutdown; in mtk8250_probe()
558 uart.port.startup = mtk8250_startup; in mtk8250_probe()
559 uart.port.set_termios = mtk8250_set_termios; in mtk8250_probe()
560 uart.port.uartclk = clk_get_rate(data->uart_clk); in mtk8250_probe()
562 if (data->dma) in mtk8250_probe()
563 uart.dma = data->dma; in mtk8250_probe()
567 writel(0x0, uart.port.membase + in mtk8250_probe()
568 (MTK_UART_RATE_FIX << uart.port.regshift)); in mtk8250_probe()
572 data->line = serial8250_register_8250_port(&uart); in mtk8250_probe()
573 if (data->line < 0) in mtk8250_probe()
574 return data->line; in mtk8250_probe()
576 data->rx_wakeup_irq = platform_get_irq_optional(pdev, 1); in mtk8250_probe()
578 pm_runtime_set_active(&pdev->dev); in mtk8250_probe()
579 pm_runtime_enable(&pdev->dev); in mtk8250_probe()
588 pm_runtime_get_sync(&pdev->dev); in mtk8250_remove()
590 serial8250_unregister_port(data->line); in mtk8250_remove()
592 pm_runtime_disable(&pdev->dev); in mtk8250_remove()
593 pm_runtime_put_noidle(&pdev->dev); in mtk8250_remove()
599 int irq = data->rx_wakeup_irq; in mtk8250_suspend()
602 serial8250_suspend_port(data->line); in mtk8250_suspend()
612 serial8250_resume_port(data->line); in mtk8250_suspend()
623 int irq = data->rx_wakeup_irq; in mtk8250_resume()
629 serial8250_resume_port(data->line); in mtk8250_resume()
641 { .compatible = "mediatek,mt6577-uart" },
648 .name = "mt6577-uart",
661 if (!device->port.membase) in early_mtk8250_setup()
662 return -ENODEV; in early_mtk8250_setup()
664 device->port.iotype = UPIO_MEM32; in early_mtk8250_setup()
665 device->port.regshift = 2; in early_mtk8250_setup()
670 OF_EARLYCON_DECLARE(mtk8250, "mediatek,mt6577-uart", early_mtk8250_setup);