static void __dma_tx_complete(void *param) { struct uart_8250_port *p = param; struct uart_8250_dma *dma = p->dma; struct circ_buf *xmit = &p->port.state->xmit; unsigned long flags; int ret; dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr, UART_XMIT_SIZE, DMA_TO_DEVICE); spin_lock_irqsave(&p->port.lock, flags); dma->tx_running = 0; xmit->tail += dma->tx_size; xmit->tail &= UART_XMIT_SIZE - 1; p->port.icount.tx += dma->tx_size; if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(&p->port); ret = serial8250_tx_dma(p); if (ret) { p->ier |= UART_IER_THRI; serial_port_out(&p->port, UART_IER, p->ier); } spin_unlock_irqrestore(&p->port.lock, flags); }
static void omap_8250_dma_tx_complete(void *param) { struct uart_8250_port *p = param; struct uart_8250_dma *dma = p->dma; struct circ_buf *xmit = &p->port.state->xmit; unsigned long flags; bool en_thri = false; struct omap8250_priv *priv = p->port.private_data; dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr, UART_XMIT_SIZE, DMA_TO_DEVICE); spin_lock_irqsave(&p->port.lock, flags); dma->tx_running = 0; xmit->tail += dma->tx_size; xmit->tail &= UART_XMIT_SIZE - 1; p->port.icount.tx += dma->tx_size; if (priv->delayed_restore) { priv->delayed_restore = 0; omap8250_restore_regs(p); } if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(&p->port); if (!uart_circ_empty(xmit) && !uart_tx_stopped(&p->port)) { int ret; ret = omap_8250_tx_dma(p); if (ret) en_thri = true; } else if (p->capabilities & UART_CAP_RPM) { en_thri = true; } if (en_thri) { dma->tx_err = 1; p->ier |= UART_IER_THRI; serial_port_out(&p->port, UART_IER, p->ier); } spin_unlock_irqrestore(&p->port.lock, flags); }
static void mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) { struct uart_8250_port *up = up_to_u8250p(port); unsigned long flags; unsigned int baud, quot; #ifdef CONFIG_SERIAL_8250_DMA if (up->dma) { if (uart_console(port)) { devm_kfree(up->port.dev, up->dma); up->dma = NULL; } else { mtk8250_dma_enable(up); } } #endif serial8250_do_set_termios(port, termios, old); /* * Mediatek UARTs use an extra highspeed register (UART_MTK_HIGHS) * * We need to recalcualte the quot register, as the claculation depends * on the vaule in the highspeed register. * * Some baudrates are not supported by the chip, so we use the next * lower rate supported and update termios c_flag. * * If highspeed register is set to 3, we need to specify sample count * and sample point to increase accuracy. If not, we reset the * registers to their default values. */ baud = uart_get_baud_rate(port, termios, old, port->uartclk / 16 / UART_DIV_MAX, port->uartclk); if (baud <= 115200) { serial_port_out(port, UART_MTK_HIGHS, 0x0); quot = uart_get_divisor(port, baud); } else if (baud <= 576000) { serial_port_out(port, UART_MTK_HIGHS, 0x2); /* Set to next lower baudrate supported */ if ((baud == 500000) || (baud == 576000)) baud = 460800; quot = DIV_ROUND_UP(port->uartclk, 4 * baud); } else { serial_port_out(port, UART_MTK_HIGHS, 0x3); quot = DIV_ROUND_UP(port->uartclk, 256 * baud); } /* * Ok, we're now changing the port state. Do it with * interrupts disabled. */ spin_lock_irqsave(&port->lock, flags); /* set DLAB we have cval saved in up->lcr from the call to the core */ serial_port_out(port, UART_LCR, up->lcr | UART_LCR_DLAB); serial_dl_write(up, quot); /* reset DLAB */ serial_port_out(port, UART_LCR, up->lcr); if (baud > 460800) { unsigned int tmp; tmp = DIV_ROUND_CLOSEST(port->uartclk, quot * baud); serial_port_out(port, UART_MTK_SAMPLE_COUNT, tmp - 1); serial_port_out(port, UART_MTK_SAMPLE_POINT, (tmp - 2) >> 1); } else {