serial: 8250_dw: Add support for IrDA SIR mode (0e0b989e) · Commits · 戴 / test

drivers/tty/serial/8250/8250_dw.c

+22 −0

Original line number	Diff line number	Diff line
		@@ -53,6 +53,8 @@
		/* Helper for fifo size calculation */
		#define DW_UART_CPR_FIFO_SIZE(a) (((a >> 16) & 0xff) * 16)

		/* DesignWare specific register fields */
		#define DW_UART_MCR_SIRE BIT(6)

		struct dw8250_data {
		u8 usr_reg;
		@@ -254,6 +256,22 @@ out:
		serial8250_do_set_termios(p, termios, old);
		}

		static void dw8250_set_ldisc(struct uart_port p, struct ktermios termios)
		{
		struct uart_8250_port *up = up_to_u8250p(p);
		unsigned int mcr = p->serial_in(p, UART_MCR);

		if (up->capabilities & UART_CAP_IRDA) {
		if (termios->c_line == N_IRDA)
		mcr \|= DW_UART_MCR_SIRE;
		else
		mcr &= ~DW_UART_MCR_SIRE;

		p->serial_out(p, UART_MCR, mcr);
		}
		serial8250_do_set_ldisc(p, termios);
		}

		/*
		* dw8250_fallback_dma_filter will prevent the UART from getting just any free
		* channel on platforms that have DMA engines, but don't have any channels
		@@ -357,6 +375,9 @@ static void dw8250_setup_port(struct uart_port *p)

		if (reg & DW_UART_CPR_AFCE_MODE)
		up->capabilities \|= UART_CAP_AFE;

		if (reg & DW_UART_CPR_SIR_MODE)
		up->capabilities \|= UART_CAP_IRDA;
		}

		static int dw8250_probe(struct platform_device *pdev)
		@@ -392,6 +413,7 @@ static int dw8250_probe(struct platform_device *pdev)
		p->iotype = UPIO_MEM;
		p->serial_in = dw8250_serial_in;
		p->serial_out = dw8250_serial_out;
		p->set_ldisc = dw8250_set_ldisc;

		p->membase = devm_ioremap(dev, regs->start, resource_size(regs));
		if (!p->membase)