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serial: 8250_dw: Add support for IrDA SIR mode

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Add a set_ldisc function to enable/disable IrDA SIR mode according to
the new line discipline, if IrDA SIR mode is supported by the hardware
configuration.

Signed-off-by: Ed Blake <ed.blake@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ed Blake 2016-11-10 18:07:56 +00:00 committed by Greg Kroah-Hartman
parent db405a8f8b
commit 0e0b989eb3
1 changed files with 22 additions and 0 deletions
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22
drivers/tty/serial/8250/8250_dw.c
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@ -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)