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Commit 46250901 authored by Noam Camus's avatar Noam Camus Committed by Greg Kroah-Hartman
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serial: 8250_dw: Add support for big-endian MMIO accesses 



Add support for UPIO_MEM32BE in addition to UPIO_MEM32.

For big endian we use 2 new accessors similar to little endian,
called dw8250_serial_out32be() and dw8250_serial_in32be().

Signed-off-by: default avatarNoam Camus <noamc@ezchip.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cdcea058

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

+23 −0
Original line number Diff line number Diff line
@@ -182,6 +182,24 @@ static unsigned int dw8250_serial_in32(struct uart_port *p, int offset) 
	return dw8250_modify_msr(p, offset, value);

}



static void dw8250_serial_out32be(struct uart_port *p, int offset, int value)

{

	struct dw8250_data *d = p->private_data;



	iowrite32be(value, p->membase + (offset << p->regshift));



	if (offset == UART_LCR && !d->uart_16550_compatible)

		dw8250_check_lcr(p, value);

}



static unsigned int dw8250_serial_in32be(struct uart_port *p, int offset)

{

       unsigned int value = ioread32be(p->membase + (offset << p->regshift));



       return dw8250_modify_msr(p, offset, value);

}





static int dw8250_handle_irq(struct uart_port *p)

{

	struct dw8250_data *d = p->private_data;
@@ -276,6 +294,11 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data) 
			data->skip_autocfg = true;

		}

#endif

		if (of_device_is_big_endian(p->dev->of_node)) {

			p->iotype = UPIO_MEM32BE;

			p->serial_in = dw8250_serial_in32be;

			p->serial_out = dw8250_serial_out32be;

		}

	} else if (has_acpi_companion(p->dev)) {

		p->iotype = UPIO_MEM32;

		p->regshift = 2;