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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: Noam Camus <noamc@ezchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Noam Camus 2015-12-12 19:18:26 +02:00 committed by Greg Kroah-Hartman
parent cdcea058e5
commit 4625090187
1 changed files with 23 additions and 0 deletions
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23
drivers/tty/serial/8250/8250_dw.c
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@ -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;