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tty: serial: altera_uart: Use port->regshift to store bus shift 

Use the regshift member of struct uart_port to store the address stride
from platform data. This way we can save one dereference per call of
altera_uart_readl and altera_uart_writel.

This also allows us to use the driver without platform data, which is
needed for device tree support in the Nios2 port.

Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tobias Klauser 2011-02-09 10:57:04 +01:00 committed by Greg Kroah-Hartman
parent e96fabd879
commit 2780ad42f5
1 changed files with 7 additions and 7 deletions
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14
drivers/tty/serial/altera_uart.c
View File

@ -86,16 +86,12 @@ struct altera_uart {
static u32 altera_uart_readl(struct uart_port *port, int reg)
{
struct altera_uart_platform_uart *platp = port->private_data;
return readl(port->membase + (reg << platp->bus_shift));
return readl(port->membase + (reg << port->regshift));
}
static void altera_uart_writel(struct uart_port *port, u32 dat, int reg)
{
struct altera_uart_platform_uart *platp = port->private_data;
writel(dat, port->membase + (reg << platp->bus_shift));
writel(dat, port->membase + (reg << port->regshift));
}
static unsigned int altera_uart_tx_empty(struct uart_port *port)
@ -546,13 +542,17 @@ static int __devinit altera_uart_probe(struct platform_device *pdev)
if (!port->membase)
return -ENOMEM;
if (platp)
port->regshift = platp->bus_shift;
else
port->regshift = 0;
port->line = i;
port->type = PORT_ALTERA_UART;
port->iotype = SERIAL_IO_MEM;
port->uartclk = platp->uartclk;
port->ops = &altera_uart_ops;
port->flags = UPF_BOOT_AUTOCONF;
port->private_data = platp;
uart_add_one_port(&altera_uart_driver, port);