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[ARM] 2866/1: add i.MX set_mctrl / get_mctrl functions

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Patch from Sascha Hauer

This patch adds support for setting and getting RTS / CTS via
set_mtctrl / get_mctrl functions.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Sascha Hauer
2005-08-31 21:48:47 +01:00
committed by Russell King
parent b129a8ccd5
commit 0f302dc354
9 changed files with 24 additions and 223 deletions
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drivers/serial/serial_core.c
-132
View File
@@ -2289,143 +2289,11 @@ int uart_match_port(struct uart_port *port1, struct uart_port *port2)
}
EXPORT_SYMBOL(uart_match_port);
/*
* Try to find an unused uart_state slot for a port.
*/
static struct uart_state *
uart_find_match_or_unused(struct uart_driver *drv, struct uart_port *port)
{
int i;
/*
* First, find a port entry which matches. Note: if we do
* find a matching entry, and it has a non-zero use count,
* then we can't register the port.
*/
for (i = 0; i < drv->nr; i++)
if (uart_match_port(drv->state[i].port, port))
return &drv->state[i];
/*
* We didn't find a matching entry, so look for the first
* free entry. We look for one which hasn't been previously
* used (indicated by zero iobase).
*/
for (i = 0; i < drv->nr; i++)
if (drv->state[i].port->type == PORT_UNKNOWN &&
drv->state[i].port->iobase == 0 &&
drv->state[i].count == 0)
return &drv->state[i];
/*
* That also failed. Last resort is to find any currently
* entry which doesn't have a real port associated with it.
*/
for (i = 0; i < drv->nr; i++)
if (drv->state[i].port->type == PORT_UNKNOWN &&
drv->state[i].count == 0)
return &drv->state[i];
return NULL;
}
/**
* uart_register_port: register uart settings with a port
* @drv: pointer to the uart low level driver structure for this port
* @port: uart port structure describing the port
*
* Register UART settings with the specified low level driver. Detect
* the type of the port if UPF_BOOT_AUTOCONF is set, and detect the
* IRQ if UPF_AUTO_IRQ is set.
*
* We try to pick the same port for the same IO base address, so that
* when a modem is plugged in, unplugged and plugged back in, it gets
* allocated the same port.
*
* Returns negative error, or positive line number.
*/
int uart_register_port(struct uart_driver *drv, struct uart_port *port)
{
struct uart_state *state;
int ret;
down(&port_sem);
state = uart_find_match_or_unused(drv, port);
if (state) {
/*
* Ok, we've found a line that we can use.
*
* If we find a port that matches this one, and it appears
* to be in-use (even if it doesn't have a type) we shouldn't
* alter it underneath itself - the port may be open and
* trying to do useful work.
*/
if (uart_users(state) != 0) {
ret = -EBUSY;
goto out;
}
/*
* If the port is already initialised, don't touch it.
*/
if (state->port->type == PORT_UNKNOWN) {
state->port->iobase = port->iobase;
state->port->membase = port->membase;
state->port->irq = port->irq;
state->port->uartclk = port->uartclk;
state->port->fifosize = port->fifosize;
state->port->regshift = port->regshift;
state->port->iotype = port->iotype;
state->port->flags = port->flags;
state->port->line = state - drv->state;
state->port->mapbase = port->mapbase;
uart_configure_port(drv, state, state->port);
}
ret = state->port->line;
} else
ret = -ENOSPC;
out:
up(&port_sem);
return ret;
}
/**
* uart_unregister_port - de-allocate a port
* @drv: pointer to the uart low level driver structure for this port
* @line: line index previously returned from uart_register_port()
*
* Hang up the specified line associated with the low level driver,
* and mark the port as unused.
*/
void uart_unregister_port(struct uart_driver *drv, int line)
{
struct uart_state *state;
if (line < 0 || line >= drv->nr) {
printk(KERN_ERR "Attempt to unregister ");
printk("%s%d", drv->dev_name, line);
printk("\n");
return;
}
state = drv->state + line;
down(&port_sem);
uart_unconfigure_port(drv, state);
up(&port_sem);
}
EXPORT_SYMBOL(uart_write_wakeup);
EXPORT_SYMBOL(uart_register_driver);
EXPORT_SYMBOL(uart_unregister_driver);
EXPORT_SYMBOL(uart_suspend_port);
EXPORT_SYMBOL(uart_resume_port);
EXPORT_SYMBOL(uart_register_port);
EXPORT_SYMBOL(uart_unregister_port);
EXPORT_SYMBOL(uart_add_one_port);
EXPORT_SYMBOL(uart_remove_one_port);