#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
-#define uart_users(state) ((state)->count + ((state)->info ? (state)->info->blocked_open : 0))
+#define uart_users(state) ((state)->count + (state)->info.port.blocked_open)
#ifdef CONFIG_SERIAL_CORE_CONSOLE
#define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line)
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
- if (!uart_circ_empty(&state->info->xmit) && state->info->xmit.buf &&
+ if (!uart_circ_empty(&state->info.xmit) && state->info.xmit.buf &&
!tty->stopped && !tty->hw_stopped)
port->ops->start_tx(port);
}
static void uart_tasklet_action(unsigned long data)
{
struct uart_state *state = (struct uart_state *)data;
- tty_wakeup(state->info->tty);
+ tty_wakeup(state->info.port.tty);
}
static inline void
/*
* Startup the port. This will be called once per open. All calls
- * will be serialised by the per-port semaphore.
+ * will be serialised by the per-port mutex.
*/
static int uart_startup(struct uart_state *state, int init_hw)
{
- struct uart_info *info = state->info;
+ struct uart_info *info = &state->info;
struct uart_port *port = state->port;
unsigned long page;
int retval = 0;
* once we have successfully opened the port. Also set
* up the tty->alt_speed kludge
*/
- set_bit(TTY_IO_ERROR, &info->tty->flags);
+ set_bit(TTY_IO_ERROR, &info->port.tty->flags);
if (port->type == PORT_UNKNOWN)
return 0;
* buffer.
*/
if (!info->xmit.buf) {
+ /* This is protected by the per port mutex */
page = get_zeroed_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
* Setup the RTS and DTR signals once the
* port is open and ready to respond.
*/
- if (info->tty->termios->c_cflag & CBAUD)
+ if (info->port.tty->termios->c_cflag & CBAUD)
uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
}
if (info->flags & UIF_CTS_FLOW) {
spin_lock_irq(&port->lock);
if (!(port->ops->get_mctrl(port) & TIOCM_CTS))
- info->tty->hw_stopped = 1;
+ info->port.tty->hw_stopped = 1;
spin_unlock_irq(&port->lock);
}
info->flags |= UIF_INITIALIZED;
- clear_bit(TTY_IO_ERROR, &info->tty->flags);
+ clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
}
if (retval && capable(CAP_SYS_ADMIN))
*/
static void uart_shutdown(struct uart_state *state)
{
- struct uart_info *info = state->info;
+ struct uart_info *info = &state->info;
struct uart_port *port = state->port;
+ struct tty_struct *tty = info->port.tty;
/*
* Set the TTY IO error marker
*/
- if (info->tty)
- set_bit(TTY_IO_ERROR, &info->tty->flags);
+ if (tty)
+ set_bit(TTY_IO_ERROR, &tty->flags);
if (info->flags & UIF_INITIALIZED) {
info->flags &= ~UIF_INITIALIZED;
/*
* Turn off DTR and RTS early.
*/
- if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
+ if (!tty || (tty->termios->c_cflag & HUPCL))
uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
/*
static void
uart_change_speed(struct uart_state *state, struct ktermios *old_termios)
{
- struct tty_struct *tty = state->info->tty;
+ struct tty_struct *tty = state->info.port.tty;
struct uart_port *port = state->port;
struct ktermios *termios;
* Set flags based on termios cflag
*/
if (termios->c_cflag & CRTSCTS)
- state->info->flags |= UIF_CTS_FLOW;
+ state->info.flags |= UIF_CTS_FLOW;
else
- state->info->flags &= ~UIF_CTS_FLOW;
+ state->info.flags &= ~UIF_CTS_FLOW;
if (termios->c_cflag & CLOCAL)
- state->info->flags &= ~UIF_CHECK_CD;
+ state->info.flags &= ~UIF_CHECK_CD;
else
- state->info->flags |= UIF_CHECK_CD;
+ state->info.flags |= UIF_CHECK_CD;
port->ops->set_termios(port, termios, old_termios);
}
{
struct uart_state *state = tty->driver_data;
- return __uart_put_char(state->port, &state->info->xmit, ch);
+ return __uart_put_char(state->port, &state->info.xmit, ch);
}
static void uart_flush_chars(struct tty_struct *tty)
* This means you called this function _after_ the port was
* closed. No cookie for you.
*/
- if (!state || !state->info) {
+ if (!state) {
WARN_ON(1);
return -EL3HLT;
}
port = state->port;
- circ = &state->info->xmit;
+ circ = &state->info.xmit;
if (!circ->buf)
return 0;
static int uart_write_room(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
+ unsigned long flags;
+ int ret;
- return uart_circ_chars_free(&state->info->xmit);
+ spin_lock_irqsave(&state->port->lock, flags);
+ ret = uart_circ_chars_free(&state->info.xmit);
+ spin_unlock_irqrestore(&state->port->lock, flags);
+ return ret;
}
static int uart_chars_in_buffer(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
+ unsigned long flags;
+ int ret;
- return uart_circ_chars_pending(&state->info->xmit);
+ spin_lock_irqsave(&state->port->lock, flags);
+ ret = uart_circ_chars_pending(&state->info.xmit);
+ spin_unlock_irqrestore(&state->port->lock, flags);
+ return ret;
}
static void uart_flush_buffer(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
- struct uart_port *port = state->port;
+ struct uart_port *port;
unsigned long flags;
/*
* This means you called this function _after_ the port was
* closed. No cookie for you.
*/
- if (!state || !state->info) {
+ if (!state) {
WARN_ON(1);
return;
}
+ port = state->port;
pr_debug("uart_flush_buffer(%d) called\n", tty->index);
spin_lock_irqsave(&port->lock, flags);
- uart_circ_clear(&state->info->xmit);
+ uart_circ_clear(&state->info.xmit);
+ if (port->ops->flush_buffer)
+ port->ops->flush_buffer(port);
spin_unlock_irqrestore(&port->lock, flags);
tty_wakeup(tty);
}
struct serial_struct tmp;
memset(&tmp, 0, sizeof(tmp));
+
+ /* Ensure the state we copy is consistent and no hardware changes
+ occur as we go */
+ mutex_lock(&state->mutex);
+
tmp.type = port->type;
tmp.line = port->line;
tmp.port = port->iobase;
tmp.iomem_reg_shift = port->regshift;
tmp.iomem_base = (void *)(unsigned long)port->mapbase;
+ mutex_unlock(&state->mutex);
+
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
return -EFAULT;
return 0;
if (port->ops->verify_port)
retval = port->ops->verify_port(port, &new_serial);
- if ((new_serial.irq >= NR_IRQS) || (new_serial.irq < 0) ||
+ if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) ||
(new_serial.baud_base < 9600))
retval = -EINVAL;
state->closing_wait = closing_wait;
if (new_serial.xmit_fifo_size)
port->fifosize = new_serial.xmit_fifo_size;
- if (state->info->tty)
- state->info->tty->low_latency =
+ if (state->info.port.tty)
+ state->info.port.tty->low_latency =
(port->flags & UPF_LOW_LATENCY) ? 1 : 0;
check_and_exit:
retval = 0;
if (port->type == PORT_UNKNOWN)
goto exit;
- if (state->info->flags & UIF_INITIALIZED) {
+ if (state->info.flags & UIF_INITIALIZED) {
if (((old_flags ^ port->flags) & UPF_SPD_MASK) ||
old_custom_divisor != port->custom_divisor) {
/*
printk(KERN_NOTICE
"%s sets custom speed on %s. This "
"is deprecated.\n", current->comm,
- tty_name(state->info->tty, buf));
+ tty_name(state->info.port.tty, buf));
}
uart_change_speed(state, NULL);
}
* interrupt happens).
*/
if (port->x_char ||
- ((uart_circ_chars_pending(&state->info->xmit) > 0) &&
- !state->info->tty->stopped && !state->info->tty->hw_stopped))
+ ((uart_circ_chars_pending(&state->info.xmit) > 0) &&
+ !state->info.port.tty->stopped && !state->info.port.tty->hw_stopped))
result &= ~TIOCSER_TEMT;
return put_user(result, value);
return ret;
}
-static void uart_break_ctl(struct tty_struct *tty, int break_state)
+static int uart_break_ctl(struct tty_struct *tty, int break_state)
{
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
- lock_kernel();
mutex_lock(&state->mutex);
if (port->type != PORT_UNKNOWN)
port->ops->break_ctl(port, break_state);
mutex_unlock(&state->mutex);
- unlock_kernel();
+ return 0;
}
static int uart_do_autoconfig(struct uart_state *state)
port->ops->enable_ms(port);
spin_unlock_irq(&port->lock);
- add_wait_queue(&state->info->delta_msr_wait, &wait);
+ add_wait_queue(&state->info.delta_msr_wait, &wait);
for (;;) {
spin_lock_irq(&port->lock);
memcpy(&cnow, &port->icount, sizeof(struct uart_icount));
}
current->state = TASK_RUNNING;
- remove_wait_queue(&state->info->delta_msr_wait, &wait);
+ remove_wait_queue(&state->info.delta_msr_wait, &wait);
return ret;
}
int ret = -ENOIOCTLCMD;
- lock_kernel();
/*
* These ioctls don't rely on the hardware to be present.
*/
break;
}
}
- out_up:
+out_up:
mutex_unlock(&state->mutex);
- out:
- unlock_kernel();
+out:
return ret;
}
+static void uart_set_ldisc(struct tty_struct *tty)
+{
+ struct uart_state *state = tty->driver_data;
+ struct uart_port *port = state->port;
+
+ if (port->ops->set_ldisc)
+ port->ops->set_ldisc(port);
+}
+
static void uart_set_termios(struct tty_struct *tty,
struct ktermios *old_termios)
{
return;
}
- lock_kernel();
uart_change_speed(state, old_termios);
/* Handle transition to B0 status */
}
spin_unlock_irqrestore(&state->port->lock, flags);
}
- unlock_kernel();
#if 0
/*
* No need to wake up processes in open wait, since they
*/
if (!(old_termios->c_cflag & CLOCAL) &&
(tty->termios->c_cflag & CLOCAL))
- wake_up_interruptible(&state->info->open_wait);
+ wake_up_interruptible(&info->port.open_wait);
#endif
}
* At this point, we stop accepting input. To do this, we
* disable the receive line status interrupts.
*/
- if (state->info->flags & UIF_INITIALIZED) {
+ if (state->info.flags & UIF_INITIALIZED) {
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
port->ops->stop_rx(port);
tty_ldisc_flush(tty);
tty->closing = 0;
- state->info->tty = NULL;
+ state->info.port.tty = NULL;
- if (state->info->blocked_open) {
+ if (state->info.port.blocked_open) {
if (state->close_delay)
msleep_interruptible(state->close_delay);
} else if (!uart_console(port)) {
/*
* Wake up anyone trying to open this port.
*/
- state->info->flags &= ~UIF_NORMAL_ACTIVE;
- wake_up_interruptible(&state->info->open_wait);
+ state->info.flags &= ~UIF_NORMAL_ACTIVE;
+ wake_up_interruptible(&state->info.port.open_wait);
done:
mutex_unlock(&state->mutex);
struct uart_port *port = state->port;
unsigned long char_time, expire;
- BUG_ON(!kernel_locked());
-
if (port->type == PORT_UNKNOWN || port->fifosize == 0)
return;
+ lock_kernel();
+
/*
* Set the check interval to be 1/5 of the estimated time to
* send a single character, and make it at least 1. The check
break;
}
set_current_state(TASK_RUNNING); /* might not be needed */
+ unlock_kernel();
}
/*
static void uart_hangup(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
+ struct uart_info *info = &state->info;
BUG_ON(!kernel_locked());
pr_debug("uart_hangup(%d)\n", state->port->line);
mutex_lock(&state->mutex);
- if (state->info && state->info->flags & UIF_NORMAL_ACTIVE) {
+ if (info->flags & UIF_NORMAL_ACTIVE) {
uart_flush_buffer(tty);
uart_shutdown(state);
state->count = 0;
- state->info->flags &= ~UIF_NORMAL_ACTIVE;
- state->info->tty = NULL;
- wake_up_interruptible(&state->info->open_wait);
- wake_up_interruptible(&state->info->delta_msr_wait);
+ info->flags &= ~UIF_NORMAL_ACTIVE;
+ info->port.tty = NULL;
+ wake_up_interruptible(&info->port.open_wait);
+ wake_up_interruptible(&info->delta_msr_wait);
}
mutex_unlock(&state->mutex);
}
*/
static void uart_update_termios(struct uart_state *state)
{
- struct tty_struct *tty = state->info->tty;
+ struct tty_struct *tty = state->info.port.tty;
struct uart_port *port = state->port;
if (uart_console(port) && port->cons->cflag) {
uart_block_til_ready(struct file *filp, struct uart_state *state)
{
DECLARE_WAITQUEUE(wait, current);
- struct uart_info *info = state->info;
+ struct uart_info *info = &state->info;
struct uart_port *port = state->port;
unsigned int mctrl;
- info->blocked_open++;
+ info->port.blocked_open++;
state->count--;
- add_wait_queue(&info->open_wait, &wait);
+ add_wait_queue(&info->port.open_wait, &wait);
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
/*
* If we have been hung up, tell userspace/restart open.
*/
- if (tty_hung_up_p(filp) || info->tty == NULL)
+ if (tty_hung_up_p(filp) || info->port.tty == NULL)
break;
/*
* have set TTY_IO_ERROR for a non-existant port.
*/
if ((filp->f_flags & O_NONBLOCK) ||
- (info->tty->termios->c_cflag & CLOCAL) ||
- (info->tty->flags & (1 << TTY_IO_ERROR)))
+ (info->port.tty->termios->c_cflag & CLOCAL) ||
+ (info->port.tty->flags & (1 << TTY_IO_ERROR)))
break;
/*
* not set RTS here - we want to make sure we catch
* the data from the modem.
*/
- if (info->tty->termios->c_cflag & CBAUD)
+ if (info->port.tty->termios->c_cflag & CBAUD)
uart_set_mctrl(port, TIOCM_DTR);
/*
break;
}
set_current_state(TASK_RUNNING);
- remove_wait_queue(&info->open_wait, &wait);
+ remove_wait_queue(&info->port.open_wait, &wait);
state->count++;
- info->blocked_open--;
+ info->port.blocked_open--;
if (signal_pending(current))
return -ERESTARTSYS;
- if (!info->tty || tty_hung_up_p(filp))
+ if (!info->port.tty || tty_hung_up_p(filp))
return -EAGAIN;
return 0;
ret = -ENXIO;
goto err_unlock;
}
-
- if (!state->info) {
- state->info = kzalloc(sizeof(struct uart_info), GFP_KERNEL);
- if (state->info) {
- init_waitqueue_head(&state->info->open_wait);
- init_waitqueue_head(&state->info->delta_msr_wait);
-
- /*
- * Link the info into the other structures.
- */
- state->port->info = state->info;
-
- tasklet_init(&state->info->tlet, uart_tasklet_action,
- (unsigned long)state);
- } else {
- ret = -ENOMEM;
- goto err_unlock;
- }
- }
return state;
err_unlock:
* be re-entered while allocating the info structure, or while we
* request any IRQs that the driver may need. This also has the nice
* side-effect that it delays the action of uart_hangup, so we can
- * guarantee that info->tty will always contain something reasonable.
+ * guarantee that info->port.tty will always contain something reasonable.
*/
state = uart_get(drv, line);
if (IS_ERR(state)) {
* Any failures from here onwards should not touch the count.
*/
tty->driver_data = state;
+ state->port->info = &state->info;
tty->low_latency = (state->port->flags & UPF_LOW_LATENCY) ? 1 : 0;
tty->alt_speed = 0;
- state->info->tty = tty;
+ state->info.port.tty = tty;
/*
* If the port is in the middle of closing, bail out now.
/*
* If this is the first open to succeed, adjust things to suit.
*/
- if (retval == 0 && !(state->info->flags & UIF_NORMAL_ACTIVE)) {
- state->info->flags |= UIF_NORMAL_ACTIVE;
+ if (retval == 0 && !(state->info.flags & UIF_NORMAL_ACTIVE)) {
+ state->info.flags |= UIF_NORMAL_ACTIVE;
uart_update_termios(state);
}
static int serial_match_port(struct device *dev, void *data)
{
struct uart_match *match = data;
- dev_t devt = MKDEV(match->driver->major, match->driver->minor) + match->port->line;
+ struct tty_driver *tty_drv = match->driver->tty_driver;
+ dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) +
+ match->port->line;
return dev->devt == devt; /* Actually, only one tty per port */
}
}
port->suspended = 1;
- if (state->info && state->info->flags & UIF_INITIALIZED) {
+ if (state->info.flags & UIF_INITIALIZED) {
const struct uart_ops *ops = port->ops;
int tries;
- state->info->flags = (state->info->flags & ~UIF_INITIALIZED)
+ state->info.flags = (state->info.flags & ~UIF_INITIALIZED)
| UIF_SUSPENDED;
spin_lock_irq(&port->lock);
"transmitter\n",
port->dev ? port->dev->bus_id : "",
port->dev ? ": " : "",
- drv->dev_name, port->line);
+ drv->dev_name,
+ drv->tty_driver->name_base + port->line);
ops->shutdown(port);
}
int uart_resume_port(struct uart_driver *drv, struct uart_port *port)
{
struct uart_state *state = drv->state + port->line;
+ struct device *tty_dev;
+ struct uart_match match = {port, drv};
mutex_lock(&state->mutex);
return 0;
}
- if (!port->suspended) {
+ tty_dev = device_find_child(port->dev, &match, serial_match_port);
+ if (!port->suspended && device_may_wakeup(tty_dev)) {
disable_irq_wake(port->irq);
mutex_unlock(&state->mutex);
return 0;
/*
* If that's unset, use the tty termios setting.
*/
- if (state->info && state->info->tty && termios.c_cflag == 0)
- termios = *state->info->tty->termios;
+ if (state->info.port.tty && termios.c_cflag == 0)
+ termios = *state->info.port.tty->termios;
uart_change_pm(state, 0);
port->ops->set_termios(port, &termios, NULL);
console_start(port->cons);
}
- if (state->info && state->info->flags & UIF_SUSPENDED) {
+ if (state->info.flags & UIF_SUSPENDED) {
const struct uart_ops *ops = port->ops;
int ret;
uart_change_pm(state, 0);
+ spin_lock_irq(&port->lock);
ops->set_mctrl(port, 0);
+ spin_unlock_irq(&port->lock);
ret = ops->startup(port);
if (ret == 0) {
uart_change_speed(state, NULL);
ops->set_mctrl(port, port->mctrl);
ops->start_tx(port);
spin_unlock_irq(&port->lock);
- state->info->flags |= UIF_INITIALIZED;
+ state->info.flags |= UIF_INITIALIZED;
} else {
/*
* Failed to resume - maybe hardware went away?
uart_shutdown(state);
}
- state->info->flags &= ~UIF_SUSPENDED;
+ state->info.flags &= ~UIF_SUSPENDED;
}
mutex_unlock(&state->mutex);
switch (port->iotype) {
case UPIO_PORT:
- snprintf(address, sizeof(address),
- "I/O 0x%x", port->iobase);
+ snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase);
break;
case UPIO_HUB6:
snprintf(address, sizeof(address),
- "I/O 0x%x offset 0x%x", port->iobase, port->hub6);
+ "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
break;
case UPIO_MEM:
case UPIO_MEM32:
printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n",
port->dev ? port->dev->bus_id : "",
port->dev ? ": " : "",
- drv->dev_name, port->line, address, port->irq, uart_type(port));
+ drv->dev_name,
+ drv->tty_driver->name_base + port->line,
+ address, port->irq, uart_type(port));
}
static void
.unthrottle = uart_unthrottle,
.send_xchar = uart_send_xchar,
.set_termios = uart_set_termios,
+ .set_ldisc = uart_set_ldisc,
.stop = uart_stop,
.start = uart_start,
.hangup = uart_hangup,
state->close_delay = 500; /* .5 seconds */
state->closing_wait = 30000; /* 30 seconds */
-
mutex_init(&state->mutex);
+
+ tty_port_init(&state->info.port);
+ init_waitqueue_head(&state->info.delta_msr_wait);
+ tasklet_init(&state->info.tlet, uart_tasklet_action,
+ (unsigned long)state);
}
retval = tty_register_driver(normal);
state->pm_state = -1;
port->cons = drv->cons;
- port->info = state->info;
+ port->info = &state->info;
/*
* If this port is a console, then the spinlock is already
*/
tty_unregister_device(drv->tty_driver, port->line);
- info = state->info;
- if (info && info->tty)
- tty_vhangup(info->tty);
-
- /*
- * All users of this port should now be disconnected from
- * this driver, and the port shut down. We should be the
- * only thread fiddling with this port from now on.
- */
- state->info = NULL;
+ info = &state->info;
+ if (info && info->port.tty)
+ tty_vhangup(info->port.tty);
/*
* Free the port IO and memory resources, if any.
/*
* Kill the tasklet, and free resources.
*/
- if (info) {
+ if (info)
tasklet_kill(&info->tlet);
- kfree(info);
- }
state->port = NULL;
mutex_unlock(&port_mutex);