user/sven/linux.git/Documentation/serial/driver, branch v3.2

Subject: [PATCH 1/2] serial: Add flush_buffer() operation to uart_ops

2008-07-21T00:12:34Z

Serial drivers using DMA (like the atmel_serial driver) tend to get very confused when the xmit buffer is flushed and nobody told them. They also tend to spew a lot of garbage since the DMA engine keeps running after the buffer is flushed and possibly refilled with unrelated data. This patch adds a new flush_buffer operation to the uart_ops struct, along with a call to it from uart_flush_buffer() right after the xmit buffer has been cleared. The driver can implement this in order to syncronize its internal DMA state with the xmit buffer when the buffer is flushed. Signed-off-by: Haavard Skinnemoen Acked-by: Alan Cox Signed-off-by: Linus Torvalds

[SERIAL] Update parity handling documentation

2006-06-02T16:47:26Z

Update documentation to match reality. INPCK controls whether input parity checking is enabled. Signed-off-by: Peter Korsgaard Signed-off-by: Russell King

[SERIAL] Update serial driver documentation

2006-04-15T19:46:11Z

Improve serial driver documentation: - Remove CVS id. - Update pointer to reference driver documentation. - Add comments about new uart_write_console function. - Add TIOCM_LOOP modem control bit description. - Add commentry about enable_ms method being called multiple times. - Add commentry about startup/shutdown method calling. - Mention that dereferencing port->info after shutdown is invalid. Signed-off-by: Russell King

[SERIAL] Update serial_core documentation

2005-10-31T11:53:19Z

Signed-off-by: Russell King

[SERIAL] Clean up and fix tty transmission start/stoping

2005-08-31T09:12:14Z

The start_tx and stop_tx methods were passed a flag to indicate whether the start/stop was from the tty start/stop callbacks, and some drivers used this flag to decide whether to ask the UART to immediately stop transmission (where the UART supports such a feature.) There are other cases when we wish this to occur - when CTS is lowered, or if we change from soft to hard flow control and CTS is inactive. In these cases, this flag was false, and we would allow the transmitter to drain before stopping. There is really only one case where we want to let the transmitter drain before disabling, and that's when we run out of characters to send. Hence, re-jig the start_tx and stop_tx methods to eliminate this flag, and introduce new functions for the special "disable and allow transmitter to drain" case. Signed-off-by: Russell King

[PATCH] Serial: Adjust serial locking

2005-06-29T08:42:38Z

This patch changes the way serial ports are locked when getting modem status. This change is necessary because we will need to atomically read the modem status and take action depending on the CTS status. Signed-off-by: Russell King

[SERIAL] Clarify documentation for set_termios and pm methods.

2005-01-15T11:51:45Z

Signed-off-by: Russell King

[SERIAL] Change settermios to set_termios

2003-01-06T22:31:17Z

set_termios matches the style used for the other methods. It should have been this from the start.

[SERIAL] Convert change_speed() to settermios()

2003-01-03T15:42:09Z

Several serial drivers want to obtain the numeric baud rate when configuring their serial ports. Currently, two methods are used to "work around" this inadequacy in the change_speed API: baud = tty_get_baud_rate(port->info->tty); baud = BAUD_BASE / (16 * quot); Passing the termios structure down means that we can use uart_get_baud_rate() instead. We can also ensure that the various termios flags for options we don't support are correctly set. Lastly, this also provides 8250.c with a clean method for supporting divisors that are greater than the baud_base.

[SERIAL] Locking fixup (part 2)

2002-07-27T12:35:16Z

After the last few days of debugging, we've ended up with the caller of the start_tx and stop_tx methods taking the per-port lock. This cset and the accompanying csets make the same change to some of the other methods for consistency reasons. Since these methods don't contain a lot of code, it is better that they have consistent locking rules. This cset fixes up the enable_ms method.