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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
We need the serial-core fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1042 lines
33 KiB
C
1042 lines
33 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* linux/drivers/char/serial_core.h
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*
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* Copyright (C) 2000 Deep Blue Solutions Ltd.
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*/
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#ifndef LINUX_SERIAL_CORE_H
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#define LINUX_SERIAL_CORE_H
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#include <linux/bitops.h>
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#include <linux/compiler.h>
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#include <linux/console.h>
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#include <linux/interrupt.h>
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#include <linux/circ_buf.h>
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#include <linux/spinlock.h>
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#include <linux/sched.h>
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#include <linux/tty.h>
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#include <linux/mutex.h>
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#include <linux/sysrq.h>
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#include <uapi/linux/serial_core.h>
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#ifdef CONFIG_SERIAL_CORE_CONSOLE
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#define uart_console(port) \
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((port)->cons && (port)->cons->index == (port)->line)
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#else
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#define uart_console(port) ({ (void)port; 0; })
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#endif
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struct uart_port;
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struct serial_struct;
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struct serial_port_device;
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struct device;
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struct gpio_desc;
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/**
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* struct uart_ops -- interface between serial_core and the driver
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*
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* This structure describes all the operations that can be done on the
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* physical hardware.
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*
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* @tx_empty: ``unsigned int ()(struct uart_port *port)``
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*
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* This function tests whether the transmitter fifo and shifter for the
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* @port is empty. If it is empty, this function should return
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* %TIOCSER_TEMT, otherwise return 0. If the port does not support this
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* operation, then it should return %TIOCSER_TEMT.
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*
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* Locking: none.
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* Interrupts: caller dependent.
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* This call must not sleep
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*
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* @set_mctrl: ``void ()(struct uart_port *port, unsigned int mctrl)``
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*
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* This function sets the modem control lines for @port to the state
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* described by @mctrl. The relevant bits of @mctrl are:
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*
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* - %TIOCM_RTS RTS signal.
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* - %TIOCM_DTR DTR signal.
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* - %TIOCM_OUT1 OUT1 signal.
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* - %TIOCM_OUT2 OUT2 signal.
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* - %TIOCM_LOOP Set the port into loopback mode.
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*
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* If the appropriate bit is set, the signal should be driven
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* active. If the bit is clear, the signal should be driven
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* inactive.
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*
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* Locking: @port->lock taken.
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* Interrupts: locally disabled.
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* This call must not sleep
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*
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* @get_mctrl: ``unsigned int ()(struct uart_port *port)``
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*
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* Returns the current state of modem control inputs of @port. The state
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* of the outputs should not be returned, since the core keeps track of
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* their state. The state information should include:
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*
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* - %TIOCM_CAR state of DCD signal
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* - %TIOCM_CTS state of CTS signal
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* - %TIOCM_DSR state of DSR signal
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* - %TIOCM_RI state of RI signal
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*
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* The bit is set if the signal is currently driven active. If
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* the port does not support CTS, DCD or DSR, the driver should
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* indicate that the signal is permanently active. If RI is
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* not available, the signal should not be indicated as active.
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*
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* Locking: @port->lock taken.
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* Interrupts: locally disabled.
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* This call must not sleep
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*
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* @stop_tx: ``void ()(struct uart_port *port)``
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*
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* Stop transmitting characters. This might be due to the CTS line
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* becoming inactive or the tty layer indicating we want to stop
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* transmission due to an %XOFF character.
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*
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* The driver should stop transmitting characters as soon as possible.
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*
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* Locking: @port->lock taken.
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* Interrupts: locally disabled.
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* This call must not sleep
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*
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* @start_tx: ``void ()(struct uart_port *port)``
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*
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* Start transmitting characters.
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*
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* Locking: @port->lock taken.
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* Interrupts: locally disabled.
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* This call must not sleep
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*
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* @throttle: ``void ()(struct uart_port *port)``
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*
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* Notify the serial driver that input buffers for the line discipline are
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* close to full, and it should somehow signal that no more characters
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* should be sent to the serial port.
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* This will be called only if hardware assisted flow control is enabled.
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*
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* Locking: serialized with @unthrottle() and termios modification by the
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* tty layer.
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*
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* @unthrottle: ``void ()(struct uart_port *port)``
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*
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* Notify the serial driver that characters can now be sent to the serial
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* port without fear of overrunning the input buffers of the line
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* disciplines.
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*
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* This will be called only if hardware assisted flow control is enabled.
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*
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* Locking: serialized with @throttle() and termios modification by the
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* tty layer.
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*
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* @send_xchar: ``void ()(struct uart_port *port, char ch)``
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*
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* Transmit a high priority character, even if the port is stopped. This
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* is used to implement XON/XOFF flow control and tcflow(). If the serial
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* driver does not implement this function, the tty core will append the
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* character to the circular buffer and then call start_tx() / stop_tx()
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* to flush the data out.
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*
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* Do not transmit if @ch == '\0' (%__DISABLED_CHAR).
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*
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* Locking: none.
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* Interrupts: caller dependent.
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*
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* @start_rx: ``void ()(struct uart_port *port)``
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*
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* Start receiving characters.
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*
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* Locking: @port->lock taken.
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* Interrupts: locally disabled.
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* This call must not sleep
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*
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* @stop_rx: ``void ()(struct uart_port *port)``
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*
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* Stop receiving characters; the @port is in the process of being closed.
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*
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* Locking: @port->lock taken.
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* Interrupts: locally disabled.
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* This call must not sleep
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*
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* @enable_ms: ``void ()(struct uart_port *port)``
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*
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* Enable the modem status interrupts.
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*
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* This method may be called multiple times. Modem status interrupts
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* should be disabled when the @shutdown() method is called.
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*
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* Locking: @port->lock taken.
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* Interrupts: locally disabled.
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* This call must not sleep
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*
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* @break_ctl: ``void ()(struct uart_port *port, int ctl)``
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*
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* Control the transmission of a break signal. If @ctl is nonzero, the
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* break signal should be transmitted. The signal should be terminated
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* when another call is made with a zero @ctl.
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*
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* Locking: caller holds tty_port->mutex
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*
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* @startup: ``int ()(struct uart_port *port)``
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*
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* Grab any interrupt resources and initialise any low level driver state.
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* Enable the port for reception. It should not activate RTS nor DTR;
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* this will be done via a separate call to @set_mctrl().
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*
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* This method will only be called when the port is initially opened.
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*
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* Locking: port_sem taken.
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* Interrupts: globally disabled.
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*
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* @shutdown: ``void ()(struct uart_port *port)``
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*
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* Disable the @port, disable any break condition that may be in effect,
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* and free any interrupt resources. It should not disable RTS nor DTR;
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* this will have already been done via a separate call to @set_mctrl().
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*
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* Drivers must not access @port->state once this call has completed.
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*
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* This method will only be called when there are no more users of this
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* @port.
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*
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* Locking: port_sem taken.
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* Interrupts: caller dependent.
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*
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* @flush_buffer: ``void ()(struct uart_port *port)``
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*
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* Flush any write buffers, reset any DMA state and stop any ongoing DMA
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* transfers.
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*
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* This will be called whenever the @port->state->xmit circular buffer is
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* cleared.
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*
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* Locking: @port->lock taken.
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* Interrupts: locally disabled.
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* This call must not sleep
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*
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* @set_termios: ``void ()(struct uart_port *port, struct ktermios *new,
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* struct ktermios *old)``
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*
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* Change the @port parameters, including word length, parity, stop bits.
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* Update @port->read_status_mask and @port->ignore_status_mask to
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* indicate the types of events we are interested in receiving. Relevant
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* ktermios::c_cflag bits are:
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*
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* - %CSIZE - word size
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* - %CSTOPB - 2 stop bits
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* - %PARENB - parity enable
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* - %PARODD - odd parity (when %PARENB is in force)
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* - %ADDRB - address bit (changed through uart_port::rs485_config()).
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* - %CREAD - enable reception of characters (if not set, still receive
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* characters from the port, but throw them away).
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* - %CRTSCTS - if set, enable CTS status change reporting.
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* - %CLOCAL - if not set, enable modem status change reporting.
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*
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* Relevant ktermios::c_iflag bits are:
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*
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* - %INPCK - enable frame and parity error events to be passed to the TTY
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* layer.
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* - %BRKINT / %PARMRK - both of these enable break events to be passed to
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* the TTY layer.
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* - %IGNPAR - ignore parity and framing errors.
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* - %IGNBRK - ignore break errors. If %IGNPAR is also set, ignore overrun
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* errors as well.
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*
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* The interaction of the ktermios::c_iflag bits is as follows (parity
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* error given as an example):
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*
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* ============ ======= ======= =========================================
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* Parity error INPCK IGNPAR
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* ============ ======= ======= =========================================
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* n/a 0 n/a character received, marked as %TTY_NORMAL
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* None 1 n/a character received, marked as %TTY_NORMAL
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* Yes 1 0 character received, marked as %TTY_PARITY
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* Yes 1 1 character discarded
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* ============ ======= ======= =========================================
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*
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* Other flags may be used (eg, xon/xoff characters) if your hardware
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* supports hardware "soft" flow control.
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*
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* Locking: caller holds tty_port->mutex
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* Interrupts: caller dependent.
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* This call must not sleep
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*
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* @set_ldisc: ``void ()(struct uart_port *port, struct ktermios *termios)``
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*
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* Notifier for discipline change. See
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* Documentation/driver-api/tty/tty_ldisc.rst.
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*
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* Locking: caller holds tty_port->mutex
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*
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* @pm: ``void ()(struct uart_port *port, unsigned int state,
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* unsigned int oldstate)``
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*
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* Perform any power management related activities on the specified @port.
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* @state indicates the new state (defined by enum uart_pm_state),
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* @oldstate indicates the previous state.
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*
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* This function should not be used to grab any resources.
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*
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* This will be called when the @port is initially opened and finally
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* closed, except when the @port is also the system console. This will
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* occur even if %CONFIG_PM is not set.
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*
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* Locking: none.
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* Interrupts: caller dependent.
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*
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* @type: ``const char *()(struct uart_port *port)``
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*
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* Return a pointer to a string constant describing the specified @port,
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* or return %NULL, in which case the string 'unknown' is substituted.
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*
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* Locking: none.
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* Interrupts: caller dependent.
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*
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* @release_port: ``void ()(struct uart_port *port)``
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*
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* Release any memory and IO region resources currently in use by the
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* @port.
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*
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* Locking: none.
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* Interrupts: caller dependent.
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*
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* @request_port: ``int ()(struct uart_port *port)``
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*
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* Request any memory and IO region resources required by the port. If any
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* fail, no resources should be registered when this function returns, and
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* it should return -%EBUSY on failure.
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*
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* Locking: none.
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* Interrupts: caller dependent.
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*
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* @config_port: ``void ()(struct uart_port *port, int type)``
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*
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* Perform any autoconfiguration steps required for the @port. @type
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* contains a bit mask of the required configuration. %UART_CONFIG_TYPE
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* indicates that the port requires detection and identification.
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* @port->type should be set to the type found, or %PORT_UNKNOWN if no
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* port was detected.
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*
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* %UART_CONFIG_IRQ indicates autoconfiguration of the interrupt signal,
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* which should be probed using standard kernel autoprobing techniques.
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* This is not necessary on platforms where ports have interrupts
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* internally hard wired (eg, system on a chip implementations).
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*
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* Locking: none.
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* Interrupts: caller dependent.
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*
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* @verify_port: ``int ()(struct uart_port *port,
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* struct serial_struct *serinfo)``
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*
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* Verify the new serial port information contained within @serinfo is
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* suitable for this port type.
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*
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* Locking: none.
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* Interrupts: caller dependent.
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*
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* @ioctl: ``int ()(struct uart_port *port, unsigned int cmd,
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* unsigned long arg)``
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*
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* Perform any port specific IOCTLs. IOCTL commands must be defined using
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* the standard numbering system found in <asm/ioctl.h>.
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*
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* Locking: none.
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* Interrupts: caller dependent.
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*
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* @poll_init: ``int ()(struct uart_port *port)``
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*
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* Called by kgdb to perform the minimal hardware initialization needed to
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* support @poll_put_char() and @poll_get_char(). Unlike @startup(), this
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* should not request interrupts.
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*
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* Locking: %tty_mutex and tty_port->mutex taken.
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* Interrupts: n/a.
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*
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* @poll_put_char: ``void ()(struct uart_port *port, unsigned char ch)``
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*
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* Called by kgdb to write a single character @ch directly to the serial
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* @port. It can and should block until there is space in the TX FIFO.
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*
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* Locking: none.
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* Interrupts: caller dependent.
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* This call must not sleep
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*
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* @poll_get_char: ``int ()(struct uart_port *port)``
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*
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* Called by kgdb to read a single character directly from the serial
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* port. If data is available, it should be returned; otherwise the
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* function should return %NO_POLL_CHAR immediately.
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*
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* Locking: none.
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* Interrupts: caller dependent.
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* This call must not sleep
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*/
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struct uart_ops {
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unsigned int (*tx_empty)(struct uart_port *);
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void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
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unsigned int (*get_mctrl)(struct uart_port *);
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void (*stop_tx)(struct uart_port *);
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void (*start_tx)(struct uart_port *);
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void (*throttle)(struct uart_port *);
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void (*unthrottle)(struct uart_port *);
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void (*send_xchar)(struct uart_port *, char ch);
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void (*stop_rx)(struct uart_port *);
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void (*start_rx)(struct uart_port *);
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void (*enable_ms)(struct uart_port *);
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void (*break_ctl)(struct uart_port *, int ctl);
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int (*startup)(struct uart_port *);
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void (*shutdown)(struct uart_port *);
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void (*flush_buffer)(struct uart_port *);
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void (*set_termios)(struct uart_port *, struct ktermios *new,
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const struct ktermios *old);
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void (*set_ldisc)(struct uart_port *, struct ktermios *);
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void (*pm)(struct uart_port *, unsigned int state,
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unsigned int oldstate);
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const char *(*type)(struct uart_port *);
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void (*release_port)(struct uart_port *);
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int (*request_port)(struct uart_port *);
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void (*config_port)(struct uart_port *, int);
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int (*verify_port)(struct uart_port *, struct serial_struct *);
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int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
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#ifdef CONFIG_CONSOLE_POLL
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int (*poll_init)(struct uart_port *);
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void (*poll_put_char)(struct uart_port *, unsigned char);
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int (*poll_get_char)(struct uart_port *);
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#endif
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};
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#define NO_POLL_CHAR 0x00ff0000
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#define UART_CONFIG_TYPE (1 << 0)
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#define UART_CONFIG_IRQ (1 << 1)
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struct uart_icount {
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__u32 cts;
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__u32 dsr;
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__u32 rng;
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__u32 dcd;
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__u32 rx;
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__u32 tx;
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__u32 frame;
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__u32 overrun;
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__u32 parity;
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__u32 brk;
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__u32 buf_overrun;
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};
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typedef u64 __bitwise upf_t;
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typedef unsigned int __bitwise upstat_t;
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struct uart_port {
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spinlock_t lock; /* port lock */
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unsigned long iobase; /* in/out[bwl] */
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unsigned char __iomem *membase; /* read/write[bwl] */
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unsigned int (*serial_in)(struct uart_port *, int);
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void (*serial_out)(struct uart_port *, int, int);
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void (*set_termios)(struct uart_port *,
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struct ktermios *new,
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const struct ktermios *old);
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void (*set_ldisc)(struct uart_port *,
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struct ktermios *);
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unsigned int (*get_mctrl)(struct uart_port *);
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void (*set_mctrl)(struct uart_port *, unsigned int);
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unsigned int (*get_divisor)(struct uart_port *,
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unsigned int baud,
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unsigned int *frac);
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void (*set_divisor)(struct uart_port *,
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unsigned int baud,
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unsigned int quot,
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unsigned int quot_frac);
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int (*startup)(struct uart_port *port);
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void (*shutdown)(struct uart_port *port);
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void (*throttle)(struct uart_port *port);
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void (*unthrottle)(struct uart_port *port);
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int (*handle_irq)(struct uart_port *);
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void (*pm)(struct uart_port *, unsigned int state,
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unsigned int old);
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void (*handle_break)(struct uart_port *);
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int (*rs485_config)(struct uart_port *,
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struct ktermios *termios,
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struct serial_rs485 *rs485);
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int (*iso7816_config)(struct uart_port *,
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struct serial_iso7816 *iso7816);
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unsigned int ctrl_id; /* optional serial core controller id */
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unsigned int port_id; /* optional serial core port id */
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unsigned int irq; /* irq number */
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unsigned long irqflags; /* irq flags */
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unsigned int uartclk; /* base uart clock */
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unsigned int fifosize; /* tx fifo size */
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unsigned char x_char; /* xon/xoff char */
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unsigned char regshift; /* reg offset shift */
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unsigned char iotype; /* io access style */
|
|
unsigned char quirks; /* internal quirks */
|
|
|
|
#define UPIO_PORT (SERIAL_IO_PORT) /* 8b I/O port access */
|
|
#define UPIO_HUB6 (SERIAL_IO_HUB6) /* Hub6 ISA card */
|
|
#define UPIO_MEM (SERIAL_IO_MEM) /* driver-specific */
|
|
#define UPIO_MEM32 (SERIAL_IO_MEM32) /* 32b little endian */
|
|
#define UPIO_AU (SERIAL_IO_AU) /* Au1x00 and RT288x type IO */
|
|
#define UPIO_TSI (SERIAL_IO_TSI) /* Tsi108/109 type IO */
|
|
#define UPIO_MEM32BE (SERIAL_IO_MEM32BE) /* 32b big endian */
|
|
#define UPIO_MEM16 (SERIAL_IO_MEM16) /* 16b little endian */
|
|
|
|
/* quirks must be updated while holding port mutex */
|
|
#define UPQ_NO_TXEN_TEST BIT(0)
|
|
|
|
unsigned int read_status_mask; /* driver specific */
|
|
unsigned int ignore_status_mask; /* driver specific */
|
|
struct uart_state *state; /* pointer to parent state */
|
|
struct uart_icount icount; /* statistics */
|
|
|
|
struct console *cons; /* struct console, if any */
|
|
/* flags must be updated while holding port mutex */
|
|
upf_t flags;
|
|
|
|
/*
|
|
* These flags must be equivalent to the flags defined in
|
|
* include/uapi/linux/tty_flags.h which are the userspace definitions
|
|
* assigned from the serial_struct flags in uart_set_info()
|
|
* [for bit definitions in the UPF_CHANGE_MASK]
|
|
*
|
|
* Bits [0..ASYNCB_LAST_USER] are userspace defined/visible/changeable
|
|
* The remaining bits are serial-core specific and not modifiable by
|
|
* userspace.
|
|
*/
|
|
#define UPF_FOURPORT ((__force upf_t) ASYNC_FOURPORT /* 1 */ )
|
|
#define UPF_SAK ((__force upf_t) ASYNC_SAK /* 2 */ )
|
|
#define UPF_SPD_HI ((__force upf_t) ASYNC_SPD_HI /* 4 */ )
|
|
#define UPF_SPD_VHI ((__force upf_t) ASYNC_SPD_VHI /* 5 */ )
|
|
#define UPF_SPD_CUST ((__force upf_t) ASYNC_SPD_CUST /* 0x0030 */ )
|
|
#define UPF_SPD_WARP ((__force upf_t) ASYNC_SPD_WARP /* 0x1010 */ )
|
|
#define UPF_SPD_MASK ((__force upf_t) ASYNC_SPD_MASK /* 0x1030 */ )
|
|
#define UPF_SKIP_TEST ((__force upf_t) ASYNC_SKIP_TEST /* 6 */ )
|
|
#define UPF_AUTO_IRQ ((__force upf_t) ASYNC_AUTO_IRQ /* 7 */ )
|
|
#define UPF_HARDPPS_CD ((__force upf_t) ASYNC_HARDPPS_CD /* 11 */ )
|
|
#define UPF_SPD_SHI ((__force upf_t) ASYNC_SPD_SHI /* 12 */ )
|
|
#define UPF_LOW_LATENCY ((__force upf_t) ASYNC_LOW_LATENCY /* 13 */ )
|
|
#define UPF_BUGGY_UART ((__force upf_t) ASYNC_BUGGY_UART /* 14 */ )
|
|
#define UPF_MAGIC_MULTIPLIER ((__force upf_t) ASYNC_MAGIC_MULTIPLIER /* 16 */ )
|
|
|
|
#define UPF_NO_THRE_TEST ((__force upf_t) BIT_ULL(19))
|
|
/* Port has hardware-assisted h/w flow control */
|
|
#define UPF_AUTO_CTS ((__force upf_t) BIT_ULL(20))
|
|
#define UPF_AUTO_RTS ((__force upf_t) BIT_ULL(21))
|
|
#define UPF_HARD_FLOW ((__force upf_t) (UPF_AUTO_CTS | UPF_AUTO_RTS))
|
|
/* Port has hardware-assisted s/w flow control */
|
|
#define UPF_SOFT_FLOW ((__force upf_t) BIT_ULL(22))
|
|
#define UPF_CONS_FLOW ((__force upf_t) BIT_ULL(23))
|
|
#define UPF_SHARE_IRQ ((__force upf_t) BIT_ULL(24))
|
|
#define UPF_EXAR_EFR ((__force upf_t) BIT_ULL(25))
|
|
#define UPF_BUG_THRE ((__force upf_t) BIT_ULL(26))
|
|
/* The exact UART type is known and should not be probed. */
|
|
#define UPF_FIXED_TYPE ((__force upf_t) BIT_ULL(27))
|
|
#define UPF_BOOT_AUTOCONF ((__force upf_t) BIT_ULL(28))
|
|
#define UPF_FIXED_PORT ((__force upf_t) BIT_ULL(29))
|
|
#define UPF_DEAD ((__force upf_t) BIT_ULL(30))
|
|
#define UPF_IOREMAP ((__force upf_t) BIT_ULL(31))
|
|
#define UPF_FULL_PROBE ((__force upf_t) BIT_ULL(32))
|
|
|
|
#define __UPF_CHANGE_MASK 0x17fff
|
|
#define UPF_CHANGE_MASK ((__force upf_t) __UPF_CHANGE_MASK)
|
|
#define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
|
|
|
|
#if __UPF_CHANGE_MASK > ASYNC_FLAGS
|
|
#error Change mask not equivalent to userspace-visible bit defines
|
|
#endif
|
|
|
|
/*
|
|
* Must hold termios_rwsem, port mutex and port lock to change;
|
|
* can hold any one lock to read.
|
|
*/
|
|
upstat_t status;
|
|
|
|
#define UPSTAT_CTS_ENABLE ((__force upstat_t) (1 << 0))
|
|
#define UPSTAT_DCD_ENABLE ((__force upstat_t) (1 << 1))
|
|
#define UPSTAT_AUTORTS ((__force upstat_t) (1 << 2))
|
|
#define UPSTAT_AUTOCTS ((__force upstat_t) (1 << 3))
|
|
#define UPSTAT_AUTOXOFF ((__force upstat_t) (1 << 4))
|
|
#define UPSTAT_SYNC_FIFO ((__force upstat_t) (1 << 5))
|
|
|
|
bool hw_stopped; /* sw-assisted CTS flow state */
|
|
unsigned int mctrl; /* current modem ctrl settings */
|
|
unsigned int frame_time; /* frame timing in ns */
|
|
unsigned int type; /* port type */
|
|
const struct uart_ops *ops;
|
|
unsigned int custom_divisor;
|
|
unsigned int line; /* port index */
|
|
unsigned int minor;
|
|
resource_size_t mapbase; /* for ioremap */
|
|
resource_size_t mapsize;
|
|
struct device *dev; /* serial port physical parent device */
|
|
struct serial_port_device *port_dev; /* serial core port device */
|
|
|
|
unsigned long sysrq; /* sysrq timeout */
|
|
u8 sysrq_ch; /* char for sysrq */
|
|
unsigned char has_sysrq;
|
|
unsigned char sysrq_seq; /* index in sysrq_toggle_seq */
|
|
|
|
unsigned char hub6; /* this should be in the 8250 driver */
|
|
unsigned char suspended;
|
|
unsigned char console_reinit;
|
|
const char *name; /* port name */
|
|
struct attribute_group *attr_group; /* port specific attributes */
|
|
const struct attribute_group **tty_groups; /* all attributes (serial core use only) */
|
|
struct serial_rs485 rs485;
|
|
struct serial_rs485 rs485_supported; /* Supported mask for serial_rs485 */
|
|
struct gpio_desc *rs485_term_gpio; /* enable RS485 bus termination */
|
|
struct gpio_desc *rs485_rx_during_tx_gpio; /* Output GPIO that sets the state of RS485 RX during TX */
|
|
struct serial_iso7816 iso7816;
|
|
void *private_data; /* generic platform data pointer */
|
|
};
|
|
|
|
static inline int serial_port_in(struct uart_port *up, int offset)
|
|
{
|
|
return up->serial_in(up, offset);
|
|
}
|
|
|
|
static inline void serial_port_out(struct uart_port *up, int offset, int value)
|
|
{
|
|
up->serial_out(up, offset, value);
|
|
}
|
|
|
|
/**
|
|
* enum uart_pm_state - power states for UARTs
|
|
* @UART_PM_STATE_ON: UART is powered, up and operational
|
|
* @UART_PM_STATE_OFF: UART is powered off
|
|
* @UART_PM_STATE_UNDEFINED: sentinel
|
|
*/
|
|
enum uart_pm_state {
|
|
UART_PM_STATE_ON = 0,
|
|
UART_PM_STATE_OFF = 3, /* number taken from ACPI */
|
|
UART_PM_STATE_UNDEFINED,
|
|
};
|
|
|
|
/*
|
|
* This is the state information which is persistent across opens.
|
|
*/
|
|
struct uart_state {
|
|
struct tty_port port;
|
|
|
|
enum uart_pm_state pm_state;
|
|
struct circ_buf xmit;
|
|
|
|
atomic_t refcount;
|
|
wait_queue_head_t remove_wait;
|
|
struct uart_port *uart_port;
|
|
};
|
|
|
|
#define UART_XMIT_SIZE PAGE_SIZE
|
|
|
|
|
|
/* number of characters left in xmit buffer before we ask for more */
|
|
#define WAKEUP_CHARS 256
|
|
|
|
/**
|
|
* uart_xmit_advance - Advance xmit buffer and account Tx'ed chars
|
|
* @up: uart_port structure describing the port
|
|
* @chars: number of characters sent
|
|
*
|
|
* This function advances the tail of circular xmit buffer by the number of
|
|
* @chars transmitted and handles accounting of transmitted bytes (into
|
|
* @up's icount.tx).
|
|
*/
|
|
static inline void uart_xmit_advance(struct uart_port *up, unsigned int chars)
|
|
{
|
|
struct circ_buf *xmit = &up->state->xmit;
|
|
|
|
xmit->tail = (xmit->tail + chars) & (UART_XMIT_SIZE - 1);
|
|
up->icount.tx += chars;
|
|
}
|
|
|
|
struct module;
|
|
struct tty_driver;
|
|
|
|
struct uart_driver {
|
|
struct module *owner;
|
|
const char *driver_name;
|
|
const char *dev_name;
|
|
int major;
|
|
int minor;
|
|
int nr;
|
|
struct console *cons;
|
|
|
|
/*
|
|
* these are private; the low level driver should not
|
|
* touch these; they should be initialised to NULL
|
|
*/
|
|
struct uart_state *state;
|
|
struct tty_driver *tty_driver;
|
|
};
|
|
|
|
void uart_write_wakeup(struct uart_port *port);
|
|
|
|
#define __uart_port_tx(uport, ch, tx_ready, put_char, tx_done, for_test, \
|
|
for_post) \
|
|
({ \
|
|
struct uart_port *__port = (uport); \
|
|
struct circ_buf *xmit = &__port->state->xmit; \
|
|
unsigned int pending; \
|
|
\
|
|
for (; (for_test) && (tx_ready); (for_post), __port->icount.tx++) { \
|
|
if (__port->x_char) { \
|
|
(ch) = __port->x_char; \
|
|
(put_char); \
|
|
__port->x_char = 0; \
|
|
continue; \
|
|
} \
|
|
\
|
|
if (uart_circ_empty(xmit) || uart_tx_stopped(__port)) \
|
|
break; \
|
|
\
|
|
(ch) = xmit->buf[xmit->tail]; \
|
|
(put_char); \
|
|
xmit->tail = (xmit->tail + 1) % UART_XMIT_SIZE; \
|
|
} \
|
|
\
|
|
(tx_done); \
|
|
\
|
|
pending = uart_circ_chars_pending(xmit); \
|
|
if (pending < WAKEUP_CHARS) { \
|
|
uart_write_wakeup(__port); \
|
|
\
|
|
if (pending == 0) \
|
|
__port->ops->stop_tx(__port); \
|
|
} \
|
|
\
|
|
pending; \
|
|
})
|
|
|
|
/**
|
|
* uart_port_tx_limited -- transmit helper for uart_port with count limiting
|
|
* @port: uart port
|
|
* @ch: variable to store a character to be written to the HW
|
|
* @count: a limit of characters to send
|
|
* @tx_ready: can HW accept more data function
|
|
* @put_char: function to write a character
|
|
* @tx_done: function to call after the loop is done
|
|
*
|
|
* This helper transmits characters from the xmit buffer to the hardware using
|
|
* @put_char(). It does so until @count characters are sent and while @tx_ready
|
|
* evaluates to true.
|
|
*
|
|
* Returns: the number of characters in the xmit buffer when done.
|
|
*
|
|
* The expression in macro parameters shall be designed as follows:
|
|
* * **tx_ready:** should evaluate to true if the HW can accept more data to
|
|
* be sent. This parameter can be %true, which means the HW is always ready.
|
|
* * **put_char:** shall write @ch to the device of @port.
|
|
* * **tx_done:** when the write loop is done, this can perform arbitrary
|
|
* action before potential invocation of ops->stop_tx() happens. If the
|
|
* driver does not need to do anything, use e.g. ({}).
|
|
*
|
|
* For all of them, @port->lock is held, interrupts are locally disabled and
|
|
* the expressions must not sleep.
|
|
*/
|
|
#define uart_port_tx_limited(port, ch, count, tx_ready, put_char, tx_done) ({ \
|
|
unsigned int __count = (count); \
|
|
__uart_port_tx(port, ch, tx_ready, put_char, tx_done, __count, \
|
|
__count--); \
|
|
})
|
|
|
|
/**
|
|
* uart_port_tx -- transmit helper for uart_port
|
|
* @port: uart port
|
|
* @ch: variable to store a character to be written to the HW
|
|
* @tx_ready: can HW accept more data function
|
|
* @put_char: function to write a character
|
|
*
|
|
* See uart_port_tx_limited() for more details.
|
|
*/
|
|
#define uart_port_tx(port, ch, tx_ready, put_char) \
|
|
__uart_port_tx(port, ch, tx_ready, put_char, ({}), true, ({}))
|
|
|
|
/*
|
|
* Baud rate helpers.
|
|
*/
|
|
void uart_update_timeout(struct uart_port *port, unsigned int cflag,
|
|
unsigned int baud);
|
|
unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
|
|
const struct ktermios *old, unsigned int min,
|
|
unsigned int max);
|
|
unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
|
|
|
|
/*
|
|
* Calculates FIFO drain time.
|
|
*/
|
|
static inline unsigned long uart_fifo_timeout(struct uart_port *port)
|
|
{
|
|
u64 fifo_timeout = (u64)READ_ONCE(port->frame_time) * port->fifosize;
|
|
|
|
/* Add .02 seconds of slop */
|
|
fifo_timeout += 20 * NSEC_PER_MSEC;
|
|
|
|
return max(nsecs_to_jiffies(fifo_timeout), 1UL);
|
|
}
|
|
|
|
/* Base timer interval for polling */
|
|
static inline int uart_poll_timeout(struct uart_port *port)
|
|
{
|
|
int timeout = uart_fifo_timeout(port);
|
|
|
|
return timeout > 6 ? (timeout / 2 - 2) : 1;
|
|
}
|
|
|
|
/*
|
|
* Console helpers.
|
|
*/
|
|
struct earlycon_device {
|
|
struct console *con;
|
|
struct uart_port port;
|
|
char options[32]; /* e.g., 115200n8 */
|
|
unsigned int baud;
|
|
};
|
|
|
|
struct earlycon_id {
|
|
char name[15];
|
|
char name_term; /* In case compiler didn't '\0' term name */
|
|
char compatible[128];
|
|
int (*setup)(struct earlycon_device *, const char *options);
|
|
};
|
|
|
|
extern const struct earlycon_id __earlycon_table[];
|
|
extern const struct earlycon_id __earlycon_table_end[];
|
|
|
|
#if defined(CONFIG_SERIAL_EARLYCON) && !defined(MODULE)
|
|
#define EARLYCON_USED_OR_UNUSED __used
|
|
#else
|
|
#define EARLYCON_USED_OR_UNUSED __maybe_unused
|
|
#endif
|
|
|
|
#define OF_EARLYCON_DECLARE(_name, compat, fn) \
|
|
static const struct earlycon_id __UNIQUE_ID(__earlycon_##_name) \
|
|
EARLYCON_USED_OR_UNUSED __section("__earlycon_table") \
|
|
__aligned(__alignof__(struct earlycon_id)) \
|
|
= { .name = __stringify(_name), \
|
|
.compatible = compat, \
|
|
.setup = fn }
|
|
|
|
#define EARLYCON_DECLARE(_name, fn) OF_EARLYCON_DECLARE(_name, "", fn)
|
|
|
|
int of_setup_earlycon(const struct earlycon_id *match, unsigned long node,
|
|
const char *options);
|
|
|
|
#ifdef CONFIG_SERIAL_EARLYCON
|
|
extern bool earlycon_acpi_spcr_enable __initdata;
|
|
int setup_earlycon(char *buf);
|
|
#else
|
|
static const bool earlycon_acpi_spcr_enable EARLYCON_USED_OR_UNUSED;
|
|
static inline int setup_earlycon(char *buf) { return 0; }
|
|
#endif
|
|
|
|
/* Variant of uart_console_registered() when the console_list_lock is held. */
|
|
static inline bool uart_console_registered_locked(struct uart_port *port)
|
|
{
|
|
return uart_console(port) && console_is_registered_locked(port->cons);
|
|
}
|
|
|
|
static inline bool uart_console_registered(struct uart_port *port)
|
|
{
|
|
return uart_console(port) && console_is_registered(port->cons);
|
|
}
|
|
|
|
struct uart_port *uart_get_console(struct uart_port *ports, int nr,
|
|
struct console *c);
|
|
int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
|
|
char **options);
|
|
void uart_parse_options(const char *options, int *baud, int *parity, int *bits,
|
|
int *flow);
|
|
int uart_set_options(struct uart_port *port, struct console *co, int baud,
|
|
int parity, int bits, int flow);
|
|
struct tty_driver *uart_console_device(struct console *co, int *index);
|
|
void uart_console_write(struct uart_port *port, const char *s,
|
|
unsigned int count,
|
|
void (*putchar)(struct uart_port *, unsigned char));
|
|
|
|
/*
|
|
* Port/driver registration/removal
|
|
*/
|
|
int uart_register_driver(struct uart_driver *uart);
|
|
void uart_unregister_driver(struct uart_driver *uart);
|
|
int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
|
|
void uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
|
|
bool uart_match_port(const struct uart_port *port1,
|
|
const struct uart_port *port2);
|
|
|
|
/*
|
|
* Power Management
|
|
*/
|
|
int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
|
|
int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
|
|
|
|
#define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
|
|
#define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
|
|
|
|
#define uart_circ_chars_pending(circ) \
|
|
(CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
|
|
|
|
#define uart_circ_chars_free(circ) \
|
|
(CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
|
|
|
|
static inline int uart_tx_stopped(struct uart_port *port)
|
|
{
|
|
struct tty_struct *tty = port->state->port.tty;
|
|
if ((tty && tty->flow.stopped) || port->hw_stopped)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static inline bool uart_cts_enabled(struct uart_port *uport)
|
|
{
|
|
return !!(uport->status & UPSTAT_CTS_ENABLE);
|
|
}
|
|
|
|
static inline bool uart_softcts_mode(struct uart_port *uport)
|
|
{
|
|
upstat_t mask = UPSTAT_CTS_ENABLE | UPSTAT_AUTOCTS;
|
|
|
|
return ((uport->status & mask) == UPSTAT_CTS_ENABLE);
|
|
}
|
|
|
|
/*
|
|
* The following are helper functions for the low level drivers.
|
|
*/
|
|
|
|
void uart_handle_dcd_change(struct uart_port *uport, bool active);
|
|
void uart_handle_cts_change(struct uart_port *uport, bool active);
|
|
|
|
void uart_insert_char(struct uart_port *port, unsigned int status,
|
|
unsigned int overrun, u8 ch, u8 flag);
|
|
|
|
void uart_xchar_out(struct uart_port *uport, int offset);
|
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ_SERIAL
|
|
#define SYSRQ_TIMEOUT (HZ * 5)
|
|
|
|
bool uart_try_toggle_sysrq(struct uart_port *port, u8 ch);
|
|
|
|
static inline int uart_handle_sysrq_char(struct uart_port *port, u8 ch)
|
|
{
|
|
if (!port->sysrq)
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|
return 0;
|
|
|
|
if (ch && time_before(jiffies, port->sysrq)) {
|
|
if (sysrq_mask()) {
|
|
handle_sysrq(ch);
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|
port->sysrq = 0;
|
|
return 1;
|
|
}
|
|
if (uart_try_toggle_sysrq(port, ch))
|
|
return 1;
|
|
}
|
|
port->sysrq = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int uart_prepare_sysrq_char(struct uart_port *port, u8 ch)
|
|
{
|
|
if (!port->sysrq)
|
|
return 0;
|
|
|
|
if (ch && time_before(jiffies, port->sysrq)) {
|
|
if (sysrq_mask()) {
|
|
port->sysrq_ch = ch;
|
|
port->sysrq = 0;
|
|
return 1;
|
|
}
|
|
if (uart_try_toggle_sysrq(port, ch))
|
|
return 1;
|
|
}
|
|
port->sysrq = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void uart_unlock_and_check_sysrq(struct uart_port *port)
|
|
{
|
|
u8 sysrq_ch;
|
|
|
|
if (!port->has_sysrq) {
|
|
spin_unlock(&port->lock);
|
|
return;
|
|
}
|
|
|
|
sysrq_ch = port->sysrq_ch;
|
|
port->sysrq_ch = 0;
|
|
|
|
spin_unlock(&port->lock);
|
|
|
|
if (sysrq_ch)
|
|
handle_sysrq(sysrq_ch);
|
|
}
|
|
|
|
static inline void uart_unlock_and_check_sysrq_irqrestore(struct uart_port *port,
|
|
unsigned long flags)
|
|
{
|
|
u8 sysrq_ch;
|
|
|
|
if (!port->has_sysrq) {
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
return;
|
|
}
|
|
|
|
sysrq_ch = port->sysrq_ch;
|
|
port->sysrq_ch = 0;
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
if (sysrq_ch)
|
|
handle_sysrq(sysrq_ch);
|
|
}
|
|
#else /* CONFIG_MAGIC_SYSRQ_SERIAL */
|
|
static inline int uart_handle_sysrq_char(struct uart_port *port, u8 ch)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int uart_prepare_sysrq_char(struct uart_port *port, u8 ch)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void uart_unlock_and_check_sysrq(struct uart_port *port)
|
|
{
|
|
spin_unlock(&port->lock);
|
|
}
|
|
static inline void uart_unlock_and_check_sysrq_irqrestore(struct uart_port *port,
|
|
unsigned long flags)
|
|
{
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
}
|
|
#endif /* CONFIG_MAGIC_SYSRQ_SERIAL */
|
|
|
|
/*
|
|
* We do the SysRQ and SAK checking like this...
|
|
*/
|
|
static inline int uart_handle_break(struct uart_port *port)
|
|
{
|
|
struct uart_state *state = port->state;
|
|
|
|
if (port->handle_break)
|
|
port->handle_break(port);
|
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ_SERIAL
|
|
if (port->has_sysrq && uart_console(port)) {
|
|
if (!port->sysrq) {
|
|
port->sysrq = jiffies + SYSRQ_TIMEOUT;
|
|
return 1;
|
|
}
|
|
port->sysrq = 0;
|
|
}
|
|
#endif
|
|
if (port->flags & UPF_SAK)
|
|
do_SAK(state->port.tty);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* UART_ENABLE_MS - determine if port should enable modem status irqs
|
|
*/
|
|
#define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
|
|
(cflag) & CRTSCTS || \
|
|
!((cflag) & CLOCAL))
|
|
|
|
int uart_get_rs485_mode(struct uart_port *port);
|
|
#endif /* LINUX_SERIAL_CORE_H */
|