2005-04-17 06:20:36 +08:00
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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2005-07-16 16:30:53 +08:00
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#include <linux/compiler.h>
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2005-04-17 06:20:36 +08:00
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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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2006-01-14 05:37:07 +08:00
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#include <linux/mutex.h>
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2007-06-01 15:47:07 +08:00
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#include <linux/sysrq.h>
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2012-10-13 17:46:48 +08:00
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#include <uapi/linux/serial_core.h>
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2005-04-17 06:20:36 +08:00
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2013-05-15 23:35:37 +08:00
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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) (0)
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#endif
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2005-04-17 06:20:36 +08:00
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struct uart_port;
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struct serial_struct;
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struct device;
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/*
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2012-12-27 12:43:42 +08:00
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* This structure describes all the operations that can be done on the
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* physical hardware. See Documentation/serial/driver for details.
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2005-04-17 06:20:36 +08:00
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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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2005-08-31 17:12:14 +08:00
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void (*stop_tx)(struct uart_port *);
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void (*start_tx)(struct uart_port *);
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2012-04-18 00:23:14 +08:00
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void (*throttle)(struct uart_port *);
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void (*unthrottle)(struct uart_port *);
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2005-04-17 06:20:36 +08:00
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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 (*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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2008-07-17 04:52:36 +08:00
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void (*flush_buffer)(struct uart_port *);
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2006-12-08 18:38:45 +08:00
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void (*set_termios)(struct uart_port *, struct ktermios *new,
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struct ktermios *old);
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2010-06-02 04:52:53 +08:00
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void (*set_ldisc)(struct uart_port *, int new);
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2005-04-17 06:20:36 +08:00
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void (*pm)(struct uart_port *, unsigned int state,
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unsigned int oldstate);
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/*
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* Return a string describing the type of the port
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*/
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2012-12-27 12:43:42 +08:00
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const char *(*type)(struct uart_port *);
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2005-04-17 06:20:36 +08:00
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/*
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* Release IO and memory resources used by the port.
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* This includes iounmap if necessary.
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*/
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void (*release_port)(struct uart_port *);
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/*
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* Request IO and memory resources used by the port.
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* This includes iomapping the port if necessary.
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*/
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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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2008-04-18 02:05:37 +08:00
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#ifdef CONFIG_CONSOLE_POLL
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2012-09-25 05:27:53 +08:00
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int (*poll_init)(struct uart_port *);
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2012-12-27 12:43:42 +08:00
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void (*poll_put_char)(struct uart_port *, unsigned char);
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2008-04-18 02:05:37 +08:00
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int (*poll_get_char)(struct uart_port *);
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#endif
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2005-04-17 06:20:36 +08:00
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};
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2010-05-21 10:04:22 +08:00
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#define NO_POLL_CHAR 0x00ff0000
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2005-04-17 06:20:36 +08:00
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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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2006-01-22 07:03:28 +08:00
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typedef unsigned int __bitwise__ upf_t;
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2005-04-17 06:20:36 +08:00
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struct uart_port {
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spinlock_t lock; /* port lock */
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2008-10-13 17:35:23 +08:00
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unsigned long iobase; /* in/out[bwl] */
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2005-04-17 06:20:36 +08:00
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unsigned char __iomem *membase; /* read/write[bwl] */
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2009-01-02 21:49:47 +08:00
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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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U6715 16550A serial driver support
UART Features extract from STEricsson U6715 data-sheet (arm926 SoC for mobile phone):
* Fully compatible with industry standard 16C550 and 16C450 from various
manufacturers
* RX and TX 64 byte FIFO reduces CPU interrupts
* Full double buffering
* Modem control signals include CTS, RTS, (and DSR, DTR on UART1 only)
* Automatic baud rate selection
* Manual or automatic RTS/CTS smart hardware flow control
* Programmable serial characteristics:
– Baud rate generation (50 to 3.25M baud)
– 5, 6, 7 or 8-bit characters
– Even, odd or no-parity bit generation and detection
– 1, 1.5 or 2 stop bit generation
* Independent control of transmit, receive, line status, data set interrupts and FIFOs
* Full status-reporting capabilities
* Separate DMA signaling for RX and TX
* Timed interrupt to spread receive interrupt on known duration
* DMA time-out interrupt to allow detection of end of reception
* Carkit pulse coding and decoding compliant with USB carkit control interface [40]
In 16550A auto-configuration, if the fifo size is 64 then it's an U6 16550A port
Add set_termios hook & export serial8250_do_set_termios to change uart
clock following baudrate
Signed-off-by: Philippe Langlais <philippe.langlais@stericsson.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-07-29 23:13:57 +08:00
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void (*set_termios)(struct uart_port *,
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struct ktermios *new,
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struct ktermios *old);
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2011-08-15 17:17:51 +08:00
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int (*handle_irq)(struct uart_port *);
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2010-09-25 21:13:45 +08:00
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void (*pm)(struct uart_port *, unsigned int state,
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unsigned int old);
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2012-04-11 05:10:53 +08:00
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void (*handle_break)(struct uart_port *);
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2005-04-17 06:20:36 +08:00
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unsigned int irq; /* irq number */
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2009-09-20 04:13:19 +08:00
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unsigned long irqflags; /* irq flags */
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2005-04-17 06:20:36 +08:00
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unsigned int uartclk; /* base uart clock */
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2006-07-03 03:45:51 +08:00
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unsigned int fifosize; /* tx fifo size */
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2005-04-17 06:20:36 +08:00
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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 */
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2006-07-03 03:45:51 +08:00
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unsigned char unused1;
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2005-04-17 06:20:36 +08:00
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#define UPIO_PORT (0)
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#define UPIO_HUB6 (1)
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#define UPIO_MEM (2)
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#define UPIO_MEM32 (3)
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2013-01-26 02:39:51 +08:00
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#define UPIO_AU (4) /* Au1x00 and RT288x type IO */
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2006-06-30 17:29:58 +08:00
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#define UPIO_TSI (5) /* Tsi108/109 type IO */
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2005-04-17 06:20:36 +08:00
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unsigned int read_status_mask; /* driver specific */
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unsigned int ignore_status_mask; /* driver specific */
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2009-09-20 04:13:28 +08:00
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struct uart_state *state; /* pointer to parent state */
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2005-04-17 06:20:36 +08:00
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struct uart_icount icount; /* statistics */
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struct console *cons; /* struct console, if any */
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2009-04-07 00:34:34 +08:00
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#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
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2005-04-17 06:20:36 +08:00
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unsigned long sysrq; /* sysrq timeout */
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#endif
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2006-01-22 07:03:28 +08:00
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upf_t flags;
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#define UPF_FOURPORT ((__force upf_t) (1 << 1))
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#define UPF_SAK ((__force upf_t) (1 << 2))
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#define UPF_SPD_MASK ((__force upf_t) (0x1030))
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#define UPF_SPD_HI ((__force upf_t) (0x0010))
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#define UPF_SPD_VHI ((__force upf_t) (0x0020))
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#define UPF_SPD_CUST ((__force upf_t) (0x0030))
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#define UPF_SPD_SHI ((__force upf_t) (0x1000))
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#define UPF_SPD_WARP ((__force upf_t) (0x1010))
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#define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
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#define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
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#define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
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#define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
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#define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
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8250: fix boot hang with serial console when using with Serial Over Lan port
Intel 8257x Ethernet boards have a feature called Serial Over Lan.
This feature works by emulating a serial port, and it is detected by
kernel as a normal 8250 port. However, this emulation is not perfect, as
also noticed on changeset 7500b1f602aad75901774a67a687ee985d85893f.
Before this patch, the kernel were trying to check if the serial TX is
capable of work using IRQ's.
This were done with a code similar this:
serial_outp(up, UART_IER, UART_IER_THRI);
lsr = serial_in(up, UART_LSR);
iir = serial_in(up, UART_IIR);
serial_outp(up, UART_IER, 0);
if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT)
up->bugs |= UART_BUG_TXEN;
This works fine for other 8250 ports, but, on 8250-emulated SoL port, the
chip is a little lazy to down UART_IIR_NO_INT at UART_IIR register.
Due to that, UART_BUG_TXEN is sometimes enabled. However, as TX IRQ keeps
working, and the TX polling is now enabled, the driver miss-interprets the
IRQ received later, hanging up the machine until a key is pressed at the
serial console.
This is the 6 version of this patch. Previous versions were trying to
introduce a large enough delay between serial_outp and serial_in(up,
UART_IIR), but not taking forever. However, the needed delay couldn't be
safely determined.
At the experimental tests, a delay of 1us solves most of the cases, but
still hangs sometimes. Increasing the delay to 5us was better, but still
doesn't solve. A very high delay of 50 ms seemed to work every time.
However, poking around with delays and pray for it to be enough doesn't
seem to be a good approach, even for a quirk.
So, instead of playing with random large arbitrary delays, let's just
disable UART_BUG_TXEN for all SoL ports.
[akpm@linux-foundation.org: fix warnings]
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-02-21 07:38:52 +08:00
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#define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15))
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2006-01-22 07:03:28 +08:00
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#define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
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2012-04-17 23:41:10 +08:00
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/* Port has hardware-assisted h/w flow control (iow, auto-RTS *not* auto-CTS) */
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#define UPF_HARD_FLOW ((__force upf_t) (1 << 21))
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2012-04-17 23:34:13 +08:00
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/* Port has hardware-assisted s/w flow control */
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#define UPF_SOFT_FLOW ((__force upf_t) (1 << 22))
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2006-01-22 07:03:28 +08:00
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#define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
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#define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
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2011-09-03 04:55:37 +08:00
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#define UPF_EXAR_EFR ((__force upf_t) (1 << 25))
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2012-04-07 02:49:50 +08:00
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#define UPF_BUG_THRE ((__force upf_t) (1 << 26))
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2009-01-02 21:49:54 +08:00
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/* The exact UART type is known and should not be probed. */
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#define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
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2006-01-22 07:03:28 +08:00
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#define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
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serial: define FIXED_PORT flag for serial_core
At present, the serial core always allows setserial in userspace to change the
port address, irq and base clock of any serial port. That makes sense for
legacy ISA ports, but not for (say) embedded ns16550 compatible serial ports
at peculiar addresses. In these cases, the kernel code configuring the ports
must know exactly where they are, and their clocking arrangements (which can
be unusual on embedded boards). It doesn't make sense for userspace to change
these settings.
Therefore, this patch defines a UPF_FIXED_PORT flag for the uart_port
structure. If this flag is set when the serial port is configured, any
attempts to alter the port's type, io address, irq or base clock with
setserial are ignored.
In addition this patch uses the new flag for on-chip serial ports probed in
arch/powerpc/kernel/legacy_serial.c, and for other hard-wired serial ports
probed by drivers/serial/of_serial.c.
Signed-off-by: David Gibson <dwg@au1.ibm.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-07 05:48:49 +08:00
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#define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
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2006-04-30 18:13:50 +08:00
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#define UPF_DEAD ((__force upf_t) (1 << 30))
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2006-01-22 07:03:28 +08:00
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#define UPF_IOREMAP ((__force upf_t) (1 << 31))
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#define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
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#define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
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2005-04-17 06:20:36 +08:00
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unsigned int mctrl; /* current modem ctrl settings */
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unsigned int timeout; /* character-based timeout */
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unsigned int type; /* port type */
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2006-01-22 06:45:50 +08:00
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const struct uart_ops *ops;
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2005-04-17 06:20:36 +08:00
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unsigned int custom_divisor;
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unsigned int line; /* port index */
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2007-07-24 09:43:44 +08:00
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resource_size_t mapbase; /* for ioremap */
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2005-04-17 06:20:36 +08:00
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struct device *dev; /* parent device */
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unsigned char hub6; /* this should be in the 8250 driver */
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wake up from a serial port
Enable wakeup from serial ports, make it run-time configurable over sysfs,
e.g.,
echo enabled > /sys/devices/platform/serial8250.0/tty/ttyS0/power/wakeup
Requires
# CONFIG_SYSFS_DEPRECATED is not set
Following suggestions from Alan and Russell moved the may_wake_up checks
to serial_core.c. This time actually tested - it does even work. Could
someone, please, verify, that put_device after device_find_child is
correct?
Also would be nice to test with a Natsemi UART, that can wake up the system,
if such systems exist.
For this you just have to apply the patch below, issue the above "echo"
command to one of your Natsemi port, suspend and resume your system, and
verify that your Natsemi port still works. If you are actually capable of
waking up the system from that port, would be nice to test that as well.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 16:24:02 +08:00
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unsigned char suspended;
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2010-12-16 20:42:47 +08:00
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unsigned char irq_wake;
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wake up from a serial port
Enable wakeup from serial ports, make it run-time configurable over sysfs,
e.g.,
echo enabled > /sys/devices/platform/serial8250.0/tty/ttyS0/power/wakeup
Requires
# CONFIG_SYSFS_DEPRECATED is not set
Following suggestions from Alan and Russell moved the may_wake_up checks
to serial_core.c. This time actually tested - it does even work. Could
someone, please, verify, that put_device after device_find_child is
correct?
Also would be nice to test with a Natsemi UART, that can wake up the system,
if such systems exist.
For this you just have to apply the patch below, issue the above "echo"
command to one of your Natsemi port, suspend and resume your system, and
verify that your Natsemi port still works. If you are actually capable of
waking up the system from that port, would be nice to test that as well.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 16:24:02 +08:00
|
|
|
unsigned char unused[2];
|
2007-05-07 05:48:45 +08:00
|
|
|
void *private_data; /* generic platform data pointer */
|
2005-04-17 06:20:36 +08:00
|
|
|
};
|
|
|
|
|
2012-03-09 08:12:12 +08:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2012-12-07 18:36:08 +08:00
|
|
|
/**
|
|
|
|
* 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,
|
|
|
|
};
|
|
|
|
|
2009-09-20 04:13:28 +08:00
|
|
|
/*
|
|
|
|
* This is the state information which is persistent across opens.
|
|
|
|
*/
|
|
|
|
struct uart_state {
|
2008-07-17 04:53:50 +08:00
|
|
|
struct tty_port port;
|
2009-09-20 04:13:28 +08:00
|
|
|
|
2012-12-07 18:36:08 +08:00
|
|
|
enum uart_pm_state pm_state;
|
2005-04-17 06:20:36 +08:00
|
|
|
struct circ_buf xmit;
|
|
|
|
|
2009-09-20 04:13:28 +08:00
|
|
|
struct uart_port *uart_port;
|
2009-01-02 21:49:21 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
#define UART_XMIT_SIZE PAGE_SIZE
|
|
|
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/* number of characters left in xmit buffer before we ask for more */
|
|
|
|
#define WAKEUP_CHARS 256
|
|
|
|
|
|
|
|
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);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Baud rate helpers.
|
|
|
|
*/
|
|
|
|
void uart_update_timeout(struct uart_port *port, unsigned int cflag,
|
|
|
|
unsigned int baud);
|
2006-12-08 18:38:45 +08:00
|
|
|
unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
|
|
|
|
struct ktermios *old, unsigned int min,
|
2005-04-17 06:20:36 +08:00
|
|
|
unsigned int max);
|
|
|
|
unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
|
|
|
|
|
2010-10-01 21:21:25 +08:00
|
|
|
/* Base timer interval for polling */
|
|
|
|
static inline int uart_poll_timeout(struct uart_port *port)
|
|
|
|
{
|
|
|
|
int timeout = port->timeout;
|
|
|
|
|
|
|
|
return timeout > 6 ? (timeout / 2 - 2) : 1;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* Console helpers.
|
|
|
|
*/
|
2014-04-19 06:19:55 +08:00
|
|
|
struct earlycon_device {
|
|
|
|
struct console *con;
|
|
|
|
struct uart_port port;
|
|
|
|
char options[16]; /* e.g., 115200n8 */
|
|
|
|
unsigned int baud;
|
|
|
|
};
|
|
|
|
int setup_earlycon(char *buf, const char *match,
|
|
|
|
int (*setup)(struct earlycon_device *, const char *));
|
|
|
|
|
2014-03-27 21:06:16 +08:00
|
|
|
extern int of_setup_earlycon(unsigned long addr,
|
|
|
|
int (*setup)(struct earlycon_device *, const char *));
|
|
|
|
|
2014-04-19 06:19:55 +08:00
|
|
|
#define EARLYCON_DECLARE(name, func) \
|
|
|
|
static int __init name ## _setup_earlycon(char *buf) \
|
|
|
|
{ \
|
|
|
|
return setup_earlycon(buf, __stringify(name), func); \
|
|
|
|
} \
|
|
|
|
early_param("earlycon", name ## _setup_earlycon);
|
|
|
|
|
2014-03-27 21:06:16 +08:00
|
|
|
#define OF_EARLYCON_DECLARE(name, compat, fn) \
|
|
|
|
_OF_DECLARE(earlycon, name, compat, fn, void *)
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
struct uart_port *uart_get_console(struct uart_port *ports, int nr,
|
|
|
|
struct console *c);
|
|
|
|
void uart_parse_options(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);
|
2006-03-21 04:00:09 +08:00
|
|
|
void uart_console_write(struct uart_port *port, const char *s,
|
|
|
|
unsigned int count,
|
|
|
|
void (*putchar)(struct uart_port *, int));
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 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);
|
|
|
|
int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
|
|
|
|
int uart_match_port(struct uart_port *port1, 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))
|
|
|
|
|
2009-01-02 21:49:21 +08:00
|
|
|
static inline int uart_tx_stopped(struct uart_port *port)
|
|
|
|
{
|
2009-09-20 04:13:28 +08:00
|
|
|
struct tty_struct *tty = port->state->port.tty;
|
2009-01-02 21:49:21 +08:00
|
|
|
if(tty->stopped || tty->hw_stopped)
|
|
|
|
return 1;
|
|
|
|
return 0;
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* The following are helper functions for the low level drivers.
|
|
|
|
*/
|
2011-11-10 04:33:43 +08:00
|
|
|
|
|
|
|
extern void uart_handle_dcd_change(struct uart_port *uport,
|
|
|
|
unsigned int status);
|
|
|
|
extern void uart_handle_cts_change(struct uart_port *uport,
|
|
|
|
unsigned int status);
|
|
|
|
|
|
|
|
extern void uart_insert_char(struct uart_port *port, unsigned int status,
|
|
|
|
unsigned int overrun, unsigned int ch, unsigned int flag);
|
|
|
|
|
|
|
|
#ifdef SUPPORT_SYSRQ
|
2005-04-17 06:20:36 +08:00
|
|
|
static inline int
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 21:55:46 +08:00
|
|
|
uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
if (port->sysrq) {
|
|
|
|
if (ch && time_before(jiffies, port->sysrq)) {
|
2010-08-18 12:15:47 +08:00
|
|
|
handle_sysrq(ch);
|
2005-04-17 06:20:36 +08:00
|
|
|
port->sysrq = 0;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
port->sysrq = 0;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
2011-11-10 04:33:43 +08:00
|
|
|
#else
|
|
|
|
#define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
|
2005-09-09 05:47:12 +08:00
|
|
|
#endif
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* We do the SysRQ and SAK checking like this...
|
|
|
|
*/
|
|
|
|
static inline int uart_handle_break(struct uart_port *port)
|
|
|
|
{
|
2009-09-20 04:13:28 +08:00
|
|
|
struct uart_state *state = port->state;
|
2012-04-11 05:10:53 +08:00
|
|
|
|
|
|
|
if (port->handle_break)
|
|
|
|
port->handle_break(port);
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
#ifdef SUPPORT_SYSRQ
|
|
|
|
if (port->cons && port->cons->index == port->line) {
|
|
|
|
if (!port->sysrq) {
|
|
|
|
port->sysrq = jiffies + HZ*5;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
port->sysrq = 0;
|
|
|
|
}
|
|
|
|
#endif
|
2006-01-22 06:54:06 +08:00
|
|
|
if (port->flags & UPF_SAK)
|
2009-09-20 04:13:28 +08:00
|
|
|
do_SAK(state->port.tty);
|
2005-04-17 06:20:36 +08:00
|
|
|
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))
|
|
|
|
|
|
|
|
#endif /* LINUX_SERIAL_CORE_H */
|