Release 4.7 include/linux/serial_core.h

/*
 *  linux/drivers/char/serial_core.h
 *
 *  Copyright (C) 2000 Deep Blue Solutions Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef LINUX_SERIAL_CORE_H

#define LINUX_SERIAL_CORE_H


#include <linux/compiler.h>
#include <linux/interrupt.h>
#include <linux/circ_buf.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/mutex.h>
#include <linux/sysrq.h>
#include <uapi/linux/serial_core.h>

#ifdef CONFIG_SERIAL_CORE_CONSOLE

#define uart_console(port) \
	((port)->cons && (port)->cons->index == (port)->line)
#else

#define uart_console(port)      ({ (void)port; 0; })
#endif

struct uart_port;
struct serial_struct;
struct device;

/*
 * This structure describes all the operations that can be done on the
 * physical hardware.  See Documentation/serial/driver for details.
 */

struct uart_ops {
	
unsigned int	(*tx_empty)(struct uart_port *);
	
void		(*set_mctrl)(struct uart_port *, unsigned int mctrl);
	
unsigned int	(*get_mctrl)(struct uart_port *);
	
void		(*stop_tx)(struct uart_port *);
	
void		(*start_tx)(struct uart_port *);
	
void		(*throttle)(struct uart_port *);
	
void		(*unthrottle)(struct uart_port *);
	
void		(*send_xchar)(struct uart_port *, char ch);
	
void		(*stop_rx)(struct uart_port *);
	
void		(*enable_ms)(struct uart_port *);
	
void		(*break_ctl)(struct uart_port *, int ctl);
	
int		(*startup)(struct uart_port *);
	
void		(*shutdown)(struct uart_port *);
	
void		(*flush_buffer)(struct uart_port *);
	
void		(*set_termios)(struct uart_port *, struct ktermios *new,
				       struct ktermios *old);
	
void		(*set_ldisc)(struct uart_port *, struct ktermios *);
	
void		(*pm)(struct uart_port *, unsigned int state,
			      unsigned int oldstate);

	/*
         * Return a string describing the type of the port
         */
	
const char	*(*type)(struct uart_port *);

	/*
         * Release IO and memory resources used by the port.
         * This includes iounmap if necessary.
         */
	
void		(*release_port)(struct uart_port *);

	/*
         * Request IO and memory resources used by the port.
         * This includes iomapping the port if necessary.
         */
	
int		(*request_port)(struct uart_port *);
	
void		(*config_port)(struct uart_port *, int);
	
int		(*verify_port)(struct uart_port *, struct serial_struct *);
	
int		(*ioctl)(struct uart_port *, unsigned int, unsigned long);
#ifdef CONFIG_CONSOLE_POLL
	
int		(*poll_init)(struct uart_port *);
	
void		(*poll_put_char)(struct uart_port *, unsigned char);
	
int		(*poll_get_char)(struct uart_port *);
#endif
};


#define NO_POLL_CHAR		0x00ff0000

#define UART_CONFIG_TYPE	(1 << 0)

#define UART_CONFIG_IRQ		(1 << 1)


struct uart_icount {
	
__u32	cts;
	
__u32	dsr;
	
__u32	rng;
	
__u32	dcd;
	
__u32	rx;
	
__u32	tx;
	
__u32	frame;
	
__u32	overrun;
	
__u32	parity;
	
__u32	brk;
	
__u32	buf_overrun;
};


typedef unsigned int __bitwise__ upf_t;

typedef unsigned int __bitwise__ upstat_t;


struct uart_port {
	
spinlock_t		lock;			/* port lock */
	
unsigned long		iobase;			/* in/out[bwl] */
	
unsigned char __iomem	*membase;		/* read/write[bwl] */
	
unsigned int		(*serial_in)(struct uart_port *, int);
	
void			(*serial_out)(struct uart_port *, int, int);
	
void			(*set_termios)(struct uart_port *,
				               struct ktermios *new,
				               struct ktermios *old);
	
unsigned int		(*get_mctrl)(struct uart_port *);
	
void			(*set_mctrl)(struct uart_port *, unsigned int);
	
int			(*startup)(struct uart_port *port);
	
void			(*shutdown)(struct uart_port *port);
	
void			(*throttle)(struct uart_port *port);
	
void			(*unthrottle)(struct uart_port *port);
	
int			(*handle_irq)(struct uart_port *);
	
void			(*pm)(struct uart_port *, unsigned int state,
				      unsigned int old);
	
void			(*handle_break)(struct uart_port *);
	
int			(*rs485_config)(struct uart_port *,
						struct serial_rs485 *rs485);
	
unsigned int		irq;			/* irq number */
	
unsigned long		irqflags;		/* irq flags  */
	
unsigned int		uartclk;		/* base uart clock */
	
unsigned int		fifosize;		/* tx fifo size */
	
unsigned char		x_char;			/* xon/xoff char */
	
unsigned char		regshift;		/* reg offset shift */
	
unsigned char		iotype;			/* io access style */
	
unsigned char		unused1;


#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 */

	
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 */
#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
	
unsigned long		sysrq;			/* sysrq timeout */
#endif

	/* 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..UPF_LAST_USER] are userspace defined/visible/changeable
         * except bit 15 (UPF_NO_TXEN_TEST) which is masked off.
         * 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_NO_TXEN_TEST	((__force upf_t) (1 << 15))

#define UPF_MAGIC_MULTIPLIER	((__force upf_t) ASYNC_MAGIC_MULTIPLIER /* 16 */ )

/* Port has hardware-assisted h/w flow control */

#define UPF_AUTO_CTS		((__force upf_t) (1 << 20))

#define UPF_AUTO_RTS		((__force upf_t) (1 << 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) (1 << 22))

#define UPF_CONS_FLOW		((__force upf_t) (1 << 23))

#define UPF_SHARE_IRQ		((__force upf_t) (1 << 24))

#define UPF_EXAR_EFR		((__force upf_t) (1 << 25))

#define UPF_BUG_THRE		((__force upf_t) (1 << 26))
/* The exact UART type is known and should not be probed.  */

#define UPF_FIXED_TYPE		((__force upf_t) (1 << 27))

#define UPF_BOOT_AUTOCONF	((__force upf_t) (1 << 28))

#define UPF_FIXED_PORT		((__force upf_t) (1 << 29))

#define UPF_DEAD		((__force upf_t) (1 << 30))

#define UPF_IOREMAP		((__force upf_t) (1 << 31))


#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))

	
int			hw_stopped;		/* sw-assisted CTS flow state */
	
unsigned int		mctrl;			/* current modem ctrl settings */
	
unsigned int		timeout;		/* character-based timeout */
	
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;			/* parent device */
	
unsigned char		hub6;			/* this should be in the 8250 driver */
	
unsigned char		suspended;
	
unsigned char		irq_wake;
	
unsigned char		unused[2];
	
struct attribute_group	*attr_group;		/* port specific attributes */
	
const struct attribute_group **tty_groups;	/* all attributes (serial core use only) */
	
struct serial_rs485     rs485;
	
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);
}

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static inline void serial_port_out(struct uart_port *up, int offset, int value)
{
	up->serial_out(up, offset, value);
}

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/**
 * 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

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);
unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
				struct ktermios *old, unsigned int min,
				unsigned int max);
unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);

/* 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;
}

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/*
 * Console helpers.
 */

struct earlycon_device {
	
struct console *con;
	
struct uart_port port;
	
char options[16];		/* e.g., 115200n8 */
	
unsigned int baud;
};


struct earlycon_id {
	
char	name[16];
	
char	compatible[128];
	
int	(*setup)(struct earlycon_device *, const char *options);
} __aligned(32);

extern const struct earlycon_id __earlycon_table[];
extern const struct earlycon_id __earlycon_table_end[];


#define OF_EARLYCON_DECLARE(_name, compat, fn)				\
	static const struct earlycon_id __UNIQUE_ID(__earlycon_##_name) \
             __used __section(__earlycon_table)                         \
                = { .name = __stringify(_name),                         \
                    .compatible = compat,                               \
                    .setup = fn  }


#define EARLYCON_DECLARE(_name, fn)	OF_EARLYCON_DECLARE(_name, "", fn)

extern int setup_earlycon(char *buf);
extern int of_setup_earlycon(const struct earlycon_id *match,
			     unsigned long node,
			     const char *options);

struct uart_port *uart_get_console(struct uart_port *ports, int nr,
				   struct console *c);
int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
			char **options);
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);
void uart_console_write(struct uart_port *port, const char *s,
			unsigned int count,
			void (*putchar)(struct uart_port *, int));

/*
 * 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))



static inline int uart_tx_stopped(struct uart_port *port)
{
	struct tty_struct *tty = port->state->port.tty;
	if (tty->stopped || port->hw_stopped)
		return 1;
	return 0;
}

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static inline bool uart_cts_enabled(struct uart_port *uport)
{
	return !!(uport->status & UPSTAT_CTS_ENABLE);
}

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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);
}

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/*
 * The following are helper functions for the low level drivers.
 */

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

static inline int

uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
{
	if (port->sysrq) {
		if (ch && time_before(jiffies, port->sysrq)) {
			handle_sysrq(ch);
			port->sysrq = 0;
			return 1;
		}
		port->sysrq = 0;
	}
	return 0;
}
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#else

#define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
#endif

/*
 * 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 SUPPORT_SYSRQ
	if (port->cons && port->cons->index == port->line) {
		if (!port->sysrq) {
			port->sysrq = jiffies + HZ*5;
			return 1;
		}
		port->sysrq = 0;
	}
#endif
	if (port->flags & UPF_SAK)
		do_SAK(state->port.tty);
	return 0;
}

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/*
 *      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 */
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maciej w. rozycki
maciej w. rozycki
3
0.14%
1
0.93%
pantelis antoniou
pantelis antoniou
3
0.14%
1
0.93%
alexander gordeev
alexander gordeev
2
0.10%
1
0.93%
david howells
david howells
1
0.05%
1
0.93%
john crispin
john crispin
1
0.05%
1
0.93%
josh boyer
josh boyer
1
0.05%
1
0.93%
david s. miller
david s. miller
1
0.05%
1
0.93%
Total
2088
100.00%
108
100.00%
  
Directory: include/linux

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