/*
 *  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/serial.h>

#define PORT_UNKNOWN	0
#define PORT_8250	1
#define PORT_16450	2
#define PORT_16550	3
#define PORT_16550A	4
#define PORT_CIRRUS	5
#define PORT_16650	6
#define PORT_16650V2	7
#define PORT_16750	8
#define PORT_STARTECH	9
#define PORT_16C950	10
#define PORT_16654	11
#define PORT_16850	12
#define PORT_RSA	13
#define PORT_NS16550A	14
#define PORT_XSCALE	15
#define PORT_RM9000	16	/* PMC-Sierra RM9xxx internal UART */
#define PORT_OCTEON	17	/* Cavium OCTEON internal UART */
#define PORT_AR7	18	/* Texas Instruments AR7 internal UART */
#define PORT_U6_16550A	19	/* ST-Ericsson U6xxx internal UART */
#define PORT_TEGRA	20	/* NVIDIA Tegra internal UART */
#define PORT_XR17D15X	21	/* Exar XR17D15x UART */
#define PORT_BRCM_TRUMANAGE	25
#define PORT_ALTR_16550_F32 26 /* Altera 16550 UART with 32 FIFOs */
#define PORT_ALTR_16550_F64 27 /* Altera 16550 UART with 64 FIFOs */
#define PORT_ALTR_16550_F128 28 /* Altera 16550 UART with 128 FIFOs */
#define PORT_MAX_8250	28	/* max port ID */

#define PORT_PXA	31
#define PORT_AMBA	32
#define PORT_CLPS711X	33
#define PORT_SA1100	34
#define PORT_UART00	35
#define PORT_21285	37

#define PORT_SUNZILOG	38
#define PORT_SUNSAB	39

#define PORT_DZ		46
#define PORT_ZS		47

#define PORT_MUX	48

#define PORT_ATMEL	49

#define PORT_MAC_ZILOG	50	
#define PORT_PMAC_ZILOG	51

#define PORT_SCI	52
#define PORT_SCIF	53
#define PORT_IRDA	54

#define PORT_S3C2410    55

#define PORT_IP22ZILOG	56

#define PORT_LH7A40X	57

#define PORT_CPM        58

#define PORT_MPC52xx	59

#define PORT_ICOM	60

#define PORT_S3C2440	61

#define PORT_IMX	62

#define PORT_MPSC	63

#define PORT_TXX9	64

#define PORT_VR41XX_SIU		65
#define PORT_VR41XX_DSIU	66

#define PORT_S3C2400	67

#define PORT_M32R_SIO	68

#define PORT_JSM        69

#define PORT_PNX8XXX	70

#define PORT_NETX	71

#define PORT_SUNHV	72

#define PORT_S3C2412	73

#define PORT_UARTLITE	74

#define PORT_BFIN	75

#define PORT_KS8695	76

#define PORT_SB1250_DUART	77

#define PORT_MCF	78

#define PORT_BFIN_SPORT		79

#define PORT_MN10300		80
#define PORT_MN10300_CTS	81

#define PORT_SC26XX	82

#define PORT_SCIFA	83

#define PORT_S3C6400	84

#define PORT_NWPSERIAL	85

#define PORT_MAX3100    86

#define PORT_TIMBUART	87

#define PORT_MSM	88

#define PORT_BCM63XX	89

#define PORT_APBUART    90

#define PORT_ALTERA_JTAGUART	91
#define PORT_ALTERA_UART	92

#define PORT_SCIFB	93

#define PORT_MAX3107	94

#define PORT_MFD	95

#define PORT_OMAP	96

#define PORT_VT8500	97

#define PORT_XUARTPS	98

#define PORT_AR933X	99

#define PORT_EFMUART   100

#ifdef __KERNEL__

#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 <linux/pps_kernel.h>

struct uart_port;
struct serial_struct;
struct device;

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		(*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 *, int new);
	void		(*pm)(struct uart_port *, unsigned int state,
			      unsigned int oldstate);
	int		(*set_wake)(struct uart_port *, unsigned int state);
	void		(*wake_peer)(struct uart_port *);

	const char *(*type)(struct uart_port *);

	void		(*release_port)(struct uart_port *);

	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
	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;

struct uart_port {
	spinlock_t		lock;			
	unsigned long		iobase;			
	unsigned char __iomem	*membase;		
	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);
	int			(*handle_irq)(struct uart_port *);
	void			(*pm)(struct uart_port *, unsigned int state,
				      unsigned int old);
	unsigned int		irq;			
	unsigned long		irqflags;		
	unsigned int		uartclk;		
	unsigned int		fifosize;		
	unsigned char		x_char;			
	unsigned char		regshift;		
	unsigned char		iotype;			
	unsigned char		unused1;

#define UPIO_PORT		(0)
#define UPIO_HUB6		(1)
#define UPIO_MEM		(2)
#define UPIO_MEM32		(3)
#define UPIO_AU			(4)			
#define UPIO_TSI		(5)			
#define UPIO_RM9000		(6)			

	unsigned int		read_status_mask;	
	unsigned int		ignore_status_mask;	
	struct uart_state	*state;			
	struct uart_icount	icount;			

	struct console		*cons;			
#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
	unsigned long		sysrq;			
#endif

	upf_t			flags;

#define UPF_FOURPORT		((__force upf_t) (1 << 1))
#define UPF_SAK			((__force upf_t) (1 << 2))
#define UPF_SPD_MASK		((__force upf_t) (0x1030))
#define UPF_SPD_HI		((__force upf_t) (0x0010))
#define UPF_SPD_VHI		((__force upf_t) (0x0020))
#define UPF_SPD_CUST		((__force upf_t) (0x0030))
#define UPF_SPD_SHI		((__force upf_t) (0x1000))
#define UPF_SPD_WARP		((__force upf_t) (0x1010))
#define UPF_SKIP_TEST		((__force upf_t) (1 << 6))
#define UPF_AUTO_IRQ		((__force upf_t) (1 << 7))
#define UPF_HARDPPS_CD		((__force upf_t) (1 << 11))
#define UPF_LOW_LATENCY		((__force upf_t) (1 << 13))
#define UPF_BUGGY_UART		((__force upf_t) (1 << 14))
#define UPF_NO_TXEN_TEST	((__force upf_t) (1 << 15))
#define UPF_MAGIC_MULTIPLIER	((__force upf_t) (1 << 16))
#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))
#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		((__force upf_t) (0x17fff))
#define UPF_USR_MASK		((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))

	unsigned int		mctrl;			
	unsigned int		timeout;		
	unsigned int		type;			
	const struct uart_ops	*ops;
	unsigned int		custom_divisor;
	unsigned int		line;			
	resource_size_t		mapbase;		
	struct device		*dev;			
	unsigned char		hub6;			
	unsigned char		suspended;
	unsigned char		irq_wake;
	unsigned char		unused[2];
	void			*private_data;		
};

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);
}

struct uart_state {
	struct tty_port		port;

	int			pm_state;
	struct circ_buf		xmit;

	struct uart_port	*uart_port;
};

#define UART_XMIT_SIZE	PAGE_SIZE


#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;

	struct uart_state	*state;
	struct tty_driver	*tty_driver;
};

void uart_write_wakeup(struct uart_port *port);

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);

static inline int uart_poll_timeout(struct uart_port *port)
{
	int timeout = port->timeout;

	return timeout > 6 ? (timeout / 2 - 2) : 1;
}

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);
void uart_console_write(struct uart_port *port, const char *s,
			unsigned int count,
			void (*putchar)(struct uart_port *, int));

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);

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 || tty->hw_stopped)
		return 1;
	return 0;
}


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

static inline int uart_handle_break(struct uart_port *port)
{
	struct uart_state *state = port->state;
#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;
}

#define UART_ENABLE_MS(port,cflag)	((port)->flags & UPF_HARDPPS_CD || \
					 (cflag) & CRTSCTS || \
					 !((cflag) & CLOCAL))

#endif

#endif