summaryrefslogtreecommitdiff
path: root/include/linux/serial_8250.h
blob: 2b70f736b091dde3bf1898d96a16e8ca6d90f752 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *  linux/include/linux/serial_8250.h
 *
 *  Copyright (C) 2004 Russell King
 */
#ifndef _LINUX_SERIAL_8250_H
#define _LINUX_SERIAL_8250_H

#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/platform_device.h>

/*
 * This is the platform device platform_data structure
 */
struct plat_serial8250_port {
	unsigned long	iobase;		/* io base address */
	void __iomem	*membase;	/* ioremap cookie or NULL */
	resource_size_t	mapbase;	/* resource base */
	unsigned int	irq;		/* interrupt number */
	unsigned long	irqflags;	/* request_irq flags */
	unsigned int	uartclk;	/* UART clock rate */
	void            *private_data;
	unsigned char	regshift;	/* register shift */
	unsigned char	iotype;		/* UPIO_* */
	unsigned char	hub6;
	unsigned char	has_sysrq;	/* supports magic SysRq */
	upf_t		flags;		/* UPF_* flags */
	unsigned int	type;		/* If UPF_FIXED_TYPE */
	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);
	void		(*set_ldisc)(struct uart_port *,
				     struct ktermios *);
	unsigned int	(*get_mctrl)(struct uart_port *);
	int		(*handle_irq)(struct uart_port *);
	void		(*pm)(struct uart_port *, unsigned int state,
			      unsigned old);
	void		(*handle_break)(struct uart_port *);
};

/*
 * Allocate 8250 platform device IDs.  Nothing is implied by
 * the numbering here, except for the legacy entry being -1.
 */
enum {
	PLAT8250_DEV_LEGACY = -1,
	PLAT8250_DEV_PLATFORM,
	PLAT8250_DEV_PLATFORM1,
	PLAT8250_DEV_PLATFORM2,
	PLAT8250_DEV_FOURPORT,
	PLAT8250_DEV_ACCENT,
	PLAT8250_DEV_BOCA,
	PLAT8250_DEV_EXAR_ST16C554,
	PLAT8250_DEV_HUB6,
	PLAT8250_DEV_AU1X00,
	PLAT8250_DEV_SM501,
};

struct uart_8250_dma;
struct uart_8250_port;

/**
 * 8250 core driver operations
 *
 * @setup_irq()		Setup irq handling. The universal 8250 driver links this
 *			port to the irq chain. Other drivers may @request_irq().
 * @release_irq()	Undo irq handling. The universal 8250 driver unlinks
 *			the port from the irq chain.
 */
struct uart_8250_ops {
	int		(*setup_irq)(struct uart_8250_port *);
	void		(*release_irq)(struct uart_8250_port *);
};

struct uart_8250_em485 {
	struct hrtimer		start_tx_timer; /* "rs485 start tx" timer */
	struct hrtimer		stop_tx_timer;  /* "rs485 stop tx" timer */
	struct hrtimer		*active_timer;  /* pointer to active timer */
	struct uart_8250_port	*port;          /* for hrtimer callbacks */
	unsigned int		tx_stopped:1;	/* tx is currently stopped */
};

/*
 * This should be used by drivers which want to register
 * their own 8250 ports without registering their own
 * platform device.  Using these will make your driver
 * dependent on the 8250 driver.
 */

struct uart_8250_port {
	struct uart_port	port;
	struct timer_list	timer;		/* "no irq" timer */
	struct list_head	list;		/* ports on this IRQ */
	u32			capabilities;	/* port capabilities */
	unsigned short		bugs;		/* port bugs */
	bool			fifo_bug;	/* min RX trigger if enabled */
	unsigned int		tx_loadsz;	/* transmit fifo load size */
	unsigned char		acr;
	unsigned char		fcr;
	unsigned char		ier;
	unsigned char		lcr;
	unsigned char		mcr;
	unsigned char		mcr_mask;	/* mask of user bits */
	unsigned char		mcr_force;	/* mask of forced bits */
	unsigned char		cur_iotype;	/* Running I/O type */
	unsigned int		rpm_tx_active;
	unsigned char		canary;		/* non-zero during system sleep
						 *   if no_console_suspend
						 */
	unsigned char		probe;
	struct mctrl_gpios	*gpios;
#define UART_PROBE_RSA	(1 << 0)

	/*
	 * Some bits in registers are cleared on a read, so they must
	 * be saved whenever the register is read but the bits will not
	 * be immediately processed.
	 */
#define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
	unsigned char		lsr_saved_flags;
#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
	unsigned char		msr_saved_flags;

	struct uart_8250_dma	*dma;
	const struct uart_8250_ops *ops;

	/* 8250 specific callbacks */
	int			(*dl_read)(struct uart_8250_port *);
	void			(*dl_write)(struct uart_8250_port *, int);

	struct uart_8250_em485 *em485;
	void			(*rs485_start_tx)(struct uart_8250_port *);
	void			(*rs485_stop_tx)(struct uart_8250_port *);

	/* Serial port overrun backoff */
	struct delayed_work overrun_backoff;
	u32 overrun_backoff_time_ms;
};

static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up)
{
	return container_of(up, struct uart_8250_port, port);
}

int serial8250_register_8250_port(struct uart_8250_port *);
void serial8250_unregister_port(int line);
void serial8250_suspend_port(int line);
void serial8250_resume_port(int line);

extern int early_serial_setup(struct uart_port *port);

extern int early_serial8250_setup(struct earlycon_device *device,
					 const char *options);
extern void serial8250_update_uartclk(struct uart_port *port,
				      unsigned int uartclk);
extern void serial8250_do_set_termios(struct uart_port *port,
		struct ktermios *termios, struct ktermios *old);
extern void serial8250_do_set_ldisc(struct uart_port *port,
				    struct ktermios *termios);
extern unsigned int serial8250_do_get_mctrl(struct uart_port *port);
extern int serial8250_do_startup(struct uart_port *port);
extern void serial8250_do_shutdown(struct uart_port *port);
extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
			     unsigned int oldstate);
extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
extern void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
				      unsigned int quot,
				      unsigned int quot_frac);
extern int fsl8250_handle_irq(struct uart_port *port);
int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr);
void serial8250_tx_chars(struct uart_8250_port *up);
unsigned int serial8250_modem_status(struct uart_8250_port *up);
void serial8250_init_port(struct uart_8250_port *up);
void serial8250_set_defaults(struct uart_8250_port *up);
void serial8250_console_write(struct uart_8250_port *up, const char *s,
			      unsigned int count);
int serial8250_console_setup(struct uart_port *port, char *options, bool probe);
int serial8250_console_exit(struct uart_port *port);

extern void serial8250_set_isa_configurator(void (*v)
					(int port, struct uart_port *up,
						u32 *capabilities));

#endif