2 * linux/drivers/char/serial_core.h
4 * Copyright (C) 2000 Deep Blue Solutions Ltd.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #ifndef LINUX_SERIAL_CORE_H
21 #define LINUX_SERIAL_CORE_H
24 #include <linux/compiler.h>
25 #include <linux/interrupt.h>
26 #include <linux/circ_buf.h>
27 #include <linux/spinlock.h>
28 #include <linux/sched.h>
29 #include <linux/tty.h>
30 #include <linux/mutex.h>
31 #include <linux/sysrq.h>
32 #include <uapi/linux/serial_core.h>
39 * This structure describes all the operations that can be done on the
40 * physical hardware. See Documentation/serial/driver for details.
43 unsigned int (*tx_empty
)(struct uart_port
*);
44 void (*set_mctrl
)(struct uart_port
*, unsigned int mctrl
);
45 unsigned int (*get_mctrl
)(struct uart_port
*);
46 void (*stop_tx
)(struct uart_port
*);
47 void (*start_tx
)(struct uart_port
*);
48 void (*throttle
)(struct uart_port
*);
49 void (*unthrottle
)(struct uart_port
*);
50 void (*send_xchar
)(struct uart_port
*, char ch
);
51 void (*stop_rx
)(struct uart_port
*);
52 void (*enable_ms
)(struct uart_port
*);
53 void (*break_ctl
)(struct uart_port
*, int ctl
);
54 int (*startup
)(struct uart_port
*);
55 void (*shutdown
)(struct uart_port
*);
56 void (*flush_buffer
)(struct uart_port
*);
57 void (*set_termios
)(struct uart_port
*, struct ktermios
*new,
58 struct ktermios
*old
);
59 void (*set_ldisc
)(struct uart_port
*, int new);
60 void (*pm
)(struct uart_port
*, unsigned int state
,
61 unsigned int oldstate
);
62 int (*set_wake
)(struct uart_port
*, unsigned int state
);
65 * Return a string describing the type of the port
67 const char *(*type
)(struct uart_port
*);
70 * Release IO and memory resources used by the port.
71 * This includes iounmap if necessary.
73 void (*release_port
)(struct uart_port
*);
76 * Request IO and memory resources used by the port.
77 * This includes iomapping the port if necessary.
79 int (*request_port
)(struct uart_port
*);
80 void (*config_port
)(struct uart_port
*, int);
81 int (*verify_port
)(struct uart_port
*, struct serial_struct
*);
82 int (*ioctl
)(struct uart_port
*, unsigned int, unsigned long);
83 #ifdef CONFIG_CONSOLE_POLL
84 int (*poll_init
)(struct uart_port
*);
85 void (*poll_put_char
)(struct uart_port
*, unsigned char);
86 int (*poll_get_char
)(struct uart_port
*);
90 #define NO_POLL_CHAR 0x00ff0000
91 #define UART_CONFIG_TYPE (1 << 0)
92 #define UART_CONFIG_IRQ (1 << 1)
108 typedef unsigned int __bitwise__ upf_t
;
111 spinlock_t lock
; /* port lock */
112 unsigned long iobase
; /* in/out[bwl] */
113 unsigned char __iomem
*membase
; /* read/write[bwl] */
114 unsigned int (*serial_in
)(struct uart_port
*, int);
115 void (*serial_out
)(struct uart_port
*, int, int);
116 void (*set_termios
)(struct uart_port
*,
117 struct ktermios
*new,
118 struct ktermios
*old
);
119 int (*handle_irq
)(struct uart_port
*);
120 void (*pm
)(struct uart_port
*, unsigned int state
,
122 void (*handle_break
)(struct uart_port
*);
123 unsigned int irq
; /* irq number */
124 unsigned long irqflags
; /* irq flags */
125 unsigned int uartclk
; /* base uart clock */
126 unsigned int fifosize
; /* tx fifo size */
127 unsigned char x_char
; /* xon/xoff char */
128 unsigned char regshift
; /* reg offset shift */
129 unsigned char iotype
; /* io access style */
130 unsigned char unused1
;
132 #define UPIO_PORT (0)
133 #define UPIO_HUB6 (1)
135 #define UPIO_MEM32 (3)
136 #define UPIO_AU (4) /* Au1x00 and RT288x type IO */
137 #define UPIO_TSI (5) /* Tsi108/109 type IO */
139 unsigned int read_status_mask
; /* driver specific */
140 unsigned int ignore_status_mask
; /* driver specific */
141 struct uart_state
*state
; /* pointer to parent state */
142 struct uart_icount icount
; /* statistics */
144 struct console
*cons
; /* struct console, if any */
145 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
146 unsigned long sysrq
; /* sysrq timeout */
151 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
152 #define UPF_SAK ((__force upf_t) (1 << 2))
153 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
154 #define UPF_SPD_HI ((__force upf_t) (0x0010))
155 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
156 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
157 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
158 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
159 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
160 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
161 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
162 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
163 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
164 #define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15))
165 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
166 /* Port has hardware-assisted h/w flow control (iow, auto-RTS *not* auto-CTS) */
167 #define UPF_HARD_FLOW ((__force upf_t) (1 << 21))
168 /* Port has hardware-assisted s/w flow control */
169 #define UPF_SOFT_FLOW ((__force upf_t) (1 << 22))
170 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
171 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
172 #define UPF_EXAR_EFR ((__force upf_t) (1 << 25))
173 #define UPF_BUG_THRE ((__force upf_t) (1 << 26))
174 /* The exact UART type is known and should not be probed. */
175 #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
176 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
177 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
178 #define UPF_DEAD ((__force upf_t) (1 << 30))
179 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
181 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
182 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
184 unsigned int mctrl
; /* current modem ctrl settings */
185 unsigned int timeout
; /* character-based timeout */
186 unsigned int type
; /* port type */
187 const struct uart_ops
*ops
;
188 unsigned int custom_divisor
;
189 unsigned int line
; /* port index */
190 resource_size_t mapbase
; /* for ioremap */
191 struct device
*dev
; /* parent device */
192 unsigned char hub6
; /* this should be in the 8250 driver */
193 unsigned char suspended
;
194 unsigned char irq_wake
;
195 unsigned char unused
[2];
196 void *private_data
; /* generic platform data pointer */
199 static inline int serial_port_in(struct uart_port
*up
, int offset
)
201 return up
->serial_in(up
, offset
);
204 static inline void serial_port_out(struct uart_port
*up
, int offset
, int value
)
206 up
->serial_out(up
, offset
, value
);
210 * enum uart_pm_state - power states for UARTs
211 * @UART_PM_STATE_ON: UART is powered, up and operational
212 * @UART_PM_STATE_OFF: UART is powered off
213 * @UART_PM_STATE_UNDEFINED: sentinel
216 UART_PM_STATE_ON
= 0,
217 UART_PM_STATE_OFF
= 3, /* number taken from ACPI */
218 UART_PM_STATE_UNDEFINED
,
222 * This is the state information which is persistent across opens.
225 struct tty_port port
;
227 enum uart_pm_state pm_state
;
228 struct circ_buf xmit
;
230 struct uart_port
*uart_port
;
233 #define UART_XMIT_SIZE PAGE_SIZE
236 /* number of characters left in xmit buffer before we ask for more */
237 #define WAKEUP_CHARS 256
243 struct module
*owner
;
244 const char *driver_name
;
245 const char *dev_name
;
249 struct console
*cons
;
252 * these are private; the low level driver should not
253 * touch these; they should be initialised to NULL
255 struct uart_state
*state
;
256 struct tty_driver
*tty_driver
;
259 void uart_write_wakeup(struct uart_port
*port
);
264 void uart_update_timeout(struct uart_port
*port
, unsigned int cflag
,
266 unsigned int uart_get_baud_rate(struct uart_port
*port
, struct ktermios
*termios
,
267 struct ktermios
*old
, unsigned int min
,
269 unsigned int uart_get_divisor(struct uart_port
*port
, unsigned int baud
);
271 /* Base timer interval for polling */
272 static inline int uart_poll_timeout(struct uart_port
*port
)
274 int timeout
= port
->timeout
;
276 return timeout
> 6 ? (timeout
/ 2 - 2) : 1;
282 struct uart_port
*uart_get_console(struct uart_port
*ports
, int nr
,
284 void uart_parse_options(char *options
, int *baud
, int *parity
, int *bits
,
286 int uart_set_options(struct uart_port
*port
, struct console
*co
, int baud
,
287 int parity
, int bits
, int flow
);
288 struct tty_driver
*uart_console_device(struct console
*co
, int *index
);
289 void uart_console_write(struct uart_port
*port
, const char *s
,
291 void (*putchar
)(struct uart_port
*, int));
294 * Port/driver registration/removal
296 int uart_register_driver(struct uart_driver
*uart
);
297 void uart_unregister_driver(struct uart_driver
*uart
);
298 int uart_add_one_port(struct uart_driver
*reg
, struct uart_port
*port
);
299 int uart_remove_one_port(struct uart_driver
*reg
, struct uart_port
*port
);
300 int uart_match_port(struct uart_port
*port1
, struct uart_port
*port2
);
305 int uart_suspend_port(struct uart_driver
*reg
, struct uart_port
*port
);
306 int uart_resume_port(struct uart_driver
*reg
, struct uart_port
*port
);
308 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
309 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
311 #define uart_circ_chars_pending(circ) \
312 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
314 #define uart_circ_chars_free(circ) \
315 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
317 static inline int uart_tx_stopped(struct uart_port
*port
)
319 struct tty_struct
*tty
= port
->state
->port
.tty
;
320 if(tty
->stopped
|| tty
->hw_stopped
)
326 * The following are helper functions for the low level drivers.
329 extern void uart_handle_dcd_change(struct uart_port
*uport
,
330 unsigned int status
);
331 extern void uart_handle_cts_change(struct uart_port
*uport
,
332 unsigned int status
);
334 extern void uart_insert_char(struct uart_port
*port
, unsigned int status
,
335 unsigned int overrun
, unsigned int ch
, unsigned int flag
);
339 uart_handle_sysrq_char(struct uart_port
*port
, unsigned int ch
)
342 if (ch
&& time_before(jiffies
, port
->sysrq
)) {
352 #define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
356 * We do the SysRQ and SAK checking like this...
358 static inline int uart_handle_break(struct uart_port
*port
)
360 struct uart_state
*state
= port
->state
;
362 if (port
->handle_break
)
363 port
->handle_break(port
);
366 if (port
->cons
&& port
->cons
->index
== port
->line
) {
368 port
->sysrq
= jiffies
+ HZ
*5;
374 if (port
->flags
& UPF_SAK
)
375 do_SAK(state
->port
.tty
);
380 * UART_ENABLE_MS - determine if port should enable modem status irqs
382 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
383 (cflag) & CRTSCTS || \
386 #endif /* LINUX_SERIAL_CORE_H */
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