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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>
34 #ifdef CONFIG_SERIAL_CORE_CONSOLE
35 #define uart_console(port) \
36 ((port)->cons && (port)->cons->index == (port)->line)
38 #define uart_console(port) (0)
46 * This structure describes all the operations that can be done on the
47 * physical hardware. See Documentation/serial/driver for details.
50 unsigned int (*tx_empty
)(struct uart_port
*);
51 void (*set_mctrl
)(struct uart_port
*, unsigned int mctrl
);
52 unsigned int (*get_mctrl
)(struct uart_port
*);
53 void (*stop_tx
)(struct uart_port
*);
54 void (*start_tx
)(struct uart_port
*);
55 void (*throttle
)(struct uart_port
*);
56 void (*unthrottle
)(struct uart_port
*);
57 void (*send_xchar
)(struct uart_port
*, char ch
);
58 void (*stop_rx
)(struct uart_port
*);
59 void (*enable_ms
)(struct uart_port
*);
60 void (*break_ctl
)(struct uart_port
*, int ctl
);
61 int (*startup
)(struct uart_port
*);
62 void (*shutdown
)(struct uart_port
*);
63 void (*flush_buffer
)(struct uart_port
*);
64 void (*set_termios
)(struct uart_port
*, struct ktermios
*new,
65 struct ktermios
*old
);
66 void (*set_ldisc
)(struct uart_port
*, int new);
67 void (*pm
)(struct uart_port
*, unsigned int state
,
68 unsigned int oldstate
);
71 * Return a string describing the type of the port
73 const char *(*type
)(struct uart_port
*);
76 * Release IO and memory resources used by the port.
77 * This includes iounmap if necessary.
79 void (*release_port
)(struct uart_port
*);
82 * Request IO and memory resources used by the port.
83 * This includes iomapping the port if necessary.
85 int (*request_port
)(struct uart_port
*);
86 void (*config_port
)(struct uart_port
*, int);
87 int (*verify_port
)(struct uart_port
*, struct serial_struct
*);
88 int (*ioctl
)(struct uart_port
*, unsigned int, unsigned long);
89 #ifdef CONFIG_CONSOLE_POLL
90 int (*poll_init
)(struct uart_port
*);
91 void (*poll_put_char
)(struct uart_port
*, unsigned char);
92 int (*poll_get_char
)(struct uart_port
*);
96 #define NO_POLL_CHAR 0x00ff0000
97 #define UART_CONFIG_TYPE (1 << 0)
98 #define UART_CONFIG_IRQ (1 << 1)
114 typedef unsigned int __bitwise__ upf_t
;
115 typedef unsigned int __bitwise__ upstat_t
;
118 spinlock_t lock
; /* port lock */
119 unsigned long iobase
; /* in/out[bwl] */
120 unsigned char __iomem
*membase
; /* read/write[bwl] */
121 unsigned int (*serial_in
)(struct uart_port
*, int);
122 void (*serial_out
)(struct uart_port
*, int, int);
123 void (*set_termios
)(struct uart_port
*,
124 struct ktermios
*new,
125 struct ktermios
*old
);
126 int (*startup
)(struct uart_port
*port
);
127 void (*shutdown
)(struct uart_port
*port
);
128 void (*throttle
)(struct uart_port
*port
);
129 void (*unthrottle
)(struct uart_port
*port
);
130 int (*handle_irq
)(struct uart_port
*);
131 void (*pm
)(struct uart_port
*, unsigned int state
,
133 void (*handle_break
)(struct uart_port
*);
134 unsigned int irq
; /* irq number */
135 unsigned long irqflags
; /* irq flags */
136 unsigned int uartclk
; /* base uart clock */
137 unsigned int fifosize
; /* tx fifo size */
138 unsigned char x_char
; /* xon/xoff char */
139 unsigned char regshift
; /* reg offset shift */
140 unsigned char iotype
; /* io access style */
141 unsigned char unused1
;
143 #define UPIO_PORT (0)
144 #define UPIO_HUB6 (1)
146 #define UPIO_MEM32 (3)
147 #define UPIO_AU (4) /* Au1x00 and RT288x type IO */
148 #define UPIO_TSI (5) /* Tsi108/109 type IO */
150 unsigned int read_status_mask
; /* driver specific */
151 unsigned int ignore_status_mask
; /* driver specific */
152 struct uart_state
*state
; /* pointer to parent state */
153 struct uart_icount icount
; /* statistics */
155 struct console
*cons
; /* struct console, if any */
156 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
157 unsigned long sysrq
; /* sysrq timeout */
160 /* flags must be updated while holding port mutex */
163 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
164 #define UPF_SAK ((__force upf_t) (1 << 2))
165 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
166 #define UPF_SPD_HI ((__force upf_t) (0x0010))
167 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
168 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
169 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
170 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
171 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
172 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
173 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
174 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
175 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
176 #define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15))
177 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
178 /* Port has hardware-assisted h/w flow control (iow, auto-RTS *not* auto-CTS) */
179 #define UPF_HARD_FLOW ((__force upf_t) (1 << 21))
180 /* Port has hardware-assisted s/w flow control */
181 #define UPF_SOFT_FLOW ((__force upf_t) (1 << 22))
182 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
183 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
184 #define UPF_EXAR_EFR ((__force upf_t) (1 << 25))
185 #define UPF_BUG_THRE ((__force upf_t) (1 << 26))
186 /* The exact UART type is known and should not be probed. */
187 #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
188 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
189 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
190 #define UPF_DEAD ((__force upf_t) (1 << 30))
191 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
193 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
194 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
196 /* status must be updated while holding port lock */
199 #define UPSTAT_CTS_ENABLE ((__force upstat_t) (1 << 0))
200 #define UPSTAT_DCD_ENABLE ((__force upstat_t) (1 << 1))
202 int hw_stopped
; /* sw-assisted CTS flow state */
203 unsigned int mctrl
; /* current modem ctrl settings */
204 unsigned int timeout
; /* character-based timeout */
205 unsigned int type
; /* port type */
206 const struct uart_ops
*ops
;
207 unsigned int custom_divisor
;
208 unsigned int line
; /* port index */
209 resource_size_t mapbase
; /* for ioremap */
210 struct device
*dev
; /* parent device */
211 unsigned char hub6
; /* this should be in the 8250 driver */
212 unsigned char suspended
;
213 unsigned char irq_wake
;
214 unsigned char unused
[2];
215 struct attribute_group
*attr_group
; /* port specific attributes */
216 const struct attribute_group
**tty_groups
; /* all attributes (serial core use only) */
217 void *private_data
; /* generic platform data pointer */
220 static inline int serial_port_in(struct uart_port
*up
, int offset
)
222 return up
->serial_in(up
, offset
);
225 static inline void serial_port_out(struct uart_port
*up
, int offset
, int value
)
227 up
->serial_out(up
, offset
, value
);
231 * enum uart_pm_state - power states for UARTs
232 * @UART_PM_STATE_ON: UART is powered, up and operational
233 * @UART_PM_STATE_OFF: UART is powered off
234 * @UART_PM_STATE_UNDEFINED: sentinel
237 UART_PM_STATE_ON
= 0,
238 UART_PM_STATE_OFF
= 3, /* number taken from ACPI */
239 UART_PM_STATE_UNDEFINED
,
243 * This is the state information which is persistent across opens.
246 struct tty_port port
;
248 enum uart_pm_state pm_state
;
249 struct circ_buf xmit
;
251 struct uart_port
*uart_port
;
254 #define UART_XMIT_SIZE PAGE_SIZE
257 /* number of characters left in xmit buffer before we ask for more */
258 #define WAKEUP_CHARS 256
264 struct module
*owner
;
265 const char *driver_name
;
266 const char *dev_name
;
270 struct console
*cons
;
273 * these are private; the low level driver should not
274 * touch these; they should be initialised to NULL
276 struct uart_state
*state
;
277 struct tty_driver
*tty_driver
;
280 void uart_write_wakeup(struct uart_port
*port
);
285 void uart_update_timeout(struct uart_port
*port
, unsigned int cflag
,
287 unsigned int uart_get_baud_rate(struct uart_port
*port
, struct ktermios
*termios
,
288 struct ktermios
*old
, unsigned int min
,
290 unsigned int uart_get_divisor(struct uart_port
*port
, unsigned int baud
);
292 /* Base timer interval for polling */
293 static inline int uart_poll_timeout(struct uart_port
*port
)
295 int timeout
= port
->timeout
;
297 return timeout
> 6 ? (timeout
/ 2 - 2) : 1;
303 struct earlycon_device
{
305 struct uart_port port
;
306 char options
[16]; /* e.g., 115200n8 */
309 int setup_earlycon(char *buf
, const char *match
,
310 int (*setup
)(struct earlycon_device
*, const char *));
312 extern int of_setup_earlycon(unsigned long addr
,
313 int (*setup
)(struct earlycon_device
*, const char *));
315 #define EARLYCON_DECLARE(name, func) \
316 static int __init name ## _setup_earlycon(char *buf) \
318 return setup_earlycon(buf, __stringify(name), func); \
320 early_param("earlycon", name ## _setup_earlycon);
322 #define OF_EARLYCON_DECLARE(name, compat, fn) \
323 _OF_DECLARE(earlycon, name, compat, fn, void *)
325 struct uart_port
*uart_get_console(struct uart_port
*ports
, int nr
,
327 void uart_parse_options(char *options
, int *baud
, int *parity
, int *bits
,
329 int uart_set_options(struct uart_port
*port
, struct console
*co
, int baud
,
330 int parity
, int bits
, int flow
);
331 struct tty_driver
*uart_console_device(struct console
*co
, int *index
);
332 void uart_console_write(struct uart_port
*port
, const char *s
,
334 void (*putchar
)(struct uart_port
*, int));
337 * Port/driver registration/removal
339 int uart_register_driver(struct uart_driver
*uart
);
340 void uart_unregister_driver(struct uart_driver
*uart
);
341 int uart_add_one_port(struct uart_driver
*reg
, struct uart_port
*port
);
342 int uart_remove_one_port(struct uart_driver
*reg
, struct uart_port
*port
);
343 int uart_match_port(struct uart_port
*port1
, struct uart_port
*port2
);
348 int uart_suspend_port(struct uart_driver
*reg
, struct uart_port
*port
);
349 int uart_resume_port(struct uart_driver
*reg
, struct uart_port
*port
);
351 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
352 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
354 #define uart_circ_chars_pending(circ) \
355 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
357 #define uart_circ_chars_free(circ) \
358 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
360 static inline int uart_tx_stopped(struct uart_port
*port
)
362 struct tty_struct
*tty
= port
->state
->port
.tty
;
363 if (tty
->stopped
|| port
->hw_stopped
)
368 static inline bool uart_cts_enabled(struct uart_port
*uport
)
370 return uport
->status
& UPSTAT_CTS_ENABLE
;
374 * The following are helper functions for the low level drivers.
377 extern void uart_handle_dcd_change(struct uart_port
*uport
,
378 unsigned int status
);
379 extern void uart_handle_cts_change(struct uart_port
*uport
,
380 unsigned int status
);
382 extern void uart_insert_char(struct uart_port
*port
, unsigned int status
,
383 unsigned int overrun
, unsigned int ch
, unsigned int flag
);
387 uart_handle_sysrq_char(struct uart_port
*port
, unsigned int ch
)
390 if (ch
&& time_before(jiffies
, port
->sysrq
)) {
400 #define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
404 * We do the SysRQ and SAK checking like this...
406 static inline int uart_handle_break(struct uart_port
*port
)
408 struct uart_state
*state
= port
->state
;
410 if (port
->handle_break
)
411 port
->handle_break(port
);
414 if (port
->cons
&& port
->cons
->index
== port
->line
) {
416 port
->sysrq
= jiffies
+ HZ
*5;
422 if (port
->flags
& UPF_SAK
)
423 do_SAK(state
->port
.tty
);
428 * UART_ENABLE_MS - determine if port should enable modem status irqs
430 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
431 (cflag) & CRTSCTS || \
434 #endif /* LINUX_SERIAL_CORE_H */