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20#ifndef LINUX_SERIAL_CORE_H
21#define LINUX_SERIAL_CORE_H
22
23#include <linux/bitops.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>
33
34#ifdef CONFIG_SERIAL_CORE_CONSOLE
35#define uart_console(port) \
36 ((port)->cons && (port)->cons->index == (port)->line)
37#else
38#define uart_console(port) ({ (void)port; 0; })
39#endif
40
41struct uart_port;
42struct serial_struct;
43struct device;
44
45
46
47
48
49struct uart_ops {
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 *, struct ktermios *);
67 void (*pm)(struct uart_port *, unsigned int state,
68 unsigned int oldstate);
69
70
71
72
73 const char *(*type)(struct uart_port *);
74
75
76
77
78
79 void (*release_port)(struct uart_port *);
80
81
82
83
84
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 *);
93#endif
94};
95
96#define NO_POLL_CHAR 0x00ff0000
97#define UART_CONFIG_TYPE (1 << 0)
98#define UART_CONFIG_IRQ (1 << 1)
99
100struct uart_icount {
101 __u32 cts;
102 __u32 dsr;
103 __u32 rng;
104 __u32 dcd;
105 __u32 rx;
106 __u32 tx;
107 __u32 frame;
108 __u32 overrun;
109 __u32 parity;
110 __u32 brk;
111 __u32 buf_overrun;
112};
113
114typedef unsigned int __bitwise upf_t;
115typedef unsigned int __bitwise upstat_t;
116
117struct uart_port {
118 spinlock_t lock;
119 unsigned long iobase;
120 unsigned char __iomem *membase;
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 void (*set_ldisc)(struct uart_port *,
127 struct ktermios *);
128 unsigned int (*get_mctrl)(struct uart_port *);
129 void (*set_mctrl)(struct uart_port *, unsigned int);
130 int (*startup)(struct uart_port *port);
131 void (*shutdown)(struct uart_port *port);
132 void (*throttle)(struct uart_port *port);
133 void (*unthrottle)(struct uart_port *port);
134 int (*handle_irq)(struct uart_port *);
135 void (*pm)(struct uart_port *, unsigned int state,
136 unsigned int old);
137 void (*handle_break)(struct uart_port *);
138 int (*rs485_config)(struct uart_port *,
139 struct serial_rs485 *rs485);
140 unsigned int irq;
141 unsigned long irqflags;
142 unsigned int uartclk;
143 unsigned int fifosize;
144 unsigned char x_char;
145 unsigned char regshift;
146 unsigned char iotype;
147 unsigned char quirks;
148
149#define UPIO_PORT (SERIAL_IO_PORT)
150#define UPIO_HUB6 (SERIAL_IO_HUB6)
151#define UPIO_MEM (SERIAL_IO_MEM)
152#define UPIO_MEM32 (SERIAL_IO_MEM32)
153#define UPIO_AU (SERIAL_IO_AU)
154#define UPIO_TSI (SERIAL_IO_TSI)
155#define UPIO_MEM32BE (SERIAL_IO_MEM32BE)
156#define UPIO_MEM16 (SERIAL_IO_MEM16)
157
158
159#define UPQ_NO_TXEN_TEST BIT(0)
160
161 unsigned int read_status_mask;
162 unsigned int ignore_status_mask;
163 struct uart_state *state;
164 struct uart_icount icount;
165
166 struct console *cons;
167#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
168 unsigned long sysrq;
169#endif
170
171
172 upf_t flags;
173
174
175
176
177
178
179
180
181
182
183
184#define UPF_FOURPORT ((__force upf_t) ASYNC_FOURPORT )
185#define UPF_SAK ((__force upf_t) ASYNC_SAK )
186#define UPF_SPD_HI ((__force upf_t) ASYNC_SPD_HI )
187#define UPF_SPD_VHI ((__force upf_t) ASYNC_SPD_VHI )
188#define UPF_SPD_CUST ((__force upf_t) ASYNC_SPD_CUST )
189#define UPF_SPD_WARP ((__force upf_t) ASYNC_SPD_WARP )
190#define UPF_SPD_MASK ((__force upf_t) ASYNC_SPD_MASK )
191#define UPF_SKIP_TEST ((__force upf_t) ASYNC_SKIP_TEST )
192#define UPF_AUTO_IRQ ((__force upf_t) ASYNC_AUTO_IRQ )
193#define UPF_HARDPPS_CD ((__force upf_t) ASYNC_HARDPPS_CD )
194#define UPF_SPD_SHI ((__force upf_t) ASYNC_SPD_SHI )
195#define UPF_LOW_LATENCY ((__force upf_t) ASYNC_LOW_LATENCY )
196#define UPF_BUGGY_UART ((__force upf_t) ASYNC_BUGGY_UART )
197#define UPF_MAGIC_MULTIPLIER ((__force upf_t) ASYNC_MAGIC_MULTIPLIER )
198
199#define UPF_NO_THRE_TEST ((__force upf_t) (1 << 19))
200
201#define UPF_AUTO_CTS ((__force upf_t) (1 << 20))
202#define UPF_AUTO_RTS ((__force upf_t) (1 << 21))
203#define UPF_HARD_FLOW ((__force upf_t) (UPF_AUTO_CTS | UPF_AUTO_RTS))
204
205#define UPF_SOFT_FLOW ((__force upf_t) (1 << 22))
206#define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
207#define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
208#define UPF_EXAR_EFR ((__force upf_t) (1 << 25))
209#define UPF_BUG_THRE ((__force upf_t) (1 << 26))
210
211#define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
212#define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
213#define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
214#define UPF_DEAD ((__force upf_t) (1 << 30))
215#define UPF_IOREMAP ((__force upf_t) (1 << 31))
216
217#define __UPF_CHANGE_MASK 0x17fff
218#define UPF_CHANGE_MASK ((__force upf_t) __UPF_CHANGE_MASK)
219#define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
220
221#if __UPF_CHANGE_MASK > ASYNC_FLAGS
222#error Change mask not equivalent to userspace-visible bit defines
223#endif
224
225
226
227
228
229 upstat_t status;
230
231#define UPSTAT_CTS_ENABLE ((__force upstat_t) (1 << 0))
232#define UPSTAT_DCD_ENABLE ((__force upstat_t) (1 << 1))
233#define UPSTAT_AUTORTS ((__force upstat_t) (1 << 2))
234#define UPSTAT_AUTOCTS ((__force upstat_t) (1 << 3))
235#define UPSTAT_AUTOXOFF ((__force upstat_t) (1 << 4))
236
237 int hw_stopped;
238 unsigned int mctrl;
239 unsigned int timeout;
240 unsigned int type;
241 const struct uart_ops *ops;
242 unsigned int custom_divisor;
243 unsigned int line;
244 unsigned int minor;
245 resource_size_t mapbase;
246 resource_size_t mapsize;
247 struct device *dev;
248 unsigned char hub6;
249 unsigned char suspended;
250 unsigned char unused[2];
251 const char *name;
252 struct attribute_group *attr_group;
253 const struct attribute_group **tty_groups;
254 struct serial_rs485 rs485;
255 void *private_data;
256};
257
258static inline int serial_port_in(struct uart_port *up, int offset)
259{
260 return up->serial_in(up, offset);
261}
262
263static inline void serial_port_out(struct uart_port *up, int offset, int value)
264{
265 up->serial_out(up, offset, value);
266}
267
268
269
270
271
272
273
274enum uart_pm_state {
275 UART_PM_STATE_ON = 0,
276 UART_PM_STATE_OFF = 3,
277 UART_PM_STATE_UNDEFINED,
278};
279
280
281
282
283struct uart_state {
284 struct tty_port port;
285
286 enum uart_pm_state pm_state;
287 struct circ_buf xmit;
288
289 atomic_t refcount;
290 wait_queue_head_t remove_wait;
291 struct uart_port *uart_port;
292};
293
294#define UART_XMIT_SIZE PAGE_SIZE
295
296
297
298#define WAKEUP_CHARS 256
299
300struct module;
301struct tty_driver;
302
303struct uart_driver {
304 struct module *owner;
305 const char *driver_name;
306 const char *dev_name;
307 int major;
308 int minor;
309 int nr;
310 struct console *cons;
311
312
313
314
315
316 struct uart_state *state;
317 struct tty_driver *tty_driver;
318};
319
320void uart_write_wakeup(struct uart_port *port);
321
322
323
324
325void uart_update_timeout(struct uart_port *port, unsigned int cflag,
326 unsigned int baud);
327unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
328 struct ktermios *old, unsigned int min,
329 unsigned int max);
330unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
331
332
333static inline int uart_poll_timeout(struct uart_port *port)
334{
335 int timeout = port->timeout;
336
337 return timeout > 6 ? (timeout / 2 - 2) : 1;
338}
339
340
341
342
343struct earlycon_device {
344 struct console *con;
345 struct uart_port port;
346 char options[16];
347 unsigned int baud;
348};
349
350struct earlycon_id {
351 char name[16];
352 char compatible[128];
353 int (*setup)(struct earlycon_device *, const char *options);
354} __aligned(32);
355
356extern const struct earlycon_id __earlycon_table[];
357extern const struct earlycon_id __earlycon_table_end[];
358
359#if defined(CONFIG_SERIAL_EARLYCON) && !defined(MODULE)
360#define EARLYCON_USED_OR_UNUSED __used
361#else
362#define EARLYCON_USED_OR_UNUSED __maybe_unused
363#endif
364
365#define OF_EARLYCON_DECLARE(_name, compat, fn) \
366 static const struct earlycon_id __UNIQUE_ID(__earlycon_##_name) \
367 EARLYCON_USED_OR_UNUSED __section(__earlycon_table) \
368 = { .name = __stringify(_name), \
369 .compatible = compat, \
370 .setup = fn }
371
372#define EARLYCON_DECLARE(_name, fn) OF_EARLYCON_DECLARE(_name, "", fn)
373
374extern int of_setup_earlycon(const struct earlycon_id *match,
375 unsigned long node,
376 const char *options);
377
378#ifdef CONFIG_SERIAL_EARLYCON
379extern bool earlycon_init_is_deferred __initdata;
380int setup_earlycon(char *buf);
381#else
382static const bool earlycon_init_is_deferred;
383static inline int setup_earlycon(char *buf) { return 0; }
384#endif
385
386struct uart_port *uart_get_console(struct uart_port *ports, int nr,
387 struct console *c);
388int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
389 char **options);
390void uart_parse_options(char *options, int *baud, int *parity, int *bits,
391 int *flow);
392int uart_set_options(struct uart_port *port, struct console *co, int baud,
393 int parity, int bits, int flow);
394struct tty_driver *uart_console_device(struct console *co, int *index);
395void uart_console_write(struct uart_port *port, const char *s,
396 unsigned int count,
397 void (*putchar)(struct uart_port *, int));
398
399
400
401
402int uart_register_driver(struct uart_driver *uart);
403void uart_unregister_driver(struct uart_driver *uart);
404int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
405int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
406int uart_match_port(struct uart_port *port1, struct uart_port *port2);
407
408
409
410
411int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
412int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
413
414#define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
415#define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
416
417#define uart_circ_chars_pending(circ) \
418 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
419
420#define uart_circ_chars_free(circ) \
421 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
422
423static inline int uart_tx_stopped(struct uart_port *port)
424{
425 struct tty_struct *tty = port->state->port.tty;
426 if ((tty && tty->stopped) || port->hw_stopped)
427 return 1;
428 return 0;
429}
430
431static inline bool uart_cts_enabled(struct uart_port *uport)
432{
433 return !!(uport->status & UPSTAT_CTS_ENABLE);
434}
435
436static inline bool uart_softcts_mode(struct uart_port *uport)
437{
438 upstat_t mask = UPSTAT_CTS_ENABLE | UPSTAT_AUTOCTS;
439
440 return ((uport->status & mask) == UPSTAT_CTS_ENABLE);
441}
442
443
444
445
446
447extern void uart_handle_dcd_change(struct uart_port *uport,
448 unsigned int status);
449extern void uart_handle_cts_change(struct uart_port *uport,
450 unsigned int status);
451
452extern void uart_insert_char(struct uart_port *port, unsigned int status,
453 unsigned int overrun, unsigned int ch, unsigned int flag);
454
455#if defined(SUPPORT_SYSRQ) && defined(CONFIG_MAGIC_SYSRQ_SERIAL)
456static inline int
457uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
458{
459 if (port->sysrq) {
460 if (ch && time_before(jiffies, port->sysrq)) {
461 handle_sysrq(ch);
462 port->sysrq = 0;
463 return 1;
464 }
465 port->sysrq = 0;
466 }
467 return 0;
468}
469#else
470#define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
471#endif
472
473
474
475
476static inline int uart_handle_break(struct uart_port *port)
477{
478 struct uart_state *state = port->state;
479
480 if (port->handle_break)
481 port->handle_break(port);
482
483#ifdef SUPPORT_SYSRQ
484 if (port->cons && port->cons->index == port->line) {
485 if (!port->sysrq) {
486 port->sysrq = jiffies + HZ*5;
487 return 1;
488 }
489 port->sysrq = 0;
490 }
491#endif
492 if (port->flags & UPF_SAK)
493 do_SAK(state->port.tty);
494 return 0;
495}
496
497
498
499
500#define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
501 (cflag) & CRTSCTS || \
502 !((cflag) & CLOCAL))
503
504#endif
505