1 /*
2 * linux/drivers/char/serial_core.h
3 *
4 * Copyright (C) 2000 Deep Blue Solutions Ltd.
5 *
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.
10 *
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.
15 *
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
19 */
20 #ifndef LINUX_SERIAL_CORE_H
21 #define LINUX_SERIAL_CORE_H
22
23 #include <linux/serial.h>
24
25 /*
26 * The type definitions. These are from Ted Ts'o's serial.h
27 */
28 #define PORT_UNKNOWN 0
29 #define PORT_8250 1
30 #define PORT_16450 2
31 #define PORT_16550 3
32 #define PORT_16550A 4
33 #define PORT_CIRRUS 5
34 #define PORT_16650 6
35 #define PORT_16650V2 7
36 #define PORT_16750 8
37 #define PORT_STARTECH 9
38 #define PORT_16C950 10
39 #define PORT_16654 11
40 #define PORT_16850 12
41 #define PORT_RSA 13
42 #define PORT_NS16550A 14
43 #define PORT_XSCALE 15
44 #define PORT_RM9000 16 /* PMC-Sierra RM9xxx internal UART */
45 #define PORT_OCTEON 17 /* Cavium OCTEON internal UART */
46 #define PORT_AR7 18 /* Texas Instruments AR7 internal UART */
47 #define PORT_U6_16550A 19 /* ST-Ericsson U6xxx internal UART */
48 #define PORT_TEGRA 20 /* NVIDIA Tegra internal UART */
49 #define PORT_XR17D15X 21 /* Exar XR17D15x UART */
50 #define PORT_MAX_8250 21 /* max port ID */
51
52 /*
53 * ARM specific type numbers. These are not currently guaranteed
54 * to be implemented, and will change in the future. These are
55 * separate so any additions to the old serial.c that occur before
56 * we are merged can be easily merged here.
57 */
58 #define PORT_PXA 31
59 #define PORT_AMBA 32
60 #define PORT_CLPS711X 33
61 #define PORT_SA1100 34
62 #define PORT_UART00 35
63 #define PORT_21285 37
64
65 /* Sparc type numbers. */
66 #define PORT_SUNZILOG 38
67 #define PORT_SUNSAB 39
68
69 /* DEC */
70 #define PORT_DZ 46
71 #define PORT_ZS 47
72
73 /* Parisc type numbers. */
74 #define PORT_MUX 48
75
76 /* Atmel AT91 / AT32 SoC */
77 #define PORT_ATMEL 49
78
79 /* Macintosh Zilog type numbers */
80 #define PORT_MAC_ZILOG 50 /* m68k : not yet implemented */
81 #define PORT_PMAC_ZILOG 51
82
83 /* SH-SCI */
84 #define PORT_SCI 52
85 #define PORT_SCIF 53
86 #define PORT_IRDA 54
87
88 /* Samsung S3C2410 SoC and derivatives thereof */
89 #define PORT_S3C2410 55
90
91 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
92 #define PORT_IP22ZILOG 56
93
94 /* Sharp LH7a40x -- an ARM9 SoC series */
95 #define PORT_LH7A40X 57
96
97 /* PPC CPM type number */
98 #define PORT_CPM 58
99
100 /* MPC52xx (and MPC512x) type numbers */
101 #define PORT_MPC52xx 59
102
103 /* IBM icom */
104 #define PORT_ICOM 60
105
106 /* Samsung S3C2440 SoC */
107 #define PORT_S3C2440 61
108
109 /* Motorola i.MX SoC */
110 #define PORT_IMX 62
111
112 /* Marvell MPSC */
113 #define PORT_MPSC 63
114
115 /* TXX9 type number */
116 #define PORT_TXX9 64
117
118 /* NEC VR4100 series SIU/DSIU */
119 #define PORT_VR41XX_SIU 65
120 #define PORT_VR41XX_DSIU 66
121
122 /* Samsung S3C2400 SoC */
123 #define PORT_S3C2400 67
124
125 /* M32R SIO */
126 #define PORT_M32R_SIO 68
127
128 /*Digi jsm */
129 #define PORT_JSM 69
130
131 #define PORT_PNX8XXX 70
132
133 /* Hilscher netx */
134 #define PORT_NETX 71
135
136 /* SUN4V Hypervisor Console */
137 #define PORT_SUNHV 72
138
139 #define PORT_S3C2412 73
140
141 /* Xilinx uartlite */
142 #define PORT_UARTLITE 74
143
144 /* Blackfin bf5xx */
145 #define PORT_BFIN 75
146
147 /* Micrel KS8695 */
148 #define PORT_KS8695 76
149
150 /* Broadcom SB1250, etc. SOC */
151 #define PORT_SB1250_DUART 77
152
153 /* Freescale ColdFire */
154 #define PORT_MCF 78
155
156 /* Blackfin SPORT */
157 #define PORT_BFIN_SPORT 79
158
159 /* MN10300 on-chip UART numbers */
160 #define PORT_MN10300 80
161 #define PORT_MN10300_CTS 81
162
163 #define PORT_SC26XX 82
164
165 /* SH-SCI */
166 #define PORT_SCIFA 83
167
168 #define PORT_S3C6400 84
169
170 /* NWPSERIAL */
171 #define PORT_NWPSERIAL 85
172
173 /* MAX3100 */
174 #define PORT_MAX3100 86
175
176 /* Timberdale UART */
177 #define PORT_TIMBUART 87
178
179 /* Qualcomm MSM SoCs */
180 #define PORT_MSM 88
181
182 /* BCM63xx family SoCs */
183 #define PORT_BCM63XX 89
184
185 /* Aeroflex Gaisler GRLIB APBUART */
186 #define PORT_APBUART 90
187
188 /* Altera UARTs */
189 #define PORT_ALTERA_JTAGUART 91
190 #define PORT_ALTERA_UART 92
191
192 /* SH-SCI */
193 #define PORT_SCIFB 93
194
195 /* MAX3107 */
196 #define PORT_MAX3107 94
197
198 /* High Speed UART for Medfield */
199 #define PORT_MFD 95
200
201 /* TI OMAP-UART */
202 #define PORT_OMAP 96
203
204 /* VIA VT8500 SoC */
205 #define PORT_VT8500 97
206
207 /* Xilinx PSS UART */
208 #define PORT_XUARTPS 98
209
210 /* Atheros AR933X SoC */
211 #define PORT_AR933X 99
212
213 /* Energy Micro efm32 SoC */
214 #define PORT_EFMUART 100
215
216 #ifdef __KERNEL__
217
218 #include <linux/compiler.h>
219 #include <linux/interrupt.h>
220 #include <linux/circ_buf.h>
221 #include <linux/spinlock.h>
222 #include <linux/sched.h>
223 #include <linux/tty.h>
224 #include <linux/mutex.h>
225 #include <linux/sysrq.h>
226 #include <linux/pps_kernel.h>
227
228 struct uart_port;
229 struct serial_struct;
230 struct device;
231
232 /*
233 * This structure describes all the operations that can be
234 * done on the physical hardware.
235 */
236 struct uart_ops {
237 unsigned int (*tx_empty)(struct uart_port *);
238 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
239 unsigned int (*get_mctrl)(struct uart_port *);
240 void (*stop_tx)(struct uart_port *);
241 void (*start_tx)(struct uart_port *);
242 void (*send_xchar)(struct uart_port *, char ch);
243 void (*stop_rx)(struct uart_port *);
244 void (*enable_ms)(struct uart_port *);
245 void (*break_ctl)(struct uart_port *, int ctl);
246 int (*startup)(struct uart_port *);
247 void (*shutdown)(struct uart_port *);
248 void (*flush_buffer)(struct uart_port *);
249 void (*set_termios)(struct uart_port *, struct ktermios *new,
250 struct ktermios *old);
251 void (*set_ldisc)(struct uart_port *, int new);
252 void (*pm)(struct uart_port *, unsigned int state,
253 unsigned int oldstate);
254 int (*set_wake)(struct uart_port *, unsigned int state);
255 void (*wake_peer)(struct uart_port *);
256
257 /*
258 * Return a string describing the type of the port
259 */
260 const char *(*type)(struct uart_port *);
261
262 /*
263 * Release IO and memory resources used by the port.
264 * This includes iounmap if necessary.
265 */
266 void (*release_port)(struct uart_port *);
267
268 /*
269 * Request IO and memory resources used by the port.
270 * This includes iomapping the port if necessary.
271 */
272 int (*request_port)(struct uart_port *);
273 void (*config_port)(struct uart_port *, int);
274 int (*verify_port)(struct uart_port *, struct serial_struct *);
275 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
276 #ifdef CONFIG_CONSOLE_POLL
277 void (*poll_put_char)(struct uart_port *, unsigned char);
278 int (*poll_get_char)(struct uart_port *);
279 #endif
280 };
281
282 #define NO_POLL_CHAR 0x00ff0000
283 #define UART_CONFIG_TYPE (1 << 0)
284 #define UART_CONFIG_IRQ (1 << 1)
285
286 struct uart_icount {
287 __u32 cts;
288 __u32 dsr;
289 __u32 rng;
290 __u32 dcd;
291 __u32 rx;
292 __u32 tx;
293 __u32 frame;
294 __u32 overrun;
295 __u32 parity;
296 __u32 brk;
297 __u32 buf_overrun;
298 };
299
300 typedef unsigned int __bitwise__ upf_t;
301
302 struct uart_port {
303 spinlock_t lock; /* port lock */
304 unsigned long iobase; /* in/out[bwl] */
305 unsigned char __iomem *membase; /* read/write[bwl] */
306 unsigned int (*serial_in)(struct uart_port *, int);
307 void (*serial_out)(struct uart_port *, int, int);
308 void (*set_termios)(struct uart_port *,
309 struct ktermios *new,
310 struct ktermios *old);
311 int (*handle_irq)(struct uart_port *);
312 void (*pm)(struct uart_port *, unsigned int state,
313 unsigned int old);
314 unsigned int irq; /* irq number */
315 unsigned long irqflags; /* irq flags */
316 unsigned int uartclk; /* base uart clock */
317 unsigned int fifosize; /* tx fifo size */
318 unsigned char x_char; /* xon/xoff char */
319 unsigned char regshift; /* reg offset shift */
320 unsigned char iotype; /* io access style */
321 unsigned char unused1;
322
323 #define UPIO_PORT (0)
324 #define UPIO_HUB6 (1)
325 #define UPIO_MEM (2)
326 #define UPIO_MEM32 (3)
327 #define UPIO_AU (4) /* Au1x00 type IO */
328 #define UPIO_TSI (5) /* Tsi108/109 type IO */
329 #define UPIO_RM9000 (6) /* RM9000 type IO */
330
331 unsigned int read_status_mask; /* driver specific */
332 unsigned int ignore_status_mask; /* driver specific */
333 struct uart_state *state; /* pointer to parent state */
334 struct uart_icount icount; /* statistics */
335
336 struct console *cons; /* struct console, if any */
337 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
338 unsigned long sysrq; /* sysrq timeout */
339 #endif
340
341 upf_t flags;
342
343 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
344 #define UPF_SAK ((__force upf_t) (1 << 2))
345 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
346 #define UPF_SPD_HI ((__force upf_t) (0x0010))
347 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
348 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
349 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
350 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
351 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
352 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
353 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
354 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
355 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
356 #define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15))
357 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
358 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
359 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
360 #define UPF_EXAR_EFR ((__force upf_t) (1 << 25))
361 #define UPF_BUG_THRE ((__force upf_t) (1 << 26))
362 /* The exact UART type is known and should not be probed. */
363 #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
364 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
365 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
366 #define UPF_DEAD ((__force upf_t) (1 << 30))
367 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
368
369 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
370 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
371
372 unsigned int mctrl; /* current modem ctrl settings */
373 unsigned int timeout; /* character-based timeout */
374 unsigned int type; /* port type */
375 const struct uart_ops *ops;
376 unsigned int custom_divisor;
377 unsigned int line; /* port index */
378 resource_size_t mapbase; /* for ioremap */
379 struct device *dev; /* parent device */
380 unsigned char hub6; /* this should be in the 8250 driver */
381 unsigned char suspended;
382 unsigned char irq_wake;
383 unsigned char unused[2];
384 void *private_data; /* generic platform data pointer */
385 };
386
serial_port_in(struct uart_port * up,int offset)387 static inline int serial_port_in(struct uart_port *up, int offset)
388 {
389 return up->serial_in(up, offset);
390 }
391
serial_port_out(struct uart_port * up,int offset,int value)392 static inline void serial_port_out(struct uart_port *up, int offset, int value)
393 {
394 up->serial_out(up, offset, value);
395 }
396
397 /*
398 * This is the state information which is persistent across opens.
399 */
400 struct uart_state {
401 struct tty_port port;
402
403 int pm_state;
404 struct circ_buf xmit;
405
406 struct uart_port *uart_port;
407 };
408
409 #define UART_XMIT_SIZE PAGE_SIZE
410
411
412 /* number of characters left in xmit buffer before we ask for more */
413 #define WAKEUP_CHARS 256
414
415 struct module;
416 struct tty_driver;
417
418 struct uart_driver {
419 struct module *owner;
420 const char *driver_name;
421 const char *dev_name;
422 int major;
423 int minor;
424 int nr;
425 struct console *cons;
426
427 /*
428 * these are private; the low level driver should not
429 * touch these; they should be initialised to NULL
430 */
431 struct uart_state *state;
432 struct tty_driver *tty_driver;
433 };
434
435 void uart_write_wakeup(struct uart_port *port);
436
437 /*
438 * Baud rate helpers.
439 */
440 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
441 unsigned int baud);
442 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
443 struct ktermios *old, unsigned int min,
444 unsigned int max);
445 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
446
447 /* Base timer interval for polling */
uart_poll_timeout(struct uart_port * port)448 static inline int uart_poll_timeout(struct uart_port *port)
449 {
450 int timeout = port->timeout;
451
452 return timeout > 6 ? (timeout / 2 - 2) : 1;
453 }
454
455 /*
456 * Console helpers.
457 */
458 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
459 struct console *c);
460 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
461 int *flow);
462 int uart_set_options(struct uart_port *port, struct console *co, int baud,
463 int parity, int bits, int flow);
464 struct tty_driver *uart_console_device(struct console *co, int *index);
465 void uart_console_write(struct uart_port *port, const char *s,
466 unsigned int count,
467 void (*putchar)(struct uart_port *, int));
468
469 /*
470 * Port/driver registration/removal
471 */
472 int uart_register_driver(struct uart_driver *uart);
473 void uart_unregister_driver(struct uart_driver *uart);
474 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
475 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
476 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
477
478 /*
479 * Power Management
480 */
481 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
482 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
483
484 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
485 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
486
487 #define uart_circ_chars_pending(circ) \
488 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
489
490 #define uart_circ_chars_free(circ) \
491 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
492
uart_tx_stopped(struct uart_port * port)493 static inline int uart_tx_stopped(struct uart_port *port)
494 {
495 struct tty_struct *tty = port->state->port.tty;
496 if(tty->stopped || tty->hw_stopped)
497 return 1;
498 return 0;
499 }
500
501 /*
502 * The following are helper functions for the low level drivers.
503 */
504
505 extern void uart_handle_dcd_change(struct uart_port *uport,
506 unsigned int status);
507 extern void uart_handle_cts_change(struct uart_port *uport,
508 unsigned int status);
509
510 extern void uart_insert_char(struct uart_port *port, unsigned int status,
511 unsigned int overrun, unsigned int ch, unsigned int flag);
512
513 #ifdef SUPPORT_SYSRQ
514 static inline int
uart_handle_sysrq_char(struct uart_port * port,unsigned int ch)515 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
516 {
517 if (port->sysrq) {
518 if (ch && time_before(jiffies, port->sysrq)) {
519 handle_sysrq(ch);
520 port->sysrq = 0;
521 return 1;
522 }
523 port->sysrq = 0;
524 }
525 return 0;
526 }
527 #else
528 #define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
529 #endif
530
531 /*
532 * We do the SysRQ and SAK checking like this...
533 */
uart_handle_break(struct uart_port * port)534 static inline int uart_handle_break(struct uart_port *port)
535 {
536 struct uart_state *state = port->state;
537 #ifdef SUPPORT_SYSRQ
538 if (port->cons && port->cons->index == port->line) {
539 if (!port->sysrq) {
540 port->sysrq = jiffies + HZ*5;
541 return 1;
542 }
543 port->sysrq = 0;
544 }
545 #endif
546 if (port->flags & UPF_SAK)
547 do_SAK(state->port.tty);
548 return 0;
549 }
550
551 /*
552 * UART_ENABLE_MS - determine if port should enable modem status irqs
553 */
554 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
555 (cflag) & CRTSCTS || \
556 !((cflag) & CLOCAL))
557
558 #endif
559
560 #endif /* LINUX_SERIAL_CORE_H */
561