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
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 <linux/pps_kernel.h>
33 #include <uapi/linux/serial_core.h>
35 struct uart_port;
36 struct serial_struct;
37 struct device;
39 /*
40 * This structure describes all the operations that can be
41 * done on the physical hardware.
42 */
43 struct uart_ops {
44 unsigned int (*tx_empty)(struct uart_port *);
45 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
46 unsigned int (*get_mctrl)(struct uart_port *);
47 void (*stop_tx)(struct uart_port *);
48 void (*start_tx)(struct uart_port *);
49 void (*throttle)(struct uart_port *);
50 void (*unthrottle)(struct uart_port *);
51 void (*send_xchar)(struct uart_port *, char ch);
52 void (*stop_rx)(struct uart_port *);
53 void (*enable_ms)(struct uart_port *);
54 void (*break_ctl)(struct uart_port *, int ctl);
55 int (*startup)(struct uart_port *);
56 void (*shutdown)(struct uart_port *);
57 void (*flush_buffer)(struct uart_port *);
58 void (*set_termios)(struct uart_port *, struct ktermios *new,
59 struct ktermios *old);
60 void (*set_ldisc)(struct uart_port *, int new);
61 void (*pm)(struct uart_port *, unsigned int state,
62 unsigned int oldstate);
63 int (*set_wake)(struct uart_port *, unsigned int state);
64 void (*wake_peer)(struct uart_port *);
66 /*
67 * Return a string describing the type of the port
68 */
69 const char *(*type)(struct uart_port *);
71 /*
72 * Release IO and memory resources used by the port.
73 * This includes iounmap if necessary.
74 */
75 void (*release_port)(struct uart_port *);
77 /*
78 * Request IO and memory resources used by the port.
79 * This includes iomapping the port if necessary.
80 */
81 int (*request_port)(struct uart_port *);
82 void (*config_port)(struct uart_port *, int);
83 int (*verify_port)(struct uart_port *, struct serial_struct *);
84 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
85 #ifdef CONFIG_CONSOLE_POLL
86 int (*poll_init)(struct uart_port *);
87 void (*poll_put_char)(struct uart_port *, unsigned char);
88 int (*poll_get_char)(struct uart_port *);
89 #endif
90 };
92 #define NO_POLL_CHAR 0x00ff0000
93 #define UART_CONFIG_TYPE (1 << 0)
94 #define UART_CONFIG_IRQ (1 << 1)
96 struct uart_icount {
97 __u32 cts;
98 __u32 dsr;
99 __u32 rng;
100 __u32 dcd;
101 __u32 rx;
102 __u32 tx;
103 __u32 frame;
104 __u32 overrun;
105 __u32 parity;
106 __u32 brk;
107 __u32 buf_overrun;
108 };
110 typedef unsigned int __bitwise__ upf_t;
112 struct uart_port {
113 spinlock_t lock; /* port lock */
114 unsigned long iobase; /* in/out[bwl] */
115 unsigned char __iomem *membase; /* read/write[bwl] */
116 unsigned int (*serial_in)(struct uart_port *, int);
117 void (*serial_out)(struct uart_port *, int, int);
118 void (*set_termios)(struct uart_port *,
119 struct ktermios *new,
120 struct ktermios *old);
121 int (*handle_irq)(struct uart_port *);
122 void (*pm)(struct uart_port *, unsigned int state,
123 unsigned int old);
124 void (*handle_break)(struct uart_port *);
125 unsigned int irq; /* irq number */
126 unsigned long irqflags; /* irq flags */
127 unsigned int uartclk; /* base uart clock */
128 unsigned int fifosize; /* tx fifo size */
129 unsigned char x_char; /* xon/xoff char */
130 unsigned char regshift; /* reg offset shift */
131 unsigned char iotype; /* io access style */
132 unsigned char unused1;
134 #define UPIO_PORT (0)
135 #define UPIO_HUB6 (1)
136 #define UPIO_MEM (2)
137 #define UPIO_MEM32 (3)
138 #define UPIO_AU (4) /* Au1x00 type IO */
139 #define UPIO_TSI (5) /* Tsi108/109 type IO */
140 #define UPIO_RM9000 (6) /* RM9000 type IO */
142 unsigned int read_status_mask; /* driver specific */
143 unsigned int ignore_status_mask; /* driver specific */
144 struct uart_state *state; /* pointer to parent state */
145 struct uart_icount icount; /* statistics */
147 struct console *cons; /* struct console, if any */
148 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
149 unsigned long sysrq; /* sysrq timeout */
150 #endif
152 upf_t flags;
154 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
155 #define UPF_SAK ((__force upf_t) (1 << 2))
156 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
157 #define UPF_SPD_HI ((__force upf_t) (0x0010))
158 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
159 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
160 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
161 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
162 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
163 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
164 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
165 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
166 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
167 #define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15))
168 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
169 /* Port has hardware-assisted h/w flow control (iow, auto-RTS *not* auto-CTS) */
170 #define UPF_HARD_FLOW ((__force upf_t) (1 << 21))
171 /* Port has hardware-assisted s/w flow control */
172 #define UPF_SOFT_FLOW ((__force upf_t) (1 << 22))
173 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
174 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
175 #define UPF_EXAR_EFR ((__force upf_t) (1 << 25))
176 #define UPF_BUG_THRE ((__force upf_t) (1 << 26))
177 /* The exact UART type is known and should not be probed. */
178 #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
179 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
180 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
181 #define UPF_DEAD ((__force upf_t) (1 << 30))
182 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
184 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
185 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
187 unsigned int mctrl; /* current modem ctrl settings */
188 unsigned int timeout; /* character-based timeout */
189 unsigned int type; /* port type */
190 const struct uart_ops *ops;
191 unsigned int custom_divisor;
192 unsigned int line; /* port index */
193 resource_size_t mapbase; /* for ioremap */
194 struct device *dev; /* parent device */
195 unsigned char hub6; /* this should be in the 8250 driver */
196 unsigned char suspended;
197 unsigned char irq_wake;
198 unsigned char unused[2];
199 void *private_data; /* generic platform data pointer */
200 };
202 static inline int serial_port_in(struct uart_port *up, int offset)
203 {
204 return up->serial_in(up, offset);
205 }
207 static inline void serial_port_out(struct uart_port *up, int offset, int value)
208 {
209 up->serial_out(up, offset, value);
210 }
212 /*
213 * This is the state information which is persistent across opens.
214 */
215 struct uart_state {
216 struct tty_port port;
218 int pm_state;
219 struct circ_buf xmit;
221 struct uart_port *uart_port;
222 };
224 #define UART_XMIT_SIZE PAGE_SIZE
227 /* number of characters left in xmit buffer before we ask for more */
228 #define WAKEUP_CHARS 256
230 struct module;
231 struct tty_driver;
233 struct uart_driver {
234 struct module *owner;
235 const char *driver_name;
236 const char *dev_name;
237 int major;
238 int minor;
239 int nr;
240 struct console *cons;
242 /*
243 * these are private; the low level driver should not
244 * touch these; they should be initialised to NULL
245 */
246 struct uart_state *state;
247 struct tty_driver *tty_driver;
248 };
250 void uart_write_wakeup(struct uart_port *port);
252 /*
253 * Baud rate helpers.
254 */
255 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
256 unsigned int baud);
257 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
258 struct ktermios *old, unsigned int min,
259 unsigned int max);
260 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
262 /* Base timer interval for polling */
263 static inline int uart_poll_timeout(struct uart_port *port)
264 {
265 int timeout = port->timeout;
267 return timeout > 6 ? (timeout / 2 - 2) : 1;
268 }
270 /*
271 * Console helpers.
272 */
273 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
274 struct console *c);
275 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
276 int *flow);
277 int uart_set_options(struct uart_port *port, struct console *co, int baud,
278 int parity, int bits, int flow);
279 struct tty_driver *uart_console_device(struct console *co, int *index);
280 void uart_console_write(struct uart_port *port, const char *s,
281 unsigned int count,
282 void (*putchar)(struct uart_port *, int));
284 /*
285 * Port/driver registration/removal
286 */
287 int uart_register_driver(struct uart_driver *uart);
288 void uart_unregister_driver(struct uart_driver *uart);
289 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
290 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
291 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
293 /*
294 * Power Management
295 */
296 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
297 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
299 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
300 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
302 #define uart_circ_chars_pending(circ) \
303 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
305 #define uart_circ_chars_free(circ) \
306 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
308 static inline int uart_tx_stopped(struct uart_port *port)
309 {
310 struct tty_struct *tty = port->state->port.tty;
311 if(tty->stopped || tty->hw_stopped)
312 return 1;
313 return 0;
314 }
316 /*
317 * The following are helper functions for the low level drivers.
318 */
320 extern void uart_handle_dcd_change(struct uart_port *uport,
321 unsigned int status);
322 extern void uart_handle_cts_change(struct uart_port *uport,
323 unsigned int status);
325 extern void uart_insert_char(struct uart_port *port, unsigned int status,
326 unsigned int overrun, unsigned int ch, unsigned int flag);
328 #ifdef SUPPORT_SYSRQ
329 static inline int
330 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
331 {
332 if (port->sysrq) {
333 if (ch && time_before(jiffies, port->sysrq)) {
334 handle_sysrq(ch);
335 port->sysrq = 0;
336 return 1;
337 }
338 port->sysrq = 0;
339 }
340 return 0;
341 }
342 #else
343 #define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
344 #endif
346 /*
347 * We do the SysRQ and SAK checking like this...
348 */
349 static inline int uart_handle_break(struct uart_port *port)
350 {
351 struct uart_state *state = port->state;
353 if (port->handle_break)
354 port->handle_break(port);
356 #ifdef SUPPORT_SYSRQ
357 if (port->cons && port->cons->index == port->line) {
358 if (!port->sysrq) {
359 port->sysrq = jiffies + HZ*5;
360 return 1;
361 }
362 port->sysrq = 0;
363 }
364 #endif
365 if (port->flags & UPF_SAK)
366 do_SAK(state->port.tty);
367 return 0;
368 }
370 /*
371 * UART_ENABLE_MS - determine if port should enable modem status irqs
372 */
373 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
374 (cflag) & CRTSCTS || \
375 !((cflag) & CLOCAL))
377 #endif /* LINUX_SERIAL_CORE_H */