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 * The type definitions. These are from Ted Ts'o's serial.h
26 #define PORT_UNKNOWN 0
33 #define PORT_16650V2 7
35 #define PORT_STARTECH 9
36 #define PORT_16C950 10
40 #define PORT_NS16550A 14
41 #define PORT_XSCALE 15
42 #define PORT_RM9000 16 /* PMC-Sierra RM9xxx internal UART */
43 #define PORT_OCTEON 17 /* Cavium OCTEON internal UART */
44 #define PORT_AR7 18 /* Texas Instruments AR7 internal UART */
45 #define PORT_MAX_8250 18 /* max port ID */
48 * ARM specific type numbers. These are not currently guaranteed
49 * to be implemented, and will change in the future. These are
50 * separate so any additions to the old serial.c that occur before
51 * we are merged can be easily merged here.
55 #define PORT_CLPS711X 33
56 #define PORT_SA1100 34
57 #define PORT_UART00 35
60 /* Sparc type numbers. */
61 #define PORT_SUNZILOG 38
62 #define PORT_SUNSAB 39
68 /* Parisc type numbers. */
71 /* Atmel AT91 / AT32 SoC */
74 /* Macintosh Zilog type numbers */
75 #define PORT_MAC_ZILOG 50 /* m68k : not yet implemented */
76 #define PORT_PMAC_ZILOG 51
83 /* Samsung S3C2410 SoC and derivatives thereof */
84 #define PORT_S3C2410 55
86 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
87 #define PORT_IP22ZILOG 56
89 /* Sharp LH7a40x -- an ARM9 SoC series */
90 #define PORT_LH7A40X 57
92 /* PPC CPM type number */
95 /* MPC52xx type numbers */
96 #define PORT_MPC52xx 59
101 /* Samsung S3C2440 SoC */
102 #define PORT_S3C2440 61
104 /* Motorola i.MX SoC */
110 /* TXX9 type number */
113 /* NEC VR4100 series SIU/DSIU */
114 #define PORT_VR41XX_SIU 65
115 #define PORT_VR41XX_DSIU 66
117 /* Samsung S3C2400 SoC */
118 #define PORT_S3C2400 67
121 #define PORT_M32R_SIO 68
126 #define PORT_PNX8XXX 70
131 /* SUN4V Hypervisor Console */
132 #define PORT_SUNHV 72
134 #define PORT_S3C2412 73
136 /* Xilinx uartlite */
137 #define PORT_UARTLITE 74
143 #define PORT_KS8695 76
145 /* Broadcom SB1250, etc. SOC */
146 #define PORT_SB1250_DUART 77
148 /* Freescale ColdFire */
152 #define PORT_BFIN_SPORT 79
154 /* MN10300 on-chip UART numbers */
155 #define PORT_MN10300 80
156 #define PORT_MN10300_CTS 81
158 #define PORT_SC26XX 82
161 #define PORT_SCIFA 83
163 #define PORT_S3C6400 84
166 #define PORT_NWPSERIAL 85
169 #define PORT_MAX3100 86
171 /* Timberdale UART */
172 #define PORT_TIMBUART 87
174 /* Qualcomm MSM SoCs */
179 #include <linux/compiler.h>
180 #include <linux/interrupt.h>
181 #include <linux/circ_buf.h>
182 #include <linux/spinlock.h>
183 #include <linux/sched.h>
184 #include <linux/tty.h>
185 #include <linux/mutex.h>
186 #include <linux/sysrq.h>
190 struct serial_struct;
194 * This structure describes all the operations that can be
195 * done on the physical hardware.
198 unsigned int (*tx_empty)(struct uart_port *);
199 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
200 unsigned int (*get_mctrl)(struct uart_port *);
201 void (*stop_tx)(struct uart_port *);
202 void (*start_tx)(struct uart_port *);
203 void (*send_xchar)(struct uart_port *, char ch);
204 void (*stop_rx)(struct uart_port *);
205 void (*enable_ms)(struct uart_port *);
206 void (*break_ctl)(struct uart_port *, int ctl);
207 int (*startup)(struct uart_port *);
208 void (*shutdown)(struct uart_port *);
209 void (*flush_buffer)(struct uart_port *);
210 void (*set_termios)(struct uart_port *, struct ktermios *new,
211 struct ktermios *old);
212 void (*set_ldisc)(struct uart_port *);
213 void (*pm)(struct uart_port *, unsigned int state,
214 unsigned int oldstate);
215 int (*set_wake)(struct uart_port *, unsigned int state);
218 * Return a string describing the type of the port
220 const char *(*type)(struct uart_port *);
223 * Release IO and memory resources used by the port.
224 * This includes iounmap if necessary.
226 void (*release_port)(struct uart_port *);
229 * Request IO and memory resources used by the port.
230 * This includes iomapping the port if necessary.
232 int (*request_port)(struct uart_port *);
233 void (*config_port)(struct uart_port *, int);
234 int (*verify_port)(struct uart_port *, struct serial_struct *);
235 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
236 #ifdef CONFIG_CONSOLE_POLL
237 void (*poll_put_char)(struct uart_port *, unsigned char);
238 int (*poll_get_char)(struct uart_port *);
242 #define UART_CONFIG_TYPE (1 << 0)
243 #define UART_CONFIG_IRQ (1 << 1)
259 typedef unsigned int __bitwise__ upf_t;
262 spinlock_t lock; /* port lock */
263 unsigned long iobase; /* in/out[bwl] */
264 unsigned char __iomem *membase; /* read/write[bwl] */
265 unsigned int (*serial_in)(struct uart_port *, int);
266 void (*serial_out)(struct uart_port *, int, int);
267 unsigned int irq; /* irq number */
268 unsigned int uartclk; /* base uart clock */
269 unsigned int fifosize; /* tx fifo size */
270 unsigned char x_char; /* xon/xoff char */
271 unsigned char regshift; /* reg offset shift */
272 unsigned char iotype; /* io access style */
273 unsigned char unused1;
275 #define UPIO_PORT (0)
276 #define UPIO_HUB6 (1)
278 #define UPIO_MEM32 (3)
279 #define UPIO_AU (4) /* Au1x00 type IO */
280 #define UPIO_TSI (5) /* Tsi108/109 type IO */
281 #define UPIO_DWAPB (6) /* DesignWare APB UART */
282 #define UPIO_RM9000 (7) /* RM9000 type IO */
284 unsigned int read_status_mask; /* driver specific */
285 unsigned int ignore_status_mask; /* driver specific */
286 struct uart_info *info; /* pointer to parent info */
287 struct uart_icount icount; /* statistics */
289 struct console *cons; /* struct console, if any */
290 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
291 unsigned long sysrq; /* sysrq timeout */
296 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
297 #define UPF_SAK ((__force upf_t) (1 << 2))
298 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
299 #define UPF_SPD_HI ((__force upf_t) (0x0010))
300 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
301 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
302 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
303 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
304 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
305 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
306 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
307 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
308 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
309 #define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15))
310 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
311 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
312 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
313 /* The exact UART type is known and should not be probed. */
314 #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
315 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
316 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
317 #define UPF_DEAD ((__force upf_t) (1 << 30))
318 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
320 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
321 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
323 unsigned int mctrl; /* current modem ctrl settings */
324 unsigned int timeout; /* character-based timeout */
325 unsigned int type; /* port type */
326 const struct uart_ops *ops;
327 unsigned int custom_divisor;
328 unsigned int line; /* port index */
329 resource_size_t mapbase; /* for ioremap */
330 struct device *dev; /* parent device */
331 unsigned char hub6; /* this should be in the 8250 driver */
332 unsigned char suspended;
333 unsigned char unused[2];
334 void *private_data; /* generic platform data pointer */
338 * This is the state information which is only valid when the port
339 * is open; it may be cleared the core driver once the device has
340 * been closed. Either the low level driver or the core can modify
343 typedef unsigned int __bitwise__ uif_t;
346 struct tty_port port;
347 struct circ_buf xmit;
351 * Definitions for info->flags. These are _private_ to serial_core, and
352 * are specific to this structure. They may be queried by low level drivers.
354 * FIXME: use the ASY_ definitions
356 #define UIF_CHECK_CD ((__force uif_t) (1 << 25))
357 #define UIF_CTS_FLOW ((__force uif_t) (1 << 26))
358 #define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29))
359 #define UIF_INITIALIZED ((__force uif_t) (1 << 31))
360 #define UIF_SUSPENDED ((__force uif_t) (1 << 30))
362 struct tasklet_struct tlet;
363 wait_queue_head_t delta_msr_wait;
367 * This is the state information which is persistent across opens.
368 * The low level driver must not to touch any elements contained
372 unsigned int close_delay; /* msec */
373 unsigned int closing_wait; /* msec */
375 #define USF_CLOSING_WAIT_INF (0)
376 #define USF_CLOSING_WAIT_NONE (~0U)
380 struct uart_info info;
381 struct uart_port *port;
386 #define UART_XMIT_SIZE PAGE_SIZE
389 /* number of characters left in xmit buffer before we ask for more */
390 #define WAKEUP_CHARS 256
396 struct module *owner;
397 const char *driver_name;
398 const char *dev_name;
402 struct console *cons;
405 * these are private; the low level driver should not
406 * touch these; they should be initialised to NULL
408 struct uart_state *state;
409 struct tty_driver *tty_driver;
412 void uart_write_wakeup(struct uart_port *port);
417 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
419 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
420 struct ktermios *old, unsigned int min,
422 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
427 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
429 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
431 int uart_set_options(struct uart_port *port, struct console *co, int baud,
432 int parity, int bits, int flow);
433 struct tty_driver *uart_console_device(struct console *co, int *index);
434 void uart_console_write(struct uart_port *port, const char *s,
436 void (*putchar)(struct uart_port *, int));
439 * Port/driver registration/removal
441 int uart_register_driver(struct uart_driver *uart);
442 void uart_unregister_driver(struct uart_driver *uart);
443 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
444 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
445 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
450 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
451 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
453 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
454 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
456 #define uart_circ_chars_pending(circ) \
457 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
459 #define uart_circ_chars_free(circ) \
460 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
462 static inline int uart_tx_stopped(struct uart_port *port)
464 struct tty_struct *tty = port->info->port.tty;
465 if(tty->stopped || tty->hw_stopped)
471 * The following are helper functions for the low level drivers.
474 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
478 if (ch && time_before(jiffies, port->sysrq)) {
479 handle_sysrq(ch, port->info->port.tty);
488 #ifndef SUPPORT_SYSRQ
489 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
493 * We do the SysRQ and SAK checking like this...
495 static inline int uart_handle_break(struct uart_port *port)
497 struct uart_info *info = port->info;
499 if (port->cons && port->cons->index == port->line) {
501 port->sysrq = jiffies + HZ*5;
507 if (port->flags & UPF_SAK)
508 do_SAK(info->port.tty);
513 * uart_handle_dcd_change - handle a change of carrier detect state
514 * @port: uart_port structure for the open port
515 * @status: new carrier detect status, nonzero if active
518 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
520 struct uart_info *info = port->info;
524 #ifdef CONFIG_HARD_PPS
525 if ((port->flags & UPF_HARDPPS_CD) && status)
529 if (info->flags & UIF_CHECK_CD) {
531 wake_up_interruptible(&info->port.open_wait);
532 else if (info->port.tty)
533 tty_hangup(info->port.tty);
538 * uart_handle_cts_change - handle a change of clear-to-send state
539 * @port: uart_port structure for the open port
540 * @status: new clear to send status, nonzero if active
543 uart_handle_cts_change(struct uart_port *port, unsigned int status)
545 struct uart_info *info = port->info;
546 struct tty_struct *tty = info->port.tty;
550 if (info->flags & UIF_CTS_FLOW) {
551 if (tty->hw_stopped) {
554 port->ops->start_tx(port);
555 uart_write_wakeup(port);
560 port->ops->stop_tx(port);
566 #include <linux/tty_flip.h>
569 uart_insert_char(struct uart_port *port, unsigned int status,
570 unsigned int overrun, unsigned int ch, unsigned int flag)
572 struct tty_struct *tty = port->info->port.tty;
574 if ((status & port->ignore_status_mask & ~overrun) == 0)
575 tty_insert_flip_char(tty, ch, flag);
578 * Overrun is special. Since it's reported immediately,
579 * it doesn't affect the current character.
581 if (status & ~port->ignore_status_mask & overrun)
582 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
586 * UART_ENABLE_MS - determine if port should enable modem status irqs
588 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
589 (cflag) & CRTSCTS || \
594 #endif /* LINUX_SERIAL_CORE_H */