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_MAX_8250 17 /* max port ID */
47 * ARM specific type numbers. These are not currently guaranteed
48 * to be implemented, and will change in the future. These are
49 * separate so any additions to the old serial.c that occur before
50 * we are merged can be easily merged here.
54 #define PORT_CLPS711X 33
55 #define PORT_SA1100 34
56 #define PORT_UART00 35
59 /* Sparc type numbers. */
60 #define PORT_SUNZILOG 38
61 #define PORT_SUNSAB 39
67 /* Parisc type numbers. */
70 /* Atmel AT91 / AT32 SoC */
73 /* Macintosh Zilog type numbers */
74 #define PORT_MAC_ZILOG 50 /* m68k : not yet implemented */
75 #define PORT_PMAC_ZILOG 51
82 /* Samsung S3C2410 SoC and derivatives thereof */
83 #define PORT_S3C2410 55
85 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
86 #define PORT_IP22ZILOG 56
88 /* Sharp LH7a40x -- an ARM9 SoC series */
89 #define PORT_LH7A40X 57
91 /* PPC CPM type number */
94 /* MPC52xx type numbers */
95 #define PORT_MPC52xx 59
100 /* Samsung S3C2440 SoC */
101 #define PORT_S3C2440 61
103 /* Motorola i.MX SoC */
109 /* TXX9 type number */
112 /* NEC VR4100 series SIU/DSIU */
113 #define PORT_VR41XX_SIU 65
114 #define PORT_VR41XX_DSIU 66
116 /* Samsung S3C2400 SoC */
117 #define PORT_S3C2400 67
120 #define PORT_M32R_SIO 68
125 #define PORT_PNX8XXX 70
130 /* SUN4V Hypervisor Console */
131 #define PORT_SUNHV 72
133 #define PORT_S3C2412 73
135 /* Xilinx uartlite */
136 #define PORT_UARTLITE 74
142 #define PORT_KS8695 76
144 /* Broadcom SB1250, etc. SOC */
145 #define PORT_SB1250_DUART 77
147 /* Freescale ColdFire */
151 #define PORT_BFIN_SPORT 79
153 /* MN10300 on-chip UART numbers */
154 #define PORT_MN10300 80
155 #define PORT_MN10300_CTS 81
157 #define PORT_SC26XX 82
160 #define PORT_SCIFA 83
162 #define PORT_S3C6400 84
165 #define PORT_NWPSERIAL 85
168 #define PORT_MAX3100 86
172 #include <linux/compiler.h>
173 #include <linux/interrupt.h>
174 #include <linux/circ_buf.h>
175 #include <linux/spinlock.h>
176 #include <linux/sched.h>
177 #include <linux/tty.h>
178 #include <linux/mutex.h>
179 #include <linux/sysrq.h>
183 struct serial_struct;
187 * This structure describes all the operations that can be
188 * done on the physical hardware.
191 unsigned int (*tx_empty)(struct uart_port *);
192 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
193 unsigned int (*get_mctrl)(struct uart_port *);
194 void (*stop_tx)(struct uart_port *);
195 void (*start_tx)(struct uart_port *);
196 void (*send_xchar)(struct uart_port *, char ch);
197 void (*stop_rx)(struct uart_port *);
198 void (*enable_ms)(struct uart_port *);
199 void (*break_ctl)(struct uart_port *, int ctl);
200 int (*startup)(struct uart_port *);
201 void (*shutdown)(struct uart_port *);
202 void (*flush_buffer)(struct uart_port *);
203 void (*set_termios)(struct uart_port *, struct ktermios *new,
204 struct ktermios *old);
205 void (*set_ldisc)(struct uart_port *);
206 void (*pm)(struct uart_port *, unsigned int state,
207 unsigned int oldstate);
208 int (*set_wake)(struct uart_port *, unsigned int state);
211 * Return a string describing the type of the port
213 const char *(*type)(struct uart_port *);
216 * Release IO and memory resources used by the port.
217 * This includes iounmap if necessary.
219 void (*release_port)(struct uart_port *);
222 * Request IO and memory resources used by the port.
223 * This includes iomapping the port if necessary.
225 int (*request_port)(struct uart_port *);
226 void (*config_port)(struct uart_port *, int);
227 int (*verify_port)(struct uart_port *, struct serial_struct *);
228 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
229 #ifdef CONFIG_CONSOLE_POLL
230 void (*poll_put_char)(struct uart_port *, unsigned char);
231 int (*poll_get_char)(struct uart_port *);
235 #define UART_CONFIG_TYPE (1 << 0)
236 #define UART_CONFIG_IRQ (1 << 1)
252 typedef unsigned int __bitwise__ upf_t;
255 spinlock_t lock; /* port lock */
256 unsigned long iobase; /* in/out[bwl] */
257 unsigned char __iomem *membase; /* read/write[bwl] */
258 unsigned int (*serial_in)(struct uart_port *, int);
259 void (*serial_out)(struct uart_port *, int, int);
260 unsigned int irq; /* irq number */
261 unsigned int uartclk; /* base uart clock */
262 unsigned int fifosize; /* tx fifo size */
263 unsigned char x_char; /* xon/xoff char */
264 unsigned char regshift; /* reg offset shift */
265 unsigned char iotype; /* io access style */
266 unsigned char unused1;
268 #define UPIO_PORT (0)
269 #define UPIO_HUB6 (1)
271 #define UPIO_MEM32 (3)
272 #define UPIO_AU (4) /* Au1x00 type IO */
273 #define UPIO_TSI (5) /* Tsi108/109 type IO */
274 #define UPIO_DWAPB (6) /* DesignWare APB UART */
275 #define UPIO_RM9000 (7) /* RM9000 type IO */
277 unsigned int read_status_mask; /* driver specific */
278 unsigned int ignore_status_mask; /* driver specific */
279 struct uart_info *info; /* pointer to parent info */
280 struct uart_icount icount; /* statistics */
282 struct console *cons; /* struct console, if any */
283 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
284 unsigned long sysrq; /* sysrq timeout */
289 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
290 #define UPF_SAK ((__force upf_t) (1 << 2))
291 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
292 #define UPF_SPD_HI ((__force upf_t) (0x0010))
293 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
294 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
295 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
296 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
297 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
298 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
299 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
300 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
301 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
302 #define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15))
303 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
304 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
305 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
306 /* The exact UART type is known and should not be probed. */
307 #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
308 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
309 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
310 #define UPF_DEAD ((__force upf_t) (1 << 30))
311 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
313 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
314 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
316 unsigned int mctrl; /* current modem ctrl settings */
317 unsigned int timeout; /* character-based timeout */
318 unsigned int type; /* port type */
319 const struct uart_ops *ops;
320 unsigned int custom_divisor;
321 unsigned int line; /* port index */
322 resource_size_t mapbase; /* for ioremap */
323 struct device *dev; /* parent device */
324 unsigned char hub6; /* this should be in the 8250 driver */
325 unsigned char suspended;
326 unsigned char unused[2];
327 void *private_data; /* generic platform data pointer */
331 * This is the state information which is only valid when the port
332 * is open; it may be cleared the core driver once the device has
333 * been closed. Either the low level driver or the core can modify
336 typedef unsigned int __bitwise__ uif_t;
339 struct tty_port port;
340 struct circ_buf xmit;
344 * Definitions for info->flags. These are _private_ to serial_core, and
345 * are specific to this structure. They may be queried by low level drivers.
347 * FIXME: use the ASY_ definitions
349 #define UIF_CHECK_CD ((__force uif_t) (1 << 25))
350 #define UIF_CTS_FLOW ((__force uif_t) (1 << 26))
351 #define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29))
352 #define UIF_INITIALIZED ((__force uif_t) (1 << 31))
353 #define UIF_SUSPENDED ((__force uif_t) (1 << 30))
355 struct tasklet_struct tlet;
356 wait_queue_head_t delta_msr_wait;
360 * This is the state information which is persistent across opens.
361 * The low level driver must not to touch any elements contained
365 unsigned int close_delay; /* msec */
366 unsigned int closing_wait; /* msec */
368 #define USF_CLOSING_WAIT_INF (0)
369 #define USF_CLOSING_WAIT_NONE (~0U)
373 struct uart_info info;
374 struct uart_port *port;
379 #define UART_XMIT_SIZE PAGE_SIZE
382 /* number of characters left in xmit buffer before we ask for more */
383 #define WAKEUP_CHARS 256
389 struct module *owner;
390 const char *driver_name;
391 const char *dev_name;
395 struct console *cons;
398 * these are private; the low level driver should not
399 * touch these; they should be initialised to NULL
401 struct uart_state *state;
402 struct tty_driver *tty_driver;
405 void uart_write_wakeup(struct uart_port *port);
410 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
412 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
413 struct ktermios *old, unsigned int min,
415 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
420 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
422 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
424 int uart_set_options(struct uart_port *port, struct console *co, int baud,
425 int parity, int bits, int flow);
426 struct tty_driver *uart_console_device(struct console *co, int *index);
427 void uart_console_write(struct uart_port *port, const char *s,
429 void (*putchar)(struct uart_port *, int));
432 * Port/driver registration/removal
434 int uart_register_driver(struct uart_driver *uart);
435 void uart_unregister_driver(struct uart_driver *uart);
436 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
437 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
438 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
443 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
444 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
446 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
447 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
449 #define uart_circ_chars_pending(circ) \
450 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
452 #define uart_circ_chars_free(circ) \
453 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
455 static inline int uart_tx_stopped(struct uart_port *port)
457 struct tty_struct *tty = port->info->port.tty;
458 if(tty->stopped || tty->hw_stopped)
464 * The following are helper functions for the low level drivers.
467 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
471 if (ch && time_before(jiffies, port->sysrq)) {
472 handle_sysrq(ch, port->info->port.tty);
481 #ifndef SUPPORT_SYSRQ
482 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
486 * We do the SysRQ and SAK checking like this...
488 static inline int uart_handle_break(struct uart_port *port)
490 struct uart_info *info = port->info;
492 if (port->cons && port->cons->index == port->line) {
494 port->sysrq = jiffies + HZ*5;
500 if (port->flags & UPF_SAK)
501 do_SAK(info->port.tty);
506 * uart_handle_dcd_change - handle a change of carrier detect state
507 * @port: uart_port structure for the open port
508 * @status: new carrier detect status, nonzero if active
511 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
513 struct uart_info *info = port->info;
517 #ifdef CONFIG_HARD_PPS
518 if ((port->flags & UPF_HARDPPS_CD) && status)
522 if (info->flags & UIF_CHECK_CD) {
524 wake_up_interruptible(&info->port.open_wait);
525 else if (info->port.tty)
526 tty_hangup(info->port.tty);
531 * uart_handle_cts_change - handle a change of clear-to-send state
532 * @port: uart_port structure for the open port
533 * @status: new clear to send status, nonzero if active
536 uart_handle_cts_change(struct uart_port *port, unsigned int status)
538 struct uart_info *info = port->info;
539 struct tty_struct *tty = info->port.tty;
543 if (info->flags & UIF_CTS_FLOW) {
544 if (tty->hw_stopped) {
547 port->ops->start_tx(port);
548 uart_write_wakeup(port);
553 port->ops->stop_tx(port);
559 #include <linux/tty_flip.h>
562 uart_insert_char(struct uart_port *port, unsigned int status,
563 unsigned int overrun, unsigned int ch, unsigned int flag)
565 struct tty_struct *tty = port->info->port.tty;
567 if ((status & port->ignore_status_mask & ~overrun) == 0)
568 tty_insert_flip_char(tty, ch, flag);
571 * Overrun is special. Since it's reported immediately,
572 * it doesn't affect the current character.
574 if (status & ~port->ignore_status_mask & overrun)
575 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
579 * UART_ENABLE_MS - determine if port should enable modem status irqs
581 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
582 (cflag) & CRTSCTS || \
587 #endif /* LINUX_SERIAL_CORE_H */