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
166 #include <linux/compiler.h>
167 #include <linux/interrupt.h>
168 #include <linux/circ_buf.h>
169 #include <linux/spinlock.h>
170 #include <linux/sched.h>
171 #include <linux/tty.h>
172 #include <linux/mutex.h>
173 #include <linux/sysrq.h>
177 struct serial_struct;
181 * This structure describes all the operations that can be
182 * done on the physical hardware.
185 unsigned int (*tx_empty)(struct uart_port *);
186 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
187 unsigned int (*get_mctrl)(struct uart_port *);
188 void (*stop_tx)(struct uart_port *);
189 void (*start_tx)(struct uart_port *);
190 void (*send_xchar)(struct uart_port *, char ch);
191 void (*stop_rx)(struct uart_port *);
192 void (*enable_ms)(struct uart_port *);
193 void (*break_ctl)(struct uart_port *, int ctl);
194 int (*startup)(struct uart_port *);
195 void (*shutdown)(struct uart_port *);
196 void (*flush_buffer)(struct uart_port *);
197 void (*set_termios)(struct uart_port *, struct ktermios *new,
198 struct ktermios *old);
199 void (*set_ldisc)(struct uart_port *);
200 void (*pm)(struct uart_port *, unsigned int state,
201 unsigned int oldstate);
202 int (*set_wake)(struct uart_port *, unsigned int state);
205 * Return a string describing the type of the port
207 const char *(*type)(struct uart_port *);
210 * Release IO and memory resources used by the port.
211 * This includes iounmap if necessary.
213 void (*release_port)(struct uart_port *);
216 * Request IO and memory resources used by the port.
217 * This includes iomapping the port if necessary.
219 int (*request_port)(struct uart_port *);
220 void (*config_port)(struct uart_port *, int);
221 int (*verify_port)(struct uart_port *, struct serial_struct *);
222 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
223 #ifdef CONFIG_CONSOLE_POLL
224 void (*poll_put_char)(struct uart_port *, unsigned char);
225 int (*poll_get_char)(struct uart_port *);
229 #define UART_CONFIG_TYPE (1 << 0)
230 #define UART_CONFIG_IRQ (1 << 1)
246 typedef unsigned int __bitwise__ upf_t;
249 spinlock_t lock; /* port lock */
250 unsigned long iobase; /* in/out[bwl] */
251 unsigned char __iomem *membase; /* read/write[bwl] */
252 unsigned int (*serial_in)(struct uart_port *, int);
253 void (*serial_out)(struct uart_port *, int, int);
254 unsigned int irq; /* irq number */
255 unsigned int uartclk; /* base uart clock */
256 unsigned int fifosize; /* tx fifo size */
257 unsigned char x_char; /* xon/xoff char */
258 unsigned char regshift; /* reg offset shift */
259 unsigned char iotype; /* io access style */
260 unsigned char unused1;
262 #define UPIO_PORT (0)
263 #define UPIO_HUB6 (1)
265 #define UPIO_MEM32 (3)
266 #define UPIO_AU (4) /* Au1x00 type IO */
267 #define UPIO_TSI (5) /* Tsi108/109 type IO */
268 #define UPIO_DWAPB (6) /* DesignWare APB UART */
269 #define UPIO_RM9000 (7) /* RM9000 type IO */
271 unsigned int read_status_mask; /* driver specific */
272 unsigned int ignore_status_mask; /* driver specific */
273 struct uart_info *info; /* pointer to parent info */
274 struct uart_icount icount; /* statistics */
276 struct console *cons; /* struct console, if any */
277 #ifdef CONFIG_SERIAL_CORE_CONSOLE
278 unsigned long sysrq; /* sysrq timeout */
283 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
284 #define UPF_SAK ((__force upf_t) (1 << 2))
285 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
286 #define UPF_SPD_HI ((__force upf_t) (0x0010))
287 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
288 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
289 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
290 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
291 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
292 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
293 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
294 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
295 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
296 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
297 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
298 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
299 /* The exact UART type is known and should not be probed. */
300 #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
301 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
302 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
303 #define UPF_DEAD ((__force upf_t) (1 << 30))
304 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
306 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
307 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
309 unsigned int mctrl; /* current modem ctrl settings */
310 unsigned int timeout; /* character-based timeout */
311 unsigned int type; /* port type */
312 const struct uart_ops *ops;
313 unsigned int custom_divisor;
314 unsigned int line; /* port index */
315 resource_size_t mapbase; /* for ioremap */
316 struct device *dev; /* parent device */
317 unsigned char hub6; /* this should be in the 8250 driver */
318 unsigned char suspended;
319 unsigned char unused[2];
320 void *private_data; /* generic platform data pointer */
324 * This is the state information which is only valid when the port
325 * is open; it may be cleared the core driver once the device has
326 * been closed. Either the low level driver or the core can modify
329 typedef unsigned int __bitwise__ uif_t;
332 struct tty_port port;
333 struct circ_buf xmit;
337 * Definitions for info->flags. These are _private_ to serial_core, and
338 * are specific to this structure. They may be queried by low level drivers.
340 * FIXME: use the ASY_ definitions
342 #define UIF_CHECK_CD ((__force uif_t) (1 << 25))
343 #define UIF_CTS_FLOW ((__force uif_t) (1 << 26))
344 #define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29))
345 #define UIF_INITIALIZED ((__force uif_t) (1 << 31))
346 #define UIF_SUSPENDED ((__force uif_t) (1 << 30))
348 struct tasklet_struct tlet;
349 wait_queue_head_t delta_msr_wait;
353 * This is the state information which is persistent across opens.
354 * The low level driver must not to touch any elements contained
358 unsigned int close_delay; /* msec */
359 unsigned int closing_wait; /* msec */
361 #define USF_CLOSING_WAIT_INF (0)
362 #define USF_CLOSING_WAIT_NONE (~0U)
366 struct uart_info info;
367 struct uart_port *port;
372 #define UART_XMIT_SIZE PAGE_SIZE
375 /* number of characters left in xmit buffer before we ask for more */
376 #define WAKEUP_CHARS 256
382 struct module *owner;
383 const char *driver_name;
384 const char *dev_name;
388 struct console *cons;
391 * these are private; the low level driver should not
392 * touch these; they should be initialised to NULL
394 struct uart_state *state;
395 struct tty_driver *tty_driver;
398 void uart_write_wakeup(struct uart_port *port);
403 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
405 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
406 struct ktermios *old, unsigned int min,
408 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
413 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
415 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
417 int uart_set_options(struct uart_port *port, struct console *co, int baud,
418 int parity, int bits, int flow);
419 struct tty_driver *uart_console_device(struct console *co, int *index);
420 void uart_console_write(struct uart_port *port, const char *s,
422 void (*putchar)(struct uart_port *, int));
425 * Port/driver registration/removal
427 int uart_register_driver(struct uart_driver *uart);
428 void uart_unregister_driver(struct uart_driver *uart);
429 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
430 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
431 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
436 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
437 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
439 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
440 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
442 #define uart_circ_chars_pending(circ) \
443 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
445 #define uart_circ_chars_free(circ) \
446 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
448 static inline int uart_tx_stopped(struct uart_port *port)
450 struct tty_struct *tty = port->info->port.tty;
451 if(tty->stopped || tty->hw_stopped)
457 * The following are helper functions for the low level drivers.
460 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
464 if (ch && time_before(jiffies, port->sysrq)) {
465 handle_sysrq(ch, port->info->port.tty);
474 #ifndef SUPPORT_SYSRQ
475 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
479 * We do the SysRQ and SAK checking like this...
481 static inline int uart_handle_break(struct uart_port *port)
483 struct uart_info *info = port->info;
485 if (port->cons && port->cons->index == port->line) {
487 port->sysrq = jiffies + HZ*5;
493 if (port->flags & UPF_SAK)
494 do_SAK(info->port.tty);
499 * uart_handle_dcd_change - handle a change of carrier detect state
500 * @port: uart_port structure for the open port
501 * @status: new carrier detect status, nonzero if active
504 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
506 struct uart_info *info = port->info;
510 #ifdef CONFIG_HARD_PPS
511 if ((port->flags & UPF_HARDPPS_CD) && status)
515 if (info->flags & UIF_CHECK_CD) {
517 wake_up_interruptible(&info->port.open_wait);
518 else if (info->port.tty)
519 tty_hangup(info->port.tty);
524 * uart_handle_cts_change - handle a change of clear-to-send state
525 * @port: uart_port structure for the open port
526 * @status: new clear to send status, nonzero if active
529 uart_handle_cts_change(struct uart_port *port, unsigned int status)
531 struct uart_info *info = port->info;
532 struct tty_struct *tty = info->port.tty;
536 if (info->flags & UIF_CTS_FLOW) {
537 if (tty->hw_stopped) {
540 port->ops->start_tx(port);
541 uart_write_wakeup(port);
546 port->ops->stop_tx(port);
552 #include <linux/tty_flip.h>
555 uart_insert_char(struct uart_port *port, unsigned int status,
556 unsigned int overrun, unsigned int ch, unsigned int flag)
558 struct tty_struct *tty = port->info->port.tty;
560 if ((status & port->ignore_status_mask & ~overrun) == 0)
561 tty_insert_flip_char(tty, ch, flag);
564 * Overrun is special. Since it's reported immediately,
565 * it doesn't affect the current character.
567 if (status & ~port->ignore_status_mask & overrun)
568 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
572 * UART_ENABLE_MS - determine if port should enable modem status irqs
574 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
575 (cflag) & CRTSCTS || \
580 #endif /* LINUX_SERIAL_CORE_H */