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_MAX_8250 16 /* max port ID */
46 * ARM specific type numbers. These are not currently guaranteed
47 * to be implemented, and will change in the future. These are
48 * separate so any additions to the old serial.c that occur before
49 * we are merged can be easily merged here.
53 #define PORT_CLPS711X 33
54 #define PORT_SA1100 34
55 #define PORT_UART00 35
58 /* Sparc type numbers. */
59 #define PORT_SUNZILOG 38
60 #define PORT_SUNSAB 39
63 #define PORT_V850E_UART 40
69 /* Parisc type numbers. */
72 /* Atmel AT91 / AT32 SoC */
75 /* Macintosh Zilog type numbers */
76 #define PORT_MAC_ZILOG 50 /* m68k : not yet implemented */
77 #define PORT_PMAC_ZILOG 51
84 /* Samsung S3C2410 SoC and derivatives thereof */
85 #define PORT_S3C2410 55
87 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
88 #define PORT_IP22ZILOG 56
90 /* Sharp LH7a40x -- an ARM9 SoC series */
91 #define PORT_LH7A40X 57
93 /* PPC CPM type number */
96 /* MPC52xx type numbers */
97 #define PORT_MPC52xx 59
102 /* Samsung S3C2440 SoC */
103 #define PORT_S3C2440 61
105 /* Motorola i.MX SoC */
111 /* TXX9 type number */
114 /* NEC VR4100 series SIU/DSIU */
115 #define PORT_VR41XX_SIU 65
116 #define PORT_VR41XX_DSIU 66
118 /* Samsung S3C2400 SoC */
119 #define PORT_S3C2400 67
122 #define PORT_M32R_SIO 68
127 #define PORT_PNX8XXX 70
132 /* SUN4V Hypervisor Console */
133 #define PORT_SUNHV 72
135 #define PORT_S3C2412 73
137 /* Xilinx uartlite */
138 #define PORT_UARTLITE 74
144 #define PORT_KS8695 76
146 /* Broadcom SB1250, etc. SOC */
147 #define PORT_SB1250_DUART 77
149 /* Freescale ColdFire */
152 #define PORT_SC26XX 79
155 /* MN10300 on-chip UART numbers */
156 #define PORT_MN10300 80
157 #define PORT_MN10300_CTS 81
161 #include <linux/compiler.h>
162 #include <linux/interrupt.h>
163 #include <linux/circ_buf.h>
164 #include <linux/spinlock.h>
165 #include <linux/sched.h>
166 #include <linux/tty.h>
167 #include <linux/mutex.h>
168 #include <linux/sysrq.h>
172 struct serial_struct;
176 * This structure describes all the operations that can be
177 * done on the physical hardware.
180 unsigned int (*tx_empty)(struct uart_port *);
181 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
182 unsigned int (*get_mctrl)(struct uart_port *);
183 void (*stop_tx)(struct uart_port *);
184 void (*start_tx)(struct uart_port *);
185 void (*send_xchar)(struct uart_port *, char ch);
186 void (*stop_rx)(struct uart_port *);
187 void (*enable_ms)(struct uart_port *);
188 void (*break_ctl)(struct uart_port *, int ctl);
189 int (*startup)(struct uart_port *);
190 void (*shutdown)(struct uart_port *);
191 void (*set_termios)(struct uart_port *, struct ktermios *new,
192 struct ktermios *old);
193 void (*pm)(struct uart_port *, unsigned int state,
194 unsigned int oldstate);
195 int (*set_wake)(struct uart_port *, unsigned int state);
198 * Return a string describing the type of the port
200 const char *(*type)(struct uart_port *);
203 * Release IO and memory resources used by the port.
204 * This includes iounmap if necessary.
206 void (*release_port)(struct uart_port *);
209 * Request IO and memory resources used by the port.
210 * This includes iomapping the port if necessary.
212 int (*request_port)(struct uart_port *);
213 void (*config_port)(struct uart_port *, int);
214 int (*verify_port)(struct uart_port *, struct serial_struct *);
215 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
216 #ifdef CONFIG_CONSOLE_POLL
217 void (*poll_put_char)(struct uart_port *, unsigned char);
218 int (*poll_get_char)(struct uart_port *);
222 #define UART_CONFIG_TYPE (1 << 0)
223 #define UART_CONFIG_IRQ (1 << 1)
239 typedef unsigned int __bitwise__ upf_t;
242 spinlock_t lock; /* port lock */
243 unsigned int iobase; /* in/out[bwl] */
244 unsigned char __iomem *membase; /* read/write[bwl] */
245 unsigned int irq; /* irq number */
246 unsigned int uartclk; /* base uart clock */
247 unsigned int fifosize; /* tx fifo size */
248 unsigned char x_char; /* xon/xoff char */
249 unsigned char regshift; /* reg offset shift */
250 unsigned char iotype; /* io access style */
251 unsigned char unused1;
253 #define UPIO_PORT (0)
254 #define UPIO_HUB6 (1)
256 #define UPIO_MEM32 (3)
257 #define UPIO_AU (4) /* Au1x00 type IO */
258 #define UPIO_TSI (5) /* Tsi108/109 type IO */
259 #define UPIO_DWAPB (6) /* DesignWare APB UART */
260 #define UPIO_RM9000 (7) /* RM9000 type IO */
262 unsigned int read_status_mask; /* driver specific */
263 unsigned int ignore_status_mask; /* driver specific */
264 struct uart_info *info; /* pointer to parent info */
265 struct uart_icount icount; /* statistics */
267 struct console *cons; /* struct console, if any */
268 #ifdef CONFIG_SERIAL_CORE_CONSOLE
269 unsigned long sysrq; /* sysrq timeout */
274 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
275 #define UPF_SAK ((__force upf_t) (1 << 2))
276 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
277 #define UPF_SPD_HI ((__force upf_t) (0x0010))
278 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
279 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
280 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
281 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
282 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
283 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
284 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
285 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
286 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
287 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
288 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
289 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
290 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
291 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
292 #define UPF_DEAD ((__force upf_t) (1 << 30))
293 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
295 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
296 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
298 unsigned int mctrl; /* current modem ctrl settings */
299 unsigned int timeout; /* character-based timeout */
300 unsigned int type; /* port type */
301 const struct uart_ops *ops;
302 unsigned int custom_divisor;
303 unsigned int line; /* port index */
304 resource_size_t mapbase; /* for ioremap */
305 struct device *dev; /* parent device */
306 unsigned char hub6; /* this should be in the 8250 driver */
307 unsigned char suspended;
308 unsigned char unused[2];
309 void *private_data; /* generic platform data pointer */
313 * This is the state information which is persistent across opens.
314 * The low level driver must not to touch any elements contained
318 unsigned int close_delay; /* msec */
319 unsigned int closing_wait; /* msec */
321 #define USF_CLOSING_WAIT_INF (0)
322 #define USF_CLOSING_WAIT_NONE (~0U)
326 struct uart_info *info;
327 struct uart_port *port;
332 #define UART_XMIT_SIZE PAGE_SIZE
334 typedef unsigned int __bitwise__ uif_t;
337 * This is the state information which is only valid when the port
338 * is open; it may be freed by the core driver once the device has
339 * been closed. Either the low level driver or the core can modify
343 struct tty_struct *tty;
344 struct circ_buf xmit;
348 * Definitions for info->flags. These are _private_ to serial_core, and
349 * are specific to this structure. They may be queried by low level drivers.
351 #define UIF_CHECK_CD ((__force uif_t) (1 << 25))
352 #define UIF_CTS_FLOW ((__force uif_t) (1 << 26))
353 #define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29))
354 #define UIF_INITIALIZED ((__force uif_t) (1 << 31))
355 #define UIF_SUSPENDED ((__force uif_t) (1 << 30))
359 struct tasklet_struct tlet;
361 wait_queue_head_t open_wait;
362 wait_queue_head_t delta_msr_wait;
365 /* number of characters left in xmit buffer before we ask for more */
366 #define WAKEUP_CHARS 256
372 struct module *owner;
373 const char *driver_name;
374 const char *dev_name;
378 struct console *cons;
381 * these are private; the low level driver should not
382 * touch these; they should be initialised to NULL
384 struct uart_state *state;
385 struct tty_driver *tty_driver;
388 void uart_write_wakeup(struct uart_port *port);
393 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
395 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
396 struct ktermios *old, unsigned int min,
398 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
403 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
405 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
407 int uart_set_options(struct uart_port *port, struct console *co, int baud,
408 int parity, int bits, int flow);
409 struct tty_driver *uart_console_device(struct console *co, int *index);
410 void uart_console_write(struct uart_port *port, const char *s,
412 void (*putchar)(struct uart_port *, int));
415 * Port/driver registration/removal
417 int uart_register_driver(struct uart_driver *uart);
418 void uart_unregister_driver(struct uart_driver *uart);
419 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
420 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
421 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
426 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
427 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
429 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
430 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
432 #define uart_circ_chars_pending(circ) \
433 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
435 #define uart_circ_chars_free(circ) \
436 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
438 #define uart_tx_stopped(port) \
439 ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
442 * The following are helper functions for the low level drivers.
445 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
449 if (ch && time_before(jiffies, port->sysrq)) {
450 handle_sysrq(ch, port->info ? port->info->tty : NULL);
459 #ifndef SUPPORT_SYSRQ
460 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
464 * We do the SysRQ and SAK checking like this...
466 static inline int uart_handle_break(struct uart_port *port)
468 struct uart_info *info = port->info;
470 if (port->cons && port->cons->index == port->line) {
472 port->sysrq = jiffies + HZ*5;
478 if (port->flags & UPF_SAK)
484 * uart_handle_dcd_change - handle a change of carrier detect state
485 * @port: uart_port structure for the open port
486 * @status: new carrier detect status, nonzero if active
489 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
491 struct uart_info *info = port->info;
495 #ifdef CONFIG_HARD_PPS
496 if ((port->flags & UPF_HARDPPS_CD) && status)
500 if (info->flags & UIF_CHECK_CD) {
502 wake_up_interruptible(&info->open_wait);
504 tty_hangup(info->tty);
509 * uart_handle_cts_change - handle a change of clear-to-send state
510 * @port: uart_port structure for the open port
511 * @status: new clear to send status, nonzero if active
514 uart_handle_cts_change(struct uart_port *port, unsigned int status)
516 struct uart_info *info = port->info;
517 struct tty_struct *tty = info->tty;
521 if (info->flags & UIF_CTS_FLOW) {
522 if (tty->hw_stopped) {
525 port->ops->start_tx(port);
526 uart_write_wakeup(port);
531 port->ops->stop_tx(port);
537 #include <linux/tty_flip.h>
540 uart_insert_char(struct uart_port *port, unsigned int status,
541 unsigned int overrun, unsigned int ch, unsigned int flag)
543 struct tty_struct *tty = port->info->tty;
545 if ((status & port->ignore_status_mask & ~overrun) == 0)
546 tty_insert_flip_char(tty, ch, flag);
549 * Overrun is special. Since it's reported immediately,
550 * it doesn't affect the current character.
552 if (status & ~port->ignore_status_mask & overrun)
553 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
557 * UART_ENABLE_MS - determine if port should enable modem status irqs
559 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
560 (cflag) & CRTSCTS || \
565 #endif /* LINUX_SERIAL_CORE_H */