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
173 #include <linux/compiler.h>
174 #include <linux/interrupt.h>
175 #include <linux/circ_buf.h>
176 #include <linux/spinlock.h>
177 #include <linux/sched.h>
178 #include <linux/tty.h>
179 #include <linux/mutex.h>
180 #include <linux/sysrq.h>
184 struct serial_struct;
188 * This structure describes all the operations that can be
189 * done on the physical hardware.
192 unsigned int (*tx_empty)(struct uart_port *);
193 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
194 unsigned int (*get_mctrl)(struct uart_port *);
195 void (*stop_tx)(struct uart_port *);
196 void (*start_tx)(struct uart_port *);
197 void (*send_xchar)(struct uart_port *, char ch);
198 void (*stop_rx)(struct uart_port *);
199 void (*enable_ms)(struct uart_port *);
200 void (*break_ctl)(struct uart_port *, int ctl);
201 int (*startup)(struct uart_port *);
202 void (*shutdown)(struct uart_port *);
203 void (*flush_buffer)(struct uart_port *);
204 void (*set_termios)(struct uart_port *, struct ktermios *new,
205 struct ktermios *old);
206 void (*set_ldisc)(struct uart_port *);
207 void (*pm)(struct uart_port *, unsigned int state,
208 unsigned int oldstate);
209 int (*set_wake)(struct uart_port *, unsigned int state);
212 * Return a string describing the type of the port
214 const char *(*type)(struct uart_port *);
217 * Release IO and memory resources used by the port.
218 * This includes iounmap if necessary.
220 void (*release_port)(struct uart_port *);
223 * Request IO and memory resources used by the port.
224 * This includes iomapping the port if necessary.
226 int (*request_port)(struct uart_port *);
227 void (*config_port)(struct uart_port *, int);
228 int (*verify_port)(struct uart_port *, struct serial_struct *);
229 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
230 #ifdef CONFIG_CONSOLE_POLL
231 void (*poll_put_char)(struct uart_port *, unsigned char);
232 int (*poll_get_char)(struct uart_port *);
236 #define UART_CONFIG_TYPE (1 << 0)
237 #define UART_CONFIG_IRQ (1 << 1)
253 typedef unsigned int __bitwise__ upf_t;
256 spinlock_t lock; /* port lock */
257 unsigned long iobase; /* in/out[bwl] */
258 unsigned char __iomem *membase; /* read/write[bwl] */
259 unsigned int (*serial_in)(struct uart_port *, int);
260 void (*serial_out)(struct uart_port *, int, int);
261 unsigned int irq; /* irq number */
262 unsigned int uartclk; /* base uart clock */
263 unsigned int fifosize; /* tx fifo size */
264 unsigned char x_char; /* xon/xoff char */
265 unsigned char regshift; /* reg offset shift */
266 unsigned char iotype; /* io access style */
267 unsigned char unused1;
269 #define UPIO_PORT (0)
270 #define UPIO_HUB6 (1)
272 #define UPIO_MEM32 (3)
273 #define UPIO_AU (4) /* Au1x00 type IO */
274 #define UPIO_TSI (5) /* Tsi108/109 type IO */
275 #define UPIO_DWAPB (6) /* DesignWare APB UART */
276 #define UPIO_RM9000 (7) /* RM9000 type IO */
278 unsigned int read_status_mask; /* driver specific */
279 unsigned int ignore_status_mask; /* driver specific */
280 struct uart_info *info; /* pointer to parent info */
281 struct uart_icount icount; /* statistics */
283 struct console *cons; /* struct console, if any */
284 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
285 unsigned long sysrq; /* sysrq timeout */
290 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
291 #define UPF_SAK ((__force upf_t) (1 << 2))
292 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
293 #define UPF_SPD_HI ((__force upf_t) (0x0010))
294 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
295 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
296 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
297 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
298 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
299 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
300 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
301 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
302 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
303 #define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15))
304 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
305 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
306 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
307 /* The exact UART type is known and should not be probed. */
308 #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
309 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
310 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
311 #define UPF_DEAD ((__force upf_t) (1 << 30))
312 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
314 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
315 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
317 unsigned int mctrl; /* current modem ctrl settings */
318 unsigned int timeout; /* character-based timeout */
319 unsigned int type; /* port type */
320 const struct uart_ops *ops;
321 unsigned int custom_divisor;
322 unsigned int line; /* port index */
323 resource_size_t mapbase; /* for ioremap */
324 struct device *dev; /* parent device */
325 unsigned char hub6; /* this should be in the 8250 driver */
326 unsigned char suspended;
327 unsigned char unused[2];
328 void *private_data; /* generic platform data pointer */
332 * This is the state information which is only valid when the port
333 * is open; it may be cleared the core driver once the device has
334 * been closed. Either the low level driver or the core can modify
337 typedef unsigned int __bitwise__ uif_t;
340 struct tty_port port;
341 struct circ_buf xmit;
345 * Definitions for info->flags. These are _private_ to serial_core, and
346 * are specific to this structure. They may be queried by low level drivers.
348 * FIXME: use the ASY_ definitions
350 #define UIF_CHECK_CD ((__force uif_t) (1 << 25))
351 #define UIF_CTS_FLOW ((__force uif_t) (1 << 26))
352 #define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29))
353 #define UIF_INITIALIZED ((__force uif_t) (1 << 31))
354 #define UIF_SUSPENDED ((__force uif_t) (1 << 30))
356 struct tasklet_struct tlet;
357 wait_queue_head_t delta_msr_wait;
361 * This is the state information which is persistent across opens.
362 * The low level driver must not to touch any elements contained
366 unsigned int close_delay; /* msec */
367 unsigned int closing_wait; /* msec */
369 #define USF_CLOSING_WAIT_INF (0)
370 #define USF_CLOSING_WAIT_NONE (~0U)
374 struct uart_info info;
375 struct uart_port *port;
380 #define UART_XMIT_SIZE PAGE_SIZE
383 /* number of characters left in xmit buffer before we ask for more */
384 #define WAKEUP_CHARS 256
390 struct module *owner;
391 const char *driver_name;
392 const char *dev_name;
396 struct console *cons;
399 * these are private; the low level driver should not
400 * touch these; they should be initialised to NULL
402 struct uart_state *state;
403 struct tty_driver *tty_driver;
406 void uart_write_wakeup(struct uart_port *port);
411 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
413 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
414 struct ktermios *old, unsigned int min,
416 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
421 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
423 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
425 int uart_set_options(struct uart_port *port, struct console *co, int baud,
426 int parity, int bits, int flow);
427 struct tty_driver *uart_console_device(struct console *co, int *index);
428 void uart_console_write(struct uart_port *port, const char *s,
430 void (*putchar)(struct uart_port *, int));
433 * Port/driver registration/removal
435 int uart_register_driver(struct uart_driver *uart);
436 void uart_unregister_driver(struct uart_driver *uart);
437 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
438 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
439 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
444 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
445 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
447 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
448 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
450 #define uart_circ_chars_pending(circ) \
451 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
453 #define uart_circ_chars_free(circ) \
454 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
456 static inline int uart_tx_stopped(struct uart_port *port)
458 struct tty_struct *tty = port->info->port.tty;
459 if(tty->stopped || tty->hw_stopped)
465 * The following are helper functions for the low level drivers.
468 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
472 if (ch && time_before(jiffies, port->sysrq)) {
473 handle_sysrq(ch, port->info->port.tty);
482 #ifndef SUPPORT_SYSRQ
483 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
487 * We do the SysRQ and SAK checking like this...
489 static inline int uart_handle_break(struct uart_port *port)
491 struct uart_info *info = port->info;
493 if (port->cons && port->cons->index == port->line) {
495 port->sysrq = jiffies + HZ*5;
501 if (port->flags & UPF_SAK)
502 do_SAK(info->port.tty);
507 * uart_handle_dcd_change - handle a change of carrier detect state
508 * @port: uart_port structure for the open port
509 * @status: new carrier detect status, nonzero if active
512 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
514 struct uart_info *info = port->info;
518 #ifdef CONFIG_HARD_PPS
519 if ((port->flags & UPF_HARDPPS_CD) && status)
523 if (info->flags & UIF_CHECK_CD) {
525 wake_up_interruptible(&info->port.open_wait);
526 else if (info->port.tty)
527 tty_hangup(info->port.tty);
532 * uart_handle_cts_change - handle a change of clear-to-send state
533 * @port: uart_port structure for the open port
534 * @status: new clear to send status, nonzero if active
537 uart_handle_cts_change(struct uart_port *port, unsigned int status)
539 struct uart_info *info = port->info;
540 struct tty_struct *tty = info->port.tty;
544 if (info->flags & UIF_CTS_FLOW) {
545 if (tty->hw_stopped) {
548 port->ops->start_tx(port);
549 uart_write_wakeup(port);
554 port->ops->stop_tx(port);
560 #include <linux/tty_flip.h>
563 uart_insert_char(struct uart_port *port, unsigned int status,
564 unsigned int overrun, unsigned int ch, unsigned int flag)
566 struct tty_struct *tty = port->info->port.tty;
568 if ((status & port->ignore_status_mask & ~overrun) == 0)
569 tty_insert_flip_char(tty, ch, flag);
572 * Overrun is special. Since it's reported immediately,
573 * it doesn't affect the current character.
575 if (status & ~port->ignore_status_mask & overrun)
576 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
580 * UART_ENABLE_MS - determine if port should enable modem status irqs
582 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
583 (cflag) & CRTSCTS || \
588 #endif /* LINUX_SERIAL_CORE_H */