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 */
155 #include <linux/compiler.h>
156 #include <linux/interrupt.h>
157 #include <linux/circ_buf.h>
158 #include <linux/spinlock.h>
159 #include <linux/sched.h>
160 #include <linux/tty.h>
161 #include <linux/mutex.h>
162 #include <linux/sysrq.h>
166 struct serial_struct;
170 * This structure describes all the operations that can be
171 * done on the physical hardware.
174 unsigned int (*tx_empty)(struct uart_port *);
175 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
176 unsigned int (*get_mctrl)(struct uart_port *);
177 void (*stop_tx)(struct uart_port *);
178 void (*start_tx)(struct uart_port *);
179 void (*send_xchar)(struct uart_port *, char ch);
180 void (*stop_rx)(struct uart_port *);
181 void (*enable_ms)(struct uart_port *);
182 void (*break_ctl)(struct uart_port *, int ctl);
183 int (*startup)(struct uart_port *);
184 void (*shutdown)(struct uart_port *);
185 void (*set_termios)(struct uart_port *, struct ktermios *new,
186 struct ktermios *old);
187 void (*pm)(struct uart_port *, unsigned int state,
188 unsigned int oldstate);
189 int (*set_wake)(struct uart_port *, unsigned int state);
192 * Return a string describing the type of the port
194 const char *(*type)(struct uart_port *);
197 * Release IO and memory resources used by the port.
198 * This includes iounmap if necessary.
200 void (*release_port)(struct uart_port *);
203 * Request IO and memory resources used by the port.
204 * This includes iomapping the port if necessary.
206 int (*request_port)(struct uart_port *);
207 void (*config_port)(struct uart_port *, int);
208 int (*verify_port)(struct uart_port *, struct serial_struct *);
209 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
212 #define UART_CONFIG_TYPE (1 << 0)
213 #define UART_CONFIG_IRQ (1 << 1)
229 typedef unsigned int __bitwise__ upf_t;
232 spinlock_t lock; /* port lock */
233 unsigned int iobase; /* in/out[bwl] */
234 unsigned char __iomem *membase; /* read/write[bwl] */
235 unsigned int irq; /* irq number */
236 unsigned int uartclk; /* base uart clock */
237 unsigned int fifosize; /* tx fifo size */
238 unsigned char x_char; /* xon/xoff char */
239 unsigned char regshift; /* reg offset shift */
240 unsigned char iotype; /* io access style */
241 unsigned char unused1;
243 #define UPIO_PORT (0)
244 #define UPIO_HUB6 (1)
246 #define UPIO_MEM32 (3)
247 #define UPIO_AU (4) /* Au1x00 type IO */
248 #define UPIO_TSI (5) /* Tsi108/109 type IO */
249 #define UPIO_DWAPB (6) /* DesignWare APB UART */
250 #define UPIO_RM9000 (7) /* RM9000 type IO */
252 unsigned int read_status_mask; /* driver specific */
253 unsigned int ignore_status_mask; /* driver specific */
254 struct uart_info *info; /* pointer to parent info */
255 struct uart_icount icount; /* statistics */
257 struct console *cons; /* struct console, if any */
258 #ifdef CONFIG_SERIAL_CORE_CONSOLE
259 unsigned long sysrq; /* sysrq timeout */
264 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
265 #define UPF_SAK ((__force upf_t) (1 << 2))
266 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
267 #define UPF_SPD_HI ((__force upf_t) (0x0010))
268 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
269 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
270 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
271 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
272 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
273 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
274 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
275 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
276 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
277 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
278 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
279 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
280 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
281 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
282 #define UPF_DEAD ((__force upf_t) (1 << 30))
283 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
285 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
286 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
288 unsigned int mctrl; /* current modem ctrl settings */
289 unsigned int timeout; /* character-based timeout */
290 unsigned int type; /* port type */
291 const struct uart_ops *ops;
292 unsigned int custom_divisor;
293 unsigned int line; /* port index */
294 resource_size_t mapbase; /* for ioremap */
295 struct device *dev; /* parent device */
296 unsigned char hub6; /* this should be in the 8250 driver */
297 unsigned char suspended;
298 unsigned char unused[2];
299 void *private_data; /* generic platform data pointer */
303 * This is the state information which is persistent across opens.
304 * The low level driver must not to touch any elements contained
308 unsigned int close_delay; /* msec */
309 unsigned int closing_wait; /* msec */
311 #define USF_CLOSING_WAIT_INF (0)
312 #define USF_CLOSING_WAIT_NONE (~0U)
316 struct uart_info *info;
317 struct uart_port *port;
322 #define UART_XMIT_SIZE PAGE_SIZE
324 typedef unsigned int __bitwise__ uif_t;
327 * This is the state information which is only valid when the port
328 * is open; it may be freed by the core driver once the device has
329 * been closed. Either the low level driver or the core can modify
333 struct tty_struct *tty;
334 struct circ_buf xmit;
338 * Definitions for info->flags. These are _private_ to serial_core, and
339 * are specific to this structure. They may be queried by low level drivers.
341 #define UIF_CHECK_CD ((__force uif_t) (1 << 25))
342 #define UIF_CTS_FLOW ((__force uif_t) (1 << 26))
343 #define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29))
344 #define UIF_INITIALIZED ((__force uif_t) (1 << 31))
345 #define UIF_SUSPENDED ((__force uif_t) (1 << 30))
349 struct tasklet_struct tlet;
351 wait_queue_head_t open_wait;
352 wait_queue_head_t delta_msr_wait;
355 /* number of characters left in xmit buffer before we ask for more */
356 #define WAKEUP_CHARS 256
362 struct module *owner;
363 const char *driver_name;
364 const char *dev_name;
368 struct console *cons;
371 * these are private; the low level driver should not
372 * touch these; they should be initialised to NULL
374 struct uart_state *state;
375 struct tty_driver *tty_driver;
378 void uart_write_wakeup(struct uart_port *port);
383 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
385 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
386 struct ktermios *old, unsigned int min,
388 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
393 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
395 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
397 int uart_set_options(struct uart_port *port, struct console *co, int baud,
398 int parity, int bits, int flow);
399 struct tty_driver *uart_console_device(struct console *co, int *index);
400 void uart_console_write(struct uart_port *port, const char *s,
402 void (*putchar)(struct uart_port *, int));
405 * Port/driver registration/removal
407 int uart_register_driver(struct uart_driver *uart);
408 void uart_unregister_driver(struct uart_driver *uart);
409 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
410 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
411 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
416 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
417 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
419 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
420 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
422 #define uart_circ_chars_pending(circ) \
423 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
425 #define uart_circ_chars_free(circ) \
426 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
428 #define uart_tx_stopped(port) \
429 ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
432 * The following are helper functions for the low level drivers.
435 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
439 if (ch && time_before(jiffies, port->sysrq)) {
440 handle_sysrq(ch, port->info ? port->info->tty : NULL);
449 #ifndef SUPPORT_SYSRQ
450 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
454 * We do the SysRQ and SAK checking like this...
456 static inline int uart_handle_break(struct uart_port *port)
458 struct uart_info *info = port->info;
460 if (port->cons && port->cons->index == port->line) {
462 port->sysrq = jiffies + HZ*5;
468 if (port->flags & UPF_SAK)
474 * uart_handle_dcd_change - handle a change of carrier detect state
475 * @port: uart_port structure for the open port
476 * @status: new carrier detect status, nonzero if active
479 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
481 struct uart_info *info = port->info;
485 #ifdef CONFIG_HARD_PPS
486 if ((port->flags & UPF_HARDPPS_CD) && status)
490 if (info->flags & UIF_CHECK_CD) {
492 wake_up_interruptible(&info->open_wait);
494 tty_hangup(info->tty);
499 * uart_handle_cts_change - handle a change of clear-to-send state
500 * @port: uart_port structure for the open port
501 * @status: new clear to send status, nonzero if active
504 uart_handle_cts_change(struct uart_port *port, unsigned int status)
506 struct uart_info *info = port->info;
507 struct tty_struct *tty = info->tty;
511 if (info->flags & UIF_CTS_FLOW) {
512 if (tty->hw_stopped) {
515 port->ops->start_tx(port);
516 uart_write_wakeup(port);
521 port->ops->stop_tx(port);
527 #include <linux/tty_flip.h>
530 uart_insert_char(struct uart_port *port, unsigned int status,
531 unsigned int overrun, unsigned int ch, unsigned int flag)
533 struct tty_struct *tty = port->info->tty;
535 if ((status & port->ignore_status_mask & ~overrun) == 0)
536 tty_insert_flip_char(tty, ch, flag);
539 * Overrun is special. Since it's reported immediately,
540 * it doesn't affect the current character.
542 if (status & ~port->ignore_status_mask & overrun)
543 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
547 * UART_ENABLE_MS - determine if port should enable modem status irqs
549 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
550 (cflag) & CRTSCTS || \
555 #endif /* LINUX_SERIAL_CORE_H */