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
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
148 #include <linux/compiler.h>
149 #include <linux/interrupt.h>
150 #include <linux/circ_buf.h>
151 #include <linux/spinlock.h>
152 #include <linux/sched.h>
153 #include <linux/tty.h>
154 #include <linux/mutex.h>
155 #include <linux/sysrq.h>
159 struct serial_struct;
163 * This structure describes all the operations that can be
164 * done on the physical hardware.
167 unsigned int (*tx_empty)(struct uart_port *);
168 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
169 unsigned int (*get_mctrl)(struct uart_port *);
170 void (*stop_tx)(struct uart_port *);
171 void (*start_tx)(struct uart_port *);
172 void (*send_xchar)(struct uart_port *, char ch);
173 void (*stop_rx)(struct uart_port *);
174 void (*enable_ms)(struct uart_port *);
175 void (*break_ctl)(struct uart_port *, int ctl);
176 int (*startup)(struct uart_port *);
177 void (*shutdown)(struct uart_port *);
178 void (*set_termios)(struct uart_port *, struct ktermios *new,
179 struct ktermios *old);
180 void (*pm)(struct uart_port *, unsigned int state,
181 unsigned int oldstate);
182 int (*set_wake)(struct uart_port *, unsigned int state);
185 * Return a string describing the type of the port
187 const char *(*type)(struct uart_port *);
190 * Release IO and memory resources used by the port.
191 * This includes iounmap if necessary.
193 void (*release_port)(struct uart_port *);
196 * Request IO and memory resources used by the port.
197 * This includes iomapping the port if necessary.
199 int (*request_port)(struct uart_port *);
200 void (*config_port)(struct uart_port *, int);
201 int (*verify_port)(struct uart_port *, struct serial_struct *);
202 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
205 #define UART_CONFIG_TYPE (1 << 0)
206 #define UART_CONFIG_IRQ (1 << 1)
222 typedef unsigned int __bitwise__ upf_t;
225 spinlock_t lock; /* port lock */
226 unsigned int iobase; /* in/out[bwl] */
227 unsigned char __iomem *membase; /* read/write[bwl] */
228 unsigned int irq; /* irq number */
229 unsigned int uartclk; /* base uart clock */
230 unsigned int fifosize; /* tx fifo size */
231 unsigned char x_char; /* xon/xoff char */
232 unsigned char regshift; /* reg offset shift */
233 unsigned char iotype; /* io access style */
234 unsigned char unused1;
236 #define UPIO_PORT (0)
237 #define UPIO_HUB6 (1)
239 #define UPIO_MEM32 (3)
240 #define UPIO_AU (4) /* Au1x00 type IO */
241 #define UPIO_TSI (5) /* Tsi108/109 type IO */
242 #define UPIO_DWAPB (6) /* DesignWare APB UART */
243 #define UPIO_RM9000 (7) /* RM9000 type IO */
245 unsigned int read_status_mask; /* driver specific */
246 unsigned int ignore_status_mask; /* driver specific */
247 struct uart_info *info; /* pointer to parent info */
248 struct uart_icount icount; /* statistics */
250 struct console *cons; /* struct console, if any */
251 #ifdef CONFIG_SERIAL_CORE_CONSOLE
252 unsigned long sysrq; /* sysrq timeout */
257 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
258 #define UPF_SAK ((__force upf_t) (1 << 2))
259 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
260 #define UPF_SPD_HI ((__force upf_t) (0x0010))
261 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
262 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
263 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
264 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
265 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
266 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
267 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
268 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
269 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
270 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
271 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
272 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
273 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
274 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
275 #define UPF_DEAD ((__force upf_t) (1 << 30))
276 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
278 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
279 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
281 unsigned int mctrl; /* current modem ctrl settings */
282 unsigned int timeout; /* character-based timeout */
283 unsigned int type; /* port type */
284 const struct uart_ops *ops;
285 unsigned int custom_divisor;
286 unsigned int line; /* port index */
287 unsigned long mapbase; /* for ioremap */
288 struct device *dev; /* parent device */
289 unsigned char hub6; /* this should be in the 8250 driver */
290 unsigned char unused[3];
291 void *private_data; /* generic platform data pointer */
295 * This is the state information which is persistent across opens.
296 * The low level driver must not to touch any elements contained
300 unsigned int close_delay; /* msec */
301 unsigned int closing_wait; /* msec */
303 #define USF_CLOSING_WAIT_INF (0)
304 #define USF_CLOSING_WAIT_NONE (~0U)
308 struct uart_info *info;
309 struct uart_port *port;
314 #define UART_XMIT_SIZE PAGE_SIZE
316 typedef unsigned int __bitwise__ uif_t;
319 * This is the state information which is only valid when the port
320 * is open; it may be freed by the core driver once the device has
321 * been closed. Either the low level driver or the core can modify
325 struct tty_struct *tty;
326 struct circ_buf xmit;
330 * Definitions for info->flags. These are _private_ to serial_core, and
331 * are specific to this structure. They may be queried by low level drivers.
333 #define UIF_CHECK_CD ((__force uif_t) (1 << 25))
334 #define UIF_CTS_FLOW ((__force uif_t) (1 << 26))
335 #define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29))
336 #define UIF_INITIALIZED ((__force uif_t) (1 << 31))
337 #define UIF_SUSPENDED ((__force uif_t) (1 << 30))
341 struct tasklet_struct tlet;
343 wait_queue_head_t open_wait;
344 wait_queue_head_t delta_msr_wait;
347 /* number of characters left in xmit buffer before we ask for more */
348 #define WAKEUP_CHARS 256
354 struct module *owner;
355 const char *driver_name;
356 const char *dev_name;
360 struct console *cons;
363 * these are private; the low level driver should not
364 * touch these; they should be initialised to NULL
366 struct uart_state *state;
367 struct tty_driver *tty_driver;
370 void uart_write_wakeup(struct uart_port *port);
375 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
377 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
378 struct ktermios *old, unsigned int min,
380 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
385 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
387 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
389 int uart_set_options(struct uart_port *port, struct console *co, int baud,
390 int parity, int bits, int flow);
391 struct tty_driver *uart_console_device(struct console *co, int *index);
392 void uart_console_write(struct uart_port *port, const char *s,
394 void (*putchar)(struct uart_port *, int));
397 * Port/driver registration/removal
399 int uart_register_driver(struct uart_driver *uart);
400 void uart_unregister_driver(struct uart_driver *uart);
401 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
402 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
403 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
408 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
409 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
411 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
412 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
414 #define uart_circ_chars_pending(circ) \
415 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
417 #define uart_circ_chars_free(circ) \
418 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
420 #define uart_tx_stopped(port) \
421 ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
424 * The following are helper functions for the low level drivers.
427 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
431 if (ch && time_before(jiffies, port->sysrq)) {
432 handle_sysrq(ch, port->info->tty);
441 #ifndef SUPPORT_SYSRQ
442 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
446 * We do the SysRQ and SAK checking like this...
448 static inline int uart_handle_break(struct uart_port *port)
450 struct uart_info *info = port->info;
452 if (port->cons && port->cons->index == port->line) {
454 port->sysrq = jiffies + HZ*5;
460 if (port->flags & UPF_SAK)
466 * uart_handle_dcd_change - handle a change of carrier detect state
467 * @port: uart_port structure for the open port
468 * @status: new carrier detect status, nonzero if active
471 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
473 struct uart_info *info = port->info;
477 #ifdef CONFIG_HARD_PPS
478 if ((port->flags & UPF_HARDPPS_CD) && status)
482 if (info->flags & UIF_CHECK_CD) {
484 wake_up_interruptible(&info->open_wait);
486 tty_hangup(info->tty);
491 * uart_handle_cts_change - handle a change of clear-to-send state
492 * @port: uart_port structure for the open port
493 * @status: new clear to send status, nonzero if active
496 uart_handle_cts_change(struct uart_port *port, unsigned int status)
498 struct uart_info *info = port->info;
499 struct tty_struct *tty = info->tty;
503 if (info->flags & UIF_CTS_FLOW) {
504 if (tty->hw_stopped) {
507 port->ops->start_tx(port);
508 uart_write_wakeup(port);
513 port->ops->stop_tx(port);
519 #include <linux/tty_flip.h>
522 uart_insert_char(struct uart_port *port, unsigned int status,
523 unsigned int overrun, unsigned int ch, unsigned int flag)
525 struct tty_struct *tty = port->info->tty;
527 if ((status & port->ignore_status_mask & ~overrun) == 0)
528 tty_insert_flip_char(tty, ch, flag);
531 * Overrun is special. Since it's reported immediately,
532 * it doesn't affect the current character.
534 if (status & ~port->ignore_status_mask & overrun)
535 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
539 * UART_ENABLE_MS - determine if port should enable modem status irqs
541 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
542 (cflag) & CRTSCTS || \
547 #endif /* LINUX_SERIAL_CORE_H */