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_MAX_8250 15 /* max port ID */
45 * ARM specific type numbers. These are not currently guaranteed
46 * to be implemented, and will change in the future. These are
47 * separate so any additions to the old serial.c that occur before
48 * we are merged can be easily merged here.
52 #define PORT_CLPS711X 33
53 #define PORT_SA1100 34
54 #define PORT_UART00 35
57 /* Sparc type numbers. */
58 #define PORT_SUNZILOG 38
59 #define PORT_SUNSAB 39
62 #define PORT_V850E_UART 40
67 /* Parisc type numbers. */
70 /* Atmel AT91RM9200 SoC */
71 #define PORT_AT91RM9200 49
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_IP3106 70
130 /* SUN4V Hypervisor Console */
131 #define PORT_SUNHV 72
135 #include <linux/config.h>
136 #include <linux/compiler.h>
137 #include <linux/interrupt.h>
138 #include <linux/circ_buf.h>
139 #include <linux/spinlock.h>
140 #include <linux/sched.h>
141 #include <linux/tty.h>
142 #include <linux/mutex.h>
146 struct serial_struct;
150 * This structure describes all the operations that can be
151 * done on the physical hardware.
154 unsigned int (*tx_empty)(struct uart_port *);
155 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
156 unsigned int (*get_mctrl)(struct uart_port *);
157 void (*stop_tx)(struct uart_port *);
158 void (*start_tx)(struct uart_port *);
159 void (*send_xchar)(struct uart_port *, char ch);
160 void (*stop_rx)(struct uart_port *);
161 void (*enable_ms)(struct uart_port *);
162 void (*break_ctl)(struct uart_port *, int ctl);
163 int (*startup)(struct uart_port *);
164 void (*shutdown)(struct uart_port *);
165 void (*set_termios)(struct uart_port *, struct termios *new,
166 struct termios *old);
167 void (*pm)(struct uart_port *, unsigned int state,
168 unsigned int oldstate);
169 int (*set_wake)(struct uart_port *, unsigned int state);
172 * Return a string describing the type of the port
174 const char *(*type)(struct uart_port *);
177 * Release IO and memory resources used by the port.
178 * This includes iounmap if necessary.
180 void (*release_port)(struct uart_port *);
183 * Request IO and memory resources used by the port.
184 * This includes iomapping the port if necessary.
186 int (*request_port)(struct uart_port *);
187 void (*config_port)(struct uart_port *, int);
188 int (*verify_port)(struct uart_port *, struct serial_struct *);
189 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
192 #define UART_CONFIG_TYPE (1 << 0)
193 #define UART_CONFIG_IRQ (1 << 1)
209 typedef unsigned int __bitwise__ upf_t;
212 spinlock_t lock; /* port lock */
213 unsigned int iobase; /* in/out[bwl] */
214 unsigned char __iomem *membase; /* read/write[bwl] */
215 unsigned int irq; /* irq number */
216 unsigned int uartclk; /* base uart clock */
217 unsigned char fifosize; /* tx fifo size */
218 unsigned char x_char; /* xon/xoff char */
219 unsigned char regshift; /* reg offset shift */
220 unsigned char iotype; /* io access style */
222 #define UPIO_PORT (0)
223 #define UPIO_HUB6 (1)
225 #define UPIO_MEM32 (3)
226 #define UPIO_AU (4) /* Au1x00 type IO */
228 unsigned int read_status_mask; /* driver specific */
229 unsigned int ignore_status_mask; /* driver specific */
230 struct uart_info *info; /* pointer to parent info */
231 struct uart_icount icount; /* statistics */
233 struct console *cons; /* struct console, if any */
234 #ifdef CONFIG_SERIAL_CORE_CONSOLE
235 unsigned long sysrq; /* sysrq timeout */
240 #define UPF_FOURPORT ((__force upf_t) (1 << 1))
241 #define UPF_SAK ((__force upf_t) (1 << 2))
242 #define UPF_SPD_MASK ((__force upf_t) (0x1030))
243 #define UPF_SPD_HI ((__force upf_t) (0x0010))
244 #define UPF_SPD_VHI ((__force upf_t) (0x0020))
245 #define UPF_SPD_CUST ((__force upf_t) (0x0030))
246 #define UPF_SPD_SHI ((__force upf_t) (0x1000))
247 #define UPF_SPD_WARP ((__force upf_t) (0x1010))
248 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
249 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
250 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
251 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
252 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
253 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
254 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
255 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
256 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
257 #define UPF_IOREMAP ((__force upf_t) (1 << 31))
259 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
260 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
262 unsigned int mctrl; /* current modem ctrl settings */
263 unsigned int timeout; /* character-based timeout */
264 unsigned int type; /* port type */
265 const struct uart_ops *ops;
266 unsigned int custom_divisor;
267 unsigned int line; /* port index */
268 unsigned long mapbase; /* for ioremap */
269 struct device *dev; /* parent device */
270 unsigned char hub6; /* this should be in the 8250 driver */
271 unsigned char unused[3];
275 * This is the state information which is persistent across opens.
276 * The low level driver must not to touch any elements contained
280 unsigned int close_delay; /* msec */
281 unsigned int closing_wait; /* msec */
283 #define USF_CLOSING_WAIT_INF (0)
284 #define USF_CLOSING_WAIT_NONE (~0U)
288 struct uart_info *info;
289 struct uart_port *port;
294 #define UART_XMIT_SIZE PAGE_SIZE
296 typedef unsigned int __bitwise__ uif_t;
299 * This is the state information which is only valid when the port
300 * is open; it may be freed by the core driver once the device has
301 * been closed. Either the low level driver or the core can modify
305 struct tty_struct *tty;
306 struct circ_buf xmit;
310 * Definitions for info->flags. These are _private_ to serial_core, and
311 * are specific to this structure. They may be queried by low level drivers.
313 #define UIF_CHECK_CD ((__force uif_t) (1 << 25))
314 #define UIF_CTS_FLOW ((__force uif_t) (1 << 26))
315 #define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29))
316 #define UIF_INITIALIZED ((__force uif_t) (1 << 31))
320 struct tasklet_struct tlet;
322 wait_queue_head_t open_wait;
323 wait_queue_head_t delta_msr_wait;
326 /* number of characters left in xmit buffer before we ask for more */
327 #define WAKEUP_CHARS 256
333 struct module *owner;
334 const char *driver_name;
335 const char *dev_name;
336 const char *devfs_name;
340 struct console *cons;
343 * these are private; the low level driver should not
344 * touch these; they should be initialised to NULL
346 struct uart_state *state;
347 struct tty_driver *tty_driver;
350 void uart_write_wakeup(struct uart_port *port);
355 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
357 unsigned int uart_get_baud_rate(struct uart_port *port, struct termios *termios,
358 struct termios *old, unsigned int min,
360 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
365 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
367 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
369 int uart_set_options(struct uart_port *port, struct console *co, int baud,
370 int parity, int bits, int flow);
371 struct tty_driver *uart_console_device(struct console *co, int *index);
374 * Port/driver registration/removal
376 int uart_register_driver(struct uart_driver *uart);
377 void uart_unregister_driver(struct uart_driver *uart);
378 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
379 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
380 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
385 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
386 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
388 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
389 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
391 #define uart_circ_chars_pending(circ) \
392 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
394 #define uart_circ_chars_free(circ) \
395 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
397 #define uart_tx_stopped(port) \
398 ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
401 * The following are helper functions for the low level drivers.
404 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
405 struct pt_regs *regs)
409 if (ch && time_before(jiffies, port->sysrq)) {
410 handle_sysrq(ch, regs, NULL);
419 #ifndef SUPPORT_SYSRQ
420 #define uart_handle_sysrq_char(port,ch,regs) uart_handle_sysrq_char(port, 0, NULL)
424 * We do the SysRQ and SAK checking like this...
426 static inline int uart_handle_break(struct uart_port *port)
428 struct uart_info *info = port->info;
430 if (port->cons && port->cons->index == port->line) {
432 port->sysrq = jiffies + HZ*5;
438 if (port->flags & UPF_SAK)
444 * uart_handle_dcd_change - handle a change of carrier detect state
445 * @port: uart_port structure for the open port
446 * @status: new carrier detect status, nonzero if active
449 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
451 struct uart_info *info = port->info;
455 #ifdef CONFIG_HARD_PPS
456 if ((port->flags & UPF_HARDPPS_CD) && status)
460 if (info->flags & UIF_CHECK_CD) {
462 wake_up_interruptible(&info->open_wait);
464 tty_hangup(info->tty);
469 * uart_handle_cts_change - handle a change of clear-to-send state
470 * @port: uart_port structure for the open port
471 * @status: new clear to send status, nonzero if active
474 uart_handle_cts_change(struct uart_port *port, unsigned int status)
476 struct uart_info *info = port->info;
477 struct tty_struct *tty = info->tty;
481 if (info->flags & UIF_CTS_FLOW) {
482 if (tty->hw_stopped) {
485 port->ops->start_tx(port);
486 uart_write_wakeup(port);
491 port->ops->stop_tx(port);
497 #include <linux/tty_flip.h>
500 uart_insert_char(struct uart_port *port, unsigned int status,
501 unsigned int overrun, unsigned int ch, unsigned int flag)
503 struct tty_struct *tty = port->info->tty;
505 if ((status & port->ignore_status_mask & ~overrun) == 0)
506 tty_insert_flip_char(tty, ch, flag);
509 * Overrun is special. Since it's reported immediately,
510 * it doesn't affect the current character.
512 if (status & ~port->ignore_status_mask & overrun)
513 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
517 * UART_ENABLE_MS - determine if port should enable modem status irqs
519 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
520 (cflag) & CRTSCTS || \
525 #endif /* LINUX_SERIAL_CORE_H */