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 /* Macintosh Zilog type numbers */
71 #define PORT_MAC_ZILOG 50 /* m68k : not yet implemented */
72 #define PORT_PMAC_ZILOG 51
79 /* Samsung S3C2410 SoC and derivatives thereof */
80 #define PORT_S3C2410 55
82 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
83 #define PORT_IP22ZILOG 56
85 /* Sharp LH7a40x -- an ARM9 SoC series */
86 #define PORT_LH7A40X 57
88 /* PPC CPM type number */
91 /* MPC52xx type numbers */
92 #define PORT_MPC52xx 59
97 /* Samsung S3C2440 SoC */
98 #define PORT_S3C2440 61
100 /* Motorola i.MX SoC */
106 /* TXX9 type number */
109 /* NEC VR4100 series SIU/DSIU */
110 #define PORT_VR41XX_SIU 65
111 #define PORT_VR41XX_DSIU 66
113 /* Samsung S3C2400 SoC */
114 #define PORT_S3C2400 67
117 #define PORT_M32R_SIO 68
122 #define PORT_IP3106 70
126 #include <linux/config.h>
127 #include <linux/compiler.h>
128 #include <linux/interrupt.h>
129 #include <linux/circ_buf.h>
130 #include <linux/spinlock.h>
131 #include <linux/sched.h>
132 #include <linux/tty.h>
136 struct serial_struct;
140 * This structure describes all the operations that can be
141 * done on the physical hardware.
144 unsigned int (*tx_empty)(struct uart_port *);
145 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
146 unsigned int (*get_mctrl)(struct uart_port *);
147 void (*stop_tx)(struct uart_port *);
148 void (*start_tx)(struct uart_port *);
149 void (*send_xchar)(struct uart_port *, char ch);
150 void (*stop_rx)(struct uart_port *);
151 void (*enable_ms)(struct uart_port *);
152 void (*break_ctl)(struct uart_port *, int ctl);
153 int (*startup)(struct uart_port *);
154 void (*shutdown)(struct uart_port *);
155 void (*set_termios)(struct uart_port *, struct termios *new,
156 struct termios *old);
157 void (*pm)(struct uart_port *, unsigned int state,
158 unsigned int oldstate);
159 int (*set_wake)(struct uart_port *, unsigned int state);
162 * Return a string describing the type of the port
164 const char *(*type)(struct uart_port *);
167 * Release IO and memory resources used by the port.
168 * This includes iounmap if necessary.
170 void (*release_port)(struct uart_port *);
173 * Request IO and memory resources used by the port.
174 * This includes iomapping the port if necessary.
176 int (*request_port)(struct uart_port *);
177 void (*config_port)(struct uart_port *, int);
178 int (*verify_port)(struct uart_port *, struct serial_struct *);
179 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
182 #define UART_CONFIG_TYPE (1 << 0)
183 #define UART_CONFIG_IRQ (1 << 1)
200 spinlock_t lock; /* port lock */
201 unsigned int iobase; /* in/out[bwl] */
202 unsigned char __iomem *membase; /* read/write[bwl] */
203 unsigned int irq; /* irq number */
204 unsigned int uartclk; /* base uart clock */
205 unsigned char fifosize; /* tx fifo size */
206 unsigned char x_char; /* xon/xoff char */
207 unsigned char regshift; /* reg offset shift */
208 unsigned char iotype; /* io access style */
210 #define UPIO_PORT (0)
211 #define UPIO_HUB6 (1)
213 #define UPIO_MEM32 (3)
214 #define UPIO_AU (4) /* Au1x00 type IO */
216 unsigned int read_status_mask; /* driver specific */
217 unsigned int ignore_status_mask; /* driver specific */
218 struct uart_info *info; /* pointer to parent info */
219 struct uart_icount icount; /* statistics */
221 struct console *cons; /* struct console, if any */
222 #ifdef CONFIG_SERIAL_CORE_CONSOLE
223 unsigned long sysrq; /* sysrq timeout */
228 #define UPF_FOURPORT (1 << 1)
229 #define UPF_SAK (1 << 2)
230 #define UPF_SPD_MASK (0x1030)
231 #define UPF_SPD_HI (0x0010)
232 #define UPF_SPD_VHI (0x0020)
233 #define UPF_SPD_CUST (0x0030)
234 #define UPF_SPD_SHI (0x1000)
235 #define UPF_SPD_WARP (0x1010)
236 #define UPF_SKIP_TEST (1 << 6)
237 #define UPF_AUTO_IRQ (1 << 7)
238 #define UPF_HARDPPS_CD (1 << 11)
239 #define UPF_LOW_LATENCY (1 << 13)
240 #define UPF_BUGGY_UART (1 << 14)
241 #define UPF_AUTOPROBE (1 << 15)
242 #define UPF_MAGIC_MULTIPLIER (1 << 16)
243 #define UPF_BOOT_ONLYMCA (1 << 22)
244 #define UPF_CONS_FLOW (1 << 23)
245 #define UPF_SHARE_IRQ (1 << 24)
246 #define UPF_BOOT_AUTOCONF (1 << 28)
247 #define UPF_IOREMAP (1 << 31)
249 #define UPF_CHANGE_MASK (0x17fff)
250 #define UPF_USR_MASK (UPF_SPD_MASK|UPF_LOW_LATENCY)
252 unsigned int mctrl; /* current modem ctrl settings */
253 unsigned int timeout; /* character-based timeout */
254 unsigned int type; /* port type */
255 struct uart_ops *ops;
256 unsigned int custom_divisor;
257 unsigned int line; /* port index */
258 unsigned long mapbase; /* for ioremap */
259 struct device *dev; /* parent device */
260 unsigned char hub6; /* this should be in the 8250 driver */
261 unsigned char unused[3];
265 * This is the state information which is persistent across opens.
266 * The low level driver must not to touch any elements contained
270 unsigned int close_delay; /* msec */
271 unsigned int closing_wait; /* msec */
273 #define USF_CLOSING_WAIT_INF (0)
274 #define USF_CLOSING_WAIT_NONE (~0U)
278 struct uart_info *info;
279 struct uart_port *port;
281 struct semaphore sem;
284 #define UART_XMIT_SIZE PAGE_SIZE
286 * This is the state information which is only valid when the port
287 * is open; it may be freed by the core driver once the device has
288 * been closed. Either the low level driver or the core can modify
292 struct tty_struct *tty;
293 struct circ_buf xmit;
297 * These are the flags that specific to info->flags, and reflect our
298 * internal state. They can not be accessed via port->flags. Low
299 * level drivers must not change these, but may query them instead.
301 #define UIF_CHECK_CD (1 << 25)
302 #define UIF_CTS_FLOW (1 << 26)
303 #define UIF_NORMAL_ACTIVE (1 << 29)
304 #define UIF_INITIALIZED (1 << 31)
308 struct tasklet_struct tlet;
310 wait_queue_head_t open_wait;
311 wait_queue_head_t delta_msr_wait;
314 /* number of characters left in xmit buffer before we ask for more */
315 #define WAKEUP_CHARS 256
321 struct module *owner;
322 const char *driver_name;
323 const char *dev_name;
324 const char *devfs_name;
328 struct console *cons;
331 * these are private; the low level driver should not
332 * touch these; they should be initialised to NULL
334 struct uart_state *state;
335 struct tty_driver *tty_driver;
338 void uart_write_wakeup(struct uart_port *port);
343 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
345 unsigned int uart_get_baud_rate(struct uart_port *port, struct termios *termios,
346 struct termios *old, unsigned int min,
348 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
353 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
355 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
357 int uart_set_options(struct uart_port *port, struct console *co, int baud,
358 int parity, int bits, int flow);
359 struct tty_driver *uart_console_device(struct console *co, int *index);
362 * Port/driver registration/removal
364 int uart_register_driver(struct uart_driver *uart);
365 void uart_unregister_driver(struct uart_driver *uart);
366 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
367 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
368 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
373 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
374 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
376 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
377 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
379 #define uart_circ_chars_pending(circ) \
380 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
382 #define uart_circ_chars_free(circ) \
383 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
385 #define uart_tx_stopped(port) \
386 ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
389 * The following are helper functions for the low level drivers.
392 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
393 struct pt_regs *regs)
397 if (ch && time_before(jiffies, port->sysrq)) {
398 handle_sysrq(ch, regs, NULL);
407 #ifndef SUPPORT_SYSRQ
408 #define uart_handle_sysrq_char(port,ch,regs) uart_handle_sysrq_char(port, 0, NULL)
412 * We do the SysRQ and SAK checking like this...
414 static inline int uart_handle_break(struct uart_port *port)
416 struct uart_info *info = port->info;
418 if (port->cons && port->cons->index == port->line) {
420 port->sysrq = jiffies + HZ*5;
426 if (info->flags & UPF_SAK)
432 * uart_handle_dcd_change - handle a change of carrier detect state
433 * @port: uart_port structure for the open port
434 * @status: new carrier detect status, nonzero if active
437 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
439 struct uart_info *info = port->info;
443 #ifdef CONFIG_HARD_PPS
444 if ((port->flags & UPF_HARDPPS_CD) && status)
448 if (info->flags & UIF_CHECK_CD) {
450 wake_up_interruptible(&info->open_wait);
452 tty_hangup(info->tty);
457 * uart_handle_cts_change - handle a change of clear-to-send state
458 * @port: uart_port structure for the open port
459 * @status: new clear to send status, nonzero if active
462 uart_handle_cts_change(struct uart_port *port, unsigned int status)
464 struct uart_info *info = port->info;
465 struct tty_struct *tty = info->tty;
469 if (info->flags & UIF_CTS_FLOW) {
470 if (tty->hw_stopped) {
473 port->ops->start_tx(port);
474 uart_write_wakeup(port);
479 port->ops->stop_tx(port);
485 #include <linux/tty_flip.h>
488 uart_insert_char(struct uart_port *port, unsigned int status,
489 unsigned int overrun, unsigned int ch, unsigned int flag)
491 struct tty_struct *tty = port->info->tty;
493 if ((status & port->ignore_status_mask & ~overrun) == 0)
494 tty_insert_flip_char(tty, ch, flag);
497 * Overrun is special. Since it's reported immediately,
498 * it doesn't affect the current character.
500 if (status & ~port->ignore_status_mask & overrun)
501 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
505 * UART_ENABLE_MS - determine if port should enable modem status irqs
507 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
508 (cflag) & CRTSCTS || \
513 #endif /* LINUX_SERIAL_CORE_H */