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
22 * The type definitions. These are from Ted Ts'o's serial.h
24 #define PORT_UNKNOWN 0
31 #define PORT_16650V2 7
33 #define PORT_STARTECH 9
34 #define PORT_16C950 10
38 #define PORT_NS16550A 14
39 #define PORT_XSCALE 15
40 #define PORT_MAX_8250 15 /* max port ID */
43 * ARM specific type numbers. These are not currently guaranteed
44 * to be implemented, and will change in the future. These are
45 * separate so any additions to the old serial.c that occur before
46 * we are merged can be easily merged here.
50 #define PORT_CLPS711X 33
51 #define PORT_SA1100 34
52 #define PORT_UART00 35
55 /* Sparc type numbers. */
56 #define PORT_SUNZILOG 38
57 #define PORT_SUNSAB 39
60 #define PORT_V850E_UART 40
65 /* Parisc type numbers. */
68 /* Macintosh Zilog type numbers */
69 #define PORT_MAC_ZILOG 50 /* m68k : not yet implemented */
70 #define PORT_PMAC_ZILOG 51
77 /* Samsung S3C2410 SoC and derivatives thereof */
78 #define PORT_S3C2410 55
80 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
81 #define PORT_IP22ZILOG 56
83 /* Sharp LH7a40x -- an ARM9 SoC series */
84 #define PORT_LH7A40X 57
86 /* PPC CPM type number */
89 /* MPC52xx type numbers */
90 #define PORT_MPC52xx 59
97 #include <linux/config.h>
98 #include <linux/interrupt.h>
99 #include <linux/circ_buf.h>
100 #include <linux/spinlock.h>
101 #include <linux/sched.h>
105 struct serial_struct;
109 * This structure describes all the operations that can be
110 * done on the physical hardware.
113 unsigned int (*tx_empty)(struct uart_port *);
114 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
115 unsigned int (*get_mctrl)(struct uart_port *);
116 void (*stop_tx)(struct uart_port *, unsigned int tty_stop);
117 void (*start_tx)(struct uart_port *, unsigned int tty_start);
118 void (*send_xchar)(struct uart_port *, char ch);
119 void (*stop_rx)(struct uart_port *);
120 void (*enable_ms)(struct uart_port *);
121 void (*break_ctl)(struct uart_port *, int ctl);
122 int (*startup)(struct uart_port *);
123 void (*shutdown)(struct uart_port *);
124 void (*set_termios)(struct uart_port *, struct termios *new,
125 struct termios *old);
126 void (*pm)(struct uart_port *, unsigned int state,
127 unsigned int oldstate);
128 int (*set_wake)(struct uart_port *, unsigned int state);
131 * Return a string describing the type of the port
133 const char *(*type)(struct uart_port *);
136 * Release IO and memory resources used by the port.
137 * This includes iounmap if necessary.
139 void (*release_port)(struct uart_port *);
142 * Request IO and memory resources used by the port.
143 * This includes iomapping the port if necessary.
145 int (*request_port)(struct uart_port *);
146 void (*config_port)(struct uart_port *, int);
147 int (*verify_port)(struct uart_port *, struct serial_struct *);
148 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
151 #define UART_CONFIG_TYPE (1 << 0)
152 #define UART_CONFIG_IRQ (1 << 1)
169 spinlock_t lock; /* port lock */
170 unsigned int iobase; /* in/out[bwl] */
171 char *membase; /* read/write[bwl] */
172 unsigned int irq; /* irq number */
173 unsigned int uartclk; /* base uart clock */
174 unsigned char fifosize; /* tx fifo size */
175 unsigned char x_char; /* xon/xoff char */
176 unsigned char regshift; /* reg offset shift */
177 unsigned char iotype; /* io access style */
179 #define UPIO_PORT (0)
180 #define UPIO_HUB6 (1)
183 unsigned int read_status_mask; /* driver specific */
184 unsigned int ignore_status_mask; /* driver specific */
185 struct uart_info *info; /* pointer to parent info */
186 struct uart_icount icount; /* statistics */
188 struct console *cons; /* struct console, if any */
189 #ifdef CONFIG_SERIAL_CORE_CONSOLE
190 unsigned long sysrq; /* sysrq timeout */
195 #define UPF_FOURPORT (1 << 1)
196 #define UPF_SAK (1 << 2)
197 #define UPF_SPD_MASK (0x1030)
198 #define UPF_SPD_HI (0x0010)
199 #define UPF_SPD_VHI (0x0020)
200 #define UPF_SPD_CUST (0x0030)
201 #define UPF_SPD_SHI (0x1000)
202 #define UPF_SPD_WARP (0x1010)
203 #define UPF_SKIP_TEST (1 << 6)
204 #define UPF_AUTO_IRQ (1 << 7)
205 #define UPF_HARDPPS_CD (1 << 11)
206 #define UPF_LOW_LATENCY (1 << 13)
207 #define UPF_BUGGY_UART (1 << 14)
208 #define UPF_AUTOPROBE (1 << 15)
209 #define UPF_MAGIC_MULTIPLIER (1 << 16)
210 #define UPF_BOOT_ONLYMCA (1 << 22)
211 #define UPF_CONS_FLOW (1 << 23)
212 #define UPF_SHARE_IRQ (1 << 24)
213 #define UPF_BOOT_AUTOCONF (1 << 28)
214 #define UPF_IOREMAP (1 << 31)
216 #define UPF_CHANGE_MASK (0x17fff)
217 #define UPF_USR_MASK (UPF_SPD_MASK|UPF_LOW_LATENCY)
219 unsigned int mctrl; /* current modem ctrl settings */
220 unsigned int timeout; /* character-based timeout */
221 unsigned int type; /* port type */
222 struct uart_ops *ops;
223 unsigned int custom_divisor;
224 unsigned int line; /* port index */
225 unsigned long mapbase; /* for ioremap */
226 struct device *dev; /* parent device */
227 unsigned char hub6; /* this should be in the 8250 driver */
228 unsigned char unused[3];
232 * This is the state information which is persistent across opens.
233 * The low level driver must not to touch any elements contained
237 unsigned int close_delay;
238 unsigned int closing_wait;
240 #define USF_CLOSING_WAIT_INF (0)
241 #define USF_CLOSING_WAIT_NONE (65535)
245 struct uart_info *info;
246 struct uart_port *port;
248 struct semaphore sem;
251 #define UART_XMIT_SIZE 1024
253 * This is the state information which is only valid when the port
254 * is open; it may be freed by the core driver once the device has
255 * been closed. Either the low level driver or the core can modify
259 struct tty_struct *tty;
260 struct circ_buf xmit;
264 * These are the flags that specific to info->flags, and reflect our
265 * internal state. They can not be accessed via port->flags. Low
266 * level drivers must not change these, but may query them instead.
268 #define UIF_CHECK_CD (1 << 25)
269 #define UIF_CTS_FLOW (1 << 26)
270 #define UIF_NORMAL_ACTIVE (1 << 29)
271 #define UIF_INITIALIZED (1 << 31)
273 unsigned char *tmpbuf;
274 struct semaphore tmpbuf_sem;
278 struct tasklet_struct tlet;
280 wait_queue_head_t open_wait;
281 wait_queue_head_t delta_msr_wait;
284 /* number of characters left in xmit buffer before we ask for more */
285 #define WAKEUP_CHARS 256
291 struct module *owner;
292 const char *driver_name;
293 const char *dev_name;
294 const char *devfs_name;
298 struct console *cons;
301 * these are private; the low level driver should not
302 * touch these; they should be initialised to NULL
304 struct uart_state *state;
305 struct tty_driver *tty_driver;
308 void uart_write_wakeup(struct uart_port *port);
313 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
315 unsigned int uart_get_baud_rate(struct uart_port *port, struct termios *termios,
316 struct termios *old, unsigned int min,
318 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
323 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
325 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
327 int uart_set_options(struct uart_port *port, struct console *co, int baud,
328 int parity, int bits, int flow);
329 struct tty_driver *uart_console_device(struct console *co, int *index);
332 * Port/driver registration/removal
334 int uart_register_driver(struct uart_driver *uart);
335 void uart_unregister_driver(struct uart_driver *uart);
336 void uart_unregister_port(struct uart_driver *reg, int line);
337 int uart_register_port(struct uart_driver *reg, struct uart_port *port);
338 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
339 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
344 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
345 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
347 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
348 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
350 #define uart_circ_chars_pending(circ) \
351 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
353 #define uart_circ_chars_free(circ) \
354 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
356 #define uart_tx_stopped(port) \
357 ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
360 * The following are helper functions for the low level drivers.
364 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
365 struct pt_regs *regs)
368 if (ch && time_before(jiffies, port->sysrq)) {
369 handle_sysrq(ch, regs, NULL);
378 #define uart_handle_sysrq_char(port,ch,regs) (0)
382 * We do the SysRQ and SAK checking like this...
384 static inline int uart_handle_break(struct uart_port *port)
386 struct uart_info *info = port->info;
388 if (port->cons && port->cons->index == port->line) {
390 port->sysrq = jiffies + HZ*5;
396 if (info->flags & UPF_SAK)
402 * uart_handle_dcd_change - handle a change of carrier detect state
403 * @port: uart_port structure for the open port
404 * @status: new carrier detect status, nonzero if active
407 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
409 struct uart_info *info = port->info;
413 #ifdef CONFIG_HARD_PPS
414 if ((port->flags & UPF_HARDPPS_CD) && status)
418 if (info->flags & UIF_CHECK_CD) {
420 wake_up_interruptible(&info->open_wait);
422 tty_hangup(info->tty);
427 * uart_handle_cts_change - handle a change of clear-to-send state
428 * @port: uart_port structure for the open port
429 * @status: new clear to send status, nonzero if active
432 uart_handle_cts_change(struct uart_port *port, unsigned int status)
434 struct uart_info *info = port->info;
435 struct tty_struct *tty = info->tty;
439 if (info->flags & UIF_CTS_FLOW) {
440 if (tty->hw_stopped) {
443 port->ops->start_tx(port, 0);
444 uart_write_wakeup(port);
449 port->ops->stop_tx(port, 0);
456 * UART_ENABLE_MS - determine if port should enable modem status irqs
458 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
459 (cflag) & CRTSCTS || \