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
85 #include <linux/config.h>
86 #include <linux/interrupt.h>
87 #include <linux/circ_buf.h>
88 #include <linux/spinlock.h>
89 #include <linux/sched.h>
97 * This structure describes all the operations that can be
98 * done on the physical hardware.
101 unsigned int (*tx_empty)(struct uart_port *);
102 void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
103 unsigned int (*get_mctrl)(struct uart_port *);
104 void (*stop_tx)(struct uart_port *, unsigned int tty_stop);
105 void (*start_tx)(struct uart_port *, unsigned int tty_start);
106 void (*send_xchar)(struct uart_port *, char ch);
107 void (*stop_rx)(struct uart_port *);
108 void (*enable_ms)(struct uart_port *);
109 void (*break_ctl)(struct uart_port *, int ctl);
110 int (*startup)(struct uart_port *);
111 void (*shutdown)(struct uart_port *);
112 void (*set_termios)(struct uart_port *, struct termios *new,
113 struct termios *old);
114 void (*pm)(struct uart_port *, unsigned int state,
115 unsigned int oldstate);
116 int (*set_wake)(struct uart_port *, unsigned int state);
119 * Return a string describing the type of the port
121 const char *(*type)(struct uart_port *);
124 * Release IO and memory resources used by the port.
125 * This includes iounmap if necessary.
127 void (*release_port)(struct uart_port *);
130 * Request IO and memory resources used by the port.
131 * This includes iomapping the port if necessary.
133 int (*request_port)(struct uart_port *);
134 void (*config_port)(struct uart_port *, int);
135 int (*verify_port)(struct uart_port *, struct serial_struct *);
136 int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
139 #define UART_CONFIG_TYPE (1 << 0)
140 #define UART_CONFIG_IRQ (1 << 1)
157 spinlock_t lock; /* port lock */
158 unsigned int iobase; /* in/out[bwl] */
159 char *membase; /* read/write[bwl] */
160 unsigned int irq; /* irq number */
161 unsigned int uartclk; /* base uart clock */
162 unsigned char fifosize; /* tx fifo size */
163 unsigned char x_char; /* xon/xoff char */
164 unsigned char regshift; /* reg offset shift */
165 unsigned char iotype; /* io access style */
167 #define UPIO_PORT (0)
168 #define UPIO_HUB6 (1)
171 unsigned int read_status_mask; /* driver specific */
172 unsigned int ignore_status_mask; /* driver specific */
173 struct uart_info *info; /* pointer to parent info */
174 struct uart_icount icount; /* statistics */
176 struct console *cons; /* struct console, if any */
177 #ifdef CONFIG_SERIAL_CORE_CONSOLE
178 unsigned long sysrq; /* sysrq timeout */
183 #define UPF_FOURPORT (1 << 1)
184 #define UPF_SAK (1 << 2)
185 #define UPF_SPD_MASK (0x1030)
186 #define UPF_SPD_HI (0x0010)
187 #define UPF_SPD_VHI (0x0020)
188 #define UPF_SPD_CUST (0x0030)
189 #define UPF_SPD_SHI (0x1000)
190 #define UPF_SPD_WARP (0x1010)
191 #define UPF_SKIP_TEST (1 << 6)
192 #define UPF_AUTO_IRQ (1 << 7)
193 #define UPF_HARDPPS_CD (1 << 11)
194 #define UPF_LOW_LATENCY (1 << 13)
195 #define UPF_BUGGY_UART (1 << 14)
196 #define UPF_AUTOPROBE (1 << 15)
197 #define UPF_MAGIC_MULTIPLIER (1 << 16)
198 #define UPF_BOOT_ONLYMCA (1 << 22)
199 #define UPF_CONS_FLOW (1 << 23)
200 #define UPF_SHARE_IRQ (1 << 24)
201 #define UPF_BOOT_AUTOCONF (1 << 28)
202 #define UPF_RESOURCES (1 << 30)
203 #define UPF_IOREMAP (1 << 31)
205 #define UPF_CHANGE_MASK (0x17fff)
206 #define UPF_USR_MASK (UPF_SPD_MASK|UPF_LOW_LATENCY)
208 unsigned int mctrl; /* current modem ctrl settings */
209 unsigned int timeout; /* character-based timeout */
210 unsigned int type; /* port type */
211 struct uart_ops *ops;
212 unsigned int custom_divisor;
213 unsigned int line; /* port index */
214 unsigned long mapbase; /* for ioremap */
215 struct device *dev; /* parent device */
216 unsigned char hub6; /* this should be in the 8250 driver */
217 unsigned char unused[3];
221 * This is the state information which is persistent across opens.
222 * The low level driver must not to touch any elements contained
226 unsigned int close_delay;
227 unsigned int closing_wait;
229 #define USF_CLOSING_WAIT_INF (0)
230 #define USF_CLOSING_WAIT_NONE (65535)
234 struct uart_info *info;
235 struct uart_port *port;
237 struct semaphore sem;
240 #define UART_XMIT_SIZE 1024
242 * This is the state information which is only valid when the port
243 * is open; it may be freed by the core driver once the device has
244 * been closed. Either the low level driver or the core can modify
248 struct tty_struct *tty;
249 struct circ_buf xmit;
253 * These are the flags that specific to info->flags, and reflect our
254 * internal state. They can not be accessed via port->flags. Low
255 * level drivers must not change these, but may query them instead.
257 #define UIF_CHECK_CD (1 << 25)
258 #define UIF_CTS_FLOW (1 << 26)
259 #define UIF_NORMAL_ACTIVE (1 << 29)
260 #define UIF_INITIALIZED (1 << 31)
262 unsigned char *tmpbuf;
263 struct semaphore tmpbuf_sem;
267 struct tasklet_struct tlet;
269 wait_queue_head_t open_wait;
270 wait_queue_head_t delta_msr_wait;
273 /* number of characters left in xmit buffer before we ask for more */
274 #define WAKEUP_CHARS 256
280 struct module *owner;
281 const char *driver_name;
282 const char *dev_name;
283 const char *devfs_name;
287 struct console *cons;
290 * these are private; the low level driver should not
291 * touch these; they should be initialised to NULL
293 struct uart_state *state;
294 struct tty_driver *tty_driver;
297 void uart_write_wakeup(struct uart_port *port);
302 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
304 unsigned int uart_get_baud_rate(struct uart_port *port, struct termios *termios,
305 struct termios *old, unsigned int min,
307 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
312 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
314 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
316 int uart_set_options(struct uart_port *port, struct console *co, int baud,
317 int parity, int bits, int flow);
318 struct tty_driver *uart_console_device(struct console *co, int *index);
321 * Port/driver registration/removal
323 int uart_register_driver(struct uart_driver *uart);
324 void uart_unregister_driver(struct uart_driver *uart);
325 void uart_unregister_port(struct uart_driver *reg, int line);
326 int uart_register_port(struct uart_driver *reg, struct uart_port *port);
327 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
328 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
333 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
334 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
336 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
337 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
339 #define uart_circ_chars_pending(circ) \
340 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
342 #define uart_circ_chars_free(circ) \
343 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
345 #define uart_tx_stopped(port) \
346 ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
349 * The following are helper functions for the low level drivers.
353 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
354 struct pt_regs *regs)
357 if (ch && time_before(jiffies, port->sysrq)) {
358 handle_sysrq(ch, regs, NULL);
367 #define uart_handle_sysrq_char(port,ch,regs) (0)
371 * We do the SysRQ and SAK checking like this...
373 static inline int uart_handle_break(struct uart_port *port)
375 struct uart_info *info = port->info;
377 if (port->cons && port->cons->index == port->line) {
379 port->sysrq = jiffies + HZ*5;
385 if (info->flags & UPF_SAK)
391 * uart_handle_dcd_change - handle a change of carrier detect state
392 * @port: uart_port structure for the open port
393 * @status: new carrier detect status, nonzero if active
396 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
398 struct uart_info *info = port->info;
402 #ifdef CONFIG_HARD_PPS
403 if ((port->flags & UPF_HARDPPS_CD) && status)
407 if (info->flags & UIF_CHECK_CD) {
409 wake_up_interruptible(&info->open_wait);
411 tty_hangup(info->tty);
416 * uart_handle_cts_change - handle a change of clear-to-send state
417 * @port: uart_port structure for the open port
418 * @status: new clear to send status, nonzero if active
421 uart_handle_cts_change(struct uart_port *port, unsigned int status)
423 struct uart_info *info = port->info;
424 struct tty_struct *tty = info->tty;
428 if (info->flags & UIF_CTS_FLOW) {
429 if (tty->hw_stopped) {
432 port->ops->start_tx(port, 0);
433 uart_write_wakeup(port);
438 port->ops->stop_tx(port, 0);
445 * UART_ENABLE_MS - determine if port should enable modem status irqs
447 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
448 (cflag) & CRTSCTS || \