1 /* 2 * linux/drivers/char/serial_core.h 3 * 4 * Copyright (C) 2000 Deep Blue Solutions Ltd. 5 * 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. 10 * 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. 15 * 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 19 */ 20 #ifndef LINUX_SERIAL_CORE_H 21 #define LINUX_SERIAL_CORE_H 22 23 /* 24 * The type definitions. These are from Ted Ts'o's serial.h 25 */ 26 #define PORT_UNKNOWN 0 27 #define PORT_8250 1 28 #define PORT_16450 2 29 #define PORT_16550 3 30 #define PORT_16550A 4 31 #define PORT_CIRRUS 5 32 #define PORT_16650 6 33 #define PORT_16650V2 7 34 #define PORT_16750 8 35 #define PORT_STARTECH 9 36 #define PORT_16C950 10 37 #define PORT_16654 11 38 #define PORT_16850 12 39 #define PORT_RSA 13 40 #define PORT_NS16550A 14 41 #define PORT_XSCALE 15 42 #define PORT_MAX_8250 15 /* max port ID */ 43 44 /* 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. 49 */ 50 #define PORT_PXA 31 51 #define PORT_AMBA 32 52 #define PORT_CLPS711X 33 53 #define PORT_SA1100 34 54 #define PORT_UART00 35 55 #define PORT_21285 37 56 57 /* Sparc type numbers. */ 58 #define PORT_SUNZILOG 38 59 #define PORT_SUNSAB 39 60 61 /* NEC v850. */ 62 #define PORT_V850E_UART 40 63 64 /* DZ */ 65 #define PORT_DZ 47 66 67 /* Parisc type numbers. */ 68 #define PORT_MUX 48 69 70 /* Atmel AT91xxx SoC */ 71 #define PORT_AT91 49 72 73 /* Macintosh Zilog type numbers */ 74 #define PORT_MAC_ZILOG 50 /* m68k : not yet implemented */ 75 #define PORT_PMAC_ZILOG 51 76 77 /* SH-SCI */ 78 #define PORT_SCI 52 79 #define PORT_SCIF 53 80 #define PORT_IRDA 54 81 82 /* Samsung S3C2410 SoC and derivatives thereof */ 83 #define PORT_S3C2410 55 84 85 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */ 86 #define PORT_IP22ZILOG 56 87 88 /* Sharp LH7a40x -- an ARM9 SoC series */ 89 #define PORT_LH7A40X 57 90 91 /* PPC CPM type number */ 92 #define PORT_CPM 58 93 94 /* MPC52xx type numbers */ 95 #define PORT_MPC52xx 59 96 97 /* IBM icom */ 98 #define PORT_ICOM 60 99 100 /* Samsung S3C2440 SoC */ 101 #define PORT_S3C2440 61 102 103 /* Motorola i.MX SoC */ 104 #define PORT_IMX 62 105 106 /* Marvell MPSC */ 107 #define PORT_MPSC 63 108 109 /* TXX9 type number */ 110 #define PORT_TXX9 64 111 112 /* NEC VR4100 series SIU/DSIU */ 113 #define PORT_VR41XX_SIU 65 114 #define PORT_VR41XX_DSIU 66 115 116 /* Samsung S3C2400 SoC */ 117 #define PORT_S3C2400 67 118 119 /* M32R SIO */ 120 #define PORT_M32R_SIO 68 121 122 /*Digi jsm */ 123 #define PORT_JSM 69 124 125 #define PORT_IP3106 70 126 127 /* Hilscher netx */ 128 #define PORT_NETX 71 129 130 /* SUN4V Hypervisor Console */ 131 #define PORT_SUNHV 72 132 133 #define PORT_S3C2412 73 134 135 136 #ifdef __KERNEL__ 137 138 #include <linux/compiler.h> 139 #include <linux/interrupt.h> 140 #include <linux/circ_buf.h> 141 #include <linux/spinlock.h> 142 #include <linux/sched.h> 143 #include <linux/tty.h> 144 #include <linux/mutex.h> 145 146 struct uart_port; 147 struct uart_info; 148 struct serial_struct; 149 struct device; 150 151 /* 152 * This structure describes all the operations that can be 153 * done on the physical hardware. 154 */ 155 struct uart_ops { 156 unsigned int (*tx_empty)(struct uart_port *); 157 void (*set_mctrl)(struct uart_port *, unsigned int mctrl); 158 unsigned int (*get_mctrl)(struct uart_port *); 159 void (*stop_tx)(struct uart_port *); 160 void (*start_tx)(struct uart_port *); 161 void (*send_xchar)(struct uart_port *, char ch); 162 void (*stop_rx)(struct uart_port *); 163 void (*enable_ms)(struct uart_port *); 164 void (*break_ctl)(struct uart_port *, int ctl); 165 int (*startup)(struct uart_port *); 166 void (*shutdown)(struct uart_port *); 167 void (*set_termios)(struct uart_port *, struct termios *new, 168 struct termios *old); 169 void (*pm)(struct uart_port *, unsigned int state, 170 unsigned int oldstate); 171 int (*set_wake)(struct uart_port *, unsigned int state); 172 173 /* 174 * Return a string describing the type of the port 175 */ 176 const char *(*type)(struct uart_port *); 177 178 /* 179 * Release IO and memory resources used by the port. 180 * This includes iounmap if necessary. 181 */ 182 void (*release_port)(struct uart_port *); 183 184 /* 185 * Request IO and memory resources used by the port. 186 * This includes iomapping the port if necessary. 187 */ 188 int (*request_port)(struct uart_port *); 189 void (*config_port)(struct uart_port *, int); 190 int (*verify_port)(struct uart_port *, struct serial_struct *); 191 int (*ioctl)(struct uart_port *, unsigned int, unsigned long); 192 }; 193 194 #define UART_CONFIG_TYPE (1 << 0) 195 #define UART_CONFIG_IRQ (1 << 1) 196 197 struct uart_icount { 198 __u32 cts; 199 __u32 dsr; 200 __u32 rng; 201 __u32 dcd; 202 __u32 rx; 203 __u32 tx; 204 __u32 frame; 205 __u32 overrun; 206 __u32 parity; 207 __u32 brk; 208 __u32 buf_overrun; 209 }; 210 211 typedef unsigned int __bitwise__ upf_t; 212 213 struct uart_port { 214 spinlock_t lock; /* port lock */ 215 unsigned int iobase; /* in/out[bwl] */ 216 unsigned char __iomem *membase; /* read/write[bwl] */ 217 unsigned int irq; /* irq number */ 218 unsigned int uartclk; /* base uart clock */ 219 unsigned int fifosize; /* tx fifo size */ 220 unsigned char x_char; /* xon/xoff char */ 221 unsigned char regshift; /* reg offset shift */ 222 unsigned char iotype; /* io access style */ 223 unsigned char unused1; 224 225 #define UPIO_PORT (0) 226 #define UPIO_HUB6 (1) 227 #define UPIO_MEM (2) 228 #define UPIO_MEM32 (3) 229 #define UPIO_AU (4) /* Au1x00 type IO */ 230 #define UPIO_TSI (5) /* Tsi108/109 type IO */ 231 232 unsigned int read_status_mask; /* driver specific */ 233 unsigned int ignore_status_mask; /* driver specific */ 234 struct uart_info *info; /* pointer to parent info */ 235 struct uart_icount icount; /* statistics */ 236 237 struct console *cons; /* struct console, if any */ 238 #ifdef CONFIG_SERIAL_CORE_CONSOLE 239 unsigned long sysrq; /* sysrq timeout */ 240 #endif 241 242 upf_t flags; 243 244 #define UPF_FOURPORT ((__force upf_t) (1 << 1)) 245 #define UPF_SAK ((__force upf_t) (1 << 2)) 246 #define UPF_SPD_MASK ((__force upf_t) (0x1030)) 247 #define UPF_SPD_HI ((__force upf_t) (0x0010)) 248 #define UPF_SPD_VHI ((__force upf_t) (0x0020)) 249 #define UPF_SPD_CUST ((__force upf_t) (0x0030)) 250 #define UPF_SPD_SHI ((__force upf_t) (0x1000)) 251 #define UPF_SPD_WARP ((__force upf_t) (0x1010)) 252 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6)) 253 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7)) 254 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11)) 255 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13)) 256 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14)) 257 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16)) 258 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23)) 259 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24)) 260 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28)) 261 #define UPF_DEAD ((__force upf_t) (1 << 30)) 262 #define UPF_IOREMAP ((__force upf_t) (1 << 31)) 263 264 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff)) 265 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY)) 266 267 unsigned int mctrl; /* current modem ctrl settings */ 268 unsigned int timeout; /* character-based timeout */ 269 unsigned int type; /* port type */ 270 const struct uart_ops *ops; 271 unsigned int custom_divisor; 272 unsigned int line; /* port index */ 273 unsigned long mapbase; /* for ioremap */ 274 struct device *dev; /* parent device */ 275 unsigned char hub6; /* this should be in the 8250 driver */ 276 unsigned char unused[3]; 277 }; 278 279 /* 280 * This is the state information which is persistent across opens. 281 * The low level driver must not to touch any elements contained 282 * within. 283 */ 284 struct uart_state { 285 unsigned int close_delay; /* msec */ 286 unsigned int closing_wait; /* msec */ 287 288 #define USF_CLOSING_WAIT_INF (0) 289 #define USF_CLOSING_WAIT_NONE (~0U) 290 291 int count; 292 int pm_state; 293 struct uart_info *info; 294 struct uart_port *port; 295 296 struct mutex mutex; 297 }; 298 299 #define UART_XMIT_SIZE PAGE_SIZE 300 301 typedef unsigned int __bitwise__ uif_t; 302 303 /* 304 * This is the state information which is only valid when the port 305 * is open; it may be freed by the core driver once the device has 306 * been closed. Either the low level driver or the core can modify 307 * stuff here. 308 */ 309 struct uart_info { 310 struct tty_struct *tty; 311 struct circ_buf xmit; 312 uif_t flags; 313 314 /* 315 * Definitions for info->flags. These are _private_ to serial_core, and 316 * are specific to this structure. They may be queried by low level drivers. 317 */ 318 #define UIF_CHECK_CD ((__force uif_t) (1 << 25)) 319 #define UIF_CTS_FLOW ((__force uif_t) (1 << 26)) 320 #define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29)) 321 #define UIF_INITIALIZED ((__force uif_t) (1 << 31)) 322 323 int blocked_open; 324 325 struct tasklet_struct tlet; 326 327 wait_queue_head_t open_wait; 328 wait_queue_head_t delta_msr_wait; 329 }; 330 331 /* number of characters left in xmit buffer before we ask for more */ 332 #define WAKEUP_CHARS 256 333 334 struct module; 335 struct tty_driver; 336 337 struct uart_driver { 338 struct module *owner; 339 const char *driver_name; 340 const char *dev_name; 341 int major; 342 int minor; 343 int nr; 344 struct console *cons; 345 346 /* 347 * these are private; the low level driver should not 348 * touch these; they should be initialised to NULL 349 */ 350 struct uart_state *state; 351 struct tty_driver *tty_driver; 352 }; 353 354 void uart_write_wakeup(struct uart_port *port); 355 356 /* 357 * Baud rate helpers. 358 */ 359 void uart_update_timeout(struct uart_port *port, unsigned int cflag, 360 unsigned int baud); 361 unsigned int uart_get_baud_rate(struct uart_port *port, struct termios *termios, 362 struct termios *old, unsigned int min, 363 unsigned int max); 364 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud); 365 366 /* 367 * Console helpers. 368 */ 369 struct uart_port *uart_get_console(struct uart_port *ports, int nr, 370 struct console *c); 371 void uart_parse_options(char *options, int *baud, int *parity, int *bits, 372 int *flow); 373 int uart_set_options(struct uart_port *port, struct console *co, int baud, 374 int parity, int bits, int flow); 375 struct tty_driver *uart_console_device(struct console *co, int *index); 376 void uart_console_write(struct uart_port *port, const char *s, 377 unsigned int count, 378 void (*putchar)(struct uart_port *, int)); 379 380 /* 381 * Port/driver registration/removal 382 */ 383 int uart_register_driver(struct uart_driver *uart); 384 void uart_unregister_driver(struct uart_driver *uart); 385 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port); 386 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port); 387 int uart_match_port(struct uart_port *port1, struct uart_port *port2); 388 389 /* 390 * Power Management 391 */ 392 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port); 393 int uart_resume_port(struct uart_driver *reg, struct uart_port *port); 394 395 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail) 396 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0) 397 398 #define uart_circ_chars_pending(circ) \ 399 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE)) 400 401 #define uart_circ_chars_free(circ) \ 402 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE)) 403 404 #define uart_tx_stopped(port) \ 405 ((port)->info->tty->stopped || (port)->info->tty->hw_stopped) 406 407 /* 408 * The following are helper functions for the low level drivers. 409 */ 410 static inline int 411 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch, 412 struct pt_regs *regs) 413 { 414 #ifdef SUPPORT_SYSRQ 415 if (port->sysrq) { 416 if (ch && time_before(jiffies, port->sysrq)) { 417 handle_sysrq(ch, regs, NULL); 418 port->sysrq = 0; 419 return 1; 420 } 421 port->sysrq = 0; 422 } 423 #endif 424 return 0; 425 } 426 #ifndef SUPPORT_SYSRQ 427 #define uart_handle_sysrq_char(port,ch,regs) uart_handle_sysrq_char(port, 0, NULL) 428 #endif 429 430 /* 431 * We do the SysRQ and SAK checking like this... 432 */ 433 static inline int uart_handle_break(struct uart_port *port) 434 { 435 struct uart_info *info = port->info; 436 #ifdef SUPPORT_SYSRQ 437 if (port->cons && port->cons->index == port->line) { 438 if (!port->sysrq) { 439 port->sysrq = jiffies + HZ*5; 440 return 1; 441 } 442 port->sysrq = 0; 443 } 444 #endif 445 if (port->flags & UPF_SAK) 446 do_SAK(info->tty); 447 return 0; 448 } 449 450 /** 451 * uart_handle_dcd_change - handle a change of carrier detect state 452 * @port: uart_port structure for the open port 453 * @status: new carrier detect status, nonzero if active 454 */ 455 static inline void 456 uart_handle_dcd_change(struct uart_port *port, unsigned int status) 457 { 458 struct uart_info *info = port->info; 459 460 port->icount.dcd++; 461 462 #ifdef CONFIG_HARD_PPS 463 if ((port->flags & UPF_HARDPPS_CD) && status) 464 hardpps(); 465 #endif 466 467 if (info->flags & UIF_CHECK_CD) { 468 if (status) 469 wake_up_interruptible(&info->open_wait); 470 else if (info->tty) 471 tty_hangup(info->tty); 472 } 473 } 474 475 /** 476 * uart_handle_cts_change - handle a change of clear-to-send state 477 * @port: uart_port structure for the open port 478 * @status: new clear to send status, nonzero if active 479 */ 480 static inline void 481 uart_handle_cts_change(struct uart_port *port, unsigned int status) 482 { 483 struct uart_info *info = port->info; 484 struct tty_struct *tty = info->tty; 485 486 port->icount.cts++; 487 488 if (info->flags & UIF_CTS_FLOW) { 489 if (tty->hw_stopped) { 490 if (status) { 491 tty->hw_stopped = 0; 492 port->ops->start_tx(port); 493 uart_write_wakeup(port); 494 } 495 } else { 496 if (!status) { 497 tty->hw_stopped = 1; 498 port->ops->stop_tx(port); 499 } 500 } 501 } 502 } 503 504 #include <linux/tty_flip.h> 505 506 static inline void 507 uart_insert_char(struct uart_port *port, unsigned int status, 508 unsigned int overrun, unsigned int ch, unsigned int flag) 509 { 510 struct tty_struct *tty = port->info->tty; 511 512 if ((status & port->ignore_status_mask & ~overrun) == 0) 513 tty_insert_flip_char(tty, ch, flag); 514 515 /* 516 * Overrun is special. Since it's reported immediately, 517 * it doesn't affect the current character. 518 */ 519 if (status & ~port->ignore_status_mask & overrun) 520 tty_insert_flip_char(tty, 0, TTY_OVERRUN); 521 } 522 523 /* 524 * UART_ENABLE_MS - determine if port should enable modem status irqs 525 */ 526 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \ 527 (cflag) & CRTSCTS || \ 528 !((cflag) & CLOCAL)) 529 530 #endif 531 532 #endif /* LINUX_SERIAL_CORE_H */ 533
