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_RM9000 16 /* PMC-Sierra RM9xxx internal UART */ 43 #define PORT_OCTEON 17 /* Cavium OCTEON internal UART */ 44 #define PORT_MAX_8250 17 /* max port ID */ 45 46 /* 47 * ARM specific type numbers. These are not currently guaranteed 48 * to be implemented, and will change in the future. These are 49 * separate so any additions to the old serial.c that occur before 50 * we are merged can be easily merged here. 51 */ 52 #define PORT_PXA 31 53 #define PORT_AMBA 32 54 #define PORT_CLPS711X 33 55 #define PORT_SA1100 34 56 #define PORT_UART00 35 57 #define PORT_21285 37 58 59 /* Sparc type numbers. */ 60 #define PORT_SUNZILOG 38 61 #define PORT_SUNSAB 39 62 63 /* DEC */ 64 #define PORT_DZ 46 65 #define PORT_ZS 47 66 67 /* Parisc type numbers. */ 68 #define PORT_MUX 48 69 70 /* Atmel AT91 / AT32 SoC */ 71 #define PORT_ATMEL 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_PNX8XXX 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 /* Xilinx uartlite */ 136 #define PORT_UARTLITE 74 137 138 /* Blackfin bf5xx */ 139 #define PORT_BFIN 75 140 141 /* Micrel KS8695 */ 142 #define PORT_KS8695 76 143 144 /* Broadcom SB1250, etc. SOC */ 145 #define PORT_SB1250_DUART 77 146 147 /* Freescale ColdFire */ 148 #define PORT_MCF 78 149 150 /* Blackfin SPORT */ 151 #define PORT_BFIN_SPORT 79 152 153 /* MN10300 on-chip UART numbers */ 154 #define PORT_MN10300 80 155 #define PORT_MN10300_CTS 81 156 157 #define PORT_SC26XX 82 158 159 /* SH-SCI */ 160 #define PORT_SCIFA 83 161 162 #define PORT_S3C6400 84 163 164 /* NWPSERIAL */ 165 #define PORT_NWPSERIAL 85 166 167 /* MAX3100 */ 168 #define PORT_MAX3100 86 169 170 #ifdef __KERNEL__ 171 172 #include <linux/compiler.h> 173 #include <linux/interrupt.h> 174 #include <linux/circ_buf.h> 175 #include <linux/spinlock.h> 176 #include <linux/sched.h> 177 #include <linux/tty.h> 178 #include <linux/mutex.h> 179 #include <linux/sysrq.h> 180 181 struct uart_port; 182 struct uart_info; 183 struct serial_struct; 184 struct device; 185 186 /* 187 * This structure describes all the operations that can be 188 * done on the physical hardware. 189 */ 190 struct uart_ops { 191 unsigned int (*tx_empty)(struct uart_port *); 192 void (*set_mctrl)(struct uart_port *, unsigned int mctrl); 193 unsigned int (*get_mctrl)(struct uart_port *); 194 void (*stop_tx)(struct uart_port *); 195 void (*start_tx)(struct uart_port *); 196 void (*send_xchar)(struct uart_port *, char ch); 197 void (*stop_rx)(struct uart_port *); 198 void (*enable_ms)(struct uart_port *); 199 void (*break_ctl)(struct uart_port *, int ctl); 200 int (*startup)(struct uart_port *); 201 void (*shutdown)(struct uart_port *); 202 void (*flush_buffer)(struct uart_port *); 203 void (*set_termios)(struct uart_port *, struct ktermios *new, 204 struct ktermios *old); 205 void (*set_ldisc)(struct uart_port *); 206 void (*pm)(struct uart_port *, unsigned int state, 207 unsigned int oldstate); 208 int (*set_wake)(struct uart_port *, unsigned int state); 209 210 /* 211 * Return a string describing the type of the port 212 */ 213 const char *(*type)(struct uart_port *); 214 215 /* 216 * Release IO and memory resources used by the port. 217 * This includes iounmap if necessary. 218 */ 219 void (*release_port)(struct uart_port *); 220 221 /* 222 * Request IO and memory resources used by the port. 223 * This includes iomapping the port if necessary. 224 */ 225 int (*request_port)(struct uart_port *); 226 void (*config_port)(struct uart_port *, int); 227 int (*verify_port)(struct uart_port *, struct serial_struct *); 228 int (*ioctl)(struct uart_port *, unsigned int, unsigned long); 229 #ifdef CONFIG_CONSOLE_POLL 230 void (*poll_put_char)(struct uart_port *, unsigned char); 231 int (*poll_get_char)(struct uart_port *); 232 #endif 233 }; 234 235 #define UART_CONFIG_TYPE (1 << 0) 236 #define UART_CONFIG_IRQ (1 << 1) 237 238 struct uart_icount { 239 __u32 cts; 240 __u32 dsr; 241 __u32 rng; 242 __u32 dcd; 243 __u32 rx; 244 __u32 tx; 245 __u32 frame; 246 __u32 overrun; 247 __u32 parity; 248 __u32 brk; 249 __u32 buf_overrun; 250 }; 251 252 typedef unsigned int __bitwise__ upf_t; 253 254 struct uart_port { 255 spinlock_t lock; /* port lock */ 256 unsigned long iobase; /* in/out[bwl] */ 257 unsigned char __iomem *membase; /* read/write[bwl] */ 258 unsigned int (*serial_in)(struct uart_port *, int); 259 void (*serial_out)(struct uart_port *, int, int); 260 unsigned int irq; /* irq number */ 261 unsigned int uartclk; /* base uart clock */ 262 unsigned int fifosize; /* tx fifo size */ 263 unsigned char x_char; /* xon/xoff char */ 264 unsigned char regshift; /* reg offset shift */ 265 unsigned char iotype; /* io access style */ 266 unsigned char unused1; 267 268 #define UPIO_PORT (0) 269 #define UPIO_HUB6 (1) 270 #define UPIO_MEM (2) 271 #define UPIO_MEM32 (3) 272 #define UPIO_AU (4) /* Au1x00 type IO */ 273 #define UPIO_TSI (5) /* Tsi108/109 type IO */ 274 #define UPIO_DWAPB (6) /* DesignWare APB UART */ 275 #define UPIO_RM9000 (7) /* RM9000 type IO */ 276 277 unsigned int read_status_mask; /* driver specific */ 278 unsigned int ignore_status_mask; /* driver specific */ 279 struct uart_info *info; /* pointer to parent info */ 280 struct uart_icount icount; /* statistics */ 281 282 struct console *cons; /* struct console, if any */ 283 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ) 284 unsigned long sysrq; /* sysrq timeout */ 285 #endif 286 287 upf_t flags; 288 289 #define UPF_FOURPORT ((__force upf_t) (1 << 1)) 290 #define UPF_SAK ((__force upf_t) (1 << 2)) 291 #define UPF_SPD_MASK ((__force upf_t) (0x1030)) 292 #define UPF_SPD_HI ((__force upf_t) (0x0010)) 293 #define UPF_SPD_VHI ((__force upf_t) (0x0020)) 294 #define UPF_SPD_CUST ((__force upf_t) (0x0030)) 295 #define UPF_SPD_SHI ((__force upf_t) (0x1000)) 296 #define UPF_SPD_WARP ((__force upf_t) (0x1010)) 297 #define UPF_SKIP_TEST ((__force upf_t) (1 << 6)) 298 #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7)) 299 #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11)) 300 #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13)) 301 #define UPF_BUGGY_UART ((__force upf_t) (1 << 14)) 302 #define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15)) 303 #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16)) 304 #define UPF_CONS_FLOW ((__force upf_t) (1 << 23)) 305 #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24)) 306 /* The exact UART type is known and should not be probed. */ 307 #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27)) 308 #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28)) 309 #define UPF_FIXED_PORT ((__force upf_t) (1 << 29)) 310 #define UPF_DEAD ((__force upf_t) (1 << 30)) 311 #define UPF_IOREMAP ((__force upf_t) (1 << 31)) 312 313 #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff)) 314 #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY)) 315 316 unsigned int mctrl; /* current modem ctrl settings */ 317 unsigned int timeout; /* character-based timeout */ 318 unsigned int type; /* port type */ 319 const struct uart_ops *ops; 320 unsigned int custom_divisor; 321 unsigned int line; /* port index */ 322 resource_size_t mapbase; /* for ioremap */ 323 struct device *dev; /* parent device */ 324 unsigned char hub6; /* this should be in the 8250 driver */ 325 unsigned char suspended; 326 unsigned char unused[2]; 327 void *private_data; /* generic platform data pointer */ 328 }; 329 330 /* 331 * This is the state information which is only valid when the port 332 * is open; it may be cleared the core driver once the device has 333 * been closed. Either the low level driver or the core can modify 334 * stuff here. 335 */ 336 typedef unsigned int __bitwise__ uif_t; 337 338 struct uart_info { 339 struct tty_port port; 340 struct circ_buf xmit; 341 uif_t flags; 342 343 /* 344 * Definitions for info->flags. These are _private_ to serial_core, and 345 * are specific to this structure. They may be queried by low level drivers. 346 * 347 * FIXME: use the ASY_ definitions 348 */ 349 #define UIF_CHECK_CD ((__force uif_t) (1 << 25)) 350 #define UIF_CTS_FLOW ((__force uif_t) (1 << 26)) 351 #define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29)) 352 #define UIF_INITIALIZED ((__force uif_t) (1 << 31)) 353 #define UIF_SUSPENDED ((__force uif_t) (1 << 30)) 354 355 struct tasklet_struct tlet; 356 wait_queue_head_t delta_msr_wait; 357 }; 358 359 /* 360 * This is the state information which is persistent across opens. 361 * The low level driver must not to touch any elements contained 362 * within. 363 */ 364 struct uart_state { 365 unsigned int close_delay; /* msec */ 366 unsigned int closing_wait; /* msec */ 367 368 #define USF_CLOSING_WAIT_INF (0) 369 #define USF_CLOSING_WAIT_NONE (~0U) 370 371 int count; 372 int pm_state; 373 struct uart_info info; 374 struct uart_port *port; 375 376 struct mutex mutex; 377 }; 378 379 #define UART_XMIT_SIZE PAGE_SIZE 380 381 382 /* number of characters left in xmit buffer before we ask for more */ 383 #define WAKEUP_CHARS 256 384 385 struct module; 386 struct tty_driver; 387 388 struct uart_driver { 389 struct module *owner; 390 const char *driver_name; 391 const char *dev_name; 392 int major; 393 int minor; 394 int nr; 395 struct console *cons; 396 397 /* 398 * these are private; the low level driver should not 399 * touch these; they should be initialised to NULL 400 */ 401 struct uart_state *state; 402 struct tty_driver *tty_driver; 403 }; 404 405 void uart_write_wakeup(struct uart_port *port); 406 407 /* 408 * Baud rate helpers. 409 */ 410 void uart_update_timeout(struct uart_port *port, unsigned int cflag, 411 unsigned int baud); 412 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 413 struct ktermios *old, unsigned int min, 414 unsigned int max); 415 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud); 416 417 /* 418 * Console helpers. 419 */ 420 struct uart_port *uart_get_console(struct uart_port *ports, int nr, 421 struct console *c); 422 void uart_parse_options(char *options, int *baud, int *parity, int *bits, 423 int *flow); 424 int uart_set_options(struct uart_port *port, struct console *co, int baud, 425 int parity, int bits, int flow); 426 struct tty_driver *uart_console_device(struct console *co, int *index); 427 void uart_console_write(struct uart_port *port, const char *s, 428 unsigned int count, 429 void (*putchar)(struct uart_port *, int)); 430 431 /* 432 * Port/driver registration/removal 433 */ 434 int uart_register_driver(struct uart_driver *uart); 435 void uart_unregister_driver(struct uart_driver *uart); 436 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port); 437 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port); 438 int uart_match_port(struct uart_port *port1, struct uart_port *port2); 439 440 /* 441 * Power Management 442 */ 443 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port); 444 int uart_resume_port(struct uart_driver *reg, struct uart_port *port); 445 446 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail) 447 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0) 448 449 #define uart_circ_chars_pending(circ) \ 450 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE)) 451 452 #define uart_circ_chars_free(circ) \ 453 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE)) 454 455 static inline int uart_tx_stopped(struct uart_port *port) 456 { 457 struct tty_struct *tty = port->info->port.tty; 458 if(tty->stopped || tty->hw_stopped) 459 return 1; 460 return 0; 461 } 462 463 /* 464 * The following are helper functions for the low level drivers. 465 */ 466 static inline int 467 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch) 468 { 469 #ifdef SUPPORT_SYSRQ 470 if (port->sysrq) { 471 if (ch && time_before(jiffies, port->sysrq)) { 472 handle_sysrq(ch, port->info->port.tty); 473 port->sysrq = 0; 474 return 1; 475 } 476 port->sysrq = 0; 477 } 478 #endif 479 return 0; 480 } 481 #ifndef SUPPORT_SYSRQ 482 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0) 483 #endif 484 485 /* 486 * We do the SysRQ and SAK checking like this... 487 */ 488 static inline int uart_handle_break(struct uart_port *port) 489 { 490 struct uart_info *info = port->info; 491 #ifdef SUPPORT_SYSRQ 492 if (port->cons && port->cons->index == port->line) { 493 if (!port->sysrq) { 494 port->sysrq = jiffies + HZ*5; 495 return 1; 496 } 497 port->sysrq = 0; 498 } 499 #endif 500 if (port->flags & UPF_SAK) 501 do_SAK(info->port.tty); 502 return 0; 503 } 504 505 /** 506 * uart_handle_dcd_change - handle a change of carrier detect state 507 * @port: uart_port structure for the open port 508 * @status: new carrier detect status, nonzero if active 509 */ 510 static inline void 511 uart_handle_dcd_change(struct uart_port *port, unsigned int status) 512 { 513 struct uart_info *info = port->info; 514 515 port->icount.dcd++; 516 517 #ifdef CONFIG_HARD_PPS 518 if ((port->flags & UPF_HARDPPS_CD) && status) 519 hardpps(); 520 #endif 521 522 if (info->flags & UIF_CHECK_CD) { 523 if (status) 524 wake_up_interruptible(&info->port.open_wait); 525 else if (info->port.tty) 526 tty_hangup(info->port.tty); 527 } 528 } 529 530 /** 531 * uart_handle_cts_change - handle a change of clear-to-send state 532 * @port: uart_port structure for the open port 533 * @status: new clear to send status, nonzero if active 534 */ 535 static inline void 536 uart_handle_cts_change(struct uart_port *port, unsigned int status) 537 { 538 struct uart_info *info = port->info; 539 struct tty_struct *tty = info->port.tty; 540 541 port->icount.cts++; 542 543 if (info->flags & UIF_CTS_FLOW) { 544 if (tty->hw_stopped) { 545 if (status) { 546 tty->hw_stopped = 0; 547 port->ops->start_tx(port); 548 uart_write_wakeup(port); 549 } 550 } else { 551 if (!status) { 552 tty->hw_stopped = 1; 553 port->ops->stop_tx(port); 554 } 555 } 556 } 557 } 558 559 #include <linux/tty_flip.h> 560 561 static inline void 562 uart_insert_char(struct uart_port *port, unsigned int status, 563 unsigned int overrun, unsigned int ch, unsigned int flag) 564 { 565 struct tty_struct *tty = port->info->port.tty; 566 567 if ((status & port->ignore_status_mask & ~overrun) == 0) 568 tty_insert_flip_char(tty, ch, flag); 569 570 /* 571 * Overrun is special. Since it's reported immediately, 572 * it doesn't affect the current character. 573 */ 574 if (status & ~port->ignore_status_mask & overrun) 575 tty_insert_flip_char(tty, 0, TTY_OVERRUN); 576 } 577 578 /* 579 * UART_ENABLE_MS - determine if port should enable modem status irqs 580 */ 581 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \ 582 (cflag) & CRTSCTS || \ 583 !((cflag) & CLOCAL)) 584 585 #endif 586 587 #endif /* LINUX_SERIAL_CORE_H */ 588