include/linux/serial_core.h

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