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_MAX_8250   16      /* max port ID */
  44
  45 /*
  46  * ARM specific type numbers.  These are not currently guaranteed
  47  * to be implemented, and will change in the future.  These are
  48  * separate so any additions to the old serial.c that occur before
  49  * we are merged can be easily merged here.
  50  */
  51 #define PORT_PXA        31
  52 #define PORT_AMBA       32
  53 #define PORT_CLPS711X   33
  54 #define PORT_SA1100     34
  55 #define PORT_UART00     35
  56 #define PORT_21285      37
  57
  58 /* Sparc type numbers.  */
  59 #define PORT_SUNZILOG   38
  60 #define PORT_SUNSAB     39
  61
  62 /* NEC v850.  */
  63 #define PORT_V850E_UART 40
  64
  65 /* DZ */
  66 #define PORT_DZ         47
  67
  68 /* Parisc type numbers. */
  69 #define PORT_MUX        48
  70
  71 /* Atmel AT91 / AT32 SoC */
  72 #define PORT_ATMEL      49
  73
  74 /* Macintosh Zilog type numbers */
  75 #define PORT_MAC_ZILOG  50      /* m68k : not yet implemented */
  76 #define PORT_PMAC_ZILOG 51
  77
  78 /* SH-SCI */
  79 #define PORT_SCI        52
  80 #define PORT_SCIF       53
  81 #define PORT_IRDA       54
  82
  83 /* Samsung S3C2410 SoC and derivatives thereof */
  84 #define PORT_S3C2410    55
  85
  86 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
  87 #define PORT_IP22ZILOG  56
  88
  89 /* Sharp LH7a40x -- an ARM9 SoC series */
  90 #define PORT_LH7A40X    57
  91
  92 /* PPC CPM type number */
  93 #define PORT_CPM        58
  94
  95 /* MPC52xx type numbers */
  96 #define PORT_MPC52xx    59
  97
  98 /* IBM icom */
  99 #define PORT_ICOM       60
 100
 101 /* Samsung S3C2440 SoC */
 102 #define PORT_S3C2440    61
 103
 104 /* Motorola i.MX SoC */
 105 #define PORT_IMX        62
 106
 107 /* Marvell MPSC */
 108 #define PORT_MPSC       63
 109
 110 /* TXX9 type number */
 111 #define PORT_TXX9       64
 112
 113 /* NEC VR4100 series SIU/DSIU */
 114 #define PORT_VR41XX_SIU         65
 115 #define PORT_VR41XX_DSIU        66
 116
 117 /* Samsung S3C2400 SoC */
 118 #define PORT_S3C2400    67
 119
 120 /* M32R SIO */
 121 #define PORT_M32R_SIO   68
 122
 123 /*Digi jsm */
 124 #define PORT_JSM        69
 125
 126 #define PORT_PNX8XXX    70
 127
 128 /* Hilscher netx */
 129 #define PORT_NETX       71
 130
 131 /* SUN4V Hypervisor Console */
 132 #define PORT_SUNHV      72
 133
 134 #define PORT_S3C2412    73
 135
 136 /* Xilinx uartlite */
 137 #define PORT_UARTLITE   74
 138
 139 /* Blackfin bf5xx */
 140 #define PORT_BFIN       75
 141
 142 /* Micrel KS8695 */
 143 #define PORT_KS8695     76
 144
 145
 146 #ifdef __KERNEL__
 147
 148 #include <linux/compiler.h>
 149 #include <linux/interrupt.h>
 150 #include <linux/circ_buf.h>
 151 #include <linux/spinlock.h>
 152 #include <linux/sched.h>
 153 #include <linux/tty.h>
 154 #include <linux/mutex.h>
 155 #include <linux/sysrq.h>
 156
 157 struct uart_port;
 158 struct uart_info;
 159 struct serial_struct;
 160 struct device;
 161
 162 /*
 163  * This structure describes all the operations that can be
 164  * done on the physical hardware.
 165  */
 166 struct uart_ops {
 167         unsigned int    (*tx_empty)(struct uart_port *);
 168         void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 169         unsigned int    (*get_mctrl)(struct uart_port *);
 170         void            (*stop_tx)(struct uart_port *);
 171         void            (*start_tx)(struct uart_port *);
 172         void            (*send_xchar)(struct uart_port *, char ch);
 173         void            (*stop_rx)(struct uart_port *);
 174         void            (*enable_ms)(struct uart_port *);
 175         void            (*break_ctl)(struct uart_port *, int ctl);
 176         int             (*startup)(struct uart_port *);
 177         void            (*shutdown)(struct uart_port *);
 178         void            (*set_termios)(struct uart_port *, struct ktermios *new,
 179                                        struct ktermios *old);
 180         void            (*pm)(struct uart_port *, unsigned int state,
 181                               unsigned int oldstate);
 182         int             (*set_wake)(struct uart_port *, unsigned int state);
 183
 184         /*
 185          * Return a string describing the type of the port
 186          */
 187         const char *(*type)(struct uart_port *);
 188
 189         /*
 190          * Release IO and memory resources used by the port.
 191          * This includes iounmap if necessary.
 192          */
 193         void            (*release_port)(struct uart_port *);
 194
 195         /*
 196          * Request IO and memory resources used by the port.
 197          * This includes iomapping the port if necessary.
 198          */
 199         int             (*request_port)(struct uart_port *);
 200         void            (*config_port)(struct uart_port *, int);
 201         int             (*verify_port)(struct uart_port *, struct serial_struct *);
 202         int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 203 };
 204
 205 #define UART_CONFIG_TYPE        (1 << 0)
 206 #define UART_CONFIG_IRQ         (1 << 1)
 207
 208 struct uart_icount {
 209         __u32   cts;
 210         __u32   dsr;
 211         __u32   rng;
 212         __u32   dcd;
 213         __u32   rx;
 214         __u32   tx;
 215         __u32   frame;
 216         __u32   overrun;
 217         __u32   parity;
 218         __u32   brk;
 219         __u32   buf_overrun;
 220 };
 221
 222 typedef unsigned int __bitwise__ upf_t;
 223
 224 struct uart_port {
 225         spinlock_t              lock;                   /* port lock */
 226         unsigned int            iobase;                 /* in/out[bwl] */
 227         unsigned char __iomem   *membase;               /* read/write[bwl] */
 228         unsigned int            irq;                    /* irq number */
 229         unsigned int            uartclk;                /* base uart clock */
 230         unsigned int            fifosize;               /* tx fifo size */
 231         unsigned char           x_char;                 /* xon/xoff char */
 232         unsigned char           regshift;               /* reg offset shift */
 233         unsigned char           iotype;                 /* io access style */
 234         unsigned char           unused1;
 235
 236 #define UPIO_PORT               (0)
 237 #define UPIO_HUB6               (1)
 238 #define UPIO_MEM                (2)
 239 #define UPIO_MEM32              (3)
 240 #define UPIO_AU                 (4)                     /* Au1x00 type IO */
 241 #define UPIO_TSI                (5)                     /* Tsi108/109 type IO */
 242 #define UPIO_DWAPB              (6)                     /* DesignWare APB UART */
 243 #define UPIO_RM9000             (7)                     /* RM9000 type IO */
 244
 245         unsigned int            read_status_mask;       /* driver specific */
 246         unsigned int            ignore_status_mask;     /* driver specific */
 247         struct uart_info        *info;                  /* pointer to parent info */
 248         struct uart_icount      icount;                 /* statistics */
 249
 250         struct console          *cons;                  /* struct console, if any */
 251 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 252         unsigned long           sysrq;                  /* sysrq timeout */
 253 #endif
 254
 255         upf_t                   flags;
 256
 257 #define UPF_FOURPORT            ((__force upf_t) (1 << 1))
 258 #define UPF_SAK                 ((__force upf_t) (1 << 2))
 259 #define UPF_SPD_MASK            ((__force upf_t) (0x1030))
 260 #define UPF_SPD_HI              ((__force upf_t) (0x0010))
 261 #define UPF_SPD_VHI             ((__force upf_t) (0x0020))
 262 #define UPF_SPD_CUST            ((__force upf_t) (0x0030))
 263 #define UPF_SPD_SHI             ((__force upf_t) (0x1000))
 264 #define UPF_SPD_WARP            ((__force upf_t) (0x1010))
 265 #define UPF_SKIP_TEST           ((__force upf_t) (1 << 6))
 266 #define UPF_AUTO_IRQ            ((__force upf_t) (1 << 7))
 267 #define UPF_HARDPPS_CD          ((__force upf_t) (1 << 11))
 268 #define UPF_LOW_LATENCY         ((__force upf_t) (1 << 13))
 269 #define UPF_BUGGY_UART          ((__force upf_t) (1 << 14))
 270 #define UPF_MAGIC_MULTIPLIER    ((__force upf_t) (1 << 16))
 271 #define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
 272 #define UPF_SHARE_IRQ           ((__force upf_t) (1 << 24))
 273 #define UPF_BOOT_AUTOCONF       ((__force upf_t) (1 << 28))
 274 #define UPF_FIXED_PORT          ((__force upf_t) (1 << 29))
 275 #define UPF_DEAD                ((__force upf_t) (1 << 30))
 276 #define UPF_IOREMAP             ((__force upf_t) (1 << 31))
 277
 278 #define UPF_CHANGE_MASK         ((__force upf_t) (0x17fff))
 279 #define UPF_USR_MASK            ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
 280
 281         unsigned int            mctrl;                  /* current modem ctrl settings */
 282         unsigned int            timeout;                /* character-based timeout */
 283         unsigned int            type;                   /* port type */
 284         const struct uart_ops   *ops;
 285         unsigned int            custom_divisor;
 286         unsigned int            line;                   /* port index */
 287         unsigned long           mapbase;                /* for ioremap */
 288         struct device           *dev;                   /* parent device */
 289         unsigned char           hub6;                   /* this should be in the 8250 driver */
 290         unsigned char           unused[3];
 291         void                    *private_data;          /* generic platform data pointer */
 292 };
 293
 294 /*
 295  * This is the state information which is persistent across opens.
 296  * The low level driver must not to touch any elements contained
 297  * within.
 298  */
 299 struct uart_state {
 300         unsigned int            close_delay;            /* msec */
 301         unsigned int            closing_wait;           /* msec */
 302
 303 #define USF_CLOSING_WAIT_INF    (0)
 304 #define USF_CLOSING_WAIT_NONE   (~0U)
 305
 306         int                     count;
 307         int                     pm_state;
 308         struct uart_info        *info;
 309         struct uart_port        *port;
 310
 311         struct mutex            mutex;
 312 };
 313
 314 #define UART_XMIT_SIZE  PAGE_SIZE
 315
 316 typedef unsigned int __bitwise__ uif_t;
 317
 318 /*
 319  * This is the state information which is only valid when the port
 320  * is open; it may be freed by the core driver once the device has
 321  * been closed.  Either the low level driver or the core can modify
 322  * stuff here.
 323  */
 324 struct uart_info {
 325         struct tty_struct       *tty;
 326         struct circ_buf         xmit;
 327         uif_t                   flags;
 328
 329 /*
 330  * Definitions for info->flags.  These are _private_ to serial_core, and
 331  * are specific to this structure.  They may be queried by low level drivers.
 332  */
 333 #define UIF_CHECK_CD            ((__force uif_t) (1 << 25))
 334 #define UIF_CTS_FLOW            ((__force uif_t) (1 << 26))
 335 #define UIF_NORMAL_ACTIVE       ((__force uif_t) (1 << 29))
 336 #define UIF_INITIALIZED         ((__force uif_t) (1 << 31))
 337 #define UIF_SUSPENDED           ((__force uif_t) (1 << 30))
 338
 339         int                     blocked_open;
 340
 341         struct tasklet_struct   tlet;
 342
 343         wait_queue_head_t       open_wait;
 344         wait_queue_head_t       delta_msr_wait;
 345 };
 346
 347 /* number of characters left in xmit buffer before we ask for more */
 348 #define WAKEUP_CHARS            256
 349
 350 struct module;
 351 struct tty_driver;
 352
 353 struct uart_driver {
 354         struct module           *owner;
 355         const char              *driver_name;
 356         const char              *dev_name;
 357         int                      major;
 358         int                      minor;
 359         int                      nr;
 360         struct console          *cons;
 361
 362         /*
 363          * these are private; the low level driver should not
 364          * touch these; they should be initialised to NULL
 365          */
 366         struct uart_state       *state;
 367         struct tty_driver       *tty_driver;
 368 };
 369
 370 void uart_write_wakeup(struct uart_port *port);
 371
 372 /*
 373  * Baud rate helpers.
 374  */
 375 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 376                          unsigned int baud);
 377 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
 378                                 struct ktermios *old, unsigned int min,
 379                                 unsigned int max);
 380 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 381
 382 /*
 383  * Console helpers.
 384  */
 385 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 386                                    struct console *c);
 387 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 388                         int *flow);
 389 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 390                      int parity, int bits, int flow);
 391 struct tty_driver *uart_console_device(struct console *co, int *index);
 392 void uart_console_write(struct uart_port *port, const char *s,
 393                         unsigned int count,
 394                         void (*putchar)(struct uart_port *, int));
 395
 396 /*
 397  * Port/driver registration/removal
 398  */
 399 int uart_register_driver(struct uart_driver *uart);
 400 void uart_unregister_driver(struct uart_driver *uart);
 401 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 402 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 403 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 404
 405 /*
 406  * Power Management
 407  */
 408 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 409 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 410
 411 #define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 412 #define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 413
 414 #define uart_circ_chars_pending(circ)   \
 415         (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 416
 417 #define uart_circ_chars_free(circ)      \
 418         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 419
 420 #define uart_tx_stopped(port)           \
 421         ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
 422
 423 /*
 424  * The following are helper functions for the low level drivers.
 425  */
 426 static inline int
 427 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
 428 {
 429 #ifdef SUPPORT_SYSRQ
 430         if (port->sysrq) {
 431                 if (ch && time_before(jiffies, port->sysrq)) {
 432                         handle_sysrq(ch, port->info->tty);
 433                         port->sysrq = 0;
 434                         return 1;
 435                 }
 436                 port->sysrq = 0;
 437         }
 438 #endif
 439         return 0;
 440 }
 441 #ifndef SUPPORT_SYSRQ
 442 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
 443 #endif
 444
 445 /*
 446  * We do the SysRQ and SAK checking like this...
 447  */
 448 static inline int uart_handle_break(struct uart_port *port)
 449 {
 450         struct uart_info *info = port->info;
 451 #ifdef SUPPORT_SYSRQ
 452         if (port->cons && port->cons->index == port->line) {
 453                 if (!port->sysrq) {
 454                         port->sysrq = jiffies + HZ*5;
 455                         return 1;
 456                 }
 457                 port->sysrq = 0;
 458         }
 459 #endif
 460         if (port->flags & UPF_SAK)
 461                 do_SAK(info->tty);
 462         return 0;
 463 }
 464
 465 /**
 466  *      uart_handle_dcd_change - handle a change of carrier detect state
 467  *      @port: uart_port structure for the open port
 468  *      @status: new carrier detect status, nonzero if active
 469  */
 470 static inline void
 471 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
 472 {
 473         struct uart_info *info = port->info;
 474
 475         port->icount.dcd++;
 476
 477 #ifdef CONFIG_HARD_PPS
 478         if ((port->flags & UPF_HARDPPS_CD) && status)
 479                 hardpps();
 480 #endif
 481
 482         if (info->flags & UIF_CHECK_CD) {
 483                 if (status)
 484                         wake_up_interruptible(&info->open_wait);
 485                 else if (info->tty)
 486                         tty_hangup(info->tty);
 487         }
 488 }
 489
 490 /**
 491  *      uart_handle_cts_change - handle a change of clear-to-send state
 492  *      @port: uart_port structure for the open port
 493  *      @status: new clear to send status, nonzero if active
 494  */
 495 static inline void
 496 uart_handle_cts_change(struct uart_port *port, unsigned int status)
 497 {
 498         struct uart_info *info = port->info;
 499         struct tty_struct *tty = info->tty;
 500
 501         port->icount.cts++;
 502
 503         if (info->flags & UIF_CTS_FLOW) {
 504                 if (tty->hw_stopped) {
 505                         if (status) {
 506                                 tty->hw_stopped = 0;
 507                                 port->ops->start_tx(port);
 508                                 uart_write_wakeup(port);
 509                         }
 510                 } else {
 511                         if (!status) {
 512                                 tty->hw_stopped = 1;
 513                                 port->ops->stop_tx(port);
 514                         }
 515                 }
 516         }
 517 }
 518
 519 #include <linux/tty_flip.h>
 520
 521 static inline void
 522 uart_insert_char(struct uart_port *port, unsigned int status,
 523                  unsigned int overrun, unsigned int ch, unsigned int flag)
 524 {
 525         struct tty_struct *tty = port->info->tty;
 526
 527         if ((status & port->ignore_status_mask & ~overrun) == 0)
 528                 tty_insert_flip_char(tty, ch, flag);
 529
 530         /*
 531          * Overrun is special.  Since it's reported immediately,
 532          * it doesn't affect the current character.
 533          */
 534         if (status & ~port->ignore_status_mask & overrun)
 535                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 536 }
 537
 538 /*
 539  *      UART_ENABLE_MS - determine if port should enable modem status irqs
 540  */
 541 #define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 542                                          (cflag) & CRTSCTS || \
 543                                          !((cflag) & CLOCAL))
 544
 545 #endif
 546
 547 #endif /* LINUX_SERIAL_CORE_H */