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 #include <linux/serial.h>
  24
  25 /*
  26  * The type definitions.  These are from Ted Ts'o's serial.h
  27  */
  28 #define PORT_UNKNOWN    0
  29 #define PORT_8250       1
  30 #define PORT_16450      2
  31 #define PORT_16550      3
  32 #define PORT_16550A     4
  33 #define PORT_CIRRUS     5
  34 #define PORT_16650      6
  35 #define PORT_16650V2    7
  36 #define PORT_16750      8
  37 #define PORT_STARTECH   9
  38 #define PORT_16C950     10
  39 #define PORT_16654      11
  40 #define PORT_16850      12
  41 #define PORT_RSA        13
  42 #define PORT_NS16550A   14
  43 #define PORT_XSCALE     15
  44 #define PORT_RM9000     16      /* PMC-Sierra RM9xxx internal UART */
  45 #define PORT_OCTEON     17      /* Cavium OCTEON internal UART */
  46 #define PORT_AR7        18      /* Texas Instruments AR7 internal UART */
  47 #define PORT_MAX_8250   18      /* max port ID */
  48
  49 /*
  50  * ARM specific type numbers.  These are not currently guaranteed
  51  * to be implemented, and will change in the future.  These are
  52  * separate so any additions to the old serial.c that occur before
  53  * we are merged can be easily merged here.
  54  */
  55 #define PORT_PXA        31
  56 #define PORT_AMBA       32
  57 #define PORT_CLPS711X   33
  58 #define PORT_SA1100     34
  59 #define PORT_UART00     35
  60 #define PORT_21285      37
  61
  62 /* Sparc type numbers.  */
  63 #define PORT_SUNZILOG   38
  64 #define PORT_SUNSAB     39
  65
  66 /* DEC */
  67 #define PORT_DZ         46
  68 #define PORT_ZS         47
  69
  70 /* Parisc type numbers. */
  71 #define PORT_MUX        48
  72
  73 /* Atmel AT91 / AT32 SoC */
  74 #define PORT_ATMEL      49
  75
  76 /* Macintosh Zilog type numbers */
  77 #define PORT_MAC_ZILOG  50      /* m68k : not yet implemented */
  78 #define PORT_PMAC_ZILOG 51
  79
  80 /* SH-SCI */
  81 #define PORT_SCI        52
  82 #define PORT_SCIF       53
  83 #define PORT_IRDA       54
  84
  85 /* Samsung S3C2410 SoC and derivatives thereof */
  86 #define PORT_S3C2410    55
  87
  88 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
  89 #define PORT_IP22ZILOG  56
  90
  91 /* Sharp LH7a40x -- an ARM9 SoC series */
  92 #define PORT_LH7A40X    57
  93
  94 /* PPC CPM type number */
  95 #define PORT_CPM        58
  96
  97 /* MPC52xx type numbers */
  98 #define PORT_MPC52xx    59
  99
 100 /* IBM icom */
 101 #define PORT_ICOM       60
 102
 103 /* Samsung S3C2440 SoC */
 104 #define PORT_S3C2440    61
 105
 106 /* Motorola i.MX SoC */
 107 #define PORT_IMX        62
 108
 109 /* Marvell MPSC */
 110 #define PORT_MPSC       63
 111
 112 /* TXX9 type number */
 113 #define PORT_TXX9       64
 114
 115 /* NEC VR4100 series SIU/DSIU */
 116 #define PORT_VR41XX_SIU         65
 117 #define PORT_VR41XX_DSIU        66
 118
 119 /* Samsung S3C2400 SoC */
 120 #define PORT_S3C2400    67
 121
 122 /* M32R SIO */
 123 #define PORT_M32R_SIO   68
 124
 125 /*Digi jsm */
 126 #define PORT_JSM        69
 127
 128 #define PORT_PNX8XXX    70
 129
 130 /* Hilscher netx */
 131 #define PORT_NETX       71
 132
 133 /* SUN4V Hypervisor Console */
 134 #define PORT_SUNHV      72
 135
 136 #define PORT_S3C2412    73
 137
 138 /* Xilinx uartlite */
 139 #define PORT_UARTLITE   74
 140
 141 /* Blackfin bf5xx */
 142 #define PORT_BFIN       75
 143
 144 /* Micrel KS8695 */
 145 #define PORT_KS8695     76
 146
 147 /* Broadcom SB1250, etc. SOC */
 148 #define PORT_SB1250_DUART       77
 149
 150 /* Freescale ColdFire */
 151 #define PORT_MCF        78
 152
 153 /* Blackfin SPORT */
 154 #define PORT_BFIN_SPORT         79
 155
 156 /* MN10300 on-chip UART numbers */
 157 #define PORT_MN10300            80
 158 #define PORT_MN10300_CTS        81
 159
 160 #define PORT_SC26XX     82
 161
 162 /* SH-SCI */
 163 #define PORT_SCIFA      83
 164
 165 #define PORT_S3C6400    84
 166
 167 /* NWPSERIAL */
 168 #define PORT_NWPSERIAL  85
 169
 170 /* MAX3100 */
 171 #define PORT_MAX3100    86
 172
 173 /* Timberdale UART */
 174 #define PORT_TIMBUART   87
 175
 176 /* Qualcomm MSM SoCs */
 177 #define PORT_MSM        88
 178
 179 /* BCM63xx family SoCs */
 180 #define PORT_BCM63XX    89
 181
 182 /* Aeroflex Gaisler GRLIB APBUART */
 183 #define PORT_APBUART    90
 184
 185 #ifdef __KERNEL__
 186
 187 #include <linux/compiler.h>
 188 #include <linux/interrupt.h>
 189 #include <linux/circ_buf.h>
 190 #include <linux/spinlock.h>
 191 #include <linux/sched.h>
 192 #include <linux/tty.h>
 193 #include <linux/mutex.h>
 194 #include <linux/sysrq.h>
 195
 196 struct uart_port;
 197 struct serial_struct;
 198 struct device;
 199
 200 /*
 201  * This structure describes all the operations that can be
 202  * done on the physical hardware.
 203  */
 204 struct uart_ops {
 205         unsigned int    (*tx_empty)(struct uart_port *);
 206         void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 207         unsigned int    (*get_mctrl)(struct uart_port *);
 208         void            (*stop_tx)(struct uart_port *);
 209         void            (*start_tx)(struct uart_port *);
 210         void            (*send_xchar)(struct uart_port *, char ch);
 211         void            (*stop_rx)(struct uart_port *);
 212         void            (*enable_ms)(struct uart_port *);
 213         void            (*break_ctl)(struct uart_port *, int ctl);
 214         int             (*startup)(struct uart_port *);
 215         void            (*shutdown)(struct uart_port *);
 216         void            (*flush_buffer)(struct uart_port *);
 217         void            (*set_termios)(struct uart_port *, struct ktermios *new,
 218                                        struct ktermios *old);
 219         void            (*set_ldisc)(struct uart_port *);
 220         void            (*pm)(struct uart_port *, unsigned int state,
 221                               unsigned int oldstate);
 222         int             (*set_wake)(struct uart_port *, unsigned int state);
 223
 224         /*
 225          * Return a string describing the type of the port
 226          */
 227         const char *(*type)(struct uart_port *);
 228
 229         /*
 230          * Release IO and memory resources used by the port.
 231          * This includes iounmap if necessary.
 232          */
 233         void            (*release_port)(struct uart_port *);
 234
 235         /*
 236          * Request IO and memory resources used by the port.
 237          * This includes iomapping the port if necessary.
 238          */
 239         int             (*request_port)(struct uart_port *);
 240         void            (*config_port)(struct uart_port *, int);
 241         int             (*verify_port)(struct uart_port *, struct serial_struct *);
 242         int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 243 #ifdef CONFIG_CONSOLE_POLL
 244         void    (*poll_put_char)(struct uart_port *, unsigned char);
 245         int             (*poll_get_char)(struct uart_port *);
 246 #endif
 247 };
 248
 249 #define UART_CONFIG_TYPE        (1 << 0)
 250 #define UART_CONFIG_IRQ         (1 << 1)
 251
 252 struct uart_icount {
 253         __u32   cts;
 254         __u32   dsr;
 255         __u32   rng;
 256         __u32   dcd;
 257         __u32   rx;
 258         __u32   tx;
 259         __u32   frame;
 260         __u32   overrun;
 261         __u32   parity;
 262         __u32   brk;
 263         __u32   buf_overrun;
 264 };
 265
 266 typedef unsigned int __bitwise__ upf_t;
 267
 268 struct uart_port {
 269         spinlock_t              lock;                   /* port lock */
 270         unsigned long           iobase;                 /* in/out[bwl] */
 271         unsigned char __iomem   *membase;               /* read/write[bwl] */
 272         unsigned int            (*serial_in)(struct uart_port *, int);
 273         void                    (*serial_out)(struct uart_port *, int, int);
 274         unsigned int            irq;                    /* irq number */
 275         unsigned long           irqflags;               /* irq flags  */
 276         unsigned int            uartclk;                /* base uart clock */
 277         unsigned int            fifosize;               /* tx fifo size */
 278         unsigned char           x_char;                 /* xon/xoff char */
 279         unsigned char           regshift;               /* reg offset shift */
 280         unsigned char           iotype;                 /* io access style */
 281         unsigned char           unused1;
 282
 283 #define UPIO_PORT               (0)
 284 #define UPIO_HUB6               (1)
 285 #define UPIO_MEM                (2)
 286 #define UPIO_MEM32              (3)
 287 #define UPIO_AU                 (4)                     /* Au1x00 type IO */
 288 #define UPIO_TSI                (5)                     /* Tsi108/109 type IO */
 289 #define UPIO_DWAPB              (6)                     /* DesignWare APB UART */
 290 #define UPIO_RM9000             (7)                     /* RM9000 type IO */
 291
 292         unsigned int            read_status_mask;       /* driver specific */
 293         unsigned int            ignore_status_mask;     /* driver specific */
 294         struct uart_state       *state;                 /* pointer to parent state */
 295         struct uart_icount      icount;                 /* statistics */
 296
 297         struct console          *cons;                  /* struct console, if any */
 298 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
 299         unsigned long           sysrq;                  /* sysrq timeout */
 300 #endif
 301
 302         upf_t                   flags;
 303
 304 #define UPF_FOURPORT            ((__force upf_t) (1 << 1))
 305 #define UPF_SAK                 ((__force upf_t) (1 << 2))
 306 #define UPF_SPD_MASK            ((__force upf_t) (0x1030))
 307 #define UPF_SPD_HI              ((__force upf_t) (0x0010))
 308 #define UPF_SPD_VHI             ((__force upf_t) (0x0020))
 309 #define UPF_SPD_CUST            ((__force upf_t) (0x0030))
 310 #define UPF_SPD_SHI             ((__force upf_t) (0x1000))
 311 #define UPF_SPD_WARP            ((__force upf_t) (0x1010))
 312 #define UPF_SKIP_TEST           ((__force upf_t) (1 << 6))
 313 #define UPF_AUTO_IRQ            ((__force upf_t) (1 << 7))
 314 #define UPF_HARDPPS_CD          ((__force upf_t) (1 << 11))
 315 #define UPF_LOW_LATENCY         ((__force upf_t) (1 << 13))
 316 #define UPF_BUGGY_UART          ((__force upf_t) (1 << 14))
 317 #define UPF_NO_TXEN_TEST        ((__force upf_t) (1 << 15))
 318 #define UPF_MAGIC_MULTIPLIER    ((__force upf_t) (1 << 16))
 319 #define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
 320 #define UPF_SHARE_IRQ           ((__force upf_t) (1 << 24))
 321 /* The exact UART type is known and should not be probed.  */
 322 #define UPF_FIXED_TYPE          ((__force upf_t) (1 << 27))
 323 #define UPF_BOOT_AUTOCONF       ((__force upf_t) (1 << 28))
 324 #define UPF_FIXED_PORT          ((__force upf_t) (1 << 29))
 325 #define UPF_DEAD                ((__force upf_t) (1 << 30))
 326 #define UPF_IOREMAP             ((__force upf_t) (1 << 31))
 327
 328 #define UPF_CHANGE_MASK         ((__force upf_t) (0x17fff))
 329 #define UPF_USR_MASK            ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
 330
 331         unsigned int            mctrl;                  /* current modem ctrl settings */
 332         unsigned int            timeout;                /* character-based timeout */
 333         unsigned int            type;                   /* port type */
 334         const struct uart_ops   *ops;
 335         unsigned int            custom_divisor;
 336         unsigned int            line;                   /* port index */
 337         resource_size_t         mapbase;                /* for ioremap */
 338         struct device           *dev;                   /* parent device */
 339         unsigned char           hub6;                   /* this should be in the 8250 driver */
 340         unsigned char           suspended;
 341         unsigned char           unused[2];
 342         void                    *private_data;          /* generic platform data pointer */
 343 };
 344
 345 /*
 346  * This is the state information which is persistent across opens.
 347  */
 348 struct uart_state {
 349         struct tty_port         port;
 350
 351         int                     pm_state;
 352         struct circ_buf         xmit;
 353
 354         struct tasklet_struct   tlet;
 355         struct uart_port        *uart_port;
 356 };
 357
 358 #define UART_XMIT_SIZE  PAGE_SIZE
 359
 360
 361 /* number of characters left in xmit buffer before we ask for more */
 362 #define WAKEUP_CHARS            256
 363
 364 struct module;
 365 struct tty_driver;
 366
 367 struct uart_driver {
 368         struct module           *owner;
 369         const char              *driver_name;
 370         const char              *dev_name;
 371         int                      major;
 372         int                      minor;
 373         int                      nr;
 374         struct console          *cons;
 375
 376         /*
 377          * these are private; the low level driver should not
 378          * touch these; they should be initialised to NULL
 379          */
 380         struct uart_state       *state;
 381         struct tty_driver       *tty_driver;
 382 };
 383
 384 void uart_write_wakeup(struct uart_port *port);
 385
 386 /*
 387  * Baud rate helpers.
 388  */
 389 void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 390                          unsigned int baud);
 391 unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
 392                                 struct ktermios *old, unsigned int min,
 393                                 unsigned int max);
 394 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 395
 396 /*
 397  * Console helpers.
 398  */
 399 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 400                                    struct console *c);
 401 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 402                         int *flow);
 403 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 404                      int parity, int bits, int flow);
 405 struct tty_driver *uart_console_device(struct console *co, int *index);
 406 void uart_console_write(struct uart_port *port, const char *s,
 407                         unsigned int count,
 408                         void (*putchar)(struct uart_port *, int));
 409
 410 /*
 411  * Port/driver registration/removal
 412  */
 413 int uart_register_driver(struct uart_driver *uart);
 414 void uart_unregister_driver(struct uart_driver *uart);
 415 int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 416 int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 417 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 418
 419 /*
 420  * Power Management
 421  */
 422 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 423 int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 424
 425 #define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 426 #define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 427
 428 #define uart_circ_chars_pending(circ)   \
 429         (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 430
 431 #define uart_circ_chars_free(circ)      \
 432         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 433
 434 static inline int uart_tx_stopped(struct uart_port *port)
 435 {
 436         struct tty_struct *tty = port->state->port.tty;
 437         if(tty->stopped || tty->hw_stopped)
 438                 return 1;
 439         return 0;
 440 }
 441
 442 /*
 443  * The following are helper functions for the low level drivers.
 444  */
 445 static inline int
 446 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
 447 {
 448 #ifdef SUPPORT_SYSRQ
 449         if (port->sysrq) {
 450                 if (ch && time_before(jiffies, port->sysrq)) {
 451                         handle_sysrq(ch, port->state->port.tty);
 452                         port->sysrq = 0;
 453                         return 1;
 454                 }
 455                 port->sysrq = 0;
 456         }
 457 #endif
 458         return 0;
 459 }
 460 #ifndef SUPPORT_SYSRQ
 461 #define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 0)
 462 #endif
 463
 464 /*
 465  * We do the SysRQ and SAK checking like this...
 466  */
 467 static inline int uart_handle_break(struct uart_port *port)
 468 {
 469         struct uart_state *state = port->state;
 470 #ifdef SUPPORT_SYSRQ
 471         if (port->cons && port->cons->index == port->line) {
 472                 if (!port->sysrq) {
 473                         port->sysrq = jiffies + HZ*5;
 474                         return 1;
 475                 }
 476                 port->sysrq = 0;
 477         }
 478 #endif
 479         if (port->flags & UPF_SAK)
 480                 do_SAK(state->port.tty);
 481         return 0;
 482 }
 483
 484 /**
 485  *      uart_handle_dcd_change - handle a change of carrier detect state
 486  *      @uport: uart_port structure for the open port
 487  *      @status: new carrier detect status, nonzero if active
 488  */
 489 static inline void
 490 uart_handle_dcd_change(struct uart_port *uport, unsigned int status)
 491 {
 492         struct uart_state *state = uport->state;
 493         struct tty_port *port = &state->port;
 494         struct tty_ldisc *ld = tty_ldisc_ref(port->tty);
 495         struct timespec ts;
 496
 497         if (ld && ld->ops->dcd_change)
 498                 getnstimeofday(&ts);
 499
 500         uport->icount.dcd++;
 501 #ifdef CONFIG_HARD_PPS
 502         if ((uport->flags & UPF_HARDPPS_CD) && status)
 503                 hardpps();
 504 #endif
 505
 506         if (port->flags & ASYNC_CHECK_CD) {
 507                 if (status)
 508                         wake_up_interruptible(&port->open_wait);
 509                 else if (port->tty)
 510                         tty_hangup(port->tty);
 511         }
 512
 513         if (ld && ld->ops->dcd_change)
 514                 ld->ops->dcd_change(port->tty, status, &ts);
 515         if (ld)
 516                 tty_ldisc_deref(ld);
 517 }
 518
 519 /**
 520  *      uart_handle_cts_change - handle a change of clear-to-send state
 521  *      @uport: uart_port structure for the open port
 522  *      @status: new clear to send status, nonzero if active
 523  */
 524 static inline void
 525 uart_handle_cts_change(struct uart_port *uport, unsigned int status)
 526 {
 527         struct tty_port *port = &uport->state->port;
 528         struct tty_struct *tty = port->tty;
 529
 530         uport->icount.cts++;
 531
 532         if (port->flags & ASYNC_CTS_FLOW) {
 533                 if (tty->hw_stopped) {
 534                         if (status) {
 535                                 tty->hw_stopped = 0;
 536                                 uport->ops->start_tx(uport);
 537                                 uart_write_wakeup(uport);
 538                         }
 539                 } else {
 540                         if (!status) {
 541                                 tty->hw_stopped = 1;
 542                                 uport->ops->stop_tx(uport);
 543                         }
 544                 }
 545         }
 546 }
 547
 548 #include <linux/tty_flip.h>
 549
 550 static inline void
 551 uart_insert_char(struct uart_port *port, unsigned int status,
 552                  unsigned int overrun, unsigned int ch, unsigned int flag)
 553 {
 554         struct tty_struct *tty = port->state->port.tty;
 555
 556         if ((status & port->ignore_status_mask & ~overrun) == 0)
 557                 tty_insert_flip_char(tty, ch, flag);
 558
 559         /*
 560          * Overrun is special.  Since it's reported immediately,
 561          * it doesn't affect the current character.
 562          */
 563         if (status & ~port->ignore_status_mask & overrun)
 564                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 565 }
 566
 567 /*
 568  *      UART_ENABLE_MS - determine if port should enable modem status irqs
 569  */
 570 #define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 571                                          (cflag) & CRTSCTS || \
 572                                          !((cflag) & CLOCAL))
 573
 574 #endif
 575
 576 #endif /* LINUX_SERIAL_CORE_H */