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