linux/include/linux/serial_core.h
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   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_U6_16550A  19      /* ST-Ericsson U6xxx internal UART */
  48#define PORT_TEGRA      20      /* NVIDIA Tegra internal UART */
  49#define PORT_XR17D15X   21      /* Exar XR17D15x UART */
  50#define PORT_LPC3220    22      /* NXP LPC32xx SoC "Standard" UART */
  51#define PORT_MAX_8250   22      /* max port ID */
  52
  53/*
  54 * ARM specific type numbers.  These are not currently guaranteed
  55 * to be implemented, and will change in the future.  These are
  56 * separate so any additions to the old serial.c that occur before
  57 * we are merged can be easily merged here.
  58 */
  59#define PORT_PXA        31
  60#define PORT_AMBA       32
  61#define PORT_CLPS711X   33
  62#define PORT_SA1100     34
  63#define PORT_UART00     35
  64#define PORT_21285      37
  65
  66/* Sparc type numbers.  */
  67#define PORT_SUNZILOG   38
  68#define PORT_SUNSAB     39
  69
  70/* DEC */
  71#define PORT_DZ         46
  72#define PORT_ZS         47
  73
  74/* Parisc type numbers. */
  75#define PORT_MUX        48
  76
  77/* Atmel AT91 / AT32 SoC */
  78#define PORT_ATMEL      49
  79
  80/* Macintosh Zilog type numbers */
  81#define PORT_MAC_ZILOG  50      /* m68k : not yet implemented */
  82#define PORT_PMAC_ZILOG 51
  83
  84/* SH-SCI */
  85#define PORT_SCI        52
  86#define PORT_SCIF       53
  87#define PORT_IRDA       54
  88
  89/* Samsung S3C2410 SoC and derivatives thereof */
  90#define PORT_S3C2410    55
  91
  92/* SGI IP22 aka Indy / Challenge S / Indigo 2 */
  93#define PORT_IP22ZILOG  56
  94
  95/* Sharp LH7a40x -- an ARM9 SoC series */
  96#define PORT_LH7A40X    57
  97
  98/* PPC CPM type number */
  99#define PORT_CPM        58
 100
 101/* MPC52xx (and MPC512x) type numbers */
 102#define PORT_MPC52xx    59
 103
 104/* IBM icom */
 105#define PORT_ICOM       60
 106
 107/* Samsung S3C2440 SoC */
 108#define PORT_S3C2440    61
 109
 110/* Motorola i.MX SoC */
 111#define PORT_IMX        62
 112
 113/* Marvell MPSC */
 114#define PORT_MPSC       63
 115
 116/* TXX9 type number */
 117#define PORT_TXX9       64
 118
 119/* NEC VR4100 series SIU/DSIU */
 120#define PORT_VR41XX_SIU         65
 121#define PORT_VR41XX_DSIU        66
 122
 123/* Samsung S3C2400 SoC */
 124#define PORT_S3C2400    67
 125
 126/* M32R SIO */
 127#define PORT_M32R_SIO   68
 128
 129/*Digi jsm */
 130#define PORT_JSM        69
 131
 132#define PORT_PNX8XXX    70
 133
 134/* Hilscher netx */
 135#define PORT_NETX       71
 136
 137/* SUN4V Hypervisor Console */
 138#define PORT_SUNHV      72
 139
 140#define PORT_S3C2412    73
 141
 142/* Xilinx uartlite */
 143#define PORT_UARTLITE   74
 144
 145/* Blackfin bf5xx */
 146#define PORT_BFIN       75
 147
 148/* Micrel KS8695 */
 149#define PORT_KS8695     76
 150
 151/* Broadcom SB1250, etc. SOC */
 152#define PORT_SB1250_DUART       77
 153
 154/* Freescale ColdFire */
 155#define PORT_MCF        78
 156
 157/* Blackfin SPORT */
 158#define PORT_BFIN_SPORT         79
 159
 160/* MN10300 on-chip UART numbers */
 161#define PORT_MN10300            80
 162#define PORT_MN10300_CTS        81
 163
 164#define PORT_SC26XX     82
 165
 166/* SH-SCI */
 167#define PORT_SCIFA      83
 168
 169#define PORT_S3C6400    84
 170
 171/* NWPSERIAL */
 172#define PORT_NWPSERIAL  85
 173
 174/* MAX3100 */
 175#define PORT_MAX3100    86
 176
 177/* Timberdale UART */
 178#define PORT_TIMBUART   87
 179
 180/* Qualcomm MSM SoCs */
 181#define PORT_MSM        88
 182
 183/* BCM63xx family SoCs */
 184#define PORT_BCM63XX    89
 185
 186/* Aeroflex Gaisler GRLIB APBUART */
 187#define PORT_APBUART    90
 188
 189/* Altera UARTs */
 190#define PORT_ALTERA_JTAGUART    91
 191#define PORT_ALTERA_UART        92
 192
 193/* SH-SCI */
 194#define PORT_SCIFB      93
 195
 196/* MAX3107 */
 197#define PORT_MAX3107    94
 198
 199/* High Speed UART for Medfield */
 200#define PORT_MFD        95
 201
 202/* TI OMAP-UART */
 203#define PORT_OMAP       96
 204
 205/* VIA VT8500 SoC */
 206#define PORT_VT8500     97
 207
 208/* Xilinx PSS UART */
 209#define PORT_XUARTPS    98
 210
 211/* Atheros AR933X SoC */
 212#define PORT_AR933X     99
 213
 214/* Energy Micro efm32 SoC */
 215#define PORT_EFMUART   100
 216
 217#ifdef __KERNEL__
 218
 219#include <linux/compiler.h>
 220#include <linux/interrupt.h>
 221#include <linux/circ_buf.h>
 222#include <linux/spinlock.h>
 223#include <linux/sched.h>
 224#include <linux/tty.h>
 225#include <linux/mutex.h>
 226#include <linux/sysrq.h>
 227#include <linux/pps_kernel.h>
 228
 229struct uart_port;
 230struct serial_struct;
 231struct device;
 232
 233/*
 234 * This structure describes all the operations that can be
 235 * done on the physical hardware.
 236 */
 237struct uart_ops {
 238        unsigned int    (*tx_empty)(struct uart_port *);
 239        void            (*set_mctrl)(struct uart_port *, unsigned int mctrl);
 240        unsigned int    (*get_mctrl)(struct uart_port *);
 241        void            (*stop_tx)(struct uart_port *);
 242        void            (*start_tx)(struct uart_port *);
 243        void            (*send_xchar)(struct uart_port *, char ch);
 244        void            (*stop_rx)(struct uart_port *);
 245        void            (*enable_ms)(struct uart_port *);
 246        void            (*break_ctl)(struct uart_port *, int ctl);
 247        int             (*startup)(struct uart_port *);
 248        void            (*shutdown)(struct uart_port *);
 249        void            (*flush_buffer)(struct uart_port *);
 250        void            (*set_termios)(struct uart_port *, struct ktermios *new,
 251                                       struct ktermios *old);
 252        void            (*set_ldisc)(struct uart_port *, int new);
 253        void            (*pm)(struct uart_port *, unsigned int state,
 254                              unsigned int oldstate);
 255        int             (*set_wake)(struct uart_port *, unsigned int state);
 256
 257        /*
 258         * Return a string describing the type of the port
 259         */
 260        const char *(*type)(struct uart_port *);
 261
 262        /*
 263         * Release IO and memory resources used by the port.
 264         * This includes iounmap if necessary.
 265         */
 266        void            (*release_port)(struct uart_port *);
 267
 268        /*
 269         * Request IO and memory resources used by the port.
 270         * This includes iomapping the port if necessary.
 271         */
 272        int             (*request_port)(struct uart_port *);
 273        void            (*config_port)(struct uart_port *, int);
 274        int             (*verify_port)(struct uart_port *, struct serial_struct *);
 275        int             (*ioctl)(struct uart_port *, unsigned int, unsigned long);
 276#ifdef CONFIG_CONSOLE_POLL
 277        void    (*poll_put_char)(struct uart_port *, unsigned char);
 278        int             (*poll_get_char)(struct uart_port *);
 279#endif
 280};
 281
 282#define NO_POLL_CHAR            0x00ff0000
 283#define UART_CONFIG_TYPE        (1 << 0)
 284#define UART_CONFIG_IRQ         (1 << 1)
 285
 286struct uart_icount {
 287        __u32   cts;
 288        __u32   dsr;
 289        __u32   rng;
 290        __u32   dcd;
 291        __u32   rx;
 292        __u32   tx;
 293        __u32   frame;
 294        __u32   overrun;
 295        __u32   parity;
 296        __u32   brk;
 297        __u32   buf_overrun;
 298};
 299
 300typedef unsigned int __bitwise__ upf_t;
 301
 302struct uart_port {
 303        spinlock_t              lock;                   /* port lock */
 304        unsigned long           iobase;                 /* in/out[bwl] */
 305        unsigned char __iomem   *membase;               /* read/write[bwl] */
 306        unsigned int            (*serial_in)(struct uart_port *, int);
 307        void                    (*serial_out)(struct uart_port *, int, int);
 308        void                    (*set_termios)(struct uart_port *,
 309                                               struct ktermios *new,
 310                                               struct ktermios *old);
 311        int                     (*handle_irq)(struct uart_port *);
 312        void                    (*pm)(struct uart_port *, unsigned int state,
 313                                      unsigned int old);
 314        void                    (*handle_break)(struct uart_port *);
 315        unsigned int            irq;                    /* irq number */
 316        unsigned long           irqflags;               /* irq flags  */
 317        unsigned int            uartclk;                /* base uart clock */
 318        unsigned int            fifosize;               /* tx fifo size */
 319        unsigned char           x_char;                 /* xon/xoff char */
 320        unsigned char           regshift;               /* reg offset shift */
 321        unsigned char           iotype;                 /* io access style */
 322        unsigned char           unused1;
 323
 324#define UPIO_PORT               (0)
 325#define UPIO_HUB6               (1)
 326#define UPIO_MEM                (2)
 327#define UPIO_MEM32              (3)
 328#define UPIO_AU                 (4)                     /* Au1x00 type IO */
 329#define UPIO_TSI                (5)                     /* Tsi108/109 type IO */
 330#define UPIO_RM9000             (6)                     /* RM9000 type IO */
 331
 332        unsigned int            read_status_mask;       /* driver specific */
 333        unsigned int            ignore_status_mask;     /* driver specific */
 334        struct uart_state       *state;                 /* pointer to parent state */
 335        struct uart_icount      icount;                 /* statistics */
 336
 337        struct console          *cons;                  /* struct console, if any */
 338#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
 339        unsigned long           sysrq;                  /* sysrq timeout */
 340#endif
 341
 342        upf_t                   flags;
 343
 344#define UPF_FOURPORT            ((__force upf_t) (1 << 1))
 345#define UPF_SAK                 ((__force upf_t) (1 << 2))
 346#define UPF_SPD_MASK            ((__force upf_t) (0x1030))
 347#define UPF_SPD_HI              ((__force upf_t) (0x0010))
 348#define UPF_SPD_VHI             ((__force upf_t) (0x0020))
 349#define UPF_SPD_CUST            ((__force upf_t) (0x0030))
 350#define UPF_SPD_SHI             ((__force upf_t) (0x1000))
 351#define UPF_SPD_WARP            ((__force upf_t) (0x1010))
 352#define UPF_SKIP_TEST           ((__force upf_t) (1 << 6))
 353#define UPF_AUTO_IRQ            ((__force upf_t) (1 << 7))
 354#define UPF_HARDPPS_CD          ((__force upf_t) (1 << 11))
 355#define UPF_LOW_LATENCY         ((__force upf_t) (1 << 13))
 356#define UPF_BUGGY_UART          ((__force upf_t) (1 << 14))
 357#define UPF_NO_TXEN_TEST        ((__force upf_t) (1 << 15))
 358#define UPF_MAGIC_MULTIPLIER    ((__force upf_t) (1 << 16))
 359#define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
 360#define UPF_SHARE_IRQ           ((__force upf_t) (1 << 24))
 361#define UPF_EXAR_EFR            ((__force upf_t) (1 << 25))
 362#define UPF_BUG_THRE            ((__force upf_t) (1 << 26))
 363/* The exact UART type is known and should not be probed.  */
 364#define UPF_FIXED_TYPE          ((__force upf_t) (1 << 27))
 365#define UPF_BOOT_AUTOCONF       ((__force upf_t) (1 << 28))
 366#define UPF_FIXED_PORT          ((__force upf_t) (1 << 29))
 367#define UPF_DEAD                ((__force upf_t) (1 << 30))
 368#define UPF_IOREMAP             ((__force upf_t) (1 << 31))
 369
 370#define UPF_CHANGE_MASK         ((__force upf_t) (0x17fff))
 371#define UPF_USR_MASK            ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
 372
 373        unsigned int            mctrl;                  /* current modem ctrl settings */
 374        unsigned int            timeout;                /* character-based timeout */
 375        unsigned int            type;                   /* port type */
 376        const struct uart_ops   *ops;
 377        unsigned int            custom_divisor;
 378        unsigned int            line;                   /* port index */
 379        resource_size_t         mapbase;                /* for ioremap */
 380        struct device           *dev;                   /* parent device */
 381        unsigned char           hub6;                   /* this should be in the 8250 driver */
 382        unsigned char           suspended;
 383        unsigned char           irq_wake;
 384        unsigned char           unused[2];
 385        void                    *private_data;          /* generic platform data pointer */
 386};
 387
 388static inline int serial_port_in(struct uart_port *up, int offset)
 389{
 390        return up->serial_in(up, offset);
 391}
 392
 393static inline void serial_port_out(struct uart_port *up, int offset, int value)
 394{
 395        up->serial_out(up, offset, value);
 396}
 397
 398/*
 399 * This is the state information which is persistent across opens.
 400 */
 401struct uart_state {
 402        struct tty_port         port;
 403
 404        int                     pm_state;
 405        struct circ_buf         xmit;
 406
 407        struct uart_port        *uart_port;
 408};
 409
 410#define UART_XMIT_SIZE  PAGE_SIZE
 411
 412
 413/* number of characters left in xmit buffer before we ask for more */
 414#define WAKEUP_CHARS            256
 415
 416struct module;
 417struct tty_driver;
 418
 419struct uart_driver {
 420        struct module           *owner;
 421        const char              *driver_name;
 422        const char              *dev_name;
 423        int                      major;
 424        int                      minor;
 425        int                      nr;
 426        struct console          *cons;
 427
 428        /*
 429         * these are private; the low level driver should not
 430         * touch these; they should be initialised to NULL
 431         */
 432        struct uart_state       *state;
 433        struct tty_driver       *tty_driver;
 434};
 435
 436void uart_write_wakeup(struct uart_port *port);
 437
 438/*
 439 * Baud rate helpers.
 440 */
 441void uart_update_timeout(struct uart_port *port, unsigned int cflag,
 442                         unsigned int baud);
 443unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
 444                                struct ktermios *old, unsigned int min,
 445                                unsigned int max);
 446unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
 447
 448/* Base timer interval for polling */
 449static inline int uart_poll_timeout(struct uart_port *port)
 450{
 451        int timeout = port->timeout;
 452
 453        return timeout > 6 ? (timeout / 2 - 2) : 1;
 454}
 455
 456/*
 457 * Console helpers.
 458 */
 459struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 460                                   struct console *c);
 461void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 462                        int *flow);
 463int uart_set_options(struct uart_port *port, struct console *co, int baud,
 464                     int parity, int bits, int flow);
 465struct tty_driver *uart_console_device(struct console *co, int *index);
 466void uart_console_write(struct uart_port *port, const char *s,
 467                        unsigned int count,
 468                        void (*putchar)(struct uart_port *, int));
 469
 470/*
 471 * Port/driver registration/removal
 472 */
 473int uart_register_driver(struct uart_driver *uart);
 474void uart_unregister_driver(struct uart_driver *uart);
 475int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
 476int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
 477int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 478
 479/*
 480 * Power Management
 481 */
 482int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
 483int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 484
 485#define uart_circ_empty(circ)           ((circ)->head == (circ)->tail)
 486#define uart_circ_clear(circ)           ((circ)->head = (circ)->tail = 0)
 487
 488#define uart_circ_chars_pending(circ)   \
 489        (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 490
 491#define uart_circ_chars_free(circ)      \
 492        (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 493
 494static inline int uart_tx_stopped(struct uart_port *port)
 495{
 496        struct tty_struct *tty = port->state->port.tty;
 497        if(tty->stopped || tty->hw_stopped)
 498                return 1;
 499        return 0;
 500}
 501
 502/*
 503 * The following are helper functions for the low level drivers.
 504 */
 505
 506extern void uart_handle_dcd_change(struct uart_port *uport,
 507                unsigned int status);
 508extern void uart_handle_cts_change(struct uart_port *uport,
 509                unsigned int status);
 510
 511extern void uart_insert_char(struct uart_port *port, unsigned int status,
 512                 unsigned int overrun, unsigned int ch, unsigned int flag);
 513
 514#ifdef SUPPORT_SYSRQ
 515static inline int
 516uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
 517{
 518        if (port->sysrq) {
 519                if (ch && time_before(jiffies, port->sysrq)) {
 520                        handle_sysrq(ch);
 521                        port->sysrq = 0;
 522                        return 1;
 523                }
 524                port->sysrq = 0;
 525        }
 526        return 0;
 527}
 528#else
 529#define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
 530#endif
 531
 532/*
 533 * We do the SysRQ and SAK checking like this...
 534 */
 535static inline int uart_handle_break(struct uart_port *port)
 536{
 537        struct uart_state *state = port->state;
 538
 539        if (port->handle_break)
 540                port->handle_break(port);
 541
 542#ifdef SUPPORT_SYSRQ
 543        if (port->cons && port->cons->index == port->line) {
 544                if (!port->sysrq) {
 545                        port->sysrq = jiffies + HZ*5;
 546                        return 1;
 547                }
 548                port->sysrq = 0;
 549        }
 550#endif
 551        if (port->flags & UPF_SAK)
 552                do_SAK(state->port.tty);
 553        return 0;
 554}
 555
 556/*
 557 *      UART_ENABLE_MS - determine if port should enable modem status irqs
 558 */
 559#define UART_ENABLE_MS(port,cflag)      ((port)->flags & UPF_HARDPPS_CD || \
 560                                         (cflag) & CRTSCTS || \
 561                                         !((cflag) & CLOCAL))
 562
 563#endif
 564
 565#endif /* LINUX_SERIAL_CORE_H */
 566
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