drivers/net/wan/z85230.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *      Description of Z8530 Z85C30 and Z85230 communications chips
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  * Copyright (C) 1998 Alan Cox <alan@lxorguk.ukuu.org.uk>
   7  */
   8
   9 #ifndef _Z8530_H
  10 #define _Z8530_H
  11
  12 #include <linux/tty.h>
  13 #include <linux/interrupt.h>
  14
  15 /* Conversion routines to/from brg time constants from/to bits
  16  * per second.
  17  */
  18 #define BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
  19 #define BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)
  20
  21 /* The Zilog register set */
  22
  23 #define FLAG    0x7e
  24
  25 /* Write Register 0 */
  26 #define R0      0               /* Register selects */
  27 #define R1      1
  28 #define R2      2
  29 #define R3      3
  30 #define R4      4
  31 #define R5      5
  32 #define R6      6
  33 #define R7      7
  34 #define R8      8
  35 #define R9      9
  36 #define R10     10
  37 #define R11     11
  38 #define R12     12
  39 #define R13     13
  40 #define R14     14
  41 #define R15     15
  42
  43 #define RPRIME  16              /* Indicate a prime register access on 230 */
  44
  45 #define NULLCODE        0       /* Null Code */
  46 #define POINT_HIGH      0x8     /* Select upper half of registers */
  47 #define RES_EXT_INT     0x10    /* Reset Ext. Status Interrupts */
  48 #define SEND_ABORT      0x18    /* HDLC Abort */
  49 #define RES_RxINT_FC    0x20    /* Reset RxINT on First Character */
  50 #define RES_Tx_P        0x28    /* Reset TxINT Pending */
  51 #define ERR_RES         0x30    /* Error Reset */
  52 #define RES_H_IUS       0x38    /* Reset highest IUS */
  53
  54 #define RES_Rx_CRC      0x40    /* Reset Rx CRC Checker */
  55 #define RES_Tx_CRC      0x80    /* Reset Tx CRC Checker */
  56 #define RES_EOM_L       0xC0    /* Reset EOM latch */
  57
  58 /* Write Register 1 */
  59
  60 #define EXT_INT_ENAB    0x1     /* Ext Int Enable */
  61 #define TxINT_ENAB      0x2     /* Tx Int Enable */
  62 #define PAR_SPEC        0x4     /* Parity is special condition */
  63
  64 #define RxINT_DISAB     0       /* Rx Int Disable */
  65 #define RxINT_FCERR     0x8     /* Rx Int on First Character Only or Error */
  66 #define INT_ALL_Rx      0x10    /* Int on all Rx Characters or error */
  67 #define INT_ERR_Rx      0x18    /* Int on error only */
  68
  69 #define WT_RDY_RT       0x20    /* Wait/Ready on R/T */
  70 #define WT_FN_RDYFN     0x40    /* Wait/FN/Ready FN */
  71 #define WT_RDY_ENAB     0x80    /* Wait/Ready Enable */
  72
  73 /* Write Register #2 (Interrupt Vector) */
  74
  75 /* Write Register 3 */
  76
  77 #define RxENABLE        0x1     /* Rx Enable */
  78 #define SYNC_L_INH      0x2     /* Sync Character Load Inhibit */
  79 #define ADD_SM          0x4     /* Address Search Mode (SDLC) */
  80 #define RxCRC_ENAB      0x8     /* Rx CRC Enable */
  81 #define ENT_HM          0x10    /* Enter Hunt Mode */
  82 #define AUTO_ENAB       0x20    /* Auto Enables */
  83 #define Rx5             0x0     /* Rx 5 Bits/Character */
  84 #define Rx7             0x40    /* Rx 7 Bits/Character */
  85 #define Rx6             0x80    /* Rx 6 Bits/Character */
  86 #define Rx8             0xc0    /* Rx 8 Bits/Character */
  87
  88 /* Write Register 4 */
  89
  90 #define PAR_ENA         0x1     /* Parity Enable */
  91 #define PAR_EVEN        0x2     /* Parity Even/Odd* */
  92
  93 #define SYNC_ENAB       0       /* Sync Modes Enable */
  94 #define SB1             0x4     /* 1 stop bit/char */
  95 #define SB15            0x8     /* 1.5 stop bits/char */
  96 #define SB2             0xc     /* 2 stop bits/char */
  97
  98 #define MONSYNC         0       /* 8 Bit Sync character */
  99 #define BISYNC          0x10    /* 16 bit sync character */
 100 #define SDLC            0x20    /* SDLC Mode (01111110 Sync Flag) */
 101 #define EXTSYNC         0x30    /* External Sync Mode */
 102
 103 #define X1CLK           0x0     /* x1 clock mode */
 104 #define X16CLK          0x40    /* x16 clock mode */
 105 #define X32CLK          0x80    /* x32 clock mode */
 106 #define X64CLK          0xC0    /* x64 clock mode */
 107
 108 /* Write Register 5 */
 109
 110 #define TxCRC_ENAB      0x1     /* Tx CRC Enable */
 111 #define RTS             0x2     /* RTS */
 112 #define SDLC_CRC        0x4     /* SDLC/CRC-16 */
 113 #define TxENAB          0x8     /* Tx Enable */
 114 #define SND_BRK         0x10    /* Send Break */
 115 #define Tx5             0x0     /* Tx 5 bits (or less)/character */
 116 #define Tx7             0x20    /* Tx 7 bits/character */
 117 #define Tx6             0x40    /* Tx 6 bits/character */
 118 #define Tx8             0x60    /* Tx 8 bits/character */
 119 #define DTR             0x80    /* DTR */
 120
 121 /* Write Register 6 (Sync bits 0-7/SDLC Address Field) */
 122
 123 /* Write Register 7 (Sync bits 8-15/SDLC 01111110) */
 124
 125 /* Write Register 8 (transmit buffer) */
 126
 127 /* Write Register 9 (Master interrupt control) */
 128 #define VIS     1       /* Vector Includes Status */
 129 #define NV      2       /* No Vector */
 130 #define DLC     4       /* Disable Lower Chain */
 131 #define MIE     8       /* Master Interrupt Enable */
 132 #define STATHI  0x10    /* Status high */
 133 #define NORESET 0       /* No reset on write to R9 */
 134 #define CHRB    0x40    /* Reset channel B */
 135 #define CHRA    0x80    /* Reset channel A */
 136 #define FHWRES  0xc0    /* Force hardware reset */
 137
 138 /* Write Register 10 (misc control bits) */
 139 #define BIT6    1       /* 6 bit/8bit sync */
 140 #define LOOPMODE 2      /* SDLC Loop mode */
 141 #define ABUNDER 4       /* Abort/flag on SDLC xmit underrun */
 142 #define MARKIDLE 8      /* Mark/flag on idle */
 143 #define GAOP    0x10    /* Go active on poll */
 144 #define NRZ     0       /* NRZ mode */
 145 #define NRZI    0x20    /* NRZI mode */
 146 #define FM1     0x40    /* FM1 (transition = 1) */
 147 #define FM0     0x60    /* FM0 (transition = 0) */
 148 #define CRCPS   0x80    /* CRC Preset I/O */
 149
 150 /* Write Register 11 (Clock Mode control) */
 151 #define TRxCXT  0       /* TRxC = Xtal output */
 152 #define TRxCTC  1       /* TRxC = Transmit clock */
 153 #define TRxCBR  2       /* TRxC = BR Generator Output */
 154 #define TRxCDP  3       /* TRxC = DPLL output */
 155 #define TRxCOI  4       /* TRxC O/I */
 156 #define TCRTxCP 0       /* Transmit clock = RTxC pin */
 157 #define TCTRxCP 8       /* Transmit clock = TRxC pin */
 158 #define TCBR    0x10    /* Transmit clock = BR Generator output */
 159 #define TCDPLL  0x18    /* Transmit clock = DPLL output */
 160 #define RCRTxCP 0       /* Receive clock = RTxC pin */
 161 #define RCTRxCP 0x20    /* Receive clock = TRxC pin */
 162 #define RCBR    0x40    /* Receive clock = BR Generator output */
 163 #define RCDPLL  0x60    /* Receive clock = DPLL output */
 164 #define RTxCX   0x80    /* RTxC Xtal/No Xtal */
 165
 166 /* Write Register 12 (lower byte of baud rate generator time constant) */
 167
 168 /* Write Register 13 (upper byte of baud rate generator time constant) */
 169
 170 /* Write Register 14 (Misc control bits) */
 171 #define BRENABL 1       /* Baud rate generator enable */
 172 #define BRSRC   2       /* Baud rate generator source */
 173 #define DTRREQ  4       /* DTR/Request function */
 174 #define AUTOECHO 8      /* Auto Echo */
 175 #define LOOPBAK 0x10    /* Local loopback */
 176 #define SEARCH  0x20    /* Enter search mode */
 177 #define RMC     0x40    /* Reset missing clock */
 178 #define DISDPLL 0x60    /* Disable DPLL */
 179 #define SSBR    0x80    /* Set DPLL source = BR generator */
 180 #define SSRTxC  0xa0    /* Set DPLL source = RTxC */
 181 #define SFMM    0xc0    /* Set FM mode */
 182 #define SNRZI   0xe0    /* Set NRZI mode */
 183
 184 /* Write Register 15 (external/status interrupt control) */
 185 #define PRIME   1       /* R5' etc register access (Z85C30/230 only) */
 186 #define ZCIE    2       /* Zero count IE */
 187 #define FIFOE   4       /* Z85230 only */
 188 #define DCDIE   8       /* DCD IE */
 189 #define SYNCIE  0x10    /* Sync/hunt IE */
 190 #define CTSIE   0x20    /* CTS IE */
 191 #define TxUIE   0x40    /* Tx Underrun/EOM IE */
 192 #define BRKIE   0x80    /* Break/Abort IE */
 193
 194
 195 /* Read Register 0 */
 196 #define Rx_CH_AV        0x1     /* Rx Character Available */
 197 #define ZCOUNT          0x2     /* Zero count */
 198 #define Tx_BUF_EMP      0x4     /* Tx Buffer empty */
 199 #define DCD             0x8     /* DCD */
 200 #define SYNC_HUNT       0x10    /* Sync/hunt */
 201 #define CTS             0x20    /* CTS */
 202 #define TxEOM           0x40    /* Tx underrun */
 203 #define BRK_ABRT        0x80    /* Break/Abort */
 204
 205 /* Read Register 1 */
 206 #define ALL_SNT         0x1     /* All sent */
 207 /* Residue Data for 8 Rx bits/char programmed */
 208 #define RES3            0x8     /* 0/3 */
 209 #define RES4            0x4     /* 0/4 */
 210 #define RES5            0xc     /* 0/5 */
 211 #define RES6            0x2     /* 0/6 */
 212 #define RES7            0xa     /* 0/7 */
 213 #define RES8            0x6     /* 0/8 */
 214 #define RES18           0xe     /* 1/8 */
 215 #define RES28           0x0     /* 2/8 */
 216 /* Special Rx Condition Interrupts */
 217 #define PAR_ERR         0x10    /* Parity error */
 218 #define Rx_OVR          0x20    /* Rx Overrun Error */
 219 #define CRC_ERR         0x40    /* CRC/Framing Error */
 220 #define END_FR          0x80    /* End of Frame (SDLC) */
 221
 222 /* Read Register 2 (channel b only) - Interrupt vector */
 223
 224 /* Read Register 3 (interrupt pending register) ch a only */
 225 #define CHBEXT  0x1             /* Channel B Ext/Stat IP */
 226 #define CHBTxIP 0x2             /* Channel B Tx IP */
 227 #define CHBRxIP 0x4             /* Channel B Rx IP */
 228 #define CHAEXT  0x8             /* Channel A Ext/Stat IP */
 229 #define CHATxIP 0x10            /* Channel A Tx IP */
 230 #define CHARxIP 0x20            /* Channel A Rx IP */
 231
 232 /* Read Register 8 (receive data register) */
 233
 234 /* Read Register 10  (misc status bits) */
 235 #define ONLOOP  2               /* On loop */
 236 #define LOOPSEND 0x10           /* Loop sending */
 237 #define CLK2MIS 0x40            /* Two clocks missing */
 238 #define CLK1MIS 0x80            /* One clock missing */
 239
 240 /* Read Register 12 (lower byte of baud rate generator constant) */
 241
 242 /* Read Register 13 (upper byte of baud rate generator constant) */
 243
 244 /* Read Register 15 (value of WR 15) */
 245
 246
 247 /*
 248  *      Interrupt handling functions for this SCC
 249  */
 250
 251 struct z8530_channel;
 252
 253 struct z8530_irqhandler
 254 {
 255         void (*rx)(struct z8530_channel *);
 256         void (*tx)(struct z8530_channel *);
 257         void (*status)(struct z8530_channel *);
 258 };
 259
 260 /*
 261  *      A channel of the Z8530
 262  */
 263
 264 struct z8530_channel
 265 {
 266         struct          z8530_irqhandler *irqs;         /* IRQ handlers */
 267         /*
 268          *      Synchronous
 269          */
 270         u16             count;          /* Buyes received */
 271         u16             max;            /* Most we can receive this frame */
 272         u16             mtu;            /* MTU of the device */
 273         u8              *dptr;          /* Pointer into rx buffer */
 274         struct sk_buff  *skb;           /* Buffer dptr points into */
 275         struct sk_buff  *skb2;          /* Pending buffer */
 276         u8              status;         /* Current DCD */
 277         u8              dcdcheck;       /* which bit to check for line */
 278         u8              sync;           /* Set if in sync mode */
 279
 280         u8              regs[32];       /* Register map for the chip */
 281         u8              pendregs[32];   /* Pending register values */
 282
 283         struct sk_buff  *tx_skb;        /* Buffer being transmitted */
 284         struct sk_buff  *tx_next_skb;   /* Next transmit buffer */
 285         u8              *tx_ptr;        /* Byte pointer into the buffer */
 286         u8              *tx_next_ptr;   /* Next pointer to use */
 287         u8              *tx_dma_buf[2]; /* TX flip buffers for DMA */
 288         u8              tx_dma_used;    /* Flip buffer usage toggler */
 289         u16             txcount;        /* Count of bytes to transmit */
 290
 291         void            (*rx_function)(struct z8530_channel *, struct sk_buff *);
 292
 293         /*
 294          *      Sync DMA
 295          */
 296
 297         u8              rxdma;          /* DMA channels */
 298         u8              txdma;
 299         u8              rxdma_on;       /* DMA active if flag set */
 300         u8              txdma_on;
 301         u8              dma_num;        /* Buffer we are DMAing into */
 302         u8              dma_ready;      /* Is the other buffer free */
 303         u8              dma_tx;         /* TX is to use DMA */
 304         u8              *rx_buf[2];     /* The flip buffers */
 305
 306         /*
 307          *      System
 308          */
 309
 310         struct z8530_dev *dev;          /* Z85230 chip instance we are from */
 311         unsigned long   ctrlio;         /* I/O ports */
 312         unsigned long   dataio;
 313
 314         /*
 315          *      For PC we encode this way.
 316          */
 317 #define Z8530_PORT_SLEEP        0x80000000
 318 #define Z8530_PORT_OF(x)        ((x)&0xFFFF)
 319
 320         u32             rx_overrun;             /* Overruns - not done yet */
 321         u32             rx_crc_err;
 322
 323         /*
 324          *      Bound device pointers
 325          */
 326
 327         void            *private;       /* For our owner */
 328         struct net_device       *netdevice;     /* Network layer device */
 329
 330         /*
 331          *      Async features
 332          */
 333
 334         struct tty_struct       *tty;           /* Attached terminal */
 335         int                     line;           /* Minor number */
 336         wait_queue_head_t       open_wait;      /* Tasks waiting to open */
 337         wait_queue_head_t       close_wait;     /* and for close to end */
 338         unsigned long           event;          /* Pending events */
 339         int                     fdcount;        /* # of fd on device */
 340         int                     blocked_open;   /* # of blocked opens */
 341         int                     x_char;         /* XON/XOF char */
 342         unsigned char           *xmit_buf;      /* Transmit pointer */
 343         int                     xmit_head;      /* Transmit ring */
 344         int                     xmit_tail;
 345         int                     xmit_cnt;
 346         int                     flags;
 347         int                     timeout;
 348         int                     xmit_fifo_size; /* Transmit FIFO info */
 349
 350         int                     close_delay;    /* Do we wait for drain on close ? */
 351         unsigned short          closing_wait;
 352
 353         /* We need to know the current clock divisor
 354          * to read the bps rate the chip has currently
 355          * loaded.
 356          */
 357
 358         unsigned char           clk_divisor;  /* May be 1, 16, 32, or 64 */
 359         int                     zs_baud;
 360
 361         int                     magic;
 362         int                     baud_base;              /* Baud parameters */
 363         int                     custom_divisor;
 364
 365
 366         unsigned char           tx_active; /* character is being xmitted */
 367         unsigned char           tx_stopped; /* output is suspended */
 368
 369         spinlock_t              *lock;    /* Device lock */
 370 };
 371
 372 /*
 373  *      Each Z853x0 device.
 374  */
 375
 376 struct z8530_dev
 377 {
 378         char *name;     /* Device instance name */
 379         struct z8530_channel chanA;     /* SCC channel A */
 380         struct z8530_channel chanB;     /* SCC channel B */
 381         int type;
 382 #define Z8530   0       /* NMOS dinosaur */
 383 #define Z85C30  1       /* CMOS - better */
 384 #define Z85230  2       /* CMOS with real FIFO */
 385         int irq;        /* Interrupt for the device */
 386         int active;     /* Soft interrupt enable - the Mac doesn't
 387                            always have a hard disable on its 8530s... */
 388         spinlock_t lock;
 389 };
 390
 391
 392 /*
 393  *      Functions
 394  */
 395
 396 extern u8 z8530_dead_port[];
 397 extern u8 z8530_hdlc_kilostream_85230[];
 398 extern u8 z8530_hdlc_kilostream[];
 399 irqreturn_t z8530_interrupt(int, void *);
 400 void z8530_describe(struct z8530_dev *, char *mapping, unsigned long io);
 401 int z8530_init(struct z8530_dev *);
 402 int z8530_shutdown(struct z8530_dev *);
 403 int z8530_sync_open(struct net_device *, struct z8530_channel *);
 404 int z8530_sync_close(struct net_device *, struct z8530_channel *);
 405 int z8530_sync_dma_open(struct net_device *, struct z8530_channel *);
 406 int z8530_sync_dma_close(struct net_device *, struct z8530_channel *);
 407 int z8530_sync_txdma_open(struct net_device *, struct z8530_channel *);
 408 int z8530_sync_txdma_close(struct net_device *, struct z8530_channel *);
 409 int z8530_channel_load(struct z8530_channel *, u8 *);
 410 netdev_tx_t z8530_queue_xmit(struct z8530_channel *c, struct sk_buff *skb);
 411 void z8530_null_rx(struct z8530_channel *c, struct sk_buff *skb);
 412
 413
 414 /*
 415  *      Standard interrupt vector sets
 416  */
 417
 418 extern struct z8530_irqhandler z8530_sync, z8530_async, z8530_nop;
 419
 420 /*
 421  *      Asynchronous Interfacing
 422  */
 423
 424 /*
 425  * The size of the serial xmit buffer is 1 page, or 4096 bytes
 426  */
 427
 428 #define SERIAL_XMIT_SIZE 4096
 429 #define WAKEUP_CHARS    256
 430
 431 /*
 432  * Events are used to schedule things to happen at timer-interrupt
 433  * time, instead of at rs interrupt time.
 434  */
 435 #define RS_EVENT_WRITE_WAKEUP   0
 436
 437 /* Internal flags used only by kernel/chr_drv/serial.c */
 438 #define ZILOG_INITIALIZED       0x80000000 /* Serial port was initialized */
 439 #define ZILOG_CALLOUT_ACTIVE    0x40000000 /* Call out device is active */
 440 #define ZILOG_NORMAL_ACTIVE     0x20000000 /* Normal device is active */
 441 #define ZILOG_BOOT_AUTOCONF     0x10000000 /* Autoconfigure port on bootup */
 442 #define ZILOG_CLOSING           0x08000000 /* Serial port is closing */
 443 #define ZILOG_CTS_FLOW          0x04000000 /* Do CTS flow control */
 444 #define ZILOG_CHECK_CD          0x02000000 /* i.e., CLOCAL */
 445
 446 #endif /* !(_Z8530_H) */