drivers/tty/serial/sunzilog.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _SUNZILOG_H
   3 #define _SUNZILOG_H
   4
   5 struct zilog_channel {
   6         volatile unsigned char control;
   7         volatile unsigned char __pad1;
   8         volatile unsigned char data;
   9         volatile unsigned char __pad2;
  10 };
  11
  12 struct zilog_layout {
  13         struct zilog_channel channelB;
  14         struct zilog_channel channelA;
  15 };
  16
  17 #define NUM_ZSREGS      17
  18 #define R7p             16 /* Written as R7 with P15 bit 0 set */
  19
  20 /* Conversion routines to/from brg time constants from/to bits
  21  * per second.
  22  */
  23 #define BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
  24 #define BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)
  25
  26 /* The Zilog register set */
  27
  28 #define FLAG    0x7e
  29
  30 /* Write Register 0 */
  31 #define R0      0               /* Register selects */
  32 #define R1      1
  33 #define R2      2
  34 #define R3      3
  35 #define R4      4
  36 #define R5      5
  37 #define R6      6
  38 #define R7      7
  39 #define R8      8
  40 #define R9      9
  41 #define R10     10
  42 #define R11     11
  43 #define R12     12
  44 #define R13     13
  45 #define R14     14
  46 #define R15     15
  47
  48 #define NULLCODE        0       /* Null Code */
  49 #define POINT_HIGH      0x8     /* Select upper half of registers */
  50 #define RES_EXT_INT     0x10    /* Reset Ext. Status Interrupts */
  51 #define SEND_ABORT      0x18    /* HDLC Abort */
  52 #define RES_RxINT_FC    0x20    /* Reset RxINT on First Character */
  53 #define RES_Tx_P        0x28    /* Reset TxINT Pending */
  54 #define ERR_RES         0x30    /* Error Reset */
  55 #define RES_H_IUS       0x38    /* Reset highest IUS */
  56
  57 #define RES_Rx_CRC      0x40    /* Reset Rx CRC Checker */
  58 #define RES_Tx_CRC      0x80    /* Reset Tx CRC Checker */
  59 #define RES_EOM_L       0xC0    /* Reset EOM latch */
  60
  61 /* Write Register 1 */
  62
  63 #define EXT_INT_ENAB    0x1     /* Ext Int Enable */
  64 #define TxINT_ENAB      0x2     /* Tx Int Enable */
  65 #define PAR_SPEC        0x4     /* Parity is special condition */
  66
  67 #define RxINT_DISAB     0       /* Rx Int Disable */
  68 #define RxINT_FCERR     0x8     /* Rx Int on First Character Only or Error */
  69 #define INT_ALL_Rx      0x10    /* Int on all Rx Characters or error */
  70 #define INT_ERR_Rx      0x18    /* Int on error only */
  71 #define RxINT_MASK      0x18
  72
  73 #define WT_RDY_RT       0x20    /* Wait/Ready on R/T */
  74 #define WT_FN_RDYFN     0x40    /* Wait/FN/Ready FN */
  75 #define WT_RDY_ENAB     0x80    /* Wait/Ready Enable */
  76
  77 /* Write Register #2 (Interrupt Vector) */
  78
  79 /* Write Register 3 */
  80
  81 #define RxENAB          0x1     /* Rx Enable */
  82 #define SYNC_L_INH      0x2     /* Sync Character Load Inhibit */
  83 #define ADD_SM          0x4     /* Address Search Mode (SDLC) */
  84 #define RxCRC_ENAB      0x8     /* Rx CRC Enable */
  85 #define ENT_HM          0x10    /* Enter Hunt Mode */
  86 #define AUTO_ENAB       0x20    /* Auto Enables */
  87 #define Rx5             0x0     /* Rx 5 Bits/Character */
  88 #define Rx7             0x40    /* Rx 7 Bits/Character */
  89 #define Rx6             0x80    /* Rx 6 Bits/Character */
  90 #define Rx8             0xc0    /* Rx 8 Bits/Character */
  91 #define RxN_MASK        0xc0
  92
  93 /* Write Register 4 */
  94
  95 #define PAR_ENAB        0x1     /* Parity Enable */
  96 #define PAR_EVEN        0x2     /* Parity Even/Odd* */
  97
  98 #define SYNC_ENAB       0       /* Sync Modes Enable */
  99 #define SB1             0x4     /* 1 stop bit/char */
 100 #define SB15            0x8     /* 1.5 stop bits/char */
 101 #define SB2             0xc     /* 2 stop bits/char */
 102
 103 #define MONSYNC         0       /* 8 Bit Sync character */
 104 #define BISYNC          0x10    /* 16 bit sync character */
 105 #define SDLC            0x20    /* SDLC Mode (01111110 Sync Flag) */
 106 #define EXTSYNC         0x30    /* External Sync Mode */
 107
 108 #define X1CLK           0x0     /* x1 clock mode */
 109 #define X16CLK          0x40    /* x16 clock mode */
 110 #define X32CLK          0x80    /* x32 clock mode */
 111 #define X64CLK          0xC0    /* x64 clock mode */
 112 #define XCLK_MASK       0xC0
 113
 114 /* Write Register 5 */
 115
 116 #define TxCRC_ENAB      0x1     /* Tx CRC Enable */
 117 #define RTS             0x2     /* RTS */
 118 #define SDLC_CRC        0x4     /* SDLC/CRC-16 */
 119 #define TxENAB          0x8     /* Tx Enable */
 120 #define SND_BRK         0x10    /* Send Break */
 121 #define Tx5             0x0     /* Tx 5 bits (or less)/character */
 122 #define Tx7             0x20    /* Tx 7 bits/character */
 123 #define Tx6             0x40    /* Tx 6 bits/character */
 124 #define Tx8             0x60    /* Tx 8 bits/character */
 125 #define TxN_MASK        0x60
 126 #define DTR             0x80    /* DTR */
 127
 128 /* Write Register 6 (Sync bits 0-7/SDLC Address Field) */
 129
 130 /* Write Register 7 (Sync bits 8-15/SDLC 01111110) */
 131
 132 /* Write Register 7' (ESCC Only) */
 133 #define AUTO_TxFLAG     1       /* Automatic Tx SDLC Flag */
 134 #define AUTO_EOM_RST    2       /* Automatic EOM Reset */
 135 #define AUTOnRTS        4       /* Automatic /RTS pin deactivation */
 136 #define RxFIFO_LVL      8       /* Receive FIFO interrupt level */
 137 #define nDTRnREQ        0x10    /* /DTR/REQ timing */
 138 #define TxFIFO_LVL      0x20    /* Transmit FIFO interrupt level */
 139 #define EXT_RD_EN       0x40    /* Extended read register enable */
 140
 141 /* Write Register 8 (transmit buffer) */
 142
 143 /* Write Register 9 (Master interrupt control) */
 144 #define VIS     1       /* Vector Includes Status */
 145 #define NV      2       /* No Vector */
 146 #define DLC     4       /* Disable Lower Chain */
 147 #define MIE     8       /* Master Interrupt Enable */
 148 #define STATHI  0x10    /* Status high */
 149 #define SWIACK  0x20    /* Software Interrupt Ack (not on NMOS) */
 150 #define NORESET 0       /* No reset on write to R9 */
 151 #define CHRB    0x40    /* Reset channel B */
 152 #define CHRA    0x80    /* Reset channel A */
 153 #define FHWRES  0xc0    /* Force hardware reset */
 154
 155 /* Write Register 10 (misc control bits) */
 156 #define BIT6    1       /* 6 bit/8bit sync */
 157 #define LOOPMODE 2      /* SDLC Loop mode */
 158 #define ABUNDER 4       /* Abort/flag on SDLC xmit underrun */
 159 #define MARKIDLE 8      /* Mark/flag on idle */
 160 #define GAOP    0x10    /* Go active on poll */
 161 #define NRZ     0       /* NRZ mode */
 162 #define NRZI    0x20    /* NRZI mode */
 163 #define FM1     0x40    /* FM1 (transition = 1) */
 164 #define FM0     0x60    /* FM0 (transition = 0) */
 165 #define CRCPS   0x80    /* CRC Preset I/O */
 166
 167 /* Write Register 11 (Clock Mode control) */
 168 #define TRxCXT  0       /* TRxC = Xtal output */
 169 #define TRxCTC  1       /* TRxC = Transmit clock */
 170 #define TRxCBR  2       /* TRxC = BR Generator Output */
 171 #define TRxCDP  3       /* TRxC = DPLL output */
 172 #define TRxCOI  4       /* TRxC O/I */
 173 #define TCRTxCP 0       /* Transmit clock = RTxC pin */
 174 #define TCTRxCP 8       /* Transmit clock = TRxC pin */
 175 #define TCBR    0x10    /* Transmit clock = BR Generator output */
 176 #define TCDPLL  0x18    /* Transmit clock = DPLL output */
 177 #define RCRTxCP 0       /* Receive clock = RTxC pin */
 178 #define RCTRxCP 0x20    /* Receive clock = TRxC pin */
 179 #define RCBR    0x40    /* Receive clock = BR Generator output */
 180 #define RCDPLL  0x60    /* Receive clock = DPLL output */
 181 #define RTxCX   0x80    /* RTxC Xtal/No Xtal */
 182
 183 /* Write Register 12 (lower byte of baud rate generator time constant) */
 184
 185 /* Write Register 13 (upper byte of baud rate generator time constant) */
 186
 187 /* Write Register 14 (Misc control bits) */
 188 #define BRENAB  1       /* Baud rate generator enable */
 189 #define BRSRC   2       /* Baud rate generator source */
 190 #define DTRREQ  4       /* DTR/Request function */
 191 #define AUTOECHO 8      /* Auto Echo */
 192 #define LOOPBAK 0x10    /* Local loopback */
 193 #define SEARCH  0x20    /* Enter search mode */
 194 #define RMC     0x40    /* Reset missing clock */
 195 #define DISDPLL 0x60    /* Disable DPLL */
 196 #define SSBR    0x80    /* Set DPLL source = BR generator */
 197 #define SSRTxC  0xa0    /* Set DPLL source = RTxC */
 198 #define SFMM    0xc0    /* Set FM mode */
 199 #define SNRZI   0xe0    /* Set NRZI mode */
 200
 201 /* Write Register 15 (external/status interrupt control) */
 202 #define WR7pEN  1       /* WR7' Enable (ESCC only) */
 203 #define ZCIE    2       /* Zero count IE */
 204 #define FIFOEN  4       /* FIFO Enable (ESCC only) */
 205 #define DCDIE   8       /* DCD IE */
 206 #define SYNCIE  0x10    /* Sync/hunt IE */
 207 #define CTSIE   0x20    /* CTS IE */
 208 #define TxUIE   0x40    /* Tx Underrun/EOM IE */
 209 #define BRKIE   0x80    /* Break/Abort IE */
 210
 211
 212 /* Read Register 0 */
 213 #define Rx_CH_AV        0x1     /* Rx Character Available */
 214 #define ZCOUNT          0x2     /* Zero count */
 215 #define Tx_BUF_EMP      0x4     /* Tx Buffer empty */
 216 #define DCD             0x8     /* DCD */
 217 #define SYNC            0x10    /* Sync/hunt */
 218 #define CTS             0x20    /* CTS */
 219 #define TxEOM           0x40    /* Tx underrun */
 220 #define BRK_ABRT        0x80    /* Break/Abort */
 221
 222 /* Read Register 1 */
 223 #define ALL_SNT         0x1     /* All sent */
 224 /* Residue Data for 8 Rx bits/char programmed */
 225 #define RES3            0x8     /* 0/3 */
 226 #define RES4            0x4     /* 0/4 */
 227 #define RES5            0xc     /* 0/5 */
 228 #define RES6            0x2     /* 0/6 */
 229 #define RES7            0xa     /* 0/7 */
 230 #define RES8            0x6     /* 0/8 */
 231 #define RES18           0xe     /* 1/8 */
 232 #define RES28           0x0     /* 2/8 */
 233 /* Special Rx Condition Interrupts */
 234 #define PAR_ERR         0x10    /* Parity error */
 235 #define Rx_OVR          0x20    /* Rx Overrun Error */
 236 #define CRC_ERR         0x40    /* CRC/Framing Error */
 237 #define END_FR          0x80    /* End of Frame (SDLC) */
 238
 239 /* Read Register 2 (channel b only) - Interrupt vector */
 240 #define CHB_Tx_EMPTY    0x00
 241 #define CHB_EXT_STAT    0x02
 242 #define CHB_Rx_AVAIL    0x04
 243 #define CHB_SPECIAL     0x06
 244 #define CHA_Tx_EMPTY    0x08
 245 #define CHA_EXT_STAT    0x0a
 246 #define CHA_Rx_AVAIL    0x0c
 247 #define CHA_SPECIAL     0x0e
 248 #define STATUS_MASK     0x0e
 249
 250 /* Read Register 3 (interrupt pending register) ch a only */
 251 #define CHBEXT  0x1             /* Channel B Ext/Stat IP */
 252 #define CHBTxIP 0x2             /* Channel B Tx IP */
 253 #define CHBRxIP 0x4             /* Channel B Rx IP */
 254 #define CHAEXT  0x8             /* Channel A Ext/Stat IP */
 255 #define CHATxIP 0x10            /* Channel A Tx IP */
 256 #define CHARxIP 0x20            /* Channel A Rx IP */
 257
 258 /* Read Register 6 (LSB frame byte count [Not on NMOS]) */
 259
 260 /* Read Register 7 (MSB frame byte count and FIFO status [Not on NMOS]) */
 261
 262 /* Read Register 8 (receive data register) */
 263
 264 /* Read Register 10  (misc status bits) */
 265 #define ONLOOP  2               /* On loop */
 266 #define LOOPSEND 0x10           /* Loop sending */
 267 #define CLK2MIS 0x40            /* Two clocks missing */
 268 #define CLK1MIS 0x80            /* One clock missing */
 269
 270 /* Read Register 12 (lower byte of baud rate generator constant) */
 271
 272 /* Read Register 13 (upper byte of baud rate generator constant) */
 273
 274 /* Read Register 15 (value of WR 15) */
 275
 276 /* Misc macros */
 277 #define ZS_CLEARERR(channel)    do { sbus_writeb(ERR_RES, &channel->control); \
 278                                      udelay(5); } while(0)
 279
 280 #define ZS_CLEARSTAT(channel)   do { sbus_writeb(RES_EXT_INT, &channel->control); \
 281                                      udelay(5); } while(0)
 282
 283 #define ZS_CLEARFIFO(channel)   do { sbus_readb(&channel->data); \
 284                                      udelay(2); \
 285                                      sbus_readb(&channel->data); \
 286                                      udelay(2); \
 287                                      sbus_readb(&channel->data); \
 288                                      udelay(2); } while(0)
 289
 290 #endif /* _SUNZILOG_H */