drivers/serial/sunzilog.h

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