drivers/net/ethernet/realtek/atp.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* Linux header file for the ATP pocket ethernet adapter. */
   3 /* v1.09 8/9/2000 becker@scyld.com. */
   4
   5 #include <linux/if_ether.h>
   6 #include <linux/types.h>
   7
   8 /* The header prepended to received packets. */
   9 struct rx_header {
  10         ushort pad;             /* Pad. */
  11         ushort rx_count;
  12         ushort rx_status;       /* Unknown bit assignments :-<.  */
  13         ushort cur_addr;        /* Apparently the current buffer address(?) */
  14 };
  15
  16 #define PAR_DATA        0
  17 #define PAR_STATUS      1
  18 #define PAR_CONTROL 2
  19
  20 #define Ctrl_LNibRead   0x08    /* LP_PSELECP */
  21 #define Ctrl_HNibRead   0
  22 #define Ctrl_LNibWrite  0x08    /* LP_PSELECP */
  23 #define Ctrl_HNibWrite  0
  24 #define Ctrl_SelData    0x04    /* LP_PINITP */
  25 #define Ctrl_IRQEN      0x10    /* LP_PINTEN */
  26
  27 #define EOW     0xE0
  28 #define EOC     0xE0
  29 #define WrAddr  0x40    /* Set address of EPLC read, write register. */
  30 #define RdAddr  0xC0
  31 #define HNib    0x10
  32
  33 enum page0_regs {
  34         /* The first six registers hold
  35          * the ethernet physical station address.
  36          */
  37         PAR0 = 0, PAR1 = 1, PAR2 = 2, PAR3 = 3, PAR4 = 4, PAR5 = 5,
  38         TxCNT0 = 6, TxCNT1 = 7,         /* The transmit byte count. */
  39         TxSTAT = 8, RxSTAT = 9,         /* Tx and Rx status. */
  40         ISR = 10, IMR = 11,             /* Interrupt status and mask. */
  41         CMR1 = 12,                      /* Command register 1. */
  42         CMR2 = 13,                      /* Command register 2. */
  43         MODSEL = 14,            /* Mode select register. */
  44         MAR = 14,                       /* Memory address register (?). */
  45         CMR2_h = 0x1d,
  46 };
  47
  48 enum eepage_regs {
  49         PROM_CMD = 6,
  50         PROM_DATA = 7   /* Note that PROM_CMD is in the "high" bits. */
  51 };
  52
  53 #define ISR_TxOK        0x01
  54 #define ISR_RxOK        0x04
  55 #define ISR_TxErr       0x02
  56 #define ISRh_RxErr      0x11    /* ISR, high nibble */
  57
  58 #define CMR1h_MUX       0x08    /* Select printer multiplexor on 8012. */
  59 #define CMR1h_RESET     0x04    /* Reset. */
  60 #define CMR1h_RxENABLE  0x02    /* Rx unit enable.  */
  61 #define CMR1h_TxENABLE  0x01    /* Tx unit enable.  */
  62 #define CMR1h_TxRxOFF   0x00
  63 #define CMR1_ReXmit     0x08    /* Trigger a retransmit. */
  64 #define CMR1_Xmit       0x04    /* Trigger a transmit. */
  65 #define CMR1_IRQ        0x02    /* Interrupt active. */
  66 #define CMR1_BufEnb     0x01    /* Enable the buffer(?). */
  67 #define CMR1_NextPkt    0x01    /* Enable the buffer(?). */
  68
  69 #define CMR2_NULL       8
  70 #define CMR2_IRQOUT     9
  71 #define CMR2_RAMTEST    10
  72 #define CMR2_EEPROM     12      /* Set to page 1, for reading the EEPROM. */
  73
  74 #define CMR2h_OFF       0       /* No accept mode. */
  75 #define CMR2h_Physical  1       /* Accept a physical address match only. */
  76 #define CMR2h_Normal    2       /* Accept physical and broadcast address. */
  77 #define CMR2h_PROMISC   3       /* Promiscuous mode. */
  78
  79 /* An inline function used below: it differs from inb() by explicitly
  80  * return an unsigned char, saving a truncation.
  81  */
  82 static inline unsigned char inbyte(unsigned short port)
  83 {
  84         unsigned char _v;
  85
  86         __asm__ __volatile__ ("inb %w1,%b0" : "=a" (_v) : "d" (port));
  87         return _v;
  88 }
  89
  90 /* Read register OFFSET.
  91  * This command should always be terminated with read_end().
  92  */
  93 static inline unsigned char read_nibble(short port, unsigned char offset)
  94 {
  95         unsigned char retval;
  96
  97         outb(EOC+offset, port + PAR_DATA);
  98         outb(RdAddr+offset, port + PAR_DATA);
  99         inbyte(port + PAR_STATUS);      /* Settling time delay */
 100         retval = inbyte(port + PAR_STATUS);
 101         outb(EOC+offset, port + PAR_DATA);
 102
 103         return retval;
 104 }
 105
 106 /* Functions for bulk data read.  The interrupt line is always disabled. */
 107 /* Get a byte using read mode 0, reading data from the control lines. */
 108 static inline unsigned char read_byte_mode0(short ioaddr)
 109 {
 110         unsigned char low_nib;
 111
 112         outb(Ctrl_LNibRead, ioaddr + PAR_CONTROL);
 113         inbyte(ioaddr + PAR_STATUS);
 114         low_nib = (inbyte(ioaddr + PAR_STATUS) >> 3) & 0x0f;
 115         outb(Ctrl_HNibRead, ioaddr + PAR_CONTROL);
 116         inbyte(ioaddr + PAR_STATUS);    /* Settling time delay -- needed!  */
 117         inbyte(ioaddr + PAR_STATUS);    /* Settling time delay -- needed!  */
 118         return low_nib | ((inbyte(ioaddr + PAR_STATUS) << 1) & 0xf0);
 119 }
 120
 121 /* The same as read_byte_mode0(), but does multiple inb()s for stability. */
 122 static inline unsigned char read_byte_mode2(short ioaddr)
 123 {
 124         unsigned char low_nib;
 125
 126         outb(Ctrl_LNibRead, ioaddr + PAR_CONTROL);
 127         inbyte(ioaddr + PAR_STATUS);
 128         low_nib = (inbyte(ioaddr + PAR_STATUS) >> 3) & 0x0f;
 129         outb(Ctrl_HNibRead, ioaddr + PAR_CONTROL);
 130         inbyte(ioaddr + PAR_STATUS);    /* Settling time delay -- needed!  */
 131         return low_nib | ((inbyte(ioaddr + PAR_STATUS) << 1) & 0xf0);
 132 }
 133
 134 /* Read a byte through the data register. */
 135 static inline unsigned char read_byte_mode4(short ioaddr)
 136 {
 137         unsigned char low_nib;
 138
 139         outb(RdAddr | MAR, ioaddr + PAR_DATA);
 140         low_nib = (inbyte(ioaddr + PAR_STATUS) >> 3) & 0x0f;
 141         outb(RdAddr | HNib | MAR, ioaddr + PAR_DATA);
 142         return low_nib | ((inbyte(ioaddr + PAR_STATUS) << 1) & 0xf0);
 143 }
 144
 145 /* Read a byte through the data register, double reading to allow settling. */
 146 static inline unsigned char read_byte_mode6(short ioaddr)
 147 {
 148         unsigned char low_nib;
 149
 150         outb(RdAddr | MAR, ioaddr + PAR_DATA);
 151         inbyte(ioaddr + PAR_STATUS);
 152         low_nib = (inbyte(ioaddr + PAR_STATUS) >> 3) & 0x0f;
 153         outb(RdAddr | HNib | MAR, ioaddr + PAR_DATA);
 154         inbyte(ioaddr + PAR_STATUS);
 155         return low_nib | ((inbyte(ioaddr + PAR_STATUS) << 1) & 0xf0);
 156 }
 157
 158 static inline void
 159 write_reg(short port, unsigned char reg, unsigned char value)
 160 {
 161         unsigned char outval;
 162
 163         outb(EOC | reg, port + PAR_DATA);
 164         outval = WrAddr | reg;
 165         outb(outval, port + PAR_DATA);
 166         outb(outval, port + PAR_DATA);  /* Double write for PS/2. */
 167
 168         outval &= 0xf0;
 169         outval |= value;
 170         outb(outval, port + PAR_DATA);
 171         outval &= 0x1f;
 172         outb(outval, port + PAR_DATA);
 173         outb(outval, port + PAR_DATA);
 174
 175         outb(EOC | outval, port + PAR_DATA);
 176 }
 177
 178 static inline void
 179 write_reg_high(short port, unsigned char reg, unsigned char value)
 180 {
 181         unsigned char outval = EOC | HNib | reg;
 182
 183         outb(outval, port + PAR_DATA);
 184         outval &= WrAddr | HNib | 0x0f;
 185         outb(outval, port + PAR_DATA);
 186         outb(outval, port + PAR_DATA);  /* Double write for PS/2. */
 187
 188         outval = WrAddr | HNib | value;
 189         outb(outval, port + PAR_DATA);
 190         outval &= HNib | 0x0f;          /* HNib | value */
 191         outb(outval, port + PAR_DATA);
 192         outb(outval, port + PAR_DATA);
 193
 194         outb(EOC | HNib | outval, port + PAR_DATA);
 195 }
 196
 197 /* Write a byte out using nibble mode.  The low nibble is written first. */
 198 static inline void
 199 write_reg_byte(short port, unsigned char reg, unsigned char value)
 200 {
 201         unsigned char outval;
 202
 203         outb(EOC | reg, port + PAR_DATA); /* Reset the address register. */
 204         outval = WrAddr | reg;
 205         outb(outval, port + PAR_DATA);
 206         outb(outval, port + PAR_DATA);  /* Double write for PS/2. */
 207
 208         outb((outval & 0xf0) | (value & 0x0f), port + PAR_DATA);
 209         outb(value & 0x0f, port + PAR_DATA);
 210         value >>= 4;
 211         outb(value, port + PAR_DATA);
 212         outb(0x10 | value, port + PAR_DATA);
 213         outb(0x10 | value, port + PAR_DATA);
 214
 215         outb(EOC  | value, port + PAR_DATA); /* Reset the address register. */
 216 }
 217
 218 /* Bulk data writes to the packet buffer.  The interrupt line remains enabled.
 219  * The first, faster method uses only the dataport (data modes 0, 2 & 4).
 220  * The second (backup) method uses data and control regs (modes 1, 3 & 5).
 221  * It should only be needed when there is skew between the individual data
 222  * lines.
 223  */
 224 static inline void write_byte_mode0(short ioaddr, unsigned char value)
 225 {
 226         outb(value & 0x0f, ioaddr + PAR_DATA);
 227         outb((value>>4) | 0x10, ioaddr + PAR_DATA);
 228 }
 229
 230 static inline void write_byte_mode1(short ioaddr, unsigned char value)
 231 {
 232         outb(value & 0x0f, ioaddr + PAR_DATA);
 233         outb(Ctrl_IRQEN | Ctrl_LNibWrite, ioaddr + PAR_CONTROL);
 234         outb((value>>4) | 0x10, ioaddr + PAR_DATA);
 235         outb(Ctrl_IRQEN | Ctrl_HNibWrite, ioaddr + PAR_CONTROL);
 236 }
 237
 238 /* Write 16bit VALUE to the packet buffer: the same as above just doubled. */
 239 static inline void write_word_mode0(short ioaddr, unsigned short value)
 240 {
 241         outb(value & 0x0f, ioaddr + PAR_DATA);
 242         value >>= 4;
 243         outb((value & 0x0f) | 0x10, ioaddr + PAR_DATA);
 244         value >>= 4;
 245         outb(value & 0x0f, ioaddr + PAR_DATA);
 246         value >>= 4;
 247         outb((value & 0x0f) | 0x10, ioaddr + PAR_DATA);
 248 }
 249
 250 /*  EEPROM_Ctrl bits. */
 251 #define EE_SHIFT_CLK    0x04    /* EEPROM shift clock. */
 252 #define EE_CS           0x02    /* EEPROM chip select. */
 253 #define EE_CLK_HIGH     0x12
 254 #define EE_CLK_LOW      0x16
 255 #define EE_DATA_WRITE   0x01    /* EEPROM chip data in. */
 256 #define EE_DATA_READ    0x08    /* EEPROM chip data out. */
 257
 258 /* The EEPROM commands include the alway-set leading bit. */
 259 #define EE_WRITE_CMD(offset)    (((5 << 6) + (offset)) << 17)
 260 #define EE_READ(offset)         (((6 << 6) + (offset)) << 17)
 261 #define EE_ERASE(offset)        (((7 << 6) + (offset)) << 17)
 262 #define EE_CMD_SIZE     27      /* The command+address+data size. */