drivers/staging/sbe-2t3e3/exar7300.c

   1 /*
   2  * SBE 2T3E3 synchronous serial card driver for Linux
   3  *
   4  * Copyright (C) 2009-2010 Krzysztof Halasa <khc@pm.waw.pl>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License
   8  * as published by the Free Software Foundation.
   9  *
  10  * This code is based on a driver written by SBE Inc.
  11  */
  12
  13 #include "2t3e3.h"
  14 #include "ctrl.h"
  15
  16 void exar7300_init(struct channel *sc)
  17 {
  18         exar7300_write(sc, SBE_2T3E3_LIU_REG_REG1, 0);
  19
  20         /* enable line decodeer and encoder */
  21         exar7300_write(sc, SBE_2T3E3_LIU_REG_REG2, 0);
  22         exar7300_write(sc, SBE_2T3E3_LIU_REG_REG3, 0);
  23         exar7300_write(sc, SBE_2T3E3_LIU_REG_REG4,
  24                        SBE_2T3E3_LIU_VAL_T3_MODE_SELECT |
  25                        SBE_2T3E3_LIU_VAL_LOOPBACK_OFF);
  26 }
  27
  28 void exar7300_set_loopback(struct channel *sc, u32 mode)
  29 {
  30         u32 val;
  31
  32         switch (mode) {
  33         case SBE_2T3E3_LIU_VAL_LOOPBACK_OFF:
  34         case SBE_2T3E3_LIU_VAL_LOOPBACK_REMOTE:
  35         case SBE_2T3E3_LIU_VAL_LOOPBACK_ANALOG:
  36         case SBE_2T3E3_LIU_VAL_LOOPBACK_DIGITAL:
  37                 break;
  38         default:
  39                 return;
  40         }
  41
  42         val = exar7300_read(sc, SBE_2T3E3_LIU_REG_REG4);
  43         val &= ~(SBE_2T3E3_LIU_VAL_LOCAL_LOOPBACK | SBE_2T3E3_LIU_VAL_REMOTE_LOOPBACK);
  44         val |= mode;
  45         exar7300_write(sc, SBE_2T3E3_LIU_REG_REG4, val);
  46
  47 #if 0
  48         /* TODO - is it necessary? idea from 2T3E3_HW_Test_code */
  49         switch (mode) {
  50         case SBE_2T3E3_LIU_VAL_LOOPBACK_OFF:
  51                 break;
  52         case SBE_2T3E3_LIU_VAL_LOOPBACK_REMOTE:
  53                 exar7300_receive_equalization_onoff(sc, SBE_2T3E3_ON);
  54                 break;
  55         case SBE_2T3E3_LIU_VAL_LOOPBACK_ANALOG:
  56                 exar7300_receive_equalization_onoff(sc, SBE_2T3E3_OFF);
  57                 break;
  58         case SBE_2T3E3_LIU_VAL_LOOPBACK_DIGITAL:
  59                 exar7300_receive_equalization_onoff(sc, SBE_2T3E3_ON);
  60                 break;
  61         }
  62 #endif
  63 }
  64
  65 void exar7300_set_frame_type(struct channel *sc, u32 type)
  66 {
  67         u32 val;
  68
  69         switch (type) {
  70         case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
  71         case SBE_2T3E3_FRAME_TYPE_T3_M13:
  72         case SBE_2T3E3_FRAME_TYPE_E3_G751:
  73         case SBE_2T3E3_FRAME_TYPE_E3_G832:
  74                 break;
  75         default:
  76                 return;
  77         }
  78
  79         val = exar7300_read(sc, SBE_2T3E3_LIU_REG_REG4);
  80         val &= ~(SBE_2T3E3_LIU_VAL_T3_MODE_SELECT |
  81                  SBE_2T3E3_LIU_VAL_E3_MODE_SELECT);
  82
  83         switch (type) {
  84         case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
  85         case SBE_2T3E3_FRAME_TYPE_T3_M13:
  86                 val |= SBE_2T3E3_LIU_VAL_T3_MODE_SELECT;
  87                 break;
  88         case SBE_2T3E3_FRAME_TYPE_E3_G751:
  89         case SBE_2T3E3_FRAME_TYPE_E3_G832:
  90                 val |= SBE_2T3E3_LIU_VAL_E3_MODE_SELECT;
  91                 break;
  92         default:
  93                 return;
  94         }
  95
  96         exar7300_write(sc, SBE_2T3E3_LIU_REG_REG4, val);
  97 }
  98
  99
 100 void exar7300_transmit_all_ones_onoff(struct channel *sc, u32 mode)
 101 {
 102         if (sc->p.transmit_all_ones == mode)
 103                 return;
 104
 105         switch (mode) {
 106         case SBE_2T3E3_ON:
 107                 exar7300_set_bit(sc, SBE_2T3E3_LIU_REG_REG1,
 108                                  SBE_2T3E3_LIU_VAL_TRANSMIT_ALL_ONES);
 109                 break;
 110         case SBE_2T3E3_OFF:
 111                 exar7300_clear_bit(sc, SBE_2T3E3_LIU_REG_REG1,
 112                                    SBE_2T3E3_LIU_VAL_TRANSMIT_ALL_ONES);
 113                 break;
 114         default:
 115                 return;
 116         }
 117
 118         sc->p.transmit_all_ones = mode;
 119 }
 120
 121 void exar7300_receive_equalization_onoff(struct channel *sc, u32 mode)
 122 {
 123         if (sc->p.receive_equalization == mode)
 124                 return;
 125
 126         switch (mode) {
 127         case SBE_2T3E3_OFF:
 128                 exar7300_set_bit(sc, SBE_2T3E3_LIU_REG_REG2,
 129                                  SBE_2T3E3_LIU_VAL_RECEIVE_EQUALIZATION_DISABLE);
 130                 break;
 131         case SBE_2T3E3_ON:
 132                 exar7300_clear_bit(sc, SBE_2T3E3_LIU_REG_REG2,
 133                                    SBE_2T3E3_LIU_VAL_RECEIVE_EQUALIZATION_DISABLE);
 134                 break;
 135         default:
 136                 return;
 137         }
 138
 139         sc->p.receive_equalization = mode;
 140 }
 141
 142 void exar7300_line_build_out_onoff(struct channel *sc, u32 mode)
 143 {
 144         if (sc->p.line_build_out == mode)
 145                 return;
 146
 147         switch (mode) {
 148         case SBE_2T3E3_OFF:
 149                 exar7300_set_bit(sc, SBE_2T3E3_LIU_REG_REG1,
 150                                  SBE_2T3E3_LIU_VAL_TRANSMIT_LEVEL_SELECT);
 151                 exar7300_receive_equalization_onoff(sc, SBE_2T3E3_OFF);
 152                 break;
 153         case SBE_2T3E3_ON:
 154                 exar7300_clear_bit(sc, SBE_2T3E3_LIU_REG_REG1,
 155                                    SBE_2T3E3_LIU_VAL_TRANSMIT_LEVEL_SELECT);
 156                 exar7300_receive_equalization_onoff(sc, SBE_2T3E3_ON);
 157                 break;
 158         default:
 159                 return;
 160         }
 161
 162         sc->p.line_build_out = mode;
 163 }
 164
 165 /* TODO - what about encoder in raw mode??? disable it too? */
 166 void exar7300_unipolar_onoff(struct channel *sc, u32 mode)
 167 {
 168         switch (mode) {
 169         case SBE_2T3E3_OFF:
 170                 exar7300_clear_bit(sc, SBE_2T3E3_LIU_REG_REG3,
 171                                    SBE_2T3E3_LIU_VAL_DECODER_DISABLE);
 172                 exar7300_clear_bit(sc, SBE_2T3E3_LIU_REG_REG1,
 173                                    SBE_2T3E3_LIU_VAL_TRANSMIT_BINARY_DATA);
 174                 break;
 175         case SBE_2T3E3_ON:
 176                 exar7300_set_bit(sc, SBE_2T3E3_LIU_REG_REG3,
 177                                  SBE_2T3E3_LIU_VAL_DECODER_DISABLE);
 178                 exar7300_set_bit(sc, SBE_2T3E3_LIU_REG_REG1,
 179                                  SBE_2T3E3_LIU_VAL_TRANSMIT_BINARY_DATA);
 180                 break;
 181         }
 182 }