drivers/staging/sbe-2t3e3/exar7250.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 exar7250_init(struct channel *sc)
  17 {
  18         exar7250_write(sc, SBE_2T3E3_FRAMER_REG_OPERATING_MODE,
  19                        SBE_2T3E3_FRAMER_VAL_T3_CBIT |
  20                        SBE_2T3E3_FRAMER_VAL_INTERRUPT_ENABLE_RESET |
  21                        SBE_2T3E3_FRAMER_VAL_TIMING_ASYNCH_TXINCLK);
  22
  23         exar7250_write(sc, SBE_2T3E3_FRAMER_REG_IO_CONTROL,
  24                        SBE_2T3E3_FRAMER_VAL_DISABLE_TX_LOSS_OF_CLOCK |
  25                        SBE_2T3E3_FRAMER_VAL_DISABLE_RX_LOSS_OF_CLOCK |
  26                        SBE_2T3E3_FRAMER_VAL_AMI_LINE_CODE |
  27                        SBE_2T3E3_FRAMER_VAL_RX_LINE_CLOCK_INVERT);
  28
  29         exar7250_set_frame_type(sc, SBE_2T3E3_FRAME_TYPE_T3_CBIT);
  30 }
  31
  32 void exar7250_set_frame_type(struct channel *sc, u32 type)
  33 {
  34         u32 val;
  35
  36         switch (type) {
  37         case SBE_2T3E3_FRAME_TYPE_E3_G751:
  38         case SBE_2T3E3_FRAME_TYPE_E3_G832:
  39         case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
  40         case SBE_2T3E3_FRAME_TYPE_T3_M13:
  41                 break;
  42         default:
  43                 return;
  44         }
  45
  46         exar7250_stop_intr(sc, type);
  47
  48         val = exar7250_read(sc, SBE_2T3E3_FRAMER_REG_OPERATING_MODE);
  49         val &= ~(SBE_2T3E3_FRAMER_VAL_LOCAL_LOOPBACK_MODE |
  50                  SBE_2T3E3_FRAMER_VAL_T3_E3_SELECT |
  51                  SBE_2T3E3_FRAMER_VAL_FRAME_FORMAT_SELECT);
  52         switch (type) {
  53         case SBE_2T3E3_FRAME_TYPE_E3_G751:
  54                 val |= SBE_2T3E3_FRAMER_VAL_E3_G751;
  55                 break;
  56         case SBE_2T3E3_FRAME_TYPE_E3_G832:
  57                 val |= SBE_2T3E3_FRAMER_VAL_E3_G832;
  58                 break;
  59         case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
  60                 val |= SBE_2T3E3_FRAMER_VAL_T3_CBIT;
  61                 break;
  62         case SBE_2T3E3_FRAME_TYPE_T3_M13:
  63                 val |= SBE_2T3E3_FRAMER_VAL_T3_M13;
  64                 break;
  65         default:
  66                 return;
  67         }
  68         exar7250_write(sc, SBE_2T3E3_FRAMER_REG_OPERATING_MODE, val);
  69         exar7250_start_intr(sc, type);
  70 }
  71
  72
  73 void exar7250_start_intr(struct channel *sc, u32 type)
  74 {
  75         u32 val;
  76
  77         switch (type) {
  78         case SBE_2T3E3_FRAME_TYPE_E3_G751:
  79         case SBE_2T3E3_FRAME_TYPE_E3_G832:
  80                 val = exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_CONFIGURATION_STATUS_2);
  81
  82                 cpld_LOS_update(sc);
  83
  84                 sc->s.OOF = val & SBE_2T3E3_FRAMER_VAL_E3_RX_OOF ? 1 : 0;
  85                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_STATUS_1);
  86                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_ENABLE_1,
  87                                SBE_2T3E3_FRAMER_VAL_E3_RX_OOF_INTERRUPT_ENABLE |
  88                                SBE_2T3E3_FRAMER_VAL_E3_RX_LOS_INTERRUPT_ENABLE);
  89
  90                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_STATUS_2);
  91                 break;
  92
  93         case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
  94         case SBE_2T3E3_FRAME_TYPE_T3_M13:
  95                 val = exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_CONFIGURATION_STATUS);
  96
  97                 cpld_LOS_update(sc);
  98
  99                 sc->s.OOF = val & SBE_2T3E3_FRAMER_VAL_T3_RX_OOF ? 1 : 0;
 100
 101                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_INTERRUPT_STATUS);
 102                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_RX_INTERRUPT_ENABLE,
 103                                SBE_2T3E3_FRAMER_VAL_T3_RX_LOS_INTERRUPT_ENABLE |
 104                                SBE_2T3E3_FRAMER_VAL_T3_RX_OOF_INTERRUPT_ENABLE);
 105
 106                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_FEAC_INTERRUPT_ENABLE_STATUS);
 107
 108                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_RX_LAPD_CONTROL, 0);
 109                 break;
 110
 111         default:
 112                 return;
 113         }
 114
 115         exar7250_read(sc, SBE_2T3E3_FRAMER_REG_BLOCK_INTERRUPT_STATUS);
 116         exar7250_write(sc, SBE_2T3E3_FRAMER_REG_BLOCK_INTERRUPT_ENABLE,
 117                        SBE_2T3E3_FRAMER_VAL_RX_INTERRUPT_ENABLE |
 118                        SBE_2T3E3_FRAMER_VAL_TX_INTERRUPT_ENABLE);
 119 }
 120
 121
 122 void exar7250_stop_intr(struct channel *sc, u32 type)
 123 {
 124         exar7250_write(sc, SBE_2T3E3_FRAMER_REG_BLOCK_INTERRUPT_ENABLE, 0);
 125         exar7250_read(sc, SBE_2T3E3_FRAMER_REG_BLOCK_INTERRUPT_STATUS);
 126
 127         switch (type) {
 128         case SBE_2T3E3_FRAME_TYPE_E3_G751:
 129         case SBE_2T3E3_FRAME_TYPE_E3_G832:
 130                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_ENABLE_1, 0);
 131                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_STATUS_1);
 132                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_ENABLE_2, 0);
 133                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_STATUS_2);
 134                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_E3_RX_LAPD_CONTROL, 0);
 135                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_LAPD_CONTROL);
 136                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_E3_TX_LAPD_STATUS, 0);
 137                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_TX_LAPD_STATUS);
 138                 break;
 139
 140         case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
 141         case SBE_2T3E3_FRAME_TYPE_T3_M13:
 142                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_RX_INTERRUPT_ENABLE, 0);
 143                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_INTERRUPT_STATUS);
 144                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_RX_FEAC_INTERRUPT_ENABLE_STATUS, 0);
 145                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_FEAC_INTERRUPT_ENABLE_STATUS);
 146                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_RX_LAPD_CONTROL, 0);
 147                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_LAPD_CONTROL);
 148                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_TX_FEAC_CONFIGURATION_STATUS, 0);
 149                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_TX_FEAC_CONFIGURATION_STATUS);
 150                 exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_TX_LAPD_STATUS, 0);
 151                 exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_TX_LAPD_STATUS);
 152                 break;
 153         }
 154 }
 155
 156
 157
 158
 159 void exar7250_unipolar_onoff(struct channel *sc, u32 mode)
 160 {
 161         switch (mode) {
 162         case SBE_2T3E3_OFF:
 163                 exar7300_clear_bit(sc, SBE_2T3E3_FRAMER_REG_IO_CONTROL,
 164                                    SBE_2T3E3_FRAMER_VAL_UNIPOLAR);
 165                 break;
 166         case SBE_2T3E3_ON:
 167                 exar7300_set_bit(sc, SBE_2T3E3_FRAMER_REG_IO_CONTROL,
 168                                  SBE_2T3E3_FRAMER_VAL_UNIPOLAR);
 169                 break;
 170         }
 171 }
 172
 173 void exar7250_set_loopback(struct channel *sc, u32 mode)
 174 {
 175         switch (mode) {
 176         case SBE_2T3E3_FRAMER_VAL_LOOPBACK_OFF:
 177                 exar7300_clear_bit(sc, SBE_2T3E3_FRAMER_REG_OPERATING_MODE,
 178                                    SBE_2T3E3_FRAMER_VAL_LOCAL_LOOPBACK_MODE);
 179                 break;
 180         case SBE_2T3E3_FRAMER_VAL_LOOPBACK_ON:
 181                 exar7300_set_bit(sc, SBE_2T3E3_FRAMER_REG_OPERATING_MODE,
 182                                  SBE_2T3E3_FRAMER_VAL_LOCAL_LOOPBACK_MODE);
 183                 break;
 184         }
 185 }