1 | /* $ZEL: sis1100_read_loop.c,v 1.3 2004/05/27 23:10:32 wuestner Exp $ */
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2 |
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3 | /*
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4 | * Copyright (c) 2003-2004
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5 | * Peter Wuestner. All rights reserved.
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6 | *
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7 | * Redistribution and use in source and binary forms, with or without
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8 | * modification, are permitted provided that the following conditions
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9 | * are met:
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10 | * 1. Redistributions of source code must retain the above copyright
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11 | * notice, this list of conditions, and the following disclaimer.
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12 | * 2. Redistributions in binary form must reproduce the above copyright
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13 | * notice, this list of conditions and the following disclaimer in the
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14 | * documentation and/or other materials provided with the distribution.
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15 | *
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16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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26 | * SUCH DAMAGE.
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27 | */
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28 |
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29 | #include "sis1100_sc.h"
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30 |
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31 | /*
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32 | * sis1100_read_loop always transports data directly to userspace!
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33 | * Access permissions have to be checked before.
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34 | */
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35 |
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36 | ssize_t
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37 | sis1100_read_loop(
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38 | struct sis1100_softc* sc,
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39 | struct sis1100_fdata* fd,
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40 | u_int32_t addr, /* VME or SDRAM address */
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41 | int32_t am, /* address modifier, not used if <0 */
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42 | int size, /* datasize (bytes/word) */
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43 | int space, /* remote space (1,2: VME; 6: SDRAM) */
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44 | int fifo_mode,
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45 | size_t count, /* words (of size 'size') to be transferred */
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46 | /* count==0 is illegal */
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47 | size_t* count_read, /* words transferred */
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48 | u_int8_t* data, /* destination (user virtual address) */
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49 | int* prot_error
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50 | )
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51 | {
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52 | u_int32_t head;
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53 | int idx, res=0;
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54 |
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55 | *count_read=count;
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56 | head=0x00000002|(space&0x3f)<<16;
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57 | SEM_LOCK(sc->sem_hw);
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58 | if (am>=0) {
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59 | head|=0x800;
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60 | sis1100writereg(sc, t_am, am);
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61 | }
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62 | switch (size) {
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63 | case 1:
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64 | for (idx=0; idx<count; idx++, data++) {
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65 | u_int32_t val;
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66 | sis1100writereg(sc, t_hdr, head|(0x01000000<<(addr&3)));
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67 | sis1100writereg(sc, t_adl, addr);
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68 | do {
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69 | *prot_error=sis1100readreg(sc, prot_error);
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70 | } while (*prot_error==0x005);
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71 | if (*prot_error) {
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72 | *count_read=idx;
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73 | break;
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74 | }
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75 | val=sis1100rawreadreg(sc, tc_dal);
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76 | #ifdef __NetBSD__
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77 | #if defined(__LITTLE_ENDIAN)
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78 | subyte(data, (val>>((addr&3)<<3))&0xff);
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79 | #else
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80 | subyte(data, (val>>((3-(addr&3))<<3))&0xff);
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81 | #endif
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82 | #elif __linux__
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83 | #if defined(__LITTLE_ENDIAN)
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84 | __put_user((val>>((addr&3)<<3))&0xff, (u_int8_t*)(data));
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85 | #else
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86 | __put_user((val>>((3-(addr&3))<<3))&0xff, (u_int8_t*)(data));
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87 | #endif
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88 | #endif
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89 | if (!fifo_mode) addr++;
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90 | }
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91 | break;
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92 | case 2:
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93 | for (idx=0; idx<count; idx++, data+=2) {
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94 | u_int32_t val;
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95 | sis1100writereg(sc, t_hdr, head|(0x03000000<<(addr&3)));
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96 | sis1100writereg(sc, t_adl, addr);
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97 | do {
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98 | *prot_error=sis1100readreg(sc, prot_error);
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99 | } while (*prot_error==0x005);
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100 | if (*prot_error) {
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101 | /*
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102 | pINFO(sc, "read_loop(2): addr=%x prot_error=%x idx=%d",
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103 | addr, *prot_error, idx);
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104 | */
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105 | *count_read=idx;
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106 | break;
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107 | }
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108 | val=sis1100rawreadreg(sc, tc_dal);
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109 | /*
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110 | pINFO(sc, "read_loop: head=%08x addr=%x idx=%d val=%08x",
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111 | head|(0x03000000<<(addr&3)), addr, idx, val);
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112 | */
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113 | #ifdef __NetBSD__
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114 | #if defined(__LITTLE_ENDIAN)
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115 | susword(data, (val>>((addr&2)<<3))&0xffff);
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116 | #else
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117 | susword(data, (val>>((2-(addr&2))<<3))&0xffff);
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118 | #endif
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119 | #elif __linux__
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120 | #if defined(__LITTLE_ENDIAN)
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121 | __put_user((val>>((addr&2)<<3))&0xffff, (u_int16_t*)data);
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122 | #else
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123 | __put_user((val>>((2-(addr&2))<<3))&0xffff, (u_int16_t*)data);
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124 | #endif
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125 | #endif
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126 | if (!fifo_mode) addr+=2;
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127 | }
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128 | break;
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129 | case 4:
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130 | sis1100writereg(sc, t_hdr, head|0x0f000000);
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131 | for (idx=0; idx<count; idx++, data+=4) {
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132 | u_int32_t val;
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133 | sis1100writereg(sc, t_adl, addr);
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134 | do {
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135 | *prot_error=sis1100readreg(sc, prot_error);
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136 | } while (*prot_error==0x005);
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137 | if (*prot_error) {
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138 | *count_read=idx;
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139 | break;
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140 | }
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141 | val=sis1100rawreadreg(sc, tc_dal);
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142 | #ifdef __NetBSD__
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143 | suword(data, val);
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144 | #elif __linux__
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145 | __put_user(val, (u_int32_t*)data);
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146 | #endif
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147 | if (!fifo_mode) addr+=4;
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148 | }
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149 | break;
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150 | }
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151 | SEM_UNLOCK(sc->sem_hw);
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152 | /*
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153 | pINFO(sc, "read_loop(am=%x size=%d count=%d count_read=%d, addr=%x): res=%d",
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154 | am, size, count, *count_read, addr, res);
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155 | */
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156 | return res;
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157 | }
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