1 | /*
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2 | * Copyright (c) 2014 Jiri Svoboda
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | *
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9 | * - Redistributions of source code must retain the above copyright
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10 | * notice, this list of conditions and the following disclaimer.
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11 | * - Redistributions in binary form must reproduce the above copyright
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12 | * notice, this list of conditions and the following disclaimer in the
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13 | * documentation and/or other materials provided with the distribution.
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14 | * - The name of the author may not be used to endorse or promote products
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15 | * derived from this software without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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27 | */
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28 |
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29 | /** @addtogroup icp-ic
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30 | * @{
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31 | */
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32 |
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33 | /**
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34 | * @file icp-ic.c
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35 | * @brief IntegratorCP interrupt controller driver
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36 | */
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37 |
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38 | #include <async.h>
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39 | #include <bitops.h>
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40 | #include <ddi.h>
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41 | #include <ddf/log.h>
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42 | #include <errno.h>
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43 | #include <str_error.h>
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44 | #include <ipc/irc.h>
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45 | #include <stdint.h>
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46 |
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47 | #include "icp-ic.h"
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48 | #include "icp-ic_hw.h"
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49 |
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50 | enum {
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51 | icpic_max_irq = 32
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52 | };
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53 |
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54 | static errno_t icpic_enable_irq(icpic_t *icpic, sysarg_t irq)
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55 | {
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56 | if (irq > icpic_max_irq)
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57 | return EINVAL;
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58 |
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59 | ddf_msg(LVL_NOTE, "Enable IRQ %zu", irq);
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60 |
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61 | pio_write_32(&icpic->regs->irq_enableset, BIT_V(uint32_t, irq));
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62 | return EOK;
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63 | }
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64 |
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65 | /** Client connection handler.
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66 | *
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67 | * @param icall Call data of the request that opened the connection.
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68 | * @param arg Local argument.
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69 | *
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70 | */
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71 | static void icpic_connection(ipc_call_t *icall, void *arg)
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72 | {
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73 | ipc_call_t call;
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74 | icpic_t *icpic;
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75 |
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76 | /*
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77 | * Answer the first IPC_M_CONNECT_ME_TO call.
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78 | */
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79 | async_accept_0(icall);
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80 |
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81 | icpic = (icpic_t *) ddf_dev_data_get(ddf_fun_get_dev((ddf_fun_t *) arg));
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82 |
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83 | while (true) {
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84 | async_get_call(&call);
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85 |
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86 | if (!ipc_get_imethod(&call)) {
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87 | /* The other side has hung up. */
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88 | async_answer_0(&call, EOK);
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89 | return;
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90 | }
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91 |
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92 | switch (ipc_get_imethod(&call)) {
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93 | case IRC_ENABLE_INTERRUPT:
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94 | async_answer_0(&call,
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95 | icpic_enable_irq(icpic, ipc_get_arg1(&call)));
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96 | break;
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97 | case IRC_DISABLE_INTERRUPT:
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98 | /* XXX TODO */
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99 | async_answer_0(&call, EOK);
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100 | break;
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101 | case IRC_CLEAR_INTERRUPT:
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102 | /* Noop */
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103 | async_answer_0(&call, EOK);
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104 | break;
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105 | default:
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106 | async_answer_0(&call, EINVAL);
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107 | break;
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108 | }
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109 | }
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110 | }
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111 |
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112 | /** Add icp-ic device. */
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113 | errno_t icpic_add(icpic_t *icpic, icpic_res_t *res)
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114 | {
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115 | ddf_fun_t *fun_a = NULL;
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116 | void *regs;
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117 | errno_t rc;
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118 | bool bound = false;
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119 |
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120 | rc = pio_enable((void *)res->base, sizeof(icpic_regs_t), ®s);
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121 | if (rc != EOK) {
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122 | ddf_msg(LVL_ERROR, "Error enabling PIO");
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123 | goto error;
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124 | }
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125 |
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126 | icpic->regs = (icpic_regs_t *)regs;
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127 |
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128 | fun_a = ddf_fun_create(icpic->dev, fun_exposed, "a");
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129 | if (fun_a == NULL) {
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130 | ddf_msg(LVL_ERROR, "Failed creating function 'a'.");
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131 | rc = ENOMEM;
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132 | goto error;
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133 | }
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134 |
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135 | ddf_fun_set_conn_handler(fun_a, icpic_connection);
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136 |
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137 | rc = ddf_fun_bind(fun_a);
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138 | if (rc != EOK) {
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139 | ddf_msg(LVL_ERROR, "Failed binding function 'a': %s", str_error(rc));
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140 | goto error;
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141 | }
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142 |
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143 | rc = ddf_fun_add_to_category(fun_a, "irc");
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144 | if (rc != EOK)
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145 | goto error;
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146 |
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147 | return EOK;
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148 | error:
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149 | if (bound)
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150 | ddf_fun_unbind(fun_a);
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151 | if (fun_a != NULL)
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152 | ddf_fun_destroy(fun_a);
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153 | return rc;
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154 | }
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155 |
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156 | /** Remove icp-ic device */
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157 | errno_t icpic_remove(icpic_t *icpic)
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158 | {
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159 | return ENOTSUP;
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160 | }
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161 |
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162 | /** icp-ic device gone */
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163 | errno_t icpic_gone(icpic_t *icpic)
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164 | {
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165 | return ENOTSUP;
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166 | }
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167 |
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168 | /**
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169 | * @}
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170 | */
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