1 | /* AHB Status register driver |
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2 | * |
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3 | * COPYRIGHT (c) 2009. |
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4 | * Cobham Gaisler AB. |
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5 | * |
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6 | * The license and distribution terms for this file may be |
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7 | * found in the file LICENSE in this distribution or at |
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8 | * http://www.rtems.org/license/LICENSE. |
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9 | */ |
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10 | |
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11 | #include <stdint.h> |
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12 | #include <drvmgr/drvmgr.h> |
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13 | #include <drvmgr/ambapp_bus.h> |
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14 | |
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15 | #include <bsp/ahbstat.h> |
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16 | #include <rtems/bspIo.h> |
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17 | |
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18 | void ahbstat_isr(void *arg); |
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19 | |
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20 | /* AHB fail interrupt callback to user. This function is declared weak so that |
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21 | * the user can define a function pointer variable containing the address |
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22 | * responsible for handling errors |
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23 | * |
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24 | * minor Index of AHBSTAT hardware |
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25 | * regs Register address of AHBSTAT |
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26 | * status AHBSTAT status register at IRQ |
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27 | * failing_address AHBSTAT Failing address register at IRQ |
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28 | * |
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29 | * * User return |
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30 | * 0: print error onto terminal with printk and reenable AHBSTAT |
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31 | * 1: just re-enable AHBSTAT |
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32 | * 2: just print error |
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33 | * 3: do nothing, let user do custom handling |
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34 | */ |
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35 | int (*ahbstat_error)( |
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36 | int minor, |
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37 | struct ahbstat_regs *regs, |
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38 | uint32_t status, |
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39 | uint32_t failing_address |
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40 | ) __attribute__((weak)) = NULL; |
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41 | |
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42 | #define AHBSTAT_STS_CE_BIT 9 |
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43 | #define AHBSTAT_STS_NE_BIT 8 |
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44 | #define AHBSTAT_STS_HW_BIT 7 |
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45 | #define AHBSTAT_STS_HM_BIT 3 |
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46 | #define AHBSTAT_STS_HS_BIT 0 |
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47 | |
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48 | #define AHBSTAT_STS_CE (1 << AHBSTAT_STS_CE_BIT) |
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49 | #define AHBSTAT_STS_NE (1 << AHBSTAT_STS_NE_BIT) |
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50 | #define AHBSTAT_STS_HW (1 << AHBSTAT_STS_HW_BIT) |
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51 | #define AHBSTAT_STS_HM (0xf << AHBSTAT_STS_HM_BIT) |
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52 | #define AHBSTAT_STS_HS (0x7 << AHBSTAT_STS_HS_BIT) |
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53 | |
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54 | struct ahbstat_priv { |
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55 | struct drvmgr_dev *dev; |
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56 | struct ahbstat_regs *regs; |
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57 | int minor; |
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58 | uint32_t last_status; |
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59 | uint32_t last_address; |
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60 | }; |
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61 | |
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62 | static int ahbstat_init2(struct drvmgr_dev *dev); |
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63 | |
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64 | struct drvmgr_drv_ops ahbstat_ops = |
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65 | { |
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66 | .init = {NULL, ahbstat_init2, NULL, NULL}, |
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67 | .remove = NULL, |
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68 | .info = NULL |
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69 | }; |
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70 | |
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71 | struct amba_dev_id ahbstat_ids[] = |
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72 | { |
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73 | {VENDOR_GAISLER, GAISLER_AHBSTAT}, |
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74 | {0, 0} /* Mark end of table */ |
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75 | }; |
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76 | |
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77 | struct amba_drv_info ahbstat_drv_info = |
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78 | { |
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79 | { |
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80 | DRVMGR_OBJ_DRV, /* Driver */ |
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81 | NULL, /* Next driver */ |
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82 | NULL, /* Device list */ |
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83 | DRIVER_AMBAPP_GAISLER_AHBSTAT_ID,/* Driver ID */ |
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84 | "AHBSTAT_DRV", /* Driver Name */ |
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85 | DRVMGR_BUS_TYPE_AMBAPP, /* Bus Type */ |
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86 | &ahbstat_ops, |
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87 | NULL, /* Funcs */ |
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88 | 0, /* No devices yet */ |
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89 | sizeof(struct ahbstat_priv), |
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90 | }, |
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91 | &ahbstat_ids[0] |
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92 | }; |
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93 | |
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94 | void ahbstat_register_drv (void) |
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95 | { |
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96 | drvmgr_drv_register(&ahbstat_drv_info.general); |
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97 | } |
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98 | |
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99 | static int ahbstat_init2(struct drvmgr_dev *dev) |
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100 | { |
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101 | struct ahbstat_priv *priv; |
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102 | struct amba_dev_info *ambadev; |
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103 | |
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104 | priv = dev->priv; |
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105 | if (!priv) |
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106 | return DRVMGR_NOMEM; |
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107 | priv->dev = dev; |
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108 | |
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109 | /* Get device information from AMBA PnP information */ |
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110 | ambadev = (struct amba_dev_info *)dev->businfo; |
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111 | if (ambadev == NULL) |
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112 | return DRVMGR_FAIL; |
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113 | priv->regs = (struct ahbstat_regs *)ambadev->info.apb_slv->start; |
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114 | priv->minor = dev->minor_drv; |
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115 | |
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116 | /* Initialize hardware */ |
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117 | priv->regs->status = 0; |
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118 | |
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119 | /* Install IRQ handler */ |
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120 | drvmgr_interrupt_register(dev, 0, "ahbstat", ahbstat_isr, priv); |
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121 | |
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122 | return DRVMGR_OK; |
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123 | } |
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124 | |
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125 | void ahbstat_isr(void *arg) |
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126 | { |
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127 | struct ahbstat_priv *priv = arg; |
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128 | uint32_t fadr, status; |
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129 | int rc; |
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130 | |
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131 | /* Get hardware status */ |
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132 | status = priv->regs->status; |
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133 | if ((status & AHBSTAT_STS_NE) == 0) |
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134 | return; |
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135 | |
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136 | /* IRQ generated by AHBSTAT core... handle it here */ |
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137 | |
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138 | /* Get Failing address */ |
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139 | fadr = priv->regs->failing; |
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140 | |
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141 | priv->last_status = status; |
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142 | priv->last_address = fadr; |
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143 | |
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144 | /* Let user handle error, default to print the error and reenable HW |
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145 | * |
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146 | * User return |
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147 | * 0: print error and reenable AHBSTAT |
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148 | * 1: just reenable AHBSTAT |
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149 | * 2: just print error reenable |
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150 | * 3: do nothing |
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151 | */ |
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152 | rc = 0; |
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153 | if (ahbstat_error != NULL) |
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154 | rc = ahbstat_error(priv->minor, priv->regs, status, fadr); |
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155 | |
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156 | if ((rc & 0x1) == 0) { |
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157 | printk("\n### AHBSTAT: %s %s error of size %lu by master %d" |
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158 | " at 0x%08lx\n", |
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159 | status & AHBSTAT_STS_CE ? "single" : "non-correctable", |
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160 | status & AHBSTAT_STS_HW ? "write" : "read", |
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161 | (status & AHBSTAT_STS_HS) >> AHBSTAT_STS_HS_BIT, |
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162 | (status & AHBSTAT_STS_HM) >> AHBSTAT_STS_HM_BIT, |
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163 | fadr); |
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164 | } |
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165 | |
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166 | if ((rc & 0x2) == 0) { |
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167 | /* Trigger new interrupts */ |
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168 | priv->regs->status = 0; |
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169 | } |
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170 | } |
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171 | |
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172 | /* Get Last received AHB Error |
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173 | * |
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174 | * Return |
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175 | * 0: No error received |
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176 | * 1: Error Received, last status and address stored into argument pointers |
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177 | * -1: No such AHBSTAT device |
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178 | */ |
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179 | int ahbstat_last_error(int minor, uint32_t *status, uint32_t *address) |
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180 | { |
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181 | struct drvmgr_dev *dev; |
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182 | struct ahbstat_priv *priv; |
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183 | |
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184 | if (drvmgr_get_dev(&ahbstat_drv_info.general, minor, &dev)) { |
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185 | return -1; |
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186 | } |
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187 | priv = (struct ahbstat_priv *)dev->priv; |
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188 | |
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189 | *status = priv->last_status; |
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190 | *address = priv->last_address; |
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191 | |
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192 | return (priv->last_status & AHBSTAT_STS_NE) >> AHBSTAT_STS_NE_BIT; |
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193 | } |
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194 | |
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195 | /* Get AHBSTAT registers address from minor. NULL returned if no such device */ |
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196 | struct ahbstat_regs *ahbstat_get_regs(int minor) |
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197 | { |
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198 | struct drvmgr_dev *dev; |
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199 | struct ahbstat_priv *priv; |
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200 | |
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201 | if (drvmgr_get_dev(&ahbstat_drv_info.general, minor, &dev)) { |
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202 | return NULL; |
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203 | } |
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204 | priv = (struct ahbstat_priv *)dev->priv; |
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205 | |
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206 | return priv->regs; |
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207 | } |
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