OpenWrt – Blame information for rev 1
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Rev | Author | Line No. | Line |
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1 | office | 1 | /* |
2 | * B53 register access through memory mapped registers |
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3 | * |
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4 | * Copyright (C) 2012-2013 Jonas Gorski <jogo@openwrt.org> |
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5 | * |
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6 | * Permission to use, copy, modify, and/or distribute this software for any |
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7 | * purpose with or without fee is hereby granted, provided that the above |
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8 | * copyright notice and this permission notice appear in all copies. |
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9 | * |
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10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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17 | */ |
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18 | |||
19 | #include <linux/kernel.h> |
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20 | #include <linux/module.h> |
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21 | #include <linux/platform_device.h> |
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22 | #include <linux/platform_data/b53.h> |
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23 | |||
24 | #include "b53_priv.h" |
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25 | |||
26 | static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val) |
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27 | { |
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28 | u8 __iomem *regs = dev->priv; |
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29 | |||
30 | *val = readb(regs + (page << 8) + reg); |
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31 | |||
32 | return 0; |
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33 | } |
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34 | |||
35 | static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val) |
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36 | { |
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37 | u8 __iomem *regs = dev->priv; |
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38 | |||
39 | if (WARN_ON(reg % 2)) |
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40 | return -EINVAL; |
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41 | |||
42 | if (dev->pdata && dev->pdata->big_endian) |
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43 | *val = readw_be(regs + (page << 8) + reg); |
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44 | else |
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45 | *val = readw(regs + (page << 8) + reg); |
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46 | |||
47 | return 0; |
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48 | } |
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49 | |||
50 | static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val) |
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51 | { |
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52 | u8 __iomem *regs = dev->priv; |
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53 | |||
54 | if (WARN_ON(reg % 4)) |
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55 | return -EINVAL; |
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56 | |||
57 | if (dev->pdata && dev->pdata->big_endian) |
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58 | *val = readl_be(regs + (page << 8) + reg); |
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59 | else |
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60 | *val = readl(regs + (page << 8) + reg); |
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61 | |||
62 | return 0; |
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63 | } |
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64 | |||
65 | static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val) |
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66 | { |
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67 | if (WARN_ON(reg % 2)) |
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68 | return -EINVAL; |
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69 | |||
70 | if (reg % 4) { |
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71 | u16 lo; |
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72 | u32 hi; |
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73 | |||
74 | b53_mmap_read16(dev, page, reg, &lo); |
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75 | b53_mmap_read32(dev, page, reg + 2, &hi); |
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76 | |||
77 | *val = ((u64)hi << 16) | lo; |
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78 | } else { |
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79 | u32 lo; |
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80 | u16 hi; |
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81 | |||
82 | b53_mmap_read32(dev, page, reg, &lo); |
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83 | b53_mmap_read16(dev, page, reg + 4, &hi); |
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84 | |||
85 | *val = ((u64)hi << 32) | lo; |
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86 | } |
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87 | |||
88 | return 0; |
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89 | } |
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90 | |||
91 | static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val) |
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92 | { |
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93 | u32 hi, lo; |
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94 | |||
95 | if (WARN_ON(reg % 4)) |
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96 | return -EINVAL; |
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97 | |||
98 | b53_mmap_read32(dev, page, reg, &lo); |
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99 | b53_mmap_read32(dev, page, reg + 4, &hi); |
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100 | |||
101 | *val = ((u64)hi << 32) | lo; |
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102 | |||
103 | return 0; |
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104 | } |
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105 | |||
106 | static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value) |
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107 | { |
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108 | u8 __iomem *regs = dev->priv; |
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109 | |||
110 | writeb(value, regs + (page << 8) + reg); |
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111 | |||
112 | return 0; |
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113 | } |
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114 | |||
115 | static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg, |
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116 | u16 value) |
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117 | { |
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118 | u8 __iomem *regs = dev->priv; |
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119 | |||
120 | if (WARN_ON(reg % 2)) |
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121 | return -EINVAL; |
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122 | |||
123 | if (dev->pdata && dev->pdata->big_endian) |
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124 | writew_be(value, regs + (page << 8) + reg); |
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125 | else |
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126 | writew(value, regs + (page << 8) + reg); |
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127 | |||
128 | return 0; |
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129 | } |
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130 | |||
131 | static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg, |
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132 | u32 value) |
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133 | { |
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134 | u8 __iomem *regs = dev->priv; |
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135 | |||
136 | if (WARN_ON(reg % 4)) |
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137 | return -EINVAL; |
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138 | |||
139 | if (dev->pdata && dev->pdata->big_endian) |
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140 | writel_be(value, regs + (page << 8) + reg); |
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141 | else |
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142 | writel(value, regs + (page << 8) + reg); |
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143 | |||
144 | return 0; |
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145 | } |
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146 | |||
147 | static int b53_mmap_write48(struct b53_device *dev, u8 page, u8 reg, |
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148 | u64 value) |
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149 | { |
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150 | if (WARN_ON(reg % 2)) |
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151 | return -EINVAL; |
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152 | |||
153 | if (reg % 4) { |
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154 | u32 hi = (u32)(value >> 16); |
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155 | u16 lo = (u16)value; |
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156 | |||
157 | b53_mmap_write16(dev, page, reg, lo); |
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158 | b53_mmap_write32(dev, page, reg + 2, hi); |
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159 | } else { |
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160 | u16 hi = (u16)(value >> 32); |
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161 | u32 lo = (u32)value; |
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162 | |||
163 | b53_mmap_write32(dev, page, reg, lo); |
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164 | b53_mmap_write16(dev, page, reg + 4, hi); |
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165 | } |
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166 | |||
167 | return 0; |
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168 | } |
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169 | |||
170 | static int b53_mmap_write64(struct b53_device *dev, u8 page, u8 reg, |
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171 | u64 value) |
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172 | { |
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173 | u32 hi, lo; |
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174 | |||
175 | hi = (u32)(value >> 32); |
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176 | lo = (u32)value; |
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177 | |||
178 | if (WARN_ON(reg % 4)) |
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179 | return -EINVAL; |
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180 | |||
181 | b53_mmap_write32(dev, page, reg, lo); |
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182 | b53_mmap_write32(dev, page, reg + 4, hi); |
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183 | |||
184 | return 0; |
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185 | } |
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186 | |||
187 | static struct b53_io_ops b53_mmap_ops = { |
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188 | .read8 = b53_mmap_read8, |
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189 | .read16 = b53_mmap_read16, |
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190 | .read32 = b53_mmap_read32, |
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191 | .read48 = b53_mmap_read48, |
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192 | .read64 = b53_mmap_read64, |
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193 | .write8 = b53_mmap_write8, |
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194 | .write16 = b53_mmap_write16, |
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195 | .write32 = b53_mmap_write32, |
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196 | .write48 = b53_mmap_write48, |
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197 | .write64 = b53_mmap_write64, |
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198 | }; |
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199 | |||
200 | static int b53_mmap_probe(struct platform_device *pdev) |
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201 | { |
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202 | struct b53_platform_data *pdata = pdev->dev.platform_data; |
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203 | struct b53_device *dev; |
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204 | |||
205 | if (!pdata) |
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206 | return -EINVAL; |
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207 | |||
208 | dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, pdata->regs); |
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209 | if (!dev) |
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210 | return -ENOMEM; |
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211 | |||
212 | if (pdata) |
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213 | dev->pdata = pdata; |
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214 | |||
215 | platform_set_drvdata(pdev, dev); |
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216 | |||
217 | return b53_switch_register(dev); |
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218 | } |
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219 | |||
220 | static int b53_mmap_remove(struct platform_device *pdev) |
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221 | { |
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222 | struct b53_device *dev = platform_get_drvdata(pdev); |
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223 | |||
224 | if (dev) |
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225 | b53_switch_remove(dev); |
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226 | |||
227 | return 0; |
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228 | } |
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229 | |||
230 | static struct platform_driver b53_mmap_driver = { |
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231 | .probe = b53_mmap_probe, |
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232 | .remove = b53_mmap_remove, |
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233 | .driver = { |
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234 | .name = "b53-switch", |
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235 | }, |
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236 | }; |
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237 | |||
238 | module_platform_driver(b53_mmap_driver); |
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239 | MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>"); |
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240 | MODULE_DESCRIPTION("B53 MMAP access driver"); |
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241 | MODULE_LICENSE("Dual BSD/GPL"); |