Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * B53 register access through memory mapped registers |
| 3 | * |
| 4 | * Copyright (C) 2012-2013 Jonas Gorski <jogo@openwrt.org> |
| 5 | * |
| 6 | * Permission to use, copy, modify, and/or distribute this software for any |
| 7 | * purpose with or without fee is hereby granted, provided that the above |
| 8 | * copyright notice and this permission notice appear in all copies. |
| 9 | * |
| 10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/kconfig.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/io.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/platform_data/b53.h> |
| 25 | |
| 26 | #include "b53_priv.h" |
| 27 | |
| 28 | struct b53_mmap_priv { |
| 29 | void __iomem *regs; |
| 30 | }; |
| 31 | |
| 32 | static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val) |
| 33 | { |
| 34 | u8 __iomem *regs = dev->priv; |
| 35 | |
| 36 | *val = readb(regs + (page << 8) + reg); |
| 37 | |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val) |
| 42 | { |
| 43 | u8 __iomem *regs = dev->priv; |
| 44 | |
| 45 | if (WARN_ON(reg % 2)) |
| 46 | return -EINVAL; |
| 47 | |
| 48 | if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && dev->pdata && |
| 49 | dev->pdata->big_endian) |
| 50 | *val = __raw_readw(regs + (page << 8) + reg); |
| 51 | else |
| 52 | *val = readw(regs + (page << 8) + reg); |
| 53 | |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val) |
| 58 | { |
| 59 | u8 __iomem *regs = dev->priv; |
| 60 | |
| 61 | if (WARN_ON(reg % 4)) |
| 62 | return -EINVAL; |
| 63 | |
| 64 | if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && dev->pdata && |
| 65 | dev->pdata->big_endian) |
| 66 | *val = __raw_readl(regs + (page << 8) + reg); |
| 67 | else |
| 68 | *val = readl(regs + (page << 8) + reg); |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val) |
| 74 | { |
| 75 | if (WARN_ON(reg % 2)) |
| 76 | return -EINVAL; |
| 77 | |
| 78 | if (reg % 4) { |
| 79 | u16 lo; |
| 80 | u32 hi; |
| 81 | |
| 82 | b53_mmap_read16(dev, page, reg, &lo); |
| 83 | b53_mmap_read32(dev, page, reg + 2, &hi); |
| 84 | |
| 85 | *val = ((u64)hi << 16) | lo; |
| 86 | } else { |
| 87 | u32 lo; |
| 88 | u16 hi; |
| 89 | |
| 90 | b53_mmap_read32(dev, page, reg, &lo); |
| 91 | b53_mmap_read16(dev, page, reg + 4, &hi); |
| 92 | |
| 93 | *val = ((u64)hi << 32) | lo; |
| 94 | } |
| 95 | |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val) |
| 100 | { |
| 101 | u32 hi, lo; |
| 102 | |
| 103 | if (WARN_ON(reg % 4)) |
| 104 | return -EINVAL; |
| 105 | |
| 106 | b53_mmap_read32(dev, page, reg, &lo); |
| 107 | b53_mmap_read32(dev, page, reg + 4, &hi); |
| 108 | |
| 109 | *val = ((u64)hi << 32) | lo; |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value) |
| 115 | { |
| 116 | u8 __iomem *regs = dev->priv; |
| 117 | |
| 118 | writeb(value, regs + (page << 8) + reg); |
| 119 | |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg, |
| 124 | u16 value) |
| 125 | { |
| 126 | u8 __iomem *regs = dev->priv; |
| 127 | |
| 128 | if (WARN_ON(reg % 2)) |
| 129 | return -EINVAL; |
| 130 | |
| 131 | if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && dev->pdata && |
| 132 | dev->pdata->big_endian) |
| 133 | __raw_writew(value, regs + (page << 8) + reg); |
| 134 | else |
| 135 | writew(value, regs + (page << 8) + reg); |
| 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg, |
| 141 | u32 value) |
| 142 | { |
| 143 | u8 __iomem *regs = dev->priv; |
| 144 | |
| 145 | if (WARN_ON(reg % 4)) |
| 146 | return -EINVAL; |
| 147 | |
| 148 | if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && dev->pdata && |
| 149 | dev->pdata->big_endian) |
| 150 | __raw_writel(value, regs + (page << 8) + reg); |
| 151 | else |
| 152 | writel(value, regs + (page << 8) + reg); |
| 153 | |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | static int b53_mmap_write48(struct b53_device *dev, u8 page, u8 reg, |
| 158 | u64 value) |
| 159 | { |
| 160 | if (WARN_ON(reg % 2)) |
| 161 | return -EINVAL; |
| 162 | |
| 163 | if (reg % 4) { |
| 164 | u32 hi = (u32)(value >> 16); |
| 165 | u16 lo = (u16)value; |
| 166 | |
| 167 | b53_mmap_write16(dev, page, reg, lo); |
| 168 | b53_mmap_write32(dev, page, reg + 2, hi); |
| 169 | } else { |
| 170 | u16 hi = (u16)(value >> 32); |
| 171 | u32 lo = (u32)value; |
| 172 | |
| 173 | b53_mmap_write32(dev, page, reg, lo); |
| 174 | b53_mmap_write16(dev, page, reg + 4, hi); |
| 175 | } |
| 176 | |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | static int b53_mmap_write64(struct b53_device *dev, u8 page, u8 reg, |
| 181 | u64 value) |
| 182 | { |
| 183 | u32 hi, lo; |
| 184 | |
| 185 | hi = upper_32_bits(value); |
| 186 | lo = lower_32_bits(value); |
| 187 | |
| 188 | if (WARN_ON(reg % 4)) |
| 189 | return -EINVAL; |
| 190 | |
| 191 | b53_mmap_write32(dev, page, reg, lo); |
| 192 | b53_mmap_write32(dev, page, reg + 4, hi); |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | static struct b53_io_ops b53_mmap_ops = { |
| 198 | .read8 = b53_mmap_read8, |
| 199 | .read16 = b53_mmap_read16, |
| 200 | .read32 = b53_mmap_read32, |
| 201 | .read48 = b53_mmap_read48, |
| 202 | .read64 = b53_mmap_read64, |
| 203 | .write8 = b53_mmap_write8, |
| 204 | .write16 = b53_mmap_write16, |
| 205 | .write32 = b53_mmap_write32, |
| 206 | .write48 = b53_mmap_write48, |
| 207 | .write64 = b53_mmap_write64, |
| 208 | }; |
| 209 | |
| 210 | static int b53_mmap_probe(struct platform_device *pdev) |
| 211 | { |
| 212 | struct b53_platform_data *pdata = pdev->dev.platform_data; |
| 213 | struct b53_device *dev; |
| 214 | |
| 215 | if (!pdata) |
| 216 | return -EINVAL; |
| 217 | |
| 218 | dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, pdata->regs); |
| 219 | if (!dev) |
| 220 | return -ENOMEM; |
| 221 | |
| 222 | if (pdata) |
| 223 | dev->pdata = pdata; |
| 224 | |
| 225 | platform_set_drvdata(pdev, dev); |
| 226 | |
| 227 | return b53_switch_register(dev); |
| 228 | } |
| 229 | |
| 230 | static int b53_mmap_remove(struct platform_device *pdev) |
| 231 | { |
| 232 | struct b53_device *dev = platform_get_drvdata(pdev); |
| 233 | |
| 234 | if (dev) |
| 235 | b53_switch_remove(dev); |
| 236 | |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | static const struct of_device_id b53_mmap_of_table[] = { |
| 241 | { .compatible = "brcm,bcm3384-switch" }, |
| 242 | { .compatible = "brcm,bcm6328-switch" }, |
| 243 | { .compatible = "brcm,bcm6368-switch" }, |
| 244 | { .compatible = "brcm,bcm63xx-switch" }, |
| 245 | { /* sentinel */ }, |
| 246 | }; |
| 247 | |
| 248 | static struct platform_driver b53_mmap_driver = { |
| 249 | .probe = b53_mmap_probe, |
| 250 | .remove = b53_mmap_remove, |
| 251 | .driver = { |
| 252 | .name = "b53-switch", |
| 253 | .of_match_table = b53_mmap_of_table, |
| 254 | }, |
| 255 | }; |
| 256 | |
| 257 | module_platform_driver(b53_mmap_driver); |
| 258 | MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>"); |
| 259 | MODULE_DESCRIPTION("B53 MMAP access driver"); |
| 260 | MODULE_LICENSE("Dual BSD/GPL"); |