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 | |
Arnd Bergmann | 55e7f6a | 2016-06-16 11:00:05 +0200 | [diff] [blame] | 48 | if (dev->pdata && dev->pdata->big_endian) |
| 49 | *val = ioread16be(regs + (page << 8) + reg); |
Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame] | 50 | else |
| 51 | *val = readw(regs + (page << 8) + reg); |
| 52 | |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val) |
| 57 | { |
| 58 | u8 __iomem *regs = dev->priv; |
| 59 | |
| 60 | if (WARN_ON(reg % 4)) |
| 61 | return -EINVAL; |
| 62 | |
Arnd Bergmann | 55e7f6a | 2016-06-16 11:00:05 +0200 | [diff] [blame] | 63 | if (dev->pdata && dev->pdata->big_endian) |
| 64 | *val = ioread32be(regs + (page << 8) + reg); |
Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame] | 65 | else |
| 66 | *val = readl(regs + (page << 8) + reg); |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val) |
| 72 | { |
Arnd Bergmann | 5eca291 | 2016-06-27 11:19:13 +0200 | [diff] [blame] | 73 | u8 __iomem *regs = dev->priv; |
| 74 | |
Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame] | 75 | if (WARN_ON(reg % 2)) |
| 76 | return -EINVAL; |
| 77 | |
| 78 | if (reg % 4) { |
| 79 | u16 lo; |
| 80 | u32 hi; |
| 81 | |
Arnd Bergmann | 5eca291 | 2016-06-27 11:19:13 +0200 | [diff] [blame] | 82 | if (dev->pdata && dev->pdata->big_endian) { |
| 83 | lo = ioread16be(regs + (page << 8) + reg); |
| 84 | hi = ioread32be(regs + (page << 8) + reg + 2); |
| 85 | } else { |
| 86 | lo = readw(regs + (page << 8) + reg); |
| 87 | hi = readl(regs + (page << 8) + reg + 2); |
| 88 | } |
Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame] | 89 | |
| 90 | *val = ((u64)hi << 16) | lo; |
| 91 | } else { |
| 92 | u32 lo; |
| 93 | u16 hi; |
| 94 | |
Arnd Bergmann | 5eca291 | 2016-06-27 11:19:13 +0200 | [diff] [blame] | 95 | if (dev->pdata && dev->pdata->big_endian) { |
| 96 | lo = ioread32be(regs + (page << 8) + reg); |
| 97 | hi = ioread16be(regs + (page << 8) + reg + 4); |
| 98 | } else { |
| 99 | lo = readl(regs + (page << 8) + reg); |
| 100 | hi = readw(regs + (page << 8) + reg + 4); |
| 101 | } |
Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame] | 102 | |
| 103 | *val = ((u64)hi << 32) | lo; |
| 104 | } |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val) |
| 110 | { |
Arnd Bergmann | 5eca291 | 2016-06-27 11:19:13 +0200 | [diff] [blame] | 111 | u8 __iomem *regs = dev->priv; |
Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame] | 112 | u32 hi, lo; |
| 113 | |
| 114 | if (WARN_ON(reg % 4)) |
| 115 | return -EINVAL; |
| 116 | |
Arnd Bergmann | 5eca291 | 2016-06-27 11:19:13 +0200 | [diff] [blame] | 117 | if (dev->pdata && dev->pdata->big_endian) { |
| 118 | lo = ioread32be(regs + (page << 8) + reg); |
| 119 | hi = ioread32be(regs + (page << 8) + reg + 4); |
| 120 | } else { |
| 121 | lo = readl(regs + (page << 8) + reg); |
| 122 | hi = readl(regs + (page << 8) + reg + 4); |
| 123 | } |
Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame] | 124 | |
| 125 | *val = ((u64)hi << 32) | lo; |
| 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value) |
| 131 | { |
| 132 | u8 __iomem *regs = dev->priv; |
| 133 | |
| 134 | writeb(value, regs + (page << 8) + reg); |
| 135 | |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg, |
| 140 | u16 value) |
| 141 | { |
| 142 | u8 __iomem *regs = dev->priv; |
| 143 | |
| 144 | if (WARN_ON(reg % 2)) |
| 145 | return -EINVAL; |
| 146 | |
Arnd Bergmann | 55e7f6a | 2016-06-16 11:00:05 +0200 | [diff] [blame] | 147 | if (dev->pdata && dev->pdata->big_endian) |
| 148 | iowrite16be(value, regs + (page << 8) + reg); |
Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame] | 149 | else |
| 150 | writew(value, regs + (page << 8) + reg); |
| 151 | |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg, |
| 156 | u32 value) |
| 157 | { |
| 158 | u8 __iomem *regs = dev->priv; |
| 159 | |
| 160 | if (WARN_ON(reg % 4)) |
| 161 | return -EINVAL; |
| 162 | |
Arnd Bergmann | 55e7f6a | 2016-06-16 11:00:05 +0200 | [diff] [blame] | 163 | if (dev->pdata && dev->pdata->big_endian) |
| 164 | iowrite32be(value, regs + (page << 8) + reg); |
Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame] | 165 | else |
| 166 | writel(value, regs + (page << 8) + reg); |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | static int b53_mmap_write48(struct b53_device *dev, u8 page, u8 reg, |
| 172 | u64 value) |
| 173 | { |
| 174 | if (WARN_ON(reg % 2)) |
| 175 | return -EINVAL; |
| 176 | |
| 177 | if (reg % 4) { |
| 178 | u32 hi = (u32)(value >> 16); |
| 179 | u16 lo = (u16)value; |
| 180 | |
| 181 | b53_mmap_write16(dev, page, reg, lo); |
| 182 | b53_mmap_write32(dev, page, reg + 2, hi); |
| 183 | } else { |
| 184 | u16 hi = (u16)(value >> 32); |
| 185 | u32 lo = (u32)value; |
| 186 | |
| 187 | b53_mmap_write32(dev, page, reg, lo); |
| 188 | b53_mmap_write16(dev, page, reg + 4, hi); |
| 189 | } |
| 190 | |
| 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | static int b53_mmap_write64(struct b53_device *dev, u8 page, u8 reg, |
| 195 | u64 value) |
| 196 | { |
| 197 | u32 hi, lo; |
| 198 | |
| 199 | hi = upper_32_bits(value); |
| 200 | lo = lower_32_bits(value); |
| 201 | |
| 202 | if (WARN_ON(reg % 4)) |
| 203 | return -EINVAL; |
| 204 | |
| 205 | b53_mmap_write32(dev, page, reg, lo); |
| 206 | b53_mmap_write32(dev, page, reg + 4, hi); |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
Julia Lawall | 0dff88d | 2016-08-09 19:09:45 +0200 | [diff] [blame] | 211 | static const struct b53_io_ops b53_mmap_ops = { |
Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame] | 212 | .read8 = b53_mmap_read8, |
| 213 | .read16 = b53_mmap_read16, |
| 214 | .read32 = b53_mmap_read32, |
| 215 | .read48 = b53_mmap_read48, |
| 216 | .read64 = b53_mmap_read64, |
| 217 | .write8 = b53_mmap_write8, |
| 218 | .write16 = b53_mmap_write16, |
| 219 | .write32 = b53_mmap_write32, |
| 220 | .write48 = b53_mmap_write48, |
| 221 | .write64 = b53_mmap_write64, |
| 222 | }; |
| 223 | |
| 224 | static int b53_mmap_probe(struct platform_device *pdev) |
| 225 | { |
| 226 | struct b53_platform_data *pdata = pdev->dev.platform_data; |
| 227 | struct b53_device *dev; |
| 228 | |
| 229 | if (!pdata) |
| 230 | return -EINVAL; |
| 231 | |
| 232 | dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, pdata->regs); |
| 233 | if (!dev) |
| 234 | return -ENOMEM; |
| 235 | |
xypron.glpk@gmx.de | 58d5aae | 2016-07-31 13:42:33 +0200 | [diff] [blame] | 236 | dev->pdata = pdata; |
Florian Fainelli | 967dd82 | 2016-06-09 18:23:53 -0700 | [diff] [blame] | 237 | |
| 238 | platform_set_drvdata(pdev, dev); |
| 239 | |
| 240 | return b53_switch_register(dev); |
| 241 | } |
| 242 | |
| 243 | static int b53_mmap_remove(struct platform_device *pdev) |
| 244 | { |
| 245 | struct b53_device *dev = platform_get_drvdata(pdev); |
| 246 | |
| 247 | if (dev) |
| 248 | b53_switch_remove(dev); |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | static const struct of_device_id b53_mmap_of_table[] = { |
| 254 | { .compatible = "brcm,bcm3384-switch" }, |
| 255 | { .compatible = "brcm,bcm6328-switch" }, |
| 256 | { .compatible = "brcm,bcm6368-switch" }, |
| 257 | { .compatible = "brcm,bcm63xx-switch" }, |
| 258 | { /* sentinel */ }, |
| 259 | }; |
| 260 | |
| 261 | static struct platform_driver b53_mmap_driver = { |
| 262 | .probe = b53_mmap_probe, |
| 263 | .remove = b53_mmap_remove, |
| 264 | .driver = { |
| 265 | .name = "b53-switch", |
| 266 | .of_match_table = b53_mmap_of_table, |
| 267 | }, |
| 268 | }; |
| 269 | |
| 270 | module_platform_driver(b53_mmap_driver); |
| 271 | MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>"); |
| 272 | MODULE_DESCRIPTION("B53 MMAP access driver"); |
| 273 | MODULE_LICENSE("Dual BSD/GPL"); |