drivers/net/dsa/b53/b53_mmap.c

   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 (dev->pdata && dev->pdata->big_endian)
  49                 *val = ioread16be(regs + (page << 8) + reg);
  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
  63         if (dev->pdata && dev->pdata->big_endian)
  64                 *val = ioread32be(regs + (page << 8) + reg);
  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 {
  73         u8 __iomem *regs = dev->priv;
  74
  75         if (WARN_ON(reg % 2))
  76                 return -EINVAL;
  77
  78         if (reg % 4) {
  79                 u16 lo;
  80                 u32 hi;
  81
  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                 }
  89
  90                 *val = ((u64)hi << 16) | lo;
  91         } else {
  92                 u32 lo;
  93                 u16 hi;
  94
  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                 }
 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 {
 111         u8 __iomem *regs = dev->priv;
 112         u32 hi, lo;
 113
 114         if (WARN_ON(reg % 4))
 115                 return -EINVAL;
 116
 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         }
 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
 147         if (dev->pdata && dev->pdata->big_endian)
 148                 iowrite16be(value, regs + (page << 8) + reg);
 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
 163         if (dev->pdata && dev->pdata->big_endian)
 164                 iowrite32be(value, regs + (page << 8) + reg);
 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
 211 static struct b53_io_ops b53_mmap_ops = {
 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
 236         dev->pdata = pdata;
 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");