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/module.h>
  21 #include <linux/io.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/platform_data/b53.h>
  24
  25 #include "b53_priv.h"
  26
  27 struct b53_mmap_priv {
  28         void __iomem *regs;
  29 };
  30
  31 static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
  32 {
  33         u8 __iomem *regs = dev->priv;
  34
  35         *val = readb(regs + (page << 8) + reg);
  36
  37         return 0;
  38 }
  39
  40 static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
  41 {
  42         u8 __iomem *regs = dev->priv;
  43
  44         if (WARN_ON(reg % 2))
  45                 return -EINVAL;
  46
  47         if (dev->pdata && dev->pdata->big_endian)
  48                 *val = ioread16be(regs + (page << 8) + reg);
  49         else
  50                 *val = readw(regs + (page << 8) + reg);
  51
  52         return 0;
  53 }
  54
  55 static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val)
  56 {
  57         u8 __iomem *regs = dev->priv;
  58
  59         if (WARN_ON(reg % 4))
  60                 return -EINVAL;
  61
  62         if (dev->pdata && dev->pdata->big_endian)
  63                 *val = ioread32be(regs + (page << 8) + reg);
  64         else
  65                 *val = readl(regs + (page << 8) + reg);
  66
  67         return 0;
  68 }
  69
  70 static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val)
  71 {
  72         u8 __iomem *regs = dev->priv;
  73
  74         if (WARN_ON(reg % 2))
  75                 return -EINVAL;
  76
  77         if (reg % 4) {
  78                 u16 lo;
  79                 u32 hi;
  80
  81                 if (dev->pdata && dev->pdata->big_endian) {
  82                         lo = ioread16be(regs + (page << 8) + reg);
  83                         hi = ioread32be(regs + (page << 8) + reg + 2);
  84                 } else {
  85                         lo = readw(regs + (page << 8) + reg);
  86                         hi = readl(regs + (page << 8) + reg + 2);
  87                 }
  88
  89                 *val = ((u64)hi << 16) | lo;
  90         } else {
  91                 u32 lo;
  92                 u16 hi;
  93
  94                 if (dev->pdata && dev->pdata->big_endian) {
  95                         lo = ioread32be(regs + (page << 8) + reg);
  96                         hi = ioread16be(regs + (page << 8) + reg + 4);
  97                 } else {
  98                         lo = readl(regs + (page << 8) + reg);
  99                         hi = readw(regs + (page << 8) + reg + 4);
 100                 }
 101
 102                 *val = ((u64)hi << 32) | lo;
 103         }
 104
 105         return 0;
 106 }
 107
 108 static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
 109 {
 110         u8 __iomem *regs = dev->priv;
 111         u32 hi, lo;
 112
 113         if (WARN_ON(reg % 4))
 114                 return -EINVAL;
 115
 116         if (dev->pdata && dev->pdata->big_endian) {
 117                 lo = ioread32be(regs + (page << 8) + reg);
 118                 hi = ioread32be(regs + (page << 8) + reg + 4);
 119         } else {
 120                 lo = readl(regs + (page << 8) + reg);
 121                 hi = readl(regs + (page << 8) + reg + 4);
 122         }
 123
 124         *val = ((u64)hi << 32) | lo;
 125
 126         return 0;
 127 }
 128
 129 static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
 130 {
 131         u8 __iomem *regs = dev->priv;
 132
 133         writeb(value, regs + (page << 8) + reg);
 134
 135         return 0;
 136 }
 137
 138 static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg,
 139                             u16 value)
 140 {
 141         u8 __iomem *regs = dev->priv;
 142
 143         if (WARN_ON(reg % 2))
 144                 return -EINVAL;
 145
 146         if (dev->pdata && dev->pdata->big_endian)
 147                 iowrite16be(value, regs + (page << 8) + reg);
 148         else
 149                 writew(value, regs + (page << 8) + reg);
 150
 151         return 0;
 152 }
 153
 154 static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg,
 155                             u32 value)
 156 {
 157         u8 __iomem *regs = dev->priv;
 158
 159         if (WARN_ON(reg % 4))
 160                 return -EINVAL;
 161
 162         if (dev->pdata && dev->pdata->big_endian)
 163                 iowrite32be(value, regs + (page << 8) + reg);
 164         else
 165                 writel(value, regs + (page << 8) + reg);
 166
 167         return 0;
 168 }
 169
 170 static int b53_mmap_write48(struct b53_device *dev, u8 page, u8 reg,
 171                             u64 value)
 172 {
 173         if (WARN_ON(reg % 2))
 174                 return -EINVAL;
 175
 176         if (reg % 4) {
 177                 u32 hi = (u32)(value >> 16);
 178                 u16 lo = (u16)value;
 179
 180                 b53_mmap_write16(dev, page, reg, lo);
 181                 b53_mmap_write32(dev, page, reg + 2, hi);
 182         } else {
 183                 u16 hi = (u16)(value >> 32);
 184                 u32 lo = (u32)value;
 185
 186                 b53_mmap_write32(dev, page, reg, lo);
 187                 b53_mmap_write16(dev, page, reg + 4, hi);
 188         }
 189
 190         return 0;
 191 }
 192
 193 static int b53_mmap_write64(struct b53_device *dev, u8 page, u8 reg,
 194                             u64 value)
 195 {
 196         u32 hi, lo;
 197
 198         hi = upper_32_bits(value);
 199         lo = lower_32_bits(value);
 200
 201         if (WARN_ON(reg % 4))
 202                 return -EINVAL;
 203
 204         b53_mmap_write32(dev, page, reg, lo);
 205         b53_mmap_write32(dev, page, reg + 4, hi);
 206
 207         return 0;
 208 }
 209
 210 static const struct b53_io_ops b53_mmap_ops = {
 211         .read8 = b53_mmap_read8,
 212         .read16 = b53_mmap_read16,
 213         .read32 = b53_mmap_read32,
 214         .read48 = b53_mmap_read48,
 215         .read64 = b53_mmap_read64,
 216         .write8 = b53_mmap_write8,
 217         .write16 = b53_mmap_write16,
 218         .write32 = b53_mmap_write32,
 219         .write48 = b53_mmap_write48,
 220         .write64 = b53_mmap_write64,
 221 };
 222
 223 static int b53_mmap_probe(struct platform_device *pdev)
 224 {
 225         struct b53_platform_data *pdata = pdev->dev.platform_data;
 226         struct b53_device *dev;
 227
 228         if (!pdata)
 229                 return -EINVAL;
 230
 231         dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, pdata->regs);
 232         if (!dev)
 233                 return -ENOMEM;
 234
 235         dev->pdata = pdata;
 236
 237         platform_set_drvdata(pdev, dev);
 238
 239         return b53_switch_register(dev);
 240 }
 241
 242 static int b53_mmap_remove(struct platform_device *pdev)
 243 {
 244         struct b53_device *dev = platform_get_drvdata(pdev);
 245
 246         if (dev)
 247                 b53_switch_remove(dev);
 248
 249         return 0;
 250 }
 251
 252 static const struct of_device_id b53_mmap_of_table[] = {
 253         { .compatible = "brcm,bcm3384-switch" },
 254         { .compatible = "brcm,bcm6328-switch" },
 255         { .compatible = "brcm,bcm6368-switch" },
 256         { .compatible = "brcm,bcm63xx-switch" },
 257         { /* sentinel */ },
 258 };
 259 MODULE_DEVICE_TABLE(of, b53_mmap_of_table);
 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");