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/bits.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/io.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/platform_data/b53.h>
  26
  27 #include "b53_priv.h"
  28
  29 struct b53_mmap_priv {
  30         void __iomem *regs;
  31 };
  32
  33 static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
  34 {
  35         struct b53_mmap_priv *priv = dev->priv;
  36         void __iomem *regs = priv->regs;
  37
  38         *val = readb(regs + (page << 8) + reg);
  39
  40         return 0;
  41 }
  42
  43 static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
  44 {
  45         struct b53_mmap_priv *priv = dev->priv;
  46         void __iomem *regs = priv->regs;
  47
  48         if (WARN_ON(reg % 2))
  49                 return -EINVAL;
  50
  51         if (dev->pdata && dev->pdata->big_endian)
  52                 *val = ioread16be(regs + (page << 8) + reg);
  53         else
  54                 *val = readw(regs + (page << 8) + reg);
  55
  56         return 0;
  57 }
  58
  59 static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val)
  60 {
  61         struct b53_mmap_priv *priv = dev->priv;
  62         void __iomem *regs = priv->regs;
  63
  64         if (WARN_ON(reg % 4))
  65                 return -EINVAL;
  66
  67         if (dev->pdata && dev->pdata->big_endian)
  68                 *val = ioread32be(regs + (page << 8) + reg);
  69         else
  70                 *val = readl(regs + (page << 8) + reg);
  71
  72         return 0;
  73 }
  74
  75 static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val)
  76 {
  77         struct b53_mmap_priv *priv = dev->priv;
  78         void __iomem *regs = priv->regs;
  79
  80         if (WARN_ON(reg % 2))
  81                 return -EINVAL;
  82
  83         if (reg % 4) {
  84                 u16 lo;
  85                 u32 hi;
  86
  87                 if (dev->pdata && dev->pdata->big_endian) {
  88                         lo = ioread16be(regs + (page << 8) + reg);
  89                         hi = ioread32be(regs + (page << 8) + reg + 2);
  90                 } else {
  91                         lo = readw(regs + (page << 8) + reg);
  92                         hi = readl(regs + (page << 8) + reg + 2);
  93                 }
  94
  95                 *val = ((u64)hi << 16) | lo;
  96         } else {
  97                 u32 lo;
  98                 u16 hi;
  99
 100                 if (dev->pdata && dev->pdata->big_endian) {
 101                         lo = ioread32be(regs + (page << 8) + reg);
 102                         hi = ioread16be(regs + (page << 8) + reg + 4);
 103                 } else {
 104                         lo = readl(regs + (page << 8) + reg);
 105                         hi = readw(regs + (page << 8) + reg + 4);
 106                 }
 107
 108                 *val = ((u64)hi << 32) | lo;
 109         }
 110
 111         return 0;
 112 }
 113
 114 static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
 115 {
 116         struct b53_mmap_priv *priv = dev->priv;
 117         void __iomem *regs = priv->regs;
 118         u32 hi, lo;
 119
 120         if (WARN_ON(reg % 4))
 121                 return -EINVAL;
 122
 123         if (dev->pdata && dev->pdata->big_endian) {
 124                 lo = ioread32be(regs + (page << 8) + reg);
 125                 hi = ioread32be(regs + (page << 8) + reg + 4);
 126         } else {
 127                 lo = readl(regs + (page << 8) + reg);
 128                 hi = readl(regs + (page << 8) + reg + 4);
 129         }
 130
 131         *val = ((u64)hi << 32) | lo;
 132
 133         return 0;
 134 }
 135
 136 static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
 137 {
 138         struct b53_mmap_priv *priv = dev->priv;
 139         void __iomem *regs = priv->regs;
 140
 141         writeb(value, regs + (page << 8) + reg);
 142
 143         return 0;
 144 }
 145
 146 static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg,
 147                             u16 value)
 148 {
 149         struct b53_mmap_priv *priv = dev->priv;
 150         void __iomem *regs = priv->regs;
 151
 152         if (WARN_ON(reg % 2))
 153                 return -EINVAL;
 154
 155         if (dev->pdata && dev->pdata->big_endian)
 156                 iowrite16be(value, regs + (page << 8) + reg);
 157         else
 158                 writew(value, regs + (page << 8) + reg);
 159
 160         return 0;
 161 }
 162
 163 static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg,
 164                             u32 value)
 165 {
 166         struct b53_mmap_priv *priv = dev->priv;
 167         void __iomem *regs = priv->regs;
 168
 169         if (WARN_ON(reg % 4))
 170                 return -EINVAL;
 171
 172         if (dev->pdata && dev->pdata->big_endian)
 173                 iowrite32be(value, regs + (page << 8) + reg);
 174         else
 175                 writel(value, regs + (page << 8) + reg);
 176
 177         return 0;
 178 }
 179
 180 static int b53_mmap_write48(struct b53_device *dev, u8 page, u8 reg,
 181                             u64 value)
 182 {
 183         if (WARN_ON(reg % 2))
 184                 return -EINVAL;
 185
 186         if (reg % 4) {
 187                 u32 hi = (u32)(value >> 16);
 188                 u16 lo = (u16)value;
 189
 190                 b53_mmap_write16(dev, page, reg, lo);
 191                 b53_mmap_write32(dev, page, reg + 2, hi);
 192         } else {
 193                 u16 hi = (u16)(value >> 32);
 194                 u32 lo = (u32)value;
 195
 196                 b53_mmap_write32(dev, page, reg, lo);
 197                 b53_mmap_write16(dev, page, reg + 4, hi);
 198         }
 199
 200         return 0;
 201 }
 202
 203 static int b53_mmap_write64(struct b53_device *dev, u8 page, u8 reg,
 204                             u64 value)
 205 {
 206         u32 hi, lo;
 207
 208         hi = upper_32_bits(value);
 209         lo = lower_32_bits(value);
 210
 211         if (WARN_ON(reg % 4))
 212                 return -EINVAL;
 213
 214         b53_mmap_write32(dev, page, reg, lo);
 215         b53_mmap_write32(dev, page, reg + 4, hi);
 216
 217         return 0;
 218 }
 219
 220 static int b53_mmap_phy_read16(struct b53_device *dev, int addr, int reg,
 221                                u16 *value)
 222 {
 223         return -EIO;
 224 }
 225
 226 static int b53_mmap_phy_write16(struct b53_device *dev, int addr, int reg,
 227                                 u16 value)
 228 {
 229         return -EIO;
 230 }
 231
 232 static const struct b53_io_ops b53_mmap_ops = {
 233         .read8 = b53_mmap_read8,
 234         .read16 = b53_mmap_read16,
 235         .read32 = b53_mmap_read32,
 236         .read48 = b53_mmap_read48,
 237         .read64 = b53_mmap_read64,
 238         .write8 = b53_mmap_write8,
 239         .write16 = b53_mmap_write16,
 240         .write32 = b53_mmap_write32,
 241         .write48 = b53_mmap_write48,
 242         .write64 = b53_mmap_write64,
 243         .phy_read16 = b53_mmap_phy_read16,
 244         .phy_write16 = b53_mmap_phy_write16,
 245 };
 246
 247 static int b53_mmap_probe_of(struct platform_device *pdev,
 248                              struct b53_platform_data **ppdata)
 249 {
 250         struct device_node *np = pdev->dev.of_node;
 251         struct device_node *of_ports, *of_port;
 252         struct device *dev = &pdev->dev;
 253         struct b53_platform_data *pdata;
 254         void __iomem *mem;
 255
 256         mem = devm_platform_ioremap_resource(pdev, 0);
 257         if (IS_ERR(mem))
 258                 return PTR_ERR(mem);
 259
 260         pdata = devm_kzalloc(dev, sizeof(struct b53_platform_data),
 261                              GFP_KERNEL);
 262         if (!pdata)
 263                 return -ENOMEM;
 264
 265         pdata->regs = mem;
 266         pdata->chip_id = (u32)(unsigned long)device_get_match_data(dev);
 267         pdata->big_endian = of_property_read_bool(np, "big-endian");
 268
 269         of_ports = of_get_child_by_name(np, "ports");
 270         if (!of_ports) {
 271                 dev_err(dev, "no ports child node found\n");
 272                 return -EINVAL;
 273         }
 274
 275         for_each_available_child_of_node(of_ports, of_port) {
 276                 u32 reg;
 277
 278                 if (of_property_read_u32(of_port, "reg", &reg))
 279                         continue;
 280
 281                 if (reg < B53_N_PORTS)
 282                         pdata->enabled_ports |= BIT(reg);
 283         }
 284
 285         of_node_put(of_ports);
 286         *ppdata = pdata;
 287
 288         return 0;
 289 }
 290
 291 static int b53_mmap_probe(struct platform_device *pdev)
 292 {
 293         struct device_node *np = pdev->dev.of_node;
 294         struct b53_platform_data *pdata = pdev->dev.platform_data;
 295         struct b53_mmap_priv *priv;
 296         struct b53_device *dev;
 297         int ret;
 298
 299         if (!pdata && np) {
 300                 ret = b53_mmap_probe_of(pdev, &pdata);
 301                 if (ret) {
 302                         dev_err(&pdev->dev, "OF probe error\n");
 303                         return ret;
 304                 }
 305         }
 306
 307         if (!pdata)
 308                 return -EINVAL;
 309
 310         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 311         if (!priv)
 312                 return -ENOMEM;
 313
 314         priv->regs = pdata->regs;
 315
 316         dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, priv);
 317         if (!dev)
 318                 return -ENOMEM;
 319
 320         dev->pdata = pdata;
 321
 322         platform_set_drvdata(pdev, dev);
 323
 324         return b53_switch_register(dev);
 325 }
 326
 327 static void b53_mmap_remove(struct platform_device *pdev)
 328 {
 329         struct b53_device *dev = platform_get_drvdata(pdev);
 330
 331         if (dev)
 332                 b53_switch_remove(dev);
 333 }
 334
 335 static void b53_mmap_shutdown(struct platform_device *pdev)
 336 {
 337         struct b53_device *dev = platform_get_drvdata(pdev);
 338
 339         if (dev)
 340                 b53_switch_shutdown(dev);
 341
 342         platform_set_drvdata(pdev, NULL);
 343 }
 344
 345 static const struct of_device_id b53_mmap_of_table[] = {
 346         {
 347                 .compatible = "brcm,bcm3384-switch",
 348                 .data = (void *)BCM63XX_DEVICE_ID,
 349         }, {
 350                 .compatible = "brcm,bcm6318-switch",
 351                 .data = (void *)BCM63268_DEVICE_ID,
 352         }, {
 353                 .compatible = "brcm,bcm6328-switch",
 354                 .data = (void *)BCM63XX_DEVICE_ID,
 355         }, {
 356                 .compatible = "brcm,bcm6362-switch",
 357                 .data = (void *)BCM63XX_DEVICE_ID,
 358         }, {
 359                 .compatible = "brcm,bcm6368-switch",
 360                 .data = (void *)BCM63XX_DEVICE_ID,
 361         }, {
 362                 .compatible = "brcm,bcm63268-switch",
 363                 .data = (void *)BCM63268_DEVICE_ID,
 364         }, {
 365                 .compatible = "brcm,bcm63xx-switch",
 366                 .data = (void *)BCM63XX_DEVICE_ID,
 367         }, { /* sentinel */ }
 368 };
 369 MODULE_DEVICE_TABLE(of, b53_mmap_of_table);
 370
 371 static struct platform_driver b53_mmap_driver = {
 372         .probe = b53_mmap_probe,
 373         .remove = b53_mmap_remove,
 374         .shutdown = b53_mmap_shutdown,
 375         .driver = {
 376                 .name = "b53-switch",
 377                 .of_match_table = b53_mmap_of_table,
 378         },
 379 };
 380
 381 module_platform_driver(b53_mmap_driver);
 382 MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
 383 MODULE_DESCRIPTION("B53 MMAP access driver");
 384 MODULE_LICENSE("Dual BSD/GPL");