LXR linux/drivers/net/dsa/b53/b53

   1/*
   2 * B53 register access through MII registers
   3 *
   4 * Copyright (C) 2011-2013 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/phy.h>
  21#include <linux/module.h>
  22#include <linux/delay.h>
  23#include <linux/brcmphy.h>
  24#include <linux/rtnetlink.h>
  25#include <net/dsa.h>
  26
  27#include "b53_priv.h"
  28
  29/* MII registers */
  30#define REG_MII_PAGE    0x10    /* MII Page register */
  31#define REG_MII_ADDR    0x11    /* MII Address register */
  32#define REG_MII_DATA0   0x18    /* MII Data register 0 */
  33#define REG_MII_DATA1   0x19    /* MII Data register 1 */
  34#define REG_MII_DATA2   0x1a    /* MII Data register 2 */
  35#define REG_MII_DATA3   0x1b    /* MII Data register 3 */
  36
  37#define REG_MII_PAGE_ENABLE     BIT(0)
  38#define REG_MII_ADDR_WRITE      BIT(0)
  39#define REG_MII_ADDR_READ       BIT(1)
  40
  41static int b53_mdio_op(struct b53_device *dev, u8 page, u8 reg, u16 op)
  42{
  43        int i;
  44        u16 v;
  45        int ret;
  46        struct mii_bus *bus = dev->priv;
  47
  48        if (dev->current_page != page) {
  49                /* set page number */
  50                v = (page << 8) | REG_MII_PAGE_ENABLE;
  51                ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR,
  52                                           REG_MII_PAGE, v);
  53                if (ret)
  54                        return ret;
  55                dev->current_page = page;
  56        }
  57
  58        /* set register address */
  59        v = (reg << 8) | op;
  60        ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_ADDR, v);
  61        if (ret)
  62                return ret;
  63
  64        /* check if operation completed */
  65        for (i = 0; i < 5; ++i) {
  66                v = mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR,
  67                                        REG_MII_ADDR);
  68                if (!(v & (REG_MII_ADDR_WRITE | REG_MII_ADDR_READ)))
  69                        break;
  70                usleep_range(10, 100);
  71        }
  72
  73        if (WARN_ON(i == 5))
  74                return -EIO;
  75
  76        return 0;
  77}
  78
  79static int b53_mdio_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
  80{
  81        struct mii_bus *bus = dev->priv;
  82        int ret;
  83
  84        ret = b53_mdio_op(dev, page, reg, REG_MII_ADDR_READ);
  85        if (ret)
  86                return ret;
  87
  88        *val = mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR,
  89                                   REG_MII_DATA0) & 0xff;
  90
  91        return 0;
  92}
  93
  94static int b53_mdio_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
  95{
  96        struct mii_bus *bus = dev->priv;
  97        int ret;
  98
  99        ret = b53_mdio_op(dev, page, reg, REG_MII_ADDR_READ);
 100        if (ret)
 101                return ret;
 102
 103        *val = mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0);
 104
 105        return 0;
 106}
 107
 108static int b53_mdio_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val)
 109{
 110        struct mii_bus *bus = dev->priv;
 111        int ret;
 112
 113        ret = b53_mdio_op(dev, page, reg, REG_MII_ADDR_READ);
 114        if (ret)
 115                return ret;
 116
 117        *val = mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0);
 118        *val |= mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR,
 119                                    REG_MII_DATA1) << 16;
 120
 121        return 0;
 122}
 123
 124static int b53_mdio_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val)
 125{
 126        struct mii_bus *bus = dev->priv;
 127        u64 temp = 0;
 128        int i;
 129        int ret;
 130
 131        ret = b53_mdio_op(dev, page, reg, REG_MII_ADDR_READ);
 132        if (ret)
 133                return ret;
 134
 135        for (i = 2; i >= 0; i--) {
 136                temp <<= 16;
 137                temp |= mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR,
 138                                     REG_MII_DATA0 + i);
 139        }
 140
 141        *val = temp;
 142
 143        return 0;
 144}
 145
 146static int b53_mdio_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
 147{
 148        struct mii_bus *bus = dev->priv;
 149        u64 temp = 0;
 150        int i;
 151        int ret;
 152
 153        ret = b53_mdio_op(dev, page, reg, REG_MII_ADDR_READ);
 154        if (ret)
 155                return ret;
 156
 157        for (i = 3; i >= 0; i--) {
 158                temp <<= 16;
 159                temp |= mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR,
 160                                            REG_MII_DATA0 + i);
 161        }
 162
 163        *val = temp;
 164
 165        return 0;
 166}
 167
 168static int b53_mdio_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
 169{
 170        struct mii_bus *bus = dev->priv;
 171        int ret;
 172
 173        ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR,
 174                                   REG_MII_DATA0, value);
 175        if (ret)
 176                return ret;
 177
 178        return b53_mdio_op(dev, page, reg, REG_MII_ADDR_WRITE);
 179}
 180
 181static int b53_mdio_write16(struct b53_device *dev, u8 page, u8 reg,
 182                            u16 value)
 183{
 184        struct mii_bus *bus = dev->priv;
 185        int ret;
 186
 187        ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR,
 188                                   REG_MII_DATA0, value);
 189        if (ret)
 190                return ret;
 191
 192        return b53_mdio_op(dev, page, reg, REG_MII_ADDR_WRITE);
 193}
 194
 195static int b53_mdio_write32(struct b53_device *dev, u8 page, u8 reg,
 196                            u32 value)
 197{
 198        struct mii_bus *bus = dev->priv;
 199        unsigned int i;
 200        u32 temp = value;
 201
 202        for (i = 0; i < 2; i++) {
 203                int ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR,
 204                                               REG_MII_DATA0 + i,
 205                                               temp & 0xffff);
 206                if (ret)
 207                        return ret;
 208                temp >>= 16;
 209        }
 210
 211        return b53_mdio_op(dev, page, reg, REG_MII_ADDR_WRITE);
 212}
 213
 214static int b53_mdio_write48(struct b53_device *dev, u8 page, u8 reg,
 215                            u64 value)
 216{
 217        struct mii_bus *bus = dev->priv;
 218        unsigned int i;
 219        u64 temp = value;
 220
 221        for (i = 0; i < 3; i++) {
 222                int ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR,
 223                                               REG_MII_DATA0 + i,
 224                                               temp & 0xffff);
 225                if (ret)
 226                        return ret;
 227                temp >>= 16;
 228        }
 229
 230        return b53_mdio_op(dev, page, reg, REG_MII_ADDR_WRITE);
 231}
 232
 233static int b53_mdio_write64(struct b53_device *dev, u8 page, u8 reg,
 234                            u64 value)
 235{
 236        struct mii_bus *bus = dev->priv;
 237        unsigned int i;
 238        u64 temp = value;
 239
 240        for (i = 0; i < 4; i++) {
 241                int ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR,
 242                                               REG_MII_DATA0 + i,
 243                                               temp & 0xffff);
 244                if (ret)
 245                        return ret;
 246                temp >>= 16;
 247        }
 248
 249        return b53_mdio_op(dev, page, reg, REG_MII_ADDR_WRITE);
 250}
 251
 252static int b53_mdio_phy_read16(struct b53_device *dev, int addr, int reg,
 253                               u16 *value)
 254{
 255        struct mii_bus *bus = dev->priv;
 256
 257        *value = mdiobus_read_nested(bus, addr, reg);
 258
 259        return 0;
 260}
 261
 262static int b53_mdio_phy_write16(struct b53_device *dev, int addr, int reg,
 263                                u16 value)
 264{
 265        struct mii_bus *bus = dev->bus;
 266
 267        return mdiobus_write_nested(bus, addr, reg, value);
 268}
 269
 270static const struct b53_io_ops b53_mdio_ops = {
 271        .read8 = b53_mdio_read8,
 272        .read16 = b53_mdio_read16,
 273        .read32 = b53_mdio_read32,
 274        .read48 = b53_mdio_read48,
 275        .read64 = b53_mdio_read64,
 276        .write8 = b53_mdio_write8,
 277        .write16 = b53_mdio_write16,
 278        .write32 = b53_mdio_write32,
 279        .write48 = b53_mdio_write48,
 280        .write64 = b53_mdio_write64,
 281        .phy_read16 = b53_mdio_phy_read16,
 282        .phy_write16 = b53_mdio_phy_write16,
 283};
 284
 285#define B53_BRCM_OUI_1  0x0143bc00
 286#define B53_BRCM_OUI_2  0x03625c00
 287#define B53_BRCM_OUI_3  0x00406000
 288#define B53_BRCM_OUI_4  0x01410c00
 289
 290static int b53_mdio_probe(struct mdio_device *mdiodev)
 291{
 292        struct b53_device *dev;
 293        u32 phy_id;
 294        int ret;
 295
 296        /* allow the generic PHY driver to take over the non-management MDIO
 297         * addresses
 298         */
 299        if (mdiodev->addr != BRCM_PSEUDO_PHY_ADDR && mdiodev->addr != 0) {
 300                dev_err(&mdiodev->dev, "leaving address %d to PHY\n",
 301                        mdiodev->addr);
 302                return -ENODEV;
 303        }
 304
 305        /* read the first port's id */
 306        phy_id = mdiobus_read(mdiodev->bus, 0, 2) << 16;
 307        phy_id |= mdiobus_read(mdiodev->bus, 0, 3);
 308
 309        /* BCM5325, BCM539x (OUI_1)
 310         * BCM53125, BCM53128 (OUI_2)
 311         * BCM5365 (OUI_3)
 312         */
 313        if ((phy_id & 0xfffffc00) != B53_BRCM_OUI_1 &&
 314            (phy_id & 0xfffffc00) != B53_BRCM_OUI_2 &&
 315            (phy_id & 0xfffffc00) != B53_BRCM_OUI_3 &&
 316            (phy_id & 0xfffffc00) != B53_BRCM_OUI_4) {
 317                dev_err(&mdiodev->dev, "Unsupported device: 0x%08x\n", phy_id);
 318                return -ENODEV;
 319        }
 320
 321        /* First probe will come from SWITCH_MDIO controller on the 7445D0
 322         * switch, which will conflict with the 7445 integrated switch
 323         * pseudo-phy (we end-up programming both). In that case, we return
 324         * -EPROBE_DEFER for the first time we get here, and wait until we come
 325         * back with the slave MDIO bus which has the correct indirection
 326         * layer setup
 327         */
 328        if (of_machine_is_compatible("brcm,bcm7445d0") &&
 329            strcmp(mdiodev->bus->name, "sf2 slave mii"))
 330                return -EPROBE_DEFER;
 331
 332        dev = b53_switch_alloc(&mdiodev->dev, &b53_mdio_ops, mdiodev->bus);
 333        if (!dev)
 334                return -ENOMEM;
 335
 336        /* we don't use page 0xff, so force a page set */
 337        dev->current_page = 0xff;
 338        dev->bus = mdiodev->bus;
 339
 340        dev_set_drvdata(&mdiodev->dev, dev);
 341
 342        ret = b53_switch_register(dev);
 343        if (ret) {
 344                dev_err(&mdiodev->dev, "failed to register switch: %i\n", ret);
 345                return ret;
 346        }
 347
 348        return ret;
 349}
 350
 351static void b53_mdio_remove(struct mdio_device *mdiodev)
 352{
 353        struct b53_device *dev = dev_get_drvdata(&mdiodev->dev);
 354
 355        if (!dev)
 356                return;
 357
 358        b53_switch_remove(dev);
 359
 360        dev_set_drvdata(&mdiodev->dev, NULL);
 361}
 362
 363static void b53_mdio_shutdown(struct mdio_device *mdiodev)
 364{
 365        struct b53_device *dev = dev_get_drvdata(&mdiodev->dev);
 366
 367        if (!dev)
 368                return;
 369
 370        b53_switch_shutdown(dev);
 371
 372        dev_set_drvdata(&mdiodev->dev, NULL);
 373}
 374
 375static const struct of_device_id b53_of_match[] = {
 376        { .compatible = "brcm,bcm5325" },
 377        { .compatible = "brcm,bcm53115" },
 378        { .compatible = "brcm,bcm53125" },
 379        { .compatible = "brcm,bcm53128" },
 380        { .compatible = "brcm,bcm5365" },
 381        { .compatible = "brcm,bcm5389" },
 382        { .compatible = "brcm,bcm5395" },
 383        { .compatible = "brcm,bcm5397" },
 384        { .compatible = "brcm,bcm5398" },
 385        { /* sentinel */ },
 386};
 387MODULE_DEVICE_TABLE(of, b53_of_match);
 388
 389static struct mdio_driver b53_mdio_driver = {
 390        .probe  = b53_mdio_probe,
 391        .remove = b53_mdio_remove,
 392        .shutdown = b53_mdio_shutdown,
 393        .mdiodrv.driver = {
 394                .name = "bcm53xx",
 395                .of_match_table = b53_of_match,
 396        },
 397};
 398mdio_module_driver(b53_mdio_driver);
 399
 400MODULE_DESCRIPTION("B53 MDIO access driver");
 401MODULE_LICENSE("Dual BSD/GPL");
 402