drivers/net/phy/fixed.c

   1 /*
   2  * Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
   3  *
   4  * Author: Vitaly Bordug <vbordug@ru.mvista.com>
   5  *         Anton Vorontsov <avorontsov@ru.mvista.com>
   6  *
   7  * Copyright (c) 2006-2007 MontaVista Software, Inc.
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/list.h>
  19 #include <linux/mii.h>
  20 #include <linux/phy.h>
  21 #include <linux/phy_fixed.h>
  22 #include <linux/err.h>
  23 #include <linux/slab.h>
  24
  25 #define MII_REGS_NUM 29
  26
  27 struct fixed_mdio_bus {
  28         int irqs[PHY_MAX_ADDR];
  29         struct mii_bus *mii_bus;
  30         struct list_head phys;
  31 };
  32
  33 struct fixed_phy {
  34         int id;
  35         u16 regs[MII_REGS_NUM];
  36         struct phy_device *phydev;
  37         struct fixed_phy_status status;
  38         int (*link_update)(struct net_device *, struct fixed_phy_status *);
  39         struct list_head node;
  40 };
  41
  42 static struct platform_device *pdev;
  43 static struct fixed_mdio_bus platform_fmb = {
  44         .phys = LIST_HEAD_INIT(platform_fmb.phys),
  45 };
  46
  47 static int fixed_phy_update_regs(struct fixed_phy *fp)
  48 {
  49         u16 bmsr = BMSR_ANEGCAPABLE;
  50         u16 bmcr = 0;
  51         u16 lpagb = 0;
  52         u16 lpa = 0;
  53
  54         if (fp->status.duplex) {
  55                 bmcr |= BMCR_FULLDPLX;
  56
  57                 switch (fp->status.speed) {
  58                 case 1000:
  59                         bmsr |= BMSR_ESTATEN;
  60                         bmcr |= BMCR_SPEED1000;
  61                         lpagb |= LPA_1000FULL;
  62                         break;
  63                 case 100:
  64                         bmsr |= BMSR_100FULL;
  65                         bmcr |= BMCR_SPEED100;
  66                         lpa |= LPA_100FULL;
  67                         break;
  68                 case 10:
  69                         bmsr |= BMSR_10FULL;
  70                         lpa |= LPA_10FULL;
  71                         break;
  72                 default:
  73                         printk(KERN_WARNING "fixed phy: unknown speed\n");
  74                         return -EINVAL;
  75                 }
  76         } else {
  77                 switch (fp->status.speed) {
  78                 case 1000:
  79                         bmsr |= BMSR_ESTATEN;
  80                         bmcr |= BMCR_SPEED1000;
  81                         lpagb |= LPA_1000HALF;
  82                         break;
  83                 case 100:
  84                         bmsr |= BMSR_100HALF;
  85                         bmcr |= BMCR_SPEED100;
  86                         lpa |= LPA_100HALF;
  87                         break;
  88                 case 10:
  89                         bmsr |= BMSR_10HALF;
  90                         lpa |= LPA_10HALF;
  91                         break;
  92                 default:
  93                         printk(KERN_WARNING "fixed phy: unknown speed\n");
  94                         return -EINVAL;
  95                 }
  96         }
  97
  98         if (fp->status.link)
  99                 bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
 100
 101         if (fp->status.pause)
 102                 lpa |= LPA_PAUSE_CAP;
 103
 104         if (fp->status.asym_pause)
 105                 lpa |= LPA_PAUSE_ASYM;
 106
 107         fp->regs[MII_PHYSID1] = fp->id >> 16;
 108         fp->regs[MII_PHYSID2] = fp->id;
 109
 110         fp->regs[MII_BMSR] = bmsr;
 111         fp->regs[MII_BMCR] = bmcr;
 112         fp->regs[MII_LPA] = lpa;
 113         fp->regs[MII_STAT1000] = lpagb;
 114
 115         return 0;
 116 }
 117
 118 static int fixed_mdio_read(struct mii_bus *bus, int phy_id, int reg_num)
 119 {
 120         struct fixed_mdio_bus *fmb = bus->priv;
 121         struct fixed_phy *fp;
 122
 123         if (reg_num >= MII_REGS_NUM)
 124                 return -1;
 125
 126         list_for_each_entry(fp, &fmb->phys, node) {
 127                 if (fp->id == phy_id) {
 128                         /* Issue callback if user registered it. */
 129                         if (fp->link_update) {
 130                                 fp->link_update(fp->phydev->attached_dev,
 131                                                 &fp->status);
 132                                 fixed_phy_update_regs(fp);
 133                         }
 134                         return fp->regs[reg_num];
 135                 }
 136         }
 137
 138         return 0xFFFF;
 139 }
 140
 141 static int fixed_mdio_write(struct mii_bus *bus, int phy_id, int reg_num,
 142                             u16 val)
 143 {
 144         return 0;
 145 }
 146
 147 /*
 148  * If something weird is required to be done with link/speed,
 149  * network driver is able to assign a function to implement this.
 150  * May be useful for PHY's that need to be software-driven.
 151  */
 152 int fixed_phy_set_link_update(struct phy_device *phydev,
 153                               int (*link_update)(struct net_device *,
 154                                                  struct fixed_phy_status *))
 155 {
 156         struct fixed_mdio_bus *fmb = &platform_fmb;
 157         struct fixed_phy *fp;
 158
 159         if (!link_update || !phydev || !phydev->bus)
 160                 return -EINVAL;
 161
 162         list_for_each_entry(fp, &fmb->phys, node) {
 163                 if (fp->id == phydev->phy_id) {
 164                         fp->link_update = link_update;
 165                         fp->phydev = phydev;
 166                         return 0;
 167                 }
 168         }
 169
 170         return -ENOENT;
 171 }
 172 EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
 173
 174 int fixed_phy_add(unsigned int irq, int phy_id,
 175                   struct fixed_phy_status *status)
 176 {
 177         int ret;
 178         struct fixed_mdio_bus *fmb = &platform_fmb;
 179         struct fixed_phy *fp;
 180
 181         fp = kzalloc(sizeof(*fp), GFP_KERNEL);
 182         if (!fp)
 183                 return -ENOMEM;
 184
 185         memset(fp->regs, 0xFF,  sizeof(fp->regs[0]) * MII_REGS_NUM);
 186
 187         fmb->irqs[phy_id] = irq;
 188
 189         fp->id = phy_id;
 190         fp->status = *status;
 191
 192         ret = fixed_phy_update_regs(fp);
 193         if (ret)
 194                 goto err_regs;
 195
 196         list_add_tail(&fp->node, &fmb->phys);
 197
 198         return 0;
 199
 200 err_regs:
 201         kfree(fp);
 202         return ret;
 203 }
 204 EXPORT_SYMBOL_GPL(fixed_phy_add);
 205
 206 static int __init fixed_mdio_bus_init(void)
 207 {
 208         struct fixed_mdio_bus *fmb = &platform_fmb;
 209         int ret;
 210
 211         pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
 212         if (IS_ERR(pdev)) {
 213                 ret = PTR_ERR(pdev);
 214                 goto err_pdev;
 215         }
 216
 217         fmb->mii_bus = mdiobus_alloc();
 218         if (fmb->mii_bus == NULL) {
 219                 ret = -ENOMEM;
 220                 goto err_mdiobus_reg;
 221         }
 222
 223         snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
 224         fmb->mii_bus->name = "Fixed MDIO Bus";
 225         fmb->mii_bus->priv = fmb;
 226         fmb->mii_bus->parent = &pdev->dev;
 227         fmb->mii_bus->read = &fixed_mdio_read;
 228         fmb->mii_bus->write = &fixed_mdio_write;
 229         fmb->mii_bus->irq = fmb->irqs;
 230
 231         ret = mdiobus_register(fmb->mii_bus);
 232         if (ret)
 233                 goto err_mdiobus_alloc;
 234
 235         return 0;
 236
 237 err_mdiobus_alloc:
 238         mdiobus_free(fmb->mii_bus);
 239 err_mdiobus_reg:
 240         platform_device_unregister(pdev);
 241 err_pdev:
 242         return ret;
 243 }
 244 module_init(fixed_mdio_bus_init);
 245
 246 static void __exit fixed_mdio_bus_exit(void)
 247 {
 248         struct fixed_mdio_bus *fmb = &platform_fmb;
 249         struct fixed_phy *fp, *tmp;
 250
 251         mdiobus_unregister(fmb->mii_bus);
 252         mdiobus_free(fmb->mii_bus);
 253         platform_device_unregister(pdev);
 254
 255         list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
 256                 list_del(&fp->node);
 257                 kfree(fp);
 258         }
 259 }
 260 module_exit(fixed_mdio_bus_exit);
 261
 262 MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
 263 MODULE_AUTHOR("Vitaly Bordug");
 264 MODULE_LICENSE("GPL");