target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_mdio.c

   1 /*
   2  *  Atheros AR71xx built-in ethernet mac driver
   3  *
   4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  Based on Atheros' AG7100 driver
   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 version 2 as published
  11  *  by the Free Software Foundation.
  12  */
  13
  14 #include "ag71xx.h"
  15
  16 #define AG71XX_MDIO_RETRY       1000
  17 #define AG71XX_MDIO_DELAY       5
  18
  19 static inline void ag71xx_mdio_wr(struct ag71xx_mdio *am, unsigned reg,
  20                                   u32 value)
  21 {
  22         void __iomem *r;
  23
  24         r = am->mdio_base + reg;
  25         __raw_writel(value, r);
  26
  27         /* flush write */
  28         (void) __raw_readl(r);
  29 }
  30
  31 static inline u32 ag71xx_mdio_rr(struct ag71xx_mdio *am, unsigned reg)
  32 {
  33         return __raw_readl(am->mdio_base + reg);
  34 }
  35
  36 static void ag71xx_mdio_dump_regs(struct ag71xx_mdio *am)
  37 {
  38         DBG("%s: mii_cfg=%08x, mii_cmd=%08x, mii_addr=%08x\n",
  39                 am->mii_bus->name,
  40                 ag71xx_mdio_rr(am, AG71XX_REG_MII_CFG),
  41                 ag71xx_mdio_rr(am, AG71XX_REG_MII_CMD),
  42                 ag71xx_mdio_rr(am, AG71XX_REG_MII_ADDR));
  43         DBG("%s: mii_ctrl=%08x, mii_status=%08x, mii_ind=%08x\n",
  44                 am->mii_bus->name,
  45                 ag71xx_mdio_rr(am, AG71XX_REG_MII_CTRL),
  46                 ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS),
  47                 ag71xx_mdio_rr(am, AG71XX_REG_MII_IND));
  48 }
  49
  50 int ag71xx_mdio_mii_read(struct ag71xx_mdio *am, int addr, int reg)
  51 {
  52         int ret;
  53         int i;
  54
  55         ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
  56         ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
  57                         ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
  58         ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_READ);
  59
  60         i = AG71XX_MDIO_RETRY;
  61         while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
  62                 if (i-- == 0) {
  63                         pr_err("%s: mii_read timed out\n", am->mii_bus->name);
  64                         ret = 0xffff;
  65                         goto out;
  66                 }
  67                 udelay(AG71XX_MDIO_DELAY);
  68         }
  69
  70         ret = ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS) & 0xffff;
  71         ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
  72
  73         DBG("mii_read: addr=%04x, reg=%04x, value=%04x\n", addr, reg, ret);
  74
  75 out:
  76         return ret;
  77 }
  78
  79 void ag71xx_mdio_mii_write(struct ag71xx_mdio *am, int addr, int reg, u16 val)
  80 {
  81         int i;
  82
  83         DBG("mii_write: addr=%04x, reg=%04x, value=%04x\n", addr, reg, val);
  84
  85         ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
  86                         ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
  87         ag71xx_mdio_wr(am, AG71XX_REG_MII_CTRL, val);
  88
  89         i = AG71XX_MDIO_RETRY;
  90         while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
  91                 if (i-- == 0) {
  92                         pr_err("%s: mii_write timed out\n", am->mii_bus->name);
  93                         break;
  94                 }
  95                 udelay(AG71XX_MDIO_DELAY);
  96         }
  97 }
  98
  99 static int ag71xx_mdio_reset(struct mii_bus *bus)
 100 {
 101         struct ag71xx_mdio *am = bus->priv;
 102         u32 t;
 103
 104         if (am->pdata->is_ar7240)
 105                 t = MII_CFG_CLK_DIV_6;
 106         else
 107                 t = MII_CFG_CLK_DIV_28;
 108
 109         ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t | MII_CFG_RESET);
 110         udelay(100);
 111
 112         ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t);
 113         udelay(100);
 114
 115         return 0;
 116 }
 117
 118 static int ag71xx_mdio_read(struct mii_bus *bus, int addr, int reg)
 119 {
 120         struct ag71xx_mdio *am = bus->priv;
 121
 122         if (am->pdata->is_ar7240)
 123                 return ar7240sw_phy_read(bus, addr, reg);
 124         else
 125                 return ag71xx_mdio_mii_read(am, addr, reg);
 126 }
 127
 128 static int ag71xx_mdio_write(struct mii_bus *bus, int addr, int reg, u16 val)
 129 {
 130         struct ag71xx_mdio *am = bus->priv;
 131
 132         if (am->pdata->is_ar7240)
 133                 ar7240sw_phy_write(bus, addr, reg, val);
 134         else
 135                 ag71xx_mdio_mii_write(am, addr, reg, val);
 136         return 0;
 137 }
 138
 139 static int __devinit ag71xx_mdio_probe(struct platform_device *pdev)
 140 {
 141         struct ag71xx_mdio_platform_data *pdata;
 142         struct ag71xx_mdio *am;
 143         struct resource *res;
 144         int i;
 145         int err;
 146
 147         pdata = pdev->dev.platform_data;
 148         if (!pdata) {
 149                 dev_err(&pdev->dev, "no platform data specified\n");
 150                 return -EINVAL;
 151         }
 152
 153         am = kzalloc(sizeof(*am), GFP_KERNEL);
 154         if (!am) {
 155                 err = -ENOMEM;
 156                 goto err_out;
 157         }
 158
 159         am->pdata = pdata;
 160
 161         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 162         if (!res) {
 163                 dev_err(&pdev->dev, "no iomem resource found\n");
 164                 err = -ENXIO;
 165                 goto err_out;
 166         }
 167
 168         am->mdio_base = ioremap_nocache(res->start, res->end - res->start + 1);
 169         if (!am->mdio_base) {
 170                 dev_err(&pdev->dev, "unable to ioremap registers\n");
 171                 err = -ENOMEM;
 172                 goto err_free_mdio;
 173         }
 174
 175         am->mii_bus = mdiobus_alloc();
 176         if (am->mii_bus == NULL) {
 177                 err = -ENOMEM;
 178                 goto err_iounmap;
 179         }
 180
 181         am->mii_bus->name = "ag71xx_mdio";
 182         am->mii_bus->read = ag71xx_mdio_read;
 183         am->mii_bus->write = ag71xx_mdio_write;
 184         am->mii_bus->reset = ag71xx_mdio_reset;
 185         am->mii_bus->irq = am->mii_irq;
 186         am->mii_bus->priv = am;
 187         am->mii_bus->parent = &pdev->dev;
 188         snprintf(am->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(&pdev->dev));
 189         am->mii_bus->phy_mask = pdata->phy_mask;
 190
 191         for (i = 0; i < PHY_MAX_ADDR; i++)
 192                 am->mii_irq[i] = PHY_POLL;
 193
 194         ag71xx_mdio_wr(am, AG71XX_REG_MAC_CFG1, 0);
 195
 196         err = mdiobus_register(am->mii_bus);
 197         if (err)
 198                 goto err_free_bus;
 199
 200         ag71xx_mdio_dump_regs(am);
 201
 202         platform_set_drvdata(pdev, am);
 203         return 0;
 204
 205 err_free_bus:
 206         mdiobus_free(am->mii_bus);
 207 err_iounmap:
 208         iounmap(am->mdio_base);
 209 err_free_mdio:
 210         kfree(am);
 211 err_out:
 212         return err;
 213 }
 214
 215 static int __devexit ag71xx_mdio_remove(struct platform_device *pdev)
 216 {
 217         struct ag71xx_mdio *am = platform_get_drvdata(pdev);
 218
 219         if (am) {
 220                 mdiobus_unregister(am->mii_bus);
 221                 mdiobus_free(am->mii_bus);
 222                 iounmap(am->mdio_base);
 223                 kfree(am);
 224                 platform_set_drvdata(pdev, NULL);
 225         }
 226
 227         return 0;
 228 }
 229
 230 static struct platform_driver ag71xx_mdio_driver = {
 231         .probe          = ag71xx_mdio_probe,
 232         .remove         = __exit_p(ag71xx_mdio_remove),
 233         .driver = {
 234                 .name   = "ag71xx-mdio",
 235         }
 236 };
 237
 238 int __init ag71xx_mdio_driver_init(void)
 239 {
 240         return platform_driver_register(&ag71xx_mdio_driver);
 241 }
 242
 243 void ag71xx_mdio_driver_exit(void)
 244 {
 245         platform_driver_unregister(&ag71xx_mdio_driver);
 246 }