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 static int ag71xx_mdio_wait_busy(struct ag71xx_mdio *am)
  51 {
  52         int i;
  53
  54         for (i = 0; i < AG71XX_MDIO_RETRY; i++) {
  55                 u32 busy;
  56
  57                 udelay(AG71XX_MDIO_DELAY);
  58
  59                 busy = ag71xx_mdio_rr(am, AG71XX_REG_MII_IND);
  60                 if (!busy)
  61                         return 0;
  62
  63                 udelay(AG71XX_MDIO_DELAY);
  64         }
  65
  66         pr_err("%s: MDIO operation timed out\n", am->mii_bus->name);
  67
  68         return -ETIMEDOUT;
  69 }
  70
  71 int ag71xx_mdio_mii_read(struct ag71xx_mdio *am, int addr, int reg)
  72 {
  73         int err;
  74         int ret;
  75
  76         err = ag71xx_mdio_wait_busy(am);
  77         if (err)
  78                 return 0xffff;
  79
  80         ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
  81         ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
  82                         ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
  83         ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_READ);
  84
  85         err = ag71xx_mdio_wait_busy(am);
  86         if (err)
  87                 return 0xffff;
  88
  89         ret = ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS) & 0xffff;
  90         ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
  91
  92         DBG("mii_read: addr=%04x, reg=%04x, value=%04x\n", addr, reg, ret);
  93
  94         return ret;
  95 }
  96
  97 void ag71xx_mdio_mii_write(struct ag71xx_mdio *am, int addr, int reg, u16 val)
  98 {
  99         DBG("mii_write: addr=%04x, reg=%04x, value=%04x\n", addr, reg, val);
 100
 101         ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
 102                         ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
 103         ag71xx_mdio_wr(am, AG71XX_REG_MII_CTRL, val);
 104
 105         ag71xx_mdio_wait_busy(am);
 106 }
 107
 108 static int ag71xx_mdio_reset(struct mii_bus *bus)
 109 {
 110         struct ag71xx_mdio *am = bus->priv;
 111         u32 t;
 112
 113         if (am->pdata->is_ar7240)
 114                 t = MII_CFG_CLK_DIV_6;
 115         else if (am->pdata->builtin_switch && !am->pdata->is_ar934x)
 116                 t = MII_CFG_CLK_DIV_10;
 117         else if (!am->pdata->builtin_switch && am->pdata->is_ar934x)
 118                 t = MII_CFG_CLK_DIV_58;
 119         else
 120                 t = MII_CFG_CLK_DIV_28;
 121
 122         ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t | MII_CFG_RESET);
 123         udelay(100);
 124
 125         ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t);
 126         udelay(100);
 127
 128         return 0;
 129 }
 130
 131 static int ag71xx_mdio_read(struct mii_bus *bus, int addr, int reg)
 132 {
 133         struct ag71xx_mdio *am = bus->priv;
 134
 135         if (am->pdata->builtin_switch)
 136                 return ar7240sw_phy_read(bus, addr, reg);
 137         else
 138                 return ag71xx_mdio_mii_read(am, addr, reg);
 139 }
 140
 141 static int ag71xx_mdio_write(struct mii_bus *bus, int addr, int reg, u16 val)
 142 {
 143         struct ag71xx_mdio *am = bus->priv;
 144
 145         if (am->pdata->builtin_switch)
 146                 ar7240sw_phy_write(bus, addr, reg, val);
 147         else
 148                 ag71xx_mdio_mii_write(am, addr, reg, val);
 149         return 0;
 150 }
 151
 152 static int __devinit ag71xx_mdio_probe(struct platform_device *pdev)
 153 {
 154         struct ag71xx_mdio_platform_data *pdata;
 155         struct ag71xx_mdio *am;
 156         struct resource *res;
 157         int i;
 158         int err;
 159
 160         pdata = pdev->dev.platform_data;
 161         if (!pdata) {
 162                 dev_err(&pdev->dev, "no platform data specified\n");
 163                 return -EINVAL;
 164         }
 165
 166         am = kzalloc(sizeof(*am), GFP_KERNEL);
 167         if (!am) {
 168                 err = -ENOMEM;
 169                 goto err_out;
 170         }
 171
 172         am->pdata = pdata;
 173
 174         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 175         if (!res) {
 176                 dev_err(&pdev->dev, "no iomem resource found\n");
 177                 err = -ENXIO;
 178                 goto err_out;
 179         }
 180
 181         am->mdio_base = ioremap_nocache(res->start, res->end - res->start + 1);
 182         if (!am->mdio_base) {
 183                 dev_err(&pdev->dev, "unable to ioremap registers\n");
 184                 err = -ENOMEM;
 185                 goto err_free_mdio;
 186         }
 187
 188         am->mii_bus = mdiobus_alloc();
 189         if (am->mii_bus == NULL) {
 190                 err = -ENOMEM;
 191                 goto err_iounmap;
 192         }
 193
 194         am->mii_bus->name = "ag71xx_mdio";
 195         am->mii_bus->read = ag71xx_mdio_read;
 196         am->mii_bus->write = ag71xx_mdio_write;
 197         am->mii_bus->reset = ag71xx_mdio_reset;
 198         am->mii_bus->irq = am->mii_irq;
 199         am->mii_bus->priv = am;
 200         am->mii_bus->parent = &pdev->dev;
 201         snprintf(am->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(&pdev->dev));
 202         am->mii_bus->phy_mask = pdata->phy_mask;
 203
 204         for (i = 0; i < PHY_MAX_ADDR; i++)
 205                 am->mii_irq[i] = PHY_POLL;
 206
 207         ag71xx_mdio_wr(am, AG71XX_REG_MAC_CFG1, 0);
 208
 209         err = mdiobus_register(am->mii_bus);
 210         if (err)
 211                 goto err_free_bus;
 212
 213         ag71xx_mdio_dump_regs(am);
 214
 215         platform_set_drvdata(pdev, am);
 216         return 0;
 217
 218 err_free_bus:
 219         mdiobus_free(am->mii_bus);
 220 err_iounmap:
 221         iounmap(am->mdio_base);
 222 err_free_mdio:
 223         kfree(am);
 224 err_out:
 225         return err;
 226 }
 227
 228 static int __devexit ag71xx_mdio_remove(struct platform_device *pdev)
 229 {
 230         struct ag71xx_mdio *am = platform_get_drvdata(pdev);
 231
 232         if (am) {
 233                 mdiobus_unregister(am->mii_bus);
 234                 mdiobus_free(am->mii_bus);
 235                 iounmap(am->mdio_base);
 236                 kfree(am);
 237                 platform_set_drvdata(pdev, NULL);
 238         }
 239
 240         return 0;
 241 }
 242
 243 static struct platform_driver ag71xx_mdio_driver = {
 244         .probe          = ag71xx_mdio_probe,
 245         .remove         = __exit_p(ag71xx_mdio_remove),
 246         .driver = {
 247                 .name   = "ag71xx-mdio",
 248         }
 249 };
 250
 251 int __init ag71xx_mdio_driver_init(void)
 252 {
 253         return platform_driver_register(&ag71xx_mdio_driver);
 254 }
 255
 256 void ag71xx_mdio_driver_exit(void)
 257 {
 258         platform_driver_unregister(&ag71xx_mdio_driver);
 259 }