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