2 * Atheros AR71xx built-in ethernet mac driver
4 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 * Based on Atheros' AG7100 driver
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.
16 #define AG71XX_MDIO_RETRY 1000
17 #define AG71XX_MDIO_DELAY 5
19 struct ag71xx_mdio *ag71xx_mdio_bus;
21 static inline void ag71xx_mdio_wr(struct ag71xx_mdio *am, unsigned reg,
26 r = am->mdio_base + reg;
27 __raw_writel(value, r);
30 (void) __raw_readl(r);
33 static inline u32 ag71xx_mdio_rr(struct ag71xx_mdio *am, unsigned reg)
35 return __raw_readl(am->mdio_base + reg);
38 static void ag71xx_mdio_dump_regs(struct ag71xx_mdio *am)
40 DBG("%s: mii_cfg=%08x, mii_cmd=%08x, mii_addr=%08x\n",
42 ag71xx_mdio_rr(am, AG71XX_REG_MII_CFG),
43 ag71xx_mdio_rr(am, AG71XX_REG_MII_CMD),
44 ag71xx_mdio_rr(am, AG71XX_REG_MII_ADDR));
45 DBG("%s: mii_ctrl=%08x, mii_status=%08x, mii_ind=%08x\n",
47 ag71xx_mdio_rr(am, AG71XX_REG_MII_CTRL),
48 ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS),
49 ag71xx_mdio_rr(am, AG71XX_REG_MII_IND));
52 static int ag71xx_mdio_mii_read(struct ag71xx_mdio *am, int addr, int reg)
57 ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
58 ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
59 ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
60 ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_READ);
62 i = AG71XX_MDIO_RETRY;
63 while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
65 printk(KERN_ERR "%s: mii_read timed out\n",
70 udelay(AG71XX_MDIO_DELAY);
73 ret = ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS) & 0xffff;
74 ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
76 DBG("mii_read: addr=%04x, reg=%04x, value=%04x\n", addr, reg, ret);
82 static void ag71xx_mdio_mii_write(struct ag71xx_mdio *am,
83 int addr, int reg, u16 val)
87 DBG("mii_write: addr=%04x, reg=%04x, value=%04x\n", addr, reg, val);
89 ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
90 ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
91 ag71xx_mdio_wr(am, AG71XX_REG_MII_CTRL, val);
93 i = AG71XX_MDIO_RETRY;
94 while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
96 printk(KERN_ERR "%s: mii_write timed out\n",
100 udelay(AG71XX_MDIO_DELAY);
104 static int ag71xx_mdio_reset(struct mii_bus *bus)
106 struct ag71xx_mdio *am = bus->priv;
108 ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, MII_CFG_RESET);
111 ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, MII_CFG_CLK_DIV_28);
117 static int ag71xx_mdio_read(struct mii_bus *bus, int addr, int reg)
119 struct ag71xx_mdio *am = bus->priv;
121 return ag71xx_mdio_mii_read(am, addr, reg);
124 static int ag71xx_mdio_write(struct mii_bus *bus, int addr, int reg, u16 val)
126 struct ag71xx_mdio *am = bus->priv;
128 ag71xx_mdio_mii_write(am, addr, reg, val);
132 static int __init ag71xx_mdio_probe(struct platform_device *pdev)
134 struct ag71xx_mdio_platform_data *pdata;
135 struct ag71xx_mdio *am;
136 struct resource *res;
143 am = kzalloc(sizeof(*am), GFP_KERNEL);
149 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
151 dev_err(&pdev->dev, "no iomem resource found\n");
156 am->mdio_base = ioremap_nocache(res->start, res->end - res->start + 1);
157 if (!am->mdio_base) {
158 dev_err(&pdev->dev, "unable to ioremap registers\n");
163 am->mii_bus = mdiobus_alloc();
164 if (am->mii_bus == NULL) {
169 am->mii_bus->name = "ag71xx_mdio";
170 am->mii_bus->read = ag71xx_mdio_read;
171 am->mii_bus->write = ag71xx_mdio_write;
172 am->mii_bus->reset = ag71xx_mdio_reset;
173 am->mii_bus->irq = am->mii_irq;
174 am->mii_bus->priv = am;
175 am->mii_bus->parent = &pdev->dev;
176 snprintf(am->mii_bus->id, MII_BUS_ID_SIZE, "%x", 0);
178 pdata = pdev->dev.platform_data;
180 am->mii_bus->phy_mask = pdata->phy_mask;
182 for (i = 0; i < PHY_MAX_ADDR; i++)
183 am->mii_irq[i] = PHY_POLL;
185 ag71xx_mdio_wr(am, AG71XX_REG_MAC_CFG1, 0);
187 err = mdiobus_register(am->mii_bus);
191 ag71xx_mdio_dump_regs(am);
193 platform_set_drvdata(pdev, am);
194 ag71xx_mdio_bus = am;
198 mdiobus_free(am->mii_bus);
200 iounmap(am->mdio_base);
207 static int __exit ag71xx_mdio_remove(struct platform_device *pdev)
209 struct ag71xx_mdio *am = platform_get_drvdata(pdev);
212 ag71xx_mdio_bus = NULL;
213 mdiobus_unregister(am->mii_bus);
214 mdiobus_free(am->mii_bus);
215 iounmap(am->mdio_base);
217 platform_set_drvdata(pdev, NULL);
223 static struct platform_driver ag71xx_mdio_driver = {
224 .probe = ag71xx_mdio_probe,
225 .remove = __exit_p(ag71xx_mdio_remove),
227 .name = "ag71xx-mdio",
231 int ag71xx_mdio_driver_init(void)
233 return platform_driver_register(&ag71xx_mdio_driver);
236 void ag71xx_mdio_driver_exit(void)
238 platform_driver_unregister(&ag71xx_mdio_driver);