2 * Atheros AR71xx built-in ethernet mac driver
4 * Copyright (C) 2008 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,
24 __raw_writel(value, am->mdio_base + reg - AG71XX_REG_MII_CFG);
27 static inline u32 ag71xx_mdio_rr(struct ag71xx_mdio *am, unsigned reg)
29 return __raw_readl(am->mdio_base + reg - AG71XX_REG_MII_CFG);
32 static void ag71xx_mdio_dump_regs(struct ag71xx_mdio *am)
34 DBG("%s: mii_cfg=%08x, mii_cmd=%08x, mii_addr=%08x\n",
36 ag71xx_mdio_rr(am, AG71XX_REG_MII_CFG),
37 ag71xx_mdio_rr(am, AG71XX_REG_MII_CMD),
38 ag71xx_mdio_rr(am, AG71XX_REG_MII_ADDR));
39 DBG("%s: mii_ctrl=%08x, mii_status=%08x, mii_ind=%08x\n",
41 ag71xx_mdio_rr(am, AG71XX_REG_MII_CTRL),
42 ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS),
43 ag71xx_mdio_rr(am, AG71XX_REG_MII_IND));
46 static int ag71xx_mdio_mii_read(struct ag71xx_mdio *am, int addr, int reg)
51 ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
52 ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
53 ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
54 ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_READ);
56 i = AG71XX_MDIO_RETRY;
57 while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
59 printk(KERN_ERR "%s: mii_read timed out\n",
64 udelay(AG71XX_MDIO_DELAY);
67 ret = ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS) & 0xffff;
68 ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
70 DBG("mii_read: addr=%04x, reg=%04x, value=%04x\n", addr, reg, ret);
76 static void ag71xx_mdio_mii_write(struct ag71xx_mdio *am,
77 int addr, int reg, u16 val)
81 DBG("mii_write: addr=%04x, reg=%04x, value=%04x\n", addr, reg, val);
83 ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
84 ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
85 ag71xx_mdio_wr(am, AG71XX_REG_MII_CTRL, val);
87 i = AG71XX_MDIO_RETRY;
88 while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
90 printk(KERN_ERR "%s: mii_write timed out\n",
94 udelay(AG71XX_MDIO_DELAY);
98 static int ag71xx_mdio_reset(struct mii_bus *bus)
100 struct ag71xx_mdio *am = bus->priv;
102 ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, MII_CFG_RESET);
105 ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, MII_CFG_CLK_DIV_28);
111 static int ag71xx_mdio_read(struct mii_bus *bus, int addr, int reg)
113 struct ag71xx_mdio *am = bus->priv;
115 return ag71xx_mdio_mii_read(am, addr, reg);
118 static int ag71xx_mdio_write(struct mii_bus *bus, int addr, int reg, u16 val)
120 struct ag71xx_mdio *am = bus->priv;
122 ag71xx_mdio_mii_write(am, addr, reg, val);
126 static int __init ag71xx_mdio_probe(struct platform_device *pdev)
128 struct ag71xx_mdio_platform_data *pdata;
129 struct ag71xx_mdio *am;
130 struct resource *res;
137 am = kzalloc(sizeof(*am), GFP_KERNEL);
143 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
145 dev_err(&pdev->dev, "no iomem resource found\n");
150 am->mdio_base = ioremap_nocache(res->start, res->end - res->start + 1);
151 if (!am->mdio_base) {
152 dev_err(&pdev->dev, "unable to ioremap registers\n");
157 am->mii_bus.name = "ag71xx_mdio";
158 am->mii_bus.read = ag71xx_mdio_read;
159 am->mii_bus.write = ag71xx_mdio_write;
160 am->mii_bus.reset = ag71xx_mdio_reset;
161 am->mii_bus.irq = am->mii_irq;
162 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
165 snprintf(am->mii_bus.id, MII_BUS_ID_SIZE, "%x", 0);
167 am->mii_bus.priv = am;
168 am->mii_bus.dev = &pdev->dev;
170 pdata = pdev->dev.platform_data;
172 am->mii_bus.phy_mask = pdata->phy_mask;
174 for (i = 0; i < PHY_MAX_ADDR; i++)
175 am->mii_irq[i] = PHY_POLL;
177 err = mdiobus_register(&am->mii_bus);
181 ag71xx_mdio_dump_regs(am);
183 platform_set_drvdata(pdev, am);
184 ag71xx_mdio_bus = am;
188 iounmap(am->mdio_base);
195 static int __exit ag71xx_mdio_remove(struct platform_device *pdev)
197 struct ag71xx_mdio *am = platform_get_drvdata(pdev);
200 ag71xx_mdio_bus = NULL;
201 mdiobus_unregister(&am->mii_bus);
202 iounmap(am->mdio_base);
204 platform_set_drvdata(pdev, NULL);
210 static struct platform_driver ag71xx_mdio_driver = {
211 .probe = ag71xx_mdio_probe,
212 .remove = __exit_p(ag71xx_mdio_remove),
214 .name = "ag71xx-mdio",
218 int ag71xx_mdio_driver_init(void)
220 return platform_driver_register(&ag71xx_mdio_driver);
223 void ag71xx_mdio_driver_exit(void)
225 platform_driver_unregister(&ag71xx_mdio_driver);