2 * Atheros AR71xx built-in ethernet mac driver
4 * Copyright (C) 2008-2010 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 static inline void ag71xx_mdio_wr(struct ag71xx_mdio *am, unsigned reg,
24 r = am->mdio_base + reg;
25 __raw_writel(value, r);
28 (void) __raw_readl(r);
31 static inline u32 ag71xx_mdio_rr(struct ag71xx_mdio *am, unsigned reg)
33 return __raw_readl(am->mdio_base + reg);
36 static void ag71xx_mdio_dump_regs(struct ag71xx_mdio *am)
38 DBG("%s: mii_cfg=%08x, mii_cmd=%08x, mii_addr=%08x\n",
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",
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));
50 int ag71xx_mdio_mii_read(struct ag71xx_mdio *am, int addr, int reg)
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);
60 i = AG71XX_MDIO_RETRY;
61 while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
63 pr_err("%s: mii_read timed out\n", am->mii_bus->name);
67 udelay(AG71XX_MDIO_DELAY);
70 ret = ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS) & 0xffff;
71 ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
73 DBG("mii_read: addr=%04x, reg=%04x, value=%04x\n", addr, reg, ret);
79 void ag71xx_mdio_mii_write(struct ag71xx_mdio *am, int addr, int reg, u16 val)
83 DBG("mii_write: addr=%04x, reg=%04x, value=%04x\n", addr, reg, val);
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);
89 i = AG71XX_MDIO_RETRY;
90 while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
92 pr_err("%s: mii_write timed out\n", am->mii_bus->name);
95 udelay(AG71XX_MDIO_DELAY);
99 static int ag71xx_mdio_reset(struct mii_bus *bus)
101 struct ag71xx_mdio *am = bus->priv;
104 if (am->pdata->is_ar7240)
105 t = MII_CFG_CLK_DIV_6;
106 else if (am->pdata->builtin_switch && !am->pdata->is_ar934x)
107 t = MII_CFG_CLK_DIV_10;
108 else if (!am->pdata->builtin_switch && am->pdata->is_ar934x)
109 t = MII_CFG_CLK_DIV_58;
111 t = MII_CFG_CLK_DIV_28;
113 ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t | MII_CFG_RESET);
116 ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t);
122 static int ag71xx_mdio_read(struct mii_bus *bus, int addr, int reg)
124 struct ag71xx_mdio *am = bus->priv;
126 if (am->pdata->builtin_switch)
127 return ar7240sw_phy_read(bus, addr, reg);
129 return ag71xx_mdio_mii_read(am, addr, reg);
132 static int ag71xx_mdio_write(struct mii_bus *bus, int addr, int reg, u16 val)
134 struct ag71xx_mdio *am = bus->priv;
136 if (am->pdata->builtin_switch)
137 ar7240sw_phy_write(bus, addr, reg, val);
139 ag71xx_mdio_mii_write(am, addr, reg, val);
143 static int __devinit ag71xx_mdio_probe(struct platform_device *pdev)
145 struct ag71xx_mdio_platform_data *pdata;
146 struct ag71xx_mdio *am;
147 struct resource *res;
151 pdata = pdev->dev.platform_data;
153 dev_err(&pdev->dev, "no platform data specified\n");
157 am = kzalloc(sizeof(*am), GFP_KERNEL);
165 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
167 dev_err(&pdev->dev, "no iomem resource found\n");
172 am->mdio_base = ioremap_nocache(res->start, res->end - res->start + 1);
173 if (!am->mdio_base) {
174 dev_err(&pdev->dev, "unable to ioremap registers\n");
179 am->mii_bus = mdiobus_alloc();
180 if (am->mii_bus == NULL) {
185 am->mii_bus->name = "ag71xx_mdio";
186 am->mii_bus->read = ag71xx_mdio_read;
187 am->mii_bus->write = ag71xx_mdio_write;
188 am->mii_bus->reset = ag71xx_mdio_reset;
189 am->mii_bus->irq = am->mii_irq;
190 am->mii_bus->priv = am;
191 am->mii_bus->parent = &pdev->dev;
192 snprintf(am->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(&pdev->dev));
193 am->mii_bus->phy_mask = pdata->phy_mask;
195 for (i = 0; i < PHY_MAX_ADDR; i++)
196 am->mii_irq[i] = PHY_POLL;
198 ag71xx_mdio_wr(am, AG71XX_REG_MAC_CFG1, 0);
200 err = mdiobus_register(am->mii_bus);
204 ag71xx_mdio_dump_regs(am);
206 platform_set_drvdata(pdev, am);
210 mdiobus_free(am->mii_bus);
212 iounmap(am->mdio_base);
219 static int __devexit ag71xx_mdio_remove(struct platform_device *pdev)
221 struct ag71xx_mdio *am = platform_get_drvdata(pdev);
224 mdiobus_unregister(am->mii_bus);
225 mdiobus_free(am->mii_bus);
226 iounmap(am->mdio_base);
228 platform_set_drvdata(pdev, NULL);
234 static struct platform_driver ag71xx_mdio_driver = {
235 .probe = ag71xx_mdio_probe,
236 .remove = __exit_p(ag71xx_mdio_remove),
238 .name = "ag71xx-mdio",
242 int __init ag71xx_mdio_driver_init(void)
244 return platform_driver_register(&ag71xx_mdio_driver);
247 void ag71xx_mdio_driver_exit(void)
249 platform_driver_unregister(&ag71xx_mdio_driver);