1 files changed, 315 insertions, 0 deletions

diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_mdio.c b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_mdio.c
new file mode 100644
index 000000000..e123505c7
--- /dev/null
+++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_mdio.c
@@ -0,0 +1,315 @@
+/*
+ *  Atheros AR71xx built-in ethernet mac driver
+ *
+ *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ *
+ *  Based on Atheros' AG7100 driver
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include "ag71xx.h"
+
+#define AG71XX_MDIO_RETRY	1000
+#define AG71XX_MDIO_DELAY	5
+
+static inline void ag71xx_mdio_wr(struct ag71xx_mdio *am, unsigned reg,
+				  u32 value)
+{
+	void __iomem *r;
+
+	r = am->mdio_base + reg;
+	__raw_writel(value, r);
+
+	/* flush write */
+	(void) __raw_readl(r);
+}
+
+static inline u32 ag71xx_mdio_rr(struct ag71xx_mdio *am, unsigned reg)
+{
+	return __raw_readl(am->mdio_base + reg);
+}
+
+static void ag71xx_mdio_dump_regs(struct ag71xx_mdio *am)
+{
+	DBG("%s: mii_cfg=%08x, mii_cmd=%08x, mii_addr=%08x\n",
+		am->mii_bus->name,
+		ag71xx_mdio_rr(am, AG71XX_REG_MII_CFG),
+		ag71xx_mdio_rr(am, AG71XX_REG_MII_CMD),
+		ag71xx_mdio_rr(am, AG71XX_REG_MII_ADDR));
+	DBG("%s: mii_ctrl=%08x, mii_status=%08x, mii_ind=%08x\n",
+		am->mii_bus->name,
+		ag71xx_mdio_rr(am, AG71XX_REG_MII_CTRL),
+		ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS),
+		ag71xx_mdio_rr(am, AG71XX_REG_MII_IND));
+}
+
+static int ag71xx_mdio_wait_busy(struct ag71xx_mdio *am)
+{
+	int i;
+
+	for (i = 0; i < AG71XX_MDIO_RETRY; i++) {
+		u32 busy;
+
+		udelay(AG71XX_MDIO_DELAY);
+
+		busy = ag71xx_mdio_rr(am, AG71XX_REG_MII_IND);
+		if (!busy)
+			return 0;
+
+		udelay(AG71XX_MDIO_DELAY);
+	}
+
+	pr_err("%s: MDIO operation timed out\n", am->mii_bus->name);
+
+	return -ETIMEDOUT;
+}
+
+int ag71xx_mdio_mii_read(struct ag71xx_mdio *am, int addr, int reg)
+{
+	int err;
+	int ret;
+
+	err = ag71xx_mdio_wait_busy(am);
+	if (err)
+		return 0xffff;
+
+	ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
+	ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
+			((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
+	ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_READ);
+
+	err = ag71xx_mdio_wait_busy(am);
+	if (err)
+		return 0xffff;
+
+	ret = ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS) & 0xffff;
+	ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
+
+	DBG("mii_read: addr=%04x, reg=%04x, value=%04x\n", addr, reg, ret);
+
+	return ret;
+}
+
+void ag71xx_mdio_mii_write(struct ag71xx_mdio *am, int addr, int reg, u16 val)
+{
+	DBG("mii_write: addr=%04x, reg=%04x, value=%04x\n", addr, reg, val);
+
+	ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
+			((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
+	ag71xx_mdio_wr(am, AG71XX_REG_MII_CTRL, val);
+
+	ag71xx_mdio_wait_busy(am);
+}
+
+static const u32 ar71xx_mdio_div_table[] = {
+	4, 4, 6, 8, 10, 14, 20, 28,
+};
+
+static const u32 ar7240_mdio_div_table[] = {
+	2, 2, 4, 6, 8, 12, 18, 26, 32, 40, 48, 56, 62, 70, 78, 96,
+};
+
+static const u32 ar933x_mdio_div_table[] = {
+	4, 4, 6, 8, 10, 14, 20, 28, 34, 42, 50, 58, 66, 74, 82, 98,
+};
+
+static int ag71xx_mdio_get_divider(struct ag71xx_mdio *am, u32 *div)
+{
+	unsigned long ref_clock, mdio_clock;
+	const u32 *table;
+	int ndivs;
+	int i;
+
+	ref_clock = am->pdata->ref_clock;
+	mdio_clock = am->pdata->mdio_clock;
+
+	if (!ref_clock || !mdio_clock)
+		return -EINVAL;
+
+	if (am->pdata->is_ar9330 || am->pdata->is_ar934x) {
+		table = ar933x_mdio_div_table;
+		ndivs = ARRAY_SIZE(ar933x_mdio_div_table);
+	} else if (am->pdata->is_ar7240) {
+		table = ar7240_mdio_div_table;
+		ndivs = ARRAY_SIZE(ar7240_mdio_div_table);
+	} else {
+		table = ar71xx_mdio_div_table;
+		ndivs = ARRAY_SIZE(ar71xx_mdio_div_table);
+	}
+
+	for (i = 0; i < ndivs; i++) {
+		unsigned long t;
+
+		t = ref_clock / table[i];
+		if (t <= mdio_clock) {
+			*div = i;
+			return 0;
+		}
+	}
+
+	dev_err(&am->mii_bus->dev, "no divider found for %lu/%lu\n",
+		ref_clock, mdio_clock);
+	return -ENOENT;
+}
+
+static int ag71xx_mdio_reset(struct mii_bus *bus)
+{
+	struct ag71xx_mdio *am = bus->priv;
+	u32 t;
+	int err;
+
+	err = ag71xx_mdio_get_divider(am, &t);
+	if (err) {
+		/* fallback */
+		if (am->pdata->is_ar7240)
+			t = MII_CFG_CLK_DIV_6;
+		else if (am->pdata->builtin_switch && !am->pdata->is_ar934x)
+			t = MII_CFG_CLK_DIV_10;
+		else if (!am->pdata->builtin_switch && am->pdata->is_ar934x)
+			t = MII_CFG_CLK_DIV_58;
+		else
+			t = MII_CFG_CLK_DIV_28;
+	}
+
+	ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t | MII_CFG_RESET);
+	udelay(100);
+
+	ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t);
+	udelay(100);
+
+	return 0;
+}
+
+static int ag71xx_mdio_read(struct mii_bus *bus, int addr, int reg)
+{
+	struct ag71xx_mdio *am = bus->priv;
+
+	if (am->pdata->builtin_switch)
+		return ar7240sw_phy_read(bus, addr, reg);
+	else
+		return ag71xx_mdio_mii_read(am, addr, reg);
+}
+
+static int ag71xx_mdio_write(struct mii_bus *bus, int addr, int reg, u16 val)
+{
+	struct ag71xx_mdio *am = bus->priv;
+
+	if (am->pdata->builtin_switch)
+		ar7240sw_phy_write(bus, addr, reg, val);
+	else
+		ag71xx_mdio_mii_write(am, addr, reg, val);
+	return 0;
+}
+
+static int __devinit ag71xx_mdio_probe(struct platform_device *pdev)
+{
+	struct ag71xx_mdio_platform_data *pdata;
+	struct ag71xx_mdio *am;
+	struct resource *res;
+	int i;
+	int err;
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "no platform data specified\n");
+		return -EINVAL;
+	}
+
+	am = kzalloc(sizeof(*am), GFP_KERNEL);
+	if (!am) {
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	am->pdata = pdata;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "no iomem resource found\n");
+		err = -ENXIO;
+		goto err_out;
+	}
+
+	am->mdio_base = ioremap_nocache(res->start, res->end - res->start + 1);
+	if (!am->mdio_base) {
+		dev_err(&pdev->dev, "unable to ioremap registers\n");
+		err = -ENOMEM;
+		goto err_free_mdio;
+	}
+
+	am->mii_bus = mdiobus_alloc();
+	if (am->mii_bus == NULL) {
+		err = -ENOMEM;
+		goto err_iounmap;
+	}
+
+	am->mii_bus->name = "ag71xx_mdio";
+	am->mii_bus->read = ag71xx_mdio_read;
+	am->mii_bus->write = ag71xx_mdio_write;
+	am->mii_bus->reset = ag71xx_mdio_reset;
+	am->mii_bus->irq = am->mii_irq;
+	am->mii_bus->priv = am;
+	am->mii_bus->parent = &pdev->dev;
+	snprintf(am->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(&pdev->dev));
+	am->mii_bus->phy_mask = pdata->phy_mask;
+
+	for (i = 0; i < PHY_MAX_ADDR; i++)
+		am->mii_irq[i] = PHY_POLL;
+
+	ag71xx_mdio_wr(am, AG71XX_REG_MAC_CFG1, 0);
+
+	err = mdiobus_register(am->mii_bus);
+	if (err)
+		goto err_free_bus;
+
+	ag71xx_mdio_dump_regs(am);
+
+	platform_set_drvdata(pdev, am);
+	return 0;
+
+err_free_bus:
+	mdiobus_free(am->mii_bus);
+err_iounmap:
+	iounmap(am->mdio_base);
+err_free_mdio:
+	kfree(am);
+err_out:
+	return err;
+}
+
+static int __devexit ag71xx_mdio_remove(struct platform_device *pdev)
+{
+	struct ag71xx_mdio *am = platform_get_drvdata(pdev);
+
+	if (am) {
+		mdiobus_unregister(am->mii_bus);
+		mdiobus_free(am->mii_bus);
+		iounmap(am->mdio_base);
+		kfree(am);
+		platform_set_drvdata(pdev, NULL);
+	}
+
+	return 0;
+}
+
+static struct platform_driver ag71xx_mdio_driver = {
+	.probe		= ag71xx_mdio_probe,
+	.remove		= __exit_p(ag71xx_mdio_remove),
+	.driver = {
+		.name	= "ag71xx-mdio",
+	}
+};
+
+int __init ag71xx_mdio_driver_init(void)
+{
+	return platform_driver_register(&ag71xx_mdio_driver);
+}
+
+void ag71xx_mdio_driver_exit(void)
+{
+	platform_driver_unregister(&ag71xx_mdio_driver);
+}