+++ /dev/null
-/*
- * 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 <linux/clk.h>
-#include <linux/of_mdio.h>
-#include "ag71xx.h"
-
-#define AG71XX_MDIO_RETRY 1000
-#define AG71XX_MDIO_DELAY 5
-
-static int bus_count;
-
-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);
-
- regmap_read(am->mii_regmap, AG71XX_REG_MII_IND, &busy);
- if (!busy)
- return 0;
-
- udelay(AG71XX_MDIO_DELAY);
- }
-
- pr_err("%s: MDIO operation timed out\n", am->mii_bus->name);
-
- return -ETIMEDOUT;
-}
-
-static int ag71xx_mdio_mii_read(struct mii_bus *bus, int addr, int reg)
-{
- struct ag71xx_mdio *am = bus->priv;
- int err;
- int ret;
-
- err = ag71xx_mdio_wait_busy(am);
- if (err)
- return 0xffff;
-
- regmap_write(am->mii_regmap, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
- regmap_write(am->mii_regmap, AG71XX_REG_MII_ADDR,
- ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
- regmap_write(am->mii_regmap, AG71XX_REG_MII_CMD, MII_CMD_READ);
-
- err = ag71xx_mdio_wait_busy(am);
- if (err)
- return 0xffff;
-
- regmap_read(am->mii_regmap, AG71XX_REG_MII_STATUS, &ret);
- ret &= 0xffff;
- regmap_write(am->mii_regmap, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
-
- DBG("mii_read: addr=%04x, reg=%04x, value=%04x\n", addr, reg, ret);
-
- return ret;
-}
-
-static int ag71xx_mdio_mii_write(struct mii_bus *bus, int addr, int reg, u16 val)
-{
- struct ag71xx_mdio *am = bus->priv;
-
- DBG("mii_write: addr=%04x, reg=%04x, value=%04x\n", addr, reg, val);
-
- regmap_write(am->mii_regmap, AG71XX_REG_MII_ADDR,
- ((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
- regmap_write(am->mii_regmap, AG71XX_REG_MII_CTRL, val);
-
- ag71xx_mdio_wait_busy(am);
-
- return 0;
-}
-
-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 device_node *np, u32 *div)
-{
- struct clk *ref_clk = of_clk_get(np, 0);
- unsigned long ref_clock;
- u32 mdio_clock;
- const u32 *table;
- int ndivs, i;
-
- if (IS_ERR(ref_clk))
- return -EINVAL;
-
- ref_clock = clk_get_rate(ref_clk);
- clk_put(ref_clk);
-
- if(of_property_read_u32(np, "qca,mdio-max-frequency", &mdio_clock)) {
- if (of_property_read_bool(np, "builtin-switch"))
- mdio_clock = 5000000;
- else
- mdio_clock = 2000000;
- }
-
- if (of_device_is_compatible(np, "qca,ar9330-mdio") ||
- of_device_is_compatible(np, "qca,ar9340-mdio")) {
- table = ar933x_mdio_div_table;
- ndivs = ARRAY_SIZE(ar933x_mdio_div_table);
- } else if (of_device_is_compatible(np, "qca,ar7240-mdio")) {
- 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;
- }
- }
-
- return -ENOENT;
-}
-
-static int ag71xx_mdio_reset(struct mii_bus *bus)
-{
- struct device_node *np = bus->dev.of_node;
- struct ag71xx_mdio *am = bus->priv;
- bool builtin_switch;
- u32 t;
-
- builtin_switch = of_property_read_bool(np, "builtin-switch");
-
- if (ag71xx_mdio_get_divider(np, &t)) {
- if (of_device_is_compatible(np, "qca,ar9340-mdio"))
- t = MII_CFG_CLK_DIV_58;
- else if (builtin_switch)
- t = MII_CFG_CLK_DIV_10;
- else
- t = MII_CFG_CLK_DIV_28;
- }
-
- regmap_write(am->mii_regmap, AG71XX_REG_MII_CFG, t | MII_CFG_RESET);
- udelay(100);
-
- regmap_write(am->mii_regmap, AG71XX_REG_MII_CFG, t);
- udelay(100);
-
- return 0;
-}
-
-static int ag71xx_mdio_probe(struct platform_device *pdev)
-{
- struct device *amdev = &pdev->dev;
- struct device_node *np = pdev->dev.of_node;
- struct ag71xx_mdio *am;
- struct mii_bus *mii_bus;
- bool builtin_switch;
- int i, err;
-
- am = devm_kzalloc(amdev, sizeof(*am), GFP_KERNEL);
- if (!am)
- return -ENOMEM;
-
- am->mii_regmap = syscon_regmap_lookup_by_phandle(np, "regmap");
- if (IS_ERR(am->mii_regmap))
- return PTR_ERR(am->mii_regmap);
-
- mii_bus = devm_mdiobus_alloc(amdev);
- if (!mii_bus)
- return -ENOMEM;
-
- am->mdio_reset = devm_reset_control_get_exclusive(amdev, "mdio");
- builtin_switch = of_property_read_bool(np, "builtin-switch");
-
- mii_bus->name = "ag71xx_mdio";
- mii_bus->read = ag71xx_mdio_mii_read;
- mii_bus->write = ag71xx_mdio_mii_write;
- mii_bus->reset = ag71xx_mdio_reset;
- mii_bus->priv = am;
- mii_bus->parent = amdev;
- snprintf(mii_bus->id, MII_BUS_ID_SIZE, "%s.%d", np->name, bus_count++);
-
- if (!builtin_switch &&
- of_property_read_u32(np, "phy-mask", &mii_bus->phy_mask))
- mii_bus->phy_mask = 0;
-
- for (i = 0; i < PHY_MAX_ADDR; i++)
- mii_bus->irq[i] = PHY_POLL;
-
- if (!IS_ERR(am->mdio_reset)) {
- reset_control_assert(am->mdio_reset);
- msleep(100);
- reset_control_deassert(am->mdio_reset);
- msleep(200);
- }
-
- err = of_mdiobus_register(mii_bus, np);
- if (err)
- return err;
-
- am->mii_bus = mii_bus;
- platform_set_drvdata(pdev, am);
-
- return 0;
-}
-
-static int ag71xx_mdio_remove(struct platform_device *pdev)
-{
- struct ag71xx_mdio *am = platform_get_drvdata(pdev);
-
- mdiobus_unregister(am->mii_bus);
- return 0;
-}
-
-static const struct of_device_id ag71xx_mdio_match[] = {
- { .compatible = "qca,ar7240-mdio" },
- { .compatible = "qca,ar9330-mdio" },
- { .compatible = "qca,ar9340-mdio" },
- { .compatible = "qca,ath79-mdio" },
- {}
-};
-
-static struct platform_driver ag71xx_mdio_driver = {
- .probe = ag71xx_mdio_probe,
- .remove = ag71xx_mdio_remove,
- .driver = {
- .name = "ag71xx-mdio",
- .of_match_table = ag71xx_mdio_match,
- }
-};
-
-module_platform_driver(ag71xx_mdio_driver);
-MODULE_LICENSE("GPL");
projects / openwrt / staging / blogic.git / blobdiff