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180 lines
4.4 KiB
180 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Allwinner EMAC MDIO interface driver |
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* |
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* Copyright 2012-2013 Stefan Roese <[email protected]> |
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* Copyright 2013 Maxime Ripard <[email protected]> |
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* |
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* Based on the Linux driver provided by Allwinner: |
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* Copyright (C) 1997 Sten Wang |
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*/ |
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#include <linux/delay.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/of_address.h> |
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#include <linux/of_mdio.h> |
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#include <linux/phy.h> |
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#include <linux/platform_device.h> |
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#include <linux/regulator/consumer.h> |
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#define EMAC_MAC_MCMD_REG (0x00) |
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#define EMAC_MAC_MADR_REG (0x04) |
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#define EMAC_MAC_MWTD_REG (0x08) |
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#define EMAC_MAC_MRDD_REG (0x0c) |
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#define EMAC_MAC_MIND_REG (0x10) |
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#define EMAC_MAC_SSRR_REG (0x14) |
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#define MDIO_TIMEOUT (msecs_to_jiffies(100)) |
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struct sun4i_mdio_data { |
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void __iomem *membase; |
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struct regulator *regulator; |
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}; |
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static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum) |
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{ |
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struct sun4i_mdio_data *data = bus->priv; |
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unsigned long timeout_jiffies; |
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int value; |
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/* issue the phy address and reg */ |
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writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG); |
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/* pull up the phy io line */ |
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writel(0x1, data->membase + EMAC_MAC_MCMD_REG); |
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/* Wait read complete */ |
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timeout_jiffies = jiffies + MDIO_TIMEOUT; |
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while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { |
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if (time_is_before_jiffies(timeout_jiffies)) |
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return -ETIMEDOUT; |
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msleep(1); |
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} |
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/* push down the phy io line */ |
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writel(0x0, data->membase + EMAC_MAC_MCMD_REG); |
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/* and read data */ |
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value = readl(data->membase + EMAC_MAC_MRDD_REG); |
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return value; |
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} |
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static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum, |
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u16 value) |
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{ |
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struct sun4i_mdio_data *data = bus->priv; |
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unsigned long timeout_jiffies; |
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/* issue the phy address and reg */ |
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writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG); |
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/* pull up the phy io line */ |
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writel(0x1, data->membase + EMAC_MAC_MCMD_REG); |
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/* Wait read complete */ |
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timeout_jiffies = jiffies + MDIO_TIMEOUT; |
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while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { |
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if (time_is_before_jiffies(timeout_jiffies)) |
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return -ETIMEDOUT; |
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msleep(1); |
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} |
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/* push down the phy io line */ |
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writel(0x0, data->membase + EMAC_MAC_MCMD_REG); |
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/* and write data */ |
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writel(value, data->membase + EMAC_MAC_MWTD_REG); |
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return 0; |
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} |
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static int sun4i_mdio_probe(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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struct mii_bus *bus; |
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struct sun4i_mdio_data *data; |
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int ret; |
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bus = mdiobus_alloc_size(sizeof(*data)); |
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if (!bus) |
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return -ENOMEM; |
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bus->name = "sun4i_mii_bus"; |
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bus->read = &sun4i_mdio_read; |
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bus->write = &sun4i_mdio_write; |
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snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev)); |
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bus->parent = &pdev->dev; |
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data = bus->priv; |
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data->membase = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(data->membase)) { |
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ret = PTR_ERR(data->membase); |
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goto err_out_free_mdiobus; |
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} |
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data->regulator = devm_regulator_get(&pdev->dev, "phy"); |
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if (IS_ERR(data->regulator)) { |
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if (PTR_ERR(data->regulator) == -EPROBE_DEFER) { |
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ret = -EPROBE_DEFER; |
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goto err_out_free_mdiobus; |
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} |
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dev_info(&pdev->dev, "no regulator found\n"); |
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data->regulator = NULL; |
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} else { |
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ret = regulator_enable(data->regulator); |
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if (ret) |
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goto err_out_free_mdiobus; |
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} |
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ret = of_mdiobus_register(bus, np); |
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if (ret < 0) |
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goto err_out_disable_regulator; |
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platform_set_drvdata(pdev, bus); |
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return 0; |
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err_out_disable_regulator: |
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if (data->regulator) |
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regulator_disable(data->regulator); |
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err_out_free_mdiobus: |
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mdiobus_free(bus); |
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return ret; |
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} |
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static int sun4i_mdio_remove(struct platform_device *pdev) |
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{ |
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struct mii_bus *bus = platform_get_drvdata(pdev); |
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struct sun4i_mdio_data *data = bus->priv; |
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mdiobus_unregister(bus); |
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if (data->regulator) |
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regulator_disable(data->regulator); |
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mdiobus_free(bus); |
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return 0; |
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} |
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static const struct of_device_id sun4i_mdio_dt_ids[] = { |
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{ .compatible = "allwinner,sun4i-a10-mdio" }, |
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/* Deprecated */ |
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{ .compatible = "allwinner,sun4i-mdio" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, sun4i_mdio_dt_ids); |
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static struct platform_driver sun4i_mdio_driver = { |
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.probe = sun4i_mdio_probe, |
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.remove = sun4i_mdio_remove, |
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.driver = { |
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.name = "sun4i-mdio", |
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.of_match_table = sun4i_mdio_dt_ids, |
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}, |
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}; |
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module_platform_driver(sun4i_mdio_driver); |
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MODULE_DESCRIPTION("Allwinner EMAC MDIO interface driver"); |
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MODULE_AUTHOR("Maxime Ripard <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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