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187 lines
4.2 KiB
187 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* MOXA ART Ethernet (RTL8201CP) MDIO interface driver |
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* |
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* Copyright (C) 2013 Jonas Jensen <[email protected]> |
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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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#define REG_PHY_CTRL 0 |
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#define REG_PHY_WRITE_DATA 4 |
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/* REG_PHY_CTRL */ |
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#define MIIWR BIT(27) /* init write sequence (auto cleared)*/ |
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#define MIIRD BIT(26) |
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#define REGAD_MASK 0x3e00000 |
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#define PHYAD_MASK 0x1f0000 |
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#define MIIRDATA_MASK 0xffff |
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/* REG_PHY_WRITE_DATA */ |
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#define MIIWDATA_MASK 0xffff |
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struct moxart_mdio_data { |
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void __iomem *base; |
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}; |
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static int moxart_mdio_read(struct mii_bus *bus, int mii_id, int regnum) |
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{ |
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struct moxart_mdio_data *data = bus->priv; |
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u32 ctrl = 0; |
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unsigned int count = 5; |
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dev_dbg(&bus->dev, "%s\n", __func__); |
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ctrl |= MIIRD | ((mii_id << 16) & PHYAD_MASK) | |
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((regnum << 21) & REGAD_MASK); |
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writel(ctrl, data->base + REG_PHY_CTRL); |
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do { |
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ctrl = readl(data->base + REG_PHY_CTRL); |
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if (!(ctrl & MIIRD)) |
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return ctrl & MIIRDATA_MASK; |
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mdelay(10); |
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count--; |
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} while (count > 0); |
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dev_dbg(&bus->dev, "%s timed out\n", __func__); |
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return -ETIMEDOUT; |
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} |
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static int moxart_mdio_write(struct mii_bus *bus, int mii_id, |
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int regnum, u16 value) |
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{ |
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struct moxart_mdio_data *data = bus->priv; |
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u32 ctrl = 0; |
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unsigned int count = 5; |
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dev_dbg(&bus->dev, "%s\n", __func__); |
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ctrl |= MIIWR | ((mii_id << 16) & PHYAD_MASK) | |
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((regnum << 21) & REGAD_MASK); |
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value &= MIIWDATA_MASK; |
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writel(value, data->base + REG_PHY_WRITE_DATA); |
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writel(ctrl, data->base + REG_PHY_CTRL); |
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do { |
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ctrl = readl(data->base + REG_PHY_CTRL); |
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if (!(ctrl & MIIWR)) |
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return 0; |
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mdelay(10); |
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count--; |
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} while (count > 0); |
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dev_dbg(&bus->dev, "%s timed out\n", __func__); |
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return -ETIMEDOUT; |
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} |
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static int moxart_mdio_reset(struct mii_bus *bus) |
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{ |
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int data, i; |
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for (i = 0; i < PHY_MAX_ADDR; i++) { |
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data = moxart_mdio_read(bus, i, MII_BMCR); |
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if (data < 0) |
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continue; |
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data |= BMCR_RESET; |
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if (moxart_mdio_write(bus, i, MII_BMCR, data) < 0) |
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continue; |
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} |
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return 0; |
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} |
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static int moxart_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 moxart_mdio_data *data; |
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int ret, i; |
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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 = "MOXA ART Ethernet MII"; |
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bus->read = &moxart_mdio_read; |
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bus->write = &moxart_mdio_write; |
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bus->reset = &moxart_mdio_reset; |
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snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d-mii", pdev->name, pdev->id); |
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bus->parent = &pdev->dev; |
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/* Setting PHY_MAC_INTERRUPT here even if it has no effect, |
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* of_mdiobus_register() sets these PHY_POLL. |
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* Ideally, the interrupt from MAC controller could be used to |
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* detect link state changes, not polling, i.e. if there was |
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* a way phy_driver could set PHY_HAS_INTERRUPT but have that |
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* interrupt handled in ethernet drivercode. |
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*/ |
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for (i = 0; i < PHY_MAX_ADDR; i++) |
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bus->irq[i] = PHY_MAC_INTERRUPT; |
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data = bus->priv; |
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data->base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(data->base)) { |
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ret = PTR_ERR(data->base); |
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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_free_mdiobus; |
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platform_set_drvdata(pdev, bus); |
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return 0; |
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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 moxart_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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mdiobus_unregister(bus); |
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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 moxart_mdio_dt_ids[] = { |
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{ .compatible = "moxa,moxart-mdio" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, moxart_mdio_dt_ids); |
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static struct platform_driver moxart_mdio_driver = { |
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.probe = moxart_mdio_probe, |
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.remove = moxart_mdio_remove, |
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.driver = { |
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.name = "moxart-mdio", |
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.of_match_table = moxart_mdio_dt_ids, |
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}, |
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}; |
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module_platform_driver(moxart_mdio_driver); |
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MODULE_DESCRIPTION("MOXA ART MDIO interface driver"); |
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MODULE_AUTHOR("Jonas Jensen <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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