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152 lines
3.4 KiB
152 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Hisilicon Fast Ethernet MDIO Bus Driver |
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* |
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* Copyright (c) 2016 HiSilicon Technologies Co., Ltd. |
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*/ |
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#include <linux/clk.h> |
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#include <linux/iopoll.h> |
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#include <linux/kernel.h> |
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#include <linux/module.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/platform_device.h> |
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#define MDIO_RWCTRL 0x00 |
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#define MDIO_RO_DATA 0x04 |
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#define MDIO_WRITE BIT(13) |
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#define MDIO_RW_FINISH BIT(15) |
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#define BIT_PHY_ADDR_OFFSET 8 |
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#define BIT_WR_DATA_OFFSET 16 |
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struct hisi_femac_mdio_data { |
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struct clk *clk; |
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void __iomem *membase; |
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}; |
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static int hisi_femac_mdio_wait_ready(struct hisi_femac_mdio_data *data) |
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{ |
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u32 val; |
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return readl_poll_timeout(data->membase + MDIO_RWCTRL, |
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val, val & MDIO_RW_FINISH, 20, 10000); |
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} |
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static int hisi_femac_mdio_read(struct mii_bus *bus, int mii_id, int regnum) |
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{ |
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struct hisi_femac_mdio_data *data = bus->priv; |
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int ret; |
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ret = hisi_femac_mdio_wait_ready(data); |
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if (ret) |
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return ret; |
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writel((mii_id << BIT_PHY_ADDR_OFFSET) | regnum, |
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data->membase + MDIO_RWCTRL); |
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ret = hisi_femac_mdio_wait_ready(data); |
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if (ret) |
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return ret; |
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return readl(data->membase + MDIO_RO_DATA) & 0xFFFF; |
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} |
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static int hisi_femac_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 hisi_femac_mdio_data *data = bus->priv; |
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int ret; |
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ret = hisi_femac_mdio_wait_ready(data); |
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if (ret) |
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return ret; |
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writel(MDIO_WRITE | (value << BIT_WR_DATA_OFFSET) | |
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(mii_id << BIT_PHY_ADDR_OFFSET) | regnum, |
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data->membase + MDIO_RWCTRL); |
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return hisi_femac_mdio_wait_ready(data); |
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} |
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static int hisi_femac_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 hisi_femac_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 = "hisi_femac_mii_bus"; |
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bus->read = &hisi_femac_mdio_read; |
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bus->write = &hisi_femac_mdio_write; |
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snprintf(bus->id, MII_BUS_ID_SIZE, "%s", pdev->name); |
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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->clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(data->clk)) { |
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ret = PTR_ERR(data->clk); |
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goto err_out_free_mdiobus; |
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} |
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ret = clk_prepare_enable(data->clk); |
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if (ret) |
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goto err_out_free_mdiobus; |
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ret = of_mdiobus_register(bus, np); |
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if (ret) |
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goto err_out_disable_clk; |
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platform_set_drvdata(pdev, bus); |
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return 0; |
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err_out_disable_clk: |
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clk_disable_unprepare(data->clk); |
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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 hisi_femac_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 hisi_femac_mdio_data *data = bus->priv; |
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mdiobus_unregister(bus); |
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clk_disable_unprepare(data->clk); |
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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 hisi_femac_mdio_dt_ids[] = { |
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{ .compatible = "hisilicon,hisi-femac-mdio" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, hisi_femac_mdio_dt_ids); |
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static struct platform_driver hisi_femac_mdio_driver = { |
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.probe = hisi_femac_mdio_probe, |
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.remove = hisi_femac_mdio_remove, |
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.driver = { |
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.name = "hisi-femac-mdio", |
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.of_match_table = hisi_femac_mdio_dt_ids, |
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}, |
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}; |
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module_platform_driver(hisi_femac_mdio_driver); |
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MODULE_DESCRIPTION("Hisilicon Fast Ethernet MAC MDIO interface driver"); |
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MODULE_AUTHOR("Dongpo Li <[email protected]>"); |
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MODULE_LICENSE("GPL");
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