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221 lines
4.8 KiB
221 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2015 Broadcom Corporation |
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*/ |
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#include <linux/delay.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.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/sched.h> |
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#define IPROC_GPHY_MDCDIV 0x1a |
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#define MII_CTRL_OFFSET 0x000 |
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#define MII_CTRL_DIV_SHIFT 0 |
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#define MII_CTRL_PRE_SHIFT 7 |
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#define MII_CTRL_BUSY_SHIFT 8 |
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#define MII_DATA_OFFSET 0x004 |
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#define MII_DATA_MASK 0xffff |
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#define MII_DATA_TA_SHIFT 16 |
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#define MII_DATA_TA_VAL 2 |
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#define MII_DATA_RA_SHIFT 18 |
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#define MII_DATA_PA_SHIFT 23 |
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#define MII_DATA_OP_SHIFT 28 |
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#define MII_DATA_OP_WRITE 1 |
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#define MII_DATA_OP_READ 2 |
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#define MII_DATA_SB_SHIFT 30 |
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struct iproc_mdio_priv { |
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struct mii_bus *mii_bus; |
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void __iomem *base; |
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}; |
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static inline int iproc_mdio_wait_for_idle(void __iomem *base) |
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{ |
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u32 val; |
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unsigned int timeout = 1000; /* loop for 1s */ |
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do { |
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val = readl(base + MII_CTRL_OFFSET); |
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if ((val & BIT(MII_CTRL_BUSY_SHIFT)) == 0) |
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return 0; |
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usleep_range(1000, 2000); |
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} while (timeout--); |
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return -ETIMEDOUT; |
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} |
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static inline void iproc_mdio_config_clk(void __iomem *base) |
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{ |
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u32 val; |
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val = (IPROC_GPHY_MDCDIV << MII_CTRL_DIV_SHIFT) | |
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BIT(MII_CTRL_PRE_SHIFT); |
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writel(val, base + MII_CTRL_OFFSET); |
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} |
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static int iproc_mdio_read(struct mii_bus *bus, int phy_id, int reg) |
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{ |
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struct iproc_mdio_priv *priv = bus->priv; |
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u32 cmd; |
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int rc; |
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rc = iproc_mdio_wait_for_idle(priv->base); |
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if (rc) |
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return rc; |
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/* Prepare the read operation */ |
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cmd = (MII_DATA_TA_VAL << MII_DATA_TA_SHIFT) | |
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(reg << MII_DATA_RA_SHIFT) | |
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(phy_id << MII_DATA_PA_SHIFT) | |
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BIT(MII_DATA_SB_SHIFT) | |
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(MII_DATA_OP_READ << MII_DATA_OP_SHIFT); |
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writel(cmd, priv->base + MII_DATA_OFFSET); |
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rc = iproc_mdio_wait_for_idle(priv->base); |
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if (rc) |
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return rc; |
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cmd = readl(priv->base + MII_DATA_OFFSET) & MII_DATA_MASK; |
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return cmd; |
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} |
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static int iproc_mdio_write(struct mii_bus *bus, int phy_id, |
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int reg, u16 val) |
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{ |
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struct iproc_mdio_priv *priv = bus->priv; |
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u32 cmd; |
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int rc; |
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rc = iproc_mdio_wait_for_idle(priv->base); |
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if (rc) |
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return rc; |
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/* Prepare the write operation */ |
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cmd = (MII_DATA_TA_VAL << MII_DATA_TA_SHIFT) | |
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(reg << MII_DATA_RA_SHIFT) | |
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(phy_id << MII_DATA_PA_SHIFT) | |
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BIT(MII_DATA_SB_SHIFT) | |
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(MII_DATA_OP_WRITE << MII_DATA_OP_SHIFT) | |
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((u32)(val) & MII_DATA_MASK); |
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writel(cmd, priv->base + MII_DATA_OFFSET); |
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rc = iproc_mdio_wait_for_idle(priv->base); |
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if (rc) |
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return rc; |
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return 0; |
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} |
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static int iproc_mdio_probe(struct platform_device *pdev) |
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{ |
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struct iproc_mdio_priv *priv; |
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struct mii_bus *bus; |
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int rc; |
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(priv->base)) { |
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dev_err(&pdev->dev, "failed to ioremap register\n"); |
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return PTR_ERR(priv->base); |
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} |
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priv->mii_bus = mdiobus_alloc(); |
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if (!priv->mii_bus) { |
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dev_err(&pdev->dev, "MDIO bus alloc failed\n"); |
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return -ENOMEM; |
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} |
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bus = priv->mii_bus; |
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bus->priv = priv; |
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bus->name = "iProc MDIO bus"; |
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snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d", pdev->name, pdev->id); |
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bus->parent = &pdev->dev; |
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bus->read = iproc_mdio_read; |
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bus->write = iproc_mdio_write; |
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iproc_mdio_config_clk(priv->base); |
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rc = of_mdiobus_register(bus, pdev->dev.of_node); |
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if (rc) { |
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dev_err(&pdev->dev, "MDIO bus registration failed\n"); |
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goto err_iproc_mdio; |
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} |
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platform_set_drvdata(pdev, priv); |
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dev_info(&pdev->dev, "Broadcom iProc MDIO bus registered\n"); |
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return 0; |
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err_iproc_mdio: |
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mdiobus_free(bus); |
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return rc; |
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} |
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static int iproc_mdio_remove(struct platform_device *pdev) |
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{ |
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struct iproc_mdio_priv *priv = platform_get_drvdata(pdev); |
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mdiobus_unregister(priv->mii_bus); |
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mdiobus_free(priv->mii_bus); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int iproc_mdio_resume(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct iproc_mdio_priv *priv = platform_get_drvdata(pdev); |
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/* restore the mii clock configuration */ |
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iproc_mdio_config_clk(priv->base); |
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return 0; |
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} |
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static const struct dev_pm_ops iproc_mdio_pm_ops = { |
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.resume = iproc_mdio_resume |
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}; |
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#endif /* CONFIG_PM_SLEEP */ |
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static const struct of_device_id iproc_mdio_of_match[] = { |
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{ .compatible = "brcm,iproc-mdio", }, |
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{ /* sentinel */ }, |
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}; |
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MODULE_DEVICE_TABLE(of, iproc_mdio_of_match); |
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static struct platform_driver iproc_mdio_driver = { |
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.driver = { |
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.name = "iproc-mdio", |
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.of_match_table = iproc_mdio_of_match, |
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#ifdef CONFIG_PM_SLEEP |
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.pm = &iproc_mdio_pm_ops, |
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#endif |
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}, |
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.probe = iproc_mdio_probe, |
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.remove = iproc_mdio_remove, |
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}; |
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module_platform_driver(iproc_mdio_driver); |
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MODULE_AUTHOR("Broadcom Corporation"); |
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MODULE_DESCRIPTION("Broadcom iProc MDIO bus controller"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:iproc-mdio");
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