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184 lines
4.1 KiB
184 lines
4.1 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Broadcom BCM6368 mdiomux bus controller driver |
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* |
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* Copyright (C) 2021 Álvaro Fernández Rojas <[email protected]> |
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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/mdio-mux.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 MDIOC_REG 0x0 |
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#define MDIOC_EXT_MASK BIT(16) |
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#define MDIOC_REG_SHIFT 20 |
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#define MDIOC_PHYID_SHIFT 25 |
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#define MDIOC_RD_MASK BIT(30) |
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#define MDIOC_WR_MASK BIT(31) |
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#define MDIOD_REG 0x4 |
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struct bcm6368_mdiomux_desc { |
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void *mux_handle; |
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void __iomem *base; |
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struct device *dev; |
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struct mii_bus *mii_bus; |
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int ext_phy; |
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}; |
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static int bcm6368_mdiomux_read(struct mii_bus *bus, int phy_id, int loc) |
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{ |
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struct bcm6368_mdiomux_desc *md = bus->priv; |
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uint32_t reg; |
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int ret; |
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__raw_writel(0, md->base + MDIOC_REG); |
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reg = MDIOC_RD_MASK | |
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(phy_id << MDIOC_PHYID_SHIFT) | |
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(loc << MDIOC_REG_SHIFT); |
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if (md->ext_phy) |
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reg |= MDIOC_EXT_MASK; |
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__raw_writel(reg, md->base + MDIOC_REG); |
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udelay(50); |
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ret = __raw_readw(md->base + MDIOD_REG); |
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return ret; |
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} |
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static int bcm6368_mdiomux_write(struct mii_bus *bus, int phy_id, int loc, |
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uint16_t val) |
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{ |
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struct bcm6368_mdiomux_desc *md = bus->priv; |
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uint32_t reg; |
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__raw_writel(0, md->base + MDIOC_REG); |
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reg = MDIOC_WR_MASK | |
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(phy_id << MDIOC_PHYID_SHIFT) | |
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(loc << MDIOC_REG_SHIFT); |
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if (md->ext_phy) |
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reg |= MDIOC_EXT_MASK; |
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reg |= val; |
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__raw_writel(reg, md->base + MDIOC_REG); |
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udelay(50); |
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return 0; |
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} |
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static int bcm6368_mdiomux_switch_fn(int current_child, int desired_child, |
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void *data) |
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{ |
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struct bcm6368_mdiomux_desc *md = data; |
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md->ext_phy = desired_child; |
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return 0; |
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} |
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static int bcm6368_mdiomux_probe(struct platform_device *pdev) |
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{ |
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struct bcm6368_mdiomux_desc *md; |
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struct mii_bus *bus; |
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struct resource *res; |
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int rc; |
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md = devm_kzalloc(&pdev->dev, sizeof(*md), GFP_KERNEL); |
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if (!md) |
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return -ENOMEM; |
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md->dev = &pdev->dev; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) |
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return -EINVAL; |
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/* |
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* Just ioremap, as this MDIO block is usually integrated into an |
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* Ethernet MAC controller register range |
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*/ |
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md->base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); |
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if (!md->base) { |
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dev_err(&pdev->dev, "failed to ioremap register\n"); |
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return -ENOMEM; |
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} |
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md->mii_bus = devm_mdiobus_alloc(&pdev->dev); |
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if (!md->mii_bus) { |
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dev_err(&pdev->dev, "mdiomux bus alloc failed\n"); |
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return ENOMEM; |
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} |
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bus = md->mii_bus; |
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bus->priv = md; |
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bus->name = "BCM6368 MDIO mux 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 = bcm6368_mdiomux_read; |
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bus->write = bcm6368_mdiomux_write; |
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bus->phy_mask = 0x3f; |
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bus->dev.of_node = pdev->dev.of_node; |
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rc = mdiobus_register(bus); |
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if (rc) { |
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dev_err(&pdev->dev, "mdiomux registration failed\n"); |
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return rc; |
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} |
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platform_set_drvdata(pdev, md); |
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rc = mdio_mux_init(md->dev, md->dev->of_node, |
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bcm6368_mdiomux_switch_fn, &md->mux_handle, md, |
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md->mii_bus); |
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if (rc) { |
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dev_info(md->dev, "mdiomux initialization failed\n"); |
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goto out_register; |
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} |
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dev_info(&pdev->dev, "Broadcom BCM6368 MDIO mux bus\n"); |
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return 0; |
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out_register: |
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mdiobus_unregister(bus); |
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return rc; |
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} |
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static int bcm6368_mdiomux_remove(struct platform_device *pdev) |
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{ |
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struct bcm6368_mdiomux_desc *md = platform_get_drvdata(pdev); |
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mdio_mux_uninit(md->mux_handle); |
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mdiobus_unregister(md->mii_bus); |
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return 0; |
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} |
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static const struct of_device_id bcm6368_mdiomux_ids[] = { |
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{ .compatible = "brcm,bcm6368-mdio-mux", }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, bcm6368_mdiomux_ids); |
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static struct platform_driver bcm6368_mdiomux_driver = { |
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.driver = { |
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.name = "bcm6368-mdio-mux", |
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.of_match_table = bcm6368_mdiomux_ids, |
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}, |
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.probe = bcm6368_mdiomux_probe, |
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.remove = bcm6368_mdiomux_remove, |
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}; |
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module_platform_driver(bcm6368_mdiomux_driver); |
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MODULE_AUTHOR("Álvaro Fernández Rojas <[email protected]>"); |
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MODULE_DESCRIPTION("BCM6368 mdiomux bus controller driver"); |
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MODULE_LICENSE("GPL v2");
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