185 строки
4.1 KiB
C
185 строки
4.1 KiB
C
// 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 <noltari@gmail.com>
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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 <noltari@gmail.com>");
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MODULE_DESCRIPTION("BCM6368 mdiomux bus controller driver");
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MODULE_LICENSE("GPL v2");
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