// SPDX-License-Identifier: GPL-2.0-or-later
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/* Copyright (C) 2019 IBM Corp. */
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#include <linux/bitfield.h>
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#include <linux/delay.h>
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#include <linux/iopoll.h>
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#include <linux/mdio.h>
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#include <linux/module.h>
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#include <linux/of.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 DRV_NAME "mdio-aspeed"
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#define ASPEED_MDIO_CTRL 0x0
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#define ASPEED_MDIO_CTRL_FIRE BIT(31)
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#define ASPEED_MDIO_CTRL_ST BIT(28)
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#define ASPEED_MDIO_CTRL_ST_C45 0
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#define ASPEED_MDIO_CTRL_ST_C22 1
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#define ASPEED_MDIO_CTRL_OP GENMASK(27, 26)
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#define MDIO_C22_OP_WRITE 0b01
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#define MDIO_C22_OP_READ 0b10
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#define ASPEED_MDIO_CTRL_PHYAD GENMASK(25, 21)
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#define ASPEED_MDIO_CTRL_REGAD GENMASK(20, 16)
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#define ASPEED_MDIO_CTRL_MIIWDATA GENMASK(15, 0)
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#define ASPEED_MDIO_DATA 0x4
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#define ASPEED_MDIO_DATA_MDC_THRES GENMASK(31, 24)
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#define ASPEED_MDIO_DATA_MDIO_EDGE BIT(23)
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#define ASPEED_MDIO_DATA_MDIO_LATCH GENMASK(22, 20)
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#define ASPEED_MDIO_DATA_IDLE BIT(16)
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#define ASPEED_MDIO_DATA_MIIRDATA GENMASK(15, 0)
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#define ASPEED_MDIO_INTERVAL_US 100
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#define ASPEED_MDIO_TIMEOUT_US (ASPEED_MDIO_INTERVAL_US * 10)
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struct aspeed_mdio {
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void __iomem *base;
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};
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static int aspeed_mdio_read(struct mii_bus *bus, int addr, int regnum)
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{
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struct aspeed_mdio *ctx = bus->priv;
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u32 ctrl;
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u32 data;
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int rc;
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dev_dbg(&bus->dev, "%s: addr: %d, regnum: %d\n", __func__, addr,
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regnum);
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/* Just clause 22 for the moment */
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if (regnum & MII_ADDR_C45)
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return -EOPNOTSUPP;
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ctrl = ASPEED_MDIO_CTRL_FIRE
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| FIELD_PREP(ASPEED_MDIO_CTRL_ST, ASPEED_MDIO_CTRL_ST_C22)
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| FIELD_PREP(ASPEED_MDIO_CTRL_OP, MDIO_C22_OP_READ)
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| FIELD_PREP(ASPEED_MDIO_CTRL_PHYAD, addr)
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| FIELD_PREP(ASPEED_MDIO_CTRL_REGAD, regnum);
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iowrite32(ctrl, ctx->base + ASPEED_MDIO_CTRL);
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rc = readl_poll_timeout(ctx->base + ASPEED_MDIO_CTRL, ctrl,
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!(ctrl & ASPEED_MDIO_CTRL_FIRE),
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ASPEED_MDIO_INTERVAL_US,
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ASPEED_MDIO_TIMEOUT_US);
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if (rc < 0)
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return rc;
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rc = readl_poll_timeout(ctx->base + ASPEED_MDIO_DATA, data,
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data & ASPEED_MDIO_DATA_IDLE,
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ASPEED_MDIO_INTERVAL_US,
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ASPEED_MDIO_TIMEOUT_US);
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if (rc < 0)
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return rc;
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return FIELD_GET(ASPEED_MDIO_DATA_MIIRDATA, data);
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}
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static int aspeed_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val)
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{
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struct aspeed_mdio *ctx = bus->priv;
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u32 ctrl;
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dev_dbg(&bus->dev, "%s: addr: %d, regnum: %d, val: 0x%x\n",
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__func__, addr, regnum, val);
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/* Just clause 22 for the moment */
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if (regnum & MII_ADDR_C45)
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return -EOPNOTSUPP;
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ctrl = ASPEED_MDIO_CTRL_FIRE
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| FIELD_PREP(ASPEED_MDIO_CTRL_ST, ASPEED_MDIO_CTRL_ST_C22)
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| FIELD_PREP(ASPEED_MDIO_CTRL_OP, MDIO_C22_OP_WRITE)
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| FIELD_PREP(ASPEED_MDIO_CTRL_PHYAD, addr)
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| FIELD_PREP(ASPEED_MDIO_CTRL_REGAD, regnum)
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| FIELD_PREP(ASPEED_MDIO_CTRL_MIIWDATA, val);
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iowrite32(ctrl, ctx->base + ASPEED_MDIO_CTRL);
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return readl_poll_timeout(ctx->base + ASPEED_MDIO_CTRL, ctrl,
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!(ctrl & ASPEED_MDIO_CTRL_FIRE),
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ASPEED_MDIO_INTERVAL_US,
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ASPEED_MDIO_TIMEOUT_US);
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}
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static int aspeed_mdio_probe(struct platform_device *pdev)
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{
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struct aspeed_mdio *ctx;
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struct mii_bus *bus;
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int rc;
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bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*ctx));
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if (!bus)
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return -ENOMEM;
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ctx = bus->priv;
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ctx->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(ctx->base))
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return PTR_ERR(ctx->base);
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bus->name = DRV_NAME;
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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 = aspeed_mdio_read;
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bus->write = aspeed_mdio_write;
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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, "Cannot register MDIO bus!\n");
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return rc;
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}
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platform_set_drvdata(pdev, bus);
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return 0;
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}
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static int aspeed_mdio_remove(struct platform_device *pdev)
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{
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mdiobus_unregister(platform_get_drvdata(pdev));
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return 0;
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}
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static const struct of_device_id aspeed_mdio_of_match[] = {
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{ .compatible = "aspeed,ast2600-mdio", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, aspeed_mdio_of_match);
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static struct platform_driver aspeed_mdio_driver = {
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.driver = {
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.name = DRV_NAME,
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.of_match_table = aspeed_mdio_of_match,
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},
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.probe = aspeed_mdio_probe,
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.remove = aspeed_mdio_remove,
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};
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module_platform_driver(aspeed_mdio_driver);
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MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
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MODULE_LICENSE("GPL");
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