summaryrefslogtreecommitdiff
path: root/drivers/net/phy/mdio-bcm-unimac.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/phy/mdio-bcm-unimac.c')
-rw-r--r--drivers/net/phy/mdio-bcm-unimac.c254
1 files changed, 0 insertions, 254 deletions
diff --git a/drivers/net/phy/mdio-bcm-unimac.c b/drivers/net/phy/mdio-bcm-unimac.c
deleted file mode 100644
index 34395230ce70..000000000000
--- a/drivers/net/phy/mdio-bcm-unimac.c
+++ /dev/null
@@ -1,254 +0,0 @@
-/*
- * Broadcom UniMAC MDIO bus controller driver
- *
- * Copyright (C) 2014-2017 Broadcom
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#include <linux/kernel.h>
-#include <linux/phy.h>
-#include <linux/platform_device.h>
-#include <linux/sched.h>
-#include <linux/module.h>
-#include <linux/io.h>
-#include <linux/delay.h>
-
-#include <linux/of.h>
-#include <linux/of_platform.h>
-#include <linux/of_mdio.h>
-
-#define MDIO_CMD 0x00
-#define MDIO_START_BUSY (1 << 29)
-#define MDIO_READ_FAIL (1 << 28)
-#define MDIO_RD (2 << 26)
-#define MDIO_WR (1 << 26)
-#define MDIO_PMD_SHIFT 21
-#define MDIO_PMD_MASK 0x1F
-#define MDIO_REG_SHIFT 16
-#define MDIO_REG_MASK 0x1F
-
-#define MDIO_CFG 0x04
-#define MDIO_C22 (1 << 0)
-#define MDIO_C45 0
-#define MDIO_CLK_DIV_SHIFT 4
-#define MDIO_CLK_DIV_MASK 0x3F
-#define MDIO_SUPP_PREAMBLE (1 << 12)
-
-struct unimac_mdio_priv {
- struct mii_bus *mii_bus;
- void __iomem *base;
-};
-
-static inline void unimac_mdio_start(struct unimac_mdio_priv *priv)
-{
- u32 reg;
-
- reg = __raw_readl(priv->base + MDIO_CMD);
- reg |= MDIO_START_BUSY;
- __raw_writel(reg, priv->base + MDIO_CMD);
-}
-
-static inline unsigned int unimac_mdio_busy(struct unimac_mdio_priv *priv)
-{
- return __raw_readl(priv->base + MDIO_CMD) & MDIO_START_BUSY;
-}
-
-static int unimac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
-{
- struct unimac_mdio_priv *priv = bus->priv;
- unsigned int timeout = 1000;
- u32 cmd;
-
- /* Prepare the read operation */
- cmd = MDIO_RD | (phy_id << MDIO_PMD_SHIFT) | (reg << MDIO_REG_SHIFT);
- __raw_writel(cmd, priv->base + MDIO_CMD);
-
- /* Start MDIO transaction */
- unimac_mdio_start(priv);
-
- do {
- if (!unimac_mdio_busy(priv))
- break;
-
- usleep_range(1000, 2000);
- } while (timeout--);
-
- if (!timeout)
- return -ETIMEDOUT;
-
- cmd = __raw_readl(priv->base + MDIO_CMD);
-
- /* Some broken devices are known not to release the line during
- * turn-around, e.g: Broadcom BCM53125 external switches, so check for
- * that condition here and ignore the MDIO controller read failure
- * indication.
- */
- if (!(bus->phy_ignore_ta_mask & 1 << phy_id) && (cmd & MDIO_READ_FAIL))
- return -EIO;
-
- return cmd & 0xffff;
-}
-
-static int unimac_mdio_write(struct mii_bus *bus, int phy_id,
- int reg, u16 val)
-{
- struct unimac_mdio_priv *priv = bus->priv;
- unsigned int timeout = 1000;
- u32 cmd;
-
- /* Prepare the write operation */
- cmd = MDIO_WR | (phy_id << MDIO_PMD_SHIFT) |
- (reg << MDIO_REG_SHIFT) | (0xffff & val);
- __raw_writel(cmd, priv->base + MDIO_CMD);
-
- unimac_mdio_start(priv);
-
- do {
- if (!unimac_mdio_busy(priv))
- break;
-
- usleep_range(1000, 2000);
- } while (timeout--);
-
- if (!timeout)
- return -ETIMEDOUT;
-
- return 0;
-}
-
-/* Workaround for integrated BCM7xxx Gigabit PHYs which have a problem with
- * their internal MDIO management controller making them fail to successfully
- * be read from or written to for the first transaction. We insert a dummy
- * BMSR read here to make sure that phy_get_device() and get_phy_id() can
- * correctly read the PHY MII_PHYSID1/2 registers and successfully register a
- * PHY device for this peripheral.
- *
- * Once the PHY driver is registered, we can workaround subsequent reads from
- * there (e.g: during system-wide power management).
- *
- * bus->reset is invoked before mdiobus_scan during mdiobus_register and is
- * therefore the right location to stick that workaround. Since we do not want
- * to read from non-existing PHYs, we either use bus->phy_mask or do a manual
- * Device Tree scan to limit the search area.
- */
-static int unimac_mdio_reset(struct mii_bus *bus)
-{
- struct device_node *np = bus->dev.of_node;
- struct device_node *child;
- u32 read_mask = 0;
- int addr;
-
- if (!np) {
- read_mask = ~bus->phy_mask;
- } else {
- for_each_available_child_of_node(np, child) {
- addr = of_mdio_parse_addr(&bus->dev, child);
- if (addr < 0)
- continue;
-
- read_mask |= 1 << addr;
- }
- }
-
- for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
- if (read_mask & 1 << addr)
- mdiobus_read(bus, addr, MII_BMSR);
- }
-
- return 0;
-}
-
-static int unimac_mdio_probe(struct platform_device *pdev)
-{
- struct unimac_mdio_priv *priv;
- struct device_node *np;
- struct mii_bus *bus;
- struct resource *r;
- int ret;
-
- np = pdev->dev.of_node;
-
- priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
-
- r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
- /* Just ioremap, as this MDIO block is usually integrated into an
- * Ethernet MAC controller register range
- */
- priv->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
- if (!priv->base) {
- dev_err(&pdev->dev, "failed to remap register\n");
- return -ENOMEM;
- }
-
- priv->mii_bus = mdiobus_alloc();
- if (!priv->mii_bus)
- return -ENOMEM;
-
- bus = priv->mii_bus;
- bus->priv = priv;
- bus->name = "unimac MII bus";
- bus->parent = &pdev->dev;
- bus->read = unimac_mdio_read;
- bus->write = unimac_mdio_write;
- bus->reset = unimac_mdio_reset;
- snprintf(bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
-
- ret = of_mdiobus_register(bus, np);
- if (ret) {
- dev_err(&pdev->dev, "MDIO bus registration failed\n");
- goto out_mdio_free;
- }
-
- platform_set_drvdata(pdev, priv);
-
- dev_info(&pdev->dev, "Broadcom UniMAC MDIO bus at 0x%p\n", priv->base);
-
- return 0;
-
-out_mdio_free:
- mdiobus_free(bus);
- return ret;
-}
-
-static int unimac_mdio_remove(struct platform_device *pdev)
-{
- struct unimac_mdio_priv *priv = platform_get_drvdata(pdev);
-
- mdiobus_unregister(priv->mii_bus);
- mdiobus_free(priv->mii_bus);
-
- return 0;
-}
-
-static const struct of_device_id unimac_mdio_ids[] = {
- { .compatible = "brcm,genet-mdio-v5", },
- { .compatible = "brcm,genet-mdio-v4", },
- { .compatible = "brcm,genet-mdio-v3", },
- { .compatible = "brcm,genet-mdio-v2", },
- { .compatible = "brcm,genet-mdio-v1", },
- { .compatible = "brcm,unimac-mdio", },
- { /* sentinel */ },
-};
-MODULE_DEVICE_TABLE(of, unimac_mdio_ids);
-
-static struct platform_driver unimac_mdio_driver = {
- .driver = {
- .name = "unimac-mdio",
- .of_match_table = unimac_mdio_ids,
- },
- .probe = unimac_mdio_probe,
- .remove = unimac_mdio_remove,
-};
-module_platform_driver(unimac_mdio_driver);
-
-MODULE_AUTHOR("Broadcom Corporation");
-MODULE_DESCRIPTION("Broadcom UniMAC MDIO bus controller");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:unimac-mdio");
generated by cgit (git 2.34.1) at 2025-12-26 13:05:23 +0000