+++ /dev/null
-From e239756717b5c866958823a1609e2ccf268435be Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
-Date: Mon, 15 Mar 2021 16:45:28 +0100
-Subject: [PATCH 2/2] net: mdio: Add BCM6368 MDIO mux bus controller
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-This controller is present on BCM6318, BCM6328, BCM6362, BCM6368 and BCM63268
-SoCs.
-
-Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
-Signed-off-by: David S. Miller <davem@davemloft.net>
----
- drivers/net/mdio/Kconfig | 11 ++
- drivers/net/mdio/Makefile | 1 +
- drivers/net/mdio/mdio-mux-bcm6368.c | 184 ++++++++++++++++++++++++++++
- 3 files changed, 196 insertions(+)
- create mode 100644 drivers/net/mdio/mdio-mux-bcm6368.c
-
---- a/drivers/net/mdio/Kconfig
-+++ b/drivers/net/mdio/Kconfig
-@@ -200,6 +200,17 @@ config MDIO_BUS_MUX_MESON_G12A
- the amlogic g12a SoC. The multiplexers connects either the external
- or the internal MDIO bus to the parent bus.
-
-+config MDIO_BUS_MUX_BCM6368
-+ tristate "Broadcom BCM6368 MDIO bus multiplexers"
-+ depends on OF && OF_MDIO && (BMIPS_GENERIC || COMPILE_TEST)
-+ select MDIO_BUS_MUX
-+ default BMIPS_GENERIC
-+ help
-+ This module provides a driver for MDIO bus multiplexers found in
-+ BCM6368 based Broadcom SoCs. This multiplexer connects one of several
-+ child MDIO bus to a parent bus. Buses could be internal as well as
-+ external and selection logic lies inside the same multiplexer.
-+
- config MDIO_BUS_MUX_BCM_IPROC
- tristate "Broadcom iProc based MDIO bus multiplexers"
- depends on OF && OF_MDIO && (ARCH_BCM_IPROC || COMPILE_TEST)
---- a/drivers/net/mdio/Makefile
-+++ b/drivers/net/mdio/Makefile
-@@ -22,6 +22,7 @@ obj-$(CONFIG_MDIO_THUNDER) += mdio-thun
- obj-$(CONFIG_MDIO_XGENE) += mdio-xgene.o
-
- obj-$(CONFIG_MDIO_BUS_MUX) += mdio-mux.o
-+obj-$(CONFIG_MDIO_BUS_MUX_BCM6368) += mdio-mux-bcm6368.o
- obj-$(CONFIG_MDIO_BUS_MUX_BCM_IPROC) += mdio-mux-bcm-iproc.o
- obj-$(CONFIG_MDIO_BUS_MUX_GPIO) += mdio-mux-gpio.o
- obj-$(CONFIG_MDIO_BUS_MUX_MESON_G12A) += mdio-mux-meson-g12a.o
---- /dev/null
-+++ b/drivers/net/mdio/mdio-mux-bcm6368.c
-@@ -0,0 +1,184 @@
-+// SPDX-License-Identifier: GPL-2.0+
-+/*
-+ * Broadcom BCM6368 mdiomux bus controller driver
-+ *
-+ * Copyright (C) 2021 Álvaro Fernández Rojas <noltari@gmail.com>
-+ */
-+
-+#include <linux/delay.h>
-+#include <linux/io.h>
-+#include <linux/kernel.h>
-+#include <linux/mdio-mux.h>
-+#include <linux/module.h>
-+#include <linux/of.h>
-+#include <linux/of_platform.h>
-+#include <linux/of_mdio.h>
-+#include <linux/phy.h>
-+#include <linux/platform_device.h>
-+#include <linux/sched.h>
-+
-+#define MDIOC_REG 0x0
-+#define MDIOC_EXT_MASK BIT(16)
-+#define MDIOC_REG_SHIFT 20
-+#define MDIOC_PHYID_SHIFT 25
-+#define MDIOC_RD_MASK BIT(30)
-+#define MDIOC_WR_MASK BIT(31)
-+
-+#define MDIOD_REG 0x4
-+
-+struct bcm6368_mdiomux_desc {
-+ void *mux_handle;
-+ void __iomem *base;
-+ struct device *dev;
-+ struct mii_bus *mii_bus;
-+ int ext_phy;
-+};
-+
-+static int bcm6368_mdiomux_read(struct mii_bus *bus, int phy_id, int loc)
-+{
-+ struct bcm6368_mdiomux_desc *md = bus->priv;
-+ uint32_t reg;
-+ int ret;
-+
-+ __raw_writel(0, md->base + MDIOC_REG);
-+
-+ reg = MDIOC_RD_MASK |
-+ (phy_id << MDIOC_PHYID_SHIFT) |
-+ (loc << MDIOC_REG_SHIFT);
-+ if (md->ext_phy)
-+ reg |= MDIOC_EXT_MASK;
-+
-+ __raw_writel(reg, md->base + MDIOC_REG);
-+ udelay(50);
-+ ret = __raw_readw(md->base + MDIOD_REG);
-+
-+ return ret;
-+}
-+
-+static int bcm6368_mdiomux_write(struct mii_bus *bus, int phy_id, int loc,
-+ uint16_t val)
-+{
-+ struct bcm6368_mdiomux_desc *md = bus->priv;
-+ uint32_t reg;
-+
-+ __raw_writel(0, md->base + MDIOC_REG);
-+
-+ reg = MDIOC_WR_MASK |
-+ (phy_id << MDIOC_PHYID_SHIFT) |
-+ (loc << MDIOC_REG_SHIFT);
-+ if (md->ext_phy)
-+ reg |= MDIOC_EXT_MASK;
-+ reg |= val;
-+
-+ __raw_writel(reg, md->base + MDIOC_REG);
-+ udelay(50);
-+
-+ return 0;
-+}
-+
-+static int bcm6368_mdiomux_switch_fn(int current_child, int desired_child,
-+ void *data)
-+{
-+ struct bcm6368_mdiomux_desc *md = data;
-+
-+ md->ext_phy = desired_child;
-+
-+ return 0;
-+}
-+
-+static int bcm6368_mdiomux_probe(struct platform_device *pdev)
-+{
-+ struct bcm6368_mdiomux_desc *md;
-+ struct mii_bus *bus;
-+ struct resource *res;
-+ int rc;
-+
-+ md = devm_kzalloc(&pdev->dev, sizeof(*md), GFP_KERNEL);
-+ if (!md)
-+ return -ENOMEM;
-+ md->dev = &pdev->dev;
-+
-+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+ if (!res)
-+ return -EINVAL;
-+
-+ /*
-+ * Just ioremap, as this MDIO block is usually integrated into an
-+ * Ethernet MAC controller register range
-+ */
-+ md->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
-+ if (!md->base) {
-+ dev_err(&pdev->dev, "failed to ioremap register\n");
-+ return -ENOMEM;
-+ }
-+
-+ md->mii_bus = devm_mdiobus_alloc(&pdev->dev);
-+ if (!md->mii_bus) {
-+ dev_err(&pdev->dev, "mdiomux bus alloc failed\n");
-+ return ENOMEM;
-+ }
-+
-+ bus = md->mii_bus;
-+ bus->priv = md;
-+ bus->name = "BCM6368 MDIO mux bus";
-+ snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d", pdev->name, pdev->id);
-+ bus->parent = &pdev->dev;
-+ bus->read = bcm6368_mdiomux_read;
-+ bus->write = bcm6368_mdiomux_write;
-+ bus->phy_mask = 0x3f;
-+ bus->dev.of_node = pdev->dev.of_node;
-+
-+ rc = mdiobus_register(bus);
-+ if (rc) {
-+ dev_err(&pdev->dev, "mdiomux registration failed\n");
-+ return rc;
-+ }
-+
-+ platform_set_drvdata(pdev, md);
-+
-+ rc = mdio_mux_init(md->dev, md->dev->of_node,
-+ bcm6368_mdiomux_switch_fn, &md->mux_handle, md,
-+ md->mii_bus);
-+ if (rc) {
-+ dev_info(md->dev, "mdiomux initialization failed\n");
-+ goto out_register;
-+ }
-+
-+ dev_info(&pdev->dev, "Broadcom BCM6368 MDIO mux bus\n");
-+
-+ return 0;
-+
-+out_register:
-+ mdiobus_unregister(bus);
-+ return rc;
-+}
-+
-+static int bcm6368_mdiomux_remove(struct platform_device *pdev)
-+{
-+ struct bcm6368_mdiomux_desc *md = platform_get_drvdata(pdev);
-+
-+ mdio_mux_uninit(md->mux_handle);
-+ mdiobus_unregister(md->mii_bus);
-+
-+ return 0;
-+}
-+
-+static const struct of_device_id bcm6368_mdiomux_ids[] = {
-+ { .compatible = "brcm,bcm6368-mdio-mux", },
-+ { /* sentinel */ }
-+};
-+MODULE_DEVICE_TABLE(of, bcm6368_mdiomux_ids);
-+
-+static struct platform_driver bcm6368_mdiomux_driver = {
-+ .driver = {
-+ .name = "bcm6368-mdio-mux",
-+ .of_match_table = bcm6368_mdiomux_ids,
-+ },
-+ .probe = bcm6368_mdiomux_probe,
-+ .remove = bcm6368_mdiomux_remove,
-+};
-+module_platform_driver(bcm6368_mdiomux_driver);
-+
-+MODULE_AUTHOR("Álvaro Fernández Rojas <noltari@gmail.com>");
-+MODULE_DESCRIPTION("BCM6368 mdiomux bus controller driver");
-+MODULE_LICENSE("GPL v2");
projects / openwrt / staging / ldir.git / blobdiff