target/linux/bmips/patches-5.10/047-v5.13-net-mdio-Add-BCM6368-MDIO-mux-bus-controller.patch

   1 From e239756717b5c866958823a1609e2ccf268435be Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
   3 Date: Mon, 15 Mar 2021 16:45:28 +0100
   4 Subject: [PATCH 2/2] net: mdio: Add BCM6368 MDIO mux bus controller
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 This controller is present on BCM6318, BCM6328, BCM6362, BCM6368 and BCM63268
  10 SoCs.
  11
  12 Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
  13 Signed-off-by: David S. Miller <davem@davemloft.net>
  14 ---
  15  drivers/net/mdio/Kconfig            |  11 ++
  16  drivers/net/mdio/Makefile           |   1 +
  17  drivers/net/mdio/mdio-mux-bcm6368.c | 184 ++++++++++++++++++++++++++++
  18  3 files changed, 196 insertions(+)
  19  create mode 100644 drivers/net/mdio/mdio-mux-bcm6368.c
  20
  21 --- a/drivers/net/mdio/Kconfig
  22 +++ b/drivers/net/mdio/Kconfig
  23 @@ -200,6 +200,17 @@ config MDIO_BUS_MUX_MESON_G12A
  24           the amlogic g12a SoC. The multiplexers connects either the external
  25           or the internal MDIO bus to the parent bus.
  26
  27 +config MDIO_BUS_MUX_BCM6368
  28 +       tristate "Broadcom BCM6368 MDIO bus multiplexers"
  29 +       depends on OF && OF_MDIO && (BMIPS_GENERIC || COMPILE_TEST)
  30 +       select MDIO_BUS_MUX
  31 +       default BMIPS_GENERIC
  32 +       help
  33 +         This module provides a driver for MDIO bus multiplexers found in
  34 +         BCM6368 based Broadcom SoCs. This multiplexer connects one of several
  35 +         child MDIO bus to a parent bus. Buses could be internal as well as
  36 +         external and selection logic lies inside the same multiplexer.
  37 +
  38  config MDIO_BUS_MUX_BCM_IPROC
  39         tristate "Broadcom iProc based MDIO bus multiplexers"
  40         depends on OF && OF_MDIO && (ARCH_BCM_IPROC || COMPILE_TEST)
  41 --- a/drivers/net/mdio/Makefile
  42 +++ b/drivers/net/mdio/Makefile
  43 @@ -22,6 +22,7 @@ obj-$(CONFIG_MDIO_THUNDER)            += mdio-thun
  44  obj-$(CONFIG_MDIO_XGENE)               += mdio-xgene.o
  45
  46  obj-$(CONFIG_MDIO_BUS_MUX)             += mdio-mux.o
  47 +obj-$(CONFIG_MDIO_BUS_MUX_BCM6368)     += mdio-mux-bcm6368.o
  48  obj-$(CONFIG_MDIO_BUS_MUX_BCM_IPROC)   += mdio-mux-bcm-iproc.o
  49  obj-$(CONFIG_MDIO_BUS_MUX_GPIO)                += mdio-mux-gpio.o
  50  obj-$(CONFIG_MDIO_BUS_MUX_MESON_G12A)  += mdio-mux-meson-g12a.o
  51 --- /dev/null
  52 +++ b/drivers/net/mdio/mdio-mux-bcm6368.c
  53 @@ -0,0 +1,184 @@
  54 +// SPDX-License-Identifier: GPL-2.0+
  55 +/*
  56 + * Broadcom BCM6368 mdiomux bus controller driver
  57 + *
  58 + * Copyright (C) 2021 Álvaro Fernández Rojas <noltari@gmail.com>
  59 + */
  60 +
  61 +#include <linux/delay.h>
  62 +#include <linux/io.h>
  63 +#include <linux/kernel.h>
  64 +#include <linux/mdio-mux.h>
  65 +#include <linux/module.h>
  66 +#include <linux/of.h>
  67 +#include <linux/of_platform.h>
  68 +#include <linux/of_mdio.h>
  69 +#include <linux/phy.h>
  70 +#include <linux/platform_device.h>
  71 +#include <linux/sched.h>
  72 +
  73 +#define MDIOC_REG              0x0
  74 +#define MDIOC_EXT_MASK         BIT(16)
  75 +#define MDIOC_REG_SHIFT                20
  76 +#define MDIOC_PHYID_SHIFT      25
  77 +#define MDIOC_RD_MASK          BIT(30)
  78 +#define MDIOC_WR_MASK          BIT(31)
  79 +
  80 +#define MDIOD_REG              0x4
  81 +
  82 +struct bcm6368_mdiomux_desc {
  83 +       void *mux_handle;
  84 +       void __iomem *base;
  85 +       struct device *dev;
  86 +       struct mii_bus *mii_bus;
  87 +       int ext_phy;
  88 +};
  89 +
  90 +static int bcm6368_mdiomux_read(struct mii_bus *bus, int phy_id, int loc)
  91 +{
  92 +       struct bcm6368_mdiomux_desc *md = bus->priv;
  93 +       uint32_t reg;
  94 +       int ret;
  95 +
  96 +       __raw_writel(0, md->base + MDIOC_REG);
  97 +
  98 +       reg = MDIOC_RD_MASK |
  99 +             (phy_id << MDIOC_PHYID_SHIFT) |
 100 +             (loc << MDIOC_REG_SHIFT);
 101 +       if (md->ext_phy)
 102 +               reg |= MDIOC_EXT_MASK;
 103 +
 104 +       __raw_writel(reg, md->base + MDIOC_REG);
 105 +       udelay(50);
 106 +       ret = __raw_readw(md->base + MDIOD_REG);
 107 +
 108 +       return ret;
 109 +}
 110 +
 111 +static int bcm6368_mdiomux_write(struct mii_bus *bus, int phy_id, int loc,
 112 +                                uint16_t val)
 113 +{
 114 +       struct bcm6368_mdiomux_desc *md = bus->priv;
 115 +       uint32_t reg;
 116 +
 117 +       __raw_writel(0, md->base + MDIOC_REG);
 118 +
 119 +       reg = MDIOC_WR_MASK |
 120 +             (phy_id << MDIOC_PHYID_SHIFT) |
 121 +             (loc << MDIOC_REG_SHIFT);
 122 +       if (md->ext_phy)
 123 +               reg |= MDIOC_EXT_MASK;
 124 +       reg |= val;
 125 +
 126 +       __raw_writel(reg, md->base + MDIOC_REG);
 127 +       udelay(50);
 128 +
 129 +       return 0;
 130 +}
 131 +
 132 +static int bcm6368_mdiomux_switch_fn(int current_child, int desired_child,
 133 +                                    void *data)
 134 +{
 135 +       struct bcm6368_mdiomux_desc *md = data;
 136 +
 137 +       md->ext_phy = desired_child;
 138 +
 139 +       return 0;
 140 +}
 141 +
 142 +static int bcm6368_mdiomux_probe(struct platform_device *pdev)
 143 +{
 144 +       struct bcm6368_mdiomux_desc *md;
 145 +       struct mii_bus *bus;
 146 +       struct resource *res;
 147 +       int rc;
 148 +
 149 +       md = devm_kzalloc(&pdev->dev, sizeof(*md), GFP_KERNEL);
 150 +       if (!md)
 151 +               return -ENOMEM;
 152 +       md->dev = &pdev->dev;
 153 +
 154 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 155 +       if (!res)
 156 +               return -EINVAL;
 157 +
 158 +       /*
 159 +        * Just ioremap, as this MDIO block is usually integrated into an
 160 +        * Ethernet MAC controller register range
 161 +        */
 162 +       md->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 163 +       if (!md->base) {
 164 +               dev_err(&pdev->dev, "failed to ioremap register\n");
 165 +               return -ENOMEM;
 166 +       }
 167 +
 168 +       md->mii_bus = devm_mdiobus_alloc(&pdev->dev);
 169 +       if (!md->mii_bus) {
 170 +               dev_err(&pdev->dev, "mdiomux bus alloc failed\n");
 171 +               return ENOMEM;
 172 +       }
 173 +
 174 +       bus = md->mii_bus;
 175 +       bus->priv = md;
 176 +       bus->name = "BCM6368 MDIO mux bus";
 177 +       snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d", pdev->name, pdev->id);
 178 +       bus->parent = &pdev->dev;
 179 +       bus->read = bcm6368_mdiomux_read;
 180 +       bus->write = bcm6368_mdiomux_write;
 181 +       bus->phy_mask = 0x3f;
 182 +       bus->dev.of_node = pdev->dev.of_node;
 183 +
 184 +       rc = mdiobus_register(bus);
 185 +       if (rc) {
 186 +               dev_err(&pdev->dev, "mdiomux registration failed\n");
 187 +               return rc;
 188 +       }
 189 +
 190 +       platform_set_drvdata(pdev, md);
 191 +
 192 +       rc = mdio_mux_init(md->dev, md->dev->of_node,
 193 +                          bcm6368_mdiomux_switch_fn, &md->mux_handle, md,
 194 +                          md->mii_bus);
 195 +       if (rc) {
 196 +               dev_info(md->dev, "mdiomux initialization failed\n");
 197 +               goto out_register;
 198 +       }
 199 +
 200 +       dev_info(&pdev->dev, "Broadcom BCM6368 MDIO mux bus\n");
 201 +
 202 +       return 0;
 203 +
 204 +out_register:
 205 +       mdiobus_unregister(bus);
 206 +       return rc;
 207 +}
 208 +
 209 +static int bcm6368_mdiomux_remove(struct platform_device *pdev)
 210 +{
 211 +       struct bcm6368_mdiomux_desc *md = platform_get_drvdata(pdev);
 212 +
 213 +       mdio_mux_uninit(md->mux_handle);
 214 +       mdiobus_unregister(md->mii_bus);
 215 +
 216 +       return 0;
 217 +}
 218 +
 219 +static const struct of_device_id bcm6368_mdiomux_ids[] = {
 220 +       { .compatible = "brcm,bcm6368-mdio-mux", },
 221 +       { /* sentinel */ }
 222 +};
 223 +MODULE_DEVICE_TABLE(of, bcm6368_mdiomux_ids);
 224 +
 225 +static struct platform_driver bcm6368_mdiomux_driver = {
 226 +       .driver = {
 227 +               .name = "bcm6368-mdio-mux",
 228 +               .of_match_table = bcm6368_mdiomux_ids,
 229 +       },
 230 +       .probe  = bcm6368_mdiomux_probe,
 231 +       .remove = bcm6368_mdiomux_remove,
 232 +};
 233 +module_platform_driver(bcm6368_mdiomux_driver);
 234 +
 235 +MODULE_AUTHOR("Álvaro Fernández Rojas <noltari@gmail.com>");
 236 +MODULE_DESCRIPTION("BCM6368 mdiomux bus controller driver");
 237 +MODULE_LICENSE("GPL v2");