LXR linux/drivers/net/dsa/vitesse-vsc73xx-platform.c

   1// SPDX-License-Identifier: GPL-2.0
   2/* DSA driver for:
   3 * Vitesse VSC7385 SparX-G5 5+1-port Integrated Gigabit Ethernet Switch
   4 * Vitesse VSC7388 SparX-G8 8-port Integrated Gigabit Ethernet Switch
   5 * Vitesse VSC7395 SparX-G5e 5+1-port Integrated Gigabit Ethernet Switch
   6 * Vitesse VSC7398 SparX-G8e 8-port Integrated Gigabit Ethernet Switch
   7 *
   8 * This driver takes control of the switch chip connected over CPU-attached
   9 * address bus and configures it to route packages around when connected to
  10 * a CPU port.
  11 *
  12 * Copyright (C) 2019 Pawel Dembicki <paweldembicki@gmail.com>
  13 * Based on vitesse-vsc-spi.c by:
  14 * Copyright (C) 2018 Linus Wallej <linus.walleij@linaro.org>
  15 * Includes portions of code from the firmware uploader by:
  16 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
  17 */
  18#include <linux/kernel.h>
  19#include <linux/module.h>
  20#include <linux/of.h>
  21#include <linux/platform_device.h>
  22
  23#include "vitesse-vsc73xx.h"
  24
  25#define VSC73XX_CMD_PLATFORM_BLOCK_SHIFT                14
  26#define VSC73XX_CMD_PLATFORM_BLOCK_MASK                 0x7
  27#define VSC73XX_CMD_PLATFORM_SUBBLOCK_SHIFT             10
  28#define VSC73XX_CMD_PLATFORM_SUBBLOCK_MASK              0xf
  29#define VSC73XX_CMD_PLATFORM_REGISTER_SHIFT             2
  30
  31/**
  32 * struct vsc73xx_platform - VSC73xx Platform state container
  33 */
  34struct vsc73xx_platform {
  35        struct platform_device  *pdev;
  36        void __iomem            *base_addr;
  37        struct vsc73xx          vsc;
  38};
  39
  40static const struct vsc73xx_ops vsc73xx_platform_ops;
  41
  42static u32 vsc73xx_make_addr(u8 block, u8 subblock, u8 reg)
  43{
  44        u32 ret;
  45
  46        ret = (block & VSC73XX_CMD_PLATFORM_BLOCK_MASK)
  47            << VSC73XX_CMD_PLATFORM_BLOCK_SHIFT;
  48        ret |= (subblock & VSC73XX_CMD_PLATFORM_SUBBLOCK_MASK)
  49            << VSC73XX_CMD_PLATFORM_SUBBLOCK_SHIFT;
  50        ret |= reg << VSC73XX_CMD_PLATFORM_REGISTER_SHIFT;
  51
  52        return ret;
  53}
  54
  55static int vsc73xx_platform_read(struct vsc73xx *vsc, u8 block, u8 subblock,
  56                                 u8 reg, u32 *val)
  57{
  58        struct vsc73xx_platform *vsc_platform = vsc->priv;
  59        u32 offset;
  60
  61        if (!vsc73xx_is_addr_valid(block, subblock))
  62                return -EINVAL;
  63
  64        offset = vsc73xx_make_addr(block, subblock, reg);
  65        /* By default vsc73xx running in big-endian mode.
  66         * (See "Register Addressing" section 5.5.3 in the VSC7385 manual.)
  67         */
  68        *val = ioread32be(vsc_platform->base_addr + offset);
  69
  70        return 0;
  71}
  72
  73static int vsc73xx_platform_write(struct vsc73xx *vsc, u8 block, u8 subblock,
  74                                  u8 reg, u32 val)
  75{
  76        struct vsc73xx_platform *vsc_platform = vsc->priv;
  77        u32 offset;
  78
  79        if (!vsc73xx_is_addr_valid(block, subblock))
  80                return -EINVAL;
  81
  82        offset = vsc73xx_make_addr(block, subblock, reg);
  83        iowrite32be(val, vsc_platform->base_addr + offset);
  84
  85        return 0;
  86}
  87
  88static int vsc73xx_platform_probe(struct platform_device *pdev)
  89{
  90        struct device *dev = &pdev->dev;
  91        struct vsc73xx_platform *vsc_platform;
  92        struct resource *res = NULL;
  93        int ret;
  94
  95        vsc_platform = devm_kzalloc(dev, sizeof(*vsc_platform), GFP_KERNEL);
  96        if (!vsc_platform)
  97                return -ENOMEM;
  98
  99        platform_set_drvdata(pdev, vsc_platform);
 100        vsc_platform->pdev = pdev;
 101        vsc_platform->vsc.dev = dev;
 102        vsc_platform->vsc.priv = vsc_platform;
 103        vsc_platform->vsc.ops = &vsc73xx_platform_ops;
 104
 105        /* obtain I/O memory space */
 106        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 107        if (!res) {
 108                dev_err(&pdev->dev, "cannot obtain I/O memory space\n");
 109                ret = -ENXIO;
 110                return ret;
 111        }
 112
 113        vsc_platform->base_addr = devm_ioremap_resource(&pdev->dev, res);
 114        if (IS_ERR(vsc_platform->base_addr)) {
 115                dev_err(&pdev->dev, "cannot request I/O memory space\n");
 116                ret = -ENXIO;
 117                return ret;
 118        }
 119
 120        return vsc73xx_probe(&vsc_platform->vsc);
 121}
 122
 123static int vsc73xx_platform_remove(struct platform_device *pdev)
 124{
 125        struct vsc73xx_platform *vsc_platform = platform_get_drvdata(pdev);
 126
 127        return vsc73xx_remove(&vsc_platform->vsc);
 128}
 129
 130static const struct vsc73xx_ops vsc73xx_platform_ops = {
 131        .read = vsc73xx_platform_read,
 132        .write = vsc73xx_platform_write,
 133};
 134
 135static const struct of_device_id vsc73xx_of_match[] = {
 136        {
 137                .compatible = "vitesse,vsc7385",
 138        },
 139        {
 140                .compatible = "vitesse,vsc7388",
 141        },
 142        {
 143                .compatible = "vitesse,vsc7395",
 144        },
 145        {
 146                .compatible = "vitesse,vsc7398",
 147        },
 148        { },
 149};
 150MODULE_DEVICE_TABLE(of, vsc73xx_of_match);
 151
 152static struct platform_driver vsc73xx_platform_driver = {
 153        .probe = vsc73xx_platform_probe,
 154        .remove = vsc73xx_platform_remove,
 155        .driver = {
 156                .name = "vsc73xx-platform",
 157                .of_match_table = vsc73xx_of_match,
 158        },
 159};
 160module_platform_driver(vsc73xx_platform_driver);
 161
 162MODULE_AUTHOR("Pawel Dembicki <paweldembicki@gmail.com>");
 163MODULE_DESCRIPTION("Vitesse VSC7385/7388/7395/7398 Platform driver");
 164MODULE_LICENSE("GPL v2");
 165