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  */
  34 struct vsc73xx_platform {
  35         struct platform_device  *pdev;
  36         void __iomem            *base_addr;
  37         struct vsc73xx          vsc;
  38 };
  39
  40 static const struct vsc73xx_ops vsc73xx_platform_ops;
  41
  42 static 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
  55 static 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
  73 static 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
  88 static 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
 123 static 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
 130 static const struct vsc73xx_ops vsc73xx_platform_ops = {
 131         .read = vsc73xx_platform_read,
 132         .write = vsc73xx_platform_write,
 133 };
 134
 135 static 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 };
 150 MODULE_DEVICE_TABLE(of, vsc73xx_of_match);
 151
 152 static 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 };
 160 module_platform_driver(vsc73xx_platform_driver);
 161
 162 MODULE_AUTHOR("Pawel Dembicki <paweldembicki@gmail.com>");
 163 MODULE_DESCRIPTION("Vitesse VSC7385/7388/7395/7398 Platform driver");
 164 MODULE_LICENSE("GPL v2");