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1// SPDX-License-Identifier: GPL-2.02/* DSA driver for:3 * Vitesse VSC7385 SparX-G5 5+1-port Integrated Gigabit Ethernet Switch4 * Vitesse VSC7388 SparX-G8 8-port Integrated Gigabit Ethernet Switch5 * Vitesse VSC7395 SparX-G5e 5+1-port Integrated Gigabit Ethernet Switch6 * Vitesse VSC7398 SparX-G8e 8-port Integrated Gigabit Ethernet Switch7 *8 * This driver takes control of the switch chip connected over CPU-attached9 * address bus and configures it to route packages around when connected to10 * 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 1426#define VSC73XX_CMD_PLATFORM_BLOCK_MASK 0x727#define VSC73XX_CMD_PLATFORM_SUBBLOCK_SHIFT 1028#define VSC73XX_CMD_PLATFORM_SUBBLOCK_MASK 0xf29#define VSC73XX_CMD_PLATFORM_REGISTER_SHIFT 230 31/*32 * struct vsc73xx_platform - VSC73xx Platform state container33 */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 int ret;93 94 vsc_platform = devm_kzalloc(dev, sizeof(*vsc_platform), GFP_KERNEL);95 if (!vsc_platform)96 return -ENOMEM;97 98 platform_set_drvdata(pdev, vsc_platform);99 vsc_platform->pdev = pdev;100 vsc_platform->vsc.dev = dev;101 vsc_platform->vsc.priv = vsc_platform;102 vsc_platform->vsc.ops = &vsc73xx_platform_ops;103 104 /* obtain I/O memory space */105 vsc_platform->base_addr = devm_platform_ioremap_resource(pdev, 0);106 if (IS_ERR(vsc_platform->base_addr)) {107 dev_err(&pdev->dev, "cannot request I/O memory space\n");108 ret = -ENXIO;109 return ret;110 }111 112 return vsc73xx_probe(&vsc_platform->vsc);113}114 115static void vsc73xx_platform_remove(struct platform_device *pdev)116{117 struct vsc73xx_platform *vsc_platform = platform_get_drvdata(pdev);118 119 if (!vsc_platform)120 return;121 122 vsc73xx_remove(&vsc_platform->vsc);123}124 125static void vsc73xx_platform_shutdown(struct platform_device *pdev)126{127 struct vsc73xx_platform *vsc_platform = platform_get_drvdata(pdev);128 129 if (!vsc_platform)130 return;131 132 vsc73xx_shutdown(&vsc_platform->vsc);133 134 platform_set_drvdata(pdev, NULL);135}136 137static const struct vsc73xx_ops vsc73xx_platform_ops = {138 .read = vsc73xx_platform_read,139 .write = vsc73xx_platform_write,140};141 142static const struct of_device_id vsc73xx_of_match[] = {143 {144 .compatible = "vitesse,vsc7385",145 },146 {147 .compatible = "vitesse,vsc7388",148 },149 {150 .compatible = "vitesse,vsc7395",151 },152 {153 .compatible = "vitesse,vsc7398",154 },155 { },156};157MODULE_DEVICE_TABLE(of, vsc73xx_of_match);158 159static struct platform_driver vsc73xx_platform_driver = {160 .probe = vsc73xx_platform_probe,161 .remove_new = vsc73xx_platform_remove,162 .shutdown = vsc73xx_platform_shutdown,163 .driver = {164 .name = "vsc73xx-platform",165 .of_match_table = vsc73xx_of_match,166 },167};168module_platform_driver(vsc73xx_platform_driver);169 170MODULE_AUTHOR("Pawel Dembicki <paweldembicki@gmail.com>");171MODULE_DESCRIPTION("Vitesse VSC7385/7388/7395/7398 Platform driver");172MODULE_LICENSE("GPL v2");173