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"); 165