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