tjh.dev
Linux kernel mirror (for testing)
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linux
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");