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
vsc73xx_make_addr(u8 block,u8 subblock,u8 reg)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
vsc73xx_platform_read(struct vsc73xx * vsc,u8 block,u8 subblock,u8 reg,u32 * val)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
vsc73xx_platform_write(struct vsc73xx * vsc,u8 block,u8 subblock,u8 reg,u32 val)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
vsc73xx_platform_probe(struct platform_device * pdev)88 static 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
vsc73xx_platform_remove(struct platform_device * pdev)115 static int 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 0;
121
122 vsc73xx_remove(&vsc_platform->vsc);
123
124 return 0;
125 }
126
vsc73xx_platform_shutdown(struct platform_device * pdev)127 static void vsc73xx_platform_shutdown(struct platform_device *pdev)
128 {
129 struct vsc73xx_platform *vsc_platform = platform_get_drvdata(pdev);
130
131 if (!vsc_platform)
132 return;
133
134 vsc73xx_shutdown(&vsc_platform->vsc);
135
136 platform_set_drvdata(pdev, NULL);
137 }
138
139 static const struct vsc73xx_ops vsc73xx_platform_ops = {
140 .read = vsc73xx_platform_read,
141 .write = vsc73xx_platform_write,
142 };
143
144 static const struct of_device_id vsc73xx_of_match[] = {
145 {
146 .compatible = "vitesse,vsc7385",
147 },
148 {
149 .compatible = "vitesse,vsc7388",
150 },
151 {
152 .compatible = "vitesse,vsc7395",
153 },
154 {
155 .compatible = "vitesse,vsc7398",
156 },
157 { },
158 };
159 MODULE_DEVICE_TABLE(of, vsc73xx_of_match);
160
161 static struct platform_driver vsc73xx_platform_driver = {
162 .probe = vsc73xx_platform_probe,
163 .remove = vsc73xx_platform_remove,
164 .shutdown = vsc73xx_platform_shutdown,
165 .driver = {
166 .name = "vsc73xx-platform",
167 .of_match_table = vsc73xx_of_match,
168 },
169 };
170 module_platform_driver(vsc73xx_platform_driver);
171
172 MODULE_AUTHOR("Pawel Dembicki <paweldembicki@gmail.com>");
173 MODULE_DESCRIPTION("Vitesse VSC7385/7388/7395/7398 Platform driver");
174 MODULE_LICENSE("GPL v2");
175