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	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 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
127static 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
139static const struct vsc73xx_ops vsc73xx_platform_ops = {
140	.read = vsc73xx_platform_read,
141	.write = vsc73xx_platform_write,
142};
143
144static 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};
159MODULE_DEVICE_TABLE(of, vsc73xx_of_match);
160
161static 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};
170module_platform_driver(vsc73xx_platform_driver);
171
172MODULE_AUTHOR("Pawel Dembicki <paweldembicki@gmail.com>");
173MODULE_DESCRIPTION("Vitesse VSC7385/7388/7395/7398 Platform driver");
174MODULE_LICENSE("GPL v2");