1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * MEN Chameleon Bus.
  4 *
  5 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
  6 * Author: Andreas Werner <andreas.werner@men.de>
  7 */
  8
  9#include <linux/platform_device.h>
 10#include <linux/module.h>
 11#include <linux/dmi.h>
 12#include <linux/mcb.h>
 13#include <linux/io.h>
 14#include "mcb-internal.h"
 15
 16struct priv {
 17	struct mcb_bus *bus;
 18	struct resource *mem;
 19	void __iomem *base;
 20};
 21
 22static int mcb_lpc_probe(struct platform_device *pdev)
 23{
 24	struct resource *res;
 25	struct priv *priv;
 26	int ret = 0;
 27
 28	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 29	if (!priv)
 30		return -ENOMEM;
 31
 32	priv->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 33	if (!priv->mem) {
 34		dev_err(&pdev->dev, "No Memory resource\n");
 35		return -ENODEV;
 36	}
 37
 38	res = devm_request_mem_region(&pdev->dev, priv->mem->start,
 39				      resource_size(priv->mem),
 40				      KBUILD_MODNAME);
 41	if (!res) {
 42		dev_err(&pdev->dev, "Failed to request IO memory\n");
 43		return -EBUSY;
 44	}
 45
 46	priv->base = devm_ioremap(&pdev->dev, priv->mem->start,
 47				  resource_size(priv->mem));
 48	if (!priv->base) {
 49		dev_err(&pdev->dev, "Cannot ioremap\n");
 50		return -ENOMEM;
 51	}
 52
 53	platform_set_drvdata(pdev, priv);
 54
 55	priv->bus = mcb_alloc_bus(&pdev->dev);
 56	if (IS_ERR(priv->bus))
 57		return PTR_ERR(priv->bus);
 58
 59	ret = chameleon_parse_cells(priv->bus, priv->mem->start, priv->base);
 60	if (ret < 0) {
 61		mcb_release_bus(priv->bus);
 62		return ret;
 63	}
 64
 65	dev_dbg(&pdev->dev, "Found %d cells\n", ret);
 66
 67	mcb_bus_add_devices(priv->bus);
 68
 69	return 0;
 70
 71}
 72
 73static int mcb_lpc_remove(struct platform_device *pdev)
 74{
 75	struct priv *priv = platform_get_drvdata(pdev);
 76
 77	mcb_release_bus(priv->bus);
 78
 79	return 0;
 80}
 81
 82static struct platform_device *mcb_lpc_pdev;
 83
 84static int mcb_lpc_create_platform_device(const struct dmi_system_id *id)
 85{
 86	struct resource *res = id->driver_data;
 87	int ret;
 88
 89	mcb_lpc_pdev = platform_device_alloc("mcb-lpc", -1);
 90	if (!mcb_lpc_pdev)
 91		return -ENOMEM;
 92
 93	ret = platform_device_add_resources(mcb_lpc_pdev, res, 1);
 94	if (ret)
 95		goto out_put;
 96
 97	ret = platform_device_add(mcb_lpc_pdev);
 98	if (ret)
 99		goto out_put;
100
101	return 0;
102
103out_put:
104	platform_device_put(mcb_lpc_pdev);
105	return ret;
106}
107
108static struct resource sc24_fpga_resource = DEFINE_RES_MEM(0xe000e000, CHAM_HEADER_SIZE);
109static struct resource sc31_fpga_resource = DEFINE_RES_MEM(0xf000e000, CHAM_HEADER_SIZE);
110
111static struct platform_driver mcb_lpc_driver = {
112	.driver		= {
113		.name = "mcb-lpc",
114	},
115	.probe		= mcb_lpc_probe,
116	.remove		= mcb_lpc_remove,
117};
118
119static const struct dmi_system_id mcb_lpc_dmi_table[] = {
120	{
121		.ident = "SC24",
122		.matches = {
123			DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
124			DMI_MATCH(DMI_PRODUCT_VERSION, "14SC24"),
125		},
126		.driver_data = (void *)&sc24_fpga_resource,
127		.callback = mcb_lpc_create_platform_device,
128	},
129	{
130		.ident = "SC31",
131		.matches = {
132			DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
133			DMI_MATCH(DMI_PRODUCT_VERSION, "14SC31"),
134		},
135		.driver_data = (void *)&sc31_fpga_resource,
136		.callback = mcb_lpc_create_platform_device,
137	},
138	{}
139};
140MODULE_DEVICE_TABLE(dmi, mcb_lpc_dmi_table);
141
142static int __init mcb_lpc_init(void)
143{
144	if (!dmi_check_system(mcb_lpc_dmi_table))
145		return -ENODEV;
146
147	return platform_driver_register(&mcb_lpc_driver);
148}
149
150static void __exit mcb_lpc_exit(void)
151{
152	platform_device_unregister(mcb_lpc_pdev);
153	platform_driver_unregister(&mcb_lpc_driver);
154}
155
156module_init(mcb_lpc_init);
157module_exit(mcb_lpc_exit);
158
159MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
160MODULE_LICENSE("GPL");
161MODULE_DESCRIPTION("MCB over LPC support");
162MODULE_IMPORT_NS(MCB);