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, table_size;
 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		goto out_mcb_bus;
 62	}
 63
 64	table_size = ret;
 65
 66	if (table_size < CHAM_HEADER_SIZE) {
 67		/* Release the previous resources */
 68		devm_iounmap(&pdev->dev, priv->base);
 69		devm_release_mem_region(&pdev->dev, priv->mem->start, resource_size(priv->mem));
 70
 71		/* Then, allocate it again with the actual chameleon table size */
 72		res = devm_request_mem_region(&pdev->dev, priv->mem->start,
 73					      table_size,
 74					      KBUILD_MODNAME);
 75		if (!res) {
 76			dev_err(&pdev->dev, "Failed to request PCI memory\n");
 77			ret = -EBUSY;
 78			goto out_mcb_bus;
 79		}
 80
 81		priv->base = devm_ioremap(&pdev->dev, priv->mem->start, table_size);
 82		if (!priv->base) {
 83			dev_err(&pdev->dev, "Cannot ioremap\n");
 84			ret = -ENOMEM;
 85			goto out_mcb_bus;
 86		}
 87
 88		platform_set_drvdata(pdev, priv);
 89	}
 90
 91	mcb_bus_add_devices(priv->bus);
 92
 93	return 0;
 94
 95out_mcb_bus:
 96	mcb_release_bus(priv->bus);
 97	return ret;
 98}
 99
100static int mcb_lpc_remove(struct platform_device *pdev)
101{
102	struct priv *priv = platform_get_drvdata(pdev);
103
104	mcb_release_bus(priv->bus);
105
106	return 0;
107}
108
109static struct platform_device *mcb_lpc_pdev;
110
111static int mcb_lpc_create_platform_device(const struct dmi_system_id *id)
112{
113	struct resource *res = id->driver_data;
114	int ret;
115
116	mcb_lpc_pdev = platform_device_alloc("mcb-lpc", -1);
117	if (!mcb_lpc_pdev)
118		return -ENOMEM;
119
120	ret = platform_device_add_resources(mcb_lpc_pdev, res, 1);
121	if (ret)
122		goto out_put;
123
124	ret = platform_device_add(mcb_lpc_pdev);
125	if (ret)
126		goto out_put;
127
128	return 0;
129
130out_put:
131	platform_device_put(mcb_lpc_pdev);
132	return ret;
133}
134
135static struct resource sc24_fpga_resource = DEFINE_RES_MEM(0xe000e000, CHAM_HEADER_SIZE);
136static struct resource sc31_fpga_resource = DEFINE_RES_MEM(0xf000e000, CHAM_HEADER_SIZE);
137
138static struct platform_driver mcb_lpc_driver = {
139	.driver		= {
140		.name = "mcb-lpc",
141	},
142	.probe		= mcb_lpc_probe,
143	.remove		= mcb_lpc_remove,
144};
145
146static const struct dmi_system_id mcb_lpc_dmi_table[] = {
147	{
148		.ident = "SC24",
149		.matches = {
150			DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
151			DMI_MATCH(DMI_PRODUCT_VERSION, "14SC24"),
152		},
153		.driver_data = (void *)&sc24_fpga_resource,
154		.callback = mcb_lpc_create_platform_device,
155	},
156	{
157		.ident = "SC31",
158		.matches = {
159			DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
160			DMI_MATCH(DMI_PRODUCT_VERSION, "14SC31"),
161		},
162		.driver_data = (void *)&sc31_fpga_resource,
163		.callback = mcb_lpc_create_platform_device,
164	},
165	{}
166};
167MODULE_DEVICE_TABLE(dmi, mcb_lpc_dmi_table);
168
169static int __init mcb_lpc_init(void)
170{
171	if (!dmi_check_system(mcb_lpc_dmi_table))
172		return -ENODEV;
173
174	return platform_driver_register(&mcb_lpc_driver);
175}
176
177static void __exit mcb_lpc_exit(void)
178{
179	platform_device_unregister(mcb_lpc_pdev);
180	platform_driver_unregister(&mcb_lpc_driver);
181}
182
183module_init(mcb_lpc_init);
184module_exit(mcb_lpc_exit);
185
186MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
187MODULE_LICENSE("GPL");
188MODULE_DESCRIPTION("MCB over LPC support");
189MODULE_IMPORT_NS(MCB);