[linux-block.git] / drivers / mcb / mcb-lpc.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * MEN Chameleon Bus.
 *
 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
 * Author: Andreas Werner <andreas.werner@men.de>
 */

#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/mcb.h>
#include <linux/io.h>
#include "mcb-internal.h"

struct priv {
	struct mcb_bus *bus;
	struct resource *mem;
	void __iomem *base;
};

static int mcb_lpc_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct priv *priv;
	int ret = 0, table_size;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!priv->mem) {
		dev_err(&pdev->dev, "No Memory resource\n");
		return -ENODEV;
	}

	res = devm_request_mem_region(&pdev->dev, priv->mem->start,
				      resource_size(priv->mem),
				      KBUILD_MODNAME);
	if (!res) {
		dev_err(&pdev->dev, "Failed to request IO memory\n");
		return -EBUSY;
	}

	priv->base = devm_ioremap(&pdev->dev, priv->mem->start,
				  resource_size(priv->mem));
	if (!priv->base) {
		dev_err(&pdev->dev, "Cannot ioremap\n");
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, priv);

	priv->bus = mcb_alloc_bus(&pdev->dev);
	if (IS_ERR(priv->bus))
		return PTR_ERR(priv->bus);

	ret = chameleon_parse_cells(priv->bus, priv->mem->start, priv->base);
	if (ret < 0) {
		goto out_mcb_bus;
	}

	table_size = ret;

	if (table_size < CHAM_HEADER_SIZE) {
		/* Release the previous resources */
		devm_iounmap(&pdev->dev, priv->base);
		devm_release_mem_region(&pdev->dev, priv->mem->start, resource_size(priv->mem));

		/* Then, allocate it again with the actual chameleon table size */
		res = devm_request_mem_region(&pdev->dev, priv->mem->start,
					      table_size,
					      KBUILD_MODNAME);
		if (!res) {
			dev_err(&pdev->dev, "Failed to request PCI memory\n");
			ret = -EBUSY;
			goto out_mcb_bus;
		}

		priv->base = devm_ioremap(&pdev->dev, priv->mem->start, table_size);
		if (!priv->base) {
			dev_err(&pdev->dev, "Cannot ioremap\n");
			ret = -ENOMEM;
			goto out_mcb_bus;
		}

		platform_set_drvdata(pdev, priv);
	}

	mcb_bus_add_devices(priv->bus);

	return 0;

out_mcb_bus:
	mcb_release_bus(priv->bus);
	return ret;
}

static int mcb_lpc_remove(struct platform_device *pdev)
{
	struct priv *priv = platform_get_drvdata(pdev);

	mcb_release_bus(priv->bus);

	return 0;
}

static struct platform_device *mcb_lpc_pdev;

static int mcb_lpc_create_platform_device(const struct dmi_system_id *id)
{
	struct resource *res = id->driver_data;
	int ret;

	mcb_lpc_pdev = platform_device_alloc("mcb-lpc", -1);
	if (!mcb_lpc_pdev)
		return -ENOMEM;

	ret = platform_device_add_resources(mcb_lpc_pdev, res, 1);
	if (ret)
		goto out_put;

	ret = platform_device_add(mcb_lpc_pdev);
	if (ret)
		goto out_put;

	return 0;

out_put:
	platform_device_put(mcb_lpc_pdev);
	return ret;
}

static struct resource sc24_fpga_resource = DEFINE_RES_MEM(0xe000e000, CHAM_HEADER_SIZE);
static struct resource sc31_fpga_resource = DEFINE_RES_MEM(0xf000e000, CHAM_HEADER_SIZE);

static struct platform_driver mcb_lpc_driver = {
	.driver		= {
		.name = "mcb-lpc",
	},
	.probe		= mcb_lpc_probe,
	.remove		= mcb_lpc_remove,
};

static const struct dmi_system_id mcb_lpc_dmi_table[] = {
	{
		.ident = "SC24",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
			DMI_MATCH(DMI_PRODUCT_VERSION, "14SC24"),
		},
		.driver_data = (void *)&sc24_fpga_resource,
		.callback = mcb_lpc_create_platform_device,
	},
	{
		.ident = "SC31",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
			DMI_MATCH(DMI_PRODUCT_VERSION, "14SC31"),
		},
		.driver_data = (void *)&sc31_fpga_resource,
		.callback = mcb_lpc_create_platform_device,
	},
	{}
};
MODULE_DEVICE_TABLE(dmi, mcb_lpc_dmi_table);

static int __init mcb_lpc_init(void)
{
	if (!dmi_check_system(mcb_lpc_dmi_table))
		return -ENODEV;

	return platform_driver_register(&mcb_lpc_driver);
}

static void __exit mcb_lpc_exit(void)
{
	platform_device_unregister(mcb_lpc_pdev);
	platform_driver_unregister(&mcb_lpc_driver);
}

module_init(mcb_lpc_init);
module_exit(mcb_lpc_exit);

MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MCB over LPC support");
MODULE_IMPORT_NS(MCB);
Commit	Line	Data
b886d83c	1	// SPDX-License-Identifier: GPL-2.0-only
73edc8f7 AW	2	/*
	3	* MEN Chameleon Bus.
	4	*
	5	* Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
	6	* Author: Andreas Werner <andreas.werner@men.de>
73edc8f7 AW	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
	16	struct priv {
	17	struct mcb_bus *bus;
	18	struct resource *mem;
	19	void __iomem *base;
	20	};
	21
	22	static int mcb_lpc_probe(struct platform_device *pdev)
	23	{
	24	struct resource *res;
	25	struct priv *priv;
2025b2ca	26	int ret = 0, table_size;
73edc8f7 AW	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) {
2025b2ca	61	goto out_mcb_bus;
73edc8f7 AW	62	}
73edc8f7 AW	63
2025b2ca RBJJ	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	}
73edc8f7 AW	90
	91	mcb_bus_add_devices(priv->bus);
	92
	93	return 0;
	94
2025b2ca RBJJ	95	out_mcb_bus:
	96	mcb_release_bus(priv->bus);
	97	return ret;
73edc8f7 AW	98	}
	99
	100	static 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
	109	static struct platform_device *mcb_lpc_pdev;
	110
	111	static 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
	130	out_put:
	131	platform_device_put(mcb_lpc_pdev);
	132	return ret;
	133	}
	134
6f746d48 ZL	135	static struct resource sc24_fpga_resource = DEFINE_RES_MEM(0xe000e000, CHAM_HEADER_SIZE);
6f746d48 ZL	136	static struct resource sc31_fpga_resource = DEFINE_RES_MEM(0xf000e000, CHAM_HEADER_SIZE);
acf5e051	137
73edc8f7 AW	138	static 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
	146	static 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	},
acf5e051 MM	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	},
73edc8f7 AW	165	{}
	166	};
	167	MODULE_DEVICE_TABLE(dmi, mcb_lpc_dmi_table);
	168
	169	static 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
	177	static void __exit mcb_lpc_exit(void)
	178	{
	179	platform_device_unregister(mcb_lpc_pdev);
	180	platform_driver_unregister(&mcb_lpc_driver);
	181	}
	182
	183	module_init(mcb_lpc_init);
	184	module_exit(mcb_lpc_exit);
	185
	186	MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
	187	MODULE_LICENSE("GPL");
	188	MODULE_DESCRIPTION("MCB over LPC support");
891e6036	189	MODULE_IMPORT_NS(MCB);