[linux-block.git] / drivers / mfd / intel-m10-bmc-spi.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Intel MAX 10 Board Management Controller chip
 *
 * Copyright (C) 2018-2020 Intel Corporation. All rights reserved.
 */
#include <linux/bitfield.h>
#include <linux/dev_printk.h>
#include <linux/init.h>
#include <linux/mfd/core.h>
#include <linux/mfd/intel-m10-bmc.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>

static const struct regmap_range m10bmc_regmap_range[] = {
	regmap_reg_range(M10BMC_LEGACY_BUILD_VER, M10BMC_LEGACY_BUILD_VER),
	regmap_reg_range(M10BMC_SYS_BASE, M10BMC_SYS_END),
	regmap_reg_range(M10BMC_FLASH_BASE, M10BMC_FLASH_END),
};

static const struct regmap_access_table m10bmc_access_table = {
	.yes_ranges	= m10bmc_regmap_range,
	.n_yes_ranges	= ARRAY_SIZE(m10bmc_regmap_range),
};

static struct regmap_config intel_m10bmc_regmap_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
	.wr_table = &m10bmc_access_table,
	.rd_table = &m10bmc_access_table,
	.max_register = M10BMC_MEM_END,
};

static int check_m10bmc_version(struct intel_m10bmc *ddata)
{
	unsigned int v;
	int ret;

	/*
	 * This check is to filter out the very old legacy BMC versions. In the
	 * old BMC chips, the BMC version info is stored in the old version
	 * register (M10BMC_LEGACY_BUILD_VER), so its read out value would have
	 * not been M10BMC_VER_LEGACY_INVALID (0xffffffff). But in new BMC
	 * chips that the driver supports, the value of this register should be
	 * M10BMC_VER_LEGACY_INVALID.
	 */
	ret = m10bmc_raw_read(ddata, M10BMC_LEGACY_BUILD_VER, &v);
	if (ret)
		return -ENODEV;

	if (v != M10BMC_VER_LEGACY_INVALID) {
		dev_err(ddata->dev, "bad version M10BMC detected\n");
		return -ENODEV;
	}

	return 0;
}

static int intel_m10_bmc_spi_probe(struct spi_device *spi)
{
	const struct spi_device_id *id = spi_get_device_id(spi);
	const struct intel_m10bmc_platform_info *info;
	struct device *dev = &spi->dev;
	struct intel_m10bmc *ddata;
	int ret;

	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
	if (!ddata)
		return -ENOMEM;

	info = (struct intel_m10bmc_platform_info *)id->driver_data;
	ddata->dev = dev;

	ddata->regmap = devm_regmap_init_spi_avmm(spi, &intel_m10bmc_regmap_config);
	if (IS_ERR(ddata->regmap)) {
		ret = PTR_ERR(ddata->regmap);
		dev_err(dev, "Failed to allocate regmap: %d\n", ret);
		return ret;
	}

	spi_set_drvdata(spi, ddata);

	ret = check_m10bmc_version(ddata);
	if (ret) {
		dev_err(dev, "Failed to identify m10bmc hardware\n");
		return ret;
	}

	return m10bmc_dev_init(ddata, info);
}

static struct mfd_cell m10bmc_d5005_subdevs[] = {
	{ .name = "d5005bmc-hwmon" },
	{ .name = "d5005bmc-sec-update" },
};

static struct mfd_cell m10bmc_pacn3000_subdevs[] = {
	{ .name = "n3000bmc-hwmon" },
	{ .name = "n3000bmc-retimer" },
	{ .name = "n3000bmc-sec-update" },
};

static struct mfd_cell m10bmc_n5010_subdevs[] = {
	{ .name = "n5010bmc-hwmon" },
};

static const struct intel_m10bmc_platform_info m10bmc_spi_n3000 = {
	.cells = m10bmc_pacn3000_subdevs,
	.n_cells = ARRAY_SIZE(m10bmc_pacn3000_subdevs),
};

static const struct intel_m10bmc_platform_info m10bmc_spi_d5005 = {
	.cells = m10bmc_d5005_subdevs,
	.n_cells = ARRAY_SIZE(m10bmc_d5005_subdevs),
};

static const struct intel_m10bmc_platform_info m10bmc_spi_n5010 = {
	.cells = m10bmc_n5010_subdevs,
	.n_cells = ARRAY_SIZE(m10bmc_n5010_subdevs),
};

static const struct spi_device_id m10bmc_spi_id[] = {
	{ "m10-n3000", (kernel_ulong_t)&m10bmc_spi_n3000 },
	{ "m10-d5005", (kernel_ulong_t)&m10bmc_spi_d5005 },
	{ "m10-n5010", (kernel_ulong_t)&m10bmc_spi_n5010 },
	{ }
};
MODULE_DEVICE_TABLE(spi, m10bmc_spi_id);

static struct spi_driver intel_m10bmc_spi_driver = {
	.driver = {
		.name = "intel-m10-bmc",
		.dev_groups = m10bmc_dev_groups,
	},
	.probe = intel_m10_bmc_spi_probe,
	.id_table = m10bmc_spi_id,
};
module_spi_driver(intel_m10bmc_spi_driver);

MODULE_DESCRIPTION("Intel MAX 10 BMC SPI bus interface");
MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:intel-m10-bmc");
Commit	Line	Data
876611c4 XY	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Intel MAX 10 Board Management Controller chip
	4	*
	5	* Copyright (C) 2018-2020 Intel Corporation. All rights reserved.
	6	*/
	7	#include <linux/bitfield.h>
603aed8f	8	#include <linux/dev_printk.h>
876611c4 XY	9	#include <linux/init.h>
	10	#include <linux/mfd/core.h>
	11	#include <linux/mfd/intel-m10-bmc.h>
	12	#include <linux/module.h>
876611c4 XY	13	#include <linux/regmap.h>
	14	#include <linux/spi/spi.h>
	15
8169f74c MG	16	static const struct regmap_range m10bmc_regmap_range[] = {
	17	regmap_reg_range(M10BMC_LEGACY_BUILD_VER, M10BMC_LEGACY_BUILD_VER),
	18	regmap_reg_range(M10BMC_SYS_BASE, M10BMC_SYS_END),
	19	regmap_reg_range(M10BMC_FLASH_BASE, M10BMC_FLASH_END),
	20	};
	21
	22	static const struct regmap_access_table m10bmc_access_table = {
	23	.yes_ranges = m10bmc_regmap_range,
	24	.n_yes_ranges = ARRAY_SIZE(m10bmc_regmap_range),
	25	};
	26
876611c4 XY	27	static struct regmap_config intel_m10bmc_regmap_config = {
	28	.reg_bits = 32,
	29	.val_bits = 32,
	30	.reg_stride = 4,
8169f74c MG	31	.wr_table = &m10bmc_access_table,
8169f74c MG	32	.rd_table = &m10bmc_access_table,
876611c4 XY	33	.max_register = M10BMC_MEM_END,
	34	};
	35
876611c4 XY	36	static int check_m10bmc_version(struct intel_m10bmc *ddata)
	37	{
	38	unsigned int v;
	39	int ret;
	40
	41	/*
5893f4d1 XY	42	* This check is to filter out the very old legacy BMC versions. In the
	43	* old BMC chips, the BMC version info is stored in the old version
	44	* register (M10BMC_LEGACY_BUILD_VER), so its read out value would have
	45	* not been M10BMC_VER_LEGACY_INVALID (0xffffffff). But in new BMC
	46	* chips that the driver supports, the value of this register should be
	47	* M10BMC_VER_LEGACY_INVALID.
876611c4	48	*/
5893f4d1	49	ret = m10bmc_raw_read(ddata, M10BMC_LEGACY_BUILD_VER, &v);
876611c4 XY	50	if (ret)
	51	return -ENODEV;
	52
	53	if (v != M10BMC_VER_LEGACY_INVALID) {
	54	dev_err(ddata->dev, "bad version M10BMC detected\n");
	55	return -ENODEV;
	56	}
	57
	58	return 0;
	59	}
	60
	61	static int intel_m10_bmc_spi_probe(struct spi_device *spi)
	62	{
	63	const struct spi_device_id *id = spi_get_device_id(spi);
16e5d95a	64	const struct intel_m10bmc_platform_info *info;
876611c4	65	struct device *dev = &spi->dev;
876611c4	66	struct intel_m10bmc *ddata;
16e5d95a	67	int ret;
876611c4 XY	68
	69	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
	70	if (!ddata)
	71	return -ENOMEM;
	72
16e5d95a	73	info = (struct intel_m10bmc_platform_info *)id->driver_data;
876611c4 XY	74	ddata->dev = dev;
876611c4 XY	75
603aed8f	76	ddata->regmap = devm_regmap_init_spi_avmm(spi, &intel_m10bmc_regmap_config);
876611c4 XY	77	if (IS_ERR(ddata->regmap)) {
	78	ret = PTR_ERR(ddata->regmap);
	79	dev_err(dev, "Failed to allocate regmap: %d\n", ret);
	80	return ret;
	81	}
	82
	83	spi_set_drvdata(spi, ddata);
	84
	85	ret = check_m10bmc_version(ddata);
	86	if (ret) {
	87	dev_err(dev, "Failed to identify m10bmc hardware\n");
	88	return ret;
	89	}
	90
603aed8f	91	return m10bmc_dev_init(ddata, info);
876611c4 XY	92	}
876611c4 XY	93
603aed8f IJ	94	static struct mfd_cell m10bmc_d5005_subdevs[] = {
	95	{ .name = "d5005bmc-hwmon" },
	96	{ .name = "d5005bmc-sec-update" },
	97	};
	98
	99	static struct mfd_cell m10bmc_pacn3000_subdevs[] = {
	100	{ .name = "n3000bmc-hwmon" },
	101	{ .name = "n3000bmc-retimer" },
	102	{ .name = "n3000bmc-sec-update" },
	103	};
	104
	105	static struct mfd_cell m10bmc_n5010_subdevs[] = {
	106	{ .name = "n5010bmc-hwmon" },
	107	};
	108
16e5d95a IJ	109	static const struct intel_m10bmc_platform_info m10bmc_spi_n3000 = {
	110	.cells = m10bmc_pacn3000_subdevs,
	111	.n_cells = ARRAY_SIZE(m10bmc_pacn3000_subdevs),
	112	};
	113
	114	static const struct intel_m10bmc_platform_info m10bmc_spi_d5005 = {
	115	.cells = m10bmc_d5005_subdevs,
	116	.n_cells = ARRAY_SIZE(m10bmc_d5005_subdevs),
	117	};
	118
	119	static const struct intel_m10bmc_platform_info m10bmc_spi_n5010 = {
	120	.cells = m10bmc_n5010_subdevs,
	121	.n_cells = ARRAY_SIZE(m10bmc_n5010_subdevs),
	122	};
	123
876611c4	124	static const struct spi_device_id m10bmc_spi_id[] = {
16e5d95a IJ	125	{ "m10-n3000", (kernel_ulong_t)&m10bmc_spi_n3000 },
	126	{ "m10-d5005", (kernel_ulong_t)&m10bmc_spi_d5005 },
	127	{ "m10-n5010", (kernel_ulong_t)&m10bmc_spi_n5010 },
876611c4 XY	128	{ }
	129	};
	130	MODULE_DEVICE_TABLE(spi, m10bmc_spi_id);
	131
	132	static struct spi_driver intel_m10bmc_spi_driver = {
	133	.driver = {
	134	.name = "intel-m10-bmc",
603aed8f	135	.dev_groups = m10bmc_dev_groups,
876611c4 XY	136	},
	137	.probe = intel_m10_bmc_spi_probe,
	138	.id_table = m10bmc_spi_id,
	139	};
	140	module_spi_driver(intel_m10bmc_spi_driver);
	141
603aed8f	142	MODULE_DESCRIPTION("Intel MAX 10 BMC SPI bus interface");
876611c4 XY	143	MODULE_AUTHOR("Intel Corporation");
	144	MODULE_LICENSE("GPL v2");
	145	MODULE_ALIAS("spi:intel-m10-bmc");