[linux-block.git] / drivers / nvmem / zynqmp_nvmem.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2019 Xilinx, Inc.
 */

#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/firmware/xlnx-zynqmp.h>

#define SILICON_REVISION_MASK 0xF

struct zynqmp_nvmem_data {
	struct device *dev;
	struct nvmem_device *nvmem;
};

static int zynqmp_nvmem_read(void *context, unsigned int offset,
			     void *val, size_t bytes)
{
	int ret;
	int idcode, version;
	struct zynqmp_nvmem_data *priv = context;

	ret = zynqmp_pm_get_chipid(&idcode, &version);
	if (ret < 0)
		return ret;

	dev_dbg(priv->dev, "Read chipid val %x %x\n", idcode, version);
	*(int *)val = version & SILICON_REVISION_MASK;

	return 0;
}

static struct nvmem_config econfig = {
	.name = "zynqmp-nvmem",
	.owner = THIS_MODULE,
	.word_size = 1,
	.size = 1,
	.read_only = true,
};

static const struct of_device_id zynqmp_nvmem_match[] = {
	{ .compatible = "xlnx,zynqmp-nvmem-fw", },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, zynqmp_nvmem_match);

static int zynqmp_nvmem_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct zynqmp_nvmem_data *priv;

	priv = devm_kzalloc(dev, sizeof(struct zynqmp_nvmem_data), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->dev = dev;
	econfig.dev = dev;
	econfig.reg_read = zynqmp_nvmem_read;
	econfig.priv = priv;

	priv->nvmem = devm_nvmem_register(dev, &econfig);

	return PTR_ERR_OR_ZERO(priv->nvmem);
}

static struct platform_driver zynqmp_nvmem_driver = {
	.probe = zynqmp_nvmem_probe,
	.driver = {
		.name = "zynqmp-nvmem",
		.of_match_table = zynqmp_nvmem_match,
	},
};

module_platform_driver(zynqmp_nvmem_driver);

MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>, Nava kishore Manne <navam@xilinx.com>");
MODULE_DESCRIPTION("ZynqMP NVMEM driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
4640fa18 NM	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Copyright (C) 2019 Xilinx, Inc.
	4	*/
	5
	6	#include <linux/module.h>
	7	#include <linux/nvmem-provider.h>
	8	#include <linux/of.h>
	9	#include <linux/platform_device.h>
	10	#include <linux/firmware/xlnx-zynqmp.h>
	11
	12	#define SILICON_REVISION_MASK 0xF
	13
	14	struct zynqmp_nvmem_data {
	15	struct device *dev;
	16	struct nvmem_device *nvmem;
	17	};
	18
	19	static int zynqmp_nvmem_read(void *context, unsigned int offset,
	20	void *val, size_t bytes)
	21	{
	22	int ret;
	23	int idcode, version;
	24	struct zynqmp_nvmem_data *priv = context;
	25
21cd93ba	26	ret = zynqmp_pm_get_chipid(&idcode, &version);
4640fa18 NM	27	if (ret < 0)
	28	return ret;
	29
	30	dev_dbg(priv->dev, "Read chipid val %x %x\n", idcode, version);
	31	(int )val = version & SILICON_REVISION_MASK;
	32
	33	return 0;
	34	}
	35
	36	static struct nvmem_config econfig = {
	37	.name = "zynqmp-nvmem",
	38	.owner = THIS_MODULE,
	39	.word_size = 1,
	40	.size = 1,
	41	.read_only = true,
	42	};
	43
	44	static const struct of_device_id zynqmp_nvmem_match[] = {
	45	{ .compatible = "xlnx,zynqmp-nvmem-fw", },
	46	{ /* sentinel */ },
	47	};
	48	MODULE_DEVICE_TABLE(of, zynqmp_nvmem_match);
	49
	50	static int zynqmp_nvmem_probe(struct platform_device *pdev)
	51	{
	52	struct device *dev = &pdev->dev;
	53	struct zynqmp_nvmem_data *priv;
	54
	55	priv = devm_kzalloc(dev, sizeof(struct zynqmp_nvmem_data), GFP_KERNEL);
	56	if (!priv)
	57	return -ENOMEM;
	58
	59	priv->dev = dev;
	60	econfig.dev = dev;
	61	econfig.reg_read = zynqmp_nvmem_read;
	62	econfig.priv = priv;
	63
	64	priv->nvmem = devm_nvmem_register(dev, &econfig);
	65
	66	return PTR_ERR_OR_ZERO(priv->nvmem);
	67	}
	68
	69	static struct platform_driver zynqmp_nvmem_driver = {
	70	.probe = zynqmp_nvmem_probe,
	71	.driver = {
	72	.name = "zynqmp-nvmem",
	73	.of_match_table = zynqmp_nvmem_match,
	74	},
	75	};
	76
	77	module_platform_driver(zynqmp_nvmem_driver);
	78
	79	MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>, Nava kishore Manne <navam@xilinx.com>");
	80	MODULE_DESCRIPTION("ZynqMP NVMEM driver");
	81	MODULE_LICENSE("GPL");