Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * UniPhier eFuse driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2017 Socionext Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mod_devicetable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/nvmem-provider.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) struct uniphier_efuse_priv {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static int uniphier_reg_read(void *context,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 			     unsigned int reg, void *_val, size_t bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	struct uniphier_efuse_priv *priv = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	u8 *val = _val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	int offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	for (offs = 0; offs < bytes; offs += sizeof(u8))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		*val++ = readb(priv->base + reg + offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static int uniphier_efuse_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	struct nvmem_device *nvmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	struct nvmem_config econfig = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	struct uniphier_efuse_priv *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	priv->base = devm_ioremap_resource(dev, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	if (IS_ERR(priv->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		return PTR_ERR(priv->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	econfig.stride = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	econfig.word_size = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	econfig.read_only = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	econfig.reg_read = uniphier_reg_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	econfig.size = resource_size(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	econfig.priv = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	econfig.dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	nvmem = devm_nvmem_register(dev, &econfig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	return PTR_ERR_OR_ZERO(nvmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static const struct of_device_id uniphier_efuse_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	{ .compatible = "socionext,uniphier-efuse",},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	{/* sentinel */},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static struct platform_driver uniphier_efuse_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	.probe = uniphier_efuse_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 		.name = "uniphier-efuse",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		.of_match_table = uniphier_efuse_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) module_platform_driver(uniphier_efuse_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) MODULE_DESCRIPTION("UniPhier eFuse driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) MODULE_LICENSE("GPL v2");