Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Kamel Bouhara | 389 | 100.00% | 1 | 100.00% |
Total | 389 | 1 |
// SPDX-License-Identifier: GPL-2.0-only /* * sfr.c - driver for special function registers * * Copyright (C) 2019 Bootlin. * */ #include <linux/mfd/syscon.h> #include <linux/module.h> #include <linux/nvmem-provider.h> #include <linux/random.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/regmap.h> #define SFR_SN0 0x4c #define SFR_SN_SIZE 8 struct atmel_sfr_priv { struct regmap *regmap; }; static int atmel_sfr_read(void *context, unsigned int offset, void *buf, size_t bytes) { struct atmel_sfr_priv *priv = context; return regmap_bulk_read(priv->regmap, SFR_SN0 + offset, buf, bytes / 4); } static struct nvmem_config atmel_sfr_nvmem_config = { .name = "atmel-sfr", .read_only = true, .word_size = 4, .stride = 4, .size = SFR_SN_SIZE, .reg_read = atmel_sfr_read, }; static int atmel_sfr_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct nvmem_device *nvmem; struct atmel_sfr_priv *priv; u8 sn[SFR_SN_SIZE]; int ret; priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->regmap = syscon_node_to_regmap(np); if (IS_ERR(priv->regmap)) { dev_err(dev, "cannot get parent's regmap\n"); return PTR_ERR(priv->regmap); } atmel_sfr_nvmem_config.dev = dev; atmel_sfr_nvmem_config.priv = priv; nvmem = devm_nvmem_register(dev, &atmel_sfr_nvmem_config); if (IS_ERR(nvmem)) { dev_err(dev, "error registering nvmem config\n"); return PTR_ERR(nvmem); } ret = atmel_sfr_read(priv, 0, sn, SFR_SN_SIZE); if (ret == 0) add_device_randomness(sn, SFR_SN_SIZE); return ret; } static const struct of_device_id atmel_sfr_dt_ids[] = { { .compatible = "atmel,sama5d2-sfr", }, { .compatible = "atmel,sama5d4-sfr", }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, atmel_sfr_dt_ids); static struct platform_driver atmel_sfr_driver = { .probe = atmel_sfr_probe, .driver = { .name = "atmel-sfr", .of_match_table = atmel_sfr_dt_ids, }, }; module_platform_driver(atmel_sfr_driver); MODULE_AUTHOR("Kamel Bouhara <kamel.bouhara@bootlin.com>"); MODULE_DESCRIPTION("Atmel SFR SN driver for SAMA5D2/4 SoC family"); MODULE_LICENSE("GPL v2");
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