1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org> 4 */ 5 6 #include <linux/device.h> 7 #include <linux/module.h> 8 #include <linux/mod_devicetable.h> 9 #include <linux/io.h> 10 #include <linux/nvmem-provider.h> 11 #include <linux/platform_device.h> 12 13 struct qfprom_priv { 14 void __iomem *base; 15 }; 16 17 static int qfprom_reg_read(void *context, 18 unsigned int reg, void *_val, size_t bytes) 19 { 20 struct qfprom_priv *priv = context; 21 u8 *val = _val; 22 int i = 0, words = bytes; 23 24 while (words--) 25 *val++ = readb(priv->base + reg + i++); 26 27 return 0; 28 } 29 30 static struct nvmem_config econfig = { 31 .name = "qfprom", 32 .stride = 1, 33 .word_size = 1, 34 .reg_read = qfprom_reg_read, 35 }; 36 37 static int qfprom_probe(struct platform_device *pdev) 38 { 39 struct device *dev = &pdev->dev; 40 struct resource *res; 41 struct nvmem_device *nvmem; 42 struct qfprom_priv *priv; 43 44 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 45 if (!priv) 46 return -ENOMEM; 47 48 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 49 priv->base = devm_ioremap_resource(dev, res); 50 if (IS_ERR(priv->base)) 51 return PTR_ERR(priv->base); 52 53 econfig.size = resource_size(res); 54 econfig.dev = dev; 55 econfig.priv = priv; 56 57 nvmem = devm_nvmem_register(dev, &econfig); 58 59 return PTR_ERR_OR_ZERO(nvmem); 60 } 61 62 static const struct of_device_id qfprom_of_match[] = { 63 { .compatible = "qcom,qfprom",}, 64 {/* sentinel */}, 65 }; 66 MODULE_DEVICE_TABLE(of, qfprom_of_match); 67 68 static struct platform_driver qfprom_driver = { 69 .probe = qfprom_probe, 70 .driver = { 71 .name = "qcom,qfprom", 72 .of_match_table = qfprom_of_match, 73 }, 74 }; 75 module_platform_driver(qfprom_driver); 76 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>"); 77 MODULE_DESCRIPTION("Qualcomm QFPROM driver"); 78 MODULE_LICENSE("GPL v2"); 79