Eric Lee / smarc-fsl-linux-kernel

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drivers/nvmem/qfprom.c 2.46 KB
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81f7e3824   Eric Lee   Initial Release, ... 
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  /*
   * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 and
   * only version 2 as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   */
  
  #include <linux/device.h>
  #include <linux/module.h>
  #include <linux/io.h>
  #include <linux/nvmem-provider.h>
  #include <linux/platform_device.h>
  
  static int qfprom_reg_read(void *context,
  			unsigned int reg, void *_val, size_t bytes)
  {
  	void __iomem *base = context;
  	u8 *val = _val;
  	int i = 0, words = bytes;
  
  	while (words--)
  		*val++ = readb(base + reg + i++);
  
  	return 0;
  }
  
  static int qfprom_reg_write(void *context,
  			 unsigned int reg, void *_val, size_t bytes)
  {
  	void __iomem *base = context;
  	u8 *val = _val;
  	int i = 0, words = bytes;
  
  	while (words--)
  		writeb(*val++, base + reg + i++);
  
  	return 0;
  }
  
  static int qfprom_remove(struct platform_device *pdev)
  {
  	struct nvmem_device *nvmem = platform_get_drvdata(pdev);
  
  	return nvmem_unregister(nvmem);
  }
  
  static struct nvmem_config econfig = {
  	.name = "qfprom",
  	.owner = THIS_MODULE,
  	.stride = 1,
  	.word_size = 1,
  	.reg_read = qfprom_reg_read,
  	.reg_write = qfprom_reg_write,
  };
  
  static int qfprom_probe(struct platform_device *pdev)
  {
  	struct device *dev = &pdev->dev;
  	struct resource *res;
  	struct nvmem_device *nvmem;
  	void __iomem *base;
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	base = devm_ioremap_resource(dev, res);
  	if (IS_ERR(base))
  		return PTR_ERR(base);
  
  	econfig.size = resource_size(res);
  	econfig.dev = dev;
  	econfig.priv = base;
  
  	nvmem = nvmem_register(&econfig);
  	if (IS_ERR(nvmem))
  		return PTR_ERR(nvmem);
  
  	platform_set_drvdata(pdev, nvmem);
  
  	return 0;
  }
  
  static const struct of_device_id qfprom_of_match[] = {
  	{ .compatible = "qcom,qfprom",},
  	{/* sentinel */},
  };
  MODULE_DEVICE_TABLE(of, qfprom_of_match);
  
  static struct platform_driver qfprom_driver = {
  	.probe = qfprom_probe,
  	.remove = qfprom_remove,
  	.driver = {
  		.name = "qcom,qfprom",
  		.of_match_table = qfprom_of_match,
  	},
  };
  module_platform_driver(qfprom_driver);
  MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
  MODULE_DESCRIPTION("Qualcomm QFPROM driver");
  MODULE_LICENSE("GPL v2");