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f858a997ee
commit8d9eb0d6d5upstream. qfprom has different address spaces for read and write. Reads are always done from corrected address space, where as writes are done on raw address space. Writing to corrected address space is invalid and ignored, so it does not make sense to have this support in the driver which only supports corrected address space regions at the moment. Fixes:4ab11996b4("nvmem: qfprom: Add Qualcomm QFPROM support.") Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200522113341.7728-1-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
/*
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* Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/io.h>
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#include <linux/nvmem-provider.h>
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#include <linux/platform_device.h>
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struct qfprom_priv {
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void __iomem *base;
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};
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static int qfprom_reg_read(void *context,
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unsigned int reg, void *_val, size_t bytes)
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{
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struct qfprom_priv *priv = context;
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u8 *val = _val;
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int i = 0, words = bytes;
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while (words--)
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*val++ = readb(priv->base + reg + i++);
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return 0;
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}
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static struct nvmem_config econfig = {
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.name = "qfprom",
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.stride = 1,
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.word_size = 1,
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.reg_read = qfprom_reg_read,
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};
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static int qfprom_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct nvmem_device *nvmem;
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struct qfprom_priv *priv;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(priv->base))
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return PTR_ERR(priv->base);
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econfig.size = resource_size(res);
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econfig.dev = dev;
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econfig.priv = priv;
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nvmem = devm_nvmem_register(dev, &econfig);
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return PTR_ERR_OR_ZERO(nvmem);
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}
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static const struct of_device_id qfprom_of_match[] = {
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{ .compatible = "qcom,qfprom",},
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, qfprom_of_match);
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static struct platform_driver qfprom_driver = {
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.probe = qfprom_probe,
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.driver = {
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.name = "qcom,qfprom",
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.of_match_table = qfprom_of_match,
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},
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};
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module_platform_driver(qfprom_driver);
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MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
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MODULE_DESCRIPTION("Qualcomm QFPROM driver");
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MODULE_LICENSE("GPL v2");
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