mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
01d0d2c42a
The nvmem core driver supports to read and write single byte. So, allow qfprom to support this feature. This change helps in extracting a required value based on bit-offset and number of bits for the required value in the nvmem cell. Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/*
|
|
* 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");
|