144 lines
3.0 KiB
C
144 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* i.MX IIM driver
|
|
*
|
|
* Copyright (c) 2017 Pengutronix, Michael Grzeschik <m.grzeschik@pengutronix.de>
|
|
*
|
|
* Based on the barebox iim driver,
|
|
* Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>,
|
|
* Orex Computed Radiography
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/nvmem-provider.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/clk.h>
|
|
|
|
#define IIM_BANK_BASE(n) (0x800 + 0x400 * (n))
|
|
|
|
struct imx_iim_drvdata {
|
|
unsigned int nregs;
|
|
};
|
|
|
|
struct iim_priv {
|
|
void __iomem *base;
|
|
struct clk *clk;
|
|
};
|
|
|
|
static int imx_iim_read(void *context, unsigned int offset,
|
|
void *buf, size_t bytes)
|
|
{
|
|
struct iim_priv *iim = context;
|
|
int i, ret;
|
|
u8 *buf8 = buf;
|
|
|
|
ret = clk_prepare_enable(iim->clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = offset; i < offset + bytes; i++) {
|
|
int bank = i >> 5;
|
|
int reg = i & 0x1f;
|
|
|
|
*buf8++ = readl(iim->base + IIM_BANK_BASE(bank) + reg * 4);
|
|
}
|
|
|
|
clk_disable_unprepare(iim->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct imx_iim_drvdata imx27_drvdata = {
|
|
.nregs = 2 * 32,
|
|
};
|
|
|
|
static struct imx_iim_drvdata imx25_imx31_imx35_drvdata = {
|
|
.nregs = 3 * 32,
|
|
};
|
|
|
|
static struct imx_iim_drvdata imx51_drvdata = {
|
|
.nregs = 4 * 32,
|
|
};
|
|
|
|
static struct imx_iim_drvdata imx53_drvdata = {
|
|
.nregs = 4 * 32 + 16,
|
|
};
|
|
|
|
static const struct of_device_id imx_iim_dt_ids[] = {
|
|
{
|
|
.compatible = "fsl,imx25-iim",
|
|
.data = &imx25_imx31_imx35_drvdata,
|
|
}, {
|
|
.compatible = "fsl,imx27-iim",
|
|
.data = &imx27_drvdata,
|
|
}, {
|
|
.compatible = "fsl,imx31-iim",
|
|
.data = &imx25_imx31_imx35_drvdata,
|
|
}, {
|
|
.compatible = "fsl,imx35-iim",
|
|
.data = &imx25_imx31_imx35_drvdata,
|
|
}, {
|
|
.compatible = "fsl,imx51-iim",
|
|
.data = &imx51_drvdata,
|
|
}, {
|
|
.compatible = "fsl,imx53-iim",
|
|
.data = &imx53_drvdata,
|
|
}, {
|
|
/* sentinel */
|
|
},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, imx_iim_dt_ids);
|
|
|
|
static int imx_iim_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct iim_priv *iim;
|
|
struct nvmem_device *nvmem;
|
|
struct nvmem_config cfg = {};
|
|
const struct imx_iim_drvdata *drvdata = NULL;
|
|
|
|
iim = devm_kzalloc(dev, sizeof(*iim), GFP_KERNEL);
|
|
if (!iim)
|
|
return -ENOMEM;
|
|
|
|
iim->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(iim->base))
|
|
return PTR_ERR(iim->base);
|
|
|
|
drvdata = of_device_get_match_data(&pdev->dev);
|
|
|
|
iim->clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(iim->clk))
|
|
return PTR_ERR(iim->clk);
|
|
|
|
cfg.name = "imx-iim",
|
|
cfg.read_only = true,
|
|
cfg.word_size = 1,
|
|
cfg.stride = 1,
|
|
cfg.reg_read = imx_iim_read,
|
|
cfg.dev = dev;
|
|
cfg.size = drvdata->nregs;
|
|
cfg.priv = iim;
|
|
|
|
nvmem = devm_nvmem_register(dev, &cfg);
|
|
|
|
return PTR_ERR_OR_ZERO(nvmem);
|
|
}
|
|
|
|
static struct platform_driver imx_iim_driver = {
|
|
.probe = imx_iim_probe,
|
|
.driver = {
|
|
.name = "imx-iim",
|
|
.of_match_table = imx_iim_dt_ids,
|
|
},
|
|
};
|
|
module_platform_driver(imx_iim_driver);
|
|
|
|
MODULE_AUTHOR("Michael Grzeschik <m.grzeschik@pengutronix.de>");
|
|
MODULE_DESCRIPTION("i.MX IIM driver");
|
|
MODULE_LICENSE("GPL v2");
|