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/*
* st_spi_fsm.c - ST Fast Sequence Mode (FSM) Serial Flash Controller
*
* Author: Angus Clark <angus.clark@st.com>
*
* Copyright (C) 2010-2014 STicroelectronics Limited
*
* JEDEC probe based on drivers/mtd/devices/m25p80.c
*
* This code is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/of.h>
struct stfsm {
struct device *dev;
void __iomem *base;
struct resource *region;
struct mtd_info mtd;
struct mutex lock;
};
static int stfsm_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct resource *res;
struct stfsm *fsm;
if (!np) {
dev_err(&pdev->dev, "No DT found\n");
return -EINVAL;
}
fsm = devm_kzalloc(&pdev->dev, sizeof(*fsm), GFP_KERNEL);
if (!fsm)
return -ENOMEM;
fsm->dev = &pdev->dev;
platform_set_drvdata(pdev, fsm);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "Resource not found\n");
return -ENODEV;
}
fsm->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(fsm->base)) {
dev_err(&pdev->dev,
"Failed to reserve memory region %pR\n", res);
return PTR_ERR(fsm->base);
}
mutex_init(&fsm->lock);
fsm->mtd.dev.parent = &pdev->dev;
fsm->mtd.type = MTD_NORFLASH;
fsm->mtd.writesize = 4;
fsm->mtd.writebufsize = fsm->mtd.writesize;
fsm->mtd.flags = MTD_CAP_NORFLASH;
return mtd_device_parse_register(&fsm->mtd, NULL, NULL, NULL, 0);
}
static int stfsm_remove(struct platform_device *pdev)
{
struct stfsm *fsm = platform_get_drvdata(pdev);
int err;
err = mtd_device_unregister(&fsm->mtd);
if (err)
return err;
return 0;
}
static struct of_device_id stfsm_match[] = {
{ .compatible = "st,spi-fsm", },
{},
};
MODULE_DEVICE_TABLE(of, stfsm_match);
static struct platform_driver stfsm_driver = {
.probe = stfsm_probe,
.remove = stfsm_remove,
.driver = {
.name = "st-spi-fsm",
.owner = THIS_MODULE,
.of_match_table = stfsm_match,
},
};
module_platform_driver(stfsm_driver);
MODULE_AUTHOR("Angus Clark <angus.clark@st.com>");
MODULE_DESCRIPTION("ST SPI FSM driver");
MODULE_LICENSE("GPL");
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