mirror of
https://github.com/edk2-porting/linux-next.git
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107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
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/*
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* st_spi_fsm.c - ST Fast Sequence Mode (FSM) Serial Flash Controller
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*
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* Author: Angus Clark <angus.clark@st.com>
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*
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* Copyright (C) 2010-2014 STicroelectronics Limited
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*
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* JEDEC probe based on drivers/mtd/devices/m25p80.c
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*
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* This code 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 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/mtd.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/of.h>
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struct stfsm {
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struct device *dev;
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void __iomem *base;
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struct resource *region;
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struct mtd_info mtd;
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struct mutex lock;
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};
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static int stfsm_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct resource *res;
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struct stfsm *fsm;
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if (!np) {
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dev_err(&pdev->dev, "No DT found\n");
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return -EINVAL;
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}
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fsm = devm_kzalloc(&pdev->dev, sizeof(*fsm), GFP_KERNEL);
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if (!fsm)
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return -ENOMEM;
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fsm->dev = &pdev->dev;
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platform_set_drvdata(pdev, fsm);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "Resource not found\n");
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return -ENODEV;
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}
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fsm->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(fsm->base)) {
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dev_err(&pdev->dev,
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"Failed to reserve memory region %pR\n", res);
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return PTR_ERR(fsm->base);
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}
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mutex_init(&fsm->lock);
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fsm->mtd.dev.parent = &pdev->dev;
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fsm->mtd.type = MTD_NORFLASH;
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fsm->mtd.writesize = 4;
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fsm->mtd.writebufsize = fsm->mtd.writesize;
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fsm->mtd.flags = MTD_CAP_NORFLASH;
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return mtd_device_parse_register(&fsm->mtd, NULL, NULL, NULL, 0);
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}
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static int stfsm_remove(struct platform_device *pdev)
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{
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struct stfsm *fsm = platform_get_drvdata(pdev);
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int err;
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err = mtd_device_unregister(&fsm->mtd);
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if (err)
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return err;
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return 0;
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}
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static struct of_device_id stfsm_match[] = {
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{ .compatible = "st,spi-fsm", },
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{},
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};
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MODULE_DEVICE_TABLE(of, stfsm_match);
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static struct platform_driver stfsm_driver = {
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.probe = stfsm_probe,
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.remove = stfsm_remove,
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.driver = {
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.name = "st-spi-fsm",
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.owner = THIS_MODULE,
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.of_match_table = stfsm_match,
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},
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};
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module_platform_driver(stfsm_driver);
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MODULE_AUTHOR("Angus Clark <angus.clark@st.com>");
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MODULE_DESCRIPTION("ST SPI FSM driver");
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MODULE_LICENSE("GPL");
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