77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
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/*
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* Copyright (C) 2007 STMicroelectronics Limited
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* Author: Stuart Menefy <stuart.menefy@st.com>
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <mach/common.h>
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#define DRIVER_NAME "epld"
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static void __iomem *epld_base;
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static int epld_opsize;
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void epld_write(unsigned long value, unsigned long offset)
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{
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if (epld_opsize == 16)
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writew(value, epld_base + offset);
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else
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writeb(value, epld_base + offset);
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}
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unsigned long epld_read(unsigned long offset)
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{
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if (epld_opsize == 16)
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return readw(epld_base + offset);
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else
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return readb(epld_base + offset);
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}
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void __init epld_early_init(struct platform_device *pdev)
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{
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int size = pdev->resource[0].end - pdev->resource[0].start + 1;
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struct plat_epld_data *data = pdev->dev.platform_data;
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epld_base = ioremap(pdev->resource[0].start, size);
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if (!epld_base)
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panic("Unable to ioremap EPLD");
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if (data)
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epld_opsize = data->opsize;
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}
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static int __init epld_probe(struct platform_device *pdev)
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{
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int size = pdev->resource[0].end - pdev->resource[0].start + 1;
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if (!request_mem_region(pdev->resource[0].start, size, pdev->name))
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return -EBUSY;
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if (epld_base)
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return 0;
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epld_early_init(pdev);
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return 0;
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}
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static struct platform_driver epld_driver = {
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.probe = epld_probe,
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init epld_init(void)
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{
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return platform_driver_register(&epld_driver);
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}
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arch_initcall(epld_init);
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