mirror of https://gitee.com/openkylin/linux.git
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* EBU - the external bus unit attaches PCI, NOR and NAND
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*
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* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
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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/ioport.h>
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#include <lantiq_soc.h>
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/* all access to the ebu must be locked */
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DEFINE_SPINLOCK(ebu_lock);
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EXPORT_SYMBOL_GPL(ebu_lock);
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static struct resource ltq_ebu_resource = {
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.name = "ebu",
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.start = LTQ_EBU_BASE_ADDR,
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.end = LTQ_EBU_BASE_ADDR + LTQ_EBU_SIZE - 1,
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.flags = IORESOURCE_MEM,
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};
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/* remapped base addr of the clock unit and external bus unit */
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void __iomem *ltq_ebu_membase;
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static int __init lantiq_ebu_init(void)
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{
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/* insert and request the memory region */
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if (insert_resource(&iomem_resource, <q_ebu_resource) < 0)
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panic("Failed to insert ebu memory");
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if (request_mem_region(ltq_ebu_resource.start,
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resource_size(<q_ebu_resource), "ebu") < 0)
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panic("Failed to request ebu memory");
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/* remap ebu register range */
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ltq_ebu_membase = ioremap_nocache(ltq_ebu_resource.start,
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resource_size(<q_ebu_resource));
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if (!ltq_ebu_membase)
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panic("Failed to remap ebu memory");
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/* make sure to unprotect the memory region where flash is located */
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ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_BUSCON0) & ~EBU_WRDIS, LTQ_EBU_BUSCON0);
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return 0;
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}
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postcore_initcall(lantiq_ebu_init);
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