linux/arch/mips/lantiq/xway/ebu.c

54 lines
1.5 KiB
C

/*
* This program 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.
*
* EBU - the external bus unit attaches PCI, NOR and NAND
*
* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/ioport.h>
#include <lantiq_soc.h>
/* all access to the ebu must be locked */
DEFINE_SPINLOCK(ebu_lock);
EXPORT_SYMBOL_GPL(ebu_lock);
static struct resource ltq_ebu_resource = {
.name = "ebu",
.start = LTQ_EBU_BASE_ADDR,
.end = LTQ_EBU_BASE_ADDR + LTQ_EBU_SIZE - 1,
.flags = IORESOURCE_MEM,
};
/* remapped base addr of the clock unit and external bus unit */
void __iomem *ltq_ebu_membase;
static int __init lantiq_ebu_init(void)
{
/* insert and request the memory region */
if (insert_resource(&iomem_resource, &ltq_ebu_resource) < 0)
panic("Failed to insert ebu memory\n");
if (request_mem_region(ltq_ebu_resource.start,
resource_size(&ltq_ebu_resource), "ebu") < 0)
panic("Failed to request ebu memory\n");
/* remap ebu register range */
ltq_ebu_membase = ioremap_nocache(ltq_ebu_resource.start,
resource_size(&ltq_ebu_resource));
if (!ltq_ebu_membase)
panic("Failed to remap ebu memory\n");
/* make sure to unprotect the memory region where flash is located */
ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_BUSCON0) & ~EBU_WRDIS, LTQ_EBU_BUSCON0);
return 0;
}
postcore_initcall(lantiq_ebu_init);