1 /*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License version 2 as published
4 * by the Free Software Foundation.
5 *
6 * EBU - the external bus unit attaches PCI, NOR and NAND
7 *
8 * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/ioport.h>
14
15 #include <lantiq_soc.h>
16
17 /* all access to the ebu must be locked */
18 DEFINE_SPINLOCK(ebu_lock);
19 EXPORT_SYMBOL_GPL(ebu_lock);
20
21 static struct resource ltq_ebu_resource = {
22 .name = "ebu",
23 .start = LTQ_EBU_BASE_ADDR,
24 .end = LTQ_EBU_BASE_ADDR + LTQ_EBU_SIZE - 1,
25 .flags = IORESOURCE_MEM,
26 };
27
28 /* remapped base addr of the clock unit and external bus unit */
29 void __iomem *ltq_ebu_membase;
30
lantiq_ebu_init(void)31 static int __init lantiq_ebu_init(void)
32 {
33 /* insert and request the memory region */
34 if (insert_resource(&iomem_resource, <q_ebu_resource) < 0)
35 panic("Failed to insert ebu memory");
36
37 if (request_mem_region(ltq_ebu_resource.start,
38 resource_size(<q_ebu_resource), "ebu") < 0)
39 panic("Failed to request ebu memory");
40
41 /* remap ebu register range */
42 ltq_ebu_membase = ioremap_nocache(ltq_ebu_resource.start,
43 resource_size(<q_ebu_resource));
44 if (!ltq_ebu_membase)
45 panic("Failed to remap ebu memory");
46
47 /* make sure to unprotect the memory region where flash is located */
48 ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_BUSCON0) & ~EBU_WRDIS, LTQ_EBU_BUSCON0);
49 return 0;
50 }
51
52 postcore_initcall(lantiq_ebu_init);
53