1/*
2 * OMAP SRAM detection and management
3 *
4 * Copyright (C) 2005 Nokia Corporation
5 * Written by Tony Lindgren <tony@atomide.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/io.h>
16
17#include <asm/fncpy.h>
18#include <asm/tlb.h>
19#include <asm/cacheflush.h>
20
21#include <asm/mach/map.h>
22
23#include "soc.h"
24#include "sram.h"
25
26#define OMAP1_SRAM_PA		0x20000000
27#define SRAM_BOOTLOADER_SZ	0x80
28
29/*
30 * The amount of SRAM depends on the core type.
31 * Note that we cannot try to test for SRAM here because writes
32 * to secure SRAM will hang the system. Also the SRAM is not
33 * yet mapped at this point.
34 */
35static void __init omap_detect_and_map_sram(void)
36{
37	unsigned long omap_sram_skip = SRAM_BOOTLOADER_SZ;
38	unsigned long omap_sram_start = OMAP1_SRAM_PA;
39	unsigned long omap_sram_size;
40
41	if (cpu_is_omap7xx())
42		omap_sram_size = 0x32000;	/* 200K */
43	else if (cpu_is_omap15xx())
44		omap_sram_size = 0x30000;	/* 192K */
45	else if (cpu_is_omap1610() || cpu_is_omap1611() ||
46			cpu_is_omap1621() || cpu_is_omap1710())
47		omap_sram_size = 0x4000;	/* 16K */
48	else {
49		pr_err("Could not detect SRAM size\n");
50		omap_sram_size = 0x4000;
51	}
52
53	omap_map_sram(omap_sram_start, omap_sram_size,
54		omap_sram_skip, 1);
55}
56
57static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
58
59void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
60{
61	BUG_ON(!_omap_sram_reprogram_clock);
62	/* On 730, bit 13 must always be 1 */
63	if (cpu_is_omap7xx())
64		ckctl |= 0x2000;
65	_omap_sram_reprogram_clock(dpllctl, ckctl);
66}
67
68int __init omap_sram_init(void)
69{
70	omap_detect_and_map_sram();
71	_omap_sram_reprogram_clock =
72			omap_sram_push(omap1_sram_reprogram_clock,
73					omap1_sram_reprogram_clock_sz);
74
75	return 0;
76}
77