1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * OMAP SRAM detection and management
 4 *
 5 * Copyright (C) 2005 Nokia Corporation
 6 * Written by Tony Lindgren <tony@atomide.com>
 7 */
 8
 9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/io.h>
13
14#include <asm/fncpy.h>
15#include <asm/tlb.h>
16#include <asm/cacheflush.h>
17
18#include <asm/mach/map.h>
19
20#include "soc.h"
21#include "sram.h"
22
23#define OMAP1_SRAM_PA		0x20000000
24#define SRAM_BOOTLOADER_SZ	0x80
25
26/*
27 * The amount of SRAM depends on the core type.
28 * Note that we cannot try to test for SRAM here because writes
29 * to secure SRAM will hang the system. Also the SRAM is not
30 * yet mapped at this point.
31 */
32static void __init omap_detect_and_map_sram(void)
33{
34	unsigned long omap_sram_skip = SRAM_BOOTLOADER_SZ;
35	unsigned long omap_sram_start = OMAP1_SRAM_PA;
36	unsigned long omap_sram_size;
37
38	if (cpu_is_omap7xx())
39		omap_sram_size = 0x32000;	/* 200K */
40	else if (cpu_is_omap15xx())
41		omap_sram_size = 0x30000;	/* 192K */
42	else if (cpu_is_omap1610() || cpu_is_omap1611() ||
43			cpu_is_omap1621() || cpu_is_omap1710())
44		omap_sram_size = 0x4000;	/* 16K */
45	else {
46		pr_err("Could not detect SRAM size\n");
47		omap_sram_size = 0x4000;
48	}
49
50	omap_map_sram(omap_sram_start, omap_sram_size,
51		omap_sram_skip, 1);
52}
53
54static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
55
56void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
57{
58	BUG_ON(!_omap_sram_reprogram_clock);
59	/* On 730, bit 13 must always be 1 */
60	if (cpu_is_omap7xx())
61		ckctl |= 0x2000;
62	_omap_sram_reprogram_clock(dpllctl, ckctl);
63}
64
65int __init omap_sram_init(void)
66{
67	omap_detect_and_map_sram();
68	_omap_sram_reprogram_clock =
69			omap_sram_push(omap1_sram_reprogram_clock,
70					omap1_sram_reprogram_clock_sz);
71
72	return 0;
73}