aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/plat-omap/sram.c
blob: 19014b2ff4c6315a6e190c3c2c03e17c33eb184b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
/*
 * linux/arch/arm/plat-omap/sram.c
 *
 * OMAP SRAM detection and management
 *
 * Copyright (C) 2005 Nokia Corporation
 * Written by Tony Lindgren <tony@atomide.com>
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <asm/tlb.h>
#include <asm/io.h>
#include <asm/cacheflush.h>

#include <asm/mach/map.h>

#include <asm/arch/sram.h>
#include <asm/arch/board.h>

#define OMAP1_SRAM_PA		0x20000000
#define OMAP1_SRAM_VA		0xd0000000
#define OMAP2_SRAM_PA		0x40200000
#define OMAP2_SRAM_PUB_PA	0x4020f800
#define OMAP2_SRAM_VA		0xd0000000
#define OMAP2_SRAM_PUB_VA	0xd0000800

#if defined(CONFIG_ARCH_OMAP24XX)
#define SRAM_BOOTLOADER_SZ	0x00
#else
#define SRAM_BOOTLOADER_SZ	0x80
#endif

#define VA_REQINFOPERM0		IO_ADDRESS(0x68005048)
#define VA_READPERM0		IO_ADDRESS(0x68005050)
#define VA_WRITEPERM0		IO_ADDRESS(0x68005058)
#define VA_CONTROL_STAT		IO_ADDRESS(0x480002F8)
#define GP_DEVICE		0x300
#define TYPE_MASK		0x700

#define ROUND_DOWN(value,boundary)	((value) & (~((boundary)-1)))

static unsigned long omap_sram_base;
static unsigned long omap_sram_size;
static unsigned long omap_sram_ceil;

unsigned long omap_fb_sram_start;
unsigned long omap_fb_sram_size;

/* Depending on the target RAMFS firewall setup, the public usable amount of
 * SRAM varies.  The default accessable size for all device types is 2k. A GP
 * device allows ARM11 but not other initators for full size. This
 * functionality seems ok until some nice security API happens.
 */
static int is_sram_locked(void)
{
	int type = 0;

	if (cpu_is_omap242x())
		type = __raw_readl(VA_CONTROL_STAT) & TYPE_MASK;

	if (type == GP_DEVICE) {
		/* RAMFW: R/W access to all initators for all qualifier sets */
		if (cpu_is_omap242x()) {
			__raw_writel(0xFF, VA_REQINFOPERM0); /* all q-vects */
			__raw_writel(0xCFDE, VA_READPERM0);  /* all i-read */
			__raw_writel(0xCFDE, VA_WRITEPERM0); /* all i-write */
		}
		return 0;
	} else
		return 1; /* assume locked with no PPA or security driver */
}

void get_fb_sram_conf(unsigned long start_avail, unsigned size_avail,
		      unsigned long *start, unsigned long *size)
{
	const struct omap_fbmem_config *fbmem_conf;

	fbmem_conf = omap_get_config(OMAP_TAG_FBMEM, struct omap_fbmem_config);
	if (fbmem_conf != NULL) {
		*start = fbmem_conf->fb_sram_start;
		*size = fbmem_conf->fb_sram_size;
	} else {
		*size = 0;
		*start = 0;
	}

	if (*size && (
	    *start < start_avail ||
	    *start + *size > start_avail + size_avail)) {
		printk(KERN_ERR "invalid FB SRAM configuration\n");
		*start = start_avail;
		*size = size_avail;
	}

	if (*size)
		pr_info("Reserving %lu bytes SRAM for frame buffer\n", *size);
}

/*
 * The amount of SRAM depends on the core type.
 * Note that we cannot try to test for SRAM here because writes
 * to secure SRAM will hang the system. Also the SRAM is not
 * yet mapped at this point.
 */
void __init omap_detect_sram(void)
{
	unsigned long sram_start;

	if (cpu_is_omap24xx()) {
		if (is_sram_locked()) {
			omap_sram_base = OMAP2_SRAM_PUB_VA;
			sram_start = OMAP2_SRAM_PUB_PA;
			omap_sram_size = 0x800; /* 2K */
		} else {
			omap_sram_base = OMAP2_SRAM_VA;
			sram_start = OMAP2_SRAM_PA;
			if (cpu_is_omap242x())
				omap_sram_size = 0xa0000; /* 640K */
			else if (cpu_is_omap243x())
				omap_sram_size = 0x10000; /* 64K */
		}
	} else {
		omap_sram_base = OMAP1_SRAM_VA;
		sram_start = OMAP1_SRAM_PA;

		if (cpu_is_omap730())
			omap_sram_size = 0x32000;	/* 200K */
		else if (cpu_is_omap15xx())
			omap_sram_size = 0x30000;	/* 192K */
		else if (cpu_is_omap1610() || cpu_is_omap1621() ||
		     cpu_is_omap1710())
			omap_sram_size = 0x4000;	/* 16K */
		else if (cpu_is_omap1611())
			omap_sram_size = 0x3e800;	/* 250K */
		else {
			printk(KERN_ERR "Could not detect SRAM size\n");
			omap_sram_size = 0x4000;
		}
	}
	get_fb_sram_conf(sram_start + SRAM_BOOTLOADER_SZ,
			 omap_sram_size - SRAM_BOOTLOADER_SZ,
			 &omap_fb_sram_start, &omap_fb_sram_size);
	if (omap_fb_sram_size)
		omap_sram_size -= sram_start + omap_sram_size -
				  omap_fb_sram_start;
	omap_sram_ceil = omap_sram_base + omap_sram_size;
}

static struct map_desc omap_sram_io_desc[] __initdata = {
	{	/* .length gets filled in at runtime */
		.virtual	= OMAP1_SRAM_VA,
		.pfn		= __phys_to_pfn(OMAP1_SRAM_PA),
		.type		= MT_MEMORY
	}
};

/*
 * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
 */
void __init omap_map_sram(void)
{
	unsigned long base;

	if (omap_sram_size == 0)
		return;

	if (cpu_is_omap24xx()) {
		omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;

		base = OMAP2_SRAM_PA;
		base = ROUND_DOWN(base, PAGE_SIZE);
		omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
	}

	omap_sram_io_desc[0].length = 1024 * 1024;	/* Use section desc */
	iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));

	printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
	__pfn_to_phys(omap_sram_io_desc[0].pfn),
	omap_sram_io_desc[0].virtual,
	       omap_sram_io_desc[0].length);

	/*
	 * Normally devicemaps_init() would flush caches and tlb after
	 * mdesc->map_io(), but since we're called from map_io(), we
	 * must do it here.
	 */
	local_flush_tlb_all();
	flush_cache_all();

	/*
	 * Looks like we need to preserve some bootloader code at the
	 * beginning of SRAM for jumping to flash for reboot to work...
	 */
	memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
	       omap_sram_size - SRAM_BOOTLOADER_SZ);
}

void * omap_sram_push(void * start, unsigned long size)
{
	if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
		printk(KERN_ERR "Not enough space in SRAM\n");
		return NULL;
	}

	omap_sram_ceil -= size;
	omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
	memcpy((void *)omap_sram_ceil, start, size);

	return (void *)omap_sram_ceil;
}

static void omap_sram_error(void)
{
	panic("Uninitialized SRAM function\n");
}

#ifdef CONFIG_ARCH_OMAP1

static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);

void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
{
	if (!_omap_sram_reprogram_clock)
		omap_sram_error();

	return _omap_sram_reprogram_clock(dpllctl, ckctl);
}

int __init omap1_sram_init(void)
{
	_omap_sram_reprogram_clock = omap_sram_push(sram_reprogram_clock,
						    sram_reprogram_clock_sz);

	return 0;
}

#else
#define omap1_sram_init()	do {} while (0)
#endif

#ifdef CONFIG_ARCH_OMAP2

static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
			      u32 base_cs, u32 force_unlock);

void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
		   u32 base_cs, u32 force_unlock)
{
	if (!_omap2_sram_ddr_init)
		omap_sram_error();

	return _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
				    base_cs, force_unlock);
}

static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
					  u32 mem_type);

void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
{
	if (!_omap2_sram_reprogram_sdrc)
		omap_sram_error();

	return _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
}

static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);

u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
{
	if (!_omap2_set_prcm)
		omap_sram_error();

	return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
}

int __init omap2_sram_init(void)
{
	_omap2_sram_ddr_init = omap_sram_push(sram_ddr_init, sram_ddr_init_sz);

	_omap2_sram_reprogram_sdrc = omap_sram_push(sram_reprogram_sdrc,
						    sram_reprogram_sdrc_sz);
	_omap2_set_prcm = omap_sram_push(sram_set_prcm, sram_set_prcm_sz);

	return 0;
}
#else
#define omap2_sram_init()	do {} while (0)
#endif

int __init omap_sram_init(void)
{
	omap_detect_sram();
	omap_map_sram();

	if (!cpu_is_omap24xx())
		omap1_sram_init();
	else
		omap2_sram_init();

	return 0;
}