aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/powertv/memory.c
blob: 6e5f1bdc59b5fa77215803d8e919b55afe3c081d (plain)
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
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
/*
 * Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
 * Portions copyright (C) 2009 Cisco Systems, Inc.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Apparently originally from arch/mips/malta-memory.c. Modified to work
 * with the PowerTV bootloader.
 */
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/pfn.h>
#include <linux/string.h>

#include <asm/bootinfo.h>
#include <asm/page.h>
#include <asm/sections.h>

#include <asm/mips-boards/prom.h>
#include <asm/mach-powertv/asic.h>
#include <asm/mach-powertv/ioremap.h>

#include "init.h"

/* Memory constants */
#define KIBIBYTE(n)		((n) * 1024)	/* Number of kibibytes */
#define MEBIBYTE(n)		((n) * KIBIBYTE(1024)) /* Number of mebibytes */
#define DEFAULT_MEMSIZE		MEBIBYTE(128)	/* If no memsize provided */

#define BLDR_SIZE	KIBIBYTE(256)		/* Memory reserved for bldr */
#define RV_SIZE		MEBIBYTE(4)		/* Size of reset vector */

#define LOW_MEM_END	0x20000000		/* Highest low memory address */
#define BLDR_ALIAS	0x10000000		/* Bootloader address */
#define RV_PHYS		0x1fc00000		/* Reset vector address */
#define LOW_RAM_END	RV_PHYS			/* End of real RAM in low mem */

/*
 * Very low-level conversion from processor physical address to device
 * DMA address for the first bank of memory.
 */
#define PHYS_TO_DMA(paddr)	((paddr) + (CONFIG_LOW_RAM_DMA - LOW_RAM_ALIAS))

unsigned long ptv_memsize;

/*
 * struct low_mem_reserved - Items in low memory that are reserved
 * @start:	Physical address of item
 * @size:	Size, in bytes, of this item
 * @is_aliased: True if this is RAM aliased from another location. If false,
 *		it is something other than aliased RAM and the RAM in the
 *		unaliased address is still visible outside of low memory.
 */
struct low_mem_reserved {
	phys_addr_t	start;
	phys_addr_t	size;
	bool		is_aliased;
};

/*
 * Must be in ascending address order
 */
struct low_mem_reserved low_mem_reserved[] = {
	{BLDR_ALIAS, BLDR_SIZE, true},	/* Bootloader RAM */
	{RV_PHYS, RV_SIZE, false},	/* Reset vector */
};

/*
 * struct mem_layout - layout of a piece of the system RAM
 * @phys:	Physical address of the start of this piece of RAM. This is the
 *		address at which both the processor and I/O devices see the
 *		RAM.
 * @alias:	Alias of this piece of memory in order to make it appear in
 *		the low memory part of the processor's address space. I/O
 *		devices don't see anything here.
 * @size:	Size, in bytes, of this piece of RAM
 */
struct mem_layout {
	phys_addr_t	phys;
	phys_addr_t	alias;
	phys_addr_t	size;
};

/*
 * struct mem_layout_list - list descriptor for layouts of system RAM pieces
 * @family:	Specifies the family being described
 * @n:		Number of &struct mem_layout elements
 * @layout:	Pointer to the list of &mem_layout structures
 */
struct mem_layout_list {
	enum family_type	family;
	size_t			n;
	struct mem_layout	*layout;
};

static struct mem_layout f1500_layout[] = {
	{0x20000000, 0x10000000, MEBIBYTE(256)},
};

static struct mem_layout f4500_layout[] = {
	{0x40000000, 0x10000000, MEBIBYTE(256)},
	{0x20000000, 0x20000000, MEBIBYTE(32)},
};

static struct mem_layout f8500_layout[] = {
	{0x40000000, 0x10000000, MEBIBYTE(256)},
	{0x20000000, 0x20000000, MEBIBYTE(32)},
	{0x30000000, 0x30000000, MEBIBYTE(32)},
};

static struct mem_layout fx600_layout[] = {
	{0x20000000, 0x10000000, MEBIBYTE(256)},
	{0x60000000, 0x60000000, MEBIBYTE(128)},
};

static struct mem_layout_list layout_list[] = {
	{FAMILY_1500, ARRAY_SIZE(f1500_layout), f1500_layout},
	{FAMILY_1500VZE, ARRAY_SIZE(f1500_layout), f1500_layout},
	{FAMILY_1500VZF, ARRAY_SIZE(f1500_layout), f1500_layout},
	{FAMILY_4500, ARRAY_SIZE(f4500_layout), f4500_layout},
	{FAMILY_8500, ARRAY_SIZE(f8500_layout), f8500_layout},
	{FAMILY_8500RNG, ARRAY_SIZE(f8500_layout), f8500_layout},
	{FAMILY_4600, ARRAY_SIZE(fx600_layout), fx600_layout},
	{FAMILY_4600VZA, ARRAY_SIZE(fx600_layout), fx600_layout},
	{FAMILY_8600, ARRAY_SIZE(fx600_layout), fx600_layout},
	{FAMILY_8600VZB, ARRAY_SIZE(fx600_layout), fx600_layout},
};

/* If we can't determine the layout, use this */
static struct mem_layout default_layout[] = {
	{0x20000000, 0x10000000, MEBIBYTE(128)},
};

/**
 * register_non_ram - register low memory not available for RAM usage
 */
static __init void register_non_ram(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(low_mem_reserved); i++)
		add_memory_region(low_mem_reserved[i].start,
			low_mem_reserved[i].size, BOOT_MEM_RESERVED);
}

/**
 * get_memsize - get the size of memory as a single bank
 */
static phys_addr_t get_memsize(void)
{
	static char cmdline[COMMAND_LINE_SIZE] __initdata;
	phys_addr_t memsize = 0;
	char *memsize_str;
	char *ptr;

	/* Check the command line first for a memsize directive */
	strcpy(cmdline, arcs_cmdline);
	ptr = strstr(cmdline, "memsize=");
	if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
		ptr = strstr(ptr, " memsize=");

	if (ptr) {
		memsize = memparse(ptr + 8, &ptr);
	} else {
		/* otherwise look in the environment */
		memsize_str = prom_getenv("memsize");

		if (memsize_str != NULL) {
			pr_info("prom memsize = %s\n", memsize_str);
			memsize = simple_strtol(memsize_str, NULL, 0);
		}

		if (memsize == 0) {
			if (_prom_memsize != 0) {
				memsize = _prom_memsize;
				pr_info("_prom_memsize = 0x%x\n", memsize);
				/* add in memory that the bootloader doesn't
				 * report */
				memsize += BLDR_SIZE;
			} else {
				memsize = DEFAULT_MEMSIZE;
				pr_info("Memsize not passed by bootloader, "
					"defaulting to 0x%x\n", memsize);
			}
		}
	}

	return memsize;
}

/**
 * register_low_ram - register an aliased section of RAM
 * @p:		Alias address of memory
 * @n:		Number of bytes in this section of memory
 *
 * Returns the number of bytes registered
 *
 */
static __init phys_addr_t register_low_ram(phys_addr_t p, phys_addr_t n)
{
	phys_addr_t s;
	int i;
	phys_addr_t orig_n;

	orig_n = n;

	BUG_ON(p + n > RV_PHYS);

	for (i = 0; n != 0 && i < ARRAY_SIZE(low_mem_reserved); i++) {
		phys_addr_t start;
		phys_addr_t size;

		start = low_mem_reserved[i].start;
		size = low_mem_reserved[i].size;

		/* Handle memory before this low memory section */
		if (p < start) {
			phys_addr_t s;
			s = min(n, start - p);
			add_memory_region(p, s, BOOT_MEM_RAM);
			p += s;
			n -= s;
		}

		/* Handle the low memory section itself. If it's aliased,
		 * we reduce the number of byes left, but if not, the RAM
		 * is available elsewhere and we don't reduce the number of
		 * bytes remaining. */
		if (p == start) {
			if (low_mem_reserved[i].is_aliased) {
				s = min(n, size);
				n -= s;
				p += s;
			} else
				p += n;
		}
	}

	return orig_n - n;
}

/*
 * register_ram - register real RAM
 * @p:	Address of memory as seen by devices
 * @alias:	If the memory is seen at an additional address by the processor,
 *		this will be the address, otherwise it is the same as @p.
 * @n:		Number of bytes in this section of memory
 */
static __init void register_ram(phys_addr_t p, phys_addr_t alias,
	phys_addr_t n)
{
	/*
	 * If some or all of this memory has an alias, break it into the
	 * aliased and non-aliased portion.
	 */
	if (p != alias) {
		phys_addr_t alias_size;
		phys_addr_t registered;

		alias_size = min(n, LOW_RAM_END - alias);
		registered = register_low_ram(alias, alias_size);
		ioremap_add_map(alias, p, n);
		n -= registered;
		p += registered;
	}

#ifdef CONFIG_HIGHMEM
	if (n != 0) {
		add_memory_region(p, n, BOOT_MEM_RAM);
		ioremap_add_map(p, p, n);
	}
#endif
}

/**
 * register_address_space - register things in the address space
 * @memsize:	Number of bytes of RAM installed
 *
 * Takes the given number of bytes of RAM and registers as many of the regions,
 * or partial regions, as it can. So, the default configuration might have
 * two regions with 256 MiB each. If the memsize passed in on the command line
 * is 384 MiB, it will register the first region with 256 MiB and the second
 * with 128 MiB.
 */
static __init void register_address_space(phys_addr_t memsize)
{
	int i;
	phys_addr_t size;
	size_t n;
	struct mem_layout *layout;
	enum family_type family;

	/*
	 * Register all of the things that aren't available to the kernel as
	 * memory.
	 */
	register_non_ram();

	/* Find the appropriate memory description */
	family = platform_get_family();

	for (i = 0; i < ARRAY_SIZE(layout_list); i++) {
		if (layout_list[i].family == family)
			break;
	}

	if (i == ARRAY_SIZE(layout_list)) {
		n = ARRAY_SIZE(default_layout);
		layout = default_layout;
	} else {
		n = layout_list[i].n;
		layout = layout_list[i].layout;
	}

	for (i = 0; memsize != 0 && i < n; i++) {
		size = min(memsize, layout[i].size);
		register_ram(layout[i].phys, layout[i].alias, size);
		memsize -= size;
	}
}

void __init prom_meminit(void)
{
	ptv_memsize = get_memsize();
	register_address_space(ptv_memsize);
}

void __init prom_free_prom_memory(void)
{
	unsigned long addr;
	int i;

	for (i = 0; i < boot_mem_map.nr_map; i++) {
		if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
			continue;

		addr = boot_mem_map.map[i].addr;
		free_init_pages("prom memory",
				addr, addr + boot_mem_map.map[i].size);
	}
}