Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: eb5396cf81bb1b725c79ec2360c890dca8214cac (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
/*
 * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that 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.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/blkdev.h>
#include <linux/bootmem.h>
#include <linux/pm.h>
#include <linux/smp.h>

#include <asm/bootinfo.h>
#include <asm/reboot.h>
#include <asm/sibyte/board.h>
#include <asm/smp-ops.h>

#include <asm/fw/cfe/cfe_api.h>
#include <asm/fw/cfe/cfe_error.h>

/* Max ram addressable in 32-bit segments */
#ifdef CONFIG_64BIT
#define MAX_RAM_SIZE (~0ULL)
#else
#ifdef CONFIG_HIGHMEM
#ifdef CONFIG_64BIT_PHYS_ADDR
#define MAX_RAM_SIZE (~0ULL)
#else
#define MAX_RAM_SIZE (0xffffffffULL)
#endif
#else
#define MAX_RAM_SIZE (0x1fffffffULL)
#endif
#endif

#define SIBYTE_MAX_MEM_REGIONS 8
phys_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
phys_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
unsigned int board_mem_region_count;

int cfe_cons_handle;

#ifdef CONFIG_BLK_DEV_INITRD
extern unsigned long initrd_start, initrd_end;
#endif

static void __noreturn cfe_linux_exit(void *arg)
{
	int warm = *(int *)arg;

	if (smp_processor_id()) {
		static int reboot_smp;

		/* Don't repeat the process from another CPU */
		if (!reboot_smp) {
			/* Get CPU 0 to do the cfe_exit */
			reboot_smp = 1;
			smp_call_function(cfe_linux_exit, arg, 0);
		}
	} else {
		printk("Passing control back to CFE...\n");
		cfe_exit(warm, 0);
		printk("cfe_exit returned??\n");
	}
	while (1);
}

static void __noreturn cfe_linux_restart(char *command)
{
	static const int zero;

	cfe_linux_exit((void *)&zero);
}

static void __noreturn cfe_linux_halt(void)
{
	static const int one = 1;

	cfe_linux_exit((void *)&one);
}

static __init void prom_meminit(void)
{
	u64 addr, size, type; /* regardless of 64BIT_PHYS_ADDR */
	int mem_flags = 0;
	unsigned int idx;
	int rd_flag;
#ifdef CONFIG_BLK_DEV_INITRD
	unsigned long initrd_pstart;
	unsigned long initrd_pend;

	initrd_pstart = CPHYSADDR(initrd_start);
	initrd_pend = CPHYSADDR(initrd_end);
	if (initrd_start &&
	    ((initrd_pstart > MAX_RAM_SIZE)
	     || (initrd_pend > MAX_RAM_SIZE))) {
		panic("initrd out of addressable memory");
	}

#endif /* INITRD */

	for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
	     idx++) {
		rd_flag = 0;
		if (type == CFE_MI_AVAILABLE) {
			/*
			 * See if this block contains (any portion of) the
			 * ramdisk
			 */
#ifdef CONFIG_BLK_DEV_INITRD
			if (initrd_start) {
				if ((initrd_pstart > addr) &&
				    (initrd_pstart < (addr + size))) {
					add_memory_region(addr,
					                  initrd_pstart - addr,
					                  BOOT_MEM_RAM);
					rd_flag = 1;
				}
				if ((initrd_pend > addr) &&
				    (initrd_pend < (addr + size))) {
					add_memory_region(initrd_pend,
						(addr + size) - initrd_pend,
						 BOOT_MEM_RAM);
					rd_flag = 1;
				}
			}
#endif
			if (!rd_flag) {
				if (addr > MAX_RAM_SIZE)
					continue;
				if (addr+size > MAX_RAM_SIZE)
					size = MAX_RAM_SIZE - (addr+size) + 1;
				/*
				 * memcpy/__copy_user prefetch, which
				 * will cause a bus error for
				 * KSEG/KUSEG addrs not backed by RAM.
				 * Hence, reserve some padding for the
				 * prefetch distance.
				 */
				if (size > 512)
					size -= 512;
				add_memory_region(addr, size, BOOT_MEM_RAM);
			}
			board_mem_region_addrs[board_mem_region_count] = addr;
			board_mem_region_sizes[board_mem_region_count] = size;
			board_mem_region_count++;
			if (board_mem_region_count ==
			    SIBYTE_MAX_MEM_REGIONS) {
				/*
				 * Too many regions.  Need to configure more
				 */
				while(1);
			}
		}
	}
#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start) {
		add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
				  BOOT_MEM_RESERVED);
	}
#endif
}

#ifdef CONFIG_BLK_DEV_INITRD
static int __init initrd_setup(char *str)
{
	char rdarg[64];
	int idx;
	char *tmp, *endptr;
	unsigned long initrd_size;

	/* Make a copy of the initrd argument so we can smash it up here */
	for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
		if (!str[idx] || (str[idx] == ' ')) break;
		rdarg[idx] = str[idx];
	}

	rdarg[idx] = 0;
	str = rdarg;

	/*
	 *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
	 *  e.g. initrd=3abfd@80010000.  This is set up by the loader.
	 */
	for (tmp = str; *tmp != '@'; tmp++) {
		if (!*tmp) {
			goto fail;
		}
	}
	*tmp = 0;
	tmp++;
	if (!*tmp) {
		goto fail;
	}
	initrd_size = simple_strtoul(str, &endptr, 16);
	if (*endptr) {
		*(tmp-1) = '@';
		goto fail;
	}
	*(tmp-1) = '@';
	initrd_start = simple_strtoul(tmp, &endptr, 16);
	if (*endptr) {
		goto fail;
	}
	initrd_end = initrd_start + initrd_size;
	printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
	return 1;
 fail:
	printk("Bad initrd argument.  Disabling initrd\n");
	initrd_start = 0;
	initrd_end = 0;
	return 1;
}

#endif

extern struct plat_smp_ops sb_smp_ops;
extern struct plat_smp_ops bcm1480_smp_ops;

/*
 * prom_init is called just after the cpu type is determined, from setup_arch()
 */
void __init prom_init(void)
{
	uint64_t cfe_ept, cfe_handle;
	unsigned int cfe_eptseal;
	int argc = fw_arg0;
	char **envp = (char **) fw_arg2;
	int *prom_vec = (int *) fw_arg3;

	_machine_restart   = cfe_linux_restart;
	_machine_halt      = cfe_linux_halt;
	pm_power_off = cfe_linux_halt;

	/*
	 * Check if a loader was used; if NOT, the 4 arguments are
	 * what CFE gives us (handle, 0, EPT and EPTSEAL)
	 */
	if (argc < 0) {
		cfe_handle = (uint64_t)(long)argc;
		cfe_ept = (long)envp;
		cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
	} else {
		if ((int32_t)(long)prom_vec < 0) {
			/*
			 * Old loader; all it gives us is the handle,
			 * so use the "known" entrypoint and assume
			 * the seal.
			 */
			cfe_handle = (uint64_t)(long)prom_vec;
			cfe_ept = (uint64_t)((int32_t)0x9fc00500);
			cfe_eptseal = CFE_EPTSEAL;
		} else {
			/*
			 * Newer loaders bundle the handle/ept/eptseal
			 * Note: prom_vec is in the loader's useg
			 * which is still alive in the TLB.
			 */
			cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
			cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
			cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
		}
	}
	if (cfe_eptseal != CFE_EPTSEAL) {
		/* too early for panic to do any good */
		printk("CFE's entrypoint seal doesn't match. Spinning.");
		while (1) ;
	}
	cfe_init(cfe_handle, cfe_ept);
	/*
	 * Get the handle for (at least) prom_putchar, possibly for
	 * boot console
	 */
	cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
	if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, CL_SIZE) < 0) {
		if (argc >= 0) {
			/* The loader should have set the command line */
			/* too early for panic to do any good */
			printk("LINUX_CMDLINE not defined in cfe.");
			while (1) ;
		}
	}

#ifdef CONFIG_BLK_DEV_INITRD
	{
		char *ptr;
		/* Need to find out early whether we've got an initrd.  So scan
		   the list looking now */
		for (ptr = arcs_cmdline; *ptr; ptr++) {
			while (*ptr == ' ') {
				ptr++;
			}
			if (!strncmp(ptr, "initrd=", 7)) {
				initrd_setup(ptr+7);
				break;
			} else {
				while (*ptr && (*ptr != ' ')) {
					ptr++;
				}
			}
		}
	}
#endif /* CONFIG_BLK_DEV_INITRD */

	/* Not sure this is needed, but it's the safe way. */
	arcs_cmdline[CL_SIZE-1] = 0;

	prom_meminit();

#if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
	register_smp_ops(&sb_smp_ops);
#endif
#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
	register_smp_ops(&bcm1480_smp_ops);
#endif
}

void __init prom_free_prom_memory(void)
{
	/* Not sure what I'm supposed to do here.  Nothing, I think */
}

void prom_putchar(char c)
{
	int ret;

	while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
		;
}