1 /*
2 * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/linkage.h>
22 #include <linux/mm.h>
23 #include <linux/blkdev.h>
24 #include <linux/bootmem.h>
25 #include <linux/pm.h>
26 #include <linux/smp.h>
27
28 #include <asm/bootinfo.h>
29 #include <asm/reboot.h>
30 #include <asm/setup.h>
31 #include <asm/sibyte/board.h>
32 #include <asm/smp-ops.h>
33
34 #include <asm/fw/cfe/cfe_api.h>
35 #include <asm/fw/cfe/cfe_error.h>
36
37 /* Max ram addressable in 32-bit segments */
38 #ifdef CONFIG_64BIT
39 #define MAX_RAM_SIZE (~0ULL)
40 #else
41 #ifdef CONFIG_HIGHMEM
42 #ifdef CONFIG_PHYS_ADDR_T_64BIT
43 #define MAX_RAM_SIZE (~0ULL)
44 #else
45 #define MAX_RAM_SIZE (0xffffffffULL)
46 #endif
47 #else
48 #define MAX_RAM_SIZE (0x1fffffffULL)
49 #endif
50 #endif
51
52 #define SIBYTE_MAX_MEM_REGIONS 8
53 phys_addr_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
54 phys_addr_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
55 unsigned int board_mem_region_count;
56
57 int cfe_cons_handle;
58
59 #ifdef CONFIG_BLK_DEV_INITRD
60 extern unsigned long initrd_start, initrd_end;
61 #endif
62
cfe_linux_exit(void * arg)63 static void __noreturn cfe_linux_exit(void *arg)
64 {
65 int warm = *(int *)arg;
66
67 if (smp_processor_id()) {
68 static int reboot_smp;
69
70 /* Don't repeat the process from another CPU */
71 if (!reboot_smp) {
72 /* Get CPU 0 to do the cfe_exit */
73 reboot_smp = 1;
74 smp_call_function(cfe_linux_exit, arg, 0);
75 }
76 } else {
77 printk("Passing control back to CFE...\n");
78 cfe_exit(warm, 0);
79 printk("cfe_exit returned??\n");
80 }
81 while (1);
82 }
83
cfe_linux_restart(char * command)84 static void __noreturn cfe_linux_restart(char *command)
85 {
86 static const int zero;
87
88 cfe_linux_exit((void *)&zero);
89 }
90
cfe_linux_halt(void)91 static void __noreturn cfe_linux_halt(void)
92 {
93 static const int one = 1;
94
95 cfe_linux_exit((void *)&one);
96 }
97
prom_meminit(void)98 static __init void prom_meminit(void)
99 {
100 u64 addr, size, type; /* regardless of PHYS_ADDR_T_64BIT */
101 int mem_flags = 0;
102 unsigned int idx;
103 int rd_flag;
104 #ifdef CONFIG_BLK_DEV_INITRD
105 unsigned long initrd_pstart;
106 unsigned long initrd_pend;
107
108 initrd_pstart = CPHYSADDR(initrd_start);
109 initrd_pend = CPHYSADDR(initrd_end);
110 if (initrd_start &&
111 ((initrd_pstart > MAX_RAM_SIZE)
112 || (initrd_pend > MAX_RAM_SIZE))) {
113 panic("initrd out of addressable memory");
114 }
115
116 #endif /* INITRD */
117
118 for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
119 idx++) {
120 rd_flag = 0;
121 if (type == CFE_MI_AVAILABLE) {
122 /*
123 * See if this block contains (any portion of) the
124 * ramdisk
125 */
126 #ifdef CONFIG_BLK_DEV_INITRD
127 if (initrd_start) {
128 if ((initrd_pstart > addr) &&
129 (initrd_pstart < (addr + size))) {
130 add_memory_region(addr,
131 initrd_pstart - addr,
132 BOOT_MEM_RAM);
133 rd_flag = 1;
134 }
135 if ((initrd_pend > addr) &&
136 (initrd_pend < (addr + size))) {
137 add_memory_region(initrd_pend,
138 (addr + size) - initrd_pend,
139 BOOT_MEM_RAM);
140 rd_flag = 1;
141 }
142 }
143 #endif
144 if (!rd_flag) {
145 if (addr > MAX_RAM_SIZE)
146 continue;
147 if (addr+size > MAX_RAM_SIZE)
148 size = MAX_RAM_SIZE - (addr+size) + 1;
149 /*
150 * memcpy/__copy_user prefetch, which
151 * will cause a bus error for
152 * KSEG/KUSEG addrs not backed by RAM.
153 * Hence, reserve some padding for the
154 * prefetch distance.
155 */
156 if (size > 512)
157 size -= 512;
158 add_memory_region(addr, size, BOOT_MEM_RAM);
159 }
160 board_mem_region_addrs[board_mem_region_count] = addr;
161 board_mem_region_sizes[board_mem_region_count] = size;
162 board_mem_region_count++;
163 if (board_mem_region_count ==
164 SIBYTE_MAX_MEM_REGIONS) {
165 /*
166 * Too many regions. Need to configure more
167 */
168 while(1);
169 }
170 }
171 }
172 #ifdef CONFIG_BLK_DEV_INITRD
173 if (initrd_start) {
174 add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
175 BOOT_MEM_RESERVED);
176 }
177 #endif
178 }
179
180 #ifdef CONFIG_BLK_DEV_INITRD
initrd_setup(char * str)181 static int __init initrd_setup(char *str)
182 {
183 char rdarg[64];
184 int idx;
185 char *tmp, *endptr;
186 unsigned long initrd_size;
187
188 /* Make a copy of the initrd argument so we can smash it up here */
189 for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
190 if (!str[idx] || (str[idx] == ' ')) break;
191 rdarg[idx] = str[idx];
192 }
193
194 rdarg[idx] = 0;
195 str = rdarg;
196
197 /*
198 *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
199 * e.g. initrd=3abfd@80010000. This is set up by the loader.
200 */
201 for (tmp = str; *tmp != '@'; tmp++) {
202 if (!*tmp) {
203 goto fail;
204 }
205 }
206 *tmp = 0;
207 tmp++;
208 if (!*tmp) {
209 goto fail;
210 }
211 initrd_size = simple_strtoul(str, &endptr, 16);
212 if (*endptr) {
213 *(tmp-1) = '@';
214 goto fail;
215 }
216 *(tmp-1) = '@';
217 initrd_start = simple_strtoul(tmp, &endptr, 16);
218 if (*endptr) {
219 goto fail;
220 }
221 initrd_end = initrd_start + initrd_size;
222 printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
223 return 1;
224 fail:
225 printk("Bad initrd argument. Disabling initrd\n");
226 initrd_start = 0;
227 initrd_end = 0;
228 return 1;
229 }
230
231 #endif
232
233 extern const struct plat_smp_ops sb_smp_ops;
234 extern const struct plat_smp_ops bcm1480_smp_ops;
235
236 /*
237 * prom_init is called just after the cpu type is determined, from setup_arch()
238 */
prom_init(void)239 void __init prom_init(void)
240 {
241 uint64_t cfe_ept, cfe_handle;
242 unsigned int cfe_eptseal;
243 int argc = fw_arg0;
244 char **envp = (char **) fw_arg2;
245 int *prom_vec = (int *) fw_arg3;
246
247 _machine_restart = cfe_linux_restart;
248 _machine_halt = cfe_linux_halt;
249 pm_power_off = cfe_linux_halt;
250
251 /*
252 * Check if a loader was used; if NOT, the 4 arguments are
253 * what CFE gives us (handle, 0, EPT and EPTSEAL)
254 */
255 if (argc < 0) {
256 cfe_handle = (uint64_t)(long)argc;
257 cfe_ept = (long)envp;
258 cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
259 } else {
260 if ((int32_t)(long)prom_vec < 0) {
261 /*
262 * Old loader; all it gives us is the handle,
263 * so use the "known" entrypoint and assume
264 * the seal.
265 */
266 cfe_handle = (uint64_t)(long)prom_vec;
267 cfe_ept = (uint64_t)((int32_t)0x9fc00500);
268 cfe_eptseal = CFE_EPTSEAL;
269 } else {
270 /*
271 * Newer loaders bundle the handle/ept/eptseal
272 * Note: prom_vec is in the loader's useg
273 * which is still alive in the TLB.
274 */
275 cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
276 cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
277 cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
278 }
279 }
280 if (cfe_eptseal != CFE_EPTSEAL) {
281 /* too early for panic to do any good */
282 printk("CFE's entrypoint seal doesn't match. Spinning.");
283 while (1) ;
284 }
285 cfe_init(cfe_handle, cfe_ept);
286 /*
287 * Get the handle for (at least) prom_putchar, possibly for
288 * boot console
289 */
290 cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
291 if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, COMMAND_LINE_SIZE) < 0) {
292 if (argc >= 0) {
293 /* The loader should have set the command line */
294 /* too early for panic to do any good */
295 printk("LINUX_CMDLINE not defined in cfe.");
296 while (1) ;
297 }
298 }
299
300 #ifdef CONFIG_BLK_DEV_INITRD
301 {
302 char *ptr;
303 /* Need to find out early whether we've got an initrd. So scan
304 the list looking now */
305 for (ptr = arcs_cmdline; *ptr; ptr++) {
306 while (*ptr == ' ') {
307 ptr++;
308 }
309 if (!strncmp(ptr, "initrd=", 7)) {
310 initrd_setup(ptr+7);
311 break;
312 } else {
313 while (*ptr && (*ptr != ' ')) {
314 ptr++;
315 }
316 }
317 }
318 }
319 #endif /* CONFIG_BLK_DEV_INITRD */
320
321 /* Not sure this is needed, but it's the safe way. */
322 arcs_cmdline[COMMAND_LINE_SIZE-1] = 0;
323
324 prom_meminit();
325
326 #if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
327 register_smp_ops(&sb_smp_ops);
328 #endif
329 #if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
330 register_smp_ops(&bcm1480_smp_ops);
331 #endif
332 }
333
prom_free_prom_memory(void)334 void __init prom_free_prom_memory(void)
335 {
336 /* Not sure what I'm supposed to do here. Nothing, I think */
337 }
338
prom_putchar(char c)339 void prom_putchar(char c)
340 {
341 int ret;
342
343 while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
344 ;
345 }
346
