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Linux/arch/mips/sibyte/common/cfe.c

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

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