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 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 84 static void __noreturn cfe_linux_restart(char *command) 85 { 86 static const int zero; 87 88 cfe_linux_exit((void *)&zero); 89 } 90 91 static void __noreturn cfe_linux_halt(void) 92 { 93 static const int one = 1; 94 95 cfe_linux_exit((void *)&one); 96 } 97 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 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 */ 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 } 333 334 void __init prom_free_prom_memory(void) 335 { 336 /* Not sure what I'm supposed to do here. Nothing, I think */ 337 } 338 339 void prom_putchar(char c) 340 { 341 int ret; 342 343 while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0) 344 ; 345 } 346