arch/mips/sibyte/common/cfe.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
   4  */
   5
   6 #include <linux/init.h>
   7 #include <linux/kernel.h>
   8 #include <linux/linkage.h>
   9 #include <linux/mm.h>
  10 #include <linux/blkdev.h>
  11 #include <linux/memblock.h>
  12 #include <linux/pm.h>
  13 #include <linux/smp.h>
  14
  15 #include <asm/bootinfo.h>
  16 #include <asm/reboot.h>
  17 #include <asm/setup.h>
  18 #include <asm/sibyte/board.h>
  19 #include <asm/smp-ops.h>
  20
  21 #include <asm/fw/cfe/cfe_api.h>
  22 #include <asm/fw/cfe/cfe_error.h>
  23
  24 /* Max ram addressable in 32-bit segments */
  25 #ifdef CONFIG_64BIT
  26 #define MAX_RAM_SIZE (~0ULL)
  27 #else
  28 #ifdef CONFIG_HIGHMEM
  29 #ifdef CONFIG_PHYS_ADDR_T_64BIT
  30 #define MAX_RAM_SIZE (~0ULL)
  31 #else
  32 #define MAX_RAM_SIZE (0xffffffffULL)
  33 #endif
  34 #else
  35 #define MAX_RAM_SIZE (0x1fffffffULL)
  36 #endif
  37 #endif
  38
  39 #define SIBYTE_MAX_MEM_REGIONS 8
  40 phys_addr_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
  41 phys_addr_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
  42 unsigned int board_mem_region_count;
  43
  44 int cfe_cons_handle;
  45
  46 #ifdef CONFIG_BLK_DEV_INITRD
  47 extern unsigned long initrd_start, initrd_end;
  48 #endif
  49
  50 static void __noreturn cfe_linux_exit(void *arg)
  51 {
  52         int warm = *(int *)arg;
  53
  54         if (smp_processor_id()) {
  55                 static int reboot_smp;
  56
  57                 /* Don't repeat the process from another CPU */
  58                 if (!reboot_smp) {
  59                         /* Get CPU 0 to do the cfe_exit */
  60                         reboot_smp = 1;
  61                         smp_call_function(cfe_linux_exit, arg, 0);
  62                 }
  63         } else {
  64                 printk("Passing control back to CFE...\n");
  65                 cfe_exit(warm, 0);
  66                 printk("cfe_exit returned??\n");
  67         }
  68         while (1);
  69 }
  70
  71 static void __noreturn cfe_linux_restart(char *command)
  72 {
  73         static const int zero;
  74
  75         cfe_linux_exit((void *)&zero);
  76 }
  77
  78 static void __noreturn cfe_linux_halt(void)
  79 {
  80         static const int one = 1;
  81
  82         cfe_linux_exit((void *)&one);
  83 }
  84
  85 static __init void prom_meminit(void)
  86 {
  87         u64 addr, size, type; /* regardless of PHYS_ADDR_T_64BIT */
  88         int mem_flags = 0;
  89         unsigned int idx;
  90         int rd_flag;
  91 #ifdef CONFIG_BLK_DEV_INITRD
  92         unsigned long initrd_pstart;
  93         unsigned long initrd_pend;
  94
  95         initrd_pstart = CPHYSADDR(initrd_start);
  96         initrd_pend = CPHYSADDR(initrd_end);
  97         if (initrd_start &&
  98             ((initrd_pstart > MAX_RAM_SIZE)
  99              || (initrd_pend > MAX_RAM_SIZE))) {
 100                 panic("initrd out of addressable memory");
 101         }
 102
 103 #endif /* INITRD */
 104
 105         for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
 106              idx++) {
 107                 rd_flag = 0;
 108                 if (type == CFE_MI_AVAILABLE) {
 109                         /*
 110                          * See if this block contains (any portion of) the
 111                          * ramdisk
 112                          */
 113 #ifdef CONFIG_BLK_DEV_INITRD
 114                         if (initrd_start) {
 115                                 if ((initrd_pstart > addr) &&
 116                                     (initrd_pstart < (addr + size))) {
 117                                         memblock_add(addr,
 118                                                      initrd_pstart - addr);
 119                                         rd_flag = 1;
 120                                 }
 121                                 if ((initrd_pend > addr) &&
 122                                     (initrd_pend < (addr + size))) {
 123                                         memblock_add(initrd_pend,
 124                                                 (addr + size) - initrd_pend);
 125                                         rd_flag = 1;
 126                                 }
 127                         }
 128 #endif
 129                         if (!rd_flag) {
 130                                 if (addr > MAX_RAM_SIZE)
 131                                         continue;
 132                                 if (addr+size > MAX_RAM_SIZE)
 133                                         size = MAX_RAM_SIZE - (addr+size) + 1;
 134                                 /*
 135                                  * memcpy/__copy_user prefetch, which
 136                                  * will cause a bus error for
 137                                  * KSEG/KUSEG addrs not backed by RAM.
 138                                  * Hence, reserve some padding for the
 139                                  * prefetch distance.
 140                                  */
 141                                 if (size > 512)
 142                                         size -= 512;
 143                                 memblock_add(addr, size);
 144                         }
 145                         board_mem_region_addrs[board_mem_region_count] = addr;
 146                         board_mem_region_sizes[board_mem_region_count] = size;
 147                         board_mem_region_count++;
 148                         if (board_mem_region_count ==
 149                             SIBYTE_MAX_MEM_REGIONS) {
 150                                 /*
 151                                  * Too many regions.  Need to configure more
 152                                  */
 153                                 while(1);
 154                         }
 155                 }
 156         }
 157 #ifdef CONFIG_BLK_DEV_INITRD
 158         if (initrd_start) {
 159                 memblock_add(initrd_pstart, initrd_pend - initrd_pstart);
 160                 memblock_reserve(initrd_pstart, initrd_pend - initrd_pstart);
 161         }
 162 #endif
 163 }
 164
 165 #ifdef CONFIG_BLK_DEV_INITRD
 166 static int __init initrd_setup(char *str)
 167 {
 168         char rdarg[64];
 169         int idx;
 170         char *tmp, *endptr;
 171         unsigned long initrd_size;
 172
 173         /* Make a copy of the initrd argument so we can smash it up here */
 174         for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
 175                 if (!str[idx] || (str[idx] == ' ')) break;
 176                 rdarg[idx] = str[idx];
 177         }
 178
 179         rdarg[idx] = 0;
 180         str = rdarg;
 181
 182         /*
 183          *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
 184          *  e.g. initrd=3abfd@80010000.  This is set up by the loader.
 185          */
 186         for (tmp = str; *tmp != '@'; tmp++) {
 187                 if (!*tmp) {
 188                         goto fail;
 189                 }
 190         }
 191         *tmp = 0;
 192         tmp++;
 193         if (!*tmp) {
 194                 goto fail;
 195         }
 196         initrd_size = simple_strtoul(str, &endptr, 16);
 197         if (*endptr) {
 198                 *(tmp-1) = '@';
 199                 goto fail;
 200         }
 201         *(tmp-1) = '@';
 202         initrd_start = simple_strtoul(tmp, &endptr, 16);
 203         if (*endptr) {
 204                 goto fail;
 205         }
 206         initrd_end = initrd_start + initrd_size;
 207         printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
 208         return 1;
 209  fail:
 210         printk("Bad initrd argument.  Disabling initrd\n");
 211         initrd_start = 0;
 212         initrd_end = 0;
 213         return 1;
 214 }
 215
 216 #endif
 217
 218 extern const struct plat_smp_ops sb_smp_ops;
 219 extern const struct plat_smp_ops bcm1480_smp_ops;
 220
 221 /*
 222  * prom_init is called just after the cpu type is determined, from setup_arch()
 223  */
 224 void __init prom_init(void)
 225 {
 226         uint64_t cfe_ept, cfe_handle;
 227         unsigned int cfe_eptseal;
 228         int argc = fw_arg0;
 229         char **envp = (char **) fw_arg2;
 230         int *prom_vec = (int *) fw_arg3;
 231
 232         _machine_restart   = cfe_linux_restart;
 233         _machine_halt      = cfe_linux_halt;
 234         pm_power_off = cfe_linux_halt;
 235
 236         /*
 237          * Check if a loader was used; if NOT, the 4 arguments are
 238          * what CFE gives us (handle, 0, EPT and EPTSEAL)
 239          */
 240         if (argc < 0) {
 241                 cfe_handle = (uint64_t)(long)argc;
 242                 cfe_ept = (long)envp;
 243                 cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
 244         } else {
 245                 if ((int32_t)(long)prom_vec < 0) {
 246                         /*
 247                          * Old loader; all it gives us is the handle,
 248                          * so use the "known" entrypoint and assume
 249                          * the seal.
 250                          */
 251                         cfe_handle = (uint64_t)(long)prom_vec;
 252                         cfe_ept = (uint64_t)((int32_t)0x9fc00500);
 253                         cfe_eptseal = CFE_EPTSEAL;
 254                 } else {
 255                         /*
 256                          * Newer loaders bundle the handle/ept/eptseal
 257                          * Note: prom_vec is in the loader's useg
 258                          * which is still alive in the TLB.
 259                          */
 260                         cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
 261                         cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
 262                         cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
 263                 }
 264         }
 265         if (cfe_eptseal != CFE_EPTSEAL) {
 266                 /* too early for panic to do any good */
 267                 printk("CFE's entrypoint seal doesn't match. Spinning.");
 268                 while (1) ;
 269         }
 270         cfe_init(cfe_handle, cfe_ept);
 271         /*
 272          * Get the handle for (at least) prom_putchar, possibly for
 273          * boot console
 274          */
 275         cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
 276         if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, COMMAND_LINE_SIZE) < 0) {
 277                 if (argc >= 0) {
 278                         /* The loader should have set the command line */
 279                         /* too early for panic to do any good */
 280                         printk("LINUX_CMDLINE not defined in cfe.");
 281                         while (1) ;
 282                 }
 283         }
 284
 285 #ifdef CONFIG_BLK_DEV_INITRD
 286         {
 287                 char *ptr;
 288                 /* Need to find out early whether we've got an initrd.  So scan
 289                    the list looking now */
 290                 for (ptr = arcs_cmdline; *ptr; ptr++) {
 291                         while (*ptr == ' ') {
 292                                 ptr++;
 293                         }
 294                         if (!strncmp(ptr, "initrd=", 7)) {
 295                                 initrd_setup(ptr+7);
 296                                 break;
 297                         } else {
 298                                 while (*ptr && (*ptr != ' ')) {
 299                                         ptr++;
 300                                 }
 301                         }
 302                 }
 303         }
 304 #endif /* CONFIG_BLK_DEV_INITRD */
 305
 306         /* Not sure this is needed, but it's the safe way. */
 307         arcs_cmdline[COMMAND_LINE_SIZE-1] = 0;
 308
 309         prom_meminit();
 310
 311 #if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
 312         register_smp_ops(&sb_smp_ops);
 313 #endif
 314 #if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
 315         register_smp_ops(&bcm1480_smp_ops);
 316 #endif
 317 }
 318
 319 void prom_putchar(char c)
 320 {
 321         int ret;
 322
 323         while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
 324                 ;
 325 }