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