arch/mips/fw/sni/sniprom.c

   1 /*
   2  * Big Endian PROM code for SNI RM machines
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2005-2006 Florian Lohoff (flo@rfc822.org)
   9  * Copyright (C) 2005-2006 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/string.h>
  15 #include <linux/console.h>
  16
  17 #include <asm/addrspace.h>
  18 #include <asm/sni.h>
  19 #include <asm/mipsprom.h>
  20 #include <asm/mipsregs.h>
  21 #include <asm/bootinfo.h>
  22
  23 /* special SNI prom calls */
  24 /*
  25  * This does not exist in all proms - SINIX compares
  26  * the prom env variable "version" against "2.0008"
  27  * or greater. If lesser it tries to probe interesting
  28  * registers
  29  */
  30 #define PROM_GET_MEMCONF        58
  31 #define PROM_GET_HWCONF         61
  32
  33 #define PROM_VEC                (u64 *)CKSEG1ADDR(0x1fc00000)
  34 #define PROM_ENTRY(x)           (PROM_VEC + (x))
  35
  36 #define ___prom_putchar         ((int *(*)(int))PROM_ENTRY(PROM_PUTCHAR))
  37 #define ___prom_getenv          ((char *(*)(char *))PROM_ENTRY(PROM_GETENV))
  38 #define ___prom_get_memconf     ((void (*)(void *))PROM_ENTRY(PROM_GET_MEMCONF))
  39 #define ___prom_get_hwconf      ((u32 (*)(void))PROM_ENTRY(PROM_GET_HWCONF))
  40
  41 #ifdef CONFIG_64BIT
  42
  43 /* O32 stack has to be 8-byte aligned. */
  44 static u64 o32_stk[4096];
  45 #define O32_STK   &o32_stk[sizeof(o32_stk)]
  46
  47 #define __PROM_O32(fun, arg) fun arg __asm__(#fun); \
  48                                      __asm__(#fun " = call_o32")
  49
  50 int   __PROM_O32(__prom_putchar, (int *(*)(int), void *, int));
  51 char *__PROM_O32(__prom_getenv, (char *(*)(char *), void *, char *));
  52 void  __PROM_O32(__prom_get_memconf, (void (*)(void *), void *, void *));
  53 u32   __PROM_O32(__prom_get_hwconf, (u32 (*)(void), void *));
  54
  55 #define _prom_putchar(x)     __prom_putchar(___prom_putchar, O32_STK, x)
  56 #define _prom_getenv(x)      __prom_getenv(___prom_getenv, O32_STK, x)
  57 #define _prom_get_memconf(x) __prom_get_memconf(___prom_get_memconf, O32_STK, x)
  58 #define _prom_get_hwconf()   __prom_get_hwconf(___prom_get_hwconf, O32_STK)
  59
  60 #else
  61 #define _prom_putchar(x)     ___prom_putchar(x)
  62 #define _prom_getenv(x)      ___prom_getenv(x)
  63 #define _prom_get_memconf(x) ___prom_get_memconf(x)
  64 #define _prom_get_hwconf(x)  ___prom_get_hwconf(x)
  65 #endif
  66
  67 void prom_putchar(char c)
  68 {
  69         _prom_putchar(c);
  70 }
  71
  72
  73 char *prom_getenv(char *s)
  74 {
  75         return _prom_getenv(s);
  76 }
  77
  78 void *prom_get_hwconf(void)
  79 {
  80         u32 hwconf = _prom_get_hwconf();
  81
  82         if (hwconf == 0xffffffff)
  83                 return NULL;
  84
  85         return (void *)CKSEG1ADDR(hwconf);
  86 }
  87
  88 void __init prom_free_prom_memory(void)
  89 {
  90 }
  91
  92 /*
  93  * /proc/cpuinfo system type
  94  *
  95  */
  96 char *system_type = "Unknown";
  97 const char *get_system_type(void)
  98 {
  99         return system_type;
 100 }
 101
 102 static void __init sni_mem_init(void)
 103 {
 104         int i, memsize;
 105         struct membank {
 106                 u32             size;
 107                 u32             base;
 108                 u32             size2;
 109                 u32             pad1;
 110                 u32             pad2;
 111         } memconf[8];
 112         int brd_type = *(unsigned char *)SNI_IDPROM_BRDTYPE;
 113
 114
 115         /* MemSIZE from prom in 16MByte chunks */
 116         memsize = *((unsigned char *) SNI_IDPROM_MEMSIZE) * 16;
 117
 118         pr_debug("IDProm memsize: %u MByte\n", memsize);
 119
 120         /* get memory bank layout from prom */
 121         _prom_get_memconf(&memconf);
 122
 123         pr_debug("prom_get_mem_conf memory configuration:\n");
 124         for (i = 0; i < 8 && memconf[i].size; i++) {
 125                 if (brd_type == SNI_BRD_PCI_TOWER ||
 126                     brd_type == SNI_BRD_PCI_TOWER_CPLUS) {
 127                         if (memconf[i].base >= 0x20000000 &&
 128                             memconf[i].base <  0x30000000)
 129                                 memconf[i].base -= 0x20000000;
 130                 }
 131                 pr_debug("Bank%d: %08x @ %08x\n", i,
 132                         memconf[i].size, memconf[i].base);
 133                 add_memory_region(memconf[i].base, memconf[i].size,
 134                                   BOOT_MEM_RAM);
 135         }
 136 }
 137
 138 void __init prom_init(void)
 139 {
 140         int argc = fw_arg0;
 141         u32 *argv = (u32 *)CKSEG0ADDR(fw_arg1);
 142         int i;
 143
 144         sni_mem_init();
 145
 146         /* copy prom cmdline parameters to kernel cmdline */
 147         for (i = 1; i < argc; i++) {
 148                 strcat(arcs_cmdline, (char *)CKSEG0ADDR(argv[i]));
 149                 if (i < (argc - 1))
 150                         strcat(arcs_cmdline, " ");
 151         }
 152 }