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