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/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. */
  44static 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
  50int   __PROM_O32(__prom_putchar, (int *(*)(int), void *, int));
  51char *__PROM_O32(__prom_getenv, (char *(*)(char *), void *, char *));
  52void  __PROM_O32(__prom_get_memconf, (void (*)(void *), void *, void *));
  53u32   __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
  67void prom_putchar(char c)
  68{
  69        _prom_putchar(c);
  70}
  71
  72
  73char *prom_getenv(char *s)
  74{
  75        return _prom_getenv(s);
  76}
  77
  78void *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
  88void __init prom_free_prom_memory(void)
  89{
  90}
  91
  92/*
  93 * /proc/cpuinfo system type
  94 *
  95 */
  96char *system_type = "Unknown";
  97const char *get_system_type(void)
  98{
  99        return system_type;
 100}
 101
 102static 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
 138void __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}
 153