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Linux/arch/mips/fw/sni/sniprom.c

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  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 }
153 

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