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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 #include <asm/setup.h>
 23 
 24 /* special SNI prom calls */
 25 /*
 26  * This does not exist in all proms - SINIX compares
 27  * the prom env variable "version" against "2.0008"
 28  * or greater. If lesser it tries to probe interesting
 29  * registers
 30  */
 31 #define PROM_GET_MEMCONF        58
 32 #define PROM_GET_HWCONF         61
 33 
 34 #define PROM_VEC                (u64 *)CKSEG1ADDR(0x1fc00000)
 35 #define PROM_ENTRY(x)           (PROM_VEC + (x))
 36 
 37 #define ___prom_putchar         ((int *(*)(int))PROM_ENTRY(PROM_PUTCHAR))
 38 #define ___prom_getenv          ((char *(*)(char *))PROM_ENTRY(PROM_GETENV))
 39 #define ___prom_get_memconf     ((void (*)(void *))PROM_ENTRY(PROM_GET_MEMCONF))
 40 #define ___prom_get_hwconf      ((u32 (*)(void))PROM_ENTRY(PROM_GET_HWCONF))
 41 
 42 #ifdef CONFIG_64BIT
 43 
 44 /* O32 stack has to be 8-byte aligned. */
 45 static u64 o32_stk[4096];
 46 #define O32_STK   &o32_stk[sizeof(o32_stk)]
 47 
 48 #define __PROM_O32(fun, arg) fun arg __asm__(#fun); \
 49                                      __asm__(#fun " = call_o32")
 50 
 51 int   __PROM_O32(__prom_putchar, (int *(*)(int), void *, int));
 52 char *__PROM_O32(__prom_getenv, (char *(*)(char *), void *, char *));
 53 void  __PROM_O32(__prom_get_memconf, (void (*)(void *), void *, void *));
 54 u32   __PROM_O32(__prom_get_hwconf, (u32 (*)(void), void *));
 55 
 56 #define _prom_putchar(x)     __prom_putchar(___prom_putchar, O32_STK, x)
 57 #define _prom_getenv(x)      __prom_getenv(___prom_getenv, O32_STK, x)
 58 #define _prom_get_memconf(x) __prom_get_memconf(___prom_get_memconf, O32_STK, x)
 59 #define _prom_get_hwconf()   __prom_get_hwconf(___prom_get_hwconf, O32_STK)
 60 
 61 #else
 62 #define _prom_putchar(x)     ___prom_putchar(x)
 63 #define _prom_getenv(x)      ___prom_getenv(x)
 64 #define _prom_get_memconf(x) ___prom_get_memconf(x)
 65 #define _prom_get_hwconf(x)  ___prom_get_hwconf(x)
 66 #endif
 67 
 68 void prom_putchar(char c)
 69 {
 70         _prom_putchar(c);
 71 }
 72 
 73 
 74 char *prom_getenv(char *s)
 75 {
 76         return _prom_getenv(s);
 77 }
 78 
 79 void *prom_get_hwconf(void)
 80 {
 81         u32 hwconf = _prom_get_hwconf();
 82 
 83         if (hwconf == 0xffffffff)
 84                 return NULL;
 85 
 86         return (void *)CKSEG1ADDR(hwconf);
 87 }
 88 
 89 void __init prom_free_prom_memory(void)
 90 {
 91 }
 92 
 93 /*
 94  * /proc/cpuinfo system type
 95  *
 96  */
 97 char *system_type = "Unknown";
 98 const char *get_system_type(void)
 99 {
100         return system_type;
101 }
102 
103 static void __init sni_mem_init(void)
104 {
105         int i, memsize;
106         struct membank {
107                 u32             size;
108                 u32             base;
109                 u32             size2;
110                 u32             pad1;
111                 u32             pad2;
112         } memconf[8];
113         int brd_type = *(unsigned char *)SNI_IDPROM_BRDTYPE;
114 
115 
116         /* MemSIZE from prom in 16MByte chunks */
117         memsize = *((unsigned char *) SNI_IDPROM_MEMSIZE) * 16;
118 
119         pr_debug("IDProm memsize: %u MByte\n", memsize);
120 
121         /* get memory bank layout from prom */
122         _prom_get_memconf(&memconf);
123 
124         pr_debug("prom_get_mem_conf memory configuration:\n");
125         for (i = 0; i < 8 && memconf[i].size; i++) {
126                 if (brd_type == SNI_BRD_PCI_TOWER ||
127                     brd_type == SNI_BRD_PCI_TOWER_CPLUS) {
128                         if (memconf[i].base >= 0x20000000 &&
129                             memconf[i].base <  0x30000000)
130                                 memconf[i].base -= 0x20000000;
131                 }
132                 pr_debug("Bank%d: %08x @ %08x\n", i,
133                         memconf[i].size, memconf[i].base);
134                 add_memory_region(memconf[i].base, memconf[i].size,
135                                   BOOT_MEM_RAM);
136         }
137 }
138 
139 void __init prom_init(void)
140 {
141         int argc = fw_arg0;
142         u32 *argv = (u32 *)CKSEG0ADDR(fw_arg1);
143         int i;
144 
145         sni_mem_init();
146 
147         /* copy prom cmdline parameters to kernel cmdline */
148         for (i = 1; i < argc; i++) {
149                 strcat(arcs_cmdline, (char *)CKSEG0ADDR(argv[i]));
150                 if (i < (argc - 1))
151                         strcat(arcs_cmdline, " ");
152         }
153 }
154 

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