Linux Kernel  3.7.1
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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 ([email protected])
9  * Copyright (C) 2005-2006 Thomas Bogendoerfer ([email protected])
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 static u8 o32_stk[16384];
44 #define O32_STK &o32_stk[sizeof(o32_stk)]
45 
46 #define __PROM_O32(fun, arg) fun arg __asm__(#fun); \
47  __asm__(#fun " = call_o32")
48 
49 int __PROM_O32(__prom_putchar, (int *(*)(int), void *, int));
50 char *__PROM_O32(__prom_getenv, (char *(*)(char *), void *, char *));
51 void __PROM_O32(__prom_get_memconf, (void (*)(void *), void *, void *));
52 u32 __PROM_O32(__prom_get_hwconf, (u32 (*)(void), void *));
53 
54 #define _prom_putchar(x) __prom_putchar(___prom_putchar, O32_STK, x)
55 #define _prom_getenv(x) __prom_getenv(___prom_getenv, O32_STK, x)
56 #define _prom_get_memconf(x) __prom_get_memconf(___prom_get_memconf, O32_STK, x)
57 #define _prom_get_hwconf() __prom_get_hwconf(___prom_get_hwconf, O32_STK)
58 
59 #else
60 #define _prom_putchar(x) ___prom_putchar(x)
61 #define _prom_getenv(x) ___prom_getenv(x)
62 #define _prom_get_memconf(x) ___prom_get_memconf(x)
63 #define _prom_get_hwconf(x) ___prom_get_hwconf(x)
64 #endif
65 
66 void prom_putchar(char c)
67 {
68  _prom_putchar(c);
69 }
70 
71 
72 char *prom_getenv(char *s)
73 {
74  return _prom_getenv(s);
75 }
76 
77 void *prom_get_hwconf(void)
78 {
79  u32 hwconf = _prom_get_hwconf();
80 
81  if (hwconf == 0xffffffff)
82  return NULL;
83 
84  return (void *)CKSEG1ADDR(hwconf);
85 }
86 
88 {
89 }
90 
91 /*
92  * /proc/cpuinfo system type
93  *
94  */
95 char *system_type = "Unknown";
96 const char *get_system_type(void)
97 {
98  return system_type;
99 }
100 
101 static void __init sni_mem_init(void)
102 {
103  int i, memsize;
104  struct membank {
105  u32 size;
106  u32 base;
107  u32 size2;
108  u32 pad1;
109  u32 pad2;
110  } memconf[8];
111  int brd_type = *(unsigned char *)SNI_IDPROM_BRDTYPE;
112 
113 
114  /* MemSIZE from prom in 16MByte chunks */
115  memsize = *((unsigned char *) SNI_IDPROM_MEMSIZE) * 16;
116 
117  pr_debug("IDProm memsize: %u MByte\n", memsize);
118 
119  /* get memory bank layout from prom */
120  _prom_get_memconf(&memconf);
121 
122  pr_debug("prom_get_mem_conf memory configuration:\n");
123  for (i = 0; i < 8 && memconf[i].size; i++) {
124  if (brd_type == SNI_BRD_PCI_TOWER ||
125  brd_type == SNI_BRD_PCI_TOWER_CPLUS) {
126  if (memconf[i].base >= 0x20000000 &&
127  memconf[i].base < 0x30000000)
128  memconf[i].base -= 0x20000000;
129  }
130  pr_debug("Bank%d: %08x @ %08x\n", i,
131  memconf[i].size, memconf[i].base);
132  add_memory_region(memconf[i].base, memconf[i].size,
133  BOOT_MEM_RAM);
134  }
135 }
136 
137 void __init prom_init(void)
138 {
139  int argc = fw_arg0;
140  u32 *argv = (u32 *)CKSEG0ADDR(fw_arg1);
141  int i;
142 
143  sni_mem_init();
144 
145  /* copy prom cmdline parameters to kernel cmdline */
146  for (i = 1; i < argc; i++) {
147  strcat(arcs_cmdline, (char *)CKSEG0ADDR(argv[i]));
148  if (i < (argc - 1))
149  strcat(arcs_cmdline, " ");
150  }
151 }