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. */
46 static 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
52 int __PROM_O32(__prom_putchar, (int *(*)(int), void *, int));
53 char *__PROM_O32(__prom_getenv, (char *(*)(char *), void *, char *));
54 void __PROM_O32(__prom_get_memconf, (void (*)(void *), void *, void *));
55 u32 __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
prom_putchar(char c)69 void prom_putchar(char c)
70 {
71 _prom_putchar(c);
72 }
73
74
prom_getenv(char * s)75 char *prom_getenv(char *s)
76 {
77 return _prom_getenv(s);
78 }
79
prom_get_hwconf(void)80 void *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 */
94 char *system_type = "Unknown";
get_system_type(void)95 const char *get_system_type(void)
96 {
97 return system_type;
98 }
99
sni_mem_init(void)100 static 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
prom_init(void)135 void __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