2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
16 * Copyright (C) 2005 Wu Qi Ming infineon
17 * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/bootmem.h>
24 #include <asm/bootinfo.h>
28 static char buf
[1024]; /* for prom_printf() */
30 /* for voice cpu (MIPS24K) */
31 unsigned int *prom_cp1_base
;
32 unsigned int prom_cp1_size
;
34 /* for Multithreading (APRP) on MIPS34K */
35 unsigned long physical_memsize
;
37 /* early printk on asc0 or asc1 ? */
38 #ifdef CONFIG_IFXMIPS_PROM_ASC0
39 #define IFXMIPS_ASC_DIFF 0
41 #define IFXMIPS_ASC_DIFF IFXMIPS_ASC_BASE_DIFF
44 static inline u32
asc_r32(unsigned long r
)
46 return ifxmips_r32((u32
*)(IFXMIPS_ASC_BASE_ADDR
+ IFXMIPS_ASC_DIFF
+ r
));
49 static inline void asc_w32(u32 v
, unsigned long r
)
51 ifxmips_w32(v
, (u32
*)(IFXMIPS_ASC_BASE_ADDR
+ IFXMIPS_ASC_DIFF
+ r
));
54 void prom_free_prom_memory(void)
58 void prom_putchar(char c
)
62 local_irq_save(flags
);
63 while ((asc_r32(IFXMIPS_ASC_FSTAT
) & ASCFSTAT_TXFFLMASK
) >> ASCFSTAT_TXFFLOFF
)
67 asc_w32('\r', IFXMIPS_ASC_TBUF
);
68 asc_w32(c
, IFXMIPS_ASC_TBUF
);
69 local_irq_restore(flags
);
72 void prom_printf(const char *fmt
, ...)
79 l
= vsprintf(buf
, fmt
, args
);
83 for (p
= buf
; p
< buf_end
; p
++)
87 unsigned int *prom_get_cp1_base(void)
91 EXPORT_SYMBOL(prom_get_cp1_base
);
93 unsigned int prom_get_cp1_size(void)
95 /* return size im MB */
96 return prom_cp1_size
>>20;
98 EXPORT_SYMBOL(prom_get_cp1_size
);
100 void __init
prom_init(void)
103 char **argv
= (char **) fw_arg1
;
104 char **envp
= (char **) fw_arg2
;
106 int memsize
= 16; /* assume 16M as default */
109 mips_machtype
= MACH_INFINEON_IFXMIPS
;
112 argv
= (char **)KSEG1ADDR((unsigned long)argv
);
113 arcs_cmdline
[0] = '\0';
114 for (i
= 1; i
< argc
; i
++) {
115 char *a
= (char *)KSEG1ADDR(argv
[i
]);
118 /* for voice cpu on Twinpass/Danube */
119 if (cpu_data
[0].cputype
== CPU_24K
)
120 if (!strncmp(a
, "cp1_size=", 9)) {
121 prom_cp1_size
= memparse(a
+ 9, &a
);
124 if (strlen(arcs_cmdline
) + strlen(a
+ 1) >= sizeof(arcs_cmdline
)) {
125 prom_printf("cmdline overflow, skipping: %s\n", a
);
128 strcat(arcs_cmdline
, a
);
129 strcat(arcs_cmdline
, " ");
132 strcpy(&(arcs_cmdline
[0]),
133 "console=ttyS0,115200 rootfstype=squashfs,jffs2");
135 envp
= (char **)KSEG1ADDR((unsigned long)envp
);
137 char *e
= (char *)KSEG1ADDR(*envp
);
139 if (!strncmp(e
, "memsize=", 8)) {
141 memsize
= simple_strtoul(e
, NULL
, 10);
145 memsize
*= 1024 * 1024;
147 /* only on Twinpass/Danube a second CPU is used for Voice */
148 if ((cpu_data
[0].cputype
== CPU_24K
) && (prom_cp1_size
)) {
149 memsize
-= prom_cp1_size
;
150 prom_cp1_base
= (unsigned int *)KSEG1ADDR(memsize
);
152 prom_printf("Using %dMB Ram and reserving %dMB for cp1\n",
153 memsize
>>20, prom_cp1_size
>>20);
156 add_memory_region(0x00000000, memsize
, BOOT_MEM_RAM
);