fw/sni/sniprom.c

0001 /*
0002  * Big Endian PROM code for SNI RM machines
0003  *
0004  * This file is subject to the terms and conditions of the GNU General Public
0005  * License.  See the file "COPYING" in the main directory of this archive
0006  * for more details.
0007  *
0008  * Copyright (C) 2005-2006 Florian Lohoff (flo@rfc822.org)
0009  * Copyright (C) 2005-2006 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
0010  */
0011
0012 #include <linux/kernel.h>
0013 #include <linux/init.h>
0014 #include <linux/memblock.h>
0015 #include <linux/string.h>
0016 #include <linux/console.h>
0017
0018 #include <asm/addrspace.h>
0019 #include <asm/sni.h>
0020 #include <asm/mipsprom.h>
0021 #include <asm/mipsregs.h>
0022 #include <asm/bootinfo.h>
0023 #include <asm/setup.h>
0024
0025 /* special SNI prom calls */
0026 /*
0027  * This does not exist in all proms - SINIX compares
0028  * the prom env variable "version" against "2.0008"
0029  * or greater. If lesser it tries to probe interesting
0030  * registers
0031  */
0032 #define PROM_GET_MEMCONF    58
0033 #define PROM_GET_HWCONF     61
0034
0035 #define PROM_VEC        (u64 *)CKSEG1ADDR(0x1fc00000)
0036 #define PROM_ENTRY(x)       (PROM_VEC + (x))
0037
0038 #define ___prom_putchar     ((int *(*)(int))PROM_ENTRY(PROM_PUTCHAR))
0039 #define ___prom_getenv      ((char *(*)(char *))PROM_ENTRY(PROM_GETENV))
0040 #define ___prom_get_memconf ((void (*)(void *))PROM_ENTRY(PROM_GET_MEMCONF))
0041 #define ___prom_get_hwconf  ((u32 (*)(void))PROM_ENTRY(PROM_GET_HWCONF))
0042
0043 #ifdef CONFIG_64BIT
0044
0045 /* O32 stack has to be 8-byte aligned. */
0046 static u64 o32_stk[4096];
0047 #define O32_STK   (&o32_stk[ARRAY_SIZE(o32_stk)])
0048
0049 #define __PROM_O32(fun, arg) fun arg __asm__(#fun); \
0050                      __asm__(#fun " = call_o32")
0051
0052 int   __PROM_O32(__prom_putchar, (int *(*)(int), void *, int));
0053 char *__PROM_O32(__prom_getenv, (char *(*)(char *), void *, char *));
0054 void  __PROM_O32(__prom_get_memconf, (void (*)(void *), void *, void *));
0055 u32   __PROM_O32(__prom_get_hwconf, (u32 (*)(void), void *));
0056
0057 #define _prom_putchar(x)     __prom_putchar(___prom_putchar, O32_STK, x)
0058 #define _prom_getenv(x)      __prom_getenv(___prom_getenv, O32_STK, x)
0059 #define _prom_get_memconf(x) __prom_get_memconf(___prom_get_memconf, O32_STK, x)
0060 #define _prom_get_hwconf()   __prom_get_hwconf(___prom_get_hwconf, O32_STK)
0061
0062 #else
0063 #define _prom_putchar(x)     ___prom_putchar(x)
0064 #define _prom_getenv(x)      ___prom_getenv(x)
0065 #define _prom_get_memconf(x) ___prom_get_memconf(x)
0066 #define _prom_get_hwconf(x)  ___prom_get_hwconf(x)
0067 #endif
0068
0069 void prom_putchar(char c)
0070 {
0071     _prom_putchar(c);
0072 }
0073
0074
0075 char *prom_getenv(char *s)
0076 {
0077     return _prom_getenv(s);
0078 }
0079
0080 void *prom_get_hwconf(void)
0081 {
0082     u32 hwconf = _prom_get_hwconf();
0083
0084     if (hwconf == 0xffffffff)
0085         return NULL;
0086
0087     return (void *)CKSEG1ADDR(hwconf);
0088 }
0089
0090 /*
0091  * /proc/cpuinfo system type
0092  *
0093  */
0094 char *system_type = "Unknown";
0095 const char *get_system_type(void)
0096 {
0097     return system_type;
0098 }
0099
0100 static void __init sni_mem_init(void)
0101 {
0102     int i, memsize;
0103     struct membank {
0104         u32     size;
0105         u32     base;
0106         u32     size2;
0107         u32     pad1;
0108         u32     pad2;
0109     } memconf[8];
0110     int brd_type = *(unsigned char *)SNI_IDPROM_BRDTYPE;
0111
0112
0113     /* MemSIZE from prom in 16MByte chunks */
0114     memsize = *((unsigned char *) SNI_IDPROM_MEMSIZE) * 16;
0115
0116     pr_debug("IDProm memsize: %u MByte\n", memsize);
0117
0118     /* get memory bank layout from prom */
0119     _prom_get_memconf(&memconf);
0120
0121     pr_debug("prom_get_mem_conf memory configuration:\n");
0122     for (i = 0; i < 8 && memconf[i].size; i++) {
0123         if (brd_type == SNI_BRD_PCI_TOWER ||
0124             brd_type == SNI_BRD_PCI_TOWER_CPLUS) {
0125             if (memconf[i].base >= 0x20000000 &&
0126                 memconf[i].base <  0x30000000)
0127                 memconf[i].base -= 0x20000000;
0128         }
0129         pr_debug("Bank%d: %08x @ %08x\n", i,
0130             memconf[i].size, memconf[i].base);
0131         memblock_add(memconf[i].base, memconf[i].size);
0132     }
0133 }
0134
0135 void __init prom_init(void)
0136 {
0137     int argc = fw_arg0;
0138     u32 *argv = (u32 *)CKSEG0ADDR(fw_arg1);
0139     int i;
0140
0141     sni_mem_init();
0142
0143     /* copy prom cmdline parameters to kernel cmdline */
0144     for (i = 1; i < argc; i++) {
0145         strcat(arcs_cmdline, (char *)CKSEG0ADDR(argv[i]));
0146         if (i < (argc - 1))
0147             strcat(arcs_cmdline, " ");
0148     }
0149 }