release/src/linux/linux/arch/mips/momentum/ocelot_c/prom.c

   1 /*
   2  * Copyright 2002 Momentum Computer Inc.
   3  * Author: Matthew Dharm <mdharm@momenco.com>
   4  *
   5  * Louis Hamilton, Red Hat, Inc.
   6  *   hamilton@redhat.com  [MIPS64 modifications]
   7  *
   8  * Based on Ocelot Linux port, which is
   9  * Copyright 2001 MontaVista Software Inc.
  10  * Author: jsun@mvista.com or jsun@junsun.net
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  */
  17 #include <linux/config.h>
  18 #include <linux/init.h>
  19 #include <linux/mm.h>
  20 #include <linux/sched.h>
  21 #include <linux/bootmem.h>
  22
  23 #include <asm/addrspace.h>
  24 #include <asm/bootinfo.h>
  25 #include <asm/mv64340.h>
  26
  27 #include "ocelot_c_fpga.h"
  28
  29 struct callvectors {
  30         int     (*open) (char*, int, int);
  31         int     (*close) (int);
  32         int     (*read) (int, void*, int);
  33         int     (*write) (int, void*, int);
  34         off_t   (*lseek) (int, off_t, int);
  35         int     (*printf) (const char*, ...);
  36         void    (*cacheflush) (void);
  37         char*   (*gets) (char*);
  38 };
  39
  40 struct callvectors* debug_vectors;
  41 char arcs_cmdline[CL_SIZE];
  42
  43 extern unsigned long mv64340_base;
  44 extern unsigned long cpu_clock;
  45
  46 #ifdef CONFIG_MV64340_ETH
  47 extern unsigned char prom_mac_addr_base[6];
  48 #endif
  49
  50 const char *get_system_type(void)
  51 {
  52 #ifdef CONFIG_CPU_SR71000
  53         return "Momentum Ocelot-CS";
  54 #else
  55         return "Momentum Ocelot-C";
  56 #endif
  57 }
  58
  59 #ifdef CONFIG_MV64340_ETH
  60 static void burn_clocks(void)
  61 {
  62         int i;
  63
  64         /* this loop should burn at least 1us -- this should be plenty */
  65         for (i = 0; i < 0x10000; i++)
  66                 ;
  67 }
  68
  69 static u8 exchange_bit(u8 val, u8 cs)
  70 {
  71         /* place the data */
  72         OCELOT_FPGA_WRITE((val << 2) | cs, EEPROM_MODE);
  73         burn_clocks();
  74
  75         /* turn the clock on */
  76         OCELOT_FPGA_WRITE((val << 2) | cs | 0x2, EEPROM_MODE);
  77         burn_clocks();
  78
  79         /* turn the clock off and read-strobe */
  80         OCELOT_FPGA_WRITE((val << 2) | cs | 0x10, EEPROM_MODE);
  81
  82         /* return the data */
  83         return ((OCELOT_FPGA_READ(EEPROM_MODE) >> 3) & 0x1);
  84 }
  85
  86 void get_mac(char dest[6])
  87 {
  88         u8 read_opcode[12] = {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
  89         int i,j;
  90
  91         for (i = 0; i < 12; i++)
  92                 exchange_bit(read_opcode[i], 1);
  93
  94         for (j = 0; j < 6; j++) {
  95                 dest[j] = 0;
  96                 for (i = 0; i < 8; i++) {
  97                         dest[j] <<= 1;
  98                         dest[j] |= exchange_bit(0, 1);
  99                 }
 100         }
 101
 102         /* turn off CS */
 103         exchange_bit(0,0);
 104 }
 105 #endif
 106
 107
 108 #ifdef CONFIG_MIPS64
 109
 110 unsigned long signext(unsigned long addr)
 111 {
 112   addr &= 0xffffffff;
 113   return (unsigned long)((int)addr);
 114 }
 115
 116 void *get_arg(unsigned long args, int arc)
 117 {
 118   unsigned long ul;
 119   unsigned char *puc, uc;
 120
 121   args += (arc * 4);
 122   ul = (unsigned long)signext(args);
 123   puc = (unsigned char *)ul;
 124   if (puc == 0)
 125     return (void *)0;
 126
 127 #ifdef CONFIG_CPU_LITTLE_ENDIAN
 128   uc = *puc++;
 129   ul = (unsigned long)uc;
 130   uc = *puc++;
 131   ul |= (((unsigned long)uc) << 8);
 132   uc = *puc++;
 133   ul |= (((unsigned long)uc) << 16);
 134   uc = *puc++;
 135   ul |= (((unsigned long)uc) << 24);
 136 #else  /* CONFIG_CPU_LITTLE_ENDIAN */
 137   uc = *puc++;
 138   ul = ((unsigned long)uc) << 24;
 139   uc = *puc++;
 140   ul |= (((unsigned long)uc) << 16);
 141   uc = *puc++;
 142   ul |= (((unsigned long)uc) << 8);
 143   uc = *puc++;
 144   ul |= ((unsigned long)uc);
 145 #endif  /* CONFIG_CPU_LITTLE_ENDIAN */
 146   ul = signext(ul);
 147   return (void *)ul;
 148 }
 149
 150 char *arg64(unsigned long addrin, int arg_index)
 151 {
 152   unsigned long args;
 153   char *p;
 154   args = signext(addrin);
 155   p = (char *)get_arg(args, arg_index);
 156   return p;
 157 }
 158 #endif  /* CONFIG_MIPS64 */
 159
 160
 161 /* [jsun@junsun.net] PMON passes arguments in C main() style */
 162 void __init prom_init(int argc, char **arg, char** env, struct callvectors *cv)
 163 {
 164         int i;
 165 #ifdef CONFIG_MIPS64
 166         char *ptr;
 167
 168         printk("prom_init - MIPS64\n");
 169         /* save the PROM vectors for debugging use */
 170         debug_vectors = (struct callvectors *)signext((unsigned long)cv);
 171
 172         /* arg[0] is "g", the rest is boot parameters */
 173         arcs_cmdline[0] = '\0';
 174
 175         for (i = 1; i < argc; i++) {
 176                 ptr = (char *)arg64((unsigned long)arg, i);
 177                 if ((strlen(arcs_cmdline) + strlen(ptr) + 1) >=
 178                     sizeof(arcs_cmdline))
 179                         break;
 180                 strcat(arcs_cmdline, ptr);
 181                 strcat(arcs_cmdline, " ");
 182         }
 183         i = 0;
 184         while (1) {
 185                 ptr = (char *)arg64((unsigned long)env, i);
 186                 if (! ptr)
 187                         break;
 188
 189                 if (strncmp("gtbase", ptr, strlen("gtbase")) == 0) {
 190                         mv64340_base = simple_strtol(ptr + strlen("gtbase="),
 191                                                         NULL, 16);
 192
 193                         if ((mv64340_base & 0xffffffff00000000) == 0)
 194                                 mv64340_base |= 0xffffffff00000000;
 195
 196                         printk("mv64340_base set to 0x%016lx\n", mv64340_base);
 197                 }
 198                 if (strncmp("cpuclock", ptr, strlen("cpuclock")) == 0) {
 199                         cpu_clock = simple_strtol(ptr + strlen("cpuclock="),
 200                                                         NULL, 10);
 201                         printk("cpu_clock set to %d\n", cpu_clock);
 202                 }
 203                 i++;
 204         }
 205         printk("arcs_cmdline: %s\n", arcs_cmdline);
 206
 207 #else   /* CONFIG_MIPS64 */
 208         /* save the PROM vectors for debugging use */
 209         debug_vectors = cv;
 210
 211         /* arg[0] is "g", the rest is boot parameters */
 212         arcs_cmdline[0] = '\0';
 213         for (i = 1; i < argc; i++) {
 214                 if (strlen(arcs_cmdline) + strlen(arg[i] + 1)
 215                     >= sizeof(arcs_cmdline))
 216                         break;
 217                 strcat(arcs_cmdline, arg[i]);
 218                 strcat(arcs_cmdline, " ");
 219         }
 220
 221         while (*env) {
 222                 if (strncmp("gtbase", *env, strlen("gtbase")) == 0) {
 223                         mv64340_base = simple_strtol(*env + strlen("gtbase="),
 224                                                         NULL, 16);
 225                 }
 226                 if (strncmp("cpuclock", *env, strlen("cpuclock")) == 0) {
 227                         cpu_clock = simple_strtol(*env + strlen("cpuclock="),
 228                                                         NULL, 10);
 229                 }
 230                 env++;
 231         }
 232 #endif /* CONFIG_MIPS64 */
 233
 234         mips_machgroup = MACH_GROUP_MOMENCO;
 235         mips_machtype = MACH_MOMENCO_OCELOT_C;
 236
 237 #ifdef CONFIG_MV64340_ETH
 238         /* get the base MAC address for on-board ethernet ports */
 239         get_mac(prom_mac_addr_base);
 240 #endif
 241
 242 #ifndef CONFIG_MIPS64
 243         debug_vectors->printf("Booting Linux kernel...\n");
 244 #endif
 245 }
 246
 247 void __init prom_free_prom_memory(void)
 248 {
 249 }
 250
 251 void __init prom_fixup_mem_map(unsigned long start, unsigned long end)
 252 {
 253 }