arch/mips/momentum/ocelot_3/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  * Copyright 2004 PMC-Sierra
   9  * Author: Manish Lachwani (lachwani@pmc-sierra.com)
  10  *
  11  * Based on Ocelot Linux port, which is
  12  * Copyright 2001 MontaVista Software Inc.
  13  * Author: jsun@mvista.com or jsun@junsun.net
  14  *
  15  * This program is free software; you can redistribute  it and/or modify it
  16  * under  the terms of  the GNU General  Public License as published by the
  17  * Free Software Foundation;  either version 2 of the  License, or (at your
  18  * option) any later version.
  19  *
  20  * Copyright (C) 2004 MontaVista Software Inc.
  21  * Author: Manish Lachwani, mlachwani@mvista.com
  22  *
  23  */
  24 #include <linux/config.h>
  25 #include <linux/init.h>
  26 #include <linux/bootmem.h>
  27 #include <linux/mv643xx.h>
  28
  29 #include <asm/addrspace.h>
  30 #include <asm/bootinfo.h>
  31 #include <asm/pmon.h>
  32 #include "ocelot_3_fpga.h"
  33
  34 struct callvectors* debug_vectors;
  35 extern unsigned long marvell_base;
  36 extern unsigned long cpu_clock;
  37
  38 #ifdef CONFIG_MV643XX_ETH
  39 extern unsigned char prom_mac_addr_base[6];
  40 #endif
  41
  42 const char *get_system_type(void)
  43 {
  44         return "Momentum Ocelot-3";
  45 }
  46
  47 #ifdef CONFIG_MV643XX_ETH
  48 void burn_clocks(void)
  49 {
  50         int i;
  51
  52         /* this loop should burn at least 1us -- this should be plenty */
  53         for (i = 0; i < 0x10000; i++)
  54                 ;
  55 }
  56
  57 u8 exchange_bit(u8 val, u8 cs)
  58 {
  59         /* place the data */
  60         OCELOT_FPGA_WRITE((val << 2) | cs, EEPROM_MODE);
  61         burn_clocks();
  62
  63         /* turn the clock on */
  64         OCELOT_FPGA_WRITE((val << 2) | cs | 0x2, EEPROM_MODE);
  65         burn_clocks();
  66
  67         /* turn the clock off and read-strobe */
  68         OCELOT_FPGA_WRITE((val << 2) | cs | 0x10, EEPROM_MODE);
  69
  70         /* return the data */
  71         return ((OCELOT_FPGA_READ(EEPROM_MODE) >> 3) & 0x1);
  72 }
  73
  74 void get_mac(char dest[6])
  75 {
  76         u8 read_opcode[12] = {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
  77         int i,j;
  78
  79         for (i = 0; i < 12; i++)
  80                 exchange_bit(read_opcode[i], 1);
  81
  82         for (j = 0; j < 6; j++) {
  83                 dest[j] = 0;
  84                 for (i = 0; i < 8; i++) {
  85                         dest[j] <<= 1;
  86                         dest[j] |= exchange_bit(0, 1);
  87                 }
  88         }
  89
  90         /* turn off CS */
  91         exchange_bit(0,0);
  92 }
  93 #endif
  94
  95
  96 #ifdef CONFIG_MIPS64
  97
  98 unsigned long signext(unsigned long addr)
  99 {
 100         addr &= 0xffffffff;
 101         return (unsigned long)((int)addr);
 102 }
 103
 104 void *get_arg(unsigned long args, int arc)
 105 {
 106         unsigned long ul;
 107         unsigned char *puc, uc;
 108
 109         args += (arc * 4);
 110         ul = (unsigned long)signext(args);
 111         puc = (unsigned char *)ul;
 112         if (puc == 0)
 113                 return (void *)0;
 114
 115 #ifdef CONFIG_CPU_LITTLE_ENDIAN
 116         uc = *puc++;
 117         ul = (unsigned long)uc;
 118         uc = *puc++;
 119         ul |= (((unsigned long)uc) << 8);
 120         uc = *puc++;
 121         ul |= (((unsigned long)uc) << 16);
 122         uc = *puc++;
 123         ul |= (((unsigned long)uc) << 24);
 124 #else  /* CONFIG_CPU_LITTLE_ENDIAN */
 125         uc = *puc++;
 126         ul = ((unsigned long)uc) << 24;
 127         uc = *puc++;
 128         ul |= (((unsigned long)uc) << 16);
 129         uc = *puc++;
 130         ul |= (((unsigned long)uc) << 8);
 131         uc = *puc++;
 132         ul |= ((unsigned long)uc);
 133 #endif  /* CONFIG_CPU_LITTLE_ENDIAN */
 134         ul = signext(ul);
 135         return (void *)ul;
 136 }
 137
 138 char *arg64(unsigned long addrin, int arg_index)
 139 {
 140         unsigned long args;
 141         char *p;
 142
 143         args = signext(addrin);
 144         p = (char *)get_arg(args, arg_index);
 145
 146         return p;
 147 }
 148 #endif  /* CONFIG_MIPS64 */
 149
 150 void __init prom_init(void)
 151 {
 152         int argc = fw_arg0;
 153         char **arg = (char **) fw_arg1;
 154         char **env = (char **) fw_arg2;
 155         struct callvectors *cv = (struct callvectors *) fw_arg3;
 156         int i;
 157
 158 #ifdef CONFIG_MIPS64
 159         char *ptr;
 160         printk("prom_init - MIPS64\n");
 161
 162         /* save the PROM vectors for debugging use */
 163         debug_vectors = (struct callvectors *)signext((unsigned long)cv);
 164
 165         /* arg[0] is "g", the rest is boot parameters */
 166         arcs_cmdline[0] = '\0';
 167
 168         for (i = 1; i < argc; i++) {
 169                 ptr = (char *)arg64((unsigned long)arg, i);
 170                 if ((strlen(arcs_cmdline) + strlen(ptr) + 1) >=
 171                     sizeof(arcs_cmdline))
 172                         break;
 173                 strcat(arcs_cmdline, ptr);
 174                 strcat(arcs_cmdline, " ");
 175         }
 176         i = 0;
 177
 178         while (1) {
 179                 ptr = (char *)arg64((unsigned long)env, i);
 180                 if (! ptr)
 181                         break;
 182
 183                 if (strncmp("gtbase", ptr, strlen("gtbase")) == 0) {
 184                         marvell_base = simple_strtol(ptr + strlen("gtbase="),
 185                                                         NULL, 16);
 186
 187                         if ((marvell_base & 0xffffffff00000000) == 0)
 188                                 marvell_base |= 0xffffffff00000000;
 189
 190                         printk("marvell_base set to 0x%016lx\n", marvell_base);
 191                 }
 192                 if (strncmp("cpuclock", ptr, strlen("cpuclock")) == 0) {
 193                         cpu_clock = simple_strtol(ptr + strlen("cpuclock="),
 194                                                         NULL, 10);
 195                         printk("cpu_clock set to %d\n", cpu_clock);
 196                 }
 197                 i++;
 198         }
 199         printk("arcs_cmdline: %s\n", arcs_cmdline);
 200
 201 #else   /* CONFIG_MIPS64 */
 202
 203         /* save the PROM vectors for debugging use */
 204         debug_vectors = cv;
 205
 206         /* arg[0] is "g", the rest is boot parameters */
 207         arcs_cmdline[0] = '\0';
 208         for (i = 1; i < argc; i++) {
 209                 if (strlen(arcs_cmdline) + strlen(arg[i] + 1)
 210                     >= sizeof(arcs_cmdline))
 211                         break;
 212                 strcat(arcs_cmdline, arg[i]);
 213                 strcat(arcs_cmdline, " ");
 214         }
 215
 216         while (*env) {
 217                 if (strncmp("gtbase", *env, strlen("gtbase")) == 0) {
 218                         marvell_base = simple_strtol(*env + strlen("gtbase="),
 219                                                         NULL, 16);
 220                 }
 221                 if (strncmp("cpuclock", *env, strlen("cpuclock")) == 0) {
 222                         cpu_clock = simple_strtol(*env + strlen("cpuclock="),
 223                                                         NULL, 10);
 224                 }
 225                 env++;
 226         }
 227 #endif /* CONFIG_MIPS64 */
 228
 229         mips_machgroup = MACH_GROUP_MOMENCO;
 230         mips_machtype = MACH_MOMENCO_OCELOT_3;
 231
 232 #ifdef CONFIG_MV643XX_ETH
 233         /* get the base MAC address for on-board ethernet ports */
 234         get_mac(prom_mac_addr_base);
 235 #endif
 236
 237 #ifndef CONFIG_MIPS64
 238         debug_vectors->printf("Booting Linux kernel...\n");
 239 #endif
 240 }
 241
 242 void __init prom_free_prom_memory(void)
 243 {
 244 }
 245
 246 void __init prom_fixup_mem_map(unsigned long start, unsigned long end)
 247 {
 248 }