arch/mips/momentum/jaguar_atx/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  * Added changes for SMP - Manish Lachwani (lachwani@pmc-sierra.com)
  18  */
  19 #include <linux/init.h>
  20 #include <linux/mm.h>
  21 #include <linux/sched.h>
  22 #include <linux/bootmem.h>
  23 #include <linux/mv643xx.h>
  24
  25 #include <asm/addrspace.h>
  26 #include <asm/bootinfo.h>
  27 #include <asm/pmon.h>
  28
  29 #include "jaguar_atx_fpga.h"
  30
  31 extern void ja_setup_console(void);
  32
  33 struct callvectors *debug_vectors;
  34
  35 extern unsigned long cpu_clock;
  36
  37 const char *get_system_type(void)
  38 {
  39         return "Momentum Jaguar-ATX";
  40 }
  41
  42 #ifdef CONFIG_MV643XX_ETH
  43 extern unsigned char prom_mac_addr_base[6];
  44
  45 static void burn_clocks(void)
  46 {
  47         int i;
  48
  49         /* this loop should burn at least 1us -- this should be plenty */
  50         for (i = 0; i < 0x10000; i++)
  51                 ;
  52 }
  53
  54 static u8 exchange_bit(u8 val, u8 cs)
  55 {
  56         /* place the data */
  57         JAGUAR_FPGA_WRITE((val << 2) | cs, EEPROM_MODE);
  58         burn_clocks();
  59
  60         /* turn the clock on */
  61         JAGUAR_FPGA_WRITE((val << 2) | cs | 0x2, EEPROM_MODE);
  62         burn_clocks();
  63
  64         /* turn the clock off and read-strobe */
  65         JAGUAR_FPGA_WRITE((val << 2) | cs | 0x10, EEPROM_MODE);
  66
  67         /* return the data */
  68         return ((JAGUAR_FPGA_READ(EEPROM_MODE) >> 3) & 0x1);
  69 }
  70
  71 void get_mac(char dest[6])
  72 {
  73         u8 read_opcode[12] = {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
  74         int i,j;
  75
  76         for (i = 0; i < 12; i++)
  77                 exchange_bit(read_opcode[i], 1);
  78
  79         for (j = 0; j < 6; j++) {
  80                 dest[j] = 0;
  81                 for (i = 0; i < 8; i++) {
  82                         dest[j] <<= 1;
  83                         dest[j] |= exchange_bit(0, 1);
  84                 }
  85         }
  86
  87         /* turn off CS */
  88         exchange_bit(0,0);
  89 }
  90 #endif
  91
  92 #ifdef CONFIG_64BIT
  93
  94 unsigned long signext(unsigned long addr)
  95 {
  96         addr &= 0xffffffff;
  97         return (unsigned long)((int)addr);
  98 }
  99
 100 void *get_arg(unsigned long args, int arc)
 101 {
 102         unsigned long ul;
 103         unsigned char *puc, uc;
 104
 105         args += (arc * 4);
 106         ul = (unsigned long)signext(args);
 107         puc = (unsigned char *)ul;
 108         if (puc == 0)
 109                 return (void *)0;
 110
 111 #ifdef CONFIG_CPU_LITTLE_ENDIAN
 112         uc = *puc++;
 113         l = (unsigned long)uc;
 114         uc = *puc++;
 115         ul |= (((unsigned long)uc) << 8);
 116         uc = *puc++;
 117         ul |= (((unsigned long)uc) << 16);
 118         uc = *puc++;
 119         ul |= (((unsigned long)uc) << 24);
 120 #else
 121         uc = *puc++;
 122         ul = ((unsigned long)uc) << 24;
 123         uc = *puc++;
 124         ul |= (((unsigned long)uc) << 16);
 125         uc = *puc++;
 126         ul |= (((unsigned long)uc) << 8);
 127         uc = *puc++;
 128         ul |= ((unsigned long)uc);
 129 #endif
 130         ul = signext(ul);
 131
 132         return (void *)ul;
 133 }
 134
 135 char *arg64(unsigned long addrin, int arg_index)
 136 {
 137         unsigned long args;
 138         char *p;
 139
 140         args = signext(addrin);
 141         p = (char *)get_arg(args, arg_index);
 142
 143         return p;
 144 }
 145 #endif  /* CONFIG_64BIT */
 146
 147 /* PMON passes arguments in C main() style */
 148 void __init prom_init(void)
 149 {
 150         int argc = fw_arg0;
 151         char **arg = (char **) fw_arg1;
 152         char **env = (char **) fw_arg2;
 153         struct callvectors *cv = (struct callvectors *) fw_arg3;
 154         int i;
 155
 156 #ifdef CONFIG_SERIAL_8250_CONSOLE
 157 //      ja_setup_console();     /* The very first thing.  */
 158 #endif
 159
 160 #ifdef CONFIG_64BIT
 161         char *ptr;
 162
 163         printk("Mips64 Jaguar-ATX\n");
 164         /* save the PROM vectors for debugging use */
 165         debug_vectors = (struct callvectors *)signext((unsigned long)cv);
 166
 167         /* arg[0] is "g", the rest is boot parameters */
 168         arcs_cmdline[0] = '\0';
 169
 170         for (i = 1; i < argc; i++) {
 171                 ptr = (char *)arg64((unsigned long)arg, i);
 172                 if ((strlen(arcs_cmdline) + strlen(ptr) + 1) >=
 173                     sizeof(arcs_cmdline))
 174                         break;
 175                 strcat(arcs_cmdline, ptr);
 176                 strcat(arcs_cmdline, " ");
 177         }
 178
 179         i = 0;
 180         while (1) {
 181                 ptr = (char *)arg64((unsigned long)env, i);
 182                 if (! ptr)
 183                         break;
 184
 185                 if (strncmp("gtbase", ptr, strlen("gtbase")) == 0) {
 186                         marvell_base = simple_strtol(ptr + strlen("gtbase="),
 187                                                         NULL, 16);
 188
 189                         if ((marvell_base & 0xffffffff00000000) == 0)
 190                                 marvell_base |= 0xffffffff00000000;
 191
 192                         printk("marvell_base set to 0x%016lx\n", marvell_base);
 193                 }
 194                 if (strncmp("cpuclock", ptr, strlen("cpuclock")) == 0) {
 195                         cpu_clock = simple_strtol(ptr + strlen("cpuclock="),
 196                                                         NULL, 10);
 197                         printk("cpu_clock set to %d\n", cpu_clock);
 198                 }
 199                 i++;
 200         }
 201         printk("arcs_cmdline: %s\n", arcs_cmdline);
 202
 203 #else   /* CONFIG_64BIT */
 204         /* save the PROM vectors for debugging use */
 205         debug_vectors = cv;
 206
 207         /* arg[0] is "g", the rest is boot parameters */
 208         arcs_cmdline[0] = '\0';
 209         for (i = 1; i < argc; i++) {
 210                 if (strlen(arcs_cmdline) + strlen(arg[i] + 1)
 211                     >= sizeof(arcs_cmdline))
 212                         break;
 213                 strcat(arcs_cmdline, arg[i]);
 214                 strcat(arcs_cmdline, " ");
 215         }
 216
 217         while (*env) {
 218                 if (strncmp("gtbase", *env, strlen("gtbase")) == 0) {
 219                         marvell_base = simple_strtol(*env + strlen("gtbase="),
 220                                                         NULL, 16);
 221                 }
 222                 if (strncmp("cpuclock", *env, strlen("cpuclock")) == 0) {
 223                         cpu_clock = simple_strtol(*env + strlen("cpuclock="),
 224                                                         NULL, 10);
 225                 }
 226                 env++;
 227         }
 228 #endif /* CONFIG_64BIT */
 229         mips_machgroup = MACH_GROUP_MOMENCO;
 230         mips_machtype = MACH_MOMENCO_JAGUAR_ATX;
 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
 238 unsigned long __init prom_free_prom_memory(void)
 239 {
 240         return 0;
 241 }
 242
 243 void __init prom_fixup_mem_map(unsigned long start, unsigned long end)
 244 {
 245 }
 246
 247 int prom_boot_secondary(int cpu, unsigned long sp, unsigned long gp)
 248 {
 249         /* Clear the semaphore */
 250         *(volatile uint32_t *)(0xbb000a68) = 0x80000000;
 251
 252         return 1;
 253 }
 254
 255 void prom_init_secondary(void)
 256 {
 257         clear_c0_config(CONF_CM_CMASK);
 258         set_c0_config(0x2);
 259
 260         clear_c0_status(ST0_IM);
 261         set_c0_status(0x1ffff);
 262 }
 263
 264 void prom_smp_finish(void)
 265 {
 266 }