arch/powerpc/boot/treeboot-akebono.c

   1 /*
   2  * Copyright © 2013 Tony Breeds IBM Corporation
   3  * Copyright © 2013 Alistair Popple IBM Corporation
   4  *
   5  * Based on earlier code:
   6  *   Copyright (C) Paul Mackerras 1997.
   7  *
   8  *   Matt Porter <mporter@kernel.crashing.org>
   9  *   Copyright 2002-2005 MontaVista Software Inc.
  10  *
  11  *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  12  *   Copyright (c) 2003, 2004 Zultys Technologies
  13  *
  14  *    Copyright 2007 David Gibson, IBM Corporation.
  15  *    Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
  16  *    Copyright © 2011 David Kleikamp IBM Corporation
  17  *
  18  * This program is free software; you can redistribute it and/or
  19  * modify it under the terms of the GNU General Public License
  20  * as published by the Free Software Foundation; either version
  21  * 2 of the License, or (at your option) any later version.
  22  */
  23 #include <stdarg.h>
  24 #include <stddef.h>
  25 #include "types.h"
  26 #include "elf.h"
  27 #include "string.h"
  28 #include "stdlib.h"
  29 #include "stdio.h"
  30 #include "page.h"
  31 #include "ops.h"
  32 #include "reg.h"
  33 #include "io.h"
  34 #include "dcr.h"
  35 #include "4xx.h"
  36 #include "44x.h"
  37 #include "libfdt.h"
  38
  39 BSS_STACK(4096);
  40
  41 #define SPRN_PIR        0x11E   /* Processor Identification Register */
  42 #define USERDATA_LEN    256     /* Length of userdata passed in by PIBS */
  43 #define MAX_RANKS       0x4
  44 #define DDR3_MR0CF      0x80010011U
  45 #define CCTL0_MCO2      0x8000080FU
  46 #define CCTL0_MCO3      0x80000810U
  47 #define CCTL0_MCO4      0x80000811U
  48 #define CCTL0_MCO5      0x80000812U
  49 #define CCTL0_MCO6      0x80000813U
  50
  51 static unsigned long long ibm_akebono_memsize;
  52 static long long unsigned mac_addr;
  53
  54 static unsigned long long ibm_akebono_detect_memsize(void)
  55 {
  56         u32 reg;
  57         unsigned i;
  58         unsigned long long memsize = 0;
  59
  60         for (i = 0; i < MAX_RANKS; i++) {
  61                 reg = mfdcrx(DDR3_MR0CF + i);
  62
  63                 if (!(reg & 1))
  64                         continue;
  65
  66                 reg &= 0x0000f000;
  67                 reg >>= 12;
  68                 memsize += (0x800000ULL << reg);
  69         }
  70
  71         return memsize;
  72 }
  73
  74 static void ibm_akebono_fixups(void)
  75 {
  76         void *emac;
  77         u32 reg;
  78
  79         dt_fixup_memory(0x0ULL,  ibm_akebono_memsize);
  80
  81         /* Fixup the SD timeout frequency */
  82         mtdcrx(CCTL0_MCO4, 0x1);
  83
  84         /* Disable SD high-speed mode (which seems to be broken) */
  85         reg = mfdcrx(CCTL0_MCO2) & ~0x2;
  86         mtdcrx(CCTL0_MCO2, reg);
  87
  88         /* Set the MAC address */
  89         emac = finddevice("/plb/opb/ethernet");
  90         if (emac > 0) {
  91                 if (mac_addr)
  92                         setprop(emac, "local-mac-address",
  93                                 ((u8 *) &mac_addr) + 2 , 6);
  94         }
  95 }
  96
  97 void platform_init(char *userdata)
  98 {
  99         unsigned long end_of_ram, avail_ram;
 100         u32 pir_reg;
 101         int node, size;
 102         const u32 *timebase;
 103         int len, i, userdata_len;
 104         char *end;
 105
 106         userdata[USERDATA_LEN - 1] = '\0';
 107         userdata_len = strlen(userdata);
 108         for (i = 0; i < userdata_len - 15; i++) {
 109                 if (strncmp(&userdata[i], "local-mac-addr=", 15) == 0) {
 110                         if (i > 0 && userdata[i - 1] != ' ') {
 111                                 /* We've only found a substring ending
 112                                  * with local-mac-addr so this isn't
 113                                  * our mac address. */
 114                                 continue;
 115                         }
 116
 117                         mac_addr = strtoull(&userdata[i + 15], &end, 16);
 118
 119                         /* Remove the "local-mac-addr=<...>" from the kernel
 120                          * command line, including the tailing space if
 121                          * present. */
 122                         if (*end == ' ')
 123                                 end++;
 124
 125                         len = ((int) end) - ((int) &userdata[i]);
 126                         memmove(&userdata[i], end,
 127                                 userdata_len - (len + i) + 1);
 128                         break;
 129                 }
 130         }
 131
 132         loader_info.cmdline = userdata;
 133         loader_info.cmdline_len = 256;
 134
 135         ibm_akebono_memsize = ibm_akebono_detect_memsize();
 136         if (ibm_akebono_memsize >> 32)
 137                 end_of_ram = ~0UL;
 138         else
 139                 end_of_ram = ibm_akebono_memsize;
 140         avail_ram = end_of_ram - (unsigned long)_end;
 141
 142         simple_alloc_init(_end, avail_ram, 128, 64);
 143         platform_ops.fixups = ibm_akebono_fixups;
 144         platform_ops.exit = ibm44x_dbcr_reset;
 145         pir_reg = mfspr(SPRN_PIR);
 146
 147         /* Make sure FDT blob is sane */
 148         if (fdt_check_header(_dtb_start) != 0)
 149                 fatal("Invalid device tree blob\n");
 150
 151         node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
 152                                              "cpu", sizeof("cpu"));
 153         if (!node)
 154                 fatal("Cannot find cpu node\n");
 155         timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
 156         if (timebase && (size == 4))
 157                 timebase_period_ns = 1000000000 / *timebase;
 158
 159         fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
 160         fdt_init(_dtb_start);
 161
 162         serial_console_init();
 163 }