root/arch/powerpc/boot/treeboot-akebono.c

DEFINITIONS

1. ibm_akebono_detect_memsize
2. ibm_akebono_fixups
3. platform_init

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright © 2013 Tony Breeds IBM Corporation
   4  * Copyright © 2013 Alistair Popple IBM Corporation
   5  *
   6  * Based on earlier code:
   7  *   Copyright (C) Paul Mackerras 1997.
   8  *
   9  *   Matt Porter <mporter@kernel.crashing.org>
  10  *   Copyright 2002-2005 MontaVista Software Inc.
  11  *
  12  *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  13  *   Copyright (c) 2003, 2004 Zultys Technologies
  14  *
  15  *    Copyright 2007 David Gibson, IBM Corporation.
  16  *    Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
  17  *    Copyright © 2011 David Kleikamp IBM Corporation
  18  */
  19 #include <stdarg.h>
  20 #include <stddef.h>
  21 #include "types.h"
  22 #include "elf.h"
  23 #include "string.h"
  24 #include "stdlib.h"
  25 #include "stdio.h"
  26 #include "page.h"
  27 #include "ops.h"
  28 #include "reg.h"
  29 #include "io.h"
  30 #include "dcr.h"
  31 #include "4xx.h"
  32 #include "44x.h"
  33 #include "libfdt.h"
  34 
  35 BSS_STACK(4096);
  36 
  37 #define SPRN_PIR        0x11E   /* Processor Identification Register */
  38 #define USERDATA_LEN    256     /* Length of userdata passed in by PIBS */
  39 #define MAX_RANKS       0x4
  40 #define DDR3_MR0CF      0x80010011U
  41 #define CCTL0_MCO2      0x8000080FU
  42 #define CCTL0_MCO3      0x80000810U
  43 #define CCTL0_MCO4      0x80000811U
  44 #define CCTL0_MCO5      0x80000812U
  45 #define CCTL0_MCO6      0x80000813U
  46 
  47 static unsigned long long ibm_akebono_memsize;
  48 static long long unsigned mac_addr;
  49 
  50 static unsigned long long ibm_akebono_detect_memsize(void)
  51 {
  52         u32 reg;
  53         unsigned i;
  54         unsigned long long memsize = 0;
  55 
  56         for (i = 0; i < MAX_RANKS; i++) {
  57                 reg = mfdcrx(DDR3_MR0CF + i);
  58 
  59                 if (!(reg & 1))
  60                         continue;
  61 
  62                 reg &= 0x0000f000;
  63                 reg >>= 12;
  64                 memsize += (0x800000ULL << reg);
  65         }
  66 
  67         return memsize;
  68 }
  69 
  70 static void ibm_akebono_fixups(void)
  71 {
  72         void *emac;
  73         u32 reg;
  74 
  75         dt_fixup_memory(0x0ULL,  ibm_akebono_memsize);
  76 
  77         /* Fixup the SD timeout frequency */
  78         mtdcrx(CCTL0_MCO4, 0x1);
  79 
  80         /* Disable SD high-speed mode (which seems to be broken) */
  81         reg = mfdcrx(CCTL0_MCO2) & ~0x2;
  82         mtdcrx(CCTL0_MCO2, reg);
  83 
  84         /* Set the MAC address */
  85         emac = finddevice("/plb/opb/ethernet");
  86         if (emac > 0) {
  87                 if (mac_addr)
  88                         setprop(emac, "local-mac-address",
  89                                 ((u8 *) &mac_addr) + 2 , 6);
  90         }
  91 }
  92 
  93 void platform_init(char *userdata)
  94 {
  95         unsigned long end_of_ram, avail_ram;
  96         u32 pir_reg;
  97         int node, size;
  98         const u32 *timebase;
  99         int len, i, userdata_len;
 100         char *end;
 101 
 102         userdata[USERDATA_LEN - 1] = '\0';
 103         userdata_len = strlen(userdata);
 104         for (i = 0; i < userdata_len - 15; i++) {
 105                 if (strncmp(&userdata[i], "local-mac-addr=", 15) == 0) {
 106                         if (i > 0 && userdata[i - 1] != ' ') {
 107                                 /* We've only found a substring ending
 108                                  * with local-mac-addr so this isn't
 109                                  * our mac address. */
 110                                 continue;
 111                         }
 112 
 113                         mac_addr = strtoull(&userdata[i + 15], &end, 16);
 114 
 115                         /* Remove the "local-mac-addr=<...>" from the kernel
 116                          * command line, including the tailing space if
 117                          * present. */
 118                         if (*end == ' ')
 119                                 end++;
 120 
 121                         len = ((int) end) - ((int) &userdata[i]);
 122                         memmove(&userdata[i], end,
 123                                 userdata_len - (len + i) + 1);
 124                         break;
 125                 }
 126         }
 127 
 128         loader_info.cmdline = userdata;
 129         loader_info.cmdline_len = 256;
 130 
 131         ibm_akebono_memsize = ibm_akebono_detect_memsize();
 132         if (ibm_akebono_memsize >> 32)
 133                 end_of_ram = ~0UL;
 134         else
 135                 end_of_ram = ibm_akebono_memsize;
 136         avail_ram = end_of_ram - (unsigned long)_end;
 137 
 138         simple_alloc_init(_end, avail_ram, 128, 64);
 139         platform_ops.fixups = ibm_akebono_fixups;
 140         platform_ops.exit = ibm44x_dbcr_reset;
 141         pir_reg = mfspr(SPRN_PIR);
 142 
 143         /* Make sure FDT blob is sane */
 144         if (fdt_check_header(_dtb_start) != 0)
 145                 fatal("Invalid device tree blob\n");
 146 
 147         node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
 148                                              "cpu", sizeof("cpu"));
 149         if (!node)
 150                 fatal("Cannot find cpu node\n");
 151         timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
 152         if (timebase && (size == 4))
 153                 timebase_period_ns = 1000000000 / *timebase;
 154 
 155         fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
 156         fdt_init(_dtb_start);
 157 
 158         serial_console_init();
 159 }