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

DEFINITIONS

1. ibm_currituck_detect_memsize
2. ibm_currituck_fixups
3. platform_init

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright © 2011 Tony Breeds 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 #include <stdarg.h>
  19 #include <stddef.h>
  20 #include "types.h"
  21 #include "elf.h"
  22 #include "string.h"
  23 #include "stdio.h"
  24 #include "page.h"
  25 #include "ops.h"
  26 #include "reg.h"
  27 #include "io.h"
  28 #include "dcr.h"
  29 #include "4xx.h"
  30 #include "44x.h"
  31 #include "libfdt.h"
  32 
  33 BSS_STACK(4096);
  34 
  35 #define MAX_RANKS       0x4
  36 #define DDR3_MR0CF      0x80010011U
  37 
  38 static unsigned long long ibm_currituck_memsize;
  39 static unsigned long long ibm_currituck_detect_memsize(void)
  40 {
  41         u32 reg;
  42         unsigned i;
  43         unsigned long long memsize = 0;
  44 
  45         for(i = 0; i < MAX_RANKS; i++){
  46                 reg = mfdcrx(DDR3_MR0CF + i);
  47 
  48                 if (!(reg & 1))
  49                         continue;
  50 
  51                 reg &= 0x0000f000;
  52                 reg >>= 12;
  53                 memsize += (0x800000ULL << reg);
  54         }
  55 
  56         return memsize;
  57 }
  58 
  59 static void ibm_currituck_fixups(void)
  60 {
  61         void *devp = finddevice("/");
  62         u32 dma_ranges[7];
  63 
  64         dt_fixup_memory(0x0ULL,  ibm_currituck_memsize);
  65 
  66         while ((devp = find_node_by_devtype(devp, "pci"))) {
  67                 if (getprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges)) < 0) {
  68                         printf("%s: Failed to get dma-ranges\r\n", __func__);
  69                         continue;
  70                 }
  71 
  72                 dma_ranges[5] = ibm_currituck_memsize >> 32;
  73                 dma_ranges[6] = ibm_currituck_memsize & 0xffffffffUL;
  74 
  75                 setprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges));
  76         }
  77 }
  78 
  79 #define SPRN_PIR        0x11E   /* Processor Identification Register */
  80 void platform_init(void)
  81 {
  82         unsigned long end_of_ram, avail_ram;
  83         u32 pir_reg;
  84         int node, size;
  85         const u32 *timebase;
  86 
  87         ibm_currituck_memsize = ibm_currituck_detect_memsize();
  88         if (ibm_currituck_memsize >> 32)
  89                 end_of_ram = ~0UL;
  90         else
  91                 end_of_ram = ibm_currituck_memsize;
  92         avail_ram = end_of_ram - (unsigned long)_end;
  93 
  94         simple_alloc_init(_end, avail_ram, 128, 64);
  95         platform_ops.fixups = ibm_currituck_fixups;
  96         platform_ops.exit = ibm44x_dbcr_reset;
  97         pir_reg = mfspr(SPRN_PIR);
  98 
  99         /* Make sure FDT blob is sane */
 100         if (fdt_check_header(_dtb_start) != 0)
 101                 fatal("Invalid device tree blob\n");
 102 
 103         node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
 104                                              "cpu", sizeof("cpu"));
 105         if (!node)
 106                 fatal("Cannot find cpu node\n");
 107         timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
 108         if (timebase && (size == 4))
 109                 timebase_period_ns = 1000000000 / *timebase;
 110 
 111         fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
 112         fdt_init(_dtb_start);
 113 
 114         serial_console_init();
 115 }