arch/powerpc/boot/treeboot-walnut.c

   1 /*
   2  * Old U-boot compatibility for Walnut
   3  *
   4  * Author: Josh Boyer <jwboyer@linux.vnet.ibm.com>
   5  *
   6  * Copyright 2007 IBM Corporation
   7  *   Based on cuboot-83xx.c, which is:
   8  * Copyright (c) 2007 Freescale Semiconductor, Inc.
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published
  12  * by the Free Software Foundation.
  13  */
  14
  15 #include "ops.h"
  16 #include "stdio.h"
  17 #include "dcr.h"
  18 #include "4xx.h"
  19 #include "io.h"
  20
  21 BSS_STACK(4096);
  22
  23 static void walnut_flashsel_fixup(void)
  24 {
  25         void *devp, *sram;
  26         u32 reg_flash[3] = {0x0, 0x0, 0x80000};
  27         u32 reg_sram[3] = {0x0, 0x0, 0x80000};
  28         u8 *fpga;
  29         u8 fpga_brds1 = 0x0;
  30
  31         devp = finddevice("/plb/ebc/fpga");
  32         if (!devp)
  33                 fatal("Couldn't locate FPGA node\n\r");
  34
  35         if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
  36                 fatal("no virtual-reg property\n\r");
  37
  38         fpga_brds1 = in_8(fpga);
  39
  40         devp = finddevice("/plb/ebc/flash");
  41         if (!devp)
  42                 fatal("Couldn't locate flash node\n\r");
  43
  44         if (getprop(devp, "reg", reg_flash, sizeof(reg_flash)) != sizeof(reg_flash))
  45                 fatal("flash reg property has unexpected size\n\r");
  46
  47         sram = finddevice("/plb/ebc/sram");
  48         if (!sram)
  49                 fatal("Couldn't locate sram node\n\r");
  50
  51         if (getprop(sram, "reg", reg_sram, sizeof(reg_sram)) != sizeof(reg_sram))
  52                 fatal("sram reg property has unexpected size\n\r");
  53
  54         if (fpga_brds1 & 0x1) {
  55                 reg_flash[1] ^= 0x80000;
  56                 reg_sram[1] ^= 0x80000;
  57         }
  58
  59         setprop(devp, "reg", reg_flash, sizeof(reg_flash));
  60         setprop(sram, "reg", reg_sram, sizeof(reg_sram));
  61 }
  62
  63 #define WALNUT_OPENBIOS_MAC_OFF 0xfffffe0b
  64 static void walnut_fixups(void)
  65 {
  66         ibm4xx_sdram_fixup_memsize();
  67         ibm405gp_fixup_clocks(33330000, 0xa8c000);
  68         ibm4xx_quiesce_eth((u32 *)0xef600800, NULL);
  69         ibm4xx_fixup_ebc_ranges("/plb/ebc");
  70         walnut_flashsel_fixup();
  71         dt_fixup_mac_addresses((u8 *) WALNUT_OPENBIOS_MAC_OFF);
  72 }
  73
  74 void platform_init(void)
  75 {
  76         unsigned long end_of_ram = 0x2000000;
  77         unsigned long avail_ram = end_of_ram - (unsigned long) _end;
  78
  79         simple_alloc_init(_end, avail_ram, 32, 32);
  80         platform_ops.fixups = walnut_fixups;
  81         platform_ops.exit = ibm40x_dbcr_reset;
  82         fdt_init(_dtb_start);
  83         serial_console_init();
  84 }