arch/powerpc/boot/treeboot-walnut.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Old U-boot compatibility for Walnut
   4  *
   5  * Author: Josh Boyer <jwboyer@linux.vnet.ibm.com>
   6  *
   7  * Copyright 2007 IBM Corporation
   8  *   Based on cuboot-83xx.c, which is:
   9  * Copyright (c) 2007 Freescale Semiconductor, Inc.
  10  */
  11
  12 #include "ops.h"
  13 #include "stdio.h"
  14 #include "dcr.h"
  15 #include "4xx.h"
  16 #include "io.h"
  17
  18 BSS_STACK(4096);
  19
  20 static void walnut_flashsel_fixup(void)
  21 {
  22         void *devp, *sram;
  23         u32 reg_flash[3] = {0x0, 0x0, 0x80000};
  24         u32 reg_sram[3] = {0x0, 0x0, 0x80000};
  25         u8 *fpga;
  26         u8 fpga_brds1 = 0x0;
  27
  28         devp = finddevice("/plb/ebc/fpga");
  29         if (!devp)
  30                 fatal("Couldn't locate FPGA node\n\r");
  31
  32         if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
  33                 fatal("no virtual-reg property\n\r");
  34
  35         fpga_brds1 = in_8(fpga);
  36
  37         devp = finddevice("/plb/ebc/flash");
  38         if (!devp)
  39                 fatal("Couldn't locate flash node\n\r");
  40
  41         if (getprop(devp, "reg", reg_flash, sizeof(reg_flash)) != sizeof(reg_flash))
  42                 fatal("flash reg property has unexpected size\n\r");
  43
  44         sram = finddevice("/plb/ebc/sram");
  45         if (!sram)
  46                 fatal("Couldn't locate sram node\n\r");
  47
  48         if (getprop(sram, "reg", reg_sram, sizeof(reg_sram)) != sizeof(reg_sram))
  49                 fatal("sram reg property has unexpected size\n\r");
  50
  51         if (fpga_brds1 & 0x1) {
  52                 reg_flash[1] ^= 0x80000;
  53                 reg_sram[1] ^= 0x80000;
  54         }
  55
  56         setprop(devp, "reg", reg_flash, sizeof(reg_flash));
  57         setprop(sram, "reg", reg_sram, sizeof(reg_sram));
  58 }
  59
  60 #define WALNUT_OPENBIOS_MAC_OFF 0xfffffe0b
  61 static void walnut_fixups(void)
  62 {
  63         ibm4xx_sdram_fixup_memsize();
  64         ibm405gp_fixup_clocks(33330000, 0xa8c000);
  65         ibm4xx_quiesce_eth((u32 *)0xef600800, NULL);
  66         ibm4xx_fixup_ebc_ranges("/plb/ebc");
  67         walnut_flashsel_fixup();
  68         dt_fixup_mac_address_by_alias("ethernet0", (u8 *) WALNUT_OPENBIOS_MAC_OFF);
  69 }
  70
  71 void platform_init(void)
  72 {
  73         unsigned long end_of_ram = 0x2000000;
  74         unsigned long avail_ram = end_of_ram - (unsigned long) _end;
  75
  76         simple_alloc_init(_end, avail_ram, 32, 32);
  77         platform_ops.fixups = walnut_fixups;
  78         platform_ops.exit = ibm40x_dbcr_reset;
  79         fdt_init(_dtb_start);
  80         serial_console_init();
  81 }