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treeboot-walnut.c

/*
 * Old U-boot compatibility for Walnut
 *
 * Author: Josh Boyer <jwboyer@linux.vnet.ibm.com>
 *
 * Copyright 2007 IBM Corporation
 *   Based on cuboot-83xx.c, which is:
 * Copyright (c) 2007 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 */

#include "ops.h"
#include "stdio.h"
#include "dcr.h"
#include "4xx.h"
#include "io.h"

BSS_STACK(4096);

void ibm405gp_fixup_clocks(unsigned int sysclk, unsigned int ser_clk)
{
      u32 pllmr = mfdcr(DCRN_CPC0_PLLMR);
      u32 cpc0_cr0 = mfdcr(DCRN_405_CPC0_CR0);
      u32 cpc0_cr1 = mfdcr(DCRN_405_CPC0_CR1);
      u32 cpu, plb, opb, ebc, tb, uart0, uart1, m;
      u32 fwdv, fbdv, cbdv, opdv, epdv, udiv;

      fwdv = (8 - ((pllmr & 0xe0000000) >> 29));
      fbdv = (pllmr & 0x1e000000) >> 25;
      cbdv = ((pllmr & 0x00060000) >> 17) + 1;
      opdv = ((pllmr & 0x00018000) >> 15) + 1;
      epdv = ((pllmr & 0x00001800) >> 13) + 2;
      udiv = ((cpc0_cr0 & 0x3e) >> 1) + 1;

      m = fwdv * fbdv * cbdv;

      cpu = sysclk * m / fwdv;
      plb = cpu / cbdv;
      opb = plb / opdv;
      ebc = plb / epdv;

      if (cpc0_cr0 & 0x80) {
            /* uart0 uses the external clock */
            uart0 = ser_clk;
      } else {
            uart0 = cpu / udiv;
      }

      if (cpc0_cr0 & 0x40) {
            /* uart1 uses the external clock */
            uart1 = ser_clk;
      } else {
            uart1 = cpu / udiv;
      }

      /* setup the timebase clock to tick at the cpu frequency */
      cpc0_cr1 = cpc0_cr1 & ~0x00800000;
      mtdcr(DCRN_405_CPC0_CR1, cpc0_cr1);
      tb = cpu;

      dt_fixup_cpu_clocks(cpu, tb, 0);
      dt_fixup_clock("/plb", plb);
      dt_fixup_clock("/plb/opb", opb);
      dt_fixup_clock("/plb/ebc", ebc);
      dt_fixup_clock("/plb/opb/serial@ef600300", uart0);
      dt_fixup_clock("/plb/opb/serial@ef600400", uart1);
}

static void walnut_flashsel_fixup(void)
{
      void *devp, *sram;
      u32 reg_flash[3] = {0x0, 0x0, 0x80000};
      u32 reg_sram[3] = {0x0, 0x0, 0x80000};
      u8 *fpga;
      u8 fpga_brds1 = 0x0;

      devp = finddevice("/plb/ebc/fpga");
      if (!devp)
            fatal("Couldn't locate FPGA node\n\r");

      if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
            fatal("no virtual-reg property\n\r");

      fpga_brds1 = in_8(fpga);

      devp = finddevice("/plb/ebc/flash");
      if (!devp)
            fatal("Couldn't locate flash node\n\r");

      if (getprop(devp, "reg", reg_flash, sizeof(reg_flash)) != sizeof(reg_flash))
            fatal("flash reg property has unexpected size\n\r");

      sram = finddevice("/plb/ebc/sram");
      if (!sram)
            fatal("Couldn't locate sram node\n\r");

      if (getprop(sram, "reg", reg_sram, sizeof(reg_sram)) != sizeof(reg_sram))
            fatal("sram reg property has unexpected size\n\r");

      if (fpga_brds1 & 0x1) {
            reg_flash[1] ^= 0x80000;
            reg_sram[1] ^= 0x80000;
      }

      setprop(devp, "reg", reg_flash, sizeof(reg_flash));
      setprop(sram, "reg", reg_sram, sizeof(reg_sram));
}

#define WALNUT_OPENBIOS_MAC_OFF 0xfffffe0b
static void walnut_fixups(void)
{
      ibm4xx_fixup_memsize();
      ibm405gp_fixup_clocks(33330000, 0xa8c000);
      ibm4xx_quiesce_eth((u32 *)0xef600800, NULL);
      ibm4xx_fixup_ebc_ranges("/plb/ebc");
      walnut_flashsel_fixup();
      dt_fixup_mac_addresses((u8 *) WALNUT_OPENBIOS_MAC_OFF);
}

void platform_init(void)
{
      unsigned long end_of_ram = 0x2000000;
      unsigned long avail_ram = end_of_ram - (unsigned long) _end;

      simple_alloc_init(_end, avail_ram, 32, 32);
      platform_ops.fixups = walnut_fixups;
      platform_ops.exit = ibm40x_dbcr_reset;
      ft_init(_dtb_start, _dtb_end - _dtb_start, 32);
      serial_console_init();
}

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