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ibm44x_common.c

/*
 * PPC44x system library
 *
 * Matt Porter <mporter@kernel.crashing.org>
 * Copyright 2002-2005 MontaVista Software Inc.
 *
 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
 * Copyright (c) 2003, 2004 Zultys Technologies
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */
#include <linux/time.h>
#include <linux/types.h>
#include <linux/serial.h>
#include <linux/module.h>
#include <linux/initrd.h>

#include <asm/ibm44x.h>
#include <asm/mmu.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/ppc4xx_pic.h>
#include <asm/param.h>
#include <asm/bootinfo.h>
#include <asm/ppcboot.h>

#include <syslib/gen550.h>

/* Global Variables */
bd_t __res;

phys_addr_t fixup_bigphys_addr(phys_addr_t addr, phys_addr_t size)
{
      phys_addr_t page_4gb = 0;

        /*
       * Trap the least significant 32-bit portions of an
       * address in the 440's 36-bit address space.  Fix
       * them up with the appropriate ERPN
       */
      if ((addr >= PPC44x_IO_LO) && (addr <= PPC44x_IO_HI))
            page_4gb = PPC44x_IO_PAGE;
      else if ((addr >= PPC44x_PCI0CFG_LO) && (addr <= PPC44x_PCI0CFG_HI))
            page_4gb = PPC44x_PCICFG_PAGE;
#ifdef CONFIG_440SP
      else if ((addr >= PPC44x_PCI1CFG_LO) && (addr <= PPC44x_PCI1CFG_HI))
            page_4gb = PPC44x_PCICFG_PAGE;
      else if ((addr >= PPC44x_PCI2CFG_LO) && (addr <= PPC44x_PCI2CFG_HI))
            page_4gb = PPC44x_PCICFG_PAGE;
#endif
      else if ((addr >= PPC44x_PCIMEM_LO) && (addr <= PPC44x_PCIMEM_HI))
            page_4gb = PPC44x_PCIMEM_PAGE;

      return (page_4gb | addr);
};
EXPORT_SYMBOL(fixup_bigphys_addr);

void __init ibm44x_calibrate_decr(unsigned int freq)
{
      tb_ticks_per_jiffy = freq / HZ;
      tb_to_us = mulhwu_scale_factor(freq, 1000000);

      /* Set the time base to zero */
      mtspr(SPRN_TBWL, 0);
      mtspr(SPRN_TBWU, 0);

      /* Clear any pending timer interrupts */
      mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);

      /* Enable decrementer interrupt */
      mtspr(SPRN_TCR, TCR_DIE);
}

extern void abort(void);

static void ibm44x_restart(char *cmd)
{
      local_irq_disable();
      abort();
}

static void ibm44x_power_off(void)
{
      local_irq_disable();
      for(;;);
}

static void ibm44x_halt(void)
{
      local_irq_disable();
      for(;;);
}

/*
 * Read the 44x memory controller to get size of system memory.
 */
static unsigned long __init ibm44x_find_end_of_memory(void)
{
      u32 i, bank_config;
      u32 mem_size = 0;

      for (i=0; i<4; i++)
      {
            switch (i)
            {
                  case 0:
                        mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B0CR);
                        break;
                  case 1:
                        mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B1CR);
                        break;
                  case 2:
                        mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B2CR);
                        break;
                  case 3:
                        mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B3CR);
                        break;
            }

            bank_config = mfdcr(DCRN_SDRAM0_CFGDATA);

            if (!(bank_config & SDRAM_CONFIG_BANK_ENABLE))
                  continue;
            switch (SDRAM_CONFIG_BANK_SIZE(bank_config))
            {
                  case SDRAM_CONFIG_SIZE_8M:
                        mem_size += PPC44x_MEM_SIZE_8M;
                        break;
                  case SDRAM_CONFIG_SIZE_16M:
                        mem_size += PPC44x_MEM_SIZE_16M;
                        break;
                  case SDRAM_CONFIG_SIZE_32M:
                        mem_size += PPC44x_MEM_SIZE_32M;
                        break;
                  case SDRAM_CONFIG_SIZE_64M:
                        mem_size += PPC44x_MEM_SIZE_64M;
                        break;
                  case SDRAM_CONFIG_SIZE_128M:
                        mem_size += PPC44x_MEM_SIZE_128M;
                        break;
                  case SDRAM_CONFIG_SIZE_256M:
                        mem_size += PPC44x_MEM_SIZE_256M;
                        break;
                  case SDRAM_CONFIG_SIZE_512M:
                        mem_size += PPC44x_MEM_SIZE_512M;
                        break;
            }
      }
      return mem_size;
}

void __init ibm44x_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
                         unsigned long r6, unsigned long r7)
{
      parse_bootinfo(find_bootinfo());

      /*
       * If we were passed in a board information, copy it into the
       * residual data area.
       */
      if (r3)
            __res = *(bd_t *)(r3 + KERNELBASE);

#if defined(CONFIG_BLK_DEV_INITRD)
      /*
       * If the init RAM disk has been configured in, and there's a valid
       * starting address for it, set it up.
       */
      if (r4) {
            initrd_start = r4 + KERNELBASE;
            initrd_end = r5 + KERNELBASE;
      }
#endif  /* CONFIG_BLK_DEV_INITRD */

      /* Copy the kernel command line arguments to a safe place. */

      if (r6) {
            *(char *) (r7 + KERNELBASE) = 0;
            strcpy(cmd_line, (char *) (r6 + KERNELBASE));
      }

      ppc_md.init_IRQ = ppc4xx_pic_init;
      ppc_md.find_end_of_memory = ibm44x_find_end_of_memory;
      ppc_md.restart = ibm44x_restart;
      ppc_md.power_off = ibm44x_power_off;
      ppc_md.halt = ibm44x_halt;

#ifdef CONFIG_SERIAL_TEXT_DEBUG
      ppc_md.progress = gen550_progress;
#endif /* CONFIG_SERIAL_TEXT_DEBUG */
#ifdef CONFIG_KGDB
      ppc_md.kgdb_map_scc = gen550_kgdb_map_scc;
#endif

      /*
       * The Abatron BDI JTAG debugger does not tolerate others
       * mucking with the debug registers.
       */
#if !defined(CONFIG_BDI_SWITCH)
      /* Enable internal debug mode */
        mtspr(SPRN_DBCR0, (DBCR0_IDM));

      /* Clear any residual debug events */
      mtspr(SPRN_DBSR, 0xffffffff);
#endif
}

/* Called from machine_check_exception */
void platform_machine_check(struct pt_regs *regs)
{
#if defined(CONFIG_440SP) || defined(CONFIG_440SPE)
      printk("PLB0: BEAR=0x%08x%08x ACR=  0x%08x BESR= 0x%08x%08x\n",
             mfdcr(DCRN_PLB0_BEARH), mfdcr(DCRN_PLB0_BEARL),
             mfdcr(DCRN_PLB0_ACR), mfdcr(DCRN_PLB0_BESRH),
             mfdcr(DCRN_PLB0_BESRL));
      printk("PLB1: BEAR=0x%08x%08x ACR=  0x%08x BESR= 0x%08x%08x\n",
             mfdcr(DCRN_PLB1_BEARH), mfdcr(DCRN_PLB1_BEARL),
             mfdcr(DCRN_PLB1_ACR), mfdcr(DCRN_PLB1_BESRH),
             mfdcr(DCRN_PLB1_BESRL));
#else
      printk("PLB0: BEAR=0x%08x%08x ACR=  0x%08x BESR= 0x%08x\n",
            mfdcr(DCRN_PLB0_BEARH), mfdcr(DCRN_PLB0_BEARL),
            mfdcr(DCRN_PLB0_ACR),  mfdcr(DCRN_PLB0_BESR));
#endif
      printk("POB0: BEAR=0x%08x%08x BESR0=0x%08x BESR1=0x%08x\n",
            mfdcr(DCRN_POB0_BEARH), mfdcr(DCRN_POB0_BEARL),
            mfdcr(DCRN_POB0_BESR0), mfdcr(DCRN_POB0_BESR1));
      printk("OPB0: BEAR=0x%08x%08x BSTAT=0x%08x\n",
            mfdcr(DCRN_OPB0_BEARH), mfdcr(DCRN_OPB0_BEARL),
            mfdcr(DCRN_OPB0_BSTAT));
}

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