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openbios.c

/*
 * Copyright (c) 2005 DENX Software Engineering
 * Stefan Roese <sr@denx.de>
 *
 * Based on original work by
 *      2005 (c) SYSGO AG - g.jaeger@sysgo.com
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without
 * any warranty of any kind, whether express or implied.
 *
 */

#include <linux/types.h>
#include <linux/string.h>
#include <asm/ppcboot.h>
#include <asm/ibm4xx.h>
#include <asm/reg.h>
#ifdef CONFIG_40x
#include <asm/io.h>
#endif

#if defined(CONFIG_BUBINGA)
#define BOARD_INFO_VECTOR       0xFFF80B50 /* openbios 1.19 moved this vector down  - armin */
#else
#define BOARD_INFO_VECTOR     0xFFFE0B50
#endif

#ifdef CONFIG_40x
/* Supply a default Ethernet address for those eval boards that don't
 * ship with one.  This is an address from the MBX board I have, so
 * it is unlikely you will find it on your network.
 */
static      ushort      def_enet_addr[] = { 0x0800, 0x3e26, 0x1559 };

extern unsigned long timebase_period_ns;
#endif /* CONFIG_40x */

extern unsigned long decompress_kernel(unsigned long load_addr, int num_words,
                               unsigned long cksum);

/* We need to make sure that this is before the images to ensure
 * that it's in a mapped location. */
bd_t hold_resid_buf __attribute__ ((__section__ (".data.boot")));
bd_t *hold_residual = &hold_resid_buf;

typedef struct openbios_board_info {
        unsigned char    bi_s_version[4];       /* Version of this structure */
        unsigned char    bi_r_version[30];      /* Version of the IBM ROM */
        unsigned int     bi_memsize;            /* DRAM installed, in bytes */
#ifdef CONFIG_405EP
        unsigned char    bi_enetaddr[2][6];     /* Local Ethernet MAC address */
#else /* CONFIG_405EP */
        unsigned char    bi_enetaddr[6];        /* Local Ethernet MAC address */
#endif /* CONFIG_405EP */
        unsigned char    bi_pci_enetaddr[6];    /* PCI Ethernet MAC address */
        unsigned int     bi_intfreq;            /* Processor speed, in Hz */
        unsigned int     bi_busfreq;            /* PLB Bus speed, in Hz */
        unsigned int     bi_pci_busfreq;        /* PCI Bus speed, in Hz */
#ifdef CONFIG_405EP
        unsigned int     bi_opb_busfreq;        /* OPB Bus speed, in Hz */
        unsigned int     bi_pllouta_freq;       /* PLL OUTA speed, in Hz */
#endif /* CONFIG_405EP */
} openbios_bd_t;

void *
load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
            void *ign1, void *ign2)
{
#ifdef CONFIG_40x
      openbios_bd_t *openbios_bd = NULL;
      openbios_bd_t *(*get_board_info)(void) =
            (openbios_bd_t *(*)(void))(*(unsigned long *)BOARD_INFO_VECTOR);

      /*
       * On 40x platforms we not only need the MAC-addresses, but also the
       * clocks and memsize. Now try to get all values using the OpenBIOS
       * "get_board_info()" callback.
       */
      if ((openbios_bd = get_board_info()) != NULL) {
            /*
             * Copy bd_info from OpenBIOS struct into U-Boot struct
             * used by kernel
             */
              hold_residual->bi_memsize = openbios_bd->bi_memsize;
              hold_residual->bi_intfreq = openbios_bd->bi_intfreq;
              hold_residual->bi_busfreq = openbios_bd->bi_busfreq;
              hold_residual->bi_pci_busfreq = openbios_bd->bi_pci_busfreq;
            memcpy(hold_residual->bi_pci_enetaddr, openbios_bd->bi_pci_enetaddr, 6);
#ifdef CONFIG_405EP
            memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr[0], 6);
            memcpy(hold_residual->bi_enet1addr, openbios_bd->bi_enetaddr[1], 6);
              hold_residual->bi_opbfreq = openbios_bd->bi_opb_busfreq;
              hold_residual->bi_procfreq = openbios_bd->bi_pllouta_freq;
#else /* CONFIG_405EP */
            memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr, 6);
#endif /* CONFIG_405EP */
      } else {
            /* Hmmm...better try to stuff some defaults.
             */
            hold_residual->bi_memsize = 16 * 1024 * 1024;
            hold_residual->bi_intfreq = 200000000;
            hold_residual->bi_busfreq = 100000000;
            hold_residual->bi_pci_busfreq = 66666666;

            /*
             * Only supply one mac-address in this fallback
             */
            memcpy(hold_residual->bi_enetaddr, (void *)def_enet_addr, 6);
#ifdef CONFIG_405EP
              hold_residual->bi_opbfreq = 50000000;
              hold_residual->bi_procfreq = 200000000;
#endif /* CONFIG_405EP */
      }

      timebase_period_ns = 1000000000 / hold_residual->bi_intfreq;
#endif /* CONFIG_40x */

#ifdef CONFIG_440GP
      /* simply copy the MAC addresses */
      memcpy(hold_residual->bi_enetaddr,  (char *)OPENBIOS_MAC_BASE, 6);
      memcpy(hold_residual->bi_enet1addr, (char *)(OPENBIOS_MAC_BASE+OPENBIOS_MAC_OFFSET), 6);
#endif /* CONFIG_440GP */

      decompress_kernel(load_addr, num_words, cksum);

      return (void *)hold_residual;
}

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