release/src-rt-6.x/linux/linux-2.6/arch/ppc/boot/simple/openbios.c

   1 /*
   2  * Copyright (c) 2005 DENX Software Engineering
   3  * Stefan Roese <sr@denx.de>
   4  *
   5  * Based on original work by
   6  *      2005 (c) SYSGO AG - g.jaeger@sysgo.com
   7  *
   8  * This file is licensed under the terms of the GNU General Public
   9  * License version 2.  This program is licensed "as is" without
  10  * any warranty of any kind, whether express or implied.
  11  *
  12  */
  13
  14 #include <linux/types.h>
  15 #include <linux/string.h>
  16 #include <asm/ppcboot.h>
  17 #include <asm/ibm4xx.h>
  18 #include <asm/reg.h>
  19 #ifdef CONFIG_40x
  20 #include <asm/io.h>
  21 #endif
  22
  23 #if defined(CONFIG_BUBINGA)
  24 #define BOARD_INFO_VECTOR       0xFFF80B50 /* openbios 1.19 moved this vector down  - armin */
  25 #else
  26 #define BOARD_INFO_VECTOR       0xFFFE0B50
  27 #endif
  28
  29 #ifdef CONFIG_40x
  30 /* Supply a default Ethernet address for those eval boards that don't
  31  * ship with one.  This is an address from the MBX board I have, so
  32  * it is unlikely you will find it on your network.
  33  */
  34 static  ushort  def_enet_addr[] = { 0x0800, 0x3e26, 0x1559 };
  35
  36 extern unsigned long timebase_period_ns;
  37 #endif /* CONFIG_40x */
  38
  39 extern unsigned long decompress_kernel(unsigned long load_addr, int num_words,
  40                                        unsigned long cksum);
  41
  42 /* We need to make sure that this is before the images to ensure
  43  * that it's in a mapped location. */
  44 bd_t hold_resid_buf __attribute__ ((__section__ (".data.boot")));
  45 bd_t *hold_residual = &hold_resid_buf;
  46
  47 typedef struct openbios_board_info {
  48         unsigned char    bi_s_version[4];       /* Version of this structure */
  49         unsigned char    bi_r_version[30];      /* Version of the IBM ROM */
  50         unsigned int     bi_memsize;            /* DRAM installed, in bytes */
  51 #ifdef CONFIG_405EP
  52         unsigned char    bi_enetaddr[2][6];     /* Local Ethernet MAC address */
  53 #else /* CONFIG_405EP */
  54         unsigned char    bi_enetaddr[6];        /* Local Ethernet MAC address */
  55 #endif /* CONFIG_405EP */
  56         unsigned char    bi_pci_enetaddr[6];    /* PCI Ethernet MAC address */
  57         unsigned int     bi_intfreq;            /* Processor speed, in Hz */
  58         unsigned int     bi_busfreq;            /* PLB Bus speed, in Hz */
  59         unsigned int     bi_pci_busfreq;        /* PCI Bus speed, in Hz */
  60 #ifdef CONFIG_405EP
  61         unsigned int     bi_opb_busfreq;        /* OPB Bus speed, in Hz */
  62         unsigned int     bi_pllouta_freq;       /* PLL OUTA speed, in Hz */
  63 #endif /* CONFIG_405EP */
  64 } openbios_bd_t;
  65
  66 void *
  67 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
  68                 void *ign1, void *ign2)
  69 {
  70 #ifdef CONFIG_40x
  71         openbios_bd_t *openbios_bd = NULL;
  72         openbios_bd_t *(*get_board_info)(void) =
  73                 (openbios_bd_t *(*)(void))(*(unsigned long *)BOARD_INFO_VECTOR);
  74
  75         /*
  76          * On 40x platforms we not only need the MAC-addresses, but also the
  77          * clocks and memsize. Now try to get all values using the OpenBIOS
  78          * "get_board_info()" callback.
  79          */
  80         if ((openbios_bd = get_board_info()) != NULL) {
  81                 /*
  82                  * Copy bd_info from OpenBIOS struct into U-Boot struct
  83                  * used by kernel
  84                  */
  85                 hold_residual->bi_memsize = openbios_bd->bi_memsize;
  86                 hold_residual->bi_intfreq = openbios_bd->bi_intfreq;
  87                 hold_residual->bi_busfreq = openbios_bd->bi_busfreq;
  88                 hold_residual->bi_pci_busfreq = openbios_bd->bi_pci_busfreq;
  89                 memcpy(hold_residual->bi_pci_enetaddr, openbios_bd->bi_pci_enetaddr, 6);
  90 #ifdef CONFIG_405EP
  91                 memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr[0], 6);
  92                 memcpy(hold_residual->bi_enet1addr, openbios_bd->bi_enetaddr[1], 6);
  93                 hold_residual->bi_opbfreq = openbios_bd->bi_opb_busfreq;
  94                 hold_residual->bi_procfreq = openbios_bd->bi_pllouta_freq;
  95 #else /* CONFIG_405EP */
  96                 memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr, 6);
  97 #endif /* CONFIG_405EP */
  98         } else {
  99                 /* Hmmm...better try to stuff some defaults.
 100                  */
 101                 hold_residual->bi_memsize = 16 * 1024 * 1024;
 102                 hold_residual->bi_intfreq = 200000000;
 103                 hold_residual->bi_busfreq = 100000000;
 104                 hold_residual->bi_pci_busfreq = 66666666;
 105
 106                 /*
 107                  * Only supply one mac-address in this fallback
 108                  */
 109                 memcpy(hold_residual->bi_enetaddr, (void *)def_enet_addr, 6);
 110 #ifdef CONFIG_405EP
 111                 hold_residual->bi_opbfreq = 50000000;
 112                 hold_residual->bi_procfreq = 200000000;
 113 #endif /* CONFIG_405EP */
 114         }
 115
 116         timebase_period_ns = 1000000000 / hold_residual->bi_intfreq;
 117 #endif /* CONFIG_40x */
 118
 119 #ifdef CONFIG_440GP
 120         /* simply copy the MAC addresses */
 121         memcpy(hold_residual->bi_enetaddr,  (char *)OPENBIOS_MAC_BASE, 6);
 122         memcpy(hold_residual->bi_enet1addr, (char *)(OPENBIOS_MAC_BASE+OPENBIOS_MAC_OFFSET), 6);
 123 #endif /* CONFIG_440GP */
 124
 125         decompress_kernel(load_addr, num_words, cksum);
 126
 127         return (void *)hold_residual;
 128 }