arch/ppc/boot/simple/openbios.c

   1 /*
   2  * arch/ppc/boot/simple/openbios.c
   3  *
   4  * Copyright (c) 2005 DENX Software Engineering
   5  * Stefan Roese <sr@denx.de>
   6  *
   7  * Based on original work by
   8  *      2005 (c) SYSGO AG - g.jaeger@sysgo.com
   9  *
  10  * This file is licensed under the terms of the GNU General Public
  11  * License version 2.  This program is licensed "as is" without
  12  * any warranty of any kind, whether express or implied.
  13  *
  14  */
  15
  16 #include <linux/types.h>
  17 #include <linux/config.h>
  18 #include <linux/string.h>
  19 #include <asm/ppcboot.h>
  20 #include <asm/ibm4xx.h>
  21 #include <asm/reg.h>
  22 #ifdef CONFIG_40x
  23 #include <asm/io.h>
  24 #endif
  25
  26 #if defined(CONFIG_BUBINGA)
  27 #define BOARD_INFO_VECTOR       0xFFF80B50 /* openbios 1.19 moved this vector down  - armin */
  28 #else
  29 #define BOARD_INFO_VECTOR       0xFFFE0B50
  30 #endif
  31
  32 #ifdef CONFIG_40x
  33 /* Supply a default Ethernet address for those eval boards that don't
  34  * ship with one.  This is an address from the MBX board I have, so
  35  * it is unlikely you will find it on your network.
  36  */
  37 static  ushort  def_enet_addr[] = { 0x0800, 0x3e26, 0x1559 };
  38
  39 extern unsigned long timebase_period_ns;
  40 #endif /* CONFIG_40x */
  41
  42 extern unsigned long decompress_kernel(unsigned long load_addr, int num_words,
  43                                        unsigned long cksum);
  44
  45 /* We need to make sure that this is before the images to ensure
  46  * that it's in a mapped location. */
  47 bd_t hold_resid_buf __attribute__ ((__section__ (".data.boot")));
  48 bd_t *hold_residual = &hold_resid_buf;
  49
  50 typedef struct openbios_board_info {
  51         unsigned char    bi_s_version[4];       /* Version of this structure */
  52         unsigned char    bi_r_version[30];      /* Version of the IBM ROM */
  53         unsigned int     bi_memsize;            /* DRAM installed, in bytes */
  54 #ifdef CONFIG_405EP
  55         unsigned char    bi_enetaddr[2][6];     /* Local Ethernet MAC address */
  56 #else /* CONFIG_405EP */
  57         unsigned char    bi_enetaddr[6];        /* Local Ethernet MAC address */
  58 #endif /* CONFIG_405EP */
  59         unsigned char    bi_pci_enetaddr[6];    /* PCI Ethernet MAC address */
  60         unsigned int     bi_intfreq;            /* Processor speed, in Hz */
  61         unsigned int     bi_busfreq;            /* PLB Bus speed, in Hz */
  62         unsigned int     bi_pci_busfreq;        /* PCI Bus speed, in Hz */
  63 #ifdef CONFIG_405EP
  64         unsigned int     bi_opb_busfreq;        /* OPB Bus speed, in Hz */
  65         unsigned int     bi_pllouta_freq;       /* PLL OUTA speed, in Hz */
  66 #endif /* CONFIG_405EP */
  67 } openbios_bd_t;
  68
  69 void *
  70 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
  71                 void *ign1, void *ign2)
  72 {
  73 #ifdef CONFIG_40x
  74         openbios_bd_t *openbios_bd = NULL;
  75         openbios_bd_t *(*get_board_info)(void) =
  76                 (openbios_bd_t *(*)(void))(*(unsigned long *)BOARD_INFO_VECTOR);
  77
  78         /*
  79          * On 40x platforms we not only need the MAC-addresses, but also the
  80          * clocks and memsize. Now try to get all values using the OpenBIOS
  81          * "get_board_info()" callback.
  82          */
  83         if ((openbios_bd = get_board_info()) != NULL) {
  84                 /*
  85                  * Copy bd_info from OpenBIOS struct into U-Boot struct
  86                  * used by kernel
  87                  */
  88                 hold_residual->bi_memsize = openbios_bd->bi_memsize;
  89                 hold_residual->bi_intfreq = openbios_bd->bi_intfreq;
  90                 hold_residual->bi_busfreq = openbios_bd->bi_busfreq;
  91                 hold_residual->bi_pci_busfreq = openbios_bd->bi_pci_busfreq;
  92                 memcpy(hold_residual->bi_pci_enetaddr, openbios_bd->bi_pci_enetaddr, 6);
  93 #ifdef CONFIG_405EP
  94                 memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr[0], 6);
  95                 memcpy(hold_residual->bi_enet1addr, openbios_bd->bi_enetaddr[1], 6);
  96                 hold_residual->bi_opbfreq = openbios_bd->bi_opb_busfreq;
  97                 hold_residual->bi_procfreq = openbios_bd->bi_pllouta_freq;
  98 #else /* CONFIG_405EP */
  99                 memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr, 6);
 100 #endif /* CONFIG_405EP */
 101         } else {
 102                 /* Hmmm...better try to stuff some defaults.
 103                  */
 104                 hold_residual->bi_memsize = 16 * 1024 * 1024;
 105                 hold_residual->bi_intfreq = 200000000;
 106                 hold_residual->bi_busfreq = 100000000;
 107                 hold_residual->bi_pci_busfreq = 66666666;
 108
 109                 /*
 110                  * Only supply one mac-address in this fallback
 111                  */
 112                 memcpy(hold_residual->bi_enetaddr, (void *)def_enet_addr, 6);
 113 #ifdef CONFIG_405EP
 114                 hold_residual->bi_opbfreq = 50000000;
 115                 hold_residual->bi_procfreq = 200000000;
 116 #endif /* CONFIG_405EP */
 117         }
 118
 119         timebase_period_ns = 1000000000 / hold_residual->bi_intfreq;
 120 #endif /* CONFIG_40x */
 121
 122 #ifdef CONFIG_440GP
 123         /* simply copy the MAC addresses */
 124         memcpy(hold_residual->bi_enetaddr,  (char *)OPENBIOS_MAC_BASE, 6);
 125         memcpy(hold_residual->bi_enet1addr, (char *)(OPENBIOS_MAC_BASE+OPENBIOS_MAC_OFFSET), 6);
 126 #endif /* CONFIG_440GP */
 127
 128         decompress_kernel(load_addr, num_words, cksum);
 129
 130         return (void *)hold_residual;
 131 }