arch/ppc/boot/simple/misc-mv64x60.c

   1 /*
   2  * arch/ppc/boot/simple/misc-mv64x60.c
   3  *
   4  * Relocate bridge's register base and call board specific routine.
   5  *
   6  * Author: Mark A. Greer <source@mvista.com>
   7  *
   8  * 2005 (c) MontaVista Software, Inc. This file is licensed under
   9  * the terms of the GNU General Public License version 2. This program
  10  * is licensed "as is" without any warranty of any kind, whether express
  11  * or implied.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/types.h>
  16 #include <asm/io.h>
  17 #include <asm/mv64x60_defs.h>
  18
  19 extern struct bi_record *decompress_kernel(unsigned long load_addr,
  20         int num_words, unsigned long cksum);
  21
  22 void
  23 mv64x60_move_base(void __iomem *old_base, void __iomem *new_base)
  24 {
  25         u32     bits, mask, b;
  26
  27         if (old_base != new_base) {
  28 #ifdef CONFIG_GT64260
  29                 bits = 12;
  30                 mask = 0x07000000;
  31 #else /* Must be mv64[34]60 */
  32                 bits = 16;
  33                 mask = 0x03000000;
  34 #endif
  35                 b = in_le32(old_base + MV64x60_INTERNAL_SPACE_DECODE);
  36                 b &= mask;
  37                 b |= ((u32)new_base >> (32 - bits));
  38                 out_le32(old_base + MV64x60_INTERNAL_SPACE_DECODE, b);
  39
  40                 __asm__ __volatile__("sync");
  41
  42                 /* Wait for change to happen (in accordance with the manual) */
  43                 while (in_le32(new_base + MV64x60_INTERNAL_SPACE_DECODE) != b);
  44         }
  45 }
  46
  47 void __attribute__ ((weak))
  48 mv64x60_board_init(void __iomem *old_base, void __iomem *new_base)
  49 {
  50 }
  51
  52 void *
  53 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
  54                 void *ign1, void *ign2)
  55 {
  56         mv64x60_move_base((void __iomem *)CONFIG_MV64X60_BASE,
  57                 (void __iomem *)CONFIG_MV64X60_NEW_BASE);
  58         mv64x60_board_init((void __iomem *)CONFIG_MV64X60_BASE,
  59                 (void __iomem *)CONFIG_MV64X60_NEW_BASE);
  60         return decompress_kernel(load_addr, num_words, cksum);
  61 }