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

   1 /*
   2  * Relocate bridge's register base and call board specific routine.
   3  *
   4  * Author: Mark A. Greer <source@mvista.com>
   5  *
   6  * 2005 (c) MontaVista Software, Inc. This file is licensed under
   7  * the terms of the GNU General Public License version 2. This program
   8  * is licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  */
  11
  12 #include <linux/types.h>
  13 #include <asm/io.h>
  14 #include <asm/mv64x60_defs.h>
  15
  16 extern struct bi_record *decompress_kernel(unsigned long load_addr,
  17         int num_words, unsigned long cksum);
  18
  19
  20 u32 size_reg[MV64x60_CPU2MEM_WINDOWS] = {
  21         MV64x60_CPU2MEM_0_SIZE, MV64x60_CPU2MEM_1_SIZE,
  22         MV64x60_CPU2MEM_2_SIZE, MV64x60_CPU2MEM_3_SIZE
  23 };
  24
  25 /* Read mem ctlr to get the amount of mem in system */
  26 unsigned long
  27 mv64360_get_mem_size(void)
  28 {
  29         u32     enables, i, v;
  30         u32     mem = 0;
  31
  32         enables = in_le32((void __iomem *)CONFIG_MV64X60_NEW_BASE +
  33                 MV64360_CPU_BAR_ENABLE) & 0xf;
  34
  35         for (i=0; i<MV64x60_CPU2MEM_WINDOWS; i++)
  36                 if (!(enables & (1<<i))) {
  37                         v = in_le32((void __iomem *)CONFIG_MV64X60_NEW_BASE
  38                                 + size_reg[i]) & 0xffff;
  39                         v = (v + 1) << 16;
  40                         mem += v;
  41                 }
  42
  43         return mem;
  44 }
  45
  46 void
  47 mv64x60_move_base(void __iomem *old_base, void __iomem *new_base)
  48 {
  49         u32     bits, mask, b;
  50
  51         if (old_base != new_base) {
  52 #ifdef CONFIG_GT64260
  53                 bits = 12;
  54                 mask = 0x07000000;
  55 #else /* Must be mv64[34]60 */
  56                 bits = 16;
  57                 mask = 0x03000000;
  58 #endif
  59                 b = in_le32(old_base + MV64x60_INTERNAL_SPACE_DECODE);
  60                 b &= mask;
  61                 b |= ((u32)new_base >> (32 - bits));
  62                 out_le32(old_base + MV64x60_INTERNAL_SPACE_DECODE, b);
  63
  64                 __asm__ __volatile__("sync");
  65
  66                 /* Wait for change to happen (in accordance with the manual) */
  67                 while (in_le32(new_base + MV64x60_INTERNAL_SPACE_DECODE) != b);
  68         }
  69 }
  70
  71 void __attribute__ ((weak))
  72 mv64x60_board_init(void __iomem *old_base, void __iomem *new_base)
  73 {
  74 }
  75
  76 void *
  77 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
  78                 void *ign1, void *ign2)
  79 {
  80         mv64x60_move_base((void __iomem *)CONFIG_MV64X60_BASE,
  81                 (void __iomem *)CONFIG_MV64X60_NEW_BASE);
  82         mv64x60_board_init((void __iomem *)CONFIG_MV64X60_BASE,
  83                 (void __iomem *)CONFIG_MV64X60_NEW_BASE);
  84         return decompress_kernel(load_addr, num_words, cksum);
  85 }