board/esd/pmc440/init.S

   1 /*
   2  *
   3  * See file CREDITS for list of people who contributed to this
   4  * project.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  19  * MA 02111-1307 USA
  20  */
  21
  22 #include <ppc_asm.tmpl>
  23 #include <asm-ppc/mmu.h>
  24 #include <config.h>
  25
  26 /**************************************************************************
  27  * TLB TABLE
  28  *
  29  * This table is used by the cpu boot code to setup the initial tlb
  30  * entries. Rather than make broad assumptions in the cpu source tree,
  31  * this table lets each board set things up however they like.
  32  *
  33  *  Pointer to the table is returned in r1
  34  *
  35  *************************************************************************/
  36     .section .bootpg,"ax"
  37     .globl tlbtab
  38
  39 tlbtab:
  40         tlbtab_start
  41
  42         /*
  43          * BOOT_CS (FLASH) must be first. Before relocation SA_I can be off to use the
  44          * speed up boot process. It is patched after relocation to enable SA_I
  45          */
  46 #ifndef CONFIG_NAND_SPL
  47         tlbentry( CONFIG_SYS_BOOT_BASE_ADDR, SZ_256M, CONFIG_SYS_BOOT_BASE_ADDR, 1, AC_R|AC_W|AC_X|SA_G )
  48 #else
  49         tlbentry( CONFIG_SYS_NAND_BOOT_SPL_SRC, SZ_4K, CONFIG_SYS_NAND_BOOT_SPL_SRC, 1, AC_R|AC_W|AC_X|SA_G )
  50 #endif
  51
  52         /* TLB-entry for DDR SDRAM (Up to 2GB) */
  53 #ifdef CONFIG_4xx_DCACHE
  54         tlbentry( CONFIG_SYS_SDRAM_BASE, SZ_256M, CONFIG_SYS_SDRAM_BASE, 0, AC_R|AC_W|AC_X|SA_G)
  55 #else
  56         tlbentry( CONFIG_SYS_SDRAM_BASE, SZ_256M, CONFIG_SYS_SDRAM_BASE, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
  57 #endif
  58
  59 #ifdef CONFIG_SYS_INIT_RAM_DCACHE
  60         /* TLB-entry for init-ram in dcache (SA_I must be turned off!) */
  61         tlbentry( CONFIG_SYS_INIT_RAM_ADDR, SZ_64K, CONFIG_SYS_INIT_RAM_ADDR, 0, AC_R|AC_W|AC_X|SA_G )
  62 #endif
  63
  64         /* TLB-entry for PCI Memory */
  65         tlbentry( CONFIG_SYS_PCI_MEMBASE, SZ_256M, CONFIG_SYS_PCI_MEMBASE, 1, AC_R|AC_W|SA_G|SA_I )
  66         tlbentry( CONFIG_SYS_PCI_MEMBASE1, SZ_256M, CONFIG_SYS_PCI_MEMBASE1, 1, AC_R|AC_W|SA_G|SA_I )
  67         tlbentry( CONFIG_SYS_PCI_MEMBASE2, SZ_256M, CONFIG_SYS_PCI_MEMBASE2, 1, AC_R|AC_W|SA_G|SA_I )
  68         tlbentry( CONFIG_SYS_PCI_MEMBASE3, SZ_256M, CONFIG_SYS_PCI_MEMBASE3, 1, AC_R|AC_W|SA_G|SA_I )
  69
  70         /* TLB-entries for EBC */
  71         /* PMC440 maps EBC to 0xef000000 which is handled by the peripheral
  72          * tlb entry.
  73          * This dummy entry is only for convinience in order not to modify the
  74          * amount of entries. Currently OS/9 relies on this :-)
  75          */
  76         tlbentry( 0xc0000000, SZ_256M, 0xc0000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I )
  77
  78         /* TLB-entry for NAND */
  79         tlbentry( CONFIG_SYS_NAND_ADDR, SZ_1K, CONFIG_SYS_NAND_ADDR, 1, AC_R|AC_W|AC_X|SA_G|SA_I )
  80
  81         /* TLB-entry for Internal Registers & OCM */
  82         tlbentry( 0xe0000000, SZ_16M, 0xe0000000, 0,  AC_R|AC_W|AC_X|SA_I )
  83
  84         /*TLB-entry PCI registers*/
  85         tlbentry( 0xEEC00000, SZ_1K, 0xEEC00000, 1,  AC_R|AC_W|AC_X|SA_G|SA_I )
  86
  87         /* TLB-entry for peripherals */
  88         tlbentry( 0xEF000000, SZ_16M, 0xEF000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I)
  89
  90         /* TLB-entry PCI IO space */
  91         tlbentry(0xE8000000, SZ_64K, 0xE8000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I)
  92
  93         /* TODO:  what about high IO space */
  94         tlbtab_end
  95
  96 #if defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
  97         /*
  98          * For NAND booting the first TLB has to be reconfigured to full size
  99          * and with caching disabled after running from RAM!
 100          */
 101 #define TLB00   TLB0(CONFIG_SYS_BOOT_BASE_ADDR, SZ_256M)
 102 #define TLB01   TLB1(CONFIG_SYS_BOOT_BASE_ADDR, 1)
 103 #define TLB02   TLB2(AC_R|AC_W|AC_X|SA_G|SA_I)
 104
 105         .globl  reconfig_tlb0
 106 reconfig_tlb0:
 107         sync
 108         isync
 109         addi    r4,r0,0x0000            /* TLB entry #0 */
 110         lis     r5,TLB00@h
 111         ori     r5,r5,TLB00@l
 112         tlbwe   r5,r4,0x0000            /* Save it out */
 113         lis     r5,TLB01@h
 114         ori     r5,r5,TLB01@l
 115         tlbwe   r5,r4,0x0001            /* Save it out */
 116         lis     r5,TLB02@h
 117         ori     r5,r5,TLB02@l
 118         tlbwe   r5,r4,0x0002            /* Save it out */
 119         sync
 120         isync
 121         blr
 122 #endif