arch/ppc/boot/simple/misc-ev64260.S

   1 /*
   2  * arch/ppc/boot/simple/misc-ev64260.S
   3  *
   4  * Host bridge init code for the Marvell/Galileo EV-64260-BP evaluation board
   5  * with a GT64260 onboard.
   6  *
   7  * Author: Mark Greer <mgreer@mvista.com>
   8  *
   9  * 2001 (c) MontaVista, Software, Inc.  This file is licensed under
  10  * the terms of the GNU General Public License version 2.  This program
  11  * is licensed "as is" without any warranty of any kind, whether express
  12  * or implied.
  13  */
  14
  15 #include <asm/ppc_asm.h>
  16 #include <asm/cache.h>
  17 #include <asm/gt64260_defs.h>
  18
  19 #include <platforms/ev64260.h>
  20
  21         .globl  ev64260_init
  22 ev64260_init:
  23         li      r20,0
  24         li      r23,20
  25
  26         /* Relocate galileo's regs */
  27         addis   r25,0,GT64260_INTERNAL_SPACE_DEFAULT_ADDR@h
  28         ori     r25,r25,GT64260_INTERNAL_SPACE_DECODE
  29         lwbrx   r26,0,(r25)
  30         lis     r24,0xffff
  31         and     r26,r26,r24
  32         addis   r24,0,EV64260_BRIDGE_REG_BASE@h
  33         srw     r24,r24,r23
  34         or      r26,r26,r24
  35         stwbrx  r26,0,(r25)
  36         sync
  37
  38         /* Wait for write to take effect */
  39         addis   r25,0,EV64260_BRIDGE_REG_BASE@h
  40         ori     r25,r25,GT64260_INTERNAL_SPACE_DECODE
  41 1:      lwbrx   r24,0,(r25)
  42         cmpw    r24,r26
  43         bne     1b
  44
  45         /* Change CS2 (UARTS on device module) window */
  46         addis   r25,0,EV64260_BRIDGE_REG_BASE@h
  47         ori     r25,r25,GT64260_CPU_CS_DECODE_2_BOT
  48         addis   r26,0,EV64260_UART_BASE@h
  49         srw     r26,r26,r23
  50         stwbrx  r26,0,(r25)
  51         sync
  52
  53         addis   r25,0,EV64260_BRIDGE_REG_BASE@h
  54         ori     r25,r25,GT64260_CPU_CS_DECODE_2_TOP
  55         addis   r26,0,EV64260_UART_END@h
  56         srw     r26,r26,r23
  57         stwbrx  r26,0,(r25)
  58         sync
  59
  60         blr