Initial revision
authorwdenk <wdenk>
Tue, 16 Jul 2002 18:49:25 +0000 (18:49 +0000)
committerwdenk <wdenk>
Tue, 16 Jul 2002 18:49:25 +0000 (18:49 +0000)
board/mpl/pip405/init.S [new file with mode: 0644]

diff --git a/board/mpl/pip405/init.S b/board/mpl/pip405/init.S
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+/*------------------------------------------------------------------------------+
+ *
+ *      This source code has been made available to you by IBM on an AS-IS
+ *      basis.  Anyone receiving this source is licensed under IBM
+ *      copyrights to use it in any way he or she deems fit, including
+ *      copying it, modifying it, compiling it, and redistributing it either
+ *      with or without modifications.  No license under IBM patents or
+ *      patent applications is to be implied by the copyright license.
+ *
+ *      Any user of this software should understand that IBM cannot provide
+ *      technical support for this software and will not be responsible for
+ *      any consequences resulting from the use of this software.
+ *
+ *      Any person who transfers this source code or any derivative work
+ *      must include the IBM copyright notice, this paragraph, and the
+ *      preceding two paragraphs in the transferred software.
+ *
+ *      COPYRIGHT   I B M   CORPORATION 1995
+ *      LICENSED MATERIAL  -  PROGRAM PROPERTY OF I B M
+ *-------------------------------------------------------------------------------*/
+
+/*-----------------------------------------------------------------------------
+ * Function:     ext_bus_cntlr_init
+ * Description:  Initializes the External Bus Controller for the external
+ *             peripherals. IMPORTANT: For pass1 this code must run from
+ *             cache since you can not reliably change a peripheral banks
+ *             timing register (pbxap) while running code from that bank.
+ *             For ex., since we are running from ROM on bank 0, we can NOT
+ *             execute the code that modifies bank 0 timings from ROM, so
+ *             we run it from cache.
+ *     Bank 0 - Flash or Multi Purpose Socket
+ *     Bank 1 - Multi Purpose Socket or Flash
+ *     Bank 2 - not used
+ *     Bank 3 - not used
+ *     Bank 4 - not used
+ *     Bank 5 - not used
+ *     Bank 6 - used to switch on the 12V for the Multipurpose socket
+ *     Bank 7 - Config Register
+ *-----------------------------------------------------------------------------*/
+#include <ppc4xx.h>
+
+#define _LINUX_CONFIG_H 1      /* avoid reading Linux autoconf.h file  */
+
+#include "configs/PIP405.h"
+#include <ppc_asm.tmpl>
+#include <ppc_defs.h>
+
+#include <asm/cache.h>
+#include <asm/mmu.h>
+
+
+       .globl  ext_bus_cntlr_init
+ext_bus_cntlr_init:
+  mflr    r4                      /* save link register */
+  bl      ..getAddr
+..getAddr:
+  mflr    r3                      /* get address of ..getAddr */
+  mtlr    r4                      /* restore link register */
+  addi    r4,0,14                 /* set ctr to 14; used to prefetch */
+  mtctr   r4                      /* 14 cache lines to fit this function */
+                                   /* in cache (gives us 8x14=112 instrctns) */
+..ebcloop:
+  icbt    r0,r3                   /* prefetch cache line for addr in r3 */
+  addi    r3,r3,32                                                             /* move to next cache line */
+  bdnz    ..ebcloop               /* continue for 14 cache lines */
+
+   /*-------------------------------------------------------------------
+    * Delay to ensure all accesses to ROM are complete before changing
+    * bank 0 timings.
+    *------------------------------------------------------------------- */
+       addis   r3,0,0x0
+  ori     r3,r3,0xA000
+  mtctr   r3
+..spinlp:
+  bdnz    ..spinlp                /* spin loop */
+
+       /*-----------------------------------------------------------------------
+        * decide boot up mode
+        *----------------------------------------------------------------------- */
+       addi            r4,0,pb0cr
+       mtdcr           ebccfga,r4
+       mfdcr           r4,ebccfgd
+
+       andi.           r0, r4, 0x2000                  /* mask out irrelevant bits */
+       beq                     0f                                                                      /* jump if 8 bit bus width */
+
+       /* setup 16 bit things
+   *-----------------------------------------------------------------------
+   * Memory Bank 0 (16 Bit Flash) initialization
+   *---------------------------------------------------------------------- */
+
+       addi    r4,0,pb0ap
+  mtdcr   ebccfga,r4
+  addis   r4,0,0x9B01
+  ori     r4,r4,0x5480
+  mtdcr   ebccfgd,r4
+
+  addi    r4,0,pb0cr
+  mtdcr   ebccfga,r4
+       /* BS=0x011(8MB),BU=0x3(R/W), */
+  addis   r4,0,((FLASH_BASE0_PRELIM & 0xFFF00000) | 0x00050000)@h
+  ori     r4,r4,0xA000          /* BW=0x01(16 bits) */
+  mtdcr   ebccfgd,r4
+
+  /*-----------------------------------------------------------------------
+   * Memory Bank 1 (Multi Purpose Socket) initialization
+   *----------------------------------------------------------------------*/
+  addi    r4,0,pb1ap
+  mtdcr   ebccfga,r4
+  addis   r4,0,0x0281
+  ori     r4,r4,0x5480
+  mtdcr   ebccfgd,r4
+
+  addi    r4,0,pb1cr
+  mtdcr   ebccfga,r4
+  /* BS=0x011(8MB),BU=0x3(R/W), */
+  addis   r4,0,((MULTI_PURPOSE_SOCKET_ADDR & 0xFFF00000) | 0x00050000)@h
+  ori     r4,r4,0x8000          /* BW=0x0( 8 bits) */
+  mtdcr   ebccfgd,r4
+       b                               1f
+
+0:
+  /* 8Bit boot mode: */
+       /*-----------------------------------------------------------------------
+   * Memory Bank 0 Multi Purpose Socket initialization
+   *----------------------------------------------------------------------- */
+
+       addi    r4,0,pb0ap
+  mtdcr   ebccfga,r4
+  addis   r4,0,0x9B01
+  ori     r4,r4,0x5480
+  mtdcr   ebccfgd,r4
+
+  addi    r4,0,pb0cr
+  mtdcr   ebccfga,r4
+       /* BS=0x011(4MB),BU=0x3(R/W), */
+  addis   r4,0,((FLASH_BASE0_PRELIM & 0xFFF00000) | 0x00050000)@h
+  ori     r4,r4,0x8000          /* BW=0x0( 8 bits) */
+  mtdcr   ebccfgd,r4
+
+  /*-----------------------------------------------------------------------
+   * Memory Bank 1 (Flash) initialization
+   *-----------------------------------------------------------------------*/
+  addi    r4,0,pb1ap
+  mtdcr   ebccfga,r4
+  addis   r4,0,0x0281
+  ori     r4,r4,0x5480
+  mtdcr   ebccfgd,r4
+
+  addi    r4,0,pb1cr
+  mtdcr   ebccfga,r4
+  /* BS=0x011(8MB),BU=0x3(R/W), */
+  addis   r4,0,((MULTI_PURPOSE_SOCKET_ADDR & 0xFFF00000) | 0x00050000)@h
+  ori     r4,r4,0xA000          /* BW=0x0( 8 bits) */
+  mtdcr   ebccfgd,r4
+
+1:
+  /*-----------------------------------------------------------------------
+   * Memory Bank 2-3-4-5-6 (not used) initialization
+   *-----------------------------------------------------------------------*/
+  addi    r4,0,pb2cr
+  mtdcr   ebccfga,r4
+  addis   r4,0,0x0000
+  ori     r4,r4,0x0000
+  mtdcr   ebccfgd,r4
+
+  addi    r4,0,pb3cr
+  mtdcr   ebccfga,r4
+  addis   r4,0,0x0000
+  ori     r4,r4,0x0000
+  mtdcr   ebccfgd,r4
+
+  addi    r4,0,pb4cr
+  mtdcr   ebccfga,r4
+  addis   r4,0,0x0000
+  ori     r4,r4,0x0000
+  mtdcr   ebccfgd,r4
+
+  addi    r4,0,pb5cr
+  mtdcr   ebccfga,r4
+  addis   r4,0,0x0000
+  ori     r4,r4,0x0000
+  mtdcr   ebccfgd,r4
+
+       addi    r4,0,pb6cr
+  mtdcr   ebccfga,r4
+  addis   r4,0,0x0000
+  ori     r4,r4,0x0000
+  mtdcr   ebccfgd,r4
+
+       /*-----------------------------------------------------------------------
+   * Memory Bank 7 (Config Register) initialization
+   *----------------------------------------------------------------------- */
+  addi    r4,0,pb7ap
+  mtdcr   ebccfga,r4
+  addis   r4,0,0x0181        /* Doc says TWT=3 and Openios TWT=3!! */
+  ori     r4,r4,0x5280          /* disable Ready, BEM=0 */
+  mtdcr   ebccfgd,r4
+
+  addi    r4,0,pb7cr
+  mtdcr   ebccfga,r4
+       /* BS=0x0(1MB),BU=0x3(R/W), */
+  addis   r4,0,((CONFIG_PORT_ADDR & 0xFFF00000) | 0x00010000)@h
+  ori     r4,r4,0x8000            /* BW=0x0(8 bits) */
+  mtdcr   ebccfgd,r4
+       nop                             /* pass2 DCR errata #8 */
+  blr
+
+/*-----------------------------------------------------------------------------
+ * Function:     sdram_init
+ * Description:  Configures the internal SRAM memory. and setup the
+ *               Stackpointer in it.
+ *----------------------------------------------------------------------------- */
+        .globl  sdram_init
+
+sdram_init:
+
+
+  blr
+