+/*------------------------------------------------------------------------------+
+ *
+ * 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
+
projects / platform / kernel / u-boot.git / commitdiff