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/*
* (C) Copyright 2007-2008
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
* Based on code provided from Senao and AMCC
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <config.h>
#include <ppc4xx.h>
#include <ppc_asm.tmpl>
#include <ppc_defs.h>
#define mtsdram_as(reg, value) \
addi r4,0,reg ; \
mtdcr memcfga,r4 ; \
addis r4,0,value@h ; \
ori r4,r4,value@l ; \
mtdcr memcfgd,r4 ;
.globl ext_bus_cntlr_init
ext_bus_cntlr_init:
/*
* DDR2 setup
*/
/* Following the DDR Core Manual, here is the initialization */
/* Step 1 */
/* Step 2 */
/* Step 3 */
/* base=00000000, size=128MByte (5), mode=2 (n*10*4) */
mtsdram_as(SDRAM_MB0CF, 0x00005201);
/* base=08000000, size=128MByte (5), mode=2 (n*10*4) */
mtsdram_as(SDRAM_MB1CF, (0x08000000 >> 3) | 0x5201);
/* SDRAM_CLKTR: Adv Addr clock by 180 deg */
mtsdram_as(SDRAM_CLKTR,0x80000000);
/* Refresh Time register (0x30) Refresh every 7.8125uS */
mtsdram_as(SDRAM_RTR, 0x06180000);
/* SDRAM_SDTR1 */
mtsdram_as(SDRAM_SDTR1, 0x80201000);
/* SDRAM_SDTR2 */
mtsdram_as(SDRAM_SDTR2, 0x32204232);
/* SDRAM_SDTR3 */
mtsdram_as(SDRAM_SDTR3, 0x080b0d1a);
mtsdram_as(SDRAM_MMODE, 0x00000442);
mtsdram_as(SDRAM_MEMODE, 0x00000404);
/* SDRAM0_MCOPT1 (0X20) No ECC Gen */
mtsdram_as(SDRAM_MCOPT1, 0x04322000);
/* NOP */
mtsdram_as(SDRAM_INITPLR0, 0xa8380000);
/* precharge 3 DDR clock cycle */
mtsdram_as(SDRAM_INITPLR1, 0x81900400);
/* EMR2 twr = 2tck */
mtsdram_as(SDRAM_INITPLR2, 0x81020000);
/* EMR3 twr = 2tck */
mtsdram_as(SDRAM_INITPLR3, 0x81030000);
/* EMR DLL ENABLE twr = 2tck */
mtsdram_as(SDRAM_INITPLR4, 0x81010404);
/* MR w/ DLL reset
* Note: 5 is CL. May need to be changed
*/
mtsdram_as(SDRAM_INITPLR5, 0x81000542);
/* precharge 3 DDR clock cycle */
mtsdram_as(SDRAM_INITPLR6, 0x81900400);
/* Auto-refresh trfc = 26tck */
mtsdram_as(SDRAM_INITPLR7, 0x8D080000);
/* Auto-refresh trfc = 26tck */
mtsdram_as(SDRAM_INITPLR8, 0x8D080000);
/* Auto-refresh */
mtsdram_as(SDRAM_INITPLR9, 0x8D080000);
/* Auto-refresh */
mtsdram_as(SDRAM_INITPLR10, 0x8D080000);
/* MRS - normal operation; wait 2 cycle (set wait to tMRD) */
mtsdram_as(SDRAM_INITPLR11, 0x81000442);
mtsdram_as(SDRAM_INITPLR12, 0x81010780);
mtsdram_as(SDRAM_INITPLR13, 0x81010400);
mtsdram_as(SDRAM_INITPLR14, 0x00000000);
mtsdram_as(SDRAM_INITPLR15, 0x00000000);
/* SET MCIF0_CODT Die Termination On */
mtsdram_as(SDRAM_CODT, 0x0080f837);
mtsdram_as(SDRAM_MODT0, 0x01800000);
#if 0 /* test-only: not sure if 0 is ok when 2nd bank is used */
mtsdram_as(SDRAM_MODT1, 0x00000000);
#endif
mtsdram_as(SDRAM_WRDTR, 0x00000000);
/* SDRAM0_MCOPT2 (0X21) Start initialization */
mtsdram_as(SDRAM_MCOPT2, 0x20000000);
/* Step 5 */
lis r3,0x1 /* 400000 = wait 100ms */
mtctr r3
pll_wait:
bdnz pll_wait
/* Step 6 */
/* SDRAM_DLCR */
mtsdram_as(SDRAM_DLCR, 0x030000a5);
/* SDRAM_RDCC */
mtsdram_as(SDRAM_RDCC, 0x40000000);
/* SDRAM_RQDC */
mtsdram_as(SDRAM_RQDC, 0x80000038);
/* SDRAM_RFDC */
mtsdram_as(SDRAM_RFDC, 0x00000209);
/* Enable memory controller */
mtsdram_as(SDRAM_MCOPT2, 0x28000000);
blr
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