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c821b5f120
This patch (Part 1 of 2):
* Rolls up a suite of changes to enable correct primordial stack and
global data handling when the data cache is used for such a purpose
for PPC40x-variants (i.e. CFG_INIT_DCACHE_CS).
* Related to the first, unifies DDR2 SDRAM and ECC initialization by
eliminating redundant ECC initialization implementations and moving
redundant SDRAM initialization out of board code into shared 4xx
code.
* Enables MCSR visibility on the 405EX(r).
* Enables the use of the data cache for initial RAM on
both AMCC's Kilauea and Makalu and removes a redundant
CFG_POST_MEMORY flag from each board's CONFIG_POST value.
- Removed, per Stefan Roese's request, defunct memory.c file for
Makalu and rolled sdram_init from it into makalu.c.
With respect to the 4xx DDR initialization and ECC unification, there
is certainly more work that can and should be done (file renaming,
etc.). However, that can be handled at a later date on a second or
third pass. As it stands, this patch moves things forward in an
incremental yet positive way for those platforms that utilize this
code and the features associated with it.
Signed-off-by: Grant Erickson <gerickson@nuovations.com>
Signed-off-by: Stefan Roese <sr@denx.de>
411 lines
10 KiB
C
411 lines
10 KiB
C
/*
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* (C) Copyright 2005-2007
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* Stefan Roese, DENX Software Engineering, sr@denx.de.
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*
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* (C) Copyright 2006
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* DAVE Srl <www.dave-tech.it>
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*
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* (C) Copyright 2002-2004
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* Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <ppc4xx.h>
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#include <asm/processor.h>
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#include "sdram.h"
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#include "ecc.h"
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#ifdef CONFIG_SDRAM_BANK0
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#ifndef CONFIG_440
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#ifndef CFG_SDRAM_TABLE
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sdram_conf_t mb0cf[] = {
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{(128 << 20), 13, 0x000A4001}, /* (0-128MB) Address Mode 3, 13x10(4) */
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{(64 << 20), 13, 0x00084001}, /* (0-64MB) Address Mode 3, 13x9(4) */
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{(32 << 20), 12, 0x00062001}, /* (0-32MB) Address Mode 2, 12x9(4) */
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{(16 << 20), 12, 0x00046001}, /* (0-16MB) Address Mode 4, 12x8(4) */
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{(4 << 20), 11, 0x00008001}, /* (0-4MB) Address Mode 5, 11x8(2) */
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};
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#else
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sdram_conf_t mb0cf[] = CFG_SDRAM_TABLE;
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#endif
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#define N_MB0CF (sizeof(mb0cf) / sizeof(mb0cf[0]))
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#ifdef CFG_SDRAM_CASL
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static ulong ns2clks(ulong ns)
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{
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ulong bus_period_x_10 = ONE_BILLION / (get_bus_freq(0) / 10);
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return ((ns * 10) + bus_period_x_10) / bus_period_x_10;
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}
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#endif /* CFG_SDRAM_CASL */
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static ulong compute_sdtr1(ulong speed)
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{
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#ifdef CFG_SDRAM_CASL
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ulong tmp;
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ulong sdtr1 = 0;
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/* CASL */
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if (CFG_SDRAM_CASL < 2)
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sdtr1 |= (1 << SDRAM0_TR_CASL);
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else
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if (CFG_SDRAM_CASL > 4)
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sdtr1 |= (3 << SDRAM0_TR_CASL);
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else
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sdtr1 |= ((CFG_SDRAM_CASL-1) << SDRAM0_TR_CASL);
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/* PTA */
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tmp = ns2clks(CFG_SDRAM_PTA);
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if ((tmp >= 2) && (tmp <= 4))
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sdtr1 |= ((tmp-1) << SDRAM0_TR_PTA);
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else
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sdtr1 |= ((4-1) << SDRAM0_TR_PTA);
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/* CTP */
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tmp = ns2clks(CFG_SDRAM_CTP);
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if ((tmp >= 2) && (tmp <= 4))
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sdtr1 |= ((tmp-1) << SDRAM0_TR_CTP);
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else
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sdtr1 |= ((4-1) << SDRAM0_TR_CTP);
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/* LDF */
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tmp = ns2clks(CFG_SDRAM_LDF);
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if ((tmp >= 2) && (tmp <= 4))
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sdtr1 |= ((tmp-1) << SDRAM0_TR_LDF);
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else
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sdtr1 |= ((2-1) << SDRAM0_TR_LDF);
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/* RFTA */
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tmp = ns2clks(CFG_SDRAM_RFTA);
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if ((tmp >= 4) && (tmp <= 10))
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sdtr1 |= ((tmp-4) << SDRAM0_TR_RFTA);
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else
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sdtr1 |= ((10-4) << SDRAM0_TR_RFTA);
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/* RCD */
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tmp = ns2clks(CFG_SDRAM_RCD);
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if ((tmp >= 2) && (tmp <= 4))
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sdtr1 |= ((tmp-1) << SDRAM0_TR_RCD);
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else
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sdtr1 |= ((4-1) << SDRAM0_TR_RCD);
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return sdtr1;
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#else /* CFG_SDRAM_CASL */
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/*
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* If no values are configured in the board config file
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* use the default values, which seem to be ok for most
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* boards.
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*
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* REMARK:
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* For new board ports we strongly recommend to define the
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* correct values for the used SDRAM chips in your board
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* config file (see PPChameleonEVB.h)
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*/
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if (speed > 100000000) {
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/*
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* 133 MHz SDRAM
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*/
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return 0x01074015;
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} else {
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/*
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* default: 100 MHz SDRAM
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*/
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return 0x0086400d;
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}
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#endif /* CFG_SDRAM_CASL */
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}
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/* refresh is expressed in ms */
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static ulong compute_rtr(ulong speed, ulong rows, ulong refresh)
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{
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#ifdef CFG_SDRAM_CASL
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ulong tmp;
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tmp = ((refresh*1000*1000) / (1 << rows)) * (speed / 1000);
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tmp /= 1000000;
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return ((tmp & 0x00003FF8) << 16);
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#else /* CFG_SDRAM_CASL */
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if (speed > 100000000) {
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/*
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* 133 MHz SDRAM
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*/
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return 0x07f00000;
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} else {
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/*
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* default: 100 MHz SDRAM
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*/
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return 0x05f00000;
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}
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#endif /* CFG_SDRAM_CASL */
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}
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/*
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* Autodetect onboard SDRAM on 405 platforms
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*/
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void sdram_init(void)
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{
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ulong speed;
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ulong sdtr1;
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int i;
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/*
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* Determine SDRAM speed
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*/
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speed = get_bus_freq(0); /* parameter not used on ppc4xx */
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/*
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* sdtr1 (register SDRAM0_TR) must take into account timings listed
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* in SDRAM chip datasheet. rtr (register SDRAM0_RTR) must take into
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* account actual SDRAM size. So we can set up sdtr1 according to what
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* is specified in board configuration file while rtr dependds on SDRAM
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* size we are assuming before detection.
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*/
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sdtr1 = compute_sdtr1(speed);
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for (i=0; i<N_MB0CF; i++) {
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/*
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* Disable memory controller.
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*/
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mtsdram(mem_mcopt1, 0x00000000);
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/*
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* Set MB0CF for bank 0.
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*/
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mtsdram(mem_mb0cf, mb0cf[i].reg);
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mtsdram(mem_sdtr1, sdtr1);
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mtsdram(mem_rtr, compute_rtr(speed, mb0cf[i].rows, 64));
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udelay(200);
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/*
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* Set memory controller options reg, MCOPT1.
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* Set DC_EN to '1' and BRD_PRF to '01' for 16 byte PLB Burst
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* read/prefetch.
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*/
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mtsdram(mem_mcopt1, 0x80800000);
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udelay(10000);
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if (get_ram_size(0, mb0cf[i].size) == mb0cf[i].size) {
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/*
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* OK, size detected. Enable second bank if
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* defined (assumes same type as bank 0)
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*/
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#ifdef CONFIG_SDRAM_BANK1
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u32 b1cr = mb0cf[i].size | mb0cf[i].reg;
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mtsdram(mem_mcopt1, 0x00000000);
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mtsdram(mem_mb1cf, b1cr); /* SDRAM0_B1CR */
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mtsdram(mem_mcopt1, 0x80800000);
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udelay(10000);
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/*
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* Check if 2nd bank is really available.
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* If the size not equal to the size of the first
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* bank, then disable the 2nd bank completely.
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*/
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if (get_ram_size((long *)mb0cf[i].size, mb0cf[i].size) !=
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mb0cf[i].size) {
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mtsdram(mem_mb1cf, 0);
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mtsdram(mem_mcopt1, 0);
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}
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#endif
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return;
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}
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}
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}
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#else /* CONFIG_440 */
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/*
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* Define some default values. Those can be overwritten in the
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* board config file.
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*/
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#ifndef CFG_SDRAM_TABLE
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sdram_conf_t mb0cf[] = {
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{(256 << 20), 13, 0x000C4001}, /* 256MB mode 3, 13x10(4) */
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{(64 << 20), 12, 0x00082001} /* 64MB mode 2, 12x9(4) */
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};
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#else
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sdram_conf_t mb0cf[] = CFG_SDRAM_TABLE;
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#endif
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#ifndef CFG_SDRAM0_TR0
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#define CFG_SDRAM0_TR0 0x41094012
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#endif
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#define N_MB0CF (sizeof(mb0cf) / sizeof(mb0cf[0]))
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#define NUM_TRIES 64
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#define NUM_READS 10
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static void sdram_tr1_set(int ram_address, int* tr1_value)
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{
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int i;
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int j, k;
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volatile unsigned int* ram_pointer = (unsigned int *)ram_address;
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int first_good = -1, last_bad = 0x1ff;
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unsigned long test[NUM_TRIES] = {
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0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
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0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
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0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
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0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
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0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
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0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
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0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
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0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
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0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
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0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
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0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
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0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
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0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
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0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
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0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
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0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55 };
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/* go through all possible SDRAM0_TR1[RDCT] values */
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for (i=0; i<=0x1ff; i++) {
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/* set the current value for TR1 */
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mtsdram(mem_tr1, (0x80800800 | i));
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/* write values */
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for (j=0; j<NUM_TRIES; j++) {
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ram_pointer[j] = test[j];
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/* clear any cache at ram location */
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__asm__("dcbf 0,%0": :"r" (&ram_pointer[j]));
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}
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/* read values back */
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for (j=0; j<NUM_TRIES; j++) {
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for (k=0; k<NUM_READS; k++) {
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/* clear any cache at ram location */
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__asm__("dcbf 0,%0": :"r" (&ram_pointer[j]));
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if (ram_pointer[j] != test[j])
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break;
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}
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/* read error */
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if (k != NUM_READS)
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break;
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}
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/* we have a SDRAM0_TR1[RDCT] that is part of the window */
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if (j == NUM_TRIES) {
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if (first_good == -1)
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first_good = i; /* found beginning of window */
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} else { /* bad read */
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/* if we have not had a good read then don't care */
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if (first_good != -1) {
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/* first failure after a good read */
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last_bad = i-1;
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break;
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}
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}
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}
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/* return the current value for TR1 */
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*tr1_value = (first_good + last_bad) / 2;
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}
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/*
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* Autodetect onboard DDR SDRAM on 440 platforms
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*
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* NOTE: Some of the hardcoded values are hardware dependant,
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* so this should be extended for other future boards
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* using this routine!
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*/
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long int initdram(int board_type)
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{
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int i;
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int tr1_bank1;
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#if defined(CONFIG_440GX) || defined(CONFIG_440EP) || \
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defined(CONFIG_440GR) || defined(CONFIG_440SP)
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/*
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* Soft-reset SDRAM controller.
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*/
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mtsdr(sdr_srst, SDR0_SRST_DMC);
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mtsdr(sdr_srst, 0x00000000);
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#endif
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for (i=0; i<N_MB0CF; i++) {
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/*
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* Disable memory controller.
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*/
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mtsdram(mem_cfg0, 0x00000000);
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/*
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* Setup some default
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*/
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mtsdram(mem_uabba, 0x00000000); /* ubba=0 (default) */
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mtsdram(mem_slio, 0x00000000); /* rdre=0 wrre=0 rarw=0 */
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mtsdram(mem_devopt, 0x00000000); /* dll=0 ds=0 (normal) */
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mtsdram(mem_wddctr, 0x00000000); /* wrcp=0 dcd=0 */
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mtsdram(mem_clktr, 0x40000000); /* clkp=1 (90 deg wr) dcdt=0 */
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/*
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* Following for CAS Latency = 2.5 @ 133 MHz PLB
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*/
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mtsdram(mem_b0cr, mb0cf[i].reg);
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mtsdram(mem_tr0, CFG_SDRAM0_TR0);
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mtsdram(mem_tr1, 0x80800800); /* SS=T2 SL=STAGE 3 CD=1 CT=0x00*/
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mtsdram(mem_rtr, 0x04100000); /* Interval 7.8<EFBFBD>s @ 133MHz PLB */
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mtsdram(mem_cfg1, 0x00000000); /* Self-refresh exit, disable PM*/
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udelay(400); /* Delay 200 usecs (min) */
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/*
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* Enable the controller, then wait for DCEN to complete
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*/
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mtsdram(mem_cfg0, 0x82000000); /* DCEN=1, PMUD=0, 64-bit */
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udelay(10000);
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if (get_ram_size(0, mb0cf[i].size) == mb0cf[i].size) {
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/*
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* Optimize TR1 to current hardware environment
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*/
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sdram_tr1_set(0x00000000, &tr1_bank1);
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mtsdram(mem_tr1, (tr1_bank1 | 0x80800800));
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#ifdef CONFIG_SDRAM_ECC
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ecc_init(0, mb0cf[i].size);
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#endif
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/*
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* OK, size detected -> all done
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*/
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return mb0cf[i].size;
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}
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}
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return 0; /* nothing found ! */
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}
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#endif /* CONFIG_440 */
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#endif /* CONFIG_SDRAM_BANK0 */
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