147 lines
3.3 KiB
C
147 lines
3.3 KiB
C
/*
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* linux/arch/mips/tx4927/common/tx4927_prom.c
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*
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* common tx4927 memory interface
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*
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* Author: MontaVista Software, Inc.
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* source@mvista.com
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*
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* Copyright 2001-2002 MontaVista Software Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/bootmem.h>
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#include <asm/addrspace.h>
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#include <asm/bootinfo.h>
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#include <asm/tx4927/tx4927.h>
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static unsigned int __init tx4927_process_sdccr(u64 * addr)
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{
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u64 val;
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unsigned int sdccr_ce;
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unsigned int sdccr_bs;
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unsigned int sdccr_rs;
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unsigned int sdccr_cs;
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unsigned int sdccr_mw;
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unsigned int bs = 0;
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unsigned int rs = 0;
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unsigned int cs = 0;
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unsigned int mw = 0;
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unsigned int msize = 0;
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val = (*((vu64 *) (addr)));
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/* MVMCP -- need #defs for these bits masks */
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sdccr_ce = ((val & (1 << 10)) >> 10);
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sdccr_bs = ((val & (1 << 8)) >> 8);
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sdccr_rs = ((val & (3 << 5)) >> 5);
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sdccr_cs = ((val & (3 << 2)) >> 2);
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sdccr_mw = ((val & (1 << 0)) >> 0);
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if (sdccr_ce) {
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switch (sdccr_bs) {
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case 0:{
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bs = 2;
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break;
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}
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case 1:{
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bs = 4;
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break;
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}
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}
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switch (sdccr_rs) {
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case 0:{
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rs = 2048;
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break;
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}
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case 1:{
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rs = 4096;
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break;
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}
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case 2:{
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rs = 8192;
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break;
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}
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case 3:{
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rs = 0;
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break;
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}
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}
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switch (sdccr_cs) {
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case 0:{
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cs = 256;
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break;
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}
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case 1:{
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cs = 512;
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break;
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}
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case 2:{
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cs = 1024;
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break;
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}
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case 3:{
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cs = 2048;
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break;
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}
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}
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switch (sdccr_mw) {
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case 0:{
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mw = 8;
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break;
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} /* 8 bytes = 64 bits */
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case 1:{
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mw = 4;
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break;
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} /* 4 bytes = 32 bits */
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}
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}
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/* bytes per chip MB per chip num chips */
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msize = (((rs * cs * mw) / (1024 * 1024)) * bs);
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return (msize);
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}
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unsigned int __init tx4927_get_mem_size(void)
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{
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unsigned int c0;
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unsigned int c1;
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unsigned int c2;
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unsigned int c3;
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unsigned int total;
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/* MVMCP -- need #defs for these registers */
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c0 = tx4927_process_sdccr((u64 *) 0xff1f8000);
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c1 = tx4927_process_sdccr((u64 *) 0xff1f8008);
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c2 = tx4927_process_sdccr((u64 *) 0xff1f8010);
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c3 = tx4927_process_sdccr((u64 *) 0xff1f8018);
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total = c0 + c1 + c2 + c3;
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return (total);
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}
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