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/*
* linux/arch/mips/tx4927/common/tx4927_prom.c
*
* common tx4927 memory interface
*
* Author: MontaVista Software, Inc.
* source@mvista.com
*
* Copyright 2001-2002 MontaVista Software Inc.
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/bootmem.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/tx4927/tx4927.h>
static unsigned int __init tx4927_process_sdccr(unsigned long addr)
{
u64 val;
unsigned int sdccr_ce;
unsigned int sdccr_bs;
unsigned int sdccr_rs;
unsigned int sdccr_cs;
unsigned int sdccr_mw;
unsigned int bs = 0;
unsigned int rs = 0;
unsigned int cs = 0;
unsigned int mw = 0;
unsigned int msize = 0;
val = __raw_readq((void __iomem *)addr);
/* MVMCP -- need #defs for these bits masks */
sdccr_ce = ((val & (1 << 10)) >> 10);
sdccr_bs = ((val & (1 << 8)) >> 8);
sdccr_rs = ((val & (3 << 5)) >> 5);
sdccr_cs = ((val & (3 << 2)) >> 2);
sdccr_mw = ((val & (1 << 0)) >> 0);
if (sdccr_ce) {
switch (sdccr_bs) {
case 0:{
bs = 2;
break;
}
case 1:{
bs = 4;
break;
}
}
switch (sdccr_rs) {
case 0:{
rs = 2048;
break;
}
case 1:{
rs = 4096;
break;
}
case 2:{
rs = 8192;
break;
}
case 3:{
rs = 0;
break;
}
}
switch (sdccr_cs) {
case 0:{
cs = 256;
break;
}
case 1:{
cs = 512;
break;
}
case 2:{
cs = 1024;
break;
}
case 3:{
cs = 2048;
break;
}
}
switch (sdccr_mw) {
case 0:{
mw = 8;
break;
} /* 8 bytes = 64 bits */
case 1:{
mw = 4;
break;
} /* 4 bytes = 32 bits */
}
}
/* bytes per chip MB per chip num chips */
msize = (((rs * cs * mw) / (1024 * 1024)) * bs);
return (msize);
}
unsigned int __init tx4927_get_mem_size(void)
{
unsigned int c0;
unsigned int c1;
unsigned int c2;
unsigned int c3;
unsigned int total;
/* MVMCP -- need #defs for these registers */
c0 = tx4927_process_sdccr(0xff1f8000);
c1 = tx4927_process_sdccr(0xff1f8008);
c2 = tx4927_process_sdccr(0xff1f8010);
c3 = tx4927_process_sdccr(0xff1f8018);
total = c0 + c1 + c2 + c3;
return (total);
}
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