| /* |
| * 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/types.h> |
| #include <linux/io.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); |
| } |