1 /* 2 * common tx4927 memory interface 3 * 4 * Author: MontaVista Software, Inc. 5 * source@mvista.com 6 * 7 * Copyright 2001-2002 MontaVista Software Inc. 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 15 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 16 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 20 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 22 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 23 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * You should have received a copy of the GNU General Public License along 26 * with this program; if not, write to the Free Software Foundation, Inc., 27 * 675 Mass Ave, Cambridge, MA 02139, USA. 28 */ 29 30 #include <linux/init.h> 31 #include <linux/types.h> 32 #include <linux/io.h> 33 #include <asm/txx9/tx4927.h> 34 35 static unsigned int __init tx4927_process_sdccr(u64 __iomem *addr) 36 { 37 u64 val; 38 unsigned int sdccr_ce; 39 unsigned int sdccr_bs; 40 unsigned int sdccr_rs; 41 unsigned int sdccr_cs; 42 unsigned int sdccr_mw; 43 unsigned int bs = 0; 44 unsigned int rs = 0; 45 unsigned int cs = 0; 46 unsigned int mw = 0; 47 48 val = __raw_readq(addr); 49 50 /* MVMCP -- need #defs for these bits masks */ 51 sdccr_ce = ((val & (1 << 10)) >> 10); 52 sdccr_bs = ((val & (1 << 8)) >> 8); 53 sdccr_rs = ((val & (3 << 5)) >> 5); 54 sdccr_cs = ((val & (7 << 2)) >> 2); 55 sdccr_mw = ((val & (1 << 0)) >> 0); 56 57 if (sdccr_ce) { 58 bs = 2 << sdccr_bs; 59 rs = 2048 << sdccr_rs; 60 cs = 256 << sdccr_cs; 61 mw = 8 >> sdccr_mw; 62 } 63 64 return rs * cs * mw * bs; 65 } 66 67 unsigned int __init tx4927_get_mem_size(void) 68 { 69 unsigned int total = 0; 70 int i; 71 72 for (i = 0; i < ARRAY_SIZE(tx4927_sdramcptr->cr); i++) 73 total += tx4927_process_sdccr(&tx4927_sdramcptr->cr[i]); 74 return total; 75 } 76