1 /* 2 * linux/arch/mips/txx9/generic/mem_tx4927.c 3 * 4 * common tx4927 memory interface 5 * 6 * Author: MontaVista Software, Inc. 7 * source@mvista.com 8 * 9 * Copyright 2001-2002 MontaVista Software Inc. 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License as published by the 13 * Free Software Foundation; either version 2 of the License, or (at your 14 * option) any later version. 15 * 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 24 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 25 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * You should have received a copy of the GNU General Public License along 28 * with this program; if not, write to the Free Software Foundation, Inc., 29 * 675 Mass Ave, Cambridge, MA 02139, USA. 30 */ 31 32 #include <linux/init.h> 33 #include <linux/types.h> 34 #include <linux/io.h> 35 #include <asm/txx9/tx4927.h> 36 37 static unsigned int __init tx4927_process_sdccr(u64 __iomem *addr) 38 { 39 u64 val; 40 unsigned int sdccr_ce; 41 unsigned int sdccr_bs; 42 unsigned int sdccr_rs; 43 unsigned int sdccr_cs; 44 unsigned int sdccr_mw; 45 unsigned int bs = 0; 46 unsigned int rs = 0; 47 unsigned int cs = 0; 48 unsigned int mw = 0; 49 50 val = __raw_readq(addr); 51 52 /* MVMCP -- need #defs for these bits masks */ 53 sdccr_ce = ((val & (1 << 10)) >> 10); 54 sdccr_bs = ((val & (1 << 8)) >> 8); 55 sdccr_rs = ((val & (3 << 5)) >> 5); 56 sdccr_cs = ((val & (7 << 2)) >> 2); 57 sdccr_mw = ((val & (1 << 0)) >> 0); 58 59 if (sdccr_ce) { 60 bs = 2 << sdccr_bs; 61 rs = 2048 << sdccr_rs; 62 cs = 256 << sdccr_cs; 63 mw = 8 >> sdccr_mw; 64 } 65 66 return rs * cs * mw * bs; 67 } 68 69 unsigned int __init tx4927_get_mem_size(void) 70 { 71 unsigned int total = 0; 72 int i; 73 74 for (i = 0; i < ARRAY_SIZE(tx4927_sdramcptr->cr); i++) 75 total += tx4927_process_sdccr(&tx4927_sdramcptr->cr[i]); 76 return total; 77 } 78