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Diffstat (limited to 'arch/mips/txx9/generic/mem_tx4927.c')
-rw-r--r--arch/mips/txx9/generic/mem_tx4927.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/mips/txx9/generic/mem_tx4927.c b/arch/mips/txx9/generic/mem_tx4927.c
new file mode 100644
index 000000000..deea2ceae
--- /dev/null
+++ b/arch/mips/txx9/generic/mem_tx4927.c
@@ -0,0 +1,75 @@
+/*
+ * 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/txx9/tx4927.h>
+
+static unsigned int __init tx4927_process_sdccr(u64 __iomem *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;
+
+ val = __raw_readq(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 & (7 << 2)) >> 2);
+ sdccr_mw = ((val & (1 << 0)) >> 0);
+
+ if (sdccr_ce) {
+ bs = 2 << sdccr_bs;
+ rs = 2048 << sdccr_rs;
+ cs = 256 << sdccr_cs;
+ mw = 8 >> sdccr_mw;
+ }
+
+ return rs * cs * mw * bs;
+}
+
+unsigned int __init tx4927_get_mem_size(void)
+{
+ unsigned int total = 0;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(tx4927_sdramcptr->cr); i++)
+ total += tx4927_process_sdccr(&tx4927_sdramcptr->cr[i]);
+ return total;
+}