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-rw-r--r--board/armltd/integrator/arm-ebi.h62
-rw-r--r--board/armltd/integrator/integrator.c15
2 files changed, 77 insertions, 0 deletions
diff --git a/board/armltd/integrator/arm-ebi.h b/board/armltd/integrator/arm-ebi.h
new file mode 100644
index 0000000..2d85e3f
--- /dev/null
+++ b/board/armltd/integrator/arm-ebi.h
@@ -0,0 +1,62 @@
+/*
+ * (C) Copyright 2011
+ * Linaro
+ * Linus Walleij <linus.walleij@linaro.org>
+ * Register definitions for the External Bus Interface (EBI)
+ * found in the ARM Integrator AP and CP reference designs
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __ARM_EBI_H
+#define __ARM_EBI_H
+
+#define EBI_BASE 0x12000000
+
+#define EBI_CSR0_REG 0x00 /* CS0 = Boot ROM */
+#define EBI_CSR1_REG 0x04 /* CS1 = Flash */
+#define EBI_CSR2_REG 0x08 /* CS2 = SSRAM */
+#define EBI_CSR3_REG 0x0C /* CS3 = Expansion memory */
+/*
+ * The four upper bits are the waitstates for each chip select
+ * 0x00 = 2 cycles, 0x10 = 3 cycles, ... 0xe0 = 16 cycles, 0xf0 = 16 cycles
+ */
+#define EBI_CSR_WAIT_MASK 0xF0
+/* Whether memory is synchronous or asynchronous */
+#define EBI_CSR_SYNC_MASK 0xF7
+#define EBI_CSR_ASYNC 0x00
+#define EBI_CSR_SYNC 0x08
+/* Whether memory is write enabled or not */
+#define EBI_CSR_WREN_MASK 0xFB
+#define EBI_CSR_WREN_DISABLE 0x00
+#define EBI_CSR_WREN_ENABLE 0x04
+/* Memory bit width for each chip select */
+#define EBI_CSR_MEMSIZE_MASK 0xFC
+#define EBI_CSR_MEMSIZE_8BIT 0x00
+#define EBI_CSR_MEMSIZE_16BIT 0x01
+#define EBI_CSR_MEMSIZE_32BIT 0x02
+
+/*
+ * The lock register need to be written with 0xa05f before anything in the
+ * EBI can be changed.
+ */
+#define EBI_LOCK_REG 0x20
+#define EBI_UNLOCK_MAGIC 0xA05F
+
+#endif
diff --git a/board/armltd/integrator/integrator.c b/board/armltd/integrator/integrator.c
index 780218c..dd83ca5 100644
--- a/board/armltd/integrator/integrator.c
+++ b/board/armltd/integrator/integrator.c
@@ -36,6 +36,7 @@
#include <common.h>
#include <netdev.h>
#include <asm/io.h>
+#include "arm-ebi.h"
DECLARE_GLOBAL_DATA_PTR;
@@ -56,6 +57,8 @@ void show_boot_progress(int progress)
int board_init (void)
{
+ u32 val;
+
/* arch number of Integrator Board */
#ifdef CONFIG_ARCH_CINTEGRATOR
gd->bd->bi_arch_number = MACH_TYPE_CINTEGRATOR;
@@ -73,6 +76,18 @@ extern void cm_remap(void);
cm_remap(); /* remaps writeable memory to 0x00000000 */
#endif
+ /*
+ * The system comes up with the flash memory non-writable and
+ * configuration locked. If we want U-Boot to be used for flash
+ * access we cannot have the flash memory locked.
+ */
+ writel(EBI_UNLOCK_MAGIC, EBI_BASE + EBI_LOCK_REG);
+ val = readl(EBI_BASE + EBI_CSR1_REG);
+ val &= EBI_CSR_WREN_MASK;
+ val |= EBI_CSR_WREN_ENABLE;
+ writel(val, EBI_BASE + EBI_CSR1_REG);
+ writel(0, EBI_BASE + EBI_LOCK_REG);
+
icache_enable ();
return 0;