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Diffstat (limited to 'board/micronas/vct/ebi_nor_flash.c')
-rw-r--r--board/micronas/vct/ebi_nor_flash.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/board/micronas/vct/ebi_nor_flash.c b/board/micronas/vct/ebi_nor_flash.c
new file mode 100644
index 0000000000..ae8764395e
--- /dev/null
+++ b/board/micronas/vct/ebi_nor_flash.c
@@ -0,0 +1,131 @@
+/*
+ * (C) Copyright 2008 Stefan Roese <sr@denx.de>, DENX Software Engineering
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include "vct.h"
+
+static u32 ebi_read(u32 addr)
+{
+ addr &= ~0xFC000000;
+
+ reg_write(EBI_CPU_IO_ACCS(EBI_BASE), EXT_DEVICE_CHANNEL_2 | addr);
+ ebi_wait();
+
+ return reg_read(EBI_IO_ACCS_DATA(EBI_BASE));
+}
+
+static int ebi_write_u16(u32 addr, u32 data, int fetchIO)
+{
+ u32 val = (data << 16);
+
+ addr &= ~0xFC000000;
+
+ ebi_wait();
+
+ reg_write(EBI_IO_ACCS_DATA(EBI_BASE), val);
+ reg_write(EBI_CPU_IO_ACCS(EBI_BASE),
+ EXT_DEVICE_CHANNEL_2 | EBI_CPU_WRITE | addr);
+ ebi_wait();
+
+ if (fetchIO) {
+ u32 counter = 0;
+ while (!(reg_read(EBI_SIG_LEVEL(EBI_BASE)) & EXT_CPU_IORDY_SL)) {
+ if (counter++ > 0xFFFFFF)
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static u16 ebi_read_u16(u32 addr)
+{
+ return ((ebi_read(addr) >> 16) & 0xFFFF);
+}
+
+static u8 ebi_read_u8(u32 addr)
+{
+ u32 val = ebi_read(addr) >> 16;
+
+ if (addr & 0x1)
+ return val & 0xff;
+ else
+ return (val >> 8) & 0xff;
+}
+
+/*
+ * EBI initialization for NOR FLASH access
+ */
+int ebi_init_nor_flash(void)
+{
+ reg_write(EBI_DEV1_CONFIG1(EBI_BASE), 0x83000);
+
+ reg_write(EBI_DEV2_CONFIG1(EBI_BASE), 0x400002);
+ reg_write(EBI_DEV2_CONFIG2(EBI_BASE), 0x50);
+
+ reg_write(EBI_DEV2_TIM1_RD1(EBI_BASE), 0x409113);
+ reg_write(EBI_DEV2_TIM1_RD2(EBI_BASE), 0xFF01000);
+ reg_write(EBI_DEV2_TIM1_WR1(EBI_BASE), 0x04003113);
+ reg_write(EBI_DEV2_TIM1_WR2(EBI_BASE), 0x3FC12011);
+ reg_write(EBI_DEV2_TIM_EXT(EBI_BASE), 0xFFF00000);
+
+ return 0;
+}
+
+/*
+ * Accessor functions replacing the "weak" functions in
+ * drivers/mtd/cfi_flash.c
+ */
+void flash_write8(u8 value, void *addr)
+{
+ ebi_write_u16((u32)addr, value, 0);
+}
+
+void flash_write16(u16 value, void *addr)
+{
+ ebi_write_u16((u32)addr, value, 0);
+}
+
+u8 flash_read8(void *addr)
+{
+ return ebi_read_u8((u32)addr);
+}
+
+u16 flash_read16(void *addr)
+{
+ return ebi_read_u16((u32)addr);
+}
+
+u32 flash_read32(void *addr)
+{
+ return ((u32)ebi_read_u16((u32)addr) << 16) |
+ ebi_read_u16((u32)addr + 2);
+}
+
+void *board_flash_read_memcpy(void *dest, const void *src, size_t count)
+{
+ u16 *tmp = (u16 *)dest, *s = (u16 *)src;
+ int i;
+
+ for (i = 0; i < count; i += 2)
+ *tmp++ = flash_read16(s++);
+
+ return dest;
+}