Add support for EDB93xx boards

Added support for the following EDB93xx boards:

EDB9301
EDB9302
EDB9302A
EDB9307
EDB9307A
EDB93012
EDB9315
EDB9315A

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>

9 files changed, 656 insertions, 0 deletions

diff --git a/board/edb93xx/Makefile b/board/edb93xx/Makefile
new file mode 100644
index 0000000..e2e2636
--- /dev/null
+++ b/board/edb93xx/Makefile
@@ -0,0 +1,50 @@
+#
+# (C) Copyright 2003-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# 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
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= $(obj)lib$(BOARD).a
+
+COBJS	:= edb93xx.o flash_cfg.o pll_cfg.o sdram_cfg.o
+
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
+$(LIB):	$(obj).depend $(OBJS) $(SOBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+
+clean:
+	rm -f $(SOBJS) $(OBJS)
+
+distclean:	clean
+	rm -f $(LIB) core *.bak .depend
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/board/edb93xx/config.mk b/board/edb93xx/config.mk
new file mode 100644
index 0000000..b2fc6fa
--- /dev/null
+++ b/board/edb93xx/config.mk
@@ -0,0 +1,33 @@
+LDSCRIPT := $(SRCTREE)/cpu/arm920t/ep93xx/u-boot.lds
+
+ifdef CONFIG_EDB9301
+TEXT_BASE = 0x05700000
+endif
+
+ifdef CONFIG_EDB9302
+TEXT_BASE = 0x05700000
+endif
+
+ifdef CONFIG_EDB9302A
+TEXT_BASE = 0xc5700000
+endif
+
+ifdef CONFIG_EDB9307
+TEXT_BASE = 0x01f00000
+endif
+
+ifdef CONFIG_EDB9307A
+TEXT_BASE = 0xc1f00000
+endif
+
+ifdef CONFIG_EDB9312
+TEXT_BASE = 0x01f00000
+endif
+
+ifdef CONFIG_EDB9315
+TEXT_BASE = 0x01f00000
+endif
+
+ifdef CONFIG_EDB9315A
+TEXT_BASE = 0xc1f00000
+endif
diff --git a/board/edb93xx/early_udelay.h b/board/edb93xx/early_udelay.h
new file mode 100644
index 0000000..3b26b3f
--- /dev/null
+++ b/board/edb93xx/early_udelay.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
+ *
+ * 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
+ */
+
+#include <common.h>
+
+/* delay execution before timers are initialized */
+static inline void early_udelay(uint32_t usecs)
+{
+	/* loop takes 4 cycles at 5.0ns (fastest case, running at 200MHz) */
+	register uint32_t loops = (usecs * 1000) / 20;
+
+	__asm__ volatile ("1:\n"
+			"subs %0, %1, #1\n"
+			"bne 1b":"=r" (loops):"0" (loops));
+}
diff --git a/board/edb93xx/edb93xx.c b/board/edb93xx/edb93xx.c
new file mode 100644
index 0000000..4df2246
--- /dev/null
+++ b/board/edb93xx/edb93xx.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
+ *
+ * (C) Copyright 2002 2003
+ * Network Audio Technologies, Inc. <www.netaudiotech.com>
+ * Adam Bezanson <bezanson@netaudiotech.com>
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <netdev.h>
+#include <asm/arch/ep93xx.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define MAX_BANK_SIZE	0x04000000 /* 64 MB */
+
+static ulong const bank_addr[CONFIG_NR_DRAM_BANKS] = {
+	PHYS_SDRAM_1,
+#ifdef PHYS_SDRAM_2
+	PHYS_SDRAM_2,
+#endif
+#ifdef PHYS_SDRAM_3
+	PHYS_SDRAM_3,
+#endif
+#ifdef PHYS_SDRAM_4
+	PHYS_SDRAM_4
+#endif
+};
+
+int board_init(void)
+{
+	struct syscon_regs *syscon = (struct syscon_regs *)SYSCON_BASE;
+
+	icache_enable();
+
+#ifdef USE_920T_MMU
+	dcache_enable();
+#endif
+
+	/*
+	 * set UARTBAUD bit to drive UARTs with 14.7456MHz instead of
+	 * 14.7456/2 MHz
+	 */
+	uint32_t value = readl(&syscon->pwrcnt);
+	value |= SYSCON_PWRCNT_UART_BAUD;
+	writel(value, &syscon->pwrcnt);
+
+	/* Machine number, as defined in linux/arch/arm/tools/mach-types */
+	gd->bd->bi_arch_number = CONFIG_MACH_TYPE;
+
+	/* adress of boot parameters */
+	gd->bd->bi_boot_params = LINUX_BOOT_PARAM_ADDR;
+
+	/* We have a console */
+	gd->have_console = 1;
+
+	return 0;
+}
+
+int board_eth_init(bd_t *bd)
+{
+	return ep93xx_eth_initialize(0, MAC_BASE);
+}
+
+int dram_init(void)
+{
+	unsigned int *src, *dst;
+	int i;
+
+	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+		const ulong bank_size = get_ram_size((long *)bank_addr[i],
+						MAX_BANK_SIZE);
+		if (bank_size) {
+			gd->bd->bi_dram[i].start = bank_addr[i];
+			gd->bd->bi_dram[i].size = bank_size;
+		}
+	}
+
+	/* copy exception vectors */
+	src = (unsigned int *)_armboot_start;
+	dst = (unsigned int *)PHYS_SDRAM_1;
+	memcpy(dst, src, 16 * sizeof(unsigned int));
+
+	return 0;
+}
diff --git a/board/edb93xx/flash_cfg.c b/board/edb93xx/flash_cfg.c
new file mode 100644
index 0000000..a4c2048
--- /dev/null
+++ b/board/edb93xx/flash_cfg.c
@@ -0,0 +1,38 @@
+/*
+ * Flash setup for Cirrus edb93xx boards
+ *
+ * Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <asm/arch/ep93xx.h>
+#include <asm/io.h>
+
+#define SMC_BCR6_VALUE	(2 << SMC_BCR_IDCY_SHIFT | 5 << SMC_BCR_WST1_SHIFT |	\
+				SMC_BCR_BLE | 2 << SMC_BCR_WST2_SHIFT |		\
+				1 << SMC_BCR_MW_SHIFT)
+
+void flash_cfg(void)
+{
+	struct smc_regs *smc = (struct smc_regs *)SMC_BASE;
+
+	writel(SMC_BCR6_VALUE, &smc->bcr6);
+}
diff --git a/board/edb93xx/pll_cfg.c b/board/edb93xx/pll_cfg.c
new file mode 100644
index 0000000..a687af0
--- /dev/null
+++ b/board/edb93xx/pll_cfg.c
@@ -0,0 +1,58 @@
+/*
+ * PLL setup for Cirrus edb93xx boards
+ *
+ * Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
+ *
+ * Copyright (C) 2006 Dominic Rath <Dominic.Rath@gmx.de>
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include "pll_cfg.h"
+#include "early_udelay.h"
+
+void pll_cfg(void)
+{
+	struct syscon_regs *syscon = (struct syscon_regs *)SYSCON_BASE;
+
+	/* setup PLL1 */
+	writel(CLKSET1_VAL, &syscon->clkset1);
+
+	/*
+	 * flush the pipeline
+	 * writing to CLKSET1 causes the EP93xx to enter standby for between
+	 * 8 ms to 16 ms, until PLL1 stabilizes
+	 */
+	asm("nop");
+	asm("nop");
+	asm("nop");
+	asm("nop");
+	asm("nop");
+
+	/* setup PLL2 */
+	writel(CLKSET2_VAL, &syscon->clkset2);
+
+	/*
+	 * the user's guide recommends to wait at least 1 ms for PLL2 to
+	 * stabilize
+	 */
+	early_udelay(1000);
+}
diff --git a/board/edb93xx/pll_cfg.h b/board/edb93xx/pll_cfg.h
new file mode 100644
index 0000000..0b6f469
--- /dev/null
+++ b/board/edb93xx/pll_cfg.h
@@ -0,0 +1,72 @@
+/*
+ * PLL register values for Cirrus edb93xx boards
+ *
+ * Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
+ *
+ * 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
+ */
+
+#include <config.h>
+#include <asm/arch/ep93xx.h>
+
+#if defined(CONFIG_EDB9301) || defined(CONFIG_EDB9302) ||	\
+	defined(CONFIG_EDB9302A)
+/*
+ * fclk_div: 2, nbyp1: 1, hclk_div: 5, pclk_div: 2
+ * pll1_x1: 294912000.000000, pll1_x2ip: 36864000.000000,
+ * pll1_x2: 331776000.000000, pll1_out: 331776000.000000
+ */
+#define CLKSET1_VAL	(7 << SYSCON_CLKSET_PLL_X2IPD_SHIFT |	\
+			8 << SYSCON_CLKSET_PLL_X2FBD2_SHIFT |	\
+			19 << SYSCON_CLKSET_PLL_X1FBD1_SHIFT |	\
+			1 << SYSCON_CLKSET1_PCLK_DIV_SHIFT |	\
+			3 << SYSCON_CLKSET1_HCLK_DIV_SHIFT |	\
+			SYSCON_CLKSET1_NBYP1 |			\
+			1 << SYSCON_CLKSET1_FCLK_DIV_SHIFT)
+#elif defined(CONFIG_EDB9307) || defined(CONFIG_EDB9307A) ||	\
+	defined CONFIG_EDB9312 || defined(CONFIG_EDB9315) ||	\
+	defined(CONFIG_EDB9315A)
+/*
+ * fclk_div: 2, nbyp1: 1, hclk_div: 4, pclk_div: 2
+ * pll1_x1: 3096576000.000000, pll1_x2ip: 129024000.000000,
+ * pll1_x2: 3999744000.000000, pll1_out: 1999872000.000000
+ */
+#define CLKSET1_VAL	(23 << SYSCON_CLKSET_PLL_X2IPD_SHIFT |	\
+			30 << SYSCON_CLKSET_PLL_X2FBD2_SHIFT |	\
+			20 << SYSCON_CLKSET_PLL_X1FBD1_SHIFT |	\
+			1 << SYSCON_CLKSET1_PCLK_DIV_SHIFT |	\
+			2 << SYSCON_CLKSET1_HCLK_DIV_SHIFT |	\
+			SYSCON_CLKSET1_NBYP1 |			\
+			1 << SYSCON_CLKSET1_FCLK_DIV_SHIFT)
+#else
+#error "Undefined board"
+#endif
+
+/*
+ * usb_div: 4, nbyp2: 1, pll2_en: 1
+ * pll2_x1: 368640000.000000, pll2_x2ip: 15360000.000000,
+ * pll2_x2: 384000000.000000, pll2_out: 192000000.000000
+ */
+#define CLKSET2_VAL	(23 << SYSCON_CLKSET_PLL_X2IPD_SHIFT |	\
+			24 << SYSCON_CLKSET_PLL_X2FBD2_SHIFT |	\
+			24 << SYSCON_CLKSET_PLL_X1FBD1_SHIFT |	\
+			1 << SYSCON_CLKSET_PLL_PS_SHIFT |	\
+			SYSCON_CLKSET2_PLL2_EN |		\
+			SYSCON_CLKSET2_NBYP2 |			\
+			3 << SYSCON_CLKSET2_USB_DIV_SHIFT)
diff --git a/board/edb93xx/sdram_cfg.c b/board/edb93xx/sdram_cfg.c
new file mode 100644
index 0000000..6155f0e
--- /dev/null
+++ b/board/edb93xx/sdram_cfg.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
+ *
+ * Copyright (C) 2006 Dominic Rath <Dominic.Rath@gmx.de>
+ *
+ * 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
+ */
+
+#include <asm/io.h>
+#include "sdram_cfg.h"
+#include "early_udelay.h"
+
+#define PROGRAM_MODE_REG(bank)		(*(volatile uint32_t *)		\
+		(SDRAM_BASE_ADDR | SDRAM_BANK_SEL_##bank | SDRAM_MODE_REG_VAL))
+
+#define PRECHARGE_BANK(bank)		(*(volatile uint32_t *)		\
+				(SDRAM_BASE_ADDR | SDRAM_BANK_SEL_##bank))
+
+static void force_precharge(void);
+static void setup_refresh_timer(void);
+static void program_mode_registers(void);
+
+void sdram_cfg(void)
+{
+	struct sdram_regs *sdram = (struct sdram_regs *)SDRAM_BASE;
+
+	writel(SDRAM_DEVCFG_VAL, &sdram->SDRAM_DEVCFG_REG);
+
+	/* Issue continous NOP commands */
+	writel(GLCONFIG_INIT | GLCONFIG_MRS | GLCONFIG_CKE, &sdram->glconfig);
+
+	early_udelay(200);
+
+	force_precharge();
+
+	setup_refresh_timer();
+
+	program_mode_registers();
+
+	/* Select normal operation mode */
+	writel(GLCONFIG_CKE, &sdram->glconfig);
+}
+
+static void force_precharge(void)
+{
+	/*
+	 * Errata most EP93xx revisions say that PRECHARGE ALL isn't always
+	 * issued.
+	 *
+	 * Do a read from each bank to make sure they're precharged
+	 */
+
+	PRECHARGE_BANK(0);
+	PRECHARGE_BANK(1);
+	PRECHARGE_BANK(2);
+	PRECHARGE_BANK(3);
+}
+
+static void setup_refresh_timer(void)
+{
+	struct sdram_regs *sdram = (struct sdram_regs *)SDRAM_BASE;
+
+	/* Load refresh timer with 10 to issue refresh every 10 cycles */
+	writel(0x0a, &sdram->refrshtimr);
+
+	/*
+	 * Wait at least 80 clock cycles to provide 8 refresh cycles
+	 * to all SDRAMs
+	 */
+	early_udelay(1);
+
+	/*
+	 * Program refresh timer with normal value
+	 * We need 8192 refresh cycles every 64ms
+	 * at 15ns (HCLK >= 66MHz) per cycle:
+	 * 64ms / 8192 = 7.8125us
+	 * 7.8125us / 15ns = 520 (0x208)
+	 */
+	/*
+	 * TODO: redboot uses 0x1e0 for the slowest possible device
+	 * but i don't understand how this value is calculated
+	 */
+	writel(0x208, &sdram->refrshtimr);
+}
+
+static void program_mode_registers(void)
+{
+	/*
+	 * The mode registers are programmed by performing a read from each
+	 * SDRAM bank. The value of the address that is read defines the value
+	 * that is written into the mode register
+	 */
+
+	PROGRAM_MODE_REG(0);
+
+#if (CONFIG_NR_DRAM_BANKS >= 2)
+	PROGRAM_MODE_REG(1);
+#endif
+
+#if (CONFIG_NR_DRAM_BANKS >= 3)
+	PROGRAM_MODE_REG(2);
+#endif
+
+#if (CONFIG_NR_DRAM_BANKS == 4)
+	PROGRAM_MODE_REG(3);
+#endif
+}
diff --git a/board/edb93xx/sdram_cfg.h b/board/edb93xx/sdram_cfg.h
new file mode 100644
index 0000000..757b63c
--- /dev/null
+++ b/board/edb93xx/sdram_cfg.h
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
+ *
+ * Copyright (C) 2006 Dominic Rath <Dominic.Rath@gmx.de>
+ *
+ * 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
+ */
+
+#include <config.h>
+#include <asm/arch/ep93xx.h>
+
+#define SDRAM_BASE_ADDR		PHYS_SDRAM_1
+
+#ifdef CONFIG_EDB93XX_SDCS0
+#define SDRAM_DEVCFG_REG	devcfg0
+#elif defined(CONFIG_EDB93XX_SDCS3)
+#define SDRAM_DEVCFG_REG	devcfg3
+#else
+#error "SDRAM bank configuration"
+#endif
+
+#if defined(CONFIG_EDB9301) || defined(CONFIG_EDB9302) ||	\
+	defined(CONFIG_EDB9302A)
+/*
+ * 1x Samsung K4S561632C-TC/L75 4M x 16bit x 4 banks SDRAM
+ *
+ * CLK cycle time min:
+ *	@ CAS latency = 3: 7.5ns
+ *	@ CAS latency = 2: 10ns
+ * We're running at 66MHz (15ns cycle time) external bus speed (HCLK),
+ * so it's safe to use CAS latency = 2
+ *
+ * RAS-to-CAS delay min:
+ *	20ns
+ * At 15ns cycle time, we use RAS-to-CAS delay = 2
+ *
+ * SROMLL = 1: Swap BA[1:0] with A[13:12], making the SDRAM appear
+ * as four blocks of 8MB size, instead of eight blocks of 4MB size:
+ *
+ * EDB9301/EDB9302:
+ *
+ * 0x00000000 - 0x007fffff
+ * 0x01000000 - 0x017fffff
+ * 0x04000000 - 0x047fffff
+ * 0x05000000 - 0x057fffff
+ *
+ *
+ * EDB9302a:
+ *
+ * 0xc0000000 - 0xc07fffff
+ * 0xc1000000 - 0xc17fffff
+ * 0xc4000000 - 0xc47fffff
+ * 0xc5000000 - 0xc57fffff
+ *
+ * BANKCOUNT = 1: This is a device with four banks
+ */
+
+#define SDRAM_DEVCFG_VAL (SDRAM_DEVCFG_BANKCOUNT |			\
+				SDRAM_DEVCFG_SROMLL |			\
+				SDRAM_DEVCFG_CASLAT_2 |			\
+				SDRAM_DEVCFG_RASTOCAS_2 |		\
+				SDRAM_DEVCFG_EXTBUSWIDTH)
+
+/*
+ * 16 bit ext. bus
+ *
+ * A[22:09] is output as SYA[13:0]
+ * CAS latency: 2
+ * Burst type: sequential
+ * Burst length: 8 (required for 16 bit ext. bus)
+ * SYA[13:0] = 0x0023
+ */
+#define SDRAM_MODE_REG_VAL	0x4600
+
+#define SDRAM_BANK_SEL_0	0x00000000 /* A[22:21] = b00 */
+#define SDRAM_BANK_SEL_1	0x00200000 /* A[22:21] = b01 */
+#define SDRAM_BANK_SEL_2	0x00400000 /* A[22:21] = b10 */
+#define SDRAM_BANK_SEL_3	0x00600000 /* A[22:21] = b11 */
+
+#elif defined(CONFIG_EDB9307) || defined(CONFIG_EDB9307A) ||	\
+	defined CONFIG_EDB9312 || defined(CONFIG_EDB9315) ||	\
+	defined(CONFIG_EDB9315A)
+/*
+ * 2x Samsung K4S561632C-TC/L75 4M x 16bit x 4 banks SDRAM
+ *
+ * CLK cycle time min:
+ *	@ CAS latency = 3: 7.5ns
+ *	@ CAS latency = 2: 10ns
+ * We're running at 100MHz (10ns cycle time) external bus speed (HCLK),
+ * so it's safe to use CAS latency = 2
+ *
+ * RAS-to-CAS delay min:
+ *	20ns
+ * At 10ns cycle time, we use RAS-to-CAS delay = 2
+ *
+ * EDB9307, EDB9312, EDB9315:
+ *
+ * 0x00000000 - 0x01ffffff
+ * 0x04000000 - 0x05ffffff
+ *
+ *
+ * EDB9307a, EDB9315a:
+ *
+ * 0xc0000000 - 0xc1ffffff
+ * 0xc4000000 - 0xc5ffffff
+ */
+
+#define SDRAM_DEVCFG_VAL	(SDRAM_DEVCFG_BANKCOUNT |		\
+				SDRAM_DEVCFG_SROMLL |			\
+				SDRAM_DEVCFG_CASLAT_2 |			\
+				SDRAM_DEVCFG_RASTOCAS_2)
+
+/*
+ * 32 bit ext. bus
+ *
+ * A[23:10] is output as SYA[13:0]
+ * CAS latency: 2
+ * Burst type: sequential
+ * Burst length: 4
+ * SYA[13:0] = 0x0022
+ */
+#define SDRAM_MODE_REG_VAL	0x8800
+
+#define SDRAM_BANK_SEL_0	0x00000000 /* A[23:22] = b00 */
+#define SDRAM_BANK_SEL_1	0x00400000 /* A[23:22] = b01 */
+#define SDRAM_BANK_SEL_2	0x00800000 /* A[23:22] = b10 */
+#define SDRAM_BANK_SEL_3	0x00c00000 /* A[23:22] = b11 */
+#endif