ARM:AM33XX: Add emif/ddr support

This patch adds AM33xx emif/ddr support along with board specific
defines.

Signed-off-by: Chandan Nath <chandan.nath@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

5 files changed, 654 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/am33xx/Makefile b/arch/arm/cpu/armv7/am33xx/Makefile
index fc25587fa3..7ed667877b 100644
--- a/arch/arm/cpu/armv7/am33xx/Makefile
+++ b/arch/arm/cpu/armv7/am33xx/Makefile
@@ -20,6 +20,9 @@ SOBJS	:= lowlevel_init.o
 
 COBJS	+= clock.o
 COBJS	+= sys_info.o
+COBJS	+= ddr.o
+COBJS	+= emif4.o
+
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS) $(COBJS-y) $(SOBJS))
diff --git a/arch/arm/cpu/armv7/am33xx/ddr.c b/arch/arm/cpu/armv7/am33xx/ddr.c
new file mode 100644
index 0000000000..ed982c11e8
--- /dev/null
+++ b/arch/arm/cpu/armv7/am33xx/ddr.c
@@ -0,0 +1,147 @@
+/*
+ * DDR Configuration for AM33xx devices.
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated -
+http://www.ti.com/
+ *
+ * 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 .as is. WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <asm/arch/cpu.h>
+#include <asm/arch/ddr_defs.h>
+#include <asm/io.h>
+
+/**
+ * Base address for EMIF instances
+ */
+static struct emif_regs *emif_reg = {
+				(struct emif_regs *)EMIF4_0_CFG_BASE};
+
+/**
+ * Base address for DDR instance
+ */
+static struct ddr_regs *ddr_reg[2] = {
+				(struct ddr_regs *)DDR_PHY_BASE_ADDR,
+				(struct ddr_regs *)DDR_PHY_BASE_ADDR2};
+
+/**
+ * Base address for ddr io control instances
+ */
+static struct ddr_cmdtctrl *ioctrl_reg = {
+			(struct ddr_cmdtctrl *)DDR_CONTROL_BASE_ADDR};
+
+/**
+ * As a convention, all functions here return 0 on success
+ * -1 on failure.
+ */
+
+/**
+ * Configure SDRAM
+ */
+int config_sdram(struct sdram_config *cfg)
+{
+	writel(cfg->sdrcr, &emif_reg->sdrcr);
+	writel(cfg->sdrcr2, &emif_reg->sdrcr2);
+	writel(cfg->refresh, &emif_reg->sdrrcr);
+	writel(cfg->refresh_sh, &emif_reg->sdrrcsr);
+
+	return 0;
+}
+
+/**
+ * Set SDRAM timings
+ */
+int set_sdram_timings(struct sdram_timing *t)
+{
+	writel(t->time1, &emif_reg->sdrtim1);
+	writel(t->time1_sh, &emif_reg->sdrtim1sr);
+	writel(t->time2, &emif_reg->sdrtim2);
+	writel(t->time2_sh, &emif_reg->sdrtim2sr);
+	writel(t->time3, &emif_reg->sdrtim3);
+	writel(t->time3_sh, &emif_reg->sdrtim3sr);
+
+	return 0;
+}
+
+/**
+ * Configure DDR PHY
+ */
+int config_ddr_phy(struct ddr_phy_control *p)
+{
+	writel(p->reg, &emif_reg->ddrphycr);
+	writel(p->reg_sh, &emif_reg->ddrphycsr);
+
+	return 0;
+}
+
+/**
+ * Configure DDR CMD control registers
+ */
+int config_cmd_ctrl(struct cmd_control *cmd)
+{
+	writel(cmd->cmd0csratio, &ddr_reg[0]->cm0csratio);
+	writel(cmd->cmd0csforce, &ddr_reg[0]->cm0csforce);
+	writel(cmd->cmd0csdelay, &ddr_reg[0]->cm0csdelay);
+	writel(cmd->cmd0dldiff, &ddr_reg[0]->cm0dldiff);
+	writel(cmd->cmd0iclkout, &ddr_reg[0]->cm0iclkout);
+
+	writel(cmd->cmd1csratio, &ddr_reg[0]->cm1csratio);
+	writel(cmd->cmd1csforce, &ddr_reg[0]->cm1csforce);
+	writel(cmd->cmd1csdelay, &ddr_reg[0]->cm1csdelay);
+	writel(cmd->cmd1dldiff, &ddr_reg[0]->cm1dldiff);
+	writel(cmd->cmd1iclkout, &ddr_reg[0]->cm1iclkout);
+
+	writel(cmd->cmd2csratio, &ddr_reg[0]->cm2csratio);
+	writel(cmd->cmd2csforce, &ddr_reg[0]->cm2csforce);
+	writel(cmd->cmd2csdelay, &ddr_reg[0]->cm2csdelay);
+	writel(cmd->cmd2dldiff, &ddr_reg[0]->cm2dldiff);
+	writel(cmd->cmd2iclkout, &ddr_reg[0]->cm2iclkout);
+
+	return 0;
+}
+
+/**
+ * Configure DDR DATA registers
+ */
+int config_ddr_data(int macrono, struct ddr_data *data)
+{
+	writel(data->datardsratio0, &ddr_reg[macrono]->dt0rdsratio0);
+	writel(data->datardsratio1, &ddr_reg[macrono]->dt0rdsratio1);
+
+	writel(data->datawdsratio0, &ddr_reg[macrono]->dt0wdsratio0);
+	writel(data->datawdsratio1, &ddr_reg[macrono]->dt0wdsratio1);
+
+	writel(data->datawiratio0, &ddr_reg[macrono]->dt0wiratio0);
+	writel(data->datawiratio1, &ddr_reg[macrono]->dt0wiratio1);
+	writel(data->datagiratio0, &ddr_reg[macrono]->dt0giratio0);
+	writel(data->datagiratio1, &ddr_reg[macrono]->dt0giratio1);
+
+	writel(data->datafwsratio0, &ddr_reg[macrono]->dt0fwsratio0);
+	writel(data->datafwsratio1, &ddr_reg[macrono]->dt0fwsratio1);
+
+	writel(data->datawrsratio0, &ddr_reg[macrono]->dt0wrsratio0);
+	writel(data->datawrsratio1, &ddr_reg[macrono]->dt0wrsratio1);
+
+	writel(data->datadldiff0, &ddr_reg[macrono]->dt0dldiff0);
+
+	return 0;
+}
+
+int config_io_ctrl(struct ddr_ioctrl *ioctrl)
+{
+	writel(ioctrl->cmd1ctl, &ioctrl_reg->cm0ioctl);
+	writel(ioctrl->cmd2ctl, &ioctrl_reg->cm1ioctl);
+	writel(ioctrl->cmd3ctl, &ioctrl_reg->cm2ioctl);
+	writel(ioctrl->data1ctl, &ioctrl_reg->dt0ioctl);
+	writel(ioctrl->data2ctl, &ioctrl_reg->dt1ioctl);
+
+	return 0;
+}
diff --git a/arch/arm/cpu/armv7/am33xx/emif4.c b/arch/arm/cpu/armv7/am33xx/emif4.c
new file mode 100644
index 0000000000..1318365a4a
--- /dev/null
+++ b/arch/arm/cpu/armv7/am33xx/emif4.c
@@ -0,0 +1,201 @@
+/*
+ * emif4.c
+ *
+ * AM33XX emif4 configuration file
+ *
+ * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
+ *
+ * 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.
+ */
+
+#include <common.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/ddr_defs.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/clock.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct ddr_regs *ddrregs = (struct ddr_regs *)DDR_PHY_BASE_ADDR;
+struct vtp_reg *vtpreg = (struct vtp_reg *)VTP0_CTRL_ADDR;
+struct ddr_ctrl *ddrctrl = (struct ddr_ctrl *)DDR_CTRL_ADDR;
+
+
+int dram_init(void)
+{
+	/* dram_init must store complete ramsize in gd->ram_size */
+	gd->ram_size = get_ram_size(
+			(void *)CONFIG_SYS_SDRAM_BASE,
+			CONFIG_MAX_RAM_BANK_SIZE);
+	return 0;
+}
+
+void dram_init_banksize(void)
+{
+	gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE;
+	gd->bd->bi_dram[0].size = gd->ram_size;
+}
+
+
+#ifdef CONFIG_AM335X_CONFIG_DDR
+static void data_macro_config(int dataMacroNum)
+{
+	struct ddr_data data;
+
+	data.datardsratio0 = ((DDR2_RD_DQS<<30)|(DDR2_RD_DQS<<20)
+				|(DDR2_RD_DQS<<10)|(DDR2_RD_DQS<<0));
+	data.datardsratio1 = DDR2_RD_DQS>>2;
+	data.datawdsratio0 = ((DDR2_WR_DQS<<30)|(DDR2_WR_DQS<<20)
+				|(DDR2_WR_DQS<<10)|(DDR2_WR_DQS<<0));
+	data.datawdsratio1 = DDR2_WR_DQS>>2;
+	data.datawiratio0 = ((DDR2_PHY_WRLVL<<30)|(DDR2_PHY_WRLVL<<20)
+				|(DDR2_PHY_WRLVL<<10)|(DDR2_PHY_WRLVL<<0));
+	data.datawiratio1 = DDR2_PHY_WRLVL>>2;
+	data.datagiratio0 = ((DDR2_PHY_GATELVL<<30)|(DDR2_PHY_GATELVL<<20)
+				|(DDR2_PHY_GATELVL<<10)|(DDR2_PHY_GATELVL<<0));
+	data.datagiratio1 = DDR2_PHY_GATELVL>>2;
+	data.datafwsratio0 = ((DDR2_PHY_FIFO_WE<<30)|(DDR2_PHY_FIFO_WE<<20)
+				|(DDR2_PHY_FIFO_WE<<10)|(DDR2_PHY_FIFO_WE<<0));
+	data.datafwsratio1 = DDR2_PHY_FIFO_WE>>2;
+	data.datawrsratio0 = ((DDR2_PHY_WR_DATA<<30)|(DDR2_PHY_WR_DATA<<20)
+				|(DDR2_PHY_WR_DATA<<10)|(DDR2_PHY_WR_DATA<<0));
+	data.datawrsratio1 = DDR2_PHY_WR_DATA>>2;
+	data.datadldiff0 = PHY_DLL_LOCK_DIFF;
+
+	config_ddr_data(dataMacroNum, &data);
+}
+
+static void cmd_macro_config(void)
+{
+	struct cmd_control cmd;
+
+	cmd.cmd0csratio = DDR2_RATIO;
+	cmd.cmd0csforce = CMD_FORCE;
+	cmd.cmd0csdelay = CMD_DELAY;
+	cmd.cmd0dldiff = DDR2_DLL_LOCK_DIFF;
+	cmd.cmd0iclkout = DDR2_INVERT_CLKOUT;
+
+	cmd.cmd1csratio = DDR2_RATIO;
+	cmd.cmd1csforce = CMD_FORCE;
+	cmd.cmd1csdelay = CMD_DELAY;
+	cmd.cmd1dldiff = DDR2_DLL_LOCK_DIFF;
+	cmd.cmd1iclkout = DDR2_INVERT_CLKOUT;
+
+	cmd.cmd2csratio = DDR2_RATIO;
+	cmd.cmd2csforce = CMD_FORCE;
+	cmd.cmd2csdelay = CMD_DELAY;
+	cmd.cmd2dldiff = DDR2_DLL_LOCK_DIFF;
+	cmd.cmd2iclkout = DDR2_INVERT_CLKOUT;
+
+	config_cmd_ctrl(&cmd);
+
+}
+
+static void config_vtp(void)
+{
+	writel(readl(&vtpreg->vtp0ctrlreg) | VTP_CTRL_ENABLE,
+			&vtpreg->vtp0ctrlreg);
+	writel(readl(&vtpreg->vtp0ctrlreg) & (~VTP_CTRL_START_EN),
+			&vtpreg->vtp0ctrlreg);
+	writel(readl(&vtpreg->vtp0ctrlreg) | VTP_CTRL_START_EN,
+			&vtpreg->vtp0ctrlreg);
+
+	/* Poll for READY */
+	while ((readl(&vtpreg->vtp0ctrlreg) & VTP_CTRL_READY) !=
+			VTP_CTRL_READY)
+		;
+}
+
+static void config_emif_ddr2(void)
+{
+	int i;
+	int ret;
+	struct sdram_config cfg;
+	struct sdram_timing tmg;
+	struct ddr_phy_control phyc;
+
+	/*Program EMIF0 CFG Registers*/
+	phyc.reg = EMIF_READ_LATENCY;
+	phyc.reg_sh = EMIF_READ_LATENCY;
+	phyc.reg2 = EMIF_READ_LATENCY;
+
+	tmg.time1 = EMIF_TIM1;
+	tmg.time1_sh = EMIF_TIM1;
+	tmg.time2 = EMIF_TIM2;
+	tmg.time2_sh = EMIF_TIM2;
+	tmg.time3 = EMIF_TIM3;
+	tmg.time3_sh = EMIF_TIM3;
+
+	cfg.sdrcr = EMIF_SDCFG;
+	cfg.sdrcr2 = EMIF_SDCFG;
+	cfg.refresh = 0x00004650;
+	cfg.refresh_sh = 0x00004650;
+
+	/* Program EMIF instance */
+	ret = config_ddr_phy(&phyc);
+	if (ret < 0)
+		printf("Couldn't configure phyc\n");
+
+	ret = config_sdram(&cfg);
+	if (ret < 0)
+		printf("Couldn't configure SDRAM\n");
+
+	ret = set_sdram_timings(&tmg);
+	if (ret < 0)
+		printf("Couldn't configure timings\n");
+
+	/* Delay */
+	for (i = 0; i < 5000; i++)
+		;
+
+	cfg.refresh = EMIF_SDREF;
+	cfg.refresh_sh = EMIF_SDREF;
+	cfg.sdrcr = EMIF_SDCFG;
+	cfg.sdrcr2 = EMIF_SDCFG;
+
+	ret = config_sdram(&cfg);
+	if (ret < 0)
+		printf("Couldn't configure SDRAM\n");
+}
+
+void config_ddr(void)
+{
+	int data_macro_0 = 0;
+	int data_macro_1 = 1;
+	struct ddr_ioctrl ioctrl;
+
+	enable_emif_clocks();
+
+	config_vtp();
+
+	cmd_macro_config();
+
+	data_macro_config(data_macro_0);
+	data_macro_config(data_macro_1);
+
+	writel(PHY_RANK0_DELAY, &ddrregs->dt0rdelays0);
+	writel(PHY_RANK0_DELAY, &ddrregs->dt1rdelays0);
+
+	ioctrl.cmd1ctl = DDR_IOCTRL_VALUE;
+	ioctrl.cmd2ctl = DDR_IOCTRL_VALUE;
+	ioctrl.cmd3ctl = DDR_IOCTRL_VALUE;
+	ioctrl.data1ctl = DDR_IOCTRL_VALUE;
+	ioctrl.data2ctl = DDR_IOCTRL_VALUE;
+
+	config_io_ctrl(&ioctrl);
+
+	writel(readl(&ddrctrl->ddrioctrl) & 0xefffffff, &ddrctrl->ddrioctrl);
+	writel(readl(&ddrctrl->ddrckectrl) | 0x00000001, &ddrctrl->ddrckectrl);
+
+	config_emif_ddr2();
+}
+#endif
diff --git a/arch/arm/include/asm/arch-am33xx/ddr_defs.h b/arch/arm/include/asm/arch-am33xx/ddr_defs.h
new file mode 100644
index 0000000000..9638b4caa3
--- /dev/null
+++ b/arch/arm/include/asm/arch-am33xx/ddr_defs.h
@@ -0,0 +1,264 @@
+/*
+ * ddr_defs.h
+ *
+ * ddr specific header
+ *
+ * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
+ *
+ * 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.
+ */
+
+#ifndef _DDR_DEFS_H
+#define _DDR_DEFS_H
+
+#include <asm/arch/hardware.h>
+
+/* AM335X EMIF Register values */
+#define EMIF_SDMGT		0x80000000
+#define EMIF_SDRAM		0x00004650
+#define EMIF_PHYCFG		0x2
+#define DDR_PHY_RESET		(0x1 << 10)
+#define DDR_FUNCTIONAL_MODE_EN	0x1
+#define DDR_PHY_READY		(0x1 << 2)
+#define VTP_CTRL_READY		(0x1 << 5)
+#define VTP_CTRL_ENABLE		(0x1 << 6)
+#define VTP_CTRL_LOCK_EN	(0x1 << 4)
+#define VTP_CTRL_START_EN	(0x1)
+#define DDR2_RATIO		0x80
+#define CMD_FORCE		0x00
+#define CMD_DELAY		0x00
+
+#define EMIF_READ_LATENCY	0x04
+#define EMIF_TIM1		0x0666B3D6
+#define EMIF_TIM2		0x143731DA
+#define EMIF_TIM3		0x00000347
+#define EMIF_SDCFG		0x43805332
+#define EMIF_SDREF		0x0000081a
+#define DDR2_DLL_LOCK_DIFF	0x0
+#define DDR2_RD_DQS		0x12
+#define DDR2_PHY_FIFO_WE	0x80
+
+#define DDR2_INVERT_CLKOUT	0x00
+#define DDR2_WR_DQS		0x00
+#define DDR2_PHY_WRLVL		0x00
+#define DDR2_PHY_GATELVL	0x00
+#define DDR2_PHY_WR_DATA	0x40
+#define PHY_RANK0_DELAY		0x01
+#define PHY_DLL_LOCK_DIFF	0x0
+#define DDR_IOCTRL_VALUE	0x18B
+
+/**
+ * This structure represents the EMIF registers on AM33XX devices.
+ */
+struct emif_regs {
+	unsigned int sdrrev;		/* offset 0x00 */
+	unsigned int sdrstat;		/* offset 0x04 */
+	unsigned int sdrcr;		/* offset 0x08 */
+	unsigned int sdrcr2;		/* offset 0x0C */
+	unsigned int sdrrcr;		/* offset 0x10 */
+	unsigned int sdrrcsr;		/* offset 0x14 */
+	unsigned int sdrtim1;		/* offset 0x18 */
+	unsigned int sdrtim1sr;		/* offset 0x1C */
+	unsigned int sdrtim2;		/* offset 0x20 */
+	unsigned int sdrtim2sr;		/* offset 0x24 */
+	unsigned int sdrtim3;		/* offset 0x28 */
+	unsigned int sdrtim3sr;		/* offset 0x2C */
+	unsigned int res1[2];
+	unsigned int sdrmcr;		/* offset 0x38 */
+	unsigned int sdrmcsr;		/* offset 0x3C */
+	unsigned int res2[8];
+	unsigned int sdritr;		/* offset 0x60 */
+	unsigned int res3[20];
+	unsigned int ddrphycr;		/* offset 0xE4 */
+	unsigned int ddrphycsr;		/* offset 0xE8 */
+	unsigned int ddrphycr2;		/* offset 0xEC */
+};
+
+/**
+ * Encapsulates DDR PHY control and corresponding shadow registers.
+ */
+struct ddr_phy_control {
+	unsigned long	reg;
+	unsigned long	reg_sh;
+	unsigned long	reg2;
+};
+
+/**
+ * Encapsulates SDRAM timing and corresponding shadow registers.
+ */
+struct sdram_timing {
+	unsigned long	time1;
+	unsigned long	time1_sh;
+	unsigned long	time2;
+	unsigned long	time2_sh;
+	unsigned long	time3;
+	unsigned long	time3_sh;
+};
+
+/**
+ * Encapsulates SDRAM configuration.
+ * (Includes refresh control registers)  */
+struct sdram_config {
+	unsigned long	sdrcr;
+	unsigned long	sdrcr2;
+	unsigned long	refresh;
+	unsigned long	refresh_sh;
+};
+
+/**
+ * Configure SDRAM
+ */
+int config_sdram(struct sdram_config *cfg);
+
+/**
+ * Set SDRAM timings
+ */
+int set_sdram_timings(struct sdram_timing *val);
+
+/**
+ * Configure DDR PHY
+ */
+int config_ddr_phy(struct ddr_phy_control *cfg);
+
+/**
+ * This structure represents the DDR registers on AM33XX devices.
+ */
+struct ddr_regs {
+	unsigned int resv0[7];
+	unsigned int cm0csratio;	/* offset 0x01C */
+	unsigned int cm0csforce;	/* offset 0x020 */
+	unsigned int cm0csdelay;	/* offset 0x024 */
+	unsigned int cm0dldiff;		/* offset 0x028 */
+	unsigned int cm0iclkout;	/* offset 0x02C */
+	unsigned int resv1[8];
+	unsigned int cm1csratio;	/* offset 0x050 */
+	unsigned int cm1csforce;	/* offset 0x054 */
+	unsigned int cm1csdelay;	/* offset 0x058 */
+	unsigned int cm1dldiff;		/* offset 0x05C */
+	unsigned int cm1iclkout;	/* offset 0x060 */
+	unsigned int resv2[8];
+	unsigned int cm2csratio;	/* offset 0x084 */
+	unsigned int cm2csforce;	/* offset 0x088 */
+	unsigned int cm2csdelay;	/* offset 0x08C */
+	unsigned int cm2dldiff;		/* offset 0x090 */
+	unsigned int cm2iclkout;	/* offset 0x094 */
+	unsigned int resv3[12];
+	unsigned int dt0rdsratio0;	/* offset 0x0C8 */
+	unsigned int dt0rdsratio1;	/* offset 0x0CC */
+	unsigned int resv4[3];
+	unsigned int dt0wdsratio0;	/* offset 0x0DC */
+	unsigned int dt0wdsratio1;	/* offset 0x0E0 */
+	unsigned int resv5[3];
+	unsigned int dt0wiratio0;	/* offset 0x0F0 */
+	unsigned int dt0wiratio1;	/* offset 0x0F4 */
+	unsigned int dt0giratio0;	/* offset 0x0FC */
+	unsigned int dt0giratio1;	/* offset 0x100 */
+	unsigned int resv6[2];
+	unsigned int dt0fwsratio0;	/* offset 0x108 */
+	unsigned int dt0fwsratio1;	/* offset 0x10C */
+	unsigned int resv7[5];
+	unsigned int dt0wrsratio0;	/* offset 0x120 */
+	unsigned int dt0wrsratio1;	/* offset 0x124 */
+	unsigned int resv8[3];
+	unsigned int dt0rdelays0;	/* offset 0x134 */
+	unsigned int dt0dldiff0;	/* offset 0x138 */
+	unsigned int resv9[39];
+	unsigned int dt1rdelays0;	/* offset 0x1D8 */
+};
+
+/**
+ * Encapsulates DDR CMD control registers.
+ */
+struct cmd_control {
+	unsigned long cmd0csratio;
+	unsigned long cmd0csforce;
+	unsigned long cmd0csdelay;
+	unsigned long cmd0dldiff;
+	unsigned long cmd0iclkout;
+	unsigned long cmd1csratio;
+	unsigned long cmd1csforce;
+	unsigned long cmd1csdelay;
+	unsigned long cmd1dldiff;
+	unsigned long cmd1iclkout;
+	unsigned long cmd2csratio;
+	unsigned long cmd2csforce;
+	unsigned long cmd2csdelay;
+	unsigned long cmd2dldiff;
+	unsigned long cmd2iclkout;
+};
+
+/**
+ * Encapsulates DDR DATA registers.
+ */
+struct ddr_data {
+	unsigned long datardsratio0;
+	unsigned long datardsratio1;
+	unsigned long datawdsratio0;
+	unsigned long datawdsratio1;
+	unsigned long datawiratio0;
+	unsigned long datawiratio1;
+	unsigned long datagiratio0;
+	unsigned long datagiratio1;
+	unsigned long datafwsratio0;
+	unsigned long datafwsratio1;
+	unsigned long datawrsratio0;
+	unsigned long datawrsratio1;
+	unsigned long datadldiff0;
+};
+
+/**
+ * Configure DDR CMD control registers
+ */
+int config_cmd_ctrl(struct cmd_control *cmd);
+
+/**
+ * Configure DDR DATA registers
+ */
+int config_ddr_data(int data_macrono, struct ddr_data *data);
+
+/**
+ * This structure represents the DDR io control on AM33XX devices.
+ */
+struct ddr_cmdtctrl {
+	unsigned int resv1[1];
+	unsigned int cm0ioctl;
+	unsigned int cm1ioctl;
+	unsigned int cm2ioctl;
+	unsigned int resv2[12];
+	unsigned int dt0ioctl;
+	unsigned int dt1ioctl;
+};
+
+/**
+ * Encapsulates DDR CMD & DATA io control registers.
+ */
+struct ddr_ioctrl {
+	unsigned long cmd1ctl;
+	unsigned long cmd2ctl;
+	unsigned long cmd3ctl;
+	unsigned long data1ctl;
+	unsigned long data2ctl;
+};
+
+/**
+ * Configure DDR io control registers
+ */
+int config_io_ctrl(struct ddr_ioctrl *ioctrl);
+
+struct ddr_ctrl {
+	unsigned int ddrioctrl;
+	unsigned int resv1[325];
+	unsigned int ddrckectrl;
+};
+
+void config_ddr(void);
+
+#endif  /* _DDR_DEFS_H */
diff --git a/arch/arm/include/asm/arch-am33xx/sys_proto.h b/arch/arm/include/asm/arch-am33xx/sys_proto.h
new file mode 100644
index 0000000000..1e265c689f
--- /dev/null
+++ b/arch/arm/include/asm/arch-am33xx/sys_proto.h
@@ -0,0 +1,39 @@
+/*
+ * sys_proto.h
+ *
+ * System information header
+ *
+ * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
+ *
+ * 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.
+ */
+
+#ifndef _SYS_PROTO_H_
+#define _SYS_PROTO_H_
+
+#define BOARD_REV_ID	0x0
+struct {
+	u32 board_type_v1;
+	u32 board_type_v2;
+	u32 mtype;
+	char *board_string;
+	char *nand_string;
+} board_sysinfo;
+
+u32 get_cpu_rev(void);
+u32 get_sysboot_value(void);
+
+#ifdef CONFIG_DISPLAY_CPUINFO
+int print_cpuinfo(void);
+#endif
+
+u32 get_device_type(void);
+#endif