AM35x: Add support for EMIF4

This patch adds support for the EMIF4 interface
available in the AM35x processors.

Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Sanjeev Premi <premi@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

2 files changed, 169 insertions, 0 deletions

diff --git a/arch/arm/cpu/arm_cortexa8/omap3/Makefile b/arch/arm/cpu/arm_cortexa8/omap3/Makefile
index 1e80eb3..7d63c6b 100644
--- a/arch/arm/cpu/arm_cortexa8/omap3/Makefile
+++ b/arch/arm/cpu/arm_cortexa8/omap3/Makefile
@@ -37,6 +37,7 @@ COBJS	+= syslib.o
 COBJS	+= sys_info.o
 COBJS	+= timer.o
 
+COBJS-$(CONFIG_EMIF4)	+= emif4.o
 COBJS-$(CONFIG_SDRC)	+= sdrc.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/arch/arm/cpu/arm_cortexa8/omap3/emif4.c b/arch/arm/cpu/arm_cortexa8/omap3/emif4.c
new file mode 100644
index 0000000..fae5b11
--- /dev/null
+++ b/arch/arm/cpu/arm_cortexa8/omap3/emif4.c
@@ -0,0 +1,168 @@
+/*
+ * Author :
+ *     Vaibhav Hiremath <hvaibhav@ti.com>
+ *
+ * Based on mem.c and sdrc.c
+ *
+ * Copyright (C) 2010
+ * 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.
+ *
+ * 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 <asm/arch/mem.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/arch/emif4.h>
+
+extern omap3_sysinfo sysinfo;
+
+static emif4_t *emif4_base = (emif4_t *)OMAP34XX_SDRC_BASE;
+
+/*
+ * is_mem_sdr -
+ *  - Return 1 if mem type in use is SDR
+ */
+u32 is_mem_sdr(void)
+{
+	return 0;
+}
+
+/*
+ * get_sdr_cs_size -
+ *  - Get size of chip select 0/1
+ */
+u32 get_sdr_cs_size(u32 cs)
+{
+	u32 size;
+
+	/* TODO: Calculate the size based on EMIF4 configuration */
+	size = CONFIG_SYS_CS0_SIZE;
+
+	return size;
+}
+
+/*
+ * get_sdr_cs_offset -
+ *  - Get offset of cs from cs0 start
+ */
+u32 get_sdr_cs_offset(u32 cs)
+{
+	u32 offset = 0;
+
+	return offset;
+}
+
+/*
+ * do_emif4_init -
+ *  - Init the emif4 module for DDR access
+ *  - Early init routines, called from flash or SRAM.
+ */
+void do_emif4_init(void)
+{
+	unsigned int regval;
+	/* Set the DDR PHY parameters in PHY ctrl registers */
+	regval = (EMIF4_DDR1_READ_LAT | EMIF4_DDR1_PWRDN_DIS |
+		EMIF4_DDR1_EXT_STRB_DIS);
+	writel(regval, &emif4_base->ddr_phyctrl1);
+	writel(regval, &emif4_base->ddr_phyctrl1_shdw);
+	writel(0, &emif4_base->ddr_phyctrl2);
+
+	/* Reset the DDR PHY and wait till completed */
+	regval = readl(&emif4_base->sdram_iodft_tlgc);
+	regval |= (1<<10);
+	writel(regval, &emif4_base->sdram_iodft_tlgc);
+	/*Wait till that bit clears*/
+	while ((readl(&emif4_base->sdram_iodft_tlgc) & (1<<10)) == 0x1);
+	/*Re-verify the DDR PHY status*/
+	while ((readl(&emif4_base->sdram_sts) & (1<<2)) == 0x0);
+
+	regval |= (1<<0);
+	writel(regval, &emif4_base->sdram_iodft_tlgc);
+	/* Set SDR timing registers */
+	regval = (EMIF4_TIM1_T_WTR | EMIF4_TIM1_T_RRD |
+		EMIF4_TIM1_T_RC | EMIF4_TIM1_T_RAS |
+		EMIF4_TIM1_T_WR | EMIF4_TIM1_T_RCD |
+		EMIF4_TIM1_T_RP);
+	writel(regval, &emif4_base->sdram_time1);
+	writel(regval, &emif4_base->sdram_time1_shdw);
+
+	regval = (EMIF4_TIM2_T_CKE | EMIF4_TIM2_T_RTP |
+		EMIF4_TIM2_T_XSRD | EMIF4_TIM2_T_XSNR |
+		EMIF4_TIM2_T_ODT | EMIF4_TIM2_T_XP);
+	writel(regval, &emif4_base->sdram_time2);
+	writel(regval, &emif4_base->sdram_time2_shdw);
+
+	regval = (EMIF4_TIM3_T_RAS_MAX | EMIF4_TIM3_T_RFC);
+	writel(regval, &emif4_base->sdram_time3);
+	writel(regval, &emif4_base->sdram_time3_shdw);
+
+	/* Set the PWR control register */
+	regval = (EMIF4_PWR_PM_TIM | EMIF4_PWR_LP_MODE |
+		EMIF4_PWR_DPD_DIS | EMIF4_PWR_IDLE_MODE);
+	writel(regval, &emif4_base->sdram_pwr_mgmt);
+	writel(regval, &emif4_base->sdram_pwr_mgmt_shdw);
+
+	/* Set the DDR refresh rate control register */
+	regval = (EMIF4_REFRESH_RATE | EMIF4_INITREF_DIS);
+	writel(regval, &emif4_base->sdram_refresh_ctrl);
+	writel(regval, &emif4_base->sdram_refresh_ctrl_shdw);
+
+	/* set the SDRAM configuration register */
+	regval = (EMIF4_CFG_PGSIZE | EMIF4_CFG_EBANK |
+		EMIF4_CFG_IBANK | EMIF4_CFG_ROWSIZE |
+		EMIF4_CFG_CL | EMIF4_CFG_NARROW_MD |
+		EMIF4_CFG_SDR_DRV | EMIF4_CFG_DDR_DIS_DLL |
+		EMIF4_CFG_DDR2_DDQS | EMIF4_CFG_DDR_TERM |
+		EMIF4_CFG_IBANK_POS | EMIF4_CFG_SDRAM_TYP);
+	writel(regval, &emif4_base->sdram_config);
+}
+
+/*
+ * dram_init -
+ *  - Sets uboots idea of sdram size
+ */
+int dram_init(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	unsigned int size0 = 0, size1 = 0;
+
+	size0 = get_sdr_cs_size(CS0);
+	/*
+	 * If a second bank of DDR is attached to CS1 this is
+	 * where it can be started.  Early init code will init
+	 * memory on CS0.
+	 */
+	if ((sysinfo.mtype == DDR_COMBO) || (sysinfo.mtype == DDR_STACKED))
+		size1 = get_sdr_cs_size(CS1);
+
+	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
+	gd->bd->bi_dram[0].size = size0;
+	gd->bd->bi_dram[1].start = PHYS_SDRAM_1 + get_sdr_cs_offset(CS1);
+	gd->bd->bi_dram[1].size = size1;
+
+	return 0;
+}
+
+/*
+ * mem_init() -
+ *  - Initialize memory subsystem
+ */
+void mem_init(void)
+{
+	do_emif4_init();
+}