[U-Boot] [PATCH-V2 4/4] AM35x: Add support for EMIF4

hvaibhav at ti.com
2010-04-23T14:55:46Z

From: Vaibhav Hiremath <hvaibhav@ti.com>

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>
---
arch/arm/cpu/arm_cortexa8/omap3/Makefile | 3 +
arch/arm/cpu/arm_cortexa8/omap3/emif4.c | 168 +++++++++++++++++++++++++++
arch/arm/include/asm/arch-omap3/cpu.h | 24 ++++
arch/arm/include/asm/arch-omap3/emif4.h | 79 +++++++++++++
arch/arm/include/asm/arch-omap3/sys_proto.h | 3 +
5 files changed, 277 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/cpu/arm_cortexa8/omap3/emif4.c
create mode 100644 arch/arm/include/asm/arch-omap3/emif4.h

diff --git a/arch/arm/cpu/arm_cortexa8/omap3/Makefile b/arch/arm/cpu/arm_cortexa8/omap3/Makefile
index 8cc7802..0a23fa5 100644
--- a/arch/arm/cpu/arm_cortexa8/omap3/Makefile
+++ b/arch/arm/cpu/arm_cortexa8/omap3/Makefile
@@ -36,6 +36,9 @@ COBJS += mem.o
ifdef CONFIG_SDRC
COBJS += sdrc.o
endif
+ifdef CONFIG_EMIF4
+COBJS += emif4.o
+endif
COBJS += syslib.o
COBJS += sys_info.o
COBJS += timer.o
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..749a394
--- /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();
+}
diff --git a/arch/arm/include/asm/arch-omap3/cpu.h b/arch/arm/include/asm/arch-omap3/cpu.h
index a49af10..25668bd 100644
--- a/arch/arm/include/asm/arch-omap3/cpu.h
+++ b/arch/arm/include/asm/arch-omap3/cpu.h
@@ -217,6 +217,30 @@ struct sdrc {
struct sdrc_cs cs[2]; /* 0x80 || 0xB0 */
};

+#elif defined(CONFIG_EMIF4)
+/* EMIF4 */
+typedef struct emif4 {
+ unsigned int sdram_sts;
+ unsigned int sdram_config;
+ unsigned int res1;
+ unsigned int sdram_refresh_ctrl;
+ unsigned int sdram_refresh_ctrl_shdw;
+ unsigned int sdram_time1;
+ unsigned int sdram_time1_shdw;
+ unsigned int sdram_time2;
+ unsigned int sdram_time2_shdw;
+ unsigned int sdram_time3;
+ unsigned int sdram_time3_shdw;
+ unsigned char res2[8];
+ unsigned int sdram_pwr_mgmt;
+ unsigned int sdram_pwr_mgmt_shdw;
+ unsigned char res3[32];
+ unsigned int sdram_iodft_tlgc;
+ unsigned char res4[128];
+ unsigned int ddr_phyctrl1;
+ unsigned int ddr_phyctrl1_shdw;
+ unsigned int ddr_phyctrl2;
+} emif4_t;
#endif /* CONFIG_SDRC */
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL_STRICT_NAMES */
diff --git a/arch/arm/include/asm/arch-omap3/emif4.h b/arch/arm/include/asm/arch-omap3/emif4.h
new file mode 100644
index 0000000..579da0c
--- /dev/null
+++ b/arch/arm/include/asm/arch-omap3/emif4.h
@@ -0,0 +1,79 @@
+/*
+ * Auther:
+ * Vaibhav Hiremath <hvaibhav@ti.com>
+ *
+ * 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
+ */
+
+#ifndef _EMIF_H_
+#define _EMIF_H_
+
+/*
+ * Configuration values
+ */
+#define EMIF4_TIM1_T_RP (0x3 << 25)
+#define EMIF4_TIM1_T_RCD (0x3 << 21)
+#define EMIF4_TIM1_T_WR (0x3 << 17)
+#define EMIF4_TIM1_T_RAS (0x8 << 12)
+#define EMIF4_TIM1_T_RC (0xA << 6)
+#define EMIF4_TIM1_T_RRD (0x2 << 3)
+#define EMIF4_TIM1_T_WTR (0x2)
+
+#define EMIF4_TIM2_T_XP (0x2 << 28)
+#define EMIF4_TIM2_T_ODT (0x0 << 25)
+#define EMIF4_TIM2_T_XSNR (0x1C << 16)
+#define EMIF4_TIM2_T_XSRD (0xC8 << 6)
+#define EMIF4_TIM2_T_RTP (0x1 << 3)
+#define EMIF4_TIM2_T_CKE (0x2)
+
+#define EMIF4_TIM3_T_RFC (0x25 << 4)
+#define EMIF4_TIM3_T_RAS_MAX (0x7)
+
+#define EMIF4_PWR_IDLE_MODE (0x2 << 30)
+#define EMIF4_PWR_DPD_DIS (0x0 << 10)
+#define EMIF4_PWR_DPD_EN (0x1 << 10)
+#define EMIF4_PWR_LP_MODE (0x0 << 8)
+#define EMIF4_PWR_PM_TIM (0x0)
+
+#define EMIF4_INITREF_DIS (0x0 << 31)
+#define EMIF4_REFRESH_RATE (0x50F)
+
+#define EMIF4_CFG_SDRAM_TYP (0x2 << 29)
+#define EMIF4_CFG_IBANK_POS (0x0 << 27)
+#define EMIF4_CFG_DDR_TERM (0x0 << 24)
+#define EMIF4_CFG_DDR2_DDQS (0x1 << 23)
+#define EMIF4_CFG_DDR_DIS_DLL (0x0 << 20)
+#define EMIF4_CFG_SDR_DRV (0x0 << 18)
+#define EMIF4_CFG_NARROW_MD (0x0 << 14)
+#define EMIF4_CFG_CL (0x5 << 10)
+#define EMIF4_CFG_ROWSIZE (0x0 << 7)
+#define EMIF4_CFG_IBANK (0x3 << 4)
+#define EMIF4_CFG_EBANK (0x0 << 3)
+#define EMIF4_CFG_PGSIZE (0x2)
+
+/*
+ * EMIF4 PHY Control 1 register configuration
+ */
+#define EMIF4_DDR1_EXT_STRB_EN (0x1 << 7)
+#define EMIF4_DDR1_EXT_STRB_DIS (0x0 << 7)
+#define EMIF4_DDR1_PWRDN_DIS (0x0 << 6)
+#define EMIF4_DDR1_PWRDN_EN (0x1 << 6)
+#define EMIF4_DDR1_READ_LAT (0x6 << 0)
+
+#endif /* endif _EMIF_H_ */
diff --git a/arch/arm/include/asm/arch-omap3/sys_proto.h b/arch/arm/include/asm/arch-omap3/sys_proto.h
index 34e4e0d..7b425be 100644
--- a/arch/arm/include/asm/arch-omap3/sys_proto.h
+++ b/arch/arm/include/asm/arch-omap3/sys_proto.h
@@ -35,6 +35,9 @@ void memif_init(void);
void sdrc_init(void);
void do_sdrc_init(u32, u32);
#endif
+#if defined(CONFIG_EMIF4)
+void emif4_init(void);
+#endif
void gpmc_init(void);
void enable_gpmc_cs_config(const u32 *gpmc_config, struct gpmc_cs *cs, u32 base,
u32 size);
--
1.6.2.4