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authorSascha Hauer <s.hauer@pengutronix.de>2018-12-13 08:33:25 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2018-12-20 08:50:49 +0100
commitfe3441d9fdb1a3b362d054fdc836bc112a537d04 (patch)
tree59834415cb6917dcee3694ad555f9a9146223ea6 /arch/arm/mach-omap
parent076c6166b58bb2b2803b1efb47d9e4746608e27d (diff)
downloadbarebox-fe3441d9fdb1a3b362d054fdc836bc112a537d04.tar.gz
barebox-fe3441d9fdb1a3b362d054fdc836bc112a537d04.tar.xz
ARM: omap: Add emif4 support for AM3517
This adds support for the SDRAM controller found on AM3517. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-omap')
-rw-r--r--arch/arm/mach-omap/Makefile2
-rw-r--r--arch/arm/mach-omap/am35xx_emif4.c85
-rw-r--r--arch/arm/mach-omap/include/mach/emif4.h105
3 files changed, 191 insertions, 1 deletions
diff --git a/arch/arm/mach-omap/Makefile b/arch/arm/mach-omap/Makefile
index 901cc90373..36b2aa090e 100644
--- a/arch/arm/mach-omap/Makefile
+++ b/arch/arm/mach-omap/Makefile
@@ -22,7 +22,7 @@ pbl-$(CONFIG_ARCH_OMAP3) += omap3_generic.o auxcr.o
obj-$(CONFIG_ARCH_OMAP4) += omap4_generic.o omap4_clock.o
pbl-$(CONFIG_ARCH_OMAP4) += omap4_generic.o omap4_clock.o
obj-pbl-$(CONFIG_ARCH_AM33XX) += am33xx_generic.o am33xx_clock.o am33xx_mux.o am3xxx.o
-obj-pbl-$(CONFIG_ARCH_AM35XX) += am3xxx.o
+obj-pbl-$(CONFIG_ARCH_AM35XX) += am3xxx.o am35xx_emif4.o
obj-$(CONFIG_ARCH_AM33XX) += am33xx_scrm.o
obj-$(CONFIG_ARCH_OMAP3) += omap3_clock.o
pbl-$(CONFIG_ARCH_OMAP3) += omap3_clock.o
diff --git a/arch/arm/mach-omap/am35xx_emif4.c b/arch/arm/mach-omap/am35xx_emif4.c
new file mode 100644
index 0000000000..38fc0f02d2
--- /dev/null
+++ b/arch/arm/mach-omap/am35xx_emif4.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Author :
+ * Vaibhav Hiremath <hvaibhav@ti.com>
+ *
+ * Based on mem.c and sdrc.c
+ *
+ * Copyright (C) 2010
+ * Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+#include <common.h>
+#include <io.h>
+#include <mach/emif4.h>
+#include <mach/omap3-silicon.h>
+
+/*
+ * do_pac200_emif4_init -
+ * - Init the emif4 module for DDR access
+ * - Early init routines, called from flash or SRAM.
+ */
+void am35xx_emif4_init(void)
+{
+ unsigned int regval;
+ struct emif4 *emif4_base = IOMEM(OMAP3_SDRC_BASE);
+
+ /* 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);
+}
diff --git a/arch/arm/mach-omap/include/mach/emif4.h b/arch/arm/mach-omap/include/mach/emif4.h
new file mode 100644
index 0000000000..1f9c2938a1
--- /dev/null
+++ b/arch/arm/mach-omap/include/mach/emif4.h
@@ -0,0 +1,105 @@
+/*
+ * 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 (0x7 << 12) /* 8->7 */
+#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) /* 2? */
+#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 (0x15 << 4) /* 25->15 */
+#define EMIF4_TIM3_T_RAS_MAX (0xf) /* 7->f */
+
+#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 (0x257) /* 50f->257 */
+
+#define EMIF4_CFG_SDRAM_TYP (0x2 << 29)
+#define EMIF4_CFG_IBANK_POS (0x0 << 27)
+#define EMIF4_CFG_DDR_TERM (0x3 << 24) /* --> 0x3 */
+#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) /* --> 0x4: a0..a12 */
+#define EMIF4_CFG_IBANK (0x3 << 4)
+#define EMIF4_CFG_EBANK (0x0 << 3)
+#define EMIF4_CFG_PGSIZE (0x2) /* 10 columns */
+
+/*
+ * 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)
+
+struct emif4 {
+ unsigned int emif_mod_id_rev;
+ 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;
+};
+
+void am35xx_emif4_init(void);
+
+#endif /* endif _EMIF_H_ */