1 files changed, 85 insertions, 0 deletions
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);
+}