From b80ec768a3b27e245dbea3e4fac0a0d154e4b729 Mon Sep 17 00:00:00 2001 From: Jacky Bai Date: Fri, 29 Oct 2021 09:46:33 +0800 Subject: [PATCH] imx8ulp:ddr: saving the dram config timing data into sram On i.MX8ULP, The dram config timing need to be saved into sram for ddr retention when APD enter PD mode, so add this support on i.MX8ULP. Reviewed-by: Ye Li Signed-off-by: Jacky Bai Signed-off-by: Peng Fan --- drivers/ddr/imx/imx8ulp/Kconfig | 7 +++++ drivers/ddr/imx/imx8ulp/ddr_init.c | 45 ++++++++++++++++++++++++++++++ 2 files changed, 52 insertions(+) diff --git a/drivers/ddr/imx/imx8ulp/Kconfig b/drivers/ddr/imx/imx8ulp/Kconfig index e56062a1d0..42848863aa 100644 --- a/drivers/ddr/imx/imx8ulp/Kconfig +++ b/drivers/ddr/imx/imx8ulp/Kconfig @@ -8,4 +8,11 @@ config IMX8ULP_DRAM_PHY_PLL_BYPASS bool "Enable the DDR PHY PLL bypass mode, so PHY clock is from DDR_CLK " depends on IMX8ULP_DRAM +config SAVED_DRAM_TIMING_BASE + hex "Define the base address for saved dram timing" + help + The DRAM config timing data need to be saved into sram + for low power use. + default 0x2006c000 + endmenu diff --git a/drivers/ddr/imx/imx8ulp/ddr_init.c b/drivers/ddr/imx/imx8ulp/ddr_init.c index 16aaf56103..9730dd6450 100644 --- a/drivers/ddr/imx/imx8ulp/ddr_init.c +++ b/drivers/ddr/imx/imx8ulp/ddr_init.c @@ -178,6 +178,48 @@ int ddr_calibration(unsigned int fsp_table[3]) return 0; } +static void save_dram_config(struct dram_timing_info2 *timing_info, unsigned long saved_timing_base) +{ + int i = 0; + struct dram_timing_info2 *saved_timing = (struct dram_timing_info2 *)saved_timing_base; + struct dram_cfg_param *cfg; + + saved_timing->ctl_cfg_num = timing_info->ctl_cfg_num; + saved_timing->phy_f1_cfg_num = timing_info->phy_f1_cfg_num; + saved_timing->phy_f2_cfg_num = timing_info->phy_f2_cfg_num; + + /* save the fsp table */ + for (i = 0; i < 3; i++) + saved_timing->fsp_table[i] = timing_info->fsp_table[i]; + + cfg = (struct dram_cfg_param *)(saved_timing_base + + sizeof(*timing_info)); + + /* save ctl config */ + saved_timing->ctl_cfg = cfg; + for (i = 0; i < timing_info->ctl_cfg_num; i++) { + cfg->reg = timing_info->ctl_cfg[i].reg; + cfg->val = timing_info->ctl_cfg[i].val; + cfg++; + } + + /* save phy f1 config */ + saved_timing->phy_f1_cfg = cfg; + for (i = 0; i < timing_info->phy_f1_cfg_num; i++) { + cfg->reg = timing_info->phy_f1_cfg[i].reg; + cfg->val = timing_info->phy_f1_cfg[i].val; + cfg++; + } + + /* save phy f2 config */ + saved_timing->phy_f2_cfg = cfg; + for (i = 0; i < timing_info->phy_f2_cfg_num; i++) { + cfg->reg = timing_info->phy_f2_cfg[i].reg; + cfg->val = timing_info->phy_f2_cfg[i].val; + cfg++; + } +} + int ddr_init(struct dram_timing_info2 *dram_timing) { int i; @@ -192,6 +234,9 @@ int ddr_init(struct dram_timing_info2 *dram_timing) clrbits_le32(AVD_SIM_BASE_ADDR, 0x1); /* SIM_DDR_CTRL_DIV2_EN */ } + /* save the dram config into sram for low power mode */ + save_dram_config(dram_timing, CONFIG_SAVED_DRAM_TIMING_BASE); + /* Initialize CTL registers */ for (i = 0; i < dram_timing->ctl_cfg_num; i++) writel(dram_timing->ctl_cfg[i].val, (ulong)dram_timing->ctl_cfg[i].reg); -- 2.39.5