drivers: ddr: introduce DDR driver for i.MX8M
Introduce DDR driver for i.MX8M. The driver will be used by SPL to
initialze DDR PHY and DDR Controller.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/ddr/imx/imx8m/ddrphy_train.c b/drivers/ddr/imx/imx8m/ddrphy_train.c
new file mode 100644
index 0000000..18f7ed7
--- /dev/null
+++ b/drivers/ddr/imx/imx8m/ddrphy_train.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 NXP
+ */
+
+#include <common.h>
+#include <linux/kernel.h>
+#include <asm/arch/ddr.h>
+#include <asm/arch/lpddr4_define.h>
+
+void ddr_cfg_phy(struct dram_timing_info *dram_timing)
+{
+ struct dram_cfg_param *dram_cfg;
+ struct dram_fsp_msg *fsp_msg;
+ unsigned int num;
+ int i = 0;
+ int j = 0;
+
+ /* initialize PHY configuration */
+ dram_cfg = dram_timing->ddrphy_cfg;
+ num = dram_timing->ddrphy_cfg_num;
+ for (i = 0; i < num; i++) {
+ /* config phy reg */
+ dwc_ddrphy_apb_wr(dram_cfg->reg, dram_cfg->val);
+ dram_cfg++;
+ }
+
+ /* load the frequency setpoint message block config */
+ fsp_msg = dram_timing->fsp_msg;
+ for (i = 0; i < dram_timing->fsp_msg_num; i++) {
+ debug("DRAM PHY training for %dMTS\n", fsp_msg->drate);
+ /* set dram PHY input clocks to desired frequency */
+ ddrphy_init_set_dfi_clk(fsp_msg->drate);
+
+ /* load the dram training firmware image */
+ dwc_ddrphy_apb_wr(0xd0000, 0x0);
+ ddr_load_train_firmware(fsp_msg->fw_type);
+
+ /* load the frequency set point message block parameter */
+ dram_cfg = fsp_msg->fsp_cfg;
+ num = fsp_msg->fsp_cfg_num;
+ for (j = 0; j < num; j++) {
+ dwc_ddrphy_apb_wr(dram_cfg->reg, dram_cfg->val);
+ dram_cfg++;
+ }
+
+ /*
+ * -------------------- excute the firmware --------------------
+ * Running the firmware is a simply process to taking the
+ * PMU out of reset and stall, then the firwmare will be run
+ * 1. reset the PMU;
+ * 2. begin the excution;
+ * 3. wait for the training done;
+ * 4. read the message block result.
+ * -------------------------------------------------------------
+ */
+ dwc_ddrphy_apb_wr(0xd0000, 0x1);
+ dwc_ddrphy_apb_wr(0xd0099, 0x9);
+ dwc_ddrphy_apb_wr(0xd0099, 0x1);
+ dwc_ddrphy_apb_wr(0xd0099, 0x0);
+
+ /* Wait for the training firmware to complete */
+ wait_ddrphy_training_complete();
+
+ /* Halt the microcontroller. */
+ dwc_ddrphy_apb_wr(0xd0099, 0x1);
+
+ /* Read the Message Block results */
+ dwc_ddrphy_apb_wr(0xd0000, 0x0);
+ ddrphy_init_read_msg_block(fsp_msg->fw_type);
+ dwc_ddrphy_apb_wr(0xd0000, 0x1);
+
+ fsp_msg++;
+ }
+
+ /* Load PHY Init Engine Image */
+ dram_cfg = dram_timing->ddrphy_pie;
+ num = dram_timing->ddrphy_pie_num;
+ for (i = 0; i < num; i++) {
+ dwc_ddrphy_apb_wr(dram_cfg->reg, dram_cfg->val);
+ dram_cfg++;
+ }
+
+ /* save the ddr PHY trained CSR in memory for low power use */
+ ddrphy_trained_csr_save(ddrphy_trained_csr, ddrphy_trained_csr_num);
+}