feat(imx8m): add dram retention flow for imx8m family
Add the dram retention flow for i.MX8M SoC family.
Change-Id: Ifb8ba5b2f6f002133cf47c07fef73df29c51c890
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
diff --git a/plat/imx/imx8m/ddr/dram_retention.c b/plat/imx/imx8m/ddr/dram_retention.c
new file mode 100644
index 0000000..73eb8c4
--- /dev/null
+++ b/plat/imx/imx8m/ddr/dram_retention.c
@@ -0,0 +1,199 @@
+/*
+ * Copyright 2018-2022 NXP
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdbool.h>
+#include <lib/mmio.h>
+
+#include <dram.h>
+#include <platform_def.h>
+
+#define SRC_DDR1_RCR (IMX_SRC_BASE + 0x1000)
+#define SRC_DDR2_RCR (IMX_SRC_BASE + 0x1004)
+
+#define PU_PGC_UP_TRG 0xf8
+#define PU_PGC_DN_TRG 0x104
+#define GPC_PU_PWRHSK (IMX_GPC_BASE + 0x01FC)
+#define CCM_SRC_CTRL_OFFSET (IMX_CCM_BASE + 0x800)
+#define CCM_CCGR_OFFSET (IMX_CCM_BASE + 0x4000)
+#define CCM_SRC_CTRL(n) (CCM_SRC_CTRL_OFFSET + 0x10 * (n))
+#define CCM_CCGR(n) (CCM_CCGR_OFFSET + 0x10 * (n))
+
+#define DRAM_PLL_CTRL (IMX_ANAMIX_BASE + 0x50)
+
+#define DBGCAM_EMPTY 0x36000000
+
+void dram_enter_retention(void)
+{
+ /* Wait DBGCAM to be empty */
+ while (mmio_read_32(DDRC_DBGCAM(0)) != DBGCAM_EMPTY) {
+ ;
+ }
+
+ /* Block AXI ports from taking anymore transactions */
+ mmio_write_32(DDRC_PCTRL_0(0), 0x0);
+ /* Wait until all AXI ports are idle */
+ while (mmio_read_32(DDRC_PSTAT(0)) & 0x10001) {
+ ;
+ }
+
+ /* Enter self refresh */
+ mmio_write_32(DDRC_PWRCTL(0), 0xaa);
+
+ /* LPDDR4 & DDR4/DDR3L need to check different status */
+ if (dram_info.dram_type == DDRC_LPDDR4) {
+ while (0x223 != (mmio_read_32(DDRC_STAT(0)) & 0x33f)) {
+ ;
+ }
+ } else {
+ while (0x23 != (mmio_read_32(DDRC_STAT(0)) & 0x3f)) {
+ ;
+ }
+ }
+
+ mmio_write_32(DDRC_DFIMISC(0), 0x0);
+ mmio_write_32(DDRC_SWCTL(0), 0x0);
+ mmio_write_32(DDRC_DFIMISC(0), 0x1f00);
+ mmio_write_32(DDRC_DFIMISC(0), 0x1f20);
+
+ while (mmio_read_32(DDRC_DFISTAT(0)) & 0x1) {
+ ;
+ }
+
+ mmio_write_32(DDRC_DFIMISC(0), 0x1f00);
+ /* wait DFISTAT.dfi_init_complete to 1 */
+ while (!(mmio_read_32(DDRC_DFISTAT(0)) & 0x1)) {
+ ;
+ }
+
+ mmio_write_32(DDRC_SWCTL(0), 0x1);
+
+ /* should check PhyInLP3 pub reg */
+ dwc_ddrphy_apb_wr(0xd0000, 0x0);
+ if (!(dwc_ddrphy_apb_rd(0x90028) & 0x1)) {
+ INFO("PhyInLP3 = 1\n");
+ }
+ dwc_ddrphy_apb_wr(0xd0000, 0x1);
+
+#if defined(PLAT_imx8mq)
+ /* pwrdnreqn_async adbm/adbs of ddr */
+ mmio_clrbits_32(GPC_PU_PWRHSK, BIT(1));
+ while (mmio_read_32(GPC_PU_PWRHSK) & BIT(18)) {
+ ;
+ }
+ mmio_setbits_32(GPC_PU_PWRHSK, BIT(1));
+#else
+ /* pwrdnreqn_async adbm/adbs of ddr */
+ mmio_clrbits_32(GPC_PU_PWRHSK, BIT(2));
+ while (mmio_read_32(GPC_PU_PWRHSK) & BIT(20)) {
+ ;
+ }
+ mmio_setbits_32(GPC_PU_PWRHSK, BIT(2));
+#endif
+ /* remove PowerOk */
+ mmio_write_32(SRC_DDR1_RCR, 0x8F000008);
+
+ mmio_write_32(CCM_CCGR(5), 0);
+ mmio_write_32(CCM_SRC_CTRL(15), 2);
+
+ /* enable the phy iso */
+ mmio_setbits_32(IMX_GPC_BASE + 0xd40, 1);
+ mmio_setbits_32(IMX_GPC_BASE + PU_PGC_DN_TRG, BIT(5));
+
+ VERBOSE("dram enter retention\n");
+}
+
+void dram_exit_retention(void)
+{
+ VERBOSE("dram exit retention\n");
+ /* assert all reset */
+#if defined(PLAT_imx8mq)
+ mmio_write_32(SRC_DDR2_RCR, 0x8F000003);
+ mmio_write_32(SRC_DDR1_RCR, 0x8F00000F);
+ mmio_write_32(SRC_DDR2_RCR, 0x8F000000);
+#else
+ mmio_write_32(SRC_DDR1_RCR, 0x8F00001F);
+ mmio_write_32(SRC_DDR1_RCR, 0x8F00000F);
+#endif
+ mmio_write_32(CCM_CCGR(5), 2);
+ mmio_write_32(CCM_SRC_CTRL(15), 2);
+
+ /* disable iso */
+ mmio_setbits_32(IMX_GPC_BASE + PU_PGC_UP_TRG, BIT(5));
+ mmio_write_32(SRC_DDR1_RCR, 0x8F000006);
+
+ /* wait dram pll locked */
+ while (!(mmio_read_32(DRAM_PLL_CTRL) & BIT(31))) {
+ ;
+ }
+
+ /* ddrc re-init */
+ dram_umctl2_init(dram_info.timing_info);
+
+ /*
+ * Skips the DRAM init routine and starts up in selfrefresh mode
+ * Program INIT0.skip_dram_init = 2'b11
+ */
+ mmio_setbits_32(DDRC_INIT0(0), 0xc0000000);
+ /* Keeps the controller in self-refresh mode */
+ mmio_write_32(DDRC_PWRCTL(0), 0xaa);
+ mmio_write_32(DDRC_DBG1(0), 0x0);
+ mmio_write_32(SRC_DDR1_RCR, 0x8F000004);
+ mmio_write_32(SRC_DDR1_RCR, 0x8F000000);
+
+ /* before write Dynamic reg, sw_done should be 0 */
+ mmio_write_32(DDRC_SWCTL(0), 0x0);
+ if (dram_info.dram_type == DDRC_LPDDR4) {
+ mmio_write_32(DDRC_DDR_SS_GPR0, 0x01); /*LPDDR4 mode */
+ }
+ mmio_write_32(DDRC_DFIMISC(0), 0x0);
+
+ /* dram phy re-init */
+ dram_phy_init(dram_info.timing_info);
+
+ /* DWC_DDRPHYA_APBONLY0_MicroContMuxSel */
+ dwc_ddrphy_apb_wr(0xd0000, 0x0);
+ while (dwc_ddrphy_apb_rd(0x20097)) {
+ ;
+ }
+ dwc_ddrphy_apb_wr(0xd0000, 0x1);
+
+ /* before write Dynamic reg, sw_done should be 0 */
+ mmio_write_32(DDRC_SWCTL(0), 0x0);
+ mmio_write_32(DDRC_DFIMISC(0), 0x20);
+ /* wait DFISTAT.dfi_init_complete to 1 */
+ while (!(mmio_read_32(DDRC_DFISTAT(0)) & 0x1)) {
+ ;
+ }
+
+ /* clear DFIMISC.dfi_init_start */
+ mmio_write_32(DDRC_DFIMISC(0), 0x0);
+ /* set DFIMISC.dfi_init_complete_en */
+ mmio_write_32(DDRC_DFIMISC(0), 0x1);
+
+ /* set SWCTL.sw_done to enable quasi-dynamic register programming */
+ mmio_write_32(DDRC_SWCTL(0), 0x1);
+ /* wait SWSTAT.sw_done_ack to 1 */
+ while (!(mmio_read_32(DDRC_SWSTAT(0)) & 0x1)) {
+ ;
+ }
+
+ mmio_write_32(DDRC_PWRCTL(0), 0x88);
+ /* wait STAT to normal state */
+ while (0x1 != (mmio_read_32(DDRC_STAT(0)) & 0x7)) {
+ ;
+ }
+
+ mmio_write_32(DDRC_PCTRL_0(0), 0x1);
+ /* dis_auto-refresh is set to 0 */
+ mmio_write_32(DDRC_RFSHCTL3(0), 0x0);
+
+ /* should check PhyInLP3 pub reg */
+ dwc_ddrphy_apb_wr(0xd0000, 0x0);
+ if (!(dwc_ddrphy_apb_rd(0x90028) & 0x1)) {
+ VERBOSE("PHYInLP3 = 0\n");
+ }
+ dwc_ddrphy_apb_wr(0xd0000, 0x1);
+}