[Patch V3 42/44] ddr: Add DDR driver for iMX8ULP

Peng Fan (OSS)
2021-07-19T07:21:22Z

From: Ye Li <ye.li@nxp.com>

Add iMX8ULP DDR initialization driver which loads the DDR timing
parameters and executes the training procedure.

When enabling IMX8ULP_DRAM_PHY_PLL_BYPASS, using PHY PLL bypass mode
to do DDR init

Signed-off-by: Ye Li <ye.li@nxp.com>
---
drivers/Makefile | 1 +
drivers/ddr/imx/Kconfig | 1 +
drivers/ddr/imx/imx8ulp/Kconfig | 11 ++
drivers/ddr/imx/imx8ulp/Makefile | 9 ++
drivers/ddr/imx/imx8ulp/ddr_init.c | 217 +++++++++++++++++++++++++++++
5 files changed, 239 insertions(+)
create mode 100644 drivers/ddr/imx/imx8ulp/Kconfig
create mode 100644 drivers/ddr/imx/imx8ulp/Makefile
create mode 100644 drivers/ddr/imx/imx8ulp/ddr_init.c

diff --git a/drivers/Makefile b/drivers/Makefile
index 4081289104..54815a2d80 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_ARMADA_38X) += ddr/marvell/a38x/
obj-$(CONFIG_ARMADA_XP) += ddr/marvell/axp/
obj-$(CONFIG_$(SPL_)ALTERA_SDRAM) += ddr/altera/
obj-$(CONFIG_ARCH_IMX8M) += ddr/imx/imx8m/
+obj-$(CONFIG_IMX8ULP_DRAM) += ddr/imx/imx8ulp/
obj-$(CONFIG_SPL_POWER_SUPPORT) += power/ power/pmic/
obj-$(CONFIG_SPL_POWER_SUPPORT) += power/regulator/
obj-$(CONFIG_SPL_POWER_DOMAIN) += power/domain/
diff --git a/drivers/ddr/imx/Kconfig b/drivers/ddr/imx/Kconfig
index 7e06fb2f7d..179f34530d 100644
--- a/drivers/ddr/imx/Kconfig
+++ b/drivers/ddr/imx/Kconfig
@@ -1 +1,2 @@
source "drivers/ddr/imx/imx8m/Kconfig"
+source "drivers/ddr/imx/imx8ulp/Kconfig"
diff --git a/drivers/ddr/imx/imx8ulp/Kconfig b/drivers/ddr/imx/imx8ulp/Kconfig
new file mode 100644
index 0000000000..e56062a1d0
--- /dev/null
+++ b/drivers/ddr/imx/imx8ulp/Kconfig
@@ -0,0 +1,11 @@
+menu "i.MX8ULP DDR controllers"
+ depends on ARCH_IMX8ULP
+
+config IMX8ULP_DRAM
+ bool "imx8m dram"
+
+config IMX8ULP_DRAM_PHY_PLL_BYPASS
+ bool "Enable the DDR PHY PLL bypass mode, so PHY clock is from DDR_CLK "
+ depends on IMX8ULP_DRAM
+
+endmenu
diff --git a/drivers/ddr/imx/imx8ulp/Makefile b/drivers/ddr/imx/imx8ulp/Makefile
new file mode 100644
index 0000000000..7f44a92180
--- /dev/null
+++ b/drivers/ddr/imx/imx8ulp/Makefile
@@ -0,0 +1,9 @@
+#
+# Copyright 2021 NXP
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+ifdef CONFIG_SPL_BUILD
+obj-$(CONFIG_IMX8ULP_DRAM) += ddr_init.o
+endif
diff --git a/drivers/ddr/imx/imx8ulp/ddr_init.c b/drivers/ddr/imx/imx8ulp/ddr_init.c
new file mode 100644
index 0000000000..16aaf56103
--- /dev/null
+++ b/drivers/ddr/imx/imx8ulp/ddr_init.c
@@ -0,0 +1,217 @@
+// SPDX-License-Identifier: GPL-2.0+ OR MIT
+/*
+ * Copyright 2021 NXP
+ */
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/ddr.h>
+#include <asm/arch/imx-regs.h>
+
+#define DENALI_CTL_00 (DDR_CTL_BASE_ADDR + 4 * 0)
+#define CTL_START 0x1
+
+#define DENALI_CTL_03 (DDR_CTL_BASE_ADDR + 4 * 3)
+#define DENALI_CTL_197 (DDR_CTL_BASE_ADDR + 4 * 197)
+#define DENALI_CTL_250 (DDR_CTL_BASE_ADDR + 4 * 250)
+#define DENALI_CTL_251 (DDR_CTL_BASE_ADDR + 4 * 251)
+#define DENALI_CTL_266 (DDR_CTL_BASE_ADDR + 4 * 266)
+#define DFI_INIT_COMPLETE 0x2
+
+#define DENALI_CTL_614 (DDR_CTL_BASE_ADDR + 4 * 614)
+#define DENALI_CTL_615 (DDR_CTL_BASE_ADDR + 4 * 615)
+
+#define DENALI_PI_00 (DDR_PI_BASE_ADDR + 4 * 0)
+#define PI_START 0x1
+
+#define DENALI_PI_04 (DDR_PI_BASE_ADDR + 4 * 4)
+#define DENALI_PI_11 (DDR_PI_BASE_ADDR + 4 * 11)
+#define DENALI_PI_12 (DDR_PI_BASE_ADDR + 4 * 12)
+#define DENALI_CTL_23 (DDR_CTL_BASE_ADDR + 4 * 23)
+#define DENALI_CTL_25 (DDR_CTL_BASE_ADDR + 4 * 25)
+
+#define DENALI_PHY_1624 (DDR_PHY_BASE_ADDR + 4 * 1624)
+#define DENALI_PHY_1537 (DDR_PHY_BASE_ADDR + 4 * 1537)
+#define PHY_FREQ_SEL_MULTICAST_EN(X) ((X) << 8)
+#define PHY_FREQ_SEL_INDEX(X) ((X) << 16)
+
+#define DENALI_PHY_1547 (DDR_PHY_BASE_ADDR + 4 * 1547)
+#define DENALI_PHY_1555 (DDR_PHY_BASE_ADDR + 4 * 1555)
+#define DENALI_PHY_1564 (DDR_PHY_BASE_ADDR + 4 * 1564)
+#define DENALI_PHY_1565 (DDR_PHY_BASE_ADDR + 4 * 1565)
+
+static void ddr_enable_pll_bypass(void)
+{
+ u32 reg_val;
+
+ /* PI_INIT_LVL_EN=0x0 (DENALI_PI_04) */
+ reg_val = readl(DENALI_PI_04) & ~0x1;
+ writel(reg_val, DENALI_PI_04);
+
+ /* PI_FREQ_MAP=0x1 (DENALI_PI_12) */
+ writel(0x1, DENALI_PI_12);
+
+ /* PI_INIT_WORK_FREQ=0x0 (DENALI_PI_11) */
+ reg_val = readl(DENALI_PI_11) & ~(0x1f << 8);
+ writel(reg_val, DENALI_PI_11);
+
+ /* DFIBUS_FREQ_INIT=0x0 (DENALI_CTL_23) */
+ reg_val = readl(DENALI_CTL_23) & ~(0x3 << 24);
+ writel(reg_val, DENALI_CTL_23);
+
+ /* PHY_LP4_BOOT_DISABLE=0x0 (DENALI_PHY_1547) */
+ reg_val = readl(DENALI_PHY_1547) & ~(0x1 << 8);
+ writel(reg_val, DENALI_PHY_1547);
+
+ /* PHY_PLL_BYPASS=0x1 (DENALI_PHY_1624) */
+ reg_val = readl(DENALI_PHY_1624) | 0x1;
+ writel(reg_val, DENALI_PHY_1624);
+
+ /* PHY_LP4_BOOT_PLL_BYPASS to 0x1 (DENALI_PHY_1555) */
+ reg_val = readl(DENALI_PHY_1555) | 0x1;
+ writel(reg_val, DENALI_PHY_1555);
+
+ /* FREQ_CHANGE_TYPE_F0 = 0x0/FREQ_CHANGE_TYPE_F1 = 0x1/FREQ_CHANGE_TYPE_F2 = 0x2 */
+ reg_val = 0x020100;
+ writel(reg_val, DENALI_CTL_25);
+}
+
+int ddr_calibration(unsigned int fsp_table[3])
+{
+ u32 reg_val;
+ u32 int_status_init, phy_freq_req, phy_freq_type;
+ u32 lock_0, lock_1, lock_2;
+ u32 freq_chg_pt, freq_chg_cnt;
+
+ if (IS_ENABLED(CONFIG_IMX8ULP_DRAM_PHY_PLL_BYPASS)) {
+ ddr_enable_pll_bypass();
+ freq_chg_cnt = 0;
+ freq_chg_pt = 0;
+ } else {
+ reg_val = readl(DENALI_CTL_250);
+ if (((reg_val >> 16) & 0x3) == 1)
+ freq_chg_cnt = 2;
+ else
+ freq_chg_cnt = 3;
+
+ reg_val = readl(DENALI_PI_12);
+ if (reg_val == 0x3) {
+ freq_chg_pt = 1;
+ } else if (reg_val == 0x7) {
+ freq_chg_pt = 2;
+ } else {
+ printf("frequency map(0x%x) is wrong, please check!\r\n", reg_val);
+ return -1;
+ }
+ }
+
+ /* Assert PI_START parameter and then assert START parameter in Controller. */
+ reg_val = readl(DENALI_PI_00) | PI_START;
+ writel(reg_val, DENALI_PI_00);
+
+ reg_val = readl(DENALI_CTL_00) | CTL_START;
+ writel(reg_val, DENALI_CTL_00);
+
+ /* Poll for init_done_bit in Controller interrupt status register (INT_STATUS_INIT) */
+ do {
+ if (!freq_chg_cnt) {
+ int_status_init = (readl(DENALI_CTL_266) >> 8) & 0xff;
+ /* DDR subsystem is ready for traffic. */
+ if (int_status_init & DFI_INIT_COMPLETE) {
+ debug("complete\n");
+ break;
+ }
+ }
+
+ /*
+ * During leveling, PHY will request for freq change and SoC clock logic
+ * should provide requested frequency
+ * Polling SIM LPDDR_CTRL2 Bit phy_freq_chg_req until be 1'b1
+ */
+ reg_val = readl(AVD_SIM_LPDDR_CTRL2);
+ phy_freq_req = (reg_val >> 7) & 0x1;
+
+ if (phy_freq_req) {
+ phy_freq_type = reg_val & 0x1F;
+ if (phy_freq_type == 0x00) {
+ debug("Poll for freq_chg_req on SIM register and change to F0 frequency.\n");
+ set_ddr_clk(fsp_table[phy_freq_type] >> 1);
+
+ /* Write 1'b1 at LPDDR_CTRL2 bit phy_freq_cfg_ack */
+ reg_val = readl(AVD_SIM_LPDDR_CTRL2);
+ writel(reg_val | (0x1 << 6), AVD_SIM_LPDDR_CTRL2);
+ } else if (phy_freq_type == 0x01) {
+ debug("Poll for freq_chg_req on SIM register and change to F1 frequency.\n");
+ set_ddr_clk(fsp_table[phy_freq_type] >> 1);
+
+ /* Write 1'b1 at LPDDR_CTRL2 bit phy_freq_cfg_ack */
+ reg_val = readl(AVD_SIM_LPDDR_CTRL2);
+ writel(reg_val | (0x1 << 6), AVD_SIM_LPDDR_CTRL2);
+ if (freq_chg_pt == 1)
+ freq_chg_cnt--;
+ } else if (phy_freq_type == 0x02) {
+ debug("Poll for freq_chg_req on SIM register and change to F2 frequency.\n");
+ set_ddr_clk(fsp_table[phy_freq_type] >> 1);
+
+ /* Write 1'b1 at LPDDR_CTRL2 bit phy_freq_cfg_ack */
+ reg_val = readl(AVD_SIM_LPDDR_CTRL2);
+ writel(reg_val | (0x1 << 6), AVD_SIM_LPDDR_CTRL2);
+ if (freq_chg_pt == 2)
+ freq_chg_cnt--;
+ }
+ reg_val = readl(AVD_SIM_LPDDR_CTRL2);
+ }
+ } while (1);
+
+ /* Check PLL lock status */
+ lock_0 = readl(DENALI_PHY_1564) & 0xffff;
+ lock_1 = (readl(DENALI_PHY_1564) >> 16) & 0xffff;
+ lock_2 = readl(DENALI_PHY_1565) & 0xffff;
+
+ if ((lock_0 & 0x3) != 0x3 || (lock_1 & 0x3) != 0x3 || (lock_2 & 0x3) != 0x3) {
+ debug("De-Skew PLL failed to lock\n");
+ debug("lock_0=0x%x, lock_1=0x%x, lock_2=0x%x\n", lock_0, lock_1, lock_2);
+ return -1;
+ }
+
+ debug("De-Skew PLL is locked and ready\n");
+ return 0;
+}
+
+int ddr_init(struct dram_timing_info2 *dram_timing)
+{
+ int i;
+
+ if (IS_ENABLED(CONFIG_IMX8ULP_DRAM_PHY_PLL_BYPASS)) {
+ /* Use PLL bypass for boot freq */
+ /* Since PLL can't generate the double freq, Need ddr clock to generate it. */
+ set_ddr_clk(dram_timing->fsp_table[0]); /* Set to boot freq */
+ setbits_le32(AVD_SIM_BASE_ADDR, 0x1); /* SIM_DDR_CTRL_DIV2_EN */
+ } else {
+ set_ddr_clk(dram_timing->fsp_table[0] >> 1); /* Set to boot freq */
+ clrbits_le32(AVD_SIM_BASE_ADDR, 0x1); /* SIM_DDR_CTRL_DIV2_EN */
+ }
+
+ /* 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);
+
+ /* Initialize PI registers */
+ for (i = 0; i < dram_timing->pi_cfg_num; i++)
+ writel(dram_timing->pi_cfg[i].val, (ulong)dram_timing->pi_cfg[i].reg);
+
+ /* Write PHY regiters for all 3 frequency points (48Mhz/384Mhz/528Mhz): f1_index=0 */
+ writel(PHY_FREQ_SEL_MULTICAST_EN(1) | PHY_FREQ_SEL_INDEX(0), DENALI_PHY_1537);
+ for (i = 0; i < dram_timing->phy_f1_cfg_num; i++)
+ writel(dram_timing->phy_f1_cfg[i].val, (ulong)dram_timing->phy_f1_cfg[i].reg);
+
+ /* Write PHY regiters for freqency point 2 (528Mhz): f2_index=1 */
+ writel(PHY_FREQ_SEL_MULTICAST_EN(0) | PHY_FREQ_SEL_INDEX(1), DENALI_PHY_1537);
+ for (i = 0; i < dram_timing->phy_f2_cfg_num; i++)
+ writel(dram_timing->phy_f2_cfg[i].val, (ulong)dram_timing->phy_f2_cfg[i].reg);
+
+ /* Re-enable MULTICAST mode */
+ writel(PHY_FREQ_SEL_MULTICAST_EN(1) | PHY_FREQ_SEL_INDEX(0), DENALI_PHY_1537);
+
+ return ddr_calibration(dram_timing->fsp_table);
+}
--
2.30.0