soc/mediatek/mt8192: Do dramc software impedance calibration

Signed-off-by: Huayang Duan <huayang.duan@mediatek.com>
Change-Id: I2c6ffe885717997540a0a9721310e355a3b6a87d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44704
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

3 files changed, 174 insertions, 1 deletions

diff --git a/src/soc/mediatek/mt8192/Makefile.inc b/src/soc/mediatek/mt8192/Makefile.inc
index 1f70e4318e..a81e5329f0 100644
--- a/src/soc/mediatek/mt8192/Makefile.inc
+++ b/src/soc/mediatek/mt8192/Makefile.inc
@@ -25,7 +25,7 @@ verstage-y += ../common/uart.c
 
 romstage-y += ../common/auxadc.c
 romstage-y += ../common/cbmem.c
-romstage-y += dramc_pi_main.c dramc_pi_basic_api.c dramc_utility.c
+romstage-y += dramc_pi_main.c dramc_pi_basic_api.c dramc_pi_calibration_api.c dramc_utility.c
 romstage-y += emi.c
 romstage-y += flash_controller.c
 romstage-y += ../common/gpio.c gpio.c
diff --git a/src/soc/mediatek/mt8192/dramc_pi_calibration_api.c b/src/soc/mediatek/mt8192/dramc_pi_calibration_api.c
new file mode 100644
index 0000000000..93988b957c
--- /dev/null
+++ b/src/soc/mediatek/mt8192/dramc_pi_calibration_api.c
@@ -0,0 +1,170 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <soc/dramc_pi_api.h>
+#include <soc/dramc_register.h>
+
+static const u8 imp_vref_sel[ODT_MAX][IMP_DRV_MAX] = {
+	/* DRVP  DRVN  ODTP  ODTN */
+	[ODT_OFF] = {0x37, 0x33, 0x00, 0x37},
+	[ODT_ON] = {0x3a, 0x33, 0x00, 0x3a},
+};
+
+static void dramc_imp_cal_vref_sel(dram_odt_state odt, imp_drv_type drv_type)
+{
+	u8 vref_tmp = imp_vref_sel[odt][drv_type];
+
+	switch (drv_type) {
+	case DRVP:
+		SET32_BITFIELDS(&ch[0].phy_ao.shu_ca_cmd12,
+			SHU_CA_CMD12_RG_RIMP_VREF_SEL_DRVP, vref_tmp);
+		break;
+	case DRVN:
+		SET32_BITFIELDS(&ch[0].phy_ao.shu_ca_cmd12,
+			SHU_CA_CMD12_RG_RIMP_VREF_SEL_DRVN, vref_tmp);
+		break;
+	case ODTN:
+		SET32_BITFIELDS(&ch[0].phy_ao.shu_ca_cmd12,
+			SHU_CA_CMD12_RG_RIMP_VREF_SEL_ODTN, vref_tmp);
+		break;
+	default:
+		die("Can't support drv_type %d\n", drv_type);
+		break;
+	}
+}
+
+static u32 dramc_sw_imp_cal_result(imp_drv_type drv_type)
+{
+	u32 drive = 0, cal_res = 0;
+	u32 change = (drv_type == DRVP) ? 1 : 0;
+
+	static const char *const drv_type_str[IMP_DRV_MAX] = {
+		[DRVP] = "DRVP",
+		[DRVN] = "DRVN",
+		[ODTP] = "ODTP",
+		[ODTN] = "ODTN",
+	};
+	if (drv_type >= IMP_DRV_MAX)
+		die("Can't support drv_type %d", drv_type);
+
+	const char *drv_str = drv_type_str[drv_type];
+
+	for (drive = 0; drive < 32; drive++) {
+		if (drv_type == DRVP)
+			SET32_BITFIELDS(&ch[0].phy_ao.shu_misc_impcal1,
+				SHU_MISC_IMPCAL1_IMPDRVP, drive);
+		else if (drv_type == DRVN || drv_type == ODTN)
+			SET32_BITFIELDS(&ch[0].phy_ao.shu_misc_impcal1,
+				SHU_MISC_IMPCAL1_IMPDRVN, drive);
+
+		udelay(1);
+		cal_res = READ32_BITFIELD(&ch[0].phy_nao.misc_phy_rgs_cmd,
+				MISC_PHY_RGS_CMD_RGS_RIMPCALOUT);
+		dramc_dbg("OCD %s=%d ,CALOUT=%d\n", drv_str, drive, cal_res);
+
+		if (cal_res == change) {
+			dramc_info("%s calibration passed! result=%d\n", drv_str, drive);
+			break;
+		}
+	}
+
+	if (drive == 32) {
+		drive = 31;
+		dramc_err("OCD %s calibration failed! %s=%d\n", drv_str, drv_str, drive);
+	}
+
+	return drive;
+}
+
+void dramc_sw_impedance_cal(dram_odt_state odt, struct dram_impedance *imp)
+{
+	const u8 chn = 0;
+	u8 i_chn, enp, enn;
+	u32 bc_bak, impcal_bak, cal_res;
+	u32 drvp_result = 0xff, odtn_result = 0xff, drvn_result = 0xff;
+
+	bc_bak = dramc_get_broadcast();
+	dramc_set_broadcast(DRAMC_BROADCAST_OFF);
+	for (i_chn = 0; i_chn < CHANNEL_MAX; i_chn++) {
+		SET32_BITFIELDS(&ch[i_chn].phy_ao.misc_lp_ctrl,
+			MISC_LP_CTRL_RG_ARDMSUS_10, 0x0,
+			MISC_LP_CTRL_RG_ARDMSUS_10_LP_SEL, 0x0,
+			MISC_LP_CTRL_RG_RIMP_DMSUS_10, 0x0,
+			MISC_LP_CTRL_RG_RIMP_DMSUS_10_LP_SEL, 0x0);
+		SET32_BITFIELDS(&ch[i_chn].phy_ao.misc_impcal, MISC_IMPCAL_IMPCAL_HW, 0);
+	}
+
+	impcal_bak = read32(&ch[chn].phy_ao.misc_impcal);
+	SET32_BITFIELDS(&ch[chn].phy_ao.misc_imp_ctrl1, MISC_IMP_CTRL1_RG_RIMP_PRE_EN, 0);
+	SET32_BITFIELDS(&ch[chn].phy_ao.misc_impcal,
+		MISC_IMPCAL_IMPCAL_CALI_ENN, 0,
+		MISC_IMPCAL_IMPCAL_IMPPDP, 1,
+		MISC_IMPCAL_IMPCAL_IMPPDN, 1);
+	SET32_BITFIELDS(&ch[chn].phy_ao.misc_imp_ctrl1,
+		MISC_IMP_CTRL1_RG_IMP_EN, 1,
+		MISC_IMP_CTRL1_RG_RIMP_DDR3_SEL, 0,
+		MISC_IMP_CTRL1_RG_RIMP_VREF_EN, 1,
+		MISC_IMP_CTRL1_RG_RIMP_DDR4_SEL, 1);
+	udelay(1);
+	SET32_BITFIELDS(&ch[chn].phy_ao.misc_impcal, MISC_IMPCAL_IMPCAL_CALI_EN, 1);
+	SET32_BITFIELDS(&ch[chn].phy_ao.shu_misc_impcal1,
+		SHU_MISC_IMPCAL1_IMPDRVN, 0,
+		SHU_MISC_IMPCAL1_IMPDRVP, 0);
+
+	for (imp_drv_type drv_type = DRVP; drv_type < IMP_DRV_MAX; drv_type++) {
+		if (drv_type == ODTP)
+			continue;
+		dramc_imp_cal_vref_sel(odt, drv_type);
+
+		switch (drv_type) {
+		case DRVP:
+			enp = 0x1;
+			enn = 0x0;
+			drvp_result = 0;
+			break;
+		case DRVN:
+		case ODTN:
+			enp = 0x0;
+			enn = (drv_type == DRVN) ? 0x0 : 0x1;
+			break;
+		default:
+			die("Can't support drv_type %d\n", drv_type);
+			break;
+		}
+
+		SET32_BITFIELDS(&ch[chn].phy_ao.misc_impcal,
+			MISC_IMPCAL_IMPCAL_CALI_ENP, enp);
+		SET32_BITFIELDS(&ch[chn].phy_ao.misc_impcal,
+			MISC_IMPCAL_IMPCAL_CALI_ENN, enn);
+		SET32_BITFIELDS(&ch[chn].phy_ao.shu_misc_impcal1,
+			SHU_MISC_IMPCAL1_IMPDRVP, drvp_result);
+		SET32_BITFIELDS(&ch[chn].phy_ao.shu_ca_cmd12,
+			SHU_CA_CMD12_RG_RIMP_DRV05, 0);
+
+		cal_res = dramc_sw_imp_cal_result(drv_type);
+		switch (drv_type) {
+		case DRVP:
+			drvp_result = cal_res;
+			break;
+		case DRVN:
+			drvn_result = cal_res;
+			break;
+		case ODTN:
+			odtn_result = cal_res;
+			break;
+		default:
+			die("Can't support drv_type %d\n", drv_type);
+			break;
+		}
+	}
+
+	imp->result[odt][DRVP] = drvp_result;
+	imp->result[odt][DRVN] = drvn_result;
+	imp->result[odt][ODTP] = 0;
+	imp->result[odt][ODTN] = odtn_result;
+
+	dramc_info("freq_region=%d, Reg: DRVP=%d, DRVN=%d, ODTN=%d\n",
+		odt, drvp_result, drvn_result, odtn_result);
+
+	write32(&ch[chn].phy_ao.misc_impcal, impcal_bak);
+	dramc_set_broadcast(bc_bak);
+}
diff --git a/src/soc/mediatek/mt8192/dramc_pi_main.c b/src/soc/mediatek/mt8192/dramc_pi_main.c
index 48f45d17d1..fb8630503c 100644
--- a/src/soc/mediatek/mt8192/dramc_pi_main.c
+++ b/src/soc/mediatek/mt8192/dramc_pi_main.c
@@ -64,6 +64,9 @@ void init_dram(const struct dramc_data *dparam)
 	emi_mdl_init(cali.emi_config);
 	dramc_set_broadcast(bc_bak);
 
+	dramc_sw_impedance_cal(ODT_OFF, &cali.impedance);
+	dramc_sw_impedance_cal(ODT_ON, &cali.impedance);
+
 	if (ddr_info->config_dvfs == DRAMC_ENABLE_DVFS)
 		k_shuffle_end = CALI_SEQ_MAX;
 	else