Change in coreboot[master]: mediatek/mt8183: Add DDR driver of rx datlat calibration part

[Tristan Hsieh (Code Review)]

Tristan Hsieh has uploaded this change for review. ( https://review.coreboot.org/28843

Change subject: mediatek/mt8183: Add DDR driver of rx datlat calibration part
......................................................................

mediatek/mt8183: Add DDR driver of rx datlat calibration part

BUG=b:80501386
BRANCH=none
TEST=Boots correctly on Kukui, and inits DRAM successfully with related
     patches.

Change-Id: Ia20de54633bf1077bd469df75ccb4390308e0b97
Signed-off-by: Huayang Duan 
---
M src/soc/mediatek/mt8183/dramc_pi_calibration_api.c
1 file changed, 78 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/43/28843/1

diff --git a/src/soc/mediatek/mt8183/dramc_pi_calibration_api.c b/src/soc/mediatek/mt8183/dramc_pi_calibration_api.c
index f6ab9a0..2295f39 100644
--- a/src/soc/mediatek/mt8183/dramc_pi_calibration_api.c
+++ b/src/soc/mediatek/mt8183/dramc_pi_calibration_api.c
@@ -1701,6 +1701,81 @@
    return 0;
 }

+
+static void dle_factor_handler(u8 chn, u8 curr_val)
+{
+	curr_val = MAX(curr_val, 2);
+	clrsetbits_le32(&ch[chn].ao.shu[0].conf[1],
+		(SHU_CONF1_DATLAT_MASK) | (SHU_CONF1_DATLAT_DSEL_MASK) |
+		(SHU_CONF1_DATLAT_DSEL_PHY_MASK),
+		(curr_val << SHU_CONF1_DATLAT_SHIFT) |
+		((curr_val - 2) << SHU_CONF1_DATLAT_DSEL_SHIFT) |
+		((curr_val - 2) << SHU_CONF1_DATLAT_DSEL_PHY_SHIFT));
+	dram_phy_reset(chn);
+}
+
+static u8 dramc_rx_datlat_cal(u8 chn, u8 rank)
+{
+	u32 err = 0xffffffff, datlat_begin = 7;
+	s32 datlat, first = -1, sum = 0, best_step = 0;
+
+	best_step = read32(&ch[chn].ao.shu[0].conf[1]) &
+		(SHU_CONF1_DATLAT_MASK);
+
+	dramc_show("[DATLAT] start. CH%d RK%d DATLAT Default: 0x%x\n",
+		chn, rank, best_step);
+
+	u32 dummy_rd_backup = read32(&ch[chn].ao.dummy_rd);
+	dramc_engine2_init(chn, rank, 0x400, 0);
+
+	for (datlat = datlat_begin; datlat < DATLAT_TAP_NUMBER; datlat++) {
+		dle_factor_handler(chn, datlat);
+
+		err = dramc_engine2_run(chn, TE_OP_WRITE_READ_CHECK);
+
+		if (err && (first != -1))
+			break;
+
+		if (sum > 4)
+			break;
+
+		if (err == 0) {
+			if (first == -1)
+				first = datlat;
+
+			sum++;
+		}
+
+		dramc_show("TAP=%2d, err_value=0x%8x, sum=%d\n",
+				datlat, err, sum);
+	}
+
+	dramc_engine2_end(chn);
+	write32(&ch[chn].ao.dummy_rd, dummy_rd_backup);
+
+	best_step = first + (sum >> 1);
+	dramc_dbg("first_step=%d, total pass=%d, best_step=%d\n",
+		first, sum, best_step);
+
+	assert(sum != 0);
+
+	dle_factor_handler(chn, best_step);
+
+	clrsetbits_le32(&ch[chn].ao.padctrl, PADCTRL_DQIENQKEND_MASK,
+		(0x1 << PADCTRL_DQIENQKEND_SHIFT) |
+		(0x1 << PADCTRL_DQIENLATEBEGIN_SHIFT));
+
+	return (u8)best_step;
+}
+
+static void dramc_dual_rank_rx_datlat_cal(u8 chn, u8 datlat0, u8 datlat1)
+{
+	u8 final_datlat = MAX(datlat0, datlat1);
+	dle_factor_handler(chn, final_datlat);
+	dramc_dbg("[%s] RK0: %d, RK1: %d, Final_Datlat %d\n",
+		__func__, datlat0, datlat1, final_datlat);
+}
+
 static void dramc_rx_dqs_gating_post_process(u8 chn)
 {
    u8 dqs, rank_rx_dvs, dqsinctl, rank;
@@ -1801,6 +1876,7 @@

void dramc_calibrate_all_channels(const struct sdram_params *pams)
 {
+	u8 rx_datlat[RANK_MAX] = {0x0};
    for (u8 chn = 0; chn < CHANNEL_MAX; chn++) {
    	for (u8 rk = RANK_0; rk < RANK_MAX; rk++) {
    		dramc_show("start K ch:%d, rank:%d\n", chn, rk);
@@ -1812,9 +1888,11 @@
    		dramc_window_perbit_cal(chn, rk, RX_WIN_RD_DQC, pams);
    		dramc_window_perbit_cal(chn, rk, TX_WIN_DQ_DQM, pams);
    		dramc_window_perbit_cal(chn, rk, TX_WIN_DQ_ONLY, pams);
+			rx_datlat[rk] = dramc_rx_datlat_cal(chn, rk);
    		dramc_window_perbit_cal(chn, rk, RX_WIN_TEST_ENG, pams);
    	}

dramc_rx_dqs_gating_post_process(chn);
+		dramc_dual_rank_rx_datlat_cal(chn, rx_datlat[0], rx_datlat[1]);
    }
 }