[coreboot-gerrit] New patch to review for coreboot: 31d5ce7 tegra132: Add LPDDR3 SDRAM init in coreboot.

[Patrick Georgi (pgeorgi@google.com)]

Patrick Georgi (pgeorgi at google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9029

-gerrit

commit 31d5ce73510015588be4e699f43d3c6f13aeaf43
Author: Tom Warren <twarren at nvidia.com>
Date:   Tue Sep 2 10:08:04 2014 -0700

    tegra132: Add LPDDR3 SDRAM init in coreboot.
    
    Expanded sdram.c to add support for LPDDR3 init. This code can
    be used with matching BCT .inc files to have LPDDR3 SDRAM
    initialized by coreboot instead of the T132 BootROM.
    
    BUG=chrome-os-partner:29921
    BUG=chrome-os-partner:31031
    BRANCH=None
    TEST=Built for rush and rush_ryu.
    
    Change-Id: I53801d9399dbf67fd86d0a2521174f0668567620
    Signed-off-by: Patrick Georgi <pgeorgi at chromium.org>
    Original-Commit-Id: 60e130c47c1894925a12f251af5b83a1fa144d57
    Original-Change-Id: I6bcffcd22d2e4f8da6d729b6757714657f3f6735
    Original-Signed-off-by: Tom Warren <twarren at nvidia.com>
    Original-Reviewed-on: https://chromium-review.googlesource.com/214753
    Original-Reviewed-by: Aaron Durbin <adurbin at chromium.org>
---
 src/soc/nvidia/tegra132/sdram.c | 57 ++++++++++++++++++++++++++++++++++-------
 1 file changed, 48 insertions(+), 9 deletions(-)

diff --git a/src/soc/nvidia/tegra132/sdram.c b/src/soc/nvidia/tegra132/sdram.c
index 0b1edf1..c1d178e 100644
--- a/src/soc/nvidia/tegra132/sdram.c
+++ b/src/soc/nvidia/tegra132/sdram.c
@@ -475,7 +475,10 @@ static void sdram_set_clock_enable_signal(const struct sdram_params *param,
 		   (param->EmcDevSelect << EMC_NOP_NOP_DEV_SELECTN_SHIFT)),
 		  &regs->nop,
 		  EMC_NOP_NOP_CMD_MASK | EMC_NOP_NOP_DEV_SELECTN_MASK);
+}
 
+static void sdram_init_ddr3(const struct sdram_params *param, struct tegra_emc_regs *regs)
+{
 	/* Write mode registers */
 	writel(param->EmcEmrs2, &regs->emrs2);
 	writel(param->EmcEmrs3, &regs->emrs3);
@@ -483,7 +486,44 @@ static void sdram_set_clock_enable_signal(const struct sdram_params *param,
 	writel(param->EmcMrs, &regs->mrs);
 
 	if (param->EmcExtraModeRegWriteEnable) {
-		writel(param->EmcMrwExtra, &regs->mrs);
+		writel(param->EmcMrsExtra, &regs->mrs);
+	}
+
+	writel(param->EmcZcalInitDev0, &regs->zq_cal);
+	udelay(param->EmcZcalInitWait);
+
+	if ((param->EmcDevSelect & 2) == 0) {
+		writel(param->EmcZcalInitDev1, &regs->zq_cal);
+		udelay(param->EmcZcalInitWait);
+	}
+}
+
+static void sdram_init_lpddr3(const struct sdram_params *param, struct tegra_emc_regs *regs)
+{
+	/* Precharge all banks. DEV_SELECTN = 0 => Select all devices */
+	writel(((param->EmcDevSelect << EMC_REF_DEV_SELECTN_SHIFT) | 1), &regs->pre);
+
+	/* Send Reset MRW command */
+	writel(param->EmcMrwResetCommand, &regs->mrw);
+	udelay(param->EmcMrwResetNInitWait);
+
+	writel(param->EmcZcalInitDev0, &regs->mrw);
+	udelay(param->EmcZcalInitWait);
+
+	if ((param->EmcDevSelect & 2) == 0)
+	{
+		writel(param->EmcZcalInitDev1, &regs->mrw);
+		udelay(param->EmcZcalInitWait);
+	}
+
+	/* Write mode registers */
+	writel(param->EmcMrw2, &regs->mrw2);
+	writel(param->EmcMrw1, &regs->mrw);
+	writel(param->EmcMrw3, &regs->mrw3);
+	writel(param->EmcMrw4, &regs->mrw4);
+
+	if (param->EmcExtraModeRegWriteEnable) {
+		writel(param->EmcMrwExtra, &regs->mrw);
 	}
 }
 
@@ -493,14 +533,12 @@ static void sdram_init_zq_calibration(const struct sdram_params *param,
 	if ((param->EmcZcalWarmColdBootEnables &
 	     EMC_ZCAL_WARM_COLD_BOOT_ENABLES_COLDBOOT_MASK) == 1) {
 		/* Need to initialize ZCAL on coldboot. */
-		writel(param->EmcZcalInitDev0, &regs->zq_cal);
-		udelay(param->EmcZcalInitWait);
-
-		if ((param->EmcDevSelect & 2) == 0) {
-			writel(param->EmcZcalInitDev1, &regs->zq_cal);
-			udelay(param->EmcZcalInitWait);
-		}
+		if (param->MemoryType == NvBootMemoryType_Ddr3)
+			sdram_init_ddr3(param, regs);
+		else if (param->MemoryType == NvBootMemoryType_LpDdr2)
+			sdram_init_lpddr3(param, regs);
 	} else {
+		/* Wait for DLL stablization time even without ZCAL */
 		udelay(param->EmcZcalInitWait);
 	}
 }
@@ -573,7 +611,8 @@ void sdram_init(const struct sdram_params *param)
 		param->MemoryType, clock_get_pll_input_khz() *
 		param->PllMFeedbackDivider / param->PllMInputDivider /
 		(1 + param->PllMSelectDiv2));
-	if (param->MemoryType != NvBootMemoryType_Ddr3)
+	if (param->MemoryType != NvBootMemoryType_Ddr3 &&
+	    param->MemoryType != NvBootMemoryType_LpDdr2)
 		die("Unsupported memory type!\n");
 
 	sdram_configure_pmc(param, pmc);