t210: new sdram_lp0_save_params() function

New sdram_lp0_save_params() function for T210.

Due to its size, move the function from romstage to ramstage.

BUG=chrome-os-partner:40741
BRANCH=None
TEST=Build ok on Smaug; and check scratch registers

Change-Id: I420ac4c15262f2c6307bcd84beb6c5da0310c7c0
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 38860895938c40062a9f860f75e31a539f15992b
Original-Change-Id: Iaa478969458946faedd295578fe7d72b5a32e701
Original-Signed-off-by: Yen Lin <yelin@nvidia.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/277022
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/10952
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/soc/nvidia/tegra210/Makefile.inc

@@ -54,10 +54,8 @@ romstage-y += power.c
 romstage-y += ram_code.c
 ifneq ($(CONFIG_BOOTROM_SDRAM_INIT),y)
 romstage-y += sdram.c
- ifeq ($(CONFIG_LP0_SUPPORT),y)
 romstage-y += sdram_lp0.c
 endif
-endif
 romstage-y += ../tegra/gpio.c
 romstage-y += ../tegra/i2c.c
 romstage-y += ../tegra/pinmux.c
@@ -78,6 +76,7 @@ ramstage-$(CONFIG_MAINBOARD_DO_DSI_INIT) += ./jdi_25x18_display/panel-jdi-lpm102
 ramstage-$(CONFIG_MAINBOARD_DO_SOR_INIT) += dp.c
 ramstage-$(CONFIG_MAINBOARD_DO_SOR_INIT) += sor.c
 
+ramstage-y += sdram_lp0.c
 ramstage-y += soc.c
 ramstage-y += spi.c
 ramstage-y += i2c.c

src/soc/nvidia/tegra210/sdram.c

@@ -1076,7 +1076,4 @@ void sdram_init(const struct sdram_params *param)
 	sdram_set_refresh(param, emc);
 	sdram_enable_arbiter(param);
 	sdram_lock_carveouts(param, mc);
-#if defined(CONFIG_LP0)
-	sdram_lp0_save_params(param);
-#endif
 }

src/soc/nvidia/tegra210/soc.c

@@ -36,6 +36,8 @@
 #include <string.h>
 #include <timer.h>
 #include <vendorcode/google/chromeos/chromeos.h>
+#include <soc/sdram.h>
+#include <soc/sdram_configs.h>
 
 #include "chip.h"
 
@@ -144,6 +146,10 @@ static void tegra210_init(void *chip_info)
 
 	printk(BIOS_INFO, "chip %x rev %02x.%x\n",
 		rev.chip_id, rev.major, rev.minor);
+
+	/* Save sdram parameters to scratch regs to be used in LP0 resume */
+	sdram_lp0_save_params(get_sdram_config());
+	printk(BIOS_INFO, "sdram params saved.\n");
 }
 
 struct chip_operations soc_nvidia_tegra210_ops = {