rockchip/rk3399: Move romstage.c to mainboard/gru

The romstage.c is more board related than soc specific, like
setting the pwm regulators, so moving it to mainboard/gru.

BRANCH=none
BUG=chrome-os-partner:54819
TEST=Bootup on kevin board

Change-Id: I83c6cde9f451480e47e2b4b549cedf65b345134c
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: 35feeb07131a6a9de4adde035236987391833474
Original-Change-Id: If2bf245302eb4fb20bb089c1b3ffa03909722443
Original-Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/375398
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/16367
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

2 files changed, 134 insertions, 0 deletions

diff --git a/src/mainboard/google/gru/Makefile.inc b/src/mainboard/google/gru/Makefile.inc
index 07b27a760b..e1ba56a2f1 100644
--- a/src/mainboard/google/gru/Makefile.inc
+++ b/src/mainboard/google/gru/Makefile.inc
@@ -26,6 +26,7 @@ verstage-y += reset.c
 romstage-y += boardid.c
 romstage-y += chromeos.c
 romstage-y += memlayout.ld
+romstage-y += romstage.c
 romstage-y += sdram_configs.c
 
 ramstage-y += boardid.c
diff --git a/src/mainboard/google/gru/romstage.c b/src/mainboard/google/gru/romstage.c
new file mode 100644
index 0000000000..ccf42b9b5f
--- /dev/null
+++ b/src/mainboard/google/gru/romstage.c
@@ -0,0 +1,133 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 Rockchip Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <arch/cache.h>
+#include <arch/cpu.h>
+#include <arch/exception.h>
+#include <arch/io.h>
+#include <arch/mmu.h>
+#include <boardid.h>
+#include <cbfs.h>
+#include <console/console.h>
+#include <delay.h>
+#include <program_loading.h>
+#include <romstage_handoff.h>
+#include <soc/addressmap.h>
+#include <soc/grf.h>
+#include <soc/mmu_operations.h>
+#include <soc/pwm.h>
+#include <soc/tsadc.h>
+#include <soc/sdram.h>
+#include <symbols.h>
+#include <soc/usb.h>
+
+static const uint64_t dram_size =
+	(uint64_t)min((uint64_t)CONFIG_DRAM_SIZE_MB * MiB, MAX_DRAM_ADDRESS);
+
+static void init_dvs_outputs(void)
+{
+	int duty_ns;
+	uint32_t i;
+	uint32_t id;
+
+	write32(&rk3399_grf->iomux_pwm_0, IOMUX_PWM_0);		/* GPU */
+	write32(&rk3399_grf->iomux_pwm_1, IOMUX_PWM_1);		/* Big */
+	write32(&rk3399_pmugrf->iomux_pwm_2, IOMUX_PWM_2);	/* Little */
+	write32(&rk3399_pmugrf->iomux_pwm_3a, IOMUX_PWM_3_A);	/* Centerlog */
+
+	/*
+	 * Set up voltages for all DVS rails.
+	 *
+	 * LITTLE CPU: At the speed we're running at right now and on the
+	 * early silicon, .9V is sane.  If/when we run faster, let's bump this.
+	 *
+	 * CENTER LOGIC: There are some claims that this should simply always
+	 * be .9 V.  There are other claims that say that we need to adjust this
+	 * dynamically depending on the memory frequency.  Until this is sorted
+	 * out, it appears that .9 V works for the 800 MHz.
+	 *
+	 * BIG CPU / GPU: These aren't used in coreboot.  Init to .9V which is
+	 * supposed to be a good default.
+	 *
+	 * Details:
+	 *   design_min = 0.8
+	 *   design_max = 1.5
+	 *   period = 3337     # 300 kHz
+	 *   volt = 1.1
+	 *   # Intentionally round down (higher volt) to be safe.
+	 *   int((period / (design_max - design_min)) * (design_max - volt))
+	 *
+	 * Apparently a period of 3333 is determined by EEs to be ideal for our
+	 * board design / resistors / capacitors / regulators but due to
+	 * clock dividers we actually get 3337.  Solving, we get:
+	 *   period = 3337, volt = 1.1: 1906
+	 *   period = 3337, volt = 1.0: 2383
+	 *   period = 3337, volt = 0.9: 2860
+	 */
+	duty_ns = 2860; /* 0.9v */
+
+	/* TODO: Clean all this up, implement proper pwm_regulator driver. */
+	if (IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN)) {
+		id = board_id();
+		if (id <= 2)
+			duty_ns = 1906; /* 1.1v */
+		else if (id == 3)
+			duty_ns = 2621; /* 0.95v */
+		else if (id >= 6) {
+			/* GPU: 3337 * (12043 - 9000) / (12043 - 7984) = 2501 */
+			pwm_init(0, 3337, 2501);
+			/* BIG: 3337 * (12837 - 9000) / (12837 - 7985) = 2638 */
+			pwm_init(1, 3337, 2638);
+			/* LIT: 3337 * (12807 - 9000) / (12807 - 8009) = 2647 */
+			pwm_init(2, 3337, 2647);
+			/* CTR: 3337 * (10507 - 9500) / (10507 - 7996) = 1338 */
+			pwm_init(3, 3337, 1338);
+			return;
+		}
+	}
+
+	for (i = 0; i < 4; i++)
+		pwm_init(i, 3337, duty_ns);
+}
+
+static void prepare_usb(void)
+{
+	/*
+	 * Do dwc3 core soft reset and phy reset. Kick these resets
+	 * off early so they get at least 100ms to settle.
+	 */
+	reset_usb_otg0();
+	reset_usb_otg1();
+}
+
+void main(void)
+{
+	console_init();
+	tsadc_init(TSHUT_POL_HIGH);
+	exception_init();
+
+	/* Init DVS to conservative values. */
+	init_dvs_outputs();
+
+	prepare_usb();
+
+	sdram_init(get_sdram_config());
+
+	mmu_config_range((void *)0, (uintptr_t)dram_size, CACHED_MEM);
+	mmu_config_range(_dma_coherent, _dma_coherent_size, UNCACHED_MEM);
+	cbmem_initialize_empty();
+	run_ramstage();
+}