hatch: Fix FPMCU pwr/rst gpio handling

1. No gpio control in bootblock
2. Disable power and assert reset in ramstage gpio
3. Power on and then deassert reset at the end of ramstage gpio
4. Disable power and assert reset when entering S5

On "reboot", the amount of time the power is disabled for is
equivalent to the amount of time between triggering #4 and wrapping
around to #3, which is about 400ms on Kohaku.

Since #2 forces power off for FPMCU, S3 resume will still
not work properly.

Additionally, we must ensure that GPP_A12 is reconfigured as an output
before going to any sleep state, since user space could have configured
it to use its native3 function.
See https://review.coreboot.org/c/coreboot/+/32111 for more detail.

The control signals have been validated on a Kohaku in
the following scenarios:
1. Cold startup
2. Issuing a "reboot" command
3. Issuing a "halt -p" and powering back on within 10 seconds
4. Issuing a "halt -p" and powering back on after 10 seconds
5. Entering and leaving S3 (does not work properly)
6. Entering and leaving S0iX

BRANCH=hatch
BUG=b/142751685
TEST=Verify all signals as mentioned above
TEST=reboot
     flash_fp_mcu /opt/google/biod/fw/dartmonkey_v2.0.2417-af88cc91a.bin
TEST=halt -p
     # power back on within 10 seconds
     flash_fp_mcu /opt/google/biod/fw/dartmonkey_v2.0.2417-af88cc91a.bin
TEST=halt -p
     # power back on after 10 seconds
     flash_fp_mcu /opt/google/biod/fw/dartmonkey_v2.0.2417-af88cc91a.bin

Change-Id: I2e3ff42715611d519677a4256bdd172ec98687f9
Signed-off-by: Craig Hesling <hesling@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37459
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/google/hatch/ramstage.c b/src/mainboard/google/hatch/ramstage.c
index e9f5062..e84aa18 100644
--- a/src/mainboard/google/hatch/ramstage.c
+++ b/src/mainboard/google/hatch/ramstage.c
@@ -31,6 +31,11 @@
 	/* Override dev tree settings per board */
 }
 
+void __weak variant_ramstage_init(void)
+{
+	/* Default weak implementation */
+}
+
 static void mainboard_init(struct device *dev)
 {
 	mainboard_ec_init();
@@ -56,6 +61,8 @@
 					base_gpios,
 					override_table,
 					override_gpios);
+
+	variant_ramstage_init();
 }
 
 struct chip_operations mainboard_ops = {
diff --git a/src/mainboard/google/hatch/variants/baseboard/gpio.c b/src/mainboard/google/hatch/variants/baseboard/gpio.c
index 598600b..94cb2e5 100644
--- a/src/mainboard/google/hatch/variants/baseboard/gpio.c
+++ b/src/mainboard/google/hatch/variants/baseboard/gpio.c
@@ -38,7 +38,7 @@
 	/* A11 : PCH_SPI_FPMCU_CS_L */
 	PAD_CFG_NF(GPP_A11, NONE, DEEP, NF2),
 	/* A12 : FPMCU_RST_ODL */
-	PAD_CFG_GPO(GPP_A12, 1, DEEP),
+	PAD_CFG_GPO(GPP_A12, 0, DEEP),
 	/* A13 : SUSWARN_L */
 	PAD_CFG_NF(GPP_A13, NONE, DEEP, NF1),
 	/* A14 : ESPI_RST_L */
@@ -133,7 +133,7 @@
 	/* C10 : GPP_10 ==> GPP_C10_TP */
 	PAD_NC(GPP_C10, NONE),
 	/* C11 : GPP_11 ==> EN_FP_RAILS */
-	PAD_CFG_GPO(GPP_C11, 1, DEEP),
+	PAD_CFG_GPO(GPP_C11, 0, DEEP),
 	/* C12 : GPP_C12 ==> NC */
 	PAD_NC(GPP_C12, NONE),
 	/* C13 : EC_PCH_INT_L */
@@ -398,8 +398,10 @@
 }
 
 /*
- * Default GPIO settings before entering sleep. Configure A12: FPMCU_RST_ODL
- * as GPO before entering sleep.
+ * Default GPIO settings before entering non-S5 sleep states.
+ * Configure A12: FPMCU_RST_ODL as GPO before entering sleep.
+ * This guarantees that A12's native3 function is disabled.
+ * See https://review.coreboot.org/c/coreboot/+/32111 .
  */
 static const struct pad_config default_sleep_gpio_table[] = {
 	PAD_CFG_GPO(GPP_A12, 1, DEEP), /* FPMCU_RST_ODL */
@@ -408,10 +410,11 @@
 /*
  * GPIO settings before entering S5, which are same as
  * default_sleep_gpio_table but also,
- * turn off EN_PP3300_WWAN.
+ * turn off EN_PP3300_WWAN and FPMCU.
  */
 static const struct pad_config s5_sleep_gpio_table[] = {
-	PAD_CFG_GPO(GPP_A12, 1, DEEP), /* FPMCU_RST_ODL */
+	PAD_CFG_GPO(GPP_A12, 0, DEEP), /* FPMCU_RST_ODL */
+	PAD_CFG_GPO(GPP_C11, 0, DEEP), /* PCH_FP_PWR_EN */
 	PAD_CFG_GPO(GPP_A18, 0, DEEP), /* EN_PP3300_WWAN */
 };
 
diff --git a/src/mainboard/google/hatch/variants/baseboard/include/baseboard/variants.h b/src/mainboard/google/hatch/variants/baseboard/include/baseboard/variants.h
index 920e428..1542d9b 100644
--- a/src/mainboard/google/hatch/variants/baseboard/include/baseboard/variants.h
+++ b/src/mainboard/google/hatch/variants/baseboard/include/baseboard/variants.h
@@ -50,4 +50,7 @@
 /* Modify devictree settings during ramstage. */
 void variant_devtree_update(void);
 
+/* Perform variant specific initialization early on in ramstage. */
+void variant_ramstage_init(void);
+
 #endif /* BASEBOARD_VARIANTS_H */
diff --git a/src/mainboard/google/hatch/variants/helios/Makefile.inc b/src/mainboard/google/hatch/variants/helios/Makefile.inc
index fbd69c4..be074b7 100644
--- a/src/mainboard/google/hatch/variants/helios/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/helios/Makefile.inc
@@ -17,4 +17,6 @@
 
 romstage-y += memory.c
 bootblock-y += gpio.c
+
 ramstage-y += gpio.c
+ramstage-y += ramstage.c
diff --git a/src/mainboard/google/hatch/variants/helios/gpio.c b/src/mainboard/google/hatch/variants/helios/gpio.c
index 85eb3fc..456877c 100644
--- a/src/mainboard/google/hatch/variants/helios/gpio.c
+++ b/src/mainboard/google/hatch/variants/helios/gpio.c
@@ -117,8 +117,6 @@
  * needed in this table.
  */
 static const struct pad_config early_gpio_table[] = {
-	/* A12 : FPMCU_RST_ODL */
-	PAD_CFG_GPO(GPP_A12, 0, DEEP),
 	/* B15 : H1_SLAVE_SPI_CS_L */
 	PAD_CFG_NF(GPP_B15, NONE, DEEP, NF1),
 	/* B16 : H1_SLAVE_SPI_CLK */
@@ -127,8 +125,6 @@
 	PAD_CFG_NF(GPP_B17, NONE, DEEP, NF1),
 	/* B18 : H1_SLAVE_SPI_MOSI_R */
 	PAD_CFG_NF(GPP_B18, NONE, DEEP, NF1),
-	/* C11 : GPP_C11 ==> EN_FP_RAILS */
-	PAD_CFG_GPO(GPP_C11, 1, DEEP),
 	/* C14 : BT_DISABLE_L */
 	PAD_CFG_GPO(GPP_C14, 0, DEEP),
 	/* PCH_WP_OD */
@@ -150,14 +146,30 @@
 }
 
 /*
- * GPIO settings before entering all sleep states
+ * Default GPIO settings before entering non-S5 sleep states.
+ * Configure A12: FPMCU_RST_ODL as GPO before entering sleep.
+ * This guarantees that A12's native3 function is disabled.
+ * See https://review.coreboot.org/c/coreboot/+/32111 .
  */
-static const struct pad_config sleep_gpio_table[] = {
+static const struct pad_config default_sleep_gpio_table[] = {
 	PAD_CFG_GPO(GPP_A12, 1, DEEP), /* FPMCU_RST_ODL */
 };
 
+/*
+ * GPIO settings before entering S5, which are same as
+ * default_sleep_gpio_table but also, turn off FPMCU.
+ */
+static const struct pad_config s5_sleep_gpio_table[] = {
+	PAD_CFG_GPO(GPP_A12, 0, DEEP), /* FPMCU_RST_ODL */
+	PAD_CFG_GPO(GPP_C11, 0, DEEP), /* PCH_FP_PWR_EN */
+};
+
 const struct pad_config *variant_sleep_gpio_table(u8 slp_typ, size_t *num)
 {
-	*num = ARRAY_SIZE(sleep_gpio_table);
-	return sleep_gpio_table;
+	if (slp_typ == ACPI_S5) {
+		*num = ARRAY_SIZE(s5_sleep_gpio_table);
+		return s5_sleep_gpio_table;
+	}
+	*num = ARRAY_SIZE(default_sleep_gpio_table);
+	return default_sleep_gpio_table;
 }
diff --git a/src/mainboard/google/hatch/variants/helios/ramstage.c b/src/mainboard/google/hatch/variants/helios/ramstage.c
new file mode 100644
index 0000000..9b919fc
--- /dev/null
+++ b/src/mainboard/google/hatch/variants/helios/ramstage.c
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google LLC
+ *
+ * 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 <delay.h>
+#include <gpio.h>
+#include <baseboard/variants.h>
+#include <soc/gpio.h>
+
+void variant_ramstage_init(void)
+{
+	/*
+	 * Enable power to FPMCU, wait for power rail to stabilize,
+	 * and then deassert FPMCU reset.
+	 * Waiting for the power rail to stabilize can take a while,
+	 * a minimum of 400us on Kohaku.
+	 */
+	gpio_output(GPP_C11, 1);
+	mdelay(1);
+	gpio_output(GPP_A12, 1);
+}
diff --git a/src/mainboard/google/hatch/variants/kindred/gpio.c b/src/mainboard/google/hatch/variants/kindred/gpio.c
index 827ee0b..9e2d818 100644
--- a/src/mainboard/google/hatch/variants/kindred/gpio.c
+++ b/src/mainboard/google/hatch/variants/kindred/gpio.c
@@ -154,8 +154,6 @@
  * needed in this table.
  */
 static const struct pad_config early_gpio_table[] = {
-	/* A12 : FPMCU_RST_ODL */
-	PAD_CFG_GPO(GPP_A12, 0, DEEP),
 	/* B15 : H1_SLAVE_SPI_CS_L */
 	PAD_CFG_NF(GPP_B15, NONE, DEEP, NF1),
 	/* B16 : H1_SLAVE_SPI_CLK */
diff --git a/src/mainboard/google/hatch/variants/kohaku/Makefile.inc b/src/mainboard/google/hatch/variants/kohaku/Makefile.inc
index 9cdff32..6bd2973 100644
--- a/src/mainboard/google/hatch/variants/kohaku/Makefile.inc
+++ b/src/mainboard/google/hatch/variants/kohaku/Makefile.inc
@@ -17,4 +17,6 @@
 romstage-y += memory.c
 
 bootblock-y += gpio.c
+
 ramstage-y += gpio.c
+ramstage-y += ramstage.c
diff --git a/src/mainboard/google/hatch/variants/kohaku/gpio.c b/src/mainboard/google/hatch/variants/kohaku/gpio.c
index 61d3375..f52cc27 100644
--- a/src/mainboard/google/hatch/variants/kohaku/gpio.c
+++ b/src/mainboard/google/hatch/variants/kohaku/gpio.c
@@ -97,8 +97,6 @@
  * needed in this table.
  */
 static const struct pad_config early_gpio_table[] = {
-	/* A12 : FPMCU_RST_ODL */
-	PAD_CFG_GPO(GPP_A12, 0, DEEP),
 	/* B15 : H1_SLAVE_SPI_CS_L */
 	PAD_CFG_NF(GPP_B15, NONE, DEEP, NF1),
 	/* B16 : H1_SLAVE_SPI_CLK */
@@ -136,14 +134,30 @@
 }
 
 /*
- * GPIO settings before entering all sleep states
+ * Default GPIO settings before entering non-S5 sleep states.
+ * Configure A12: FPMCU_RST_ODL as GPO before entering sleep.
+ * This guarantees that A12's native3 function is disabled.
+ * See https://review.coreboot.org/c/coreboot/+/32111 .
  */
-static const struct pad_config sleep_gpio_table[] = {
+static const struct pad_config default_sleep_gpio_table[] = {
 	PAD_CFG_GPO(GPP_A12, 1, DEEP), /* FPMCU_RST_ODL */
 };
 
+/*
+ * GPIO settings before entering S5, which are same as
+ * default_sleep_gpio_table but also, turn off FPMCU.
+ */
+static const struct pad_config s5_sleep_gpio_table[] = {
+	PAD_CFG_GPO(GPP_A12, 0, DEEP), /* FPMCU_RST_ODL */
+	PAD_CFG_GPO(GPP_C11, 0, DEEP), /* PCH_FP_PWR_EN */
+};
+
 const struct pad_config *variant_sleep_gpio_table(u8 slp_typ, size_t *num)
 {
-	*num = ARRAY_SIZE(sleep_gpio_table);
-	return sleep_gpio_table;
+	if (slp_typ == ACPI_S5) {
+		*num = ARRAY_SIZE(s5_sleep_gpio_table);
+		return s5_sleep_gpio_table;
+	}
+	*num = ARRAY_SIZE(default_sleep_gpio_table);
+	return default_sleep_gpio_table;
 }
diff --git a/src/mainboard/google/hatch/variants/kohaku/ramstage.c b/src/mainboard/google/hatch/variants/kohaku/ramstage.c
new file mode 100644
index 0000000..9b919fc
--- /dev/null
+++ b/src/mainboard/google/hatch/variants/kohaku/ramstage.c
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google LLC
+ *
+ * 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 <delay.h>
+#include <gpio.h>
+#include <baseboard/variants.h>
+#include <soc/gpio.h>
+
+void variant_ramstage_init(void)
+{
+	/*
+	 * Enable power to FPMCU, wait for power rail to stabilize,
+	 * and then deassert FPMCU reset.
+	 * Waiting for the power rail to stabilize can take a while,
+	 * a minimum of 400us on Kohaku.
+	 */
+	gpio_output(GPP_C11, 1);
+	mdelay(1);
+	gpio_output(GPP_A12, 1);
+}