mb/google/guybrush: Update GPIOs for fingerprint MCU

Add mainboard finalize and shutdown call to match zork.
Deassert EN_PWR_FP in bootblock, power up correctly in finalize.

| Phase     | SOC_FP_RST_L | EN_PWR_FP | S3 resume            |
|-----------|--------------|-----------|----------------------|
| Bootblock | **Low**      | **Low**   | Maintain High / High |
| Romstage  | Low          | Low       | Maintain High / High |
| Ramstage  | Low          | **High**  | Maintain High / High |
| Finalize  | **High**     | High      |                      |
| Shutdown  | **Low**      | **Low**   |                      |

BUG=b:191694480
TEST=Build, verify GPIO configuration.

Signed-off-by: Martin Roth <martinroth@chromium.org>
Change-Id: Iaae5feec60abb2480777d1f99174254c5132bb43
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56499
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

src/mainboard/google/guybrush/mainboard.c

@@ -176,7 +176,13 @@ static void mainboard_enable(struct device *dev)
 	pm_write32(PM_ESPI_INTR_CTRL, PM_ESPI_DEV_INTR_MASK & ~(BIT(1)));
 }
 
+static void mainboard_final(void *chip_info)
+{
+	variant_finalize_gpios();
+}
+
 struct chip_operations mainboard_ops = {
 	.init = mainboard_init,
 	.enable_dev = mainboard_enable,
+	.final = mainboard_final,
 };

src/mainboard/google/guybrush/variants/baseboard/gpio.c

@@ -4,6 +4,8 @@
 #include <baseboard/gpio.h>
 #include <baseboard/variants.h>
 #include <commonlib/helpers.h>
+#include <delay.h>
+#include <gpio.h>
 #include <soc/gpio.h>
 
 /* GPIO configuration in ramstage*/
@@ -31,8 +33,8 @@ static const struct soc_amd_gpio base_gpio_table[] = {
 	PAD_SCI(GPIO_9, PULL_NONE, EDGE_HIGH),
 	/* S0A3 */
 	PAD_NF(GPIO_10, S0A3, PULL_NONE),
-	/* SOC_FP_RST_L */
-	PAD_GPO(GPIO_11, HIGH),
+	/* SOC_FP_RST_L - Brought high in finalize */
+	PAD_GPO(GPIO_11, LOW),
 	/* SLP_S3_GATED */
 	PAD_GPO(GPIO_12, LOW),
 	/* GPIO_13 - GPIO_15: Not available */
@@ -285,6 +287,13 @@ static const struct soc_amd_gpio pcie_gpio_table[] = {
 	PAD_NFO(GPIO_26, PCIE_RST_L, HIGH),
 };
 
+static const struct soc_amd_gpio gpio_fp_shutdown_table[] = {
+	/* FPMCU_RST_L */
+	PAD_GPO(GPIO_11, LOW),
+	/* EN_PWR_FP */
+	PAD_GPO(GPIO_32, LOW),
+};
+
 const struct soc_amd_gpio *__weak variant_pcie_gpio_table(size_t *size)
 {
 	*size = ARRAY_SIZE(pcie_gpio_table);
@@ -334,6 +343,11 @@ const struct soc_amd_gpio *__weak variant_early_gpio_table(size_t *size)
 
 const __weak struct soc_amd_gpio *variant_sleep_gpio_table(size_t *size)
 {
+	if (acpi_get_sleep_type() == ACPI_S5) {
+		*size = ARRAY_SIZE(gpio_fp_shutdown_table);
+		return gpio_fp_shutdown_table;
+	}
+
 	*size = ARRAY_SIZE(sleep_gpio_table);
 	return sleep_gpio_table;
 }
@@ -342,18 +356,31 @@ __weak void variant_fpmcu_reset(void)
 {
 	if (acpi_get_sleep_type() == ACPI_S3)
 		return;
-	/*
-	 *  SOC_FP_RST_L line is pulled high when platform comes out of reset.
-	 *  So, it is required to be driven low before enabling power to
-	 *  ensure that power sequencing for the FPMCU is met.
-	 *  However, as the FPMCU is initialized only on platform reset,
-	 *  the reset line should not be asserted in case of S3 resume.
-	 */
+	/* If the system is not resuming from S3, power off the FPMCU */
 	static const struct soc_amd_gpio fpmcu_bootblock_table[] = {
 		/* SOC_FP_RST_L */
 		PAD_GPO(GPIO_11, LOW),
 		/* EN_PWR_FP */
-		PAD_GPO(GPIO_32, HIGH),
+		PAD_GPO(GPIO_32, LOW),
 	};
 	program_gpios(fpmcu_bootblock_table, ARRAY_SIZE(fpmcu_bootblock_table));
 }
+
+__weak void variant_finalize_gpios(void)
+{
+	static const struct soc_amd_gpio disable_fpmcu_table[] = {
+		/* FPMCU_RST_L */
+		PAD_NC(GPIO_11),
+		/* EN_PWR_FP */
+		PAD_NC(GPIO_32),
+	};
+
+	if (variant_has_fpmcu()) {
+		if (acpi_get_sleep_type() == ACPI_S3)
+			return;
+		/* Deassert the FPMCU reset to enable the FPMCU */
+		gpio_set(GPIO_11, 1); /* FPMCU_RST_L */
+	} else {
+		program_gpios(disable_fpmcu_table, ARRAY_SIZE(disable_fpmcu_table));
+	}
+}

src/mainboard/google/guybrush/variants/baseboard/include/baseboard/variants.h

@@ -39,6 +39,9 @@ const struct soc_amd_gpio *variant_pcie_gpio_table(size_t *size);
 /* This function provides GPIO settings before entering sleep. */
 const struct soc_amd_gpio *variant_sleep_gpio_table(size_t *size);
 
+/* Finalize GPIOs, such as FPMCU power */
+void variant_finalize_gpios(void);
+
 void variant_fpmcu_reset(void);
 
 bool variant_has_fpmcu(void);