mb/google/poppy: Add variant callback for romstage GPIO configuration

This change adds variant callback to get GPIO configuration table in
romstage and configures these GPIOs before memory training is
performed.

BUG=b:111860510
BRANCH=poppy

Change-Id: I1eb51356fb3f4c0f4ff29b22dbcde6dbece303ad
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/27863
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/mainboard/google/poppy/romstage.c

@@ -17,8 +17,10 @@
 #include <baseboard/variants.h>
 #include <cbfs.h>
 #include <console/console.h>
+#include <soc/gpio.h>
 #include <soc/romstage.h>
 #include <string.h>
+#include <variant/gpio.h>
 
 #include <fsp/soc_binding.h>
 
@@ -147,6 +149,12 @@ void mainboard_memory_init_params(FSPM_UPD *mupd)
 	FSP_M_CONFIG *mem_cfg = &mupd->FspmConfig;
 	struct memory_params p;
 
+	const struct pad_config *pads;
+	size_t num;
+
+	pads = variant_romstage_gpio_table(&num);
+	gpio_configure_pads(pads, num);
+
 	memset(&p, 0, sizeof(p));
 	variant_memory_params(&p);
 

src/mainboard/google/poppy/variants/baseboard/Makefile.inc

@@ -1,6 +1,7 @@
 bootblock-y += gpio.c
 
 romstage-y += memory.c
+romstage-y += gpio.c
 
 ramstage-y += gpio.c
 ramstage-y += nhlt.c

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

@@ -403,3 +403,9 @@ const struct cros_gpio * __weak variant_cros_gpios(size_t *num)
 	*num = ARRAY_SIZE(cros_gpios);
 	return cros_gpios;
 }
+
+const struct pad_config * __weak variant_romstage_gpio_table(size_t *num)
+{
+	*num = 0;
+	return NULL;
+}

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

@@ -27,6 +27,12 @@
 const struct pad_config *variant_gpio_table(size_t *num);
 const struct pad_config *variant_early_gpio_table(size_t *num);
 
+/*
+ * Callback to get GPIOs to configure in romstage before memory training is
+ * performed.
+ */
+const struct pad_config *variant_romstage_gpio_table(size_t *num);
+
 const struct cros_gpio *variant_cros_gpios(size_t *num);
 /* Config gpio by different sku id */
 const struct pad_config *variant_sku_gpio_table(size_t *num);