mb/purism/librem_cnl: move setting of FSP-M UPDs into variant.c

The upcoming Librem 14 variant won't use the same SATA HSIO adjustments
as the Librem Mini, so move these settings into a variant-specific file.

Rename existing gpio.h to variant.h, move to board root directory, and
use for all variant-specific declarations; adjust references as needed.

Add newly-created variant.c to Makefile.

Test: build/boot Librem Mini, verify SATA functionality unchanged.

Change-Id: Ie8f714cc759675c692ad6e3f20e50adad8d09d4b
Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48519
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/purism/librem_cnl/Makefile.inc

@@ -1,5 +1,7 @@
 ## SPDX-License-Identifier: GPL-2.0-only
 
+romstage-y += variants/$(VARIANT_DIR)/variant.c
+
 ramstage-y += variants/$(VARIANT_DIR)/gpio.c
 ramstage-y += variants/$(VARIANT_DIR)/hda_verb.c
 ramstage-y += ramstage.c

src/mainboard/purism/librem_cnl/ramstage.c

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <soc/ramstage.h>
-#include <variant/gpio.h>
+#include "variant.h"
 
 void mainboard_silicon_init_params(FSP_S_CONFIG *params)
 {

src/mainboard/purism/librem_cnl/romstage.c

@@ -2,6 +2,7 @@
 
 #include <soc/cnl_memcfg_init.h>
 #include <soc/romstage.h>
+#include "variant.h"
 
 static const struct cnl_mb_cfg memcfg = {
 
@@ -50,10 +51,5 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 {
 	FSP_M_CONFIG *mem_cfg = &memupd->FspmConfig;
 	cannonlake_memcfg_init(mem_cfg, &memcfg);
-
-	/* Enable and set SATA HSIO adjustments for ports 0 and 2 */
-	mem_cfg->PchSataHsioRxGen3EqBoostMagEnable[0] = 1;
-	mem_cfg->PchSataHsioRxGen3EqBoostMagEnable[2] = 1;
-	mem_cfg->PchSataHsioRxGen3EqBoostMag[0] = 2;
-	mem_cfg->PchSataHsioRxGen3EqBoostMag[2] = 1;
+	variant_memory_init_params(mem_cfg);
 }

src/mainboard/purism/librem_cnl/variant.h

@@ -1,11 +1,14 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#ifndef VARIANT_GPIO_H
-#define VARIANT_GPIO_H
+#ifndef VARIANT_H
+#define VARIANT_H
 
 #include <soc/gpe.h>
 #include <soc/gpio.h>
+#include <soc/romstage.h>
 
 const struct pad_config *variant_gpio_table(size_t *num);
 
+void variant_memory_init_params(FSP_M_CONFIG *mem_cfg);
+
 #endif

src/mainboard/purism/librem_cnl/variants/librem_mini/gpio.c

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#include <variant/gpio.h>
+#include "../../variant.h"
 
 /* Pad configuration was generated automatically using intelp2m utility */
 static const struct pad_config gpio_table[] = {

src/mainboard/purism/librem_cnl/variants/librem_mini/variant.c

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include "../../variant.h"
+
+void variant_memory_init_params(FSP_M_CONFIG *mem_cfg)
+{
+	/* Enable and set SATA HSIO adjustments for ports 0 and 2 */
+	mem_cfg->PchSataHsioRxGen3EqBoostMagEnable[0] = 1;
+	mem_cfg->PchSataHsioRxGen3EqBoostMagEnable[2] = 1;
+	mem_cfg->PchSataHsioRxGen3EqBoostMag[0] = 2;
+	mem_cfg->PchSataHsioRxGen3EqBoostMag[2] = 1;
+}