[coreboot-gerrit] [S] Change in coreboot[main]: mb/google/brya/uldrenite: Add WWAN RW350R-GL power on sequence

[Subrata Banik (Code Review)]

Subrata Banik has submitted this change. ( https://review.coreboot.org/c/coreboot/+/85537?usp=email )

Change subject: mb/google/brya/uldrenite: Add WWAN RW350R-GL power on sequence
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mb/google/brya/uldrenite: Add WWAN RW350R-GL power on sequence

Uldrenite supports the WWAN 5G device and uses variant.c to handle the
power-on sequence according to the Rolling Wireless_RW350R-GL_Hardware
Guide_Generic_V1.1. Due to no hardware access, the boot time is
estimated to increase by 50 ms.

At this stage, we do not yet have the board or key parts for
verification. However, I still need to merge the CL to ensure that the
WWAN functionality works. Once the motherboard is available, I will make
adjustments to optimize and reduce the boot time.

BUG=b:381393809, b:383212261
BRANCH=None
TEST=emerge-nissa coreboot

Change-Id: If8695920c2b3d2a27da62afcbe75e70d1ea09792
Signed-off-by: John Su 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85537
Tested-by: build bot (Jenkins) 
Reviewed-by: Eric Lai 
Reviewed-by: Dinesh Gehlot 
Reviewed-by: Kapil Porwal 
Reviewed-by: Dtrain Hsu 
---
M src/mainboard/google/brya/variants/uldrenite/Makefile.mk
A src/mainboard/google/brya/variants/uldrenite/variant.c
2 files changed, 37 insertions(+), 0 deletions(-)

Approvals:
  Kapil Porwal: Looks good to me, approved
  Eric Lai: Looks good to me, approved
  Dtrain Hsu: Looks good to me, approved
  build bot (Jenkins): Verified
  Dinesh Gehlot: Looks good to me, approved

diff --git a/src/mainboard/google/brya/variants/uldrenite/Makefile.mk b/src/mainboard/google/brya/variants/uldrenite/Makefile.mk
index 87f515a..c31fa30 100644
--- a/src/mainboard/google/brya/variants/uldrenite/Makefile.mk
+++ b/src/mainboard/google/brya/variants/uldrenite/Makefile.mk
@@ -5,4 +5,5 @@
 romstage-y += memory.c
 ramstage-y += gpio.c

+ramstage-$(CONFIG_FW_CONFIG) += variant.c
 ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_HDA_VERB) += hda_verb.c
diff --git a/src/mainboard/google/brya/variants/uldrenite/variant.c b/src/mainboard/google/brya/variants/uldrenite/variant.c
new file mode 100644
index 0000000..753abb6
--- /dev/null
+++ b/src/mainboard/google/brya/variants/uldrenite/variant.c
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <baseboard/gpio.h>
+#include <baseboard/variants.h>
+#include <console/console.h>
+#include <delay.h>
+
+#define RW350R_RST_DELAY_MS 20
+#define RW350R_PERST_DELAY_MS 30
+
+static const struct pad_config rw350r_en_pad[] = {
+	/* H23 : LTE_PWR_OFF_EN */
+	PAD_CFG_GPO(GPP_H23, 1, DEEP),
+};
+static const struct pad_config rw350r_rst_pad[] = {
+	/* F12 : WWAN_RST_L */
+	PAD_CFG_GPO_LOCK(GPP_F12, 1, LOCK_CONFIG),
+};
+static const struct pad_config rw350r_perst_pad[] = {
+	/* F13 : PLTRST_WWAN# */
+	PAD_CFG_GPO(GPP_F13, 1, DEEP),
+};
+
+void variant_init(void)
+{
+	/*
+	 * RW350R power on seuqence:
+	 * De-assert WWAN_EN -> 20ms -> de-assert WWAN_RST -> 30ms ->
+	 * de-assert WWAN_PERST
+	 */
+	gpio_configure_pads(rw350r_en_pad, ARRAY_SIZE(rw350r_en_pad));
+	mdelay(RW350R_RST_DELAY_MS);
+	gpio_configure_pads(rw350r_rst_pad, ARRAY_SIZE(rw350r_rst_pad));
+	mdelay(RW350R_PERST_DELAY_MS);
+	gpio_configure_pads(rw350r_perst_pad, ARRAY_SIZE(rw350r_perst_pad));
+}