[PATCH v3 2/2] firmware: Keem Bay: Add support for Arm Trusted Firmware Service call

[Zulkifli, Muhammad Husaini]

Hi Sudeep and Michal,

I would like to receive some feedback on this patch before send out another version to fix the autobot compiler warning.

Really appreciated it.
Thanks

>-----Original Message-----
>From: Zulkifli, Muhammad Husaini <muhammad.husaini.zulkifli at intel.com>
>Sent: Tuesday, October 6, 2020 11:56 PM
>To: Hunter, Adrian <adrian.hunter at intel.com>; michal.simek at xilinx.com;
>sudeep.holla at arm.com; ulf.hansson at linaro.org; linux-mmc at vger.kernel.org;
>linux-arm-kernel at lists.infradead.org; linux-kernel at vger.kernel.org
>Cc: Raja Subramanian, Lakshmi Bai <lakshmi.bai.raja.subramanian at intel.com>;
>Wan Mohamad, Wan Ahmad Zainie
><wan.ahmad.zainie.wan.mohamad at intel.com>; Zulkifli, Muhammad Husaini
><muhammad.husaini.zulkifli at intel.com>; arnd at arndb.de
>Subject: [PATCH v3 2/2] firmware: Keem Bay: Add support for Arm Trusted
>Firmware Service call
>
>From: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli at intel.com>
>
>Add header file to handle API function for device driver to communicate with
>Arm Trusted Firmware.
>
>Signed-off-by: Muhammad Husaini Zulkifli
><muhammad.husaini.zulkifli at intel.com>
>---
> .../linux/firmware/intel/keembay_firmware.h   | 46 +++++++++++++++++++
> 1 file changed, 46 insertions(+)
> create mode 100644 include/linux/firmware/intel/keembay_firmware.h
>
>diff --git a/include/linux/firmware/intel/keembay_firmware.h
>b/include/linux/firmware/intel/keembay_firmware.h
>new file mode 100644
>index 000000000000..9adb8c87b788
>--- /dev/null
>+++ b/include/linux/firmware/intel/keembay_firmware.h
>@@ -0,0 +1,46 @@
>+/* SPDX-License-Identifier: GPL-2.0 */
>+/*
>+ *  Intel Keembay SOC Firmware API Layer
>+ *
>+ *  Copyright (C) 2020-2021, Intel Corporation
>+ *
>+ *  Muhammad Husaini Zulkifli <Muhammad.Husaini.Zulkifli at intel.com>
>+ */
>+
>+#ifndef __FIRMWARE_KEEMBAY_SMC_H__
>+#define __FIRMWARE_KEEMBAY_SMC_H__
>+
>+#include <linux/arm-smccc.h>
>+
>+/**
>+ * This file defines API function that can be called by device driver
>+in order to
>+ * communicate with Arm Trusted Firmware.
>+ */
>+
>+/* Setting for Keem Bay IO Pad Line Voltage Selection */
>+#define KEEMBAY_SET_SD_VOLTAGE_FUNC_ID	0x8200ff26
>+#define KEEMBAY_SET_1V8_VOLT		0x01
>+#define KEEMBAY_SET_3V3_VOLT		0x00
>+
>+#if IS_ENABLED(CONFIG_HAVE_ARM_SMCCC_DISCOVERY)
>+static int do_fw_invoke(u64 func_id, u64 arg0, u64 arg1) {
>+	struct arm_smccc_res res;
>+
>+	arm_smccc_1_1_invoke(func_id, arg0, arg1, &res);
>+
>+	return res.a0;
>+}
>+
>+int keembay_sd_voltage_selection(int volt) {
>+	return do_fw_invoke(KEEMBAY_SET_SD_VOLTAGE_FUNC_ID, volt, 0); }
>#else
>+static inline int keembay_sd_voltage_selection(int volt) {
>+	return -ENODEV;
>+}
>+#endif
>+
>+#endif /* __FIRMWARE_KEEMBAY_SMC_H__ */
>--
>2.17.1