marvell: drivers: Add thermal driver

Add thermal driver for A8K SoC family.
The termal unit data is used by Marvell DRAM initialization
code for optimizing the memory controller configuration

Change-Id: Iad92689fa6e4224a89d872e9aa015393abd9cf73
Signed-off-by: Hanna Hawa <hannah@marvell.com>
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>

drivers/marvell/thermal.c

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * SPDX-License-Identifier:	BSD-3-Clause
+ * https://spdx.org/licenses
+ */
+
+/* Driver for thermal unit located in Marvell ARMADA 8K and compatible SoCs */
+
+#include <debug.h>
+#include <thermal.h>
+
+int marvell_thermal_init(struct tsen_config *tsen_cfg)
+{
+	if (tsen_cfg->tsen_ready == 1) {
+		INFO("thermal sensor is already initialized\n");
+		return 0;
+	}
+
+	if (tsen_cfg->ptr_tsen_probe == NULL) {
+		ERROR("initial thermal sensor configuration is missing\n");
+		return -1;
+	}
+
+	if (tsen_cfg->ptr_tsen_probe(tsen_cfg)) {
+		ERROR("thermal sensor initialization failed\n");
+		return -1;
+	}
+
+	VERBOSE("thermal sensor was initialized\n");
+
+	return 0;
+}
+
+int marvell_thermal_read(struct tsen_config *tsen_cfg, int *temp)
+{
+	if (temp == NULL) {
+		ERROR("NULL pointer for temperature read\n");
+		return -1;
+	}
+
+	if (tsen_cfg->ptr_tsen_read == NULL ||
+	    tsen_cfg->tsen_ready == 0) {
+		ERROR("thermal sensor was not initialized\n");
+		return -1;
+	}
+
+	if (tsen_cfg->ptr_tsen_read(tsen_cfg, temp)) {
+		ERROR("temperature read failed\n");
+		return -1;
+	}
+
+	return 0;
+}

include/drivers/marvell/thermal.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * SPDX-License-Identifier:	BSD-3-Clause
+ * https://spdx.org/licenses
+ */
+
+/* Driver for thermal unit located in Marvell ARMADA 8K and compatible SoCs */
+
+#ifndef _THERMAL_H
+#define _THERMAL_H
+
+struct tsen_config {
+	/* thermal temperature parameters */
+	int tsen_offset;
+	int tsen_gain;
+	int tsen_divisor;
+	/* thermal data */
+	int tsen_ready;
+	void *regs_base;
+	/* thermal functionality */
+	int (*ptr_tsen_probe)(struct tsen_config *cfg);
+	int (*ptr_tsen_read)(struct tsen_config *cfg, int *temp);
+};
+
+/* Thermal driver APIs */
+int marvell_thermal_init(struct tsen_config *tsen_cfg);
+int marvell_thermal_read(struct tsen_config *tsen_cfg, int *temp);
+struct tsen_config *marvell_thermal_config_get(void);
+
+#endif /* _THERMAL_H */