1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/st/reset/stm32mp1_reset.c b/drivers/st/reset/stm32mp1_reset.c
new file mode 100644
index 0000000..98c8dcf
--- /dev/null
+++ b/drivers/st/reset/stm32mp1_reset.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2018-2019, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <errno.h>
+#include <limits.h>
+
+#include <platform_def.h>
+
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <drivers/delay_timer.h>
+#include <drivers/st/stm32mp_reset.h>
+#include <lib/mmio.h>
+#include <lib/utils_def.h>
+
+static uint32_t id2reg_offset(unsigned int reset_id)
+{
+	return ((reset_id & GENMASK(31, 5)) >> 5) * sizeof(uint32_t);
+}
+
+static uint8_t id2reg_bit_pos(unsigned int reset_id)
+{
+	return (uint8_t)(reset_id & GENMASK(4, 0));
+}
+
+int stm32mp_reset_assert(uint32_t id, unsigned int to_us)
+{
+	uint32_t offset = id2reg_offset(id);
+	uint32_t bitmsk = BIT(id2reg_bit_pos(id));
+	uintptr_t rcc_base = stm32mp_rcc_base();
+
+	mmio_write_32(rcc_base + offset, bitmsk);
+
+	if (to_us != 0U) {
+		uint64_t timeout_ref = timeout_init_us(to_us);
+
+		while ((mmio_read_32(rcc_base + offset) & bitmsk) == 0U) {
+			if (timeout_elapsed(timeout_ref)) {
+				return -ETIMEDOUT;
+			}
+		}
+	}
+
+	return 0;
+}
+
+int stm32mp_reset_deassert(uint32_t id, unsigned int to_us)
+{
+	uint32_t offset = id2reg_offset(id) + RCC_RSTCLRR_OFFSET;
+	uint32_t bitmsk = BIT(id2reg_bit_pos(id));
+	uintptr_t rcc_base = stm32mp_rcc_base();
+
+	mmio_write_32(rcc_base + offset, bitmsk);
+
+	if (to_us != 0U) {
+		uint64_t timeout_ref = timeout_init_us(to_us);
+
+		while ((mmio_read_32(rcc_base + offset) & bitmsk) != 0U) {
+			if (timeout_elapsed(timeout_ref)) {
+				return -ETIMEDOUT;
+			}
+		}
+	}
+
+	return 0;
+}