1 files changed, 74 insertions, 0 deletions
diff --git a/plat/st/stm32mp1/stm32mp1_dbgmcu.c b/plat/st/stm32mp1/stm32mp1_dbgmcu.c
new file mode 100644
index 0000000..08e332a
--- /dev/null
+++ b/plat/st/stm32mp1/stm32mp1_dbgmcu.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2016-2022, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+
+#include <common/debug.h>
+#include <drivers/st/bsec.h>
+#include <drivers/st/bsec2_reg.h>
+#include <drivers/st/stm32mp1_rcc.h>
+#include <lib/mmio.h>
+#include <lib/utils_def.h>
+
+#include <platform_def.h>
+#include <stm32mp1_dbgmcu.h>
+
+#define DBGMCU_IDC		U(0x00)
+
+#define DBGMCU_IDC_DEV_ID_MASK	GENMASK(11, 0)
+#define DBGMCU_IDC_REV_ID_MASK	GENMASK(31, 16)
+#define DBGMCU_IDC_REV_ID_SHIFT	16
+
+static int stm32mp1_dbgmcu_init(void)
+{
+	if ((bsec_read_debug_conf() & BSEC_DBGSWGEN) == 0U) {
+		INFO("Software access to all debug components is disabled\n");
+		return -1;
+	}
+
+	mmio_setbits_32(RCC_BASE + RCC_DBGCFGR, RCC_DBGCFGR_DBGCKEN);
+
+	return 0;
+}
+
+/*
+ * @brief  Get silicon revision from DBGMCU registers.
+ * @param  chip_version: pointer to the read value.
+ * @retval 0 on success, negative value on failure.
+ */
+int stm32mp1_dbgmcu_get_chip_version(uint32_t *chip_version)
+{
+	assert(chip_version != NULL);
+
+	if (stm32mp1_dbgmcu_init() != 0) {
+		return -EPERM;
+	}
+
+	*chip_version = (mmio_read_32(DBGMCU_BASE + DBGMCU_IDC) &
+			 DBGMCU_IDC_REV_ID_MASK) >> DBGMCU_IDC_REV_ID_SHIFT;
+
+	return 0;
+}
+
+/*
+ * @brief  Get device ID from DBGMCU registers.
+ * @param  chip_dev_id: pointer to the read value.
+ * @retval 0 on success, negative value on failure.
+ */
+int stm32mp1_dbgmcu_get_chip_dev_id(uint32_t *chip_dev_id)
+{
+	assert(chip_dev_id != NULL);
+
+	if (stm32mp1_dbgmcu_init() != 0) {
+		return -EPERM;
+	}
+
+	*chip_dev_id = mmio_read_32(DBGMCU_BASE + DBGMCU_IDC) &
+		       DBGMCU_IDC_DEV_ID_MASK;
+
+	return 0;
+}