1 files changed, 132 insertions, 0 deletions
diff --git a/plat/intel/soc/common/drivers/ccu/ncore_ccu.c b/plat/intel/soc/common/drivers/ccu/ncore_ccu.c
new file mode 100644
index 0000000..d9a238e
--- /dev/null
+++ b/plat/intel/soc/common/drivers/ccu/ncore_ccu.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2019-2022, Intel Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <common/debug.h>
+#include <errno.h>
+#include <lib/mmio.h>
+
+#include "ncore_ccu.h"
+
+uint32_t poll_active_bit(uint32_t dir);
+
+static coh_ss_id_t subsystem_id;
+
+
+void get_subsystem_id(void)
+{
+	uint32_t snoop_filter, directory, coh_agent;
+
+	snoop_filter = CSIDR_NUM_SF(mmio_read_32(NCORE_CCU_CSR(NCORE_CSIDR)));
+	directory = CSUIDR_NUM_DIR(mmio_read_32(NCORE_CCU_CSR(NCORE_CSUIDR)));
+	coh_agent = CSUIDR_NUM_CAI(mmio_read_32(NCORE_CCU_CSR(NCORE_CSUIDR)));
+
+	subsystem_id.num_snoop_filter = snoop_filter + 1;
+	subsystem_id.num_directory = directory;
+	subsystem_id.num_coh_agent = coh_agent;
+}
+
+uint32_t directory_init(void)
+{
+	uint32_t dir_sf_mtn, dir_sf_en;
+	uint32_t dir, sf, ret;
+
+	for (dir = 0; dir < subsystem_id.num_directory; dir++) {
+		for (sf = 0; sf < subsystem_id.num_snoop_filter; sf++) {
+			dir_sf_mtn = DIRECTORY_UNIT(dir, NCORE_DIRUSFMCR);
+			dir_sf_en = DIRECTORY_UNIT(dir, NCORE_DIRUSFER);
+
+			/* Initialize All Entries */
+			mmio_write_32(dir_sf_mtn, SNOOP_FILTER_ID(dir));
+
+			/* Poll Active Bit */
+			ret = poll_active_bit(dir);
+			if (ret != 0) {
+				ERROR("Timeout during active bit polling");
+				return -ETIMEDOUT;
+			}
+
+			/* Snoope Filter Enable */
+			mmio_setbits_32(dir_sf_en, BIT(sf));
+		}
+	}
+
+	return 0;
+}
+
+uint32_t coherent_agent_intfc_init(void)
+{
+	uint32_t dir, ca, ca_id, ca_type, ca_snoop_en;
+
+	for (dir = 0; dir < subsystem_id.num_directory; dir++) {
+		for (ca = 0; ca < subsystem_id.num_coh_agent; ca++) {
+			ca_snoop_en = DIRECTORY_UNIT(ca, NCORE_DIRUCASER0);
+			ca_id = mmio_read_32(COH_AGENT_UNIT(ca, NCORE_CAIUIDR));
+
+			/* Coh Agent Snoop Enable */
+			if (CACHING_AGENT_BIT(ca_id))
+				mmio_write_32(ca_snoop_en, BIT(ca));
+
+			/* Coh Agent Snoop DVM Enable */
+			ca_type = CACHING_AGENT_TYPE(ca_id);
+			if (ca_type == ACE_W_DVM || ca_type == ACE_L_W_DVM)
+				mmio_write_32(NCORE_CCU_CSR(NCORE_CSADSER0),
+				BIT(ca));
+		}
+	}
+
+	return 0;
+}
+
+uint32_t poll_active_bit(uint32_t dir)
+{
+	uint32_t timeout = 80000;
+	uint32_t poll_dir =  DIRECTORY_UNIT(dir, NCORE_DIRUSFMAR);
+
+	while (timeout > 0) {
+		if (mmio_read_32(poll_dir) == 0)
+			return 0;
+		timeout--;
+	}
+
+	return -1;
+}
+
+void bypass_ocram_firewall(void)
+{
+	mmio_clrbits_32(COH_CPU0_BYPASS_REG(NCORE_FW_OCRAM_BLK_CGF1),
+			OCRAM_PRIVILEGED_MASK | OCRAM_SECURE_MASK);
+	mmio_clrbits_32(COH_CPU0_BYPASS_REG(NCORE_FW_OCRAM_BLK_CGF2),
+			OCRAM_PRIVILEGED_MASK | OCRAM_SECURE_MASK);
+	mmio_clrbits_32(COH_CPU0_BYPASS_REG(NCORE_FW_OCRAM_BLK_CGF3),
+			OCRAM_PRIVILEGED_MASK | OCRAM_SECURE_MASK);
+	mmio_clrbits_32(COH_CPU0_BYPASS_REG(NCORE_FW_OCRAM_BLK_CGF4),
+			OCRAM_PRIVILEGED_MASK | OCRAM_SECURE_MASK);
+}
+
+void ncore_enable_ocram_firewall(void)
+{
+	mmio_setbits_32(COH_CPU0_BYPASS_REG(NCORE_FW_OCRAM_BLK_CGF1),
+			OCRAM_PRIVILEGED_MASK | OCRAM_SECURE_MASK);
+	mmio_setbits_32(COH_CPU0_BYPASS_REG(NCORE_FW_OCRAM_BLK_CGF2),
+			OCRAM_PRIVILEGED_MASK | OCRAM_SECURE_MASK);
+	mmio_setbits_32(COH_CPU0_BYPASS_REG(NCORE_FW_OCRAM_BLK_CGF3),
+			OCRAM_PRIVILEGED_MASK | OCRAM_SECURE_MASK);
+	mmio_setbits_32(COH_CPU0_BYPASS_REG(NCORE_FW_OCRAM_BLK_CGF4),
+			OCRAM_PRIVILEGED_MASK | OCRAM_SECURE_MASK);
+}
+
+uint32_t init_ncore_ccu(void)
+{
+	uint32_t status;
+
+	get_subsystem_id();
+	status = directory_init();
+	status = coherent_agent_intfc_init();
+	bypass_ocram_firewall();
+
+	return status;
+}