marvell: drivers: Add L3/system cache management drivers

Add LLC (L3) cache management drivers for Marvell SoCs
AP806, AP807 and AP810

Change-Id: Ic70710f9bc5b6b48395d62212df7011e2fbb5894
Signed-off-by: Hanna Hawa <hannah@marvell.com>
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>

drivers/marvell/cache_llc.c

+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ * https://spdx.org/licenses
+ */
+
+/* LLC driver is the Last Level Cache (L3C) driver
+ * for Marvell SoCs in AP806, AP807, and AP810
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <cache_llc.h>
+#include <ccu.h>
+#include <mmio.h>
+#include <mvebu_def.h>
+
+#define CCU_HTC_CR(ap_index)		(MVEBU_CCU_BASE(ap_index) + 0x200)
+#define CCU_SET_POC_OFFSET		5
+
+extern void ca72_l2_enable_unique_clean(void);
+
+void llc_cache_sync(int ap_index)
+{
+	mmio_write_32(LLC_SYNC(ap_index), 0);
+	/* Atomic write, no need to wait */
+}
+
+void llc_flush_all(int ap_index)
+{
+	mmio_write_32(L2X0_CLEAN_INV_WAY(ap_index), LLC_WAY_MASK);
+	llc_cache_sync(ap_index);
+}
+
+void llc_clean_all(int ap_index)
+{
+	mmio_write_32(L2X0_CLEAN_WAY(ap_index), LLC_WAY_MASK);
+	llc_cache_sync(ap_index);
+}
+
+void llc_inv_all(int ap_index)
+{
+	mmio_write_32(L2X0_INV_WAY(ap_index), LLC_WAY_MASK);
+	llc_cache_sync(ap_index);
+}
+
+void llc_disable(int ap_index)
+{
+	llc_flush_all(ap_index);
+	mmio_write_32(LLC_CTRL(ap_index), 0);
+	dsbishst();
+}
+
+void llc_enable(int ap_index, int excl_mode)
+{
+	uint32_t val;
+
+	dsbsy();
+	llc_inv_all(ap_index);
+	dsbsy();
+
+	val = LLC_CTRL_EN;
+	if (excl_mode)
+		val |= LLC_EXCLUSIVE_EN;
+
+	mmio_write_32(LLC_CTRL(ap_index), val);
+	dsbsy();
+}
+
+int llc_is_exclusive(int ap_index)
+{
+	uint32_t reg;
+
+	reg = mmio_read_32(LLC_CTRL(ap_index));
+
+	if ((reg & (LLC_CTRL_EN | LLC_EXCLUSIVE_EN)) ==
+		   (LLC_CTRL_EN | LLC_EXCLUSIVE_EN))
+		return 1;
+
+	return 0;
+}
+
+void llc_runtime_enable(int ap_index)
+{
+	uint32_t reg;
+
+	reg = mmio_read_32(LLC_CTRL(ap_index));
+	if (reg & LLC_CTRL_EN)
+		return;
+
+	INFO("Enabling LLC\n");
+
+	/*
+	 * Enable L2 UniqueClean evictions with data
+	 *  Note: this configuration assumes that LLC is configured
+	 *	  in exclusive mode.
+	 *	  Later on in the code this assumption will be validated
+	 */
+	ca72_l2_enable_unique_clean();
+	llc_enable(ap_index, 1);
+
+	/* Set point of coherency to DDR.
+	 * This is required by units which have SW cache coherency
+	 */
+	reg = mmio_read_32(CCU_HTC_CR(ap_index));
+	reg |= (0x1 << CCU_SET_POC_OFFSET);
+	mmio_write_32(CCU_HTC_CR(ap_index), reg);
+}

include/drivers/marvell/cache_llc.h

+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ * https://spdx.org/licenses
+ */
+
+/* LLC driver is the Last Level Cache (L3C) driver
+ * for Marvell SoCs in AP806, AP807, and AP810
+ */
+
+#ifndef _CACHE_LLC_H_
+#define _CACHE_LLC_H_
+
+#define LLC_CTRL(ap)			(MVEBU_LLC_BASE(ap) + 0x100)
+#define LLC_SYNC(ap)			(MVEBU_LLC_BASE(ap) + 0x700)
+#define L2X0_INV_WAY(ap)		(MVEBU_LLC_BASE(ap) + 0x77C)
+#define L2X0_CLEAN_WAY(ap)		(MVEBU_LLC_BASE(ap) + 0x7BC)
+#define L2X0_CLEAN_INV_WAY(ap)		(MVEBU_LLC_BASE(ap) + 0x7FC)
+#define LLC_TC0_LOCK(ap)		(MVEBU_LLC_BASE(ap) + 0x920)
+
+#define MASTER_LLC_CTRL			LLC_CTRL(MVEBU_AP0)
+#define MASTER_L2X0_INV_WAY		L2X0_INV_WAY(MVEBU_AP0)
+#define MASTER_LLC_TC0_LOCK		LLC_TC0_LOCK(MVEBU_AP0)
+
+#define LLC_CTRL_EN			1
+#define LLC_EXCLUSIVE_EN		0x100
+#define LLC_WAY_MASK			0xFFFFFFFF
+
+#ifndef __ASSEMBLY__
+void llc_cache_sync(int ap_index);
+void llc_flush_all(int ap_index);
+void llc_clean_all(int ap_index);
+void llc_inv_all(int ap_index);
+void llc_disable(int ap_index);
+void llc_enable(int ap_index, int excl_mode);
+int llc_is_exclusive(int ap_index);
+void llc_runtime_enable(int ap_index);
+#endif
+
+#endif /* _CACHE_LLC_H_ */
+