rcar_gen3: drivers: dma

Signed-off-by: ldts <jramirez@baylibre.com>

drivers/renesas/rcar/dma/dma_driver.c

+/*
+ * Copyright (c) 2015-2018, Renesas Electronics Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdint.h>
+#include <arch_helpers.h>
+#include <string.h>
+#include <mmio.h>
+#include "rcar_def.h"
+#include "cpg_registers.h"
+#include "debug.h"
+#include "rcar_private.h"
+
+/* DMA CHANNEL setting (0/16/32) */
+#define	DMA_CH		0
+
+#if (DMA_CH == 0)
+#define SYS_DMAC_BIT	((uint32_t)1U << 19U)
+#define DMA_BASE	(0xE6700000U)
+#elif (DMA_CH == 16)
+#define SYS_DMAC_BIT	((uint32_t)1U << 18U)
+#define DMA_BASE	(0xE7300000U)
+#elif (DMA_CH == 32)
+#define SYS_DMAC_BIT	((uint32_t)1U << 17U)
+#define DMA_BASE	(0xE7320000U)
+#else
+#define SYS_DMAC_BIT	((uint32_t)1U << 19U)
+#define DMA_BASE	(0xE6700000U)
+#endif
+
+/* DMA operation */
+#define DMA_DMAOR	(DMA_BASE + 0x0060U)
+/* DMA secure control */
+#define	DMA_DMASEC	(DMA_BASE + 0x0030U)
+/* DMA channel clear */
+#define DMA_DMACHCLR	(DMA_BASE + 0x0080U)
+/* DMA source address */
+#define DMA_DMASAR	(DMA_BASE + 0x8000U)
+/* DMA destination address */
+#define DMA_DMADAR	(DMA_BASE + 0x8004U)
+/* DMA transfer count */
+#define DMA_DMATCR	(DMA_BASE + 0x8008U)
+/* DMA channel control */
+#define DMA_DMACHCR	(DMA_BASE + 0x800CU)
+/* DMA fixed destination address */
+#define DMA_DMAFIXDAR	(DMA_BASE + 0x8014U)
+
+#define	DMA_USE_CHANNEL		(0x00000001U)
+#define	DMAOR_INITIAL		(0x0301U)
+#define	DMACHCLR_CH_ALL		(0x0000FFFFU)
+#define	DMAFIXDAR_32BIT_SHIFT	(32U)
+#define	DMAFIXDAR_DAR_MASK	(0x000000FFU)
+#define	DMADAR_BOUNDARY_ADDR	(0x100000000ULL)
+#define	DMATCR_CNT_SHIFT	(6U)
+#define	DMATCR_MAX		(0x00FFFFFFU)
+#define	DMACHCR_TRN_MODE	(0x00105409U)
+#define	DMACHCR_DE_BIT		(0x00000001U)
+#define	DMACHCR_TE_BIT		(0x00000002U)
+#define	DMACHCR_CHE_BIT		(0x80000000U)
+
+#define	DMA_SIZE_UNIT		FLASH_TRANS_SIZE_UNIT
+#define	DMA_FRACTION_MASK	(0xFFU)
+#define DMA_DST_LIMIT		(0x10000000000ULL)
+
+/* transfer length limit */
+#define DMA_LENGTH_LIMIT	((DMATCR_MAX * (1U << DMATCR_CNT_SHIFT)) \
+				& ~DMA_FRACTION_MASK)
+
+static void dma_enable(void)
+{
+	mstpcr_write(CPG_SMSTPCR2, CPG_MSTPSR2, SYS_DMAC_BIT);
+}
+
+static void dma_setup(void)
+{
+	mmio_write_16(DMA_DMAOR, 0);
+	mmio_write_32(DMA_DMACHCLR, DMACHCLR_CH_ALL);
+}
+
+static void dma_start(uintptr_t dst, uint32_t src, uint32_t len)
+{
+	mmio_write_16(DMA_DMAOR, DMAOR_INITIAL);
+	mmio_write_32(DMA_DMAFIXDAR, (dst >> DMAFIXDAR_32BIT_SHIFT) &
+		      DMAFIXDAR_DAR_MASK);
+	mmio_write_32(DMA_DMADAR, dst & UINT32_MAX);
+	mmio_write_32(DMA_DMASAR, src);
+	mmio_write_32(DMA_DMATCR, len >> DMATCR_CNT_SHIFT);
+	mmio_write_32(DMA_DMASEC, DMA_USE_CHANNEL);
+	mmio_write_32(DMA_DMACHCR, DMACHCR_TRN_MODE);
+}
+
+static void dma_end(void)
+{
+	while ((mmio_read_32(DMA_DMACHCR) & DMACHCR_TE_BIT) == 0) {
+		if ((mmio_read_32(DMA_DMACHCR) & DMACHCR_CHE_BIT) != 0U) {
+			ERROR("BL2: DMA - Channel Address Error\n");
+			panic();
+			break;
+		}
+	}
+	/* DMA transfer Disable */
+	mmio_clrbits_32(DMA_DMACHCR, DMACHCR_DE_BIT);
+	while ((mmio_read_32(DMA_DMACHCR) & DMACHCR_DE_BIT) != 0)
+		;
+
+	mmio_write_32(DMA_DMASEC, 0);
+	mmio_write_16(DMA_DMAOR, 0);
+	mmio_write_32(DMA_DMACHCLR, DMA_USE_CHANNEL);
+}
+
+void rcar_dma_exec(uintptr_t dst, uint32_t src, uint32_t len)
+{
+	uint32_t dma_len = len;
+
+	if (len & DMA_FRACTION_MASK)
+		dma_len = (len + DMA_SIZE_UNIT) & ~DMA_FRACTION_MASK;
+
+	if (!dma_len || dma_len > DMA_LENGTH_LIMIT) {
+		ERROR("BL2: DMA - size invalid, length (0x%x)\n", dma_len);
+		panic();
+	}
+
+	if (src & DMA_FRACTION_MASK) {
+		ERROR("BL2: DMA - source address invalid (0x%x), "
+			"length (0x%x)\n", src, dma_len);
+		panic();
+	}
+
+	if ((dst & UINT32_MAX) + dma_len > DMADAR_BOUNDARY_ADDR	||
+	    (dst + dma_len > DMA_DST_LIMIT)			||
+	    (dst & DMA_FRACTION_MASK)) {
+		ERROR("BL2: DMA - destination address invalid (0x%lx), "
+		      "length (0x%x)\n", dst, dma_len);
+		panic();
+	}
+
+	dma_start(dst, src, dma_len);
+	dma_end();
+}
+
+void rcar_dma_init(void)
+{
+	dma_enable();
+	dma_setup();
+}