1 files changed, 114 insertions, 0 deletions
diff --git a/arch/arm/mach-ep93xx/dma.c b/arch/arm/mach-ep93xx/dma.c
new file mode 100644
index 000000000..74515acab
--- /dev/null
+++ b/arch/arm/mach-ep93xx/dma.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * arch/arm/mach-ep93xx/dma.c
+ *
+ * Platform support code for the EP93xx dmaengine driver.
+ *
+ * Copyright (C) 2011 Mika Westerberg
+ *
+ * This work is based on the original dma-m2p implementation with
+ * following copyrights:
+ *
+ *   Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
+ *   Copyright (C) 2006 Applied Data Systems
+ *   Copyright (C) 2009 Ryan Mallon <rmallon@gmail.com>
+ */
+
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+
+#include <linux/platform_data/dma-ep93xx.h>
+#include "hardware.h"
+
+#include "soc.h"
+
+#define DMA_CHANNEL(_name, _base, _irq) \
+	{ .name = (_name), .base = (_base), .irq = (_irq) }
+
+/*
+ * DMA M2P channels.
+ *
+ * On the EP93xx chip the following peripherals my be allocated to the 10
+ * Memory to Internal Peripheral (M2P) channels (5 transmit + 5 receive).
+ *
+ *	I2S	contains 3 Tx and 3 Rx DMA Channels
+ *	AAC	contains 3 Tx and 3 Rx DMA Channels
+ *	UART1	contains 1 Tx and 1 Rx DMA Channels
+ *	UART2	contains 1 Tx and 1 Rx DMA Channels
+ *	UART3	contains 1 Tx and 1 Rx DMA Channels
+ *	IrDA	contains 1 Tx and 1 Rx DMA Channels
+ *
+ * Registers are mapped statically in ep93xx_map_io().
+ */
+static struct ep93xx_dma_chan_data ep93xx_dma_m2p_channels[] = {
+	DMA_CHANNEL("m2p0", EP93XX_DMA_BASE + 0x0000, IRQ_EP93XX_DMAM2P0),
+	DMA_CHANNEL("m2p1", EP93XX_DMA_BASE + 0x0040, IRQ_EP93XX_DMAM2P1),
+	DMA_CHANNEL("m2p2", EP93XX_DMA_BASE + 0x0080, IRQ_EP93XX_DMAM2P2),
+	DMA_CHANNEL("m2p3", EP93XX_DMA_BASE + 0x00c0, IRQ_EP93XX_DMAM2P3),
+	DMA_CHANNEL("m2p4", EP93XX_DMA_BASE + 0x0240, IRQ_EP93XX_DMAM2P4),
+	DMA_CHANNEL("m2p5", EP93XX_DMA_BASE + 0x0200, IRQ_EP93XX_DMAM2P5),
+	DMA_CHANNEL("m2p6", EP93XX_DMA_BASE + 0x02c0, IRQ_EP93XX_DMAM2P6),
+	DMA_CHANNEL("m2p7", EP93XX_DMA_BASE + 0x0280, IRQ_EP93XX_DMAM2P7),
+	DMA_CHANNEL("m2p8", EP93XX_DMA_BASE + 0x0340, IRQ_EP93XX_DMAM2P8),
+	DMA_CHANNEL("m2p9", EP93XX_DMA_BASE + 0x0300, IRQ_EP93XX_DMAM2P9),
+};
+
+static struct ep93xx_dma_platform_data ep93xx_dma_m2p_data = {
+	.channels		= ep93xx_dma_m2p_channels,
+	.num_channels		= ARRAY_SIZE(ep93xx_dma_m2p_channels),
+};
+
+static u64 ep93xx_dma_m2p_mask = DMA_BIT_MASK(32);
+
+static struct platform_device ep93xx_dma_m2p_device = {
+	.name			= "ep93xx-dma-m2p",
+	.id			= -1,
+	.dev			= {
+		.platform_data		= &ep93xx_dma_m2p_data,
+		.dma_mask		= &ep93xx_dma_m2p_mask,
+		.coherent_dma_mask	= DMA_BIT_MASK(32),
+	},
+};
+
+/*
+ * DMA M2M channels.
+ *
+ * There are 2 M2M channels which support memcpy/memset and in addition simple
+ * hardware requests from/to SSP and IDE. We do not implement an external
+ * hardware requests.
+ *
+ * Registers are mapped statically in ep93xx_map_io().
+ */
+static struct ep93xx_dma_chan_data ep93xx_dma_m2m_channels[] = {
+	DMA_CHANNEL("m2m0", EP93XX_DMA_BASE + 0x0100, IRQ_EP93XX_DMAM2M0),
+	DMA_CHANNEL("m2m1", EP93XX_DMA_BASE + 0x0140, IRQ_EP93XX_DMAM2M1),
+};
+
+static struct ep93xx_dma_platform_data ep93xx_dma_m2m_data = {
+	.channels		= ep93xx_dma_m2m_channels,
+	.num_channels		= ARRAY_SIZE(ep93xx_dma_m2m_channels),
+};
+
+static u64 ep93xx_dma_m2m_mask = DMA_BIT_MASK(32);
+
+static struct platform_device ep93xx_dma_m2m_device = {
+	.name			= "ep93xx-dma-m2m",
+	.id			= -1,
+	.dev			= {
+		.platform_data		= &ep93xx_dma_m2m_data,
+		.dma_mask		= &ep93xx_dma_m2m_mask,
+		.coherent_dma_mask	= DMA_BIT_MASK(32),
+	},
+};
+
+static int __init ep93xx_dma_init(void)
+{
+	platform_device_register(&ep93xx_dma_m2p_device);
+	platform_device_register(&ep93xx_dma_m2m_device);
+	return 0;
+}
+arch_initcall(ep93xx_dma_init);