ep93xx: add dmaengine platform code

Add platform support code for the new EP93xx dmaengine driver.

Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Signed-off-by: Ryan Mallon <rmallon@gmail.com>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

2 files changed, 110 insertions, 0 deletions

diff --git a/arch/arm/mach-ep93xx/Makefile b/arch/arm/mach-ep93xx/Makefile
index 33ee2c863d18..4920f7ae8330 100644
--- a/arch/arm/mach-ep93xx/Makefile
+++ b/arch/arm/mach-ep93xx/Makefile
@@ -6,6 +6,8 @@ obj-m			:=
 obj-n                   :=
 obj-                    :=
 
+obj-$(CONFIG_EP93XX_DMA)        += dma.o
+
 obj-$(CONFIG_MACH_ADSSPHERE)    += adssphere.o
 obj-$(CONFIG_MACH_EDB93XX)      += edb93xx.o
 obj-$(CONFIG_MACH_GESBC9312)    += gesbc9312.o
diff --git a/arch/arm/mach-ep93xx/dma.c b/arch/arm/mach-ep93xx/dma.c
new file mode 100644
index 000000000000..5a2570881255
--- /dev/null
+++ b/arch/arm/mach-ep93xx/dma.c
@@ -0,0 +1,108 @@
+/*
+ * 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>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#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 <mach/dma.h>
+#include <mach/hardware.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 struct platform_device ep93xx_dma_m2p_device = {
+        .name                   = "ep93xx-dma-m2p",
+        .id                     = -1,
+        .dev                    = {
+                .platform_data  = &ep93xx_dma_m2p_data,
+        },
+};
+
+/*
+ * 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 struct platform_device ep93xx_dma_m2m_device = {
+        .name                   = "ep93xx-dma-m2m",
+        .id                     = -1,
+        .dev                    = {
+                .platform_data  = &ep93xx_dma_m2m_data,
+        },
+};
+
+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);