intel_mid: Add Mrst & Mfld DMA Drivers

This patch add DMA drivers for DMA controllers in Langwell chipset
of Intel(R) Moorestown platform and DMA controllers in Penwell of
Intel(R) Medfield platfrom

This patch adds support for Moorestown DMAC1 and DMAC2 controllers.
It also add support for Medfiled GP DMA and DMAC1 controllers.
These controllers supports memory to peripheral and peripheral to
memory transfers. It support only single block transfers.

This driver is based on Kernel DMA engine
Anyone who wishes to use this controller should use DMA engine APIs

This controller exposes DMA_SLAVE capabilities and notifies the client drivers
of DMA transaction completion

Config option required to be enabled CONFIG_INTEL_MID_DMAC=y

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/include/linux/intel_mid_dma.h b/include/linux/intel_mid_dma.h
new file mode 100644
index 0000000..d9d08b6
--- /dev/null
+++ b/include/linux/intel_mid_dma.h
@@ -0,0 +1,86 @@
+/*
+ *  intel_mid_dma.h - Intel MID DMA Drivers
+ *
+ *  Copyright (C) 2008-10 Intel Corp
+ *  Author: Vinod Koul <vinod.koul@intel.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; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *
+ */
+#ifndef __INTEL_MID_DMA_H__
+#define __INTEL_MID_DMA_H__
+
+#include <linux/dmaengine.h>
+
+/*DMA transaction width, src and dstn width would be same
+The DMA length must be width aligned,
+for 32 bit width the length must be 32 bit (4bytes) aligned only*/
+enum intel_mid_dma_width {
+	LNW_DMA_WIDTH_8BIT = 0x0,
+	LNW_DMA_WIDTH_16BIT = 0x1,
+	LNW_DMA_WIDTH_32BIT = 0x2,
+};
+
+/*DMA mode configurations*/
+enum intel_mid_dma_mode {
+	LNW_DMA_PER_TO_MEM = 0, /*periphral to memory configuration*/
+	LNW_DMA_MEM_TO_PER,	/*memory to periphral configuration*/
+	LNW_DMA_MEM_TO_MEM,	/*mem to mem confg (testing only)*/
+};
+
+/*DMA handshaking*/
+enum intel_mid_dma_hs_mode {
+	LNW_DMA_HW_HS = 0,	/*HW Handshaking only*/
+	LNW_DMA_SW_HS = 1,	/*SW Handshaking not recommended*/
+};
+
+/*Burst size configuration*/
+enum intel_mid_dma_msize {
+	LNW_DMA_MSIZE_1 = 0x0,
+	LNW_DMA_MSIZE_4 = 0x1,
+	LNW_DMA_MSIZE_8 = 0x2,
+	LNW_DMA_MSIZE_16 = 0x3,
+	LNW_DMA_MSIZE_32 = 0x4,
+	LNW_DMA_MSIZE_64 = 0x5,
+};
+
+/**
+ * struct intel_mid_dma_slave - DMA slave structure
+ *
+ * @dirn: DMA trf direction
+ * @src_width: tx register width
+ * @dst_width: rx register width
+ * @hs_mode: HW/SW handshaking mode
+ * @cfg_mode: DMA data transfer mode (per-per/mem-per/mem-mem)
+ * @src_msize: Source DMA burst size
+ * @dst_msize: Dst DMA burst size
+ * @device_instance: DMA peripheral device instance, we can have multiple
+ *		peripheral device connected to single DMAC
+ */
+struct intel_mid_dma_slave {
+	enum dma_data_direction		dirn;
+	enum intel_mid_dma_width	src_width; /*width of DMA src txn*/
+	enum intel_mid_dma_width	dst_width; /*width of DMA dst txn*/
+	enum intel_mid_dma_hs_mode	hs_mode;  /*handshaking*/
+	enum intel_mid_dma_mode		cfg_mode; /*mode configuration*/
+	enum intel_mid_dma_msize	src_msize; /*size if src burst*/
+	enum intel_mid_dma_msize	dst_msize; /*size of dst burst*/
+	unsigned int		device_instance; /*0, 1 for periphral instance*/
+};
+
+#endif /*__INTEL_MID_DMA_H__*/