MIPS: JZ4740: Add DMA support.

Add support for DMA transfers on JZ4740 SoCs.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1401/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 90 insertions, 0 deletions

diff --git a/arch/mips/include/asm/mach-jz4740/dma.h b/arch/mips/include/asm/mach-jz4740/dma.h
new file mode 100644
index 000000000000..a3be12183599
--- /dev/null
+++ b/arch/mips/include/asm/mach-jz4740/dma.h
@@ -0,0 +1,90 @@
+/*
+ *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
+ *  JZ7420/JZ4740 DMA definitions
+ *
+ *  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.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifndef __ASM_MACH_JZ4740_DMA_H__
+#define __ASM_MACH_JZ4740_DMA_H__
+
+struct jz4740_dma_chan;
+
+enum jz4740_dma_request_type {
+	JZ4740_DMA_TYPE_AUTO_REQUEST	= 8,
+	JZ4740_DMA_TYPE_UART_TRANSMIT	= 20,
+	JZ4740_DMA_TYPE_UART_RECEIVE	= 21,
+	JZ4740_DMA_TYPE_SPI_TRANSMIT	= 22,
+	JZ4740_DMA_TYPE_SPI_RECEIVE	= 23,
+	JZ4740_DMA_TYPE_AIC_TRANSMIT	= 24,
+	JZ4740_DMA_TYPE_AIC_RECEIVE	= 25,
+	JZ4740_DMA_TYPE_MMC_TRANSMIT	= 26,
+	JZ4740_DMA_TYPE_MMC_RECEIVE	= 27,
+	JZ4740_DMA_TYPE_TCU		= 28,
+	JZ4740_DMA_TYPE_SADC		= 29,
+	JZ4740_DMA_TYPE_SLCD		= 30,
+};
+
+enum jz4740_dma_width {
+	JZ4740_DMA_WIDTH_32BIT	= 0,
+	JZ4740_DMA_WIDTH_8BIT	= 1,
+	JZ4740_DMA_WIDTH_16BIT	= 2,
+};
+
+enum jz4740_dma_transfer_size {
+	JZ4740_DMA_TRANSFER_SIZE_4BYTE  = 0,
+	JZ4740_DMA_TRANSFER_SIZE_1BYTE  = 1,
+	JZ4740_DMA_TRANSFER_SIZE_2BYTE  = 2,
+	JZ4740_DMA_TRANSFER_SIZE_16BYTE = 3,
+	JZ4740_DMA_TRANSFER_SIZE_32BYTE = 4,
+};
+
+enum jz4740_dma_flags {
+	JZ4740_DMA_SRC_AUTOINC = 0x2,
+	JZ4740_DMA_DST_AUTOINC = 0x1,
+};
+
+enum jz4740_dma_mode {
+	JZ4740_DMA_MODE_SINGLE	= 0,
+	JZ4740_DMA_MODE_BLOCK	= 1,
+};
+
+struct jz4740_dma_config {
+	enum jz4740_dma_width src_width;
+	enum jz4740_dma_width dst_width;
+	enum jz4740_dma_transfer_size transfer_size;
+	enum jz4740_dma_request_type request_type;
+	enum jz4740_dma_flags flags;
+	enum jz4740_dma_mode mode;
+};
+
+typedef void (*jz4740_dma_complete_callback_t)(struct jz4740_dma_chan *, int, void *);
+
+struct jz4740_dma_chan *jz4740_dma_request(void *dev, const char *name);
+void jz4740_dma_free(struct jz4740_dma_chan *dma);
+
+void jz4740_dma_configure(struct jz4740_dma_chan *dma,
+	const struct jz4740_dma_config *config);
+
+
+void jz4740_dma_enable(struct jz4740_dma_chan *dma);
+void jz4740_dma_disable(struct jz4740_dma_chan *dma);
+
+void jz4740_dma_set_src_addr(struct jz4740_dma_chan *dma, dma_addr_t src);
+void jz4740_dma_set_dst_addr(struct jz4740_dma_chan *dma, dma_addr_t dst);
+void jz4740_dma_set_transfer_count(struct jz4740_dma_chan *dma, uint32_t count);
+
+uint32_t jz4740_dma_get_residue(const struct jz4740_dma_chan *dma);
+
+void jz4740_dma_set_complete_cb(struct jz4740_dma_chan *dma,
+	jz4740_dma_complete_callback_t cb);
+
+#endif  /* __ASM_JZ4740_DMA_H__ */