iMX28: Add APBH DMA driver

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>

1 files changed, 170 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-mx28/dma.h b/arch/arm/include/asm/arch-mx28/dma.h
new file mode 100644
index 0000000000..7061e7c2fe
--- /dev/null
+++ b/arch/arm/include/asm/arch-mx28/dma.h
@@ -0,0 +1,170 @@
+/*
+ * Freescale i.MX28 APBH DMA
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * Based on code from LTIB:
+ * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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.
+ *
+ * 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 __DMA_H__
+#define __DMA_H__
+
+#include <linux/list.h>
+
+#ifndef	CONFIG_ARCH_DMA_PIO_WORDS
+#define	DMA_PIO_WORDS		15
+#else
+#define	DMA_PIO_WORDS		CONFIG_ARCH_DMA_PIO_WORDS
+#endif
+
+#define MXS_DMA_ALIGNMENT	32
+
+/*
+ * MXS DMA channels
+ */
+enum {
+	MXS_DMA_CHANNEL_AHB_APBH_SSP0 = 0,
+	MXS_DMA_CHANNEL_AHB_APBH_SSP1,
+	MXS_DMA_CHANNEL_AHB_APBH_SSP2,
+	MXS_DMA_CHANNEL_AHB_APBH_SSP3,
+	MXS_DMA_CHANNEL_AHB_APBH_GPMI0,
+	MXS_DMA_CHANNEL_AHB_APBH_GPMI1,
+	MXS_DMA_CHANNEL_AHB_APBH_GPMI2,
+	MXS_DMA_CHANNEL_AHB_APBH_GPMI3,
+	MXS_DMA_CHANNEL_AHB_APBH_GPMI4,
+	MXS_DMA_CHANNEL_AHB_APBH_GPMI5,
+	MXS_DMA_CHANNEL_AHB_APBH_GPMI6,
+	MXS_DMA_CHANNEL_AHB_APBH_GPMI7,
+	MXS_DMA_CHANNEL_AHB_APBH_SSP,
+	MXS_MAX_DMA_CHANNELS,
+};
+
+/*
+ * MXS DMA hardware command.
+ *
+ * This structure describes the in-memory layout of an entire DMA command,
+ * including space for the maximum number of PIO accesses. See the appropriate
+ * reference manual for a detailed description of what these fields mean to the
+ * DMA hardware.
+ */
+#define	MXS_DMA_DESC_COMMAND_MASK	0x3
+#define	MXS_DMA_DESC_COMMAND_OFFSET	0
+#define	MXS_DMA_DESC_COMMAND_NO_DMAXFER	0x0
+#define	MXS_DMA_DESC_COMMAND_DMA_WRITE	0x1
+#define	MXS_DMA_DESC_COMMAND_DMA_READ	0x2
+#define	MXS_DMA_DESC_COMMAND_DMA_SENSE	0x3
+#define	MXS_DMA_DESC_CHAIN		(1 << 2)
+#define	MXS_DMA_DESC_IRQ		(1 << 3)
+#define	MXS_DMA_DESC_NAND_LOCK		(1 << 4)
+#define	MXS_DMA_DESC_NAND_WAIT_4_READY	(1 << 5)
+#define	MXS_DMA_DESC_DEC_SEM		(1 << 6)
+#define	MXS_DMA_DESC_WAIT4END		(1 << 7)
+#define	MXS_DMA_DESC_HALT_ON_TERMINATE	(1 << 8)
+#define	MXS_DMA_DESC_TERMINATE_FLUSH	(1 << 9)
+#define	MXS_DMA_DESC_PIO_WORDS_MASK	(0xf << 12)
+#define	MXS_DMA_DESC_PIO_WORDS_OFFSET	12
+#define	MXS_DMA_DESC_BYTES_MASK		(0xffff << 16)
+#define	MXS_DMA_DESC_BYTES_OFFSET	16
+
+struct mxs_dma_cmd {
+	unsigned long		next;
+	unsigned long		data;
+	union {
+		dma_addr_t	address;
+		unsigned long	alternate;
+	};
+	unsigned long		pio_words[DMA_PIO_WORDS];
+};
+
+/*
+ * MXS DMA command descriptor.
+ *
+ * This structure incorporates an MXS DMA hardware command structure, along
+ * with metadata.
+ */
+#define	MXS_DMA_DESC_FIRST	(1 << 0)
+#define	MXS_DMA_DESC_LAST	(1 << 1)
+#define	MXS_DMA_DESC_READY	(1 << 31)
+
+struct mxs_dma_desc {
+	struct mxs_dma_cmd	cmd;
+	unsigned int		flags;
+	dma_addr_t		address;
+	void			*buffer;
+	struct list_head	node;
+};
+
+/**
+ * MXS DMA channel
+ *
+ * This structure represents a single DMA channel. The MXS platform code
+ * maintains an array of these structures to represent every DMA channel in the
+ * system (see mxs_dma_channels).
+ */
+#define	MXS_DMA_FLAGS_IDLE	0
+#define	MXS_DMA_FLAGS_BUSY	(1 << 0)
+#define	MXS_DMA_FLAGS_FREE	0
+#define	MXS_DMA_FLAGS_ALLOCATED	(1 << 16)
+#define	MXS_DMA_FLAGS_VALID	(1 << 31)
+
+struct mxs_dma_chan {
+	const char *name;
+	unsigned long dev;
+	struct mxs_dma_device *dma;
+	unsigned int flags;
+	unsigned int active_num;
+	unsigned int pending_num;
+	struct list_head active;
+	struct list_head done;
+};
+
+/* Hardware management ops */
+int mxs_dma_enable(int channel);
+int mxs_dma_disable(int channel);
+int mxs_dma_reset(int channel);
+int mxs_dma_freeze(int channel);
+int mxs_dma_unfreeze(int channel);
+int mxs_dma_read_semaphore(int channel);
+int mxs_dma_enable_irq(int channel, int enable);
+int mxs_dma_irq_is_pending(int channel);
+int mxs_dma_ack_irq(int channel);
+
+/* Channel management ops */
+int mxs_dma_request(int channel);
+int mxs_dma_release(int channel);
+
+/* Descriptor management ops */
+struct mxs_dma_desc *mxs_dma_desc_alloc(void);
+void mxs_dma_desc_free(struct mxs_dma_desc *);
+
+unsigned int mxs_dma_cmd_address(struct mxs_dma_desc *desc);
+int mxs_dma_desc_pending(struct mxs_dma_desc *pdesc);
+
+int mxs_dma_desc_append(int channel, struct mxs_dma_desc *pdesc);
+
+int mxs_dma_get_finished(int channel, struct list_head *head);
+int mxs_dma_finish(int channel, struct list_head *head);
+
+int mxs_dma_wait_complete(uint32_t timeout, unsigned int chan);
+int mxs_dma_go(int chan);
+
+int mxs_dma_init(void);
+
+#endif	/* __DMA_H__ */