include/linux/omap-dma.h - kernel/msm-4.9 - Gitiles

 /*
  * OMAP DMA Engine support
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 #ifndef __LINUX_OMAP_DMA_H
 #define __LINUX_OMAP_DMA_H

 struct dma_chan;

 #if defined(CONFIG_DMA_OMAP) || defined(CONFIG_DMA_OMAP_MODULE)
 bool omap_dma_filter_fn(struct dma_chan *, void *);
 #else
 static inline bool omap_dma_filter_fn(struct dma_chan *c, void *d)
 {
 	return false;
 }
 #endif

 /*
  *  Legacy OMAP DMA handling defines and functions
  *
  *  NOTE: Do not use these any longer.
  *
  *  Use the generic dmaengine functions as defined in
  *  include/linux/dmaengine.h.
  *
  *  Copyright (C) 2003 Nokia Corporation
  *  Author: Juha Yrjölä <juha.yrjola@nokia.com>
  *
  */

 #include <linux/platform_device.h>

 #define INT_DMA_LCD			25

 #define OMAP1_DMA_TOUT_IRQ		(1 << 0)
 #define OMAP_DMA_DROP_IRQ		(1 << 1)
 #define OMAP_DMA_HALF_IRQ		(1 << 2)
 #define OMAP_DMA_FRAME_IRQ		(1 << 3)
 #define OMAP_DMA_LAST_IRQ		(1 << 4)
 #define OMAP_DMA_BLOCK_IRQ		(1 << 5)
 #define OMAP1_DMA_SYNC_IRQ		(1 << 6)
 #define OMAP2_DMA_PKT_IRQ		(1 << 7)
 #define OMAP2_DMA_TRANS_ERR_IRQ		(1 << 8)
 #define OMAP2_DMA_SECURE_ERR_IRQ	(1 << 9)
 #define OMAP2_DMA_SUPERVISOR_ERR_IRQ	(1 << 10)
 #define OMAP2_DMA_MISALIGNED_ERR_IRQ	(1 << 11)

 #define OMAP_DMA_CCR_EN			(1 << 7)
 #define OMAP_DMA_CCR_RD_ACTIVE		(1 << 9)
 #define OMAP_DMA_CCR_WR_ACTIVE		(1 << 10)
 #define OMAP_DMA_CCR_SEL_SRC_DST_SYNC	(1 << 24)
 #define OMAP_DMA_CCR_BUFFERING_DISABLE	(1 << 25)

 #define OMAP_DMA_DATA_TYPE_S8		0x00
 #define OMAP_DMA_DATA_TYPE_S16		0x01
 #define OMAP_DMA_DATA_TYPE_S32		0x02

 #define OMAP_DMA_SYNC_ELEMENT		0x00
 #define OMAP_DMA_SYNC_FRAME		0x01
 #define OMAP_DMA_SYNC_BLOCK		0x02
 #define OMAP_DMA_SYNC_PACKET		0x03

 #define OMAP_DMA_DST_SYNC_PREFETCH	0x02
 #define OMAP_DMA_SRC_SYNC		0x01
 #define OMAP_DMA_DST_SYNC		0x00

 #define OMAP_DMA_PORT_EMIFF		0x00
 #define OMAP_DMA_PORT_EMIFS		0x01
 #define OMAP_DMA_PORT_OCP_T1		0x02
 #define OMAP_DMA_PORT_TIPB		0x03
 #define OMAP_DMA_PORT_OCP_T2		0x04
 #define OMAP_DMA_PORT_MPUI		0x05

 #define OMAP_DMA_AMODE_CONSTANT		0x00
 #define OMAP_DMA_AMODE_POST_INC		0x01
 #define OMAP_DMA_AMODE_SINGLE_IDX	0x02
 #define OMAP_DMA_AMODE_DOUBLE_IDX	0x03

 #define DMA_DEFAULT_FIFO_DEPTH		0x10
 #define DMA_DEFAULT_ARB_RATE		0x01
 /* Pass THREAD_RESERVE ORed with THREAD_FIFO for tparams */
 #define DMA_THREAD_RESERVE_NORM		(0x00 << 12) /* Def */
 #define DMA_THREAD_RESERVE_ONET		(0x01 << 12)
 #define DMA_THREAD_RESERVE_TWOT		(0x02 << 12)
 #define DMA_THREAD_RESERVE_THREET	(0x03 << 12)
 #define DMA_THREAD_FIFO_NONE		(0x00 << 14) /* Def */
 #define DMA_THREAD_FIFO_75		(0x01 << 14)
 #define DMA_THREAD_FIFO_25		(0x02 << 14)
 #define DMA_THREAD_FIFO_50		(0x03 << 14)

 /* DMA4_OCP_SYSCONFIG bits */
 #define DMA_SYSCONFIG_MIDLEMODE_MASK		(3 << 12)
 #define DMA_SYSCONFIG_CLOCKACTIVITY_MASK	(3 << 8)
 #define DMA_SYSCONFIG_EMUFREE			(1 << 5)
 #define DMA_SYSCONFIG_SIDLEMODE_MASK		(3 << 3)
 #define DMA_SYSCONFIG_SOFTRESET			(1 << 2)
 #define DMA_SYSCONFIG_AUTOIDLE			(1 << 0)

 #define DMA_SYSCONFIG_MIDLEMODE(n)		((n) << 12)
 #define DMA_SYSCONFIG_SIDLEMODE(n)		((n) << 3)

 #define DMA_IDLEMODE_SMARTIDLE			0x2
 #define DMA_IDLEMODE_NO_IDLE			0x1
 #define DMA_IDLEMODE_FORCE_IDLE			0x0

 /* Chaining modes*/
 #ifndef CONFIG_ARCH_OMAP1
 #define OMAP_DMA_STATIC_CHAIN		0x1
 #define OMAP_DMA_DYNAMIC_CHAIN		0x2
 #define OMAP_DMA_CHAIN_ACTIVE		0x1
 #define OMAP_DMA_CHAIN_INACTIVE		0x0
 #endif

 #define DMA_CH_PRIO_HIGH		0x1
 #define DMA_CH_PRIO_LOW			0x0 /* Def */

 /* Errata handling */
 #define IS_DMA_ERRATA(id)		(errata & (id))
 #define SET_DMA_ERRATA(id)		(errata |= (id))

 #define DMA_ERRATA_IFRAME_BUFFERING	BIT(0x0)
 #define DMA_ERRATA_PARALLEL_CHANNELS	BIT(0x1)
 #define DMA_ERRATA_i378			BIT(0x2)
 #define DMA_ERRATA_i541			BIT(0x3)
 #define DMA_ERRATA_i88			BIT(0x4)
 #define DMA_ERRATA_3_3			BIT(0x5)
 #define DMA_ROMCODE_BUG			BIT(0x6)

 /* Attributes for OMAP DMA Contrller */
 #define DMA_LINKED_LCH			BIT(0x0)
 #define GLOBAL_PRIORITY			BIT(0x1)
 #define RESERVE_CHANNEL			BIT(0x2)
 #define IS_CSSA_32			BIT(0x3)
 #define IS_CDSA_32			BIT(0x4)
 #define IS_RW_PRIORITY			BIT(0x5)
 #define ENABLE_1510_MODE		BIT(0x6)
 #define SRC_PORT			BIT(0x7)
 #define DST_PORT			BIT(0x8)
 #define SRC_INDEX			BIT(0x9)
 #define DST_INDEX			BIT(0xa)
 #define IS_BURST_ONLY4			BIT(0xb)
 #define CLEAR_CSR_ON_READ		BIT(0xc)
 #define IS_WORD_16			BIT(0xd)
 #define ENABLE_16XX_MODE		BIT(0xe)
 #define HS_CHANNELS_RESERVED		BIT(0xf)

 /* Defines for DMA Capabilities */
 #define DMA_HAS_TRANSPARENT_CAPS	(0x1 << 18)
 #define DMA_HAS_CONSTANT_FILL_CAPS	(0x1 << 19)
 #define DMA_HAS_DESCRIPTOR_CAPS		(0x3 << 20)

 enum omap_reg_offsets {

 GCR,		GSCR,		GRST1,		HW_ID,
 PCH2_ID,	PCH0_ID,	PCH1_ID,	PCHG_ID,
 PCHD_ID,	CAPS_0,		CAPS_1,		CAPS_2,
 CAPS_3,		CAPS_4,		PCH2_SR,	PCH0_SR,
 PCH1_SR,	PCHD_SR,	REVISION,	IRQSTATUS_L0,
 IRQSTATUS_L1,	IRQSTATUS_L2,	IRQSTATUS_L3,	IRQENABLE_L0,
 IRQENABLE_L1,	IRQENABLE_L2,	IRQENABLE_L3,	SYSSTATUS,
 OCP_SYSCONFIG,

 /* omap1+ specific */
 CPC, CCR2, LCH_CTRL,

 /* Common registers for all omap's */
 CSDP,		CCR,		CICR,		CSR,
 CEN,		CFN,		CSFI,		CSEI,
 CSAC,		CDAC,		CDEI,
 CDFI,		CLNK_CTRL,

 /* Channel specific registers */
 CSSA,		CDSA,		COLOR,
 CCEN,		CCFN,

 /* omap3630 and omap4 specific */
 CDP,		CNDP,		CCDN,

 };

 enum omap_dma_burst_mode {
 	OMAP_DMA_DATA_BURST_DIS = 0,
 	OMAP_DMA_DATA_BURST_4,
 	OMAP_DMA_DATA_BURST_8,
 	OMAP_DMA_DATA_BURST_16,
 };

 enum end_type {
 	OMAP_DMA_LITTLE_ENDIAN = 0,
 	OMAP_DMA_BIG_ENDIAN
 };

 enum omap_dma_color_mode {
 	OMAP_DMA_COLOR_DIS = 0,
 	OMAP_DMA_CONSTANT_FILL,
 	OMAP_DMA_TRANSPARENT_COPY
 };

 enum omap_dma_write_mode {
 	OMAP_DMA_WRITE_NON_POSTED = 0,
 	OMAP_DMA_WRITE_POSTED,
 	OMAP_DMA_WRITE_LAST_NON_POSTED
 };

 enum omap_dma_channel_mode {
 	OMAP_DMA_LCH_2D = 0,
 	OMAP_DMA_LCH_G,
 	OMAP_DMA_LCH_P,
 	OMAP_DMA_LCH_PD
 };

 struct omap_dma_channel_params {
 	int data_type;		/* data type 8,16,32 */
 	int elem_count;		/* number of elements in a frame */
 	int frame_count;	/* number of frames in a element */

 	int src_port;		/* Only on OMAP1 REVISIT: Is this needed? */
 	int src_amode;		/* constant, post increment, indexed,
 					double indexed */
 	unsigned long src_start;	/* source address : physical */
 	int src_ei;		/* source element index */
 	int src_fi;		/* source frame index */

 	int dst_port;		/* Only on OMAP1 REVISIT: Is this needed? */
 	int dst_amode;		/* constant, post increment, indexed,
 					double indexed */
 	unsigned long dst_start;	/* source address : physical */
 	int dst_ei;		/* source element index */
 	int dst_fi;		/* source frame index */

 	int trigger;		/* trigger attached if the channel is
 					synchronized */
 	int sync_mode;		/* sycn on element, frame , block or packet */
 	int src_or_dst_synch;	/* source synch(1) or destination synch(0) */

 	int ie;			/* interrupt enabled */

 	unsigned char read_prio;/* read priority */
 	unsigned char write_prio;/* write priority */

 #ifndef CONFIG_ARCH_OMAP1
 	enum omap_dma_burst_mode burst_mode; /* Burst mode 4/8/16 words */
 #endif
 };

 struct omap_dma_lch {
 	int next_lch;
 	int dev_id;
 	u16 saved_csr;
 	u16 enabled_irqs;
 	const char *dev_name;
 	void (*callback)(int lch, u16 ch_status, void *data);
 	void *data;
 	long flags;
 	/* required for Dynamic chaining */
 	int prev_linked_ch;
 	int next_linked_ch;
 	int state;
 	int chain_id;
 	int status;
 };

 struct omap_dma_dev_attr {
 	u32 dev_caps;
 	u16 lch_count;
 	u16 chan_count;
 	struct omap_dma_lch *chan;
 };

 /* System DMA platform data structure */
 struct omap_system_dma_plat_info {
 	struct omap_dma_dev_attr *dma_attr;
 	u32 errata;
 	void (*disable_irq_lch)(int lch);
 	void (*show_dma_caps)(void);
 	void (*clear_lch_regs)(int lch);
 	void (*clear_dma)(int lch);
 	void (*dma_write)(u32 val, int reg, int lch);
 	u32 (*dma_read)(int reg, int lch);
 };

 #ifdef CONFIG_ARCH_OMAP2PLUS
 #define dma_omap2plus()	1
 #else
 #define dma_omap2plus()	0
 #endif
 #define dma_omap1()	(!dma_omap2plus())
 #define dma_omap15xx()	((dma_omap1() && (d->dev_caps & ENABLE_1510_MODE)))
 #define dma_omap16xx()	((dma_omap1() && (d->dev_caps & ENABLE_16XX_MODE)))

 extern void omap_set_dma_priority(int lch, int dst_port, int priority);
 extern int omap_request_dma(int dev_id, const char *dev_name,
 			void (*callback)(int lch, u16 ch_status, void *data),
 			void *data, int *dma_ch);
 extern void omap_enable_dma_irq(int ch, u16 irq_bits);
 extern void omap_disable_dma_irq(int ch, u16 irq_bits);
 extern void omap_free_dma(int ch);
 extern void omap_start_dma(int lch);
 extern void omap_stop_dma(int lch);
 extern void omap_set_dma_transfer_params(int lch, int data_type,
 					 int elem_count, int frame_count,
 					 int sync_mode,
 					 int dma_trigger, int src_or_dst_synch);
 extern void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode,
 				    u32 color);
 extern void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode);
 extern void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode);

 extern void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 				    unsigned long src_start,
 				    int src_ei, int src_fi);
 extern void omap_set_dma_src_index(int lch, int eidx, int fidx);
 extern void omap_set_dma_src_data_pack(int lch, int enable);
 extern void omap_set_dma_src_burst_mode(int lch,
 					enum omap_dma_burst_mode burst_mode);

 extern void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 				     unsigned long dest_start,
 				     int dst_ei, int dst_fi);
 extern void omap_set_dma_dest_index(int lch, int eidx, int fidx);
 extern void omap_set_dma_dest_data_pack(int lch, int enable);
 extern void omap_set_dma_dest_burst_mode(int lch,
 					 enum omap_dma_burst_mode burst_mode);

 extern void omap_set_dma_params(int lch,
 				struct omap_dma_channel_params *params);

 extern void omap_dma_link_lch(int lch_head, int lch_queue);
 extern void omap_dma_unlink_lch(int lch_head, int lch_queue);

 extern int omap_set_dma_callback(int lch,
 			void (*callback)(int lch, u16 ch_status, void *data),
 			void *data);
 extern dma_addr_t omap_get_dma_src_pos(int lch);
 extern dma_addr_t omap_get_dma_dst_pos(int lch);
 extern void omap_clear_dma(int lch);
 extern int omap_get_dma_active_status(int lch);
 extern int omap_dma_running(void);
 extern void omap_dma_set_global_params(int arb_rate, int max_fifo_depth,
 				       int tparams);
 extern int omap_dma_set_prio_lch(int lch, unsigned char read_prio,
 				 unsigned char write_prio);
 extern void omap_set_dma_dst_endian_type(int lch, enum end_type etype);
 extern void omap_set_dma_src_endian_type(int lch, enum end_type etype);
 extern int omap_get_dma_index(int lch, int *ei, int *fi);

 void omap_dma_global_context_save(void);
 void omap_dma_global_context_restore(void);

 extern void omap_dma_disable_irq(int lch);

 /* Chaining APIs */
 #ifndef CONFIG_ARCH_OMAP1
 extern int omap_request_dma_chain(int dev_id, const char *dev_name,
 				  void (*callback) (int lch, u16 ch_status,
 						    void *data),
 				  int *chain_id, int no_of_chans,
 				  int chain_mode,
 				  struct omap_dma_channel_params params);
 extern int omap_free_dma_chain(int chain_id);
 extern int omap_dma_chain_a_transfer(int chain_id, int src_start,
 				     int dest_start, int elem_count,
 				     int frame_count, void *callbk_data);
 extern int omap_start_dma_chain_transfers(int chain_id);
 extern int omap_stop_dma_chain_transfers(int chain_id);
 extern int omap_get_dma_chain_index(int chain_id, int *ei, int *fi);
 extern int omap_get_dma_chain_dst_pos(int chain_id);
 extern int omap_get_dma_chain_src_pos(int chain_id);

 extern int omap_modify_dma_chain_params(int chain_id,
 					struct omap_dma_channel_params params);
 extern int omap_dma_chain_status(int chain_id);
 #endif

 #if defined(CONFIG_ARCH_OMAP1) && defined(CONFIG_FB_OMAP)
 #include <mach/lcd_dma.h>
 #else
 static inline int omap_lcd_dma_running(void)
 {
 	return 0;
 }
 #endif

 #endif /* __LINUX_OMAP_DMA_H */
	/*
	* OMAP DMA Engine support
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/
	#ifndef __LINUX_OMAP_DMA_H
	#define __LINUX_OMAP_DMA_H

	struct dma_chan;

	#if defined(CONFIG_DMA_OMAP) \|\| defined(CONFIG_DMA_OMAP_MODULE)
	bool omap_dma_filter_fn(struct dma_chan , void );
	#else
	static inline bool omap_dma_filter_fn(struct dma_chan c, void d)
	{
	return false;
	}
	#endif

	/*
	* Legacy OMAP DMA handling defines and functions
	*
	* NOTE: Do not use these any longer.
	*
	* Use the generic dmaengine functions as defined in
	* include/linux/dmaengine.h.
	*
	* Copyright (C) 2003 Nokia Corporation
	* Author: Juha Yrjölä <juha.yrjola@nokia.com>
	*
	*/

	#include <linux/platform_device.h>

	#define INT_DMA_LCD 25

	#define OMAP1_DMA_TOUT_IRQ (1 << 0)
	#define OMAP_DMA_DROP_IRQ (1 << 1)
	#define OMAP_DMA_HALF_IRQ (1 << 2)
	#define OMAP_DMA_FRAME_IRQ (1 << 3)
	#define OMAP_DMA_LAST_IRQ (1 << 4)
	#define OMAP_DMA_BLOCK_IRQ (1 << 5)
	#define OMAP1_DMA_SYNC_IRQ (1 << 6)
	#define OMAP2_DMA_PKT_IRQ (1 << 7)
	#define OMAP2_DMA_TRANS_ERR_IRQ (1 << 8)
	#define OMAP2_DMA_SECURE_ERR_IRQ (1 << 9)
	#define OMAP2_DMA_SUPERVISOR_ERR_IRQ (1 << 10)
	#define OMAP2_DMA_MISALIGNED_ERR_IRQ (1 << 11)

	#define OMAP_DMA_CCR_EN (1 << 7)
	#define OMAP_DMA_CCR_RD_ACTIVE (1 << 9)
	#define OMAP_DMA_CCR_WR_ACTIVE (1 << 10)
	#define OMAP_DMA_CCR_SEL_SRC_DST_SYNC (1 << 24)
	#define OMAP_DMA_CCR_BUFFERING_DISABLE (1 << 25)

	#define OMAP_DMA_DATA_TYPE_S8 0x00
	#define OMAP_DMA_DATA_TYPE_S16 0x01
	#define OMAP_DMA_DATA_TYPE_S32 0x02

	#define OMAP_DMA_SYNC_ELEMENT 0x00
	#define OMAP_DMA_SYNC_FRAME 0x01
	#define OMAP_DMA_SYNC_BLOCK 0x02
	#define OMAP_DMA_SYNC_PACKET 0x03

	#define OMAP_DMA_DST_SYNC_PREFETCH 0x02
	#define OMAP_DMA_SRC_SYNC 0x01
	#define OMAP_DMA_DST_SYNC 0x00

	#define OMAP_DMA_PORT_EMIFF 0x00
	#define OMAP_DMA_PORT_EMIFS 0x01
	#define OMAP_DMA_PORT_OCP_T1 0x02
	#define OMAP_DMA_PORT_TIPB 0x03
	#define OMAP_DMA_PORT_OCP_T2 0x04
	#define OMAP_DMA_PORT_MPUI 0x05

	#define OMAP_DMA_AMODE_CONSTANT 0x00
	#define OMAP_DMA_AMODE_POST_INC 0x01
	#define OMAP_DMA_AMODE_SINGLE_IDX 0x02
	#define OMAP_DMA_AMODE_DOUBLE_IDX 0x03

	#define DMA_DEFAULT_FIFO_DEPTH 0x10
	#define DMA_DEFAULT_ARB_RATE 0x01
	/* Pass THREAD_RESERVE ORed with THREAD_FIFO for tparams */
	#define DMA_THREAD_RESERVE_NORM (0x00 << 12) /* Def */
	#define DMA_THREAD_RESERVE_ONET (0x01 << 12)
	#define DMA_THREAD_RESERVE_TWOT (0x02 << 12)
	#define DMA_THREAD_RESERVE_THREET (0x03 << 12)
	#define DMA_THREAD_FIFO_NONE (0x00 << 14) /* Def */
	#define DMA_THREAD_FIFO_75 (0x01 << 14)
	#define DMA_THREAD_FIFO_25 (0x02 << 14)
	#define DMA_THREAD_FIFO_50 (0x03 << 14)

	/* DMA4_OCP_SYSCONFIG bits */
	#define DMA_SYSCONFIG_MIDLEMODE_MASK (3 << 12)
	#define DMA_SYSCONFIG_CLOCKACTIVITY_MASK (3 << 8)
	#define DMA_SYSCONFIG_EMUFREE (1 << 5)
	#define DMA_SYSCONFIG_SIDLEMODE_MASK (3 << 3)
	#define DMA_SYSCONFIG_SOFTRESET (1 << 2)
	#define DMA_SYSCONFIG_AUTOIDLE (1 << 0)

	#define DMA_SYSCONFIG_MIDLEMODE(n) ((n) << 12)
	#define DMA_SYSCONFIG_SIDLEMODE(n) ((n) << 3)

	#define DMA_IDLEMODE_SMARTIDLE 0x2
	#define DMA_IDLEMODE_NO_IDLE 0x1
	#define DMA_IDLEMODE_FORCE_IDLE 0x0

	/* Chaining modes*/
	#ifndef CONFIG_ARCH_OMAP1
	#define OMAP_DMA_STATIC_CHAIN 0x1
	#define OMAP_DMA_DYNAMIC_CHAIN 0x2
	#define OMAP_DMA_CHAIN_ACTIVE 0x1
	#define OMAP_DMA_CHAIN_INACTIVE 0x0
	#endif

	#define DMA_CH_PRIO_HIGH 0x1
	#define DMA_CH_PRIO_LOW 0x0 /* Def */

	/* Errata handling */
	#define IS_DMA_ERRATA(id) (errata & (id))
	#define SET_DMA_ERRATA(id) (errata \|= (id))

	#define DMA_ERRATA_IFRAME_BUFFERING BIT(0x0)
	#define DMA_ERRATA_PARALLEL_CHANNELS BIT(0x1)
	#define DMA_ERRATA_i378 BIT(0x2)
	#define DMA_ERRATA_i541 BIT(0x3)
	#define DMA_ERRATA_i88 BIT(0x4)
	#define DMA_ERRATA_3_3 BIT(0x5)
	#define DMA_ROMCODE_BUG BIT(0x6)

	/* Attributes for OMAP DMA Contrller */
	#define DMA_LINKED_LCH BIT(0x0)
	#define GLOBAL_PRIORITY BIT(0x1)
	#define RESERVE_CHANNEL BIT(0x2)
	#define IS_CSSA_32 BIT(0x3)
	#define IS_CDSA_32 BIT(0x4)
	#define IS_RW_PRIORITY BIT(0x5)
	#define ENABLE_1510_MODE BIT(0x6)
	#define SRC_PORT BIT(0x7)
	#define DST_PORT BIT(0x8)
	#define SRC_INDEX BIT(0x9)
	#define DST_INDEX BIT(0xa)
	#define IS_BURST_ONLY4 BIT(0xb)
	#define CLEAR_CSR_ON_READ BIT(0xc)
	#define IS_WORD_16 BIT(0xd)
	#define ENABLE_16XX_MODE BIT(0xe)
	#define HS_CHANNELS_RESERVED BIT(0xf)

	/* Defines for DMA Capabilities */
	#define DMA_HAS_TRANSPARENT_CAPS (0x1 << 18)
	#define DMA_HAS_CONSTANT_FILL_CAPS (0x1 << 19)
	#define DMA_HAS_DESCRIPTOR_CAPS (0x3 << 20)

	enum omap_reg_offsets {

	GCR, GSCR, GRST1, HW_ID,
	PCH2_ID, PCH0_ID, PCH1_ID, PCHG_ID,
	PCHD_ID, CAPS_0, CAPS_1, CAPS_2,
	CAPS_3, CAPS_4, PCH2_SR, PCH0_SR,
	PCH1_SR, PCHD_SR, REVISION, IRQSTATUS_L0,
	IRQSTATUS_L1, IRQSTATUS_L2, IRQSTATUS_L3, IRQENABLE_L0,
	IRQENABLE_L1, IRQENABLE_L2, IRQENABLE_L3, SYSSTATUS,
	OCP_SYSCONFIG,

	/* omap1+ specific */
	CPC, CCR2, LCH_CTRL,

	/* Common registers for all omap's */
	CSDP, CCR, CICR, CSR,
	CEN, CFN, CSFI, CSEI,
	CSAC, CDAC, CDEI,
	CDFI, CLNK_CTRL,

	/* Channel specific registers */
	CSSA, CDSA, COLOR,
	CCEN, CCFN,

	/* omap3630 and omap4 specific */
	CDP, CNDP, CCDN,

	};

	enum omap_dma_burst_mode {
	OMAP_DMA_DATA_BURST_DIS = 0,
	OMAP_DMA_DATA_BURST_4,
	OMAP_DMA_DATA_BURST_8,
	OMAP_DMA_DATA_BURST_16,
	};

	enum end_type {
	OMAP_DMA_LITTLE_ENDIAN = 0,
	OMAP_DMA_BIG_ENDIAN
	};

	enum omap_dma_color_mode {
	OMAP_DMA_COLOR_DIS = 0,
	OMAP_DMA_CONSTANT_FILL,
	OMAP_DMA_TRANSPARENT_COPY
	};

	enum omap_dma_write_mode {
	OMAP_DMA_WRITE_NON_POSTED = 0,
	OMAP_DMA_WRITE_POSTED,
	OMAP_DMA_WRITE_LAST_NON_POSTED
	};

	enum omap_dma_channel_mode {
	OMAP_DMA_LCH_2D = 0,
	OMAP_DMA_LCH_G,
	OMAP_DMA_LCH_P,
	OMAP_DMA_LCH_PD
	};

	struct omap_dma_channel_params {
	int data_type; /* data type 8,16,32 */
	int elem_count; /* number of elements in a frame */
	int frame_count; /* number of frames in a element */

	int src_port; /* Only on OMAP1 REVISIT: Is this needed? */
	int src_amode; /* constant, post increment, indexed,
	double indexed */
	unsigned long src_start; /* source address : physical */
	int src_ei; /* source element index */
	int src_fi; /* source frame index */

	int dst_port; /* Only on OMAP1 REVISIT: Is this needed? */
	int dst_amode; /* constant, post increment, indexed,
	double indexed */
	unsigned long dst_start; /* source address : physical */
	int dst_ei; /* source element index */
	int dst_fi; /* source frame index */

	int trigger; /* trigger attached if the channel is
	synchronized */
	int sync_mode; /* sycn on element, frame , block or packet */
	int src_or_dst_synch; /* source synch(1) or destination synch(0) */

	int ie; /* interrupt enabled */

	unsigned char read_prio;/* read priority */
	unsigned char write_prio;/* write priority */

	#ifndef CONFIG_ARCH_OMAP1
	enum omap_dma_burst_mode burst_mode; /* Burst mode 4/8/16 words */
	#endif
	};

	struct omap_dma_lch {
	int next_lch;
	int dev_id;
	u16 saved_csr;
	u16 enabled_irqs;
	const char *dev_name;
	void (callback)(int lch, u16 ch_status, void data);
	void *data;
	long flags;
	/* required for Dynamic chaining */
	int prev_linked_ch;
	int next_linked_ch;
	int state;
	int chain_id;
	int status;
	};

	struct omap_dma_dev_attr {
	u32 dev_caps;
	u16 lch_count;
	u16 chan_count;
	struct omap_dma_lch *chan;
	};

	/* System DMA platform data structure */
	struct omap_system_dma_plat_info {
	struct omap_dma_dev_attr *dma_attr;
	u32 errata;
	void (*disable_irq_lch)(int lch);
	void (*show_dma_caps)(void);
	void (*clear_lch_regs)(int lch);
	void (*clear_dma)(int lch);
	void (*dma_write)(u32 val, int reg, int lch);
	u32 (*dma_read)(int reg, int lch);
	};

	#ifdef CONFIG_ARCH_OMAP2PLUS
	#define dma_omap2plus() 1
	#else
	#define dma_omap2plus() 0
	#endif
	#define dma_omap1() (!dma_omap2plus())
	#define dma_omap15xx() ((dma_omap1() && (d->dev_caps & ENABLE_1510_MODE)))
	#define dma_omap16xx() ((dma_omap1() && (d->dev_caps & ENABLE_16XX_MODE)))

	extern void omap_set_dma_priority(int lch, int dst_port, int priority);
	extern int omap_request_dma(int dev_id, const char *dev_name,
	void (callback)(int lch, u16 ch_status, void data),
	void data, int dma_ch);
	extern void omap_enable_dma_irq(int ch, u16 irq_bits);
	extern void omap_disable_dma_irq(int ch, u16 irq_bits);
	extern void omap_free_dma(int ch);
	extern void omap_start_dma(int lch);
	extern void omap_stop_dma(int lch);
	extern void omap_set_dma_transfer_params(int lch, int data_type,
	int elem_count, int frame_count,
	int sync_mode,
	int dma_trigger, int src_or_dst_synch);
	extern void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode,
	u32 color);
	extern void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode);
	extern void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode);

	extern void omap_set_dma_src_params(int lch, int src_port, int src_amode,
	unsigned long src_start,
	int src_ei, int src_fi);
	extern void omap_set_dma_src_index(int lch, int eidx, int fidx);
	extern void omap_set_dma_src_data_pack(int lch, int enable);
	extern void omap_set_dma_src_burst_mode(int lch,
	enum omap_dma_burst_mode burst_mode);

	extern void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
	unsigned long dest_start,
	int dst_ei, int dst_fi);
	extern void omap_set_dma_dest_index(int lch, int eidx, int fidx);
	extern void omap_set_dma_dest_data_pack(int lch, int enable);
	extern void omap_set_dma_dest_burst_mode(int lch,
	enum omap_dma_burst_mode burst_mode);

	extern void omap_set_dma_params(int lch,
	struct omap_dma_channel_params *params);

	extern void omap_dma_link_lch(int lch_head, int lch_queue);
	extern void omap_dma_unlink_lch(int lch_head, int lch_queue);

	extern int omap_set_dma_callback(int lch,
	void (callback)(int lch, u16 ch_status, void data),
	void *data);
	extern dma_addr_t omap_get_dma_src_pos(int lch);
	extern dma_addr_t omap_get_dma_dst_pos(int lch);
	extern void omap_clear_dma(int lch);
	extern int omap_get_dma_active_status(int lch);
	extern int omap_dma_running(void);
	extern void omap_dma_set_global_params(int arb_rate, int max_fifo_depth,
	int tparams);
	extern int omap_dma_set_prio_lch(int lch, unsigned char read_prio,
	unsigned char write_prio);
	extern void omap_set_dma_dst_endian_type(int lch, enum end_type etype);
	extern void omap_set_dma_src_endian_type(int lch, enum end_type etype);
	extern int omap_get_dma_index(int lch, int ei, int fi);

	void omap_dma_global_context_save(void);
	void omap_dma_global_context_restore(void);

	extern void omap_dma_disable_irq(int lch);

	/* Chaining APIs */
	#ifndef CONFIG_ARCH_OMAP1
	extern int omap_request_dma_chain(int dev_id, const char *dev_name,
	void (*callback) (int lch, u16 ch_status,
	void *data),
	int *chain_id, int no_of_chans,
	int chain_mode,
	struct omap_dma_channel_params params);
	extern int omap_free_dma_chain(int chain_id);
	extern int omap_dma_chain_a_transfer(int chain_id, int src_start,
	int dest_start, int elem_count,
	int frame_count, void *callbk_data);
	extern int omap_start_dma_chain_transfers(int chain_id);
	extern int omap_stop_dma_chain_transfers(int chain_id);
	extern int omap_get_dma_chain_index(int chain_id, int ei, int fi);
	extern int omap_get_dma_chain_dst_pos(int chain_id);
	extern int omap_get_dma_chain_src_pos(int chain_id);

	extern int omap_modify_dma_chain_params(int chain_id,
	struct omap_dma_channel_params params);
	extern int omap_dma_chain_status(int chain_id);
	#endif

	#if defined(CONFIG_ARCH_OMAP1) && defined(CONFIG_FB_OMAP)
	#include <mach/lcd_dma.h>
	#else
	static inline int omap_lcd_dma_running(void)
	{
	return 0;
	}
	#endif

	#endif /* __LINUX_OMAP_DMA_H */