include/linux/platform_data/dma-ste-dma40.h - kernel/bruno - Git at Google

 /*
  * Copyright (C) ST-Ericsson SA 2007-2010
  * Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson
  * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
  * License terms: GNU General Public License (GPL) version 2
  */


 #ifndef STE_DMA40_H
 #define STE_DMA40_H

 #include <linux/dmaengine.h>
 #include <linux/scatterlist.h>
 #include <linux/workqueue.h>
 #include <linux/interrupt.h>

 /*
  * Maxium size for a single dma descriptor
  * Size is limited to 16 bits.
  * Size is in the units of addr-widths (1,2,4,8 bytes)
  * Larger transfers will be split up to multiple linked desc
  */
 #define STEDMA40_MAX_SEG_SIZE 0xFFFF

 /* dev types for memcpy */
 #define STEDMA40_DEV_DST_MEMORY (-1)
 #define	STEDMA40_DEV_SRC_MEMORY (-1)

 enum stedma40_mode {
 	STEDMA40_MODE_LOGICAL = 0,
 	STEDMA40_MODE_PHYSICAL,
 	STEDMA40_MODE_OPERATION,
 };

 enum stedma40_mode_opt {
 	STEDMA40_PCHAN_BASIC_MODE = 0,
 	STEDMA40_LCHAN_SRC_LOG_DST_LOG = 0,
 	STEDMA40_PCHAN_MODULO_MODE,
 	STEDMA40_PCHAN_DOUBLE_DST_MODE,
 	STEDMA40_LCHAN_SRC_PHY_DST_LOG,
 	STEDMA40_LCHAN_SRC_LOG_DST_PHY,
 };

 #define STEDMA40_ESIZE_8_BIT  0x0
 #define STEDMA40_ESIZE_16_BIT 0x1
 #define STEDMA40_ESIZE_32_BIT 0x2
 #define STEDMA40_ESIZE_64_BIT 0x3

 /* The value 4 indicates that PEN-reg shall be set to 0 */
 #define STEDMA40_PSIZE_PHY_1  0x4
 #define STEDMA40_PSIZE_PHY_2  0x0
 #define STEDMA40_PSIZE_PHY_4  0x1
 #define STEDMA40_PSIZE_PHY_8  0x2
 #define STEDMA40_PSIZE_PHY_16 0x3

 /*
  * The number of elements differ in logical and
  * physical mode
  */
 #define STEDMA40_PSIZE_LOG_1  STEDMA40_PSIZE_PHY_2
 #define STEDMA40_PSIZE_LOG_4  STEDMA40_PSIZE_PHY_4
 #define STEDMA40_PSIZE_LOG_8  STEDMA40_PSIZE_PHY_8
 #define STEDMA40_PSIZE_LOG_16 STEDMA40_PSIZE_PHY_16

 /* Maximum number of possible physical channels */
 #define STEDMA40_MAX_PHYS 32

 enum stedma40_flow_ctrl {
 	STEDMA40_NO_FLOW_CTRL,
 	STEDMA40_FLOW_CTRL,
 };

 /**
  * struct stedma40_half_channel_info - dst/src channel configuration
  *
  * @big_endian: true if the src/dst should be read as big endian
  * @data_width: Data width of the src/dst hardware
  * @p_size: Burst size
  * @flow_ctrl: Flow control on/off.
  */
 struct stedma40_half_channel_info {
 	bool big_endian;
 	enum dma_slave_buswidth data_width;
 	int psize;
 	enum stedma40_flow_ctrl flow_ctrl;
 };

 /**
  * struct stedma40_chan_cfg - Structure to be filled by client drivers.
  *
  * @dir: MEM 2 MEM, PERIPH 2 MEM , MEM 2 PERIPH, PERIPH 2 PERIPH
  * @high_priority: true if high-priority
  * @realtime: true if realtime mode is to be enabled.  Only available on DMA40
  * version 3+, i.e DB8500v2+
  * @mode: channel mode: physical, logical, or operation
  * @mode_opt: options for the chosen channel mode
  * @dev_type: src/dst device type (driver uses dir to figure out which)
  * @src_info: Parameters for dst half channel
  * @dst_info: Parameters for dst half channel
  * @use_fixed_channel: if true, use physical channel specified by phy_channel
  * @phy_channel: physical channel to use, only if use_fixed_channel is true
  *
  * This structure has to be filled by the client drivers.
  * It is recommended to do all dma configurations for clients in the machine.
  *
  */
 struct stedma40_chan_cfg {
 	enum dma_transfer_direction		 dir;
 	bool					 high_priority;
 	bool					 realtime;
 	enum stedma40_mode			 mode;
 	enum stedma40_mode_opt			 mode_opt;
 	int					 dev_type;
 	struct stedma40_half_channel_info	 src_info;
 	struct stedma40_half_channel_info	 dst_info;

 	bool					 use_fixed_channel;
 	int					 phy_channel;
 };

 /**
  * struct stedma40_platform_data - Configuration struct for the dma device.
  *
  * @dev_tx: mapping between destination event line and io address
  * @dev_rx: mapping between source event line and io address
  * @disabled_channels: A vector, ending with -1, that marks physical channels
  * that are for different reasons not available for the driver.
  * @soft_lli_chans: A vector, that marks physical channels will use LLI by SW
  * which avoids HW bug that exists in some versions of the controller.
  * SoftLLI introduces relink overhead that could impact performace for
  * certain use cases.
  * @num_of_soft_lli_chans: The number of channels that needs to be configured
  * to use SoftLLI.
  * @use_esram_lcla: flag for mapping the lcla into esram region
  * @num_of_memcpy_chans: The number of channels reserved for memcpy.
  * @num_of_phy_chans: The number of physical channels implemented in HW.
  * 0 means reading the number of channels from DMA HW but this is only valid
  * for 'multiple of 4' channels, like 8.
  */
 struct stedma40_platform_data {
 	int				 disabled_channels[STEDMA40_MAX_PHYS];
 	int				*soft_lli_chans;
 	int				 num_of_soft_lli_chans;
 	bool				 use_esram_lcla;
 	int				 num_of_memcpy_chans;
 	int				 num_of_phy_chans;
 };

 #ifdef CONFIG_STE_DMA40

 /**
  * stedma40_filter() - Provides stedma40_chan_cfg to the
  * ste_dma40 dma driver via the dmaengine framework.
  * does some checking of what's provided.
  *
  * Never directly called by client. It used by dmaengine.
  * @chan: dmaengine handle.
  * @data: Must be of type: struct stedma40_chan_cfg and is
  * the configuration of the framework.
  *
  *
  */

 bool stedma40_filter(struct dma_chan *chan, void *data);

 /**
  * stedma40_slave_mem() - Transfers a raw data buffer to or from a slave
  * (=device)
  *
  * @chan: dmaengine handle
  * @addr: source or destination physicall address.
  * @size: bytes to transfer
  * @direction: direction of transfer
  * @flags: is actually enum dma_ctrl_flags. See dmaengine.h
  */

 static inline struct
 dma_async_tx_descriptor *stedma40_slave_mem(struct dma_chan *chan,
 					    dma_addr_t addr,
 					    unsigned int size,
 					    enum dma_transfer_direction direction,
 					    unsigned long flags)
 {
 	struct scatterlist sg;
 	sg_init_table(&sg, 1);
 	sg.dma_address = addr;
 	sg.length = size;

 	return dmaengine_prep_slave_sg(chan, &sg, 1, direction, flags);
 }

 #else
 static inline bool stedma40_filter(struct dma_chan *chan, void *data)
 {
 	return false;
 }

 static inline struct
 dma_async_tx_descriptor *stedma40_slave_mem(struct dma_chan *chan,
 					    dma_addr_t addr,
 					    unsigned int size,
 					    enum dma_transfer_direction direction,
 					    unsigned long flags)
 {
 	return NULL;
 }
 #endif

 #endif
	/*
	* Copyright (C) ST-Ericsson SA 2007-2010
	* Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson
	* Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
	* License terms: GNU General Public License (GPL) version 2
	*/


	#ifndef STE_DMA40_H
	#define STE_DMA40_H

	#include <linux/dmaengine.h>
	#include <linux/scatterlist.h>
	#include <linux/workqueue.h>
	#include <linux/interrupt.h>

	/*
	* Maxium size for a single dma descriptor
	* Size is limited to 16 bits.
	* Size is in the units of addr-widths (1,2,4,8 bytes)
	* Larger transfers will be split up to multiple linked desc
	*/
	#define STEDMA40_MAX_SEG_SIZE 0xFFFF

	/* dev types for memcpy */
	#define STEDMA40_DEV_DST_MEMORY (-1)
	#define STEDMA40_DEV_SRC_MEMORY (-1)

	enum stedma40_mode {
	STEDMA40_MODE_LOGICAL = 0,
	STEDMA40_MODE_PHYSICAL,
	STEDMA40_MODE_OPERATION,
	};

	enum stedma40_mode_opt {
	STEDMA40_PCHAN_BASIC_MODE = 0,
	STEDMA40_LCHAN_SRC_LOG_DST_LOG = 0,
	STEDMA40_PCHAN_MODULO_MODE,
	STEDMA40_PCHAN_DOUBLE_DST_MODE,
	STEDMA40_LCHAN_SRC_PHY_DST_LOG,
	STEDMA40_LCHAN_SRC_LOG_DST_PHY,
	};

	#define STEDMA40_ESIZE_8_BIT 0x0
	#define STEDMA40_ESIZE_16_BIT 0x1
	#define STEDMA40_ESIZE_32_BIT 0x2
	#define STEDMA40_ESIZE_64_BIT 0x3

	/* The value 4 indicates that PEN-reg shall be set to 0 */
	#define STEDMA40_PSIZE_PHY_1 0x4
	#define STEDMA40_PSIZE_PHY_2 0x0
	#define STEDMA40_PSIZE_PHY_4 0x1
	#define STEDMA40_PSIZE_PHY_8 0x2
	#define STEDMA40_PSIZE_PHY_16 0x3

	/*
	* The number of elements differ in logical and
	* physical mode
	*/
	#define STEDMA40_PSIZE_LOG_1 STEDMA40_PSIZE_PHY_2
	#define STEDMA40_PSIZE_LOG_4 STEDMA40_PSIZE_PHY_4
	#define STEDMA40_PSIZE_LOG_8 STEDMA40_PSIZE_PHY_8
	#define STEDMA40_PSIZE_LOG_16 STEDMA40_PSIZE_PHY_16

	/* Maximum number of possible physical channels */
	#define STEDMA40_MAX_PHYS 32

	enum stedma40_flow_ctrl {
	STEDMA40_NO_FLOW_CTRL,
	STEDMA40_FLOW_CTRL,
	};

	/**
	* struct stedma40_half_channel_info - dst/src channel configuration
	*
	* @big_endian: true if the src/dst should be read as big endian
	* @data_width: Data width of the src/dst hardware
	* @p_size: Burst size
	* @flow_ctrl: Flow control on/off.
	*/
	struct stedma40_half_channel_info {
	bool big_endian;
	enum dma_slave_buswidth data_width;
	int psize;
	enum stedma40_flow_ctrl flow_ctrl;
	};

	/**
	* struct stedma40_chan_cfg - Structure to be filled by client drivers.
	*
	* @dir: MEM 2 MEM, PERIPH 2 MEM , MEM 2 PERIPH, PERIPH 2 PERIPH
	* @high_priority: true if high-priority
	* @realtime: true if realtime mode is to be enabled. Only available on DMA40
	* version 3+, i.e DB8500v2+
	* @mode: channel mode: physical, logical, or operation
	* @mode_opt: options for the chosen channel mode
	* @dev_type: src/dst device type (driver uses dir to figure out which)
	* @src_info: Parameters for dst half channel
	* @dst_info: Parameters for dst half channel
	* @use_fixed_channel: if true, use physical channel specified by phy_channel
	* @phy_channel: physical channel to use, only if use_fixed_channel is true
	*
	* This structure has to be filled by the client drivers.
	* It is recommended to do all dma configurations for clients in the machine.
	*
	*/
	struct stedma40_chan_cfg {
	enum dma_transfer_direction dir;
	bool high_priority;
	bool realtime;
	enum stedma40_mode mode;
	enum stedma40_mode_opt mode_opt;
	int dev_type;
	struct stedma40_half_channel_info src_info;
	struct stedma40_half_channel_info dst_info;

	bool use_fixed_channel;
	int phy_channel;
	};

	/**
	* struct stedma40_platform_data - Configuration struct for the dma device.
	*
	* @dev_tx: mapping between destination event line and io address
	* @dev_rx: mapping between source event line and io address
	* @disabled_channels: A vector, ending with -1, that marks physical channels
	* that are for different reasons not available for the driver.
	* @soft_lli_chans: A vector, that marks physical channels will use LLI by SW
	* which avoids HW bug that exists in some versions of the controller.
	* SoftLLI introduces relink overhead that could impact performace for
	* certain use cases.
	* @num_of_soft_lli_chans: The number of channels that needs to be configured
	* to use SoftLLI.
	* @use_esram_lcla: flag for mapping the lcla into esram region
	* @num_of_memcpy_chans: The number of channels reserved for memcpy.
	* @num_of_phy_chans: The number of physical channels implemented in HW.
	* 0 means reading the number of channels from DMA HW but this is only valid
	* for 'multiple of 4' channels, like 8.
	*/
	struct stedma40_platform_data {
	int disabled_channels[STEDMA40_MAX_PHYS];
	int *soft_lli_chans;
	int num_of_soft_lli_chans;
	bool use_esram_lcla;
	int num_of_memcpy_chans;
	int num_of_phy_chans;
	};

	#ifdef CONFIG_STE_DMA40

	/**
	* stedma40_filter() - Provides stedma40_chan_cfg to the
	* ste_dma40 dma driver via the dmaengine framework.
	* does some checking of what's provided.
	*
	* Never directly called by client. It used by dmaengine.
	* @chan: dmaengine handle.
	* @data: Must be of type: struct stedma40_chan_cfg and is
	* the configuration of the framework.
	*
	*
	*/

	bool stedma40_filter(struct dma_chan chan, void data);

	/**
	* stedma40_slave_mem() - Transfers a raw data buffer to or from a slave
	* (=device)
	*
	* @chan: dmaengine handle
	* @addr: source or destination physicall address.
	* @size: bytes to transfer
	* @direction: direction of transfer
	* @flags: is actually enum dma_ctrl_flags. See dmaengine.h
	*/

	static inline struct
	dma_async_tx_descriptor stedma40_slave_mem(struct dma_chan chan,
	dma_addr_t addr,
	unsigned int size,
	enum dma_transfer_direction direction,
	unsigned long flags)
	{
	struct scatterlist sg;
	sg_init_table(&sg, 1);
	sg.dma_address = addr;
	sg.length = size;

	return dmaengine_prep_slave_sg(chan, &sg, 1, direction, flags);
	}

	#else
	static inline bool stedma40_filter(struct dma_chan chan, void data)
	{
	return false;
	}

	static inline struct
	dma_async_tx_descriptor stedma40_slave_mem(struct dma_chan chan,
	dma_addr_t addr,
	unsigned int size,
	enum dma_transfer_direction direction,
	unsigned long flags)
	{
	return NULL;
	}
	#endif

	#endif