text: /*
   * Copyright (C) 2007, 2008, Marvell International Ltd.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms and conditions of the GNU General Public License,
   * version 2, as published by the Free Software Foundation.
   *
   * This program is distributed in the hope 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.
   */
  
  #ifndef MV_XOR_H
  #define MV_XOR_H
  
  #include <linux/types.h>
  #include <linux/io.h>
  #include <linux/dmaengine.h>
  #include <linux/interrupt.h>
  
  #define MV_XOR_POOL_SIZE		(MV_XOR_SLOT_SIZE * 3072)
  #define MV_XOR_SLOT_SIZE		64
  #define MV_XOR_THRESHOLD		1
  #define MV_XOR_MAX_CHANNELS             2
  
  #define MV_XOR_MIN_BYTE_COUNT		SZ_128
  #define MV_XOR_MAX_BYTE_COUNT		(SZ_16M - 1)
  
  /* Values for the XOR_CONFIG register */
  #define XOR_OPERATION_MODE_XOR		0
  #define XOR_OPERATION_MODE_MEMCPY	2
  #define XOR_OPERATION_MODE_IN_DESC      7
  #define XOR_DESCRIPTOR_SWAP		BIT(14)
  #define XOR_DESC_SUCCESS		0x40000000
  
  #define XOR_DESC_OPERATION_XOR          (0 << 24)
  #define XOR_DESC_OPERATION_CRC32C       (1 << 24)
  #define XOR_DESC_OPERATION_MEMCPY       (2 << 24)
  
  #define XOR_DESC_DMA_OWNED		BIT(31)
  #define XOR_DESC_EOD_INT_EN		BIT(31)
  
  #define XOR_CURR_DESC(chan)	(chan->mmr_high_base + 0x10 + (chan->idx * 4))
  #define XOR_NEXT_DESC(chan)	(chan->mmr_high_base + 0x00 + (chan->idx * 4))
  #define XOR_BYTE_COUNT(chan)	(chan->mmr_high_base + 0x20 + (chan->idx * 4))
  #define XOR_DEST_POINTER(chan)	(chan->mmr_high_base + 0xB0 + (chan->idx * 4))
  #define XOR_BLOCK_SIZE(chan)	(chan->mmr_high_base + 0xC0 + (chan->idx * 4))
  #define XOR_INIT_VALUE_LOW(chan)	(chan->mmr_high_base + 0xE0)
  #define XOR_INIT_VALUE_HIGH(chan)	(chan->mmr_high_base + 0xE4)
  
  #define XOR_CONFIG(chan)	(chan->mmr_base + 0x10 + (chan->idx * 4))
  #define XOR_ACTIVATION(chan)	(chan->mmr_base + 0x20 + (chan->idx * 4))
  #define XOR_INTR_CAUSE(chan)	(chan->mmr_base + 0x30)
  #define XOR_INTR_MASK(chan)	(chan->mmr_base + 0x40)
  #define XOR_ERROR_CAUSE(chan)	(chan->mmr_base + 0x50)
  #define XOR_ERROR_ADDR(chan)	(chan->mmr_base + 0x60)
  
  #define XOR_INT_END_OF_DESC	BIT(0)
  #define XOR_INT_END_OF_CHAIN	BIT(1)
  #define XOR_INT_STOPPED		BIT(2)
  #define XOR_INT_PAUSED		BIT(3)
  #define XOR_INT_ERR_DECODE	BIT(4)
  #define XOR_INT_ERR_RDPROT	BIT(5)
  #define XOR_INT_ERR_WRPROT	BIT(6)
  #define XOR_INT_ERR_OWN		BIT(7)
  #define XOR_INT_ERR_PAR		BIT(8)
  #define XOR_INT_ERR_MBUS	BIT(9)
  
  #define XOR_INTR_ERRORS		(XOR_INT_ERR_DECODE | XOR_INT_ERR_RDPROT | \
  				 XOR_INT_ERR_WRPROT | XOR_INT_ERR_OWN    | \
  				 XOR_INT_ERR_PAR    | XOR_INT_ERR_MBUS)
  
  #define XOR_INTR_MASK_VALUE	(XOR_INT_END_OF_DESC | XOR_INT_END_OF_CHAIN | \
  				 XOR_INT_STOPPED     | XOR_INTR_ERRORS)
  
  #define WINDOW_BASE(w)		(0x50 + ((w) << 2))
  #define WINDOW_SIZE(w)		(0x70 + ((w) << 2))
  #define WINDOW_REMAP_HIGH(w)	(0x90 + ((w) << 2))
  #define WINDOW_BAR_ENABLE(chan)	(0x40 + ((chan) << 2))
  #define WINDOW_OVERRIDE_CTRL(chan)	(0xA0 + ((chan) << 2))
  
  struct mv_xor_device {
  	void __iomem	     *xor_base;
  	void __iomem	     *xor_high_base;
  	struct clk	     *clk;
  	struct mv_xor_chan   *channels[MV_XOR_MAX_CHANNELS];
  };
  
  /**
   * struct mv_xor_chan - internal representation of a XOR channel
   * @pending: allows batching of hardware operations
   * @lock: serializes enqueue/dequeue operations to the descriptors pool
   * @mmr_base: memory mapped register base
   * @idx: the index of the xor channel
   * @chain: device chain view of the descriptors
   * @free_slots: free slots usable by the channel
   * @allocated_slots: slots allocated by the driver
   * @completed_slots: slots completed by HW but still need to be acked
   * @device: parent device
   * @common: common dmaengine channel object members
   * @slots_allocated: records the actual size of the descriptor slot pool
   * @irq_tasklet: bottom half where mv_xor_slot_cleanup runs
   * @op_in_desc: new mode of driver, each op is writen to descriptor.
   */
  struct mv_xor_chan {
  	int			pending;
  	spinlock_t		lock; /* protects the descriptor slot pool */
  	void __iomem		*mmr_base;
  	void __iomem		*mmr_high_base;
  	unsigned int		idx;
  	int                     irq;
  	enum dma_transaction_type	current_type;
  	struct list_head	chain;
  	struct list_head	free_slots;
  	struct list_head	allocated_slots;
  	struct list_head	completed_slots;
  	dma_addr_t		dma_desc_pool;
  	void			*dma_desc_pool_virt;
  	size_t                  pool_size;
  	struct dma_device	dmadev;
  	struct dma_chan		dmachan;
  	int			slots_allocated;
  	struct tasklet_struct	irq_tasklet;
  	int                     op_in_desc;
  	char			dummy_src[MV_XOR_MIN_BYTE_COUNT];
  	char			dummy_dst[MV_XOR_MIN_BYTE_COUNT];
  	dma_addr_t		dummy_src_addr, dummy_dst_addr;
  };
  
  /**
   * struct mv_xor_desc_slot - software descriptor
   * @node: node on the mv_xor_chan lists
   * @hw_desc: virtual address of the hardware descriptor chain
   * @phys: hardware address of the hardware descriptor chain
   * @slot_used: slot in use or not
   * @idx: pool index
   * @tx_list: list of slots that make up a multi-descriptor transaction
   * @async_tx: support for the async_tx api
   */
  struct mv_xor_desc_slot {
  	struct list_head	node;
  	enum dma_transaction_type	type;
  	void			*hw_desc;
  	u16			idx;
  	struct dma_async_tx_descriptor	async_tx;
  };
  
  /*
   * This structure describes XOR descriptor size 64bytes. The
   * mv_phy_src_idx() macro must be used when indexing the values of the
   * phy_src_addr[] array. This is due to the fact that the 'descriptor
   * swap' feature, used on big endian systems, swaps descriptors data
   * within blocks of 8 bytes. So two consecutive values of the
   * phy_src_addr[] array are actually swapped in big-endian, which
   * explains the different mv_phy_src_idx() implementation.
   */
  #if defined(__LITTLE_ENDIAN)
  struct mv_xor_desc {
  	u32 status;		/* descriptor execution status */
  	u32 crc32_result;	/* result of CRC-32 calculation */
  	u32 desc_command;	/* type of operation to be carried out */
  	u32 phy_next_desc;	/* next descriptor address pointer */
  	u32 byte_count;		/* size of src/dst blocks in bytes */
  	u32 phy_dest_addr;	/* destination block address */
  	u32 phy_src_addr[8];	/* source block addresses */
  	u32 reserved0;
  	u32 reserved1;
  };
  #define mv_phy_src_idx(src_idx) (src_idx)
  #else
  struct mv_xor_desc {
  	u32 crc32_result;	/* result of CRC-32 calculation */
  	u32 status;		/* descriptor execution status */
  	u32 phy_next_desc;	/* next descriptor address pointer */
  	u32 desc_command;	/* type of operation to be carried out */
  	u32 phy_dest_addr;	/* destination block address */
  	u32 byte_count;		/* size of src/dst blocks in bytes */
  	u32 phy_src_addr[8];	/* source block addresses */
  	u32 reserved1;
  	u32 reserved0;
  };
  #define mv_phy_src_idx(src_idx) (src_idx ^ 1)
  #endif
  
  #define to_mv_sw_desc(addr_hw_desc)		\
  	container_of(addr_hw_desc, struct mv_xor_desc_slot, hw_desc)
  
  #define mv_hw_desc_slot_idx(hw_desc, idx)	\
  	((void *)(((unsigned long)hw_desc) + ((idx) << 5)))
  
  #endif
  