diff options
Diffstat (limited to 'drivers/dma/mv_xor.h')
| -rw-r--r-- | drivers/dma/mv_xor.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h new file mode 100644 index 000000000..0e302b3a3 --- /dev/null +++ b/drivers/dma/mv_xor.h @@ -0,0 +1,190 @@ +/* + * 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 PAGE_SIZE +#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_DESCRIPTOR_SWAP BIT(14) +#define XOR_DESC_SUCCESS 0x40000000 + +#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 + * @completed_slots: slots completed by HW but still need to be acked + * @device: parent device + * @common: common dmaengine channel object members + * @last_used: place holder for allocation to continue from where it left off + * @all_slots: complete domain of slots usable by the channel + * @slots_allocated: records the actual size of the descriptor slot pool + * @irq_tasklet: bottom half where mv_xor_slot_cleanup runs + */ +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 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; + struct mv_xor_desc_slot *last_used; + struct list_head all_slots; + int slots_allocated; + struct tasklet_struct irq_tasklet; + 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 + * @slot_node: node on the mv_xor_chan.all_slots list + * @chain_node: node on the mv_xor_chan.chain list + * @completed_node: node on the mv_xor_chan.completed_slots list + * @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 slot_node; + struct list_head chain_node; + struct list_head completed_node; + enum dma_transaction_type type; + void *hw_desc; + u16 slot_used; + 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 |