- 根目录:
- drivers
- dma
- ppc4xx
- adma.h
/*
* 2006-2009 (C) DENX Software Engineering.
*
* Author: Yuri Tikhonov <yur@emcraft.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of
* any kind, whether express or implied.
*/
#ifndef _PPC440SPE_ADMA_H
#define _PPC440SPE_ADMA_H
#include <linux/types.h>
#include "dma.h"
#include "xor.h"
#define to_ppc440spe_adma_chan(chan) \
container_of(chan, struct ppc440spe_adma_chan, common)
#define to_ppc440spe_adma_device(dev) \
container_of(dev, struct ppc440spe_adma_device, common)
#define tx_to_ppc440spe_adma_slot(tx) \
container_of(tx, struct ppc440spe_adma_desc_slot, async_tx)
/* Default polynomial (for 440SP is only available) */
#define PPC440SPE_DEFAULT_POLY 0x4d
#define PPC440SPE_ADMA_ENGINES_NUM (XOR_ENGINES_NUM + DMA_ENGINES_NUM)
#define PPC440SPE_ADMA_WATCHDOG_MSEC 3
#define PPC440SPE_ADMA_THRESHOLD 1
#define PPC440SPE_DMA0_ID 0
#define PPC440SPE_DMA1_ID 1
#define PPC440SPE_XOR_ID 2
#define PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT 0xFFFFFFUL
/* this is the XOR_CBBCR width */
#define PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT (1 << 31)
#define PPC440SPE_ADMA_ZERO_SUM_MAX_BYTE_COUNT PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT
#define PPC440SPE_RXOR_RUN 0
#define MQ0_CF2H_RXOR_BS_MASK 0x1FF
#undef ADMA_LL_DEBUG
/**
* struct ppc440spe_adma_device - internal representation of an ADMA device
* @dev: device
* @dma_reg: base for DMAx register access
* @xor_reg: base for XOR register access
* @i2o_reg: base for I2O register access
* @id: HW ADMA Device selector
* @dma_desc_pool_virt: base of DMA descriptor region (CPU address)
* @dma_desc_pool: base of DMA descriptor region (DMA address)
* @pool_size: size of the pool
* @irq: DMAx or XOR irq number
* @err_irq: DMAx error irq number
* @common: embedded struct dma_device
*/
struct ppc440spe_adma_device {
struct device *dev;
struct dma_regs __iomem *dma_reg;
struct xor_regs __iomem *xor_reg;
struct i2o_regs __iomem *i2o_reg;
int id;
void *dma_desc_pool_virt;
dma_addr_t dma_desc_pool;
size_t pool_size;
int irq;
int err_irq;
struct dma_device common;
};
/**
* struct ppc440spe_adma_chan - internal representation of an ADMA channel
* @lock: serializes enqueue/dequeue operations to the slot pool
* @device: parent device
* @chain: device chain view of the descriptors
* @common: common dmaengine channel object members
* @all_slots: complete domain of slots usable by the channel
* @pending: allows batching of hardware operations
* @slots_allocated: records the actual size of the descriptor slot pool
* @hw_chain_inited: h/w descriptor chain initialization flag
* @irq_tasklet: bottom half where ppc440spe_adma_slot_cleanup runs
* @needs_unmap: if buffers should not be unmapped upon final processing
* @pdest_page: P destination page for async validate operation
* @qdest_page: Q destination page for async validate operation
* @pdest: P dma addr for async validate operation
* @qdest: Q dma addr for async validate operation
*/
struct ppc440spe_adma_chan {
spinlock_t lock;
struct ppc440spe_adma_device *device;
struct list_head chain;
struct dma_chan common;
struct list_head all_slots;
struct ppc440spe_adma_desc_slot *last_used;
int pending;
int slots_allocated;
int hw_chain_inited;
struct tasklet_struct irq_tasklet;
u8 needs_unmap;
struct page *pdest_page;
struct page *qdest_page;
dma_addr_t pdest;
dma_addr_t qdest;
};
struct ppc440spe_rxor {
u32 addrl;
u32 addrh;
int len;
int xor_count;
int addr_count;
int desc_count;
int state;
};
/**
* struct ppc440spe_adma_desc_slot - PPC440SPE-ADMA software descriptor
* @phys: hardware address of the hardware descriptor chain
* @group_head: first operation in a transaction
* @hw_next: pointer to the next descriptor in chain
* @async_tx: support for the async_tx api
* @slot_node: node on the iop_adma_chan.all_slots list
* @chain_node: node on the op_adma_chan.chain list
* @group_list: list of slots that make up a multi-descriptor transaction
* for example transfer lengths larger than the supported hw max
* @unmap_len: transaction bytecount
* @hw_desc: virtual address of the hardware descriptor chain
* @stride: currently chained or not
* @idx: pool index
* @slot_cnt: total slots used in an transaction (group of operations)
* @src_cnt: number of sources set in this descriptor
* @dst_cnt: number of destinations set in the descriptor
* @slots_per_op: number of slots per operation
* @descs_per_op: number of slot per P/Q operation see comment
* for ppc440spe_prep_dma_pqxor function
* @flags: desc state/type
* @reverse_flags: 1 if a corresponding rxor address uses reversed address order
* @xor_check_result: result of zero sum
* @crc32_result: result crc calculation
*/
struct ppc440spe_adma_desc_slot {
dma_addr_t phys;
struct ppc440spe_adma_desc_slot *group_head;
struct ppc440spe_adma_desc_slot *hw_next;
struct dma_async_tx_descriptor async_tx;
struct list_head slot_node;
struct list_head chain_node; /* node in channel ops list */
struct list_head group_list; /* list */
unsigned int unmap_len;
void *hw_desc;
u16 stride;
u16 idx;
u16 slot_cnt;
u8 src_cnt;
u8 dst_cnt;
u8 slots_per_op;
u8 descs_per_op;
unsigned long flags;
unsigned long reverse_flags[8];
#define PPC440SPE_DESC_INT 0 /* generate interrupt on complete */
#define PPC440SPE_ZERO_P 1 /* clear P destionaion */
#define PPC440SPE_ZERO_Q 2 /* clear Q destination */
#define PPC440SPE_COHERENT 3 /* src/dst are coherent */
#define PPC440SPE_DESC_WXOR 4 /* WXORs are in chain */
#define PPC440SPE_DESC_RXOR 5 /* RXOR is in chain */
#define PPC440SPE_DESC_RXOR123 8 /* CDB for RXOR123 operation */
#define PPC440SPE_DESC_RXOR124 9 /* CDB for RXOR124 operation */
#define PPC440SPE_DESC_RXOR125 10 /* CDB for RXOR125 operation */
#define PPC440SPE_DESC_RXOR12 11 /* CDB for RXOR12 operation */
#define PPC440SPE_DESC_RXOR_REV 12 /* CDB has srcs in reversed order */
#define PPC440SPE_DESC_PCHECK 13
#define PPC440SPE_DESC_QCHECK 14
#define PPC440SPE_DESC_RXOR_MSK 0x3
struct ppc440spe_rxor rxor_cursor;
union {
u32 *xor_check_result;
u32 *crc32_result;
};
};
#endif /* _PPC440SPE_ADMA_H */