2 * Copyright (C) 2007, 2008, Marvell International Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
21 #include <linux/types.h>
23 #include <linux/dmaengine.h>
24 #include <linux/interrupt.h>
27 #define MV_XOR_POOL_SIZE PAGE_SIZE
28 #define MV_XOR_SLOT_SIZE 64
29 #define MV_XOR_THRESHOLD 1
30 #define MV_XOR_MAX_CHANNELS 2
32 /* Values for the XOR_CONFIG register */
33 #define XOR_OPERATION_MODE_XOR 0
34 #define XOR_OPERATION_MODE_MEMCPY 2
35 #define XOR_DESCRIPTOR_SWAP BIT(14)
37 #define XOR_CURR_DESC(chan) (chan->mmr_base + 0x210 + (chan->idx * 4))
38 #define XOR_NEXT_DESC(chan) (chan->mmr_base + 0x200 + (chan->idx * 4))
39 #define XOR_BYTE_COUNT(chan) (chan->mmr_base + 0x220 + (chan->idx * 4))
40 #define XOR_DEST_POINTER(chan) (chan->mmr_base + 0x2B0 + (chan->idx * 4))
41 #define XOR_BLOCK_SIZE(chan) (chan->mmr_base + 0x2C0 + (chan->idx * 4))
42 #define XOR_INIT_VALUE_LOW(chan) (chan->mmr_base + 0x2E0)
43 #define XOR_INIT_VALUE_HIGH(chan) (chan->mmr_base + 0x2E4)
45 #define XOR_CONFIG(chan) (chan->mmr_base + 0x10 + (chan->idx * 4))
46 #define XOR_ACTIVATION(chan) (chan->mmr_base + 0x20 + (chan->idx * 4))
47 #define XOR_INTR_CAUSE(chan) (chan->mmr_base + 0x30)
48 #define XOR_INTR_MASK(chan) (chan->mmr_base + 0x40)
49 #define XOR_ERROR_CAUSE(chan) (chan->mmr_base + 0x50)
50 #define XOR_ERROR_ADDR(chan) (chan->mmr_base + 0x60)
51 #define XOR_INTR_MASK_VALUE 0x3F5
53 #define WINDOW_BASE(w) (0x250 + ((w) << 2))
54 #define WINDOW_SIZE(w) (0x270 + ((w) << 2))
55 #define WINDOW_REMAP_HIGH(w) (0x290 + ((w) << 2))
56 #define WINDOW_BAR_ENABLE(chan) (0x240 + ((chan) << 2))
57 #define WINDOW_OVERRIDE_CTRL(chan) (0x2A0 + ((chan) << 2))
59 struct mv_xor_device {
60 void __iomem *xor_base;
61 void __iomem *xor_high_base;
63 struct mv_xor_chan *channels[MV_XOR_MAX_CHANNELS];
67 * struct mv_xor_chan - internal representation of a XOR channel
68 * @pending: allows batching of hardware operations
69 * @lock: serializes enqueue/dequeue operations to the descriptors pool
70 * @mmr_base: memory mapped register base
71 * @idx: the index of the xor channel
72 * @chain: device chain view of the descriptors
73 * @completed_slots: slots completed by HW but still need to be acked
74 * @device: parent device
75 * @common: common dmaengine channel object members
76 * @last_used: place holder for allocation to continue from where it left off
77 * @all_slots: complete domain of slots usable by the channel
78 * @slots_allocated: records the actual size of the descriptor slot pool
79 * @irq_tasklet: bottom half where mv_xor_slot_cleanup runs
83 spinlock_t lock; /* protects the descriptor slot pool */
84 void __iomem *mmr_base;
87 enum dma_transaction_type current_type;
88 struct list_head chain;
89 struct list_head completed_slots;
90 dma_addr_t dma_desc_pool;
91 void *dma_desc_pool_virt;
93 struct dma_device dmadev;
94 struct dma_chan dmachan;
95 struct mv_xor_desc_slot *last_used;
96 struct list_head all_slots;
98 struct tasklet_struct irq_tasklet;
100 unsigned long cleanup_time;
101 u32 current_on_last_cleanup;
106 * struct mv_xor_desc_slot - software descriptor
107 * @slot_node: node on the mv_xor_chan.all_slots list
108 * @chain_node: node on the mv_xor_chan.chain list
109 * @completed_node: node on the mv_xor_chan.completed_slots list
110 * @hw_desc: virtual address of the hardware descriptor chain
111 * @phys: hardware address of the hardware descriptor chain
112 * @group_head: first operation in a transaction
113 * @slot_cnt: total slots used in an transaction (group of operations)
114 * @slots_per_op: number of slots per operation
116 * @unmap_src_cnt: number of xor sources
117 * @unmap_len: transaction bytecount
118 * @tx_list: list of slots that make up a multi-descriptor transaction
119 * @async_tx: support for the async_tx api
120 * @xor_check_result: result of zero sum
121 * @crc32_result: result crc calculation
123 struct mv_xor_desc_slot {
124 struct list_head slot_node;
125 struct list_head chain_node;
126 struct list_head completed_node;
127 enum dma_transaction_type type;
129 struct mv_xor_desc_slot *group_head;
136 struct list_head tx_list;
137 struct dma_async_tx_descriptor async_tx;
139 u32 *xor_check_result;
143 unsigned long arrival_time;
144 struct timer_list timeout;
149 * This structure describes XOR descriptor size 64bytes. The
150 * mv_phy_src_idx() macro must be used when indexing the values of the
151 * phy_src_addr[] array. This is due to the fact that the 'descriptor
152 * swap' feature, used on big endian systems, swaps descriptors data
153 * within blocks of 8 bytes. So two consecutive values of the
154 * phy_src_addr[] array are actually swapped in big-endian, which
155 * explains the different mv_phy_src_idx() implementation.
157 #if defined(__LITTLE_ENDIAN)
159 u32 status; /* descriptor execution status */
160 u32 crc32_result; /* result of CRC-32 calculation */
161 u32 desc_command; /* type of operation to be carried out */
162 u32 phy_next_desc; /* next descriptor address pointer */
163 u32 byte_count; /* size of src/dst blocks in bytes */
164 u32 phy_dest_addr; /* destination block address */
165 u32 phy_src_addr[8]; /* source block addresses */
169 #define mv_phy_src_idx(src_idx) (src_idx)
172 u32 crc32_result; /* result of CRC-32 calculation */
173 u32 status; /* descriptor execution status */
174 u32 phy_next_desc; /* next descriptor address pointer */
175 u32 desc_command; /* type of operation to be carried out */
176 u32 phy_dest_addr; /* destination block address */
177 u32 byte_count; /* size of src/dst blocks in bytes */
178 u32 phy_src_addr[8]; /* source block addresses */
182 #define mv_phy_src_idx(src_idx) (src_idx ^ 1)
185 #define to_mv_sw_desc(addr_hw_desc) \
186 container_of(addr_hw_desc, struct mv_xor_desc_slot, hw_desc)
188 #define mv_hw_desc_slot_idx(hw_desc, idx) \
189 ((void *)(((unsigned long)hw_desc) + ((idx) << 5)))
191 #define MV_XOR_MIN_BYTE_COUNT (128)
192 #define XOR_MAX_BYTE_COUNT ((16 * 1024 * 1024) - 1)
193 #define MV_XOR_MAX_BYTE_COUNT XOR_MAX_BYTE_COUNT