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
17 #include <linux/types.h>
19 #include <linux/dmaengine.h>
20 #include <linux/interrupt.h>
22 #define MV_XOR_POOL_SIZE (MV_XOR_SLOT_SIZE * 3072)
23 #define MV_XOR_SLOT_SIZE 64
24 #define MV_XOR_THRESHOLD 1
25 #define MV_XOR_MAX_CHANNELS 2
27 #define MV_XOR_MIN_BYTE_COUNT SZ_128
28 #define MV_XOR_MAX_BYTE_COUNT (SZ_16M - 1)
30 /* Values for the XOR_CONFIG register */
31 #define XOR_OPERATION_MODE_XOR 0
32 #define XOR_OPERATION_MODE_MEMCPY 2
33 #define XOR_OPERATION_MODE_IN_DESC 7
34 #define XOR_DESCRIPTOR_SWAP BIT(14)
35 #define XOR_DESC_SUCCESS 0x40000000
37 #define XOR_DESC_OPERATION_XOR (0 << 24)
38 #define XOR_DESC_OPERATION_CRC32C (1 << 24)
39 #define XOR_DESC_OPERATION_MEMCPY (2 << 24)
41 #define XOR_DESC_DMA_OWNED BIT(31)
42 #define XOR_DESC_EOD_INT_EN BIT(31)
44 #define XOR_CURR_DESC(chan) (chan->mmr_high_base + 0x10 + (chan->idx * 4))
45 #define XOR_NEXT_DESC(chan) (chan->mmr_high_base + 0x00 + (chan->idx * 4))
46 #define XOR_BYTE_COUNT(chan) (chan->mmr_high_base + 0x20 + (chan->idx * 4))
47 #define XOR_DEST_POINTER(chan) (chan->mmr_high_base + 0xB0 + (chan->idx * 4))
48 #define XOR_BLOCK_SIZE(chan) (chan->mmr_high_base + 0xC0 + (chan->idx * 4))
49 #define XOR_INIT_VALUE_LOW(chan) (chan->mmr_high_base + 0xE0)
50 #define XOR_INIT_VALUE_HIGH(chan) (chan->mmr_high_base + 0xE4)
52 #define XOR_CONFIG(chan) (chan->mmr_base + 0x10 + (chan->idx * 4))
53 #define XOR_ACTIVATION(chan) (chan->mmr_base + 0x20 + (chan->idx * 4))
54 #define XOR_INTR_CAUSE(chan) (chan->mmr_base + 0x30)
55 #define XOR_INTR_MASK(chan) (chan->mmr_base + 0x40)
56 #define XOR_ERROR_CAUSE(chan) (chan->mmr_base + 0x50)
57 #define XOR_ERROR_ADDR(chan) (chan->mmr_base + 0x60)
59 #define XOR_INT_END_OF_DESC BIT(0)
60 #define XOR_INT_END_OF_CHAIN BIT(1)
61 #define XOR_INT_STOPPED BIT(2)
62 #define XOR_INT_PAUSED BIT(3)
63 #define XOR_INT_ERR_DECODE BIT(4)
64 #define XOR_INT_ERR_RDPROT BIT(5)
65 #define XOR_INT_ERR_WRPROT BIT(6)
66 #define XOR_INT_ERR_OWN BIT(7)
67 #define XOR_INT_ERR_PAR BIT(8)
68 #define XOR_INT_ERR_MBUS BIT(9)
70 #define XOR_INTR_ERRORS (XOR_INT_ERR_DECODE | XOR_INT_ERR_RDPROT | \
71 XOR_INT_ERR_WRPROT | XOR_INT_ERR_OWN | \
72 XOR_INT_ERR_PAR | XOR_INT_ERR_MBUS)
74 #define XOR_INTR_MASK_VALUE (XOR_INT_END_OF_DESC | XOR_INT_END_OF_CHAIN | \
75 XOR_INT_STOPPED | XOR_INTR_ERRORS)
77 #define WINDOW_BASE(w) (0x50 + ((w) << 2))
78 #define WINDOW_SIZE(w) (0x70 + ((w) << 2))
79 #define WINDOW_REMAP_HIGH(w) (0x90 + ((w) << 2))
80 #define WINDOW_BAR_ENABLE(chan) (0x40 + ((chan) << 2))
81 #define WINDOW_OVERRIDE_CTRL(chan) (0xA0 + ((chan) << 2))
83 struct mv_xor_device {
84 void __iomem *xor_base;
85 void __iomem *xor_high_base;
87 struct mv_xor_chan *channels[MV_XOR_MAX_CHANNELS];
91 * struct mv_xor_chan - internal representation of a XOR channel
92 * @pending: allows batching of hardware operations
93 * @lock: serializes enqueue/dequeue operations to the descriptors pool
94 * @mmr_base: memory mapped register base
95 * @idx: the index of the xor channel
96 * @chain: device chain view of the descriptors
97 * @free_slots: free slots usable by the channel
98 * @allocated_slots: slots allocated by the driver
99 * @completed_slots: slots completed by HW but still need to be acked
100 * @device: parent device
101 * @common: common dmaengine channel object members
102 * @slots_allocated: records the actual size of the descriptor slot pool
103 * @irq_tasklet: bottom half where mv_xor_slot_cleanup runs
104 * @op_in_desc: new mode of driver, each op is writen to descriptor.
108 spinlock_t lock; /* protects the descriptor slot pool */
109 void __iomem *mmr_base;
110 void __iomem *mmr_high_base;
113 enum dma_transaction_type current_type;
114 struct list_head chain;
115 struct list_head free_slots;
116 struct list_head allocated_slots;
117 struct list_head completed_slots;
118 dma_addr_t dma_desc_pool;
119 void *dma_desc_pool_virt;
121 struct dma_device dmadev;
122 struct dma_chan dmachan;
124 struct tasklet_struct irq_tasklet;
126 char dummy_src[MV_XOR_MIN_BYTE_COUNT];
127 char dummy_dst[MV_XOR_MIN_BYTE_COUNT];
128 dma_addr_t dummy_src_addr, dummy_dst_addr;
132 * struct mv_xor_desc_slot - software descriptor
133 * @node: node on the mv_xor_chan lists
134 * @hw_desc: virtual address of the hardware descriptor chain
135 * @phys: hardware address of the hardware descriptor chain
136 * @slot_used: slot in use or not
138 * @tx_list: list of slots that make up a multi-descriptor transaction
139 * @async_tx: support for the async_tx api
141 struct mv_xor_desc_slot {
142 struct list_head node;
143 enum dma_transaction_type type;
146 struct dma_async_tx_descriptor async_tx;
150 * This structure describes XOR descriptor size 64bytes. The
151 * mv_phy_src_idx() macro must be used when indexing the values of the
152 * phy_src_addr[] array. This is due to the fact that the 'descriptor
153 * swap' feature, used on big endian systems, swaps descriptors data
154 * within blocks of 8 bytes. So two consecutive values of the
155 * phy_src_addr[] array are actually swapped in big-endian, which
156 * explains the different mv_phy_src_idx() implementation.
158 #if defined(__LITTLE_ENDIAN)
160 u32 status; /* descriptor execution status */
161 u32 crc32_result; /* result of CRC-32 calculation */
162 u32 desc_command; /* type of operation to be carried out */
163 u32 phy_next_desc; /* next descriptor address pointer */
164 u32 byte_count; /* size of src/dst blocks in bytes */
165 u32 phy_dest_addr; /* destination block address */
166 u32 phy_src_addr[8]; /* source block addresses */
170 #define mv_phy_src_idx(src_idx) (src_idx)
173 u32 crc32_result; /* result of CRC-32 calculation */
174 u32 status; /* descriptor execution status */
175 u32 phy_next_desc; /* next descriptor address pointer */
176 u32 desc_command; /* type of operation to be carried out */
177 u32 phy_dest_addr; /* destination block address */
178 u32 byte_count; /* size of src/dst blocks in bytes */
179 u32 phy_src_addr[8]; /* source block addresses */
183 #define mv_phy_src_idx(src_idx) (src_idx ^ 1)
186 #define to_mv_sw_desc(addr_hw_desc) \
187 container_of(addr_hw_desc, struct mv_xor_desc_slot, hw_desc)
189 #define mv_hw_desc_slot_idx(hw_desc, idx) \
190 ((void *)(((unsigned long)hw_desc) + ((idx) << 5)))