1 /*
2 * Copyright © 2006, Intel Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
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 for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 */
18 #ifndef IOP_ADMA_H
19 #define IOP_ADMA_H
20 #include <linux/types.h>
21 #include <linux/dmaengine.h>
22 #include <linux/interrupt.h>
23
24 #define IOP_ADMA_SLOT_SIZE 32
25 #define IOP_ADMA_THRESHOLD 4
26
27 /**
28 * struct iop_adma_device - internal representation of an ADMA device
29 * @pdev: Platform device
30 * @id: HW ADMA Device selector
31 * @dma_desc_pool: base of DMA descriptor region (DMA address)
32 * @dma_desc_pool_virt: base of DMA descriptor region (CPU address)
33 * @common: embedded struct dma_device
34 */
35 struct iop_adma_device {
36 struct platform_device *pdev;
37 int id;
38 dma_addr_t dma_desc_pool;
39 void *dma_desc_pool_virt;
40 struct dma_device common;
41 };
42
43 /**
44 * struct iop_adma_chan - internal representation of an ADMA device
45 * @pending: allows batching of hardware operations
46 * @completed_cookie: identifier for the most recently completed operation
47 * @lock: serializes enqueue/dequeue operations to the slot pool
48 * @mmr_base: memory mapped register base
49 * @chain: device chain view of the descriptors
50 * @device: parent device
51 * @common: common dmaengine channel object members
52 * @last_used: place holder for allocation to continue from where it left off
53 * @all_slots: complete domain of slots usable by the channel
54 * @cleanup_watchdog: workaround missed interrupts on iop3xx
55 * @slots_allocated: records the actual size of the descriptor slot pool
56 * @irq_tasklet: bottom half where iop_adma_slot_cleanup runs
57 */
58 struct iop_adma_chan {
59 int pending;
60 dma_cookie_t completed_cookie;
61 spinlock_t lock; /* protects the descriptor slot pool */
62 void __iomem *mmr_base;
63 struct list_head chain;
64 struct iop_adma_device *device;
65 struct dma_chan common;
66 struct iop_adma_desc_slot *last_used;
67 struct list_head all_slots;
68 struct timer_list cleanup_watchdog;
69 int slots_allocated;
70 struct tasklet_struct irq_tasklet;
71 };
72
73 /**
74 * struct iop_adma_desc_slot - IOP-ADMA software descriptor
75 * @slot_node: node on the iop_adma_chan.all_slots list
76 * @chain_node: node on the op_adma_chan.chain list
77 * @hw_desc: virtual address of the hardware descriptor chain
78 * @phys: hardware address of the hardware descriptor chain
79 * @group_head: first operation in a transaction
80 * @slot_cnt: total slots used in an transaction (group of operations)
81 * @slots_per_op: number of slots per operation
82 * @idx: pool index
83 * @unmap_src_cnt: number of xor sources
84 * @unmap_len: transaction bytecount
85 * @async_tx: support for the async_tx api
86 * @group_list: list of slots that make up a multi-descriptor transaction
87 * for example transfer lengths larger than the supported hw max
88 * @xor_check_result: result of zero sum
89 * @crc32_result: result crc calculation
90 */
91 struct iop_adma_desc_slot {
92 struct list_head slot_node;
93 struct list_head chain_node;
94 void *hw_desc;
95 struct iop_adma_desc_slot *group_head;
96 u16 slot_cnt;
97 u16 slots_per_op;
98 u16 idx;
99 u16 unmap_src_cnt;
100 size_t unmap_len;
101 struct dma_async_tx_descriptor async_tx;
102 union {
103 u32 *xor_check_result;
104 u32 *crc32_result;
105 };
106 };
107
108 struct iop_adma_platform_data {
109 int hw_id;
110 dma_cap_mask_t cap_mask;
111 size_t pool_size;
112 };
113
114 #define to_iop_sw_desc(addr_hw_desc) \
115 container_of(addr_hw_desc, struct iop_adma_desc_slot, hw_desc)
116 #define iop_hw_desc_slot_idx(hw_desc, idx) \
117 ( (void *) (((unsigned long) hw_desc) + ((idx) << 5)) )
118 #endif
119
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