1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (C) 2017-2020 Xilinx, Inc. All rights reserved.
4 * Copyright (C) 2022, Advanced Micro Devices, Inc.
7 #ifndef __DMA_XDMA_REGS_H
8 #define __DMA_XDMA_REGS_H
10 /* The length of register space exposed to host */
11 #define XDMA_REG_SPACE_LEN 65536
14 * maximum number of DMA channels for each direction:
15 * Host to Card (H2C) or Card to Host (C2H)
17 #define XDMA_MAX_CHANNELS 4
20 * macros to define the number of descriptor blocks can be used in one
21 * DMA transfer request.
22 * the DMA engine uses a linked list of descriptor blocks that specify the
23 * source, destination, and length of the DMA transfers.
25 #define XDMA_DESC_BLOCK_NUM BIT(7)
26 #define XDMA_DESC_BLOCK_MASK (XDMA_DESC_BLOCK_NUM - 1)
28 /* descriptor definitions */
29 #define XDMA_DESC_ADJACENT 32
30 #define XDMA_DESC_ADJACENT_MASK (XDMA_DESC_ADJACENT - 1)
31 #define XDMA_DESC_ADJACENT_BITS GENMASK(13, 8)
32 #define XDMA_DESC_MAGIC 0xad4bUL
33 #define XDMA_DESC_MAGIC_BITS GENMASK(31, 16)
34 #define XDMA_DESC_FLAGS_BITS GENMASK(7, 0)
35 #define XDMA_DESC_STOPPED BIT(0)
36 #define XDMA_DESC_COMPLETED BIT(1)
37 #define XDMA_DESC_BLEN_BITS 28
38 #define XDMA_DESC_BLEN_MAX (BIT(XDMA_DESC_BLEN_BITS) - PAGE_SIZE)
40 /* macros to construct the descriptor control word */
41 #define XDMA_DESC_CONTROL(adjacent, flag) \
42 (FIELD_PREP(XDMA_DESC_MAGIC_BITS, XDMA_DESC_MAGIC) | \
43 FIELD_PREP(XDMA_DESC_ADJACENT_BITS, (adjacent) - 1) | \
44 FIELD_PREP(XDMA_DESC_FLAGS_BITS, (flag)))
45 #define XDMA_DESC_CONTROL_LAST \
46 XDMA_DESC_CONTROL(1, XDMA_DESC_STOPPED | XDMA_DESC_COMPLETED)
47 #define XDMA_DESC_CONTROL_CYCLIC \
48 XDMA_DESC_CONTROL(1, XDMA_DESC_COMPLETED)
51 * Descriptor for a single contiguous memory block transfer.
53 * Multiple descriptors are linked by means of the next pointer. An additional
54 * extra adjacent number gives the amount of extra contiguous descriptors.
56 * The descriptors are in root complex memory, and the bytes in the 32-bit
57 * words must be in little-endian byte ordering.
67 #define XDMA_DESC_SIZE sizeof(struct xdma_hw_desc)
68 #define XDMA_DESC_BLOCK_SIZE (XDMA_DESC_SIZE * XDMA_DESC_ADJACENT)
69 #define XDMA_DESC_BLOCK_ALIGN 4096
74 #define XDMA_CHAN_IDENTIFIER 0x0
75 #define XDMA_CHAN_CONTROL 0x4
76 #define XDMA_CHAN_CONTROL_W1S 0x8
77 #define XDMA_CHAN_CONTROL_W1C 0xc
78 #define XDMA_CHAN_STATUS 0x40
79 #define XDMA_CHAN_COMPLETED_DESC 0x48
80 #define XDMA_CHAN_ALIGNMENTS 0x4c
81 #define XDMA_CHAN_INTR_ENABLE 0x90
82 #define XDMA_CHAN_INTR_ENABLE_W1S 0x94
83 #define XDMA_CHAN_INTR_ENABLE_W1C 0x9c
85 #define XDMA_CHAN_STRIDE 0x100
86 #define XDMA_CHAN_H2C_OFFSET 0x0
87 #define XDMA_CHAN_C2H_OFFSET 0x1000
88 #define XDMA_CHAN_H2C_TARGET 0x0
89 #define XDMA_CHAN_C2H_TARGET 0x1
91 /* macro to check if channel is available */
92 #define XDMA_CHAN_MAGIC 0x1fc0
93 #define XDMA_CHAN_CHECK_TARGET(id, target) \
94 (((u32)(id) >> 16) == XDMA_CHAN_MAGIC + (target))
96 /* bits of the channel control register */
97 #define CHAN_CTRL_RUN_STOP BIT(0)
98 #define CHAN_CTRL_IE_DESC_STOPPED BIT(1)
99 #define CHAN_CTRL_IE_DESC_COMPLETED BIT(2)
100 #define CHAN_CTRL_IE_DESC_ALIGN_MISMATCH BIT(3)
101 #define CHAN_CTRL_IE_MAGIC_STOPPED BIT(4)
102 #define CHAN_CTRL_IE_IDLE_STOPPED BIT(6)
103 #define CHAN_CTRL_IE_READ_ERROR GENMASK(13, 9)
104 #define CHAN_CTRL_IE_DESC_ERROR GENMASK(23, 19)
105 #define CHAN_CTRL_NON_INCR_ADDR BIT(25)
106 #define CHAN_CTRL_POLL_MODE_WB BIT(26)
108 #define CHAN_CTRL_START (CHAN_CTRL_RUN_STOP | \
109 CHAN_CTRL_IE_DESC_STOPPED | \
110 CHAN_CTRL_IE_DESC_COMPLETED | \
111 CHAN_CTRL_IE_DESC_ALIGN_MISMATCH | \
112 CHAN_CTRL_IE_MAGIC_STOPPED | \
113 CHAN_CTRL_IE_READ_ERROR | \
114 CHAN_CTRL_IE_DESC_ERROR)
116 /* bits of the channel interrupt enable mask */
117 #define CHAN_IM_DESC_ERROR BIT(19)
118 #define CHAN_IM_READ_ERROR BIT(9)
119 #define CHAN_IM_IDLE_STOPPED BIT(6)
120 #define CHAN_IM_MAGIC_STOPPED BIT(4)
121 #define CHAN_IM_DESC_COMPLETED BIT(2)
122 #define CHAN_IM_DESC_STOPPED BIT(1)
124 #define CHAN_IM_ALL (CHAN_IM_DESC_ERROR | CHAN_IM_READ_ERROR | \
125 CHAN_IM_IDLE_STOPPED | CHAN_IM_MAGIC_STOPPED | \
126 CHAN_IM_DESC_COMPLETED | CHAN_IM_DESC_STOPPED)
129 * Channel SGDMA registers
131 #define XDMA_SGDMA_IDENTIFIER 0x4000
132 #define XDMA_SGDMA_DESC_LO 0x4080
133 #define XDMA_SGDMA_DESC_HI 0x4084
134 #define XDMA_SGDMA_DESC_ADJ 0x4088
135 #define XDMA_SGDMA_DESC_CREDIT 0x408c
137 /* bits of the SG DMA control register */
138 #define XDMA_CTRL_RUN_STOP BIT(0)
139 #define XDMA_CTRL_IE_DESC_STOPPED BIT(1)
140 #define XDMA_CTRL_IE_DESC_COMPLETED BIT(2)
141 #define XDMA_CTRL_IE_DESC_ALIGN_MISMATCH BIT(3)
142 #define XDMA_CTRL_IE_MAGIC_STOPPED BIT(4)
143 #define XDMA_CTRL_IE_IDLE_STOPPED BIT(6)
144 #define XDMA_CTRL_IE_READ_ERROR GENMASK(13, 9)
145 #define XDMA_CTRL_IE_DESC_ERROR GENMASK(23, 19)
146 #define XDMA_CTRL_NON_INCR_ADDR BIT(25)
147 #define XDMA_CTRL_POLL_MODE_WB BIT(26)
150 * interrupt registers
152 #define XDMA_IRQ_IDENTIFIER 0x2000
153 #define XDMA_IRQ_USER_INT_EN 0x2004
154 #define XDMA_IRQ_USER_INT_EN_W1S 0x2008
155 #define XDMA_IRQ_USER_INT_EN_W1C 0x200c
156 #define XDMA_IRQ_CHAN_INT_EN 0x2010
157 #define XDMA_IRQ_CHAN_INT_EN_W1S 0x2014
158 #define XDMA_IRQ_CHAN_INT_EN_W1C 0x2018
159 #define XDMA_IRQ_USER_INT_REQ 0x2040
160 #define XDMA_IRQ_CHAN_INT_REQ 0x2044
161 #define XDMA_IRQ_USER_INT_PEND 0x2048
162 #define XDMA_IRQ_CHAN_INT_PEND 0x204c
163 #define XDMA_IRQ_USER_VEC_NUM 0x2080
164 #define XDMA_IRQ_CHAN_VEC_NUM 0x20a0
166 #define XDMA_IRQ_VEC_SHIFT 8
168 #endif /* __DMA_XDMA_REGS_H */