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8d318a50 | 1 | /* |
767a9675 | 2 | * Copyright (C) ST-Ericsson SA 2007-2010 |
661385f9 | 3 | * Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson |
767a9675 | 4 | * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson |
8d318a50 | 5 | * License terms: GNU General Public License (GPL) version 2 |
8d318a50 LW |
6 | */ |
7 | ||
8 | ||
9 | #ifndef STE_DMA40_H | |
10 | #define STE_DMA40_H | |
11 | ||
12 | #include <linux/dmaengine.h> | |
b7f080cf | 13 | #include <linux/scatterlist.h> |
8d318a50 LW |
14 | #include <linux/workqueue.h> |
15 | #include <linux/interrupt.h> | |
8d318a50 | 16 | |
d49278e3 PF |
17 | /* |
18 | * Maxium size for a single dma descriptor | |
19 | * Size is limited to 16 bits. | |
20 | * Size is in the units of addr-widths (1,2,4,8 bytes) | |
21 | * Larger transfers will be split up to multiple linked desc | |
22 | */ | |
23 | #define STEDMA40_MAX_SEG_SIZE 0xFFFF | |
24 | ||
8d318a50 LW |
25 | /* dev types for memcpy */ |
26 | #define STEDMA40_DEV_DST_MEMORY (-1) | |
27 | #define STEDMA40_DEV_SRC_MEMORY (-1) | |
28 | ||
38bdbf02 RV |
29 | enum stedma40_mode { |
30 | STEDMA40_MODE_LOGICAL = 0, | |
31 | STEDMA40_MODE_PHYSICAL, | |
32 | STEDMA40_MODE_OPERATION, | |
33 | }; | |
8d318a50 | 34 | |
20a5b6d0 RV |
35 | enum stedma40_mode_opt { |
36 | STEDMA40_PCHAN_BASIC_MODE = 0, | |
37 | STEDMA40_LCHAN_SRC_LOG_DST_LOG = 0, | |
38 | STEDMA40_PCHAN_MODULO_MODE, | |
39 | STEDMA40_PCHAN_DOUBLE_DST_MODE, | |
40 | STEDMA40_LCHAN_SRC_PHY_DST_LOG, | |
41 | STEDMA40_LCHAN_SRC_LOG_DST_PHY, | |
42 | }; | |
8d318a50 LW |
43 | |
44 | #define STEDMA40_ESIZE_8_BIT 0x0 | |
45 | #define STEDMA40_ESIZE_16_BIT 0x1 | |
46 | #define STEDMA40_ESIZE_32_BIT 0x2 | |
47 | #define STEDMA40_ESIZE_64_BIT 0x3 | |
48 | ||
49 | /* The value 4 indicates that PEN-reg shall be set to 0 */ | |
50 | #define STEDMA40_PSIZE_PHY_1 0x4 | |
51 | #define STEDMA40_PSIZE_PHY_2 0x0 | |
52 | #define STEDMA40_PSIZE_PHY_4 0x1 | |
53 | #define STEDMA40_PSIZE_PHY_8 0x2 | |
54 | #define STEDMA40_PSIZE_PHY_16 0x3 | |
55 | ||
56 | /* | |
57 | * The number of elements differ in logical and | |
58 | * physical mode | |
59 | */ | |
60 | #define STEDMA40_PSIZE_LOG_1 STEDMA40_PSIZE_PHY_2 | |
61 | #define STEDMA40_PSIZE_LOG_4 STEDMA40_PSIZE_PHY_4 | |
62 | #define STEDMA40_PSIZE_LOG_8 STEDMA40_PSIZE_PHY_8 | |
63 | #define STEDMA40_PSIZE_LOG_16 STEDMA40_PSIZE_PHY_16 | |
64 | ||
767a9675 JA |
65 | /* Maximum number of possible physical channels */ |
66 | #define STEDMA40_MAX_PHYS 32 | |
67 | ||
8d318a50 LW |
68 | enum stedma40_flow_ctrl { |
69 | STEDMA40_NO_FLOW_CTRL, | |
70 | STEDMA40_FLOW_CTRL, | |
71 | }; | |
72 | ||
8d318a50 LW |
73 | enum stedma40_periph_data_width { |
74 | STEDMA40_BYTE_WIDTH = STEDMA40_ESIZE_8_BIT, | |
75 | STEDMA40_HALFWORD_WIDTH = STEDMA40_ESIZE_16_BIT, | |
76 | STEDMA40_WORD_WIDTH = STEDMA40_ESIZE_32_BIT, | |
77 | STEDMA40_DOUBLEWORD_WIDTH = STEDMA40_ESIZE_64_BIT | |
78 | }; | |
79 | ||
3c0f2401 | 80 | /** |
5d489a43 | 81 | * struct stedma40_half_channel_info - dst/src channel configuration |
3c0f2401 | 82 | * |
51f5d744 | 83 | * @big_endian: true if the src/dst should be read as big endian |
3c0f2401 JA |
84 | * @data_width: Data width of the src/dst hardware |
85 | * @p_size: Burst size | |
86 | * @flow_ctrl: Flow control on/off. | |
87 | */ | |
88 | struct stedma40_half_channel_info { | |
51f5d744 | 89 | bool big_endian; |
3c0f2401 JA |
90 | enum stedma40_periph_data_width data_width; |
91 | int psize; | |
92 | enum stedma40_flow_ctrl flow_ctrl; | |
93 | }; | |
94 | ||
8d318a50 LW |
95 | /** |
96 | * struct stedma40_chan_cfg - Structure to be filled by client drivers. | |
97 | * | |
98 | * @dir: MEM 2 MEM, PERIPH 2 MEM , MEM 2 PERIPH, PERIPH 2 PERIPH | |
730c1871 | 99 | * @high_priority: true if high-priority |
ac2c0a38 RV |
100 | * @realtime: true if realtime mode is to be enabled. Only available on DMA40 |
101 | * version 3+, i.e DB8500v2+ | |
38bdbf02 | 102 | * @mode: channel mode: physical, logical, or operation |
20a5b6d0 | 103 | * @mode_opt: options for the chosen channel mode |
26955c07 | 104 | * @dev_type: src/dst device type (driver uses dir to figure out which) |
8d318a50 LW |
105 | * @src_info: Parameters for dst half channel |
106 | * @dst_info: Parameters for dst half channel | |
5cd326fd N |
107 | * @use_fixed_channel: if true, use physical channel specified by phy_channel |
108 | * @phy_channel: physical channel to use, only if use_fixed_channel is true | |
8d318a50 LW |
109 | * |
110 | * This structure has to be filled by the client drivers. | |
111 | * It is recommended to do all dma configurations for clients in the machine. | |
112 | * | |
113 | */ | |
114 | struct stedma40_chan_cfg { | |
e7bab58b | 115 | enum dma_transfer_direction dir; |
730c1871 | 116 | bool high_priority; |
ac2c0a38 | 117 | bool realtime; |
38bdbf02 | 118 | enum stedma40_mode mode; |
20a5b6d0 | 119 | enum stedma40_mode_opt mode_opt; |
26955c07 | 120 | int dev_type; |
8d318a50 LW |
121 | struct stedma40_half_channel_info src_info; |
122 | struct stedma40_half_channel_info dst_info; | |
5cd326fd N |
123 | |
124 | bool use_fixed_channel; | |
125 | int phy_channel; | |
8d318a50 LW |
126 | }; |
127 | ||
128 | /** | |
129 | * struct stedma40_platform_data - Configuration struct for the dma device. | |
130 | * | |
8d318a50 LW |
131 | * @dev_tx: mapping between destination event line and io address |
132 | * @dev_rx: mapping between source event line and io address | |
59516725 JA |
133 | * @disabled_channels: A vector, ending with -1, that marks physical channels |
134 | * that are for different reasons not available for the driver. | |
7407048b FB |
135 | * @soft_lli_chans: A vector, that marks physical channels will use LLI by SW |
136 | * which avoids HW bug that exists in some versions of the controller. | |
137 | * SoftLLI introduces relink overhead that could impact performace for | |
138 | * certain use cases. | |
139 | * @num_of_soft_lli_chans: The number of channels that needs to be configured | |
140 | * to use SoftLLI. | |
762eb33f | 141 | * @use_esram_lcla: flag for mapping the lcla into esram region |
47db92f4 GB |
142 | * @num_of_phy_chans: The number of physical channels implemented in HW. |
143 | * 0 means reading the number of channels from DMA HW but this is only valid | |
144 | * for 'multiple of 4' channels, like 8. | |
8d318a50 LW |
145 | */ |
146 | struct stedma40_platform_data { | |
767a9675 | 147 | int disabled_channels[STEDMA40_MAX_PHYS]; |
7407048b FB |
148 | int *soft_lli_chans; |
149 | int num_of_soft_lli_chans; | |
28c7a19d | 150 | bool use_esram_lcla; |
47db92f4 | 151 | int num_of_phy_chans; |
8d318a50 LW |
152 | }; |
153 | ||
9646b798 | 154 | #ifdef CONFIG_STE_DMA40 |
8d318a50 LW |
155 | |
156 | /** | |
157 | * stedma40_filter() - Provides stedma40_chan_cfg to the | |
158 | * ste_dma40 dma driver via the dmaengine framework. | |
159 | * does some checking of what's provided. | |
160 | * | |
161 | * Never directly called by client. It used by dmaengine. | |
162 | * @chan: dmaengine handle. | |
163 | * @data: Must be of type: struct stedma40_chan_cfg and is | |
164 | * the configuration of the framework. | |
165 | * | |
166 | * | |
167 | */ | |
168 | ||
169 | bool stedma40_filter(struct dma_chan *chan, void *data); | |
170 | ||
8d318a50 LW |
171 | /** |
172 | * stedma40_slave_mem() - Transfers a raw data buffer to or from a slave | |
173 | * (=device) | |
174 | * | |
175 | * @chan: dmaengine handle | |
176 | * @addr: source or destination physicall address. | |
177 | * @size: bytes to transfer | |
178 | * @direction: direction of transfer | |
179 | * @flags: is actually enum dma_ctrl_flags. See dmaengine.h | |
180 | */ | |
181 | ||
182 | static inline struct | |
183 | dma_async_tx_descriptor *stedma40_slave_mem(struct dma_chan *chan, | |
184 | dma_addr_t addr, | |
185 | unsigned int size, | |
db8196df | 186 | enum dma_transfer_direction direction, |
8d318a50 LW |
187 | unsigned long flags) |
188 | { | |
189 | struct scatterlist sg; | |
190 | sg_init_table(&sg, 1); | |
191 | sg.dma_address = addr; | |
192 | sg.length = size; | |
193 | ||
16052827 | 194 | return dmaengine_prep_slave_sg(chan, &sg, 1, direction, flags); |
8d318a50 LW |
195 | } |
196 | ||
9646b798 LW |
197 | #else |
198 | static inline bool stedma40_filter(struct dma_chan *chan, void *data) | |
199 | { | |
200 | return false; | |
201 | } | |
202 | ||
203 | static inline struct | |
204 | dma_async_tx_descriptor *stedma40_slave_mem(struct dma_chan *chan, | |
205 | dma_addr_t addr, | |
206 | unsigned int size, | |
db8196df | 207 | enum dma_transfer_direction direction, |
9646b798 LW |
208 | unsigned long flags) |
209 | { | |
210 | return NULL; | |
211 | } | |
212 | #endif | |
213 | ||
8d318a50 | 214 | #endif |