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Commit | Line | Data |
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3bfb1d20 HS |
1 | /* |
2 | * Driver for the Synopsys DesignWare AHB DMA Controller | |
3 | * | |
4 | * Copyright (C) 2005-2007 Atmel Corporation | |
aecb7b64 | 5 | * Copyright (C) 2010-2011 ST Microelectronics |
3bfb1d20 HS |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
9cade1a4 | 12 | #include <linux/interrupt.h> |
0fdb567f | 13 | #include <linux/dmaengine.h> |
3d598f47 | 14 | #include <linux/platform_data/dma-dw.h> |
3bfb1d20 HS |
15 | |
16 | #define DW_DMA_MAX_NR_CHANNELS 8 | |
f9c6a655 | 17 | #define DW_DMA_MAX_NR_REQUESTS 16 |
3bfb1d20 | 18 | |
a1c46016 VK |
19 | /* flow controller */ |
20 | enum dw_dma_fc { | |
21 | DW_DMA_FC_D_M2M, | |
22 | DW_DMA_FC_D_M2P, | |
23 | DW_DMA_FC_D_P2M, | |
24 | DW_DMA_FC_D_P2P, | |
25 | DW_DMA_FC_P_P2M, | |
26 | DW_DMA_FC_SP_P2P, | |
27 | DW_DMA_FC_P_M2P, | |
28 | DW_DMA_FC_DP_P2P, | |
29 | }; | |
30 | ||
3bfb1d20 HS |
31 | /* |
32 | * Redefine this macro to handle differences between 32- and 64-bit | |
33 | * addressing, big vs. little endian, etc. | |
34 | */ | |
35 | #define DW_REG(name) u32 name; u32 __pad_##name | |
36 | ||
37 | /* Hardware register definitions. */ | |
38 | struct dw_dma_chan_regs { | |
39 | DW_REG(SAR); /* Source Address Register */ | |
40 | DW_REG(DAR); /* Destination Address Register */ | |
41 | DW_REG(LLP); /* Linked List Pointer */ | |
42 | u32 CTL_LO; /* Control Register Low */ | |
43 | u32 CTL_HI; /* Control Register High */ | |
44 | DW_REG(SSTAT); | |
45 | DW_REG(DSTAT); | |
46 | DW_REG(SSTATAR); | |
47 | DW_REG(DSTATAR); | |
48 | u32 CFG_LO; /* Configuration Register Low */ | |
49 | u32 CFG_HI; /* Configuration Register High */ | |
50 | DW_REG(SGR); | |
51 | DW_REG(DSR); | |
52 | }; | |
53 | ||
54 | struct dw_dma_irq_regs { | |
55 | DW_REG(XFER); | |
56 | DW_REG(BLOCK); | |
57 | DW_REG(SRC_TRAN); | |
58 | DW_REG(DST_TRAN); | |
59 | DW_REG(ERROR); | |
60 | }; | |
61 | ||
62 | struct dw_dma_regs { | |
63 | /* per-channel registers */ | |
64 | struct dw_dma_chan_regs CHAN[DW_DMA_MAX_NR_CHANNELS]; | |
65 | ||
66 | /* irq handling */ | |
67 | struct dw_dma_irq_regs RAW; /* r */ | |
68 | struct dw_dma_irq_regs STATUS; /* r (raw & mask) */ | |
69 | struct dw_dma_irq_regs MASK; /* rw (set = irq enabled) */ | |
70 | struct dw_dma_irq_regs CLEAR; /* w (ack, affects "raw") */ | |
71 | ||
72 | DW_REG(STATUS_INT); /* r */ | |
73 | ||
74 | /* software handshaking */ | |
75 | DW_REG(REQ_SRC); | |
76 | DW_REG(REQ_DST); | |
77 | DW_REG(SGL_REQ_SRC); | |
78 | DW_REG(SGL_REQ_DST); | |
79 | DW_REG(LAST_SRC); | |
80 | DW_REG(LAST_DST); | |
81 | ||
82 | /* miscellaneous */ | |
83 | DW_REG(CFG); | |
84 | DW_REG(CH_EN); | |
85 | DW_REG(ID); | |
86 | DW_REG(TEST); | |
87 | ||
2a9fe9ae AS |
88 | /* reserved */ |
89 | DW_REG(__reserved0); | |
90 | DW_REG(__reserved1); | |
91 | ||
745664eb | 92 | /* optional encoded params, 0x3c8..0x3f7 */ |
2a9fe9ae AS |
93 | u32 __reserved; |
94 | ||
95 | /* per-channel configuration registers */ | |
96 | u32 DWC_PARAMS[DW_DMA_MAX_NR_CHANNELS]; | |
97 | u32 MULTI_BLK_TYPE; | |
98 | u32 MAX_BLK_SIZE; | |
99 | ||
100 | /* top-level parameters */ | |
101 | u32 DW_PARAMS; | |
3bfb1d20 HS |
102 | }; |
103 | ||
e368b510 VK |
104 | /* |
105 | * Big endian I/O access when reading and writing to the DMA controller | |
106 | * registers. This is needed on some platforms, like the Atmel AVR32 | |
107 | * architecture. | |
108 | */ | |
109 | ||
d5ea7b5e HT |
110 | #ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO |
111 | #define dma_readl_native ioread32be | |
112 | #define dma_writel_native iowrite32be | |
113 | #else | |
114 | #define dma_readl_native readl | |
115 | #define dma_writel_native writel | |
116 | #endif | |
117 | ||
2a9fe9ae AS |
118 | /* To access the registers in early stage of probe */ |
119 | #define dma_read_byaddr(addr, name) \ | |
d5ea7b5e | 120 | dma_readl_native((addr) + offsetof(struct dw_dma_regs, name)) |
2a9fe9ae AS |
121 | |
122 | /* Bitfields in DW_PARAMS */ | |
123 | #define DW_PARAMS_NR_CHAN 8 /* number of channels */ | |
124 | #define DW_PARAMS_NR_MASTER 11 /* number of AHB masters */ | |
125 | #define DW_PARAMS_DATA_WIDTH(n) (15 + 2 * (n)) | |
126 | #define DW_PARAMS_DATA_WIDTH1 15 /* master 1 data width */ | |
127 | #define DW_PARAMS_DATA_WIDTH2 17 /* master 2 data width */ | |
128 | #define DW_PARAMS_DATA_WIDTH3 19 /* master 3 data width */ | |
129 | #define DW_PARAMS_DATA_WIDTH4 21 /* master 4 data width */ | |
130 | #define DW_PARAMS_EN 28 /* encoded parameters */ | |
131 | ||
132 | /* Bitfields in DWC_PARAMS */ | |
133 | #define DWC_PARAMS_MBLK_EN 11 /* multi block transfer */ | |
134 | ||
3bfb1d20 HS |
135 | /* Bitfields in CTL_LO */ |
136 | #define DWC_CTLL_INT_EN (1 << 0) /* irqs enabled? */ | |
137 | #define DWC_CTLL_DST_WIDTH(n) ((n)<<1) /* bytes per element */ | |
138 | #define DWC_CTLL_SRC_WIDTH(n) ((n)<<4) | |
139 | #define DWC_CTLL_DST_INC (0<<7) /* DAR update/not */ | |
140 | #define DWC_CTLL_DST_DEC (1<<7) | |
141 | #define DWC_CTLL_DST_FIX (2<<7) | |
142 | #define DWC_CTLL_SRC_INC (0<<7) /* SAR update/not */ | |
143 | #define DWC_CTLL_SRC_DEC (1<<9) | |
144 | #define DWC_CTLL_SRC_FIX (2<<9) | |
145 | #define DWC_CTLL_DST_MSIZE(n) ((n)<<11) /* burst, #elements */ | |
146 | #define DWC_CTLL_SRC_MSIZE(n) ((n)<<14) | |
147 | #define DWC_CTLL_S_GATH_EN (1 << 17) /* src gather, !FIX */ | |
148 | #define DWC_CTLL_D_SCAT_EN (1 << 18) /* dst scatter, !FIX */ | |
ee66509d | 149 | #define DWC_CTLL_FC(n) ((n) << 20) |
3bfb1d20 HS |
150 | #define DWC_CTLL_FC_M2M (0 << 20) /* mem-to-mem */ |
151 | #define DWC_CTLL_FC_M2P (1 << 20) /* mem-to-periph */ | |
152 | #define DWC_CTLL_FC_P2M (2 << 20) /* periph-to-mem */ | |
153 | #define DWC_CTLL_FC_P2P (3 << 20) /* periph-to-periph */ | |
154 | /* plus 4 transfer types for peripheral-as-flow-controller */ | |
155 | #define DWC_CTLL_DMS(n) ((n)<<23) /* dst master select */ | |
156 | #define DWC_CTLL_SMS(n) ((n)<<25) /* src master select */ | |
157 | #define DWC_CTLL_LLP_D_EN (1 << 27) /* dest block chain */ | |
158 | #define DWC_CTLL_LLP_S_EN (1 << 28) /* src block chain */ | |
159 | ||
160 | /* Bitfields in CTL_HI */ | |
161 | #define DWC_CTLH_DONE 0x00001000 | |
162 | #define DWC_CTLH_BLOCK_TS_MASK 0x00000fff | |
163 | ||
3d598f47 | 164 | /* Bitfields in CFG_LO. Platform-configurable bits are in <linux/platform_data/dma-dw.h> */ |
93317e8e VK |
165 | #define DWC_CFGL_CH_PRIOR_MASK (0x7 << 5) /* priority mask */ |
166 | #define DWC_CFGL_CH_PRIOR(x) ((x) << 5) /* priority */ | |
3bfb1d20 HS |
167 | #define DWC_CFGL_CH_SUSP (1 << 8) /* pause xfer */ |
168 | #define DWC_CFGL_FIFO_EMPTY (1 << 9) /* pause xfer */ | |
169 | #define DWC_CFGL_HS_DST (1 << 10) /* handshake w/dst */ | |
170 | #define DWC_CFGL_HS_SRC (1 << 11) /* handshake w/src */ | |
171 | #define DWC_CFGL_MAX_BURST(x) ((x) << 20) | |
172 | #define DWC_CFGL_RELOAD_SAR (1 << 30) | |
173 | #define DWC_CFGL_RELOAD_DAR (1 << 31) | |
174 | ||
3d598f47 | 175 | /* Bitfields in CFG_HI. Platform-configurable bits are in <linux/platform_data/dma-dw.h> */ |
3bfb1d20 HS |
176 | #define DWC_CFGH_DS_UPD_EN (1 << 5) |
177 | #define DWC_CFGH_SS_UPD_EN (1 << 6) | |
178 | ||
179 | /* Bitfields in SGR */ | |
180 | #define DWC_SGR_SGI(x) ((x) << 0) | |
181 | #define DWC_SGR_SGC(x) ((x) << 20) | |
182 | ||
183 | /* Bitfields in DSR */ | |
184 | #define DWC_DSR_DSI(x) ((x) << 0) | |
185 | #define DWC_DSR_DSC(x) ((x) << 20) | |
186 | ||
187 | /* Bitfields in CFG */ | |
188 | #define DW_CFG_DMA_EN (1 << 0) | |
189 | ||
d9de4519 HCE |
190 | enum dw_dmac_flags { |
191 | DW_DMA_IS_CYCLIC = 0, | |
fed2574b | 192 | DW_DMA_IS_SOFT_LLP = 1, |
d9de4519 HCE |
193 | }; |
194 | ||
3bfb1d20 | 195 | struct dw_dma_chan { |
0fdb567f AS |
196 | struct dma_chan chan; |
197 | void __iomem *ch_regs; | |
198 | u8 mask; | |
199 | u8 priority; | |
200 | enum dma_transfer_direction direction; | |
201 | bool paused; | |
202 | bool initialized; | |
3bfb1d20 | 203 | |
fed2574b | 204 | /* software emulation of the LLP transfers */ |
fed2574b AS |
205 | struct list_head *tx_node_active; |
206 | ||
3bfb1d20 HS |
207 | spinlock_t lock; |
208 | ||
209 | /* these other elements are all protected by lock */ | |
d9de4519 | 210 | unsigned long flags; |
3bfb1d20 HS |
211 | struct list_head active_list; |
212 | struct list_head queue; | |
213 | struct list_head free_list; | |
4702d524 | 214 | u32 residue; |
d9de4519 | 215 | struct dw_cyclic_desc *cdesc; |
3bfb1d20 | 216 | |
3bfb1d20 | 217 | unsigned int descs_allocated; |
327e6970 | 218 | |
4a63a8b3 AS |
219 | /* hardware configuration */ |
220 | unsigned int block_size; | |
fed2574b | 221 | bool nollp; |
f776076b AB |
222 | |
223 | /* custom slave configuration */ | |
89500520 AS |
224 | u8 src_id; |
225 | u8 dst_id; | |
226 | u8 src_master; | |
227 | u8 dst_master; | |
4a63a8b3 | 228 | |
327e6970 VK |
229 | /* configuration passed via DMA_SLAVE_CONFIG */ |
230 | struct dma_slave_config dma_sconfig; | |
3bfb1d20 HS |
231 | }; |
232 | ||
233 | static inline struct dw_dma_chan_regs __iomem * | |
234 | __dwc_regs(struct dw_dma_chan *dwc) | |
235 | { | |
236 | return dwc->ch_regs; | |
237 | } | |
238 | ||
239 | #define channel_readl(dwc, name) \ | |
d5ea7b5e | 240 | dma_readl_native(&(__dwc_regs(dwc)->name)) |
3bfb1d20 | 241 | #define channel_writel(dwc, name, val) \ |
d5ea7b5e | 242 | dma_writel_native((val), &(__dwc_regs(dwc)->name)) |
3bfb1d20 HS |
243 | |
244 | static inline struct dw_dma_chan *to_dw_dma_chan(struct dma_chan *chan) | |
245 | { | |
246 | return container_of(chan, struct dw_dma_chan, chan); | |
247 | } | |
248 | ||
3bfb1d20 HS |
249 | struct dw_dma { |
250 | struct dma_device dma; | |
251 | void __iomem *regs; | |
f8122a82 | 252 | struct dma_pool *desc_pool; |
3bfb1d20 | 253 | struct tasklet_struct tasklet; |
3bfb1d20 | 254 | |
000871ce AS |
255 | /* channels */ |
256 | struct dw_dma_chan *chan; | |
3bfb1d20 HS |
257 | u8 all_chan_mask; |
258 | ||
a0982004 AS |
259 | /* hardware configuration */ |
260 | unsigned char nr_masters; | |
261 | unsigned char data_width[4]; | |
3bfb1d20 HS |
262 | }; |
263 | ||
264 | static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw) | |
265 | { | |
266 | return dw->regs; | |
267 | } | |
268 | ||
269 | #define dma_readl(dw, name) \ | |
d5ea7b5e | 270 | dma_readl_native(&(__dw_regs(dw)->name)) |
3bfb1d20 | 271 | #define dma_writel(dw, name, val) \ |
d5ea7b5e | 272 | dma_writel_native((val), &(__dw_regs(dw)->name)) |
3bfb1d20 HS |
273 | |
274 | #define channel_set_bit(dw, reg, mask) \ | |
275 | dma_writel(dw, reg, ((mask) << 8) | (mask)) | |
276 | #define channel_clear_bit(dw, reg, mask) \ | |
277 | dma_writel(dw, reg, ((mask) << 8) | 0) | |
278 | ||
279 | static inline struct dw_dma *to_dw_dma(struct dma_device *ddev) | |
280 | { | |
281 | return container_of(ddev, struct dw_dma, dma); | |
282 | } | |
283 | ||
284 | /* LLI == Linked List Item; a.k.a. DMA block descriptor */ | |
285 | struct dw_lli { | |
286 | /* values that are not changed by hardware */ | |
f8609c2b AS |
287 | u32 sar; |
288 | u32 dar; | |
289 | u32 llp; /* chain to next lli */ | |
3bfb1d20 HS |
290 | u32 ctllo; |
291 | /* values that may get written back: */ | |
292 | u32 ctlhi; | |
293 | /* sstat and dstat can snapshot peripheral register state. | |
294 | * silicon config may discard either or both... | |
295 | */ | |
296 | u32 sstat; | |
297 | u32 dstat; | |
298 | }; | |
299 | ||
300 | struct dw_desc { | |
301 | /* FIRST values the hardware uses */ | |
302 | struct dw_lli lli; | |
303 | ||
304 | /* THEN values for driver housekeeping */ | |
305 | struct list_head desc_node; | |
e0bd0f8c | 306 | struct list_head tx_list; |
3bfb1d20 HS |
307 | struct dma_async_tx_descriptor txd; |
308 | size_t len; | |
30d38a32 | 309 | size_t total_len; |
3bfb1d20 HS |
310 | }; |
311 | ||
e63a47a3 AS |
312 | #define to_dw_desc(h) list_entry(h, struct dw_desc, desc_node) |
313 | ||
3bfb1d20 HS |
314 | static inline struct dw_desc * |
315 | txd_to_dw_desc(struct dma_async_tx_descriptor *txd) | |
316 | { | |
317 | return container_of(txd, struct dw_desc, txd); | |
318 | } |