1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Driver for the Atmel Extensible DMA Controller (aka XDMAC on AT91 systems) |
4 | * |
5 | * Copyright (C) 2014 Atmel Corporation |
6 | * |
7 | * Author: Ludovic Desroches <ludovic.desroches@atmel.com> |
8 | */ |
9 | |
10 | #include <asm/barrier.h> |
11 | #include <dt-bindings/dma/at91.h> |
12 | #include <linux/clk.h> |
13 | #include <linux/dmaengine.h> |
14 | #include <linux/dmapool.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/irq.h> |
17 | #include <linux/kernel.h> |
18 | #include <linux/list.h> |
19 | #include <linux/module.h> |
20 | #include <linux/of_dma.h> |
21 | #include <linux/of_platform.h> |
22 | #include <linux/platform_device.h> |
23 | #include <linux/pm.h> |
24 | #include <linux/pm_runtime.h> |
25 | |
26 | #include "dmaengine.h" |
27 | |
28 | /* Global registers */ |
29 | #define AT_XDMAC_GTYPE 0x00 /* Global Type Register */ |
30 | #define AT_XDMAC_NB_CH(i) (((i) & 0x1F) + 1) /* Number of Channels Minus One */ |
31 | #define AT_XDMAC_FIFO_SZ(i) (((i) >> 5) & 0x7FF) /* Number of Bytes */ |
32 | #define AT_XDMAC_NB_REQ(i) ((((i) >> 16) & 0x3F) + 1) /* Number of Peripheral Requests Minus One */ |
33 | #define AT_XDMAC_GCFG 0x04 /* Global Configuration Register */ |
34 | #define AT_XDMAC_WRHP(i) (((i) & 0xF) << 4) |
35 | #define AT_XDMAC_WRMP(i) (((i) & 0xF) << 8) |
36 | #define AT_XDMAC_WRLP(i) (((i) & 0xF) << 12) |
37 | #define AT_XDMAC_RDHP(i) (((i) & 0xF) << 16) |
38 | #define AT_XDMAC_RDMP(i) (((i) & 0xF) << 20) |
39 | #define AT_XDMAC_RDLP(i) (((i) & 0xF) << 24) |
40 | #define AT_XDMAC_RDSG(i) (((i) & 0xF) << 28) |
41 | #define AT_XDMAC_GCFG_M2M (AT_XDMAC_RDLP(0xF) | AT_XDMAC_WRLP(0xF)) |
42 | #define AT_XDMAC_GCFG_P2M (AT_XDMAC_RDSG(0x1) | AT_XDMAC_RDHP(0x3) | \ |
43 | AT_XDMAC_WRHP(0x5)) |
44 | #define AT_XDMAC_GWAC 0x08 /* Global Weighted Arbiter Configuration Register */ |
45 | #define AT_XDMAC_PW0(i) (((i) & 0xF) << 0) |
46 | #define AT_XDMAC_PW1(i) (((i) & 0xF) << 4) |
47 | #define AT_XDMAC_PW2(i) (((i) & 0xF) << 8) |
48 | #define AT_XDMAC_PW3(i) (((i) & 0xF) << 12) |
49 | #define AT_XDMAC_GWAC_M2M 0 |
50 | #define AT_XDMAC_GWAC_P2M (AT_XDMAC_PW0(0xF) | AT_XDMAC_PW2(0xF)) |
51 | |
52 | #define AT_XDMAC_GIE 0x0C /* Global Interrupt Enable Register */ |
53 | #define AT_XDMAC_GID 0x10 /* Global Interrupt Disable Register */ |
54 | #define AT_XDMAC_GIM 0x14 /* Global Interrupt Mask Register */ |
55 | #define AT_XDMAC_GIS 0x18 /* Global Interrupt Status Register */ |
56 | #define AT_XDMAC_GE 0x1C /* Global Channel Enable Register */ |
57 | #define AT_XDMAC_GD 0x20 /* Global Channel Disable Register */ |
58 | #define AT_XDMAC_GS 0x24 /* Global Channel Status Register */ |
59 | #define AT_XDMAC_VERSION 0xFFC /* XDMAC Version Register */ |
60 | |
61 | /* Channel relative registers offsets */ |
62 | #define AT_XDMAC_CIE 0x00 /* Channel Interrupt Enable Register */ |
63 | #define AT_XDMAC_CIE_BIE BIT(0) /* End of Block Interrupt Enable Bit */ |
64 | #define AT_XDMAC_CIE_LIE BIT(1) /* End of Linked List Interrupt Enable Bit */ |
65 | #define AT_XDMAC_CIE_DIE BIT(2) /* End of Disable Interrupt Enable Bit */ |
66 | #define AT_XDMAC_CIE_FIE BIT(3) /* End of Flush Interrupt Enable Bit */ |
67 | #define AT_XDMAC_CIE_RBEIE BIT(4) /* Read Bus Error Interrupt Enable Bit */ |
68 | #define AT_XDMAC_CIE_WBEIE BIT(5) /* Write Bus Error Interrupt Enable Bit */ |
69 | #define AT_XDMAC_CIE_ROIE BIT(6) /* Request Overflow Interrupt Enable Bit */ |
70 | #define AT_XDMAC_CID 0x04 /* Channel Interrupt Disable Register */ |
71 | #define AT_XDMAC_CID_BID BIT(0) /* End of Block Interrupt Disable Bit */ |
72 | #define AT_XDMAC_CID_LID BIT(1) /* End of Linked List Interrupt Disable Bit */ |
73 | #define AT_XDMAC_CID_DID BIT(2) /* End of Disable Interrupt Disable Bit */ |
74 | #define AT_XDMAC_CID_FID BIT(3) /* End of Flush Interrupt Disable Bit */ |
75 | #define AT_XDMAC_CID_RBEID BIT(4) /* Read Bus Error Interrupt Disable Bit */ |
76 | #define AT_XDMAC_CID_WBEID BIT(5) /* Write Bus Error Interrupt Disable Bit */ |
77 | #define AT_XDMAC_CID_ROID BIT(6) /* Request Overflow Interrupt Disable Bit */ |
78 | #define AT_XDMAC_CIM 0x08 /* Channel Interrupt Mask Register */ |
79 | #define AT_XDMAC_CIM_BIM BIT(0) /* End of Block Interrupt Mask Bit */ |
80 | #define AT_XDMAC_CIM_LIM BIT(1) /* End of Linked List Interrupt Mask Bit */ |
81 | #define AT_XDMAC_CIM_DIM BIT(2) /* End of Disable Interrupt Mask Bit */ |
82 | #define AT_XDMAC_CIM_FIM BIT(3) /* End of Flush Interrupt Mask Bit */ |
83 | #define AT_XDMAC_CIM_RBEIM BIT(4) /* Read Bus Error Interrupt Mask Bit */ |
84 | #define AT_XDMAC_CIM_WBEIM BIT(5) /* Write Bus Error Interrupt Mask Bit */ |
85 | #define AT_XDMAC_CIM_ROIM BIT(6) /* Request Overflow Interrupt Mask Bit */ |
86 | #define AT_XDMAC_CIS 0x0C /* Channel Interrupt Status Register */ |
87 | #define AT_XDMAC_CIS_BIS BIT(0) /* End of Block Interrupt Status Bit */ |
88 | #define AT_XDMAC_CIS_LIS BIT(1) /* End of Linked List Interrupt Status Bit */ |
89 | #define AT_XDMAC_CIS_DIS BIT(2) /* End of Disable Interrupt Status Bit */ |
90 | #define AT_XDMAC_CIS_FIS BIT(3) /* End of Flush Interrupt Status Bit */ |
91 | #define AT_XDMAC_CIS_RBEIS BIT(4) /* Read Bus Error Interrupt Status Bit */ |
92 | #define AT_XDMAC_CIS_WBEIS BIT(5) /* Write Bus Error Interrupt Status Bit */ |
93 | #define AT_XDMAC_CIS_ROIS BIT(6) /* Request Overflow Interrupt Status Bit */ |
94 | #define AT_XDMAC_CSA 0x10 /* Channel Source Address Register */ |
95 | #define AT_XDMAC_CDA 0x14 /* Channel Destination Address Register */ |
96 | #define AT_XDMAC_CNDA 0x18 /* Channel Next Descriptor Address Register */ |
97 | #define AT_XDMAC_CNDA_NDAIF(i) ((i) & 0x1) /* Channel x Next Descriptor Interface */ |
98 | #define AT_XDMAC_CNDA_NDA(i) ((i) & 0xfffffffc) /* Channel x Next Descriptor Address */ |
99 | #define AT_XDMAC_CNDC 0x1C /* Channel Next Descriptor Control Register */ |
100 | #define AT_XDMAC_CNDC_NDE (0x1 << 0) /* Channel x Next Descriptor Enable */ |
101 | #define AT_XDMAC_CNDC_NDSUP (0x1 << 1) /* Channel x Next Descriptor Source Update */ |
102 | #define AT_XDMAC_CNDC_NDDUP (0x1 << 2) /* Channel x Next Descriptor Destination Update */ |
103 | #define AT_XDMAC_CNDC_NDVIEW_MASK GENMASK(28, 27) |
104 | #define AT_XDMAC_CNDC_NDVIEW_NDV0 (0x0 << 3) /* Channel x Next Descriptor View 0 */ |
105 | #define AT_XDMAC_CNDC_NDVIEW_NDV1 (0x1 << 3) /* Channel x Next Descriptor View 1 */ |
106 | #define AT_XDMAC_CNDC_NDVIEW_NDV2 (0x2 << 3) /* Channel x Next Descriptor View 2 */ |
107 | #define AT_XDMAC_CNDC_NDVIEW_NDV3 (0x3 << 3) /* Channel x Next Descriptor View 3 */ |
108 | #define AT_XDMAC_CUBC 0x20 /* Channel Microblock Control Register */ |
109 | #define AT_XDMAC_CBC 0x24 /* Channel Block Control Register */ |
110 | #define AT_XDMAC_CC 0x28 /* Channel Configuration Register */ |
111 | #define AT_XDMAC_CC_TYPE (0x1 << 0) /* Channel Transfer Type */ |
112 | #define AT_XDMAC_CC_TYPE_MEM_TRAN (0x0 << 0) /* Memory to Memory Transfer */ |
113 | #define AT_XDMAC_CC_TYPE_PER_TRAN (0x1 << 0) /* Peripheral to Memory or Memory to Peripheral Transfer */ |
114 | #define AT_XDMAC_CC_MBSIZE_MASK (0x3 << 1) |
115 | #define AT_XDMAC_CC_MBSIZE_SINGLE (0x0 << 1) |
116 | #define AT_XDMAC_CC_MBSIZE_FOUR (0x1 << 1) |
117 | #define AT_XDMAC_CC_MBSIZE_EIGHT (0x2 << 1) |
118 | #define AT_XDMAC_CC_MBSIZE_SIXTEEN (0x3 << 1) |
119 | #define AT_XDMAC_CC_DSYNC (0x1 << 4) /* Channel Synchronization */ |
120 | #define AT_XDMAC_CC_DSYNC_PER2MEM (0x0 << 4) |
121 | #define AT_XDMAC_CC_DSYNC_MEM2PER (0x1 << 4) |
122 | #define AT_XDMAC_CC_PROT (0x1 << 5) /* Channel Protection */ |
123 | #define AT_XDMAC_CC_PROT_SEC (0x0 << 5) |
124 | #define AT_XDMAC_CC_PROT_UNSEC (0x1 << 5) |
125 | #define AT_XDMAC_CC_SWREQ (0x1 << 6) /* Channel Software Request Trigger */ |
126 | #define AT_XDMAC_CC_SWREQ_HWR_CONNECTED (0x0 << 6) |
127 | #define AT_XDMAC_CC_SWREQ_SWR_CONNECTED (0x1 << 6) |
128 | #define AT_XDMAC_CC_MEMSET (0x1 << 7) /* Channel Fill Block of memory */ |
129 | #define AT_XDMAC_CC_MEMSET_NORMAL_MODE (0x0 << 7) |
130 | #define AT_XDMAC_CC_MEMSET_HW_MODE (0x1 << 7) |
131 | #define AT_XDMAC_CC_CSIZE(i) ((0x7 & (i)) << 8) /* Channel Chunk Size */ |
132 | #define AT_XDMAC_CC_DWIDTH_OFFSET 11 |
133 | #define AT_XDMAC_CC_DWIDTH_MASK (0x3 << AT_XDMAC_CC_DWIDTH_OFFSET) |
134 | #define AT_XDMAC_CC_DWIDTH(i) ((0x3 & (i)) << AT_XDMAC_CC_DWIDTH_OFFSET) /* Channel Data Width */ |
135 | #define AT_XDMAC_CC_DWIDTH_BYTE 0x0 |
136 | #define AT_XDMAC_CC_DWIDTH_HALFWORD 0x1 |
137 | #define AT_XDMAC_CC_DWIDTH_WORD 0x2 |
138 | #define AT_XDMAC_CC_DWIDTH_DWORD 0x3 |
139 | #define AT_XDMAC_CC_SIF(i) ((0x1 & (i)) << 13) /* Channel Source Interface Identifier */ |
140 | #define AT_XDMAC_CC_DIF(i) ((0x1 & (i)) << 14) /* Channel Destination Interface Identifier */ |
141 | #define AT_XDMAC_CC_SAM_MASK (0x3 << 16) /* Channel Source Addressing Mode */ |
142 | #define AT_XDMAC_CC_SAM_FIXED_AM (0x0 << 16) |
143 | #define AT_XDMAC_CC_SAM_INCREMENTED_AM (0x1 << 16) |
144 | #define AT_XDMAC_CC_SAM_UBS_AM (0x2 << 16) |
145 | #define AT_XDMAC_CC_SAM_UBS_DS_AM (0x3 << 16) |
146 | #define AT_XDMAC_CC_DAM_MASK (0x3 << 18) /* Channel Source Addressing Mode */ |
147 | #define AT_XDMAC_CC_DAM_FIXED_AM (0x0 << 18) |
148 | #define AT_XDMAC_CC_DAM_INCREMENTED_AM (0x1 << 18) |
149 | #define AT_XDMAC_CC_DAM_UBS_AM (0x2 << 18) |
150 | #define AT_XDMAC_CC_DAM_UBS_DS_AM (0x3 << 18) |
151 | #define AT_XDMAC_CC_INITD (0x1 << 21) /* Channel Initialization Terminated (read only) */ |
152 | #define AT_XDMAC_CC_INITD_TERMINATED (0x0 << 21) |
153 | #define AT_XDMAC_CC_INITD_IN_PROGRESS (0x1 << 21) |
154 | #define AT_XDMAC_CC_RDIP (0x1 << 22) /* Read in Progress (read only) */ |
155 | #define AT_XDMAC_CC_RDIP_DONE (0x0 << 22) |
156 | #define AT_XDMAC_CC_RDIP_IN_PROGRESS (0x1 << 22) |
157 | #define AT_XDMAC_CC_WRIP (0x1 << 23) /* Write in Progress (read only) */ |
158 | #define AT_XDMAC_CC_WRIP_DONE (0x0 << 23) |
159 | #define AT_XDMAC_CC_WRIP_IN_PROGRESS (0x1 << 23) |
160 | #define AT_XDMAC_CC_PERID(i) ((0x7f & (i)) << 24) /* Channel Peripheral Identifier */ |
161 | #define AT_XDMAC_CDS_MSP 0x2C /* Channel Data Stride Memory Set Pattern */ |
162 | #define AT_XDMAC_CSUS 0x30 /* Channel Source Microblock Stride */ |
163 | #define AT_XDMAC_CDUS 0x34 /* Channel Destination Microblock Stride */ |
164 | |
165 | /* Microblock control members */ |
166 | #define AT_XDMAC_MBR_UBC_UBLEN_MAX 0xFFFFFFUL /* Maximum Microblock Length */ |
167 | #define AT_XDMAC_MBR_UBC_NDE (0x1 << 24) /* Next Descriptor Enable */ |
168 | #define AT_XDMAC_MBR_UBC_NSEN (0x1 << 25) /* Next Descriptor Source Update */ |
169 | #define AT_XDMAC_MBR_UBC_NDEN (0x1 << 26) /* Next Descriptor Destination Update */ |
170 | #define AT_XDMAC_MBR_UBC_NDV0 (0x0 << 27) /* Next Descriptor View 0 */ |
171 | #define AT_XDMAC_MBR_UBC_NDV1 (0x1 << 27) /* Next Descriptor View 1 */ |
172 | #define AT_XDMAC_MBR_UBC_NDV2 (0x2 << 27) /* Next Descriptor View 2 */ |
173 | #define AT_XDMAC_MBR_UBC_NDV3 (0x3 << 27) /* Next Descriptor View 3 */ |
174 | |
175 | #define AT_XDMAC_MAX_CHAN 0x20 |
176 | #define AT_XDMAC_MAX_CSIZE 16 /* 16 data */ |
177 | #define AT_XDMAC_MAX_DWIDTH 8 /* 64 bits */ |
178 | #define AT_XDMAC_RESIDUE_MAX_RETRIES 5 |
179 | |
180 | #define AT_XDMAC_DMA_BUSWIDTHS\ |
181 | (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) |\ |
182 | BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |\ |
183 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |\ |
184 | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |\ |
185 | BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) |
186 | |
187 | enum atc_status { |
188 | AT_XDMAC_CHAN_IS_CYCLIC = 0, |
189 | AT_XDMAC_CHAN_IS_PAUSED, |
190 | AT_XDMAC_CHAN_IS_PAUSED_INTERNAL, |
191 | }; |
192 | |
193 | struct at_xdmac_layout { |
194 | /* Global Channel Read Suspend Register */ |
195 | u8 grs; |
196 | /* Global Write Suspend Register */ |
197 | u8 gws; |
198 | /* Global Channel Read Write Suspend Register */ |
199 | u8 grws; |
200 | /* Global Channel Read Write Resume Register */ |
201 | u8 grwr; |
202 | /* Global Channel Software Request Register */ |
203 | u8 gswr; |
204 | /* Global channel Software Request Status Register */ |
205 | u8 gsws; |
206 | /* Global Channel Software Flush Request Register */ |
207 | u8 gswf; |
208 | /* Channel reg base */ |
209 | u8 chan_cc_reg_base; |
210 | /* Source/Destination Interface must be specified or not */ |
211 | bool sdif; |
212 | /* AXI queue priority configuration supported */ |
213 | bool axi_config; |
214 | }; |
215 | |
216 | /* ----- Channels ----- */ |
217 | struct at_xdmac_chan { |
218 | struct dma_chan chan; |
219 | void __iomem *ch_regs; |
220 | u32 mask; /* Channel Mask */ |
221 | u32 cfg; /* Channel Configuration Register */ |
222 | u8 perid; /* Peripheral ID */ |
223 | u8 perif; /* Peripheral Interface */ |
224 | u8 memif; /* Memory Interface */ |
225 | u32 save_cc; |
226 | u32 save_cim; |
227 | u32 save_cnda; |
228 | u32 save_cndc; |
229 | u32 irq_status; |
230 | unsigned long status; |
231 | struct tasklet_struct tasklet; |
232 | struct dma_slave_config sconfig; |
233 | |
234 | spinlock_t lock; |
235 | |
236 | struct list_head xfers_list; |
237 | struct list_head free_descs_list; |
238 | }; |
239 | |
240 | |
241 | /* ----- Controller ----- */ |
242 | struct at_xdmac { |
243 | struct dma_device dma; |
244 | void __iomem *regs; |
245 | struct device *dev; |
246 | int irq; |
247 | struct clk *clk; |
248 | u32 save_gim; |
249 | u32 save_gs; |
250 | struct dma_pool *at_xdmac_desc_pool; |
251 | const struct at_xdmac_layout *layout; |
252 | struct at_xdmac_chan chan[]; |
253 | }; |
254 | |
255 | |
256 | /* ----- Descriptors ----- */ |
257 | |
258 | /* Linked List Descriptor */ |
259 | struct at_xdmac_lld { |
260 | u32 mbr_nda; /* Next Descriptor Member */ |
261 | u32 mbr_ubc; /* Microblock Control Member */ |
262 | u32 mbr_sa; /* Source Address Member */ |
263 | u32 mbr_da; /* Destination Address Member */ |
264 | u32 mbr_cfg; /* Configuration Register */ |
265 | u32 mbr_bc; /* Block Control Register */ |
266 | u32 mbr_ds; /* Data Stride Register */ |
267 | u32 mbr_sus; /* Source Microblock Stride Register */ |
268 | u32 mbr_dus; /* Destination Microblock Stride Register */ |
269 | }; |
270 | |
271 | /* 64-bit alignment needed to update CNDA and CUBC registers in an atomic way. */ |
272 | struct at_xdmac_desc { |
273 | struct at_xdmac_lld lld; |
274 | enum dma_transfer_direction direction; |
275 | struct dma_async_tx_descriptor tx_dma_desc; |
276 | struct list_head desc_node; |
277 | /* Following members are only used by the first descriptor */ |
278 | bool active_xfer; |
279 | unsigned int xfer_size; |
280 | struct list_head descs_list; |
281 | struct list_head xfer_node; |
282 | } __aligned(sizeof(u64)); |
283 | |
284 | static const struct at_xdmac_layout at_xdmac_sama5d4_layout = { |
285 | .grs = 0x28, |
286 | .gws = 0x2C, |
287 | .grws = 0x30, |
288 | .grwr = 0x34, |
289 | .gswr = 0x38, |
290 | .gsws = 0x3C, |
291 | .gswf = 0x40, |
292 | .chan_cc_reg_base = 0x50, |
293 | .sdif = true, |
294 | .axi_config = false, |
295 | }; |
296 | |
297 | static const struct at_xdmac_layout at_xdmac_sama7g5_layout = { |
298 | .grs = 0x30, |
299 | .gws = 0x38, |
300 | .grws = 0x40, |
301 | .grwr = 0x44, |
302 | .gswr = 0x48, |
303 | .gsws = 0x4C, |
304 | .gswf = 0x50, |
305 | .chan_cc_reg_base = 0x60, |
306 | .sdif = false, |
307 | .axi_config = true, |
308 | }; |
309 | |
310 | static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb) |
311 | { |
312 | return atxdmac->regs + (atxdmac->layout->chan_cc_reg_base + chan_nb * 0x40); |
313 | } |
314 | |
315 | #define at_xdmac_read(atxdmac, reg) readl_relaxed((atxdmac)->regs + (reg)) |
316 | #define at_xdmac_write(atxdmac, reg, value) \ |
317 | writel_relaxed((value), (atxdmac)->regs + (reg)) |
318 | |
319 | #define at_xdmac_chan_read(atchan, reg) readl_relaxed((atchan)->ch_regs + (reg)) |
320 | #define at_xdmac_chan_write(atchan, reg, value) writel_relaxed((value), (atchan)->ch_regs + (reg)) |
321 | |
322 | static inline struct at_xdmac_chan *to_at_xdmac_chan(struct dma_chan *dchan) |
323 | { |
324 | return container_of(dchan, struct at_xdmac_chan, chan); |
325 | } |
326 | |
327 | static struct device *chan2dev(struct dma_chan *chan) |
328 | { |
329 | return &chan->dev->device; |
330 | } |
331 | |
332 | static inline struct at_xdmac *to_at_xdmac(struct dma_device *ddev) |
333 | { |
334 | return container_of(ddev, struct at_xdmac, dma); |
335 | } |
336 | |
337 | static inline struct at_xdmac_desc *txd_to_at_desc(struct dma_async_tx_descriptor *txd) |
338 | { |
339 | return container_of(txd, struct at_xdmac_desc, tx_dma_desc); |
340 | } |
341 | |
342 | static inline int at_xdmac_chan_is_cyclic(struct at_xdmac_chan *atchan) |
343 | { |
344 | return test_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status); |
345 | } |
346 | |
347 | static inline int at_xdmac_chan_is_paused(struct at_xdmac_chan *atchan) |
348 | { |
349 | return test_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status); |
350 | } |
351 | |
352 | static inline int at_xdmac_chan_is_paused_internal(struct at_xdmac_chan *atchan) |
353 | { |
354 | return test_bit(AT_XDMAC_CHAN_IS_PAUSED_INTERNAL, &atchan->status); |
355 | } |
356 | |
357 | static inline bool at_xdmac_chan_is_peripheral_xfer(u32 cfg) |
358 | { |
359 | return cfg & AT_XDMAC_CC_TYPE_PER_TRAN; |
360 | } |
361 | |
362 | static inline u8 at_xdmac_get_dwidth(u32 cfg) |
363 | { |
364 | return (cfg & AT_XDMAC_CC_DWIDTH_MASK) >> AT_XDMAC_CC_DWIDTH_OFFSET; |
365 | }; |
366 | |
367 | static unsigned int init_nr_desc_per_channel = 64; |
368 | module_param(init_nr_desc_per_channel, uint, 0644); |
369 | MODULE_PARM_DESC(init_nr_desc_per_channel, |
370 | "initial descriptors per channel (default: 64)" ); |
371 | |
372 | |
373 | static void at_xdmac_runtime_suspend_descriptors(struct at_xdmac_chan *atchan) |
374 | { |
375 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
376 | struct at_xdmac_desc *desc, *_desc; |
377 | |
378 | list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node) { |
379 | if (!desc->active_xfer) |
380 | continue; |
381 | |
382 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
383 | pm_runtime_put_autosuspend(dev: atxdmac->dev); |
384 | } |
385 | } |
386 | |
387 | static int at_xdmac_runtime_resume_descriptors(struct at_xdmac_chan *atchan) |
388 | { |
389 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
390 | struct at_xdmac_desc *desc, *_desc; |
391 | int ret; |
392 | |
393 | list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node) { |
394 | if (!desc->active_xfer) |
395 | continue; |
396 | |
397 | ret = pm_runtime_resume_and_get(dev: atxdmac->dev); |
398 | if (ret < 0) |
399 | return ret; |
400 | } |
401 | |
402 | return 0; |
403 | } |
404 | |
405 | static bool at_xdmac_chan_is_enabled(struct at_xdmac_chan *atchan) |
406 | { |
407 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
408 | int ret; |
409 | |
410 | ret = pm_runtime_resume_and_get(dev: atxdmac->dev); |
411 | if (ret < 0) |
412 | return false; |
413 | |
414 | ret = !!(at_xdmac_chan_read(atchan, AT_XDMAC_GS) & atchan->mask); |
415 | |
416 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
417 | pm_runtime_put_autosuspend(dev: atxdmac->dev); |
418 | |
419 | return ret; |
420 | } |
421 | |
422 | static void at_xdmac_off(struct at_xdmac *atxdmac, bool suspend_descriptors) |
423 | { |
424 | struct dma_chan *chan, *_chan; |
425 | struct at_xdmac_chan *atchan; |
426 | int ret; |
427 | |
428 | ret = pm_runtime_resume_and_get(dev: atxdmac->dev); |
429 | if (ret < 0) |
430 | return; |
431 | |
432 | at_xdmac_write(atxdmac, AT_XDMAC_GD, -1L); |
433 | |
434 | /* Wait that all chans are disabled. */ |
435 | while (at_xdmac_read(atxdmac, AT_XDMAC_GS)) |
436 | cpu_relax(); |
437 | |
438 | at_xdmac_write(atxdmac, AT_XDMAC_GID, -1L); |
439 | |
440 | /* Decrement runtime PM ref counter for each active descriptor. */ |
441 | if (!list_empty(head: &atxdmac->dma.channels) && suspend_descriptors) { |
442 | list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, |
443 | device_node) { |
444 | atchan = to_at_xdmac_chan(dchan: chan); |
445 | at_xdmac_runtime_suspend_descriptors(atchan); |
446 | } |
447 | } |
448 | |
449 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
450 | pm_runtime_put_autosuspend(dev: atxdmac->dev); |
451 | } |
452 | |
453 | /* Call with lock hold. */ |
454 | static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan, |
455 | struct at_xdmac_desc *first) |
456 | { |
457 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
458 | u32 reg; |
459 | int ret; |
460 | |
461 | ret = pm_runtime_resume_and_get(dev: atxdmac->dev); |
462 | if (ret < 0) |
463 | return; |
464 | |
465 | dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n" , __func__, first); |
466 | |
467 | /* Set transfer as active to not try to start it again. */ |
468 | first->active_xfer = true; |
469 | |
470 | /* Tell xdmac where to get the first descriptor. */ |
471 | reg = AT_XDMAC_CNDA_NDA(first->tx_dma_desc.phys); |
472 | if (atxdmac->layout->sdif) |
473 | reg |= AT_XDMAC_CNDA_NDAIF(atchan->memif); |
474 | |
475 | at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, reg); |
476 | |
477 | /* |
478 | * When doing non cyclic transfer we need to use the next |
479 | * descriptor view 2 since some fields of the configuration register |
480 | * depend on transfer size and src/dest addresses. |
481 | */ |
482 | if (at_xdmac_chan_is_cyclic(atchan)) |
483 | reg = AT_XDMAC_CNDC_NDVIEW_NDV1; |
484 | else if ((first->lld.mbr_ubc & |
485 | AT_XDMAC_CNDC_NDVIEW_MASK) == AT_XDMAC_MBR_UBC_NDV3) |
486 | reg = AT_XDMAC_CNDC_NDVIEW_NDV3; |
487 | else |
488 | reg = AT_XDMAC_CNDC_NDVIEW_NDV2; |
489 | /* |
490 | * Even if the register will be updated from the configuration in the |
491 | * descriptor when using view 2 or higher, the PROT bit won't be set |
492 | * properly. This bit can be modified only by using the channel |
493 | * configuration register. |
494 | */ |
495 | at_xdmac_chan_write(atchan, AT_XDMAC_CC, first->lld.mbr_cfg); |
496 | |
497 | reg |= AT_XDMAC_CNDC_NDDUP |
498 | | AT_XDMAC_CNDC_NDSUP |
499 | | AT_XDMAC_CNDC_NDE; |
500 | at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, reg); |
501 | |
502 | dev_vdbg(chan2dev(&atchan->chan), |
503 | "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n" , |
504 | __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC), |
505 | at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), |
506 | at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), |
507 | at_xdmac_chan_read(atchan, AT_XDMAC_CSA), |
508 | at_xdmac_chan_read(atchan, AT_XDMAC_CDA), |
509 | at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); |
510 | |
511 | at_xdmac_chan_write(atchan, AT_XDMAC_CID, 0xffffffff); |
512 | reg = AT_XDMAC_CIE_RBEIE | AT_XDMAC_CIE_WBEIE; |
513 | /* |
514 | * Request Overflow Error is only for peripheral synchronized transfers |
515 | */ |
516 | if (at_xdmac_chan_is_peripheral_xfer(cfg: first->lld.mbr_cfg)) |
517 | reg |= AT_XDMAC_CIE_ROIE; |
518 | |
519 | /* |
520 | * There is no end of list when doing cyclic dma, we need to get |
521 | * an interrupt after each periods. |
522 | */ |
523 | if (at_xdmac_chan_is_cyclic(atchan)) |
524 | at_xdmac_chan_write(atchan, AT_XDMAC_CIE, |
525 | reg | AT_XDMAC_CIE_BIE); |
526 | else |
527 | at_xdmac_chan_write(atchan, AT_XDMAC_CIE, |
528 | reg | AT_XDMAC_CIE_LIE); |
529 | at_xdmac_write(atxdmac, AT_XDMAC_GIE, atchan->mask); |
530 | dev_vdbg(chan2dev(&atchan->chan), |
531 | "%s: enable channel (0x%08x)\n" , __func__, atchan->mask); |
532 | wmb(); |
533 | at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask); |
534 | |
535 | dev_vdbg(chan2dev(&atchan->chan), |
536 | "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n" , |
537 | __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC), |
538 | at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), |
539 | at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), |
540 | at_xdmac_chan_read(atchan, AT_XDMAC_CSA), |
541 | at_xdmac_chan_read(atchan, AT_XDMAC_CDA), |
542 | at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); |
543 | } |
544 | |
545 | static dma_cookie_t at_xdmac_tx_submit(struct dma_async_tx_descriptor *tx) |
546 | { |
547 | struct at_xdmac_desc *desc = txd_to_at_desc(txd: tx); |
548 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: tx->chan); |
549 | dma_cookie_t cookie; |
550 | unsigned long irqflags; |
551 | |
552 | spin_lock_irqsave(&atchan->lock, irqflags); |
553 | cookie = dma_cookie_assign(tx); |
554 | |
555 | list_add_tail(new: &desc->xfer_node, head: &atchan->xfers_list); |
556 | spin_unlock_irqrestore(lock: &atchan->lock, flags: irqflags); |
557 | |
558 | dev_vdbg(chan2dev(tx->chan), "%s: atchan 0x%p, add desc 0x%p to xfers_list\n" , |
559 | __func__, atchan, desc); |
560 | |
561 | return cookie; |
562 | } |
563 | |
564 | static struct at_xdmac_desc *at_xdmac_alloc_desc(struct dma_chan *chan, |
565 | gfp_t gfp_flags) |
566 | { |
567 | struct at_xdmac_desc *desc; |
568 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: chan->device); |
569 | dma_addr_t phys; |
570 | |
571 | desc = dma_pool_zalloc(pool: atxdmac->at_xdmac_desc_pool, mem_flags: gfp_flags, handle: &phys); |
572 | if (desc) { |
573 | INIT_LIST_HEAD(list: &desc->descs_list); |
574 | dma_async_tx_descriptor_init(tx: &desc->tx_dma_desc, chan); |
575 | desc->tx_dma_desc.tx_submit = at_xdmac_tx_submit; |
576 | desc->tx_dma_desc.phys = phys; |
577 | } |
578 | |
579 | return desc; |
580 | } |
581 | |
582 | static void at_xdmac_init_used_desc(struct at_xdmac_desc *desc) |
583 | { |
584 | memset(&desc->lld, 0, sizeof(desc->lld)); |
585 | INIT_LIST_HEAD(list: &desc->descs_list); |
586 | desc->direction = DMA_TRANS_NONE; |
587 | desc->xfer_size = 0; |
588 | desc->active_xfer = false; |
589 | } |
590 | |
591 | /* Call must be protected by lock. */ |
592 | static struct at_xdmac_desc *at_xdmac_get_desc(struct at_xdmac_chan *atchan) |
593 | { |
594 | struct at_xdmac_desc *desc; |
595 | |
596 | if (list_empty(head: &atchan->free_descs_list)) { |
597 | desc = at_xdmac_alloc_desc(chan: &atchan->chan, GFP_NOWAIT); |
598 | } else { |
599 | desc = list_first_entry(&atchan->free_descs_list, |
600 | struct at_xdmac_desc, desc_node); |
601 | list_del(entry: &desc->desc_node); |
602 | at_xdmac_init_used_desc(desc); |
603 | } |
604 | |
605 | return desc; |
606 | } |
607 | |
608 | static void at_xdmac_queue_desc(struct dma_chan *chan, |
609 | struct at_xdmac_desc *prev, |
610 | struct at_xdmac_desc *desc) |
611 | { |
612 | if (!prev || !desc) |
613 | return; |
614 | |
615 | prev->lld.mbr_nda = desc->tx_dma_desc.phys; |
616 | prev->lld.mbr_ubc |= AT_XDMAC_MBR_UBC_NDE; |
617 | |
618 | dev_dbg(chan2dev(chan), "%s: chain lld: prev=0x%p, mbr_nda=%pad\n" , |
619 | __func__, prev, &prev->lld.mbr_nda); |
620 | } |
621 | |
622 | static inline void at_xdmac_increment_block_count(struct dma_chan *chan, |
623 | struct at_xdmac_desc *desc) |
624 | { |
625 | if (!desc) |
626 | return; |
627 | |
628 | desc->lld.mbr_bc++; |
629 | |
630 | dev_dbg(chan2dev(chan), |
631 | "%s: incrementing the block count of the desc 0x%p\n" , |
632 | __func__, desc); |
633 | } |
634 | |
635 | static struct dma_chan *at_xdmac_xlate(struct of_phandle_args *dma_spec, |
636 | struct of_dma *of_dma) |
637 | { |
638 | struct at_xdmac *atxdmac = of_dma->of_dma_data; |
639 | struct at_xdmac_chan *atchan; |
640 | struct dma_chan *chan; |
641 | struct device *dev = atxdmac->dma.dev; |
642 | |
643 | if (dma_spec->args_count != 1) { |
644 | dev_err(dev, "dma phandler args: bad number of args\n" ); |
645 | return NULL; |
646 | } |
647 | |
648 | chan = dma_get_any_slave_channel(device: &atxdmac->dma); |
649 | if (!chan) { |
650 | dev_err(dev, "can't get a dma channel\n" ); |
651 | return NULL; |
652 | } |
653 | |
654 | atchan = to_at_xdmac_chan(dchan: chan); |
655 | atchan->memif = AT91_XDMAC_DT_GET_MEM_IF(dma_spec->args[0]); |
656 | atchan->perif = AT91_XDMAC_DT_GET_PER_IF(dma_spec->args[0]); |
657 | atchan->perid = AT91_XDMAC_DT_GET_PERID(dma_spec->args[0]); |
658 | dev_dbg(dev, "chan dt cfg: memif=%u perif=%u perid=%u\n" , |
659 | atchan->memif, atchan->perif, atchan->perid); |
660 | |
661 | return chan; |
662 | } |
663 | |
664 | static int at_xdmac_compute_chan_conf(struct dma_chan *chan, |
665 | enum dma_transfer_direction direction) |
666 | { |
667 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
668 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
669 | int csize, dwidth; |
670 | |
671 | if (direction == DMA_DEV_TO_MEM) { |
672 | atchan->cfg = |
673 | AT91_XDMAC_DT_PERID(atchan->perid) |
674 | | AT_XDMAC_CC_DAM_INCREMENTED_AM |
675 | | AT_XDMAC_CC_SAM_FIXED_AM |
676 | | AT_XDMAC_CC_SWREQ_HWR_CONNECTED |
677 | | AT_XDMAC_CC_DSYNC_PER2MEM |
678 | | AT_XDMAC_CC_MBSIZE_SIXTEEN |
679 | | AT_XDMAC_CC_TYPE_PER_TRAN; |
680 | if (atxdmac->layout->sdif) |
681 | atchan->cfg |= AT_XDMAC_CC_DIF(atchan->memif) | |
682 | AT_XDMAC_CC_SIF(atchan->perif); |
683 | |
684 | csize = ffs(atchan->sconfig.src_maxburst) - 1; |
685 | if (csize < 0) { |
686 | dev_err(chan2dev(chan), "invalid src maxburst value\n" ); |
687 | return -EINVAL; |
688 | } |
689 | atchan->cfg |= AT_XDMAC_CC_CSIZE(csize); |
690 | dwidth = ffs(atchan->sconfig.src_addr_width) - 1; |
691 | if (dwidth < 0) { |
692 | dev_err(chan2dev(chan), "invalid src addr width value\n" ); |
693 | return -EINVAL; |
694 | } |
695 | atchan->cfg |= AT_XDMAC_CC_DWIDTH(dwidth); |
696 | } else if (direction == DMA_MEM_TO_DEV) { |
697 | atchan->cfg = |
698 | AT91_XDMAC_DT_PERID(atchan->perid) |
699 | | AT_XDMAC_CC_DAM_FIXED_AM |
700 | | AT_XDMAC_CC_SAM_INCREMENTED_AM |
701 | | AT_XDMAC_CC_SWREQ_HWR_CONNECTED |
702 | | AT_XDMAC_CC_DSYNC_MEM2PER |
703 | | AT_XDMAC_CC_MBSIZE_SIXTEEN |
704 | | AT_XDMAC_CC_TYPE_PER_TRAN; |
705 | if (atxdmac->layout->sdif) |
706 | atchan->cfg |= AT_XDMAC_CC_DIF(atchan->perif) | |
707 | AT_XDMAC_CC_SIF(atchan->memif); |
708 | |
709 | csize = ffs(atchan->sconfig.dst_maxburst) - 1; |
710 | if (csize < 0) { |
711 | dev_err(chan2dev(chan), "invalid src maxburst value\n" ); |
712 | return -EINVAL; |
713 | } |
714 | atchan->cfg |= AT_XDMAC_CC_CSIZE(csize); |
715 | dwidth = ffs(atchan->sconfig.dst_addr_width) - 1; |
716 | if (dwidth < 0) { |
717 | dev_err(chan2dev(chan), "invalid dst addr width value\n" ); |
718 | return -EINVAL; |
719 | } |
720 | atchan->cfg |= AT_XDMAC_CC_DWIDTH(dwidth); |
721 | } |
722 | |
723 | dev_dbg(chan2dev(chan), "%s: cfg=0x%08x\n" , __func__, atchan->cfg); |
724 | |
725 | return 0; |
726 | } |
727 | |
728 | /* |
729 | * Only check that maxburst and addr width values are supported by |
730 | * the controller but not that the configuration is good to perform the |
731 | * transfer since we don't know the direction at this stage. |
732 | */ |
733 | static int at_xdmac_check_slave_config(struct dma_slave_config *sconfig) |
734 | { |
735 | if ((sconfig->src_maxburst > AT_XDMAC_MAX_CSIZE) |
736 | || (sconfig->dst_maxburst > AT_XDMAC_MAX_CSIZE)) |
737 | return -EINVAL; |
738 | |
739 | if ((sconfig->src_addr_width > AT_XDMAC_MAX_DWIDTH) |
740 | || (sconfig->dst_addr_width > AT_XDMAC_MAX_DWIDTH)) |
741 | return -EINVAL; |
742 | |
743 | return 0; |
744 | } |
745 | |
746 | static int at_xdmac_set_slave_config(struct dma_chan *chan, |
747 | struct dma_slave_config *sconfig) |
748 | { |
749 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
750 | |
751 | if (at_xdmac_check_slave_config(sconfig)) { |
752 | dev_err(chan2dev(chan), "invalid slave configuration\n" ); |
753 | return -EINVAL; |
754 | } |
755 | |
756 | memcpy(&atchan->sconfig, sconfig, sizeof(atchan->sconfig)); |
757 | |
758 | return 0; |
759 | } |
760 | |
761 | static struct dma_async_tx_descriptor * |
762 | at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, |
763 | unsigned int sg_len, enum dma_transfer_direction direction, |
764 | unsigned long flags, void *context) |
765 | { |
766 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
767 | struct at_xdmac_desc *first = NULL, *prev = NULL; |
768 | struct scatterlist *sg; |
769 | int i; |
770 | unsigned int xfer_size = 0; |
771 | unsigned long irqflags; |
772 | struct dma_async_tx_descriptor *ret = NULL; |
773 | |
774 | if (!sgl) |
775 | return NULL; |
776 | |
777 | if (!is_slave_direction(direction)) { |
778 | dev_err(chan2dev(chan), "invalid DMA direction\n" ); |
779 | return NULL; |
780 | } |
781 | |
782 | dev_dbg(chan2dev(chan), "%s: sg_len=%d, dir=%s, flags=0x%lx\n" , |
783 | __func__, sg_len, |
784 | direction == DMA_MEM_TO_DEV ? "to device" : "from device" , |
785 | flags); |
786 | |
787 | /* Protect dma_sconfig field that can be modified by set_slave_conf. */ |
788 | spin_lock_irqsave(&atchan->lock, irqflags); |
789 | |
790 | if (at_xdmac_compute_chan_conf(chan, direction)) |
791 | goto spin_unlock; |
792 | |
793 | /* Prepare descriptors. */ |
794 | for_each_sg(sgl, sg, sg_len, i) { |
795 | struct at_xdmac_desc *desc = NULL; |
796 | u32 len, mem, dwidth, fixed_dwidth; |
797 | |
798 | len = sg_dma_len(sg); |
799 | mem = sg_dma_address(sg); |
800 | if (unlikely(!len)) { |
801 | dev_err(chan2dev(chan), "sg data length is zero\n" ); |
802 | goto spin_unlock; |
803 | } |
804 | dev_dbg(chan2dev(chan), "%s: * sg%d len=%u, mem=0x%08x\n" , |
805 | __func__, i, len, mem); |
806 | |
807 | desc = at_xdmac_get_desc(atchan); |
808 | if (!desc) { |
809 | dev_err(chan2dev(chan), "can't get descriptor\n" ); |
810 | if (first) |
811 | list_splice_tail_init(list: &first->descs_list, |
812 | head: &atchan->free_descs_list); |
813 | goto spin_unlock; |
814 | } |
815 | |
816 | /* Linked list descriptor setup. */ |
817 | if (direction == DMA_DEV_TO_MEM) { |
818 | desc->lld.mbr_sa = atchan->sconfig.src_addr; |
819 | desc->lld.mbr_da = mem; |
820 | } else { |
821 | desc->lld.mbr_sa = mem; |
822 | desc->lld.mbr_da = atchan->sconfig.dst_addr; |
823 | } |
824 | dwidth = at_xdmac_get_dwidth(cfg: atchan->cfg); |
825 | fixed_dwidth = IS_ALIGNED(len, 1 << dwidth) |
826 | ? dwidth |
827 | : AT_XDMAC_CC_DWIDTH_BYTE; |
828 | desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2 /* next descriptor view */ |
829 | | AT_XDMAC_MBR_UBC_NDEN /* next descriptor dst parameter update */ |
830 | | AT_XDMAC_MBR_UBC_NSEN /* next descriptor src parameter update */ |
831 | | (len >> fixed_dwidth); /* microblock length */ |
832 | desc->lld.mbr_cfg = (atchan->cfg & ~AT_XDMAC_CC_DWIDTH_MASK) | |
833 | AT_XDMAC_CC_DWIDTH(fixed_dwidth); |
834 | dev_dbg(chan2dev(chan), |
835 | "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n" , |
836 | __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc); |
837 | |
838 | /* Chain lld. */ |
839 | if (prev) |
840 | at_xdmac_queue_desc(chan, prev, desc); |
841 | |
842 | prev = desc; |
843 | if (!first) |
844 | first = desc; |
845 | |
846 | dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n" , |
847 | __func__, desc, first); |
848 | list_add_tail(new: &desc->desc_node, head: &first->descs_list); |
849 | xfer_size += len; |
850 | } |
851 | |
852 | |
853 | first->tx_dma_desc.flags = flags; |
854 | first->xfer_size = xfer_size; |
855 | first->direction = direction; |
856 | ret = &first->tx_dma_desc; |
857 | |
858 | spin_unlock: |
859 | spin_unlock_irqrestore(lock: &atchan->lock, flags: irqflags); |
860 | return ret; |
861 | } |
862 | |
863 | static struct dma_async_tx_descriptor * |
864 | at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, |
865 | size_t buf_len, size_t period_len, |
866 | enum dma_transfer_direction direction, |
867 | unsigned long flags) |
868 | { |
869 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
870 | struct at_xdmac_desc *first = NULL, *prev = NULL; |
871 | unsigned int periods = buf_len / period_len; |
872 | int i; |
873 | unsigned long irqflags; |
874 | |
875 | dev_dbg(chan2dev(chan), "%s: buf_addr=%pad, buf_len=%zd, period_len=%zd, dir=%s, flags=0x%lx\n" , |
876 | __func__, &buf_addr, buf_len, period_len, |
877 | direction == DMA_MEM_TO_DEV ? "mem2per" : "per2mem" , flags); |
878 | |
879 | if (!is_slave_direction(direction)) { |
880 | dev_err(chan2dev(chan), "invalid DMA direction\n" ); |
881 | return NULL; |
882 | } |
883 | |
884 | if (test_and_set_bit(nr: AT_XDMAC_CHAN_IS_CYCLIC, addr: &atchan->status)) { |
885 | dev_err(chan2dev(chan), "channel currently used\n" ); |
886 | return NULL; |
887 | } |
888 | |
889 | if (at_xdmac_compute_chan_conf(chan, direction)) |
890 | return NULL; |
891 | |
892 | for (i = 0; i < periods; i++) { |
893 | struct at_xdmac_desc *desc = NULL; |
894 | |
895 | spin_lock_irqsave(&atchan->lock, irqflags); |
896 | desc = at_xdmac_get_desc(atchan); |
897 | if (!desc) { |
898 | dev_err(chan2dev(chan), "can't get descriptor\n" ); |
899 | if (first) |
900 | list_splice_tail_init(list: &first->descs_list, |
901 | head: &atchan->free_descs_list); |
902 | spin_unlock_irqrestore(lock: &atchan->lock, flags: irqflags); |
903 | return NULL; |
904 | } |
905 | spin_unlock_irqrestore(lock: &atchan->lock, flags: irqflags); |
906 | dev_dbg(chan2dev(chan), |
907 | "%s: desc=0x%p, tx_dma_desc.phys=%pad\n" , |
908 | __func__, desc, &desc->tx_dma_desc.phys); |
909 | |
910 | if (direction == DMA_DEV_TO_MEM) { |
911 | desc->lld.mbr_sa = atchan->sconfig.src_addr; |
912 | desc->lld.mbr_da = buf_addr + i * period_len; |
913 | } else { |
914 | desc->lld.mbr_sa = buf_addr + i * period_len; |
915 | desc->lld.mbr_da = atchan->sconfig.dst_addr; |
916 | } |
917 | desc->lld.mbr_cfg = atchan->cfg; |
918 | desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1 |
919 | | AT_XDMAC_MBR_UBC_NDEN |
920 | | AT_XDMAC_MBR_UBC_NSEN |
921 | | period_len >> at_xdmac_get_dwidth(cfg: desc->lld.mbr_cfg); |
922 | |
923 | dev_dbg(chan2dev(chan), |
924 | "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n" , |
925 | __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc); |
926 | |
927 | /* Chain lld. */ |
928 | if (prev) |
929 | at_xdmac_queue_desc(chan, prev, desc); |
930 | |
931 | prev = desc; |
932 | if (!first) |
933 | first = desc; |
934 | |
935 | dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n" , |
936 | __func__, desc, first); |
937 | list_add_tail(new: &desc->desc_node, head: &first->descs_list); |
938 | } |
939 | |
940 | at_xdmac_queue_desc(chan, prev, desc: first); |
941 | first->tx_dma_desc.flags = flags; |
942 | first->xfer_size = buf_len; |
943 | first->direction = direction; |
944 | |
945 | return &first->tx_dma_desc; |
946 | } |
947 | |
948 | static inline u32 at_xdmac_align_width(struct dma_chan *chan, dma_addr_t addr) |
949 | { |
950 | u32 width; |
951 | |
952 | /* |
953 | * Check address alignment to select the greater data width we |
954 | * can use. |
955 | * |
956 | * Some XDMAC implementations don't provide dword transfer, in |
957 | * this case selecting dword has the same behavior as |
958 | * selecting word transfers. |
959 | */ |
960 | if (!(addr & 7)) { |
961 | width = AT_XDMAC_CC_DWIDTH_DWORD; |
962 | dev_dbg(chan2dev(chan), "%s: dwidth: double word\n" , __func__); |
963 | } else if (!(addr & 3)) { |
964 | width = AT_XDMAC_CC_DWIDTH_WORD; |
965 | dev_dbg(chan2dev(chan), "%s: dwidth: word\n" , __func__); |
966 | } else if (!(addr & 1)) { |
967 | width = AT_XDMAC_CC_DWIDTH_HALFWORD; |
968 | dev_dbg(chan2dev(chan), "%s: dwidth: half word\n" , __func__); |
969 | } else { |
970 | width = AT_XDMAC_CC_DWIDTH_BYTE; |
971 | dev_dbg(chan2dev(chan), "%s: dwidth: byte\n" , __func__); |
972 | } |
973 | |
974 | return width; |
975 | } |
976 | |
977 | static struct at_xdmac_desc * |
978 | at_xdmac_interleaved_queue_desc(struct dma_chan *chan, |
979 | struct at_xdmac_chan *atchan, |
980 | struct at_xdmac_desc *prev, |
981 | dma_addr_t src, dma_addr_t dst, |
982 | struct dma_interleaved_template *xt, |
983 | struct data_chunk *chunk) |
984 | { |
985 | struct at_xdmac_desc *desc; |
986 | u32 dwidth; |
987 | unsigned long flags; |
988 | size_t ublen; |
989 | /* |
990 | * WARNING: The channel configuration is set here since there is no |
991 | * dmaengine_slave_config call in this case. Moreover we don't know the |
992 | * direction, it involves we can't dynamically set the source and dest |
993 | * interface so we have to use the same one. Only interface 0 allows EBI |
994 | * access. Hopefully we can access DDR through both ports (at least on |
995 | * SAMA5D4x), so we can use the same interface for source and dest, |
996 | * that solves the fact we don't know the direction. |
997 | * ERRATA: Even if useless for memory transfers, the PERID has to not |
998 | * match the one of another channel. If not, it could lead to spurious |
999 | * flag status. |
1000 | * For SAMA7G5x case, the SIF and DIF fields are no longer used. |
1001 | * Thus, no need to have the SIF/DIF interfaces here. |
1002 | * For SAMA5D4x and SAMA5D2x the SIF and DIF are already configured as |
1003 | * zero. |
1004 | */ |
1005 | u32 chan_cc = AT_XDMAC_CC_PERID(0x7f) |
1006 | | AT_XDMAC_CC_MBSIZE_SIXTEEN |
1007 | | AT_XDMAC_CC_TYPE_MEM_TRAN; |
1008 | |
1009 | dwidth = at_xdmac_align_width(chan, addr: src | dst | chunk->size); |
1010 | if (chunk->size >= (AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)) { |
1011 | dev_dbg(chan2dev(chan), |
1012 | "%s: chunk too big (%zu, max size %lu)...\n" , |
1013 | __func__, chunk->size, |
1014 | AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth); |
1015 | return NULL; |
1016 | } |
1017 | |
1018 | if (prev) |
1019 | dev_dbg(chan2dev(chan), |
1020 | "Adding items at the end of desc 0x%p\n" , prev); |
1021 | |
1022 | if (xt->src_inc) { |
1023 | if (xt->src_sgl) |
1024 | chan_cc |= AT_XDMAC_CC_SAM_UBS_AM; |
1025 | else |
1026 | chan_cc |= AT_XDMAC_CC_SAM_INCREMENTED_AM; |
1027 | } |
1028 | |
1029 | if (xt->dst_inc) { |
1030 | if (xt->dst_sgl) |
1031 | chan_cc |= AT_XDMAC_CC_DAM_UBS_AM; |
1032 | else |
1033 | chan_cc |= AT_XDMAC_CC_DAM_INCREMENTED_AM; |
1034 | } |
1035 | |
1036 | spin_lock_irqsave(&atchan->lock, flags); |
1037 | desc = at_xdmac_get_desc(atchan); |
1038 | spin_unlock_irqrestore(lock: &atchan->lock, flags); |
1039 | if (!desc) { |
1040 | dev_err(chan2dev(chan), "can't get descriptor\n" ); |
1041 | return NULL; |
1042 | } |
1043 | |
1044 | chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth); |
1045 | |
1046 | ublen = chunk->size >> dwidth; |
1047 | |
1048 | desc->lld.mbr_sa = src; |
1049 | desc->lld.mbr_da = dst; |
1050 | desc->lld.mbr_sus = dmaengine_get_src_icg(xt, chunk); |
1051 | desc->lld.mbr_dus = dmaengine_get_dst_icg(xt, chunk); |
1052 | |
1053 | desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV3 |
1054 | | AT_XDMAC_MBR_UBC_NDEN |
1055 | | AT_XDMAC_MBR_UBC_NSEN |
1056 | | ublen; |
1057 | desc->lld.mbr_cfg = chan_cc; |
1058 | |
1059 | dev_dbg(chan2dev(chan), |
1060 | "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n" , |
1061 | __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, |
1062 | desc->lld.mbr_ubc, desc->lld.mbr_cfg); |
1063 | |
1064 | /* Chain lld. */ |
1065 | if (prev) |
1066 | at_xdmac_queue_desc(chan, prev, desc); |
1067 | |
1068 | return desc; |
1069 | } |
1070 | |
1071 | static struct dma_async_tx_descriptor * |
1072 | at_xdmac_prep_interleaved(struct dma_chan *chan, |
1073 | struct dma_interleaved_template *xt, |
1074 | unsigned long flags) |
1075 | { |
1076 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
1077 | struct at_xdmac_desc *prev = NULL, *first = NULL; |
1078 | dma_addr_t dst_addr, src_addr; |
1079 | size_t src_skip = 0, dst_skip = 0, len = 0; |
1080 | struct data_chunk *chunk; |
1081 | int i; |
1082 | |
1083 | if (!xt || !xt->numf || (xt->dir != DMA_MEM_TO_MEM)) |
1084 | return NULL; |
1085 | |
1086 | /* |
1087 | * TODO: Handle the case where we have to repeat a chain of |
1088 | * descriptors... |
1089 | */ |
1090 | if ((xt->numf > 1) && (xt->frame_size > 1)) |
1091 | return NULL; |
1092 | |
1093 | dev_dbg(chan2dev(chan), "%s: src=%pad, dest=%pad, numf=%zu, frame_size=%zu, flags=0x%lx\n" , |
1094 | __func__, &xt->src_start, &xt->dst_start, xt->numf, |
1095 | xt->frame_size, flags); |
1096 | |
1097 | src_addr = xt->src_start; |
1098 | dst_addr = xt->dst_start; |
1099 | |
1100 | if (xt->numf > 1) { |
1101 | first = at_xdmac_interleaved_queue_desc(chan, atchan, |
1102 | NULL, |
1103 | src: src_addr, dst: dst_addr, |
1104 | xt, chunk: xt->sgl); |
1105 | if (!first) |
1106 | return NULL; |
1107 | |
1108 | /* Length of the block is (BLEN+1) microblocks. */ |
1109 | for (i = 0; i < xt->numf - 1; i++) |
1110 | at_xdmac_increment_block_count(chan, desc: first); |
1111 | |
1112 | dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n" , |
1113 | __func__, first, first); |
1114 | list_add_tail(new: &first->desc_node, head: &first->descs_list); |
1115 | } else { |
1116 | for (i = 0; i < xt->frame_size; i++) { |
1117 | size_t src_icg = 0, dst_icg = 0; |
1118 | struct at_xdmac_desc *desc; |
1119 | |
1120 | chunk = xt->sgl + i; |
1121 | |
1122 | dst_icg = dmaengine_get_dst_icg(xt, chunk); |
1123 | src_icg = dmaengine_get_src_icg(xt, chunk); |
1124 | |
1125 | src_skip = chunk->size + src_icg; |
1126 | dst_skip = chunk->size + dst_icg; |
1127 | |
1128 | dev_dbg(chan2dev(chan), |
1129 | "%s: chunk size=%zu, src icg=%zu, dst icg=%zu\n" , |
1130 | __func__, chunk->size, src_icg, dst_icg); |
1131 | |
1132 | desc = at_xdmac_interleaved_queue_desc(chan, atchan, |
1133 | prev, |
1134 | src: src_addr, dst: dst_addr, |
1135 | xt, chunk); |
1136 | if (!desc) { |
1137 | if (first) |
1138 | list_splice_tail_init(list: &first->descs_list, |
1139 | head: &atchan->free_descs_list); |
1140 | return NULL; |
1141 | } |
1142 | |
1143 | if (!first) |
1144 | first = desc; |
1145 | |
1146 | dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n" , |
1147 | __func__, desc, first); |
1148 | list_add_tail(new: &desc->desc_node, head: &first->descs_list); |
1149 | |
1150 | if (xt->src_sgl) |
1151 | src_addr += src_skip; |
1152 | |
1153 | if (xt->dst_sgl) |
1154 | dst_addr += dst_skip; |
1155 | |
1156 | len += chunk->size; |
1157 | prev = desc; |
1158 | } |
1159 | } |
1160 | |
1161 | first->tx_dma_desc.cookie = -EBUSY; |
1162 | first->tx_dma_desc.flags = flags; |
1163 | first->xfer_size = len; |
1164 | |
1165 | return &first->tx_dma_desc; |
1166 | } |
1167 | |
1168 | static struct dma_async_tx_descriptor * |
1169 | at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, |
1170 | size_t len, unsigned long flags) |
1171 | { |
1172 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
1173 | struct at_xdmac_desc *first = NULL, *prev = NULL; |
1174 | size_t remaining_size = len, xfer_size = 0, ublen; |
1175 | dma_addr_t src_addr = src, dst_addr = dest; |
1176 | u32 dwidth; |
1177 | /* |
1178 | * WARNING: We don't know the direction, it involves we can't |
1179 | * dynamically set the source and dest interface so we have to use the |
1180 | * same one. Only interface 0 allows EBI access. Hopefully we can |
1181 | * access DDR through both ports (at least on SAMA5D4x), so we can use |
1182 | * the same interface for source and dest, that solves the fact we |
1183 | * don't know the direction. |
1184 | * ERRATA: Even if useless for memory transfers, the PERID has to not |
1185 | * match the one of another channel. If not, it could lead to spurious |
1186 | * flag status. |
1187 | * For SAMA7G5x case, the SIF and DIF fields are no longer used. |
1188 | * Thus, no need to have the SIF/DIF interfaces here. |
1189 | * For SAMA5D4x and SAMA5D2x the SIF and DIF are already configured as |
1190 | * zero. |
1191 | */ |
1192 | u32 chan_cc = AT_XDMAC_CC_PERID(0x7f) |
1193 | | AT_XDMAC_CC_DAM_INCREMENTED_AM |
1194 | | AT_XDMAC_CC_SAM_INCREMENTED_AM |
1195 | | AT_XDMAC_CC_MBSIZE_SIXTEEN |
1196 | | AT_XDMAC_CC_TYPE_MEM_TRAN; |
1197 | unsigned long irqflags; |
1198 | |
1199 | dev_dbg(chan2dev(chan), "%s: src=%pad, dest=%pad, len=%zd, flags=0x%lx\n" , |
1200 | __func__, &src, &dest, len, flags); |
1201 | |
1202 | if (unlikely(!len)) |
1203 | return NULL; |
1204 | |
1205 | dwidth = at_xdmac_align_width(chan, addr: src_addr | dst_addr); |
1206 | |
1207 | /* Prepare descriptors. */ |
1208 | while (remaining_size) { |
1209 | struct at_xdmac_desc *desc = NULL; |
1210 | |
1211 | dev_dbg(chan2dev(chan), "%s: remaining_size=%zu\n" , __func__, remaining_size); |
1212 | |
1213 | spin_lock_irqsave(&atchan->lock, irqflags); |
1214 | desc = at_xdmac_get_desc(atchan); |
1215 | spin_unlock_irqrestore(lock: &atchan->lock, flags: irqflags); |
1216 | if (!desc) { |
1217 | dev_err(chan2dev(chan), "can't get descriptor\n" ); |
1218 | if (first) |
1219 | list_splice_tail_init(list: &first->descs_list, |
1220 | head: &atchan->free_descs_list); |
1221 | return NULL; |
1222 | } |
1223 | |
1224 | /* Update src and dest addresses. */ |
1225 | src_addr += xfer_size; |
1226 | dst_addr += xfer_size; |
1227 | |
1228 | if (remaining_size >= AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth) |
1229 | xfer_size = AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth; |
1230 | else |
1231 | xfer_size = remaining_size; |
1232 | |
1233 | dev_dbg(chan2dev(chan), "%s: xfer_size=%zu\n" , __func__, xfer_size); |
1234 | |
1235 | /* Check remaining length and change data width if needed. */ |
1236 | dwidth = at_xdmac_align_width(chan, |
1237 | addr: src_addr | dst_addr | xfer_size); |
1238 | chan_cc &= ~AT_XDMAC_CC_DWIDTH_MASK; |
1239 | chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth); |
1240 | |
1241 | ublen = xfer_size >> dwidth; |
1242 | remaining_size -= xfer_size; |
1243 | |
1244 | desc->lld.mbr_sa = src_addr; |
1245 | desc->lld.mbr_da = dst_addr; |
1246 | desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2 |
1247 | | AT_XDMAC_MBR_UBC_NDEN |
1248 | | AT_XDMAC_MBR_UBC_NSEN |
1249 | | ublen; |
1250 | desc->lld.mbr_cfg = chan_cc; |
1251 | |
1252 | dev_dbg(chan2dev(chan), |
1253 | "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n" , |
1254 | __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc, desc->lld.mbr_cfg); |
1255 | |
1256 | /* Chain lld. */ |
1257 | if (prev) |
1258 | at_xdmac_queue_desc(chan, prev, desc); |
1259 | |
1260 | prev = desc; |
1261 | if (!first) |
1262 | first = desc; |
1263 | |
1264 | dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n" , |
1265 | __func__, desc, first); |
1266 | list_add_tail(new: &desc->desc_node, head: &first->descs_list); |
1267 | } |
1268 | |
1269 | first->tx_dma_desc.flags = flags; |
1270 | first->xfer_size = len; |
1271 | |
1272 | return &first->tx_dma_desc; |
1273 | } |
1274 | |
1275 | static struct at_xdmac_desc *at_xdmac_memset_create_desc(struct dma_chan *chan, |
1276 | struct at_xdmac_chan *atchan, |
1277 | dma_addr_t dst_addr, |
1278 | size_t len, |
1279 | int value) |
1280 | { |
1281 | struct at_xdmac_desc *desc; |
1282 | unsigned long flags; |
1283 | size_t ublen; |
1284 | u32 dwidth; |
1285 | char pattern; |
1286 | /* |
1287 | * WARNING: The channel configuration is set here since there is no |
1288 | * dmaengine_slave_config call in this case. Moreover we don't know the |
1289 | * direction, it involves we can't dynamically set the source and dest |
1290 | * interface so we have to use the same one. Only interface 0 allows EBI |
1291 | * access. Hopefully we can access DDR through both ports (at least on |
1292 | * SAMA5D4x), so we can use the same interface for source and dest, |
1293 | * that solves the fact we don't know the direction. |
1294 | * ERRATA: Even if useless for memory transfers, the PERID has to not |
1295 | * match the one of another channel. If not, it could lead to spurious |
1296 | * flag status. |
1297 | * For SAMA7G5x case, the SIF and DIF fields are no longer used. |
1298 | * Thus, no need to have the SIF/DIF interfaces here. |
1299 | * For SAMA5D4x and SAMA5D2x the SIF and DIF are already configured as |
1300 | * zero. |
1301 | */ |
1302 | u32 chan_cc = AT_XDMAC_CC_PERID(0x7f) |
1303 | | AT_XDMAC_CC_DAM_UBS_AM |
1304 | | AT_XDMAC_CC_SAM_INCREMENTED_AM |
1305 | | AT_XDMAC_CC_MBSIZE_SIXTEEN |
1306 | | AT_XDMAC_CC_MEMSET_HW_MODE |
1307 | | AT_XDMAC_CC_TYPE_MEM_TRAN; |
1308 | |
1309 | dwidth = at_xdmac_align_width(chan, addr: dst_addr); |
1310 | |
1311 | if (len >= (AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)) { |
1312 | dev_err(chan2dev(chan), |
1313 | "%s: Transfer too large, aborting...\n" , |
1314 | __func__); |
1315 | return NULL; |
1316 | } |
1317 | |
1318 | spin_lock_irqsave(&atchan->lock, flags); |
1319 | desc = at_xdmac_get_desc(atchan); |
1320 | spin_unlock_irqrestore(lock: &atchan->lock, flags); |
1321 | if (!desc) { |
1322 | dev_err(chan2dev(chan), "can't get descriptor\n" ); |
1323 | return NULL; |
1324 | } |
1325 | |
1326 | chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth); |
1327 | |
1328 | /* Only the first byte of value is to be used according to dmaengine */ |
1329 | pattern = (char)value; |
1330 | |
1331 | ublen = len >> dwidth; |
1332 | |
1333 | desc->lld.mbr_da = dst_addr; |
1334 | desc->lld.mbr_ds = (pattern << 24) | |
1335 | (pattern << 16) | |
1336 | (pattern << 8) | |
1337 | pattern; |
1338 | desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV3 |
1339 | | AT_XDMAC_MBR_UBC_NDEN |
1340 | | AT_XDMAC_MBR_UBC_NSEN |
1341 | | ublen; |
1342 | desc->lld.mbr_cfg = chan_cc; |
1343 | |
1344 | dev_dbg(chan2dev(chan), |
1345 | "%s: lld: mbr_da=%pad, mbr_ds=0x%08x, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n" , |
1346 | __func__, &desc->lld.mbr_da, desc->lld.mbr_ds, desc->lld.mbr_ubc, |
1347 | desc->lld.mbr_cfg); |
1348 | |
1349 | return desc; |
1350 | } |
1351 | |
1352 | static struct dma_async_tx_descriptor * |
1353 | at_xdmac_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value, |
1354 | size_t len, unsigned long flags) |
1355 | { |
1356 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
1357 | struct at_xdmac_desc *desc; |
1358 | |
1359 | dev_dbg(chan2dev(chan), "%s: dest=%pad, len=%zu, pattern=0x%x, flags=0x%lx\n" , |
1360 | __func__, &dest, len, value, flags); |
1361 | |
1362 | if (unlikely(!len)) |
1363 | return NULL; |
1364 | |
1365 | desc = at_xdmac_memset_create_desc(chan, atchan, dst_addr: dest, len, value); |
1366 | list_add_tail(new: &desc->desc_node, head: &desc->descs_list); |
1367 | |
1368 | desc->tx_dma_desc.cookie = -EBUSY; |
1369 | desc->tx_dma_desc.flags = flags; |
1370 | desc->xfer_size = len; |
1371 | |
1372 | return &desc->tx_dma_desc; |
1373 | } |
1374 | |
1375 | static struct dma_async_tx_descriptor * |
1376 | at_xdmac_prep_dma_memset_sg(struct dma_chan *chan, struct scatterlist *sgl, |
1377 | unsigned int sg_len, int value, |
1378 | unsigned long flags) |
1379 | { |
1380 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
1381 | struct at_xdmac_desc *desc, *pdesc = NULL, |
1382 | *ppdesc = NULL, *first = NULL; |
1383 | struct scatterlist *sg, *psg = NULL, *ppsg = NULL; |
1384 | size_t stride = 0, pstride = 0, len = 0; |
1385 | int i; |
1386 | |
1387 | if (!sgl) |
1388 | return NULL; |
1389 | |
1390 | dev_dbg(chan2dev(chan), "%s: sg_len=%d, value=0x%x, flags=0x%lx\n" , |
1391 | __func__, sg_len, value, flags); |
1392 | |
1393 | /* Prepare descriptors. */ |
1394 | for_each_sg(sgl, sg, sg_len, i) { |
1395 | dev_dbg(chan2dev(chan), "%s: dest=%pad, len=%d, pattern=0x%x, flags=0x%lx\n" , |
1396 | __func__, &sg_dma_address(sg), sg_dma_len(sg), |
1397 | value, flags); |
1398 | desc = at_xdmac_memset_create_desc(chan, atchan, |
1399 | sg_dma_address(sg), |
1400 | sg_dma_len(sg), |
1401 | value); |
1402 | if (!desc && first) |
1403 | list_splice_tail_init(list: &first->descs_list, |
1404 | head: &atchan->free_descs_list); |
1405 | |
1406 | if (!first) |
1407 | first = desc; |
1408 | |
1409 | /* Update our strides */ |
1410 | pstride = stride; |
1411 | if (psg) |
1412 | stride = sg_dma_address(sg) - |
1413 | (sg_dma_address(psg) + sg_dma_len(psg)); |
1414 | |
1415 | /* |
1416 | * The scatterlist API gives us only the address and |
1417 | * length of each elements. |
1418 | * |
1419 | * Unfortunately, we don't have the stride, which we |
1420 | * will need to compute. |
1421 | * |
1422 | * That make us end up in a situation like this one: |
1423 | * len stride len stride len |
1424 | * +-------+ +-------+ +-------+ |
1425 | * | N-2 | | N-1 | | N | |
1426 | * +-------+ +-------+ +-------+ |
1427 | * |
1428 | * We need all these three elements (N-2, N-1 and N) |
1429 | * to actually take the decision on whether we need to |
1430 | * queue N-1 or reuse N-2. |
1431 | * |
1432 | * We will only consider N if it is the last element. |
1433 | */ |
1434 | if (ppdesc && pdesc) { |
1435 | if ((stride == pstride) && |
1436 | (sg_dma_len(ppsg) == sg_dma_len(psg))) { |
1437 | dev_dbg(chan2dev(chan), |
1438 | "%s: desc 0x%p can be merged with desc 0x%p\n" , |
1439 | __func__, pdesc, ppdesc); |
1440 | |
1441 | /* |
1442 | * Increment the block count of the |
1443 | * N-2 descriptor |
1444 | */ |
1445 | at_xdmac_increment_block_count(chan, desc: ppdesc); |
1446 | ppdesc->lld.mbr_dus = stride; |
1447 | |
1448 | /* |
1449 | * Put back the N-1 descriptor in the |
1450 | * free descriptor list |
1451 | */ |
1452 | list_add_tail(new: &pdesc->desc_node, |
1453 | head: &atchan->free_descs_list); |
1454 | |
1455 | /* |
1456 | * Make our N-1 descriptor pointer |
1457 | * point to the N-2 since they were |
1458 | * actually merged. |
1459 | */ |
1460 | pdesc = ppdesc; |
1461 | |
1462 | /* |
1463 | * Rule out the case where we don't have |
1464 | * pstride computed yet (our second sg |
1465 | * element) |
1466 | * |
1467 | * We also want to catch the case where there |
1468 | * would be a negative stride, |
1469 | */ |
1470 | } else if (pstride || |
1471 | sg_dma_address(sg) < sg_dma_address(psg)) { |
1472 | /* |
1473 | * Queue the N-1 descriptor after the |
1474 | * N-2 |
1475 | */ |
1476 | at_xdmac_queue_desc(chan, prev: ppdesc, desc: pdesc); |
1477 | |
1478 | /* |
1479 | * Add the N-1 descriptor to the list |
1480 | * of the descriptors used for this |
1481 | * transfer |
1482 | */ |
1483 | list_add_tail(new: &desc->desc_node, |
1484 | head: &first->descs_list); |
1485 | dev_dbg(chan2dev(chan), |
1486 | "%s: add desc 0x%p to descs_list 0x%p\n" , |
1487 | __func__, desc, first); |
1488 | } |
1489 | } |
1490 | |
1491 | /* |
1492 | * If we are the last element, just see if we have the |
1493 | * same size than the previous element. |
1494 | * |
1495 | * If so, we can merge it with the previous descriptor |
1496 | * since we don't care about the stride anymore. |
1497 | */ |
1498 | if ((i == (sg_len - 1)) && |
1499 | sg_dma_len(psg) == sg_dma_len(sg)) { |
1500 | dev_dbg(chan2dev(chan), |
1501 | "%s: desc 0x%p can be merged with desc 0x%p\n" , |
1502 | __func__, desc, pdesc); |
1503 | |
1504 | /* |
1505 | * Increment the block count of the N-1 |
1506 | * descriptor |
1507 | */ |
1508 | at_xdmac_increment_block_count(chan, desc: pdesc); |
1509 | pdesc->lld.mbr_dus = stride; |
1510 | |
1511 | /* |
1512 | * Put back the N descriptor in the free |
1513 | * descriptor list |
1514 | */ |
1515 | list_add_tail(new: &desc->desc_node, |
1516 | head: &atchan->free_descs_list); |
1517 | } |
1518 | |
1519 | /* Update our descriptors */ |
1520 | ppdesc = pdesc; |
1521 | pdesc = desc; |
1522 | |
1523 | /* Update our scatter pointers */ |
1524 | ppsg = psg; |
1525 | psg = sg; |
1526 | |
1527 | len += sg_dma_len(sg); |
1528 | } |
1529 | |
1530 | first->tx_dma_desc.cookie = -EBUSY; |
1531 | first->tx_dma_desc.flags = flags; |
1532 | first->xfer_size = len; |
1533 | |
1534 | return &first->tx_dma_desc; |
1535 | } |
1536 | |
1537 | static enum dma_status |
1538 | at_xdmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie, |
1539 | struct dma_tx_state *txstate) |
1540 | { |
1541 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
1542 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
1543 | struct at_xdmac_desc *desc, *_desc, *iter; |
1544 | struct list_head *descs_list; |
1545 | enum dma_status ret; |
1546 | int residue, retry, pm_status; |
1547 | u32 cur_nda, check_nda, cur_ubc, mask, value; |
1548 | u8 dwidth = 0; |
1549 | unsigned long flags; |
1550 | bool initd; |
1551 | |
1552 | ret = dma_cookie_status(chan, cookie, state: txstate); |
1553 | if (ret == DMA_COMPLETE || !txstate) |
1554 | return ret; |
1555 | |
1556 | pm_status = pm_runtime_resume_and_get(dev: atxdmac->dev); |
1557 | if (pm_status < 0) |
1558 | return DMA_ERROR; |
1559 | |
1560 | spin_lock_irqsave(&atchan->lock, flags); |
1561 | |
1562 | desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node); |
1563 | |
1564 | /* |
1565 | * If the transfer has not been started yet, don't need to compute the |
1566 | * residue, it's the transfer length. |
1567 | */ |
1568 | if (!desc->active_xfer) { |
1569 | dma_set_residue(state: txstate, residue: desc->xfer_size); |
1570 | goto spin_unlock; |
1571 | } |
1572 | |
1573 | residue = desc->xfer_size; |
1574 | /* |
1575 | * Flush FIFO: only relevant when the transfer is source peripheral |
1576 | * synchronized. Flush is needed before reading CUBC because data in |
1577 | * the FIFO are not reported by CUBC. Reporting a residue of the |
1578 | * transfer length while we have data in FIFO can cause issue. |
1579 | * Usecase: atmel USART has a timeout which means I have received |
1580 | * characters but there is no more character received for a while. On |
1581 | * timeout, it requests the residue. If the data are in the DMA FIFO, |
1582 | * we will return a residue of the transfer length. It means no data |
1583 | * received. If an application is waiting for these data, it will hang |
1584 | * since we won't have another USART timeout without receiving new |
1585 | * data. |
1586 | */ |
1587 | mask = AT_XDMAC_CC_TYPE | AT_XDMAC_CC_DSYNC; |
1588 | value = AT_XDMAC_CC_TYPE_PER_TRAN | AT_XDMAC_CC_DSYNC_PER2MEM; |
1589 | if ((desc->lld.mbr_cfg & mask) == value) { |
1590 | at_xdmac_write(atxdmac, atxdmac->layout->gswf, atchan->mask); |
1591 | while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS)) |
1592 | cpu_relax(); |
1593 | } |
1594 | |
1595 | /* |
1596 | * The easiest way to compute the residue should be to pause the DMA |
1597 | * but doing this can lead to miss some data as some devices don't |
1598 | * have FIFO. |
1599 | * We need to read several registers because: |
1600 | * - DMA is running therefore a descriptor change is possible while |
1601 | * reading these registers |
1602 | * - When the block transfer is done, the value of the CUBC register |
1603 | * is set to its initial value until the fetch of the next descriptor. |
1604 | * This value will corrupt the residue calculation so we have to skip |
1605 | * it. |
1606 | * |
1607 | * INITD -------- ------------ |
1608 | * |____________________| |
1609 | * _______________________ _______________ |
1610 | * NDA @desc2 \/ @desc3 |
1611 | * _______________________/\_______________ |
1612 | * __________ ___________ _______________ |
1613 | * CUBC 0 \/ MAX desc1 \/ MAX desc2 |
1614 | * __________/\___________/\_______________ |
1615 | * |
1616 | * Since descriptors are aligned on 64 bits, we can assume that |
1617 | * the update of NDA and CUBC is atomic. |
1618 | * Memory barriers are used to ensure the read order of the registers. |
1619 | * A max number of retries is set because unlikely it could never ends. |
1620 | */ |
1621 | for (retry = 0; retry < AT_XDMAC_RESIDUE_MAX_RETRIES; retry++) { |
1622 | check_nda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA) & 0xfffffffc; |
1623 | rmb(); |
1624 | cur_ubc = at_xdmac_chan_read(atchan, AT_XDMAC_CUBC); |
1625 | rmb(); |
1626 | initd = !!(at_xdmac_chan_read(atchan, AT_XDMAC_CC) & AT_XDMAC_CC_INITD); |
1627 | rmb(); |
1628 | cur_nda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA) & 0xfffffffc; |
1629 | rmb(); |
1630 | |
1631 | if ((check_nda == cur_nda) && initd) |
1632 | break; |
1633 | } |
1634 | |
1635 | if (unlikely(retry >= AT_XDMAC_RESIDUE_MAX_RETRIES)) { |
1636 | ret = DMA_ERROR; |
1637 | goto spin_unlock; |
1638 | } |
1639 | |
1640 | /* |
1641 | * Flush FIFO: only relevant when the transfer is source peripheral |
1642 | * synchronized. Another flush is needed here because CUBC is updated |
1643 | * when the controller sends the data write command. It can lead to |
1644 | * report data that are not written in the memory or the device. The |
1645 | * FIFO flush ensures that data are really written. |
1646 | */ |
1647 | if ((desc->lld.mbr_cfg & mask) == value) { |
1648 | at_xdmac_write(atxdmac, atxdmac->layout->gswf, atchan->mask); |
1649 | while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS)) |
1650 | cpu_relax(); |
1651 | } |
1652 | |
1653 | /* |
1654 | * Remove size of all microblocks already transferred and the current |
1655 | * one. Then add the remaining size to transfer of the current |
1656 | * microblock. |
1657 | */ |
1658 | descs_list = &desc->descs_list; |
1659 | list_for_each_entry_safe(iter, _desc, descs_list, desc_node) { |
1660 | dwidth = at_xdmac_get_dwidth(cfg: iter->lld.mbr_cfg); |
1661 | residue -= (iter->lld.mbr_ubc & 0xffffff) << dwidth; |
1662 | if ((iter->lld.mbr_nda & 0xfffffffc) == cur_nda) { |
1663 | desc = iter; |
1664 | break; |
1665 | } |
1666 | } |
1667 | residue += cur_ubc << dwidth; |
1668 | |
1669 | dma_set_residue(state: txstate, residue); |
1670 | |
1671 | dev_dbg(chan2dev(chan), |
1672 | "%s: desc=0x%p, tx_dma_desc.phys=%pad, tx_status=%d, cookie=%d, residue=%d\n" , |
1673 | __func__, desc, &desc->tx_dma_desc.phys, ret, cookie, residue); |
1674 | |
1675 | spin_unlock: |
1676 | spin_unlock_irqrestore(lock: &atchan->lock, flags); |
1677 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
1678 | pm_runtime_put_autosuspend(dev: atxdmac->dev); |
1679 | return ret; |
1680 | } |
1681 | |
1682 | static void at_xdmac_advance_work(struct at_xdmac_chan *atchan) |
1683 | { |
1684 | struct at_xdmac_desc *desc; |
1685 | |
1686 | /* |
1687 | * If channel is enabled, do nothing, advance_work will be triggered |
1688 | * after the interruption. |
1689 | */ |
1690 | if (at_xdmac_chan_is_enabled(atchan) || list_empty(head: &atchan->xfers_list)) |
1691 | return; |
1692 | |
1693 | desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, |
1694 | xfer_node); |
1695 | dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n" , __func__, desc); |
1696 | if (!desc->active_xfer) |
1697 | at_xdmac_start_xfer(atchan, first: desc); |
1698 | } |
1699 | |
1700 | static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan) |
1701 | { |
1702 | struct at_xdmac_desc *desc; |
1703 | struct dma_async_tx_descriptor *txd; |
1704 | |
1705 | spin_lock_irq(lock: &atchan->lock); |
1706 | dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08x\n" , |
1707 | __func__, atchan->irq_status); |
1708 | if (list_empty(head: &atchan->xfers_list)) { |
1709 | spin_unlock_irq(lock: &atchan->lock); |
1710 | return; |
1711 | } |
1712 | desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, |
1713 | xfer_node); |
1714 | spin_unlock_irq(lock: &atchan->lock); |
1715 | txd = &desc->tx_dma_desc; |
1716 | if (txd->flags & DMA_PREP_INTERRUPT) |
1717 | dmaengine_desc_get_callback_invoke(tx: txd, NULL); |
1718 | } |
1719 | |
1720 | /* Called with atchan->lock held. */ |
1721 | static void at_xdmac_handle_error(struct at_xdmac_chan *atchan) |
1722 | { |
1723 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
1724 | struct at_xdmac_desc *bad_desc; |
1725 | int ret; |
1726 | |
1727 | ret = pm_runtime_resume_and_get(dev: atxdmac->dev); |
1728 | if (ret < 0) |
1729 | return; |
1730 | |
1731 | /* |
1732 | * The descriptor currently at the head of the active list is |
1733 | * broken. Since we don't have any way to report errors, we'll |
1734 | * just have to scream loudly and try to continue with other |
1735 | * descriptors queued (if any). |
1736 | */ |
1737 | if (atchan->irq_status & AT_XDMAC_CIS_RBEIS) |
1738 | dev_err(chan2dev(&atchan->chan), "read bus error!!!" ); |
1739 | if (atchan->irq_status & AT_XDMAC_CIS_WBEIS) |
1740 | dev_err(chan2dev(&atchan->chan), "write bus error!!!" ); |
1741 | if (atchan->irq_status & AT_XDMAC_CIS_ROIS) |
1742 | dev_err(chan2dev(&atchan->chan), "request overflow error!!!" ); |
1743 | |
1744 | /* Channel must be disabled first as it's not done automatically */ |
1745 | at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); |
1746 | while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask) |
1747 | cpu_relax(); |
1748 | |
1749 | bad_desc = list_first_entry(&atchan->xfers_list, |
1750 | struct at_xdmac_desc, |
1751 | xfer_node); |
1752 | |
1753 | /* Print bad descriptor's details if needed */ |
1754 | dev_dbg(chan2dev(&atchan->chan), |
1755 | "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n" , |
1756 | __func__, &bad_desc->lld.mbr_sa, &bad_desc->lld.mbr_da, |
1757 | bad_desc->lld.mbr_ubc); |
1758 | |
1759 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
1760 | pm_runtime_put_autosuspend(dev: atxdmac->dev); |
1761 | |
1762 | /* Then continue with usual descriptor management */ |
1763 | } |
1764 | |
1765 | static void at_xdmac_tasklet(struct tasklet_struct *t) |
1766 | { |
1767 | struct at_xdmac_chan *atchan = from_tasklet(atchan, t, tasklet); |
1768 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
1769 | struct at_xdmac_desc *desc; |
1770 | struct dma_async_tx_descriptor *txd; |
1771 | u32 error_mask; |
1772 | |
1773 | if (at_xdmac_chan_is_cyclic(atchan)) |
1774 | return at_xdmac_handle_cyclic(atchan); |
1775 | |
1776 | error_mask = AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS | |
1777 | AT_XDMAC_CIS_ROIS; |
1778 | |
1779 | spin_lock_irq(lock: &atchan->lock); |
1780 | |
1781 | dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08x\n" , |
1782 | __func__, atchan->irq_status); |
1783 | |
1784 | if (!(atchan->irq_status & AT_XDMAC_CIS_LIS) && |
1785 | !(atchan->irq_status & error_mask)) { |
1786 | spin_unlock_irq(lock: &atchan->lock); |
1787 | return; |
1788 | } |
1789 | |
1790 | if (atchan->irq_status & error_mask) |
1791 | at_xdmac_handle_error(atchan); |
1792 | |
1793 | desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, |
1794 | xfer_node); |
1795 | dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n" , __func__, desc); |
1796 | if (!desc->active_xfer) { |
1797 | dev_err(chan2dev(&atchan->chan), "Xfer not active: exiting" ); |
1798 | spin_unlock_irq(lock: &atchan->lock); |
1799 | return; |
1800 | } |
1801 | |
1802 | txd = &desc->tx_dma_desc; |
1803 | dma_cookie_complete(tx: txd); |
1804 | /* Remove the transfer from the transfer list. */ |
1805 | list_del(entry: &desc->xfer_node); |
1806 | spin_unlock_irq(lock: &atchan->lock); |
1807 | |
1808 | if (txd->flags & DMA_PREP_INTERRUPT) |
1809 | dmaengine_desc_get_callback_invoke(tx: txd, NULL); |
1810 | |
1811 | dma_run_dependencies(tx: txd); |
1812 | |
1813 | spin_lock_irq(lock: &atchan->lock); |
1814 | /* Move the xfer descriptors into the free descriptors list. */ |
1815 | list_splice_tail_init(list: &desc->descs_list, head: &atchan->free_descs_list); |
1816 | at_xdmac_advance_work(atchan); |
1817 | spin_unlock_irq(lock: &atchan->lock); |
1818 | |
1819 | /* |
1820 | * Decrement runtime PM ref counter incremented in |
1821 | * at_xdmac_start_xfer(). |
1822 | */ |
1823 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
1824 | pm_runtime_put_autosuspend(dev: atxdmac->dev); |
1825 | } |
1826 | |
1827 | static irqreturn_t at_xdmac_interrupt(int irq, void *dev_id) |
1828 | { |
1829 | struct at_xdmac *atxdmac = (struct at_xdmac *)dev_id; |
1830 | struct at_xdmac_chan *atchan; |
1831 | u32 imr, status, pending; |
1832 | u32 chan_imr, chan_status; |
1833 | int i, ret = IRQ_NONE; |
1834 | |
1835 | do { |
1836 | imr = at_xdmac_read(atxdmac, AT_XDMAC_GIM); |
1837 | status = at_xdmac_read(atxdmac, AT_XDMAC_GIS); |
1838 | pending = status & imr; |
1839 | |
1840 | dev_vdbg(atxdmac->dma.dev, |
1841 | "%s: status=0x%08x, imr=0x%08x, pending=0x%08x\n" , |
1842 | __func__, status, imr, pending); |
1843 | |
1844 | if (!pending) |
1845 | break; |
1846 | |
1847 | /* We have to find which channel has generated the interrupt. */ |
1848 | for (i = 0; i < atxdmac->dma.chancnt; i++) { |
1849 | if (!((1 << i) & pending)) |
1850 | continue; |
1851 | |
1852 | atchan = &atxdmac->chan[i]; |
1853 | chan_imr = at_xdmac_chan_read(atchan, AT_XDMAC_CIM); |
1854 | chan_status = at_xdmac_chan_read(atchan, AT_XDMAC_CIS); |
1855 | atchan->irq_status = chan_status & chan_imr; |
1856 | dev_vdbg(atxdmac->dma.dev, |
1857 | "%s: chan%d: imr=0x%x, status=0x%x\n" , |
1858 | __func__, i, chan_imr, chan_status); |
1859 | dev_vdbg(chan2dev(&atchan->chan), |
1860 | "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n" , |
1861 | __func__, |
1862 | at_xdmac_chan_read(atchan, AT_XDMAC_CC), |
1863 | at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), |
1864 | at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), |
1865 | at_xdmac_chan_read(atchan, AT_XDMAC_CSA), |
1866 | at_xdmac_chan_read(atchan, AT_XDMAC_CDA), |
1867 | at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); |
1868 | |
1869 | if (atchan->irq_status & (AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS)) |
1870 | at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); |
1871 | |
1872 | tasklet_schedule(t: &atchan->tasklet); |
1873 | ret = IRQ_HANDLED; |
1874 | } |
1875 | |
1876 | } while (pending); |
1877 | |
1878 | return ret; |
1879 | } |
1880 | |
1881 | static void at_xdmac_issue_pending(struct dma_chan *chan) |
1882 | { |
1883 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
1884 | unsigned long flags; |
1885 | |
1886 | dev_dbg(chan2dev(&atchan->chan), "%s\n" , __func__); |
1887 | |
1888 | spin_lock_irqsave(&atchan->lock, flags); |
1889 | at_xdmac_advance_work(atchan); |
1890 | spin_unlock_irqrestore(lock: &atchan->lock, flags); |
1891 | |
1892 | return; |
1893 | } |
1894 | |
1895 | static int at_xdmac_device_config(struct dma_chan *chan, |
1896 | struct dma_slave_config *config) |
1897 | { |
1898 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
1899 | int ret; |
1900 | unsigned long flags; |
1901 | |
1902 | dev_dbg(chan2dev(chan), "%s\n" , __func__); |
1903 | |
1904 | spin_lock_irqsave(&atchan->lock, flags); |
1905 | ret = at_xdmac_set_slave_config(chan, sconfig: config); |
1906 | spin_unlock_irqrestore(lock: &atchan->lock, flags); |
1907 | |
1908 | return ret; |
1909 | } |
1910 | |
1911 | static void at_xdmac_device_pause_set(struct at_xdmac *atxdmac, |
1912 | struct at_xdmac_chan *atchan) |
1913 | { |
1914 | at_xdmac_write(atxdmac, atxdmac->layout->grws, atchan->mask); |
1915 | while (at_xdmac_chan_read(atchan, AT_XDMAC_CC) & |
1916 | (AT_XDMAC_CC_WRIP | AT_XDMAC_CC_RDIP)) |
1917 | cpu_relax(); |
1918 | } |
1919 | |
1920 | static void at_xdmac_device_pause_internal(struct at_xdmac_chan *atchan) |
1921 | { |
1922 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
1923 | unsigned long flags; |
1924 | |
1925 | spin_lock_irqsave(&atchan->lock, flags); |
1926 | set_bit(nr: AT_XDMAC_CHAN_IS_PAUSED_INTERNAL, addr: &atchan->status); |
1927 | at_xdmac_device_pause_set(atxdmac, atchan); |
1928 | spin_unlock_irqrestore(lock: &atchan->lock, flags); |
1929 | } |
1930 | |
1931 | static int at_xdmac_device_pause(struct dma_chan *chan) |
1932 | { |
1933 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
1934 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
1935 | unsigned long flags; |
1936 | int ret; |
1937 | |
1938 | dev_dbg(chan2dev(chan), "%s\n" , __func__); |
1939 | |
1940 | if (test_and_set_bit(nr: AT_XDMAC_CHAN_IS_PAUSED, addr: &atchan->status)) |
1941 | return 0; |
1942 | |
1943 | ret = pm_runtime_resume_and_get(dev: atxdmac->dev); |
1944 | if (ret < 0) |
1945 | return ret; |
1946 | |
1947 | spin_lock_irqsave(&atchan->lock, flags); |
1948 | |
1949 | at_xdmac_device_pause_set(atxdmac, atchan); |
1950 | /* Decrement runtime PM ref counter for each active descriptor. */ |
1951 | at_xdmac_runtime_suspend_descriptors(atchan); |
1952 | |
1953 | spin_unlock_irqrestore(lock: &atchan->lock, flags); |
1954 | |
1955 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
1956 | pm_runtime_put_autosuspend(dev: atxdmac->dev); |
1957 | |
1958 | return 0; |
1959 | } |
1960 | |
1961 | static void at_xdmac_device_resume_internal(struct at_xdmac_chan *atchan) |
1962 | { |
1963 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
1964 | unsigned long flags; |
1965 | |
1966 | spin_lock_irqsave(&atchan->lock, flags); |
1967 | at_xdmac_write(atxdmac, atxdmac->layout->grwr, atchan->mask); |
1968 | clear_bit(nr: AT_XDMAC_CHAN_IS_PAUSED_INTERNAL, addr: &atchan->status); |
1969 | spin_unlock_irqrestore(lock: &atchan->lock, flags); |
1970 | } |
1971 | |
1972 | static int at_xdmac_device_resume(struct dma_chan *chan) |
1973 | { |
1974 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
1975 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
1976 | unsigned long flags; |
1977 | int ret; |
1978 | |
1979 | dev_dbg(chan2dev(chan), "%s\n" , __func__); |
1980 | |
1981 | ret = pm_runtime_resume_and_get(dev: atxdmac->dev); |
1982 | if (ret < 0) |
1983 | return ret; |
1984 | |
1985 | spin_lock_irqsave(&atchan->lock, flags); |
1986 | if (!at_xdmac_chan_is_paused(atchan)) |
1987 | goto unlock; |
1988 | |
1989 | /* Increment runtime PM ref counter for each active descriptor. */ |
1990 | ret = at_xdmac_runtime_resume_descriptors(atchan); |
1991 | if (ret < 0) |
1992 | goto unlock; |
1993 | |
1994 | at_xdmac_write(atxdmac, atxdmac->layout->grwr, atchan->mask); |
1995 | clear_bit(nr: AT_XDMAC_CHAN_IS_PAUSED, addr: &atchan->status); |
1996 | |
1997 | unlock: |
1998 | spin_unlock_irqrestore(lock: &atchan->lock, flags); |
1999 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
2000 | pm_runtime_put_autosuspend(dev: atxdmac->dev); |
2001 | |
2002 | return ret; |
2003 | } |
2004 | |
2005 | static int at_xdmac_device_terminate_all(struct dma_chan *chan) |
2006 | { |
2007 | struct at_xdmac_desc *desc, *_desc; |
2008 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
2009 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: atchan->chan.device); |
2010 | unsigned long flags; |
2011 | int ret; |
2012 | |
2013 | dev_dbg(chan2dev(chan), "%s\n" , __func__); |
2014 | |
2015 | ret = pm_runtime_resume_and_get(dev: atxdmac->dev); |
2016 | if (ret < 0) |
2017 | return ret; |
2018 | |
2019 | spin_lock_irqsave(&atchan->lock, flags); |
2020 | at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); |
2021 | while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask) |
2022 | cpu_relax(); |
2023 | |
2024 | /* Cancel all pending transfers. */ |
2025 | list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node) { |
2026 | list_del(entry: &desc->xfer_node); |
2027 | list_splice_tail_init(list: &desc->descs_list, |
2028 | head: &atchan->free_descs_list); |
2029 | /* |
2030 | * We incremented the runtime PM reference count on |
2031 | * at_xdmac_start_xfer() for this descriptor. Now it's time |
2032 | * to release it. |
2033 | */ |
2034 | if (desc->active_xfer) { |
2035 | pm_runtime_put_autosuspend(dev: atxdmac->dev); |
2036 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
2037 | } |
2038 | } |
2039 | |
2040 | clear_bit(nr: AT_XDMAC_CHAN_IS_PAUSED, addr: &atchan->status); |
2041 | clear_bit(nr: AT_XDMAC_CHAN_IS_CYCLIC, addr: &atchan->status); |
2042 | spin_unlock_irqrestore(lock: &atchan->lock, flags); |
2043 | |
2044 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
2045 | pm_runtime_put_autosuspend(dev: atxdmac->dev); |
2046 | |
2047 | return 0; |
2048 | } |
2049 | |
2050 | static int at_xdmac_alloc_chan_resources(struct dma_chan *chan) |
2051 | { |
2052 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
2053 | struct at_xdmac_desc *desc; |
2054 | int i; |
2055 | |
2056 | if (at_xdmac_chan_is_enabled(atchan)) { |
2057 | dev_err(chan2dev(chan), |
2058 | "can't allocate channel resources (channel enabled)\n" ); |
2059 | return -EIO; |
2060 | } |
2061 | |
2062 | if (!list_empty(head: &atchan->free_descs_list)) { |
2063 | dev_err(chan2dev(chan), |
2064 | "can't allocate channel resources (channel not free from a previous use)\n" ); |
2065 | return -EIO; |
2066 | } |
2067 | |
2068 | for (i = 0; i < init_nr_desc_per_channel; i++) { |
2069 | desc = at_xdmac_alloc_desc(chan, GFP_KERNEL); |
2070 | if (!desc) { |
2071 | if (i == 0) { |
2072 | dev_warn(chan2dev(chan), |
2073 | "can't allocate any descriptors\n" ); |
2074 | return -EIO; |
2075 | } |
2076 | dev_warn(chan2dev(chan), |
2077 | "only %d descriptors have been allocated\n" , i); |
2078 | break; |
2079 | } |
2080 | list_add_tail(new: &desc->desc_node, head: &atchan->free_descs_list); |
2081 | } |
2082 | |
2083 | dma_cookie_init(chan); |
2084 | |
2085 | dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n" , __func__, i); |
2086 | |
2087 | return i; |
2088 | } |
2089 | |
2090 | static void at_xdmac_free_chan_resources(struct dma_chan *chan) |
2091 | { |
2092 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
2093 | struct at_xdmac *atxdmac = to_at_xdmac(ddev: chan->device); |
2094 | struct at_xdmac_desc *desc, *_desc; |
2095 | |
2096 | list_for_each_entry_safe(desc, _desc, &atchan->free_descs_list, desc_node) { |
2097 | dev_dbg(chan2dev(chan), "%s: freeing descriptor %p\n" , __func__, desc); |
2098 | list_del(entry: &desc->desc_node); |
2099 | dma_pool_free(pool: atxdmac->at_xdmac_desc_pool, vaddr: desc, addr: desc->tx_dma_desc.phys); |
2100 | } |
2101 | |
2102 | return; |
2103 | } |
2104 | |
2105 | static void at_xdmac_axi_config(struct platform_device *pdev) |
2106 | { |
2107 | struct at_xdmac *atxdmac = (struct at_xdmac *)platform_get_drvdata(pdev); |
2108 | bool dev_m2m = false; |
2109 | u32 dma_requests; |
2110 | |
2111 | if (!atxdmac->layout->axi_config) |
2112 | return; /* Not supported */ |
2113 | |
2114 | if (!of_property_read_u32(np: pdev->dev.of_node, propname: "dma-requests" , |
2115 | out_value: &dma_requests)) { |
2116 | dev_info(&pdev->dev, "controller in mem2mem mode.\n" ); |
2117 | dev_m2m = true; |
2118 | } |
2119 | |
2120 | if (dev_m2m) { |
2121 | at_xdmac_write(atxdmac, AT_XDMAC_GCFG, AT_XDMAC_GCFG_M2M); |
2122 | at_xdmac_write(atxdmac, AT_XDMAC_GWAC, AT_XDMAC_GWAC_M2M); |
2123 | } else { |
2124 | at_xdmac_write(atxdmac, AT_XDMAC_GCFG, AT_XDMAC_GCFG_P2M); |
2125 | at_xdmac_write(atxdmac, AT_XDMAC_GWAC, AT_XDMAC_GWAC_P2M); |
2126 | } |
2127 | } |
2128 | |
2129 | static int __maybe_unused atmel_xdmac_prepare(struct device *dev) |
2130 | { |
2131 | struct at_xdmac *atxdmac = dev_get_drvdata(dev); |
2132 | struct dma_chan *chan, *_chan; |
2133 | |
2134 | list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { |
2135 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
2136 | |
2137 | /* Wait for transfer completion, except in cyclic case. */ |
2138 | if (at_xdmac_chan_is_enabled(atchan) && !at_xdmac_chan_is_cyclic(atchan)) |
2139 | return -EAGAIN; |
2140 | } |
2141 | return 0; |
2142 | } |
2143 | |
2144 | static int __maybe_unused atmel_xdmac_suspend(struct device *dev) |
2145 | { |
2146 | struct at_xdmac *atxdmac = dev_get_drvdata(dev); |
2147 | struct dma_chan *chan, *_chan; |
2148 | int ret; |
2149 | |
2150 | ret = pm_runtime_resume_and_get(dev: atxdmac->dev); |
2151 | if (ret < 0) |
2152 | return ret; |
2153 | |
2154 | list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { |
2155 | struct at_xdmac_chan *atchan = to_at_xdmac_chan(dchan: chan); |
2156 | |
2157 | atchan->save_cc = at_xdmac_chan_read(atchan, AT_XDMAC_CC); |
2158 | if (at_xdmac_chan_is_cyclic(atchan)) { |
2159 | if (!at_xdmac_chan_is_paused(atchan)) { |
2160 | dev_warn(chan2dev(chan), "%s: channel %d not paused\n" , |
2161 | __func__, chan->chan_id); |
2162 | at_xdmac_device_pause_internal(atchan); |
2163 | at_xdmac_runtime_suspend_descriptors(atchan); |
2164 | } |
2165 | atchan->save_cim = at_xdmac_chan_read(atchan, AT_XDMAC_CIM); |
2166 | atchan->save_cnda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA); |
2167 | atchan->save_cndc = at_xdmac_chan_read(atchan, AT_XDMAC_CNDC); |
2168 | } |
2169 | } |
2170 | atxdmac->save_gim = at_xdmac_read(atxdmac, AT_XDMAC_GIM); |
2171 | atxdmac->save_gs = at_xdmac_read(atxdmac, AT_XDMAC_GS); |
2172 | |
2173 | at_xdmac_off(atxdmac, suspend_descriptors: false); |
2174 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
2175 | pm_runtime_put_noidle(dev: atxdmac->dev); |
2176 | clk_disable_unprepare(clk: atxdmac->clk); |
2177 | |
2178 | return 0; |
2179 | } |
2180 | |
2181 | static int __maybe_unused atmel_xdmac_resume(struct device *dev) |
2182 | { |
2183 | struct at_xdmac *atxdmac = dev_get_drvdata(dev); |
2184 | struct at_xdmac_chan *atchan; |
2185 | struct dma_chan *chan, *_chan; |
2186 | struct platform_device *pdev = container_of(dev, struct platform_device, dev); |
2187 | int i, ret; |
2188 | |
2189 | ret = clk_prepare_enable(clk: atxdmac->clk); |
2190 | if (ret) |
2191 | return ret; |
2192 | |
2193 | pm_runtime_get_noresume(dev: atxdmac->dev); |
2194 | |
2195 | at_xdmac_axi_config(pdev); |
2196 | |
2197 | /* Clear pending interrupts. */ |
2198 | for (i = 0; i < atxdmac->dma.chancnt; i++) { |
2199 | atchan = &atxdmac->chan[i]; |
2200 | while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS)) |
2201 | cpu_relax(); |
2202 | } |
2203 | |
2204 | at_xdmac_write(atxdmac, AT_XDMAC_GIE, atxdmac->save_gim); |
2205 | list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { |
2206 | atchan = to_at_xdmac_chan(dchan: chan); |
2207 | |
2208 | at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->save_cc); |
2209 | if (at_xdmac_chan_is_cyclic(atchan)) { |
2210 | /* |
2211 | * Resume only channels not explicitly paused by |
2212 | * consumers. |
2213 | */ |
2214 | if (at_xdmac_chan_is_paused_internal(atchan)) { |
2215 | ret = at_xdmac_runtime_resume_descriptors(atchan); |
2216 | if (ret < 0) |
2217 | return ret; |
2218 | at_xdmac_device_resume_internal(atchan); |
2219 | } |
2220 | |
2221 | /* |
2222 | * We may resume from a deep sleep state where power |
2223 | * to DMA controller is cut-off. Thus, restore the |
2224 | * suspend state of channels set though dmaengine API. |
2225 | */ |
2226 | else if (at_xdmac_chan_is_paused(atchan)) |
2227 | at_xdmac_device_pause_set(atxdmac, atchan); |
2228 | |
2229 | at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda); |
2230 | at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc); |
2231 | at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim); |
2232 | wmb(); |
2233 | if (atxdmac->save_gs & atchan->mask) |
2234 | at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask); |
2235 | } |
2236 | } |
2237 | |
2238 | pm_runtime_mark_last_busy(dev: atxdmac->dev); |
2239 | pm_runtime_put_autosuspend(dev: atxdmac->dev); |
2240 | |
2241 | return 0; |
2242 | } |
2243 | |
2244 | static int __maybe_unused atmel_xdmac_runtime_suspend(struct device *dev) |
2245 | { |
2246 | struct at_xdmac *atxdmac = dev_get_drvdata(dev); |
2247 | |
2248 | clk_disable(clk: atxdmac->clk); |
2249 | |
2250 | return 0; |
2251 | } |
2252 | |
2253 | static int __maybe_unused atmel_xdmac_runtime_resume(struct device *dev) |
2254 | { |
2255 | struct at_xdmac *atxdmac = dev_get_drvdata(dev); |
2256 | |
2257 | return clk_enable(clk: atxdmac->clk); |
2258 | } |
2259 | |
2260 | static int at_xdmac_probe(struct platform_device *pdev) |
2261 | { |
2262 | struct at_xdmac *atxdmac; |
2263 | int irq, nr_channels, i, ret; |
2264 | void __iomem *base; |
2265 | u32 reg; |
2266 | |
2267 | irq = platform_get_irq(pdev, 0); |
2268 | if (irq < 0) |
2269 | return irq; |
2270 | |
2271 | base = devm_platform_ioremap_resource(pdev, index: 0); |
2272 | if (IS_ERR(ptr: base)) |
2273 | return PTR_ERR(ptr: base); |
2274 | |
2275 | /* |
2276 | * Read number of xdmac channels, read helper function can't be used |
2277 | * since atxdmac is not yet allocated and we need to know the number |
2278 | * of channels to do the allocation. |
2279 | */ |
2280 | reg = readl_relaxed(base + AT_XDMAC_GTYPE); |
2281 | nr_channels = AT_XDMAC_NB_CH(reg); |
2282 | if (nr_channels > AT_XDMAC_MAX_CHAN) { |
2283 | dev_err(&pdev->dev, "invalid number of channels (%u)\n" , |
2284 | nr_channels); |
2285 | return -EINVAL; |
2286 | } |
2287 | |
2288 | atxdmac = devm_kzalloc(dev: &pdev->dev, |
2289 | struct_size(atxdmac, chan, nr_channels), |
2290 | GFP_KERNEL); |
2291 | if (!atxdmac) { |
2292 | dev_err(&pdev->dev, "can't allocate at_xdmac structure\n" ); |
2293 | return -ENOMEM; |
2294 | } |
2295 | |
2296 | atxdmac->regs = base; |
2297 | atxdmac->irq = irq; |
2298 | atxdmac->dev = &pdev->dev; |
2299 | |
2300 | atxdmac->layout = of_device_get_match_data(dev: &pdev->dev); |
2301 | if (!atxdmac->layout) |
2302 | return -ENODEV; |
2303 | |
2304 | atxdmac->clk = devm_clk_get(dev: &pdev->dev, id: "dma_clk" ); |
2305 | if (IS_ERR(ptr: atxdmac->clk)) { |
2306 | dev_err(&pdev->dev, "can't get dma_clk\n" ); |
2307 | return PTR_ERR(ptr: atxdmac->clk); |
2308 | } |
2309 | |
2310 | /* Do not use dev res to prevent races with tasklet */ |
2311 | ret = request_irq(irq: atxdmac->irq, handler: at_xdmac_interrupt, flags: 0, name: "at_xdmac" , dev: atxdmac); |
2312 | if (ret) { |
2313 | dev_err(&pdev->dev, "can't request irq\n" ); |
2314 | return ret; |
2315 | } |
2316 | |
2317 | ret = clk_prepare_enable(clk: atxdmac->clk); |
2318 | if (ret) { |
2319 | dev_err(&pdev->dev, "can't prepare or enable clock\n" ); |
2320 | goto err_free_irq; |
2321 | } |
2322 | |
2323 | atxdmac->at_xdmac_desc_pool = |
2324 | dmam_pool_create(name: dev_name(dev: &pdev->dev), dev: &pdev->dev, |
2325 | size: sizeof(struct at_xdmac_desc), align: 4, allocation: 0); |
2326 | if (!atxdmac->at_xdmac_desc_pool) { |
2327 | dev_err(&pdev->dev, "no memory for descriptors dma pool\n" ); |
2328 | ret = -ENOMEM; |
2329 | goto err_clk_disable; |
2330 | } |
2331 | |
2332 | dma_cap_set(DMA_CYCLIC, atxdmac->dma.cap_mask); |
2333 | dma_cap_set(DMA_INTERLEAVE, atxdmac->dma.cap_mask); |
2334 | dma_cap_set(DMA_MEMCPY, atxdmac->dma.cap_mask); |
2335 | dma_cap_set(DMA_MEMSET, atxdmac->dma.cap_mask); |
2336 | dma_cap_set(DMA_MEMSET_SG, atxdmac->dma.cap_mask); |
2337 | dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask); |
2338 | /* |
2339 | * Without DMA_PRIVATE the driver is not able to allocate more than |
2340 | * one channel, second allocation fails in private_candidate. |
2341 | */ |
2342 | dma_cap_set(DMA_PRIVATE, atxdmac->dma.cap_mask); |
2343 | atxdmac->dma.dev = &pdev->dev; |
2344 | atxdmac->dma.device_alloc_chan_resources = at_xdmac_alloc_chan_resources; |
2345 | atxdmac->dma.device_free_chan_resources = at_xdmac_free_chan_resources; |
2346 | atxdmac->dma.device_tx_status = at_xdmac_tx_status; |
2347 | atxdmac->dma.device_issue_pending = at_xdmac_issue_pending; |
2348 | atxdmac->dma.device_prep_dma_cyclic = at_xdmac_prep_dma_cyclic; |
2349 | atxdmac->dma.device_prep_interleaved_dma = at_xdmac_prep_interleaved; |
2350 | atxdmac->dma.device_prep_dma_memcpy = at_xdmac_prep_dma_memcpy; |
2351 | atxdmac->dma.device_prep_dma_memset = at_xdmac_prep_dma_memset; |
2352 | atxdmac->dma.device_prep_dma_memset_sg = at_xdmac_prep_dma_memset_sg; |
2353 | atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg; |
2354 | atxdmac->dma.device_config = at_xdmac_device_config; |
2355 | atxdmac->dma.device_pause = at_xdmac_device_pause; |
2356 | atxdmac->dma.device_resume = at_xdmac_device_resume; |
2357 | atxdmac->dma.device_terminate_all = at_xdmac_device_terminate_all; |
2358 | atxdmac->dma.src_addr_widths = AT_XDMAC_DMA_BUSWIDTHS; |
2359 | atxdmac->dma.dst_addr_widths = AT_XDMAC_DMA_BUSWIDTHS; |
2360 | atxdmac->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); |
2361 | atxdmac->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; |
2362 | |
2363 | platform_set_drvdata(pdev, data: atxdmac); |
2364 | |
2365 | pm_runtime_set_autosuspend_delay(dev: &pdev->dev, delay: 500); |
2366 | pm_runtime_use_autosuspend(dev: &pdev->dev); |
2367 | pm_runtime_set_active(dev: &pdev->dev); |
2368 | pm_runtime_enable(dev: &pdev->dev); |
2369 | pm_runtime_get_noresume(dev: &pdev->dev); |
2370 | |
2371 | /* Init channels. */ |
2372 | INIT_LIST_HEAD(list: &atxdmac->dma.channels); |
2373 | |
2374 | /* Disable all chans and interrupts. */ |
2375 | at_xdmac_off(atxdmac, suspend_descriptors: true); |
2376 | |
2377 | for (i = 0; i < nr_channels; i++) { |
2378 | struct at_xdmac_chan *atchan = &atxdmac->chan[i]; |
2379 | |
2380 | atchan->chan.device = &atxdmac->dma; |
2381 | list_add_tail(new: &atchan->chan.device_node, |
2382 | head: &atxdmac->dma.channels); |
2383 | |
2384 | atchan->ch_regs = at_xdmac_chan_reg_base(atxdmac, chan_nb: i); |
2385 | atchan->mask = 1 << i; |
2386 | |
2387 | spin_lock_init(&atchan->lock); |
2388 | INIT_LIST_HEAD(list: &atchan->xfers_list); |
2389 | INIT_LIST_HEAD(list: &atchan->free_descs_list); |
2390 | tasklet_setup(t: &atchan->tasklet, callback: at_xdmac_tasklet); |
2391 | |
2392 | /* Clear pending interrupts. */ |
2393 | while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS)) |
2394 | cpu_relax(); |
2395 | } |
2396 | |
2397 | ret = dma_async_device_register(device: &atxdmac->dma); |
2398 | if (ret) { |
2399 | dev_err(&pdev->dev, "fail to register DMA engine device\n" ); |
2400 | goto err_pm_disable; |
2401 | } |
2402 | |
2403 | ret = of_dma_controller_register(np: pdev->dev.of_node, |
2404 | of_dma_xlate: at_xdmac_xlate, data: atxdmac); |
2405 | if (ret) { |
2406 | dev_err(&pdev->dev, "could not register of dma controller\n" ); |
2407 | goto err_dma_unregister; |
2408 | } |
2409 | |
2410 | dev_info(&pdev->dev, "%d channels, mapped at 0x%p\n" , |
2411 | nr_channels, atxdmac->regs); |
2412 | |
2413 | at_xdmac_axi_config(pdev); |
2414 | |
2415 | pm_runtime_mark_last_busy(dev: &pdev->dev); |
2416 | pm_runtime_put_autosuspend(dev: &pdev->dev); |
2417 | |
2418 | return 0; |
2419 | |
2420 | err_dma_unregister: |
2421 | dma_async_device_unregister(device: &atxdmac->dma); |
2422 | err_pm_disable: |
2423 | pm_runtime_put_noidle(dev: &pdev->dev); |
2424 | pm_runtime_disable(dev: &pdev->dev); |
2425 | pm_runtime_set_suspended(dev: &pdev->dev); |
2426 | pm_runtime_dont_use_autosuspend(dev: &pdev->dev); |
2427 | err_clk_disable: |
2428 | clk_disable_unprepare(clk: atxdmac->clk); |
2429 | err_free_irq: |
2430 | free_irq(atxdmac->irq, atxdmac); |
2431 | return ret; |
2432 | } |
2433 | |
2434 | static void at_xdmac_remove(struct platform_device *pdev) |
2435 | { |
2436 | struct at_xdmac *atxdmac = (struct at_xdmac *)platform_get_drvdata(pdev); |
2437 | int i; |
2438 | |
2439 | at_xdmac_off(atxdmac, suspend_descriptors: true); |
2440 | of_dma_controller_free(np: pdev->dev.of_node); |
2441 | dma_async_device_unregister(device: &atxdmac->dma); |
2442 | pm_runtime_disable(dev: atxdmac->dev); |
2443 | pm_runtime_set_suspended(dev: &pdev->dev); |
2444 | pm_runtime_dont_use_autosuspend(dev: &pdev->dev); |
2445 | clk_disable_unprepare(clk: atxdmac->clk); |
2446 | |
2447 | free_irq(atxdmac->irq, atxdmac); |
2448 | |
2449 | for (i = 0; i < atxdmac->dma.chancnt; i++) { |
2450 | struct at_xdmac_chan *atchan = &atxdmac->chan[i]; |
2451 | |
2452 | tasklet_kill(t: &atchan->tasklet); |
2453 | at_xdmac_free_chan_resources(chan: &atchan->chan); |
2454 | } |
2455 | } |
2456 | |
2457 | static const struct dev_pm_ops __maybe_unused atmel_xdmac_dev_pm_ops = { |
2458 | .prepare = atmel_xdmac_prepare, |
2459 | SET_LATE_SYSTEM_SLEEP_PM_OPS(atmel_xdmac_suspend, atmel_xdmac_resume) |
2460 | SET_RUNTIME_PM_OPS(atmel_xdmac_runtime_suspend, |
2461 | atmel_xdmac_runtime_resume, NULL) |
2462 | }; |
2463 | |
2464 | static const struct of_device_id atmel_xdmac_dt_ids[] = { |
2465 | { |
2466 | .compatible = "atmel,sama5d4-dma" , |
2467 | .data = &at_xdmac_sama5d4_layout, |
2468 | }, { |
2469 | .compatible = "microchip,sama7g5-dma" , |
2470 | .data = &at_xdmac_sama7g5_layout, |
2471 | }, { |
2472 | /* sentinel */ |
2473 | } |
2474 | }; |
2475 | MODULE_DEVICE_TABLE(of, atmel_xdmac_dt_ids); |
2476 | |
2477 | static struct platform_driver at_xdmac_driver = { |
2478 | .probe = at_xdmac_probe, |
2479 | .remove_new = at_xdmac_remove, |
2480 | .driver = { |
2481 | .name = "at_xdmac" , |
2482 | .of_match_table = of_match_ptr(atmel_xdmac_dt_ids), |
2483 | .pm = pm_ptr(&atmel_xdmac_dev_pm_ops), |
2484 | } |
2485 | }; |
2486 | |
2487 | static int __init at_xdmac_init(void) |
2488 | { |
2489 | return platform_driver_register(&at_xdmac_driver); |
2490 | } |
2491 | subsys_initcall(at_xdmac_init); |
2492 | |
2493 | static void __exit at_xdmac_exit(void) |
2494 | { |
2495 | platform_driver_unregister(&at_xdmac_driver); |
2496 | } |
2497 | module_exit(at_xdmac_exit); |
2498 | |
2499 | MODULE_DESCRIPTION("Atmel Extended DMA Controller driver" ); |
2500 | MODULE_AUTHOR("Ludovic Desroches <ludovic.desroches@atmel.com>" ); |
2501 | MODULE_LICENSE("GPL" ); |
2502 | |