2 * Driver for the Atmel Extensible DMA Controller (aka XDMAC on AT91 systems)
4 * Copyright (C) 2014 Atmel Corporation
6 * Author: Ludovic Desroches <ludovic.desroches@atmel.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 * You should have received a copy of the GNU General Public License along with
18 * this program. If not, see <http://www.gnu.org/licenses/>.
21 #include <asm/barrier.h>
22 #include <dt-bindings/dma/at91.h>
23 #include <linux/clk.h>
24 #include <linux/dmaengine.h>
25 #include <linux/dmapool.h>
26 #include <linux/interrupt.h>
27 #include <linux/irq.h>
28 #include <linux/kernel.h>
29 #include <linux/list.h>
30 #include <linux/module.h>
31 #include <linux/of_dma.h>
32 #include <linux/of_platform.h>
33 #include <linux/platform_device.h>
36 #include "dmaengine.h"
38 /* Global registers */
39 #define AT_XDMAC_GTYPE 0x00 /* Global Type Register */
40 #define AT_XDMAC_NB_CH(i) (((i) & 0x1F) + 1) /* Number of Channels Minus One */
41 #define AT_XDMAC_FIFO_SZ(i) (((i) >> 5) & 0x7FF) /* Number of Bytes */
42 #define AT_XDMAC_NB_REQ(i) ((((i) >> 16) & 0x3F) + 1) /* Number of Peripheral Requests Minus One */
43 #define AT_XDMAC_GCFG 0x04 /* Global Configuration Register */
44 #define AT_XDMAC_GWAC 0x08 /* Global Weighted Arbiter Configuration Register */
45 #define AT_XDMAC_GIE 0x0C /* Global Interrupt Enable Register */
46 #define AT_XDMAC_GID 0x10 /* Global Interrupt Disable Register */
47 #define AT_XDMAC_GIM 0x14 /* Global Interrupt Mask Register */
48 #define AT_XDMAC_GIS 0x18 /* Global Interrupt Status Register */
49 #define AT_XDMAC_GE 0x1C /* Global Channel Enable Register */
50 #define AT_XDMAC_GD 0x20 /* Global Channel Disable Register */
51 #define AT_XDMAC_GS 0x24 /* Global Channel Status Register */
52 #define AT_XDMAC_GRS 0x28 /* Global Channel Read Suspend Register */
53 #define AT_XDMAC_GWS 0x2C /* Global Write Suspend Register */
54 #define AT_XDMAC_GRWS 0x30 /* Global Channel Read Write Suspend Register */
55 #define AT_XDMAC_GRWR 0x34 /* Global Channel Read Write Resume Register */
56 #define AT_XDMAC_GSWR 0x38 /* Global Channel Software Request Register */
57 #define AT_XDMAC_GSWS 0x3C /* Global channel Software Request Status Register */
58 #define AT_XDMAC_GSWF 0x40 /* Global Channel Software Flush Request Register */
59 #define AT_XDMAC_VERSION 0xFFC /* XDMAC Version Register */
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_NDV0 (0x0 << 3) /* Channel x Next Descriptor View 0 */
104 #define AT_XDMAC_CNDC_NDVIEW_NDV1 (0x1 << 3) /* Channel x Next Descriptor View 1 */
105 #define AT_XDMAC_CNDC_NDVIEW_NDV2 (0x2 << 3) /* Channel x Next Descriptor View 2 */
106 #define AT_XDMAC_CNDC_NDVIEW_NDV3 (0x3 << 3) /* Channel x Next Descriptor View 3 */
107 #define AT_XDMAC_CUBC 0x20 /* Channel Microblock Control Register */
108 #define AT_XDMAC_CBC 0x24 /* Channel Block Control Register */
109 #define AT_XDMAC_CC 0x28 /* Channel Configuration Register */
110 #define AT_XDMAC_CC_TYPE (0x1 << 0) /* Channel Transfer Type */
111 #define AT_XDMAC_CC_TYPE_MEM_TRAN (0x0 << 0) /* Memory to Memory Transfer */
112 #define AT_XDMAC_CC_TYPE_PER_TRAN (0x1 << 0) /* Peripheral to Memory or Memory to Peripheral Transfer */
113 #define AT_XDMAC_CC_MBSIZE_MASK (0x3 << 1)
114 #define AT_XDMAC_CC_MBSIZE_SINGLE (0x0 << 1)
115 #define AT_XDMAC_CC_MBSIZE_FOUR (0x1 << 1)
116 #define AT_XDMAC_CC_MBSIZE_EIGHT (0x2 << 1)
117 #define AT_XDMAC_CC_MBSIZE_SIXTEEN (0x3 << 1)
118 #define AT_XDMAC_CC_DSYNC (0x1 << 4) /* Channel Synchronization */
119 #define AT_XDMAC_CC_DSYNC_PER2MEM (0x0 << 4)
120 #define AT_XDMAC_CC_DSYNC_MEM2PER (0x1 << 4)
121 #define AT_XDMAC_CC_PROT (0x1 << 5) /* Channel Protection */
122 #define AT_XDMAC_CC_PROT_SEC (0x0 << 5)
123 #define AT_XDMAC_CC_PROT_UNSEC (0x1 << 5)
124 #define AT_XDMAC_CC_SWREQ (0x1 << 6) /* Channel Software Request Trigger */
125 #define AT_XDMAC_CC_SWREQ_HWR_CONNECTED (0x0 << 6)
126 #define AT_XDMAC_CC_SWREQ_SWR_CONNECTED (0x1 << 6)
127 #define AT_XDMAC_CC_MEMSET (0x1 << 7) /* Channel Fill Block of memory */
128 #define AT_XDMAC_CC_MEMSET_NORMAL_MODE (0x0 << 7)
129 #define AT_XDMAC_CC_MEMSET_HW_MODE (0x1 << 7)
130 #define AT_XDMAC_CC_CSIZE(i) ((0x7 & (i)) << 8) /* Channel Chunk Size */
131 #define AT_XDMAC_CC_DWIDTH_OFFSET 11
132 #define AT_XDMAC_CC_DWIDTH_MASK (0x3 << AT_XDMAC_CC_DWIDTH_OFFSET)
133 #define AT_XDMAC_CC_DWIDTH(i) ((0x3 & (i)) << AT_XDMAC_CC_DWIDTH_OFFSET) /* Channel Data Width */
134 #define AT_XDMAC_CC_DWIDTH_BYTE 0x0
135 #define AT_XDMAC_CC_DWIDTH_HALFWORD 0x1
136 #define AT_XDMAC_CC_DWIDTH_WORD 0x2
137 #define AT_XDMAC_CC_DWIDTH_DWORD 0x3
138 #define AT_XDMAC_CC_SIF(i) ((0x1 & (i)) << 13) /* Channel Source Interface Identifier */
139 #define AT_XDMAC_CC_DIF(i) ((0x1 & (i)) << 14) /* Channel Destination Interface Identifier */
140 #define AT_XDMAC_CC_SAM_MASK (0x3 << 16) /* Channel Source Addressing Mode */
141 #define AT_XDMAC_CC_SAM_FIXED_AM (0x0 << 16)
142 #define AT_XDMAC_CC_SAM_INCREMENTED_AM (0x1 << 16)
143 #define AT_XDMAC_CC_SAM_UBS_AM (0x2 << 16)
144 #define AT_XDMAC_CC_SAM_UBS_DS_AM (0x3 << 16)
145 #define AT_XDMAC_CC_DAM_MASK (0x3 << 18) /* Channel Source Addressing Mode */
146 #define AT_XDMAC_CC_DAM_FIXED_AM (0x0 << 18)
147 #define AT_XDMAC_CC_DAM_INCREMENTED_AM (0x1 << 18)
148 #define AT_XDMAC_CC_DAM_UBS_AM (0x2 << 18)
149 #define AT_XDMAC_CC_DAM_UBS_DS_AM (0x3 << 18)
150 #define AT_XDMAC_CC_INITD (0x1 << 21) /* Channel Initialization Terminated (read only) */
151 #define AT_XDMAC_CC_INITD_TERMINATED (0x0 << 21)
152 #define AT_XDMAC_CC_INITD_IN_PROGRESS (0x1 << 21)
153 #define AT_XDMAC_CC_RDIP (0x1 << 22) /* Read in Progress (read only) */
154 #define AT_XDMAC_CC_RDIP_DONE (0x0 << 22)
155 #define AT_XDMAC_CC_RDIP_IN_PROGRESS (0x1 << 22)
156 #define AT_XDMAC_CC_WRIP (0x1 << 23) /* Write in Progress (read only) */
157 #define AT_XDMAC_CC_WRIP_DONE (0x0 << 23)
158 #define AT_XDMAC_CC_WRIP_IN_PROGRESS (0x1 << 23)
159 #define AT_XDMAC_CC_PERID(i) (0x7f & (h) << 24) /* Channel Peripheral Identifier */
160 #define AT_XDMAC_CDS_MSP 0x2C /* Channel Data Stride Memory Set Pattern */
161 #define AT_XDMAC_CSUS 0x30 /* Channel Source Microblock Stride */
162 #define AT_XDMAC_CDUS 0x34 /* Channel Destination Microblock Stride */
164 #define AT_XDMAC_CHAN_REG_BASE 0x50 /* Channel registers base address */
166 /* Microblock control members */
167 #define AT_XDMAC_MBR_UBC_UBLEN_MAX 0xFFFFFFUL /* Maximum Microblock Length */
168 #define AT_XDMAC_MBR_UBC_NDE (0x1 << 24) /* Next Descriptor Enable */
169 #define AT_XDMAC_MBR_UBC_NSEN (0x1 << 25) /* Next Descriptor Source Update */
170 #define AT_XDMAC_MBR_UBC_NDEN (0x1 << 26) /* Next Descriptor Destination Update */
171 #define AT_XDMAC_MBR_UBC_NDV0 (0x0 << 27) /* Next Descriptor View 0 */
172 #define AT_XDMAC_MBR_UBC_NDV1 (0x1 << 27) /* Next Descriptor View 1 */
173 #define AT_XDMAC_MBR_UBC_NDV2 (0x2 << 27) /* Next Descriptor View 2 */
174 #define AT_XDMAC_MBR_UBC_NDV3 (0x3 << 27) /* Next Descriptor View 3 */
176 #define AT_XDMAC_MAX_CHAN 0x20
177 #define AT_XDMAC_MAX_CSIZE 16 /* 16 data */
178 #define AT_XDMAC_MAX_DWIDTH 8 /* 64 bits */
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))
188 AT_XDMAC_CHAN_IS_CYCLIC = 0,
189 AT_XDMAC_CHAN_IS_PAUSED,
192 /* ----- Channels ----- */
193 struct at_xdmac_chan {
194 struct dma_chan chan;
195 void __iomem *ch_regs;
196 u32 mask; /* Channel Mask */
197 u32 cfg; /* Channel Configuration Register */
198 u8 perid; /* Peripheral ID */
199 u8 perif; /* Peripheral Interface */
200 u8 memif; /* Memory Interface */
205 unsigned long status;
206 struct tasklet_struct tasklet;
207 struct dma_slave_config sconfig;
211 struct list_head xfers_list;
212 struct list_head free_descs_list;
216 /* ----- Controller ----- */
218 struct dma_device dma;
224 struct dma_pool *at_xdmac_desc_pool;
225 struct at_xdmac_chan chan[0];
229 /* ----- Descriptors ----- */
231 /* Linked List Descriptor */
232 struct at_xdmac_lld {
233 dma_addr_t mbr_nda; /* Next Descriptor Member */
234 u32 mbr_ubc; /* Microblock Control Member */
235 dma_addr_t mbr_sa; /* Source Address Member */
236 dma_addr_t mbr_da; /* Destination Address Member */
237 u32 mbr_cfg; /* Configuration Register */
238 u32 mbr_bc; /* Block Control Register */
239 u32 mbr_ds; /* Data Stride Register */
240 u32 mbr_sus; /* Source Microblock Stride Register */
241 u32 mbr_dus; /* Destination Microblock Stride Register */
245 struct at_xdmac_desc {
246 struct at_xdmac_lld lld;
247 enum dma_transfer_direction direction;
248 struct dma_async_tx_descriptor tx_dma_desc;
249 struct list_head desc_node;
250 /* Following members are only used by the first descriptor */
252 unsigned int xfer_size;
253 struct list_head descs_list;
254 struct list_head xfer_node;
257 static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb)
259 return atxdmac->regs + (AT_XDMAC_CHAN_REG_BASE + chan_nb * 0x40);
262 #define at_xdmac_read(atxdmac, reg) readl_relaxed((atxdmac)->regs + (reg))
263 #define at_xdmac_write(atxdmac, reg, value) \
264 writel_relaxed((value), (atxdmac)->regs + (reg))
266 #define at_xdmac_chan_read(atchan, reg) readl_relaxed((atchan)->ch_regs + (reg))
267 #define at_xdmac_chan_write(atchan, reg, value) writel_relaxed((value), (atchan)->ch_regs + (reg))
269 static inline struct at_xdmac_chan *to_at_xdmac_chan(struct dma_chan *dchan)
271 return container_of(dchan, struct at_xdmac_chan, chan);
274 static struct device *chan2dev(struct dma_chan *chan)
276 return &chan->dev->device;
279 static inline struct at_xdmac *to_at_xdmac(struct dma_device *ddev)
281 return container_of(ddev, struct at_xdmac, dma);
284 static inline struct at_xdmac_desc *txd_to_at_desc(struct dma_async_tx_descriptor *txd)
286 return container_of(txd, struct at_xdmac_desc, tx_dma_desc);
289 static inline int at_xdmac_chan_is_cyclic(struct at_xdmac_chan *atchan)
291 return test_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status);
294 static inline int at_xdmac_chan_is_paused(struct at_xdmac_chan *atchan)
296 return test_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
299 static inline int at_xdmac_csize(u32 maxburst)
303 csize = ffs(maxburst) - 1;
310 static inline u8 at_xdmac_get_dwidth(u32 cfg)
312 return (cfg & AT_XDMAC_CC_DWIDTH_MASK) >> AT_XDMAC_CC_DWIDTH_OFFSET;
315 static unsigned int init_nr_desc_per_channel = 64;
316 module_param(init_nr_desc_per_channel, uint, 0644);
317 MODULE_PARM_DESC(init_nr_desc_per_channel,
318 "initial descriptors per channel (default: 64)");
321 static bool at_xdmac_chan_is_enabled(struct at_xdmac_chan *atchan)
323 return at_xdmac_chan_read(atchan, AT_XDMAC_GS) & atchan->mask;
326 static void at_xdmac_off(struct at_xdmac *atxdmac)
328 at_xdmac_write(atxdmac, AT_XDMAC_GD, -1L);
330 /* Wait that all chans are disabled. */
331 while (at_xdmac_read(atxdmac, AT_XDMAC_GS))
334 at_xdmac_write(atxdmac, AT_XDMAC_GID, -1L);
337 /* Call with lock hold. */
338 static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan,
339 struct at_xdmac_desc *first)
341 struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
344 dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, first);
346 if (at_xdmac_chan_is_enabled(atchan))
349 /* Set transfer as active to not try to start it again. */
350 first->active_xfer = true;
352 /* Tell xdmac where to get the first descriptor. */
353 reg = AT_XDMAC_CNDA_NDA(first->tx_dma_desc.phys)
354 | AT_XDMAC_CNDA_NDAIF(atchan->memif);
355 at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, reg);
358 * When doing non cyclic transfer we need to use the next
359 * descriptor view 2 since some fields of the configuration register
360 * depend on transfer size and src/dest addresses.
362 if (at_xdmac_chan_is_cyclic(atchan))
363 reg = AT_XDMAC_CNDC_NDVIEW_NDV1;
364 else if (first->lld.mbr_ubc & AT_XDMAC_MBR_UBC_NDV3)
365 reg = AT_XDMAC_CNDC_NDVIEW_NDV3;
367 reg = AT_XDMAC_CNDC_NDVIEW_NDV2;
369 * Even if the register will be updated from the configuration in the
370 * descriptor when using view 2 or higher, the PROT bit won't be set
371 * properly. This bit can be modified only by using the channel
372 * configuration register.
374 at_xdmac_chan_write(atchan, AT_XDMAC_CC, first->lld.mbr_cfg);
376 reg |= AT_XDMAC_CNDC_NDDUP
377 | AT_XDMAC_CNDC_NDSUP
379 at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, reg);
381 dev_vdbg(chan2dev(&atchan->chan),
382 "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n",
383 __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC),
384 at_xdmac_chan_read(atchan, AT_XDMAC_CNDA),
385 at_xdmac_chan_read(atchan, AT_XDMAC_CNDC),
386 at_xdmac_chan_read(atchan, AT_XDMAC_CSA),
387 at_xdmac_chan_read(atchan, AT_XDMAC_CDA),
388 at_xdmac_chan_read(atchan, AT_XDMAC_CUBC));
390 at_xdmac_chan_write(atchan, AT_XDMAC_CID, 0xffffffff);
391 reg = AT_XDMAC_CIE_RBEIE | AT_XDMAC_CIE_WBEIE | AT_XDMAC_CIE_ROIE;
393 * There is no end of list when doing cyclic dma, we need to get
394 * an interrupt after each periods.
396 if (at_xdmac_chan_is_cyclic(atchan))
397 at_xdmac_chan_write(atchan, AT_XDMAC_CIE,
398 reg | AT_XDMAC_CIE_BIE);
400 at_xdmac_chan_write(atchan, AT_XDMAC_CIE,
401 reg | AT_XDMAC_CIE_LIE);
402 at_xdmac_write(atxdmac, AT_XDMAC_GIE, atchan->mask);
403 dev_vdbg(chan2dev(&atchan->chan),
404 "%s: enable channel (0x%08x)\n", __func__, atchan->mask);
406 at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask);
408 dev_vdbg(chan2dev(&atchan->chan),
409 "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n",
410 __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC),
411 at_xdmac_chan_read(atchan, AT_XDMAC_CNDA),
412 at_xdmac_chan_read(atchan, AT_XDMAC_CNDC),
413 at_xdmac_chan_read(atchan, AT_XDMAC_CSA),
414 at_xdmac_chan_read(atchan, AT_XDMAC_CDA),
415 at_xdmac_chan_read(atchan, AT_XDMAC_CUBC));
419 static dma_cookie_t at_xdmac_tx_submit(struct dma_async_tx_descriptor *tx)
421 struct at_xdmac_desc *desc = txd_to_at_desc(tx);
422 struct at_xdmac_chan *atchan = to_at_xdmac_chan(tx->chan);
424 unsigned long irqflags;
426 spin_lock_irqsave(&atchan->lock, irqflags);
427 cookie = dma_cookie_assign(tx);
429 dev_vdbg(chan2dev(tx->chan), "%s: atchan 0x%p, add desc 0x%p to xfers_list\n",
430 __func__, atchan, desc);
431 list_add_tail(&desc->xfer_node, &atchan->xfers_list);
432 if (list_is_singular(&atchan->xfers_list))
433 at_xdmac_start_xfer(atchan, desc);
435 spin_unlock_irqrestore(&atchan->lock, irqflags);
439 static struct at_xdmac_desc *at_xdmac_alloc_desc(struct dma_chan *chan,
442 struct at_xdmac_desc *desc;
443 struct at_xdmac *atxdmac = to_at_xdmac(chan->device);
446 desc = dma_pool_alloc(atxdmac->at_xdmac_desc_pool, gfp_flags, &phys);
448 memset(desc, 0, sizeof(*desc));
449 INIT_LIST_HEAD(&desc->descs_list);
450 dma_async_tx_descriptor_init(&desc->tx_dma_desc, chan);
451 desc->tx_dma_desc.tx_submit = at_xdmac_tx_submit;
452 desc->tx_dma_desc.phys = phys;
458 /* Call must be protected by lock. */
459 static struct at_xdmac_desc *at_xdmac_get_desc(struct at_xdmac_chan *atchan)
461 struct at_xdmac_desc *desc;
463 if (list_empty(&atchan->free_descs_list)) {
464 desc = at_xdmac_alloc_desc(&atchan->chan, GFP_NOWAIT);
466 desc = list_first_entry(&atchan->free_descs_list,
467 struct at_xdmac_desc, desc_node);
468 list_del(&desc->desc_node);
469 desc->active_xfer = false;
475 static void at_xdmac_queue_desc(struct dma_chan *chan,
476 struct at_xdmac_desc *prev,
477 struct at_xdmac_desc *desc)
482 prev->lld.mbr_nda = desc->tx_dma_desc.phys;
483 prev->lld.mbr_ubc |= AT_XDMAC_MBR_UBC_NDE;
485 dev_dbg(chan2dev(chan), "%s: chain lld: prev=0x%p, mbr_nda=%pad\n",
486 __func__, prev, &prev->lld.mbr_nda);
489 static inline void at_xdmac_increment_block_count(struct dma_chan *chan,
490 struct at_xdmac_desc *desc)
497 dev_dbg(chan2dev(chan),
498 "%s: incrementing the block count of the desc 0x%p\n",
502 static struct dma_chan *at_xdmac_xlate(struct of_phandle_args *dma_spec,
503 struct of_dma *of_dma)
505 struct at_xdmac *atxdmac = of_dma->of_dma_data;
506 struct at_xdmac_chan *atchan;
507 struct dma_chan *chan;
508 struct device *dev = atxdmac->dma.dev;
510 if (dma_spec->args_count != 1) {
511 dev_err(dev, "dma phandler args: bad number of args\n");
515 chan = dma_get_any_slave_channel(&atxdmac->dma);
517 dev_err(dev, "can't get a dma channel\n");
521 atchan = to_at_xdmac_chan(chan);
522 atchan->memif = AT91_XDMAC_DT_GET_MEM_IF(dma_spec->args[0]);
523 atchan->perif = AT91_XDMAC_DT_GET_PER_IF(dma_spec->args[0]);
524 atchan->perid = AT91_XDMAC_DT_GET_PERID(dma_spec->args[0]);
525 dev_dbg(dev, "chan dt cfg: memif=%u perif=%u perid=%u\n",
526 atchan->memif, atchan->perif, atchan->perid);
531 static int at_xdmac_compute_chan_conf(struct dma_chan *chan,
532 enum dma_transfer_direction direction)
534 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
537 if (direction == DMA_DEV_TO_MEM) {
539 AT91_XDMAC_DT_PERID(atchan->perid)
540 | AT_XDMAC_CC_DAM_INCREMENTED_AM
541 | AT_XDMAC_CC_SAM_FIXED_AM
542 | AT_XDMAC_CC_DIF(atchan->memif)
543 | AT_XDMAC_CC_SIF(atchan->perif)
544 | AT_XDMAC_CC_SWREQ_HWR_CONNECTED
545 | AT_XDMAC_CC_DSYNC_PER2MEM
546 | AT_XDMAC_CC_MBSIZE_SIXTEEN
547 | AT_XDMAC_CC_TYPE_PER_TRAN;
548 csize = ffs(atchan->sconfig.src_maxburst) - 1;
550 dev_err(chan2dev(chan), "invalid src maxburst value\n");
553 atchan->cfg |= AT_XDMAC_CC_CSIZE(csize);
554 dwidth = ffs(atchan->sconfig.src_addr_width) - 1;
556 dev_err(chan2dev(chan), "invalid src addr width value\n");
559 atchan->cfg |= AT_XDMAC_CC_DWIDTH(dwidth);
560 } else if (direction == DMA_MEM_TO_DEV) {
562 AT91_XDMAC_DT_PERID(atchan->perid)
563 | AT_XDMAC_CC_DAM_FIXED_AM
564 | AT_XDMAC_CC_SAM_INCREMENTED_AM
565 | AT_XDMAC_CC_DIF(atchan->perif)
566 | AT_XDMAC_CC_SIF(atchan->memif)
567 | AT_XDMAC_CC_SWREQ_HWR_CONNECTED
568 | AT_XDMAC_CC_DSYNC_MEM2PER
569 | AT_XDMAC_CC_MBSIZE_SIXTEEN
570 | AT_XDMAC_CC_TYPE_PER_TRAN;
571 csize = ffs(atchan->sconfig.dst_maxburst) - 1;
573 dev_err(chan2dev(chan), "invalid src maxburst value\n");
576 atchan->cfg |= AT_XDMAC_CC_CSIZE(csize);
577 dwidth = ffs(atchan->sconfig.dst_addr_width) - 1;
579 dev_err(chan2dev(chan), "invalid dst addr width value\n");
582 atchan->cfg |= AT_XDMAC_CC_DWIDTH(dwidth);
585 dev_dbg(chan2dev(chan), "%s: cfg=0x%08x\n", __func__, atchan->cfg);
591 * Only check that maxburst and addr width values are supported by the
592 * the controller but not that the configuration is good to perform the
593 * transfer since we don't know the direction at this stage.
595 static int at_xdmac_check_slave_config(struct dma_slave_config *sconfig)
597 if ((sconfig->src_maxburst > AT_XDMAC_MAX_CSIZE)
598 || (sconfig->dst_maxburst > AT_XDMAC_MAX_CSIZE))
601 if ((sconfig->src_addr_width > AT_XDMAC_MAX_DWIDTH)
602 || (sconfig->dst_addr_width > AT_XDMAC_MAX_DWIDTH))
608 static int at_xdmac_set_slave_config(struct dma_chan *chan,
609 struct dma_slave_config *sconfig)
611 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
613 if (at_xdmac_check_slave_config(sconfig)) {
614 dev_err(chan2dev(chan), "invalid slave configuration\n");
618 memcpy(&atchan->sconfig, sconfig, sizeof(atchan->sconfig));
623 static struct dma_async_tx_descriptor *
624 at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
625 unsigned int sg_len, enum dma_transfer_direction direction,
626 unsigned long flags, void *context)
628 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
629 struct at_xdmac_desc *first = NULL, *prev = NULL;
630 struct scatterlist *sg;
632 unsigned int xfer_size = 0;
633 unsigned long irqflags;
634 struct dma_async_tx_descriptor *ret = NULL;
639 if (!is_slave_direction(direction)) {
640 dev_err(chan2dev(chan), "invalid DMA direction\n");
644 dev_dbg(chan2dev(chan), "%s: sg_len=%d, dir=%s, flags=0x%lx\n",
646 direction == DMA_MEM_TO_DEV ? "to device" : "from device",
649 /* Protect dma_sconfig field that can be modified by set_slave_conf. */
650 spin_lock_irqsave(&atchan->lock, irqflags);
652 if (at_xdmac_compute_chan_conf(chan, direction))
655 /* Prepare descriptors. */
656 for_each_sg(sgl, sg, sg_len, i) {
657 struct at_xdmac_desc *desc = NULL;
658 u32 len, mem, dwidth, fixed_dwidth;
660 len = sg_dma_len(sg);
661 mem = sg_dma_address(sg);
662 if (unlikely(!len)) {
663 dev_err(chan2dev(chan), "sg data length is zero\n");
666 dev_dbg(chan2dev(chan), "%s: * sg%d len=%u, mem=0x%08x\n",
667 __func__, i, len, mem);
669 desc = at_xdmac_get_desc(atchan);
671 dev_err(chan2dev(chan), "can't get descriptor\n");
673 list_splice_init(&first->descs_list, &atchan->free_descs_list);
677 /* Linked list descriptor setup. */
678 if (direction == DMA_DEV_TO_MEM) {
679 desc->lld.mbr_sa = atchan->sconfig.src_addr;
680 desc->lld.mbr_da = mem;
682 desc->lld.mbr_sa = mem;
683 desc->lld.mbr_da = atchan->sconfig.dst_addr;
685 desc->lld.mbr_cfg = atchan->cfg;
686 dwidth = at_xdmac_get_dwidth(desc->lld.mbr_cfg);
687 fixed_dwidth = IS_ALIGNED(len, 1 << dwidth)
688 ? at_xdmac_get_dwidth(desc->lld.mbr_cfg)
689 : AT_XDMAC_CC_DWIDTH_BYTE;
690 desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2 /* next descriptor view */
691 | AT_XDMAC_MBR_UBC_NDEN /* next descriptor dst parameter update */
692 | AT_XDMAC_MBR_UBC_NSEN /* next descriptor src parameter update */
693 | (len >> fixed_dwidth); /* microblock length */
694 dev_dbg(chan2dev(chan),
695 "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n",
696 __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc);
700 at_xdmac_queue_desc(chan, prev, desc);
706 dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
707 __func__, desc, first);
708 list_add_tail(&desc->desc_node, &first->descs_list);
713 first->tx_dma_desc.flags = flags;
714 first->xfer_size = xfer_size;
715 first->direction = direction;
716 ret = &first->tx_dma_desc;
719 spin_unlock_irqrestore(&atchan->lock, irqflags);
723 static struct dma_async_tx_descriptor *
724 at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,
725 size_t buf_len, size_t period_len,
726 enum dma_transfer_direction direction,
729 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
730 struct at_xdmac_desc *first = NULL, *prev = NULL;
731 unsigned int periods = buf_len / period_len;
733 unsigned long irqflags;
735 dev_dbg(chan2dev(chan), "%s: buf_addr=%pad, buf_len=%zd, period_len=%zd, dir=%s, flags=0x%lx\n",
736 __func__, &buf_addr, buf_len, period_len,
737 direction == DMA_MEM_TO_DEV ? "mem2per" : "per2mem", flags);
739 if (!is_slave_direction(direction)) {
740 dev_err(chan2dev(chan), "invalid DMA direction\n");
744 if (test_and_set_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status)) {
745 dev_err(chan2dev(chan), "channel currently used\n");
749 if (at_xdmac_compute_chan_conf(chan, direction))
752 for (i = 0; i < periods; i++) {
753 struct at_xdmac_desc *desc = NULL;
755 spin_lock_irqsave(&atchan->lock, irqflags);
756 desc = at_xdmac_get_desc(atchan);
758 dev_err(chan2dev(chan), "can't get descriptor\n");
760 list_splice_init(&first->descs_list, &atchan->free_descs_list);
761 spin_unlock_irqrestore(&atchan->lock, irqflags);
764 spin_unlock_irqrestore(&atchan->lock, irqflags);
765 dev_dbg(chan2dev(chan),
766 "%s: desc=0x%p, tx_dma_desc.phys=%pad\n",
767 __func__, desc, &desc->tx_dma_desc.phys);
769 if (direction == DMA_DEV_TO_MEM) {
770 desc->lld.mbr_sa = atchan->sconfig.src_addr;
771 desc->lld.mbr_da = buf_addr + i * period_len;
773 desc->lld.mbr_sa = buf_addr + i * period_len;
774 desc->lld.mbr_da = atchan->sconfig.dst_addr;
776 desc->lld.mbr_cfg = atchan->cfg;
777 desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1
778 | AT_XDMAC_MBR_UBC_NDEN
779 | AT_XDMAC_MBR_UBC_NSEN
780 | period_len >> at_xdmac_get_dwidth(desc->lld.mbr_cfg);
782 dev_dbg(chan2dev(chan),
783 "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n",
784 __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc);
788 at_xdmac_queue_desc(chan, prev, desc);
794 dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
795 __func__, desc, first);
796 list_add_tail(&desc->desc_node, &first->descs_list);
799 prev->lld.mbr_nda = first->tx_dma_desc.phys;
800 dev_dbg(chan2dev(chan),
801 "%s: chain lld: prev=0x%p, mbr_nda=%pad\n",
802 __func__, prev, &prev->lld.mbr_nda);
803 first->tx_dma_desc.flags = flags;
804 first->xfer_size = buf_len;
805 first->direction = direction;
807 return &first->tx_dma_desc;
810 static inline u32 at_xdmac_align_width(struct dma_chan *chan, dma_addr_t addr)
815 * Check address alignment to select the greater data width we
818 * Some XDMAC implementations don't provide dword transfer, in
819 * this case selecting dword has the same behavior as
820 * selecting word transfers.
823 width = AT_XDMAC_CC_DWIDTH_DWORD;
824 dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__);
825 } else if (!(addr & 3)) {
826 width = AT_XDMAC_CC_DWIDTH_WORD;
827 dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__);
828 } else if (!(addr & 1)) {
829 width = AT_XDMAC_CC_DWIDTH_HALFWORD;
830 dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__);
832 width = AT_XDMAC_CC_DWIDTH_BYTE;
833 dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__);
839 static struct at_xdmac_desc *
840 at_xdmac_interleaved_queue_desc(struct dma_chan *chan,
841 struct at_xdmac_chan *atchan,
842 struct at_xdmac_desc *prev,
843 dma_addr_t src, dma_addr_t dst,
844 struct dma_interleaved_template *xt,
845 struct data_chunk *chunk)
847 struct at_xdmac_desc *desc;
852 * WARNING: The channel configuration is set here since there is no
853 * dmaengine_slave_config call in this case. Moreover we don't know the
854 * direction, it involves we can't dynamically set the source and dest
855 * interface so we have to use the same one. Only interface 0 allows EBI
856 * access. Hopefully we can access DDR through both ports (at least on
857 * SAMA5D4x), so we can use the same interface for source and dest,
858 * that solves the fact we don't know the direction.
860 u32 chan_cc = AT_XDMAC_CC_DIF(0)
862 | AT_XDMAC_CC_MBSIZE_SIXTEEN
863 | AT_XDMAC_CC_TYPE_MEM_TRAN;
865 dwidth = at_xdmac_align_width(chan, src | dst | chunk->size);
866 if (chunk->size >= (AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)) {
867 dev_dbg(chan2dev(chan),
868 "%s: chunk too big (%d, max size %lu)...\n",
869 __func__, chunk->size,
870 AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth);
875 dev_dbg(chan2dev(chan),
876 "Adding items at the end of desc 0x%p\n", prev);
880 chan_cc |= AT_XDMAC_CC_SAM_UBS_DS_AM;
882 chan_cc |= AT_XDMAC_CC_SAM_INCREMENTED_AM;
887 chan_cc |= AT_XDMAC_CC_DAM_UBS_DS_AM;
889 chan_cc |= AT_XDMAC_CC_DAM_INCREMENTED_AM;
892 spin_lock_irqsave(&atchan->lock, flags);
893 desc = at_xdmac_get_desc(atchan);
894 spin_unlock_irqrestore(&atchan->lock, flags);
896 dev_err(chan2dev(chan), "can't get descriptor\n");
900 chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
902 ublen = chunk->size >> dwidth;
904 desc->lld.mbr_sa = src;
905 desc->lld.mbr_da = dst;
906 desc->lld.mbr_sus = dmaengine_get_src_icg(xt, chunk);
907 desc->lld.mbr_dus = dmaengine_get_dst_icg(xt, chunk);
909 desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV3
910 | AT_XDMAC_MBR_UBC_NDEN
911 | AT_XDMAC_MBR_UBC_NSEN
913 desc->lld.mbr_cfg = chan_cc;
915 dev_dbg(chan2dev(chan),
916 "%s: lld: mbr_sa=0x%08x, mbr_da=0x%08x, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n",
917 __func__, desc->lld.mbr_sa, desc->lld.mbr_da,
918 desc->lld.mbr_ubc, desc->lld.mbr_cfg);
922 at_xdmac_queue_desc(chan, prev, desc);
927 static struct dma_async_tx_descriptor *
928 at_xdmac_prep_interleaved(struct dma_chan *chan,
929 struct dma_interleaved_template *xt,
932 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
933 struct at_xdmac_desc *prev = NULL, *first = NULL;
934 struct data_chunk *chunk, *prev_chunk = NULL;
935 dma_addr_t dst_addr, src_addr;
936 size_t dst_skip, src_skip, len = 0;
937 size_t prev_dst_icg = 0, prev_src_icg = 0;
940 if (!xt || (xt->numf != 1) || (xt->dir != DMA_MEM_TO_MEM))
943 dev_dbg(chan2dev(chan), "%s: src=0x%08x, dest=0x%08x, numf=%d, frame_size=%d, flags=0x%lx\n",
944 __func__, xt->src_start, xt->dst_start, xt->numf,
945 xt->frame_size, flags);
947 src_addr = xt->src_start;
948 dst_addr = xt->dst_start;
950 for (i = 0; i < xt->frame_size; i++) {
951 struct at_xdmac_desc *desc;
952 size_t src_icg, dst_icg;
956 dst_icg = dmaengine_get_dst_icg(xt, chunk);
957 src_icg = dmaengine_get_src_icg(xt, chunk);
959 src_skip = chunk->size + src_icg;
960 dst_skip = chunk->size + dst_icg;
962 dev_dbg(chan2dev(chan),
963 "%s: chunk size=%d, src icg=%d, dst icg=%d\n",
964 __func__, chunk->size, src_icg, dst_icg);
967 * Handle the case where we just have the same
968 * transfer to setup, we can just increase the
969 * block number and reuse the same descriptor.
971 if (prev_chunk && prev &&
972 (prev_chunk->size == chunk->size) &&
973 (prev_src_icg == src_icg) &&
974 (prev_dst_icg == dst_icg)) {
975 dev_dbg(chan2dev(chan),
976 "%s: same configuration that the previous chunk, merging the descriptors...\n",
978 at_xdmac_increment_block_count(chan, prev);
982 desc = at_xdmac_interleaved_queue_desc(chan, atchan,
987 list_splice_init(&first->descs_list,
988 &atchan->free_descs_list);
995 dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
996 __func__, desc, first);
997 list_add_tail(&desc->desc_node, &first->descs_list);
1000 src_addr += src_skip;
1003 dst_addr += dst_skip;
1007 prev_dst_icg = dst_icg;
1008 prev_src_icg = src_icg;
1012 first->tx_dma_desc.cookie = -EBUSY;
1013 first->tx_dma_desc.flags = flags;
1014 first->xfer_size = len;
1016 return &first->tx_dma_desc;
1019 static struct dma_async_tx_descriptor *
1020 at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1021 size_t len, unsigned long flags)
1023 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1024 struct at_xdmac_desc *first = NULL, *prev = NULL;
1025 size_t remaining_size = len, xfer_size = 0, ublen;
1026 dma_addr_t src_addr = src, dst_addr = dest;
1029 * WARNING: We don't know the direction, it involves we can't
1030 * dynamically set the source and dest interface so we have to use the
1031 * same one. Only interface 0 allows EBI access. Hopefully we can
1032 * access DDR through both ports (at least on SAMA5D4x), so we can use
1033 * the same interface for source and dest, that solves the fact we
1034 * don't know the direction.
1036 u32 chan_cc = AT_XDMAC_CC_DAM_INCREMENTED_AM
1037 | AT_XDMAC_CC_SAM_INCREMENTED_AM
1038 | AT_XDMAC_CC_DIF(0)
1039 | AT_XDMAC_CC_SIF(0)
1040 | AT_XDMAC_CC_MBSIZE_SIXTEEN
1041 | AT_XDMAC_CC_TYPE_MEM_TRAN;
1042 unsigned long irqflags;
1044 dev_dbg(chan2dev(chan), "%s: src=%pad, dest=%pad, len=%zd, flags=0x%lx\n",
1045 __func__, &src, &dest, len, flags);
1050 dwidth = at_xdmac_align_width(chan, src_addr | dst_addr);
1052 /* Prepare descriptors. */
1053 while (remaining_size) {
1054 struct at_xdmac_desc *desc = NULL;
1056 dev_dbg(chan2dev(chan), "%s: remaining_size=%zu\n", __func__, remaining_size);
1058 spin_lock_irqsave(&atchan->lock, irqflags);
1059 desc = at_xdmac_get_desc(atchan);
1060 spin_unlock_irqrestore(&atchan->lock, irqflags);
1062 dev_err(chan2dev(chan), "can't get descriptor\n");
1064 list_splice_init(&first->descs_list, &atchan->free_descs_list);
1068 /* Update src and dest addresses. */
1069 src_addr += xfer_size;
1070 dst_addr += xfer_size;
1072 if (remaining_size >= AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)
1073 xfer_size = AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth;
1075 xfer_size = remaining_size;
1077 dev_dbg(chan2dev(chan), "%s: xfer_size=%zu\n", __func__, xfer_size);
1079 /* Check remaining length and change data width if needed. */
1080 dwidth = at_xdmac_align_width(chan,
1081 src_addr | dst_addr | xfer_size);
1082 chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
1084 ublen = xfer_size >> dwidth;
1085 remaining_size -= xfer_size;
1087 desc->lld.mbr_sa = src_addr;
1088 desc->lld.mbr_da = dst_addr;
1089 desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2
1090 | AT_XDMAC_MBR_UBC_NDEN
1091 | AT_XDMAC_MBR_UBC_NSEN
1093 desc->lld.mbr_cfg = chan_cc;
1095 dev_dbg(chan2dev(chan),
1096 "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n",
1097 __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc, desc->lld.mbr_cfg);
1101 at_xdmac_queue_desc(chan, prev, desc);
1107 dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
1108 __func__, desc, first);
1109 list_add_tail(&desc->desc_node, &first->descs_list);
1112 first->tx_dma_desc.flags = flags;
1113 first->xfer_size = len;
1115 return &first->tx_dma_desc;
1118 static struct at_xdmac_desc *at_xdmac_memset_create_desc(struct dma_chan *chan,
1119 struct at_xdmac_chan *atchan,
1120 dma_addr_t dst_addr,
1124 struct at_xdmac_desc *desc;
1125 unsigned long flags;
1129 * WARNING: The channel configuration is set here since there is no
1130 * dmaengine_slave_config call in this case. Moreover we don't know the
1131 * direction, it involves we can't dynamically set the source and dest
1132 * interface so we have to use the same one. Only interface 0 allows EBI
1133 * access. Hopefully we can access DDR through both ports (at least on
1134 * SAMA5D4x), so we can use the same interface for source and dest,
1135 * that solves the fact we don't know the direction.
1137 u32 chan_cc = AT_XDMAC_CC_DAM_INCREMENTED_AM
1138 | AT_XDMAC_CC_SAM_INCREMENTED_AM
1139 | AT_XDMAC_CC_DIF(0)
1140 | AT_XDMAC_CC_SIF(0)
1141 | AT_XDMAC_CC_MBSIZE_SIXTEEN
1142 | AT_XDMAC_CC_MEMSET_HW_MODE
1143 | AT_XDMAC_CC_TYPE_MEM_TRAN;
1145 dwidth = at_xdmac_align_width(chan, dst_addr);
1147 if (len >= (AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)) {
1148 dev_err(chan2dev(chan),
1149 "%s: Transfer too large, aborting...\n",
1154 spin_lock_irqsave(&atchan->lock, flags);
1155 desc = at_xdmac_get_desc(atchan);
1156 spin_unlock_irqrestore(&atchan->lock, flags);
1158 dev_err(chan2dev(chan), "can't get descriptor\n");
1162 chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
1164 ublen = len >> dwidth;
1166 desc->lld.mbr_da = dst_addr;
1167 desc->lld.mbr_ds = value;
1168 desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV3
1169 | AT_XDMAC_MBR_UBC_NDEN
1170 | AT_XDMAC_MBR_UBC_NSEN
1172 desc->lld.mbr_cfg = chan_cc;
1174 dev_dbg(chan2dev(chan),
1175 "%s: lld: mbr_da=0x%08x, mbr_ds=0x%08x, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n",
1176 __func__, desc->lld.mbr_da, desc->lld.mbr_ds, desc->lld.mbr_ubc,
1182 struct dma_async_tx_descriptor *
1183 at_xdmac_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
1184 size_t len, unsigned long flags)
1186 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1187 struct at_xdmac_desc *desc;
1189 dev_dbg(chan2dev(chan), "%s: dest=0x%08x, len=%d, pattern=0x%x, flags=0x%lx\n",
1190 __func__, dest, len, value, flags);
1195 desc = at_xdmac_memset_create_desc(chan, atchan, dest, len, value);
1196 list_add_tail(&desc->desc_node, &desc->descs_list);
1198 desc->tx_dma_desc.cookie = -EBUSY;
1199 desc->tx_dma_desc.flags = flags;
1200 desc->xfer_size = len;
1202 return &desc->tx_dma_desc;
1205 static enum dma_status
1206 at_xdmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
1207 struct dma_tx_state *txstate)
1209 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1210 struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
1211 struct at_xdmac_desc *desc, *_desc;
1212 struct list_head *descs_list;
1213 enum dma_status ret;
1215 u32 cur_nda, mask, value;
1217 unsigned long flags;
1219 ret = dma_cookie_status(chan, cookie, txstate);
1220 if (ret == DMA_COMPLETE)
1226 spin_lock_irqsave(&atchan->lock, flags);
1228 desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node);
1231 * If the transfer has not been started yet, don't need to compute the
1232 * residue, it's the transfer length.
1234 if (!desc->active_xfer) {
1235 dma_set_residue(txstate, desc->xfer_size);
1239 residue = desc->xfer_size;
1241 * Flush FIFO: only relevant when the transfer is source peripheral
1244 mask = AT_XDMAC_CC_TYPE | AT_XDMAC_CC_DSYNC;
1245 value = AT_XDMAC_CC_TYPE_PER_TRAN | AT_XDMAC_CC_DSYNC_PER2MEM;
1246 if ((desc->lld.mbr_cfg & mask) == value) {
1247 at_xdmac_write(atxdmac, AT_XDMAC_GSWF, atchan->mask);
1248 while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS))
1252 cur_nda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA) & 0xfffffffc;
1254 * Remove size of all microblocks already transferred and the current
1255 * one. Then add the remaining size to transfer of the current
1258 descs_list = &desc->descs_list;
1259 list_for_each_entry_safe(desc, _desc, descs_list, desc_node) {
1260 dwidth = at_xdmac_get_dwidth(desc->lld.mbr_cfg);
1261 residue -= (desc->lld.mbr_ubc & 0xffffff) << dwidth;
1262 if ((desc->lld.mbr_nda & 0xfffffffc) == cur_nda)
1265 residue += at_xdmac_chan_read(atchan, AT_XDMAC_CUBC) << dwidth;
1267 dma_set_residue(txstate, residue);
1269 dev_dbg(chan2dev(chan),
1270 "%s: desc=0x%p, tx_dma_desc.phys=%pad, tx_status=%d, cookie=%d, residue=%d\n",
1271 __func__, desc, &desc->tx_dma_desc.phys, ret, cookie, residue);
1274 spin_unlock_irqrestore(&atchan->lock, flags);
1278 /* Call must be protected by lock. */
1279 static void at_xdmac_remove_xfer(struct at_xdmac_chan *atchan,
1280 struct at_xdmac_desc *desc)
1282 dev_dbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
1285 * Remove the transfer from the transfer list then move the transfer
1286 * descriptors into the free descriptors list.
1288 list_del(&desc->xfer_node);
1289 list_splice_init(&desc->descs_list, &atchan->free_descs_list);
1292 static void at_xdmac_advance_work(struct at_xdmac_chan *atchan)
1294 struct at_xdmac_desc *desc;
1295 unsigned long flags;
1297 spin_lock_irqsave(&atchan->lock, flags);
1300 * If channel is enabled, do nothing, advance_work will be triggered
1301 * after the interruption.
1303 if (!at_xdmac_chan_is_enabled(atchan) && !list_empty(&atchan->xfers_list)) {
1304 desc = list_first_entry(&atchan->xfers_list,
1305 struct at_xdmac_desc,
1307 dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
1308 if (!desc->active_xfer)
1309 at_xdmac_start_xfer(atchan, desc);
1312 spin_unlock_irqrestore(&atchan->lock, flags);
1315 static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan)
1317 struct at_xdmac_desc *desc;
1318 struct dma_async_tx_descriptor *txd;
1320 desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node);
1321 txd = &desc->tx_dma_desc;
1323 if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT))
1324 txd->callback(txd->callback_param);
1327 static void at_xdmac_tasklet(unsigned long data)
1329 struct at_xdmac_chan *atchan = (struct at_xdmac_chan *)data;
1330 struct at_xdmac_desc *desc;
1333 dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08lx\n",
1334 __func__, atchan->status);
1336 error_mask = AT_XDMAC_CIS_RBEIS
1337 | AT_XDMAC_CIS_WBEIS
1338 | AT_XDMAC_CIS_ROIS;
1340 if (at_xdmac_chan_is_cyclic(atchan)) {
1341 at_xdmac_handle_cyclic(atchan);
1342 } else if ((atchan->status & AT_XDMAC_CIS_LIS)
1343 || (atchan->status & error_mask)) {
1344 struct dma_async_tx_descriptor *txd;
1346 if (atchan->status & AT_XDMAC_CIS_RBEIS)
1347 dev_err(chan2dev(&atchan->chan), "read bus error!!!");
1348 if (atchan->status & AT_XDMAC_CIS_WBEIS)
1349 dev_err(chan2dev(&atchan->chan), "write bus error!!!");
1350 if (atchan->status & AT_XDMAC_CIS_ROIS)
1351 dev_err(chan2dev(&atchan->chan), "request overflow error!!!");
1353 spin_lock_bh(&atchan->lock);
1354 desc = list_first_entry(&atchan->xfers_list,
1355 struct at_xdmac_desc,
1357 dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
1358 BUG_ON(!desc->active_xfer);
1360 txd = &desc->tx_dma_desc;
1362 at_xdmac_remove_xfer(atchan, desc);
1363 spin_unlock_bh(&atchan->lock);
1365 if (!at_xdmac_chan_is_cyclic(atchan)) {
1366 dma_cookie_complete(txd);
1367 if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT))
1368 txd->callback(txd->callback_param);
1371 dma_run_dependencies(txd);
1373 at_xdmac_advance_work(atchan);
1377 static irqreturn_t at_xdmac_interrupt(int irq, void *dev_id)
1379 struct at_xdmac *atxdmac = (struct at_xdmac *)dev_id;
1380 struct at_xdmac_chan *atchan;
1381 u32 imr, status, pending;
1382 u32 chan_imr, chan_status;
1383 int i, ret = IRQ_NONE;
1386 imr = at_xdmac_read(atxdmac, AT_XDMAC_GIM);
1387 status = at_xdmac_read(atxdmac, AT_XDMAC_GIS);
1388 pending = status & imr;
1390 dev_vdbg(atxdmac->dma.dev,
1391 "%s: status=0x%08x, imr=0x%08x, pending=0x%08x\n",
1392 __func__, status, imr, pending);
1397 /* We have to find which channel has generated the interrupt. */
1398 for (i = 0; i < atxdmac->dma.chancnt; i++) {
1399 if (!((1 << i) & pending))
1402 atchan = &atxdmac->chan[i];
1403 chan_imr = at_xdmac_chan_read(atchan, AT_XDMAC_CIM);
1404 chan_status = at_xdmac_chan_read(atchan, AT_XDMAC_CIS);
1405 atchan->status = chan_status & chan_imr;
1406 dev_vdbg(atxdmac->dma.dev,
1407 "%s: chan%d: imr=0x%x, status=0x%x\n",
1408 __func__, i, chan_imr, chan_status);
1409 dev_vdbg(chan2dev(&atchan->chan),
1410 "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n",
1412 at_xdmac_chan_read(atchan, AT_XDMAC_CC),
1413 at_xdmac_chan_read(atchan, AT_XDMAC_CNDA),
1414 at_xdmac_chan_read(atchan, AT_XDMAC_CNDC),
1415 at_xdmac_chan_read(atchan, AT_XDMAC_CSA),
1416 at_xdmac_chan_read(atchan, AT_XDMAC_CDA),
1417 at_xdmac_chan_read(atchan, AT_XDMAC_CUBC));
1419 if (atchan->status & (AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS))
1420 at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask);
1422 tasklet_schedule(&atchan->tasklet);
1431 static void at_xdmac_issue_pending(struct dma_chan *chan)
1433 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1435 dev_dbg(chan2dev(&atchan->chan), "%s\n", __func__);
1437 if (!at_xdmac_chan_is_cyclic(atchan))
1438 at_xdmac_advance_work(atchan);
1443 static int at_xdmac_device_config(struct dma_chan *chan,
1444 struct dma_slave_config *config)
1446 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1448 unsigned long flags;
1450 dev_dbg(chan2dev(chan), "%s\n", __func__);
1452 spin_lock_irqsave(&atchan->lock, flags);
1453 ret = at_xdmac_set_slave_config(chan, config);
1454 spin_unlock_irqrestore(&atchan->lock, flags);
1459 static int at_xdmac_device_pause(struct dma_chan *chan)
1461 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1462 struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
1463 unsigned long flags;
1465 dev_dbg(chan2dev(chan), "%s\n", __func__);
1467 if (test_and_set_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status))
1470 spin_lock_irqsave(&atchan->lock, flags);
1471 at_xdmac_write(atxdmac, AT_XDMAC_GRWS, atchan->mask);
1472 while (at_xdmac_chan_read(atchan, AT_XDMAC_CC)
1473 & (AT_XDMAC_CC_WRIP | AT_XDMAC_CC_RDIP))
1475 spin_unlock_irqrestore(&atchan->lock, flags);
1480 static int at_xdmac_device_resume(struct dma_chan *chan)
1482 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1483 struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
1484 unsigned long flags;
1486 dev_dbg(chan2dev(chan), "%s\n", __func__);
1488 spin_lock_irqsave(&atchan->lock, flags);
1489 if (!at_xdmac_chan_is_paused(atchan)) {
1490 spin_unlock_irqrestore(&atchan->lock, flags);
1494 at_xdmac_write(atxdmac, AT_XDMAC_GRWR, atchan->mask);
1495 clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
1496 spin_unlock_irqrestore(&atchan->lock, flags);
1501 static int at_xdmac_device_terminate_all(struct dma_chan *chan)
1503 struct at_xdmac_desc *desc, *_desc;
1504 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1505 struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
1506 unsigned long flags;
1508 dev_dbg(chan2dev(chan), "%s\n", __func__);
1510 spin_lock_irqsave(&atchan->lock, flags);
1511 at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask);
1512 while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask)
1515 /* Cancel all pending transfers. */
1516 list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node)
1517 at_xdmac_remove_xfer(atchan, desc);
1519 clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status);
1520 spin_unlock_irqrestore(&atchan->lock, flags);
1525 static int at_xdmac_alloc_chan_resources(struct dma_chan *chan)
1527 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1528 struct at_xdmac_desc *desc;
1530 unsigned long flags;
1532 spin_lock_irqsave(&atchan->lock, flags);
1534 if (at_xdmac_chan_is_enabled(atchan)) {
1535 dev_err(chan2dev(chan),
1536 "can't allocate channel resources (channel enabled)\n");
1541 if (!list_empty(&atchan->free_descs_list)) {
1542 dev_err(chan2dev(chan),
1543 "can't allocate channel resources (channel not free from a previous use)\n");
1548 for (i = 0; i < init_nr_desc_per_channel; i++) {
1549 desc = at_xdmac_alloc_desc(chan, GFP_ATOMIC);
1551 dev_warn(chan2dev(chan),
1552 "only %d descriptors have been allocated\n", i);
1555 list_add_tail(&desc->desc_node, &atchan->free_descs_list);
1558 dma_cookie_init(chan);
1560 dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i);
1563 spin_unlock_irqrestore(&atchan->lock, flags);
1567 static void at_xdmac_free_chan_resources(struct dma_chan *chan)
1569 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1570 struct at_xdmac *atxdmac = to_at_xdmac(chan->device);
1571 struct at_xdmac_desc *desc, *_desc;
1573 list_for_each_entry_safe(desc, _desc, &atchan->free_descs_list, desc_node) {
1574 dev_dbg(chan2dev(chan), "%s: freeing descriptor %p\n", __func__, desc);
1575 list_del(&desc->desc_node);
1576 dma_pool_free(atxdmac->at_xdmac_desc_pool, desc, desc->tx_dma_desc.phys);
1583 static int atmel_xdmac_prepare(struct device *dev)
1585 struct platform_device *pdev = to_platform_device(dev);
1586 struct at_xdmac *atxdmac = platform_get_drvdata(pdev);
1587 struct dma_chan *chan, *_chan;
1589 list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) {
1590 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1592 /* Wait for transfer completion, except in cyclic case. */
1593 if (at_xdmac_chan_is_enabled(atchan) && !at_xdmac_chan_is_cyclic(atchan))
1599 # define atmel_xdmac_prepare NULL
1602 #ifdef CONFIG_PM_SLEEP
1603 static int atmel_xdmac_suspend(struct device *dev)
1605 struct platform_device *pdev = to_platform_device(dev);
1606 struct at_xdmac *atxdmac = platform_get_drvdata(pdev);
1607 struct dma_chan *chan, *_chan;
1609 list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) {
1610 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1612 atchan->save_cc = at_xdmac_chan_read(atchan, AT_XDMAC_CC);
1613 if (at_xdmac_chan_is_cyclic(atchan)) {
1614 if (!at_xdmac_chan_is_paused(atchan))
1615 at_xdmac_device_pause(chan);
1616 atchan->save_cim = at_xdmac_chan_read(atchan, AT_XDMAC_CIM);
1617 atchan->save_cnda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA);
1618 atchan->save_cndc = at_xdmac_chan_read(atchan, AT_XDMAC_CNDC);
1621 atxdmac->save_gim = at_xdmac_read(atxdmac, AT_XDMAC_GIM);
1623 at_xdmac_off(atxdmac);
1624 clk_disable_unprepare(atxdmac->clk);
1628 static int atmel_xdmac_resume(struct device *dev)
1630 struct platform_device *pdev = to_platform_device(dev);
1631 struct at_xdmac *atxdmac = platform_get_drvdata(pdev);
1632 struct at_xdmac_chan *atchan;
1633 struct dma_chan *chan, *_chan;
1636 clk_prepare_enable(atxdmac->clk);
1638 /* Clear pending interrupts. */
1639 for (i = 0; i < atxdmac->dma.chancnt; i++) {
1640 atchan = &atxdmac->chan[i];
1641 while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS))
1645 at_xdmac_write(atxdmac, AT_XDMAC_GIE, atxdmac->save_gim);
1646 at_xdmac_write(atxdmac, AT_XDMAC_GE, atxdmac->save_gs);
1647 list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) {
1648 atchan = to_at_xdmac_chan(chan);
1649 at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->save_cc);
1650 if (at_xdmac_chan_is_cyclic(atchan)) {
1651 at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda);
1652 at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc);
1653 at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim);
1655 at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask);
1660 #endif /* CONFIG_PM_SLEEP */
1662 static int at_xdmac_probe(struct platform_device *pdev)
1664 struct resource *res;
1665 struct at_xdmac *atxdmac;
1666 int irq, size, nr_channels, i, ret;
1670 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1674 irq = platform_get_irq(pdev, 0);
1678 base = devm_ioremap_resource(&pdev->dev, res);
1680 return PTR_ERR(base);
1683 * Read number of xdmac channels, read helper function can't be used
1684 * since atxdmac is not yet allocated and we need to know the number
1685 * of channels to do the allocation.
1687 reg = readl_relaxed(base + AT_XDMAC_GTYPE);
1688 nr_channels = AT_XDMAC_NB_CH(reg);
1689 if (nr_channels > AT_XDMAC_MAX_CHAN) {
1690 dev_err(&pdev->dev, "invalid number of channels (%u)\n",
1695 size = sizeof(*atxdmac);
1696 size += nr_channels * sizeof(struct at_xdmac_chan);
1697 atxdmac = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
1699 dev_err(&pdev->dev, "can't allocate at_xdmac structure\n");
1703 atxdmac->regs = base;
1706 atxdmac->clk = devm_clk_get(&pdev->dev, "dma_clk");
1707 if (IS_ERR(atxdmac->clk)) {
1708 dev_err(&pdev->dev, "can't get dma_clk\n");
1709 return PTR_ERR(atxdmac->clk);
1712 /* Do not use dev res to prevent races with tasklet */
1713 ret = request_irq(atxdmac->irq, at_xdmac_interrupt, 0, "at_xdmac", atxdmac);
1715 dev_err(&pdev->dev, "can't request irq\n");
1719 ret = clk_prepare_enable(atxdmac->clk);
1721 dev_err(&pdev->dev, "can't prepare or enable clock\n");
1725 atxdmac->at_xdmac_desc_pool =
1726 dmam_pool_create(dev_name(&pdev->dev), &pdev->dev,
1727 sizeof(struct at_xdmac_desc), 4, 0);
1728 if (!atxdmac->at_xdmac_desc_pool) {
1729 dev_err(&pdev->dev, "no memory for descriptors dma pool\n");
1731 goto err_clk_disable;
1734 dma_cap_set(DMA_CYCLIC, atxdmac->dma.cap_mask);
1735 dma_cap_set(DMA_INTERLEAVE, atxdmac->dma.cap_mask);
1736 dma_cap_set(DMA_MEMCPY, atxdmac->dma.cap_mask);
1737 dma_cap_set(DMA_MEMSET, atxdmac->dma.cap_mask);
1738 dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask);
1740 * Without DMA_PRIVATE the driver is not able to allocate more than
1741 * one channel, second allocation fails in private_candidate.
1743 dma_cap_set(DMA_PRIVATE, atxdmac->dma.cap_mask);
1744 atxdmac->dma.dev = &pdev->dev;
1745 atxdmac->dma.device_alloc_chan_resources = at_xdmac_alloc_chan_resources;
1746 atxdmac->dma.device_free_chan_resources = at_xdmac_free_chan_resources;
1747 atxdmac->dma.device_tx_status = at_xdmac_tx_status;
1748 atxdmac->dma.device_issue_pending = at_xdmac_issue_pending;
1749 atxdmac->dma.device_prep_dma_cyclic = at_xdmac_prep_dma_cyclic;
1750 atxdmac->dma.device_prep_interleaved_dma = at_xdmac_prep_interleaved;
1751 atxdmac->dma.device_prep_dma_memcpy = at_xdmac_prep_dma_memcpy;
1752 atxdmac->dma.device_prep_dma_memset = at_xdmac_prep_dma_memset;
1753 atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg;
1754 atxdmac->dma.device_config = at_xdmac_device_config;
1755 atxdmac->dma.device_pause = at_xdmac_device_pause;
1756 atxdmac->dma.device_resume = at_xdmac_device_resume;
1757 atxdmac->dma.device_terminate_all = at_xdmac_device_terminate_all;
1758 atxdmac->dma.src_addr_widths = AT_XDMAC_DMA_BUSWIDTHS;
1759 atxdmac->dma.dst_addr_widths = AT_XDMAC_DMA_BUSWIDTHS;
1760 atxdmac->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
1761 atxdmac->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1763 /* Disable all chans and interrupts. */
1764 at_xdmac_off(atxdmac);
1766 /* Init channels. */
1767 INIT_LIST_HEAD(&atxdmac->dma.channels);
1768 for (i = 0; i < nr_channels; i++) {
1769 struct at_xdmac_chan *atchan = &atxdmac->chan[i];
1771 atchan->chan.device = &atxdmac->dma;
1772 list_add_tail(&atchan->chan.device_node,
1773 &atxdmac->dma.channels);
1775 atchan->ch_regs = at_xdmac_chan_reg_base(atxdmac, i);
1776 atchan->mask = 1 << i;
1778 spin_lock_init(&atchan->lock);
1779 INIT_LIST_HEAD(&atchan->xfers_list);
1780 INIT_LIST_HEAD(&atchan->free_descs_list);
1781 tasklet_init(&atchan->tasklet, at_xdmac_tasklet,
1782 (unsigned long)atchan);
1784 /* Clear pending interrupts. */
1785 while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS))
1788 platform_set_drvdata(pdev, atxdmac);
1790 ret = dma_async_device_register(&atxdmac->dma);
1792 dev_err(&pdev->dev, "fail to register DMA engine device\n");
1793 goto err_clk_disable;
1796 ret = of_dma_controller_register(pdev->dev.of_node,
1797 at_xdmac_xlate, atxdmac);
1799 dev_err(&pdev->dev, "could not register of dma controller\n");
1800 goto err_dma_unregister;
1803 dev_info(&pdev->dev, "%d channels, mapped at 0x%p\n",
1804 nr_channels, atxdmac->regs);
1809 dma_async_device_unregister(&atxdmac->dma);
1811 clk_disable_unprepare(atxdmac->clk);
1813 free_irq(atxdmac->irq, atxdmac->dma.dev);
1817 static int at_xdmac_remove(struct platform_device *pdev)
1819 struct at_xdmac *atxdmac = (struct at_xdmac *)platform_get_drvdata(pdev);
1822 at_xdmac_off(atxdmac);
1823 of_dma_controller_free(pdev->dev.of_node);
1824 dma_async_device_unregister(&atxdmac->dma);
1825 clk_disable_unprepare(atxdmac->clk);
1827 synchronize_irq(atxdmac->irq);
1829 free_irq(atxdmac->irq, atxdmac->dma.dev);
1831 for (i = 0; i < atxdmac->dma.chancnt; i++) {
1832 struct at_xdmac_chan *atchan = &atxdmac->chan[i];
1834 tasklet_kill(&atchan->tasklet);
1835 at_xdmac_free_chan_resources(&atchan->chan);
1841 static const struct dev_pm_ops atmel_xdmac_dev_pm_ops = {
1842 .prepare = atmel_xdmac_prepare,
1843 SET_LATE_SYSTEM_SLEEP_PM_OPS(atmel_xdmac_suspend, atmel_xdmac_resume)
1846 static const struct of_device_id atmel_xdmac_dt_ids[] = {
1848 .compatible = "atmel,sama5d4-dma",
1853 MODULE_DEVICE_TABLE(of, atmel_xdmac_dt_ids);
1855 static struct platform_driver at_xdmac_driver = {
1856 .probe = at_xdmac_probe,
1857 .remove = at_xdmac_remove,
1860 .of_match_table = of_match_ptr(atmel_xdmac_dt_ids),
1861 .pm = &atmel_xdmac_dev_pm_ops,
1865 static int __init at_xdmac_init(void)
1867 return platform_driver_probe(&at_xdmac_driver, at_xdmac_probe);
1869 subsys_initcall(at_xdmac_init);
1871 MODULE_DESCRIPTION("Atmel Extended DMA Controller driver");
1872 MODULE_AUTHOR("Ludovic Desroches <ludovic.desroches@atmel.com>");
1873 MODULE_LICENSE("GPL");