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/list.h>
29 #include <linux/module.h>
30 #include <linux/of_dma.h>
31 #include <linux/of_platform.h>
32 #include <linux/platform_device.h>
35 #include "dmaengine.h"
37 /* Global registers */
38 #define AT_XDMAC_GTYPE 0x00 /* Global Type Register */
39 #define AT_XDMAC_NB_CH(i) (((i) & 0x1F) + 1) /* Number of Channels Minus One */
40 #define AT_XDMAC_FIFO_SZ(i) (((i) >> 5) & 0x7FF) /* Number of Bytes */
41 #define AT_XDMAC_NB_REQ(i) ((((i) >> 16) & 0x3F) + 1) /* Number of Peripheral Requests Minus One */
42 #define AT_XDMAC_GCFG 0x04 /* Global Configuration Register */
43 #define AT_XDMAC_GWAC 0x08 /* Global Weighted Arbiter Configuration Register */
44 #define AT_XDMAC_GIE 0x0C /* Global Interrupt Enable Register */
45 #define AT_XDMAC_GID 0x10 /* Global Interrupt Disable Register */
46 #define AT_XDMAC_GIM 0x14 /* Global Interrupt Mask Register */
47 #define AT_XDMAC_GIS 0x18 /* Global Interrupt Status Register */
48 #define AT_XDMAC_GE 0x1C /* Global Channel Enable Register */
49 #define AT_XDMAC_GD 0x20 /* Global Channel Disable Register */
50 #define AT_XDMAC_GS 0x24 /* Global Channel Status Register */
51 #define AT_XDMAC_GRS 0x28 /* Global Channel Read Suspend Register */
52 #define AT_XDMAC_GWS 0x2C /* Global Write Suspend Register */
53 #define AT_XDMAC_GRWS 0x30 /* Global Channel Read Write Suspend Register */
54 #define AT_XDMAC_GRWR 0x34 /* Global Channel Read Write Resume Register */
55 #define AT_XDMAC_GSWR 0x38 /* Global Channel Software Request Register */
56 #define AT_XDMAC_GSWS 0x3C /* Global channel Software Request Status Register */
57 #define AT_XDMAC_GSWF 0x40 /* Global Channel Software Flush Request Register */
58 #define AT_XDMAC_VERSION 0xFFC /* XDMAC Version Register */
60 /* Channel relative registers offsets */
61 #define AT_XDMAC_CIE 0x00 /* Channel Interrupt Enable Register */
62 #define AT_XDMAC_CIE_BIE BIT(0) /* End of Block Interrupt Enable Bit */
63 #define AT_XDMAC_CIE_LIE BIT(1) /* End of Linked List Interrupt Enable Bit */
64 #define AT_XDMAC_CIE_DIE BIT(2) /* End of Disable Interrupt Enable Bit */
65 #define AT_XDMAC_CIE_FIE BIT(3) /* End of Flush Interrupt Enable Bit */
66 #define AT_XDMAC_CIE_RBEIE BIT(4) /* Read Bus Error Interrupt Enable Bit */
67 #define AT_XDMAC_CIE_WBEIE BIT(5) /* Write Bus Error Interrupt Enable Bit */
68 #define AT_XDMAC_CIE_ROIE BIT(6) /* Request Overflow Interrupt Enable Bit */
69 #define AT_XDMAC_CID 0x04 /* Channel Interrupt Disable Register */
70 #define AT_XDMAC_CID_BID BIT(0) /* End of Block Interrupt Disable Bit */
71 #define AT_XDMAC_CID_LID BIT(1) /* End of Linked List Interrupt Disable Bit */
72 #define AT_XDMAC_CID_DID BIT(2) /* End of Disable Interrupt Disable Bit */
73 #define AT_XDMAC_CID_FID BIT(3) /* End of Flush Interrupt Disable Bit */
74 #define AT_XDMAC_CID_RBEID BIT(4) /* Read Bus Error Interrupt Disable Bit */
75 #define AT_XDMAC_CID_WBEID BIT(5) /* Write Bus Error Interrupt Disable Bit */
76 #define AT_XDMAC_CID_ROID BIT(6) /* Request Overflow Interrupt Disable Bit */
77 #define AT_XDMAC_CIM 0x08 /* Channel Interrupt Mask Register */
78 #define AT_XDMAC_CIM_BIM BIT(0) /* End of Block Interrupt Mask Bit */
79 #define AT_XDMAC_CIM_LIM BIT(1) /* End of Linked List Interrupt Mask Bit */
80 #define AT_XDMAC_CIM_DIM BIT(2) /* End of Disable Interrupt Mask Bit */
81 #define AT_XDMAC_CIM_FIM BIT(3) /* End of Flush Interrupt Mask Bit */
82 #define AT_XDMAC_CIM_RBEIM BIT(4) /* Read Bus Error Interrupt Mask Bit */
83 #define AT_XDMAC_CIM_WBEIM BIT(5) /* Write Bus Error Interrupt Mask Bit */
84 #define AT_XDMAC_CIM_ROIM BIT(6) /* Request Overflow Interrupt Mask Bit */
85 #define AT_XDMAC_CIS 0x0C /* Channel Interrupt Status Register */
86 #define AT_XDMAC_CIS_BIS BIT(0) /* End of Block Interrupt Status Bit */
87 #define AT_XDMAC_CIS_LIS BIT(1) /* End of Linked List Interrupt Status Bit */
88 #define AT_XDMAC_CIS_DIS BIT(2) /* End of Disable Interrupt Status Bit */
89 #define AT_XDMAC_CIS_FIS BIT(3) /* End of Flush Interrupt Status Bit */
90 #define AT_XDMAC_CIS_RBEIS BIT(4) /* Read Bus Error Interrupt Status Bit */
91 #define AT_XDMAC_CIS_WBEIS BIT(5) /* Write Bus Error Interrupt Status Bit */
92 #define AT_XDMAC_CIS_ROIS BIT(6) /* Request Overflow Interrupt Status Bit */
93 #define AT_XDMAC_CSA 0x10 /* Channel Source Address Register */
94 #define AT_XDMAC_CDA 0x14 /* Channel Destination Address Register */
95 #define AT_XDMAC_CNDA 0x18 /* Channel Next Descriptor Address Register */
96 #define AT_XDMAC_CNDA_NDAIF(i) ((i) & 0x1) /* Channel x Next Descriptor Interface */
97 #define AT_XDMAC_CNDA_NDA(i) ((i) & 0xfffffffc) /* Channel x Next Descriptor Address */
98 #define AT_XDMAC_CNDC 0x1C /* Channel Next Descriptor Control Register */
99 #define AT_XDMAC_CNDC_NDE (0x1 << 0) /* Channel x Next Descriptor Enable */
100 #define AT_XDMAC_CNDC_NDSUP (0x1 << 1) /* Channel x Next Descriptor Source Update */
101 #define AT_XDMAC_CNDC_NDDUP (0x1 << 2) /* Channel x Next Descriptor Destination Update */
102 #define AT_XDMAC_CNDC_NDVIEW_NDV0 (0x0 << 3) /* Channel x Next Descriptor View 0 */
103 #define AT_XDMAC_CNDC_NDVIEW_NDV1 (0x1 << 3) /* Channel x Next Descriptor View 1 */
104 #define AT_XDMAC_CNDC_NDVIEW_NDV2 (0x2 << 3) /* Channel x Next Descriptor View 2 */
105 #define AT_XDMAC_CNDC_NDVIEW_NDV3 (0x3 << 3) /* Channel x Next Descriptor View 3 */
106 #define AT_XDMAC_CUBC 0x20 /* Channel Microblock Control Register */
107 #define AT_XDMAC_CBC 0x24 /* Channel Block Control Register */
108 #define AT_XDMAC_CC 0x28 /* Channel Configuration Register */
109 #define AT_XDMAC_CC_TYPE (0x1 << 0) /* Channel Transfer Type */
110 #define AT_XDMAC_CC_TYPE_MEM_TRAN (0x0 << 0) /* Memory to Memory Transfer */
111 #define AT_XDMAC_CC_TYPE_PER_TRAN (0x1 << 0) /* Peripheral to Memory or Memory to Peripheral Transfer */
112 #define AT_XDMAC_CC_MBSIZE_MASK (0x3 << 1)
113 #define AT_XDMAC_CC_MBSIZE_SINGLE (0x0 << 1)
114 #define AT_XDMAC_CC_MBSIZE_FOUR (0x1 << 1)
115 #define AT_XDMAC_CC_MBSIZE_EIGHT (0x2 << 1)
116 #define AT_XDMAC_CC_MBSIZE_SIXTEEN (0x3 << 1)
117 #define AT_XDMAC_CC_DSYNC (0x1 << 4) /* Channel Synchronization */
118 #define AT_XDMAC_CC_DSYNC_PER2MEM (0x0 << 4)
119 #define AT_XDMAC_CC_DSYNC_MEM2PER (0x1 << 4)
120 #define AT_XDMAC_CC_PROT (0x1 << 5) /* Channel Protection */
121 #define AT_XDMAC_CC_PROT_SEC (0x0 << 5)
122 #define AT_XDMAC_CC_PROT_UNSEC (0x1 << 5)
123 #define AT_XDMAC_CC_SWREQ (0x1 << 6) /* Channel Software Request Trigger */
124 #define AT_XDMAC_CC_SWREQ_HWR_CONNECTED (0x0 << 6)
125 #define AT_XDMAC_CC_SWREQ_SWR_CONNECTED (0x1 << 6)
126 #define AT_XDMAC_CC_MEMSET (0x1 << 7) /* Channel Fill Block of memory */
127 #define AT_XDMAC_CC_MEMSET_NORMAL_MODE (0x0 << 7)
128 #define AT_XDMAC_CC_MEMSET_HW_MODE (0x1 << 7)
129 #define AT_XDMAC_CC_CSIZE(i) ((0x7 & (i)) << 8) /* Channel Chunk Size */
130 #define AT_XDMAC_CC_DWIDTH_OFFSET 11
131 #define AT_XDMAC_CC_DWIDTH_MASK (0x3 << AT_XDMAC_CC_DWIDTH_OFFSET)
132 #define AT_XDMAC_CC_DWIDTH(i) ((0x3 & (i)) << AT_XDMAC_CC_DWIDTH_OFFSET) /* Channel Data Width */
133 #define AT_XDMAC_CC_DWIDTH_BYTE 0x0
134 #define AT_XDMAC_CC_DWIDTH_HALFWORD 0x1
135 #define AT_XDMAC_CC_DWIDTH_WORD 0x2
136 #define AT_XDMAC_CC_DWIDTH_DWORD 0x3
137 #define AT_XDMAC_CC_SIF(i) ((0x1 & (i)) << 13) /* Channel Source Interface Identifier */
138 #define AT_XDMAC_CC_DIF(i) ((0x1 & (i)) << 14) /* Channel Destination Interface Identifier */
139 #define AT_XDMAC_CC_SAM_MASK (0x3 << 16) /* Channel Source Addressing Mode */
140 #define AT_XDMAC_CC_SAM_FIXED_AM (0x0 << 16)
141 #define AT_XDMAC_CC_SAM_INCREMENTED_AM (0x1 << 16)
142 #define AT_XDMAC_CC_SAM_UBS_AM (0x2 << 16)
143 #define AT_XDMAC_CC_SAM_UBS_DS_AM (0x3 << 16)
144 #define AT_XDMAC_CC_DAM_MASK (0x3 << 18) /* Channel Source Addressing Mode */
145 #define AT_XDMAC_CC_DAM_FIXED_AM (0x0 << 18)
146 #define AT_XDMAC_CC_DAM_INCREMENTED_AM (0x1 << 18)
147 #define AT_XDMAC_CC_DAM_UBS_AM (0x2 << 18)
148 #define AT_XDMAC_CC_DAM_UBS_DS_AM (0x3 << 18)
149 #define AT_XDMAC_CC_INITD (0x1 << 21) /* Channel Initialization Terminated (read only) */
150 #define AT_XDMAC_CC_INITD_TERMINATED (0x0 << 21)
151 #define AT_XDMAC_CC_INITD_IN_PROGRESS (0x1 << 21)
152 #define AT_XDMAC_CC_RDIP (0x1 << 22) /* Read in Progress (read only) */
153 #define AT_XDMAC_CC_RDIP_DONE (0x0 << 22)
154 #define AT_XDMAC_CC_RDIP_IN_PROGRESS (0x1 << 22)
155 #define AT_XDMAC_CC_WRIP (0x1 << 23) /* Write in Progress (read only) */
156 #define AT_XDMAC_CC_WRIP_DONE (0x0 << 23)
157 #define AT_XDMAC_CC_WRIP_IN_PROGRESS (0x1 << 23)
158 #define AT_XDMAC_CC_PERID(i) (0x7f & (h) << 24) /* Channel Peripheral Identifier */
159 #define AT_XDMAC_CDS_MSP 0x2C /* Channel Data Stride Memory Set Pattern */
160 #define AT_XDMAC_CSUS 0x30 /* Channel Source Microblock Stride */
161 #define AT_XDMAC_CDUS 0x34 /* Channel Destination Microblock Stride */
163 #define AT_XDMAC_CHAN_REG_BASE 0x50 /* Channel registers base address */
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 */
175 #define AT_XDMAC_MAX_CHAN 0x20
177 #define AT_XDMAC_DMA_BUSWIDTHS\
178 (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) |\
179 BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |\
180 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |\
181 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |\
182 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
185 AT_XDMAC_CHAN_IS_CYCLIC = 0,
186 AT_XDMAC_CHAN_IS_PAUSED,
189 /* ----- Channels ----- */
190 struct at_xdmac_chan {
191 struct dma_chan chan;
192 void __iomem *ch_regs;
193 u32 mask; /* Channel Mask */
194 u32 cfg[3]; /* Channel Configuration Register */
195 #define AT_XDMAC_CUR_CFG 0 /* Current channel conf */
196 #define AT_XDMAC_DEV_TO_MEM_CFG 1 /* Predifined dev to mem channel conf */
197 #define AT_XDMAC_MEM_TO_DEV_CFG 2 /* Predifined mem to dev channel conf */
198 u8 perid; /* Peripheral ID */
199 u8 perif; /* Peripheral Interface */
200 u8 memif; /* Memory Interface */
206 unsigned long status;
207 struct tasklet_struct tasklet;
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 */
241 struct at_xdmac_desc {
242 struct at_xdmac_lld lld;
243 enum dma_transfer_direction direction;
244 struct dma_async_tx_descriptor tx_dma_desc;
245 struct list_head desc_node;
246 /* Following members are only used by the first descriptor */
248 unsigned int xfer_size;
249 struct list_head descs_list;
250 struct list_head xfer_node;
253 static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb)
255 return atxdmac->regs + (AT_XDMAC_CHAN_REG_BASE + chan_nb * 0x40);
258 #define at_xdmac_read(atxdmac, reg) readl_relaxed((atxdmac)->regs + (reg))
259 #define at_xdmac_write(atxdmac, reg, value) \
260 writel_relaxed((value), (atxdmac)->regs + (reg))
262 #define at_xdmac_chan_read(atchan, reg) readl_relaxed((atchan)->ch_regs + (reg))
263 #define at_xdmac_chan_write(atchan, reg, value) writel_relaxed((value), (atchan)->ch_regs + (reg))
265 static inline struct at_xdmac_chan *to_at_xdmac_chan(struct dma_chan *dchan)
267 return container_of(dchan, struct at_xdmac_chan, chan);
270 static struct device *chan2dev(struct dma_chan *chan)
272 return &chan->dev->device;
275 static inline struct at_xdmac *to_at_xdmac(struct dma_device *ddev)
277 return container_of(ddev, struct at_xdmac, dma);
280 static inline struct at_xdmac_desc *txd_to_at_desc(struct dma_async_tx_descriptor *txd)
282 return container_of(txd, struct at_xdmac_desc, tx_dma_desc);
285 static inline int at_xdmac_chan_is_cyclic(struct at_xdmac_chan *atchan)
287 return test_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status);
290 static inline int at_xdmac_chan_is_paused(struct at_xdmac_chan *atchan)
292 return test_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
295 static inline int at_xdmac_csize(u32 maxburst)
299 csize = ffs(maxburst) - 1;
306 static inline u8 at_xdmac_get_dwidth(u32 cfg)
308 return (cfg & AT_XDMAC_CC_DWIDTH_MASK) >> AT_XDMAC_CC_DWIDTH_OFFSET;
311 static unsigned int init_nr_desc_per_channel = 64;
312 module_param(init_nr_desc_per_channel, uint, 0644);
313 MODULE_PARM_DESC(init_nr_desc_per_channel,
314 "initial descriptors per channel (default: 64)");
317 static bool at_xdmac_chan_is_enabled(struct at_xdmac_chan *atchan)
319 return at_xdmac_chan_read(atchan, AT_XDMAC_GS) & atchan->mask;
322 static void at_xdmac_off(struct at_xdmac *atxdmac)
324 at_xdmac_write(atxdmac, AT_XDMAC_GD, -1L);
326 /* Wait that all chans are disabled. */
327 while (at_xdmac_read(atxdmac, AT_XDMAC_GS))
330 at_xdmac_write(atxdmac, AT_XDMAC_GID, -1L);
333 /* Call with lock hold. */
334 static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan,
335 struct at_xdmac_desc *first)
337 struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
340 dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, first);
342 if (at_xdmac_chan_is_enabled(atchan))
345 /* Set transfer as active to not try to start it again. */
346 first->active_xfer = true;
348 /* Tell xdmac where to get the first descriptor. */
349 reg = AT_XDMAC_CNDA_NDA(first->tx_dma_desc.phys)
350 | AT_XDMAC_CNDA_NDAIF(atchan->memif);
351 at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, reg);
354 * When doing memory to memory transfer we need to use the next
355 * descriptor view 2 since some fields of the configuration register
356 * depend on transfer size and src/dest addresses.
358 if (is_slave_direction(first->direction)) {
359 reg = AT_XDMAC_CNDC_NDVIEW_NDV1;
360 if (first->direction == DMA_MEM_TO_DEV)
361 atchan->cfg[AT_XDMAC_CUR_CFG] =
362 atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG];
364 atchan->cfg[AT_XDMAC_CUR_CFG] =
365 atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG];
366 at_xdmac_chan_write(atchan, AT_XDMAC_CC,
367 atchan->cfg[AT_XDMAC_CUR_CFG]);
370 * No need to write AT_XDMAC_CC reg, it will be done when the
371 * descriptor is fecthed.
373 reg = AT_XDMAC_CNDC_NDVIEW_NDV2;
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);
425 spin_lock_bh(&atchan->lock);
426 cookie = dma_cookie_assign(tx);
428 dev_vdbg(chan2dev(tx->chan), "%s: atchan 0x%p, add desc 0x%p to xfers_list\n",
429 __func__, atchan, desc);
430 list_add_tail(&desc->xfer_node, &atchan->xfers_list);
431 if (list_is_singular(&atchan->xfers_list))
432 at_xdmac_start_xfer(atchan, desc);
434 spin_unlock_bh(&atchan->lock);
438 static struct at_xdmac_desc *at_xdmac_alloc_desc(struct dma_chan *chan,
441 struct at_xdmac_desc *desc;
442 struct at_xdmac *atxdmac = to_at_xdmac(chan->device);
445 desc = dma_pool_alloc(atxdmac->at_xdmac_desc_pool, gfp_flags, &phys);
447 memset(desc, 0, sizeof(*desc));
448 INIT_LIST_HEAD(&desc->descs_list);
449 dma_async_tx_descriptor_init(&desc->tx_dma_desc, chan);
450 desc->tx_dma_desc.tx_submit = at_xdmac_tx_submit;
451 desc->tx_dma_desc.phys = phys;
457 /* Call must be protected by lock. */
458 static struct at_xdmac_desc *at_xdmac_get_desc(struct at_xdmac_chan *atchan)
460 struct at_xdmac_desc *desc;
462 if (list_empty(&atchan->free_descs_list)) {
463 desc = at_xdmac_alloc_desc(&atchan->chan, GFP_NOWAIT);
465 desc = list_first_entry(&atchan->free_descs_list,
466 struct at_xdmac_desc, desc_node);
467 list_del(&desc->desc_node);
468 desc->active_xfer = false;
474 static struct dma_chan *at_xdmac_xlate(struct of_phandle_args *dma_spec,
475 struct of_dma *of_dma)
477 struct at_xdmac *atxdmac = of_dma->of_dma_data;
478 struct at_xdmac_chan *atchan;
479 struct dma_chan *chan;
480 struct device *dev = atxdmac->dma.dev;
482 if (dma_spec->args_count != 1) {
483 dev_err(dev, "dma phandler args: bad number of args\n");
487 chan = dma_get_any_slave_channel(&atxdmac->dma);
489 dev_err(dev, "can't get a dma channel\n");
493 atchan = to_at_xdmac_chan(chan);
494 atchan->memif = AT91_XDMAC_DT_GET_MEM_IF(dma_spec->args[0]);
495 atchan->perif = AT91_XDMAC_DT_GET_PER_IF(dma_spec->args[0]);
496 atchan->perid = AT91_XDMAC_DT_GET_PERID(dma_spec->args[0]);
497 dev_dbg(dev, "chan dt cfg: memif=%u perif=%u perid=%u\n",
498 atchan->memif, atchan->perif, atchan->perid);
503 static int at_xdmac_set_slave_config(struct dma_chan *chan,
504 struct dma_slave_config *sconfig)
506 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
510 atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG] =
511 AT91_XDMAC_DT_PERID(atchan->perid)
512 | AT_XDMAC_CC_DAM_INCREMENTED_AM
513 | AT_XDMAC_CC_SAM_FIXED_AM
514 | AT_XDMAC_CC_DIF(atchan->memif)
515 | AT_XDMAC_CC_SIF(atchan->perif)
516 | AT_XDMAC_CC_SWREQ_HWR_CONNECTED
517 | AT_XDMAC_CC_DSYNC_PER2MEM
518 | AT_XDMAC_CC_MBSIZE_SIXTEEN
519 | AT_XDMAC_CC_TYPE_PER_TRAN;
520 csize = at_xdmac_csize(sconfig->src_maxburst);
522 dev_err(chan2dev(chan), "invalid src maxburst value\n");
525 atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG] |= AT_XDMAC_CC_CSIZE(csize);
526 dwidth = ffs(sconfig->src_addr_width) - 1;
527 atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG] |= AT_XDMAC_CC_DWIDTH(dwidth);
530 atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG] =
531 AT91_XDMAC_DT_PERID(atchan->perid)
532 | AT_XDMAC_CC_DAM_FIXED_AM
533 | AT_XDMAC_CC_SAM_INCREMENTED_AM
534 | AT_XDMAC_CC_DIF(atchan->perif)
535 | AT_XDMAC_CC_SIF(atchan->memif)
536 | AT_XDMAC_CC_SWREQ_HWR_CONNECTED
537 | AT_XDMAC_CC_DSYNC_MEM2PER
538 | AT_XDMAC_CC_MBSIZE_SIXTEEN
539 | AT_XDMAC_CC_TYPE_PER_TRAN;
540 csize = at_xdmac_csize(sconfig->dst_maxburst);
542 dev_err(chan2dev(chan), "invalid src maxburst value\n");
545 atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG] |= AT_XDMAC_CC_CSIZE(csize);
546 dwidth = ffs(sconfig->dst_addr_width) - 1;
547 atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG] |= AT_XDMAC_CC_DWIDTH(dwidth);
549 /* Src and dst addr are needed to configure the link list descriptor. */
550 atchan->per_src_addr = sconfig->src_addr;
551 atchan->per_dst_addr = sconfig->dst_addr;
553 dev_dbg(chan2dev(chan),
554 "%s: cfg[dev2mem]=0x%08x, cfg[mem2dev]=0x%08x, per_src_addr=0x%08x, per_dst_addr=0x%08x\n",
555 __func__, atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG],
556 atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG],
557 atchan->per_src_addr, atchan->per_dst_addr);
562 static struct dma_async_tx_descriptor *
563 at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
564 unsigned int sg_len, enum dma_transfer_direction direction,
565 unsigned long flags, void *context)
567 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
568 struct at_xdmac_desc *first = NULL, *prev = NULL;
569 struct scatterlist *sg;
572 unsigned int xfer_size = 0;
577 if (!is_slave_direction(direction)) {
578 dev_err(chan2dev(chan), "invalid DMA direction\n");
582 dev_dbg(chan2dev(chan), "%s: sg_len=%d, dir=%s, flags=0x%lx\n",
584 direction == DMA_MEM_TO_DEV ? "to device" : "from device",
587 /* Protect dma_sconfig field that can be modified by set_slave_conf. */
588 spin_lock_bh(&atchan->lock);
590 /* Prepare descriptors. */
591 for_each_sg(sgl, sg, sg_len, i) {
592 struct at_xdmac_desc *desc = NULL;
595 len = sg_dma_len(sg);
596 mem = sg_dma_address(sg);
597 if (unlikely(!len)) {
598 dev_err(chan2dev(chan), "sg data length is zero\n");
599 spin_unlock_bh(&atchan->lock);
602 dev_dbg(chan2dev(chan), "%s: * sg%d len=%u, mem=0x%08x\n",
603 __func__, i, len, mem);
605 desc = at_xdmac_get_desc(atchan);
607 dev_err(chan2dev(chan), "can't get descriptor\n");
609 list_splice_init(&first->descs_list, &atchan->free_descs_list);
610 spin_unlock_bh(&atchan->lock);
614 /* Linked list descriptor setup. */
615 if (direction == DMA_DEV_TO_MEM) {
616 desc->lld.mbr_sa = atchan->per_src_addr;
617 desc->lld.mbr_da = mem;
618 cfg = atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG];
620 desc->lld.mbr_sa = mem;
621 desc->lld.mbr_da = atchan->per_dst_addr;
622 cfg = atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG];
624 desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1 /* next descriptor view */
625 | AT_XDMAC_MBR_UBC_NDEN /* next descriptor dst parameter update */
626 | AT_XDMAC_MBR_UBC_NSEN /* next descriptor src parameter update */
627 | (i == sg_len - 1 ? 0 : AT_XDMAC_MBR_UBC_NDE) /* descriptor fetch */
628 | len / (1 << at_xdmac_get_dwidth(cfg)); /* microblock length */
629 dev_dbg(chan2dev(chan),
630 "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n",
631 __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc);
635 prev->lld.mbr_nda = desc->tx_dma_desc.phys;
636 dev_dbg(chan2dev(chan),
637 "%s: chain lld: prev=0x%p, mbr_nda=%pad\n",
638 __func__, prev, &prev->lld.mbr_nda);
645 dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
646 __func__, desc, first);
647 list_add_tail(&desc->desc_node, &first->descs_list);
651 spin_unlock_bh(&atchan->lock);
653 first->tx_dma_desc.flags = flags;
654 first->xfer_size = xfer_size;
655 first->direction = direction;
657 return &first->tx_dma_desc;
660 static struct dma_async_tx_descriptor *
661 at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,
662 size_t buf_len, size_t period_len,
663 enum dma_transfer_direction direction,
666 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
667 struct at_xdmac_desc *first = NULL, *prev = NULL;
668 unsigned int periods = buf_len / period_len;
672 dev_dbg(chan2dev(chan), "%s: buf_addr=%pad, buf_len=%zd, period_len=%zd, dir=%s, flags=0x%lx\n",
673 __func__, &buf_addr, buf_len, period_len,
674 direction == DMA_MEM_TO_DEV ? "mem2per" : "per2mem", flags);
676 if (!is_slave_direction(direction)) {
677 dev_err(chan2dev(chan), "invalid DMA direction\n");
681 if (test_and_set_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status)) {
682 dev_err(chan2dev(chan), "channel currently used\n");
686 for (i = 0; i < periods; i++) {
687 struct at_xdmac_desc *desc = NULL;
689 spin_lock_bh(&atchan->lock);
690 desc = at_xdmac_get_desc(atchan);
692 dev_err(chan2dev(chan), "can't get descriptor\n");
694 list_splice_init(&first->descs_list, &atchan->free_descs_list);
695 spin_unlock_bh(&atchan->lock);
698 spin_unlock_bh(&atchan->lock);
699 dev_dbg(chan2dev(chan),
700 "%s: desc=0x%p, tx_dma_desc.phys=%pad\n",
701 __func__, desc, &desc->tx_dma_desc.phys);
703 if (direction == DMA_DEV_TO_MEM) {
704 desc->lld.mbr_sa = atchan->per_src_addr;
705 desc->lld.mbr_da = buf_addr + i * period_len;
706 cfg = atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG];
708 desc->lld.mbr_sa = buf_addr + i * period_len;
709 desc->lld.mbr_da = atchan->per_dst_addr;
710 cfg = atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG];
712 desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1
713 | AT_XDMAC_MBR_UBC_NDEN
714 | AT_XDMAC_MBR_UBC_NSEN
715 | AT_XDMAC_MBR_UBC_NDE
716 | period_len >> at_xdmac_get_dwidth(cfg);
718 dev_dbg(chan2dev(chan),
719 "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n",
720 __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc);
724 prev->lld.mbr_nda = desc->tx_dma_desc.phys;
725 dev_dbg(chan2dev(chan),
726 "%s: chain lld: prev=0x%p, mbr_nda=%pad\n",
727 __func__, prev, &prev->lld.mbr_nda);
734 dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
735 __func__, desc, first);
736 list_add_tail(&desc->desc_node, &first->descs_list);
739 prev->lld.mbr_nda = first->tx_dma_desc.phys;
740 dev_dbg(chan2dev(chan),
741 "%s: chain lld: prev=0x%p, mbr_nda=%pad\n",
742 __func__, prev, &prev->lld.mbr_nda);
743 first->tx_dma_desc.flags = flags;
744 first->xfer_size = buf_len;
745 first->direction = direction;
747 return &first->tx_dma_desc;
750 static struct dma_async_tx_descriptor *
751 at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
752 size_t len, unsigned long flags)
754 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
755 struct at_xdmac_desc *first = NULL, *prev = NULL;
756 size_t remaining_size = len, xfer_size = 0, ublen;
757 dma_addr_t src_addr = src, dst_addr = dest;
760 * WARNING: We don't know the direction, it involves we can't
761 * dynamically set the source and dest interface so we have to use the
762 * same one. Only interface 0 allows EBI access. Hopefully we can
763 * access DDR through both ports (at least on SAMA5D4x), so we can use
764 * the same interface for source and dest, that solves the fact we
765 * don't know the direction.
767 u32 chan_cc = AT_XDMAC_CC_DAM_INCREMENTED_AM
768 | AT_XDMAC_CC_SAM_INCREMENTED_AM
771 | AT_XDMAC_CC_MBSIZE_SIXTEEN
772 | AT_XDMAC_CC_TYPE_MEM_TRAN;
774 dev_dbg(chan2dev(chan), "%s: src=%pad, dest=%pad, len=%zd, flags=0x%lx\n",
775 __func__, &src, &dest, len, flags);
781 * Check address alignment to select the greater data width we can use.
782 * Some XDMAC implementations don't provide dword transfer, in this
783 * case selecting dword has the same behavior as selecting word transfers.
785 if (!((src_addr | dst_addr) & 7)) {
786 dwidth = AT_XDMAC_CC_DWIDTH_DWORD;
787 dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__);
788 } else if (!((src_addr | dst_addr) & 3)) {
789 dwidth = AT_XDMAC_CC_DWIDTH_WORD;
790 dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__);
791 } else if (!((src_addr | dst_addr) & 1)) {
792 dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD;
793 dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__);
795 dwidth = AT_XDMAC_CC_DWIDTH_BYTE;
796 dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__);
799 /* Prepare descriptors. */
800 while (remaining_size) {
801 struct at_xdmac_desc *desc = NULL;
803 dev_dbg(chan2dev(chan), "%s: remaining_size=%zu\n", __func__, remaining_size);
805 spin_lock_bh(&atchan->lock);
806 desc = at_xdmac_get_desc(atchan);
807 spin_unlock_bh(&atchan->lock);
809 dev_err(chan2dev(chan), "can't get descriptor\n");
811 list_splice_init(&first->descs_list, &atchan->free_descs_list);
815 /* Update src and dest addresses. */
816 src_addr += xfer_size;
817 dst_addr += xfer_size;
819 if (remaining_size >= AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)
820 xfer_size = AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth;
822 xfer_size = remaining_size;
824 dev_dbg(chan2dev(chan), "%s: xfer_size=%zu\n", __func__, xfer_size);
826 /* Check remaining length and change data width if needed. */
827 if (!((src_addr | dst_addr | xfer_size) & 7)) {
828 dwidth = AT_XDMAC_CC_DWIDTH_DWORD;
829 dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__);
830 } else if (!((src_addr | dst_addr | xfer_size) & 3)) {
831 dwidth = AT_XDMAC_CC_DWIDTH_WORD;
832 dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__);
833 } else if (!((src_addr | dst_addr | xfer_size) & 1)) {
834 dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD;
835 dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__);
836 } else if ((src_addr | dst_addr | xfer_size) & 1) {
837 dwidth = AT_XDMAC_CC_DWIDTH_BYTE;
838 dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__);
840 chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
842 ublen = xfer_size >> dwidth;
843 remaining_size -= xfer_size;
845 desc->lld.mbr_sa = src_addr;
846 desc->lld.mbr_da = dst_addr;
847 desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2
848 | AT_XDMAC_MBR_UBC_NDEN
849 | AT_XDMAC_MBR_UBC_NSEN
850 | (remaining_size ? AT_XDMAC_MBR_UBC_NDE : 0)
852 desc->lld.mbr_cfg = chan_cc;
854 dev_dbg(chan2dev(chan),
855 "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n",
856 __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc, desc->lld.mbr_cfg);
860 prev->lld.mbr_nda = desc->tx_dma_desc.phys;
861 dev_dbg(chan2dev(chan),
862 "%s: chain lld: prev=0x%p, mbr_nda=0x%08x\n",
863 __func__, prev, prev->lld.mbr_nda);
870 dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
871 __func__, desc, first);
872 list_add_tail(&desc->desc_node, &first->descs_list);
875 first->tx_dma_desc.flags = flags;
876 first->xfer_size = len;
878 return &first->tx_dma_desc;
881 static enum dma_status
882 at_xdmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
883 struct dma_tx_state *txstate)
885 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
886 struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
887 struct at_xdmac_desc *desc, *_desc;
888 struct list_head *descs_list;
891 u32 cur_nda, mask, value;
892 u8 dwidth = at_xdmac_get_dwidth(atchan->cfg[AT_XDMAC_CUR_CFG]);
894 ret = dma_cookie_status(chan, cookie, txstate);
895 if (ret == DMA_COMPLETE)
901 spin_lock_bh(&atchan->lock);
903 desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node);
906 * If the transfer has not been started yet, don't need to compute the
907 * residue, it's the transfer length.
909 if (!desc->active_xfer) {
910 dma_set_residue(txstate, desc->xfer_size);
911 spin_unlock_bh(&atchan->lock);
915 residue = desc->xfer_size;
917 * Flush FIFO: only relevant when the transfer is source peripheral
920 mask = AT_XDMAC_CC_TYPE | AT_XDMAC_CC_DSYNC;
921 value = AT_XDMAC_CC_TYPE_PER_TRAN | AT_XDMAC_CC_DSYNC_PER2MEM;
922 if ((atchan->cfg[AT_XDMAC_CUR_CFG] & mask) == value) {
923 at_xdmac_write(atxdmac, AT_XDMAC_GSWF, atchan->mask);
924 while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS))
928 cur_nda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA) & 0xfffffffc;
930 * Remove size of all microblocks already transferred and the current
931 * one. Then add the remaining size to transfer of the current
934 descs_list = &desc->descs_list;
935 list_for_each_entry_safe(desc, _desc, descs_list, desc_node) {
936 residue -= (desc->lld.mbr_ubc & 0xffffff) << dwidth;
937 if ((desc->lld.mbr_nda & 0xfffffffc) == cur_nda)
940 residue += at_xdmac_chan_read(atchan, AT_XDMAC_CUBC) << dwidth;
942 spin_unlock_bh(&atchan->lock);
944 dma_set_residue(txstate, residue);
946 dev_dbg(chan2dev(chan),
947 "%s: desc=0x%p, tx_dma_desc.phys=%pad, tx_status=%d, cookie=%d, residue=%d\n",
948 __func__, desc, &desc->tx_dma_desc.phys, ret, cookie, residue);
953 /* Call must be protected by lock. */
954 static void at_xdmac_remove_xfer(struct at_xdmac_chan *atchan,
955 struct at_xdmac_desc *desc)
957 dev_dbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
960 * Remove the transfer from the transfer list then move the transfer
961 * descriptors into the free descriptors list.
963 list_del(&desc->xfer_node);
964 list_splice_init(&desc->descs_list, &atchan->free_descs_list);
967 static void at_xdmac_advance_work(struct at_xdmac_chan *atchan)
969 struct at_xdmac_desc *desc;
971 spin_lock_bh(&atchan->lock);
974 * If channel is enabled, do nothing, advance_work will be triggered
975 * after the interruption.
977 if (!at_xdmac_chan_is_enabled(atchan) && !list_empty(&atchan->xfers_list)) {
978 desc = list_first_entry(&atchan->xfers_list,
979 struct at_xdmac_desc,
981 dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
982 if (!desc->active_xfer)
983 at_xdmac_start_xfer(atchan, desc);
986 spin_unlock_bh(&atchan->lock);
989 static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan)
991 struct at_xdmac_desc *desc;
992 struct dma_async_tx_descriptor *txd;
994 desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node);
995 txd = &desc->tx_dma_desc;
997 if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT))
998 txd->callback(txd->callback_param);
1001 static void at_xdmac_tasklet(unsigned long data)
1003 struct at_xdmac_chan *atchan = (struct at_xdmac_chan *)data;
1004 struct at_xdmac_desc *desc;
1007 dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08lx\n",
1008 __func__, atchan->status);
1010 error_mask = AT_XDMAC_CIS_RBEIS
1011 | AT_XDMAC_CIS_WBEIS
1012 | AT_XDMAC_CIS_ROIS;
1014 if (at_xdmac_chan_is_cyclic(atchan)) {
1015 at_xdmac_handle_cyclic(atchan);
1016 } else if ((atchan->status & AT_XDMAC_CIS_LIS)
1017 || (atchan->status & error_mask)) {
1018 struct dma_async_tx_descriptor *txd;
1020 if (atchan->status & AT_XDMAC_CIS_RBEIS)
1021 dev_err(chan2dev(&atchan->chan), "read bus error!!!");
1022 if (atchan->status & AT_XDMAC_CIS_WBEIS)
1023 dev_err(chan2dev(&atchan->chan), "write bus error!!!");
1024 if (atchan->status & AT_XDMAC_CIS_ROIS)
1025 dev_err(chan2dev(&atchan->chan), "request overflow error!!!");
1027 spin_lock_bh(&atchan->lock);
1028 desc = list_first_entry(&atchan->xfers_list,
1029 struct at_xdmac_desc,
1031 dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
1032 BUG_ON(!desc->active_xfer);
1034 txd = &desc->tx_dma_desc;
1036 at_xdmac_remove_xfer(atchan, desc);
1037 spin_unlock_bh(&atchan->lock);
1039 if (!at_xdmac_chan_is_cyclic(atchan)) {
1040 dma_cookie_complete(txd);
1041 if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT))
1042 txd->callback(txd->callback_param);
1045 dma_run_dependencies(txd);
1047 at_xdmac_advance_work(atchan);
1051 static irqreturn_t at_xdmac_interrupt(int irq, void *dev_id)
1053 struct at_xdmac *atxdmac = (struct at_xdmac *)dev_id;
1054 struct at_xdmac_chan *atchan;
1055 u32 imr, status, pending;
1056 u32 chan_imr, chan_status;
1057 int i, ret = IRQ_NONE;
1060 imr = at_xdmac_read(atxdmac, AT_XDMAC_GIM);
1061 status = at_xdmac_read(atxdmac, AT_XDMAC_GIS);
1062 pending = status & imr;
1064 dev_vdbg(atxdmac->dma.dev,
1065 "%s: status=0x%08x, imr=0x%08x, pending=0x%08x\n",
1066 __func__, status, imr, pending);
1071 /* We have to find which channel has generated the interrupt. */
1072 for (i = 0; i < atxdmac->dma.chancnt; i++) {
1073 if (!((1 << i) & pending))
1076 atchan = &atxdmac->chan[i];
1077 chan_imr = at_xdmac_chan_read(atchan, AT_XDMAC_CIM);
1078 chan_status = at_xdmac_chan_read(atchan, AT_XDMAC_CIS);
1079 atchan->status = chan_status & chan_imr;
1080 dev_vdbg(atxdmac->dma.dev,
1081 "%s: chan%d: imr=0x%x, status=0x%x\n",
1082 __func__, i, chan_imr, chan_status);
1083 dev_vdbg(chan2dev(&atchan->chan),
1084 "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n",
1086 at_xdmac_chan_read(atchan, AT_XDMAC_CC),
1087 at_xdmac_chan_read(atchan, AT_XDMAC_CNDA),
1088 at_xdmac_chan_read(atchan, AT_XDMAC_CNDC),
1089 at_xdmac_chan_read(atchan, AT_XDMAC_CSA),
1090 at_xdmac_chan_read(atchan, AT_XDMAC_CDA),
1091 at_xdmac_chan_read(atchan, AT_XDMAC_CUBC));
1093 if (atchan->status & (AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS))
1094 at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask);
1096 tasklet_schedule(&atchan->tasklet);
1105 static void at_xdmac_issue_pending(struct dma_chan *chan)
1107 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1109 dev_dbg(chan2dev(&atchan->chan), "%s\n", __func__);
1111 if (!at_xdmac_chan_is_cyclic(atchan))
1112 at_xdmac_advance_work(atchan);
1117 static int at_xdmac_device_config(struct dma_chan *chan,
1118 struct dma_slave_config *config)
1120 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1123 dev_dbg(chan2dev(chan), "%s\n", __func__);
1125 spin_lock_bh(&atchan->lock);
1126 ret = at_xdmac_set_slave_config(chan, config);
1127 spin_unlock_bh(&atchan->lock);
1132 static int at_xdmac_device_pause(struct dma_chan *chan)
1134 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1135 struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
1137 dev_dbg(chan2dev(chan), "%s\n", __func__);
1139 spin_lock_bh(&atchan->lock);
1140 at_xdmac_write(atxdmac, AT_XDMAC_GRWS, atchan->mask);
1141 set_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
1142 spin_unlock_bh(&atchan->lock);
1147 static int at_xdmac_device_resume(struct dma_chan *chan)
1149 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1150 struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
1152 dev_dbg(chan2dev(chan), "%s\n", __func__);
1154 spin_lock_bh(&atchan->lock);
1155 if (!at_xdmac_chan_is_paused(atchan))
1158 at_xdmac_write(atxdmac, AT_XDMAC_GRWR, atchan->mask);
1159 clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
1160 spin_unlock_bh(&atchan->lock);
1165 static int at_xdmac_device_terminate_all(struct dma_chan *chan)
1167 struct at_xdmac_desc *desc, *_desc;
1168 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1169 struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
1171 dev_dbg(chan2dev(chan), "%s\n", __func__);
1173 spin_lock_bh(&atchan->lock);
1174 at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask);
1175 while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask)
1178 /* Cancel all pending transfers. */
1179 list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node)
1180 at_xdmac_remove_xfer(atchan, desc);
1182 clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status);
1183 spin_unlock_bh(&atchan->lock);
1188 static int at_xdmac_alloc_chan_resources(struct dma_chan *chan)
1190 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1191 struct at_xdmac_desc *desc;
1194 spin_lock_bh(&atchan->lock);
1196 if (at_xdmac_chan_is_enabled(atchan)) {
1197 dev_err(chan2dev(chan),
1198 "can't allocate channel resources (channel enabled)\n");
1203 if (!list_empty(&atchan->free_descs_list)) {
1204 dev_err(chan2dev(chan),
1205 "can't allocate channel resources (channel not free from a previous use)\n");
1210 for (i = 0; i < init_nr_desc_per_channel; i++) {
1211 desc = at_xdmac_alloc_desc(chan, GFP_ATOMIC);
1213 dev_warn(chan2dev(chan),
1214 "only %d descriptors have been allocated\n", i);
1217 list_add_tail(&desc->desc_node, &atchan->free_descs_list);
1220 dma_cookie_init(chan);
1222 dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i);
1225 spin_unlock_bh(&atchan->lock);
1229 static void at_xdmac_free_chan_resources(struct dma_chan *chan)
1231 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1232 struct at_xdmac *atxdmac = to_at_xdmac(chan->device);
1233 struct at_xdmac_desc *desc, *_desc;
1235 list_for_each_entry_safe(desc, _desc, &atchan->free_descs_list, desc_node) {
1236 dev_dbg(chan2dev(chan), "%s: freeing descriptor %p\n", __func__, desc);
1237 list_del(&desc->desc_node);
1238 dma_pool_free(atxdmac->at_xdmac_desc_pool, desc, desc->tx_dma_desc.phys);
1245 static int atmel_xdmac_prepare(struct device *dev)
1247 struct platform_device *pdev = to_platform_device(dev);
1248 struct at_xdmac *atxdmac = platform_get_drvdata(pdev);
1249 struct dma_chan *chan, *_chan;
1251 list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) {
1252 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1254 /* Wait for transfer completion, except in cyclic case. */
1255 if (at_xdmac_chan_is_enabled(atchan) && !at_xdmac_chan_is_cyclic(atchan))
1261 # define atmel_xdmac_prepare NULL
1264 #ifdef CONFIG_PM_SLEEP
1265 static int atmel_xdmac_suspend(struct device *dev)
1267 struct platform_device *pdev = to_platform_device(dev);
1268 struct at_xdmac *atxdmac = platform_get_drvdata(pdev);
1269 struct dma_chan *chan, *_chan;
1271 list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) {
1272 struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
1274 if (at_xdmac_chan_is_cyclic(atchan)) {
1275 if (!at_xdmac_chan_is_paused(atchan))
1276 at_xdmac_device_pause(chan);
1277 atchan->save_cim = at_xdmac_chan_read(atchan, AT_XDMAC_CIM);
1278 atchan->save_cnda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA);
1279 atchan->save_cndc = at_xdmac_chan_read(atchan, AT_XDMAC_CNDC);
1282 atxdmac->save_gim = at_xdmac_read(atxdmac, AT_XDMAC_GIM);
1284 at_xdmac_off(atxdmac);
1285 clk_disable_unprepare(atxdmac->clk);
1289 static int atmel_xdmac_resume(struct device *dev)
1291 struct platform_device *pdev = to_platform_device(dev);
1292 struct at_xdmac *atxdmac = platform_get_drvdata(pdev);
1293 struct at_xdmac_chan *atchan;
1294 struct dma_chan *chan, *_chan;
1298 clk_prepare_enable(atxdmac->clk);
1300 /* Clear pending interrupts. */
1301 for (i = 0; i < atxdmac->dma.chancnt; i++) {
1302 atchan = &atxdmac->chan[i];
1303 while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS))
1307 at_xdmac_write(atxdmac, AT_XDMAC_GIE, atxdmac->save_gim);
1308 at_xdmac_write(atxdmac, AT_XDMAC_GE, atxdmac->save_gs);
1309 list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) {
1310 atchan = to_at_xdmac_chan(chan);
1311 cfg = atchan->cfg[AT_XDMAC_CUR_CFG];
1312 at_xdmac_chan_write(atchan, AT_XDMAC_CC, cfg);
1313 if (at_xdmac_chan_is_cyclic(atchan)) {
1314 at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda);
1315 at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc);
1316 at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim);
1318 at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask);
1323 #endif /* CONFIG_PM_SLEEP */
1325 static int at_xdmac_probe(struct platform_device *pdev)
1327 struct resource *res;
1328 struct at_xdmac *atxdmac;
1329 int irq, size, nr_channels, i, ret;
1333 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1337 irq = platform_get_irq(pdev, 0);
1341 base = devm_ioremap_resource(&pdev->dev, res);
1343 return PTR_ERR(base);
1346 * Read number of xdmac channels, read helper function can't be used
1347 * since atxdmac is not yet allocated and we need to know the number
1348 * of channels to do the allocation.
1350 reg = readl_relaxed(base + AT_XDMAC_GTYPE);
1351 nr_channels = AT_XDMAC_NB_CH(reg);
1352 if (nr_channels > AT_XDMAC_MAX_CHAN) {
1353 dev_err(&pdev->dev, "invalid number of channels (%u)\n",
1358 size = sizeof(*atxdmac);
1359 size += nr_channels * sizeof(struct at_xdmac_chan);
1360 atxdmac = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
1362 dev_err(&pdev->dev, "can't allocate at_xdmac structure\n");
1366 atxdmac->regs = base;
1369 atxdmac->clk = devm_clk_get(&pdev->dev, "dma_clk");
1370 if (IS_ERR(atxdmac->clk)) {
1371 dev_err(&pdev->dev, "can't get dma_clk\n");
1372 return PTR_ERR(atxdmac->clk);
1375 /* Do not use dev res to prevent races with tasklet */
1376 ret = request_irq(atxdmac->irq, at_xdmac_interrupt, 0, "at_xdmac", atxdmac);
1378 dev_err(&pdev->dev, "can't request irq\n");
1382 ret = clk_prepare_enable(atxdmac->clk);
1384 dev_err(&pdev->dev, "can't prepare or enable clock\n");
1388 atxdmac->at_xdmac_desc_pool =
1389 dmam_pool_create(dev_name(&pdev->dev), &pdev->dev,
1390 sizeof(struct at_xdmac_desc), 4, 0);
1391 if (!atxdmac->at_xdmac_desc_pool) {
1392 dev_err(&pdev->dev, "no memory for descriptors dma pool\n");
1394 goto err_clk_disable;
1397 dma_cap_set(DMA_CYCLIC, atxdmac->dma.cap_mask);
1398 dma_cap_set(DMA_MEMCPY, atxdmac->dma.cap_mask);
1399 dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask);
1401 * Without DMA_PRIVATE the driver is not able to allocate more than
1402 * one channel, second allocation fails in private_candidate.
1404 dma_cap_set(DMA_PRIVATE, atxdmac->dma.cap_mask);
1405 atxdmac->dma.dev = &pdev->dev;
1406 atxdmac->dma.device_alloc_chan_resources = at_xdmac_alloc_chan_resources;
1407 atxdmac->dma.device_free_chan_resources = at_xdmac_free_chan_resources;
1408 atxdmac->dma.device_tx_status = at_xdmac_tx_status;
1409 atxdmac->dma.device_issue_pending = at_xdmac_issue_pending;
1410 atxdmac->dma.device_prep_dma_cyclic = at_xdmac_prep_dma_cyclic;
1411 atxdmac->dma.device_prep_dma_memcpy = at_xdmac_prep_dma_memcpy;
1412 atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg;
1413 atxdmac->dma.device_config = at_xdmac_device_config;
1414 atxdmac->dma.device_pause = at_xdmac_device_pause;
1415 atxdmac->dma.device_resume = at_xdmac_device_resume;
1416 atxdmac->dma.device_terminate_all = at_xdmac_device_terminate_all;
1417 atxdmac->dma.src_addr_widths = AT_XDMAC_DMA_BUSWIDTHS;
1418 atxdmac->dma.dst_addr_widths = AT_XDMAC_DMA_BUSWIDTHS;
1419 atxdmac->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
1420 atxdmac->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1422 /* Disable all chans and interrupts. */
1423 at_xdmac_off(atxdmac);
1425 /* Init channels. */
1426 INIT_LIST_HEAD(&atxdmac->dma.channels);
1427 for (i = 0; i < nr_channels; i++) {
1428 struct at_xdmac_chan *atchan = &atxdmac->chan[i];
1430 atchan->chan.device = &atxdmac->dma;
1431 list_add_tail(&atchan->chan.device_node,
1432 &atxdmac->dma.channels);
1434 atchan->ch_regs = at_xdmac_chan_reg_base(atxdmac, i);
1435 atchan->mask = 1 << i;
1437 spin_lock_init(&atchan->lock);
1438 INIT_LIST_HEAD(&atchan->xfers_list);
1439 INIT_LIST_HEAD(&atchan->free_descs_list);
1440 tasklet_init(&atchan->tasklet, at_xdmac_tasklet,
1441 (unsigned long)atchan);
1443 /* Clear pending interrupts. */
1444 while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS))
1447 platform_set_drvdata(pdev, atxdmac);
1449 ret = dma_async_device_register(&atxdmac->dma);
1451 dev_err(&pdev->dev, "fail to register DMA engine device\n");
1452 goto err_clk_disable;
1455 ret = of_dma_controller_register(pdev->dev.of_node,
1456 at_xdmac_xlate, atxdmac);
1458 dev_err(&pdev->dev, "could not register of dma controller\n");
1459 goto err_dma_unregister;
1462 dev_info(&pdev->dev, "%d channels, mapped at 0x%p\n",
1463 nr_channels, atxdmac->regs);
1468 dma_async_device_unregister(&atxdmac->dma);
1470 clk_disable_unprepare(atxdmac->clk);
1472 free_irq(atxdmac->irq, atxdmac->dma.dev);
1476 static int at_xdmac_remove(struct platform_device *pdev)
1478 struct at_xdmac *atxdmac = (struct at_xdmac *)platform_get_drvdata(pdev);
1481 at_xdmac_off(atxdmac);
1482 of_dma_controller_free(pdev->dev.of_node);
1483 dma_async_device_unregister(&atxdmac->dma);
1484 clk_disable_unprepare(atxdmac->clk);
1486 synchronize_irq(atxdmac->irq);
1488 free_irq(atxdmac->irq, atxdmac->dma.dev);
1490 for (i = 0; i < atxdmac->dma.chancnt; i++) {
1491 struct at_xdmac_chan *atchan = &atxdmac->chan[i];
1493 tasklet_kill(&atchan->tasklet);
1494 at_xdmac_free_chan_resources(&atchan->chan);
1500 static const struct dev_pm_ops atmel_xdmac_dev_pm_ops = {
1501 .prepare = atmel_xdmac_prepare,
1502 SET_LATE_SYSTEM_SLEEP_PM_OPS(atmel_xdmac_suspend, atmel_xdmac_resume)
1505 static const struct of_device_id atmel_xdmac_dt_ids[] = {
1507 .compatible = "atmel,sama5d4-dma",
1512 MODULE_DEVICE_TABLE(of, atmel_xdmac_dt_ids);
1514 static struct platform_driver at_xdmac_driver = {
1515 .probe = at_xdmac_probe,
1516 .remove = at_xdmac_remove,
1519 .owner = THIS_MODULE,
1520 .of_match_table = of_match_ptr(atmel_xdmac_dt_ids),
1521 .pm = &atmel_xdmac_dev_pm_ops,
1525 static int __init at_xdmac_init(void)
1527 return platform_driver_probe(&at_xdmac_driver, at_xdmac_probe);
1529 subsys_initcall(at_xdmac_init);
1531 MODULE_DESCRIPTION("Atmel Extended DMA Controller driver");
1532 MODULE_AUTHOR("Ludovic Desroches <ludovic.desroches@atmel.com>");
1533 MODULE_LICENSE("GPL");