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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Header file for the Atmel AHB DMA Controller driver
4 *
5 * Copyright (C) 2008 Atmel Corporation
6 */
7#ifndef AT_HDMAC_REGS_H
8#define AT_HDMAC_REGS_H
9
10#define AT_DMA_MAX_NR_CHANNELS 8
11
12
13#define AT_DMA_GCFG 0x00 /* Global Configuration Register */
14#define AT_DMA_IF_BIGEND(i) (0x1 << (i)) /* AHB-Lite Interface i in Big-endian mode */
15#define AT_DMA_ARB_CFG (0x1 << 4) /* Arbiter mode. */
16#define AT_DMA_ARB_CFG_FIXED (0x0 << 4)
17#define AT_DMA_ARB_CFG_ROUND_ROBIN (0x1 << 4)
18
19#define AT_DMA_EN 0x04 /* Controller Enable Register */
20#define AT_DMA_ENABLE (0x1 << 0)
21
22#define AT_DMA_SREQ 0x08 /* Software Single Request Register */
23#define AT_DMA_SSREQ(x) (0x1 << ((x) << 1)) /* Request a source single transfer on channel x */
24#define AT_DMA_DSREQ(x) (0x1 << (1 + ((x) << 1))) /* Request a destination single transfer on channel x */
25
26#define AT_DMA_CREQ 0x0C /* Software Chunk Transfer Request Register */
27#define AT_DMA_SCREQ(x) (0x1 << ((x) << 1)) /* Request a source chunk transfer on channel x */
28#define AT_DMA_DCREQ(x) (0x1 << (1 + ((x) << 1))) /* Request a destination chunk transfer on channel x */
29
30#define AT_DMA_LAST 0x10 /* Software Last Transfer Flag Register */
31#define AT_DMA_SLAST(x) (0x1 << ((x) << 1)) /* This src rq is last tx of buffer on channel x */
32#define AT_DMA_DLAST(x) (0x1 << (1 + ((x) << 1))) /* This dst rq is last tx of buffer on channel x */
33
34#define AT_DMA_SYNC 0x14 /* Request Synchronization Register */
35#define AT_DMA_SYR(h) (0x1 << (h)) /* Synchronize handshake line h */
36
37/* Error, Chained Buffer transfer completed and Buffer transfer completed Interrupt registers */
38#define AT_DMA_EBCIER 0x18 /* Enable register */
39#define AT_DMA_EBCIDR 0x1C /* Disable register */
40#define AT_DMA_EBCIMR 0x20 /* Mask Register */
41#define AT_DMA_EBCISR 0x24 /* Status Register */
42#define AT_DMA_CBTC_OFFSET 8
43#define AT_DMA_ERR_OFFSET 16
44#define AT_DMA_BTC(x) (0x1 << (x))
45#define AT_DMA_CBTC(x) (0x1 << (AT_DMA_CBTC_OFFSET + (x)))
46#define AT_DMA_ERR(x) (0x1 << (AT_DMA_ERR_OFFSET + (x)))
47
48#define AT_DMA_CHER 0x28 /* Channel Handler Enable Register */
49#define AT_DMA_ENA(x) (0x1 << (x))
50#define AT_DMA_SUSP(x) (0x1 << ( 8 + (x)))
51#define AT_DMA_KEEP(x) (0x1 << (24 + (x)))
52
53#define AT_DMA_CHDR 0x2C /* Channel Handler Disable Register */
54#define AT_DMA_DIS(x) (0x1 << (x))
55#define AT_DMA_RES(x) (0x1 << ( 8 + (x)))
56
57#define AT_DMA_CHSR 0x30 /* Channel Handler Status Register */
58#define AT_DMA_EMPT(x) (0x1 << (16 + (x)))
59#define AT_DMA_STAL(x) (0x1 << (24 + (x)))
60
61
62#define AT_DMA_CH_REGS_BASE 0x3C /* Channel registers base address */
63#define ch_regs(x) (AT_DMA_CH_REGS_BASE + (x) * 0x28) /* Channel x base addr */
64
65/* Hardware register offset for each channel */
66#define ATC_SADDR_OFFSET 0x00 /* Source Address Register */
67#define ATC_DADDR_OFFSET 0x04 /* Destination Address Register */
68#define ATC_DSCR_OFFSET 0x08 /* Descriptor Address Register */
69#define ATC_CTRLA_OFFSET 0x0C /* Control A Register */
70#define ATC_CTRLB_OFFSET 0x10 /* Control B Register */
71#define ATC_CFG_OFFSET 0x14 /* Configuration Register */
72#define ATC_SPIP_OFFSET 0x18 /* Src PIP Configuration Register */
73#define ATC_DPIP_OFFSET 0x1C /* Dst PIP Configuration Register */
74
75
76/* Bitfield definitions */
77
78/* Bitfields in DSCR */
79#define ATC_DSCR_IF(i) (0x3 & (i)) /* Dsc feched via AHB-Lite Interface i */
80
81/* Bitfields in CTRLA */
82#define ATC_BTSIZE_MAX 0xFFFFUL /* Maximum Buffer Transfer Size */
83#define ATC_BTSIZE(x) (ATC_BTSIZE_MAX & (x)) /* Buffer Transfer Size */
84#define ATC_SCSIZE_MASK (0x7 << 16) /* Source Chunk Transfer Size */
85#define ATC_SCSIZE(x) (ATC_SCSIZE_MASK & ((x) << 16))
86#define ATC_SCSIZE_1 (0x0 << 16)
87#define ATC_SCSIZE_4 (0x1 << 16)
88#define ATC_SCSIZE_8 (0x2 << 16)
89#define ATC_SCSIZE_16 (0x3 << 16)
90#define ATC_SCSIZE_32 (0x4 << 16)
91#define ATC_SCSIZE_64 (0x5 << 16)
92#define ATC_SCSIZE_128 (0x6 << 16)
93#define ATC_SCSIZE_256 (0x7 << 16)
94#define ATC_DCSIZE_MASK (0x7 << 20) /* Destination Chunk Transfer Size */
95#define ATC_DCSIZE(x) (ATC_DCSIZE_MASK & ((x) << 20))
96#define ATC_DCSIZE_1 (0x0 << 20)
97#define ATC_DCSIZE_4 (0x1 << 20)
98#define ATC_DCSIZE_8 (0x2 << 20)
99#define ATC_DCSIZE_16 (0x3 << 20)
100#define ATC_DCSIZE_32 (0x4 << 20)
101#define ATC_DCSIZE_64 (0x5 << 20)
102#define ATC_DCSIZE_128 (0x6 << 20)
103#define ATC_DCSIZE_256 (0x7 << 20)
104#define ATC_SRC_WIDTH_MASK (0x3 << 24) /* Source Single Transfer Size */
105#define ATC_SRC_WIDTH(x) ((x) << 24)
106#define ATC_SRC_WIDTH_BYTE (0x0 << 24)
107#define ATC_SRC_WIDTH_HALFWORD (0x1 << 24)
108#define ATC_SRC_WIDTH_WORD (0x2 << 24)
109#define ATC_REG_TO_SRC_WIDTH(r) (((r) >> 24) & 0x3)
110#define ATC_DST_WIDTH_MASK (0x3 << 28) /* Destination Single Transfer Size */
111#define ATC_DST_WIDTH(x) ((x) << 28)
112#define ATC_DST_WIDTH_BYTE (0x0 << 28)
113#define ATC_DST_WIDTH_HALFWORD (0x1 << 28)
114#define ATC_DST_WIDTH_WORD (0x2 << 28)
115#define ATC_DONE (0x1 << 31) /* Tx Done (only written back in descriptor) */
116
117/* Bitfields in CTRLB */
118#define ATC_SIF(i) (0x3 & (i)) /* Src tx done via AHB-Lite Interface i */
119#define ATC_DIF(i) ((0x3 & (i)) << 4) /* Dst tx done via AHB-Lite Interface i */
120 /* Specify AHB interfaces */
121#define AT_DMA_MEM_IF 0 /* interface 0 as memory interface */
122#define AT_DMA_PER_IF 1 /* interface 1 as peripheral interface */
123
124#define ATC_SRC_PIP (0x1 << 8) /* Source Picture-in-Picture enabled */
125#define ATC_DST_PIP (0x1 << 12) /* Destination Picture-in-Picture enabled */
126#define ATC_SRC_DSCR_DIS (0x1 << 16) /* Src Descriptor fetch disable */
127#define ATC_DST_DSCR_DIS (0x1 << 20) /* Dst Descriptor fetch disable */
128#define ATC_FC_MASK (0x7 << 21) /* Choose Flow Controller */
129#define ATC_FC_MEM2MEM (0x0 << 21) /* Mem-to-Mem (DMA) */
130#define ATC_FC_MEM2PER (0x1 << 21) /* Mem-to-Periph (DMA) */
131#define ATC_FC_PER2MEM (0x2 << 21) /* Periph-to-Mem (DMA) */
132#define ATC_FC_PER2PER (0x3 << 21) /* Periph-to-Periph (DMA) */
133#define ATC_FC_PER2MEM_PER (0x4 << 21) /* Periph-to-Mem (Peripheral) */
134#define ATC_FC_MEM2PER_PER (0x5 << 21) /* Mem-to-Periph (Peripheral) */
135#define ATC_FC_PER2PER_SRCPER (0x6 << 21) /* Periph-to-Periph (Src Peripheral) */
136#define ATC_FC_PER2PER_DSTPER (0x7 << 21) /* Periph-to-Periph (Dst Peripheral) */
137#define ATC_SRC_ADDR_MODE_MASK (0x3 << 24)
138#define ATC_SRC_ADDR_MODE_INCR (0x0 << 24) /* Incrementing Mode */
139#define ATC_SRC_ADDR_MODE_DECR (0x1 << 24) /* Decrementing Mode */
140#define ATC_SRC_ADDR_MODE_FIXED (0x2 << 24) /* Fixed Mode */
141#define ATC_DST_ADDR_MODE_MASK (0x3 << 28)
142#define ATC_DST_ADDR_MODE_INCR (0x0 << 28) /* Incrementing Mode */
143#define ATC_DST_ADDR_MODE_DECR (0x1 << 28) /* Decrementing Mode */
144#define ATC_DST_ADDR_MODE_FIXED (0x2 << 28) /* Fixed Mode */
145#define ATC_IEN (0x1 << 30) /* BTC interrupt enable (active low) */
146#define ATC_AUTO (0x1 << 31) /* Auto multiple buffer tx enable */
147
148/* Bitfields in CFG */
149#define ATC_PER_MSB(h) ((0x30U & (h)) >> 4) /* Extract most significant bits of a handshaking identifier */
150
151#define ATC_SRC_PER(h) (0xFU & (h)) /* Channel src rq associated with periph handshaking ifc h */
152#define ATC_DST_PER(h) ((0xFU & (h)) << 4) /* Channel dst rq associated with periph handshaking ifc h */
153#define ATC_SRC_REP (0x1 << 8) /* Source Replay Mod */
154#define ATC_SRC_H2SEL (0x1 << 9) /* Source Handshaking Mod */
155#define ATC_SRC_H2SEL_SW (0x0 << 9)
156#define ATC_SRC_H2SEL_HW (0x1 << 9)
157#define ATC_SRC_PER_MSB(h) (ATC_PER_MSB(h) << 10) /* Channel src rq (most significant bits) */
158#define ATC_DST_REP (0x1 << 12) /* Destination Replay Mod */
159#define ATC_DST_H2SEL (0x1 << 13) /* Destination Handshaking Mod */
160#define ATC_DST_H2SEL_SW (0x0 << 13)
161#define ATC_DST_H2SEL_HW (0x1 << 13)
162#define ATC_DST_PER_MSB(h) (ATC_PER_MSB(h) << 14) /* Channel dst rq (most significant bits) */
163#define ATC_SOD (0x1 << 16) /* Stop On Done */
164#define ATC_LOCK_IF (0x1 << 20) /* Interface Lock */
165#define ATC_LOCK_B (0x1 << 21) /* AHB Bus Lock */
166#define ATC_LOCK_IF_L (0x1 << 22) /* Master Interface Arbiter Lock */
167#define ATC_LOCK_IF_L_CHUNK (0x0 << 22)
168#define ATC_LOCK_IF_L_BUFFER (0x1 << 22)
169#define ATC_AHB_PROT_MASK (0x7 << 24) /* AHB Protection */
170#define ATC_FIFOCFG_MASK (0x3 << 28) /* FIFO Request Configuration */
171#define ATC_FIFOCFG_LARGESTBURST (0x0 << 28)
172#define ATC_FIFOCFG_HALFFIFO (0x1 << 28)
173#define ATC_FIFOCFG_ENOUGHSPACE (0x2 << 28)
174
175/* Bitfields in SPIP */
176#define ATC_SPIP_HOLE(x) (0xFFFFU & (x))
177#define ATC_SPIP_BOUNDARY(x) ((0x3FF & (x)) << 16)
178
179/* Bitfields in DPIP */
180#define ATC_DPIP_HOLE(x) (0xFFFFU & (x))
181#define ATC_DPIP_BOUNDARY(x) ((0x3FF & (x)) << 16)
182
183
184/*-- descriptors -----------------------------------------------------*/
185
186/* LLI == Linked List Item; aka DMA buffer descriptor */
187struct at_lli {
188 /* values that are not changed by hardware */
189 dma_addr_t saddr;
190 dma_addr_t daddr;
191 /* value that may get written back: */
192 u32 ctrla;
193 /* more values that are not changed by hardware */
194 u32 ctrlb;
195 dma_addr_t dscr; /* chain to next lli */
196};
197
198/**
199 * struct at_desc - software descriptor
200 * @at_lli: hardware lli structure
201 * @txd: support for the async_tx api
202 * @desc_node: node on the channed descriptors list
203 * @len: descriptor byte count
204 * @total_len: total transaction byte count
205 */
206struct at_desc {
207 /* FIRST values the hardware uses */
208 struct at_lli lli;
209
210 /* THEN values for driver housekeeping */
211 struct list_head tx_list;
212 struct dma_async_tx_descriptor txd;
213 struct list_head desc_node;
214 size_t len;
215 size_t total_len;
216
217 /* Interleaved data */
218 size_t boundary;
219 size_t dst_hole;
220 size_t src_hole;
221
222 /* Memset temporary buffer */
223 bool memset_buffer;
224 dma_addr_t memset_paddr;
225 int *memset_vaddr;
226};
227
228static inline struct at_desc *
229txd_to_at_desc(struct dma_async_tx_descriptor *txd)
230{
231 return container_of(txd, struct at_desc, txd);
232}
233
234
235/*-- Channels --------------------------------------------------------*/
236
237/**
238 * atc_status - information bits stored in channel status flag
239 *
240 * Manipulated with atomic operations.
241 */
242enum atc_status {
243 ATC_IS_ERROR = 0,
244 ATC_IS_PAUSED = 1,
245 ATC_IS_CYCLIC = 24,
246};
247
248/**
249 * struct at_dma_chan - internal representation of an Atmel HDMAC channel
250 * @chan_common: common dmaengine channel object members
251 * @device: parent device
252 * @ch_regs: memory mapped register base
253 * @mask: channel index in a mask
254 * @per_if: peripheral interface
255 * @mem_if: memory interface
256 * @status: transmit status information from irq/prep* functions
257 * to tasklet (use atomic operations)
258 * @tasklet: bottom half to finish transaction work
259 * @save_cfg: configuration register that is saved on suspend/resume cycle
260 * @save_dscr: for cyclic operations, preserve next descriptor address in
261 * the cyclic list on suspend/resume cycle
262 * @dma_sconfig: configuration for slave transfers, passed via
263 * .device_config
264 * @lock: serializes enqueue/dequeue operations to descriptors lists
265 * @active_list: list of descriptors dmaengine is being running on
266 * @queue: list of descriptors ready to be submitted to engine
267 * @free_list: list of descriptors usable by the channel
268 */
269struct at_dma_chan {
270 struct dma_chan chan_common;
271 struct at_dma *device;
272 void __iomem *ch_regs;
273 u8 mask;
274 u8 per_if;
275 u8 mem_if;
276 unsigned long status;
277 struct tasklet_struct tasklet;
278 u32 save_cfg;
279 u32 save_dscr;
280 struct dma_slave_config dma_sconfig;
281
282 spinlock_t lock;
283
284 /* these other elements are all protected by lock */
285 struct list_head active_list;
286 struct list_head queue;
287 struct list_head free_list;
288};
289
290#define channel_readl(atchan, name) \
291 __raw_readl((atchan)->ch_regs + ATC_##name##_OFFSET)
292
293#define channel_writel(atchan, name, val) \
294 __raw_writel((val), (atchan)->ch_regs + ATC_##name##_OFFSET)
295
296static inline struct at_dma_chan *to_at_dma_chan(struct dma_chan *dchan)
297{
298 return container_of(dchan, struct at_dma_chan, chan_common);
299}
300
301/*
302 * Fix sconfig's burst size according to at_hdmac. We need to convert them as:
303 * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3, 32 -> 4, 64 -> 5, 128 -> 6, 256 -> 7.
304 *
305 * This can be done by finding most significant bit set.
306 */
307static inline void convert_burst(u32 *maxburst)
308{
309 if (*maxburst > 1)
310 *maxburst = fls(*maxburst) - 2;
311 else
312 *maxburst = 0;
313}
314
315/*
316 * Fix sconfig's bus width according to at_hdmac.
317 * 1 byte -> 0, 2 bytes -> 1, 4 bytes -> 2.
318 */
319static inline u8 convert_buswidth(enum dma_slave_buswidth addr_width)
320{
321 switch (addr_width) {
322 case DMA_SLAVE_BUSWIDTH_2_BYTES:
323 return 1;
324 case DMA_SLAVE_BUSWIDTH_4_BYTES:
325 return 2;
326 default:
327 /* For 1 byte width or fallback */
328 return 0;
329 }
330}
331
332/*-- Controller ------------------------------------------------------*/
333
334/**
335 * struct at_dma - internal representation of an Atmel HDMA Controller
336 * @chan_common: common dmaengine dma_device object members
337 * @atdma_devtype: identifier of DMA controller compatibility
338 * @ch_regs: memory mapped register base
339 * @clk: dma controller clock
340 * @save_imr: interrupt mask register that is saved on suspend/resume cycle
341 * @all_chan_mask: all channels availlable in a mask
342 * @dma_desc_pool: base of DMA descriptor region (DMA address)
343 * @chan: channels table to store at_dma_chan structures
344 */
345struct at_dma {
346 struct dma_device dma_common;
347 void __iomem *regs;
348 struct clk *clk;
349 u32 save_imr;
350
351 u8 all_chan_mask;
352
353 struct dma_pool *dma_desc_pool;
354 struct dma_pool *memset_pool;
355 /* AT THE END channels table */
356 struct at_dma_chan chan[];
357};
358
359#define dma_readl(atdma, name) \
360 __raw_readl((atdma)->regs + AT_DMA_##name)
361#define dma_writel(atdma, name, val) \
362 __raw_writel((val), (atdma)->regs + AT_DMA_##name)
363
364static inline struct at_dma *to_at_dma(struct dma_device *ddev)
365{
366 return container_of(ddev, struct at_dma, dma_common);
367}
368
369
370/*-- Helper functions ------------------------------------------------*/
371
372static struct device *chan2dev(struct dma_chan *chan)
373{
374 return &chan->dev->device;
375}
376
377#if defined(VERBOSE_DEBUG)
378static void vdbg_dump_regs(struct at_dma_chan *atchan)
379{
380 struct at_dma *atdma = to_at_dma(atchan->chan_common.device);
381
382 dev_err(chan2dev(&atchan->chan_common),
383 " channel %d : imr = 0x%x, chsr = 0x%x\n",
384 atchan->chan_common.chan_id,
385 dma_readl(atdma, EBCIMR),
386 dma_readl(atdma, CHSR));
387
388 dev_err(chan2dev(&atchan->chan_common),
389 " channel: s0x%x d0x%x ctrl0x%x:0x%x cfg0x%x l0x%x\n",
390 channel_readl(atchan, SADDR),
391 channel_readl(atchan, DADDR),
392 channel_readl(atchan, CTRLA),
393 channel_readl(atchan, CTRLB),
394 channel_readl(atchan, CFG),
395 channel_readl(atchan, DSCR));
396}
397#else
398static void vdbg_dump_regs(struct at_dma_chan *atchan) {}
399#endif
400
401static void atc_dump_lli(struct at_dma_chan *atchan, struct at_lli *lli)
402{
403 dev_crit(chan2dev(&atchan->chan_common),
404 "desc: s%pad d%pad ctrl0x%x:0x%x l%pad\n",
405 &lli->saddr, &lli->daddr,
406 lli->ctrla, lli->ctrlb, &lli->dscr);
407}
408
409
410static void atc_setup_irq(struct at_dma *atdma, int chan_id, int on)
411{
412 u32 ebci;
413
414 /* enable interrupts on buffer transfer completion & error */
415 ebci = AT_DMA_BTC(chan_id)
416 | AT_DMA_ERR(chan_id);
417 if (on)
418 dma_writel(atdma, EBCIER, ebci);
419 else
420 dma_writel(atdma, EBCIDR, ebci);
421}
422
423static void atc_enable_chan_irq(struct at_dma *atdma, int chan_id)
424{
425 atc_setup_irq(atdma, chan_id, 1);
426}
427
428static void atc_disable_chan_irq(struct at_dma *atdma, int chan_id)
429{
430 atc_setup_irq(atdma, chan_id, 0);
431}
432
433
434/**
435 * atc_chan_is_enabled - test if given channel is enabled
436 * @atchan: channel we want to test status
437 */
438static inline int atc_chan_is_enabled(struct at_dma_chan *atchan)
439{
440 struct at_dma *atdma = to_at_dma(atchan->chan_common.device);
441
442 return !!(dma_readl(atdma, CHSR) & atchan->mask);
443}
444
445/**
446 * atc_chan_is_paused - test channel pause/resume status
447 * @atchan: channel we want to test status
448 */
449static inline int atc_chan_is_paused(struct at_dma_chan *atchan)
450{
451 return test_bit(ATC_IS_PAUSED, &atchan->status);
452}
453
454/**
455 * atc_chan_is_cyclic - test if given channel has cyclic property set
456 * @atchan: channel we want to test status
457 */
458static inline int atc_chan_is_cyclic(struct at_dma_chan *atchan)
459{
460 return test_bit(ATC_IS_CYCLIC, &atchan->status);
461}
462
463/**
464 * set_desc_eol - set end-of-link to descriptor so it will end transfer
465 * @desc: descriptor, signle or at the end of a chain, to end chain on
466 */
467static void set_desc_eol(struct at_desc *desc)
468{
469 u32 ctrlb = desc->lli.ctrlb;
470
471 ctrlb &= ~ATC_IEN;
472 ctrlb |= ATC_SRC_DSCR_DIS | ATC_DST_DSCR_DIS;
473
474 desc->lli.ctrlb = ctrlb;
475 desc->lli.dscr = 0;
476}
477
478#endif /* AT_HDMAC_REGS_H */