Commit | Line | Data |
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8d318a50 LW |
1 | /* |
2 | * driver/dma/ste_dma40.c | |
3 | * | |
4 | * Copyright (C) ST-Ericsson 2007-2010 | |
5 | * License terms: GNU General Public License (GPL) version 2 | |
6 | * Author: Per Friden <per.friden@stericsson.com> | |
7 | * Author: Jonas Aaberg <jonas.aberg@stericsson.com> | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/dmaengine.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/clk.h> | |
16 | #include <linux/delay.h> | |
17 | ||
18 | #include <plat/ste_dma40.h> | |
19 | ||
20 | #include "ste_dma40_ll.h" | |
21 | ||
22 | #define D40_NAME "dma40" | |
23 | ||
24 | #define D40_PHY_CHAN -1 | |
25 | ||
26 | /* For masking out/in 2 bit channel positions */ | |
27 | #define D40_CHAN_POS(chan) (2 * (chan / 2)) | |
28 | #define D40_CHAN_POS_MASK(chan) (0x3 << D40_CHAN_POS(chan)) | |
29 | ||
30 | /* Maximum iterations taken before giving up suspending a channel */ | |
31 | #define D40_SUSPEND_MAX_IT 500 | |
32 | ||
33 | #define D40_ALLOC_FREE (1 << 31) | |
34 | #define D40_ALLOC_PHY (1 << 30) | |
35 | #define D40_ALLOC_LOG_FREE 0 | |
36 | ||
8d318a50 LW |
37 | /* Hardware designer of the block */ |
38 | #define D40_PERIPHID2_DESIGNER 0x8 | |
39 | ||
40 | /** | |
41 | * enum 40_command - The different commands and/or statuses. | |
42 | * | |
43 | * @D40_DMA_STOP: DMA channel command STOP or status STOPPED, | |
44 | * @D40_DMA_RUN: The DMA channel is RUNNING of the command RUN. | |
45 | * @D40_DMA_SUSPEND_REQ: Request the DMA to SUSPEND as soon as possible. | |
46 | * @D40_DMA_SUSPENDED: The DMA channel is SUSPENDED. | |
47 | */ | |
48 | enum d40_command { | |
49 | D40_DMA_STOP = 0, | |
50 | D40_DMA_RUN = 1, | |
51 | D40_DMA_SUSPEND_REQ = 2, | |
52 | D40_DMA_SUSPENDED = 3 | |
53 | }; | |
54 | ||
55 | /** | |
56 | * struct d40_lli_pool - Structure for keeping LLIs in memory | |
57 | * | |
58 | * @base: Pointer to memory area when the pre_alloc_lli's are not large | |
59 | * enough, IE bigger than the most common case, 1 dst and 1 src. NULL if | |
60 | * pre_alloc_lli is used. | |
61 | * @size: The size in bytes of the memory at base or the size of pre_alloc_lli. | |
62 | * @pre_alloc_lli: Pre allocated area for the most common case of transfers, | |
63 | * one buffer to one buffer. | |
64 | */ | |
65 | struct d40_lli_pool { | |
66 | void *base; | |
67 | int size; | |
68 | /* Space for dst and src, plus an extra for padding */ | |
69 | u8 pre_alloc_lli[3 * sizeof(struct d40_phy_lli)]; | |
70 | }; | |
71 | ||
72 | /** | |
73 | * struct d40_desc - A descriptor is one DMA job. | |
74 | * | |
75 | * @lli_phy: LLI settings for physical channel. Both src and dst= | |
76 | * points into the lli_pool, to base if lli_len > 1 or to pre_alloc_lli if | |
77 | * lli_len equals one. | |
78 | * @lli_log: Same as above but for logical channels. | |
79 | * @lli_pool: The pool with two entries pre-allocated. | |
941b77a3 PF |
80 | * @lli_len: Number of llis of current descriptor. |
81 | * @lli_count: Number of transfered llis. | |
82 | * @lli_tx_len: Max number of LLIs per transfer, there can be | |
83 | * many transfer for one descriptor. | |
8d318a50 LW |
84 | * @txd: DMA engine struct. Used for among other things for communication |
85 | * during a transfer. | |
86 | * @node: List entry. | |
87 | * @dir: The transfer direction of this job. | |
88 | * @is_in_client_list: true if the client owns this descriptor. | |
89 | * | |
90 | * This descriptor is used for both logical and physical transfers. | |
91 | */ | |
92 | ||
93 | struct d40_desc { | |
94 | /* LLI physical */ | |
95 | struct d40_phy_lli_bidir lli_phy; | |
96 | /* LLI logical */ | |
97 | struct d40_log_lli_bidir lli_log; | |
98 | ||
99 | struct d40_lli_pool lli_pool; | |
941b77a3 PF |
100 | int lli_len; |
101 | int lli_count; | |
102 | u32 lli_tx_len; | |
8d318a50 LW |
103 | |
104 | struct dma_async_tx_descriptor txd; | |
105 | struct list_head node; | |
106 | ||
107 | enum dma_data_direction dir; | |
108 | bool is_in_client_list; | |
109 | }; | |
110 | ||
111 | /** | |
112 | * struct d40_lcla_pool - LCLA pool settings and data. | |
113 | * | |
114 | * @base: The virtual address of LCLA. | |
115 | * @phy: Physical base address of LCLA. | |
116 | * @base_size: size of lcla. | |
117 | * @lock: Lock to protect the content in this struct. | |
118 | * @alloc_map: Mapping between physical channel and LCLA entries. | |
119 | * @num_blocks: The number of entries of alloc_map. Equals to the | |
120 | * number of physical channels. | |
121 | */ | |
122 | struct d40_lcla_pool { | |
123 | void *base; | |
124 | dma_addr_t phy; | |
125 | resource_size_t base_size; | |
126 | spinlock_t lock; | |
127 | u32 *alloc_map; | |
128 | int num_blocks; | |
129 | }; | |
130 | ||
131 | /** | |
132 | * struct d40_phy_res - struct for handling eventlines mapped to physical | |
133 | * channels. | |
134 | * | |
135 | * @lock: A lock protection this entity. | |
136 | * @num: The physical channel number of this entity. | |
137 | * @allocated_src: Bit mapped to show which src event line's are mapped to | |
138 | * this physical channel. Can also be free or physically allocated. | |
139 | * @allocated_dst: Same as for src but is dst. | |
140 | * allocated_dst and allocated_src uses the D40_ALLOC* defines as well as | |
141 | * event line number. Both allocated_src and allocated_dst can not be | |
142 | * allocated to a physical channel, since the interrupt handler has then | |
143 | * no way of figure out which one the interrupt belongs to. | |
144 | */ | |
145 | struct d40_phy_res { | |
146 | spinlock_t lock; | |
147 | int num; | |
148 | u32 allocated_src; | |
149 | u32 allocated_dst; | |
150 | }; | |
151 | ||
152 | struct d40_base; | |
153 | ||
154 | /** | |
155 | * struct d40_chan - Struct that describes a channel. | |
156 | * | |
157 | * @lock: A spinlock to protect this struct. | |
158 | * @log_num: The logical number, if any of this channel. | |
159 | * @completed: Starts with 1, after first interrupt it is set to dma engine's | |
160 | * current cookie. | |
161 | * @pending_tx: The number of pending transfers. Used between interrupt handler | |
162 | * and tasklet. | |
163 | * @busy: Set to true when transfer is ongoing on this channel. | |
2a614340 JA |
164 | * @phy_chan: Pointer to physical channel which this instance runs on. If this |
165 | * point is NULL, then the channel is not allocated. | |
8d318a50 LW |
166 | * @chan: DMA engine handle. |
167 | * @tasklet: Tasklet that gets scheduled from interrupt context to complete a | |
168 | * transfer and call client callback. | |
169 | * @client: Cliented owned descriptor list. | |
170 | * @active: Active descriptor. | |
171 | * @queue: Queued jobs. | |
8d318a50 LW |
172 | * @dma_cfg: The client configuration of this dma channel. |
173 | * @base: Pointer to the device instance struct. | |
174 | * @src_def_cfg: Default cfg register setting for src. | |
175 | * @dst_def_cfg: Default cfg register setting for dst. | |
176 | * @log_def: Default logical channel settings. | |
177 | * @lcla: Space for one dst src pair for logical channel transfers. | |
178 | * @lcpa: Pointer to dst and src lcpa settings. | |
179 | * | |
180 | * This struct can either "be" a logical or a physical channel. | |
181 | */ | |
182 | struct d40_chan { | |
183 | spinlock_t lock; | |
184 | int log_num; | |
185 | /* ID of the most recent completed transfer */ | |
186 | int completed; | |
187 | int pending_tx; | |
188 | bool busy; | |
189 | struct d40_phy_res *phy_chan; | |
190 | struct dma_chan chan; | |
191 | struct tasklet_struct tasklet; | |
192 | struct list_head client; | |
193 | struct list_head active; | |
194 | struct list_head queue; | |
8d318a50 LW |
195 | struct stedma40_chan_cfg dma_cfg; |
196 | struct d40_base *base; | |
197 | /* Default register configurations */ | |
198 | u32 src_def_cfg; | |
199 | u32 dst_def_cfg; | |
200 | struct d40_def_lcsp log_def; | |
201 | struct d40_lcla_elem lcla; | |
202 | struct d40_log_lli_full *lcpa; | |
203 | }; | |
204 | ||
205 | /** | |
206 | * struct d40_base - The big global struct, one for each probe'd instance. | |
207 | * | |
208 | * @interrupt_lock: Lock used to make sure one interrupt is handle a time. | |
209 | * @execmd_lock: Lock for execute command usage since several channels share | |
210 | * the same physical register. | |
211 | * @dev: The device structure. | |
212 | * @virtbase: The virtual base address of the DMA's register. | |
213 | * @clk: Pointer to the DMA clock structure. | |
214 | * @phy_start: Physical memory start of the DMA registers. | |
215 | * @phy_size: Size of the DMA register map. | |
216 | * @irq: The IRQ number. | |
217 | * @num_phy_chans: The number of physical channels. Read from HW. This | |
218 | * is the number of available channels for this driver, not counting "Secure | |
219 | * mode" allocated physical channels. | |
220 | * @num_log_chans: The number of logical channels. Calculated from | |
221 | * num_phy_chans. | |
222 | * @dma_both: dma_device channels that can do both memcpy and slave transfers. | |
223 | * @dma_slave: dma_device channels that can do only do slave transfers. | |
224 | * @dma_memcpy: dma_device channels that can do only do memcpy transfers. | |
225 | * @phy_chans: Room for all possible physical channels in system. | |
226 | * @log_chans: Room for all possible logical channels in system. | |
227 | * @lookup_log_chans: Used to map interrupt number to logical channel. Points | |
228 | * to log_chans entries. | |
229 | * @lookup_phy_chans: Used to map interrupt number to physical channel. Points | |
230 | * to phy_chans entries. | |
231 | * @plat_data: Pointer to provided platform_data which is the driver | |
232 | * configuration. | |
233 | * @phy_res: Vector containing all physical channels. | |
234 | * @lcla_pool: lcla pool settings and data. | |
235 | * @lcpa_base: The virtual mapped address of LCPA. | |
236 | * @phy_lcpa: The physical address of the LCPA. | |
237 | * @lcpa_size: The size of the LCPA area. | |
c675b1b4 | 238 | * @desc_slab: cache for descriptors. |
8d318a50 LW |
239 | */ |
240 | struct d40_base { | |
241 | spinlock_t interrupt_lock; | |
242 | spinlock_t execmd_lock; | |
243 | struct device *dev; | |
244 | void __iomem *virtbase; | |
245 | struct clk *clk; | |
246 | phys_addr_t phy_start; | |
247 | resource_size_t phy_size; | |
248 | int irq; | |
249 | int num_phy_chans; | |
250 | int num_log_chans; | |
251 | struct dma_device dma_both; | |
252 | struct dma_device dma_slave; | |
253 | struct dma_device dma_memcpy; | |
254 | struct d40_chan *phy_chans; | |
255 | struct d40_chan *log_chans; | |
256 | struct d40_chan **lookup_log_chans; | |
257 | struct d40_chan **lookup_phy_chans; | |
258 | struct stedma40_platform_data *plat_data; | |
259 | /* Physical half channels */ | |
260 | struct d40_phy_res *phy_res; | |
261 | struct d40_lcla_pool lcla_pool; | |
262 | void *lcpa_base; | |
263 | dma_addr_t phy_lcpa; | |
264 | resource_size_t lcpa_size; | |
c675b1b4 | 265 | struct kmem_cache *desc_slab; |
8d318a50 LW |
266 | }; |
267 | ||
268 | /** | |
269 | * struct d40_interrupt_lookup - lookup table for interrupt handler | |
270 | * | |
271 | * @src: Interrupt mask register. | |
272 | * @clr: Interrupt clear register. | |
273 | * @is_error: true if this is an error interrupt. | |
274 | * @offset: start delta in the lookup_log_chans in d40_base. If equals to | |
275 | * D40_PHY_CHAN, the lookup_phy_chans shall be used instead. | |
276 | */ | |
277 | struct d40_interrupt_lookup { | |
278 | u32 src; | |
279 | u32 clr; | |
280 | bool is_error; | |
281 | int offset; | |
282 | }; | |
283 | ||
284 | /** | |
285 | * struct d40_reg_val - simple lookup struct | |
286 | * | |
287 | * @reg: The register. | |
288 | * @val: The value that belongs to the register in reg. | |
289 | */ | |
290 | struct d40_reg_val { | |
291 | unsigned int reg; | |
292 | unsigned int val; | |
293 | }; | |
294 | ||
295 | static int d40_pool_lli_alloc(struct d40_desc *d40d, | |
296 | int lli_len, bool is_log) | |
297 | { | |
298 | u32 align; | |
299 | void *base; | |
300 | ||
301 | if (is_log) | |
302 | align = sizeof(struct d40_log_lli); | |
303 | else | |
304 | align = sizeof(struct d40_phy_lli); | |
305 | ||
306 | if (lli_len == 1) { | |
307 | base = d40d->lli_pool.pre_alloc_lli; | |
308 | d40d->lli_pool.size = sizeof(d40d->lli_pool.pre_alloc_lli); | |
309 | d40d->lli_pool.base = NULL; | |
310 | } else { | |
311 | d40d->lli_pool.size = ALIGN(lli_len * 2 * align, align); | |
312 | ||
313 | base = kmalloc(d40d->lli_pool.size + align, GFP_NOWAIT); | |
314 | d40d->lli_pool.base = base; | |
315 | ||
316 | if (d40d->lli_pool.base == NULL) | |
317 | return -ENOMEM; | |
318 | } | |
319 | ||
320 | if (is_log) { | |
321 | d40d->lli_log.src = PTR_ALIGN((struct d40_log_lli *) base, | |
322 | align); | |
323 | d40d->lli_log.dst = PTR_ALIGN(d40d->lli_log.src + lli_len, | |
324 | align); | |
325 | } else { | |
326 | d40d->lli_phy.src = PTR_ALIGN((struct d40_phy_lli *)base, | |
327 | align); | |
328 | d40d->lli_phy.dst = PTR_ALIGN(d40d->lli_phy.src + lli_len, | |
329 | align); | |
330 | ||
331 | d40d->lli_phy.src_addr = virt_to_phys(d40d->lli_phy.src); | |
332 | d40d->lli_phy.dst_addr = virt_to_phys(d40d->lli_phy.dst); | |
333 | } | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | static void d40_pool_lli_free(struct d40_desc *d40d) | |
339 | { | |
340 | kfree(d40d->lli_pool.base); | |
341 | d40d->lli_pool.base = NULL; | |
342 | d40d->lli_pool.size = 0; | |
343 | d40d->lli_log.src = NULL; | |
344 | d40d->lli_log.dst = NULL; | |
345 | d40d->lli_phy.src = NULL; | |
346 | d40d->lli_phy.dst = NULL; | |
347 | d40d->lli_phy.src_addr = 0; | |
348 | d40d->lli_phy.dst_addr = 0; | |
349 | } | |
350 | ||
351 | static dma_cookie_t d40_assign_cookie(struct d40_chan *d40c, | |
352 | struct d40_desc *desc) | |
353 | { | |
354 | dma_cookie_t cookie = d40c->chan.cookie; | |
355 | ||
356 | if (++cookie < 0) | |
357 | cookie = 1; | |
358 | ||
359 | d40c->chan.cookie = cookie; | |
360 | desc->txd.cookie = cookie; | |
361 | ||
362 | return cookie; | |
363 | } | |
364 | ||
8d318a50 LW |
365 | static void d40_desc_remove(struct d40_desc *d40d) |
366 | { | |
367 | list_del(&d40d->node); | |
368 | } | |
369 | ||
370 | static struct d40_desc *d40_desc_get(struct d40_chan *d40c) | |
371 | { | |
8d318a50 LW |
372 | struct d40_desc *d; |
373 | struct d40_desc *_d; | |
374 | ||
375 | if (!list_empty(&d40c->client)) { | |
376 | list_for_each_entry_safe(d, _d, &d40c->client, node) | |
377 | if (async_tx_test_ack(&d->txd)) { | |
378 | d40_pool_lli_free(d); | |
379 | d40_desc_remove(d); | |
c675b1b4 | 380 | break; |
8d318a50 | 381 | } |
8d318a50 | 382 | } else { |
c675b1b4 JA |
383 | d = kmem_cache_alloc(d40c->base->desc_slab, GFP_NOWAIT); |
384 | if (d != NULL) { | |
385 | memset(d, 0, sizeof(struct d40_desc)); | |
386 | INIT_LIST_HEAD(&d->node); | |
387 | } | |
8d318a50 | 388 | } |
c675b1b4 | 389 | return d; |
8d318a50 LW |
390 | } |
391 | ||
392 | static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d) | |
393 | { | |
c675b1b4 | 394 | kmem_cache_free(d40c->base->desc_slab, d40d); |
8d318a50 LW |
395 | } |
396 | ||
397 | static void d40_desc_submit(struct d40_chan *d40c, struct d40_desc *desc) | |
398 | { | |
399 | list_add_tail(&desc->node, &d40c->active); | |
400 | } | |
401 | ||
402 | static struct d40_desc *d40_first_active_get(struct d40_chan *d40c) | |
403 | { | |
404 | struct d40_desc *d; | |
405 | ||
406 | if (list_empty(&d40c->active)) | |
407 | return NULL; | |
408 | ||
409 | d = list_first_entry(&d40c->active, | |
410 | struct d40_desc, | |
411 | node); | |
412 | return d; | |
413 | } | |
414 | ||
415 | static void d40_desc_queue(struct d40_chan *d40c, struct d40_desc *desc) | |
416 | { | |
417 | list_add_tail(&desc->node, &d40c->queue); | |
418 | } | |
419 | ||
420 | static struct d40_desc *d40_first_queued(struct d40_chan *d40c) | |
421 | { | |
422 | struct d40_desc *d; | |
423 | ||
424 | if (list_empty(&d40c->queue)) | |
425 | return NULL; | |
426 | ||
427 | d = list_first_entry(&d40c->queue, | |
428 | struct d40_desc, | |
429 | node); | |
430 | return d; | |
431 | } | |
432 | ||
433 | /* Support functions for logical channels */ | |
434 | ||
435 | static int d40_lcla_id_get(struct d40_chan *d40c, | |
436 | struct d40_lcla_pool *pool) | |
437 | { | |
438 | int src_id = 0; | |
439 | int dst_id = 0; | |
440 | struct d40_log_lli *lcla_lidx_base = | |
441 | pool->base + d40c->phy_chan->num * 1024; | |
442 | int i; | |
443 | int lli_per_log = d40c->base->plat_data->llis_per_log; | |
2292b880 | 444 | unsigned long flags; |
8d318a50 LW |
445 | |
446 | if (d40c->lcla.src_id >= 0 && d40c->lcla.dst_id >= 0) | |
447 | return 0; | |
448 | ||
449 | if (pool->num_blocks > 32) | |
450 | return -EINVAL; | |
451 | ||
2292b880 | 452 | spin_lock_irqsave(&pool->lock, flags); |
8d318a50 LW |
453 | |
454 | for (i = 0; i < pool->num_blocks; i++) { | |
455 | if (!(pool->alloc_map[d40c->phy_chan->num] & (0x1 << i))) { | |
456 | pool->alloc_map[d40c->phy_chan->num] |= (0x1 << i); | |
457 | break; | |
458 | } | |
459 | } | |
460 | src_id = i; | |
461 | if (src_id >= pool->num_blocks) | |
462 | goto err; | |
463 | ||
464 | for (; i < pool->num_blocks; i++) { | |
465 | if (!(pool->alloc_map[d40c->phy_chan->num] & (0x1 << i))) { | |
466 | pool->alloc_map[d40c->phy_chan->num] |= (0x1 << i); | |
467 | break; | |
468 | } | |
469 | } | |
470 | ||
471 | dst_id = i; | |
472 | if (dst_id == src_id) | |
473 | goto err; | |
474 | ||
475 | d40c->lcla.src_id = src_id; | |
476 | d40c->lcla.dst_id = dst_id; | |
477 | d40c->lcla.dst = lcla_lidx_base + dst_id * lli_per_log + 1; | |
478 | d40c->lcla.src = lcla_lidx_base + src_id * lli_per_log + 1; | |
479 | ||
480 | ||
2292b880 | 481 | spin_unlock_irqrestore(&pool->lock, flags); |
8d318a50 LW |
482 | return 0; |
483 | err: | |
2292b880 | 484 | spin_unlock_irqrestore(&pool->lock, flags); |
8d318a50 LW |
485 | return -EINVAL; |
486 | } | |
487 | ||
488 | static void d40_lcla_id_put(struct d40_chan *d40c, | |
489 | struct d40_lcla_pool *pool, | |
490 | int id) | |
491 | { | |
2292b880 | 492 | unsigned long flags; |
8d318a50 LW |
493 | if (id < 0) |
494 | return; | |
495 | ||
496 | d40c->lcla.src_id = -1; | |
497 | d40c->lcla.dst_id = -1; | |
498 | ||
2292b880 | 499 | spin_lock_irqsave(&pool->lock, flags); |
8d318a50 | 500 | pool->alloc_map[d40c->phy_chan->num] &= (~(0x1 << id)); |
2292b880 | 501 | spin_unlock_irqrestore(&pool->lock, flags); |
8d318a50 LW |
502 | } |
503 | ||
504 | static int d40_channel_execute_command(struct d40_chan *d40c, | |
505 | enum d40_command command) | |
506 | { | |
507 | int status, i; | |
508 | void __iomem *active_reg; | |
509 | int ret = 0; | |
510 | unsigned long flags; | |
511 | ||
512 | spin_lock_irqsave(&d40c->base->execmd_lock, flags); | |
513 | ||
514 | if (d40c->phy_chan->num % 2 == 0) | |
515 | active_reg = d40c->base->virtbase + D40_DREG_ACTIVE; | |
516 | else | |
517 | active_reg = d40c->base->virtbase + D40_DREG_ACTIVO; | |
518 | ||
519 | if (command == D40_DMA_SUSPEND_REQ) { | |
520 | status = (readl(active_reg) & | |
521 | D40_CHAN_POS_MASK(d40c->phy_chan->num)) >> | |
522 | D40_CHAN_POS(d40c->phy_chan->num); | |
523 | ||
524 | if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP) | |
525 | goto done; | |
526 | } | |
527 | ||
528 | writel(command << D40_CHAN_POS(d40c->phy_chan->num), active_reg); | |
529 | ||
530 | if (command == D40_DMA_SUSPEND_REQ) { | |
531 | ||
532 | for (i = 0 ; i < D40_SUSPEND_MAX_IT; i++) { | |
533 | status = (readl(active_reg) & | |
534 | D40_CHAN_POS_MASK(d40c->phy_chan->num)) >> | |
535 | D40_CHAN_POS(d40c->phy_chan->num); | |
536 | ||
537 | cpu_relax(); | |
538 | /* | |
539 | * Reduce the number of bus accesses while | |
540 | * waiting for the DMA to suspend. | |
541 | */ | |
542 | udelay(3); | |
543 | ||
544 | if (status == D40_DMA_STOP || | |
545 | status == D40_DMA_SUSPENDED) | |
546 | break; | |
547 | } | |
548 | ||
549 | if (i == D40_SUSPEND_MAX_IT) { | |
550 | dev_err(&d40c->chan.dev->device, | |
551 | "[%s]: unable to suspend the chl %d (log: %d) status %x\n", | |
552 | __func__, d40c->phy_chan->num, d40c->log_num, | |
553 | status); | |
554 | dump_stack(); | |
555 | ret = -EBUSY; | |
556 | } | |
557 | ||
558 | } | |
559 | done: | |
560 | spin_unlock_irqrestore(&d40c->base->execmd_lock, flags); | |
561 | return ret; | |
562 | } | |
563 | ||
564 | static void d40_term_all(struct d40_chan *d40c) | |
565 | { | |
566 | struct d40_desc *d40d; | |
8d318a50 LW |
567 | |
568 | /* Release active descriptors */ | |
569 | while ((d40d = d40_first_active_get(d40c))) { | |
570 | d40_desc_remove(d40d); | |
571 | ||
572 | /* Return desc to free-list */ | |
573 | d40_desc_free(d40c, d40d); | |
574 | } | |
575 | ||
576 | /* Release queued descriptors waiting for transfer */ | |
577 | while ((d40d = d40_first_queued(d40c))) { | |
578 | d40_desc_remove(d40d); | |
579 | ||
580 | /* Return desc to free-list */ | |
581 | d40_desc_free(d40c, d40d); | |
582 | } | |
583 | ||
8d318a50 LW |
584 | d40_lcla_id_put(d40c, &d40c->base->lcla_pool, |
585 | d40c->lcla.src_id); | |
586 | d40_lcla_id_put(d40c, &d40c->base->lcla_pool, | |
587 | d40c->lcla.dst_id); | |
588 | ||
589 | d40c->pending_tx = 0; | |
590 | d40c->busy = false; | |
591 | } | |
592 | ||
593 | static void d40_config_set_event(struct d40_chan *d40c, bool do_enable) | |
594 | { | |
595 | u32 val; | |
596 | unsigned long flags; | |
597 | ||
0c32269d | 598 | /* Notice, that disable requires the physical channel to be stopped */ |
8d318a50 LW |
599 | if (do_enable) |
600 | val = D40_ACTIVATE_EVENTLINE; | |
601 | else | |
602 | val = D40_DEACTIVATE_EVENTLINE; | |
603 | ||
604 | spin_lock_irqsave(&d40c->phy_chan->lock, flags); | |
605 | ||
606 | /* Enable event line connected to device (or memcpy) */ | |
607 | if ((d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) || | |
608 | (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH)) { | |
609 | u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type); | |
610 | ||
611 | writel((val << D40_EVENTLINE_POS(event)) | | |
612 | ~D40_EVENTLINE_MASK(event), | |
613 | d40c->base->virtbase + D40_DREG_PCBASE + | |
614 | d40c->phy_chan->num * D40_DREG_PCDELTA + | |
615 | D40_CHAN_REG_SSLNK); | |
616 | } | |
617 | if (d40c->dma_cfg.dir != STEDMA40_PERIPH_TO_MEM) { | |
618 | u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type); | |
619 | ||
620 | writel((val << D40_EVENTLINE_POS(event)) | | |
621 | ~D40_EVENTLINE_MASK(event), | |
622 | d40c->base->virtbase + D40_DREG_PCBASE + | |
623 | d40c->phy_chan->num * D40_DREG_PCDELTA + | |
624 | D40_CHAN_REG_SDLNK); | |
625 | } | |
626 | ||
627 | spin_unlock_irqrestore(&d40c->phy_chan->lock, flags); | |
628 | } | |
629 | ||
a5ebca47 | 630 | static u32 d40_chan_has_events(struct d40_chan *d40c) |
8d318a50 LW |
631 | { |
632 | u32 val = 0; | |
633 | ||
634 | /* If SSLNK or SDLNK is zero all events are disabled */ | |
635 | if ((d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) || | |
636 | (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH)) | |
637 | val = readl(d40c->base->virtbase + D40_DREG_PCBASE + | |
638 | d40c->phy_chan->num * D40_DREG_PCDELTA + | |
639 | D40_CHAN_REG_SSLNK); | |
640 | ||
641 | if (d40c->dma_cfg.dir != STEDMA40_PERIPH_TO_MEM) | |
642 | val = readl(d40c->base->virtbase + D40_DREG_PCBASE + | |
643 | d40c->phy_chan->num * D40_DREG_PCDELTA + | |
644 | D40_CHAN_REG_SDLNK); | |
a5ebca47 | 645 | return val; |
8d318a50 LW |
646 | } |
647 | ||
648 | static void d40_config_enable_lidx(struct d40_chan *d40c) | |
649 | { | |
650 | /* Set LIDX for lcla */ | |
651 | writel((d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS) & | |
652 | D40_SREG_ELEM_LOG_LIDX_MASK, | |
653 | d40c->base->virtbase + D40_DREG_PCBASE + | |
654 | d40c->phy_chan->num * D40_DREG_PCDELTA + D40_CHAN_REG_SDELT); | |
655 | ||
656 | writel((d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS) & | |
657 | D40_SREG_ELEM_LOG_LIDX_MASK, | |
658 | d40c->base->virtbase + D40_DREG_PCBASE + | |
659 | d40c->phy_chan->num * D40_DREG_PCDELTA + D40_CHAN_REG_SSELT); | |
660 | } | |
661 | ||
662 | static int d40_config_write(struct d40_chan *d40c) | |
663 | { | |
664 | u32 addr_base; | |
665 | u32 var; | |
666 | int res; | |
667 | ||
668 | res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ); | |
669 | if (res) | |
670 | return res; | |
671 | ||
672 | /* Odd addresses are even addresses + 4 */ | |
673 | addr_base = (d40c->phy_chan->num % 2) * 4; | |
674 | /* Setup channel mode to logical or physical */ | |
675 | var = ((u32)(d40c->log_num != D40_PHY_CHAN) + 1) << | |
676 | D40_CHAN_POS(d40c->phy_chan->num); | |
677 | writel(var, d40c->base->virtbase + D40_DREG_PRMSE + addr_base); | |
678 | ||
679 | /* Setup operational mode option register */ | |
680 | var = ((d40c->dma_cfg.channel_type >> STEDMA40_INFO_CH_MODE_OPT_POS) & | |
681 | 0x3) << D40_CHAN_POS(d40c->phy_chan->num); | |
682 | ||
683 | writel(var, d40c->base->virtbase + D40_DREG_PRMOE + addr_base); | |
684 | ||
685 | if (d40c->log_num != D40_PHY_CHAN) { | |
686 | /* Set default config for CFG reg */ | |
687 | writel(d40c->src_def_cfg, | |
688 | d40c->base->virtbase + D40_DREG_PCBASE + | |
689 | d40c->phy_chan->num * D40_DREG_PCDELTA + | |
690 | D40_CHAN_REG_SSCFG); | |
691 | writel(d40c->dst_def_cfg, | |
692 | d40c->base->virtbase + D40_DREG_PCBASE + | |
693 | d40c->phy_chan->num * D40_DREG_PCDELTA + | |
694 | D40_CHAN_REG_SDCFG); | |
695 | ||
696 | d40_config_enable_lidx(d40c); | |
697 | } | |
698 | return res; | |
699 | } | |
700 | ||
701 | static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d) | |
702 | { | |
703 | ||
704 | if (d40d->lli_phy.dst && d40d->lli_phy.src) { | |
705 | d40_phy_lli_write(d40c->base->virtbase, | |
706 | d40c->phy_chan->num, | |
707 | d40d->lli_phy.dst, | |
708 | d40d->lli_phy.src); | |
8d318a50 | 709 | } else if (d40d->lli_log.dst && d40d->lli_log.src) { |
8d318a50 LW |
710 | struct d40_log_lli *src = d40d->lli_log.src; |
711 | struct d40_log_lli *dst = d40d->lli_log.dst; | |
712 | ||
941b77a3 PF |
713 | src += d40d->lli_count; |
714 | dst += d40d->lli_count; | |
8d318a50 LW |
715 | d40_log_lli_write(d40c->lcpa, d40c->lcla.src, |
716 | d40c->lcla.dst, | |
717 | dst, src, | |
718 | d40c->base->plat_data->llis_per_log); | |
719 | } | |
941b77a3 | 720 | d40d->lli_count += d40d->lli_tx_len; |
8d318a50 LW |
721 | } |
722 | ||
723 | static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx) | |
724 | { | |
725 | struct d40_chan *d40c = container_of(tx->chan, | |
726 | struct d40_chan, | |
727 | chan); | |
728 | struct d40_desc *d40d = container_of(tx, struct d40_desc, txd); | |
729 | unsigned long flags; | |
730 | ||
731 | spin_lock_irqsave(&d40c->lock, flags); | |
732 | ||
733 | tx->cookie = d40_assign_cookie(d40c, d40d); | |
734 | ||
735 | d40_desc_queue(d40c, d40d); | |
736 | ||
737 | spin_unlock_irqrestore(&d40c->lock, flags); | |
738 | ||
739 | return tx->cookie; | |
740 | } | |
741 | ||
742 | static int d40_start(struct d40_chan *d40c) | |
743 | { | |
0c32269d | 744 | if (d40c->log_num != D40_PHY_CHAN) |
8d318a50 | 745 | d40_config_set_event(d40c, true); |
8d318a50 | 746 | |
0c32269d | 747 | return d40_channel_execute_command(d40c, D40_DMA_RUN); |
8d318a50 LW |
748 | } |
749 | ||
750 | static struct d40_desc *d40_queue_start(struct d40_chan *d40c) | |
751 | { | |
752 | struct d40_desc *d40d; | |
753 | int err; | |
754 | ||
755 | /* Start queued jobs, if any */ | |
756 | d40d = d40_first_queued(d40c); | |
757 | ||
758 | if (d40d != NULL) { | |
759 | d40c->busy = true; | |
760 | ||
761 | /* Remove from queue */ | |
762 | d40_desc_remove(d40d); | |
763 | ||
764 | /* Add to active queue */ | |
765 | d40_desc_submit(d40c, d40d); | |
766 | ||
767 | /* Initiate DMA job */ | |
768 | d40_desc_load(d40c, d40d); | |
769 | ||
770 | /* Start dma job */ | |
771 | err = d40_start(d40c); | |
772 | ||
773 | if (err) | |
774 | return NULL; | |
775 | } | |
776 | ||
777 | return d40d; | |
778 | } | |
779 | ||
780 | /* called from interrupt context */ | |
781 | static void dma_tc_handle(struct d40_chan *d40c) | |
782 | { | |
783 | struct d40_desc *d40d; | |
784 | ||
785 | if (!d40c->phy_chan) | |
786 | return; | |
787 | ||
788 | /* Get first active entry from list */ | |
789 | d40d = d40_first_active_get(d40c); | |
790 | ||
791 | if (d40d == NULL) | |
792 | return; | |
793 | ||
941b77a3 | 794 | if (d40d->lli_count < d40d->lli_len) { |
8d318a50 LW |
795 | |
796 | d40_desc_load(d40c, d40d); | |
797 | /* Start dma job */ | |
798 | (void) d40_start(d40c); | |
799 | return; | |
800 | } | |
801 | ||
802 | if (d40_queue_start(d40c) == NULL) | |
803 | d40c->busy = false; | |
804 | ||
805 | d40c->pending_tx++; | |
806 | tasklet_schedule(&d40c->tasklet); | |
807 | ||
808 | } | |
809 | ||
810 | static void dma_tasklet(unsigned long data) | |
811 | { | |
812 | struct d40_chan *d40c = (struct d40_chan *) data; | |
813 | struct d40_desc *d40d_fin; | |
814 | unsigned long flags; | |
815 | dma_async_tx_callback callback; | |
816 | void *callback_param; | |
817 | ||
818 | spin_lock_irqsave(&d40c->lock, flags); | |
819 | ||
820 | /* Get first active entry from list */ | |
821 | d40d_fin = d40_first_active_get(d40c); | |
822 | ||
823 | if (d40d_fin == NULL) | |
824 | goto err; | |
825 | ||
826 | d40c->completed = d40d_fin->txd.cookie; | |
827 | ||
828 | /* | |
829 | * If terminating a channel pending_tx is set to zero. | |
830 | * This prevents any finished active jobs to return to the client. | |
831 | */ | |
832 | if (d40c->pending_tx == 0) { | |
833 | spin_unlock_irqrestore(&d40c->lock, flags); | |
834 | return; | |
835 | } | |
836 | ||
837 | /* Callback to client */ | |
838 | callback = d40d_fin->txd.callback; | |
839 | callback_param = d40d_fin->txd.callback_param; | |
840 | ||
841 | if (async_tx_test_ack(&d40d_fin->txd)) { | |
842 | d40_pool_lli_free(d40d_fin); | |
843 | d40_desc_remove(d40d_fin); | |
844 | /* Return desc to free-list */ | |
845 | d40_desc_free(d40c, d40d_fin); | |
846 | } else { | |
8d318a50 LW |
847 | if (!d40d_fin->is_in_client_list) { |
848 | d40_desc_remove(d40d_fin); | |
849 | list_add_tail(&d40d_fin->node, &d40c->client); | |
850 | d40d_fin->is_in_client_list = true; | |
851 | } | |
852 | } | |
853 | ||
854 | d40c->pending_tx--; | |
855 | ||
856 | if (d40c->pending_tx) | |
857 | tasklet_schedule(&d40c->tasklet); | |
858 | ||
859 | spin_unlock_irqrestore(&d40c->lock, flags); | |
860 | ||
861 | if (callback) | |
862 | callback(callback_param); | |
863 | ||
864 | return; | |
865 | ||
866 | err: | |
867 | /* Rescue manouver if receiving double interrupts */ | |
868 | if (d40c->pending_tx > 0) | |
869 | d40c->pending_tx--; | |
870 | spin_unlock_irqrestore(&d40c->lock, flags); | |
871 | } | |
872 | ||
873 | static irqreturn_t d40_handle_interrupt(int irq, void *data) | |
874 | { | |
875 | static const struct d40_interrupt_lookup il[] = { | |
876 | {D40_DREG_LCTIS0, D40_DREG_LCICR0, false, 0}, | |
877 | {D40_DREG_LCTIS1, D40_DREG_LCICR1, false, 32}, | |
878 | {D40_DREG_LCTIS2, D40_DREG_LCICR2, false, 64}, | |
879 | {D40_DREG_LCTIS3, D40_DREG_LCICR3, false, 96}, | |
880 | {D40_DREG_LCEIS0, D40_DREG_LCICR0, true, 0}, | |
881 | {D40_DREG_LCEIS1, D40_DREG_LCICR1, true, 32}, | |
882 | {D40_DREG_LCEIS2, D40_DREG_LCICR2, true, 64}, | |
883 | {D40_DREG_LCEIS3, D40_DREG_LCICR3, true, 96}, | |
884 | {D40_DREG_PCTIS, D40_DREG_PCICR, false, D40_PHY_CHAN}, | |
885 | {D40_DREG_PCEIS, D40_DREG_PCICR, true, D40_PHY_CHAN}, | |
886 | }; | |
887 | ||
888 | int i; | |
889 | u32 regs[ARRAY_SIZE(il)]; | |
890 | u32 tmp; | |
891 | u32 idx; | |
892 | u32 row; | |
893 | long chan = -1; | |
894 | struct d40_chan *d40c; | |
895 | unsigned long flags; | |
896 | struct d40_base *base = data; | |
897 | ||
898 | spin_lock_irqsave(&base->interrupt_lock, flags); | |
899 | ||
900 | /* Read interrupt status of both logical and physical channels */ | |
901 | for (i = 0; i < ARRAY_SIZE(il); i++) | |
902 | regs[i] = readl(base->virtbase + il[i].src); | |
903 | ||
904 | for (;;) { | |
905 | ||
906 | chan = find_next_bit((unsigned long *)regs, | |
907 | BITS_PER_LONG * ARRAY_SIZE(il), chan + 1); | |
908 | ||
909 | /* No more set bits found? */ | |
910 | if (chan == BITS_PER_LONG * ARRAY_SIZE(il)) | |
911 | break; | |
912 | ||
913 | row = chan / BITS_PER_LONG; | |
914 | idx = chan & (BITS_PER_LONG - 1); | |
915 | ||
916 | /* ACK interrupt */ | |
917 | tmp = readl(base->virtbase + il[row].clr); | |
918 | tmp |= 1 << idx; | |
919 | writel(tmp, base->virtbase + il[row].clr); | |
920 | ||
921 | if (il[row].offset == D40_PHY_CHAN) | |
922 | d40c = base->lookup_phy_chans[idx]; | |
923 | else | |
924 | d40c = base->lookup_log_chans[il[row].offset + idx]; | |
925 | spin_lock(&d40c->lock); | |
926 | ||
927 | if (!il[row].is_error) | |
928 | dma_tc_handle(d40c); | |
929 | else | |
930 | dev_err(base->dev, "[%s] IRQ chan: %ld offset %d idx %d\n", | |
931 | __func__, chan, il[row].offset, idx); | |
932 | ||
933 | spin_unlock(&d40c->lock); | |
934 | } | |
935 | ||
936 | spin_unlock_irqrestore(&base->interrupt_lock, flags); | |
937 | ||
938 | return IRQ_HANDLED; | |
939 | } | |
940 | ||
941 | ||
942 | static int d40_validate_conf(struct d40_chan *d40c, | |
943 | struct stedma40_chan_cfg *conf) | |
944 | { | |
945 | int res = 0; | |
946 | u32 dst_event_group = D40_TYPE_TO_GROUP(conf->dst_dev_type); | |
947 | u32 src_event_group = D40_TYPE_TO_GROUP(conf->src_dev_type); | |
948 | bool is_log = (conf->channel_type & STEDMA40_CHANNEL_IN_OPER_MODE) | |
949 | == STEDMA40_CHANNEL_IN_LOG_MODE; | |
950 | ||
951 | if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH && | |
952 | dst_event_group == STEDMA40_DEV_DST_MEMORY) { | |
953 | dev_err(&d40c->chan.dev->device, "[%s] Invalid dst\n", | |
954 | __func__); | |
955 | res = -EINVAL; | |
956 | } | |
957 | ||
958 | if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM && | |
959 | src_event_group == STEDMA40_DEV_SRC_MEMORY) { | |
960 | dev_err(&d40c->chan.dev->device, "[%s] Invalid src\n", | |
961 | __func__); | |
962 | res = -EINVAL; | |
963 | } | |
964 | ||
965 | if (src_event_group == STEDMA40_DEV_SRC_MEMORY && | |
966 | dst_event_group == STEDMA40_DEV_DST_MEMORY && is_log) { | |
967 | dev_err(&d40c->chan.dev->device, | |
968 | "[%s] No event line\n", __func__); | |
969 | res = -EINVAL; | |
970 | } | |
971 | ||
972 | if (conf->dir == STEDMA40_PERIPH_TO_PERIPH && | |
973 | (src_event_group != dst_event_group)) { | |
974 | dev_err(&d40c->chan.dev->device, | |
975 | "[%s] Invalid event group\n", __func__); | |
976 | res = -EINVAL; | |
977 | } | |
978 | ||
979 | if (conf->dir == STEDMA40_PERIPH_TO_PERIPH) { | |
980 | /* | |
981 | * DMAC HW supports it. Will be added to this driver, | |
982 | * in case any dma client requires it. | |
983 | */ | |
984 | dev_err(&d40c->chan.dev->device, | |
985 | "[%s] periph to periph not supported\n", | |
986 | __func__); | |
987 | res = -EINVAL; | |
988 | } | |
989 | ||
990 | return res; | |
991 | } | |
992 | ||
993 | static bool d40_alloc_mask_set(struct d40_phy_res *phy, bool is_src, | |
4aed79b2 | 994 | int log_event_line, bool is_log) |
8d318a50 LW |
995 | { |
996 | unsigned long flags; | |
997 | spin_lock_irqsave(&phy->lock, flags); | |
4aed79b2 | 998 | if (!is_log) { |
8d318a50 LW |
999 | /* Physical interrupts are masked per physical full channel */ |
1000 | if (phy->allocated_src == D40_ALLOC_FREE && | |
1001 | phy->allocated_dst == D40_ALLOC_FREE) { | |
1002 | phy->allocated_dst = D40_ALLOC_PHY; | |
1003 | phy->allocated_src = D40_ALLOC_PHY; | |
1004 | goto found; | |
1005 | } else | |
1006 | goto not_found; | |
1007 | } | |
1008 | ||
1009 | /* Logical channel */ | |
1010 | if (is_src) { | |
1011 | if (phy->allocated_src == D40_ALLOC_PHY) | |
1012 | goto not_found; | |
1013 | ||
1014 | if (phy->allocated_src == D40_ALLOC_FREE) | |
1015 | phy->allocated_src = D40_ALLOC_LOG_FREE; | |
1016 | ||
1017 | if (!(phy->allocated_src & (1 << log_event_line))) { | |
1018 | phy->allocated_src |= 1 << log_event_line; | |
1019 | goto found; | |
1020 | } else | |
1021 | goto not_found; | |
1022 | } else { | |
1023 | if (phy->allocated_dst == D40_ALLOC_PHY) | |
1024 | goto not_found; | |
1025 | ||
1026 | if (phy->allocated_dst == D40_ALLOC_FREE) | |
1027 | phy->allocated_dst = D40_ALLOC_LOG_FREE; | |
1028 | ||
1029 | if (!(phy->allocated_dst & (1 << log_event_line))) { | |
1030 | phy->allocated_dst |= 1 << log_event_line; | |
1031 | goto found; | |
1032 | } else | |
1033 | goto not_found; | |
1034 | } | |
1035 | ||
1036 | not_found: | |
1037 | spin_unlock_irqrestore(&phy->lock, flags); | |
1038 | return false; | |
1039 | found: | |
1040 | spin_unlock_irqrestore(&phy->lock, flags); | |
1041 | return true; | |
1042 | } | |
1043 | ||
1044 | static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src, | |
1045 | int log_event_line) | |
1046 | { | |
1047 | unsigned long flags; | |
1048 | bool is_free = false; | |
1049 | ||
1050 | spin_lock_irqsave(&phy->lock, flags); | |
1051 | if (!log_event_line) { | |
1052 | /* Physical interrupts are masked per physical full channel */ | |
1053 | phy->allocated_dst = D40_ALLOC_FREE; | |
1054 | phy->allocated_src = D40_ALLOC_FREE; | |
1055 | is_free = true; | |
1056 | goto out; | |
1057 | } | |
1058 | ||
1059 | /* Logical channel */ | |
1060 | if (is_src) { | |
1061 | phy->allocated_src &= ~(1 << log_event_line); | |
1062 | if (phy->allocated_src == D40_ALLOC_LOG_FREE) | |
1063 | phy->allocated_src = D40_ALLOC_FREE; | |
1064 | } else { | |
1065 | phy->allocated_dst &= ~(1 << log_event_line); | |
1066 | if (phy->allocated_dst == D40_ALLOC_LOG_FREE) | |
1067 | phy->allocated_dst = D40_ALLOC_FREE; | |
1068 | } | |
1069 | ||
1070 | is_free = ((phy->allocated_src | phy->allocated_dst) == | |
1071 | D40_ALLOC_FREE); | |
1072 | ||
1073 | out: | |
1074 | spin_unlock_irqrestore(&phy->lock, flags); | |
1075 | ||
1076 | return is_free; | |
1077 | } | |
1078 | ||
1079 | static int d40_allocate_channel(struct d40_chan *d40c) | |
1080 | { | |
1081 | int dev_type; | |
1082 | int event_group; | |
1083 | int event_line; | |
1084 | struct d40_phy_res *phys; | |
1085 | int i; | |
1086 | int j; | |
1087 | int log_num; | |
1088 | bool is_src; | |
1089 | bool is_log = (d40c->dma_cfg.channel_type & STEDMA40_CHANNEL_IN_OPER_MODE) | |
1090 | == STEDMA40_CHANNEL_IN_LOG_MODE; | |
1091 | ||
1092 | ||
1093 | phys = d40c->base->phy_res; | |
1094 | ||
1095 | if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) { | |
1096 | dev_type = d40c->dma_cfg.src_dev_type; | |
1097 | log_num = 2 * dev_type; | |
1098 | is_src = true; | |
1099 | } else if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH || | |
1100 | d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) { | |
1101 | /* dst event lines are used for logical memcpy */ | |
1102 | dev_type = d40c->dma_cfg.dst_dev_type; | |
1103 | log_num = 2 * dev_type + 1; | |
1104 | is_src = false; | |
1105 | } else | |
1106 | return -EINVAL; | |
1107 | ||
1108 | event_group = D40_TYPE_TO_GROUP(dev_type); | |
1109 | event_line = D40_TYPE_TO_EVENT(dev_type); | |
1110 | ||
1111 | if (!is_log) { | |
1112 | if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) { | |
1113 | /* Find physical half channel */ | |
1114 | for (i = 0; i < d40c->base->num_phy_chans; i++) { | |
1115 | ||
4aed79b2 MM |
1116 | if (d40_alloc_mask_set(&phys[i], is_src, |
1117 | 0, is_log)) | |
8d318a50 LW |
1118 | goto found_phy; |
1119 | } | |
1120 | } else | |
1121 | for (j = 0; j < d40c->base->num_phy_chans; j += 8) { | |
1122 | int phy_num = j + event_group * 2; | |
1123 | for (i = phy_num; i < phy_num + 2; i++) { | |
4aed79b2 MM |
1124 | if (d40_alloc_mask_set(&phys[i], is_src, |
1125 | 0, is_log)) | |
8d318a50 LW |
1126 | goto found_phy; |
1127 | } | |
1128 | } | |
1129 | return -EINVAL; | |
1130 | found_phy: | |
1131 | d40c->phy_chan = &phys[i]; | |
1132 | d40c->log_num = D40_PHY_CHAN; | |
1133 | goto out; | |
1134 | } | |
1135 | if (dev_type == -1) | |
1136 | return -EINVAL; | |
1137 | ||
1138 | /* Find logical channel */ | |
1139 | for (j = 0; j < d40c->base->num_phy_chans; j += 8) { | |
1140 | int phy_num = j + event_group * 2; | |
1141 | /* | |
1142 | * Spread logical channels across all available physical rather | |
1143 | * than pack every logical channel at the first available phy | |
1144 | * channels. | |
1145 | */ | |
1146 | if (is_src) { | |
1147 | for (i = phy_num; i < phy_num + 2; i++) { | |
1148 | if (d40_alloc_mask_set(&phys[i], is_src, | |
4aed79b2 | 1149 | event_line, is_log)) |
8d318a50 LW |
1150 | goto found_log; |
1151 | } | |
1152 | } else { | |
1153 | for (i = phy_num + 1; i >= phy_num; i--) { | |
1154 | if (d40_alloc_mask_set(&phys[i], is_src, | |
4aed79b2 | 1155 | event_line, is_log)) |
8d318a50 LW |
1156 | goto found_log; |
1157 | } | |
1158 | } | |
1159 | } | |
1160 | return -EINVAL; | |
1161 | ||
1162 | found_log: | |
1163 | d40c->phy_chan = &phys[i]; | |
1164 | d40c->log_num = log_num; | |
1165 | out: | |
1166 | ||
1167 | if (is_log) | |
1168 | d40c->base->lookup_log_chans[d40c->log_num] = d40c; | |
1169 | else | |
1170 | d40c->base->lookup_phy_chans[d40c->phy_chan->num] = d40c; | |
1171 | ||
1172 | return 0; | |
1173 | ||
1174 | } | |
1175 | ||
8d318a50 LW |
1176 | static int d40_config_memcpy(struct d40_chan *d40c) |
1177 | { | |
1178 | dma_cap_mask_t cap = d40c->chan.device->cap_mask; | |
1179 | ||
1180 | if (dma_has_cap(DMA_MEMCPY, cap) && !dma_has_cap(DMA_SLAVE, cap)) { | |
1181 | d40c->dma_cfg = *d40c->base->plat_data->memcpy_conf_log; | |
1182 | d40c->dma_cfg.src_dev_type = STEDMA40_DEV_SRC_MEMORY; | |
1183 | d40c->dma_cfg.dst_dev_type = d40c->base->plat_data-> | |
1184 | memcpy[d40c->chan.chan_id]; | |
1185 | ||
1186 | } else if (dma_has_cap(DMA_MEMCPY, cap) && | |
1187 | dma_has_cap(DMA_SLAVE, cap)) { | |
1188 | d40c->dma_cfg = *d40c->base->plat_data->memcpy_conf_phy; | |
1189 | } else { | |
1190 | dev_err(&d40c->chan.dev->device, "[%s] No memcpy\n", | |
1191 | __func__); | |
1192 | return -EINVAL; | |
1193 | } | |
1194 | ||
1195 | return 0; | |
1196 | } | |
1197 | ||
1198 | ||
1199 | static int d40_free_dma(struct d40_chan *d40c) | |
1200 | { | |
1201 | ||
1202 | int res = 0; | |
1203 | u32 event, dir; | |
1204 | struct d40_phy_res *phy = d40c->phy_chan; | |
1205 | bool is_src; | |
a8be8627 PF |
1206 | struct d40_desc *d; |
1207 | struct d40_desc *_d; | |
1208 | ||
8d318a50 LW |
1209 | |
1210 | /* Terminate all queued and active transfers */ | |
1211 | d40_term_all(d40c); | |
1212 | ||
a8be8627 PF |
1213 | /* Release client owned descriptors */ |
1214 | if (!list_empty(&d40c->client)) | |
1215 | list_for_each_entry_safe(d, _d, &d40c->client, node) { | |
1216 | d40_pool_lli_free(d); | |
1217 | d40_desc_remove(d); | |
1218 | /* Return desc to free-list */ | |
1219 | d40_desc_free(d40c, d); | |
1220 | } | |
1221 | ||
8d318a50 LW |
1222 | if (phy == NULL) { |
1223 | dev_err(&d40c->chan.dev->device, "[%s] phy == null\n", | |
1224 | __func__); | |
1225 | return -EINVAL; | |
1226 | } | |
1227 | ||
1228 | if (phy->allocated_src == D40_ALLOC_FREE && | |
1229 | phy->allocated_dst == D40_ALLOC_FREE) { | |
1230 | dev_err(&d40c->chan.dev->device, "[%s] channel already free\n", | |
1231 | __func__); | |
1232 | return -EINVAL; | |
1233 | } | |
1234 | ||
8d318a50 LW |
1235 | res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ); |
1236 | if (res) { | |
ff0b12ba | 1237 | dev_err(&d40c->chan.dev->device, "[%s] suspend failed\n", |
8d318a50 LW |
1238 | __func__); |
1239 | return res; | |
1240 | } | |
1241 | ||
1242 | if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH || | |
1243 | d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) { | |
1244 | event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type); | |
1245 | dir = D40_CHAN_REG_SDLNK; | |
1246 | is_src = false; | |
1247 | } else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) { | |
1248 | event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type); | |
1249 | dir = D40_CHAN_REG_SSLNK; | |
1250 | is_src = true; | |
1251 | } else { | |
1252 | dev_err(&d40c->chan.dev->device, | |
1253 | "[%s] Unknown direction\n", __func__); | |
1254 | return -EINVAL; | |
1255 | } | |
1256 | ||
1257 | if (d40c->log_num != D40_PHY_CHAN) { | |
1258 | /* | |
1259 | * Release logical channel, deactivate the event line during | |
1260 | * the time physical res is suspended. | |
1261 | */ | |
1262 | writel((D40_DEACTIVATE_EVENTLINE << D40_EVENTLINE_POS(event)) & | |
1263 | D40_EVENTLINE_MASK(event), | |
1264 | d40c->base->virtbase + D40_DREG_PCBASE + | |
1265 | phy->num * D40_DREG_PCDELTA + dir); | |
1266 | ||
1267 | d40c->base->lookup_log_chans[d40c->log_num] = NULL; | |
1268 | ||
1269 | /* | |
1270 | * Check if there are more logical allocation | |
1271 | * on this phy channel. | |
1272 | */ | |
1273 | if (!d40_alloc_mask_free(phy, is_src, event)) { | |
1274 | /* Resume the other logical channels if any */ | |
1275 | if (d40_chan_has_events(d40c)) { | |
1276 | res = d40_channel_execute_command(d40c, | |
1277 | D40_DMA_RUN); | |
1278 | if (res) { | |
1279 | dev_err(&d40c->chan.dev->device, | |
1280 | "[%s] Executing RUN command\n", | |
1281 | __func__); | |
1282 | return res; | |
1283 | } | |
1284 | } | |
1285 | return 0; | |
1286 | } | |
1287 | } else | |
1288 | d40_alloc_mask_free(phy, is_src, 0); | |
1289 | ||
1290 | /* Release physical channel */ | |
1291 | res = d40_channel_execute_command(d40c, D40_DMA_STOP); | |
1292 | if (res) { | |
1293 | dev_err(&d40c->chan.dev->device, | |
1294 | "[%s] Failed to stop channel\n", __func__); | |
1295 | return res; | |
1296 | } | |
1297 | d40c->phy_chan = NULL; | |
1298 | /* Invalidate channel type */ | |
1299 | d40c->dma_cfg.channel_type = 0; | |
1300 | d40c->base->lookup_phy_chans[phy->num] = NULL; | |
1301 | ||
1302 | return 0; | |
8d318a50 LW |
1303 | } |
1304 | ||
1305 | static int d40_pause(struct dma_chan *chan) | |
1306 | { | |
1307 | struct d40_chan *d40c = | |
1308 | container_of(chan, struct d40_chan, chan); | |
1309 | int res; | |
8d318a50 LW |
1310 | unsigned long flags; |
1311 | ||
1312 | spin_lock_irqsave(&d40c->lock, flags); | |
1313 | ||
1314 | res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ); | |
1315 | if (res == 0) { | |
1316 | if (d40c->log_num != D40_PHY_CHAN) { | |
1317 | d40_config_set_event(d40c, false); | |
1318 | /* Resume the other logical channels if any */ | |
1319 | if (d40_chan_has_events(d40c)) | |
1320 | res = d40_channel_execute_command(d40c, | |
1321 | D40_DMA_RUN); | |
1322 | } | |
1323 | } | |
1324 | ||
1325 | spin_unlock_irqrestore(&d40c->lock, flags); | |
1326 | return res; | |
1327 | } | |
1328 | ||
a5ebca47 JA |
1329 | static bool d40_is_paused(struct d40_chan *d40c) |
1330 | { | |
1331 | bool is_paused = false; | |
1332 | unsigned long flags; | |
1333 | void __iomem *active_reg; | |
1334 | u32 status; | |
1335 | u32 event; | |
a5ebca47 JA |
1336 | |
1337 | spin_lock_irqsave(&d40c->lock, flags); | |
1338 | ||
1339 | if (d40c->log_num == D40_PHY_CHAN) { | |
1340 | if (d40c->phy_chan->num % 2 == 0) | |
1341 | active_reg = d40c->base->virtbase + D40_DREG_ACTIVE; | |
1342 | else | |
1343 | active_reg = d40c->base->virtbase + D40_DREG_ACTIVO; | |
1344 | ||
1345 | status = (readl(active_reg) & | |
1346 | D40_CHAN_POS_MASK(d40c->phy_chan->num)) >> | |
1347 | D40_CHAN_POS(d40c->phy_chan->num); | |
1348 | if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP) | |
1349 | is_paused = true; | |
1350 | ||
1351 | goto _exit; | |
1352 | } | |
1353 | ||
a5ebca47 JA |
1354 | if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH || |
1355 | d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) | |
1356 | event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type); | |
1357 | else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) | |
1358 | event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type); | |
1359 | else { | |
1360 | dev_err(&d40c->chan.dev->device, | |
1361 | "[%s] Unknown direction\n", __func__); | |
1362 | goto _exit; | |
1363 | } | |
1364 | status = d40_chan_has_events(d40c); | |
1365 | status = (status & D40_EVENTLINE_MASK(event)) >> | |
1366 | D40_EVENTLINE_POS(event); | |
1367 | ||
1368 | if (status != D40_DMA_RUN) | |
1369 | is_paused = true; | |
a5ebca47 JA |
1370 | _exit: |
1371 | spin_unlock_irqrestore(&d40c->lock, flags); | |
1372 | return is_paused; | |
1373 | ||
1374 | } | |
1375 | ||
1376 | ||
8d318a50 LW |
1377 | static bool d40_tx_is_linked(struct d40_chan *d40c) |
1378 | { | |
1379 | bool is_link; | |
1380 | ||
1381 | if (d40c->log_num != D40_PHY_CHAN) | |
1382 | is_link = readl(&d40c->lcpa->lcsp3) & D40_MEM_LCSP3_DLOS_MASK; | |
1383 | else | |
1384 | is_link = readl(d40c->base->virtbase + D40_DREG_PCBASE + | |
1385 | d40c->phy_chan->num * D40_DREG_PCDELTA + | |
1386 | D40_CHAN_REG_SDLNK) & | |
1387 | D40_SREG_LNK_PHYS_LNK_MASK; | |
1388 | return is_link; | |
1389 | } | |
1390 | ||
1391 | static u32 d40_residue(struct d40_chan *d40c) | |
1392 | { | |
1393 | u32 num_elt; | |
1394 | ||
1395 | if (d40c->log_num != D40_PHY_CHAN) | |
1396 | num_elt = (readl(&d40c->lcpa->lcsp2) & D40_MEM_LCSP2_ECNT_MASK) | |
1397 | >> D40_MEM_LCSP2_ECNT_POS; | |
1398 | else | |
1399 | num_elt = (readl(d40c->base->virtbase + D40_DREG_PCBASE + | |
1400 | d40c->phy_chan->num * D40_DREG_PCDELTA + | |
1401 | D40_CHAN_REG_SDELT) & | |
1402 | D40_SREG_ELEM_PHY_ECNT_MASK) >> D40_SREG_ELEM_PHY_ECNT_POS; | |
1403 | return num_elt * (1 << d40c->dma_cfg.dst_info.data_width); | |
1404 | } | |
1405 | ||
1406 | static int d40_resume(struct dma_chan *chan) | |
1407 | { | |
1408 | struct d40_chan *d40c = | |
1409 | container_of(chan, struct d40_chan, chan); | |
1410 | int res = 0; | |
1411 | unsigned long flags; | |
1412 | ||
1413 | spin_lock_irqsave(&d40c->lock, flags); | |
1414 | ||
0c32269d JA |
1415 | /* If bytes left to transfer or linked tx resume job */ |
1416 | if (d40_residue(d40c) || d40_tx_is_linked(d40c)) { | |
1417 | if (d40c->log_num != D40_PHY_CHAN) | |
8d318a50 | 1418 | d40_config_set_event(d40c, true); |
8d318a50 | 1419 | res = d40_channel_execute_command(d40c, D40_DMA_RUN); |
0c32269d | 1420 | } |
8d318a50 | 1421 | |
8d318a50 LW |
1422 | spin_unlock_irqrestore(&d40c->lock, flags); |
1423 | return res; | |
1424 | } | |
1425 | ||
1426 | static u32 stedma40_residue(struct dma_chan *chan) | |
1427 | { | |
1428 | struct d40_chan *d40c = | |
1429 | container_of(chan, struct d40_chan, chan); | |
1430 | u32 bytes_left; | |
1431 | unsigned long flags; | |
1432 | ||
1433 | spin_lock_irqsave(&d40c->lock, flags); | |
1434 | bytes_left = d40_residue(d40c); | |
1435 | spin_unlock_irqrestore(&d40c->lock, flags); | |
1436 | ||
1437 | return bytes_left; | |
1438 | } | |
1439 | ||
1440 | /* Public DMA functions in addition to the DMA engine framework */ | |
1441 | ||
1442 | int stedma40_set_psize(struct dma_chan *chan, | |
1443 | int src_psize, | |
1444 | int dst_psize) | |
1445 | { | |
1446 | struct d40_chan *d40c = | |
1447 | container_of(chan, struct d40_chan, chan); | |
1448 | unsigned long flags; | |
1449 | ||
1450 | spin_lock_irqsave(&d40c->lock, flags); | |
1451 | ||
1452 | if (d40c->log_num != D40_PHY_CHAN) { | |
1453 | d40c->log_def.lcsp1 &= ~D40_MEM_LCSP1_SCFG_PSIZE_MASK; | |
1454 | d40c->log_def.lcsp3 &= ~D40_MEM_LCSP1_SCFG_PSIZE_MASK; | |
1455 | d40c->log_def.lcsp1 |= src_psize << D40_MEM_LCSP1_SCFG_PSIZE_POS; | |
1456 | d40c->log_def.lcsp3 |= dst_psize << D40_MEM_LCSP1_SCFG_PSIZE_POS; | |
1457 | goto out; | |
1458 | } | |
1459 | ||
1460 | if (src_psize == STEDMA40_PSIZE_PHY_1) | |
1461 | d40c->src_def_cfg &= ~(1 << D40_SREG_CFG_PHY_PEN_POS); | |
1462 | else { | |
1463 | d40c->src_def_cfg |= 1 << D40_SREG_CFG_PHY_PEN_POS; | |
1464 | d40c->src_def_cfg &= ~(STEDMA40_PSIZE_PHY_16 << | |
1465 | D40_SREG_CFG_PSIZE_POS); | |
1466 | d40c->src_def_cfg |= src_psize << D40_SREG_CFG_PSIZE_POS; | |
1467 | } | |
1468 | ||
1469 | if (dst_psize == STEDMA40_PSIZE_PHY_1) | |
1470 | d40c->dst_def_cfg &= ~(1 << D40_SREG_CFG_PHY_PEN_POS); | |
1471 | else { | |
1472 | d40c->dst_def_cfg |= 1 << D40_SREG_CFG_PHY_PEN_POS; | |
1473 | d40c->dst_def_cfg &= ~(STEDMA40_PSIZE_PHY_16 << | |
1474 | D40_SREG_CFG_PSIZE_POS); | |
1475 | d40c->dst_def_cfg |= dst_psize << D40_SREG_CFG_PSIZE_POS; | |
1476 | } | |
1477 | out: | |
1478 | spin_unlock_irqrestore(&d40c->lock, flags); | |
1479 | return 0; | |
1480 | } | |
1481 | EXPORT_SYMBOL(stedma40_set_psize); | |
1482 | ||
1483 | struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan, | |
1484 | struct scatterlist *sgl_dst, | |
1485 | struct scatterlist *sgl_src, | |
1486 | unsigned int sgl_len, | |
2a614340 | 1487 | unsigned long dma_flags) |
8d318a50 LW |
1488 | { |
1489 | int res; | |
1490 | struct d40_desc *d40d; | |
1491 | struct d40_chan *d40c = container_of(chan, struct d40_chan, | |
1492 | chan); | |
2a614340 | 1493 | unsigned long flags; |
8d318a50 | 1494 | |
0d0f6b8b JA |
1495 | if (d40c->phy_chan == NULL) { |
1496 | dev_err(&d40c->chan.dev->device, | |
1497 | "[%s] Unallocated channel.\n", __func__); | |
1498 | return ERR_PTR(-EINVAL); | |
1499 | } | |
1500 | ||
2a614340 | 1501 | spin_lock_irqsave(&d40c->lock, flags); |
8d318a50 LW |
1502 | d40d = d40_desc_get(d40c); |
1503 | ||
1504 | if (d40d == NULL) | |
1505 | goto err; | |
1506 | ||
8d318a50 | 1507 | d40d->lli_len = sgl_len; |
941b77a3 | 1508 | d40d->lli_tx_len = d40d->lli_len; |
2a614340 | 1509 | d40d->txd.flags = dma_flags; |
8d318a50 LW |
1510 | |
1511 | if (d40c->log_num != D40_PHY_CHAN) { | |
941b77a3 PF |
1512 | if (d40d->lli_len > d40c->base->plat_data->llis_per_log) |
1513 | d40d->lli_tx_len = d40c->base->plat_data->llis_per_log; | |
1514 | ||
8d318a50 LW |
1515 | if (sgl_len > 1) |
1516 | /* | |
1517 | * Check if there is space available in lcla. If not, | |
1518 | * split list into 1-length and run only in lcpa | |
1519 | * space. | |
1520 | */ | |
1521 | if (d40_lcla_id_get(d40c, | |
1522 | &d40c->base->lcla_pool) != 0) | |
941b77a3 | 1523 | d40d->lli_tx_len = 1; |
8d318a50 LW |
1524 | |
1525 | if (d40_pool_lli_alloc(d40d, sgl_len, true) < 0) { | |
1526 | dev_err(&d40c->chan.dev->device, | |
1527 | "[%s] Out of memory\n", __func__); | |
1528 | goto err; | |
1529 | } | |
1530 | ||
1531 | (void) d40_log_sg_to_lli(d40c->lcla.src_id, | |
1532 | sgl_src, | |
1533 | sgl_len, | |
1534 | d40d->lli_log.src, | |
1535 | d40c->log_def.lcsp1, | |
1536 | d40c->dma_cfg.src_info.data_width, | |
2a614340 | 1537 | dma_flags & DMA_PREP_INTERRUPT, |
941b77a3 | 1538 | d40d->lli_tx_len, |
8d318a50 LW |
1539 | d40c->base->plat_data->llis_per_log); |
1540 | ||
1541 | (void) d40_log_sg_to_lli(d40c->lcla.dst_id, | |
1542 | sgl_dst, | |
1543 | sgl_len, | |
1544 | d40d->lli_log.dst, | |
1545 | d40c->log_def.lcsp3, | |
1546 | d40c->dma_cfg.dst_info.data_width, | |
2a614340 | 1547 | dma_flags & DMA_PREP_INTERRUPT, |
941b77a3 | 1548 | d40d->lli_tx_len, |
8d318a50 LW |
1549 | d40c->base->plat_data->llis_per_log); |
1550 | ||
1551 | ||
1552 | } else { | |
1553 | if (d40_pool_lli_alloc(d40d, sgl_len, false) < 0) { | |
1554 | dev_err(&d40c->chan.dev->device, | |
1555 | "[%s] Out of memory\n", __func__); | |
1556 | goto err; | |
1557 | } | |
1558 | ||
1559 | res = d40_phy_sg_to_lli(sgl_src, | |
1560 | sgl_len, | |
1561 | 0, | |
1562 | d40d->lli_phy.src, | |
1563 | d40d->lli_phy.src_addr, | |
1564 | d40c->src_def_cfg, | |
1565 | d40c->dma_cfg.src_info.data_width, | |
1566 | d40c->dma_cfg.src_info.psize, | |
1567 | true); | |
1568 | ||
1569 | if (res < 0) | |
1570 | goto err; | |
1571 | ||
1572 | res = d40_phy_sg_to_lli(sgl_dst, | |
1573 | sgl_len, | |
1574 | 0, | |
1575 | d40d->lli_phy.dst, | |
1576 | d40d->lli_phy.dst_addr, | |
1577 | d40c->dst_def_cfg, | |
1578 | d40c->dma_cfg.dst_info.data_width, | |
1579 | d40c->dma_cfg.dst_info.psize, | |
1580 | true); | |
1581 | ||
1582 | if (res < 0) | |
1583 | goto err; | |
1584 | ||
1585 | (void) dma_map_single(d40c->base->dev, d40d->lli_phy.src, | |
1586 | d40d->lli_pool.size, DMA_TO_DEVICE); | |
1587 | } | |
1588 | ||
1589 | dma_async_tx_descriptor_init(&d40d->txd, chan); | |
1590 | ||
1591 | d40d->txd.tx_submit = d40_tx_submit; | |
1592 | ||
2a614340 | 1593 | spin_unlock_irqrestore(&d40c->lock, flags); |
8d318a50 LW |
1594 | |
1595 | return &d40d->txd; | |
1596 | err: | |
2a614340 | 1597 | spin_unlock_irqrestore(&d40c->lock, flags); |
8d318a50 LW |
1598 | return NULL; |
1599 | } | |
1600 | EXPORT_SYMBOL(stedma40_memcpy_sg); | |
1601 | ||
1602 | bool stedma40_filter(struct dma_chan *chan, void *data) | |
1603 | { | |
1604 | struct stedma40_chan_cfg *info = data; | |
1605 | struct d40_chan *d40c = | |
1606 | container_of(chan, struct d40_chan, chan); | |
1607 | int err; | |
1608 | ||
1609 | if (data) { | |
1610 | err = d40_validate_conf(d40c, info); | |
1611 | if (!err) | |
1612 | d40c->dma_cfg = *info; | |
1613 | } else | |
1614 | err = d40_config_memcpy(d40c); | |
1615 | ||
1616 | return err == 0; | |
1617 | } | |
1618 | EXPORT_SYMBOL(stedma40_filter); | |
1619 | ||
1620 | /* DMA ENGINE functions */ | |
1621 | static int d40_alloc_chan_resources(struct dma_chan *chan) | |
1622 | { | |
1623 | int err; | |
1624 | unsigned long flags; | |
1625 | struct d40_chan *d40c = | |
1626 | container_of(chan, struct d40_chan, chan); | |
ef1872ec | 1627 | bool is_free_phy; |
8d318a50 LW |
1628 | spin_lock_irqsave(&d40c->lock, flags); |
1629 | ||
1630 | d40c->completed = chan->cookie = 1; | |
1631 | ||
1632 | /* | |
1633 | * If no dma configuration is set (channel_type == 0) | |
ef1872ec | 1634 | * use default configuration (memcpy) |
8d318a50 LW |
1635 | */ |
1636 | if (d40c->dma_cfg.channel_type == 0) { | |
1637 | err = d40_config_memcpy(d40c); | |
ff0b12ba JA |
1638 | if (err) { |
1639 | dev_err(&d40c->chan.dev->device, | |
1640 | "[%s] Failed to configure memcpy channel\n", | |
1641 | __func__); | |
1642 | goto fail; | |
1643 | } | |
8d318a50 | 1644 | } |
ef1872ec | 1645 | is_free_phy = (d40c->phy_chan == NULL); |
8d318a50 LW |
1646 | |
1647 | err = d40_allocate_channel(d40c); | |
1648 | if (err) { | |
1649 | dev_err(&d40c->chan.dev->device, | |
1650 | "[%s] Failed to allocate channel\n", __func__); | |
ff0b12ba | 1651 | goto fail; |
8d318a50 LW |
1652 | } |
1653 | ||
ef1872ec LW |
1654 | /* Fill in basic CFG register values */ |
1655 | d40_phy_cfg(&d40c->dma_cfg, &d40c->src_def_cfg, | |
1656 | &d40c->dst_def_cfg, d40c->log_num != D40_PHY_CHAN); | |
1657 | ||
1658 | if (d40c->log_num != D40_PHY_CHAN) { | |
1659 | d40_log_cfg(&d40c->dma_cfg, | |
1660 | &d40c->log_def.lcsp1, &d40c->log_def.lcsp3); | |
1661 | ||
1662 | if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) | |
1663 | d40c->lcpa = d40c->base->lcpa_base + | |
1664 | d40c->dma_cfg.src_dev_type * D40_LCPA_CHAN_SIZE; | |
1665 | else | |
1666 | d40c->lcpa = d40c->base->lcpa_base + | |
1667 | d40c->dma_cfg.dst_dev_type * | |
1668 | D40_LCPA_CHAN_SIZE + D40_LCPA_CHAN_DST_DELTA; | |
1669 | } | |
1670 | ||
1671 | /* | |
1672 | * Only write channel configuration to the DMA if the physical | |
1673 | * resource is free. In case of multiple logical channels | |
1674 | * on the same physical resource, only the first write is necessary. | |
1675 | */ | |
1676 | if (is_free_phy) { | |
1677 | err = d40_config_write(d40c); | |
1678 | if (err) { | |
1679 | dev_err(&d40c->chan.dev->device, | |
1680 | "[%s] Failed to configure channel\n", | |
1681 | __func__); | |
1682 | } | |
8d318a50 | 1683 | } |
ff0b12ba | 1684 | fail: |
8d318a50 | 1685 | spin_unlock_irqrestore(&d40c->lock, flags); |
ff0b12ba | 1686 | return err; |
8d318a50 LW |
1687 | } |
1688 | ||
1689 | static void d40_free_chan_resources(struct dma_chan *chan) | |
1690 | { | |
1691 | struct d40_chan *d40c = | |
1692 | container_of(chan, struct d40_chan, chan); | |
1693 | int err; | |
1694 | unsigned long flags; | |
1695 | ||
0d0f6b8b JA |
1696 | if (d40c->phy_chan == NULL) { |
1697 | dev_err(&d40c->chan.dev->device, | |
1698 | "[%s] Cannot free unallocated channel\n", __func__); | |
1699 | return; | |
1700 | } | |
1701 | ||
1702 | ||
8d318a50 LW |
1703 | spin_lock_irqsave(&d40c->lock, flags); |
1704 | ||
1705 | err = d40_free_dma(d40c); | |
1706 | ||
1707 | if (err) | |
1708 | dev_err(&d40c->chan.dev->device, | |
1709 | "[%s] Failed to free channel\n", __func__); | |
1710 | spin_unlock_irqrestore(&d40c->lock, flags); | |
1711 | } | |
1712 | ||
1713 | static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan, | |
1714 | dma_addr_t dst, | |
1715 | dma_addr_t src, | |
1716 | size_t size, | |
2a614340 | 1717 | unsigned long dma_flags) |
8d318a50 LW |
1718 | { |
1719 | struct d40_desc *d40d; | |
1720 | struct d40_chan *d40c = container_of(chan, struct d40_chan, | |
1721 | chan); | |
2a614340 | 1722 | unsigned long flags; |
8d318a50 LW |
1723 | int err = 0; |
1724 | ||
0d0f6b8b JA |
1725 | if (d40c->phy_chan == NULL) { |
1726 | dev_err(&d40c->chan.dev->device, | |
1727 | "[%s] Channel is not allocated.\n", __func__); | |
1728 | return ERR_PTR(-EINVAL); | |
1729 | } | |
1730 | ||
2a614340 | 1731 | spin_lock_irqsave(&d40c->lock, flags); |
8d318a50 LW |
1732 | d40d = d40_desc_get(d40c); |
1733 | ||
1734 | if (d40d == NULL) { | |
1735 | dev_err(&d40c->chan.dev->device, | |
1736 | "[%s] Descriptor is NULL\n", __func__); | |
1737 | goto err; | |
1738 | } | |
1739 | ||
2a614340 | 1740 | d40d->txd.flags = dma_flags; |
8d318a50 LW |
1741 | |
1742 | dma_async_tx_descriptor_init(&d40d->txd, chan); | |
1743 | ||
1744 | d40d->txd.tx_submit = d40_tx_submit; | |
1745 | ||
1746 | if (d40c->log_num != D40_PHY_CHAN) { | |
1747 | ||
1748 | if (d40_pool_lli_alloc(d40d, 1, true) < 0) { | |
1749 | dev_err(&d40c->chan.dev->device, | |
1750 | "[%s] Out of memory\n", __func__); | |
1751 | goto err; | |
1752 | } | |
1753 | d40d->lli_len = 1; | |
941b77a3 | 1754 | d40d->lli_tx_len = 1; |
8d318a50 LW |
1755 | |
1756 | d40_log_fill_lli(d40d->lli_log.src, | |
1757 | src, | |
1758 | size, | |
1759 | 0, | |
1760 | d40c->log_def.lcsp1, | |
1761 | d40c->dma_cfg.src_info.data_width, | |
1762 | true, true); | |
1763 | ||
1764 | d40_log_fill_lli(d40d->lli_log.dst, | |
1765 | dst, | |
1766 | size, | |
1767 | 0, | |
1768 | d40c->log_def.lcsp3, | |
1769 | d40c->dma_cfg.dst_info.data_width, | |
1770 | true, true); | |
1771 | ||
1772 | } else { | |
1773 | ||
1774 | if (d40_pool_lli_alloc(d40d, 1, false) < 0) { | |
1775 | dev_err(&d40c->chan.dev->device, | |
1776 | "[%s] Out of memory\n", __func__); | |
1777 | goto err; | |
1778 | } | |
1779 | ||
1780 | err = d40_phy_fill_lli(d40d->lli_phy.src, | |
1781 | src, | |
1782 | size, | |
1783 | d40c->dma_cfg.src_info.psize, | |
1784 | 0, | |
1785 | d40c->src_def_cfg, | |
1786 | true, | |
1787 | d40c->dma_cfg.src_info.data_width, | |
1788 | false); | |
1789 | if (err) | |
1790 | goto err_fill_lli; | |
1791 | ||
1792 | err = d40_phy_fill_lli(d40d->lli_phy.dst, | |
1793 | dst, | |
1794 | size, | |
1795 | d40c->dma_cfg.dst_info.psize, | |
1796 | 0, | |
1797 | d40c->dst_def_cfg, | |
1798 | true, | |
1799 | d40c->dma_cfg.dst_info.data_width, | |
1800 | false); | |
1801 | ||
1802 | if (err) | |
1803 | goto err_fill_lli; | |
1804 | ||
1805 | (void) dma_map_single(d40c->base->dev, d40d->lli_phy.src, | |
1806 | d40d->lli_pool.size, DMA_TO_DEVICE); | |
1807 | } | |
1808 | ||
2a614340 | 1809 | spin_unlock_irqrestore(&d40c->lock, flags); |
8d318a50 LW |
1810 | return &d40d->txd; |
1811 | ||
1812 | err_fill_lli: | |
1813 | dev_err(&d40c->chan.dev->device, | |
1814 | "[%s] Failed filling in PHY LLI\n", __func__); | |
1815 | d40_pool_lli_free(d40d); | |
1816 | err: | |
2a614340 | 1817 | spin_unlock_irqrestore(&d40c->lock, flags); |
8d318a50 LW |
1818 | return NULL; |
1819 | } | |
1820 | ||
1821 | static int d40_prep_slave_sg_log(struct d40_desc *d40d, | |
1822 | struct d40_chan *d40c, | |
1823 | struct scatterlist *sgl, | |
1824 | unsigned int sg_len, | |
1825 | enum dma_data_direction direction, | |
2a614340 | 1826 | unsigned long dma_flags) |
8d318a50 LW |
1827 | { |
1828 | dma_addr_t dev_addr = 0; | |
1829 | int total_size; | |
8d318a50 LW |
1830 | |
1831 | if (d40_pool_lli_alloc(d40d, sg_len, true) < 0) { | |
1832 | dev_err(&d40c->chan.dev->device, | |
1833 | "[%s] Out of memory\n", __func__); | |
1834 | return -ENOMEM; | |
1835 | } | |
1836 | ||
1837 | d40d->lli_len = sg_len; | |
941b77a3 PF |
1838 | if (d40d->lli_len <= d40c->base->plat_data->llis_per_log) |
1839 | d40d->lli_tx_len = d40d->lli_len; | |
1840 | else | |
1841 | d40d->lli_tx_len = d40c->base->plat_data->llis_per_log; | |
8d318a50 LW |
1842 | |
1843 | if (sg_len > 1) | |
1844 | /* | |
1845 | * Check if there is space available in lcla. | |
1846 | * If not, split list into 1-length and run only | |
1847 | * in lcpa space. | |
1848 | */ | |
1849 | if (d40_lcla_id_get(d40c, &d40c->base->lcla_pool) != 0) | |
941b77a3 | 1850 | d40d->lli_tx_len = 1; |
8d318a50 | 1851 | |
2a614340 | 1852 | if (direction == DMA_FROM_DEVICE) |
8d318a50 | 1853 | dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type]; |
2a614340 | 1854 | else if (direction == DMA_TO_DEVICE) |
8d318a50 | 1855 | dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type]; |
2a614340 | 1856 | else |
8d318a50 | 1857 | return -EINVAL; |
2a614340 JA |
1858 | |
1859 | total_size = d40_log_sg_to_dev(&d40c->lcla, | |
1860 | sgl, sg_len, | |
1861 | &d40d->lli_log, | |
1862 | &d40c->log_def, | |
1863 | d40c->dma_cfg.src_info.data_width, | |
1864 | d40c->dma_cfg.dst_info.data_width, | |
1865 | direction, | |
1866 | dma_flags & DMA_PREP_INTERRUPT, | |
1867 | dev_addr, d40d->lli_tx_len, | |
1868 | d40c->base->plat_data->llis_per_log); | |
1869 | ||
8d318a50 LW |
1870 | if (total_size < 0) |
1871 | return -EINVAL; | |
1872 | ||
1873 | return 0; | |
1874 | } | |
1875 | ||
1876 | static int d40_prep_slave_sg_phy(struct d40_desc *d40d, | |
1877 | struct d40_chan *d40c, | |
1878 | struct scatterlist *sgl, | |
1879 | unsigned int sgl_len, | |
1880 | enum dma_data_direction direction, | |
2a614340 | 1881 | unsigned long dma_flags) |
8d318a50 LW |
1882 | { |
1883 | dma_addr_t src_dev_addr; | |
1884 | dma_addr_t dst_dev_addr; | |
1885 | int res; | |
1886 | ||
1887 | if (d40_pool_lli_alloc(d40d, sgl_len, false) < 0) { | |
1888 | dev_err(&d40c->chan.dev->device, | |
1889 | "[%s] Out of memory\n", __func__); | |
1890 | return -ENOMEM; | |
1891 | } | |
1892 | ||
1893 | d40d->lli_len = sgl_len; | |
941b77a3 | 1894 | d40d->lli_tx_len = sgl_len; |
8d318a50 LW |
1895 | |
1896 | if (direction == DMA_FROM_DEVICE) { | |
1897 | dst_dev_addr = 0; | |
1898 | src_dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type]; | |
1899 | } else if (direction == DMA_TO_DEVICE) { | |
1900 | dst_dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type]; | |
1901 | src_dev_addr = 0; | |
1902 | } else | |
1903 | return -EINVAL; | |
1904 | ||
1905 | res = d40_phy_sg_to_lli(sgl, | |
1906 | sgl_len, | |
1907 | src_dev_addr, | |
1908 | d40d->lli_phy.src, | |
1909 | d40d->lli_phy.src_addr, | |
1910 | d40c->src_def_cfg, | |
1911 | d40c->dma_cfg.src_info.data_width, | |
1912 | d40c->dma_cfg.src_info.psize, | |
1913 | true); | |
1914 | if (res < 0) | |
1915 | return res; | |
1916 | ||
1917 | res = d40_phy_sg_to_lli(sgl, | |
1918 | sgl_len, | |
1919 | dst_dev_addr, | |
1920 | d40d->lli_phy.dst, | |
1921 | d40d->lli_phy.dst_addr, | |
1922 | d40c->dst_def_cfg, | |
1923 | d40c->dma_cfg.dst_info.data_width, | |
1924 | d40c->dma_cfg.dst_info.psize, | |
1925 | true); | |
1926 | if (res < 0) | |
1927 | return res; | |
1928 | ||
1929 | (void) dma_map_single(d40c->base->dev, d40d->lli_phy.src, | |
1930 | d40d->lli_pool.size, DMA_TO_DEVICE); | |
1931 | return 0; | |
1932 | } | |
1933 | ||
1934 | static struct dma_async_tx_descriptor *d40_prep_slave_sg(struct dma_chan *chan, | |
1935 | struct scatterlist *sgl, | |
1936 | unsigned int sg_len, | |
1937 | enum dma_data_direction direction, | |
2a614340 | 1938 | unsigned long dma_flags) |
8d318a50 LW |
1939 | { |
1940 | struct d40_desc *d40d; | |
1941 | struct d40_chan *d40c = container_of(chan, struct d40_chan, | |
1942 | chan); | |
2a614340 | 1943 | unsigned long flags; |
8d318a50 LW |
1944 | int err; |
1945 | ||
0d0f6b8b JA |
1946 | if (d40c->phy_chan == NULL) { |
1947 | dev_err(&d40c->chan.dev->device, | |
1948 | "[%s] Cannot prepare unallocated channel\n", __func__); | |
1949 | return ERR_PTR(-EINVAL); | |
1950 | } | |
1951 | ||
8d318a50 LW |
1952 | if (d40c->dma_cfg.pre_transfer) |
1953 | d40c->dma_cfg.pre_transfer(chan, | |
1954 | d40c->dma_cfg.pre_transfer_data, | |
1955 | sg_dma_len(sgl)); | |
1956 | ||
2a614340 | 1957 | spin_lock_irqsave(&d40c->lock, flags); |
8d318a50 | 1958 | d40d = d40_desc_get(d40c); |
2a614340 | 1959 | spin_unlock_irqrestore(&d40c->lock, flags); |
8d318a50 LW |
1960 | |
1961 | if (d40d == NULL) | |
1962 | return NULL; | |
1963 | ||
8d318a50 LW |
1964 | if (d40c->log_num != D40_PHY_CHAN) |
1965 | err = d40_prep_slave_sg_log(d40d, d40c, sgl, sg_len, | |
2a614340 | 1966 | direction, dma_flags); |
8d318a50 LW |
1967 | else |
1968 | err = d40_prep_slave_sg_phy(d40d, d40c, sgl, sg_len, | |
2a614340 | 1969 | direction, dma_flags); |
8d318a50 LW |
1970 | if (err) { |
1971 | dev_err(&d40c->chan.dev->device, | |
1972 | "[%s] Failed to prepare %s slave sg job: %d\n", | |
1973 | __func__, | |
1974 | d40c->log_num != D40_PHY_CHAN ? "log" : "phy", err); | |
1975 | return NULL; | |
1976 | } | |
1977 | ||
2a614340 | 1978 | d40d->txd.flags = dma_flags; |
8d318a50 LW |
1979 | |
1980 | dma_async_tx_descriptor_init(&d40d->txd, chan); | |
1981 | ||
1982 | d40d->txd.tx_submit = d40_tx_submit; | |
1983 | ||
1984 | return &d40d->txd; | |
1985 | } | |
1986 | ||
1987 | static enum dma_status d40_tx_status(struct dma_chan *chan, | |
1988 | dma_cookie_t cookie, | |
1989 | struct dma_tx_state *txstate) | |
1990 | { | |
1991 | struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); | |
1992 | dma_cookie_t last_used; | |
1993 | dma_cookie_t last_complete; | |
1994 | int ret; | |
1995 | ||
0d0f6b8b JA |
1996 | if (d40c->phy_chan == NULL) { |
1997 | dev_err(&d40c->chan.dev->device, | |
1998 | "[%s] Cannot read status of unallocated channel\n", | |
1999 | __func__); | |
2000 | return -EINVAL; | |
2001 | } | |
2002 | ||
8d318a50 LW |
2003 | last_complete = d40c->completed; |
2004 | last_used = chan->cookie; | |
2005 | ||
a5ebca47 JA |
2006 | if (d40_is_paused(d40c)) |
2007 | ret = DMA_PAUSED; | |
2008 | else | |
2009 | ret = dma_async_is_complete(cookie, last_complete, last_used); | |
8d318a50 | 2010 | |
a5ebca47 JA |
2011 | dma_set_tx_state(txstate, last_complete, last_used, |
2012 | stedma40_residue(chan)); | |
8d318a50 LW |
2013 | |
2014 | return ret; | |
2015 | } | |
2016 | ||
2017 | static void d40_issue_pending(struct dma_chan *chan) | |
2018 | { | |
2019 | struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); | |
2020 | unsigned long flags; | |
2021 | ||
0d0f6b8b JA |
2022 | if (d40c->phy_chan == NULL) { |
2023 | dev_err(&d40c->chan.dev->device, | |
2024 | "[%s] Channel is not allocated!\n", __func__); | |
2025 | return; | |
2026 | } | |
2027 | ||
8d318a50 LW |
2028 | spin_lock_irqsave(&d40c->lock, flags); |
2029 | ||
2030 | /* Busy means that pending jobs are already being processed */ | |
2031 | if (!d40c->busy) | |
2032 | (void) d40_queue_start(d40c); | |
2033 | ||
2034 | spin_unlock_irqrestore(&d40c->lock, flags); | |
2035 | } | |
2036 | ||
05827630 LW |
2037 | static int d40_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
2038 | unsigned long arg) | |
8d318a50 LW |
2039 | { |
2040 | unsigned long flags; | |
2041 | struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); | |
2042 | ||
0d0f6b8b JA |
2043 | if (d40c->phy_chan == NULL) { |
2044 | dev_err(&d40c->chan.dev->device, | |
2045 | "[%s] Channel is not allocated!\n", __func__); | |
2046 | return -EINVAL; | |
2047 | } | |
2048 | ||
8d318a50 LW |
2049 | switch (cmd) { |
2050 | case DMA_TERMINATE_ALL: | |
2051 | spin_lock_irqsave(&d40c->lock, flags); | |
2052 | d40_term_all(d40c); | |
2053 | spin_unlock_irqrestore(&d40c->lock, flags); | |
2054 | return 0; | |
2055 | case DMA_PAUSE: | |
2056 | return d40_pause(chan); | |
2057 | case DMA_RESUME: | |
2058 | return d40_resume(chan); | |
2059 | } | |
2060 | ||
2061 | /* Other commands are unimplemented */ | |
2062 | return -ENXIO; | |
2063 | } | |
2064 | ||
2065 | /* Initialization functions */ | |
2066 | ||
2067 | static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma, | |
2068 | struct d40_chan *chans, int offset, | |
2069 | int num_chans) | |
2070 | { | |
2071 | int i = 0; | |
2072 | struct d40_chan *d40c; | |
2073 | ||
2074 | INIT_LIST_HEAD(&dma->channels); | |
2075 | ||
2076 | for (i = offset; i < offset + num_chans; i++) { | |
2077 | d40c = &chans[i]; | |
2078 | d40c->base = base; | |
2079 | d40c->chan.device = dma; | |
2080 | ||
2081 | /* Invalidate lcla element */ | |
2082 | d40c->lcla.src_id = -1; | |
2083 | d40c->lcla.dst_id = -1; | |
2084 | ||
2085 | spin_lock_init(&d40c->lock); | |
2086 | ||
2087 | d40c->log_num = D40_PHY_CHAN; | |
2088 | ||
8d318a50 LW |
2089 | INIT_LIST_HEAD(&d40c->active); |
2090 | INIT_LIST_HEAD(&d40c->queue); | |
2091 | INIT_LIST_HEAD(&d40c->client); | |
2092 | ||
8d318a50 LW |
2093 | tasklet_init(&d40c->tasklet, dma_tasklet, |
2094 | (unsigned long) d40c); | |
2095 | ||
2096 | list_add_tail(&d40c->chan.device_node, | |
2097 | &dma->channels); | |
2098 | } | |
2099 | } | |
2100 | ||
2101 | static int __init d40_dmaengine_init(struct d40_base *base, | |
2102 | int num_reserved_chans) | |
2103 | { | |
2104 | int err ; | |
2105 | ||
2106 | d40_chan_init(base, &base->dma_slave, base->log_chans, | |
2107 | 0, base->num_log_chans); | |
2108 | ||
2109 | dma_cap_zero(base->dma_slave.cap_mask); | |
2110 | dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask); | |
2111 | ||
2112 | base->dma_slave.device_alloc_chan_resources = d40_alloc_chan_resources; | |
2113 | base->dma_slave.device_free_chan_resources = d40_free_chan_resources; | |
2114 | base->dma_slave.device_prep_dma_memcpy = d40_prep_memcpy; | |
2115 | base->dma_slave.device_prep_slave_sg = d40_prep_slave_sg; | |
2116 | base->dma_slave.device_tx_status = d40_tx_status; | |
2117 | base->dma_slave.device_issue_pending = d40_issue_pending; | |
2118 | base->dma_slave.device_control = d40_control; | |
2119 | base->dma_slave.dev = base->dev; | |
2120 | ||
2121 | err = dma_async_device_register(&base->dma_slave); | |
2122 | ||
2123 | if (err) { | |
2124 | dev_err(base->dev, | |
2125 | "[%s] Failed to register slave channels\n", | |
2126 | __func__); | |
2127 | goto failure1; | |
2128 | } | |
2129 | ||
2130 | d40_chan_init(base, &base->dma_memcpy, base->log_chans, | |
2131 | base->num_log_chans, base->plat_data->memcpy_len); | |
2132 | ||
2133 | dma_cap_zero(base->dma_memcpy.cap_mask); | |
2134 | dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask); | |
2135 | ||
2136 | base->dma_memcpy.device_alloc_chan_resources = d40_alloc_chan_resources; | |
2137 | base->dma_memcpy.device_free_chan_resources = d40_free_chan_resources; | |
2138 | base->dma_memcpy.device_prep_dma_memcpy = d40_prep_memcpy; | |
2139 | base->dma_memcpy.device_prep_slave_sg = d40_prep_slave_sg; | |
2140 | base->dma_memcpy.device_tx_status = d40_tx_status; | |
2141 | base->dma_memcpy.device_issue_pending = d40_issue_pending; | |
2142 | base->dma_memcpy.device_control = d40_control; | |
2143 | base->dma_memcpy.dev = base->dev; | |
2144 | /* | |
2145 | * This controller can only access address at even | |
2146 | * 32bit boundaries, i.e. 2^2 | |
2147 | */ | |
2148 | base->dma_memcpy.copy_align = 2; | |
2149 | ||
2150 | err = dma_async_device_register(&base->dma_memcpy); | |
2151 | ||
2152 | if (err) { | |
2153 | dev_err(base->dev, | |
2154 | "[%s] Failed to regsiter memcpy only channels\n", | |
2155 | __func__); | |
2156 | goto failure2; | |
2157 | } | |
2158 | ||
2159 | d40_chan_init(base, &base->dma_both, base->phy_chans, | |
2160 | 0, num_reserved_chans); | |
2161 | ||
2162 | dma_cap_zero(base->dma_both.cap_mask); | |
2163 | dma_cap_set(DMA_SLAVE, base->dma_both.cap_mask); | |
2164 | dma_cap_set(DMA_MEMCPY, base->dma_both.cap_mask); | |
2165 | ||
2166 | base->dma_both.device_alloc_chan_resources = d40_alloc_chan_resources; | |
2167 | base->dma_both.device_free_chan_resources = d40_free_chan_resources; | |
2168 | base->dma_both.device_prep_dma_memcpy = d40_prep_memcpy; | |
2169 | base->dma_both.device_prep_slave_sg = d40_prep_slave_sg; | |
2170 | base->dma_both.device_tx_status = d40_tx_status; | |
2171 | base->dma_both.device_issue_pending = d40_issue_pending; | |
2172 | base->dma_both.device_control = d40_control; | |
2173 | base->dma_both.dev = base->dev; | |
2174 | base->dma_both.copy_align = 2; | |
2175 | err = dma_async_device_register(&base->dma_both); | |
2176 | ||
2177 | if (err) { | |
2178 | dev_err(base->dev, | |
2179 | "[%s] Failed to register logical and physical capable channels\n", | |
2180 | __func__); | |
2181 | goto failure3; | |
2182 | } | |
2183 | return 0; | |
2184 | failure3: | |
2185 | dma_async_device_unregister(&base->dma_memcpy); | |
2186 | failure2: | |
2187 | dma_async_device_unregister(&base->dma_slave); | |
2188 | failure1: | |
2189 | return err; | |
2190 | } | |
2191 | ||
2192 | /* Initialization functions. */ | |
2193 | ||
2194 | static int __init d40_phy_res_init(struct d40_base *base) | |
2195 | { | |
2196 | int i; | |
2197 | int num_phy_chans_avail = 0; | |
2198 | u32 val[2]; | |
2199 | int odd_even_bit = -2; | |
2200 | ||
2201 | val[0] = readl(base->virtbase + D40_DREG_PRSME); | |
2202 | val[1] = readl(base->virtbase + D40_DREG_PRSMO); | |
2203 | ||
2204 | for (i = 0; i < base->num_phy_chans; i++) { | |
2205 | base->phy_res[i].num = i; | |
2206 | odd_even_bit += 2 * ((i % 2) == 0); | |
2207 | if (((val[i % 2] >> odd_even_bit) & 3) == 1) { | |
2208 | /* Mark security only channels as occupied */ | |
2209 | base->phy_res[i].allocated_src = D40_ALLOC_PHY; | |
2210 | base->phy_res[i].allocated_dst = D40_ALLOC_PHY; | |
2211 | } else { | |
2212 | base->phy_res[i].allocated_src = D40_ALLOC_FREE; | |
2213 | base->phy_res[i].allocated_dst = D40_ALLOC_FREE; | |
2214 | num_phy_chans_avail++; | |
2215 | } | |
2216 | spin_lock_init(&base->phy_res[i].lock); | |
2217 | } | |
2218 | dev_info(base->dev, "%d of %d physical DMA channels available\n", | |
2219 | num_phy_chans_avail, base->num_phy_chans); | |
2220 | ||
2221 | /* Verify settings extended vs standard */ | |
2222 | val[0] = readl(base->virtbase + D40_DREG_PRTYP); | |
2223 | ||
2224 | for (i = 0; i < base->num_phy_chans; i++) { | |
2225 | ||
2226 | if (base->phy_res[i].allocated_src == D40_ALLOC_FREE && | |
2227 | (val[0] & 0x3) != 1) | |
2228 | dev_info(base->dev, | |
2229 | "[%s] INFO: channel %d is misconfigured (%d)\n", | |
2230 | __func__, i, val[0] & 0x3); | |
2231 | ||
2232 | val[0] = val[0] >> 2; | |
2233 | } | |
2234 | ||
2235 | return num_phy_chans_avail; | |
2236 | } | |
2237 | ||
2238 | static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev) | |
2239 | { | |
2240 | static const struct d40_reg_val dma_id_regs[] = { | |
2241 | /* Peripheral Id */ | |
2242 | { .reg = D40_DREG_PERIPHID0, .val = 0x0040}, | |
2243 | { .reg = D40_DREG_PERIPHID1, .val = 0x0000}, | |
2244 | /* | |
2245 | * D40_DREG_PERIPHID2 Depends on HW revision: | |
2246 | * MOP500/HREF ED has 0x0008, | |
2247 | * ? has 0x0018, | |
2248 | * HREF V1 has 0x0028 | |
2249 | */ | |
2250 | { .reg = D40_DREG_PERIPHID3, .val = 0x0000}, | |
2251 | ||
2252 | /* PCell Id */ | |
2253 | { .reg = D40_DREG_CELLID0, .val = 0x000d}, | |
2254 | { .reg = D40_DREG_CELLID1, .val = 0x00f0}, | |
2255 | { .reg = D40_DREG_CELLID2, .val = 0x0005}, | |
2256 | { .reg = D40_DREG_CELLID3, .val = 0x00b1} | |
2257 | }; | |
2258 | struct stedma40_platform_data *plat_data; | |
2259 | struct clk *clk = NULL; | |
2260 | void __iomem *virtbase = NULL; | |
2261 | struct resource *res = NULL; | |
2262 | struct d40_base *base = NULL; | |
2263 | int num_log_chans = 0; | |
2264 | int num_phy_chans; | |
2265 | int i; | |
2266 | ||
2267 | clk = clk_get(&pdev->dev, NULL); | |
2268 | ||
2269 | if (IS_ERR(clk)) { | |
2270 | dev_err(&pdev->dev, "[%s] No matching clock found\n", | |
2271 | __func__); | |
2272 | goto failure; | |
2273 | } | |
2274 | ||
2275 | clk_enable(clk); | |
2276 | ||
2277 | /* Get IO for DMAC base address */ | |
2278 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base"); | |
2279 | if (!res) | |
2280 | goto failure; | |
2281 | ||
2282 | if (request_mem_region(res->start, resource_size(res), | |
2283 | D40_NAME " I/O base") == NULL) | |
2284 | goto failure; | |
2285 | ||
2286 | virtbase = ioremap(res->start, resource_size(res)); | |
2287 | if (!virtbase) | |
2288 | goto failure; | |
2289 | ||
2290 | /* HW version check */ | |
2291 | for (i = 0; i < ARRAY_SIZE(dma_id_regs); i++) { | |
2292 | if (dma_id_regs[i].val != | |
2293 | readl(virtbase + dma_id_regs[i].reg)) { | |
2294 | dev_err(&pdev->dev, | |
2295 | "[%s] Unknown hardware! Expected 0x%x at 0x%x but got 0x%x\n", | |
2296 | __func__, | |
2297 | dma_id_regs[i].val, | |
2298 | dma_id_regs[i].reg, | |
2299 | readl(virtbase + dma_id_regs[i].reg)); | |
2300 | goto failure; | |
2301 | } | |
2302 | } | |
2303 | ||
2304 | i = readl(virtbase + D40_DREG_PERIPHID2); | |
2305 | ||
2306 | if ((i & 0xf) != D40_PERIPHID2_DESIGNER) { | |
2307 | dev_err(&pdev->dev, | |
2308 | "[%s] Unknown designer! Got %x wanted %x\n", | |
2309 | __func__, i & 0xf, D40_PERIPHID2_DESIGNER); | |
2310 | goto failure; | |
2311 | } | |
2312 | ||
2313 | /* The number of physical channels on this HW */ | |
2314 | num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4; | |
2315 | ||
2316 | dev_info(&pdev->dev, "hardware revision: %d @ 0x%x\n", | |
2317 | (i >> 4) & 0xf, res->start); | |
2318 | ||
2319 | plat_data = pdev->dev.platform_data; | |
2320 | ||
2321 | /* Count the number of logical channels in use */ | |
2322 | for (i = 0; i < plat_data->dev_len; i++) | |
2323 | if (plat_data->dev_rx[i] != 0) | |
2324 | num_log_chans++; | |
2325 | ||
2326 | for (i = 0; i < plat_data->dev_len; i++) | |
2327 | if (plat_data->dev_tx[i] != 0) | |
2328 | num_log_chans++; | |
2329 | ||
2330 | base = kzalloc(ALIGN(sizeof(struct d40_base), 4) + | |
2331 | (num_phy_chans + num_log_chans + plat_data->memcpy_len) * | |
2332 | sizeof(struct d40_chan), GFP_KERNEL); | |
2333 | ||
2334 | if (base == NULL) { | |
2335 | dev_err(&pdev->dev, "[%s] Out of memory\n", __func__); | |
2336 | goto failure; | |
2337 | } | |
2338 | ||
2339 | base->clk = clk; | |
2340 | base->num_phy_chans = num_phy_chans; | |
2341 | base->num_log_chans = num_log_chans; | |
2342 | base->phy_start = res->start; | |
2343 | base->phy_size = resource_size(res); | |
2344 | base->virtbase = virtbase; | |
2345 | base->plat_data = plat_data; | |
2346 | base->dev = &pdev->dev; | |
2347 | base->phy_chans = ((void *)base) + ALIGN(sizeof(struct d40_base), 4); | |
2348 | base->log_chans = &base->phy_chans[num_phy_chans]; | |
2349 | ||
2350 | base->phy_res = kzalloc(num_phy_chans * sizeof(struct d40_phy_res), | |
2351 | GFP_KERNEL); | |
2352 | if (!base->phy_res) | |
2353 | goto failure; | |
2354 | ||
2355 | base->lookup_phy_chans = kzalloc(num_phy_chans * | |
2356 | sizeof(struct d40_chan *), | |
2357 | GFP_KERNEL); | |
2358 | if (!base->lookup_phy_chans) | |
2359 | goto failure; | |
2360 | ||
2361 | if (num_log_chans + plat_data->memcpy_len) { | |
2362 | /* | |
2363 | * The max number of logical channels are event lines for all | |
2364 | * src devices and dst devices | |
2365 | */ | |
2366 | base->lookup_log_chans = kzalloc(plat_data->dev_len * 2 * | |
2367 | sizeof(struct d40_chan *), | |
2368 | GFP_KERNEL); | |
2369 | if (!base->lookup_log_chans) | |
2370 | goto failure; | |
2371 | } | |
2372 | base->lcla_pool.alloc_map = kzalloc(num_phy_chans * sizeof(u32), | |
2373 | GFP_KERNEL); | |
2374 | if (!base->lcla_pool.alloc_map) | |
2375 | goto failure; | |
2376 | ||
c675b1b4 JA |
2377 | base->desc_slab = kmem_cache_create(D40_NAME, sizeof(struct d40_desc), |
2378 | 0, SLAB_HWCACHE_ALIGN, | |
2379 | NULL); | |
2380 | if (base->desc_slab == NULL) | |
2381 | goto failure; | |
2382 | ||
8d318a50 LW |
2383 | return base; |
2384 | ||
2385 | failure: | |
2386 | if (clk) { | |
2387 | clk_disable(clk); | |
2388 | clk_put(clk); | |
2389 | } | |
2390 | if (virtbase) | |
2391 | iounmap(virtbase); | |
2392 | if (res) | |
2393 | release_mem_region(res->start, | |
2394 | resource_size(res)); | |
2395 | if (virtbase) | |
2396 | iounmap(virtbase); | |
2397 | ||
2398 | if (base) { | |
2399 | kfree(base->lcla_pool.alloc_map); | |
2400 | kfree(base->lookup_log_chans); | |
2401 | kfree(base->lookup_phy_chans); | |
2402 | kfree(base->phy_res); | |
2403 | kfree(base); | |
2404 | } | |
2405 | ||
2406 | return NULL; | |
2407 | } | |
2408 | ||
2409 | static void __init d40_hw_init(struct d40_base *base) | |
2410 | { | |
2411 | ||
2412 | static const struct d40_reg_val dma_init_reg[] = { | |
2413 | /* Clock every part of the DMA block from start */ | |
2414 | { .reg = D40_DREG_GCC, .val = 0x0000ff01}, | |
2415 | ||
2416 | /* Interrupts on all logical channels */ | |
2417 | { .reg = D40_DREG_LCMIS0, .val = 0xFFFFFFFF}, | |
2418 | { .reg = D40_DREG_LCMIS1, .val = 0xFFFFFFFF}, | |
2419 | { .reg = D40_DREG_LCMIS2, .val = 0xFFFFFFFF}, | |
2420 | { .reg = D40_DREG_LCMIS3, .val = 0xFFFFFFFF}, | |
2421 | { .reg = D40_DREG_LCICR0, .val = 0xFFFFFFFF}, | |
2422 | { .reg = D40_DREG_LCICR1, .val = 0xFFFFFFFF}, | |
2423 | { .reg = D40_DREG_LCICR2, .val = 0xFFFFFFFF}, | |
2424 | { .reg = D40_DREG_LCICR3, .val = 0xFFFFFFFF}, | |
2425 | { .reg = D40_DREG_LCTIS0, .val = 0xFFFFFFFF}, | |
2426 | { .reg = D40_DREG_LCTIS1, .val = 0xFFFFFFFF}, | |
2427 | { .reg = D40_DREG_LCTIS2, .val = 0xFFFFFFFF}, | |
2428 | { .reg = D40_DREG_LCTIS3, .val = 0xFFFFFFFF} | |
2429 | }; | |
2430 | int i; | |
2431 | u32 prmseo[2] = {0, 0}; | |
2432 | u32 activeo[2] = {0xFFFFFFFF, 0xFFFFFFFF}; | |
2433 | u32 pcmis = 0; | |
2434 | u32 pcicr = 0; | |
2435 | ||
2436 | for (i = 0; i < ARRAY_SIZE(dma_init_reg); i++) | |
2437 | writel(dma_init_reg[i].val, | |
2438 | base->virtbase + dma_init_reg[i].reg); | |
2439 | ||
2440 | /* Configure all our dma channels to default settings */ | |
2441 | for (i = 0; i < base->num_phy_chans; i++) { | |
2442 | ||
2443 | activeo[i % 2] = activeo[i % 2] << 2; | |
2444 | ||
2445 | if (base->phy_res[base->num_phy_chans - i - 1].allocated_src | |
2446 | == D40_ALLOC_PHY) { | |
2447 | activeo[i % 2] |= 3; | |
2448 | continue; | |
2449 | } | |
2450 | ||
2451 | /* Enable interrupt # */ | |
2452 | pcmis = (pcmis << 1) | 1; | |
2453 | ||
2454 | /* Clear interrupt # */ | |
2455 | pcicr = (pcicr << 1) | 1; | |
2456 | ||
2457 | /* Set channel to physical mode */ | |
2458 | prmseo[i % 2] = prmseo[i % 2] << 2; | |
2459 | prmseo[i % 2] |= 1; | |
2460 | ||
2461 | } | |
2462 | ||
2463 | writel(prmseo[1], base->virtbase + D40_DREG_PRMSE); | |
2464 | writel(prmseo[0], base->virtbase + D40_DREG_PRMSO); | |
2465 | writel(activeo[1], base->virtbase + D40_DREG_ACTIVE); | |
2466 | writel(activeo[0], base->virtbase + D40_DREG_ACTIVO); | |
2467 | ||
2468 | /* Write which interrupt to enable */ | |
2469 | writel(pcmis, base->virtbase + D40_DREG_PCMIS); | |
2470 | ||
2471 | /* Write which interrupt to clear */ | |
2472 | writel(pcicr, base->virtbase + D40_DREG_PCICR); | |
2473 | ||
2474 | } | |
2475 | ||
2476 | static int __init d40_probe(struct platform_device *pdev) | |
2477 | { | |
2478 | int err; | |
2479 | int ret = -ENOENT; | |
2480 | struct d40_base *base; | |
2481 | struct resource *res = NULL; | |
2482 | int num_reserved_chans; | |
2483 | u32 val; | |
2484 | ||
2485 | base = d40_hw_detect_init(pdev); | |
2486 | ||
2487 | if (!base) | |
2488 | goto failure; | |
2489 | ||
2490 | num_reserved_chans = d40_phy_res_init(base); | |
2491 | ||
2492 | platform_set_drvdata(pdev, base); | |
2493 | ||
2494 | spin_lock_init(&base->interrupt_lock); | |
2495 | spin_lock_init(&base->execmd_lock); | |
2496 | ||
2497 | /* Get IO for logical channel parameter address */ | |
2498 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcpa"); | |
2499 | if (!res) { | |
2500 | ret = -ENOENT; | |
2501 | dev_err(&pdev->dev, | |
2502 | "[%s] No \"lcpa\" memory resource\n", | |
2503 | __func__); | |
2504 | goto failure; | |
2505 | } | |
2506 | base->lcpa_size = resource_size(res); | |
2507 | base->phy_lcpa = res->start; | |
2508 | ||
2509 | if (request_mem_region(res->start, resource_size(res), | |
2510 | D40_NAME " I/O lcpa") == NULL) { | |
2511 | ret = -EBUSY; | |
2512 | dev_err(&pdev->dev, | |
2513 | "[%s] Failed to request LCPA region 0x%x-0x%x\n", | |
2514 | __func__, res->start, res->end); | |
2515 | goto failure; | |
2516 | } | |
2517 | ||
2518 | /* We make use of ESRAM memory for this. */ | |
2519 | val = readl(base->virtbase + D40_DREG_LCPA); | |
2520 | if (res->start != val && val != 0) { | |
2521 | dev_warn(&pdev->dev, | |
2522 | "[%s] Mismatch LCPA dma 0x%x, def 0x%x\n", | |
2523 | __func__, val, res->start); | |
2524 | } else | |
2525 | writel(res->start, base->virtbase + D40_DREG_LCPA); | |
2526 | ||
2527 | base->lcpa_base = ioremap(res->start, resource_size(res)); | |
2528 | if (!base->lcpa_base) { | |
2529 | ret = -ENOMEM; | |
2530 | dev_err(&pdev->dev, | |
2531 | "[%s] Failed to ioremap LCPA region\n", | |
2532 | __func__); | |
2533 | goto failure; | |
2534 | } | |
2535 | /* Get IO for logical channel link address */ | |
2536 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcla"); | |
2537 | if (!res) { | |
2538 | ret = -ENOENT; | |
2539 | dev_err(&pdev->dev, | |
2540 | "[%s] No \"lcla\" resource defined\n", | |
2541 | __func__); | |
2542 | goto failure; | |
2543 | } | |
2544 | ||
2545 | base->lcla_pool.base_size = resource_size(res); | |
2546 | base->lcla_pool.phy = res->start; | |
2547 | ||
2548 | if (request_mem_region(res->start, resource_size(res), | |
2549 | D40_NAME " I/O lcla") == NULL) { | |
2550 | ret = -EBUSY; | |
2551 | dev_err(&pdev->dev, | |
2552 | "[%s] Failed to request LCLA region 0x%x-0x%x\n", | |
2553 | __func__, res->start, res->end); | |
2554 | goto failure; | |
2555 | } | |
2556 | val = readl(base->virtbase + D40_DREG_LCLA); | |
2557 | if (res->start != val && val != 0) { | |
2558 | dev_warn(&pdev->dev, | |
2559 | "[%s] Mismatch LCLA dma 0x%x, def 0x%x\n", | |
2560 | __func__, val, res->start); | |
2561 | } else | |
2562 | writel(res->start, base->virtbase + D40_DREG_LCLA); | |
2563 | ||
2564 | base->lcla_pool.base = ioremap(res->start, resource_size(res)); | |
2565 | if (!base->lcla_pool.base) { | |
2566 | ret = -ENOMEM; | |
2567 | dev_err(&pdev->dev, | |
2568 | "[%s] Failed to ioremap LCLA 0x%x-0x%x\n", | |
2569 | __func__, res->start, res->end); | |
2570 | goto failure; | |
2571 | } | |
2572 | ||
2573 | spin_lock_init(&base->lcla_pool.lock); | |
2574 | ||
2575 | base->lcla_pool.num_blocks = base->num_phy_chans; | |
2576 | ||
2577 | base->irq = platform_get_irq(pdev, 0); | |
2578 | ||
2579 | ret = request_irq(base->irq, d40_handle_interrupt, 0, D40_NAME, base); | |
2580 | ||
2581 | if (ret) { | |
2582 | dev_err(&pdev->dev, "[%s] No IRQ defined\n", __func__); | |
2583 | goto failure; | |
2584 | } | |
2585 | ||
2586 | err = d40_dmaengine_init(base, num_reserved_chans); | |
2587 | if (err) | |
2588 | goto failure; | |
2589 | ||
2590 | d40_hw_init(base); | |
2591 | ||
2592 | dev_info(base->dev, "initialized\n"); | |
2593 | return 0; | |
2594 | ||
2595 | failure: | |
2596 | if (base) { | |
c675b1b4 JA |
2597 | if (base->desc_slab) |
2598 | kmem_cache_destroy(base->desc_slab); | |
8d318a50 LW |
2599 | if (base->virtbase) |
2600 | iounmap(base->virtbase); | |
2601 | if (base->lcla_pool.phy) | |
2602 | release_mem_region(base->lcla_pool.phy, | |
2603 | base->lcla_pool.base_size); | |
2604 | if (base->phy_lcpa) | |
2605 | release_mem_region(base->phy_lcpa, | |
2606 | base->lcpa_size); | |
2607 | if (base->phy_start) | |
2608 | release_mem_region(base->phy_start, | |
2609 | base->phy_size); | |
2610 | if (base->clk) { | |
2611 | clk_disable(base->clk); | |
2612 | clk_put(base->clk); | |
2613 | } | |
2614 | ||
2615 | kfree(base->lcla_pool.alloc_map); | |
2616 | kfree(base->lookup_log_chans); | |
2617 | kfree(base->lookup_phy_chans); | |
2618 | kfree(base->phy_res); | |
2619 | kfree(base); | |
2620 | } | |
2621 | ||
2622 | dev_err(&pdev->dev, "[%s] probe failed\n", __func__); | |
2623 | return ret; | |
2624 | } | |
2625 | ||
2626 | static struct platform_driver d40_driver = { | |
2627 | .driver = { | |
2628 | .owner = THIS_MODULE, | |
2629 | .name = D40_NAME, | |
2630 | }, | |
2631 | }; | |
2632 | ||
2633 | int __init stedma40_init(void) | |
2634 | { | |
2635 | return platform_driver_probe(&d40_driver, d40_probe); | |
2636 | } | |
2637 | arch_initcall(stedma40_init); |