DMAENGINE: DMA40 fix for allocation of logical channel 0
[linux-2.6.git] / drivers / dma / ste_dma40.c
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
37 /* The number of free d40_desc to keep in memory before starting
38  * to kfree() them */
39 #define D40_DESC_CACHE_SIZE 50
40
41 /* Hardware designer of the block */
42 #define D40_PERIPHID2_DESIGNER 0x8
43
44 /**
45  * enum 40_command - The different commands and/or statuses.
46  *
47  * @D40_DMA_STOP: DMA channel command STOP or status STOPPED,
48  * @D40_DMA_RUN: The DMA channel is RUNNING of the command RUN.
49  * @D40_DMA_SUSPEND_REQ: Request the DMA to SUSPEND as soon as possible.
50  * @D40_DMA_SUSPENDED: The DMA channel is SUSPENDED.
51  */
52 enum d40_command {
53         D40_DMA_STOP            = 0,
54         D40_DMA_RUN             = 1,
55         D40_DMA_SUSPEND_REQ     = 2,
56         D40_DMA_SUSPENDED       = 3
57 };
58
59 /**
60  * struct d40_lli_pool - Structure for keeping LLIs in memory
61  *
62  * @base: Pointer to memory area when the pre_alloc_lli's are not large
63  * enough, IE bigger than the most common case, 1 dst and 1 src. NULL if
64  * pre_alloc_lli is used.
65  * @size: The size in bytes of the memory at base or the size of pre_alloc_lli.
66  * @pre_alloc_lli: Pre allocated area for the most common case of transfers,
67  * one buffer to one buffer.
68  */
69 struct d40_lli_pool {
70         void    *base;
71         int     size;
72         /* Space for dst and src, plus an extra for padding */
73         u8      pre_alloc_lli[3 * sizeof(struct d40_phy_lli)];
74 };
75
76 /**
77  * struct d40_desc - A descriptor is one DMA job.
78  *
79  * @lli_phy: LLI settings for physical channel. Both src and dst=
80  * points into the lli_pool, to base if lli_len > 1 or to pre_alloc_lli if
81  * lli_len equals one.
82  * @lli_log: Same as above but for logical channels.
83  * @lli_pool: The pool with two entries pre-allocated.
84  * @lli_len: Number of LLI's in lli_pool
85  * @lli_tcount: Number of LLIs processed in the transfer. When equals lli_len
86  * then this transfer job is done.
87  * @txd: DMA engine struct. Used for among other things for communication
88  * during a transfer.
89  * @node: List entry.
90  * @dir: The transfer direction of this job.
91  * @is_in_client_list: true if the client owns this descriptor.
92  *
93  * This descriptor is used for both logical and physical transfers.
94  */
95
96 struct d40_desc {
97         /* LLI physical */
98         struct d40_phy_lli_bidir         lli_phy;
99         /* LLI logical */
100         struct d40_log_lli_bidir         lli_log;
101
102         struct d40_lli_pool              lli_pool;
103         u32                              lli_len;
104         u32                              lli_tcount;
105
106         struct dma_async_tx_descriptor   txd;
107         struct list_head                 node;
108
109         enum dma_data_direction          dir;
110         bool                             is_in_client_list;
111 };
112
113 /**
114  * struct d40_lcla_pool - LCLA pool settings and data.
115  *
116  * @base: The virtual address of LCLA.
117  * @phy: Physical base address of LCLA.
118  * @base_size: size of lcla.
119  * @lock: Lock to protect the content in this struct.
120  * @alloc_map: Mapping between physical channel and LCLA entries.
121  * @num_blocks: The number of entries of alloc_map. Equals to the
122  * number of physical channels.
123  */
124 struct d40_lcla_pool {
125         void            *base;
126         dma_addr_t       phy;
127         resource_size_t  base_size;
128         spinlock_t       lock;
129         u32             *alloc_map;
130         int              num_blocks;
131 };
132
133 /**
134  * struct d40_phy_res - struct for handling eventlines mapped to physical
135  * channels.
136  *
137  * @lock: A lock protection this entity.
138  * @num: The physical channel number of this entity.
139  * @allocated_src: Bit mapped to show which src event line's are mapped to
140  * this physical channel. Can also be free or physically allocated.
141  * @allocated_dst: Same as for src but is dst.
142  * allocated_dst and allocated_src uses the D40_ALLOC* defines as well as
143  * event line number. Both allocated_src and allocated_dst can not be
144  * allocated to a physical channel, since the interrupt handler has then
145  * no way of figure out which one the interrupt belongs to.
146  */
147 struct d40_phy_res {
148         spinlock_t lock;
149         int        num;
150         u32        allocated_src;
151         u32        allocated_dst;
152 };
153
154 struct d40_base;
155
156 /**
157  * struct d40_chan - Struct that describes a channel.
158  *
159  * @lock: A spinlock to protect this struct.
160  * @log_num: The logical number, if any of this channel.
161  * @completed: Starts with 1, after first interrupt it is set to dma engine's
162  * current cookie.
163  * @pending_tx: The number of pending transfers. Used between interrupt handler
164  * and tasklet.
165  * @busy: Set to true when transfer is ongoing on this channel.
166  * @phy_chan: Pointer to physical channel which this instance runs on.
167  * @chan: DMA engine handle.
168  * @tasklet: Tasklet that gets scheduled from interrupt context to complete a
169  * transfer and call client callback.
170  * @client: Cliented owned descriptor list.
171  * @active: Active descriptor.
172  * @queue: Queued jobs.
173  * @free: List of free descripts, ready to be reused.
174  * @free_len: Number of descriptors in the free list.
175  * @dma_cfg: The client configuration of this dma channel.
176  * @base: Pointer to the device instance struct.
177  * @src_def_cfg: Default cfg register setting for src.
178  * @dst_def_cfg: Default cfg register setting for dst.
179  * @log_def: Default logical channel settings.
180  * @lcla: Space for one dst src pair for logical channel transfers.
181  * @lcpa: Pointer to dst and src lcpa settings.
182  *
183  * This struct can either "be" a logical or a physical channel.
184  */
185 struct d40_chan {
186         spinlock_t                       lock;
187         int                              log_num;
188         /* ID of the most recent completed transfer */
189         int                              completed;
190         int                              pending_tx;
191         bool                             busy;
192         struct d40_phy_res              *phy_chan;
193         struct dma_chan                  chan;
194         struct tasklet_struct            tasklet;
195         struct list_head                 client;
196         struct list_head                 active;
197         struct list_head                 queue;
198         struct list_head                 free;
199         int                              free_len;
200         struct stedma40_chan_cfg         dma_cfg;
201         struct d40_base                 *base;
202         /* Default register configurations */
203         u32                              src_def_cfg;
204         u32                              dst_def_cfg;
205         struct d40_def_lcsp              log_def;
206         struct d40_lcla_elem             lcla;
207         struct d40_log_lli_full         *lcpa;
208 };
209
210 /**
211  * struct d40_base - The big global struct, one for each probe'd instance.
212  *
213  * @interrupt_lock: Lock used to make sure one interrupt is handle a time.
214  * @execmd_lock: Lock for execute command usage since several channels share
215  * the same physical register.
216  * @dev: The device structure.
217  * @virtbase: The virtual base address of the DMA's register.
218  * @clk: Pointer to the DMA clock structure.
219  * @phy_start: Physical memory start of the DMA registers.
220  * @phy_size: Size of the DMA register map.
221  * @irq: The IRQ number.
222  * @num_phy_chans: The number of physical channels. Read from HW. This
223  * is the number of available channels for this driver, not counting "Secure
224  * mode" allocated physical channels.
225  * @num_log_chans: The number of logical channels. Calculated from
226  * num_phy_chans.
227  * @dma_both: dma_device channels that can do both memcpy and slave transfers.
228  * @dma_slave: dma_device channels that can do only do slave transfers.
229  * @dma_memcpy: dma_device channels that can do only do memcpy transfers.
230  * @phy_chans: Room for all possible physical channels in system.
231  * @log_chans: Room for all possible logical channels in system.
232  * @lookup_log_chans: Used to map interrupt number to logical channel. Points
233  * to log_chans entries.
234  * @lookup_phy_chans: Used to map interrupt number to physical channel. Points
235  * to phy_chans entries.
236  * @plat_data: Pointer to provided platform_data which is the driver
237  * configuration.
238  * @phy_res: Vector containing all physical channels.
239  * @lcla_pool: lcla pool settings and data.
240  * @lcpa_base: The virtual mapped address of LCPA.
241  * @phy_lcpa: The physical address of the LCPA.
242  * @lcpa_size: The size of the LCPA area.
243  */
244 struct d40_base {
245         spinlock_t                       interrupt_lock;
246         spinlock_t                       execmd_lock;
247         struct device                    *dev;
248         void __iomem                     *virtbase;
249         struct clk                       *clk;
250         phys_addr_t                       phy_start;
251         resource_size_t                   phy_size;
252         int                               irq;
253         int                               num_phy_chans;
254         int                               num_log_chans;
255         struct dma_device                 dma_both;
256         struct dma_device                 dma_slave;
257         struct dma_device                 dma_memcpy;
258         struct d40_chan                  *phy_chans;
259         struct d40_chan                  *log_chans;
260         struct d40_chan                 **lookup_log_chans;
261         struct d40_chan                 **lookup_phy_chans;
262         struct stedma40_platform_data    *plat_data;
263         /* Physical half channels */
264         struct d40_phy_res               *phy_res;
265         struct d40_lcla_pool              lcla_pool;
266         void                             *lcpa_base;
267         dma_addr_t                        phy_lcpa;
268         resource_size_t                   lcpa_size;
269 };
270
271 /**
272  * struct d40_interrupt_lookup - lookup table for interrupt handler
273  *
274  * @src: Interrupt mask register.
275  * @clr: Interrupt clear register.
276  * @is_error: true if this is an error interrupt.
277  * @offset: start delta in the lookup_log_chans in d40_base. If equals to
278  * D40_PHY_CHAN, the lookup_phy_chans shall be used instead.
279  */
280 struct d40_interrupt_lookup {
281         u32 src;
282         u32 clr;
283         bool is_error;
284         int offset;
285 };
286
287 /**
288  * struct d40_reg_val - simple lookup struct
289  *
290  * @reg: The register.
291  * @val: The value that belongs to the register in reg.
292  */
293 struct d40_reg_val {
294         unsigned int reg;
295         unsigned int val;
296 };
297
298 static int d40_pool_lli_alloc(struct d40_desc *d40d,
299                               int lli_len, bool is_log)
300 {
301         u32 align;
302         void *base;
303
304         if (is_log)
305                 align = sizeof(struct d40_log_lli);
306         else
307                 align = sizeof(struct d40_phy_lli);
308
309         if (lli_len == 1) {
310                 base = d40d->lli_pool.pre_alloc_lli;
311                 d40d->lli_pool.size = sizeof(d40d->lli_pool.pre_alloc_lli);
312                 d40d->lli_pool.base = NULL;
313         } else {
314                 d40d->lli_pool.size = ALIGN(lli_len * 2 * align, align);
315
316                 base = kmalloc(d40d->lli_pool.size + align, GFP_NOWAIT);
317                 d40d->lli_pool.base = base;
318
319                 if (d40d->lli_pool.base == NULL)
320                         return -ENOMEM;
321         }
322
323         if (is_log) {
324                 d40d->lli_log.src = PTR_ALIGN((struct d40_log_lli *) base,
325                                               align);
326                 d40d->lli_log.dst = PTR_ALIGN(d40d->lli_log.src + lli_len,
327                                               align);
328         } else {
329                 d40d->lli_phy.src = PTR_ALIGN((struct d40_phy_lli *)base,
330                                               align);
331                 d40d->lli_phy.dst = PTR_ALIGN(d40d->lli_phy.src + lli_len,
332                                               align);
333
334                 d40d->lli_phy.src_addr = virt_to_phys(d40d->lli_phy.src);
335                 d40d->lli_phy.dst_addr = virt_to_phys(d40d->lli_phy.dst);
336         }
337
338         return 0;
339 }
340
341 static void d40_pool_lli_free(struct d40_desc *d40d)
342 {
343         kfree(d40d->lli_pool.base);
344         d40d->lli_pool.base = NULL;
345         d40d->lli_pool.size = 0;
346         d40d->lli_log.src = NULL;
347         d40d->lli_log.dst = NULL;
348         d40d->lli_phy.src = NULL;
349         d40d->lli_phy.dst = NULL;
350         d40d->lli_phy.src_addr = 0;
351         d40d->lli_phy.dst_addr = 0;
352 }
353
354 static dma_cookie_t d40_assign_cookie(struct d40_chan *d40c,
355                                       struct d40_desc *desc)
356 {
357         dma_cookie_t cookie = d40c->chan.cookie;
358
359         if (++cookie < 0)
360                 cookie = 1;
361
362         d40c->chan.cookie = cookie;
363         desc->txd.cookie = cookie;
364
365         return cookie;
366 }
367
368 static void d40_desc_reset(struct d40_desc *d40d)
369 {
370         d40d->lli_tcount = 0;
371 }
372
373 static void d40_desc_remove(struct d40_desc *d40d)
374 {
375         list_del(&d40d->node);
376 }
377
378 static struct d40_desc *d40_desc_get(struct d40_chan *d40c)
379 {
380         struct d40_desc *desc;
381         struct d40_desc *d;
382         struct d40_desc *_d;
383
384         if (!list_empty(&d40c->client)) {
385                 list_for_each_entry_safe(d, _d, &d40c->client, node)
386                         if (async_tx_test_ack(&d->txd)) {
387                                 d40_pool_lli_free(d);
388                                 d40_desc_remove(d);
389                                 desc = d;
390                                 goto out;
391                         }
392         }
393
394         if (list_empty(&d40c->free)) {
395                 /* Alloc new desc because we're out of used ones */
396                 desc = kzalloc(sizeof(struct d40_desc), GFP_NOWAIT);
397                 if (desc == NULL)
398                         goto out;
399                 INIT_LIST_HEAD(&desc->node);
400         } else {
401                 /* Reuse an old desc. */
402                 desc = list_first_entry(&d40c->free,
403                                         struct d40_desc,
404                                         node);
405                 list_del(&desc->node);
406                 d40c->free_len--;
407         }
408 out:
409         return desc;
410 }
411
412 static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d)
413 {
414         if (d40c->free_len < D40_DESC_CACHE_SIZE) {
415                 list_add_tail(&d40d->node, &d40c->free);
416                 d40c->free_len++;
417         } else
418                 kfree(d40d);
419 }
420
421 static void d40_desc_submit(struct d40_chan *d40c, struct d40_desc *desc)
422 {
423         list_add_tail(&desc->node, &d40c->active);
424 }
425
426 static struct d40_desc *d40_first_active_get(struct d40_chan *d40c)
427 {
428         struct d40_desc *d;
429
430         if (list_empty(&d40c->active))
431                 return NULL;
432
433         d = list_first_entry(&d40c->active,
434                              struct d40_desc,
435                              node);
436         return d;
437 }
438
439 static void d40_desc_queue(struct d40_chan *d40c, struct d40_desc *desc)
440 {
441         list_add_tail(&desc->node, &d40c->queue);
442 }
443
444 static struct d40_desc *d40_first_queued(struct d40_chan *d40c)
445 {
446         struct d40_desc *d;
447
448         if (list_empty(&d40c->queue))
449                 return NULL;
450
451         d = list_first_entry(&d40c->queue,
452                              struct d40_desc,
453                              node);
454         return d;
455 }
456
457 /* Support functions for logical channels */
458
459 static int d40_lcla_id_get(struct d40_chan *d40c,
460                            struct d40_lcla_pool *pool)
461 {
462         int src_id = 0;
463         int dst_id = 0;
464         struct d40_log_lli *lcla_lidx_base =
465                 pool->base + d40c->phy_chan->num * 1024;
466         int i;
467         int lli_per_log = d40c->base->plat_data->llis_per_log;
468
469         if (d40c->lcla.src_id >= 0 && d40c->lcla.dst_id >= 0)
470                 return 0;
471
472         if (pool->num_blocks > 32)
473                 return -EINVAL;
474
475         spin_lock(&pool->lock);
476
477         for (i = 0; i < pool->num_blocks; i++) {
478                 if (!(pool->alloc_map[d40c->phy_chan->num] & (0x1 << i))) {
479                         pool->alloc_map[d40c->phy_chan->num] |= (0x1 << i);
480                         break;
481                 }
482         }
483         src_id = i;
484         if (src_id >= pool->num_blocks)
485                 goto err;
486
487         for (; i < pool->num_blocks; i++) {
488                 if (!(pool->alloc_map[d40c->phy_chan->num] & (0x1 << i))) {
489                         pool->alloc_map[d40c->phy_chan->num] |= (0x1 << i);
490                         break;
491                 }
492         }
493
494         dst_id = i;
495         if (dst_id == src_id)
496                 goto err;
497
498         d40c->lcla.src_id = src_id;
499         d40c->lcla.dst_id = dst_id;
500         d40c->lcla.dst = lcla_lidx_base + dst_id * lli_per_log + 1;
501         d40c->lcla.src = lcla_lidx_base + src_id * lli_per_log + 1;
502
503
504         spin_unlock(&pool->lock);
505         return 0;
506 err:
507         spin_unlock(&pool->lock);
508         return -EINVAL;
509 }
510
511 static void d40_lcla_id_put(struct d40_chan *d40c,
512                             struct d40_lcla_pool *pool,
513                             int id)
514 {
515         if (id < 0)
516                 return;
517
518         d40c->lcla.src_id = -1;
519         d40c->lcla.dst_id = -1;
520
521         spin_lock(&pool->lock);
522         pool->alloc_map[d40c->phy_chan->num] &= (~(0x1 << id));
523         spin_unlock(&pool->lock);
524 }
525
526 static int d40_channel_execute_command(struct d40_chan *d40c,
527                                        enum d40_command command)
528 {
529         int status, i;
530         void __iomem *active_reg;
531         int ret = 0;
532         unsigned long flags;
533
534         spin_lock_irqsave(&d40c->base->execmd_lock, flags);
535
536         if (d40c->phy_chan->num % 2 == 0)
537                 active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
538         else
539                 active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
540
541         if (command == D40_DMA_SUSPEND_REQ) {
542                 status = (readl(active_reg) &
543                           D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
544                         D40_CHAN_POS(d40c->phy_chan->num);
545
546                 if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
547                         goto done;
548         }
549
550         writel(command << D40_CHAN_POS(d40c->phy_chan->num), active_reg);
551
552         if (command == D40_DMA_SUSPEND_REQ) {
553
554                 for (i = 0 ; i < D40_SUSPEND_MAX_IT; i++) {
555                         status = (readl(active_reg) &
556                                   D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
557                                 D40_CHAN_POS(d40c->phy_chan->num);
558
559                         cpu_relax();
560                         /*
561                          * Reduce the number of bus accesses while
562                          * waiting for the DMA to suspend.
563                          */
564                         udelay(3);
565
566                         if (status == D40_DMA_STOP ||
567                             status == D40_DMA_SUSPENDED)
568                                 break;
569                 }
570
571                 if (i == D40_SUSPEND_MAX_IT) {
572                         dev_err(&d40c->chan.dev->device,
573                                 "[%s]: unable to suspend the chl %d (log: %d) status %x\n",
574                                 __func__, d40c->phy_chan->num, d40c->log_num,
575                                 status);
576                         dump_stack();
577                         ret = -EBUSY;
578                 }
579
580         }
581 done:
582         spin_unlock_irqrestore(&d40c->base->execmd_lock, flags);
583         return ret;
584 }
585
586 static void d40_term_all(struct d40_chan *d40c)
587 {
588         struct d40_desc *d40d;
589         struct d40_desc *d;
590         struct d40_desc *_d;
591
592         /* Release active descriptors */
593         while ((d40d = d40_first_active_get(d40c))) {
594                 d40_desc_remove(d40d);
595
596                 /* Return desc to free-list */
597                 d40_desc_free(d40c, d40d);
598         }
599
600         /* Release queued descriptors waiting for transfer */
601         while ((d40d = d40_first_queued(d40c))) {
602                 d40_desc_remove(d40d);
603
604                 /* Return desc to free-list */
605                 d40_desc_free(d40c, d40d);
606         }
607
608         /* Release client owned descriptors */
609         if (!list_empty(&d40c->client))
610                 list_for_each_entry_safe(d, _d, &d40c->client, node) {
611                         d40_pool_lli_free(d);
612                         d40_desc_remove(d);
613                         /* Return desc to free-list */
614                         d40_desc_free(d40c, d40d);
615                 }
616
617         d40_lcla_id_put(d40c, &d40c->base->lcla_pool,
618                         d40c->lcla.src_id);
619         d40_lcla_id_put(d40c, &d40c->base->lcla_pool,
620                         d40c->lcla.dst_id);
621
622         d40c->pending_tx = 0;
623         d40c->busy = false;
624 }
625
626 static void d40_config_set_event(struct d40_chan *d40c, bool do_enable)
627 {
628         u32 val;
629         unsigned long flags;
630
631         if (do_enable)
632                 val = D40_ACTIVATE_EVENTLINE;
633         else
634                 val = D40_DEACTIVATE_EVENTLINE;
635
636         spin_lock_irqsave(&d40c->phy_chan->lock, flags);
637
638         /* Enable event line connected to device (or memcpy) */
639         if ((d40c->dma_cfg.dir ==  STEDMA40_PERIPH_TO_MEM) ||
640             (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH)) {
641                 u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type);
642
643                 writel((val << D40_EVENTLINE_POS(event)) |
644                        ~D40_EVENTLINE_MASK(event),
645                        d40c->base->virtbase + D40_DREG_PCBASE +
646                        d40c->phy_chan->num * D40_DREG_PCDELTA +
647                        D40_CHAN_REG_SSLNK);
648         }
649         if (d40c->dma_cfg.dir !=  STEDMA40_PERIPH_TO_MEM) {
650                 u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
651
652                 writel((val << D40_EVENTLINE_POS(event)) |
653                        ~D40_EVENTLINE_MASK(event),
654                        d40c->base->virtbase + D40_DREG_PCBASE +
655                        d40c->phy_chan->num * D40_DREG_PCDELTA +
656                        D40_CHAN_REG_SDLNK);
657         }
658
659         spin_unlock_irqrestore(&d40c->phy_chan->lock, flags);
660 }
661
662 static u32 d40_chan_has_events(struct d40_chan *d40c)
663 {
664         u32 val = 0;
665
666         /* If SSLNK or SDLNK is zero all events are disabled */
667         if ((d40c->dma_cfg.dir ==  STEDMA40_PERIPH_TO_MEM) ||
668             (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH))
669                 val = readl(d40c->base->virtbase + D40_DREG_PCBASE +
670                             d40c->phy_chan->num * D40_DREG_PCDELTA +
671                             D40_CHAN_REG_SSLNK);
672
673         if (d40c->dma_cfg.dir !=  STEDMA40_PERIPH_TO_MEM)
674                 val = readl(d40c->base->virtbase + D40_DREG_PCBASE +
675                             d40c->phy_chan->num * D40_DREG_PCDELTA +
676                             D40_CHAN_REG_SDLNK);
677         return val;
678 }
679
680 static void d40_config_enable_lidx(struct d40_chan *d40c)
681 {
682         /* Set LIDX for lcla */
683         writel((d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS) &
684                D40_SREG_ELEM_LOG_LIDX_MASK,
685                d40c->base->virtbase + D40_DREG_PCBASE +
686                d40c->phy_chan->num * D40_DREG_PCDELTA + D40_CHAN_REG_SDELT);
687
688         writel((d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS) &
689                D40_SREG_ELEM_LOG_LIDX_MASK,
690                d40c->base->virtbase + D40_DREG_PCBASE +
691                d40c->phy_chan->num * D40_DREG_PCDELTA + D40_CHAN_REG_SSELT);
692 }
693
694 static int d40_config_write(struct d40_chan *d40c)
695 {
696         u32 addr_base;
697         u32 var;
698         int res;
699
700         res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
701         if (res)
702                 return res;
703
704         /* Odd addresses are even addresses + 4 */
705         addr_base = (d40c->phy_chan->num % 2) * 4;
706         /* Setup channel mode to logical or physical */
707         var = ((u32)(d40c->log_num != D40_PHY_CHAN) + 1) <<
708                 D40_CHAN_POS(d40c->phy_chan->num);
709         writel(var, d40c->base->virtbase + D40_DREG_PRMSE + addr_base);
710
711         /* Setup operational mode option register */
712         var = ((d40c->dma_cfg.channel_type >> STEDMA40_INFO_CH_MODE_OPT_POS) &
713                0x3) << D40_CHAN_POS(d40c->phy_chan->num);
714
715         writel(var, d40c->base->virtbase + D40_DREG_PRMOE + addr_base);
716
717         if (d40c->log_num != D40_PHY_CHAN) {
718                 /* Set default config for CFG reg */
719                 writel(d40c->src_def_cfg,
720                        d40c->base->virtbase + D40_DREG_PCBASE +
721                        d40c->phy_chan->num * D40_DREG_PCDELTA +
722                        D40_CHAN_REG_SSCFG);
723                 writel(d40c->dst_def_cfg,
724                        d40c->base->virtbase + D40_DREG_PCBASE +
725                        d40c->phy_chan->num * D40_DREG_PCDELTA +
726                        D40_CHAN_REG_SDCFG);
727
728                 d40_config_enable_lidx(d40c);
729         }
730         return res;
731 }
732
733 static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d)
734 {
735
736         if (d40d->lli_phy.dst && d40d->lli_phy.src) {
737                 d40_phy_lli_write(d40c->base->virtbase,
738                                   d40c->phy_chan->num,
739                                   d40d->lli_phy.dst,
740                                   d40d->lli_phy.src);
741                 d40d->lli_tcount = d40d->lli_len;
742         } else if (d40d->lli_log.dst && d40d->lli_log.src) {
743                 u32 lli_len;
744                 struct d40_log_lli *src = d40d->lli_log.src;
745                 struct d40_log_lli *dst = d40d->lli_log.dst;
746
747                 src += d40d->lli_tcount;
748                 dst += d40d->lli_tcount;
749
750                 if (d40d->lli_len <= d40c->base->plat_data->llis_per_log)
751                         lli_len = d40d->lli_len;
752                 else
753                         lli_len = d40c->base->plat_data->llis_per_log;
754                 d40d->lli_tcount += lli_len;
755                 d40_log_lli_write(d40c->lcpa, d40c->lcla.src,
756                                   d40c->lcla.dst,
757                                   dst, src,
758                                   d40c->base->plat_data->llis_per_log);
759         }
760 }
761
762 static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
763 {
764         struct d40_chan *d40c = container_of(tx->chan,
765                                              struct d40_chan,
766                                              chan);
767         struct d40_desc *d40d = container_of(tx, struct d40_desc, txd);
768         unsigned long flags;
769
770         spin_lock_irqsave(&d40c->lock, flags);
771
772         tx->cookie = d40_assign_cookie(d40c, d40d);
773
774         d40_desc_queue(d40c, d40d);
775
776         spin_unlock_irqrestore(&d40c->lock, flags);
777
778         return tx->cookie;
779 }
780
781 static int d40_start(struct d40_chan *d40c)
782 {
783         int err;
784
785         if (d40c->log_num != D40_PHY_CHAN) {
786                 err = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
787                 if (err)
788                         return err;
789                 d40_config_set_event(d40c, true);
790         }
791
792         err = d40_channel_execute_command(d40c, D40_DMA_RUN);
793
794         return err;
795 }
796
797 static struct d40_desc *d40_queue_start(struct d40_chan *d40c)
798 {
799         struct d40_desc *d40d;
800         int err;
801
802         /* Start queued jobs, if any */
803         d40d = d40_first_queued(d40c);
804
805         if (d40d != NULL) {
806                 d40c->busy = true;
807
808                 /* Remove from queue */
809                 d40_desc_remove(d40d);
810
811                 /* Add to active queue */
812                 d40_desc_submit(d40c, d40d);
813
814                 /* Initiate DMA job */
815                 d40_desc_load(d40c, d40d);
816
817                 /* Start dma job */
818                 err = d40_start(d40c);
819
820                 if (err)
821                         return NULL;
822         }
823
824         return d40d;
825 }
826
827 /* called from interrupt context */
828 static void dma_tc_handle(struct d40_chan *d40c)
829 {
830         struct d40_desc *d40d;
831
832         if (!d40c->phy_chan)
833                 return;
834
835         /* Get first active entry from list */
836         d40d = d40_first_active_get(d40c);
837
838         if (d40d == NULL)
839                 return;
840
841         if (d40d->lli_tcount < d40d->lli_len) {
842
843                 d40_desc_load(d40c, d40d);
844                 /* Start dma job */
845                 (void) d40_start(d40c);
846                 return;
847         }
848
849         if (d40_queue_start(d40c) == NULL)
850                 d40c->busy = false;
851
852         d40c->pending_tx++;
853         tasklet_schedule(&d40c->tasklet);
854
855 }
856
857 static void dma_tasklet(unsigned long data)
858 {
859         struct d40_chan *d40c = (struct d40_chan *) data;
860         struct d40_desc *d40d_fin;
861         unsigned long flags;
862         dma_async_tx_callback callback;
863         void *callback_param;
864
865         spin_lock_irqsave(&d40c->lock, flags);
866
867         /* Get first active entry from list */
868         d40d_fin = d40_first_active_get(d40c);
869
870         if (d40d_fin == NULL)
871                 goto err;
872
873         d40c->completed = d40d_fin->txd.cookie;
874
875         /*
876          * If terminating a channel pending_tx is set to zero.
877          * This prevents any finished active jobs to return to the client.
878          */
879         if (d40c->pending_tx == 0) {
880                 spin_unlock_irqrestore(&d40c->lock, flags);
881                 return;
882         }
883
884         /* Callback to client */
885         callback = d40d_fin->txd.callback;
886         callback_param = d40d_fin->txd.callback_param;
887
888         if (async_tx_test_ack(&d40d_fin->txd)) {
889                 d40_pool_lli_free(d40d_fin);
890                 d40_desc_remove(d40d_fin);
891                 /* Return desc to free-list */
892                 d40_desc_free(d40c, d40d_fin);
893         } else {
894                 d40_desc_reset(d40d_fin);
895                 if (!d40d_fin->is_in_client_list) {
896                         d40_desc_remove(d40d_fin);
897                         list_add_tail(&d40d_fin->node, &d40c->client);
898                         d40d_fin->is_in_client_list = true;
899                 }
900         }
901
902         d40c->pending_tx--;
903
904         if (d40c->pending_tx)
905                 tasklet_schedule(&d40c->tasklet);
906
907         spin_unlock_irqrestore(&d40c->lock, flags);
908
909         if (callback)
910                 callback(callback_param);
911
912         return;
913
914  err:
915         /* Rescue manouver if receiving double interrupts */
916         if (d40c->pending_tx > 0)
917                 d40c->pending_tx--;
918         spin_unlock_irqrestore(&d40c->lock, flags);
919 }
920
921 static irqreturn_t d40_handle_interrupt(int irq, void *data)
922 {
923         static const struct d40_interrupt_lookup il[] = {
924                 {D40_DREG_LCTIS0, D40_DREG_LCICR0, false,  0},
925                 {D40_DREG_LCTIS1, D40_DREG_LCICR1, false, 32},
926                 {D40_DREG_LCTIS2, D40_DREG_LCICR2, false, 64},
927                 {D40_DREG_LCTIS3, D40_DREG_LCICR3, false, 96},
928                 {D40_DREG_LCEIS0, D40_DREG_LCICR0, true,   0},
929                 {D40_DREG_LCEIS1, D40_DREG_LCICR1, true,  32},
930                 {D40_DREG_LCEIS2, D40_DREG_LCICR2, true,  64},
931                 {D40_DREG_LCEIS3, D40_DREG_LCICR3, true,  96},
932                 {D40_DREG_PCTIS,  D40_DREG_PCICR,  false, D40_PHY_CHAN},
933                 {D40_DREG_PCEIS,  D40_DREG_PCICR,  true,  D40_PHY_CHAN},
934         };
935
936         int i;
937         u32 regs[ARRAY_SIZE(il)];
938         u32 tmp;
939         u32 idx;
940         u32 row;
941         long chan = -1;
942         struct d40_chan *d40c;
943         unsigned long flags;
944         struct d40_base *base = data;
945
946         spin_lock_irqsave(&base->interrupt_lock, flags);
947
948         /* Read interrupt status of both logical and physical channels */
949         for (i = 0; i < ARRAY_SIZE(il); i++)
950                 regs[i] = readl(base->virtbase + il[i].src);
951
952         for (;;) {
953
954                 chan = find_next_bit((unsigned long *)regs,
955                                      BITS_PER_LONG * ARRAY_SIZE(il), chan + 1);
956
957                 /* No more set bits found? */
958                 if (chan == BITS_PER_LONG * ARRAY_SIZE(il))
959                         break;
960
961                 row = chan / BITS_PER_LONG;
962                 idx = chan & (BITS_PER_LONG - 1);
963
964                 /* ACK interrupt */
965                 tmp = readl(base->virtbase + il[row].clr);
966                 tmp |= 1 << idx;
967                 writel(tmp, base->virtbase + il[row].clr);
968
969                 if (il[row].offset == D40_PHY_CHAN)
970                         d40c = base->lookup_phy_chans[idx];
971                 else
972                         d40c = base->lookup_log_chans[il[row].offset + idx];
973                 spin_lock(&d40c->lock);
974
975                 if (!il[row].is_error)
976                         dma_tc_handle(d40c);
977                 else
978                         dev_err(base->dev, "[%s] IRQ chan: %ld offset %d idx %d\n",
979                                 __func__, chan, il[row].offset, idx);
980
981                 spin_unlock(&d40c->lock);
982         }
983
984         spin_unlock_irqrestore(&base->interrupt_lock, flags);
985
986         return IRQ_HANDLED;
987 }
988
989
990 static int d40_validate_conf(struct d40_chan *d40c,
991                              struct stedma40_chan_cfg *conf)
992 {
993         int res = 0;
994         u32 dst_event_group = D40_TYPE_TO_GROUP(conf->dst_dev_type);
995         u32 src_event_group = D40_TYPE_TO_GROUP(conf->src_dev_type);
996         bool is_log = (conf->channel_type & STEDMA40_CHANNEL_IN_OPER_MODE)
997                 == STEDMA40_CHANNEL_IN_LOG_MODE;
998
999         if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH &&
1000             dst_event_group == STEDMA40_DEV_DST_MEMORY) {
1001                 dev_err(&d40c->chan.dev->device, "[%s] Invalid dst\n",
1002                         __func__);
1003                 res = -EINVAL;
1004         }
1005
1006         if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM &&
1007             src_event_group == STEDMA40_DEV_SRC_MEMORY) {
1008                 dev_err(&d40c->chan.dev->device, "[%s] Invalid src\n",
1009                         __func__);
1010                 res = -EINVAL;
1011         }
1012
1013         if (src_event_group == STEDMA40_DEV_SRC_MEMORY &&
1014             dst_event_group == STEDMA40_DEV_DST_MEMORY && is_log) {
1015                 dev_err(&d40c->chan.dev->device,
1016                         "[%s] No event line\n", __func__);
1017                 res = -EINVAL;
1018         }
1019
1020         if (conf->dir == STEDMA40_PERIPH_TO_PERIPH &&
1021             (src_event_group != dst_event_group)) {
1022                 dev_err(&d40c->chan.dev->device,
1023                         "[%s] Invalid event group\n", __func__);
1024                 res = -EINVAL;
1025         }
1026
1027         if (conf->dir == STEDMA40_PERIPH_TO_PERIPH) {
1028                 /*
1029                  * DMAC HW supports it. Will be added to this driver,
1030                  * in case any dma client requires it.
1031                  */
1032                 dev_err(&d40c->chan.dev->device,
1033                         "[%s] periph to periph not supported\n",
1034                         __func__);
1035                 res = -EINVAL;
1036         }
1037
1038         return res;
1039 }
1040
1041 static bool d40_alloc_mask_set(struct d40_phy_res *phy, bool is_src,
1042                                int log_event_line, bool is_log)
1043 {
1044         unsigned long flags;
1045         spin_lock_irqsave(&phy->lock, flags);
1046         if (!is_log) {
1047                 /* Physical interrupts are masked per physical full channel */
1048                 if (phy->allocated_src == D40_ALLOC_FREE &&
1049                     phy->allocated_dst == D40_ALLOC_FREE) {
1050                         phy->allocated_dst = D40_ALLOC_PHY;
1051                         phy->allocated_src = D40_ALLOC_PHY;
1052                         goto found;
1053                 } else
1054                         goto not_found;
1055         }
1056
1057         /* Logical channel */
1058         if (is_src) {
1059                 if (phy->allocated_src == D40_ALLOC_PHY)
1060                         goto not_found;
1061
1062                 if (phy->allocated_src == D40_ALLOC_FREE)
1063                         phy->allocated_src = D40_ALLOC_LOG_FREE;
1064
1065                 if (!(phy->allocated_src & (1 << log_event_line))) {
1066                         phy->allocated_src |= 1 << log_event_line;
1067                         goto found;
1068                 } else
1069                         goto not_found;
1070         } else {
1071                 if (phy->allocated_dst == D40_ALLOC_PHY)
1072                         goto not_found;
1073
1074                 if (phy->allocated_dst == D40_ALLOC_FREE)
1075                         phy->allocated_dst = D40_ALLOC_LOG_FREE;
1076
1077                 if (!(phy->allocated_dst & (1 << log_event_line))) {
1078                         phy->allocated_dst |= 1 << log_event_line;
1079                         goto found;
1080                 } else
1081                         goto not_found;
1082         }
1083
1084 not_found:
1085         spin_unlock_irqrestore(&phy->lock, flags);
1086         return false;
1087 found:
1088         spin_unlock_irqrestore(&phy->lock, flags);
1089         return true;
1090 }
1091
1092 static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src,
1093                                int log_event_line)
1094 {
1095         unsigned long flags;
1096         bool is_free = false;
1097
1098         spin_lock_irqsave(&phy->lock, flags);
1099         if (!log_event_line) {
1100                 /* Physical interrupts are masked per physical full channel */
1101                 phy->allocated_dst = D40_ALLOC_FREE;
1102                 phy->allocated_src = D40_ALLOC_FREE;
1103                 is_free = true;
1104                 goto out;
1105         }
1106
1107         /* Logical channel */
1108         if (is_src) {
1109                 phy->allocated_src &= ~(1 << log_event_line);
1110                 if (phy->allocated_src == D40_ALLOC_LOG_FREE)
1111                         phy->allocated_src = D40_ALLOC_FREE;
1112         } else {
1113                 phy->allocated_dst &= ~(1 << log_event_line);
1114                 if (phy->allocated_dst == D40_ALLOC_LOG_FREE)
1115                         phy->allocated_dst = D40_ALLOC_FREE;
1116         }
1117
1118         is_free = ((phy->allocated_src | phy->allocated_dst) ==
1119                    D40_ALLOC_FREE);
1120
1121 out:
1122         spin_unlock_irqrestore(&phy->lock, flags);
1123
1124         return is_free;
1125 }
1126
1127 static int d40_allocate_channel(struct d40_chan *d40c)
1128 {
1129         int dev_type;
1130         int event_group;
1131         int event_line;
1132         struct d40_phy_res *phys;
1133         int i;
1134         int j;
1135         int log_num;
1136         bool is_src;
1137         bool is_log = (d40c->dma_cfg.channel_type & STEDMA40_CHANNEL_IN_OPER_MODE)
1138                 == STEDMA40_CHANNEL_IN_LOG_MODE;
1139
1140
1141         phys = d40c->base->phy_res;
1142
1143         if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
1144                 dev_type = d40c->dma_cfg.src_dev_type;
1145                 log_num = 2 * dev_type;
1146                 is_src = true;
1147         } else if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
1148                    d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
1149                 /* dst event lines are used for logical memcpy */
1150                 dev_type = d40c->dma_cfg.dst_dev_type;
1151                 log_num = 2 * dev_type + 1;
1152                 is_src = false;
1153         } else
1154                 return -EINVAL;
1155
1156         event_group = D40_TYPE_TO_GROUP(dev_type);
1157         event_line = D40_TYPE_TO_EVENT(dev_type);
1158
1159         if (!is_log) {
1160                 if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
1161                         /* Find physical half channel */
1162                         for (i = 0; i < d40c->base->num_phy_chans; i++) {
1163
1164                                 if (d40_alloc_mask_set(&phys[i], is_src,
1165                                                        0, is_log))
1166                                         goto found_phy;
1167                         }
1168                 } else
1169                         for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
1170                                 int phy_num = j  + event_group * 2;
1171                                 for (i = phy_num; i < phy_num + 2; i++) {
1172                                         if (d40_alloc_mask_set(&phys[i], is_src,
1173                                                                0, is_log))
1174                                                 goto found_phy;
1175                                 }
1176                         }
1177                 return -EINVAL;
1178 found_phy:
1179                 d40c->phy_chan = &phys[i];
1180                 d40c->log_num = D40_PHY_CHAN;
1181                 goto out;
1182         }
1183         if (dev_type == -1)
1184                 return -EINVAL;
1185
1186         /* Find logical channel */
1187         for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
1188                 int phy_num = j + event_group * 2;
1189                 /*
1190                  * Spread logical channels across all available physical rather
1191                  * than pack every logical channel at the first available phy
1192                  * channels.
1193                  */
1194                 if (is_src) {
1195                         for (i = phy_num; i < phy_num + 2; i++) {
1196                                 if (d40_alloc_mask_set(&phys[i], is_src,
1197                                                        event_line, is_log))
1198                                         goto found_log;
1199                         }
1200                 } else {
1201                         for (i = phy_num + 1; i >= phy_num; i--) {
1202                                 if (d40_alloc_mask_set(&phys[i], is_src,
1203                                                        event_line, is_log))
1204                                         goto found_log;
1205                         }
1206                 }
1207         }
1208         return -EINVAL;
1209
1210 found_log:
1211         d40c->phy_chan = &phys[i];
1212         d40c->log_num = log_num;
1213 out:
1214
1215         if (is_log)
1216                 d40c->base->lookup_log_chans[d40c->log_num] = d40c;
1217         else
1218                 d40c->base->lookup_phy_chans[d40c->phy_chan->num] = d40c;
1219
1220         return 0;
1221
1222 }
1223
1224 static int d40_config_chan(struct d40_chan *d40c,
1225                            struct stedma40_chan_cfg *info)
1226 {
1227
1228         /* Fill in basic CFG register values */
1229         d40_phy_cfg(&d40c->dma_cfg, &d40c->src_def_cfg,
1230                     &d40c->dst_def_cfg, d40c->log_num != D40_PHY_CHAN);
1231
1232         if (d40c->log_num != D40_PHY_CHAN) {
1233                 d40_log_cfg(&d40c->dma_cfg,
1234                             &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
1235
1236                 if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM)
1237                         d40c->lcpa = d40c->base->lcpa_base +
1238                                 d40c->dma_cfg.src_dev_type * 32;
1239                 else
1240                         d40c->lcpa = d40c->base->lcpa_base +
1241                                 d40c->dma_cfg.dst_dev_type * 32 + 16;
1242         }
1243
1244         /* Write channel configuration to the DMA */
1245         return d40_config_write(d40c);
1246 }
1247
1248 static int d40_config_memcpy(struct d40_chan *d40c)
1249 {
1250         dma_cap_mask_t cap = d40c->chan.device->cap_mask;
1251
1252         if (dma_has_cap(DMA_MEMCPY, cap) && !dma_has_cap(DMA_SLAVE, cap)) {
1253                 d40c->dma_cfg = *d40c->base->plat_data->memcpy_conf_log;
1254                 d40c->dma_cfg.src_dev_type = STEDMA40_DEV_SRC_MEMORY;
1255                 d40c->dma_cfg.dst_dev_type = d40c->base->plat_data->
1256                         memcpy[d40c->chan.chan_id];
1257
1258         } else if (dma_has_cap(DMA_MEMCPY, cap) &&
1259                    dma_has_cap(DMA_SLAVE, cap)) {
1260                 d40c->dma_cfg = *d40c->base->plat_data->memcpy_conf_phy;
1261         } else {
1262                 dev_err(&d40c->chan.dev->device, "[%s] No memcpy\n",
1263                         __func__);
1264                 return -EINVAL;
1265         }
1266
1267         return 0;
1268 }
1269
1270
1271 static int d40_free_dma(struct d40_chan *d40c)
1272 {
1273
1274         int res = 0;
1275         u32 event, dir;
1276         struct d40_phy_res *phy = d40c->phy_chan;
1277         bool is_src;
1278
1279         /* Terminate all queued and active transfers */
1280         d40_term_all(d40c);
1281
1282         if (phy == NULL) {
1283                 dev_err(&d40c->chan.dev->device, "[%s] phy == null\n",
1284                         __func__);
1285                 return -EINVAL;
1286         }
1287
1288         if (phy->allocated_src == D40_ALLOC_FREE &&
1289             phy->allocated_dst == D40_ALLOC_FREE) {
1290                 dev_err(&d40c->chan.dev->device, "[%s] channel already free\n",
1291                         __func__);
1292                 return -EINVAL;
1293         }
1294
1295
1296         res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
1297         if (res) {
1298                 dev_err(&d40c->chan.dev->device, "[%s] suspend\n",
1299                         __func__);
1300                 return res;
1301         }
1302
1303         if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
1304             d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
1305                 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
1306                 dir = D40_CHAN_REG_SDLNK;
1307                 is_src = false;
1308         } else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
1309                 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type);
1310                 dir = D40_CHAN_REG_SSLNK;
1311                 is_src = true;
1312         } else {
1313                 dev_err(&d40c->chan.dev->device,
1314                         "[%s] Unknown direction\n", __func__);
1315                 return -EINVAL;
1316         }
1317
1318         if (d40c->log_num != D40_PHY_CHAN) {
1319                 /*
1320                  * Release logical channel, deactivate the event line during
1321                  * the time physical res is suspended.
1322                  */
1323                 writel((D40_DEACTIVATE_EVENTLINE << D40_EVENTLINE_POS(event)) &
1324                        D40_EVENTLINE_MASK(event),
1325                        d40c->base->virtbase + D40_DREG_PCBASE +
1326                        phy->num * D40_DREG_PCDELTA + dir);
1327
1328                 d40c->base->lookup_log_chans[d40c->log_num] = NULL;
1329
1330                 /*
1331                  * Check if there are more logical allocation
1332                  * on this phy channel.
1333                  */
1334                 if (!d40_alloc_mask_free(phy, is_src, event)) {
1335                         /* Resume the other logical channels if any */
1336                         if (d40_chan_has_events(d40c)) {
1337                                 res = d40_channel_execute_command(d40c,
1338                                                                   D40_DMA_RUN);
1339                                 if (res) {
1340                                         dev_err(&d40c->chan.dev->device,
1341                                                 "[%s] Executing RUN command\n",
1342                                                 __func__);
1343                                         return res;
1344                                 }
1345                         }
1346                         return 0;
1347                 }
1348         } else
1349                 d40_alloc_mask_free(phy, is_src, 0);
1350
1351         /* Release physical channel */
1352         res = d40_channel_execute_command(d40c, D40_DMA_STOP);
1353         if (res) {
1354                 dev_err(&d40c->chan.dev->device,
1355                         "[%s] Failed to stop channel\n", __func__);
1356                 return res;
1357         }
1358         d40c->phy_chan = NULL;
1359         /* Invalidate channel type */
1360         d40c->dma_cfg.channel_type = 0;
1361         d40c->base->lookup_phy_chans[phy->num] = NULL;
1362
1363         return 0;
1364
1365
1366 }
1367
1368 static int d40_pause(struct dma_chan *chan)
1369 {
1370         struct d40_chan *d40c =
1371                 container_of(chan, struct d40_chan, chan);
1372         int res;
1373
1374         unsigned long flags;
1375
1376         spin_lock_irqsave(&d40c->lock, flags);
1377
1378         res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
1379         if (res == 0) {
1380                 if (d40c->log_num != D40_PHY_CHAN) {
1381                         d40_config_set_event(d40c, false);
1382                         /* Resume the other logical channels if any */
1383                         if (d40_chan_has_events(d40c))
1384                                 res = d40_channel_execute_command(d40c,
1385                                                                   D40_DMA_RUN);
1386                 }
1387         }
1388
1389         spin_unlock_irqrestore(&d40c->lock, flags);
1390         return res;
1391 }
1392
1393 static bool d40_is_paused(struct d40_chan *d40c)
1394 {
1395         bool is_paused = false;
1396         unsigned long flags;
1397         void __iomem *active_reg;
1398         u32 status;
1399         u32 event;
1400         int res;
1401
1402         spin_lock_irqsave(&d40c->lock, flags);
1403
1404         if (d40c->log_num == D40_PHY_CHAN) {
1405                 if (d40c->phy_chan->num % 2 == 0)
1406                         active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
1407                 else
1408                         active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
1409
1410                 status = (readl(active_reg) &
1411                           D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
1412                         D40_CHAN_POS(d40c->phy_chan->num);
1413                 if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
1414                         is_paused = true;
1415
1416                 goto _exit;
1417         }
1418
1419         res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
1420         if (res != 0)
1421                 goto _exit;
1422
1423         if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
1424             d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM)
1425                 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
1426         else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM)
1427                 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type);
1428         else {
1429                 dev_err(&d40c->chan.dev->device,
1430                         "[%s] Unknown direction\n", __func__);
1431                 goto _exit;
1432         }
1433         status = d40_chan_has_events(d40c);
1434         status = (status & D40_EVENTLINE_MASK(event)) >>
1435                 D40_EVENTLINE_POS(event);
1436
1437         if (status != D40_DMA_RUN)
1438                 is_paused = true;
1439
1440         /* Resume the other logical channels if any */
1441         if (d40_chan_has_events(d40c))
1442                 res = d40_channel_execute_command(d40c,
1443                                                   D40_DMA_RUN);
1444
1445 _exit:
1446         spin_unlock_irqrestore(&d40c->lock, flags);
1447         return is_paused;
1448
1449 }
1450
1451
1452 static bool d40_tx_is_linked(struct d40_chan *d40c)
1453 {
1454         bool is_link;
1455
1456         if (d40c->log_num != D40_PHY_CHAN)
1457                 is_link = readl(&d40c->lcpa->lcsp3) &  D40_MEM_LCSP3_DLOS_MASK;
1458         else
1459                 is_link = readl(d40c->base->virtbase + D40_DREG_PCBASE +
1460                                 d40c->phy_chan->num * D40_DREG_PCDELTA +
1461                                 D40_CHAN_REG_SDLNK) &
1462                         D40_SREG_LNK_PHYS_LNK_MASK;
1463         return is_link;
1464 }
1465
1466 static u32 d40_residue(struct d40_chan *d40c)
1467 {
1468         u32 num_elt;
1469
1470         if (d40c->log_num != D40_PHY_CHAN)
1471                 num_elt = (readl(&d40c->lcpa->lcsp2) &  D40_MEM_LCSP2_ECNT_MASK)
1472                         >> D40_MEM_LCSP2_ECNT_POS;
1473         else
1474                 num_elt = (readl(d40c->base->virtbase + D40_DREG_PCBASE +
1475                                  d40c->phy_chan->num * D40_DREG_PCDELTA +
1476                                  D40_CHAN_REG_SDELT) &
1477                            D40_SREG_ELEM_PHY_ECNT_MASK) >> D40_SREG_ELEM_PHY_ECNT_POS;
1478         return num_elt * (1 << d40c->dma_cfg.dst_info.data_width);
1479 }
1480
1481 static int d40_resume(struct dma_chan *chan)
1482 {
1483         struct d40_chan *d40c =
1484                 container_of(chan, struct d40_chan, chan);
1485         int res = 0;
1486         unsigned long flags;
1487
1488         spin_lock_irqsave(&d40c->lock, flags);
1489
1490         if (d40c->log_num != D40_PHY_CHAN) {
1491                 res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
1492                 if (res)
1493                         goto out;
1494
1495                 /* If bytes left to transfer or linked tx resume job */
1496                 if (d40_residue(d40c) || d40_tx_is_linked(d40c)) {
1497                         d40_config_set_event(d40c, true);
1498                         res = d40_channel_execute_command(d40c, D40_DMA_RUN);
1499                 }
1500         } else if (d40_residue(d40c) || d40_tx_is_linked(d40c))
1501                 res = d40_channel_execute_command(d40c, D40_DMA_RUN);
1502
1503 out:
1504         spin_unlock_irqrestore(&d40c->lock, flags);
1505         return res;
1506 }
1507
1508 static u32 stedma40_residue(struct dma_chan *chan)
1509 {
1510         struct d40_chan *d40c =
1511                 container_of(chan, struct d40_chan, chan);
1512         u32 bytes_left;
1513         unsigned long flags;
1514
1515         spin_lock_irqsave(&d40c->lock, flags);
1516         bytes_left = d40_residue(d40c);
1517         spin_unlock_irqrestore(&d40c->lock, flags);
1518
1519         return bytes_left;
1520 }
1521
1522 /* Public DMA functions in addition to the DMA engine framework */
1523
1524 int stedma40_set_psize(struct dma_chan *chan,
1525                        int src_psize,
1526                        int dst_psize)
1527 {
1528         struct d40_chan *d40c =
1529                 container_of(chan, struct d40_chan, chan);
1530         unsigned long flags;
1531
1532         spin_lock_irqsave(&d40c->lock, flags);
1533
1534         if (d40c->log_num != D40_PHY_CHAN) {
1535                 d40c->log_def.lcsp1 &= ~D40_MEM_LCSP1_SCFG_PSIZE_MASK;
1536                 d40c->log_def.lcsp3 &= ~D40_MEM_LCSP1_SCFG_PSIZE_MASK;
1537                 d40c->log_def.lcsp1 |= src_psize << D40_MEM_LCSP1_SCFG_PSIZE_POS;
1538                 d40c->log_def.lcsp3 |= dst_psize << D40_MEM_LCSP1_SCFG_PSIZE_POS;
1539                 goto out;
1540         }
1541
1542         if (src_psize == STEDMA40_PSIZE_PHY_1)
1543                 d40c->src_def_cfg &= ~(1 << D40_SREG_CFG_PHY_PEN_POS);
1544         else {
1545                 d40c->src_def_cfg |= 1 << D40_SREG_CFG_PHY_PEN_POS;
1546                 d40c->src_def_cfg &= ~(STEDMA40_PSIZE_PHY_16 <<
1547                                        D40_SREG_CFG_PSIZE_POS);
1548                 d40c->src_def_cfg |= src_psize << D40_SREG_CFG_PSIZE_POS;
1549         }
1550
1551         if (dst_psize == STEDMA40_PSIZE_PHY_1)
1552                 d40c->dst_def_cfg &= ~(1 << D40_SREG_CFG_PHY_PEN_POS);
1553         else {
1554                 d40c->dst_def_cfg |= 1 << D40_SREG_CFG_PHY_PEN_POS;
1555                 d40c->dst_def_cfg &= ~(STEDMA40_PSIZE_PHY_16 <<
1556                                        D40_SREG_CFG_PSIZE_POS);
1557                 d40c->dst_def_cfg |= dst_psize << D40_SREG_CFG_PSIZE_POS;
1558         }
1559 out:
1560         spin_unlock_irqrestore(&d40c->lock, flags);
1561         return 0;
1562 }
1563 EXPORT_SYMBOL(stedma40_set_psize);
1564
1565 struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan,
1566                                                    struct scatterlist *sgl_dst,
1567                                                    struct scatterlist *sgl_src,
1568                                                    unsigned int sgl_len,
1569                                                    unsigned long flags)
1570 {
1571         int res;
1572         struct d40_desc *d40d;
1573         struct d40_chan *d40c = container_of(chan, struct d40_chan,
1574                                              chan);
1575         unsigned long flg;
1576         int lli_max = d40c->base->plat_data->llis_per_log;
1577
1578
1579         spin_lock_irqsave(&d40c->lock, flg);
1580         d40d = d40_desc_get(d40c);
1581
1582         if (d40d == NULL)
1583                 goto err;
1584
1585         memset(d40d, 0, sizeof(struct d40_desc));
1586         d40d->lli_len = sgl_len;
1587
1588         d40d->txd.flags = flags;
1589
1590         if (d40c->log_num != D40_PHY_CHAN) {
1591                 if (sgl_len > 1)
1592                         /*
1593                          * Check if there is space available in lcla. If not,
1594                          * split list into 1-length and run only in lcpa
1595                          * space.
1596                          */
1597                         if (d40_lcla_id_get(d40c,
1598                                             &d40c->base->lcla_pool) != 0)
1599                                 lli_max = 1;
1600
1601                 if (d40_pool_lli_alloc(d40d, sgl_len, true) < 0) {
1602                         dev_err(&d40c->chan.dev->device,
1603                                 "[%s] Out of memory\n", __func__);
1604                         goto err;
1605                 }
1606
1607                 (void) d40_log_sg_to_lli(d40c->lcla.src_id,
1608                                          sgl_src,
1609                                          sgl_len,
1610                                          d40d->lli_log.src,
1611                                          d40c->log_def.lcsp1,
1612                                          d40c->dma_cfg.src_info.data_width,
1613                                          flags & DMA_PREP_INTERRUPT, lli_max,
1614                                          d40c->base->plat_data->llis_per_log);
1615
1616                 (void) d40_log_sg_to_lli(d40c->lcla.dst_id,
1617                                          sgl_dst,
1618                                          sgl_len,
1619                                          d40d->lli_log.dst,
1620                                          d40c->log_def.lcsp3,
1621                                          d40c->dma_cfg.dst_info.data_width,
1622                                          flags & DMA_PREP_INTERRUPT, lli_max,
1623                                          d40c->base->plat_data->llis_per_log);
1624
1625
1626         } else {
1627                 if (d40_pool_lli_alloc(d40d, sgl_len, false) < 0) {
1628                         dev_err(&d40c->chan.dev->device,
1629                                 "[%s] Out of memory\n", __func__);
1630                         goto err;
1631                 }
1632
1633                 res = d40_phy_sg_to_lli(sgl_src,
1634                                         sgl_len,
1635                                         0,
1636                                         d40d->lli_phy.src,
1637                                         d40d->lli_phy.src_addr,
1638                                         d40c->src_def_cfg,
1639                                         d40c->dma_cfg.src_info.data_width,
1640                                         d40c->dma_cfg.src_info.psize,
1641                                         true);
1642
1643                 if (res < 0)
1644                         goto err;
1645
1646                 res = d40_phy_sg_to_lli(sgl_dst,
1647                                         sgl_len,
1648                                         0,
1649                                         d40d->lli_phy.dst,
1650                                         d40d->lli_phy.dst_addr,
1651                                         d40c->dst_def_cfg,
1652                                         d40c->dma_cfg.dst_info.data_width,
1653                                         d40c->dma_cfg.dst_info.psize,
1654                                         true);
1655
1656                 if (res < 0)
1657                         goto err;
1658
1659                 (void) dma_map_single(d40c->base->dev, d40d->lli_phy.src,
1660                                       d40d->lli_pool.size, DMA_TO_DEVICE);
1661         }
1662
1663         dma_async_tx_descriptor_init(&d40d->txd, chan);
1664
1665         d40d->txd.tx_submit = d40_tx_submit;
1666
1667         spin_unlock_irqrestore(&d40c->lock, flg);
1668
1669         return &d40d->txd;
1670 err:
1671         spin_unlock_irqrestore(&d40c->lock, flg);
1672         return NULL;
1673 }
1674 EXPORT_SYMBOL(stedma40_memcpy_sg);
1675
1676 bool stedma40_filter(struct dma_chan *chan, void *data)
1677 {
1678         struct stedma40_chan_cfg *info = data;
1679         struct d40_chan *d40c =
1680                 container_of(chan, struct d40_chan, chan);
1681         int err;
1682
1683         if (data) {
1684                 err = d40_validate_conf(d40c, info);
1685                 if (!err)
1686                         d40c->dma_cfg = *info;
1687         } else
1688                 err = d40_config_memcpy(d40c);
1689
1690         return err == 0;
1691 }
1692 EXPORT_SYMBOL(stedma40_filter);
1693
1694 /* DMA ENGINE functions */
1695 static int d40_alloc_chan_resources(struct dma_chan *chan)
1696 {
1697         int err;
1698         unsigned long flags;
1699         struct d40_chan *d40c =
1700                 container_of(chan, struct d40_chan, chan);
1701
1702         spin_lock_irqsave(&d40c->lock, flags);
1703
1704         d40c->completed = chan->cookie = 1;
1705
1706         /*
1707          * If no dma configuration is set (channel_type == 0)
1708          * use default configuration
1709          */
1710         if (d40c->dma_cfg.channel_type == 0) {
1711                 err = d40_config_memcpy(d40c);
1712                 if (err)
1713                         goto err_alloc;
1714         }
1715
1716         err = d40_allocate_channel(d40c);
1717         if (err) {
1718                 dev_err(&d40c->chan.dev->device,
1719                         "[%s] Failed to allocate channel\n", __func__);
1720                 goto err_alloc;
1721         }
1722
1723         err = d40_config_chan(d40c, &d40c->dma_cfg);
1724         if (err) {
1725                 dev_err(&d40c->chan.dev->device,
1726                         "[%s] Failed to configure channel\n",
1727                         __func__);
1728                 goto err_config;
1729         }
1730
1731         spin_unlock_irqrestore(&d40c->lock, flags);
1732         return 0;
1733
1734  err_config:
1735         (void) d40_free_dma(d40c);
1736  err_alloc:
1737         spin_unlock_irqrestore(&d40c->lock, flags);
1738         dev_err(&d40c->chan.dev->device,
1739                 "[%s] Channel allocation failed\n", __func__);
1740         return -EINVAL;
1741 }
1742
1743 static void d40_free_chan_resources(struct dma_chan *chan)
1744 {
1745         struct d40_chan *d40c =
1746                 container_of(chan, struct d40_chan, chan);
1747         int err;
1748         unsigned long flags;
1749
1750         spin_lock_irqsave(&d40c->lock, flags);
1751
1752         err = d40_free_dma(d40c);
1753
1754         if (err)
1755                 dev_err(&d40c->chan.dev->device,
1756                         "[%s] Failed to free channel\n", __func__);
1757         spin_unlock_irqrestore(&d40c->lock, flags);
1758 }
1759
1760 static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
1761                                                        dma_addr_t dst,
1762                                                        dma_addr_t src,
1763                                                        size_t size,
1764                                                        unsigned long flags)
1765 {
1766         struct d40_desc *d40d;
1767         struct d40_chan *d40c = container_of(chan, struct d40_chan,
1768                                              chan);
1769         unsigned long flg;
1770         int err = 0;
1771
1772         spin_lock_irqsave(&d40c->lock, flg);
1773         d40d = d40_desc_get(d40c);
1774
1775         if (d40d == NULL) {
1776                 dev_err(&d40c->chan.dev->device,
1777                         "[%s] Descriptor is NULL\n", __func__);
1778                 goto err;
1779         }
1780
1781         memset(d40d, 0, sizeof(struct d40_desc));
1782
1783         d40d->txd.flags = flags;
1784
1785         dma_async_tx_descriptor_init(&d40d->txd, chan);
1786
1787         d40d->txd.tx_submit = d40_tx_submit;
1788
1789         if (d40c->log_num != D40_PHY_CHAN) {
1790
1791                 if (d40_pool_lli_alloc(d40d, 1, true) < 0) {
1792                         dev_err(&d40c->chan.dev->device,
1793                                 "[%s] Out of memory\n", __func__);
1794                         goto err;
1795                 }
1796                 d40d->lli_len = 1;
1797
1798                 d40_log_fill_lli(d40d->lli_log.src,
1799                                  src,
1800                                  size,
1801                                  0,
1802                                  d40c->log_def.lcsp1,
1803                                  d40c->dma_cfg.src_info.data_width,
1804                                  true, true);
1805
1806                 d40_log_fill_lli(d40d->lli_log.dst,
1807                                  dst,
1808                                  size,
1809                                  0,
1810                                  d40c->log_def.lcsp3,
1811                                  d40c->dma_cfg.dst_info.data_width,
1812                                  true, true);
1813
1814         } else {
1815
1816                 if (d40_pool_lli_alloc(d40d, 1, false) < 0) {
1817                         dev_err(&d40c->chan.dev->device,
1818                                 "[%s] Out of memory\n", __func__);
1819                         goto err;
1820                 }
1821
1822                 err = d40_phy_fill_lli(d40d->lli_phy.src,
1823                                        src,
1824                                        size,
1825                                        d40c->dma_cfg.src_info.psize,
1826                                        0,
1827                                        d40c->src_def_cfg,
1828                                        true,
1829                                        d40c->dma_cfg.src_info.data_width,
1830                                        false);
1831                 if (err)
1832                         goto err_fill_lli;
1833
1834                 err = d40_phy_fill_lli(d40d->lli_phy.dst,
1835                                        dst,
1836                                        size,
1837                                        d40c->dma_cfg.dst_info.psize,
1838                                        0,
1839                                        d40c->dst_def_cfg,
1840                                        true,
1841                                        d40c->dma_cfg.dst_info.data_width,
1842                                        false);
1843
1844                 if (err)
1845                         goto err_fill_lli;
1846
1847                 (void) dma_map_single(d40c->base->dev, d40d->lli_phy.src,
1848                                       d40d->lli_pool.size, DMA_TO_DEVICE);
1849         }
1850
1851         spin_unlock_irqrestore(&d40c->lock, flg);
1852         return &d40d->txd;
1853
1854 err_fill_lli:
1855         dev_err(&d40c->chan.dev->device,
1856                 "[%s] Failed filling in PHY LLI\n", __func__);
1857         d40_pool_lli_free(d40d);
1858 err:
1859         spin_unlock_irqrestore(&d40c->lock, flg);
1860         return NULL;
1861 }
1862
1863 static int d40_prep_slave_sg_log(struct d40_desc *d40d,
1864                                  struct d40_chan *d40c,
1865                                  struct scatterlist *sgl,
1866                                  unsigned int sg_len,
1867                                  enum dma_data_direction direction,
1868                                  unsigned long flags)
1869 {
1870         dma_addr_t dev_addr = 0;
1871         int total_size;
1872         int lli_max = d40c->base->plat_data->llis_per_log;
1873
1874         if (d40_pool_lli_alloc(d40d, sg_len, true) < 0) {
1875                 dev_err(&d40c->chan.dev->device,
1876                         "[%s] Out of memory\n", __func__);
1877                 return -ENOMEM;
1878         }
1879
1880         d40d->lli_len = sg_len;
1881         d40d->lli_tcount = 0;
1882
1883         if (sg_len > 1)
1884                 /*
1885                  * Check if there is space available in lcla.
1886                  * If not, split list into 1-length and run only
1887                  * in lcpa space.
1888                  */
1889                 if (d40_lcla_id_get(d40c, &d40c->base->lcla_pool) != 0)
1890                         lli_max = 1;
1891
1892         if (direction == DMA_FROM_DEVICE) {
1893                 dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
1894                 total_size = d40_log_sg_to_dev(&d40c->lcla,
1895                                                sgl, sg_len,
1896                                                &d40d->lli_log,
1897                                                &d40c->log_def,
1898                                                d40c->dma_cfg.src_info.data_width,
1899                                                d40c->dma_cfg.dst_info.data_width,
1900                                                direction,
1901                                                flags & DMA_PREP_INTERRUPT,
1902                                                dev_addr, lli_max,
1903                                                d40c->base->plat_data->llis_per_log);
1904         } else if (direction == DMA_TO_DEVICE) {
1905                 dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
1906                 total_size = d40_log_sg_to_dev(&d40c->lcla,
1907                                                sgl, sg_len,
1908                                                &d40d->lli_log,
1909                                                &d40c->log_def,
1910                                                d40c->dma_cfg.src_info.data_width,
1911                                                d40c->dma_cfg.dst_info.data_width,
1912                                                direction,
1913                                                flags & DMA_PREP_INTERRUPT,
1914                                                dev_addr, lli_max,
1915                                                d40c->base->plat_data->llis_per_log);
1916         } else
1917                 return -EINVAL;
1918         if (total_size < 0)
1919                 return -EINVAL;
1920
1921         return 0;
1922 }
1923
1924 static int d40_prep_slave_sg_phy(struct d40_desc *d40d,
1925                                  struct d40_chan *d40c,
1926                                  struct scatterlist *sgl,
1927                                  unsigned int sgl_len,
1928                                  enum dma_data_direction direction,
1929                                  unsigned long flags)
1930 {
1931         dma_addr_t src_dev_addr;
1932         dma_addr_t dst_dev_addr;
1933         int res;
1934
1935         if (d40_pool_lli_alloc(d40d, sgl_len, false) < 0) {
1936                 dev_err(&d40c->chan.dev->device,
1937                         "[%s] Out of memory\n", __func__);
1938                 return -ENOMEM;
1939         }
1940
1941         d40d->lli_len = sgl_len;
1942         d40d->lli_tcount = 0;
1943
1944         if (direction == DMA_FROM_DEVICE) {
1945                 dst_dev_addr = 0;
1946                 src_dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
1947         } else if (direction == DMA_TO_DEVICE) {
1948                 dst_dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
1949                 src_dev_addr = 0;
1950         } else
1951                 return -EINVAL;
1952
1953         res = d40_phy_sg_to_lli(sgl,
1954                                 sgl_len,
1955                                 src_dev_addr,
1956                                 d40d->lli_phy.src,
1957                                 d40d->lli_phy.src_addr,
1958                                 d40c->src_def_cfg,
1959                                 d40c->dma_cfg.src_info.data_width,
1960                                 d40c->dma_cfg.src_info.psize,
1961                                 true);
1962         if (res < 0)
1963                 return res;
1964
1965         res = d40_phy_sg_to_lli(sgl,
1966                                 sgl_len,
1967                                 dst_dev_addr,
1968                                 d40d->lli_phy.dst,
1969                                 d40d->lli_phy.dst_addr,
1970                                 d40c->dst_def_cfg,
1971                                 d40c->dma_cfg.dst_info.data_width,
1972                                 d40c->dma_cfg.dst_info.psize,
1973                                  true);
1974         if (res < 0)
1975                 return res;
1976
1977         (void) dma_map_single(d40c->base->dev, d40d->lli_phy.src,
1978                               d40d->lli_pool.size, DMA_TO_DEVICE);
1979         return 0;
1980 }
1981
1982 static struct dma_async_tx_descriptor *d40_prep_slave_sg(struct dma_chan *chan,
1983                                                          struct scatterlist *sgl,
1984                                                          unsigned int sg_len,
1985                                                          enum dma_data_direction direction,
1986                                                          unsigned long flags)
1987 {
1988         struct d40_desc *d40d;
1989         struct d40_chan *d40c = container_of(chan, struct d40_chan,
1990                                              chan);
1991         unsigned long flg;
1992         int err;
1993
1994         if (d40c->dma_cfg.pre_transfer)
1995                 d40c->dma_cfg.pre_transfer(chan,
1996                                            d40c->dma_cfg.pre_transfer_data,
1997                                            sg_dma_len(sgl));
1998
1999         spin_lock_irqsave(&d40c->lock, flg);
2000         d40d = d40_desc_get(d40c);
2001         spin_unlock_irqrestore(&d40c->lock, flg);
2002
2003         if (d40d == NULL)
2004                 return NULL;
2005
2006         memset(d40d, 0, sizeof(struct d40_desc));
2007
2008         if (d40c->log_num != D40_PHY_CHAN)
2009                 err = d40_prep_slave_sg_log(d40d, d40c, sgl, sg_len,
2010                                             direction, flags);
2011         else
2012                 err = d40_prep_slave_sg_phy(d40d, d40c, sgl, sg_len,
2013                                             direction, flags);
2014         if (err) {
2015                 dev_err(&d40c->chan.dev->device,
2016                         "[%s] Failed to prepare %s slave sg job: %d\n",
2017                         __func__,
2018                         d40c->log_num != D40_PHY_CHAN ? "log" : "phy", err);
2019                 return NULL;
2020         }
2021
2022         d40d->txd.flags = flags;
2023
2024         dma_async_tx_descriptor_init(&d40d->txd, chan);
2025
2026         d40d->txd.tx_submit = d40_tx_submit;
2027
2028         return &d40d->txd;
2029 }
2030
2031 static enum dma_status d40_tx_status(struct dma_chan *chan,
2032                                      dma_cookie_t cookie,
2033                                      struct dma_tx_state *txstate)
2034 {
2035         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2036         dma_cookie_t last_used;
2037         dma_cookie_t last_complete;
2038         int ret;
2039
2040         last_complete = d40c->completed;
2041         last_used = chan->cookie;
2042
2043         if (d40_is_paused(d40c))
2044                 ret = DMA_PAUSED;
2045         else
2046                 ret = dma_async_is_complete(cookie, last_complete, last_used);
2047
2048         dma_set_tx_state(txstate, last_complete, last_used,
2049                          stedma40_residue(chan));
2050
2051         return ret;
2052 }
2053
2054 static void d40_issue_pending(struct dma_chan *chan)
2055 {
2056         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2057         unsigned long flags;
2058
2059         spin_lock_irqsave(&d40c->lock, flags);
2060
2061         /* Busy means that pending jobs are already being processed */
2062         if (!d40c->busy)
2063                 (void) d40_queue_start(d40c);
2064
2065         spin_unlock_irqrestore(&d40c->lock, flags);
2066 }
2067
2068 static int d40_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
2069 {
2070         unsigned long flags;
2071         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2072
2073         switch (cmd) {
2074         case DMA_TERMINATE_ALL:
2075                 spin_lock_irqsave(&d40c->lock, flags);
2076                 d40_term_all(d40c);
2077                 spin_unlock_irqrestore(&d40c->lock, flags);
2078                 return 0;
2079         case DMA_PAUSE:
2080                 return d40_pause(chan);
2081         case DMA_RESUME:
2082                 return d40_resume(chan);
2083         }
2084
2085         /* Other commands are unimplemented */
2086         return -ENXIO;
2087 }
2088
2089 /* Initialization functions */
2090
2091 static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma,
2092                                  struct d40_chan *chans, int offset,
2093                                  int num_chans)
2094 {
2095         int i = 0;
2096         struct d40_chan *d40c;
2097
2098         INIT_LIST_HEAD(&dma->channels);
2099
2100         for (i = offset; i < offset + num_chans; i++) {
2101                 d40c = &chans[i];
2102                 d40c->base = base;
2103                 d40c->chan.device = dma;
2104
2105                 /* Invalidate lcla element */
2106                 d40c->lcla.src_id = -1;
2107                 d40c->lcla.dst_id = -1;
2108
2109                 spin_lock_init(&d40c->lock);
2110
2111                 d40c->log_num = D40_PHY_CHAN;
2112
2113                 INIT_LIST_HEAD(&d40c->free);
2114                 INIT_LIST_HEAD(&d40c->active);
2115                 INIT_LIST_HEAD(&d40c->queue);
2116                 INIT_LIST_HEAD(&d40c->client);
2117
2118                 d40c->free_len = 0;
2119
2120                 tasklet_init(&d40c->tasklet, dma_tasklet,
2121                              (unsigned long) d40c);
2122
2123                 list_add_tail(&d40c->chan.device_node,
2124                               &dma->channels);
2125         }
2126 }
2127
2128 static int __init d40_dmaengine_init(struct d40_base *base,
2129                                      int num_reserved_chans)
2130 {
2131         int err ;
2132
2133         d40_chan_init(base, &base->dma_slave, base->log_chans,
2134                       0, base->num_log_chans);
2135
2136         dma_cap_zero(base->dma_slave.cap_mask);
2137         dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask);
2138
2139         base->dma_slave.device_alloc_chan_resources = d40_alloc_chan_resources;
2140         base->dma_slave.device_free_chan_resources = d40_free_chan_resources;
2141         base->dma_slave.device_prep_dma_memcpy = d40_prep_memcpy;
2142         base->dma_slave.device_prep_slave_sg = d40_prep_slave_sg;
2143         base->dma_slave.device_tx_status = d40_tx_status;
2144         base->dma_slave.device_issue_pending = d40_issue_pending;
2145         base->dma_slave.device_control = d40_control;
2146         base->dma_slave.dev = base->dev;
2147
2148         err = dma_async_device_register(&base->dma_slave);
2149
2150         if (err) {
2151                 dev_err(base->dev,
2152                         "[%s] Failed to register slave channels\n",
2153                         __func__);
2154                 goto failure1;
2155         }
2156
2157         d40_chan_init(base, &base->dma_memcpy, base->log_chans,
2158                       base->num_log_chans, base->plat_data->memcpy_len);
2159
2160         dma_cap_zero(base->dma_memcpy.cap_mask);
2161         dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask);
2162
2163         base->dma_memcpy.device_alloc_chan_resources = d40_alloc_chan_resources;
2164         base->dma_memcpy.device_free_chan_resources = d40_free_chan_resources;
2165         base->dma_memcpy.device_prep_dma_memcpy = d40_prep_memcpy;
2166         base->dma_memcpy.device_prep_slave_sg = d40_prep_slave_sg;
2167         base->dma_memcpy.device_tx_status = d40_tx_status;
2168         base->dma_memcpy.device_issue_pending = d40_issue_pending;
2169         base->dma_memcpy.device_control = d40_control;
2170         base->dma_memcpy.dev = base->dev;
2171         /*
2172          * This controller can only access address at even
2173          * 32bit boundaries, i.e. 2^2
2174          */
2175         base->dma_memcpy.copy_align = 2;
2176
2177         err = dma_async_device_register(&base->dma_memcpy);
2178
2179         if (err) {
2180                 dev_err(base->dev,
2181                         "[%s] Failed to regsiter memcpy only channels\n",
2182                         __func__);
2183                 goto failure2;
2184         }
2185
2186         d40_chan_init(base, &base->dma_both, base->phy_chans,
2187                       0, num_reserved_chans);
2188
2189         dma_cap_zero(base->dma_both.cap_mask);
2190         dma_cap_set(DMA_SLAVE, base->dma_both.cap_mask);
2191         dma_cap_set(DMA_MEMCPY, base->dma_both.cap_mask);
2192
2193         base->dma_both.device_alloc_chan_resources = d40_alloc_chan_resources;
2194         base->dma_both.device_free_chan_resources = d40_free_chan_resources;
2195         base->dma_both.device_prep_dma_memcpy = d40_prep_memcpy;
2196         base->dma_both.device_prep_slave_sg = d40_prep_slave_sg;
2197         base->dma_both.device_tx_status = d40_tx_status;
2198         base->dma_both.device_issue_pending = d40_issue_pending;
2199         base->dma_both.device_control = d40_control;
2200         base->dma_both.dev = base->dev;
2201         base->dma_both.copy_align = 2;
2202         err = dma_async_device_register(&base->dma_both);
2203
2204         if (err) {
2205                 dev_err(base->dev,
2206                         "[%s] Failed to register logical and physical capable channels\n",
2207                         __func__);
2208                 goto failure3;
2209         }
2210         return 0;
2211 failure3:
2212         dma_async_device_unregister(&base->dma_memcpy);
2213 failure2:
2214         dma_async_device_unregister(&base->dma_slave);
2215 failure1:
2216         return err;
2217 }
2218
2219 /* Initialization functions. */
2220
2221 static int __init d40_phy_res_init(struct d40_base *base)
2222 {
2223         int i;
2224         int num_phy_chans_avail = 0;
2225         u32 val[2];
2226         int odd_even_bit = -2;
2227
2228         val[0] = readl(base->virtbase + D40_DREG_PRSME);
2229         val[1] = readl(base->virtbase + D40_DREG_PRSMO);
2230
2231         for (i = 0; i < base->num_phy_chans; i++) {
2232                 base->phy_res[i].num = i;
2233                 odd_even_bit += 2 * ((i % 2) == 0);
2234                 if (((val[i % 2] >> odd_even_bit) & 3) == 1) {
2235                         /* Mark security only channels as occupied */
2236                         base->phy_res[i].allocated_src = D40_ALLOC_PHY;
2237                         base->phy_res[i].allocated_dst = D40_ALLOC_PHY;
2238                 } else {
2239                         base->phy_res[i].allocated_src = D40_ALLOC_FREE;
2240                         base->phy_res[i].allocated_dst = D40_ALLOC_FREE;
2241                         num_phy_chans_avail++;
2242                 }
2243                 spin_lock_init(&base->phy_res[i].lock);
2244         }
2245         dev_info(base->dev, "%d of %d physical DMA channels available\n",
2246                  num_phy_chans_avail, base->num_phy_chans);
2247
2248         /* Verify settings extended vs standard */
2249         val[0] = readl(base->virtbase + D40_DREG_PRTYP);
2250
2251         for (i = 0; i < base->num_phy_chans; i++) {
2252
2253                 if (base->phy_res[i].allocated_src == D40_ALLOC_FREE &&
2254                     (val[0] & 0x3) != 1)
2255                         dev_info(base->dev,
2256                                  "[%s] INFO: channel %d is misconfigured (%d)\n",
2257                                  __func__, i, val[0] & 0x3);
2258
2259                 val[0] = val[0] >> 2;
2260         }
2261
2262         return num_phy_chans_avail;
2263 }
2264
2265 static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
2266 {
2267         static const struct d40_reg_val dma_id_regs[] = {
2268                 /* Peripheral Id */
2269                 { .reg = D40_DREG_PERIPHID0, .val = 0x0040},
2270                 { .reg = D40_DREG_PERIPHID1, .val = 0x0000},
2271                 /*
2272                  * D40_DREG_PERIPHID2 Depends on HW revision:
2273                  *  MOP500/HREF ED has 0x0008,
2274                  *  ? has 0x0018,
2275                  *  HREF V1 has 0x0028
2276                  */
2277                 { .reg = D40_DREG_PERIPHID3, .val = 0x0000},
2278
2279                 /* PCell Id */
2280                 { .reg = D40_DREG_CELLID0, .val = 0x000d},
2281                 { .reg = D40_DREG_CELLID1, .val = 0x00f0},
2282                 { .reg = D40_DREG_CELLID2, .val = 0x0005},
2283                 { .reg = D40_DREG_CELLID3, .val = 0x00b1}
2284         };
2285         struct stedma40_platform_data *plat_data;
2286         struct clk *clk = NULL;
2287         void __iomem *virtbase = NULL;
2288         struct resource *res = NULL;
2289         struct d40_base *base = NULL;
2290         int num_log_chans = 0;
2291         int num_phy_chans;
2292         int i;
2293
2294         clk = clk_get(&pdev->dev, NULL);
2295
2296         if (IS_ERR(clk)) {
2297                 dev_err(&pdev->dev, "[%s] No matching clock found\n",
2298                         __func__);
2299                 goto failure;
2300         }
2301
2302         clk_enable(clk);
2303
2304         /* Get IO for DMAC base address */
2305         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base");
2306         if (!res)
2307                 goto failure;
2308
2309         if (request_mem_region(res->start, resource_size(res),
2310                                D40_NAME " I/O base") == NULL)
2311                 goto failure;
2312
2313         virtbase = ioremap(res->start, resource_size(res));
2314         if (!virtbase)
2315                 goto failure;
2316
2317         /* HW version check */
2318         for (i = 0; i < ARRAY_SIZE(dma_id_regs); i++) {
2319                 if (dma_id_regs[i].val !=
2320                     readl(virtbase + dma_id_regs[i].reg)) {
2321                         dev_err(&pdev->dev,
2322                                 "[%s] Unknown hardware! Expected 0x%x at 0x%x but got 0x%x\n",
2323                                 __func__,
2324                                 dma_id_regs[i].val,
2325                                 dma_id_regs[i].reg,
2326                                 readl(virtbase + dma_id_regs[i].reg));
2327                         goto failure;
2328                 }
2329         }
2330
2331         i = readl(virtbase + D40_DREG_PERIPHID2);
2332
2333         if ((i & 0xf) != D40_PERIPHID2_DESIGNER) {
2334                 dev_err(&pdev->dev,
2335                         "[%s] Unknown designer! Got %x wanted %x\n",
2336                         __func__, i & 0xf, D40_PERIPHID2_DESIGNER);
2337                 goto failure;
2338         }
2339
2340         /* The number of physical channels on this HW */
2341         num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
2342
2343         dev_info(&pdev->dev, "hardware revision: %d @ 0x%x\n",
2344                  (i >> 4) & 0xf, res->start);
2345
2346         plat_data = pdev->dev.platform_data;
2347
2348         /* Count the number of logical channels in use */
2349         for (i = 0; i < plat_data->dev_len; i++)
2350                 if (plat_data->dev_rx[i] != 0)
2351                         num_log_chans++;
2352
2353         for (i = 0; i < plat_data->dev_len; i++)
2354                 if (plat_data->dev_tx[i] != 0)
2355                         num_log_chans++;
2356
2357         base = kzalloc(ALIGN(sizeof(struct d40_base), 4) +
2358                        (num_phy_chans + num_log_chans + plat_data->memcpy_len) *
2359                        sizeof(struct d40_chan), GFP_KERNEL);
2360
2361         if (base == NULL) {
2362                 dev_err(&pdev->dev, "[%s] Out of memory\n", __func__);
2363                 goto failure;
2364         }
2365
2366         base->clk = clk;
2367         base->num_phy_chans = num_phy_chans;
2368         base->num_log_chans = num_log_chans;
2369         base->phy_start = res->start;
2370         base->phy_size = resource_size(res);
2371         base->virtbase = virtbase;
2372         base->plat_data = plat_data;
2373         base->dev = &pdev->dev;
2374         base->phy_chans = ((void *)base) + ALIGN(sizeof(struct d40_base), 4);
2375         base->log_chans = &base->phy_chans[num_phy_chans];
2376
2377         base->phy_res = kzalloc(num_phy_chans * sizeof(struct d40_phy_res),
2378                                 GFP_KERNEL);
2379         if (!base->phy_res)
2380                 goto failure;
2381
2382         base->lookup_phy_chans = kzalloc(num_phy_chans *
2383                                          sizeof(struct d40_chan *),
2384                                          GFP_KERNEL);
2385         if (!base->lookup_phy_chans)
2386                 goto failure;
2387
2388         if (num_log_chans + plat_data->memcpy_len) {
2389                 /*
2390                  * The max number of logical channels are event lines for all
2391                  * src devices and dst devices
2392                  */
2393                 base->lookup_log_chans = kzalloc(plat_data->dev_len * 2 *
2394                                                  sizeof(struct d40_chan *),
2395                                                  GFP_KERNEL);
2396                 if (!base->lookup_log_chans)
2397                         goto failure;
2398         }
2399         base->lcla_pool.alloc_map = kzalloc(num_phy_chans * sizeof(u32),
2400                                             GFP_KERNEL);
2401         if (!base->lcla_pool.alloc_map)
2402                 goto failure;
2403
2404         return base;
2405
2406 failure:
2407         if (clk) {
2408                 clk_disable(clk);
2409                 clk_put(clk);
2410         }
2411         if (virtbase)
2412                 iounmap(virtbase);
2413         if (res)
2414                 release_mem_region(res->start,
2415                                    resource_size(res));
2416         if (virtbase)
2417                 iounmap(virtbase);
2418
2419         if (base) {
2420                 kfree(base->lcla_pool.alloc_map);
2421                 kfree(base->lookup_log_chans);
2422                 kfree(base->lookup_phy_chans);
2423                 kfree(base->phy_res);
2424                 kfree(base);
2425         }
2426
2427         return NULL;
2428 }
2429
2430 static void __init d40_hw_init(struct d40_base *base)
2431 {
2432
2433         static const struct d40_reg_val dma_init_reg[] = {
2434                 /* Clock every part of the DMA block from start */
2435                 { .reg = D40_DREG_GCC,    .val = 0x0000ff01},
2436
2437                 /* Interrupts on all logical channels */
2438                 { .reg = D40_DREG_LCMIS0, .val = 0xFFFFFFFF},
2439                 { .reg = D40_DREG_LCMIS1, .val = 0xFFFFFFFF},
2440                 { .reg = D40_DREG_LCMIS2, .val = 0xFFFFFFFF},
2441                 { .reg = D40_DREG_LCMIS3, .val = 0xFFFFFFFF},
2442                 { .reg = D40_DREG_LCICR0, .val = 0xFFFFFFFF},
2443                 { .reg = D40_DREG_LCICR1, .val = 0xFFFFFFFF},
2444                 { .reg = D40_DREG_LCICR2, .val = 0xFFFFFFFF},
2445                 { .reg = D40_DREG_LCICR3, .val = 0xFFFFFFFF},
2446                 { .reg = D40_DREG_LCTIS0, .val = 0xFFFFFFFF},
2447                 { .reg = D40_DREG_LCTIS1, .val = 0xFFFFFFFF},
2448                 { .reg = D40_DREG_LCTIS2, .val = 0xFFFFFFFF},
2449                 { .reg = D40_DREG_LCTIS3, .val = 0xFFFFFFFF}
2450         };
2451         int i;
2452         u32 prmseo[2] = {0, 0};
2453         u32 activeo[2] = {0xFFFFFFFF, 0xFFFFFFFF};
2454         u32 pcmis = 0;
2455         u32 pcicr = 0;
2456
2457         for (i = 0; i < ARRAY_SIZE(dma_init_reg); i++)
2458                 writel(dma_init_reg[i].val,
2459                        base->virtbase + dma_init_reg[i].reg);
2460
2461         /* Configure all our dma channels to default settings */
2462         for (i = 0; i < base->num_phy_chans; i++) {
2463
2464                 activeo[i % 2] = activeo[i % 2] << 2;
2465
2466                 if (base->phy_res[base->num_phy_chans - i - 1].allocated_src
2467                     == D40_ALLOC_PHY) {
2468                         activeo[i % 2] |= 3;
2469                         continue;
2470                 }
2471
2472                 /* Enable interrupt # */
2473                 pcmis = (pcmis << 1) | 1;
2474
2475                 /* Clear interrupt # */
2476                 pcicr = (pcicr << 1) | 1;
2477
2478                 /* Set channel to physical mode */
2479                 prmseo[i % 2] = prmseo[i % 2] << 2;
2480                 prmseo[i % 2] |= 1;
2481
2482         }
2483
2484         writel(prmseo[1], base->virtbase + D40_DREG_PRMSE);
2485         writel(prmseo[0], base->virtbase + D40_DREG_PRMSO);
2486         writel(activeo[1], base->virtbase + D40_DREG_ACTIVE);
2487         writel(activeo[0], base->virtbase + D40_DREG_ACTIVO);
2488
2489         /* Write which interrupt to enable */
2490         writel(pcmis, base->virtbase + D40_DREG_PCMIS);
2491
2492         /* Write which interrupt to clear */
2493         writel(pcicr, base->virtbase + D40_DREG_PCICR);
2494
2495 }
2496
2497 static int __init d40_probe(struct platform_device *pdev)
2498 {
2499         int err;
2500         int ret = -ENOENT;
2501         struct d40_base *base;
2502         struct resource *res = NULL;
2503         int num_reserved_chans;
2504         u32 val;
2505
2506         base = d40_hw_detect_init(pdev);
2507
2508         if (!base)
2509                 goto failure;
2510
2511         num_reserved_chans = d40_phy_res_init(base);
2512
2513         platform_set_drvdata(pdev, base);
2514
2515         spin_lock_init(&base->interrupt_lock);
2516         spin_lock_init(&base->execmd_lock);
2517
2518         /* Get IO for logical channel parameter address */
2519         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcpa");
2520         if (!res) {
2521                 ret = -ENOENT;
2522                 dev_err(&pdev->dev,
2523                         "[%s] No \"lcpa\" memory resource\n",
2524                         __func__);
2525                 goto failure;
2526         }
2527         base->lcpa_size = resource_size(res);
2528         base->phy_lcpa = res->start;
2529
2530         if (request_mem_region(res->start, resource_size(res),
2531                                D40_NAME " I/O lcpa") == NULL) {
2532                 ret = -EBUSY;
2533                 dev_err(&pdev->dev,
2534                         "[%s] Failed to request LCPA region 0x%x-0x%x\n",
2535                         __func__, res->start, res->end);
2536                 goto failure;
2537         }
2538
2539         /* We make use of ESRAM memory for this. */
2540         val = readl(base->virtbase + D40_DREG_LCPA);
2541         if (res->start != val && val != 0) {
2542                 dev_warn(&pdev->dev,
2543                          "[%s] Mismatch LCPA dma 0x%x, def 0x%x\n",
2544                          __func__, val, res->start);
2545         } else
2546                 writel(res->start, base->virtbase + D40_DREG_LCPA);
2547
2548         base->lcpa_base = ioremap(res->start, resource_size(res));
2549         if (!base->lcpa_base) {
2550                 ret = -ENOMEM;
2551                 dev_err(&pdev->dev,
2552                         "[%s] Failed to ioremap LCPA region\n",
2553                         __func__);
2554                 goto failure;
2555         }
2556         /* Get IO for logical channel link address */
2557         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcla");
2558         if (!res) {
2559                 ret = -ENOENT;
2560                 dev_err(&pdev->dev,
2561                         "[%s] No \"lcla\" resource defined\n",
2562                         __func__);
2563                 goto failure;
2564         }
2565
2566         base->lcla_pool.base_size = resource_size(res);
2567         base->lcla_pool.phy = res->start;
2568
2569         if (request_mem_region(res->start, resource_size(res),
2570                                D40_NAME " I/O lcla") == NULL) {
2571                 ret = -EBUSY;
2572                 dev_err(&pdev->dev,
2573                         "[%s] Failed to request LCLA region 0x%x-0x%x\n",
2574                         __func__, res->start, res->end);
2575                 goto failure;
2576         }
2577         val = readl(base->virtbase + D40_DREG_LCLA);
2578         if (res->start != val && val != 0) {
2579                 dev_warn(&pdev->dev,
2580                          "[%s] Mismatch LCLA dma 0x%x, def 0x%x\n",
2581                          __func__, val, res->start);
2582         } else
2583                 writel(res->start, base->virtbase + D40_DREG_LCLA);
2584
2585         base->lcla_pool.base = ioremap(res->start, resource_size(res));
2586         if (!base->lcla_pool.base) {
2587                 ret = -ENOMEM;
2588                 dev_err(&pdev->dev,
2589                         "[%s] Failed to ioremap LCLA 0x%x-0x%x\n",
2590                         __func__, res->start, res->end);
2591                 goto failure;
2592         }
2593
2594         spin_lock_init(&base->lcla_pool.lock);
2595
2596         base->lcla_pool.num_blocks = base->num_phy_chans;
2597
2598         base->irq = platform_get_irq(pdev, 0);
2599
2600         ret = request_irq(base->irq, d40_handle_interrupt, 0, D40_NAME, base);
2601
2602         if (ret) {
2603                 dev_err(&pdev->dev, "[%s] No IRQ defined\n", __func__);
2604                 goto failure;
2605         }
2606
2607         err = d40_dmaengine_init(base, num_reserved_chans);
2608         if (err)
2609                 goto failure;
2610
2611         d40_hw_init(base);
2612
2613         dev_info(base->dev, "initialized\n");
2614         return 0;
2615
2616 failure:
2617         if (base) {
2618                 if (base->virtbase)
2619                         iounmap(base->virtbase);
2620                 if (base->lcla_pool.phy)
2621                         release_mem_region(base->lcla_pool.phy,
2622                                            base->lcla_pool.base_size);
2623                 if (base->phy_lcpa)
2624                         release_mem_region(base->phy_lcpa,
2625                                            base->lcpa_size);
2626                 if (base->phy_start)
2627                         release_mem_region(base->phy_start,
2628                                            base->phy_size);
2629                 if (base->clk) {
2630                         clk_disable(base->clk);
2631                         clk_put(base->clk);
2632                 }
2633
2634                 kfree(base->lcla_pool.alloc_map);
2635                 kfree(base->lookup_log_chans);
2636                 kfree(base->lookup_phy_chans);
2637                 kfree(base->phy_res);
2638                 kfree(base);
2639         }
2640
2641         dev_err(&pdev->dev, "[%s] probe failed\n", __func__);
2642         return ret;
2643 }
2644
2645 static struct platform_driver d40_driver = {
2646         .driver = {
2647                 .owner = THIS_MODULE,
2648                 .name  = D40_NAME,
2649         },
2650 };
2651
2652 int __init stedma40_init(void)
2653 {
2654         return platform_driver_probe(&d40_driver, d40_probe);
2655 }
2656 arch_initcall(stedma40_init);