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Merge tag 'nfs-for-3.5-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
[linux-2.6-block.git] / drivers / rapidio / devices / tsi721_dma.c
CommitLineData
9eaa3d9b
AB		 1/*
2 * DMA Engine support for Tsi721 PCIExpress-to-SRIO bridge
3 *
4 * Copyright 2011 Integrated Device Technology, Inc.
5 * Alexandre Bounine <alexandre.bounine@idt.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc., 59
19 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21
22#include <linux/io.h>
23#include <linux/errno.h>
24#include <linux/init.h>
25#include <linux/ioport.h>
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/pci.h>
29#include <linux/rio.h>
30#include <linux/rio_drv.h>
31#include <linux/dma-mapping.h>
32#include <linux/interrupt.h>
33#include <linux/kfifo.h>
34#include <linux/delay.h>
35
36#include "tsi721.h"
37
38static inline struct tsi721_bdma_chan *to_tsi721_chan(struct dma_chan *chan)
39{
40 return container_of(chan, struct tsi721_bdma_chan, dchan);
41}
42
43static inline struct tsi721_device *to_tsi721(struct dma_device *ddev)
44{
45 return container_of(ddev, struct rio_mport, dma)->priv;
46}
47
48static inline
49struct tsi721_tx_desc *to_tsi721_desc(struct dma_async_tx_descriptor *txd)
50{
51 return container_of(txd, struct tsi721_tx_desc, txd);
52}
53
54static inline
55struct tsi721_tx_desc *tsi721_dma_first_active(
56 struct tsi721_bdma_chan *bdma_chan)
57{
58 return list_first_entry(&bdma_chan->active_list,
59 struct tsi721_tx_desc, desc_node);
60}
61
62static int tsi721_bdma_ch_init(struct tsi721_bdma_chan *bdma_chan)
63{
64 struct tsi721_dma_desc *bd_ptr;
65 struct device *dev = bdma_chan->dchan.device->dev;
66 u64 *sts_ptr;
67 dma_addr_t bd_phys;
68 dma_addr_t sts_phys;
69 int sts_size;
70 int bd_num = bdma_chan->bd_num;
71
72 dev_dbg(dev, "Init Block DMA Engine, CH%d\n", bdma_chan->id);
73
74 /* Allocate space for DMA descriptors */
75 bd_ptr = dma_zalloc_coherent(dev,
76 bd_num * sizeof(struct tsi721_dma_desc),
77 &bd_phys, GFP_KERNEL);
78 if (!bd_ptr)
79 return -ENOMEM;
80
81 bdma_chan->bd_phys = bd_phys;
82 bdma_chan->bd_base = bd_ptr;
83
84 dev_dbg(dev, "DMA descriptors @ %p (phys = %llx)\n",
85 bd_ptr, (unsigned long long)bd_phys);
86
87 /* Allocate space for descriptor status FIFO */
88 sts_size = (bd_num >= TSI721_DMA_MINSTSSZ) ?
89 bd_num : TSI721_DMA_MINSTSSZ;
90 sts_size = roundup_pow_of_two(sts_size);
91 sts_ptr = dma_zalloc_coherent(dev,
92 sts_size * sizeof(struct tsi721_dma_sts),
93 &sts_phys, GFP_KERNEL);
94 if (!sts_ptr) {
95 /* Free space allocated for DMA descriptors */
96 dma_free_coherent(dev,
97 bd_num * sizeof(struct tsi721_dma_desc),
98 bd_ptr, bd_phys);
99 bdma_chan->bd_base = NULL;
100 return -ENOMEM;
101 }
102
103 bdma_chan->sts_phys = sts_phys;
104 bdma_chan->sts_base = sts_ptr;
105 bdma_chan->sts_size = sts_size;
106
107 dev_dbg(dev,
108 "desc status FIFO @ %p (phys = %llx) size=0x%x\n",
109 sts_ptr, (unsigned long long)sts_phys, sts_size);
110
111 /* Initialize DMA descriptors ring */
112 bd_ptr[bd_num - 1].type_id = cpu_to_le32(DTYPE3 << 29);
113 bd_ptr[bd_num - 1].next_lo = cpu_to_le32((u64)bd_phys &
114 TSI721_DMAC_DPTRL_MASK);
115 bd_ptr[bd_num - 1].next_hi = cpu_to_le32((u64)bd_phys >> 32);
116
117 /* Setup DMA descriptor pointers */
118 iowrite32(((u64)bd_phys >> 32),
119 bdma_chan->regs + TSI721_DMAC_DPTRH);
120 iowrite32(((u64)bd_phys & TSI721_DMAC_DPTRL_MASK),
121 bdma_chan->regs + TSI721_DMAC_DPTRL);
122
123 /* Setup descriptor status FIFO */
124 iowrite32(((u64)sts_phys >> 32),
125 bdma_chan->regs + TSI721_DMAC_DSBH);
126 iowrite32(((u64)sts_phys & TSI721_DMAC_DSBL_MASK),
127 bdma_chan->regs + TSI721_DMAC_DSBL);
128 iowrite32(TSI721_DMAC_DSSZ_SIZE(sts_size),
129 bdma_chan->regs + TSI721_DMAC_DSSZ);
130
131 /* Clear interrupt bits */
132 iowrite32(TSI721_DMAC_INT_ALL,
133 bdma_chan->regs + TSI721_DMAC_INT);
134
135 ioread32(bdma_chan->regs + TSI721_DMAC_INT);
136
137 /* Toggle DMA channel initialization */
138 iowrite32(TSI721_DMAC_CTL_INIT, bdma_chan->regs + TSI721_DMAC_CTL);
139 ioread32(bdma_chan->regs + TSI721_DMAC_CTL);
140 bdma_chan->wr_count = bdma_chan->wr_count_next = 0;
141 bdma_chan->sts_rdptr = 0;
142 udelay(10);
143
144 return 0;
145}
146
147static int tsi721_bdma_ch_free(struct tsi721_bdma_chan *bdma_chan)
148{
149 u32 ch_stat;
150
151 if (bdma_chan->bd_base == NULL)
152 return 0;
153
154 /* Check if DMA channel still running */
155 ch_stat = ioread32(bdma_chan->regs + TSI721_DMAC_STS);
156 if (ch_stat & TSI721_DMAC_STS_RUN)
157 return -EFAULT;
158
159 /* Put DMA channel into init state */
160 iowrite32(TSI721_DMAC_CTL_INIT, bdma_chan->regs + TSI721_DMAC_CTL);
161
162 /* Free space allocated for DMA descriptors */
163 dma_free_coherent(bdma_chan->dchan.device->dev,
164 bdma_chan->bd_num * sizeof(struct tsi721_dma_desc),
165 bdma_chan->bd_base, bdma_chan->bd_phys);
166 bdma_chan->bd_base = NULL;
167
168 /* Free space allocated for status FIFO */
169 dma_free_coherent(bdma_chan->dchan.device->dev,
170 bdma_chan->sts_size * sizeof(struct tsi721_dma_sts),
171 bdma_chan->sts_base, bdma_chan->sts_phys);
172 bdma_chan->sts_base = NULL;
173 return 0;
174}
175
176static void
177tsi721_bdma_interrupt_enable(struct tsi721_bdma_chan *bdma_chan, int enable)
178{
179 if (enable) {
180 /* Clear pending BDMA channel interrupts */
181 iowrite32(TSI721_DMAC_INT_ALL,
182 bdma_chan->regs + TSI721_DMAC_INT);
183 ioread32(bdma_chan->regs + TSI721_DMAC_INT);
184 /* Enable BDMA channel interrupts */
185 iowrite32(TSI721_DMAC_INT_ALL,
186 bdma_chan->regs + TSI721_DMAC_INTE);
187 } else {
188 /* Disable BDMA channel interrupts */
189 iowrite32(0, bdma_chan->regs + TSI721_DMAC_INTE);
190 /* Clear pending BDMA channel interrupts */
191 iowrite32(TSI721_DMAC_INT_ALL,
192 bdma_chan->regs + TSI721_DMAC_INT);
193 }
194
195}
196
197static bool tsi721_dma_is_idle(struct tsi721_bdma_chan *bdma_chan)
198{
199 u32 sts;
200
201 sts = ioread32(bdma_chan->regs + TSI721_DMAC_STS);
202 return ((sts & TSI721_DMAC_STS_RUN) == 0);
203}
204
205void tsi721_bdma_handler(struct tsi721_bdma_chan *bdma_chan)
206{
207 /* Disable BDMA channel interrupts */
208 iowrite32(0, bdma_chan->regs + TSI721_DMAC_INTE);
209
210 tasklet_schedule(&bdma_chan->tasklet);
211}
212
213#ifdef CONFIG_PCI_MSI
214/**
215 * tsi721_omsg_msix - MSI-X interrupt handler for BDMA channels
216 * @irq: Linux interrupt number
217 * @ptr: Pointer to interrupt-specific data (BDMA channel structure)
218 *
219 * Handles BDMA channel interrupts signaled using MSI-X.
220 */
221static irqreturn_t tsi721_bdma_msix(int irq, void *ptr)
222{
223 struct tsi721_bdma_chan *bdma_chan = ptr;
224
225 tsi721_bdma_handler(bdma_chan);
226 return IRQ_HANDLED;
227}
228#endif /* CONFIG_PCI_MSI */
229
230/* Must be called with the spinlock held */
231static void tsi721_start_dma(struct tsi721_bdma_chan *bdma_chan)
232{
233 if (!tsi721_dma_is_idle(bdma_chan)) {
234 dev_err(bdma_chan->dchan.device->dev,
235 "BUG: Attempt to start non-idle channel\n");
236 return;
237 }
238
239 if (bdma_chan->wr_count == bdma_chan->wr_count_next) {
240 dev_err(bdma_chan->dchan.device->dev,
241 "BUG: Attempt to start DMA with no BDs ready\n");
242 return;
243 }
244
245 dev_dbg(bdma_chan->dchan.device->dev,
246 "tx_chan: %p, chan: %d, regs: %p\n",
247 bdma_chan, bdma_chan->dchan.chan_id, bdma_chan->regs);
248
249 iowrite32(bdma_chan->wr_count_next,
250 bdma_chan->regs + TSI721_DMAC_DWRCNT);
251 ioread32(bdma_chan->regs + TSI721_DMAC_DWRCNT);
252
253 bdma_chan->wr_count = bdma_chan->wr_count_next;
254}
255
256static void tsi721_desc_put(struct tsi721_bdma_chan *bdma_chan,
257 struct tsi721_tx_desc *desc)
258{
259 dev_dbg(bdma_chan->dchan.device->dev,
260 "Put desc: %p into free list\n", desc);
261
262 if (desc) {
263 spin_lock_bh(&bdma_chan->lock);
264 list_splice_init(&desc->tx_list, &bdma_chan->free_list);
265 list_add(&desc->desc_node, &bdma_chan->free_list);
266 bdma_chan->wr_count_next = bdma_chan->wr_count;
267 spin_unlock_bh(&bdma_chan->lock);
268 }
269}
270
271static
272struct tsi721_tx_desc *tsi721_desc_get(struct tsi721_bdma_chan *bdma_chan)
273{
274 struct tsi721_tx_desc *tx_desc, *_tx_desc;
275 struct tsi721_tx_desc *ret = NULL;
276 int i;
277
278 spin_lock_bh(&bdma_chan->lock);
279 list_for_each_entry_safe(tx_desc, _tx_desc,
280 &bdma_chan->free_list, desc_node) {
281 if (async_tx_test_ack(&tx_desc->txd)) {
282 list_del(&tx_desc->desc_node);
283 ret = tx_desc;
284 break;
285 }
286 dev_dbg(bdma_chan->dchan.device->dev,
287 "desc %p not ACKed\n", tx_desc);
288 }
289
290 i = bdma_chan->wr_count_next % bdma_chan->bd_num;
291 if (i == bdma_chan->bd_num - 1) {
292 i = 0;
293 bdma_chan->wr_count_next++; /* skip link descriptor */
294 }
295
296 bdma_chan->wr_count_next++;
297 tx_desc->txd.phys = bdma_chan->bd_phys +
298 i * sizeof(struct tsi721_dma_desc);
299 tx_desc->hw_desc = &((struct tsi721_dma_desc *)bdma_chan->bd_base)[i];
300
301 spin_unlock_bh(&bdma_chan->lock);
302
303 return ret;
304}
305
306static int
307tsi721_fill_desc(struct tsi721_bdma_chan *bdma_chan,
308 struct tsi721_tx_desc *desc, struct scatterlist *sg,
309 enum dma_rtype rtype, u32 sys_size)
310{
311 struct tsi721_dma_desc *bd_ptr = desc->hw_desc;
312 u64 rio_addr;
313
314 if (sg_dma_len(sg) > TSI721_DMAD_BCOUNT1 + 1) {
315 dev_err(bdma_chan->dchan.device->dev,
316 "SG element is too large\n");
317 return -EINVAL;
318 }
319
320 dev_dbg(bdma_chan->dchan.device->dev,
321 "desc: 0x%llx, addr: 0x%llx len: 0x%x\n",
322 (u64)desc->txd.phys, (unsigned long long)sg_dma_address(sg),
323 sg_dma_len(sg));
324
325 dev_dbg(bdma_chan->dchan.device->dev,
326 "bd_ptr = %p did=%d raddr=0x%llx\n",
327 bd_ptr, desc->destid, desc->rio_addr);
328
329 /* Initialize DMA descriptor */
330 bd_ptr->type_id = cpu_to_le32((DTYPE1 << 29) |
331 (rtype << 19) | desc->destid);
332 if (desc->interrupt)
333 bd_ptr->type_id |= cpu_to_le32(TSI721_DMAD_IOF);
334 bd_ptr->bcount = cpu_to_le32(((desc->rio_addr & 0x3) << 30) |
335 (sys_size << 26) | sg_dma_len(sg));
336 rio_addr = (desc->rio_addr >> 2) |
337 ((u64)(desc->rio_addr_u & 0x3) << 62);
338 bd_ptr->raddr_lo = cpu_to_le32(rio_addr & 0xffffffff);
339 bd_ptr->raddr_hi = cpu_to_le32(rio_addr >> 32);
340 bd_ptr->t1.bufptr_lo = cpu_to_le32(
341 (u64)sg_dma_address(sg) & 0xffffffff);
342 bd_ptr->t1.bufptr_hi = cpu_to_le32((u64)sg_dma_address(sg) >> 32);
343 bd_ptr->t1.s_dist = 0;
344 bd_ptr->t1.s_size = 0;
345
346 return 0;
347}
348
349static void tsi721_dma_chain_complete(struct tsi721_bdma_chan *bdma_chan,
350 struct tsi721_tx_desc *desc)
351{
352 struct dma_async_tx_descriptor *txd = &desc->txd;
353 dma_async_tx_callback callback = txd->callback;
354 void *param = txd->callback_param;
355
356 list_splice_init(&desc->tx_list, &bdma_chan->free_list);
357 list_move(&desc->desc_node, &bdma_chan->free_list);
358 bdma_chan->completed_cookie = txd->cookie;
359
360 if (callback)
361 callback(param);
362}
363
364static void tsi721_dma_complete_all(struct tsi721_bdma_chan *bdma_chan)
365{
366 struct tsi721_tx_desc *desc, *_d;
367 LIST_HEAD(list);
368
369 BUG_ON(!tsi721_dma_is_idle(bdma_chan));
370
371 if (!list_empty(&bdma_chan->queue))
372 tsi721_start_dma(bdma_chan);
373
374 list_splice_init(&bdma_chan->active_list, &list);
375 list_splice_init(&bdma_chan->queue, &bdma_chan->active_list);
376
377 list_for_each_entry_safe(desc, _d, &list, desc_node)
378 tsi721_dma_chain_complete(bdma_chan, desc);
379}
380
381static void tsi721_clr_stat(struct tsi721_bdma_chan *bdma_chan)
382{
383 u32 srd_ptr;
384 u64 *sts_ptr;
385 int i, j;
386
387 /* Check and clear descriptor status FIFO entries */
388 srd_ptr = bdma_chan->sts_rdptr;
389 sts_ptr = bdma_chan->sts_base;
390 j = srd_ptr * 8;
391 while (sts_ptr[j]) {
392 for (i = 0; i < 8 && sts_ptr[j]; i++, j++)
393 sts_ptr[j] = 0;
394
395 ++srd_ptr;
396 srd_ptr %= bdma_chan->sts_size;
397 j = srd_ptr * 8;
398 }
399
400 iowrite32(srd_ptr, bdma_chan->regs + TSI721_DMAC_DSRP);
401 bdma_chan->sts_rdptr = srd_ptr;
402}
403
404static void tsi721_advance_work(struct tsi721_bdma_chan *bdma_chan)
405{
406 if (list_empty(&bdma_chan->active_list) ||
407 list_is_singular(&bdma_chan->active_list)) {
408 dev_dbg(bdma_chan->dchan.device->dev,
409 "%s: Active_list empty\n", __func__);
410 tsi721_dma_complete_all(bdma_chan);
411 } else {
412 dev_dbg(bdma_chan->dchan.device->dev,
413 "%s: Active_list NOT empty\n", __func__);
414 tsi721_dma_chain_complete(bdma_chan,
415 tsi721_dma_first_active(bdma_chan));
416 tsi721_start_dma(bdma_chan);
417 }
418}
419
420static void tsi721_dma_tasklet(unsigned long data)
421{
422 struct tsi721_bdma_chan *bdma_chan = (struct tsi721_bdma_chan *)data;
423 u32 dmac_int, dmac_sts;
424
425 dmac_int = ioread32(bdma_chan->regs + TSI721_DMAC_INT);
426 dev_dbg(bdma_chan->dchan.device->dev, "%s: DMAC%d_INT = 0x%x\n",
427 __func__, bdma_chan->id, dmac_int);
428 /* Clear channel interrupts */
429 iowrite32(dmac_int, bdma_chan->regs + TSI721_DMAC_INT);
430
431 if (dmac_int & TSI721_DMAC_INT_ERR) {
432 dmac_sts = ioread32(bdma_chan->regs + TSI721_DMAC_STS);
433 dev_err(bdma_chan->dchan.device->dev,
434 "%s: DMA ERROR - DMAC%d_STS = 0x%x\n",
435 __func__, bdma_chan->id, dmac_sts);
436 }
437
438 if (dmac_int & TSI721_DMAC_INT_STFULL) {
439 dev_err(bdma_chan->dchan.device->dev,
440 "%s: DMAC%d descriptor status FIFO is full\n",
441 __func__, bdma_chan->id);
442 }
443
444 if (dmac_int & (TSI721_DMAC_INT_DONE | TSI721_DMAC_INT_IOFDONE)) {
445 tsi721_clr_stat(bdma_chan);
446 spin_lock(&bdma_chan->lock);
447 tsi721_advance_work(bdma_chan);
448 spin_unlock(&bdma_chan->lock);
449 }
450
451 /* Re-Enable BDMA channel interrupts */
452 iowrite32(TSI721_DMAC_INT_ALL, bdma_chan->regs + TSI721_DMAC_INTE);
453}
454
455static dma_cookie_t tsi721_tx_submit(struct dma_async_tx_descriptor *txd)
456{
457 struct tsi721_tx_desc *desc = to_tsi721_desc(txd);
458 struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(txd->chan);
459 dma_cookie_t cookie;
460
461 spin_lock_bh(&bdma_chan->lock);
462
463 cookie = txd->chan->cookie;
464 if (++cookie < 0)
465 cookie = 1;
466 txd->chan->cookie = cookie;
467 txd->cookie = cookie;
468
469 if (list_empty(&bdma_chan->active_list)) {
470 list_add_tail(&desc->desc_node, &bdma_chan->active_list);
471 tsi721_start_dma(bdma_chan);
472 } else {
473 list_add_tail(&desc->desc_node, &bdma_chan->queue);
474 }
475
476 spin_unlock_bh(&bdma_chan->lock);
477 return cookie;
478}
479
480static int tsi721_alloc_chan_resources(struct dma_chan *dchan)
481{
482 struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
483#ifdef CONFIG_PCI_MSI
484 struct tsi721_device *priv = to_tsi721(dchan->device);
485#endif
486 struct tsi721_tx_desc *desc = NULL;
487 LIST_HEAD(tmp_list);
488 int i;
489 int rc;
490
491 if (bdma_chan->bd_base)
492 return bdma_chan->bd_num - 1;
493
494 /* Initialize BDMA channel */
495 if (tsi721_bdma_ch_init(bdma_chan)) {
496 dev_err(dchan->device->dev, "Unable to initialize data DMA"
497 " channel %d, aborting\n", bdma_chan->id);
498 return -ENOMEM;
499 }
500
501 /* Alocate matching number of logical descriptors */
502 desc = kcalloc((bdma_chan->bd_num - 1), sizeof(struct tsi721_tx_desc),
503 GFP_KERNEL);
504 if (!desc) {
505 dev_err(dchan->device->dev,
506 "Failed to allocate logical descriptors\n");
507 rc = -ENOMEM;
508 goto err_out;
509 }
510
511 bdma_chan->tx_desc = desc;
512
513 for (i = 0; i < bdma_chan->bd_num - 1; i++) {
514 dma_async_tx_descriptor_init(&desc[i].txd, dchan);
515 desc[i].txd.tx_submit = tsi721_tx_submit;
516 desc[i].txd.flags = DMA_CTRL_ACK;
517 INIT_LIST_HEAD(&desc[i].tx_list);
518 list_add_tail(&desc[i].desc_node, &tmp_list);
519 }
520
521 spin_lock_bh(&bdma_chan->lock);
522 list_splice(&tmp_list, &bdma_chan->free_list);
523 bdma_chan->completed_cookie = dchan->cookie = 1;
524 spin_unlock_bh(&bdma_chan->lock);
525
526#ifdef CONFIG_PCI_MSI
527 if (priv->flags & TSI721_USING_MSIX) {
528 /* Request interrupt service if we are in MSI-X mode */
529 rc = request_irq(
530 priv->msix[TSI721_VECT_DMA0_DONE +
531 bdma_chan->id].vector,
532 tsi721_bdma_msix, 0,
533 priv->msix[TSI721_VECT_DMA0_DONE +
534 bdma_chan->id].irq_name,
535 (void *)bdma_chan);
536
537 if (rc) {
538 dev_dbg(dchan->device->dev,
539 "Unable to allocate MSI-X interrupt for "
540 "BDMA%d-DONE\n", bdma_chan->id);
541 goto err_out;
542 }
543
544 rc = request_irq(priv->msix[TSI721_VECT_DMA0_INT +
545 bdma_chan->id].vector,
546 tsi721_bdma_msix, 0,
547 priv->msix[TSI721_VECT_DMA0_INT +
548 bdma_chan->id].irq_name,
549 (void *)bdma_chan);
550
551 if (rc) {
552 dev_dbg(dchan->device->dev,
553 "Unable to allocate MSI-X interrupt for "
554 "BDMA%d-INT\n", bdma_chan->id);
555 free_irq(
556 priv->msix[TSI721_VECT_DMA0_DONE +
557 bdma_chan->id].vector,
558 (void *)bdma_chan);
559 rc = -EIO;
560 goto err_out;
561 }
562 }
563#endif /* CONFIG_PCI_MSI */
564
565 tasklet_enable(&bdma_chan->tasklet);
566 tsi721_bdma_interrupt_enable(bdma_chan, 1);
567
568 return bdma_chan->bd_num - 1;
569
570err_out:
571 kfree(desc);
572 tsi721_bdma_ch_free(bdma_chan);
573 return rc;
574}
575
576static void tsi721_free_chan_resources(struct dma_chan *dchan)
577{
578 struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
579#ifdef CONFIG_PCI_MSI
580 struct tsi721_device *priv = to_tsi721(dchan->device);
581#endif
582 LIST_HEAD(list);
583
584 dev_dbg(dchan->device->dev, "%s: Entry\n", __func__);
585
586 if (bdma_chan->bd_base == NULL)
587 return;
588
589 BUG_ON(!list_empty(&bdma_chan->active_list));
590 BUG_ON(!list_empty(&bdma_chan->queue));
591
592 tasklet_disable(&bdma_chan->tasklet);
593
594 spin_lock_bh(&bdma_chan->lock);
595 list_splice_init(&bdma_chan->free_list, &list);
596 spin_unlock_bh(&bdma_chan->lock);
597
598 tsi721_bdma_interrupt_enable(bdma_chan, 0);
599
600#ifdef CONFIG_PCI_MSI
601 if (priv->flags & TSI721_USING_MSIX) {
602 free_irq(priv->msix[TSI721_VECT_DMA0_DONE +
603 bdma_chan->id].vector, (void *)bdma_chan);
604 free_irq(priv->msix[TSI721_VECT_DMA0_INT +
605 bdma_chan->id].vector, (void *)bdma_chan);
606 }
607#endif /* CONFIG_PCI_MSI */
608
609 tsi721_bdma_ch_free(bdma_chan);
610 kfree(bdma_chan->tx_desc);
611}
612
613static
614enum dma_status tsi721_tx_status(struct dma_chan *dchan, dma_cookie_t cookie,
615 struct dma_tx_state *txstate)
616{
617 struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
618 dma_cookie_t last_used;
619 dma_cookie_t last_completed;
620 int ret;
621
622 spin_lock_bh(&bdma_chan->lock);
623 last_completed = bdma_chan->completed_cookie;
624 last_used = dchan->cookie;
625 spin_unlock_bh(&bdma_chan->lock);
626
627 ret = dma_async_is_complete(cookie, last_completed, last_used);
628
629 dma_set_tx_state(txstate, last_completed, last_used, 0);
630
631 dev_dbg(dchan->device->dev,
632 "%s: exit, ret: %d, last_completed: %d, last_used: %d\n",
633 __func__, ret, last_completed, last_used);
634
635 return ret;
636}
637
638static void tsi721_issue_pending(struct dma_chan *dchan)
639{
640 struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
641
642 dev_dbg(dchan->device->dev, "%s: Entry\n", __func__);
643
644 if (tsi721_dma_is_idle(bdma_chan)) {
645 spin_lock_bh(&bdma_chan->lock);
646 tsi721_advance_work(bdma_chan);
647 spin_unlock_bh(&bdma_chan->lock);
648 } else
649 dev_dbg(dchan->device->dev,
650 "%s: DMA channel still busy\n", __func__);
651}
652
653static
654struct dma_async_tx_descriptor *tsi721_prep_rio_sg(struct dma_chan *dchan,
655 struct scatterlist *sgl, unsigned int sg_len,
656 enum dma_transfer_direction dir, unsigned long flags,
657 void *tinfo)
658{
659 struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
660 struct tsi721_tx_desc *desc = NULL;
661 struct tsi721_tx_desc *first = NULL;
662 struct scatterlist *sg;
663 struct rio_dma_ext *rext = tinfo;
664 u64 rio_addr = rext->rio_addr; /* limited to 64-bit rio_addr for now */
665 unsigned int i;
666 u32 sys_size = dma_to_mport(dchan->device)->sys_size;
667 enum dma_rtype rtype;
668
669 if (!sgl || !sg_len) {
670 dev_err(dchan->device->dev, "%s: No SG list\n", __func__);
671 return NULL;
672 }
673
674 if (dir == DMA_DEV_TO_MEM)
675 rtype = NREAD;
676 else if (dir == DMA_MEM_TO_DEV) {
677 switch (rext->wr_type) {
678 case RDW_ALL_NWRITE:
679 rtype = ALL_NWRITE;
680 break;
681 case RDW_ALL_NWRITE_R:
682 rtype = ALL_NWRITE_R;
683 break;
684 case RDW_LAST_NWRITE_R:
685 default:
686 rtype = LAST_NWRITE_R;
687 break;
688 }
689 } else {
690 dev_err(dchan->device->dev,
691 "%s: Unsupported DMA direction option\n", __func__);
692 return NULL;
693 }
694
695 for_each_sg(sgl, sg, sg_len, i) {
696 int err;
697
698 dev_dbg(dchan->device->dev, "%s: sg #%d\n", __func__, i);
699 desc = tsi721_desc_get(bdma_chan);
700 if (!desc) {
701 dev_err(dchan->device->dev,
702 "Not enough descriptors available\n");
703 goto err_desc_get;
704 }
705
706 if (sg_is_last(sg))
707 desc->interrupt = (flags & DMA_PREP_INTERRUPT) != 0;
708 else
709 desc->interrupt = false;
710
711 desc->destid = rext->destid;
712 desc->rio_addr = rio_addr;
713 desc->rio_addr_u = 0;
714
715 err = tsi721_fill_desc(bdma_chan, desc, sg, rtype, sys_size);
716 if (err) {
717 dev_err(dchan->device->dev,
718 "Failed to build desc: %d\n", err);
719 goto err_desc_get;
720 }
721
722 rio_addr += sg_dma_len(sg);
723
724 if (!first)
725 first = desc;
726 else
727 list_add_tail(&desc->desc_node, &first->tx_list);
728 }
729
730 first->txd.cookie = -EBUSY;
731 desc->txd.flags = flags;
732
733 return &first->txd;
734
735err_desc_get:
736 tsi721_desc_put(bdma_chan, first);
737 return NULL;
738}
739
740static int tsi721_device_control(struct dma_chan *dchan, enum dma_ctrl_cmd cmd,
741 unsigned long arg)
742{
743 struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
744 struct tsi721_tx_desc *desc, *_d;
745 LIST_HEAD(list);
746
747 dev_dbg(dchan->device->dev, "%s: Entry\n", __func__);
748
749 if (cmd != DMA_TERMINATE_ALL)
750 return -ENXIO;
751
752 spin_lock_bh(&bdma_chan->lock);
753
754 /* make sure to stop the transfer */
755 iowrite32(TSI721_DMAC_CTL_SUSP, bdma_chan->regs + TSI721_DMAC_CTL);
756
757 list_splice_init(&bdma_chan->active_list, &list);
758 list_splice_init(&bdma_chan->queue, &list);
759
760 list_for_each_entry_safe(desc, _d, &list, desc_node)
761 tsi721_dma_chain_complete(bdma_chan, desc);
762
763 spin_unlock_bh(&bdma_chan->lock);
764
765 return 0;
766}
767
768int __devinit tsi721_register_dma(struct tsi721_device *priv)
769{
770 int i;
771 int nr_channels = TSI721_DMA_MAXCH;
772 int err;
773 struct rio_mport *mport = priv->mport;
774
775 mport->dma.dev = &priv->pdev->dev;
776 mport->dma.chancnt = nr_channels;
777
778 INIT_LIST_HEAD(&mport->dma.channels);
779
780 for (i = 0; i < nr_channels; i++) {
781 struct tsi721_bdma_chan *bdma_chan = &priv->bdma[i];
782
783 if (i == TSI721_DMACH_MAINT)
784 continue;
785
786 bdma_chan->bd_num = 64;
787 bdma_chan->regs = priv->regs + TSI721_DMAC_BASE(i);
788
789 bdma_chan->dchan.device = &mport->dma;
790 bdma_chan->dchan.cookie = 1;
791 bdma_chan->dchan.chan_id = i;
792 bdma_chan->id = i;
793
794 spin_lock_init(&bdma_chan->lock);
795
796 INIT_LIST_HEAD(&bdma_chan->active_list);
797 INIT_LIST_HEAD(&bdma_chan->queue);
798 INIT_LIST_HEAD(&bdma_chan->free_list);
799
800 tasklet_init(&bdma_chan->tasklet, tsi721_dma_tasklet,
801 (unsigned long)bdma_chan);
802 tasklet_disable(&bdma_chan->tasklet);
803 list_add_tail(&bdma_chan->dchan.device_node,
804 &mport->dma.channels);
805 }
806
807 dma_cap_zero(mport->dma.cap_mask);
808 dma_cap_set(DMA_PRIVATE, mport->dma.cap_mask);
809 dma_cap_set(DMA_SLAVE, mport->dma.cap_mask);
810
811 mport->dma.device_alloc_chan_resources = tsi721_alloc_chan_resources;
812 mport->dma.device_free_chan_resources = tsi721_free_chan_resources;
813 mport->dma.device_tx_status = tsi721_tx_status;
814 mport->dma.device_issue_pending = tsi721_issue_pending;
815 mport->dma.device_prep_slave_sg = tsi721_prep_rio_sg;
816 mport->dma.device_control = tsi721_device_control;
817
818 err = dma_async_device_register(&mport->dma);
819 if (err)
820 dev_err(&priv->pdev->dev, "Failed to register DMA device\n");
821
822 return err;
823}
Linux 6.x block layer and io_uring tree(s)