1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015, Michael Lee <igvtee@gmail.com>
4 * MTK HSDMA support
5 */
6
7 #include <linux/dmaengine.h>
8 #include <linux/dma-mapping.h>
9 #include <linux/err.h>
10 #include <linux/init.h>
11 #include <linux/list.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/slab.h>
15 #include <linux/spinlock.h>
16 #include <linux/irq.h>
17 #include <linux/of_dma.h>
18 #include <linux/reset.h>
19 #include <linux/of_device.h>
20
21 #include "virt-dma.h"
22
23 #define HSDMA_BASE_OFFSET 0x800
24
25 #define HSDMA_REG_TX_BASE 0x00
26 #define HSDMA_REG_TX_CNT 0x04
27 #define HSDMA_REG_TX_CTX 0x08
28 #define HSDMA_REG_TX_DTX 0x0c
29 #define HSDMA_REG_RX_BASE 0x100
30 #define HSDMA_REG_RX_CNT 0x104
31 #define HSDMA_REG_RX_CRX 0x108
32 #define HSDMA_REG_RX_DRX 0x10c
33 #define HSDMA_REG_INFO 0x200
34 #define HSDMA_REG_GLO_CFG 0x204
35 #define HSDMA_REG_RST_CFG 0x208
36 #define HSDMA_REG_DELAY_INT 0x20c
37 #define HSDMA_REG_FREEQ_THRES 0x210
38 #define HSDMA_REG_INT_STATUS 0x220
39 #define HSDMA_REG_INT_MASK 0x228
40 #define HSDMA_REG_SCH_Q01 0x280
41 #define HSDMA_REG_SCH_Q23 0x284
42
43 #define HSDMA_DESCS_MAX 0xfff
44 #define HSDMA_DESCS_NUM 8
45 #define HSDMA_DESCS_MASK (HSDMA_DESCS_NUM - 1)
46 #define HSDMA_NEXT_DESC(x) (((x) + 1) & HSDMA_DESCS_MASK)
47
48 /* HSDMA_REG_INFO */
49 #define HSDMA_INFO_INDEX_MASK 0xf
50 #define HSDMA_INFO_INDEX_SHIFT 24
51 #define HSDMA_INFO_BASE_MASK 0xff
52 #define HSDMA_INFO_BASE_SHIFT 16
53 #define HSDMA_INFO_RX_MASK 0xff
54 #define HSDMA_INFO_RX_SHIFT 8
55 #define HSDMA_INFO_TX_MASK 0xff
56 #define HSDMA_INFO_TX_SHIFT 0
57
58 /* HSDMA_REG_GLO_CFG */
59 #define HSDMA_GLO_TX_2B_OFFSET BIT(31)
60 #define HSDMA_GLO_CLK_GATE BIT(30)
61 #define HSDMA_GLO_BYTE_SWAP BIT(29)
62 #define HSDMA_GLO_MULTI_DMA BIT(10)
63 #define HSDMA_GLO_TWO_BUF BIT(9)
64 #define HSDMA_GLO_32B_DESC BIT(8)
65 #define HSDMA_GLO_BIG_ENDIAN BIT(7)
66 #define HSDMA_GLO_TX_DONE BIT(6)
67 #define HSDMA_GLO_BT_MASK 0x3
68 #define HSDMA_GLO_BT_SHIFT 4
69 #define HSDMA_GLO_RX_BUSY BIT(3)
70 #define HSDMA_GLO_RX_DMA BIT(2)
71 #define HSDMA_GLO_TX_BUSY BIT(1)
72 #define HSDMA_GLO_TX_DMA BIT(0)
73
74 #define HSDMA_BT_SIZE_16BYTES (0 << HSDMA_GLO_BT_SHIFT)
75 #define HSDMA_BT_SIZE_32BYTES (1 << HSDMA_GLO_BT_SHIFT)
76 #define HSDMA_BT_SIZE_64BYTES (2 << HSDMA_GLO_BT_SHIFT)
77 #define HSDMA_BT_SIZE_128BYTES (3 << HSDMA_GLO_BT_SHIFT)
78
79 #define HSDMA_GLO_DEFAULT (HSDMA_GLO_MULTI_DMA | \
80 HSDMA_GLO_RX_DMA | HSDMA_GLO_TX_DMA | HSDMA_BT_SIZE_32BYTES)
81
82 /* HSDMA_REG_RST_CFG */
83 #define HSDMA_RST_RX_SHIFT 16
84 #define HSDMA_RST_TX_SHIFT 0
85
86 /* HSDMA_REG_DELAY_INT */
87 #define HSDMA_DELAY_INT_EN BIT(15)
88 #define HSDMA_DELAY_PEND_OFFSET 8
89 #define HSDMA_DELAY_TIME_OFFSET 0
90 #define HSDMA_DELAY_TX_OFFSET 16
91 #define HSDMA_DELAY_RX_OFFSET 0
92
93 #define HSDMA_DELAY_INIT(x) (HSDMA_DELAY_INT_EN | \
94 ((x) << HSDMA_DELAY_PEND_OFFSET))
95 #define HSDMA_DELAY(x) ((HSDMA_DELAY_INIT(x) << \
96 HSDMA_DELAY_TX_OFFSET) | HSDMA_DELAY_INIT(x))
97
98 /* HSDMA_REG_INT_STATUS */
99 #define HSDMA_INT_DELAY_RX_COH BIT(31)
100 #define HSDMA_INT_DELAY_RX_INT BIT(30)
101 #define HSDMA_INT_DELAY_TX_COH BIT(29)
102 #define HSDMA_INT_DELAY_TX_INT BIT(28)
103 #define HSDMA_INT_RX_MASK 0x3
104 #define HSDMA_INT_RX_SHIFT 16
105 #define HSDMA_INT_RX_Q0 BIT(16)
106 #define HSDMA_INT_TX_MASK 0xf
107 #define HSDMA_INT_TX_SHIFT 0
108 #define HSDMA_INT_TX_Q0 BIT(0)
109
110 /* tx/rx dma desc flags */
111 #define HSDMA_PLEN_MASK 0x3fff
112 #define HSDMA_DESC_DONE BIT(31)
113 #define HSDMA_DESC_LS0 BIT(30)
114 #define HSDMA_DESC_PLEN0(_x) (((_x) & HSDMA_PLEN_MASK) << 16)
115 #define HSDMA_DESC_TAG BIT(15)
116 #define HSDMA_DESC_LS1 BIT(14)
117 #define HSDMA_DESC_PLEN1(_x) ((_x) & HSDMA_PLEN_MASK)
118
119 /* align 4 bytes */
120 #define HSDMA_ALIGN_SIZE 3
121 /* align size 128bytes */
122 #define HSDMA_MAX_PLEN 0x3f80
123
124 struct hsdma_desc {
125 u32 addr0;
126 u32 flags;
127 u32 addr1;
128 u32 unused;
129 };
130
131 struct mtk_hsdma_sg {
132 dma_addr_t src_addr;
133 dma_addr_t dst_addr;
134 u32 len;
135 };
136
137 struct mtk_hsdma_desc {
138 struct virt_dma_desc vdesc;
139 unsigned int num_sgs;
140 struct mtk_hsdma_sg sg[1];
141 };
142
143 struct mtk_hsdma_chan {
144 struct virt_dma_chan vchan;
145 unsigned int id;
146 dma_addr_t desc_addr;
147 int tx_idx;
148 int rx_idx;
149 struct hsdma_desc *tx_ring;
150 struct hsdma_desc *rx_ring;
151 struct mtk_hsdma_desc *desc;
152 unsigned int next_sg;
153 };
154
155 struct mtk_hsdam_engine {
156 struct dma_device ddev;
157 struct device_dma_parameters dma_parms;
158 void __iomem *base;
159 struct tasklet_struct task;
160 volatile unsigned long chan_issued;
161
162 struct mtk_hsdma_chan chan[1];
163 };
164
mtk_hsdma_chan_get_dev(struct mtk_hsdma_chan * chan)165 static inline struct mtk_hsdam_engine *mtk_hsdma_chan_get_dev(
166 struct mtk_hsdma_chan *chan)
167 {
168 return container_of(chan->vchan.chan.device, struct mtk_hsdam_engine,
169 ddev);
170 }
171
to_mtk_hsdma_chan(struct dma_chan * c)172 static inline struct mtk_hsdma_chan *to_mtk_hsdma_chan(struct dma_chan *c)
173 {
174 return container_of(c, struct mtk_hsdma_chan, vchan.chan);
175 }
176
to_mtk_hsdma_desc(struct virt_dma_desc * vdesc)177 static inline struct mtk_hsdma_desc *to_mtk_hsdma_desc(
178 struct virt_dma_desc *vdesc)
179 {
180 return container_of(vdesc, struct mtk_hsdma_desc, vdesc);
181 }
182
mtk_hsdma_read(struct mtk_hsdam_engine * hsdma,u32 reg)183 static inline u32 mtk_hsdma_read(struct mtk_hsdam_engine *hsdma, u32 reg)
184 {
185 return readl(hsdma->base + reg);
186 }
187
mtk_hsdma_write(struct mtk_hsdam_engine * hsdma,unsigned int reg,u32 val)188 static inline void mtk_hsdma_write(struct mtk_hsdam_engine *hsdma,
189 unsigned int reg, u32 val)
190 {
191 writel(val, hsdma->base + reg);
192 }
193
mtk_hsdma_reset_chan(struct mtk_hsdam_engine * hsdma,struct mtk_hsdma_chan * chan)194 static void mtk_hsdma_reset_chan(struct mtk_hsdam_engine *hsdma,
195 struct mtk_hsdma_chan *chan)
196 {
197 chan->tx_idx = 0;
198 chan->rx_idx = HSDMA_DESCS_NUM - 1;
199
200 mtk_hsdma_write(hsdma, HSDMA_REG_TX_CTX, chan->tx_idx);
201 mtk_hsdma_write(hsdma, HSDMA_REG_RX_CRX, chan->rx_idx);
202
203 mtk_hsdma_write(hsdma, HSDMA_REG_RST_CFG,
204 0x1 << (chan->id + HSDMA_RST_TX_SHIFT));
205 mtk_hsdma_write(hsdma, HSDMA_REG_RST_CFG,
206 0x1 << (chan->id + HSDMA_RST_RX_SHIFT));
207 }
208
hsdma_dump_reg(struct mtk_hsdam_engine * hsdma)209 static void hsdma_dump_reg(struct mtk_hsdam_engine *hsdma)
210 {
211 dev_dbg(hsdma->ddev.dev,
212 "tbase %08x, tcnt %08x, tctx %08x, tdtx: %08x, rbase %08x, rcnt %08x, rctx %08x, rdtx %08x\n",
213 mtk_hsdma_read(hsdma, HSDMA_REG_TX_BASE),
214 mtk_hsdma_read(hsdma, HSDMA_REG_TX_CNT),
215 mtk_hsdma_read(hsdma, HSDMA_REG_TX_CTX),
216 mtk_hsdma_read(hsdma, HSDMA_REG_TX_DTX),
217 mtk_hsdma_read(hsdma, HSDMA_REG_RX_BASE),
218 mtk_hsdma_read(hsdma, HSDMA_REG_RX_CNT),
219 mtk_hsdma_read(hsdma, HSDMA_REG_RX_CRX),
220 mtk_hsdma_read(hsdma, HSDMA_REG_RX_DRX));
221
222 dev_dbg(hsdma->ddev.dev,
223 "info %08x, glo %08x, delay %08x, intr_stat %08x, intr_mask %08x\n",
224 mtk_hsdma_read(hsdma, HSDMA_REG_INFO),
225 mtk_hsdma_read(hsdma, HSDMA_REG_GLO_CFG),
226 mtk_hsdma_read(hsdma, HSDMA_REG_DELAY_INT),
227 mtk_hsdma_read(hsdma, HSDMA_REG_INT_STATUS),
228 mtk_hsdma_read(hsdma, HSDMA_REG_INT_MASK));
229 }
230
hsdma_dump_desc(struct mtk_hsdam_engine * hsdma,struct mtk_hsdma_chan * chan)231 static void hsdma_dump_desc(struct mtk_hsdam_engine *hsdma,
232 struct mtk_hsdma_chan *chan)
233 {
234 struct hsdma_desc *tx_desc;
235 struct hsdma_desc *rx_desc;
236 int i;
237
238 dev_dbg(hsdma->ddev.dev, "tx idx: %d, rx idx: %d\n",
239 chan->tx_idx, chan->rx_idx);
240
241 for (i = 0; i < HSDMA_DESCS_NUM; i++) {
242 tx_desc = &chan->tx_ring[i];
243 rx_desc = &chan->rx_ring[i];
244
245 dev_dbg(hsdma->ddev.dev,
246 "%d tx addr0: %08x, flags %08x, tx addr1: %08x, rx addr0 %08x, flags %08x\n",
247 i, tx_desc->addr0, tx_desc->flags,
248 tx_desc->addr1, rx_desc->addr0, rx_desc->flags);
249 }
250 }
251
mtk_hsdma_reset(struct mtk_hsdam_engine * hsdma,struct mtk_hsdma_chan * chan)252 static void mtk_hsdma_reset(struct mtk_hsdam_engine *hsdma,
253 struct mtk_hsdma_chan *chan)
254 {
255 int i;
256
257 /* disable dma */
258 mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, 0);
259
260 /* disable intr */
261 mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, 0);
262
263 /* init desc value */
264 for (i = 0; i < HSDMA_DESCS_NUM; i++) {
265 chan->tx_ring[i].addr0 = 0;
266 chan->tx_ring[i].flags = HSDMA_DESC_LS0 | HSDMA_DESC_DONE;
267 }
268 for (i = 0; i < HSDMA_DESCS_NUM; i++) {
269 chan->rx_ring[i].addr0 = 0;
270 chan->rx_ring[i].flags = 0;
271 }
272
273 /* reset */
274 mtk_hsdma_reset_chan(hsdma, chan);
275
276 /* enable intr */
277 mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, HSDMA_INT_RX_Q0);
278
279 /* enable dma */
280 mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, HSDMA_GLO_DEFAULT);
281 }
282
mtk_hsdma_terminate_all(struct dma_chan * c)283 static int mtk_hsdma_terminate_all(struct dma_chan *c)
284 {
285 struct mtk_hsdma_chan *chan = to_mtk_hsdma_chan(c);
286 struct mtk_hsdam_engine *hsdma = mtk_hsdma_chan_get_dev(chan);
287 unsigned long timeout;
288 LIST_HEAD(head);
289
290 spin_lock_bh(&chan->vchan.lock);
291 chan->desc = NULL;
292 clear_bit(chan->id, &hsdma->chan_issued);
293 vchan_get_all_descriptors(&chan->vchan, &head);
294 spin_unlock_bh(&chan->vchan.lock);
295
296 vchan_dma_desc_free_list(&chan->vchan, &head);
297
298 /* wait dma transfer complete */
299 timeout = jiffies + msecs_to_jiffies(2000);
300 while (mtk_hsdma_read(hsdma, HSDMA_REG_GLO_CFG) &
301 (HSDMA_GLO_RX_BUSY | HSDMA_GLO_TX_BUSY)) {
302 if (time_after_eq(jiffies, timeout)) {
303 hsdma_dump_desc(hsdma, chan);
304 mtk_hsdma_reset(hsdma, chan);
305 dev_err(hsdma->ddev.dev, "timeout, reset it\n");
306 break;
307 }
308 cpu_relax();
309 }
310
311 return 0;
312 }
313
mtk_hsdma_start_transfer(struct mtk_hsdam_engine * hsdma,struct mtk_hsdma_chan * chan)314 static int mtk_hsdma_start_transfer(struct mtk_hsdam_engine *hsdma,
315 struct mtk_hsdma_chan *chan)
316 {
317 dma_addr_t src, dst;
318 size_t len, tlen;
319 struct hsdma_desc *tx_desc, *rx_desc;
320 struct mtk_hsdma_sg *sg;
321 unsigned int i;
322 int rx_idx;
323
324 sg = &chan->desc->sg[0];
325 len = sg->len;
326 chan->desc->num_sgs = DIV_ROUND_UP(len, HSDMA_MAX_PLEN);
327
328 /* tx desc */
329 src = sg->src_addr;
330 for (i = 0; i < chan->desc->num_sgs; i++) {
331 tx_desc = &chan->tx_ring[chan->tx_idx];
332
333 if (len > HSDMA_MAX_PLEN)
334 tlen = HSDMA_MAX_PLEN;
335 else
336 tlen = len;
337
338 if (i & 0x1) {
339 tx_desc->addr1 = src;
340 tx_desc->flags |= HSDMA_DESC_PLEN1(tlen);
341 } else {
342 tx_desc->addr0 = src;
343 tx_desc->flags = HSDMA_DESC_PLEN0(tlen);
344
345 /* update index */
346 chan->tx_idx = HSDMA_NEXT_DESC(chan->tx_idx);
347 }
348
349 src += tlen;
350 len -= tlen;
351 }
352 if (i & 0x1)
353 tx_desc->flags |= HSDMA_DESC_LS0;
354 else
355 tx_desc->flags |= HSDMA_DESC_LS1;
356
357 /* rx desc */
358 rx_idx = HSDMA_NEXT_DESC(chan->rx_idx);
359 len = sg->len;
360 dst = sg->dst_addr;
361 for (i = 0; i < chan->desc->num_sgs; i++) {
362 rx_desc = &chan->rx_ring[rx_idx];
363 if (len > HSDMA_MAX_PLEN)
364 tlen = HSDMA_MAX_PLEN;
365 else
366 tlen = len;
367
368 rx_desc->addr0 = dst;
369 rx_desc->flags = HSDMA_DESC_PLEN0(tlen);
370
371 dst += tlen;
372 len -= tlen;
373
374 /* update index */
375 rx_idx = HSDMA_NEXT_DESC(rx_idx);
376 }
377
378 /* make sure desc and index all up to date */
379 wmb();
380 mtk_hsdma_write(hsdma, HSDMA_REG_TX_CTX, chan->tx_idx);
381
382 return 0;
383 }
384
gdma_next_desc(struct mtk_hsdma_chan * chan)385 static int gdma_next_desc(struct mtk_hsdma_chan *chan)
386 {
387 struct virt_dma_desc *vdesc;
388
389 vdesc = vchan_next_desc(&chan->vchan);
390 if (!vdesc) {
391 chan->desc = NULL;
392 return 0;
393 }
394 chan->desc = to_mtk_hsdma_desc(vdesc);
395 chan->next_sg = 0;
396
397 return 1;
398 }
399
mtk_hsdma_chan_done(struct mtk_hsdam_engine * hsdma,struct mtk_hsdma_chan * chan)400 static void mtk_hsdma_chan_done(struct mtk_hsdam_engine *hsdma,
401 struct mtk_hsdma_chan *chan)
402 {
403 struct mtk_hsdma_desc *desc;
404 int chan_issued;
405
406 chan_issued = 0;
407 spin_lock_bh(&chan->vchan.lock);
408 desc = chan->desc;
409 if (likely(desc)) {
410 if (chan->next_sg == desc->num_sgs) {
411 list_del(&desc->vdesc.node);
412 vchan_cookie_complete(&desc->vdesc);
413 chan_issued = gdma_next_desc(chan);
414 }
415 } else {
416 dev_dbg(hsdma->ddev.dev, "no desc to complete\n");
417 }
418
419 if (chan_issued)
420 set_bit(chan->id, &hsdma->chan_issued);
421 spin_unlock_bh(&chan->vchan.lock);
422 }
423
mtk_hsdma_irq(int irq,void * devid)424 static irqreturn_t mtk_hsdma_irq(int irq, void *devid)
425 {
426 struct mtk_hsdam_engine *hsdma = devid;
427 u32 status;
428
429 status = mtk_hsdma_read(hsdma, HSDMA_REG_INT_STATUS);
430 if (unlikely(!status))
431 return IRQ_NONE;
432
433 if (likely(status & HSDMA_INT_RX_Q0))
434 tasklet_schedule(&hsdma->task);
435 else
436 dev_dbg(hsdma->ddev.dev, "unhandle irq status %08x\n", status);
437 /* clean intr bits */
438 mtk_hsdma_write(hsdma, HSDMA_REG_INT_STATUS, status);
439
440 return IRQ_HANDLED;
441 }
442
mtk_hsdma_issue_pending(struct dma_chan * c)443 static void mtk_hsdma_issue_pending(struct dma_chan *c)
444 {
445 struct mtk_hsdma_chan *chan = to_mtk_hsdma_chan(c);
446 struct mtk_hsdam_engine *hsdma = mtk_hsdma_chan_get_dev(chan);
447
448 spin_lock_bh(&chan->vchan.lock);
449 if (vchan_issue_pending(&chan->vchan) && !chan->desc) {
450 if (gdma_next_desc(chan)) {
451 set_bit(chan->id, &hsdma->chan_issued);
452 tasklet_schedule(&hsdma->task);
453 } else {
454 dev_dbg(hsdma->ddev.dev, "no desc to issue\n");
455 }
456 }
457 spin_unlock_bh(&chan->vchan.lock);
458 }
459
mtk_hsdma_prep_dma_memcpy(struct dma_chan * c,dma_addr_t dest,dma_addr_t src,size_t len,unsigned long flags)460 static struct dma_async_tx_descriptor *mtk_hsdma_prep_dma_memcpy(
461 struct dma_chan *c, dma_addr_t dest, dma_addr_t src,
462 size_t len, unsigned long flags)
463 {
464 struct mtk_hsdma_chan *chan = to_mtk_hsdma_chan(c);
465 struct mtk_hsdma_desc *desc;
466
467 if (len <= 0)
468 return NULL;
469
470 desc = kzalloc(sizeof(*desc), GFP_ATOMIC);
471 if (!desc) {
472 dev_err(c->device->dev, "alloc memcpy decs error\n");
473 return NULL;
474 }
475
476 desc->sg[0].src_addr = src;
477 desc->sg[0].dst_addr = dest;
478 desc->sg[0].len = len;
479
480 return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
481 }
482
mtk_hsdma_tx_status(struct dma_chan * c,dma_cookie_t cookie,struct dma_tx_state * state)483 static enum dma_status mtk_hsdma_tx_status(struct dma_chan *c,
484 dma_cookie_t cookie,
485 struct dma_tx_state *state)
486 {
487 return dma_cookie_status(c, cookie, state);
488 }
489
mtk_hsdma_free_chan_resources(struct dma_chan * c)490 static void mtk_hsdma_free_chan_resources(struct dma_chan *c)
491 {
492 vchan_free_chan_resources(to_virt_chan(c));
493 }
494
mtk_hsdma_desc_free(struct virt_dma_desc * vdesc)495 static void mtk_hsdma_desc_free(struct virt_dma_desc *vdesc)
496 {
497 kfree(container_of(vdesc, struct mtk_hsdma_desc, vdesc));
498 }
499
mtk_hsdma_tx(struct mtk_hsdam_engine * hsdma)500 static void mtk_hsdma_tx(struct mtk_hsdam_engine *hsdma)
501 {
502 struct mtk_hsdma_chan *chan;
503
504 if (test_and_clear_bit(0, &hsdma->chan_issued)) {
505 chan = &hsdma->chan[0];
506 if (chan->desc)
507 mtk_hsdma_start_transfer(hsdma, chan);
508 else
509 dev_dbg(hsdma->ddev.dev, "chan 0 no desc to issue\n");
510 }
511 }
512
mtk_hsdma_rx(struct mtk_hsdam_engine * hsdma)513 static void mtk_hsdma_rx(struct mtk_hsdam_engine *hsdma)
514 {
515 struct mtk_hsdma_chan *chan;
516 int next_idx, drx_idx, cnt;
517
518 chan = &hsdma->chan[0];
519 next_idx = HSDMA_NEXT_DESC(chan->rx_idx);
520 drx_idx = mtk_hsdma_read(hsdma, HSDMA_REG_RX_DRX);
521
522 cnt = (drx_idx - next_idx) & HSDMA_DESCS_MASK;
523 if (!cnt)
524 return;
525
526 chan->next_sg += cnt;
527 chan->rx_idx = (chan->rx_idx + cnt) & HSDMA_DESCS_MASK;
528
529 /* update rx crx */
530 wmb();
531 mtk_hsdma_write(hsdma, HSDMA_REG_RX_CRX, chan->rx_idx);
532
533 mtk_hsdma_chan_done(hsdma, chan);
534 }
535
mtk_hsdma_tasklet(struct tasklet_struct * t)536 static void mtk_hsdma_tasklet(struct tasklet_struct *t)
537 {
538 struct mtk_hsdam_engine *hsdma = from_tasklet(hsdma, t, task);
539
540 mtk_hsdma_rx(hsdma);
541 mtk_hsdma_tx(hsdma);
542 }
543
mtk_hsdam_alloc_desc(struct mtk_hsdam_engine * hsdma,struct mtk_hsdma_chan * chan)544 static int mtk_hsdam_alloc_desc(struct mtk_hsdam_engine *hsdma,
545 struct mtk_hsdma_chan *chan)
546 {
547 int i;
548
549 chan->tx_ring = dma_alloc_coherent(hsdma->ddev.dev,
550 2 * HSDMA_DESCS_NUM *
551 sizeof(*chan->tx_ring),
552 &chan->desc_addr, GFP_ATOMIC | __GFP_ZERO);
553 if (!chan->tx_ring)
554 goto no_mem;
555
556 chan->rx_ring = &chan->tx_ring[HSDMA_DESCS_NUM];
557
558 /* init tx ring value */
559 for (i = 0; i < HSDMA_DESCS_NUM; i++)
560 chan->tx_ring[i].flags = HSDMA_DESC_LS0 | HSDMA_DESC_DONE;
561
562 return 0;
563 no_mem:
564 return -ENOMEM;
565 }
566
mtk_hsdam_free_desc(struct mtk_hsdam_engine * hsdma,struct mtk_hsdma_chan * chan)567 static void mtk_hsdam_free_desc(struct mtk_hsdam_engine *hsdma,
568 struct mtk_hsdma_chan *chan)
569 {
570 if (chan->tx_ring) {
571 dma_free_coherent(hsdma->ddev.dev,
572 2 * HSDMA_DESCS_NUM * sizeof(*chan->tx_ring),
573 chan->tx_ring, chan->desc_addr);
574 chan->tx_ring = NULL;
575 chan->rx_ring = NULL;
576 }
577 }
578
mtk_hsdma_init(struct mtk_hsdam_engine * hsdma)579 static int mtk_hsdma_init(struct mtk_hsdam_engine *hsdma)
580 {
581 struct mtk_hsdma_chan *chan;
582 int ret;
583 u32 reg;
584
585 /* init desc */
586 chan = &hsdma->chan[0];
587 ret = mtk_hsdam_alloc_desc(hsdma, chan);
588 if (ret)
589 return ret;
590
591 /* tx */
592 mtk_hsdma_write(hsdma, HSDMA_REG_TX_BASE, chan->desc_addr);
593 mtk_hsdma_write(hsdma, HSDMA_REG_TX_CNT, HSDMA_DESCS_NUM);
594 /* rx */
595 mtk_hsdma_write(hsdma, HSDMA_REG_RX_BASE, chan->desc_addr +
596 (sizeof(struct hsdma_desc) * HSDMA_DESCS_NUM));
597 mtk_hsdma_write(hsdma, HSDMA_REG_RX_CNT, HSDMA_DESCS_NUM);
598 /* reset */
599 mtk_hsdma_reset_chan(hsdma, chan);
600
601 /* enable rx intr */
602 mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, HSDMA_INT_RX_Q0);
603
604 /* enable dma */
605 mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, HSDMA_GLO_DEFAULT);
606
607 /* hardware info */
608 reg = mtk_hsdma_read(hsdma, HSDMA_REG_INFO);
609 dev_info(hsdma->ddev.dev, "rx: %d, tx: %d\n",
610 (reg >> HSDMA_INFO_RX_SHIFT) & HSDMA_INFO_RX_MASK,
611 (reg >> HSDMA_INFO_TX_SHIFT) & HSDMA_INFO_TX_MASK);
612
613 hsdma_dump_reg(hsdma);
614
615 return ret;
616 }
617
mtk_hsdma_uninit(struct mtk_hsdam_engine * hsdma)618 static void mtk_hsdma_uninit(struct mtk_hsdam_engine *hsdma)
619 {
620 struct mtk_hsdma_chan *chan;
621
622 /* disable dma */
623 mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, 0);
624
625 /* disable intr */
626 mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, 0);
627
628 /* free desc */
629 chan = &hsdma->chan[0];
630 mtk_hsdam_free_desc(hsdma, chan);
631
632 /* tx */
633 mtk_hsdma_write(hsdma, HSDMA_REG_TX_BASE, 0);
634 mtk_hsdma_write(hsdma, HSDMA_REG_TX_CNT, 0);
635 /* rx */
636 mtk_hsdma_write(hsdma, HSDMA_REG_RX_BASE, 0);
637 mtk_hsdma_write(hsdma, HSDMA_REG_RX_CNT, 0);
638 /* reset */
639 mtk_hsdma_reset_chan(hsdma, chan);
640 }
641
642 static const struct of_device_id mtk_hsdma_of_match[] = {
643 { .compatible = "mediatek,mt7621-hsdma" },
644 { },
645 };
646
mtk_hsdma_probe(struct platform_device * pdev)647 static int mtk_hsdma_probe(struct platform_device *pdev)
648 {
649 const struct of_device_id *match;
650 struct mtk_hsdma_chan *chan;
651 struct mtk_hsdam_engine *hsdma;
652 struct dma_device *dd;
653 int ret;
654 int irq;
655 void __iomem *base;
656
657 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
658 if (ret)
659 return ret;
660
661 match = of_match_device(mtk_hsdma_of_match, &pdev->dev);
662 if (!match)
663 return -EINVAL;
664
665 hsdma = devm_kzalloc(&pdev->dev, sizeof(*hsdma), GFP_KERNEL);
666 if (!hsdma)
667 return -EINVAL;
668
669 base = devm_platform_ioremap_resource(pdev, 0);
670 if (IS_ERR(base))
671 return PTR_ERR(base);
672 hsdma->base = base + HSDMA_BASE_OFFSET;
673 tasklet_setup(&hsdma->task, mtk_hsdma_tasklet);
674
675 irq = platform_get_irq(pdev, 0);
676 if (irq < 0)
677 return -EINVAL;
678 ret = devm_request_irq(&pdev->dev, irq, mtk_hsdma_irq,
679 0, dev_name(&pdev->dev), hsdma);
680 if (ret) {
681 dev_err(&pdev->dev, "failed to request irq\n");
682 return ret;
683 }
684
685 device_reset(&pdev->dev);
686
687 dd = &hsdma->ddev;
688 dma_cap_set(DMA_MEMCPY, dd->cap_mask);
689 dd->copy_align = HSDMA_ALIGN_SIZE;
690 dd->device_free_chan_resources = mtk_hsdma_free_chan_resources;
691 dd->device_prep_dma_memcpy = mtk_hsdma_prep_dma_memcpy;
692 dd->device_terminate_all = mtk_hsdma_terminate_all;
693 dd->device_tx_status = mtk_hsdma_tx_status;
694 dd->device_issue_pending = mtk_hsdma_issue_pending;
695 dd->dev = &pdev->dev;
696 dd->dev->dma_parms = &hsdma->dma_parms;
697 dma_set_max_seg_size(dd->dev, HSDMA_MAX_PLEN);
698 INIT_LIST_HEAD(&dd->channels);
699
700 chan = &hsdma->chan[0];
701 chan->id = 0;
702 chan->vchan.desc_free = mtk_hsdma_desc_free;
703 vchan_init(&chan->vchan, dd);
704
705 /* init hardware */
706 ret = mtk_hsdma_init(hsdma);
707 if (ret) {
708 dev_err(&pdev->dev, "failed to alloc ring descs\n");
709 return ret;
710 }
711
712 ret = dma_async_device_register(dd);
713 if (ret) {
714 dev_err(&pdev->dev, "failed to register dma device\n");
715 goto err_uninit_hsdma;
716 }
717
718 ret = of_dma_controller_register(pdev->dev.of_node,
719 of_dma_xlate_by_chan_id, hsdma);
720 if (ret) {
721 dev_err(&pdev->dev, "failed to register of dma controller\n");
722 goto err_unregister;
723 }
724
725 platform_set_drvdata(pdev, hsdma);
726
727 return 0;
728
729 err_unregister:
730 dma_async_device_unregister(dd);
731 err_uninit_hsdma:
732 mtk_hsdma_uninit(hsdma);
733 return ret;
734 }
735
mtk_hsdma_remove(struct platform_device * pdev)736 static int mtk_hsdma_remove(struct platform_device *pdev)
737 {
738 struct mtk_hsdam_engine *hsdma = platform_get_drvdata(pdev);
739
740 mtk_hsdma_uninit(hsdma);
741
742 of_dma_controller_free(pdev->dev.of_node);
743 dma_async_device_unregister(&hsdma->ddev);
744
745 return 0;
746 }
747
748 static struct platform_driver mtk_hsdma_driver = {
749 .probe = mtk_hsdma_probe,
750 .remove = mtk_hsdma_remove,
751 .driver = {
752 .name = KBUILD_MODNAME,
753 .of_match_table = mtk_hsdma_of_match,
754 },
755 };
756 module_platform_driver(mtk_hsdma_driver);
757
758 MODULE_AUTHOR("Michael Lee <igvtee@gmail.com>");
759 MODULE_DESCRIPTION("MTK HSDMA driver");
760 MODULE_LICENSE("GPL v2");
761