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1/*
2 * drivers/dma/fsl-edma.c
3 *
4 * Copyright 2013-2014 Freescale Semiconductor, Inc.
5 *
6 * Driver for the Freescale eDMA engine with flexible channel multiplexing
7 * capability for DMA request sources. The eDMA block can be found on some
8 * Vybrid and Layerscape SoCs.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 */
15
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/interrupt.h>
19#include <linux/clk.h>
20#include <linux/dma-mapping.h>
21#include <linux/dmapool.h>
22#include <linux/slab.h>
23#include <linux/spinlock.h>
24#include <linux/of.h>
25#include <linux/of_device.h>
26#include <linux/of_address.h>
27#include <linux/of_irq.h>
28#include <linux/of_dma.h>
29
30#include "virt-dma.h"
31
32#define EDMA_CR 0x00
33#define EDMA_ES 0x04
34#define EDMA_ERQ 0x0C
35#define EDMA_EEI 0x14
36#define EDMA_SERQ 0x1B
37#define EDMA_CERQ 0x1A
38#define EDMA_SEEI 0x19
39#define EDMA_CEEI 0x18
40#define EDMA_CINT 0x1F
41#define EDMA_CERR 0x1E
42#define EDMA_SSRT 0x1D
43#define EDMA_CDNE 0x1C
44#define EDMA_INTR 0x24
45#define EDMA_ERR 0x2C
46
47#define EDMA_TCD_SADDR(x) (0x1000 + 32 * (x))
48#define EDMA_TCD_SOFF(x) (0x1004 + 32 * (x))
49#define EDMA_TCD_ATTR(x) (0x1006 + 32 * (x))
50#define EDMA_TCD_NBYTES(x) (0x1008 + 32 * (x))
51#define EDMA_TCD_SLAST(x) (0x100C + 32 * (x))
52#define EDMA_TCD_DADDR(x) (0x1010 + 32 * (x))
53#define EDMA_TCD_DOFF(x) (0x1014 + 32 * (x))
54#define EDMA_TCD_CITER_ELINK(x) (0x1016 + 32 * (x))
55#define EDMA_TCD_CITER(x) (0x1016 + 32 * (x))
56#define EDMA_TCD_DLAST_SGA(x) (0x1018 + 32 * (x))
57#define EDMA_TCD_CSR(x) (0x101C + 32 * (x))
58#define EDMA_TCD_BITER_ELINK(x) (0x101E + 32 * (x))
59#define EDMA_TCD_BITER(x) (0x101E + 32 * (x))
60
61#define EDMA_CR_EDBG BIT(1)
62#define EDMA_CR_ERCA BIT(2)
63#define EDMA_CR_ERGA BIT(3)
64#define EDMA_CR_HOE BIT(4)
65#define EDMA_CR_HALT BIT(5)
66#define EDMA_CR_CLM BIT(6)
67#define EDMA_CR_EMLM BIT(7)
68#define EDMA_CR_ECX BIT(16)
69#define EDMA_CR_CX BIT(17)
70
71#define EDMA_SEEI_SEEI(x) ((x) & 0x1F)
72#define EDMA_CEEI_CEEI(x) ((x) & 0x1F)
73#define EDMA_CINT_CINT(x) ((x) & 0x1F)
74#define EDMA_CERR_CERR(x) ((x) & 0x1F)
75
76#define EDMA_TCD_ATTR_DSIZE(x) (((x) & 0x0007))
77#define EDMA_TCD_ATTR_DMOD(x) (((x) & 0x001F) << 3)
78#define EDMA_TCD_ATTR_SSIZE(x) (((x) & 0x0007) << 8)
79#define EDMA_TCD_ATTR_SMOD(x) (((x) & 0x001F) << 11)
80#define EDMA_TCD_ATTR_SSIZE_8BIT (0x0000)
81#define EDMA_TCD_ATTR_SSIZE_16BIT (0x0100)
82#define EDMA_TCD_ATTR_SSIZE_32BIT (0x0200)
83#define EDMA_TCD_ATTR_SSIZE_64BIT (0x0300)
84#define EDMA_TCD_ATTR_SSIZE_32BYTE (0x0500)
85#define EDMA_TCD_ATTR_DSIZE_8BIT (0x0000)
86#define EDMA_TCD_ATTR_DSIZE_16BIT (0x0001)
87#define EDMA_TCD_ATTR_DSIZE_32BIT (0x0002)
88#define EDMA_TCD_ATTR_DSIZE_64BIT (0x0003)
89#define EDMA_TCD_ATTR_DSIZE_32BYTE (0x0005)
90
91#define EDMA_TCD_SOFF_SOFF(x) (x)
92#define EDMA_TCD_NBYTES_NBYTES(x) (x)
93#define EDMA_TCD_SLAST_SLAST(x) (x)
94#define EDMA_TCD_DADDR_DADDR(x) (x)
95#define EDMA_TCD_CITER_CITER(x) ((x) & 0x7FFF)
96#define EDMA_TCD_DOFF_DOFF(x) (x)
97#define EDMA_TCD_DLAST_SGA_DLAST_SGA(x) (x)
98#define EDMA_TCD_BITER_BITER(x) ((x) & 0x7FFF)
99
100#define EDMA_TCD_CSR_START BIT(0)
101#define EDMA_TCD_CSR_INT_MAJOR BIT(1)
102#define EDMA_TCD_CSR_INT_HALF BIT(2)
103#define EDMA_TCD_CSR_D_REQ BIT(3)
104#define EDMA_TCD_CSR_E_SG BIT(4)
105#define EDMA_TCD_CSR_E_LINK BIT(5)
106#define EDMA_TCD_CSR_ACTIVE BIT(6)
107#define EDMA_TCD_CSR_DONE BIT(7)
108
109#define EDMAMUX_CHCFG_DIS 0x0
110#define EDMAMUX_CHCFG_ENBL 0x80
111#define EDMAMUX_CHCFG_SOURCE(n) ((n) & 0x3F)
112
113#define DMAMUX_NR 2
114
115#define FSL_EDMA_BUSWIDTHS BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
116 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
117 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
118 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)
119
120struct fsl_edma_hw_tcd {
121 u32 saddr;
122 u16 soff;
123 u16 attr;
124 u32 nbytes;
125 u32 slast;
126 u32 daddr;
127 u16 doff;
128 u16 citer;
129 u32 dlast_sga;
130 u16 csr;
131 u16 biter;
132};
133
134struct fsl_edma_sw_tcd {
135 dma_addr_t ptcd;
136 struct fsl_edma_hw_tcd *vtcd;
137};
138
139struct fsl_edma_slave_config {
140 enum dma_transfer_direction dir;
141 enum dma_slave_buswidth addr_width;
142 u32 dev_addr;
143 u32 burst;
144 u32 attr;
145};
146
147struct fsl_edma_chan {
148 struct virt_dma_chan vchan;
149 enum dma_status status;
150 struct fsl_edma_engine *edma;
151 struct fsl_edma_desc *edesc;
152 struct fsl_edma_slave_config fsc;
153 struct dma_pool *tcd_pool;
154};
155
156struct fsl_edma_desc {
157 struct virt_dma_desc vdesc;
158 struct fsl_edma_chan *echan;
159 bool iscyclic;
160 unsigned int n_tcds;
161 struct fsl_edma_sw_tcd tcd[];
162};
163
164struct fsl_edma_engine {
165 struct dma_device dma_dev;
166 void __iomem *membase;
167 void __iomem *muxbase[DMAMUX_NR];
168 struct clk *muxclk[DMAMUX_NR];
169 struct mutex fsl_edma_mutex;
170 u32 n_chans;
171 int txirq;
172 int errirq;
173 bool big_endian;
174 struct fsl_edma_chan chans[];
175};
176
177/*
178 * R/W functions for big- or little-endian registers
179 * the eDMA controller's endian is independent of the CPU core's endian.
180 */
181
182static u16 edma_readw(struct fsl_edma_engine *edma, void __iomem *addr)
183{
184 if (edma->big_endian)
185 return ioread16be(addr);
186 else
187 return ioread16(addr);
188}
189
190static u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
191{
192 if (edma->big_endian)
193 return ioread32be(addr);
194 else
195 return ioread32(addr);
196}
197
198static void edma_writeb(struct fsl_edma_engine *edma, u8 val, void __iomem *addr)
199{
200 iowrite8(val, addr);
201}
202
203static void edma_writew(struct fsl_edma_engine *edma, u16 val, void __iomem *addr)
204{
205 if (edma->big_endian)
206 iowrite16be(val, addr);
207 else
208 iowrite16(val, addr);
209}
210
211static void edma_writel(struct fsl_edma_engine *edma, u32 val, void __iomem *addr)
212{
213 if (edma->big_endian)
214 iowrite32be(val, addr);
215 else
216 iowrite32(val, addr);
217}
218
219static struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
220{
221 return container_of(chan, struct fsl_edma_chan, vchan.chan);
222}
223
224static struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
225{
226 return container_of(vd, struct fsl_edma_desc, vdesc);
227}
228
229static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)
230{
231 void __iomem *addr = fsl_chan->edma->membase;
232 u32 ch = fsl_chan->vchan.chan.chan_id;
233
234 edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI);
235 edma_writeb(fsl_chan->edma, ch, addr + EDMA_SERQ);
236}
237
238static void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)
239{
240 void __iomem *addr = fsl_chan->edma->membase;
241 u32 ch = fsl_chan->vchan.chan.chan_id;
242
243 edma_writeb(fsl_chan->edma, ch, addr + EDMA_CERQ);
244 edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI);
245}
246
247static void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
248 unsigned int slot, bool enable)
249{
250 u32 ch = fsl_chan->vchan.chan.chan_id;
251 void __iomem *muxaddr = fsl_chan->edma->muxbase[ch / DMAMUX_NR];
252 unsigned chans_per_mux, ch_off;
253
254 chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR;
255 ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
256
257 if (enable)
258 edma_writeb(fsl_chan->edma,
259 EDMAMUX_CHCFG_ENBL | EDMAMUX_CHCFG_SOURCE(slot),
260 muxaddr + ch_off);
261 else
262 edma_writeb(fsl_chan->edma, EDMAMUX_CHCFG_DIS, muxaddr + ch_off);
263}
264
265static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
266{
267 switch (addr_width) {
268 case 1:
269 return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT;
270 case 2:
271 return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT;
272 case 4:
273 return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
274 case 8:
275 return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT;
276 default:
277 return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
278 }
279}
280
281static void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
282{
283 struct fsl_edma_desc *fsl_desc;
284 int i;
285
286 fsl_desc = to_fsl_edma_desc(vdesc);
287 for (i = 0; i < fsl_desc->n_tcds; i++)
288 dma_pool_free(fsl_desc->echan->tcd_pool,
289 fsl_desc->tcd[i].vtcd,
290 fsl_desc->tcd[i].ptcd);
291 kfree(fsl_desc);
292}
293
294static int fsl_edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
295 unsigned long arg)
296{
297 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
298 struct dma_slave_config *cfg = (void *)arg;
299 unsigned long flags;
300 LIST_HEAD(head);
301
302 switch (cmd) {
303 case DMA_TERMINATE_ALL:
304 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
305 fsl_edma_disable_request(fsl_chan);
306 fsl_chan->edesc = NULL;
307 vchan_get_all_descriptors(&fsl_chan->vchan, &head);
308 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
309 vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
310 return 0;
311
312 case DMA_SLAVE_CONFIG:
313 fsl_chan->fsc.dir = cfg->direction;
314 if (cfg->direction == DMA_DEV_TO_MEM) {
315 fsl_chan->fsc.dev_addr = cfg->src_addr;
316 fsl_chan->fsc.addr_width = cfg->src_addr_width;
317 fsl_chan->fsc.burst = cfg->src_maxburst;
318 fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->src_addr_width);
319 } else if (cfg->direction == DMA_MEM_TO_DEV) {
320 fsl_chan->fsc.dev_addr = cfg->dst_addr;
321 fsl_chan->fsc.addr_width = cfg->dst_addr_width;
322 fsl_chan->fsc.burst = cfg->dst_maxburst;
323 fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->dst_addr_width);
324 } else {
325 return -EINVAL;
326 }
327 return 0;
328
329 case DMA_PAUSE:
330 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
331 if (fsl_chan->edesc) {
332 fsl_edma_disable_request(fsl_chan);
333 fsl_chan->status = DMA_PAUSED;
334 }
335 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
336 return 0;
337
338 case DMA_RESUME:
339 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
340 if (fsl_chan->edesc) {
341 fsl_edma_enable_request(fsl_chan);
342 fsl_chan->status = DMA_IN_PROGRESS;
343 }
344 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
345 return 0;
346
347 default:
348 return -ENXIO;
349 }
350}
351
352static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
353 struct virt_dma_desc *vdesc, bool in_progress)
354{
355 struct fsl_edma_desc *edesc = fsl_chan->edesc;
356 void __iomem *addr = fsl_chan->edma->membase;
357 u32 ch = fsl_chan->vchan.chan.chan_id;
358 enum dma_transfer_direction dir = fsl_chan->fsc.dir;
359 dma_addr_t cur_addr, dma_addr;
360 size_t len, size;
361 int i;
362
363 /* calculate the total size in this desc */
364 for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++)
365 len += edma_readl(fsl_chan->edma, &(edesc->tcd[i].vtcd->nbytes))
366 * edma_readw(fsl_chan->edma, &(edesc->tcd[i].vtcd->biter));
367
368 if (!in_progress)
369 return len;
370
371 if (dir == DMA_MEM_TO_DEV)
372 cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_SADDR(ch));
373 else
374 cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_DADDR(ch));
375
376 /* figure out the finished and calculate the residue */
377 for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
378 size = edma_readl(fsl_chan->edma, &(edesc->tcd[i].vtcd->nbytes))
379 * edma_readw(fsl_chan->edma, &(edesc->tcd[i].vtcd->biter));
380 if (dir == DMA_MEM_TO_DEV)
381 dma_addr = edma_readl(fsl_chan->edma,
382 &(edesc->tcd[i].vtcd->saddr));
383 else
384 dma_addr = edma_readl(fsl_chan->edma,
385 &(edesc->tcd[i].vtcd->daddr));
386
387 len -= size;
388 if (cur_addr > dma_addr && cur_addr < dma_addr + size) {
389 len += dma_addr + size - cur_addr;
390 break;
391 }
392 }
393
394 return len;
395}
396
397static enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
398 dma_cookie_t cookie, struct dma_tx_state *txstate)
399{
400 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
401 struct virt_dma_desc *vdesc;
402 enum dma_status status;
403 unsigned long flags;
404
405 status = dma_cookie_status(chan, cookie, txstate);
406 if (status == DMA_COMPLETE)
407 return status;
408
409 if (!txstate)
410 return fsl_chan->status;
411
412 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
413 vdesc = vchan_find_desc(&fsl_chan->vchan, cookie);
414 if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie)
415 txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, true);
416 else if (vdesc)
417 txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, false);
418 else
419 txstate->residue = 0;
420
421 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
422
423 return fsl_chan->status;
424}
425
426static void fsl_edma_set_tcd_params(struct fsl_edma_chan *fsl_chan,
427 u32 src, u32 dst, u16 attr, u16 soff, u32 nbytes,
428 u32 slast, u16 citer, u16 biter, u32 doff, u32 dlast_sga,
429 u16 csr)
430{
431 void __iomem *addr = fsl_chan->edma->membase;
432 u32 ch = fsl_chan->vchan.chan.chan_id;
433
434 /*
435 * TCD parameters have been swapped in fill_tcd_params(),
436 * so just write them to registers in the cpu endian here
437 */
438 writew(0, addr + EDMA_TCD_CSR(ch));
439 writel(src, addr + EDMA_TCD_SADDR(ch));
440 writel(dst, addr + EDMA_TCD_DADDR(ch));
441 writew(attr, addr + EDMA_TCD_ATTR(ch));
442 writew(soff, addr + EDMA_TCD_SOFF(ch));
443 writel(nbytes, addr + EDMA_TCD_NBYTES(ch));
444 writel(slast, addr + EDMA_TCD_SLAST(ch));
445 writew(citer, addr + EDMA_TCD_CITER(ch));
446 writew(biter, addr + EDMA_TCD_BITER(ch));
447 writew(doff, addr + EDMA_TCD_DOFF(ch));
448 writel(dlast_sga, addr + EDMA_TCD_DLAST_SGA(ch));
449 writew(csr, addr + EDMA_TCD_CSR(ch));
450}
451
452static void fill_tcd_params(struct fsl_edma_engine *edma,
453 struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,
454 u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer,
455 u16 biter, u16 doff, u32 dlast_sga, bool major_int,
456 bool disable_req, bool enable_sg)
457{
458 u16 csr = 0;
459
460 /*
461 * eDMA hardware SGs require the TCD parameters stored in memory
462 * the same endian as the eDMA module so that they can be loaded
463 * automatically by the engine
464 */
465 edma_writel(edma, src, &(tcd->saddr));
466 edma_writel(edma, dst, &(tcd->daddr));
467 edma_writew(edma, attr, &(tcd->attr));
468 edma_writew(edma, EDMA_TCD_SOFF_SOFF(soff), &(tcd->soff));
469 edma_writel(edma, EDMA_TCD_NBYTES_NBYTES(nbytes), &(tcd->nbytes));
470 edma_writel(edma, EDMA_TCD_SLAST_SLAST(slast), &(tcd->slast));
471 edma_writew(edma, EDMA_TCD_CITER_CITER(citer), &(tcd->citer));
472 edma_writew(edma, EDMA_TCD_DOFF_DOFF(doff), &(tcd->doff));
473 edma_writel(edma, EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga), &(tcd->dlast_sga));
474 edma_writew(edma, EDMA_TCD_BITER_BITER(biter), &(tcd->biter));
475 if (major_int)
476 csr |= EDMA_TCD_CSR_INT_MAJOR;
477
478 if (disable_req)
479 csr |= EDMA_TCD_CSR_D_REQ;
480
481 if (enable_sg)
482 csr |= EDMA_TCD_CSR_E_SG;
483
484 edma_writew(edma, csr, &(tcd->csr));
485}
486
487static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan,
488 int sg_len)
489{
490 struct fsl_edma_desc *fsl_desc;
491 int i;
492
493 fsl_desc = kzalloc(sizeof(*fsl_desc) + sizeof(struct fsl_edma_sw_tcd) * sg_len,
494 GFP_NOWAIT);
495 if (!fsl_desc)
496 return NULL;
497
498 fsl_desc->echan = fsl_chan;
499 fsl_desc->n_tcds = sg_len;
500 for (i = 0; i < sg_len; i++) {
501 fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool,
502 GFP_NOWAIT, &fsl_desc->tcd[i].ptcd);
503 if (!fsl_desc->tcd[i].vtcd)
504 goto err;
505 }
506 return fsl_desc;
507
508err:
509 while (--i >= 0)
510 dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd,
511 fsl_desc->tcd[i].ptcd);
512 kfree(fsl_desc);
513 return NULL;
514}
515
516static struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
517 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
518 size_t period_len, enum dma_transfer_direction direction,
519 unsigned long flags, void *context)
520{
521 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
522 struct fsl_edma_desc *fsl_desc;
523 dma_addr_t dma_buf_next;
524 int sg_len, i;
525 u32 src_addr, dst_addr, last_sg, nbytes;
526 u16 soff, doff, iter;
527
528 if (!is_slave_direction(fsl_chan->fsc.dir))
529 return NULL;
530
531 sg_len = buf_len / period_len;
532 fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
533 if (!fsl_desc)
534 return NULL;
535 fsl_desc->iscyclic = true;
536
537 dma_buf_next = dma_addr;
538 nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
539 iter = period_len / nbytes;
540
541 for (i = 0; i < sg_len; i++) {
542 if (dma_buf_next >= dma_addr + buf_len)
543 dma_buf_next = dma_addr;
544
545 /* get next sg's physical address */
546 last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
547
548 if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
549 src_addr = dma_buf_next;
550 dst_addr = fsl_chan->fsc.dev_addr;
551 soff = fsl_chan->fsc.addr_width;
552 doff = 0;
553 } else {
554 src_addr = fsl_chan->fsc.dev_addr;
555 dst_addr = dma_buf_next;
556 soff = 0;
557 doff = fsl_chan->fsc.addr_width;
558 }
559
560 fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd, src_addr,
561 dst_addr, fsl_chan->fsc.attr, soff, nbytes, 0,
562 iter, iter, doff, last_sg, true, false, true);
563 dma_buf_next += period_len;
564 }
565
566 return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
567}
568
569static struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
570 struct dma_chan *chan, struct scatterlist *sgl,
571 unsigned int sg_len, enum dma_transfer_direction direction,
572 unsigned long flags, void *context)
573{
574 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
575 struct fsl_edma_desc *fsl_desc;
576 struct scatterlist *sg;
577 u32 src_addr, dst_addr, last_sg, nbytes;
578 u16 soff, doff, iter;
579 int i;
580
581 if (!is_slave_direction(fsl_chan->fsc.dir))
582 return NULL;
583
584 fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
585 if (!fsl_desc)
586 return NULL;
587 fsl_desc->iscyclic = false;
588
589 nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;
590 for_each_sg(sgl, sg, sg_len, i) {
591 /* get next sg's physical address */
592 last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
593
594 if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {
595 src_addr = sg_dma_address(sg);
596 dst_addr = fsl_chan->fsc.dev_addr;
597 soff = fsl_chan->fsc.addr_width;
598 doff = 0;
599 } else {
600 src_addr = fsl_chan->fsc.dev_addr;
601 dst_addr = sg_dma_address(sg);
602 soff = 0;
603 doff = fsl_chan->fsc.addr_width;
604 }
605
606 iter = sg_dma_len(sg) / nbytes;
607 if (i < sg_len - 1) {
608 last_sg = fsl_desc->tcd[(i + 1)].ptcd;
609 fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd,
610 src_addr, dst_addr, fsl_chan->fsc.attr,
611 soff, nbytes, 0, iter, iter, doff, last_sg,
612 false, false, true);
613 } else {
614 last_sg = 0;
615 fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd,
616 src_addr, dst_addr, fsl_chan->fsc.attr,
617 soff, nbytes, 0, iter, iter, doff, last_sg,
618 true, true, false);
619 }
620 }
621
622 return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
623}
624
625static void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
626{
627 struct fsl_edma_hw_tcd *tcd;
628 struct virt_dma_desc *vdesc;
629
630 vdesc = vchan_next_desc(&fsl_chan->vchan);
631 if (!vdesc)
632 return;
633 fsl_chan->edesc = to_fsl_edma_desc(vdesc);
634 tcd = fsl_chan->edesc->tcd[0].vtcd;
635 fsl_edma_set_tcd_params(fsl_chan, tcd->saddr, tcd->daddr, tcd->attr,
636 tcd->soff, tcd->nbytes, tcd->slast, tcd->citer,
637 tcd->biter, tcd->doff, tcd->dlast_sga, tcd->csr);
638 fsl_edma_enable_request(fsl_chan);
639 fsl_chan->status = DMA_IN_PROGRESS;
640}
641
642static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
643{
644 struct fsl_edma_engine *fsl_edma = dev_id;
645 unsigned int intr, ch;
646 void __iomem *base_addr;
647 struct fsl_edma_chan *fsl_chan;
648
649 base_addr = fsl_edma->membase;
650
651 intr = edma_readl(fsl_edma, base_addr + EDMA_INTR);
652 if (!intr)
653 return IRQ_NONE;
654
655 for (ch = 0; ch < fsl_edma->n_chans; ch++) {
656 if (intr & (0x1 << ch)) {
657 edma_writeb(fsl_edma, EDMA_CINT_CINT(ch),
658 base_addr + EDMA_CINT);
659
660 fsl_chan = &fsl_edma->chans[ch];
661
662 spin_lock(&fsl_chan->vchan.lock);
663 if (!fsl_chan->edesc->iscyclic) {
664 list_del(&fsl_chan->edesc->vdesc.node);
665 vchan_cookie_complete(&fsl_chan->edesc->vdesc);
666 fsl_chan->edesc = NULL;
667 fsl_chan->status = DMA_COMPLETE;
668 } else {
669 vchan_cyclic_callback(&fsl_chan->edesc->vdesc);
670 }
671
672 if (!fsl_chan->edesc)
673 fsl_edma_xfer_desc(fsl_chan);
674
675 spin_unlock(&fsl_chan->vchan.lock);
676 }
677 }
678 return IRQ_HANDLED;
679}
680
681static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id)
682{
683 struct fsl_edma_engine *fsl_edma = dev_id;
684 unsigned int err, ch;
685
686 err = edma_readl(fsl_edma, fsl_edma->membase + EDMA_ERR);
687 if (!err)
688 return IRQ_NONE;
689
690 for (ch = 0; ch < fsl_edma->n_chans; ch++) {
691 if (err & (0x1 << ch)) {
692 fsl_edma_disable_request(&fsl_edma->chans[ch]);
693 edma_writeb(fsl_edma, EDMA_CERR_CERR(ch),
694 fsl_edma->membase + EDMA_CERR);
695 fsl_edma->chans[ch].status = DMA_ERROR;
696 }
697 }
698 return IRQ_HANDLED;
699}
700
701static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
702{
703 if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED)
704 return IRQ_HANDLED;
705
706 return fsl_edma_err_handler(irq, dev_id);
707}
708
709static void fsl_edma_issue_pending(struct dma_chan *chan)
710{
711 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
712 unsigned long flags;
713
714 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
715
716 if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)
717 fsl_edma_xfer_desc(fsl_chan);
718
719 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
720}
721
722static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
723 struct of_dma *ofdma)
724{
725 struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
726 struct dma_chan *chan, *_chan;
727
728 if (dma_spec->args_count != 2)
729 return NULL;
730
731 mutex_lock(&fsl_edma->fsl_edma_mutex);
732 list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
733 if (chan->client_count)
734 continue;
735 if ((chan->chan_id / DMAMUX_NR) == dma_spec->args[0]) {
736 chan = dma_get_slave_channel(chan);
737 if (chan) {
738 chan->device->privatecnt++;
739 fsl_edma_chan_mux(to_fsl_edma_chan(chan),
740 dma_spec->args[1], true);
741 mutex_unlock(&fsl_edma->fsl_edma_mutex);
742 return chan;
743 }
744 }
745 }
746 mutex_unlock(&fsl_edma->fsl_edma_mutex);
747 return NULL;
748}
749
750static int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
751{
752 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
753
754 fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,
755 sizeof(struct fsl_edma_hw_tcd),
756 32, 0);
757 return 0;
758}
759
760static void fsl_edma_free_chan_resources(struct dma_chan *chan)
761{
762 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
763 unsigned long flags;
764 LIST_HEAD(head);
765
766 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
767 fsl_edma_disable_request(fsl_chan);
768 fsl_edma_chan_mux(fsl_chan, 0, false);
769 fsl_chan->edesc = NULL;
770 vchan_get_all_descriptors(&fsl_chan->vchan, &head);
771 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
772
773 vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
774 dma_pool_destroy(fsl_chan->tcd_pool);
775 fsl_chan->tcd_pool = NULL;
776}
777
778static int fsl_dma_device_slave_caps(struct dma_chan *dchan,
779 struct dma_slave_caps *caps)
780{
781 caps->src_addr_widths = FSL_EDMA_BUSWIDTHS;
782 caps->dstn_addr_widths = FSL_EDMA_BUSWIDTHS;
783 caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
784 caps->cmd_pause = true;
785 caps->cmd_terminate = true;
786
787 return 0;
788}
789
790static int
791fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
792{
793 int ret;
794
795 fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx");
796 if (fsl_edma->txirq < 0) {
797 dev_err(&pdev->dev, "Can't get edma-tx irq.\n");
798 return fsl_edma->txirq;
799 }
800
801 fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err");
802 if (fsl_edma->errirq < 0) {
803 dev_err(&pdev->dev, "Can't get edma-err irq.\n");
804 return fsl_edma->errirq;
805 }
806
807 if (fsl_edma->txirq == fsl_edma->errirq) {
808 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
809 fsl_edma_irq_handler, 0, "eDMA", fsl_edma);
810 if (ret) {
811 dev_err(&pdev->dev, "Can't register eDMA IRQ.\n");
812 return ret;
813 }
814 } else {
815 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
816 fsl_edma_tx_handler, 0, "eDMA tx", fsl_edma);
817 if (ret) {
818 dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n");
819 return ret;
820 }
821
822 ret = devm_request_irq(&pdev->dev, fsl_edma->errirq,
823 fsl_edma_err_handler, 0, "eDMA err", fsl_edma);
824 if (ret) {
825 dev_err(&pdev->dev, "Can't register eDMA err IRQ.\n");
826 return ret;
827 }
828 }
829
830 return 0;
831}
832
833static int fsl_edma_probe(struct platform_device *pdev)
834{
835 struct device_node *np = pdev->dev.of_node;
836 struct fsl_edma_engine *fsl_edma;
837 struct fsl_edma_chan *fsl_chan;
838 struct resource *res;
839 int len, chans;
840 int ret, i;
841
842 ret = of_property_read_u32(np, "dma-channels", &chans);
843 if (ret) {
844 dev_err(&pdev->dev, "Can't get dma-channels.\n");
845 return ret;
846 }
847
848 len = sizeof(*fsl_edma) + sizeof(*fsl_chan) * chans;
849 fsl_edma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
850 if (!fsl_edma)
851 return -ENOMEM;
852
853 fsl_edma->n_chans = chans;
854 mutex_init(&fsl_edma->fsl_edma_mutex);
855
856 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
857 fsl_edma->membase = devm_ioremap_resource(&pdev->dev, res);
858 if (IS_ERR(fsl_edma->membase))
859 return PTR_ERR(fsl_edma->membase);
860
861 for (i = 0; i < DMAMUX_NR; i++) {
862 char clkname[32];
863
864 res = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i);
865 fsl_edma->muxbase[i] = devm_ioremap_resource(&pdev->dev, res);
866 if (IS_ERR(fsl_edma->muxbase[i]))
867 return PTR_ERR(fsl_edma->muxbase[i]);
868
869 sprintf(clkname, "dmamux%d", i);
870 fsl_edma->muxclk[i] = devm_clk_get(&pdev->dev, clkname);
871 if (IS_ERR(fsl_edma->muxclk[i])) {
872 dev_err(&pdev->dev, "Missing DMAMUX block clock.\n");
873 return PTR_ERR(fsl_edma->muxclk[i]);
874 }
875
876 ret = clk_prepare_enable(fsl_edma->muxclk[i]);
877 if (ret) {
878 dev_err(&pdev->dev, "DMAMUX clk block failed.\n");
879 return ret;
880 }
881
882 }
883
884 ret = fsl_edma_irq_init(pdev, fsl_edma);
885 if (ret)
886 return ret;
887
888 fsl_edma->big_endian = of_property_read_bool(np, "big-endian");
889
890 INIT_LIST_HEAD(&fsl_edma->dma_dev.channels);
891 for (i = 0; i < fsl_edma->n_chans; i++) {
892 struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i];
893
894 fsl_chan->edma = fsl_edma;
895
896 fsl_chan->vchan.desc_free = fsl_edma_free_desc;
897 vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);
898
899 edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i));
900 fsl_edma_chan_mux(fsl_chan, 0, false);
901 }
902
903 dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask);
904 dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask);
905 dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask);
906
907 fsl_edma->dma_dev.dev = &pdev->dev;
908 fsl_edma->dma_dev.device_alloc_chan_resources
909 = fsl_edma_alloc_chan_resources;
910 fsl_edma->dma_dev.device_free_chan_resources
911 = fsl_edma_free_chan_resources;
912 fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
913 fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
914 fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic;
915 fsl_edma->dma_dev.device_control = fsl_edma_control;
916 fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
917 fsl_edma->dma_dev.device_slave_caps = fsl_dma_device_slave_caps;
918
919 platform_set_drvdata(pdev, fsl_edma);
920
921 ret = dma_async_device_register(&fsl_edma->dma_dev);
922 if (ret) {
923 dev_err(&pdev->dev, "Can't register Freescale eDMA engine.\n");
924 return ret;
925 }
926
927 ret = of_dma_controller_register(np, fsl_edma_xlate, fsl_edma);
928 if (ret) {
929 dev_err(&pdev->dev, "Can't register Freescale eDMA of_dma.\n");
930 dma_async_device_unregister(&fsl_edma->dma_dev);
931 return ret;
932 }
933
934 /* enable round robin arbitration */
935 edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, fsl_edma->membase + EDMA_CR);
936
937 return 0;
938}
939
940static int fsl_edma_remove(struct platform_device *pdev)
941{
942 struct device_node *np = pdev->dev.of_node;
943 struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev);
944 int i;
945
946 of_dma_controller_free(np);
947 dma_async_device_unregister(&fsl_edma->dma_dev);
948
949 for (i = 0; i < DMAMUX_NR; i++)
950 clk_disable_unprepare(fsl_edma->muxclk[i]);
951
952 return 0;
953}
954
955static const struct of_device_id fsl_edma_dt_ids[] = {
956 { .compatible = "fsl,vf610-edma", },
957 { /* sentinel */ }
958};
959MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
960
961static struct platform_driver fsl_edma_driver = {
962 .driver = {
963 .name = "fsl-edma",
964 .owner = THIS_MODULE,
965 .of_match_table = fsl_edma_dt_ids,
966 },
967 .probe = fsl_edma_probe,
968 .remove = fsl_edma_remove,
969};
970
971static int __init fsl_edma_init(void)
972{
973 return platform_driver_register(&fsl_edma_driver);
974}
975subsys_initcall(fsl_edma_init);
976
977static void __exit fsl_edma_exit(void)
978{
979 platform_driver_unregister(&fsl_edma_driver);
980}
981module_exit(fsl_edma_exit);
982
983MODULE_ALIAS("platform:fsl-edma");
984MODULE_DESCRIPTION("Freescale eDMA engine driver");
985MODULE_LICENSE("GPL v2");