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d6be34fb JL |
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 | ||
120 | struct fsl_edma_hw_tcd { | |
1e2dbdef JL |
121 | __le32 saddr; |
122 | __le16 soff; | |
123 | __le16 attr; | |
124 | __le32 nbytes; | |
125 | __le32 slast; | |
126 | __le32 daddr; | |
127 | __le16 doff; | |
128 | __le16 citer; | |
129 | __le32 dlast_sga; | |
130 | __le16 csr; | |
131 | __le16 biter; | |
d6be34fb JL |
132 | }; |
133 | ||
134 | struct fsl_edma_sw_tcd { | |
135 | dma_addr_t ptcd; | |
136 | struct fsl_edma_hw_tcd *vtcd; | |
137 | }; | |
138 | ||
139 | struct 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 | ||
147 | struct 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 | ||
156 | struct 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 | ||
164 | struct 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 | /* | |
1e2dbdef JL |
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 | * For the big-endian IP module, the offset for 8-bit or 16-bit registers | |
181 | * should also be swapped opposite to that in little-endian IP. | |
d6be34fb JL |
182 | */ |
183 | ||
d6be34fb JL |
184 | static u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr) |
185 | { | |
186 | if (edma->big_endian) | |
187 | return ioread32be(addr); | |
188 | else | |
189 | return ioread32(addr); | |
190 | } | |
191 | ||
192 | static void edma_writeb(struct fsl_edma_engine *edma, u8 val, void __iomem *addr) | |
193 | { | |
1e2dbdef JL |
194 | /* swap the reg offset for these in big-endian mode */ |
195 | if (edma->big_endian) | |
196 | iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3)); | |
197 | else | |
198 | iowrite8(val, addr); | |
d6be34fb JL |
199 | } |
200 | ||
201 | static void edma_writew(struct fsl_edma_engine *edma, u16 val, void __iomem *addr) | |
202 | { | |
1e2dbdef | 203 | /* swap the reg offset for these in big-endian mode */ |
d6be34fb | 204 | if (edma->big_endian) |
1e2dbdef | 205 | iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2)); |
d6be34fb JL |
206 | else |
207 | iowrite16(val, addr); | |
208 | } | |
209 | ||
210 | static void edma_writel(struct fsl_edma_engine *edma, u32 val, void __iomem *addr) | |
211 | { | |
212 | if (edma->big_endian) | |
213 | iowrite32be(val, addr); | |
214 | else | |
215 | iowrite32(val, addr); | |
216 | } | |
217 | ||
218 | static struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan) | |
219 | { | |
220 | return container_of(chan, struct fsl_edma_chan, vchan.chan); | |
221 | } | |
222 | ||
223 | static struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd) | |
224 | { | |
225 | return container_of(vd, struct fsl_edma_desc, vdesc); | |
226 | } | |
227 | ||
228 | static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan) | |
229 | { | |
230 | void __iomem *addr = fsl_chan->edma->membase; | |
231 | u32 ch = fsl_chan->vchan.chan.chan_id; | |
232 | ||
233 | edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI); | |
234 | edma_writeb(fsl_chan->edma, ch, addr + EDMA_SERQ); | |
235 | } | |
236 | ||
237 | static void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan) | |
238 | { | |
239 | void __iomem *addr = fsl_chan->edma->membase; | |
240 | u32 ch = fsl_chan->vchan.chan.chan_id; | |
241 | ||
242 | edma_writeb(fsl_chan->edma, ch, addr + EDMA_CERQ); | |
243 | edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI); | |
244 | } | |
245 | ||
246 | static void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan, | |
247 | unsigned int slot, bool enable) | |
248 | { | |
249 | u32 ch = fsl_chan->vchan.chan.chan_id; | |
211bfef7 | 250 | void __iomem *muxaddr; |
d6be34fb JL |
251 | unsigned chans_per_mux, ch_off; |
252 | ||
253 | chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR; | |
254 | ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux; | |
211bfef7 | 255 | muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux]; |
1e2dbdef | 256 | slot = EDMAMUX_CHCFG_SOURCE(slot); |
d6be34fb JL |
257 | |
258 | if (enable) | |
1e2dbdef | 259 | iowrite8(EDMAMUX_CHCFG_ENBL | slot, muxaddr + ch_off); |
d6be34fb | 260 | else |
1e2dbdef | 261 | iowrite8(EDMAMUX_CHCFG_DIS, muxaddr + ch_off); |
d6be34fb JL |
262 | } |
263 | ||
264 | static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width) | |
265 | { | |
266 | switch (addr_width) { | |
267 | case 1: | |
268 | return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT; | |
269 | case 2: | |
270 | return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT; | |
271 | case 4: | |
272 | return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT; | |
273 | case 8: | |
274 | return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT; | |
275 | default: | |
276 | return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT; | |
277 | } | |
278 | } | |
279 | ||
280 | static void fsl_edma_free_desc(struct virt_dma_desc *vdesc) | |
281 | { | |
282 | struct fsl_edma_desc *fsl_desc; | |
283 | int i; | |
284 | ||
285 | fsl_desc = to_fsl_edma_desc(vdesc); | |
286 | for (i = 0; i < fsl_desc->n_tcds; i++) | |
1e2dbdef JL |
287 | dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd, |
288 | fsl_desc->tcd[i].ptcd); | |
d6be34fb JL |
289 | kfree(fsl_desc); |
290 | } | |
291 | ||
292 | static int fsl_edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
293 | unsigned long arg) | |
294 | { | |
295 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); | |
296 | struct dma_slave_config *cfg = (void *)arg; | |
297 | unsigned long flags; | |
298 | LIST_HEAD(head); | |
299 | ||
300 | switch (cmd) { | |
301 | case DMA_TERMINATE_ALL: | |
302 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); | |
303 | fsl_edma_disable_request(fsl_chan); | |
304 | fsl_chan->edesc = NULL; | |
305 | vchan_get_all_descriptors(&fsl_chan->vchan, &head); | |
306 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); | |
307 | vchan_dma_desc_free_list(&fsl_chan->vchan, &head); | |
308 | return 0; | |
309 | ||
310 | case DMA_SLAVE_CONFIG: | |
311 | fsl_chan->fsc.dir = cfg->direction; | |
312 | if (cfg->direction == DMA_DEV_TO_MEM) { | |
313 | fsl_chan->fsc.dev_addr = cfg->src_addr; | |
314 | fsl_chan->fsc.addr_width = cfg->src_addr_width; | |
315 | fsl_chan->fsc.burst = cfg->src_maxburst; | |
316 | fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->src_addr_width); | |
317 | } else if (cfg->direction == DMA_MEM_TO_DEV) { | |
318 | fsl_chan->fsc.dev_addr = cfg->dst_addr; | |
319 | fsl_chan->fsc.addr_width = cfg->dst_addr_width; | |
320 | fsl_chan->fsc.burst = cfg->dst_maxburst; | |
321 | fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->dst_addr_width); | |
322 | } else { | |
323 | return -EINVAL; | |
324 | } | |
325 | return 0; | |
326 | ||
327 | case DMA_PAUSE: | |
328 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); | |
329 | if (fsl_chan->edesc) { | |
330 | fsl_edma_disable_request(fsl_chan); | |
331 | fsl_chan->status = DMA_PAUSED; | |
332 | } | |
333 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); | |
334 | return 0; | |
335 | ||
336 | case DMA_RESUME: | |
337 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); | |
338 | if (fsl_chan->edesc) { | |
339 | fsl_edma_enable_request(fsl_chan); | |
340 | fsl_chan->status = DMA_IN_PROGRESS; | |
341 | } | |
342 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); | |
343 | return 0; | |
344 | ||
345 | default: | |
346 | return -ENXIO; | |
347 | } | |
348 | } | |
349 | ||
350 | static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan, | |
351 | struct virt_dma_desc *vdesc, bool in_progress) | |
352 | { | |
353 | struct fsl_edma_desc *edesc = fsl_chan->edesc; | |
354 | void __iomem *addr = fsl_chan->edma->membase; | |
355 | u32 ch = fsl_chan->vchan.chan.chan_id; | |
356 | enum dma_transfer_direction dir = fsl_chan->fsc.dir; | |
357 | dma_addr_t cur_addr, dma_addr; | |
358 | size_t len, size; | |
359 | int i; | |
360 | ||
361 | /* calculate the total size in this desc */ | |
362 | for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++) | |
1e2dbdef JL |
363 | len += le32_to_cpu(edesc->tcd[i].vtcd->nbytes) |
364 | * le16_to_cpu(edesc->tcd[i].vtcd->biter); | |
d6be34fb JL |
365 | |
366 | if (!in_progress) | |
367 | return len; | |
368 | ||
369 | if (dir == DMA_MEM_TO_DEV) | |
370 | cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_SADDR(ch)); | |
371 | else | |
372 | cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_DADDR(ch)); | |
373 | ||
374 | /* figure out the finished and calculate the residue */ | |
375 | for (i = 0; i < fsl_chan->edesc->n_tcds; i++) { | |
1e2dbdef JL |
376 | size = le32_to_cpu(edesc->tcd[i].vtcd->nbytes) |
377 | * le16_to_cpu(edesc->tcd[i].vtcd->biter); | |
d6be34fb | 378 | if (dir == DMA_MEM_TO_DEV) |
1e2dbdef | 379 | dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr); |
d6be34fb | 380 | else |
1e2dbdef | 381 | dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr); |
d6be34fb JL |
382 | |
383 | len -= size; | |
6ab55b21 | 384 | if (cur_addr >= dma_addr && cur_addr < dma_addr + size) { |
d6be34fb JL |
385 | len += dma_addr + size - cur_addr; |
386 | break; | |
387 | } | |
388 | } | |
389 | ||
390 | return len; | |
391 | } | |
392 | ||
393 | static enum dma_status fsl_edma_tx_status(struct dma_chan *chan, | |
394 | dma_cookie_t cookie, struct dma_tx_state *txstate) | |
395 | { | |
396 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); | |
397 | struct virt_dma_desc *vdesc; | |
398 | enum dma_status status; | |
399 | unsigned long flags; | |
400 | ||
401 | status = dma_cookie_status(chan, cookie, txstate); | |
402 | if (status == DMA_COMPLETE) | |
403 | return status; | |
404 | ||
405 | if (!txstate) | |
406 | return fsl_chan->status; | |
407 | ||
408 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); | |
409 | vdesc = vchan_find_desc(&fsl_chan->vchan, cookie); | |
410 | if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie) | |
411 | txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, true); | |
412 | else if (vdesc) | |
413 | txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, false); | |
414 | else | |
415 | txstate->residue = 0; | |
416 | ||
417 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); | |
418 | ||
419 | return fsl_chan->status; | |
420 | } | |
421 | ||
1e2dbdef JL |
422 | static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan, |
423 | struct fsl_edma_hw_tcd *tcd) | |
d6be34fb | 424 | { |
1e2dbdef | 425 | struct fsl_edma_engine *edma = fsl_chan->edma; |
d6be34fb JL |
426 | void __iomem *addr = fsl_chan->edma->membase; |
427 | u32 ch = fsl_chan->vchan.chan.chan_id; | |
428 | ||
429 | /* | |
1e2dbdef JL |
430 | * TCD parameters are stored in struct fsl_edma_hw_tcd in little |
431 | * endian format. However, we need to load the TCD registers in | |
432 | * big- or little-endian obeying the eDMA engine model endian. | |
d6be34fb | 433 | */ |
1e2dbdef JL |
434 | edma_writew(edma, 0, addr + EDMA_TCD_CSR(ch)); |
435 | edma_writel(edma, le32_to_cpu(tcd->saddr), addr + EDMA_TCD_SADDR(ch)); | |
436 | edma_writel(edma, le32_to_cpu(tcd->daddr), addr + EDMA_TCD_DADDR(ch)); | |
437 | ||
438 | edma_writew(edma, le16_to_cpu(tcd->attr), addr + EDMA_TCD_ATTR(ch)); | |
439 | edma_writew(edma, le16_to_cpu(tcd->soff), addr + EDMA_TCD_SOFF(ch)); | |
440 | ||
441 | edma_writel(edma, le32_to_cpu(tcd->nbytes), addr + EDMA_TCD_NBYTES(ch)); | |
442 | edma_writel(edma, le32_to_cpu(tcd->slast), addr + EDMA_TCD_SLAST(ch)); | |
443 | ||
444 | edma_writew(edma, le16_to_cpu(tcd->citer), addr + EDMA_TCD_CITER(ch)); | |
445 | edma_writew(edma, le16_to_cpu(tcd->biter), addr + EDMA_TCD_BITER(ch)); | |
446 | edma_writew(edma, le16_to_cpu(tcd->doff), addr + EDMA_TCD_DOFF(ch)); | |
447 | ||
448 | edma_writel(edma, le32_to_cpu(tcd->dlast_sga), addr + EDMA_TCD_DLAST_SGA(ch)); | |
449 | ||
450 | edma_writew(edma, le16_to_cpu(tcd->csr), addr + EDMA_TCD_CSR(ch)); | |
d6be34fb JL |
451 | } |
452 | ||
1e2dbdef JL |
453 | static inline |
454 | void fsl_edma_fill_tcd(struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst, | |
455 | u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer, | |
456 | u16 biter, u16 doff, u32 dlast_sga, bool major_int, | |
457 | bool disable_req, bool enable_sg) | |
d6be34fb JL |
458 | { |
459 | u16 csr = 0; | |
460 | ||
461 | /* | |
1e2dbdef JL |
462 | * eDMA hardware SGs require the TCDs to be stored in little |
463 | * endian format irrespective of the register endian model. | |
464 | * So we put the value in little endian in memory, waiting | |
465 | * for fsl_edma_set_tcd_regs doing the swap. | |
d6be34fb | 466 | */ |
1e2dbdef JL |
467 | tcd->saddr = cpu_to_le32(src); |
468 | tcd->daddr = cpu_to_le32(dst); | |
469 | ||
470 | tcd->attr = cpu_to_le16(attr); | |
471 | ||
472 | tcd->soff = cpu_to_le16(EDMA_TCD_SOFF_SOFF(soff)); | |
473 | ||
474 | tcd->nbytes = cpu_to_le32(EDMA_TCD_NBYTES_NBYTES(nbytes)); | |
475 | tcd->slast = cpu_to_le32(EDMA_TCD_SLAST_SLAST(slast)); | |
476 | ||
477 | tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer)); | |
478 | tcd->doff = cpu_to_le16(EDMA_TCD_DOFF_DOFF(doff)); | |
479 | ||
480 | tcd->dlast_sga = cpu_to_le32(EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga)); | |
481 | ||
482 | tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter)); | |
d6be34fb JL |
483 | if (major_int) |
484 | csr |= EDMA_TCD_CSR_INT_MAJOR; | |
485 | ||
486 | if (disable_req) | |
487 | csr |= EDMA_TCD_CSR_D_REQ; | |
488 | ||
489 | if (enable_sg) | |
490 | csr |= EDMA_TCD_CSR_E_SG; | |
491 | ||
1e2dbdef | 492 | tcd->csr = cpu_to_le16(csr); |
d6be34fb JL |
493 | } |
494 | ||
495 | static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan, | |
496 | int sg_len) | |
497 | { | |
498 | struct fsl_edma_desc *fsl_desc; | |
499 | int i; | |
500 | ||
501 | fsl_desc = kzalloc(sizeof(*fsl_desc) + sizeof(struct fsl_edma_sw_tcd) * sg_len, | |
502 | GFP_NOWAIT); | |
503 | if (!fsl_desc) | |
504 | return NULL; | |
505 | ||
506 | fsl_desc->echan = fsl_chan; | |
507 | fsl_desc->n_tcds = sg_len; | |
508 | for (i = 0; i < sg_len; i++) { | |
509 | fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool, | |
510 | GFP_NOWAIT, &fsl_desc->tcd[i].ptcd); | |
511 | if (!fsl_desc->tcd[i].vtcd) | |
512 | goto err; | |
513 | } | |
514 | return fsl_desc; | |
515 | ||
516 | err: | |
517 | while (--i >= 0) | |
518 | dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd, | |
519 | fsl_desc->tcd[i].ptcd); | |
520 | kfree(fsl_desc); | |
521 | return NULL; | |
522 | } | |
523 | ||
524 | static struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic( | |
525 | struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, | |
526 | size_t period_len, enum dma_transfer_direction direction, | |
31c1e5a1 | 527 | unsigned long flags) |
d6be34fb JL |
528 | { |
529 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); | |
530 | struct fsl_edma_desc *fsl_desc; | |
531 | dma_addr_t dma_buf_next; | |
532 | int sg_len, i; | |
533 | u32 src_addr, dst_addr, last_sg, nbytes; | |
534 | u16 soff, doff, iter; | |
535 | ||
536 | if (!is_slave_direction(fsl_chan->fsc.dir)) | |
537 | return NULL; | |
538 | ||
539 | sg_len = buf_len / period_len; | |
540 | fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len); | |
541 | if (!fsl_desc) | |
542 | return NULL; | |
543 | fsl_desc->iscyclic = true; | |
544 | ||
545 | dma_buf_next = dma_addr; | |
546 | nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst; | |
547 | iter = period_len / nbytes; | |
548 | ||
549 | for (i = 0; i < sg_len; i++) { | |
550 | if (dma_buf_next >= dma_addr + buf_len) | |
551 | dma_buf_next = dma_addr; | |
552 | ||
553 | /* get next sg's physical address */ | |
554 | last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd; | |
555 | ||
556 | if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) { | |
557 | src_addr = dma_buf_next; | |
558 | dst_addr = fsl_chan->fsc.dev_addr; | |
559 | soff = fsl_chan->fsc.addr_width; | |
560 | doff = 0; | |
561 | } else { | |
562 | src_addr = fsl_chan->fsc.dev_addr; | |
563 | dst_addr = dma_buf_next; | |
564 | soff = 0; | |
565 | doff = fsl_chan->fsc.addr_width; | |
566 | } | |
567 | ||
1e2dbdef JL |
568 | fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, dst_addr, |
569 | fsl_chan->fsc.attr, soff, nbytes, 0, iter, | |
570 | iter, doff, last_sg, true, false, true); | |
d6be34fb JL |
571 | dma_buf_next += period_len; |
572 | } | |
573 | ||
574 | return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags); | |
575 | } | |
576 | ||
577 | static struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg( | |
578 | struct dma_chan *chan, struct scatterlist *sgl, | |
579 | unsigned int sg_len, enum dma_transfer_direction direction, | |
580 | unsigned long flags, void *context) | |
581 | { | |
582 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); | |
583 | struct fsl_edma_desc *fsl_desc; | |
584 | struct scatterlist *sg; | |
585 | u32 src_addr, dst_addr, last_sg, nbytes; | |
586 | u16 soff, doff, iter; | |
587 | int i; | |
588 | ||
589 | if (!is_slave_direction(fsl_chan->fsc.dir)) | |
590 | return NULL; | |
591 | ||
592 | fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len); | |
593 | if (!fsl_desc) | |
594 | return NULL; | |
595 | fsl_desc->iscyclic = false; | |
596 | ||
597 | nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst; | |
598 | for_each_sg(sgl, sg, sg_len, i) { | |
599 | /* get next sg's physical address */ | |
600 | last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd; | |
601 | ||
602 | if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) { | |
603 | src_addr = sg_dma_address(sg); | |
604 | dst_addr = fsl_chan->fsc.dev_addr; | |
605 | soff = fsl_chan->fsc.addr_width; | |
606 | doff = 0; | |
607 | } else { | |
608 | src_addr = fsl_chan->fsc.dev_addr; | |
609 | dst_addr = sg_dma_address(sg); | |
610 | soff = 0; | |
611 | doff = fsl_chan->fsc.addr_width; | |
612 | } | |
613 | ||
614 | iter = sg_dma_len(sg) / nbytes; | |
615 | if (i < sg_len - 1) { | |
616 | last_sg = fsl_desc->tcd[(i + 1)].ptcd; | |
1e2dbdef JL |
617 | fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, |
618 | dst_addr, fsl_chan->fsc.attr, soff, | |
619 | nbytes, 0, iter, iter, doff, last_sg, | |
620 | false, false, true); | |
d6be34fb JL |
621 | } else { |
622 | last_sg = 0; | |
1e2dbdef JL |
623 | fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, |
624 | dst_addr, fsl_chan->fsc.attr, soff, | |
625 | nbytes, 0, iter, iter, doff, last_sg, | |
626 | true, true, false); | |
d6be34fb JL |
627 | } |
628 | } | |
629 | ||
630 | return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags); | |
631 | } | |
632 | ||
633 | static void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan) | |
634 | { | |
d6be34fb JL |
635 | struct virt_dma_desc *vdesc; |
636 | ||
637 | vdesc = vchan_next_desc(&fsl_chan->vchan); | |
638 | if (!vdesc) | |
639 | return; | |
640 | fsl_chan->edesc = to_fsl_edma_desc(vdesc); | |
1e2dbdef | 641 | fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd); |
d6be34fb JL |
642 | fsl_edma_enable_request(fsl_chan); |
643 | fsl_chan->status = DMA_IN_PROGRESS; | |
644 | } | |
645 | ||
646 | static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id) | |
647 | { | |
648 | struct fsl_edma_engine *fsl_edma = dev_id; | |
649 | unsigned int intr, ch; | |
650 | void __iomem *base_addr; | |
651 | struct fsl_edma_chan *fsl_chan; | |
652 | ||
653 | base_addr = fsl_edma->membase; | |
654 | ||
655 | intr = edma_readl(fsl_edma, base_addr + EDMA_INTR); | |
656 | if (!intr) | |
657 | return IRQ_NONE; | |
658 | ||
659 | for (ch = 0; ch < fsl_edma->n_chans; ch++) { | |
660 | if (intr & (0x1 << ch)) { | |
661 | edma_writeb(fsl_edma, EDMA_CINT_CINT(ch), | |
662 | base_addr + EDMA_CINT); | |
663 | ||
664 | fsl_chan = &fsl_edma->chans[ch]; | |
665 | ||
666 | spin_lock(&fsl_chan->vchan.lock); | |
667 | if (!fsl_chan->edesc->iscyclic) { | |
668 | list_del(&fsl_chan->edesc->vdesc.node); | |
669 | vchan_cookie_complete(&fsl_chan->edesc->vdesc); | |
670 | fsl_chan->edesc = NULL; | |
671 | fsl_chan->status = DMA_COMPLETE; | |
672 | } else { | |
673 | vchan_cyclic_callback(&fsl_chan->edesc->vdesc); | |
674 | } | |
675 | ||
676 | if (!fsl_chan->edesc) | |
677 | fsl_edma_xfer_desc(fsl_chan); | |
678 | ||
679 | spin_unlock(&fsl_chan->vchan.lock); | |
680 | } | |
681 | } | |
682 | return IRQ_HANDLED; | |
683 | } | |
684 | ||
685 | static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id) | |
686 | { | |
687 | struct fsl_edma_engine *fsl_edma = dev_id; | |
688 | unsigned int err, ch; | |
689 | ||
690 | err = edma_readl(fsl_edma, fsl_edma->membase + EDMA_ERR); | |
691 | if (!err) | |
692 | return IRQ_NONE; | |
693 | ||
694 | for (ch = 0; ch < fsl_edma->n_chans; ch++) { | |
695 | if (err & (0x1 << ch)) { | |
696 | fsl_edma_disable_request(&fsl_edma->chans[ch]); | |
697 | edma_writeb(fsl_edma, EDMA_CERR_CERR(ch), | |
698 | fsl_edma->membase + EDMA_CERR); | |
699 | fsl_edma->chans[ch].status = DMA_ERROR; | |
700 | } | |
701 | } | |
702 | return IRQ_HANDLED; | |
703 | } | |
704 | ||
705 | static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id) | |
706 | { | |
707 | if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED) | |
708 | return IRQ_HANDLED; | |
709 | ||
710 | return fsl_edma_err_handler(irq, dev_id); | |
711 | } | |
712 | ||
713 | static void fsl_edma_issue_pending(struct dma_chan *chan) | |
714 | { | |
715 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); | |
716 | unsigned long flags; | |
717 | ||
718 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); | |
719 | ||
720 | if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc) | |
721 | fsl_edma_xfer_desc(fsl_chan); | |
722 | ||
723 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); | |
724 | } | |
725 | ||
726 | static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec, | |
727 | struct of_dma *ofdma) | |
728 | { | |
729 | struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data; | |
178c81e5 | 730 | struct dma_chan *chan, *_chan; |
211bfef7 | 731 | unsigned long chans_per_mux = fsl_edma->n_chans / DMAMUX_NR; |
d6be34fb JL |
732 | |
733 | if (dma_spec->args_count != 2) | |
734 | return NULL; | |
735 | ||
736 | mutex_lock(&fsl_edma->fsl_edma_mutex); | |
178c81e5 | 737 | list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) { |
d6be34fb JL |
738 | if (chan->client_count) |
739 | continue; | |
211bfef7 | 740 | if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) { |
d6be34fb JL |
741 | chan = dma_get_slave_channel(chan); |
742 | if (chan) { | |
743 | chan->device->privatecnt++; | |
744 | fsl_edma_chan_mux(to_fsl_edma_chan(chan), | |
745 | dma_spec->args[1], true); | |
746 | mutex_unlock(&fsl_edma->fsl_edma_mutex); | |
747 | return chan; | |
748 | } | |
749 | } | |
750 | } | |
751 | mutex_unlock(&fsl_edma->fsl_edma_mutex); | |
752 | return NULL; | |
753 | } | |
754 | ||
755 | static int fsl_edma_alloc_chan_resources(struct dma_chan *chan) | |
756 | { | |
757 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); | |
758 | ||
759 | fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev, | |
760 | sizeof(struct fsl_edma_hw_tcd), | |
761 | 32, 0); | |
762 | return 0; | |
763 | } | |
764 | ||
765 | static void fsl_edma_free_chan_resources(struct dma_chan *chan) | |
766 | { | |
767 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); | |
768 | unsigned long flags; | |
769 | LIST_HEAD(head); | |
770 | ||
771 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); | |
772 | fsl_edma_disable_request(fsl_chan); | |
773 | fsl_edma_chan_mux(fsl_chan, 0, false); | |
774 | fsl_chan->edesc = NULL; | |
775 | vchan_get_all_descriptors(&fsl_chan->vchan, &head); | |
776 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); | |
777 | ||
778 | vchan_dma_desc_free_list(&fsl_chan->vchan, &head); | |
779 | dma_pool_destroy(fsl_chan->tcd_pool); | |
780 | fsl_chan->tcd_pool = NULL; | |
781 | } | |
782 | ||
783 | static int fsl_dma_device_slave_caps(struct dma_chan *dchan, | |
784 | struct dma_slave_caps *caps) | |
785 | { | |
786 | caps->src_addr_widths = FSL_EDMA_BUSWIDTHS; | |
ceacbdbf | 787 | caps->dst_addr_widths = FSL_EDMA_BUSWIDTHS; |
d6be34fb JL |
788 | caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); |
789 | caps->cmd_pause = true; | |
790 | caps->cmd_terminate = true; | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
795 | static int | |
796 | fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma) | |
797 | { | |
798 | int ret; | |
799 | ||
800 | fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx"); | |
801 | if (fsl_edma->txirq < 0) { | |
802 | dev_err(&pdev->dev, "Can't get edma-tx irq.\n"); | |
803 | return fsl_edma->txirq; | |
804 | } | |
805 | ||
806 | fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err"); | |
807 | if (fsl_edma->errirq < 0) { | |
808 | dev_err(&pdev->dev, "Can't get edma-err irq.\n"); | |
809 | return fsl_edma->errirq; | |
810 | } | |
811 | ||
812 | if (fsl_edma->txirq == fsl_edma->errirq) { | |
813 | ret = devm_request_irq(&pdev->dev, fsl_edma->txirq, | |
814 | fsl_edma_irq_handler, 0, "eDMA", fsl_edma); | |
815 | if (ret) { | |
816 | dev_err(&pdev->dev, "Can't register eDMA IRQ.\n"); | |
817 | return ret; | |
818 | } | |
819 | } else { | |
820 | ret = devm_request_irq(&pdev->dev, fsl_edma->txirq, | |
821 | fsl_edma_tx_handler, 0, "eDMA tx", fsl_edma); | |
822 | if (ret) { | |
823 | dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n"); | |
824 | return ret; | |
825 | } | |
826 | ||
827 | ret = devm_request_irq(&pdev->dev, fsl_edma->errirq, | |
828 | fsl_edma_err_handler, 0, "eDMA err", fsl_edma); | |
829 | if (ret) { | |
830 | dev_err(&pdev->dev, "Can't register eDMA err IRQ.\n"); | |
831 | return ret; | |
832 | } | |
833 | } | |
834 | ||
835 | return 0; | |
836 | } | |
837 | ||
838 | static int fsl_edma_probe(struct platform_device *pdev) | |
839 | { | |
840 | struct device_node *np = pdev->dev.of_node; | |
841 | struct fsl_edma_engine *fsl_edma; | |
842 | struct fsl_edma_chan *fsl_chan; | |
843 | struct resource *res; | |
844 | int len, chans; | |
845 | int ret, i; | |
846 | ||
847 | ret = of_property_read_u32(np, "dma-channels", &chans); | |
848 | if (ret) { | |
849 | dev_err(&pdev->dev, "Can't get dma-channels.\n"); | |
850 | return ret; | |
851 | } | |
852 | ||
853 | len = sizeof(*fsl_edma) + sizeof(*fsl_chan) * chans; | |
854 | fsl_edma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL); | |
855 | if (!fsl_edma) | |
856 | return -ENOMEM; | |
857 | ||
858 | fsl_edma->n_chans = chans; | |
859 | mutex_init(&fsl_edma->fsl_edma_mutex); | |
860 | ||
861 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
862 | fsl_edma->membase = devm_ioremap_resource(&pdev->dev, res); | |
863 | if (IS_ERR(fsl_edma->membase)) | |
864 | return PTR_ERR(fsl_edma->membase); | |
865 | ||
866 | for (i = 0; i < DMAMUX_NR; i++) { | |
867 | char clkname[32]; | |
868 | ||
869 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i); | |
870 | fsl_edma->muxbase[i] = devm_ioremap_resource(&pdev->dev, res); | |
871 | if (IS_ERR(fsl_edma->muxbase[i])) | |
872 | return PTR_ERR(fsl_edma->muxbase[i]); | |
873 | ||
874 | sprintf(clkname, "dmamux%d", i); | |
875 | fsl_edma->muxclk[i] = devm_clk_get(&pdev->dev, clkname); | |
876 | if (IS_ERR(fsl_edma->muxclk[i])) { | |
877 | dev_err(&pdev->dev, "Missing DMAMUX block clock.\n"); | |
878 | return PTR_ERR(fsl_edma->muxclk[i]); | |
879 | } | |
880 | ||
881 | ret = clk_prepare_enable(fsl_edma->muxclk[i]); | |
882 | if (ret) { | |
883 | dev_err(&pdev->dev, "DMAMUX clk block failed.\n"); | |
884 | return ret; | |
885 | } | |
886 | ||
887 | } | |
888 | ||
889 | ret = fsl_edma_irq_init(pdev, fsl_edma); | |
890 | if (ret) | |
891 | return ret; | |
892 | ||
893 | fsl_edma->big_endian = of_property_read_bool(np, "big-endian"); | |
894 | ||
895 | INIT_LIST_HEAD(&fsl_edma->dma_dev.channels); | |
896 | for (i = 0; i < fsl_edma->n_chans; i++) { | |
897 | struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i]; | |
898 | ||
899 | fsl_chan->edma = fsl_edma; | |
900 | ||
901 | fsl_chan->vchan.desc_free = fsl_edma_free_desc; | |
902 | vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev); | |
903 | ||
904 | edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i)); | |
905 | fsl_edma_chan_mux(fsl_chan, 0, false); | |
906 | } | |
907 | ||
908 | dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask); | |
909 | dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask); | |
910 | dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask); | |
911 | ||
912 | fsl_edma->dma_dev.dev = &pdev->dev; | |
913 | fsl_edma->dma_dev.device_alloc_chan_resources | |
914 | = fsl_edma_alloc_chan_resources; | |
915 | fsl_edma->dma_dev.device_free_chan_resources | |
916 | = fsl_edma_free_chan_resources; | |
917 | fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status; | |
918 | fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg; | |
919 | fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic; | |
920 | fsl_edma->dma_dev.device_control = fsl_edma_control; | |
921 | fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending; | |
922 | fsl_edma->dma_dev.device_slave_caps = fsl_dma_device_slave_caps; | |
923 | ||
924 | platform_set_drvdata(pdev, fsl_edma); | |
925 | ||
926 | ret = dma_async_device_register(&fsl_edma->dma_dev); | |
927 | if (ret) { | |
928 | dev_err(&pdev->dev, "Can't register Freescale eDMA engine.\n"); | |
929 | return ret; | |
930 | } | |
931 | ||
932 | ret = of_dma_controller_register(np, fsl_edma_xlate, fsl_edma); | |
933 | if (ret) { | |
934 | dev_err(&pdev->dev, "Can't register Freescale eDMA of_dma.\n"); | |
935 | dma_async_device_unregister(&fsl_edma->dma_dev); | |
936 | return ret; | |
937 | } | |
938 | ||
939 | /* enable round robin arbitration */ | |
940 | edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, fsl_edma->membase + EDMA_CR); | |
941 | ||
942 | return 0; | |
943 | } | |
944 | ||
945 | static int fsl_edma_remove(struct platform_device *pdev) | |
946 | { | |
947 | struct device_node *np = pdev->dev.of_node; | |
948 | struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev); | |
949 | int i; | |
950 | ||
951 | of_dma_controller_free(np); | |
952 | dma_async_device_unregister(&fsl_edma->dma_dev); | |
953 | ||
954 | for (i = 0; i < DMAMUX_NR; i++) | |
955 | clk_disable_unprepare(fsl_edma->muxclk[i]); | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
960 | static const struct of_device_id fsl_edma_dt_ids[] = { | |
961 | { .compatible = "fsl,vf610-edma", }, | |
962 | { /* sentinel */ } | |
963 | }; | |
964 | MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids); | |
965 | ||
966 | static struct platform_driver fsl_edma_driver = { | |
967 | .driver = { | |
968 | .name = "fsl-edma", | |
d6be34fb JL |
969 | .of_match_table = fsl_edma_dt_ids, |
970 | }, | |
971 | .probe = fsl_edma_probe, | |
972 | .remove = fsl_edma_remove, | |
973 | }; | |
974 | ||
8edc51c1 YY |
975 | static int __init fsl_edma_init(void) |
976 | { | |
977 | return platform_driver_register(&fsl_edma_driver); | |
978 | } | |
979 | subsys_initcall(fsl_edma_init); | |
980 | ||
981 | static void __exit fsl_edma_exit(void) | |
982 | { | |
983 | platform_driver_unregister(&fsl_edma_driver); | |
984 | } | |
985 | module_exit(fsl_edma_exit); | |
d6be34fb JL |
986 | |
987 | MODULE_ALIAS("platform:fsl-edma"); | |
988 | MODULE_DESCRIPTION("Freescale eDMA engine driver"); | |
989 | MODULE_LICENSE("GPL v2"); |