1 /*
2 * This is for Renesas R-Car Audio-DMAC-peri-peri.
3 *
4 * Copyright (C) 2014 Renesas Electronics Corporation
5 * Copyright (C) 2014 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6 *
7 * based on the drivers/dma/sh/shdma.c
8 *
9 * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
10 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
11 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
12 * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
13 *
14 * This is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 */
20 #include <linux/delay.h>
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/slab.h>
24 #include <linux/dmaengine.h>
25 #include <linux/of_dma.h>
26 #include <linux/platform_data/dma-rcar-audmapp.h>
27 #include <linux/platform_device.h>
28 #include <linux/shdma-base.h>
29
30 /*
31 * DMA register
32 */
33 #define PDMASAR 0x00
34 #define PDMADAR 0x04
35 #define PDMACHCR 0x0c
36
37 /* PDMACHCR */
38 #define PDMACHCR_DE (1 << 0)
39
40 #define AUDMAPP_MAX_CHANNELS 29
41
42 /* Default MEMCPY transfer size = 2^2 = 4 bytes */
43 #define LOG2_DEFAULT_XFER_SIZE 2
44 #define AUDMAPP_SLAVE_NUMBER 256
45 #define AUDMAPP_LEN_MAX (16 * 1024 * 1024)
46
47 struct audmapp_chan {
48 struct shdma_chan shdma_chan;
49 void __iomem *base;
50 dma_addr_t slave_addr;
51 u32 chcr;
52 };
53
54 struct audmapp_device {
55 struct shdma_dev shdma_dev;
56 struct audmapp_pdata *pdata;
57 struct device *dev;
58 void __iomem *chan_reg;
59 };
60
61 struct audmapp_desc {
62 struct shdma_desc shdma_desc;
63 dma_addr_t src;
64 dma_addr_t dst;
65 };
66
67 #define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
68
69 #define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan)
70 #define to_desc(sdesc) container_of(sdesc, struct audmapp_desc, shdma_desc)
71 #define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device, \
72 struct audmapp_device, shdma_dev.dma_dev)
73
audmapp_write(struct audmapp_chan * auchan,u32 data,u32 reg)74 static void audmapp_write(struct audmapp_chan *auchan, u32 data, u32 reg)
75 {
76 struct audmapp_device *audev = to_dev(auchan);
77 struct device *dev = audev->dev;
78
79 dev_dbg(dev, "w %p : %08x\n", auchan->base + reg, data);
80
81 iowrite32(data, auchan->base + reg);
82 }
83
audmapp_read(struct audmapp_chan * auchan,u32 reg)84 static u32 audmapp_read(struct audmapp_chan *auchan, u32 reg)
85 {
86 return ioread32(auchan->base + reg);
87 }
88
audmapp_halt(struct shdma_chan * schan)89 static void audmapp_halt(struct shdma_chan *schan)
90 {
91 struct audmapp_chan *auchan = to_chan(schan);
92 int i;
93
94 audmapp_write(auchan, 0, PDMACHCR);
95
96 for (i = 0; i < 1024; i++) {
97 if (0 == audmapp_read(auchan, PDMACHCR))
98 return;
99 udelay(1);
100 }
101 }
102
audmapp_start_xfer(struct shdma_chan * schan,struct shdma_desc * sdesc)103 static void audmapp_start_xfer(struct shdma_chan *schan,
104 struct shdma_desc *sdesc)
105 {
106 struct audmapp_chan *auchan = to_chan(schan);
107 struct audmapp_device *audev = to_dev(auchan);
108 struct audmapp_desc *desc = to_desc(sdesc);
109 struct device *dev = audev->dev;
110 u32 chcr = auchan->chcr | PDMACHCR_DE;
111
112 dev_dbg(dev, "src/dst/chcr = %pad/%pad/%08x\n",
113 &desc->src, &desc->dst, chcr);
114
115 audmapp_write(auchan, desc->src, PDMASAR);
116 audmapp_write(auchan, desc->dst, PDMADAR);
117 audmapp_write(auchan, chcr, PDMACHCR);
118 }
119
audmapp_get_config(struct audmapp_chan * auchan,int slave_id,u32 * chcr,dma_addr_t * dst)120 static int audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
121 u32 *chcr, dma_addr_t *dst)
122 {
123 struct audmapp_device *audev = to_dev(auchan);
124 struct audmapp_pdata *pdata = audev->pdata;
125 struct audmapp_slave_config *cfg;
126 int i;
127
128 *chcr = 0;
129 *dst = 0;
130
131 if (!pdata) { /* DT */
132 *chcr = ((u32)slave_id) << 16;
133 auchan->shdma_chan.slave_id = (slave_id) >> 8;
134 return 0;
135 }
136
137 /* non-DT */
138
139 if (slave_id >= AUDMAPP_SLAVE_NUMBER)
140 return -ENXIO;
141
142 for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
143 if (cfg->slave_id == slave_id) {
144 *chcr = cfg->chcr;
145 *dst = cfg->dst;
146 return 0;
147 }
148
149 return -ENXIO;
150 }
151
audmapp_set_slave(struct shdma_chan * schan,int slave_id,dma_addr_t slave_addr,bool try)152 static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,
153 dma_addr_t slave_addr, bool try)
154 {
155 struct audmapp_chan *auchan = to_chan(schan);
156 u32 chcr;
157 dma_addr_t dst;
158 int ret;
159
160 ret = audmapp_get_config(auchan, slave_id, &chcr, &dst);
161 if (ret < 0)
162 return ret;
163
164 if (try)
165 return 0;
166
167 auchan->chcr = chcr;
168 auchan->slave_addr = slave_addr ? : dst;
169
170 return 0;
171 }
172
audmapp_desc_setup(struct shdma_chan * schan,struct shdma_desc * sdesc,dma_addr_t src,dma_addr_t dst,size_t * len)173 static int audmapp_desc_setup(struct shdma_chan *schan,
174 struct shdma_desc *sdesc,
175 dma_addr_t src, dma_addr_t dst, size_t *len)
176 {
177 struct audmapp_desc *desc = to_desc(sdesc);
178
179 if (*len > (size_t)AUDMAPP_LEN_MAX)
180 *len = (size_t)AUDMAPP_LEN_MAX;
181
182 desc->src = src;
183 desc->dst = dst;
184
185 return 0;
186 }
187
audmapp_setup_xfer(struct shdma_chan * schan,int slave_id)188 static void audmapp_setup_xfer(struct shdma_chan *schan,
189 int slave_id)
190 {
191 }
192
audmapp_slave_addr(struct shdma_chan * schan)193 static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan)
194 {
195 struct audmapp_chan *auchan = to_chan(schan);
196
197 return auchan->slave_addr;
198 }
199
audmapp_channel_busy(struct shdma_chan * schan)200 static bool audmapp_channel_busy(struct shdma_chan *schan)
201 {
202 struct audmapp_chan *auchan = to_chan(schan);
203 u32 chcr = audmapp_read(auchan, PDMACHCR);
204
205 return chcr & ~PDMACHCR_DE;
206 }
207
audmapp_desc_completed(struct shdma_chan * schan,struct shdma_desc * sdesc)208 static bool audmapp_desc_completed(struct shdma_chan *schan,
209 struct shdma_desc *sdesc)
210 {
211 return true;
212 }
213
audmapp_embedded_desc(void * buf,int i)214 static struct shdma_desc *audmapp_embedded_desc(void *buf, int i)
215 {
216 return &((struct audmapp_desc *)buf)[i].shdma_desc;
217 }
218
219 static const struct shdma_ops audmapp_shdma_ops = {
220 .halt_channel = audmapp_halt,
221 .desc_setup = audmapp_desc_setup,
222 .set_slave = audmapp_set_slave,
223 .start_xfer = audmapp_start_xfer,
224 .embedded_desc = audmapp_embedded_desc,
225 .setup_xfer = audmapp_setup_xfer,
226 .slave_addr = audmapp_slave_addr,
227 .channel_busy = audmapp_channel_busy,
228 .desc_completed = audmapp_desc_completed,
229 };
230
audmapp_chan_probe(struct platform_device * pdev,struct audmapp_device * audev,int id)231 static int audmapp_chan_probe(struct platform_device *pdev,
232 struct audmapp_device *audev, int id)
233 {
234 struct shdma_dev *sdev = &audev->shdma_dev;
235 struct audmapp_chan *auchan;
236 struct shdma_chan *schan;
237 struct device *dev = audev->dev;
238
239 auchan = devm_kzalloc(dev, sizeof(*auchan), GFP_KERNEL);
240 if (!auchan)
241 return -ENOMEM;
242
243 schan = &auchan->shdma_chan;
244 schan->max_xfer_len = AUDMAPP_LEN_MAX;
245
246 shdma_chan_probe(sdev, schan, id);
247
248 auchan->base = audev->chan_reg + 0x20 + (0x10 * id);
249 dev_dbg(dev, "%02d : %p / %p", id, auchan->base, audev->chan_reg);
250
251 return 0;
252 }
253
audmapp_chan_remove(struct audmapp_device * audev)254 static void audmapp_chan_remove(struct audmapp_device *audev)
255 {
256 struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;
257 struct shdma_chan *schan;
258 int i;
259
260 shdma_for_each_chan(schan, &audev->shdma_dev, i) {
261 BUG_ON(!schan);
262 shdma_chan_remove(schan);
263 }
264 dma_dev->chancnt = 0;
265 }
266
audmapp_of_xlate(struct of_phandle_args * dma_spec,struct of_dma * ofdma)267 static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec,
268 struct of_dma *ofdma)
269 {
270 dma_cap_mask_t mask;
271 struct dma_chan *chan;
272 u32 chcr = dma_spec->args[0];
273
274 if (dma_spec->args_count != 1)
275 return NULL;
276
277 dma_cap_zero(mask);
278 dma_cap_set(DMA_SLAVE, mask);
279
280 chan = dma_request_channel(mask, shdma_chan_filter, NULL);
281 if (chan)
282 to_shdma_chan(chan)->hw_req = chcr;
283
284 return chan;
285 }
286
audmapp_probe(struct platform_device * pdev)287 static int audmapp_probe(struct platform_device *pdev)
288 {
289 struct audmapp_pdata *pdata = pdev->dev.platform_data;
290 struct device_node *np = pdev->dev.of_node;
291 struct audmapp_device *audev;
292 struct shdma_dev *sdev;
293 struct dma_device *dma_dev;
294 struct resource *res;
295 int err, i;
296
297 if (np)
298 of_dma_controller_register(np, audmapp_of_xlate, pdev);
299 else if (!pdata)
300 return -ENODEV;
301
302 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
303
304 audev = devm_kzalloc(&pdev->dev, sizeof(*audev), GFP_KERNEL);
305 if (!audev)
306 return -ENOMEM;
307
308 audev->dev = &pdev->dev;
309 audev->pdata = pdata;
310 audev->chan_reg = devm_ioremap_resource(&pdev->dev, res);
311 if (IS_ERR(audev->chan_reg))
312 return PTR_ERR(audev->chan_reg);
313
314 sdev = &audev->shdma_dev;
315 sdev->ops = &audmapp_shdma_ops;
316 sdev->desc_size = sizeof(struct audmapp_desc);
317
318 dma_dev = &sdev->dma_dev;
319 dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
320 dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
321
322 err = shdma_init(&pdev->dev, sdev, AUDMAPP_MAX_CHANNELS);
323 if (err < 0)
324 return err;
325
326 platform_set_drvdata(pdev, audev);
327
328 /* Create DMA Channel */
329 for (i = 0; i < AUDMAPP_MAX_CHANNELS; i++) {
330 err = audmapp_chan_probe(pdev, audev, i);
331 if (err)
332 goto chan_probe_err;
333 }
334
335 err = dma_async_device_register(dma_dev);
336 if (err < 0)
337 goto chan_probe_err;
338
339 return err;
340
341 chan_probe_err:
342 audmapp_chan_remove(audev);
343 shdma_cleanup(sdev);
344
345 return err;
346 }
347
audmapp_remove(struct platform_device * pdev)348 static int audmapp_remove(struct platform_device *pdev)
349 {
350 struct audmapp_device *audev = platform_get_drvdata(pdev);
351 struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;
352
353 dma_async_device_unregister(dma_dev);
354
355 audmapp_chan_remove(audev);
356 shdma_cleanup(&audev->shdma_dev);
357
358 return 0;
359 }
360
361 static const struct of_device_id audmapp_of_match[] = {
362 { .compatible = "renesas,rcar-audmapp", },
363 {},
364 };
365
366 static struct platform_driver audmapp_driver = {
367 .probe = audmapp_probe,
368 .remove = audmapp_remove,
369 .driver = {
370 .owner = THIS_MODULE,
371 .name = "rcar-audmapp-engine",
372 .of_match_table = audmapp_of_match,
373 },
374 };
375 module_platform_driver(audmapp_driver);
376
377 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
378 MODULE_DESCRIPTION("Renesas R-Car Audio DMAC peri-peri driver");
379 MODULE_LICENSE("GPL");
380