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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
32
33#define PDMASAR 0x00
34#define PDMADAR 0x04
35#define PDMACHCR 0x0c
36
37
38#define PDMACHCR_DE (1 << 0)
39
40#define AUDMAPP_MAX_CHANNELS 29
41
42
43#define LOG2_DEFAULT_XFER_SIZE 2
44#define AUDMAPP_SLAVE_NUMBER 256
45#define AUDMAPP_LEN_MAX (16 * 1024 * 1024)
46
47struct audmapp_chan {
48 struct shdma_chan shdma_chan;
49 void __iomem *base;
50 dma_addr_t slave_addr;
51 u32 chcr;
52};
53
54struct audmapp_device {
55 struct shdma_dev shdma_dev;
56 struct audmapp_pdata *pdata;
57 struct device *dev;
58 void __iomem *chan_reg;
59};
60
61struct 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
74static 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
84static u32 audmapp_read(struct audmapp_chan *auchan, u32 reg)
85{
86 return ioread32(auchan->base + reg);
87}
88
89static 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
103static 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
120static 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) {
132 *chcr = ((u32)slave_id) << 16;
133 auchan->shdma_chan.slave_id = (slave_id) >> 8;
134 return 0;
135 }
136
137
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
152static 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
173static 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
188static void audmapp_setup_xfer(struct shdma_chan *schan,
189 int slave_id)
190{
191}
192
193static 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
200static 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
208static bool audmapp_desc_completed(struct shdma_chan *schan,
209 struct shdma_desc *sdesc)
210{
211 return true;
212}
213
214static struct shdma_desc *audmapp_embedded_desc(void *buf, int i)
215{
216 return &((struct audmapp_desc *)buf)[i].shdma_desc;
217}
218
219static 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
231static 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
254static void audmapp_chan_remove(struct audmapp_device *audev)
255{
256 struct shdma_chan *schan;
257 int i;
258
259 shdma_for_each_chan(schan, &audev->shdma_dev, i) {
260 BUG_ON(!schan);
261 shdma_chan_remove(schan);
262 }
263}
264
265static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec,
266 struct of_dma *ofdma)
267{
268 dma_cap_mask_t mask;
269 struct dma_chan *chan;
270 u32 chcr = dma_spec->args[0];
271
272 if (dma_spec->args_count != 1)
273 return NULL;
274
275 dma_cap_zero(mask);
276 dma_cap_set(DMA_SLAVE, mask);
277
278 chan = dma_request_channel(mask, shdma_chan_filter, NULL);
279 if (chan)
280 to_shdma_chan(chan)->hw_req = chcr;
281
282 return chan;
283}
284
285static int audmapp_probe(struct platform_device *pdev)
286{
287 struct audmapp_pdata *pdata = pdev->dev.platform_data;
288 struct device_node *np = pdev->dev.of_node;
289 struct audmapp_device *audev;
290 struct shdma_dev *sdev;
291 struct dma_device *dma_dev;
292 struct resource *res;
293 int err, i;
294
295 if (np)
296 of_dma_controller_register(np, audmapp_of_xlate, pdev);
297 else if (!pdata)
298 return -ENODEV;
299
300 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
301
302 audev = devm_kzalloc(&pdev->dev, sizeof(*audev), GFP_KERNEL);
303 if (!audev)
304 return -ENOMEM;
305
306 audev->dev = &pdev->dev;
307 audev->pdata = pdata;
308 audev->chan_reg = devm_ioremap_resource(&pdev->dev, res);
309 if (IS_ERR(audev->chan_reg))
310 return PTR_ERR(audev->chan_reg);
311
312 sdev = &audev->shdma_dev;
313 sdev->ops = &audmapp_shdma_ops;
314 sdev->desc_size = sizeof(struct audmapp_desc);
315
316 dma_dev = &sdev->dma_dev;
317 dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
318 dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
319
320 err = shdma_init(&pdev->dev, sdev, AUDMAPP_MAX_CHANNELS);
321 if (err < 0)
322 return err;
323
324 platform_set_drvdata(pdev, audev);
325
326
327 for (i = 0; i < AUDMAPP_MAX_CHANNELS; i++) {
328 err = audmapp_chan_probe(pdev, audev, i);
329 if (err)
330 goto chan_probe_err;
331 }
332
333 err = dma_async_device_register(dma_dev);
334 if (err < 0)
335 goto chan_probe_err;
336
337 return err;
338
339chan_probe_err:
340 audmapp_chan_remove(audev);
341 shdma_cleanup(sdev);
342
343 return err;
344}
345
346static int audmapp_remove(struct platform_device *pdev)
347{
348 struct audmapp_device *audev = platform_get_drvdata(pdev);
349 struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;
350
351 dma_async_device_unregister(dma_dev);
352
353 audmapp_chan_remove(audev);
354 shdma_cleanup(&audev->shdma_dev);
355
356 return 0;
357}
358
359static const struct of_device_id audmapp_of_match[] = {
360 { .compatible = "renesas,rcar-audmapp", },
361 {},
362};
363
364static struct platform_driver audmapp_driver = {
365 .probe = audmapp_probe,
366 .remove = audmapp_remove,
367 .driver = {
368 .name = "rcar-audmapp-engine",
369 .of_match_table = audmapp_of_match,
370 },
371};
372module_platform_driver(audmapp_driver);
373
374MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
375MODULE_DESCRIPTION("Renesas R-Car Audio DMAC peri-peri driver");
376MODULE_LICENSE("GPL");
377
