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8380222e SH |
1 | /* |
2 | * imx-ssi.c -- ALSA Soc Audio Layer | |
3 | * | |
4 | * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> | |
5 | * | |
6 | * This code is based on code copyrighted by Freescale, | |
7 | * Liam Girdwood, Javier Martin and probably others. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | * | |
15 | * The i.MX SSI core has some nasty limitations in AC97 mode. While most | |
16 | * sane processor vendors have a FIFO per AC97 slot, the i.MX has only | |
17 | * one FIFO which combines all valid receive slots. We cannot even select | |
18 | * which slots we want to receive. The WM9712 with which this driver | |
19 | * was developped with always sends GPIO status data in slot 12 which | |
20 | * we receive in our (PCM-) data stream. The only chance we have is to | |
21 | * manually skip this data in the FIQ handler. With sampling rates different | |
22 | * from 48000Hz not every frame has valid receive data, so the ratio | |
23 | * between pcm data and GPIO status data changes. Our FIQ handler is not | |
24 | * able to handle this, hence this driver only works with 48000Hz sampling | |
25 | * rate. | |
26 | * Reading and writing AC97 registers is another challange. The core | |
27 | * provides us status bits when the read register is updated with *another* | |
28 | * value. When we read the same register two times (and the register still | |
29 | * contains the same value) these status bits are not set. We work | |
30 | * around this by not polling these bits but only wait a fixed delay. | |
31 | * | |
32 | */ | |
33 | ||
34 | #include <linux/clk.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/device.h> | |
37 | #include <linux/dma-mapping.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/interrupt.h> | |
40 | #include <linux/module.h> | |
41 | #include <linux/platform_device.h> | |
42 | ||
43 | #include <sound/core.h> | |
44 | #include <sound/initval.h> | |
45 | #include <sound/pcm.h> | |
46 | #include <sound/pcm_params.h> | |
47 | #include <sound/soc.h> | |
48 | ||
49 | #include <mach/ssi.h> | |
50 | #include <mach/hardware.h> | |
51 | ||
52 | #include "imx-ssi.h" | |
53 | ||
54 | #define SSI_SACNT_DEFAULT (SSI_SACNT_AC97EN | SSI_SACNT_FV) | |
55 | ||
56 | /* | |
57 | * SSI Network Mode or TDM slots configuration. | |
58 | * Should only be called when port is inactive (i.e. SSIEN = 0). | |
59 | */ | |
60 | static int imx_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, | |
61 | unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width) | |
62 | { | |
48dbc419 | 63 | struct imx_ssi *ssi = cpu_dai->private_data; |
8380222e SH |
64 | u32 sccr; |
65 | ||
66 | sccr = readl(ssi->base + SSI_STCCR); | |
67 | sccr &= ~SSI_STCCR_DC_MASK; | |
68 | sccr |= SSI_STCCR_DC(slots - 1); | |
69 | writel(sccr, ssi->base + SSI_STCCR); | |
70 | ||
71 | sccr = readl(ssi->base + SSI_SRCCR); | |
72 | sccr &= ~SSI_STCCR_DC_MASK; | |
73 | sccr |= SSI_STCCR_DC(slots - 1); | |
74 | writel(sccr, ssi->base + SSI_SRCCR); | |
75 | ||
76 | writel(tx_mask, ssi->base + SSI_STMSK); | |
77 | writel(rx_mask, ssi->base + SSI_SRMSK); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | /* | |
83 | * SSI DAI format configuration. | |
84 | * Should only be called when port is inactive (i.e. SSIEN = 0). | |
85 | * Note: We don't use the I2S modes but instead manually configure the | |
86 | * SSI for I2S because the I2S mode is only a register preset. | |
87 | */ | |
88 | static int imx_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) | |
89 | { | |
48dbc419 | 90 | struct imx_ssi *ssi = cpu_dai->private_data; |
8380222e SH |
91 | u32 strcr = 0, scr; |
92 | ||
93 | scr = readl(ssi->base + SSI_SCR) & ~(SSI_SCR_SYN | SSI_SCR_NET); | |
94 | ||
95 | /* DAI mode */ | |
96 | switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { | |
97 | case SND_SOC_DAIFMT_I2S: | |
98 | /* data on rising edge of bclk, frame low 1clk before data */ | |
99 | strcr |= SSI_STCR_TFSI | SSI_STCR_TEFS | SSI_STCR_TXBIT0; | |
100 | scr |= SSI_SCR_NET; | |
101 | break; | |
102 | case SND_SOC_DAIFMT_LEFT_J: | |
103 | /* data on rising edge of bclk, frame high with data */ | |
104 | strcr |= SSI_STCR_TXBIT0; | |
105 | break; | |
106 | case SND_SOC_DAIFMT_DSP_B: | |
107 | /* data on rising edge of bclk, frame high with data */ | |
108 | strcr |= SSI_STCR_TFSL; | |
109 | break; | |
110 | case SND_SOC_DAIFMT_DSP_A: | |
111 | /* data on rising edge of bclk, frame high 1clk before data */ | |
112 | strcr |= SSI_STCR_TFSL | SSI_STCR_TEFS; | |
113 | break; | |
114 | } | |
115 | ||
116 | /* DAI clock inversion */ | |
117 | switch (fmt & SND_SOC_DAIFMT_INV_MASK) { | |
118 | case SND_SOC_DAIFMT_IB_IF: | |
119 | strcr |= SSI_STCR_TFSI; | |
120 | strcr &= ~SSI_STCR_TSCKP; | |
121 | break; | |
122 | case SND_SOC_DAIFMT_IB_NF: | |
123 | strcr &= ~(SSI_STCR_TSCKP | SSI_STCR_TFSI); | |
124 | break; | |
125 | case SND_SOC_DAIFMT_NB_IF: | |
126 | strcr |= SSI_STCR_TFSI | SSI_STCR_TSCKP; | |
127 | break; | |
128 | case SND_SOC_DAIFMT_NB_NF: | |
129 | strcr &= ~SSI_STCR_TFSI; | |
130 | strcr |= SSI_STCR_TSCKP; | |
131 | break; | |
132 | } | |
133 | ||
134 | /* DAI clock master masks */ | |
135 | switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { | |
d08a68bf | 136 | case SND_SOC_DAIFMT_CBM_CFM: |
8380222e | 137 | break; |
d08a68bf MB |
138 | default: |
139 | /* Master mode not implemented, needs handling of clocks. */ | |
140 | return -EINVAL; | |
8380222e SH |
141 | } |
142 | ||
143 | strcr |= SSI_STCR_TFEN0; | |
144 | ||
145 | writel(strcr, ssi->base + SSI_STCR); | |
146 | writel(strcr, ssi->base + SSI_SRCR); | |
147 | writel(scr, ssi->base + SSI_SCR); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | /* | |
153 | * SSI system clock configuration. | |
154 | * Should only be called when port is inactive (i.e. SSIEN = 0). | |
155 | */ | |
156 | static int imx_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai, | |
157 | int clk_id, unsigned int freq, int dir) | |
158 | { | |
48dbc419 | 159 | struct imx_ssi *ssi = cpu_dai->private_data; |
8380222e SH |
160 | u32 scr; |
161 | ||
162 | scr = readl(ssi->base + SSI_SCR); | |
163 | ||
164 | switch (clk_id) { | |
165 | case IMX_SSP_SYS_CLK: | |
166 | if (dir == SND_SOC_CLOCK_OUT) | |
167 | scr |= SSI_SCR_SYS_CLK_EN; | |
168 | else | |
169 | scr &= ~SSI_SCR_SYS_CLK_EN; | |
170 | break; | |
171 | default: | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
175 | writel(scr, ssi->base + SSI_SCR); | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | /* | |
181 | * SSI Clock dividers | |
182 | * Should only be called when port is inactive (i.e. SSIEN = 0). | |
183 | */ | |
184 | static int imx_ssi_set_dai_clkdiv(struct snd_soc_dai *cpu_dai, | |
185 | int div_id, int div) | |
186 | { | |
48dbc419 | 187 | struct imx_ssi *ssi = cpu_dai->private_data; |
8380222e SH |
188 | u32 stccr, srccr; |
189 | ||
190 | stccr = readl(ssi->base + SSI_STCCR); | |
191 | srccr = readl(ssi->base + SSI_SRCCR); | |
192 | ||
193 | switch (div_id) { | |
194 | case IMX_SSI_TX_DIV_2: | |
195 | stccr &= ~SSI_STCCR_DIV2; | |
196 | stccr |= div; | |
197 | break; | |
198 | case IMX_SSI_TX_DIV_PSR: | |
199 | stccr &= ~SSI_STCCR_PSR; | |
200 | stccr |= div; | |
201 | break; | |
202 | case IMX_SSI_TX_DIV_PM: | |
203 | stccr &= ~0xff; | |
204 | stccr |= SSI_STCCR_PM(div); | |
205 | break; | |
206 | case IMX_SSI_RX_DIV_2: | |
207 | stccr &= ~SSI_STCCR_DIV2; | |
208 | stccr |= div; | |
209 | break; | |
210 | case IMX_SSI_RX_DIV_PSR: | |
211 | stccr &= ~SSI_STCCR_PSR; | |
212 | stccr |= div; | |
213 | break; | |
214 | case IMX_SSI_RX_DIV_PM: | |
215 | stccr &= ~0xff; | |
216 | stccr |= SSI_STCCR_PM(div); | |
217 | break; | |
218 | default: | |
219 | return -EINVAL; | |
220 | } | |
221 | ||
222 | writel(stccr, ssi->base + SSI_STCCR); | |
223 | writel(srccr, ssi->base + SSI_SRCCR); | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Should only be called when port is inactive (i.e. SSIEN = 0), | |
230 | * although can be called multiple times by upper layers. | |
231 | */ | |
232 | static int imx_ssi_hw_params(struct snd_pcm_substream *substream, | |
233 | struct snd_pcm_hw_params *params, | |
234 | struct snd_soc_dai *cpu_dai) | |
235 | { | |
48dbc419 | 236 | struct imx_ssi *ssi = cpu_dai->private_data; |
8380222e SH |
237 | u32 reg, sccr; |
238 | ||
239 | /* Tx/Rx config */ | |
240 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
241 | reg = SSI_STCCR; | |
242 | cpu_dai->dma_data = &ssi->dma_params_tx; | |
243 | } else { | |
244 | reg = SSI_SRCCR; | |
245 | cpu_dai->dma_data = &ssi->dma_params_rx; | |
246 | } | |
247 | ||
248 | sccr = readl(ssi->base + reg) & ~SSI_STCCR_WL_MASK; | |
249 | ||
250 | /* DAI data (word) size */ | |
251 | switch (params_format(params)) { | |
252 | case SNDRV_PCM_FORMAT_S16_LE: | |
253 | sccr |= SSI_SRCCR_WL(16); | |
254 | break; | |
255 | case SNDRV_PCM_FORMAT_S20_3LE: | |
256 | sccr |= SSI_SRCCR_WL(20); | |
257 | break; | |
258 | case SNDRV_PCM_FORMAT_S24_LE: | |
259 | sccr |= SSI_SRCCR_WL(24); | |
260 | break; | |
261 | } | |
262 | ||
263 | writel(sccr, ssi->base + reg); | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
268 | static int imx_ssi_trigger(struct snd_pcm_substream *substream, int cmd, | |
269 | struct snd_soc_dai *dai) | |
270 | { | |
271 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
272 | struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; | |
48dbc419 | 273 | struct imx_ssi *ssi = cpu_dai->private_data; |
8380222e SH |
274 | unsigned int sier_bits, sier; |
275 | unsigned int scr; | |
276 | ||
277 | scr = readl(ssi->base + SSI_SCR); | |
278 | sier = readl(ssi->base + SSI_SIER); | |
279 | ||
280 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
281 | if (ssi->flags & IMX_SSI_DMA) | |
282 | sier_bits = SSI_SIER_TDMAE; | |
283 | else | |
284 | sier_bits = SSI_SIER_TIE | SSI_SIER_TFE0_EN; | |
285 | } else { | |
286 | if (ssi->flags & IMX_SSI_DMA) | |
287 | sier_bits = SSI_SIER_RDMAE; | |
288 | else | |
289 | sier_bits = SSI_SIER_RIE | SSI_SIER_RFF0_EN; | |
290 | } | |
291 | ||
292 | switch (cmd) { | |
293 | case SNDRV_PCM_TRIGGER_START: | |
294 | case SNDRV_PCM_TRIGGER_RESUME: | |
295 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
296 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
297 | scr |= SSI_SCR_TE; | |
298 | else | |
299 | scr |= SSI_SCR_RE; | |
300 | sier |= sier_bits; | |
301 | ||
302 | if (++ssi->enabled == 1) | |
303 | scr |= SSI_SCR_SSIEN; | |
304 | ||
305 | break; | |
306 | ||
307 | case SNDRV_PCM_TRIGGER_STOP: | |
308 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
309 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
310 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
311 | scr &= ~SSI_SCR_TE; | |
312 | else | |
313 | scr &= ~SSI_SCR_RE; | |
314 | sier &= ~sier_bits; | |
315 | ||
316 | if (--ssi->enabled == 0) | |
317 | scr &= ~SSI_SCR_SSIEN; | |
318 | ||
319 | break; | |
320 | default: | |
321 | return -EINVAL; | |
322 | } | |
323 | ||
324 | if (!(ssi->flags & IMX_SSI_USE_AC97)) | |
325 | /* rx/tx are always enabled to access ac97 registers */ | |
326 | writel(scr, ssi->base + SSI_SCR); | |
327 | ||
328 | writel(sier, ssi->base + SSI_SIER); | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | static struct snd_soc_dai_ops imx_ssi_pcm_dai_ops = { | |
334 | .hw_params = imx_ssi_hw_params, | |
335 | .set_fmt = imx_ssi_set_dai_fmt, | |
336 | .set_clkdiv = imx_ssi_set_dai_clkdiv, | |
337 | .set_sysclk = imx_ssi_set_dai_sysclk, | |
338 | .set_tdm_slot = imx_ssi_set_dai_tdm_slot, | |
339 | .trigger = imx_ssi_trigger, | |
340 | }; | |
341 | ||
342 | static struct snd_soc_dai imx_ssi_dai = { | |
343 | .playback = { | |
344 | .channels_min = 2, | |
345 | .channels_max = 2, | |
346 | .rates = SNDRV_PCM_RATE_8000_96000, | |
347 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
348 | }, | |
349 | .capture = { | |
350 | .channels_min = 2, | |
351 | .channels_max = 2, | |
352 | .rates = SNDRV_PCM_RATE_8000_96000, | |
353 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
354 | }, | |
355 | .ops = &imx_ssi_pcm_dai_ops, | |
356 | }; | |
357 | ||
358 | int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, | |
359 | struct vm_area_struct *vma) | |
360 | { | |
361 | struct snd_pcm_runtime *runtime = substream->runtime; | |
362 | int ret; | |
363 | ||
364 | ret = dma_mmap_coherent(NULL, vma, runtime->dma_area, | |
365 | runtime->dma_addr, runtime->dma_bytes); | |
366 | ||
367 | pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret, | |
368 | runtime->dma_area, | |
369 | runtime->dma_addr, | |
370 | runtime->dma_bytes); | |
371 | return ret; | |
372 | } | |
373 | ||
374 | static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
375 | { | |
376 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
377 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
378 | size_t size = IMX_SSI_DMABUF_SIZE; | |
379 | ||
380 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
381 | buf->dev.dev = pcm->card->dev; | |
382 | buf->private_data = NULL; | |
383 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
384 | &buf->addr, GFP_KERNEL); | |
385 | if (!buf->area) | |
386 | return -ENOMEM; | |
387 | buf->bytes = size; | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | static u64 imx_pcm_dmamask = DMA_BIT_MASK(32); | |
393 | ||
394 | int imx_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, | |
395 | struct snd_pcm *pcm) | |
396 | { | |
397 | ||
398 | int ret = 0; | |
399 | ||
400 | if (!card->dev->dma_mask) | |
401 | card->dev->dma_mask = &imx_pcm_dmamask; | |
402 | if (!card->dev->coherent_dma_mask) | |
403 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); | |
404 | if (dai->playback.channels_min) { | |
405 | ret = imx_pcm_preallocate_dma_buffer(pcm, | |
406 | SNDRV_PCM_STREAM_PLAYBACK); | |
407 | if (ret) | |
408 | goto out; | |
409 | } | |
410 | ||
411 | if (dai->capture.channels_min) { | |
412 | ret = imx_pcm_preallocate_dma_buffer(pcm, | |
413 | SNDRV_PCM_STREAM_CAPTURE); | |
414 | if (ret) | |
415 | goto out; | |
416 | } | |
417 | ||
418 | out: | |
419 | return ret; | |
420 | } | |
421 | ||
422 | void imx_pcm_free(struct snd_pcm *pcm) | |
423 | { | |
424 | struct snd_pcm_substream *substream; | |
425 | struct snd_dma_buffer *buf; | |
426 | int stream; | |
427 | ||
428 | for (stream = 0; stream < 2; stream++) { | |
429 | substream = pcm->streams[stream].substream; | |
430 | if (!substream) | |
431 | continue; | |
432 | ||
433 | buf = &substream->dma_buffer; | |
434 | if (!buf->area) | |
435 | continue; | |
436 | ||
437 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
438 | buf->area, buf->addr); | |
439 | buf->area = NULL; | |
440 | } | |
441 | } | |
442 | ||
443 | struct snd_soc_platform imx_soc_platform = { | |
444 | .name = "imx-audio", | |
445 | }; | |
446 | EXPORT_SYMBOL_GPL(imx_soc_platform); | |
447 | ||
448 | static struct snd_soc_dai imx_ac97_dai = { | |
449 | .name = "AC97", | |
450 | .ac97_control = 1, | |
451 | .playback = { | |
452 | .stream_name = "AC97 Playback", | |
453 | .channels_min = 2, | |
454 | .channels_max = 2, | |
455 | .rates = SNDRV_PCM_RATE_48000, | |
456 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
457 | }, | |
458 | .capture = { | |
459 | .stream_name = "AC97 Capture", | |
460 | .channels_min = 2, | |
461 | .channels_max = 2, | |
462 | .rates = SNDRV_PCM_RATE_48000, | |
463 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
464 | }, | |
465 | .ops = &imx_ssi_pcm_dai_ops, | |
466 | }; | |
467 | ||
468 | static void setup_channel_to_ac97(struct imx_ssi *imx_ssi) | |
469 | { | |
470 | void __iomem *base = imx_ssi->base; | |
471 | ||
472 | writel(0x0, base + SSI_SCR); | |
473 | writel(0x0, base + SSI_STCR); | |
474 | writel(0x0, base + SSI_SRCR); | |
475 | ||
476 | writel(SSI_SCR_SYN | SSI_SCR_NET, base + SSI_SCR); | |
477 | ||
478 | writel(SSI_SFCSR_RFWM0(8) | | |
479 | SSI_SFCSR_TFWM0(8) | | |
480 | SSI_SFCSR_RFWM1(8) | | |
481 | SSI_SFCSR_TFWM1(8), base + SSI_SFCSR); | |
482 | ||
483 | writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_STCCR); | |
484 | writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_SRCCR); | |
485 | ||
486 | writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN, base + SSI_SCR); | |
487 | writel(SSI_SOR_WAIT(3), base + SSI_SOR); | |
488 | ||
489 | writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN | | |
490 | SSI_SCR_TE | SSI_SCR_RE, | |
491 | base + SSI_SCR); | |
492 | ||
493 | writel(SSI_SACNT_DEFAULT, base + SSI_SACNT); | |
494 | writel(0xff, base + SSI_SACCDIS); | |
495 | writel(0x300, base + SSI_SACCEN); | |
496 | } | |
497 | ||
498 | static struct imx_ssi *ac97_ssi; | |
499 | ||
500 | static void imx_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg, | |
501 | unsigned short val) | |
502 | { | |
503 | struct imx_ssi *imx_ssi = ac97_ssi; | |
504 | void __iomem *base = imx_ssi->base; | |
505 | unsigned int lreg; | |
506 | unsigned int lval; | |
507 | ||
508 | if (reg > 0x7f) | |
509 | return; | |
510 | ||
511 | pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val); | |
512 | ||
513 | lreg = reg << 12; | |
514 | writel(lreg, base + SSI_SACADD); | |
515 | ||
516 | lval = val << 4; | |
517 | writel(lval , base + SSI_SACDAT); | |
518 | ||
519 | writel(SSI_SACNT_DEFAULT | SSI_SACNT_WR, base + SSI_SACNT); | |
520 | udelay(100); | |
521 | } | |
522 | ||
523 | static unsigned short imx_ssi_ac97_read(struct snd_ac97 *ac97, | |
524 | unsigned short reg) | |
525 | { | |
526 | struct imx_ssi *imx_ssi = ac97_ssi; | |
527 | void __iomem *base = imx_ssi->base; | |
528 | ||
529 | unsigned short val = -1; | |
530 | unsigned int lreg; | |
531 | ||
532 | lreg = (reg & 0x7f) << 12 ; | |
533 | writel(lreg, base + SSI_SACADD); | |
534 | writel(SSI_SACNT_DEFAULT | SSI_SACNT_RD, base + SSI_SACNT); | |
535 | ||
536 | udelay(100); | |
537 | ||
538 | val = (readl(base + SSI_SACDAT) >> 4) & 0xffff; | |
539 | ||
540 | pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val); | |
541 | ||
542 | return val; | |
543 | } | |
544 | ||
545 | static void imx_ssi_ac97_reset(struct snd_ac97 *ac97) | |
546 | { | |
547 | struct imx_ssi *imx_ssi = ac97_ssi; | |
548 | ||
549 | if (imx_ssi->ac97_reset) | |
550 | imx_ssi->ac97_reset(ac97); | |
551 | } | |
552 | ||
553 | static void imx_ssi_ac97_warm_reset(struct snd_ac97 *ac97) | |
554 | { | |
555 | struct imx_ssi *imx_ssi = ac97_ssi; | |
556 | ||
557 | if (imx_ssi->ac97_warm_reset) | |
558 | imx_ssi->ac97_warm_reset(ac97); | |
559 | } | |
560 | ||
561 | struct snd_ac97_bus_ops soc_ac97_ops = { | |
562 | .read = imx_ssi_ac97_read, | |
563 | .write = imx_ssi_ac97_write, | |
564 | .reset = imx_ssi_ac97_reset, | |
565 | .warm_reset = imx_ssi_ac97_warm_reset | |
566 | }; | |
567 | EXPORT_SYMBOL_GPL(soc_ac97_ops); | |
568 | ||
48dbc419 | 569 | struct snd_soc_dai imx_ssi_pcm_dai[2]; |
8380222e SH |
570 | EXPORT_SYMBOL_GPL(imx_ssi_pcm_dai); |
571 | ||
572 | static int imx_ssi_probe(struct platform_device *pdev) | |
573 | { | |
574 | struct resource *res; | |
575 | struct imx_ssi *ssi; | |
576 | struct imx_ssi_platform_data *pdata = pdev->dev.platform_data; | |
577 | struct snd_soc_platform *platform; | |
578 | int ret = 0; | |
579 | unsigned int val; | |
48dbc419 MB |
580 | struct snd_soc_dai *dai = &imx_ssi_pcm_dai[pdev->id]; |
581 | ||
582 | if (dai->id >= ARRAY_SIZE(imx_ssi_pcm_dai)) | |
583 | return -EINVAL; | |
8380222e SH |
584 | |
585 | ssi = kzalloc(sizeof(*ssi), GFP_KERNEL); | |
586 | if (!ssi) | |
587 | return -ENOMEM; | |
588 | ||
589 | if (pdata) { | |
590 | ssi->ac97_reset = pdata->ac97_reset; | |
591 | ssi->ac97_warm_reset = pdata->ac97_warm_reset; | |
592 | ssi->flags = pdata->flags; | |
593 | } | |
594 | ||
8380222e SH |
595 | ssi->irq = platform_get_irq(pdev, 0); |
596 | ||
597 | ssi->clk = clk_get(&pdev->dev, NULL); | |
598 | if (IS_ERR(ssi->clk)) { | |
599 | ret = PTR_ERR(ssi->clk); | |
600 | dev_err(&pdev->dev, "Cannot get the clock: %d\n", | |
601 | ret); | |
602 | goto failed_clk; | |
603 | } | |
604 | clk_enable(ssi->clk); | |
605 | ||
606 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
607 | if (!res) { | |
608 | ret = -ENODEV; | |
609 | goto failed_get_resource; | |
610 | } | |
611 | ||
612 | if (!request_mem_region(res->start, resource_size(res), DRV_NAME)) { | |
613 | dev_err(&pdev->dev, "request_mem_region failed\n"); | |
614 | ret = -EBUSY; | |
615 | goto failed_get_resource; | |
616 | } | |
617 | ||
618 | ssi->base = ioremap(res->start, resource_size(res)); | |
619 | if (!ssi->base) { | |
620 | dev_err(&pdev->dev, "ioremap failed\n"); | |
621 | ret = -ENODEV; | |
622 | goto failed_ioremap; | |
623 | } | |
624 | ||
625 | if (ssi->flags & IMX_SSI_USE_AC97) { | |
626 | if (ac97_ssi) { | |
627 | ret = -EBUSY; | |
628 | goto failed_ac97; | |
629 | } | |
630 | ac97_ssi = ssi; | |
631 | setup_channel_to_ac97(ssi); | |
48dbc419 | 632 | memcpy(dai, &imx_ac97_dai, sizeof(imx_ac97_dai)); |
8380222e | 633 | } else |
48dbc419 | 634 | memcpy(dai, &imx_ssi_dai, sizeof(imx_ssi_dai)); |
8380222e SH |
635 | |
636 | writel(0x0, ssi->base + SSI_SIER); | |
637 | ||
638 | ssi->dma_params_rx.dma_addr = res->start + SSI_SRX0; | |
639 | ssi->dma_params_tx.dma_addr = res->start + SSI_STX0; | |
640 | ||
641 | res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx0"); | |
642 | if (res) | |
643 | ssi->dma_params_tx.dma = res->start; | |
644 | ||
645 | res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx0"); | |
646 | if (res) | |
647 | ssi->dma_params_rx.dma = res->start; | |
648 | ||
48dbc419 MB |
649 | dai->id = pdev->id; |
650 | dai->dev = &pdev->dev; | |
651 | dai->name = kasprintf(GFP_KERNEL, "imx-ssi.%d", pdev->id); | |
652 | dai->private_data = ssi; | |
8380222e SH |
653 | |
654 | if ((cpu_is_mx27() || cpu_is_mx21()) && | |
655 | !(ssi->flags & IMX_SSI_USE_AC97)) { | |
656 | ssi->flags |= IMX_SSI_DMA; | |
657 | platform = imx_ssi_dma_mx2_init(pdev, ssi); | |
658 | } else | |
659 | platform = imx_ssi_fiq_init(pdev, ssi); | |
660 | ||
661 | imx_soc_platform.pcm_ops = platform->pcm_ops; | |
662 | imx_soc_platform.pcm_new = platform->pcm_new; | |
663 | imx_soc_platform.pcm_free = platform->pcm_free; | |
664 | ||
665 | val = SSI_SFCSR_TFWM0(ssi->dma_params_tx.burstsize) | | |
666 | SSI_SFCSR_RFWM0(ssi->dma_params_rx.burstsize); | |
667 | writel(val, ssi->base + SSI_SFCSR); | |
668 | ||
48dbc419 | 669 | ret = snd_soc_register_dai(dai); |
8380222e SH |
670 | if (ret) { |
671 | dev_err(&pdev->dev, "register DAI failed\n"); | |
672 | goto failed_register; | |
673 | } | |
674 | ||
675 | platform_set_drvdata(pdev, ssi); | |
676 | ||
677 | return 0; | |
678 | ||
679 | failed_register: | |
680 | failed_ac97: | |
681 | iounmap(ssi->base); | |
682 | failed_ioremap: | |
683 | release_mem_region(res->start, resource_size(res)); | |
684 | failed_get_resource: | |
685 | clk_disable(ssi->clk); | |
686 | clk_put(ssi->clk); | |
687 | failed_clk: | |
688 | kfree(ssi); | |
689 | ||
690 | return ret; | |
691 | } | |
692 | ||
693 | static int __devexit imx_ssi_remove(struct platform_device *pdev) | |
694 | { | |
695 | struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
696 | struct imx_ssi *ssi = platform_get_drvdata(pdev); | |
48dbc419 | 697 | struct snd_soc_dai *dai = &imx_ssi_pcm_dai[pdev->id]; |
8380222e | 698 | |
48dbc419 | 699 | snd_soc_unregister_dai(dai); |
8380222e SH |
700 | |
701 | if (ssi->flags & IMX_SSI_USE_AC97) | |
702 | ac97_ssi = NULL; | |
703 | ||
704 | if (!(ssi->flags & IMX_SSI_DMA)) | |
705 | imx_ssi_fiq_exit(pdev, ssi); | |
706 | ||
707 | iounmap(ssi->base); | |
708 | release_mem_region(res->start, resource_size(res)); | |
709 | clk_disable(ssi->clk); | |
710 | clk_put(ssi->clk); | |
711 | kfree(ssi); | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
716 | static struct platform_driver imx_ssi_driver = { | |
717 | .probe = imx_ssi_probe, | |
718 | .remove = __devexit_p(imx_ssi_remove), | |
719 | ||
720 | .driver = { | |
721 | .name = DRV_NAME, | |
722 | .owner = THIS_MODULE, | |
723 | }, | |
724 | }; | |
725 | ||
726 | static int __init imx_ssi_init(void) | |
727 | { | |
728 | int ret; | |
729 | ||
730 | ret = snd_soc_register_platform(&imx_soc_platform); | |
731 | if (ret) { | |
732 | pr_err("failed to register soc platform: %d\n", ret); | |
733 | return ret; | |
734 | } | |
735 | ||
736 | ret = platform_driver_register(&imx_ssi_driver); | |
737 | if (ret) { | |
738 | snd_soc_unregister_platform(&imx_soc_platform); | |
739 | return ret; | |
740 | } | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
745 | static void __exit imx_ssi_exit(void) | |
746 | { | |
747 | platform_driver_unregister(&imx_ssi_driver); | |
748 | snd_soc_unregister_platform(&imx_soc_platform); | |
749 | } | |
750 | ||
751 | module_init(imx_ssi_init); | |
752 | module_exit(imx_ssi_exit); | |
753 | ||
754 | /* Module information */ | |
755 | MODULE_AUTHOR("Sascha Hauer, <s.hauer@pengutronix.de>"); | |
756 | MODULE_DESCRIPTION("i.MX I2S/ac97 SoC Interface"); | |
757 | MODULE_LICENSE("GPL"); | |
758 |