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Merge branch 'for-airlied' of git://people.freedesktop.org/~danvet/drm-intel into...
[deliverable/linux.git] / sound / soc / ux500 / ux500_msp_i2s.c
1 /*
2 * Copyright (C) ST-Ericsson SA 2012
3 *
4 * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
5 * Roger Nilsson <roger.xr.nilsson@stericsson.com>,
6 * Sandeep Kaushik <sandeep.kaushik@st.com>
7 * for ST-Ericsson.
8 *
9 * License terms:
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as published
13 * by the Free Software Foundation.
14 */
15
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/delay.h>
19 #include <linux/slab.h>
20
21 #include <mach/hardware.h>
22 #include <mach/msp.h>
23
24 #include <sound/soc.h>
25
26 #include "ux500_msp_i2s.h"
27
28 /* Protocol desciptors */
29 static const struct msp_protdesc prot_descs[] = {
30 { /* I2S */
31 MSP_SINGLE_PHASE,
32 MSP_SINGLE_PHASE,
33 MSP_PHASE2_START_MODE_IMEDIATE,
34 MSP_PHASE2_START_MODE_IMEDIATE,
35 MSP_BTF_MS_BIT_FIRST,
36 MSP_BTF_MS_BIT_FIRST,
37 MSP_FRAME_LEN_1,
38 MSP_FRAME_LEN_1,
39 MSP_FRAME_LEN_1,
40 MSP_FRAME_LEN_1,
41 MSP_ELEM_LEN_32,
42 MSP_ELEM_LEN_32,
43 MSP_ELEM_LEN_32,
44 MSP_ELEM_LEN_32,
45 MSP_DELAY_1,
46 MSP_DELAY_1,
47 MSP_RISING_EDGE,
48 MSP_FALLING_EDGE,
49 MSP_FSYNC_POL_ACT_LO,
50 MSP_FSYNC_POL_ACT_LO,
51 MSP_SWAP_NONE,
52 MSP_SWAP_NONE,
53 MSP_COMPRESS_MODE_LINEAR,
54 MSP_EXPAND_MODE_LINEAR,
55 MSP_FSYNC_IGNORE,
56 31,
57 15,
58 32,
59 }, { /* PCM */
60 MSP_DUAL_PHASE,
61 MSP_DUAL_PHASE,
62 MSP_PHASE2_START_MODE_FSYNC,
63 MSP_PHASE2_START_MODE_FSYNC,
64 MSP_BTF_MS_BIT_FIRST,
65 MSP_BTF_MS_BIT_FIRST,
66 MSP_FRAME_LEN_1,
67 MSP_FRAME_LEN_1,
68 MSP_FRAME_LEN_1,
69 MSP_FRAME_LEN_1,
70 MSP_ELEM_LEN_16,
71 MSP_ELEM_LEN_16,
72 MSP_ELEM_LEN_16,
73 MSP_ELEM_LEN_16,
74 MSP_DELAY_0,
75 MSP_DELAY_0,
76 MSP_RISING_EDGE,
77 MSP_FALLING_EDGE,
78 MSP_FSYNC_POL_ACT_HI,
79 MSP_FSYNC_POL_ACT_HI,
80 MSP_SWAP_NONE,
81 MSP_SWAP_NONE,
82 MSP_COMPRESS_MODE_LINEAR,
83 MSP_EXPAND_MODE_LINEAR,
84 MSP_FSYNC_IGNORE,
85 255,
86 0,
87 256,
88 }, { /* Companded PCM */
89 MSP_SINGLE_PHASE,
90 MSP_SINGLE_PHASE,
91 MSP_PHASE2_START_MODE_FSYNC,
92 MSP_PHASE2_START_MODE_FSYNC,
93 MSP_BTF_MS_BIT_FIRST,
94 MSP_BTF_MS_BIT_FIRST,
95 MSP_FRAME_LEN_1,
96 MSP_FRAME_LEN_1,
97 MSP_FRAME_LEN_1,
98 MSP_FRAME_LEN_1,
99 MSP_ELEM_LEN_8,
100 MSP_ELEM_LEN_8,
101 MSP_ELEM_LEN_8,
102 MSP_ELEM_LEN_8,
103 MSP_DELAY_0,
104 MSP_DELAY_0,
105 MSP_RISING_EDGE,
106 MSP_RISING_EDGE,
107 MSP_FSYNC_POL_ACT_HI,
108 MSP_FSYNC_POL_ACT_HI,
109 MSP_SWAP_NONE,
110 MSP_SWAP_NONE,
111 MSP_COMPRESS_MODE_LINEAR,
112 MSP_EXPAND_MODE_LINEAR,
113 MSP_FSYNC_IGNORE,
114 255,
115 0,
116 256,
117 },
118 };
119
120 static void set_prot_desc_tx(struct ux500_msp *msp,
121 struct msp_protdesc *protdesc,
122 enum msp_data_size data_size)
123 {
124 u32 temp_reg = 0;
125
126 temp_reg |= MSP_P2_ENABLE_BIT(protdesc->tx_phase_mode);
127 temp_reg |= MSP_P2_START_MODE_BIT(protdesc->tx_phase2_start_mode);
128 temp_reg |= MSP_P1_FRAME_LEN_BITS(protdesc->tx_frame_len_1);
129 temp_reg |= MSP_P2_FRAME_LEN_BITS(protdesc->tx_frame_len_2);
130 if (msp->def_elem_len) {
131 temp_reg |= MSP_P1_ELEM_LEN_BITS(protdesc->tx_elem_len_1);
132 temp_reg |= MSP_P2_ELEM_LEN_BITS(protdesc->tx_elem_len_2);
133 } else {
134 temp_reg |= MSP_P1_ELEM_LEN_BITS(data_size);
135 temp_reg |= MSP_P2_ELEM_LEN_BITS(data_size);
136 }
137 temp_reg |= MSP_DATA_DELAY_BITS(protdesc->tx_data_delay);
138 temp_reg |= MSP_SET_ENDIANNES_BIT(protdesc->tx_byte_order);
139 temp_reg |= MSP_FSYNC_POL(protdesc->tx_fsync_pol);
140 temp_reg |= MSP_DATA_WORD_SWAP(protdesc->tx_half_word_swap);
141 temp_reg |= MSP_SET_COMPANDING_MODE(protdesc->compression_mode);
142 temp_reg |= MSP_SET_FSYNC_IGNORE(protdesc->frame_sync_ignore);
143
144 writel(temp_reg, msp->registers + MSP_TCF);
145 }
146
147 static void set_prot_desc_rx(struct ux500_msp *msp,
148 struct msp_protdesc *protdesc,
149 enum msp_data_size data_size)
150 {
151 u32 temp_reg = 0;
152
153 temp_reg |= MSP_P2_ENABLE_BIT(protdesc->rx_phase_mode);
154 temp_reg |= MSP_P2_START_MODE_BIT(protdesc->rx_phase2_start_mode);
155 temp_reg |= MSP_P1_FRAME_LEN_BITS(protdesc->rx_frame_len_1);
156 temp_reg |= MSP_P2_FRAME_LEN_BITS(protdesc->rx_frame_len_2);
157 if (msp->def_elem_len) {
158 temp_reg |= MSP_P1_ELEM_LEN_BITS(protdesc->rx_elem_len_1);
159 temp_reg |= MSP_P2_ELEM_LEN_BITS(protdesc->rx_elem_len_2);
160 } else {
161 temp_reg |= MSP_P1_ELEM_LEN_BITS(data_size);
162 temp_reg |= MSP_P2_ELEM_LEN_BITS(data_size);
163 }
164
165 temp_reg |= MSP_DATA_DELAY_BITS(protdesc->rx_data_delay);
166 temp_reg |= MSP_SET_ENDIANNES_BIT(protdesc->rx_byte_order);
167 temp_reg |= MSP_FSYNC_POL(protdesc->rx_fsync_pol);
168 temp_reg |= MSP_DATA_WORD_SWAP(protdesc->rx_half_word_swap);
169 temp_reg |= MSP_SET_COMPANDING_MODE(protdesc->expansion_mode);
170 temp_reg |= MSP_SET_FSYNC_IGNORE(protdesc->frame_sync_ignore);
171
172 writel(temp_reg, msp->registers + MSP_RCF);
173 }
174
175 static int configure_protocol(struct ux500_msp *msp,
176 struct ux500_msp_config *config)
177 {
178 struct msp_protdesc *protdesc;
179 enum msp_data_size data_size;
180 u32 temp_reg = 0;
181
182 data_size = config->data_size;
183 msp->def_elem_len = config->def_elem_len;
184 if (config->default_protdesc == 1) {
185 if (config->protocol >= MSP_INVALID_PROTOCOL) {
186 dev_err(msp->dev, "%s: ERROR: Invalid protocol!\n",
187 __func__);
188 return -EINVAL;
189 }
190 protdesc =
191 (struct msp_protdesc *)&prot_descs[config->protocol];
192 } else {
193 protdesc = (struct msp_protdesc *)&config->protdesc;
194 }
195
196 if (data_size < MSP_DATA_BITS_DEFAULT || data_size > MSP_DATA_BITS_32) {
197 dev_err(msp->dev,
198 "%s: ERROR: Invalid data-size requested (data_size = %d)!\n",
199 __func__, data_size);
200 return -EINVAL;
201 }
202
203 if (config->direction & MSP_DIR_TX)
204 set_prot_desc_tx(msp, protdesc, data_size);
205 if (config->direction & MSP_DIR_RX)
206 set_prot_desc_rx(msp, protdesc, data_size);
207
208 /* The code below should not be separated. */
209 temp_reg = readl(msp->registers + MSP_GCR) & ~TX_CLK_POL_RISING;
210 temp_reg |= MSP_TX_CLKPOL_BIT(~protdesc->tx_clk_pol);
211 writel(temp_reg, msp->registers + MSP_GCR);
212 temp_reg = readl(msp->registers + MSP_GCR) & ~RX_CLK_POL_RISING;
213 temp_reg |= MSP_RX_CLKPOL_BIT(protdesc->rx_clk_pol);
214 writel(temp_reg, msp->registers + MSP_GCR);
215
216 return 0;
217 }
218
219 static int setup_bitclk(struct ux500_msp *msp, struct ux500_msp_config *config)
220 {
221 u32 reg_val_GCR;
222 u32 frame_per = 0;
223 u32 sck_div = 0;
224 u32 frame_width = 0;
225 u32 temp_reg = 0;
226 struct msp_protdesc *protdesc = NULL;
227
228 reg_val_GCR = readl(msp->registers + MSP_GCR);
229 writel(reg_val_GCR & ~SRG_ENABLE, msp->registers + MSP_GCR);
230
231 if (config->default_protdesc)
232 protdesc =
233 (struct msp_protdesc *)&prot_descs[config->protocol];
234 else
235 protdesc = (struct msp_protdesc *)&config->protdesc;
236
237 switch (config->protocol) {
238 case MSP_PCM_PROTOCOL:
239 case MSP_PCM_COMPAND_PROTOCOL:
240 frame_width = protdesc->frame_width;
241 sck_div = config->f_inputclk / (config->frame_freq *
242 (protdesc->clocks_per_frame));
243 frame_per = protdesc->frame_period;
244 break;
245 case MSP_I2S_PROTOCOL:
246 frame_width = protdesc->frame_width;
247 sck_div = config->f_inputclk / (config->frame_freq *
248 (protdesc->clocks_per_frame));
249 frame_per = protdesc->frame_period;
250 break;
251 default:
252 dev_err(msp->dev, "%s: ERROR: Unknown protocol (%d)!\n",
253 __func__,
254 config->protocol);
255 return -EINVAL;
256 }
257
258 temp_reg = (sck_div - 1) & SCK_DIV_MASK;
259 temp_reg |= FRAME_WIDTH_BITS(frame_width);
260 temp_reg |= FRAME_PERIOD_BITS(frame_per);
261 writel(temp_reg, msp->registers + MSP_SRG);
262
263 msp->f_bitclk = (config->f_inputclk)/(sck_div + 1);
264
265 /* Enable bit-clock */
266 udelay(100);
267 reg_val_GCR = readl(msp->registers + MSP_GCR);
268 writel(reg_val_GCR | SRG_ENABLE, msp->registers + MSP_GCR);
269 udelay(100);
270
271 return 0;
272 }
273
274 static int configure_multichannel(struct ux500_msp *msp,
275 struct ux500_msp_config *config)
276 {
277 struct msp_protdesc *protdesc;
278 struct msp_multichannel_config *mcfg;
279 u32 reg_val_MCR;
280
281 if (config->default_protdesc == 1) {
282 if (config->protocol >= MSP_INVALID_PROTOCOL) {
283 dev_err(msp->dev,
284 "%s: ERROR: Invalid protocol (%d)!\n",
285 __func__, config->protocol);
286 return -EINVAL;
287 }
288 protdesc = (struct msp_protdesc *)
289 &prot_descs[config->protocol];
290 } else {
291 protdesc = (struct msp_protdesc *)&config->protdesc;
292 }
293
294 mcfg = &config->multichannel_config;
295 if (mcfg->tx_multichannel_enable) {
296 if (protdesc->tx_phase_mode == MSP_SINGLE_PHASE) {
297 reg_val_MCR = readl(msp->registers + MSP_MCR);
298 writel(reg_val_MCR | (mcfg->tx_multichannel_enable ?
299 1 << TMCEN_BIT : 0),
300 msp->registers + MSP_MCR);
301 writel(mcfg->tx_channel_0_enable,
302 msp->registers + MSP_TCE0);
303 writel(mcfg->tx_channel_1_enable,
304 msp->registers + MSP_TCE1);
305 writel(mcfg->tx_channel_2_enable,
306 msp->registers + MSP_TCE2);
307 writel(mcfg->tx_channel_3_enable,
308 msp->registers + MSP_TCE3);
309 } else {
310 dev_err(msp->dev,
311 "%s: ERROR: Only single-phase supported (TX-mode: %d)!\n",
312 __func__, protdesc->tx_phase_mode);
313 return -EINVAL;
314 }
315 }
316 if (mcfg->rx_multichannel_enable) {
317 if (protdesc->rx_phase_mode == MSP_SINGLE_PHASE) {
318 reg_val_MCR = readl(msp->registers + MSP_MCR);
319 writel(reg_val_MCR | (mcfg->rx_multichannel_enable ?
320 1 << RMCEN_BIT : 0),
321 msp->registers + MSP_MCR);
322 writel(mcfg->rx_channel_0_enable,
323 msp->registers + MSP_RCE0);
324 writel(mcfg->rx_channel_1_enable,
325 msp->registers + MSP_RCE1);
326 writel(mcfg->rx_channel_2_enable,
327 msp->registers + MSP_RCE2);
328 writel(mcfg->rx_channel_3_enable,
329 msp->registers + MSP_RCE3);
330 } else {
331 dev_err(msp->dev,
332 "%s: ERROR: Only single-phase supported (RX-mode: %d)!\n",
333 __func__, protdesc->rx_phase_mode);
334 return -EINVAL;
335 }
336 if (mcfg->rx_comparison_enable_mode) {
337 reg_val_MCR = readl(msp->registers + MSP_MCR);
338 writel(reg_val_MCR |
339 (mcfg->rx_comparison_enable_mode << RCMPM_BIT),
340 msp->registers + MSP_MCR);
341
342 writel(mcfg->comparison_mask,
343 msp->registers + MSP_RCM);
344 writel(mcfg->comparison_value,
345 msp->registers + MSP_RCV);
346
347 }
348 }
349
350 return 0;
351 }
352
353 static int enable_msp(struct ux500_msp *msp, struct ux500_msp_config *config)
354 {
355 int status = 0;
356 u32 reg_val_DMACR, reg_val_GCR;
357
358 /* Check msp state whether in RUN or CONFIGURED Mode */
359 if ((msp->msp_state == MSP_STATE_IDLE) && (msp->plat_init)) {
360 status = msp->plat_init();
361 if (status) {
362 dev_err(msp->dev, "%s: ERROR: Failed to init MSP (%d)!\n",
363 __func__, status);
364 return status;
365 }
366 }
367
368 /* Configure msp with protocol dependent settings */
369 configure_protocol(msp, config);
370 setup_bitclk(msp, config);
371 if (config->multichannel_configured == 1) {
372 status = configure_multichannel(msp, config);
373 if (status)
374 dev_warn(msp->dev,
375 "%s: WARN: configure_multichannel failed (%d)!\n",
376 __func__, status);
377 }
378
379 /* Make sure the correct DMA-directions are configured */
380 if ((config->direction & MSP_DIR_RX) && (!msp->dma_cfg_rx)) {
381 dev_err(msp->dev, "%s: ERROR: MSP RX-mode is not configured!",
382 __func__);
383 return -EINVAL;
384 }
385 if ((config->direction == MSP_DIR_TX) && (!msp->dma_cfg_tx)) {
386 dev_err(msp->dev, "%s: ERROR: MSP TX-mode is not configured!",
387 __func__);
388 return -EINVAL;
389 }
390
391 reg_val_DMACR = readl(msp->registers + MSP_DMACR);
392 if (config->direction & MSP_DIR_RX)
393 reg_val_DMACR |= RX_DMA_ENABLE;
394 if (config->direction & MSP_DIR_TX)
395 reg_val_DMACR |= TX_DMA_ENABLE;
396 writel(reg_val_DMACR, msp->registers + MSP_DMACR);
397
398 writel(config->iodelay, msp->registers + MSP_IODLY);
399
400 /* Enable frame generation logic */
401 reg_val_GCR = readl(msp->registers + MSP_GCR);
402 writel(reg_val_GCR | FRAME_GEN_ENABLE, msp->registers + MSP_GCR);
403
404 return status;
405 }
406
407 static void flush_fifo_rx(struct ux500_msp *msp)
408 {
409 u32 reg_val_DR, reg_val_GCR, reg_val_FLR;
410 u32 limit = 32;
411
412 reg_val_GCR = readl(msp->registers + MSP_GCR);
413 writel(reg_val_GCR | RX_ENABLE, msp->registers + MSP_GCR);
414
415 reg_val_FLR = readl(msp->registers + MSP_FLR);
416 while (!(reg_val_FLR & RX_FIFO_EMPTY) && limit--) {
417 reg_val_DR = readl(msp->registers + MSP_DR);
418 reg_val_FLR = readl(msp->registers + MSP_FLR);
419 }
420
421 writel(reg_val_GCR, msp->registers + MSP_GCR);
422 }
423
424 static void flush_fifo_tx(struct ux500_msp *msp)
425 {
426 u32 reg_val_TSTDR, reg_val_GCR, reg_val_FLR;
427 u32 limit = 32;
428
429 reg_val_GCR = readl(msp->registers + MSP_GCR);
430 writel(reg_val_GCR | TX_ENABLE, msp->registers + MSP_GCR);
431 writel(MSP_ITCR_ITEN | MSP_ITCR_TESTFIFO, msp->registers + MSP_ITCR);
432
433 reg_val_FLR = readl(msp->registers + MSP_FLR);
434 while (!(reg_val_FLR & TX_FIFO_EMPTY) && limit--) {
435 reg_val_TSTDR = readl(msp->registers + MSP_TSTDR);
436 reg_val_FLR = readl(msp->registers + MSP_FLR);
437 }
438 writel(0x0, msp->registers + MSP_ITCR);
439 writel(reg_val_GCR, msp->registers + MSP_GCR);
440 }
441
442 int ux500_msp_i2s_open(struct ux500_msp *msp,
443 struct ux500_msp_config *config)
444 {
445 u32 old_reg, new_reg, mask;
446 int res;
447 unsigned int tx_sel, rx_sel, tx_busy, rx_busy;
448
449 if (in_interrupt()) {
450 dev_err(msp->dev,
451 "%s: ERROR: Open called in interrupt context!\n",
452 __func__);
453 return -1;
454 }
455
456 tx_sel = (config->direction & MSP_DIR_TX) > 0;
457 rx_sel = (config->direction & MSP_DIR_RX) > 0;
458 if (!tx_sel && !rx_sel) {
459 dev_err(msp->dev, "%s: Error: No direction selected!\n",
460 __func__);
461 return -EINVAL;
462 }
463
464 tx_busy = (msp->dir_busy & MSP_DIR_TX) > 0;
465 rx_busy = (msp->dir_busy & MSP_DIR_RX) > 0;
466 if (tx_busy && tx_sel) {
467 dev_err(msp->dev, "%s: Error: TX is in use!\n", __func__);
468 return -EBUSY;
469 }
470 if (rx_busy && rx_sel) {
471 dev_err(msp->dev, "%s: Error: RX is in use!\n", __func__);
472 return -EBUSY;
473 }
474
475 msp->dir_busy |= (tx_sel ? MSP_DIR_TX : 0) | (rx_sel ? MSP_DIR_RX : 0);
476
477 /* First do the global config register */
478 mask = RX_CLK_SEL_MASK | TX_CLK_SEL_MASK | RX_FSYNC_MASK |
479 TX_FSYNC_MASK | RX_SYNC_SEL_MASK | TX_SYNC_SEL_MASK |
480 RX_FIFO_ENABLE_MASK | TX_FIFO_ENABLE_MASK | SRG_CLK_SEL_MASK |
481 LOOPBACK_MASK | TX_EXTRA_DELAY_MASK;
482
483 new_reg = (config->tx_clk_sel | config->rx_clk_sel |
484 config->rx_fsync_pol | config->tx_fsync_pol |
485 config->rx_fsync_sel | config->tx_fsync_sel |
486 config->rx_fifo_config | config->tx_fifo_config |
487 config->srg_clk_sel | config->loopback_enable |
488 config->tx_data_enable);
489
490 old_reg = readl(msp->registers + MSP_GCR);
491 old_reg &= ~mask;
492 new_reg |= old_reg;
493 writel(new_reg, msp->registers + MSP_GCR);
494
495 res = enable_msp(msp, config);
496 if (res < 0) {
497 dev_err(msp->dev, "%s: ERROR: enable_msp failed (%d)!\n",
498 __func__, res);
499 return -EBUSY;
500 }
501 if (config->loopback_enable & 0x80)
502 msp->loopback_enable = 1;
503
504 /* Flush FIFOs */
505 flush_fifo_tx(msp);
506 flush_fifo_rx(msp);
507
508 msp->msp_state = MSP_STATE_CONFIGURED;
509 return 0;
510 }
511
512 static void disable_msp_rx(struct ux500_msp *msp)
513 {
514 u32 reg_val_GCR, reg_val_DMACR, reg_val_IMSC;
515
516 reg_val_GCR = readl(msp->registers + MSP_GCR);
517 writel(reg_val_GCR & ~RX_ENABLE, msp->registers + MSP_GCR);
518 reg_val_DMACR = readl(msp->registers + MSP_DMACR);
519 writel(reg_val_DMACR & ~RX_DMA_ENABLE, msp->registers + MSP_DMACR);
520 reg_val_IMSC = readl(msp->registers + MSP_IMSC);
521 writel(reg_val_IMSC &
522 ~(RX_SERVICE_INT | RX_OVERRUN_ERROR_INT),
523 msp->registers + MSP_IMSC);
524
525 msp->dir_busy &= ~MSP_DIR_RX;
526 }
527
528 static void disable_msp_tx(struct ux500_msp *msp)
529 {
530 u32 reg_val_GCR, reg_val_DMACR, reg_val_IMSC;
531
532 reg_val_GCR = readl(msp->registers + MSP_GCR);
533 writel(reg_val_GCR & ~TX_ENABLE, msp->registers + MSP_GCR);
534 reg_val_DMACR = readl(msp->registers + MSP_DMACR);
535 writel(reg_val_DMACR & ~TX_DMA_ENABLE, msp->registers + MSP_DMACR);
536 reg_val_IMSC = readl(msp->registers + MSP_IMSC);
537 writel(reg_val_IMSC &
538 ~(TX_SERVICE_INT | TX_UNDERRUN_ERR_INT),
539 msp->registers + MSP_IMSC);
540
541 msp->dir_busy &= ~MSP_DIR_TX;
542 }
543
544 static int disable_msp(struct ux500_msp *msp, unsigned int dir)
545 {
546 u32 reg_val_GCR;
547 int status = 0;
548 unsigned int disable_tx, disable_rx;
549
550 reg_val_GCR = readl(msp->registers + MSP_GCR);
551 disable_tx = dir & MSP_DIR_TX;
552 disable_rx = dir & MSP_DIR_TX;
553 if (disable_tx && disable_rx) {
554 reg_val_GCR = readl(msp->registers + MSP_GCR);
555 writel(reg_val_GCR | LOOPBACK_MASK,
556 msp->registers + MSP_GCR);
557
558 /* Flush TX-FIFO */
559 flush_fifo_tx(msp);
560
561 /* Disable TX-channel */
562 writel((readl(msp->registers + MSP_GCR) &
563 (~TX_ENABLE)), msp->registers + MSP_GCR);
564
565 /* Flush RX-FIFO */
566 flush_fifo_rx(msp);
567
568 /* Disable Loopback and Receive channel */
569 writel((readl(msp->registers + MSP_GCR) &
570 (~(RX_ENABLE | LOOPBACK_MASK))),
571 msp->registers + MSP_GCR);
572
573 disable_msp_tx(msp);
574 disable_msp_rx(msp);
575 } else if (disable_tx)
576 disable_msp_tx(msp);
577 else if (disable_rx)
578 disable_msp_rx(msp);
579
580 return status;
581 }
582
583 int ux500_msp_i2s_trigger(struct ux500_msp *msp, int cmd, int direction)
584 {
585 u32 reg_val_GCR, enable_bit;
586
587 if (msp->msp_state == MSP_STATE_IDLE) {
588 dev_err(msp->dev, "%s: ERROR: MSP is not configured!\n",
589 __func__);
590 return -EINVAL;
591 }
592
593 switch (cmd) {
594 case SNDRV_PCM_TRIGGER_START:
595 case SNDRV_PCM_TRIGGER_RESUME:
596 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
597 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
598 enable_bit = TX_ENABLE;
599 else
600 enable_bit = RX_ENABLE;
601 reg_val_GCR = readl(msp->registers + MSP_GCR);
602 writel(reg_val_GCR | enable_bit, msp->registers + MSP_GCR);
603 break;
604
605 case SNDRV_PCM_TRIGGER_STOP:
606 case SNDRV_PCM_TRIGGER_SUSPEND:
607 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
608 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
609 disable_msp_tx(msp);
610 else
611 disable_msp_rx(msp);
612 break;
613 default:
614 return -EINVAL;
615 break;
616 }
617
618 return 0;
619 }
620
621 int ux500_msp_i2s_close(struct ux500_msp *msp, unsigned int dir)
622 {
623 int status = 0;
624
625 dev_dbg(msp->dev, "%s: Enter (dir = 0x%01x).\n", __func__, dir);
626
627 status = disable_msp(msp, dir);
628 if (msp->dir_busy == 0) {
629 /* disable sample rate and frame generators */
630 msp->msp_state = MSP_STATE_IDLE;
631 writel((readl(msp->registers + MSP_GCR) &
632 (~(FRAME_GEN_ENABLE | SRG_ENABLE))),
633 msp->registers + MSP_GCR);
634 if (msp->plat_exit)
635 status = msp->plat_exit();
636 if (status)
637 dev_warn(msp->dev,
638 "%s: WARN: ux500_msp_i2s_exit failed (%d)!\n",
639 __func__, status);
640 writel(0, msp->registers + MSP_GCR);
641 writel(0, msp->registers + MSP_TCF);
642 writel(0, msp->registers + MSP_RCF);
643 writel(0, msp->registers + MSP_DMACR);
644 writel(0, msp->registers + MSP_SRG);
645 writel(0, msp->registers + MSP_MCR);
646 writel(0, msp->registers + MSP_RCM);
647 writel(0, msp->registers + MSP_RCV);
648 writel(0, msp->registers + MSP_TCE0);
649 writel(0, msp->registers + MSP_TCE1);
650 writel(0, msp->registers + MSP_TCE2);
651 writel(0, msp->registers + MSP_TCE3);
652 writel(0, msp->registers + MSP_RCE0);
653 writel(0, msp->registers + MSP_RCE1);
654 writel(0, msp->registers + MSP_RCE2);
655 writel(0, msp->registers + MSP_RCE3);
656 }
657
658 return status;
659
660 }
661
662 int ux500_msp_i2s_init_msp(struct platform_device *pdev,
663 struct ux500_msp **msp_p,
664 struct msp_i2s_platform_data *platform_data)
665 {
666 struct resource *res = NULL;
667 struct i2s_controller *i2s_cont;
668 struct ux500_msp *msp;
669
670 dev_dbg(&pdev->dev, "%s: Enter (name: %s, id: %d).\n", __func__,
671 pdev->name, platform_data->id);
672
673 *msp_p = devm_kzalloc(&pdev->dev, sizeof(struct ux500_msp), GFP_KERNEL);
674 msp = *msp_p;
675
676 msp->id = platform_data->id;
677 msp->dev = &pdev->dev;
678 msp->plat_init = platform_data->msp_i2s_init;
679 msp->plat_exit = platform_data->msp_i2s_exit;
680 msp->dma_cfg_rx = platform_data->msp_i2s_dma_rx;
681 msp->dma_cfg_tx = platform_data->msp_i2s_dma_tx;
682
683 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
684 if (res == NULL) {
685 dev_err(&pdev->dev, "%s: ERROR: Unable to get resource!\n",
686 __func__);
687 return -ENOMEM;
688 }
689
690 msp->registers = devm_ioremap(&pdev->dev, res->start,
691 resource_size(res));
692 if (msp->registers == NULL) {
693 dev_err(&pdev->dev, "%s: ERROR: ioremap failed!\n", __func__);
694 return -ENOMEM;
695 }
696
697 msp->msp_state = MSP_STATE_IDLE;
698 msp->loopback_enable = 0;
699
700 /* I2S-controller is allocated and added in I2S controller class. */
701 i2s_cont = devm_kzalloc(&pdev->dev, sizeof(*i2s_cont), GFP_KERNEL);
702 if (!i2s_cont) {
703 dev_err(&pdev->dev,
704 "%s: ERROR: Failed to allocate I2S-controller!\n",
705 __func__);
706 return -ENOMEM;
707 }
708 i2s_cont->dev.parent = &pdev->dev;
709 i2s_cont->data = (void *)msp;
710 i2s_cont->id = (s16)msp->id;
711 snprintf(i2s_cont->name, sizeof(i2s_cont->name), "ux500-msp-i2s.%04x",
712 msp->id);
713 dev_dbg(&pdev->dev, "I2S device-name: '%s'\n", i2s_cont->name);
714 msp->i2s_cont = i2s_cont;
715
716 return 0;
717 }
718
719 void ux500_msp_i2s_cleanup_msp(struct platform_device *pdev,
720 struct ux500_msp *msp)
721 {
722 dev_dbg(msp->dev, "%s: Enter (id = %d).\n", __func__, msp->id);
723
724 device_unregister(&msp->i2s_cont->dev);
725 }
726
727 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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