1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2012 Samsung Electronics
4 * R. Chandrasekar <rcsekar@samsung.com>
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <i2s.h>
10 #include <sound.h>
11 #include <asm/arch/clk.h>
12 #include <asm/arch/pinmux.h>
13 #include <asm/arch/i2s-regs.h>
14 #include <asm/io.h>
15
16 #define FIC_TX2COUNT(x) (((x) >> 24) & 0xf)
17 #define FIC_TX1COUNT(x) (((x) >> 16) & 0xf)
18 #define FIC_TXCOUNT(x) (((x) >> 8) & 0xf)
19 #define FIC_RXCOUNT(x) (((x) >> 0) & 0xf)
20 #define FICS_TXCOUNT(x) (((x) >> 8) & 0x7f)
21
22 #define TIMEOUT_I2S_TX 100 /* i2s transfer timeout */
23
24 /*
25 * Sets the frame size for I2S LR clock
26 *
27 * @param i2s_reg i2s register address
28 * @param rfs Frame Size
29 */
i2s_set_lr_framesize(struct i2s_reg * i2s_reg,unsigned int rfs)30 static void i2s_set_lr_framesize(struct i2s_reg *i2s_reg, unsigned int rfs)
31 {
32 unsigned int mod = readl(&i2s_reg->mod);
33
34 mod &= ~MOD_RCLK_MASK;
35
36 switch (rfs) {
37 case 768:
38 mod |= MOD_RCLK_768FS;
39 break;
40 case 512:
41 mod |= MOD_RCLK_512FS;
42 break;
43 case 384:
44 mod |= MOD_RCLK_384FS;
45 break;
46 default:
47 mod |= MOD_RCLK_256FS;
48 break;
49 }
50
51 writel(mod, &i2s_reg->mod);
52 }
53
54 /*
55 * Sets the i2s transfer control
56 *
57 * @param i2s_reg i2s register address
58 * @param on 1 enable tx , 0 disable tx transfer
59 */
i2s_txctrl(struct i2s_reg * i2s_reg,int on)60 static void i2s_txctrl(struct i2s_reg *i2s_reg, int on)
61 {
62 unsigned int con = readl(&i2s_reg->con);
63 unsigned int mod = readl(&i2s_reg->mod) & ~MOD_MASK;
64
65 if (on) {
66 con |= CON_ACTIVE;
67 con &= ~CON_TXCH_PAUSE;
68 } else {
69 con |= CON_TXCH_PAUSE;
70 con &= ~CON_ACTIVE;
71 }
72
73 writel(mod, &i2s_reg->mod);
74 writel(con, &i2s_reg->con);
75 }
76
77 /*
78 * set the bit clock frame size (in multiples of LRCLK)
79 *
80 * @param i2s_reg i2s register address
81 * @param bfs bit Frame Size
82 */
i2s_set_bitclk_framesize(struct i2s_reg * i2s_reg,unsigned bfs)83 static void i2s_set_bitclk_framesize(struct i2s_reg *i2s_reg, unsigned bfs)
84 {
85 unsigned int mod = readl(&i2s_reg->mod);
86
87 mod &= ~MOD_BCLK_MASK;
88
89 switch (bfs) {
90 case 48:
91 mod |= MOD_BCLK_48FS;
92 break;
93 case 32:
94 mod |= MOD_BCLK_32FS;
95 break;
96 case 24:
97 mod |= MOD_BCLK_24FS;
98 break;
99 case 16:
100 mod |= MOD_BCLK_16FS;
101 break;
102 default:
103 return;
104 }
105 writel(mod, &i2s_reg->mod);
106 }
107
108 /*
109 * flushes the i2stx fifo
110 *
111 * @param i2s_reg i2s register address
112 * @param flush Tx fifo flush command (0x00 - do not flush
113 * 0x80 - flush tx fifo)
114 */
i2s_fifo(struct i2s_reg * i2s_reg,unsigned int flush)115 static void i2s_fifo(struct i2s_reg *i2s_reg, unsigned int flush)
116 {
117 /* Flush the FIFO */
118 setbits_le32(&i2s_reg->fic, flush);
119 clrbits_le32(&i2s_reg->fic, flush);
120 }
121
122 /*
123 * Set System Clock direction
124 *
125 * @param i2s_reg i2s register address
126 * @param dir Clock direction
127 *
128 * @return int value 0 for success, -1 in case of error
129 */
i2s_set_sysclk_dir(struct i2s_reg * i2s_reg,int dir)130 static int i2s_set_sysclk_dir(struct i2s_reg *i2s_reg, int dir)
131 {
132 unsigned int mod = readl(&i2s_reg->mod);
133
134 if (dir == SND_SOC_CLOCK_IN)
135 mod |= MOD_CDCLKCON;
136 else
137 mod &= ~MOD_CDCLKCON;
138
139 writel(mod, &i2s_reg->mod);
140
141 return 0;
142 }
143
144 /*
145 * Sets I2S Clcok format
146 *
147 * @param fmt i2s clock properties
148 * @param i2s_reg i2s register address
149 *
150 * @return int value 0 for success, -1 in case of error
151 */
i2s_set_fmt(struct i2s_reg * i2s_reg,unsigned int fmt)152 static int i2s_set_fmt(struct i2s_reg *i2s_reg, unsigned int fmt)
153 {
154 unsigned int mod = readl(&i2s_reg->mod);
155 unsigned int tmp = 0;
156 unsigned int ret = 0;
157
158 /* Format is priority */
159 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
160 case SND_SOC_DAIFMT_RIGHT_J:
161 tmp |= MOD_LR_RLOW;
162 tmp |= MOD_SDF_MSB;
163 break;
164 case SND_SOC_DAIFMT_LEFT_J:
165 tmp |= MOD_LR_RLOW;
166 tmp |= MOD_SDF_LSB;
167 break;
168 case SND_SOC_DAIFMT_I2S:
169 tmp |= MOD_SDF_IIS;
170 break;
171 default:
172 debug("%s: Invalid format priority [0x%x]\n", __func__,
173 (fmt & SND_SOC_DAIFMT_FORMAT_MASK));
174 return -ERANGE;
175 }
176
177 /*
178 * INV flag is relative to the FORMAT flag - if set it simply
179 * flips the polarity specified by the Standard
180 */
181 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
182 case SND_SOC_DAIFMT_NB_NF:
183 break;
184 case SND_SOC_DAIFMT_NB_IF:
185 if (tmp & MOD_LR_RLOW)
186 tmp &= ~MOD_LR_RLOW;
187 else
188 tmp |= MOD_LR_RLOW;
189 break;
190 default:
191 debug("%s: Invalid clock ploarity input [0x%x]\n", __func__,
192 (fmt & SND_SOC_DAIFMT_INV_MASK));
193 return -ERANGE;
194 }
195
196 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
197 case SND_SOC_DAIFMT_CBS_CFS:
198 tmp |= MOD_SLAVE;
199 break;
200 case SND_SOC_DAIFMT_CBM_CFM:
201 /* Set default source clock in Master mode */
202 ret = i2s_set_sysclk_dir(i2s_reg, SND_SOC_CLOCK_OUT);
203 if (ret != 0) {
204 debug("%s:set i2s clock direction failed\n", __func__);
205 return ret;
206 }
207 break;
208 default:
209 debug("%s: Invalid master selection [0x%x]\n", __func__,
210 (fmt & SND_SOC_DAIFMT_MASTER_MASK));
211 return -ERANGE;
212 }
213
214 mod &= ~(MOD_SDF_MASK | MOD_LR_RLOW | MOD_SLAVE);
215 mod |= tmp;
216 writel(mod, &i2s_reg->mod);
217
218 return 0;
219 }
220
221 /*
222 * Sets the sample width in bits
223 *
224 * @param blc samplewidth (size of sample in bits)
225 * @param i2s_reg i2s register address
226 *
227 * @return int value 0 for success, -1 in case of error
228 */
i2s_set_samplesize(struct i2s_reg * i2s_reg,unsigned int blc)229 static int i2s_set_samplesize(struct i2s_reg *i2s_reg, unsigned int blc)
230 {
231 unsigned int mod = readl(&i2s_reg->mod);
232
233 mod &= ~MOD_BLCP_MASK;
234 mod &= ~MOD_BLC_MASK;
235
236 switch (blc) {
237 case 8:
238 mod |= MOD_BLCP_8BIT;
239 mod |= MOD_BLC_8BIT;
240 break;
241 case 16:
242 mod |= MOD_BLCP_16BIT;
243 mod |= MOD_BLC_16BIT;
244 break;
245 case 24:
246 mod |= MOD_BLCP_24BIT;
247 mod |= MOD_BLC_24BIT;
248 break;
249 default:
250 debug("%s: Invalid sample size input [0x%x]\n",
251 __func__, blc);
252 return -ERANGE;
253 }
254 writel(mod, &i2s_reg->mod);
255
256 return 0;
257 }
258
i2s_transfer_tx_data(struct i2s_uc_priv * pi2s_tx,void * data,uint data_size)259 int i2s_transfer_tx_data(struct i2s_uc_priv *pi2s_tx, void *data,
260 uint data_size)
261 {
262 struct i2s_reg *i2s_reg = (struct i2s_reg *)pi2s_tx->base_address;
263 u32 *ptr;
264 int i;
265 int start;
266
267 if (data_size < FIFO_LENGTH) {
268 debug("%s : Invalid data size\n", __func__);
269 return -ENODATA; /* invalid pcm data size */
270 }
271
272 /* fill the tx buffer before stating the tx transmit */
273 for (i = 0, ptr = data; i < FIFO_LENGTH; i++)
274 writel(*ptr++, &i2s_reg->txd);
275
276 data_size -= sizeof(*ptr) * FIFO_LENGTH;
277 i2s_txctrl(i2s_reg, I2S_TX_ON);
278
279 while (data_size > 0) {
280 start = get_timer(0);
281 if (!(CON_TXFIFO_FULL & (readl(&i2s_reg->con)))) {
282 writel(*ptr++, &i2s_reg->txd);
283 data_size -= sizeof(*ptr);
284 } else {
285 if (get_timer(start) > TIMEOUT_I2S_TX) {
286 i2s_txctrl(i2s_reg, I2S_TX_OFF);
287 debug("%s: I2S Transfer Timeout\n", __func__);
288 return -ETIMEDOUT;
289 }
290 }
291 }
292 i2s_txctrl(i2s_reg, I2S_TX_OFF);
293
294 return 0;
295 }
296
i2s_tx_init(struct i2s_uc_priv * pi2s_tx)297 static int i2s_tx_init(struct i2s_uc_priv *pi2s_tx)
298 {
299 int ret;
300 struct i2s_reg *i2s_reg = (struct i2s_reg *)pi2s_tx->base_address;
301
302 if (pi2s_tx->id == 0) {
303 /* Initialize GPIO for I2S-0 */
304 exynos_pinmux_config(PERIPH_ID_I2S0, 0);
305
306 /* Set EPLL Clock */
307 ret = set_epll_clk(pi2s_tx->samplingrate * pi2s_tx->rfs * 4);
308 } else if (pi2s_tx->id == 1) {
309 /* Initialize GPIO for I2S-1 */
310 exynos_pinmux_config(PERIPH_ID_I2S1, 0);
311
312 /* Set EPLL Clock */
313 ret = set_epll_clk(pi2s_tx->audio_pll_clk);
314 } else {
315 debug("%s: unsupported i2s-%d bus\n", __func__, pi2s_tx->id);
316 return -ERANGE;
317 }
318
319 if (ret) {
320 debug("%s: epll clock set rate failed\n", __func__);
321 return ret;
322 }
323
324 /* Select Clk Source for Audio 0 or 1 */
325 ret = set_i2s_clk_source(pi2s_tx->id);
326 if (ret) {
327 debug("%s: unsupported clock for i2s-%d\n", __func__,
328 pi2s_tx->id);
329 return ret;
330 }
331
332 if (pi2s_tx->id == 0) {
333 /*Reset the i2s module */
334 writel(CON_RESET, &i2s_reg->con);
335
336 writel(MOD_OP_CLK | MOD_RCLKSRC, &i2s_reg->mod);
337 /* set i2s prescaler */
338 writel(PSREN | PSVAL, &i2s_reg->psr);
339 } else {
340 /* Set Prescaler to get MCLK */
341 ret = set_i2s_clk_prescaler(pi2s_tx->audio_pll_clk,
342 (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
343 pi2s_tx->id);
344 }
345 if (ret) {
346 debug("%s: unsupported prescalar for i2s-%d\n", __func__,
347 pi2s_tx->id);
348 return ret;
349 }
350
351 /* Configure I2s format */
352 ret = i2s_set_fmt(i2s_reg, SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
353 SND_SOC_DAIFMT_CBM_CFM);
354 if (ret == 0) {
355 i2s_set_lr_framesize(i2s_reg, pi2s_tx->rfs);
356 ret = i2s_set_samplesize(i2s_reg, pi2s_tx->bitspersample);
357 if (ret != 0) {
358 debug("%s:set sample rate failed\n", __func__);
359 return ret;
360 }
361
362 i2s_set_bitclk_framesize(i2s_reg, pi2s_tx->bfs);
363 /* disable i2s transfer flag and flush the fifo */
364 i2s_txctrl(i2s_reg, I2S_TX_OFF);
365 i2s_fifo(i2s_reg, FIC_TXFLUSH);
366 } else {
367 debug("%s: failed\n", __func__);
368 }
369
370 return ret;
371 }
372
samsung_i2s_tx_data(struct udevice * dev,void * data,uint data_size)373 static int samsung_i2s_tx_data(struct udevice *dev, void *data, uint data_size)
374 {
375 struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
376
377 return i2s_transfer_tx_data(priv, data, data_size);
378 }
379
samsung_i2s_probe(struct udevice * dev)380 static int samsung_i2s_probe(struct udevice *dev)
381 {
382 struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
383
384 return i2s_tx_init(priv);
385 }
386
samsung_i2s_ofdata_to_platdata(struct udevice * dev)387 static int samsung_i2s_ofdata_to_platdata(struct udevice *dev)
388 {
389 struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
390 ulong base;
391
392 /*
393 * Get the pre-defined sound specific values from FDT.
394 * All of these are expected to be correct otherwise
395 * wrong register values in i2s setup parameters
396 * may result in no sound play.
397 */
398 base = dev_read_addr(dev);
399 if (base == FDT_ADDR_T_NONE) {
400 debug("%s: Missing i2s base\n", __func__);
401 return -EINVAL;
402 }
403 priv->base_address = base;
404
405 if (dev_read_u32u(dev, "samsung,i2s-epll-clock-frequency",
406 &priv->audio_pll_clk))
407 goto err;
408 debug("audio_pll_clk = %d\n", priv->audio_pll_clk);
409 if (dev_read_u32u(dev, "samsung,i2s-sampling-rate",
410 &priv->samplingrate))
411 goto err;
412 debug("samplingrate = %d\n", priv->samplingrate);
413 if (dev_read_u32u(dev, "samsung,i2s-bits-per-sample",
414 &priv->bitspersample))
415 goto err;
416 debug("bitspersample = %d\n", priv->bitspersample);
417 if (dev_read_u32u(dev, "samsung,i2s-channels", &priv->channels))
418 goto err;
419 debug("channels = %d\n", priv->channels);
420 if (dev_read_u32u(dev, "samsung,i2s-lr-clk-framesize", &priv->rfs))
421 goto err;
422 debug("rfs = %d\n", priv->rfs);
423 if (dev_read_u32u(dev, "samsung,i2s-bit-clk-framesize", &priv->bfs))
424 goto err;
425 debug("bfs = %d\n", priv->bfs);
426
427 if (dev_read_u32u(dev, "samsung,i2s-id", &priv->id))
428 goto err;
429 debug("id = %d\n", priv->id);
430
431 return 0;
432
433 err:
434 debug("fail to get sound i2s node properties\n");
435
436 return -EINVAL;
437 }
438
439 static const struct i2s_ops samsung_i2s_ops = {
440 .tx_data = samsung_i2s_tx_data,
441 };
442
443 static const struct udevice_id samsung_i2s_ids[] = {
444 { .compatible = "samsung,s5pv210-i2s" },
445 { }
446 };
447
448 U_BOOT_DRIVER(samsung_i2s) = {
449 .name = "samsung_i2s",
450 .id = UCLASS_I2S,
451 .of_match = samsung_i2s_ids,
452 .probe = samsung_i2s_probe,
453 .ofdata_to_platdata = samsung_i2s_ofdata_to_platdata,
454 .ops = &samsung_i2s_ops,
455 };
456