1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2012 Samsung Electronics
4 * R. Chandrasekar <rcsekar@samsung.com>
5 */
6
7 #include <asm/arch/clk.h>
8 #include <asm/arch/pinmux.h>
9 #include <asm/arch/i2s-regs.h>
10 #include <asm/io.h>
11 #include <common.h>
12 #include <sound.h>
13 #include <i2s.h>
14
15 #define FIC_TX2COUNT(x) (((x) >> 24) & 0xf)
16 #define FIC_TX1COUNT(x) (((x) >> 16) & 0xf)
17 #define FIC_TXCOUNT(x) (((x) >> 8) & 0xf)
18 #define FIC_RXCOUNT(x) (((x) >> 0) & 0xf)
19 #define FICS_TXCOUNT(x) (((x) >> 8) & 0x7f)
20
21 #define TIMEOUT_I2S_TX 100 /* i2s transfer timeout */
22
23 /*
24 * Sets the frame size for I2S LR clock
25 *
26 * @param i2s_reg i2s regiter address
27 * @param rfs Frame Size
28 */
i2s_set_lr_framesize(struct i2s_reg * i2s_reg,unsigned int rfs)29 static void i2s_set_lr_framesize(struct i2s_reg *i2s_reg, unsigned int rfs)
30 {
31 unsigned int mod = readl(&i2s_reg->mod);
32
33 mod &= ~MOD_RCLK_MASK;
34
35 switch (rfs) {
36 case 768:
37 mod |= MOD_RCLK_768FS;
38 break;
39 case 512:
40 mod |= MOD_RCLK_512FS;
41 break;
42 case 384:
43 mod |= MOD_RCLK_384FS;
44 break;
45 default:
46 mod |= MOD_RCLK_256FS;
47 break;
48 }
49
50 writel(mod, &i2s_reg->mod);
51 }
52
53 /*
54 * Sets the i2s transfer control
55 *
56 * @param i2s_reg i2s regiter address
57 * @param on 1 enable tx , 0 disable tx transfer
58 */
i2s_txctrl(struct i2s_reg * i2s_reg,int on)59 static void i2s_txctrl(struct i2s_reg *i2s_reg, int on)
60 {
61 unsigned int con = readl(&i2s_reg->con);
62 unsigned int mod = readl(&i2s_reg->mod) & ~MOD_MASK;
63
64 if (on) {
65 con |= CON_ACTIVE;
66 con &= ~CON_TXCH_PAUSE;
67 } else {
68 con |= CON_TXCH_PAUSE;
69 con &= ~CON_ACTIVE;
70 }
71
72 writel(mod, &i2s_reg->mod);
73 writel(con, &i2s_reg->con);
74 }
75
76 /*
77 * set the bit clock frame size (in multiples of LRCLK)
78 *
79 * @param i2s_reg i2s regiter address
80 * @param bfs bit Frame Size
81 */
i2s_set_bitclk_framesize(struct i2s_reg * i2s_reg,unsigned bfs)82 static void i2s_set_bitclk_framesize(struct i2s_reg *i2s_reg, unsigned bfs)
83 {
84 unsigned int mod = readl(&i2s_reg->mod);
85
86 mod &= ~MOD_BCLK_MASK;
87
88 switch (bfs) {
89 case 48:
90 mod |= MOD_BCLK_48FS;
91 break;
92 case 32:
93 mod |= MOD_BCLK_32FS;
94 break;
95 case 24:
96 mod |= MOD_BCLK_24FS;
97 break;
98 case 16:
99 mod |= MOD_BCLK_16FS;
100 break;
101 default:
102 return;
103 }
104 writel(mod, &i2s_reg->mod);
105 }
106
107 /*
108 * flushes the i2stx fifo
109 *
110 * @param i2s_reg i2s regiter address
111 * @param flush Tx fifo flush command (0x00 - do not flush
112 * 0x80 - flush tx fifo)
113 */
i2s_fifo(struct i2s_reg * i2s_reg,unsigned int flush)114 void i2s_fifo(struct i2s_reg *i2s_reg, unsigned int flush)
115 {
116 /* Flush the FIFO */
117 setbits_le32(&i2s_reg->fic, flush);
118 clrbits_le32(&i2s_reg->fic, flush);
119 }
120
121 /*
122 * Set System Clock direction
123 *
124 * @param i2s_reg i2s regiter address
125 * @param dir Clock direction
126 *
127 * @return int value 0 for success, -1 in case of error
128 */
i2s_set_sysclk_dir(struct i2s_reg * i2s_reg,int dir)129 int i2s_set_sysclk_dir(struct i2s_reg *i2s_reg, int dir)
130 {
131 unsigned int mod = readl(&i2s_reg->mod);
132
133 if (dir == SND_SOC_CLOCK_IN)
134 mod |= MOD_CDCLKCON;
135 else
136 mod &= ~MOD_CDCLKCON;
137
138 writel(mod, &i2s_reg->mod);
139
140 return 0;
141 }
142
143 /*
144 * Sets I2S Clcok format
145 *
146 * @param fmt i2s clock properties
147 * @param i2s_reg i2s regiter address
148 *
149 * @return int value 0 for success, -1 in case of error
150 */
i2s_set_fmt(struct i2s_reg * i2s_reg,unsigned int fmt)151 int i2s_set_fmt(struct i2s_reg *i2s_reg, unsigned int fmt)
152 {
153 unsigned int mod = readl(&i2s_reg->mod);
154 unsigned int tmp = 0;
155 unsigned int ret = 0;
156
157 /* Format is priority */
158 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
159 case SND_SOC_DAIFMT_RIGHT_J:
160 tmp |= MOD_LR_RLOW;
161 tmp |= MOD_SDF_MSB;
162 break;
163 case SND_SOC_DAIFMT_LEFT_J:
164 tmp |= MOD_LR_RLOW;
165 tmp |= MOD_SDF_LSB;
166 break;
167 case SND_SOC_DAIFMT_I2S:
168 tmp |= MOD_SDF_IIS;
169 break;
170 default:
171 debug("%s: Invalid format priority [0x%x]\n", __func__,
172 (fmt & SND_SOC_DAIFMT_FORMAT_MASK));
173 return -1;
174 }
175
176 /*
177 * INV flag is relative to the FORMAT flag - if set it simply
178 * flips the polarity specified by the Standard
179 */
180 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
181 case SND_SOC_DAIFMT_NB_NF:
182 break;
183 case SND_SOC_DAIFMT_NB_IF:
184 if (tmp & MOD_LR_RLOW)
185 tmp &= ~MOD_LR_RLOW;
186 else
187 tmp |= MOD_LR_RLOW;
188 break;
189 default:
190 debug("%s: Invalid clock ploarity input [0x%x]\n", __func__,
191 (fmt & SND_SOC_DAIFMT_INV_MASK));
192 return -1;
193 }
194
195 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
196 case SND_SOC_DAIFMT_CBS_CFS:
197 tmp |= MOD_SLAVE;
198 break;
199 case SND_SOC_DAIFMT_CBM_CFM:
200 /* Set default source clock in Master mode */
201 ret = i2s_set_sysclk_dir(i2s_reg, SND_SOC_CLOCK_OUT);
202 if (ret != 0) {
203 debug("%s:set i2s clock direction failed\n", __func__);
204 return -1;
205 }
206 break;
207 default:
208 debug("%s: Invalid master selection [0x%x]\n", __func__,
209 (fmt & SND_SOC_DAIFMT_MASTER_MASK));
210 return -1;
211 }
212
213 mod &= ~(MOD_SDF_MASK | MOD_LR_RLOW | MOD_SLAVE);
214 mod |= tmp;
215 writel(mod, &i2s_reg->mod);
216
217 return 0;
218 }
219
220 /*
221 * Sets the sample width in bits
222 *
223 * @param blc samplewidth (size of sample in bits)
224 * @param i2s_reg i2s regiter address
225 *
226 * @return int value 0 for success, -1 in case of error
227 */
i2s_set_samplesize(struct i2s_reg * i2s_reg,unsigned int blc)228 int i2s_set_samplesize(struct i2s_reg *i2s_reg, unsigned int blc)
229 {
230 unsigned int mod = readl(&i2s_reg->mod);
231
232 mod &= ~MOD_BLCP_MASK;
233 mod &= ~MOD_BLC_MASK;
234
235 switch (blc) {
236 case 8:
237 mod |= MOD_BLCP_8BIT;
238 mod |= MOD_BLC_8BIT;
239 break;
240 case 16:
241 mod |= MOD_BLCP_16BIT;
242 mod |= MOD_BLC_16BIT;
243 break;
244 case 24:
245 mod |= MOD_BLCP_24BIT;
246 mod |= MOD_BLC_24BIT;
247 break;
248 default:
249 debug("%s: Invalid sample size input [0x%x]\n",
250 __func__, blc);
251 return -1;
252 }
253 writel(mod, &i2s_reg->mod);
254
255 return 0;
256 }
257
i2s_transfer_tx_data(struct i2stx_info * pi2s_tx,unsigned int * data,unsigned long data_size)258 int i2s_transfer_tx_data(struct i2stx_info *pi2s_tx, unsigned int *data,
259 unsigned long data_size)
260 {
261 int i;
262 int start;
263 struct i2s_reg *i2s_reg =
264 (struct i2s_reg *)pi2s_tx->base_address;
265
266 if (data_size < FIFO_LENGTH) {
267 debug("%s : Invalid data size\n", __func__);
268 return -1; /* invalid pcm data size */
269 }
270
271 /* fill the tx buffer before stating the tx transmit */
272 for (i = 0; i < FIFO_LENGTH; i++)
273 writel(*data++, &i2s_reg->txd);
274
275 data_size -= FIFO_LENGTH;
276 i2s_txctrl(i2s_reg, I2S_TX_ON);
277
278 while (data_size > 0) {
279 start = get_timer(0);
280 if (!(CON_TXFIFO_FULL & (readl(&i2s_reg->con)))) {
281 writel(*data++, &i2s_reg->txd);
282 data_size--;
283 } else {
284 if (get_timer(start) > TIMEOUT_I2S_TX) {
285 i2s_txctrl(i2s_reg, I2S_TX_OFF);
286 debug("%s: I2S Transfer Timeout\n", __func__);
287 return -1;
288 }
289 }
290 }
291 i2s_txctrl(i2s_reg, I2S_TX_OFF);
292
293 return 0;
294 }
295
i2s_tx_init(struct i2stx_info * pi2s_tx)296 int i2s_tx_init(struct i2stx_info *pi2s_tx)
297 {
298 int ret;
299 struct i2s_reg *i2s_reg =
300 (struct i2s_reg *)pi2s_tx->base_address;
301 if (pi2s_tx->id == 0) {
302 /* Initialize GPIO for I2S-0 */
303 exynos_pinmux_config(PERIPH_ID_I2S0, 0);
304
305 /* Set EPLL Clock */
306 ret = set_epll_clk(pi2s_tx->samplingrate * pi2s_tx->rfs * 4);
307 } else if (pi2s_tx->id == 1) {
308 /* Initialize GPIO for I2S-1 */
309 exynos_pinmux_config(PERIPH_ID_I2S1, 0);
310
311 /* Set EPLL Clock */
312 ret = set_epll_clk(pi2s_tx->audio_pll_clk);
313 } else {
314 debug("%s: unsupported i2s-%d bus\n", __func__, pi2s_tx->id);
315 return -1;
316 }
317
318 if (ret != 0) {
319 debug("%s: epll clock set rate failed\n", __func__);
320 return -1;
321 }
322
323 /* Select Clk Source for Audio 0 or 1 */
324 ret = set_i2s_clk_source(pi2s_tx->id);
325 if (ret == -1) {
326 debug("%s: unsupported clock for i2s-%d\n", __func__,
327 pi2s_tx->id);
328 return -1;
329 }
330
331 if (pi2s_tx->id == 0) {
332 /*Reset the i2s module */
333 writel(CON_RESET, &i2s_reg->con);
334
335 writel(MOD_OP_CLK | MOD_RCLKSRC, &i2s_reg->mod);
336 /* set i2s prescaler */
337 writel(PSREN | PSVAL, &i2s_reg->psr);
338 } else {
339 /* Set Prescaler to get MCLK */
340 ret = set_i2s_clk_prescaler(pi2s_tx->audio_pll_clk,
341 (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
342 pi2s_tx->id);
343 }
344 if (ret == -1) {
345 debug("%s: unsupported prescalar for i2s-%d\n", __func__,
346 pi2s_tx->id);
347 return -1;
348 }
349
350 /* Configure I2s format */
351 ret = i2s_set_fmt(i2s_reg, (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
352 SND_SOC_DAIFMT_CBM_CFM));
353 if (ret == 0) {
354 i2s_set_lr_framesize(i2s_reg, pi2s_tx->rfs);
355 ret = i2s_set_samplesize(i2s_reg, pi2s_tx->bitspersample);
356 if (ret != 0) {
357 debug("%s:set sample rate failed\n", __func__);
358 return -1;
359 }
360
361 i2s_set_bitclk_framesize(i2s_reg, pi2s_tx->bfs);
362 /* disable i2s transfer flag and flush the fifo */
363 i2s_txctrl(i2s_reg, I2S_TX_OFF);
364 i2s_fifo(i2s_reg, FIC_TXFLUSH);
365 } else {
366 debug("%s: failed\n", __func__);
367 }
368
369 return ret;
370 }
371