2 * Copyright (C) 2012 Samsung Electronics
3 * R. Chandrasekar <rcsekar@samsung.com>
5 * SPDX-License-Identifier: GPL-2.0+
8 #include <asm/arch/clk.h>
9 #include <asm/arch/pinmux.h>
10 #include <asm/arch/i2s-regs.h>
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)
22 #define TIMEOUT_I2S_TX 100 /* i2s transfer timeout */
25 * Sets the frame size for I2S LR clock
27 * @param i2s_reg i2s regiter address
28 * @param rfs Frame Size
30 static void i2s_set_lr_framesize(struct i2s_reg *i2s_reg, unsigned int rfs)
32 unsigned int mod = readl(&i2s_reg->mod);
34 mod &= ~MOD_RCLK_MASK;
38 mod |= MOD_RCLK_768FS;
41 mod |= MOD_RCLK_512FS;
44 mod |= MOD_RCLK_384FS;
47 mod |= MOD_RCLK_256FS;
51 writel(mod, &i2s_reg->mod);
55 * Sets the i2s transfer control
57 * @param i2s_reg i2s regiter address
58 * @param on 1 enable tx , 0 disable tx transfer
60 static void i2s_txctrl(struct i2s_reg *i2s_reg, int on)
62 unsigned int con = readl(&i2s_reg->con);
63 unsigned int mod = readl(&i2s_reg->mod) & ~MOD_MASK;
67 con &= ~CON_TXCH_PAUSE;
69 con |= CON_TXCH_PAUSE;
73 writel(mod, &i2s_reg->mod);
74 writel(con, &i2s_reg->con);
78 * set the bit clock frame size (in multiples of LRCLK)
80 * @param i2s_reg i2s regiter address
81 * @param bfs bit Frame Size
83 static void i2s_set_bitclk_framesize(struct i2s_reg *i2s_reg, unsigned bfs)
85 unsigned int mod = readl(&i2s_reg->mod);
87 mod &= ~MOD_BCLK_MASK;
100 mod |= MOD_BCLK_16FS;
105 writel(mod, &i2s_reg->mod);
109 * flushes the i2stx fifo
111 * @param i2s_reg i2s regiter address
112 * @param flush Tx fifo flush command (0x00 - do not flush
113 * 0x80 - flush tx fifo)
115 void i2s_fifo(struct i2s_reg *i2s_reg, unsigned int flush)
118 setbits_le32(&i2s_reg->fic, flush);
119 clrbits_le32(&i2s_reg->fic, flush);
123 * Set System Clock direction
125 * @param i2s_reg i2s regiter address
126 * @param dir Clock direction
128 * @return int value 0 for success, -1 in case of error
130 int i2s_set_sysclk_dir(struct i2s_reg *i2s_reg, int dir)
132 unsigned int mod = readl(&i2s_reg->mod);
134 if (dir == SND_SOC_CLOCK_IN)
137 mod &= ~MOD_CDCLKCON;
139 writel(mod, &i2s_reg->mod);
145 * Sets I2S Clcok format
147 * @param fmt i2s clock properties
148 * @param i2s_reg i2s regiter address
150 * @return int value 0 for success, -1 in case of error
152 int i2s_set_fmt(struct i2s_reg *i2s_reg, unsigned int fmt)
154 unsigned int mod = readl(&i2s_reg->mod);
155 unsigned int tmp = 0;
156 unsigned int ret = 0;
158 /* Format is priority */
159 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
160 case SND_SOC_DAIFMT_RIGHT_J:
164 case SND_SOC_DAIFMT_LEFT_J:
168 case SND_SOC_DAIFMT_I2S:
172 debug("%s: Invalid format priority [0x%x]\n", __func__,
173 (fmt & SND_SOC_DAIFMT_FORMAT_MASK));
178 * INV flag is relative to the FORMAT flag - if set it simply
179 * flips the polarity specified by the Standard
181 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
182 case SND_SOC_DAIFMT_NB_NF:
184 case SND_SOC_DAIFMT_NB_IF:
185 if (tmp & MOD_LR_RLOW)
191 debug("%s: Invalid clock ploarity input [0x%x]\n", __func__,
192 (fmt & SND_SOC_DAIFMT_INV_MASK));
196 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
197 case SND_SOC_DAIFMT_CBS_CFS:
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);
204 debug("%s:set i2s clock direction failed\n", __func__);
209 debug("%s: Invalid master selection [0x%x]\n", __func__,
210 (fmt & SND_SOC_DAIFMT_MASTER_MASK));
214 mod &= ~(MOD_SDF_MASK | MOD_LR_RLOW | MOD_SLAVE);
216 writel(mod, &i2s_reg->mod);
222 * Sets the sample width in bits
224 * @param blc samplewidth (size of sample in bits)
225 * @param i2s_reg i2s regiter address
227 * @return int value 0 for success, -1 in case of error
229 int i2s_set_samplesize(struct i2s_reg *i2s_reg, unsigned int blc)
231 unsigned int mod = readl(&i2s_reg->mod);
233 mod &= ~MOD_BLCP_MASK;
234 mod &= ~MOD_BLC_MASK;
238 mod |= MOD_BLCP_8BIT;
242 mod |= MOD_BLCP_16BIT;
243 mod |= MOD_BLC_16BIT;
246 mod |= MOD_BLCP_24BIT;
247 mod |= MOD_BLC_24BIT;
250 debug("%s: Invalid sample size input [0x%x]\n",
254 writel(mod, &i2s_reg->mod);
259 int i2s_transfer_tx_data(struct i2stx_info *pi2s_tx, unsigned int *data,
260 unsigned long data_size)
264 struct i2s_reg *i2s_reg =
265 (struct i2s_reg *)pi2s_tx->base_address;
267 if (data_size < FIFO_LENGTH) {
268 debug("%s : Invalid data size\n", __func__);
269 return -1; /* invalid pcm data size */
272 /* fill the tx buffer before stating the tx transmit */
273 for (i = 0; i < FIFO_LENGTH; i++)
274 writel(*data++, &i2s_reg->txd);
276 data_size -= FIFO_LENGTH;
277 i2s_txctrl(i2s_reg, I2S_TX_ON);
279 while (data_size > 0) {
280 start = get_timer(0);
281 if (!(CON_TXFIFO_FULL & (readl(&i2s_reg->con)))) {
282 writel(*data++, &i2s_reg->txd);
285 if (get_timer(start) > TIMEOUT_I2S_TX) {
286 i2s_txctrl(i2s_reg, I2S_TX_OFF);
287 debug("%s: I2S Transfer Timeout\n", __func__);
292 i2s_txctrl(i2s_reg, I2S_TX_OFF);
297 int i2s_tx_init(struct i2stx_info *pi2s_tx)
300 struct i2s_reg *i2s_reg =
301 (struct i2s_reg *)pi2s_tx->base_address;
302 if (pi2s_tx->id == 0) {
303 /* Initialize GPIO for I2S-0 */
304 exynos_pinmux_config(PERIPH_ID_I2S0, 0);
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);
313 ret = set_epll_clk(pi2s_tx->audio_pll_clk);
315 debug("%s: unsupported i2s-%d bus\n", __func__, pi2s_tx->id);
320 debug("%s: epll clock set rate failed\n", __func__);
324 /* Select Clk Source for Audio 0 or 1 */
325 ret = set_i2s_clk_source(pi2s_tx->id);
327 debug("%s: unsupported clock for i2s-%d\n", __func__,
332 if (pi2s_tx->id == 0) {
333 /*Reset the i2s module */
334 writel(CON_RESET, &i2s_reg->con);
336 writel(MOD_OP_CLK | MOD_RCLKSRC, &i2s_reg->mod);
337 /* set i2s prescaler */
338 writel(PSREN | PSVAL, &i2s_reg->psr);
340 /* Set Prescaler to get MCLK */
341 ret = set_i2s_clk_prescaler(pi2s_tx->audio_pll_clk,
342 (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
346 debug("%s: unsupported prescalar for i2s-%d\n", __func__,
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));
355 i2s_set_lr_framesize(i2s_reg, pi2s_tx->rfs);
356 ret = i2s_set_samplesize(i2s_reg, pi2s_tx->bitspersample);
358 debug("%s:set sample rate failed\n", __func__);
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);
367 debug("%s: failed\n", __func__);