sound/soc/stm/stm32_i2s.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  STM32 ALSA SoC Digital Audio Interface (I2S) driver.
   4  *
   5  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
   6  * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics.
   7  */
   8
   9 #include <linux/bitfield.h>
  10 #include <linux/clk.h>
  11 #include <linux/clk-provider.h>
  12 #include <linux/delay.h>
  13 #include <linux/module.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/regmap.h>
  18 #include <linux/reset.h>
  19 #include <linux/spinlock.h>
  20
  21 #include <sound/dmaengine_pcm.h>
  22 #include <sound/pcm_params.h>
  23
  24 #define STM32_I2S_CR1_REG       0x0
  25 #define STM32_I2S_CFG1_REG      0x08
  26 #define STM32_I2S_CFG2_REG      0x0C
  27 #define STM32_I2S_IER_REG       0x10
  28 #define STM32_I2S_SR_REG        0x14
  29 #define STM32_I2S_IFCR_REG      0x18
  30 #define STM32_I2S_TXDR_REG      0X20
  31 #define STM32_I2S_RXDR_REG      0x30
  32 #define STM32_I2S_CGFR_REG      0X50
  33 #define STM32_I2S_HWCFGR_REG    0x3F0
  34 #define STM32_I2S_VERR_REG      0x3F4
  35 #define STM32_I2S_IPIDR_REG     0x3F8
  36 #define STM32_I2S_SIDR_REG      0x3FC
  37
  38 /* Bit definition for SPI2S_CR1 register */
  39 #define I2S_CR1_SPE             BIT(0)
  40 #define I2S_CR1_CSTART          BIT(9)
  41 #define I2S_CR1_CSUSP           BIT(10)
  42 #define I2S_CR1_HDDIR           BIT(11)
  43 #define I2S_CR1_SSI             BIT(12)
  44 #define I2S_CR1_CRC33_17        BIT(13)
  45 #define I2S_CR1_RCRCI           BIT(14)
  46 #define I2S_CR1_TCRCI           BIT(15)
  47
  48 /* Bit definition for SPI_CFG2 register */
  49 #define I2S_CFG2_IOSWP_SHIFT    15
  50 #define I2S_CFG2_IOSWP          BIT(I2S_CFG2_IOSWP_SHIFT)
  51 #define I2S_CFG2_LSBFRST        BIT(23)
  52 #define I2S_CFG2_AFCNTR         BIT(31)
  53
  54 /* Bit definition for SPI_CFG1 register */
  55 #define I2S_CFG1_FTHVL_SHIFT    5
  56 #define I2S_CFG1_FTHVL_MASK     GENMASK(8, I2S_CFG1_FTHVL_SHIFT)
  57 #define I2S_CFG1_FTHVL_SET(x)   ((x) << I2S_CFG1_FTHVL_SHIFT)
  58
  59 #define I2S_CFG1_TXDMAEN        BIT(15)
  60 #define I2S_CFG1_RXDMAEN        BIT(14)
  61
  62 /* Bit definition for SPI2S_IER register */
  63 #define I2S_IER_RXPIE           BIT(0)
  64 #define I2S_IER_TXPIE           BIT(1)
  65 #define I2S_IER_DPXPIE          BIT(2)
  66 #define I2S_IER_EOTIE           BIT(3)
  67 #define I2S_IER_TXTFIE          BIT(4)
  68 #define I2S_IER_UDRIE           BIT(5)
  69 #define I2S_IER_OVRIE           BIT(6)
  70 #define I2S_IER_CRCEIE          BIT(7)
  71 #define I2S_IER_TIFREIE         BIT(8)
  72 #define I2S_IER_MODFIE          BIT(9)
  73 #define I2S_IER_TSERFIE         BIT(10)
  74
  75 /* Bit definition for SPI2S_SR register */
  76 #define I2S_SR_RXP              BIT(0)
  77 #define I2S_SR_TXP              BIT(1)
  78 #define I2S_SR_DPXP             BIT(2)
  79 #define I2S_SR_EOT              BIT(3)
  80 #define I2S_SR_TXTF             BIT(4)
  81 #define I2S_SR_UDR              BIT(5)
  82 #define I2S_SR_OVR              BIT(6)
  83 #define I2S_SR_CRCERR           BIT(7)
  84 #define I2S_SR_TIFRE            BIT(8)
  85 #define I2S_SR_MODF             BIT(9)
  86 #define I2S_SR_TSERF            BIT(10)
  87 #define I2S_SR_SUSP             BIT(11)
  88 #define I2S_SR_TXC              BIT(12)
  89 #define I2S_SR_RXPLVL           GENMASK(14, 13)
  90 #define I2S_SR_RXWNE            BIT(15)
  91
  92 #define I2S_SR_MASK             GENMASK(15, 0)
  93
  94 /* Bit definition for SPI_IFCR register */
  95 #define I2S_IFCR_EOTC           BIT(3)
  96 #define I2S_IFCR_TXTFC          BIT(4)
  97 #define I2S_IFCR_UDRC           BIT(5)
  98 #define I2S_IFCR_OVRC           BIT(6)
  99 #define I2S_IFCR_CRCEC          BIT(7)
 100 #define I2S_IFCR_TIFREC         BIT(8)
 101 #define I2S_IFCR_MODFC          BIT(9)
 102 #define I2S_IFCR_TSERFC         BIT(10)
 103 #define I2S_IFCR_SUSPC          BIT(11)
 104
 105 #define I2S_IFCR_MASK           GENMASK(11, 3)
 106
 107 /* Bit definition for SPI_I2SCGFR register */
 108 #define I2S_CGFR_I2SMOD         BIT(0)
 109
 110 #define I2S_CGFR_I2SCFG_SHIFT   1
 111 #define I2S_CGFR_I2SCFG_MASK    GENMASK(3, I2S_CGFR_I2SCFG_SHIFT)
 112 #define I2S_CGFR_I2SCFG_SET(x)  ((x) << I2S_CGFR_I2SCFG_SHIFT)
 113
 114 #define I2S_CGFR_I2SSTD_SHIFT   4
 115 #define I2S_CGFR_I2SSTD_MASK    GENMASK(5, I2S_CGFR_I2SSTD_SHIFT)
 116 #define I2S_CGFR_I2SSTD_SET(x)  ((x) << I2S_CGFR_I2SSTD_SHIFT)
 117
 118 #define I2S_CGFR_PCMSYNC        BIT(7)
 119
 120 #define I2S_CGFR_DATLEN_SHIFT   8
 121 #define I2S_CGFR_DATLEN_MASK    GENMASK(9, I2S_CGFR_DATLEN_SHIFT)
 122 #define I2S_CGFR_DATLEN_SET(x)  ((x) << I2S_CGFR_DATLEN_SHIFT)
 123
 124 #define I2S_CGFR_CHLEN_SHIFT    10
 125 #define I2S_CGFR_CHLEN          BIT(I2S_CGFR_CHLEN_SHIFT)
 126 #define I2S_CGFR_CKPOL          BIT(11)
 127 #define I2S_CGFR_FIXCH          BIT(12)
 128 #define I2S_CGFR_WSINV          BIT(13)
 129 #define I2S_CGFR_DATFMT         BIT(14)
 130
 131 #define I2S_CGFR_I2SDIV_SHIFT   16
 132 #define I2S_CGFR_I2SDIV_BIT_H   23
 133 #define I2S_CGFR_I2SDIV_MASK    GENMASK(I2S_CGFR_I2SDIV_BIT_H,\
 134                                 I2S_CGFR_I2SDIV_SHIFT)
 135 #define I2S_CGFR_I2SDIV_SET(x)  ((x) << I2S_CGFR_I2SDIV_SHIFT)
 136 #define I2S_CGFR_I2SDIV_MAX     ((1 << (I2S_CGFR_I2SDIV_BIT_H -\
 137                                 I2S_CGFR_I2SDIV_SHIFT)) - 1)
 138
 139 #define I2S_CGFR_ODD_SHIFT      24
 140 #define I2S_CGFR_ODD            BIT(I2S_CGFR_ODD_SHIFT)
 141 #define I2S_CGFR_MCKOE          BIT(25)
 142
 143 /* Registers below apply to I2S version 1.1 and more */
 144
 145 /* Bit definition for SPI_HWCFGR register */
 146 #define I2S_HWCFGR_I2S_SUPPORT_MASK     GENMASK(15, 12)
 147
 148 /* Bit definition for SPI_VERR register */
 149 #define I2S_VERR_MIN_MASK       GENMASK(3, 0)
 150 #define I2S_VERR_MAJ_MASK       GENMASK(7, 4)
 151
 152 /* Bit definition for SPI_IPIDR register */
 153 #define I2S_IPIDR_ID_MASK       GENMASK(31, 0)
 154
 155 /* Bit definition for SPI_SIDR register */
 156 #define I2S_SIDR_ID_MASK        GENMASK(31, 0)
 157
 158 #define I2S_IPIDR_NUMBER        0x00130022
 159
 160 enum i2s_master_mode {
 161         I2S_MS_NOT_SET,
 162         I2S_MS_MASTER,
 163         I2S_MS_SLAVE,
 164 };
 165
 166 enum i2s_mode {
 167         I2S_I2SMOD_TX_SLAVE,
 168         I2S_I2SMOD_RX_SLAVE,
 169         I2S_I2SMOD_TX_MASTER,
 170         I2S_I2SMOD_RX_MASTER,
 171         I2S_I2SMOD_FD_SLAVE,
 172         I2S_I2SMOD_FD_MASTER,
 173 };
 174
 175 enum i2s_fifo_th {
 176         I2S_FIFO_TH_NONE,
 177         I2S_FIFO_TH_ONE_QUARTER,
 178         I2S_FIFO_TH_HALF,
 179         I2S_FIFO_TH_THREE_QUARTER,
 180         I2S_FIFO_TH_FULL,
 181 };
 182
 183 enum i2s_std {
 184         I2S_STD_I2S,
 185         I2S_STD_LEFT_J,
 186         I2S_STD_RIGHT_J,
 187         I2S_STD_DSP,
 188 };
 189
 190 enum i2s_datlen {
 191         I2S_I2SMOD_DATLEN_16,
 192         I2S_I2SMOD_DATLEN_24,
 193         I2S_I2SMOD_DATLEN_32,
 194 };
 195
 196 #define STM32_I2S_FIFO_SIZE             16
 197
 198 #define STM32_I2S_IS_MASTER(x)          ((x)->ms_flg == I2S_MS_MASTER)
 199 #define STM32_I2S_IS_SLAVE(x)           ((x)->ms_flg == I2S_MS_SLAVE)
 200
 201 #define STM32_I2S_NAME_LEN              32
 202 #define STM32_I2S_RATE_11K              11025
 203
 204 /**
 205  * struct stm32_i2s_data - private data of I2S
 206  * @regmap_conf: I2S register map configuration pointer
 207  * @regmap: I2S register map pointer
 208  * @pdev: device data pointer
 209  * @dai_drv: DAI driver pointer
 210  * @dma_data_tx: dma configuration data for tx channel
 211  * @dma_data_rx: dma configuration data for tx channel
 212  * @substream: PCM substream data pointer
 213  * @i2sclk: kernel clock feeding the I2S clock generator
 214  * @i2smclk: master clock from I2S mclk provider
 215  * @pclk: peripheral clock driving bus interface
 216  * @x8kclk: I2S parent clock for sampling frequencies multiple of 8kHz
 217  * @x11kclk: I2S parent clock for sampling frequencies multiple of 11kHz
 218  * @base:  mmio register base virtual address
 219  * @phys_addr: I2S registers physical base address
 220  * @lock_fd: lock to manage race conditions in full duplex mode
 221  * @irq_lock: prevent race condition with IRQ
 222  * @mclk_rate: master clock frequency (Hz)
 223  * @fmt: DAI protocol
 224  * @divider: prescaler division ratio
 225  * @div: prescaler div field
 226  * @odd: prescaler odd field
 227  * @refcount: keep count of opened streams on I2S
 228  * @ms_flg: master mode flag.
 229  */
 230 struct stm32_i2s_data {
 231         const struct regmap_config *regmap_conf;
 232         struct regmap *regmap;
 233         struct platform_device *pdev;
 234         struct snd_soc_dai_driver *dai_drv;
 235         struct snd_dmaengine_dai_dma_data dma_data_tx;
 236         struct snd_dmaengine_dai_dma_data dma_data_rx;
 237         struct snd_pcm_substream *substream;
 238         struct clk *i2sclk;
 239         struct clk *i2smclk;
 240         struct clk *pclk;
 241         struct clk *x8kclk;
 242         struct clk *x11kclk;
 243         void __iomem *base;
 244         dma_addr_t phys_addr;
 245         spinlock_t lock_fd; /* Manage race conditions for full duplex */
 246         spinlock_t irq_lock; /* used to prevent race condition with IRQ */
 247         unsigned int mclk_rate;
 248         unsigned int fmt;
 249         unsigned int divider;
 250         unsigned int div;
 251         bool odd;
 252         int refcount;
 253         int ms_flg;
 254 };
 255
 256 struct stm32_i2smclk_data {
 257         struct clk_hw hw;
 258         unsigned long freq;
 259         struct stm32_i2s_data *i2s_data;
 260 };
 261
 262 #define to_mclk_data(_hw) container_of(_hw, struct stm32_i2smclk_data, hw)
 263
 264 static int stm32_i2s_calc_clk_div(struct stm32_i2s_data *i2s,
 265                                   unsigned long input_rate,
 266                                   unsigned long output_rate)
 267 {
 268         unsigned int ratio, div, divider = 1;
 269         bool odd;
 270
 271         ratio = DIV_ROUND_CLOSEST(input_rate, output_rate);
 272
 273         /* Check the parity of the divider */
 274         odd = ratio & 0x1;
 275
 276         /* Compute the div prescaler */
 277         div = ratio >> 1;
 278
 279         /* If div is 0 actual divider is 1 */
 280         if (div) {
 281                 divider = ((2 * div) + odd);
 282                 dev_dbg(&i2s->pdev->dev, "Divider: 2*%d(div)+%d(odd) = %d\n",
 283                         div, odd, divider);
 284         }
 285
 286         /* Division by three is not allowed by I2S prescaler */
 287         if ((div == 1 && odd) || div > I2S_CGFR_I2SDIV_MAX) {
 288                 dev_err(&i2s->pdev->dev, "Wrong divider setting\n");
 289                 return -EINVAL;
 290         }
 291
 292         if (input_rate % divider)
 293                 dev_dbg(&i2s->pdev->dev,
 294                         "Rate not accurate. requested (%ld), actual (%ld)\n",
 295                         output_rate, input_rate / divider);
 296
 297         i2s->div = div;
 298         i2s->odd = odd;
 299         i2s->divider = divider;
 300
 301         return 0;
 302 }
 303
 304 static int stm32_i2s_set_clk_div(struct stm32_i2s_data *i2s)
 305 {
 306         u32 cgfr, cgfr_mask;
 307
 308         cgfr = I2S_CGFR_I2SDIV_SET(i2s->div) | (i2s->odd << I2S_CGFR_ODD_SHIFT);
 309         cgfr_mask = I2S_CGFR_I2SDIV_MASK | I2S_CGFR_ODD;
 310
 311         return regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
 312                                   cgfr_mask, cgfr);
 313 }
 314
 315 static int stm32_i2s_set_parent_clock(struct stm32_i2s_data *i2s,
 316                                       unsigned int rate)
 317 {
 318         struct platform_device *pdev = i2s->pdev;
 319         struct clk *parent_clk;
 320         int ret;
 321
 322         if (!(rate % STM32_I2S_RATE_11K))
 323                 parent_clk = i2s->x11kclk;
 324         else
 325                 parent_clk = i2s->x8kclk;
 326
 327         ret = clk_set_parent(i2s->i2sclk, parent_clk);
 328         if (ret)
 329                 dev_err(&pdev->dev,
 330                         "Error %d setting i2sclk parent clock\n", ret);
 331
 332         return ret;
 333 }
 334
 335 static long stm32_i2smclk_round_rate(struct clk_hw *hw, unsigned long rate,
 336                                      unsigned long *prate)
 337 {
 338         struct stm32_i2smclk_data *mclk = to_mclk_data(hw);
 339         struct stm32_i2s_data *i2s = mclk->i2s_data;
 340         int ret;
 341
 342         ret = stm32_i2s_calc_clk_div(i2s, *prate, rate);
 343         if (ret)
 344                 return ret;
 345
 346         mclk->freq = *prate / i2s->divider;
 347
 348         return mclk->freq;
 349 }
 350
 351 static unsigned long stm32_i2smclk_recalc_rate(struct clk_hw *hw,
 352                                                unsigned long parent_rate)
 353 {
 354         struct stm32_i2smclk_data *mclk = to_mclk_data(hw);
 355
 356         return mclk->freq;
 357 }
 358
 359 static int stm32_i2smclk_set_rate(struct clk_hw *hw, unsigned long rate,
 360                                   unsigned long parent_rate)
 361 {
 362         struct stm32_i2smclk_data *mclk = to_mclk_data(hw);
 363         struct stm32_i2s_data *i2s = mclk->i2s_data;
 364         int ret;
 365
 366         ret = stm32_i2s_calc_clk_div(i2s, parent_rate, rate);
 367         if (ret)
 368                 return ret;
 369
 370         ret = stm32_i2s_set_clk_div(i2s);
 371         if (ret)
 372                 return ret;
 373
 374         mclk->freq = rate;
 375
 376         return 0;
 377 }
 378
 379 static int stm32_i2smclk_enable(struct clk_hw *hw)
 380 {
 381         struct stm32_i2smclk_data *mclk = to_mclk_data(hw);
 382         struct stm32_i2s_data *i2s = mclk->i2s_data;
 383
 384         dev_dbg(&i2s->pdev->dev, "Enable master clock\n");
 385
 386         return regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
 387                                     I2S_CGFR_MCKOE, I2S_CGFR_MCKOE);
 388 }
 389
 390 static void stm32_i2smclk_disable(struct clk_hw *hw)
 391 {
 392         struct stm32_i2smclk_data *mclk = to_mclk_data(hw);
 393         struct stm32_i2s_data *i2s = mclk->i2s_data;
 394
 395         dev_dbg(&i2s->pdev->dev, "Disable master clock\n");
 396
 397         regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG, I2S_CGFR_MCKOE, 0);
 398 }
 399
 400 static const struct clk_ops mclk_ops = {
 401         .enable = stm32_i2smclk_enable,
 402         .disable = stm32_i2smclk_disable,
 403         .recalc_rate = stm32_i2smclk_recalc_rate,
 404         .round_rate = stm32_i2smclk_round_rate,
 405         .set_rate = stm32_i2smclk_set_rate,
 406 };
 407
 408 static int stm32_i2s_add_mclk_provider(struct stm32_i2s_data *i2s)
 409 {
 410         struct clk_hw *hw;
 411         struct stm32_i2smclk_data *mclk;
 412         struct device *dev = &i2s->pdev->dev;
 413         const char *pname = __clk_get_name(i2s->i2sclk);
 414         char *mclk_name, *p, *s = (char *)pname;
 415         int ret, i = 0;
 416
 417         mclk = devm_kzalloc(dev, sizeof(*mclk), GFP_KERNEL);
 418         if (!mclk)
 419                 return -ENOMEM;
 420
 421         mclk_name = devm_kcalloc(dev, sizeof(char),
 422                                  STM32_I2S_NAME_LEN, GFP_KERNEL);
 423         if (!mclk_name)
 424                 return -ENOMEM;
 425
 426         /*
 427          * Forge mclk clock name from parent clock name and suffix.
 428          * String after "_" char is stripped in parent name.
 429          */
 430         p = mclk_name;
 431         while (*s && *s != '_' && (i < (STM32_I2S_NAME_LEN - 7))) {
 432                 *p++ = *s++;
 433                 i++;
 434         }
 435         strcat(p, "_mclk");
 436
 437         mclk->hw.init = CLK_HW_INIT(mclk_name, pname, &mclk_ops, 0);
 438         mclk->i2s_data = i2s;
 439         hw = &mclk->hw;
 440
 441         dev_dbg(dev, "Register master clock %s\n", mclk_name);
 442         ret = devm_clk_hw_register(&i2s->pdev->dev, hw);
 443         if (ret) {
 444                 dev_err(dev, "mclk register fails with error %d\n", ret);
 445                 return ret;
 446         }
 447         i2s->i2smclk = hw->clk;
 448
 449         /* register mclk provider */
 450         return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw);
 451 }
 452
 453 static irqreturn_t stm32_i2s_isr(int irq, void *devid)
 454 {
 455         struct stm32_i2s_data *i2s = (struct stm32_i2s_data *)devid;
 456         struct platform_device *pdev = i2s->pdev;
 457         u32 sr, ier;
 458         unsigned long flags;
 459         int err = 0;
 460
 461         regmap_read(i2s->regmap, STM32_I2S_SR_REG, &sr);
 462         regmap_read(i2s->regmap, STM32_I2S_IER_REG, &ier);
 463
 464         flags = sr & ier;
 465         if (!flags) {
 466                 dev_dbg(&pdev->dev, "Spurious IRQ sr=0x%08x, ier=0x%08x\n",
 467                         sr, ier);
 468                 return IRQ_NONE;
 469         }
 470
 471         regmap_write_bits(i2s->regmap, STM32_I2S_IFCR_REG,
 472                           I2S_IFCR_MASK, flags);
 473
 474         if (flags & I2S_SR_OVR) {
 475                 dev_dbg(&pdev->dev, "Overrun\n");
 476                 err = 1;
 477         }
 478
 479         if (flags & I2S_SR_UDR) {
 480                 dev_dbg(&pdev->dev, "Underrun\n");
 481                 err = 1;
 482         }
 483
 484         if (flags & I2S_SR_TIFRE)
 485                 dev_dbg(&pdev->dev, "Frame error\n");
 486
 487         spin_lock(&i2s->irq_lock);
 488         if (err && i2s->substream)
 489                 snd_pcm_stop_xrun(i2s->substream);
 490         spin_unlock(&i2s->irq_lock);
 491
 492         return IRQ_HANDLED;
 493 }
 494
 495 static bool stm32_i2s_readable_reg(struct device *dev, unsigned int reg)
 496 {
 497         switch (reg) {
 498         case STM32_I2S_CR1_REG:
 499         case STM32_I2S_CFG1_REG:
 500         case STM32_I2S_CFG2_REG:
 501         case STM32_I2S_IER_REG:
 502         case STM32_I2S_SR_REG:
 503         case STM32_I2S_RXDR_REG:
 504         case STM32_I2S_CGFR_REG:
 505         case STM32_I2S_HWCFGR_REG:
 506         case STM32_I2S_VERR_REG:
 507         case STM32_I2S_IPIDR_REG:
 508         case STM32_I2S_SIDR_REG:
 509                 return true;
 510         default:
 511                 return false;
 512         }
 513 }
 514
 515 static bool stm32_i2s_volatile_reg(struct device *dev, unsigned int reg)
 516 {
 517         switch (reg) {
 518         case STM32_I2S_SR_REG:
 519         case STM32_I2S_RXDR_REG:
 520                 return true;
 521         default:
 522                 return false;
 523         }
 524 }
 525
 526 static bool stm32_i2s_writeable_reg(struct device *dev, unsigned int reg)
 527 {
 528         switch (reg) {
 529         case STM32_I2S_CR1_REG:
 530         case STM32_I2S_CFG1_REG:
 531         case STM32_I2S_CFG2_REG:
 532         case STM32_I2S_IER_REG:
 533         case STM32_I2S_IFCR_REG:
 534         case STM32_I2S_TXDR_REG:
 535         case STM32_I2S_CGFR_REG:
 536                 return true;
 537         default:
 538                 return false;
 539         }
 540 }
 541
 542 static int stm32_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
 543 {
 544         struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 545         u32 cgfr;
 546         u32 cgfr_mask =  I2S_CGFR_I2SSTD_MASK | I2S_CGFR_CKPOL |
 547                          I2S_CGFR_WSINV | I2S_CGFR_I2SCFG_MASK;
 548
 549         dev_dbg(cpu_dai->dev, "fmt %x\n", fmt);
 550
 551         /*
 552          * winv = 0 : default behavior (high/low) for all standards
 553          * ckpol = 0 for all standards.
 554          */
 555         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 556         case SND_SOC_DAIFMT_I2S:
 557                 cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_I2S);
 558                 break;
 559         case SND_SOC_DAIFMT_MSB:
 560                 cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_LEFT_J);
 561                 break;
 562         case SND_SOC_DAIFMT_LSB:
 563                 cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_RIGHT_J);
 564                 break;
 565         case SND_SOC_DAIFMT_DSP_A:
 566                 cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_DSP);
 567                 break;
 568         /* DSP_B not mapped on I2S PCM long format. 1 bit offset does not fit */
 569         default:
 570                 dev_err(cpu_dai->dev, "Unsupported protocol %#x\n",
 571                         fmt & SND_SOC_DAIFMT_FORMAT_MASK);
 572                 return -EINVAL;
 573         }
 574
 575         /* DAI clock strobing */
 576         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 577         case SND_SOC_DAIFMT_NB_NF:
 578                 break;
 579         case SND_SOC_DAIFMT_IB_NF:
 580                 cgfr |= I2S_CGFR_CKPOL;
 581                 break;
 582         case SND_SOC_DAIFMT_NB_IF:
 583                 cgfr |= I2S_CGFR_WSINV;
 584                 break;
 585         case SND_SOC_DAIFMT_IB_IF:
 586                 cgfr |= I2S_CGFR_CKPOL;
 587                 cgfr |= I2S_CGFR_WSINV;
 588                 break;
 589         default:
 590                 dev_err(cpu_dai->dev, "Unsupported strobing %#x\n",
 591                         fmt & SND_SOC_DAIFMT_INV_MASK);
 592                 return -EINVAL;
 593         }
 594
 595         /* DAI clock master masks */
 596         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 597         case SND_SOC_DAIFMT_CBM_CFM:
 598                 i2s->ms_flg = I2S_MS_SLAVE;
 599                 break;
 600         case SND_SOC_DAIFMT_CBS_CFS:
 601                 i2s->ms_flg = I2S_MS_MASTER;
 602                 break;
 603         default:
 604                 dev_err(cpu_dai->dev, "Unsupported mode %#x\n",
 605                         fmt & SND_SOC_DAIFMT_MASTER_MASK);
 606                 return -EINVAL;
 607         }
 608
 609         i2s->fmt = fmt;
 610         return regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
 611                                   cgfr_mask, cgfr);
 612 }
 613
 614 static int stm32_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
 615                                 int clk_id, unsigned int freq, int dir)
 616 {
 617         struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 618         int ret = 0;
 619
 620         dev_dbg(cpu_dai->dev, "I2S MCLK frequency is %uHz. mode: %s, dir: %s\n",
 621                 freq, STM32_I2S_IS_MASTER(i2s) ? "master" : "slave",
 622                 dir ? "output" : "input");
 623
 624         /* MCLK generation is available only in master mode */
 625         if (dir == SND_SOC_CLOCK_OUT && STM32_I2S_IS_MASTER(i2s)) {
 626                 if (!i2s->i2smclk) {
 627                         dev_dbg(cpu_dai->dev, "No MCLK registered\n");
 628                         return 0;
 629                 }
 630
 631                 /* Assume shutdown if requested frequency is 0Hz */
 632                 if (!freq) {
 633                         /* Release mclk rate only if rate was actually set */
 634                         if (i2s->mclk_rate) {
 635                                 clk_rate_exclusive_put(i2s->i2smclk);
 636                                 i2s->mclk_rate = 0;
 637                         }
 638                         return regmap_update_bits(i2s->regmap,
 639                                                   STM32_I2S_CGFR_REG,
 640                                                   I2S_CGFR_MCKOE, 0);
 641                 }
 642                 /* If master clock is used, set parent clock now */
 643                 ret = stm32_i2s_set_parent_clock(i2s, freq);
 644                 if (ret)
 645                         return ret;
 646                 ret = clk_set_rate_exclusive(i2s->i2smclk, freq);
 647                 if (ret) {
 648                         dev_err(cpu_dai->dev, "Could not set mclk rate\n");
 649                         return ret;
 650                 }
 651                 ret = regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
 652                                          I2S_CGFR_MCKOE, I2S_CGFR_MCKOE);
 653                 if (!ret)
 654                         i2s->mclk_rate = freq;
 655         }
 656
 657         return ret;
 658 }
 659
 660 static int stm32_i2s_configure_clock(struct snd_soc_dai *cpu_dai,
 661                                      struct snd_pcm_hw_params *params)
 662 {
 663         struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 664         unsigned long i2s_clock_rate;
 665         unsigned int nb_bits, frame_len;
 666         unsigned int rate = params_rate(params);
 667         u32 cgfr;
 668         int ret;
 669
 670         if (!(rate % 11025))
 671                 clk_set_parent(i2s->i2sclk, i2s->x11kclk);
 672         else
 673                 clk_set_parent(i2s->i2sclk, i2s->x8kclk);
 674         i2s_clock_rate = clk_get_rate(i2s->i2sclk);
 675
 676         /*
 677          * mckl = mclk_ratio x ws
 678          *   i2s mode : mclk_ratio = 256
 679          *   dsp mode : mclk_ratio = 128
 680          *
 681          * mclk on
 682          *   i2s mode : div = i2s_clk / (mclk_ratio * ws)
 683          *   dsp mode : div = i2s_clk / (mclk_ratio * ws)
 684          * mclk off
 685          *   i2s mode : div = i2s_clk / (nb_bits x ws)
 686          *   dsp mode : div = i2s_clk / (nb_bits x ws)
 687          */
 688         if (i2s->mclk_rate) {
 689                 ret = stm32_i2s_calc_clk_div(i2s, i2s_clock_rate,
 690                                              i2s->mclk_rate);
 691                 if (ret)
 692                         return ret;
 693         } else {
 694                 frame_len = 32;
 695                 if ((i2s->fmt & SND_SOC_DAIFMT_FORMAT_MASK) ==
 696                     SND_SOC_DAIFMT_DSP_A)
 697                         frame_len = 16;
 698
 699                 /* master clock not enabled */
 700                 ret = regmap_read(i2s->regmap, STM32_I2S_CGFR_REG, &cgfr);
 701                 if (ret < 0)
 702                         return ret;
 703
 704                 nb_bits = frame_len * (FIELD_GET(I2S_CGFR_CHLEN, cgfr) + 1);
 705                 ret = stm32_i2s_calc_clk_div(i2s, i2s_clock_rate,
 706                                              (nb_bits * rate));
 707                 if (ret)
 708                         return ret;
 709         }
 710
 711         ret = stm32_i2s_set_clk_div(i2s);
 712         if (ret < 0)
 713                 return ret;
 714
 715         /* Set bitclock and frameclock to their inactive state */
 716         return regmap_update_bits(i2s->regmap, STM32_I2S_CFG2_REG,
 717                                   I2S_CFG2_AFCNTR, I2S_CFG2_AFCNTR);
 718 }
 719
 720 static int stm32_i2s_configure(struct snd_soc_dai *cpu_dai,
 721                                struct snd_pcm_hw_params *params,
 722                                struct snd_pcm_substream *substream)
 723 {
 724         struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 725         int format = params_width(params);
 726         u32 cfgr, cfgr_mask, cfg1;
 727         unsigned int fthlv;
 728         int ret;
 729
 730         switch (format) {
 731         case 16:
 732                 cfgr = I2S_CGFR_DATLEN_SET(I2S_I2SMOD_DATLEN_16);
 733                 cfgr_mask = I2S_CGFR_DATLEN_MASK | I2S_CGFR_CHLEN;
 734                 break;
 735         case 32:
 736                 cfgr = I2S_CGFR_DATLEN_SET(I2S_I2SMOD_DATLEN_32) |
 737                                            I2S_CGFR_CHLEN;
 738                 cfgr_mask = I2S_CGFR_DATLEN_MASK | I2S_CGFR_CHLEN;
 739                 break;
 740         default:
 741                 dev_err(cpu_dai->dev, "Unexpected format %d", format);
 742                 return -EINVAL;
 743         }
 744
 745         if (STM32_I2S_IS_SLAVE(i2s)) {
 746                 cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_FD_SLAVE);
 747
 748                 /* As data length is either 16 or 32 bits, fixch always set */
 749                 cfgr |= I2S_CGFR_FIXCH;
 750                 cfgr_mask |= I2S_CGFR_FIXCH;
 751         } else {
 752                 cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_FD_MASTER);
 753         }
 754         cfgr_mask |= I2S_CGFR_I2SCFG_MASK;
 755
 756         ret = regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
 757                                  cfgr_mask, cfgr);
 758         if (ret < 0)
 759                 return ret;
 760
 761         fthlv = STM32_I2S_FIFO_SIZE * I2S_FIFO_TH_ONE_QUARTER / 4;
 762         cfg1 = I2S_CFG1_FTHVL_SET(fthlv - 1);
 763
 764         return regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG,
 765                                   I2S_CFG1_FTHVL_MASK, cfg1);
 766 }
 767
 768 static int stm32_i2s_startup(struct snd_pcm_substream *substream,
 769                              struct snd_soc_dai *cpu_dai)
 770 {
 771         struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 772         unsigned long flags;
 773         int ret;
 774
 775         spin_lock_irqsave(&i2s->irq_lock, flags);
 776         i2s->substream = substream;
 777         spin_unlock_irqrestore(&i2s->irq_lock, flags);
 778
 779         if ((i2s->fmt & SND_SOC_DAIFMT_FORMAT_MASK) != SND_SOC_DAIFMT_DSP_A)
 780                 snd_pcm_hw_constraint_single(substream->runtime,
 781                                              SNDRV_PCM_HW_PARAM_CHANNELS, 2);
 782
 783         ret = clk_prepare_enable(i2s->i2sclk);
 784         if (ret < 0) {
 785                 dev_err(cpu_dai->dev, "Failed to enable clock: %d\n", ret);
 786                 return ret;
 787         }
 788
 789         return regmap_write_bits(i2s->regmap, STM32_I2S_IFCR_REG,
 790                                  I2S_IFCR_MASK, I2S_IFCR_MASK);
 791 }
 792
 793 static int stm32_i2s_hw_params(struct snd_pcm_substream *substream,
 794                                struct snd_pcm_hw_params *params,
 795                                struct snd_soc_dai *cpu_dai)
 796 {
 797         struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 798         int ret;
 799
 800         ret = stm32_i2s_configure(cpu_dai, params, substream);
 801         if (ret < 0) {
 802                 dev_err(cpu_dai->dev, "Configuration returned error %d\n", ret);
 803                 return ret;
 804         }
 805
 806         if (STM32_I2S_IS_MASTER(i2s))
 807                 ret = stm32_i2s_configure_clock(cpu_dai, params);
 808
 809         return ret;
 810 }
 811
 812 static int stm32_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 813                              struct snd_soc_dai *cpu_dai)
 814 {
 815         struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 816         bool playback_flg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
 817         u32 cfg1_mask, ier;
 818         int ret;
 819
 820         switch (cmd) {
 821         case SNDRV_PCM_TRIGGER_START:
 822         case SNDRV_PCM_TRIGGER_RESUME:
 823         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 824                 /* Enable i2s */
 825                 dev_dbg(cpu_dai->dev, "start I2S %s\n",
 826                         playback_flg ? "playback" : "capture");
 827
 828                 cfg1_mask = I2S_CFG1_RXDMAEN | I2S_CFG1_TXDMAEN;
 829                 regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG,
 830                                    cfg1_mask, cfg1_mask);
 831
 832                 ret = regmap_update_bits(i2s->regmap, STM32_I2S_CR1_REG,
 833                                          I2S_CR1_SPE, I2S_CR1_SPE);
 834                 if (ret < 0) {
 835                         dev_err(cpu_dai->dev, "Error %d enabling I2S\n", ret);
 836                         return ret;
 837                 }
 838
 839                 ret = regmap_write_bits(i2s->regmap, STM32_I2S_CR1_REG,
 840                                         I2S_CR1_CSTART, I2S_CR1_CSTART);
 841                 if (ret < 0) {
 842                         dev_err(cpu_dai->dev, "Error %d starting I2S\n", ret);
 843                         return ret;
 844                 }
 845
 846                 regmap_write_bits(i2s->regmap, STM32_I2S_IFCR_REG,
 847                                   I2S_IFCR_MASK, I2S_IFCR_MASK);
 848
 849                 spin_lock(&i2s->lock_fd);
 850                 i2s->refcount++;
 851                 if (playback_flg) {
 852                         ier = I2S_IER_UDRIE;
 853                 } else {
 854                         ier = I2S_IER_OVRIE;
 855
 856                         if (STM32_I2S_IS_MASTER(i2s) && i2s->refcount == 1)
 857                                 /* dummy write to gate bus clocks */
 858                                 regmap_write(i2s->regmap,
 859                                              STM32_I2S_TXDR_REG, 0);
 860                 }
 861                 spin_unlock(&i2s->lock_fd);
 862
 863                 if (STM32_I2S_IS_SLAVE(i2s))
 864                         ier |= I2S_IER_TIFREIE;
 865
 866                 regmap_update_bits(i2s->regmap, STM32_I2S_IER_REG, ier, ier);
 867                 break;
 868         case SNDRV_PCM_TRIGGER_STOP:
 869         case SNDRV_PCM_TRIGGER_SUSPEND:
 870         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 871                 dev_dbg(cpu_dai->dev, "stop I2S %s\n",
 872                         playback_flg ? "playback" : "capture");
 873
 874                 if (playback_flg)
 875                         regmap_update_bits(i2s->regmap, STM32_I2S_IER_REG,
 876                                            I2S_IER_UDRIE,
 877                                            (unsigned int)~I2S_IER_UDRIE);
 878                 else
 879                         regmap_update_bits(i2s->regmap, STM32_I2S_IER_REG,
 880                                            I2S_IER_OVRIE,
 881                                            (unsigned int)~I2S_IER_OVRIE);
 882
 883                 spin_lock(&i2s->lock_fd);
 884                 i2s->refcount--;
 885                 if (i2s->refcount) {
 886                         spin_unlock(&i2s->lock_fd);
 887                         break;
 888                 }
 889
 890                 ret = regmap_update_bits(i2s->regmap, STM32_I2S_CR1_REG,
 891                                          I2S_CR1_SPE, 0);
 892                 if (ret < 0) {
 893                         dev_err(cpu_dai->dev, "Error %d disabling I2S\n", ret);
 894                         spin_unlock(&i2s->lock_fd);
 895                         return ret;
 896                 }
 897                 spin_unlock(&i2s->lock_fd);
 898
 899                 cfg1_mask = I2S_CFG1_RXDMAEN | I2S_CFG1_TXDMAEN;
 900                 regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG,
 901                                    cfg1_mask, 0);
 902                 break;
 903         default:
 904                 return -EINVAL;
 905         }
 906
 907         return 0;
 908 }
 909
 910 static void stm32_i2s_shutdown(struct snd_pcm_substream *substream,
 911                                struct snd_soc_dai *cpu_dai)
 912 {
 913         struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 914         unsigned long flags;
 915
 916         clk_disable_unprepare(i2s->i2sclk);
 917
 918         spin_lock_irqsave(&i2s->irq_lock, flags);
 919         i2s->substream = NULL;
 920         spin_unlock_irqrestore(&i2s->irq_lock, flags);
 921 }
 922
 923 static int stm32_i2s_dai_probe(struct snd_soc_dai *cpu_dai)
 924 {
 925         struct stm32_i2s_data *i2s = dev_get_drvdata(cpu_dai->dev);
 926         struct snd_dmaengine_dai_dma_data *dma_data_tx = &i2s->dma_data_tx;
 927         struct snd_dmaengine_dai_dma_data *dma_data_rx = &i2s->dma_data_rx;
 928
 929         /* Buswidth will be set by framework */
 930         dma_data_tx->addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
 931         dma_data_tx->addr = (dma_addr_t)(i2s->phys_addr) + STM32_I2S_TXDR_REG;
 932         dma_data_tx->maxburst = 1;
 933         dma_data_rx->addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
 934         dma_data_rx->addr = (dma_addr_t)(i2s->phys_addr) + STM32_I2S_RXDR_REG;
 935         dma_data_rx->maxburst = 1;
 936
 937         snd_soc_dai_init_dma_data(cpu_dai, dma_data_tx, dma_data_rx);
 938
 939         return 0;
 940 }
 941
 942 static const struct regmap_config stm32_h7_i2s_regmap_conf = {
 943         .reg_bits = 32,
 944         .reg_stride = 4,
 945         .val_bits = 32,
 946         .max_register = STM32_I2S_SIDR_REG,
 947         .readable_reg = stm32_i2s_readable_reg,
 948         .volatile_reg = stm32_i2s_volatile_reg,
 949         .writeable_reg = stm32_i2s_writeable_reg,
 950         .num_reg_defaults_raw = STM32_I2S_SIDR_REG / sizeof(u32) + 1,
 951         .fast_io = true,
 952         .cache_type = REGCACHE_FLAT,
 953 };
 954
 955 static const struct snd_soc_dai_ops stm32_i2s_pcm_dai_ops = {
 956         .set_sysclk     = stm32_i2s_set_sysclk,
 957         .set_fmt        = stm32_i2s_set_dai_fmt,
 958         .startup        = stm32_i2s_startup,
 959         .hw_params      = stm32_i2s_hw_params,
 960         .trigger        = stm32_i2s_trigger,
 961         .shutdown       = stm32_i2s_shutdown,
 962 };
 963
 964 static const struct snd_pcm_hardware stm32_i2s_pcm_hw = {
 965         .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP,
 966         .buffer_bytes_max = 8 * PAGE_SIZE,
 967         .period_bytes_min = 1024,
 968         .period_bytes_max = 4 * PAGE_SIZE,
 969         .periods_min = 2,
 970         .periods_max = 8,
 971 };
 972
 973 static const struct snd_dmaengine_pcm_config stm32_i2s_pcm_config = {
 974         .pcm_hardware   = &stm32_i2s_pcm_hw,
 975         .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
 976         .prealloc_buffer_size = PAGE_SIZE * 8,
 977 };
 978
 979 static const struct snd_soc_component_driver stm32_i2s_component = {
 980         .name = "stm32-i2s",
 981 };
 982
 983 static void stm32_i2s_dai_init(struct snd_soc_pcm_stream *stream,
 984                                char *stream_name)
 985 {
 986         stream->stream_name = stream_name;
 987         stream->channels_min = 1;
 988         stream->channels_max = 2;
 989         stream->rates = SNDRV_PCM_RATE_8000_192000;
 990         stream->formats = SNDRV_PCM_FMTBIT_S16_LE |
 991                                    SNDRV_PCM_FMTBIT_S32_LE;
 992 }
 993
 994 static int stm32_i2s_dais_init(struct platform_device *pdev,
 995                                struct stm32_i2s_data *i2s)
 996 {
 997         struct snd_soc_dai_driver *dai_ptr;
 998
 999         dai_ptr = devm_kzalloc(&pdev->dev, sizeof(struct snd_soc_dai_driver),
1000                                GFP_KERNEL);
1001         if (!dai_ptr)
1002                 return -ENOMEM;
1003
1004         dai_ptr->probe = stm32_i2s_dai_probe;
1005         dai_ptr->ops = &stm32_i2s_pcm_dai_ops;
1006         dai_ptr->id = 1;
1007         stm32_i2s_dai_init(&dai_ptr->playback, "playback");
1008         stm32_i2s_dai_init(&dai_ptr->capture, "capture");
1009         i2s->dai_drv = dai_ptr;
1010
1011         return 0;
1012 }
1013
1014 static const struct of_device_id stm32_i2s_ids[] = {
1015         {
1016                 .compatible = "st,stm32h7-i2s",
1017                 .data = &stm32_h7_i2s_regmap_conf
1018         },
1019         {},
1020 };
1021
1022 static int stm32_i2s_parse_dt(struct platform_device *pdev,
1023                               struct stm32_i2s_data *i2s)
1024 {
1025         struct device_node *np = pdev->dev.of_node;
1026         const struct of_device_id *of_id;
1027         struct reset_control *rst;
1028         struct resource *res;
1029         int irq, ret;
1030
1031         if (!np)
1032                 return -ENODEV;
1033
1034         of_id = of_match_device(stm32_i2s_ids, &pdev->dev);
1035         if (of_id)
1036                 i2s->regmap_conf = (const struct regmap_config *)of_id->data;
1037         else
1038                 return -EINVAL;
1039
1040         i2s->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1041         if (IS_ERR(i2s->base))
1042                 return PTR_ERR(i2s->base);
1043
1044         i2s->phys_addr = res->start;
1045
1046         /* Get clocks */
1047         i2s->pclk = devm_clk_get(&pdev->dev, "pclk");
1048         if (IS_ERR(i2s->pclk))
1049                 return dev_err_probe(&pdev->dev, PTR_ERR(i2s->pclk),
1050                                      "Could not get pclk\n");
1051
1052         i2s->i2sclk = devm_clk_get(&pdev->dev, "i2sclk");
1053         if (IS_ERR(i2s->i2sclk))
1054                 return dev_err_probe(&pdev->dev, PTR_ERR(i2s->i2sclk),
1055                                      "Could not get i2sclk\n");
1056
1057         i2s->x8kclk = devm_clk_get(&pdev->dev, "x8k");
1058         if (IS_ERR(i2s->x8kclk))
1059                 return dev_err_probe(&pdev->dev, PTR_ERR(i2s->x8kclk),
1060                                      "Could not get x8k parent clock\n");
1061
1062         i2s->x11kclk = devm_clk_get(&pdev->dev, "x11k");
1063         if (IS_ERR(i2s->x11kclk))
1064                 return dev_err_probe(&pdev->dev, PTR_ERR(i2s->x11kclk),
1065                                      "Could not get x11k parent clock\n");
1066
1067         /* Register mclk provider if requested */
1068         if (of_find_property(np, "#clock-cells", NULL)) {
1069                 ret = stm32_i2s_add_mclk_provider(i2s);
1070                 if (ret < 0)
1071                         return ret;
1072         }
1073
1074         /* Get irqs */
1075         irq = platform_get_irq(pdev, 0);
1076         if (irq < 0)
1077                 return irq;
1078
1079         ret = devm_request_irq(&pdev->dev, irq, stm32_i2s_isr, IRQF_ONESHOT,
1080                                dev_name(&pdev->dev), i2s);
1081         if (ret) {
1082                 dev_err(&pdev->dev, "irq request returned %d\n", ret);
1083                 return ret;
1084         }
1085
1086         /* Reset */
1087         rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
1088         if (IS_ERR(rst))
1089                 return dev_err_probe(&pdev->dev, PTR_ERR(rst),
1090                                      "Reset controller error\n");
1091
1092         reset_control_assert(rst);
1093         udelay(2);
1094         reset_control_deassert(rst);
1095
1096         return 0;
1097 }
1098
1099 static int stm32_i2s_remove(struct platform_device *pdev)
1100 {
1101         snd_dmaengine_pcm_unregister(&pdev->dev);
1102         snd_soc_unregister_component(&pdev->dev);
1103         pm_runtime_disable(&pdev->dev);
1104
1105         return 0;
1106 }
1107
1108 static int stm32_i2s_probe(struct platform_device *pdev)
1109 {
1110         struct stm32_i2s_data *i2s;
1111         u32 val;
1112         int ret;
1113
1114         i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
1115         if (!i2s)
1116                 return -ENOMEM;
1117
1118         i2s->pdev = pdev;
1119         i2s->ms_flg = I2S_MS_NOT_SET;
1120         spin_lock_init(&i2s->lock_fd);
1121         spin_lock_init(&i2s->irq_lock);
1122         platform_set_drvdata(pdev, i2s);
1123
1124         ret = stm32_i2s_parse_dt(pdev, i2s);
1125         if (ret)
1126                 return ret;
1127
1128         ret = stm32_i2s_dais_init(pdev, i2s);
1129         if (ret)
1130                 return ret;
1131
1132         i2s->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "pclk",
1133                                                 i2s->base, i2s->regmap_conf);
1134         if (IS_ERR(i2s->regmap))
1135                 return dev_err_probe(&pdev->dev, PTR_ERR(i2s->regmap),
1136                                      "Regmap init error\n");
1137
1138         pm_runtime_enable(&pdev->dev);
1139
1140         ret = snd_dmaengine_pcm_register(&pdev->dev, &stm32_i2s_pcm_config, 0);
1141         if (ret)
1142                 return dev_err_probe(&pdev->dev, ret, "PCM DMA register error\n");
1143
1144         ret = snd_soc_register_component(&pdev->dev, &stm32_i2s_component,
1145                                          i2s->dai_drv, 1);
1146         if (ret) {
1147                 snd_dmaengine_pcm_unregister(&pdev->dev);
1148                 return ret;
1149         }
1150
1151         /* Set SPI/I2S in i2s mode */
1152         ret = regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
1153                                  I2S_CGFR_I2SMOD, I2S_CGFR_I2SMOD);
1154         if (ret)
1155                 goto error;
1156
1157         ret = regmap_read(i2s->regmap, STM32_I2S_IPIDR_REG, &val);
1158         if (ret)
1159                 goto error;
1160
1161         if (val == I2S_IPIDR_NUMBER) {
1162                 ret = regmap_read(i2s->regmap, STM32_I2S_HWCFGR_REG, &val);
1163                 if (ret)
1164                         goto error;
1165
1166                 if (!FIELD_GET(I2S_HWCFGR_I2S_SUPPORT_MASK, val)) {
1167                         dev_err(&pdev->dev,
1168                                 "Device does not support i2s mode\n");
1169                         ret = -EPERM;
1170                         goto error;
1171                 }
1172
1173                 ret = regmap_read(i2s->regmap, STM32_I2S_VERR_REG, &val);
1174                 if (ret)
1175                         goto error;
1176
1177                 dev_dbg(&pdev->dev, "I2S version: %lu.%lu registered\n",
1178                         FIELD_GET(I2S_VERR_MAJ_MASK, val),
1179                         FIELD_GET(I2S_VERR_MIN_MASK, val));
1180         }
1181
1182         return ret;
1183
1184 error:
1185         stm32_i2s_remove(pdev);
1186
1187         return ret;
1188 }
1189
1190 MODULE_DEVICE_TABLE(of, stm32_i2s_ids);
1191
1192 #ifdef CONFIG_PM_SLEEP
1193 static int stm32_i2s_suspend(struct device *dev)
1194 {
1195         struct stm32_i2s_data *i2s = dev_get_drvdata(dev);
1196
1197         regcache_cache_only(i2s->regmap, true);
1198         regcache_mark_dirty(i2s->regmap);
1199
1200         return 0;
1201 }
1202
1203 static int stm32_i2s_resume(struct device *dev)
1204 {
1205         struct stm32_i2s_data *i2s = dev_get_drvdata(dev);
1206
1207         regcache_cache_only(i2s->regmap, false);
1208         return regcache_sync(i2s->regmap);
1209 }
1210 #endif /* CONFIG_PM_SLEEP */
1211
1212 static const struct dev_pm_ops stm32_i2s_pm_ops = {
1213         SET_SYSTEM_SLEEP_PM_OPS(stm32_i2s_suspend, stm32_i2s_resume)
1214 };
1215
1216 static struct platform_driver stm32_i2s_driver = {
1217         .driver = {
1218                 .name = "st,stm32-i2s",
1219                 .of_match_table = stm32_i2s_ids,
1220                 .pm = &stm32_i2s_pm_ops,
1221         },
1222         .probe = stm32_i2s_probe,
1223         .remove = stm32_i2s_remove,
1224 };
1225
1226 module_platform_driver(stm32_i2s_driver);
1227
1228 MODULE_DESCRIPTION("STM32 Soc i2s Interface");
1229 MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@st.com>");
1230 MODULE_ALIAS("platform:stm32-i2s");
1231 MODULE_LICENSE("GPL v2");