sound/soc/tegra/tegra30_ahub.c

   1 /*
   2  * tegra30_ahub.c - Tegra30 AHUB driver
   3  *
   4  * Copyright (c) 2011,2012, NVIDIA CORPORATION.  All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/clk.h>
  20 #include <linux/device.h>
  21 #include <linux/io.h>
  22 #include <linux/module.h>
  23 #include <linux/of_platform.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/pm_runtime.h>
  26 #include <linux/regmap.h>
  27 #include <linux/slab.h>
  28 #include <mach/clk.h>
  29 #include <mach/dma.h>
  30 #include <sound/soc.h>
  31 #include "tegra30_ahub.h"
  32
  33 #define DRV_NAME "tegra30-ahub"
  34
  35 static struct tegra30_ahub *ahub;
  36
  37 static inline void tegra30_apbif_write(u32 reg, u32 val)
  38 {
  39         regmap_write(ahub->regmap_apbif, reg, val);
  40 }
  41
  42 static inline u32 tegra30_apbif_read(u32 reg)
  43 {
  44         u32 val;
  45         regmap_read(ahub->regmap_apbif, reg, &val);
  46         return val;
  47 }
  48
  49 static inline void tegra30_audio_write(u32 reg, u32 val)
  50 {
  51         regmap_write(ahub->regmap_ahub, reg, val);
  52 }
  53
  54 static int tegra30_ahub_runtime_suspend(struct device *dev)
  55 {
  56         regcache_cache_only(ahub->regmap_apbif, true);
  57         regcache_cache_only(ahub->regmap_ahub, true);
  58
  59         clk_disable_unprepare(ahub->clk_apbif);
  60         clk_disable_unprepare(ahub->clk_d_audio);
  61
  62         return 0;
  63 }
  64
  65 /*
  66  * clk_apbif isn't required for an I2S<->I2S configuration where no PCM data
  67  * is read from or sent to memory. However, that's not something the rest of
  68  * the driver supports right now, so we'll just treat the two clocks as one
  69  * for now.
  70  *
  71  * These functions should not be a plain ref-count. Instead, each active stream
  72  * contributes some requirement to the minimum clock rate, so starting or
  73  * stopping streams should dynamically adjust the clock as required.  However,
  74  * this is not yet implemented.
  75  */
  76 static int tegra30_ahub_runtime_resume(struct device *dev)
  77 {
  78         int ret;
  79
  80         ret = clk_prepare_enable(ahub->clk_d_audio);
  81         if (ret) {
  82                 dev_err(dev, "clk_enable d_audio failed: %d\n", ret);
  83                 return ret;
  84         }
  85         ret = clk_prepare_enable(ahub->clk_apbif);
  86         if (ret) {
  87                 dev_err(dev, "clk_enable apbif failed: %d\n", ret);
  88                 clk_disable(ahub->clk_d_audio);
  89                 return ret;
  90         }
  91
  92         regcache_cache_only(ahub->regmap_apbif, false);
  93         regcache_cache_only(ahub->regmap_ahub, false);
  94
  95         return 0;
  96 }
  97
  98 int tegra30_ahub_allocate_rx_fifo(enum tegra30_ahub_rxcif *rxcif,
  99                                   unsigned long *fiforeg,
 100                                   unsigned long *reqsel)
 101 {
 102         int channel;
 103         u32 reg, val;
 104
 105         channel = find_first_zero_bit(ahub->rx_usage,
 106                                       TEGRA30_AHUB_CHANNEL_CTRL_COUNT);
 107         if (channel >= TEGRA30_AHUB_CHANNEL_CTRL_COUNT)
 108                 return -EBUSY;
 109
 110         __set_bit(channel, ahub->rx_usage);
 111
 112         *rxcif = TEGRA30_AHUB_RXCIF_APBIF_RX0 + channel;
 113         *fiforeg = ahub->apbif_addr + TEGRA30_AHUB_CHANNEL_RXFIFO +
 114                    (channel * TEGRA30_AHUB_CHANNEL_RXFIFO_STRIDE);
 115         *reqsel = ahub->dma_sel + channel;
 116
 117         reg = TEGRA30_AHUB_CHANNEL_CTRL +
 118               (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE);
 119         val = tegra30_apbif_read(reg);
 120         val &= ~(TEGRA30_AHUB_CHANNEL_CTRL_RX_THRESHOLD_MASK |
 121                  TEGRA30_AHUB_CHANNEL_CTRL_RX_PACK_MASK);
 122         val |= (7 << TEGRA30_AHUB_CHANNEL_CTRL_RX_THRESHOLD_SHIFT) |
 123                TEGRA30_AHUB_CHANNEL_CTRL_RX_PACK_EN |
 124                TEGRA30_AHUB_CHANNEL_CTRL_RX_PACK_16;
 125         tegra30_apbif_write(reg, val);
 126
 127         reg = TEGRA30_AHUB_CIF_RX_CTRL +
 128               (channel * TEGRA30_AHUB_CIF_RX_CTRL_STRIDE);
 129         val = (0 << TEGRA30_AUDIOCIF_CTRL_FIFO_THRESHOLD_SHIFT) |
 130               (1 << TEGRA30_AUDIOCIF_CTRL_AUDIO_CHANNELS_SHIFT) |
 131               (1 << TEGRA30_AUDIOCIF_CTRL_CLIENT_CHANNELS_SHIFT) |
 132               TEGRA30_AUDIOCIF_CTRL_AUDIO_BITS_16 |
 133               TEGRA30_AUDIOCIF_CTRL_CLIENT_BITS_16 |
 134               TEGRA30_AUDIOCIF_CTRL_DIRECTION_RX;
 135         tegra30_apbif_write(reg, val);
 136
 137         return 0;
 138 }
 139 EXPORT_SYMBOL_GPL(tegra30_ahub_allocate_rx_fifo);
 140
 141 int tegra30_ahub_enable_rx_fifo(enum tegra30_ahub_rxcif rxcif)
 142 {
 143         int channel = rxcif - TEGRA30_AHUB_RXCIF_APBIF_RX0;
 144         int reg, val;
 145
 146         reg = TEGRA30_AHUB_CHANNEL_CTRL +
 147               (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE);
 148         val = tegra30_apbif_read(reg);
 149         val |= TEGRA30_AHUB_CHANNEL_CTRL_RX_EN;
 150         tegra30_apbif_write(reg, val);
 151
 152         return 0;
 153 }
 154 EXPORT_SYMBOL_GPL(tegra30_ahub_enable_rx_fifo);
 155
 156 int tegra30_ahub_disable_rx_fifo(enum tegra30_ahub_rxcif rxcif)
 157 {
 158         int channel = rxcif - TEGRA30_AHUB_RXCIF_APBIF_RX0;
 159         int reg, val;
 160
 161         reg = TEGRA30_AHUB_CHANNEL_CTRL +
 162               (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE);
 163         val = tegra30_apbif_read(reg);
 164         val &= ~TEGRA30_AHUB_CHANNEL_CTRL_RX_EN;
 165         tegra30_apbif_write(reg, val);
 166
 167         return 0;
 168 }
 169 EXPORT_SYMBOL_GPL(tegra30_ahub_disable_rx_fifo);
 170
 171 int tegra30_ahub_free_rx_fifo(enum tegra30_ahub_rxcif rxcif)
 172 {
 173         int channel = rxcif - TEGRA30_AHUB_RXCIF_APBIF_RX0;
 174
 175         __clear_bit(channel, ahub->rx_usage);
 176
 177         return 0;
 178 }
 179 EXPORT_SYMBOL_GPL(tegra30_ahub_free_rx_fifo);
 180
 181 int tegra30_ahub_allocate_tx_fifo(enum tegra30_ahub_txcif *txcif,
 182                                   unsigned long *fiforeg,
 183                                   unsigned long *reqsel)
 184 {
 185         int channel;
 186         u32 reg, val;
 187
 188         channel = find_first_zero_bit(ahub->tx_usage,
 189                                       TEGRA30_AHUB_CHANNEL_CTRL_COUNT);
 190         if (channel >= TEGRA30_AHUB_CHANNEL_CTRL_COUNT)
 191                 return -EBUSY;
 192
 193         __set_bit(channel, ahub->tx_usage);
 194
 195         *txcif = TEGRA30_AHUB_TXCIF_APBIF_TX0 + channel;
 196         *fiforeg = ahub->apbif_addr + TEGRA30_AHUB_CHANNEL_TXFIFO +
 197                    (channel * TEGRA30_AHUB_CHANNEL_TXFIFO_STRIDE);
 198         *reqsel = ahub->dma_sel + channel;
 199
 200         reg = TEGRA30_AHUB_CHANNEL_CTRL +
 201               (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE);
 202         val = tegra30_apbif_read(reg);
 203         val &= ~(TEGRA30_AHUB_CHANNEL_CTRL_TX_THRESHOLD_MASK |
 204                  TEGRA30_AHUB_CHANNEL_CTRL_TX_PACK_MASK);
 205         val |= (7 << TEGRA30_AHUB_CHANNEL_CTRL_TX_THRESHOLD_SHIFT) |
 206                TEGRA30_AHUB_CHANNEL_CTRL_TX_PACK_EN |
 207                TEGRA30_AHUB_CHANNEL_CTRL_TX_PACK_16;
 208         tegra30_apbif_write(reg, val);
 209
 210         reg = TEGRA30_AHUB_CIF_TX_CTRL +
 211               (channel * TEGRA30_AHUB_CIF_TX_CTRL_STRIDE);
 212         val = (0 << TEGRA30_AUDIOCIF_CTRL_FIFO_THRESHOLD_SHIFT) |
 213               (1 << TEGRA30_AUDIOCIF_CTRL_AUDIO_CHANNELS_SHIFT) |
 214               (1 << TEGRA30_AUDIOCIF_CTRL_CLIENT_CHANNELS_SHIFT) |
 215               TEGRA30_AUDIOCIF_CTRL_AUDIO_BITS_16 |
 216               TEGRA30_AUDIOCIF_CTRL_CLIENT_BITS_16 |
 217               TEGRA30_AUDIOCIF_CTRL_DIRECTION_TX;
 218         tegra30_apbif_write(reg, val);
 219
 220         return 0;
 221 }
 222 EXPORT_SYMBOL_GPL(tegra30_ahub_allocate_tx_fifo);
 223
 224 int tegra30_ahub_enable_tx_fifo(enum tegra30_ahub_txcif txcif)
 225 {
 226         int channel = txcif - TEGRA30_AHUB_TXCIF_APBIF_TX0;
 227         int reg, val;
 228
 229         reg = TEGRA30_AHUB_CHANNEL_CTRL +
 230               (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE);
 231         val = tegra30_apbif_read(reg);
 232         val |= TEGRA30_AHUB_CHANNEL_CTRL_TX_EN;
 233         tegra30_apbif_write(reg, val);
 234
 235         return 0;
 236 }
 237 EXPORT_SYMBOL_GPL(tegra30_ahub_enable_tx_fifo);
 238
 239 int tegra30_ahub_disable_tx_fifo(enum tegra30_ahub_txcif txcif)
 240 {
 241         int channel = txcif - TEGRA30_AHUB_TXCIF_APBIF_TX0;
 242         int reg, val;
 243
 244         reg = TEGRA30_AHUB_CHANNEL_CTRL +
 245               (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE);
 246         val = tegra30_apbif_read(reg);
 247         val &= ~TEGRA30_AHUB_CHANNEL_CTRL_TX_EN;
 248         tegra30_apbif_write(reg, val);
 249
 250         return 0;
 251 }
 252 EXPORT_SYMBOL_GPL(tegra30_ahub_disable_tx_fifo);
 253
 254 int tegra30_ahub_free_tx_fifo(enum tegra30_ahub_txcif txcif)
 255 {
 256         int channel = txcif - TEGRA30_AHUB_TXCIF_APBIF_TX0;
 257
 258         __clear_bit(channel, ahub->tx_usage);
 259
 260         return 0;
 261 }
 262 EXPORT_SYMBOL_GPL(tegra30_ahub_free_tx_fifo);
 263
 264 int tegra30_ahub_set_rx_cif_source(enum tegra30_ahub_rxcif rxcif,
 265                                    enum tegra30_ahub_txcif txcif)
 266 {
 267         int channel = rxcif - TEGRA30_AHUB_RXCIF_APBIF_RX0;
 268         int reg;
 269
 270         reg = TEGRA30_AHUB_AUDIO_RX +
 271               (channel * TEGRA30_AHUB_AUDIO_RX_STRIDE);
 272         tegra30_audio_write(reg, 1 << txcif);
 273
 274         return 0;
 275 }
 276 EXPORT_SYMBOL_GPL(tegra30_ahub_set_rx_cif_source);
 277
 278 int tegra30_ahub_unset_rx_cif_source(enum tegra30_ahub_rxcif rxcif)
 279 {
 280         int channel = rxcif - TEGRA30_AHUB_RXCIF_APBIF_RX0;
 281         int reg;
 282
 283         reg = TEGRA30_AHUB_AUDIO_RX +
 284               (channel * TEGRA30_AHUB_AUDIO_RX_STRIDE);
 285         tegra30_audio_write(reg, 0);
 286
 287         return 0;
 288 }
 289 EXPORT_SYMBOL_GPL(tegra30_ahub_unset_rx_cif_source);
 290
 291 static const char * const configlink_clocks[] __devinitconst = {
 292         "i2s0",
 293         "i2s1",
 294         "i2s2",
 295         "i2s3",
 296         "i2s4",
 297         "dam0",
 298         "dam1",
 299         "dam2",
 300         "spdif_in",
 301 };
 302
 303 struct of_dev_auxdata ahub_auxdata[] __devinitdata = {
 304         OF_DEV_AUXDATA("nvidia,tegra30-i2s", 0x70080300, "tegra30-i2s.0", NULL),
 305         OF_DEV_AUXDATA("nvidia,tegra30-i2s", 0x70080400, "tegra30-i2s.1", NULL),
 306         OF_DEV_AUXDATA("nvidia,tegra30-i2s", 0x70080500, "tegra30-i2s.2", NULL),
 307         OF_DEV_AUXDATA("nvidia,tegra30-i2s", 0x70080600, "tegra30-i2s.3", NULL),
 308         OF_DEV_AUXDATA("nvidia,tegra30-i2s", 0x70080700, "tegra30-i2s.4", NULL),
 309         {}
 310 };
 311
 312 #define LAST_REG(name) \
 313         (TEGRA30_AHUB_##name + \
 314          (TEGRA30_AHUB_##name##_STRIDE * TEGRA30_AHUB_##name##_COUNT) - 4)
 315
 316 #define REG_IN_ARRAY(reg, name) \
 317         ((reg >= TEGRA30_AHUB_##name) && \
 318          (reg <= LAST_REG(name) && \
 319          (!((reg - TEGRA30_AHUB_##name) % TEGRA30_AHUB_##name##_STRIDE))))
 320
 321 static bool tegra30_ahub_apbif_wr_rd_reg(struct device *dev, unsigned int reg)
 322 {
 323         switch (reg) {
 324         case TEGRA30_AHUB_CONFIG_LINK_CTRL:
 325         case TEGRA30_AHUB_MISC_CTRL:
 326         case TEGRA30_AHUB_APBDMA_LIVE_STATUS:
 327         case TEGRA30_AHUB_I2S_LIVE_STATUS:
 328         case TEGRA30_AHUB_SPDIF_LIVE_STATUS:
 329         case TEGRA30_AHUB_I2S_INT_MASK:
 330         case TEGRA30_AHUB_DAM_INT_MASK:
 331         case TEGRA30_AHUB_SPDIF_INT_MASK:
 332         case TEGRA30_AHUB_APBIF_INT_MASK:
 333         case TEGRA30_AHUB_I2S_INT_STATUS:
 334         case TEGRA30_AHUB_DAM_INT_STATUS:
 335         case TEGRA30_AHUB_SPDIF_INT_STATUS:
 336         case TEGRA30_AHUB_APBIF_INT_STATUS:
 337         case TEGRA30_AHUB_I2S_INT_SOURCE:
 338         case TEGRA30_AHUB_DAM_INT_SOURCE:
 339         case TEGRA30_AHUB_SPDIF_INT_SOURCE:
 340         case TEGRA30_AHUB_APBIF_INT_SOURCE:
 341         case TEGRA30_AHUB_I2S_INT_SET:
 342         case TEGRA30_AHUB_DAM_INT_SET:
 343         case TEGRA30_AHUB_SPDIF_INT_SET:
 344         case TEGRA30_AHUB_APBIF_INT_SET:
 345                 return true;
 346         default:
 347                 break;
 348         };
 349
 350         if (REG_IN_ARRAY(reg, CHANNEL_CTRL) ||
 351             REG_IN_ARRAY(reg, CHANNEL_CLEAR) ||
 352             REG_IN_ARRAY(reg, CHANNEL_STATUS) ||
 353             REG_IN_ARRAY(reg, CHANNEL_TXFIFO) ||
 354             REG_IN_ARRAY(reg, CHANNEL_RXFIFO) ||
 355             REG_IN_ARRAY(reg, CIF_TX_CTRL) ||
 356             REG_IN_ARRAY(reg, CIF_RX_CTRL) ||
 357             REG_IN_ARRAY(reg, DAM_LIVE_STATUS))
 358                 return true;
 359
 360         return false;
 361 }
 362
 363 static bool tegra30_ahub_apbif_volatile_reg(struct device *dev,
 364                                             unsigned int reg)
 365 {
 366         switch (reg) {
 367         case TEGRA30_AHUB_CONFIG_LINK_CTRL:
 368         case TEGRA30_AHUB_MISC_CTRL:
 369         case TEGRA30_AHUB_APBDMA_LIVE_STATUS:
 370         case TEGRA30_AHUB_I2S_LIVE_STATUS:
 371         case TEGRA30_AHUB_SPDIF_LIVE_STATUS:
 372         case TEGRA30_AHUB_I2S_INT_STATUS:
 373         case TEGRA30_AHUB_DAM_INT_STATUS:
 374         case TEGRA30_AHUB_SPDIF_INT_STATUS:
 375         case TEGRA30_AHUB_APBIF_INT_STATUS:
 376         case TEGRA30_AHUB_I2S_INT_SET:
 377         case TEGRA30_AHUB_DAM_INT_SET:
 378         case TEGRA30_AHUB_SPDIF_INT_SET:
 379         case TEGRA30_AHUB_APBIF_INT_SET:
 380                 return true;
 381         default:
 382                 break;
 383         };
 384
 385         if (REG_IN_ARRAY(reg, CHANNEL_CLEAR) ||
 386             REG_IN_ARRAY(reg, CHANNEL_STATUS) ||
 387             REG_IN_ARRAY(reg, CHANNEL_TXFIFO) ||
 388             REG_IN_ARRAY(reg, CHANNEL_RXFIFO) ||
 389             REG_IN_ARRAY(reg, DAM_LIVE_STATUS))
 390                 return true;
 391
 392         return false;
 393 }
 394
 395 static bool tegra30_ahub_apbif_precious_reg(struct device *dev,
 396                                             unsigned int reg)
 397 {
 398         if (REG_IN_ARRAY(reg, CHANNEL_TXFIFO) ||
 399             REG_IN_ARRAY(reg, CHANNEL_RXFIFO))
 400                 return true;
 401
 402         return false;
 403 }
 404
 405 static const struct regmap_config tegra30_ahub_apbif_regmap_config = {
 406         .name = "apbif",
 407         .reg_bits = 32,
 408         .val_bits = 32,
 409         .reg_stride = 4,
 410         .max_register = TEGRA30_AHUB_APBIF_INT_SET,
 411         .writeable_reg = tegra30_ahub_apbif_wr_rd_reg,
 412         .readable_reg = tegra30_ahub_apbif_wr_rd_reg,
 413         .volatile_reg = tegra30_ahub_apbif_volatile_reg,
 414         .precious_reg = tegra30_ahub_apbif_precious_reg,
 415         .cache_type = REGCACHE_RBTREE,
 416 };
 417
 418 static bool tegra30_ahub_ahub_wr_rd_reg(struct device *dev, unsigned int reg)
 419 {
 420         if (REG_IN_ARRAY(reg, AUDIO_RX))
 421                 return true;
 422
 423         return false;
 424 }
 425
 426 static const struct regmap_config tegra30_ahub_ahub_regmap_config = {
 427         .name = "ahub",
 428         .reg_bits = 32,
 429         .val_bits = 32,
 430         .reg_stride = 4,
 431         .max_register = LAST_REG(AUDIO_RX),
 432         .writeable_reg = tegra30_ahub_ahub_wr_rd_reg,
 433         .readable_reg = tegra30_ahub_ahub_wr_rd_reg,
 434         .cache_type = REGCACHE_RBTREE,
 435 };
 436
 437 static int __devinit tegra30_ahub_probe(struct platform_device *pdev)
 438 {
 439         struct clk *clk;
 440         int i;
 441         struct resource *res0, *res1, *region;
 442         u32 of_dma[2];
 443         void __iomem *regs_apbif, *regs_ahub;
 444         int ret = 0;
 445
 446         if (ahub)
 447                 return -ENODEV;
 448
 449         /*
 450          * The AHUB hosts a register bus: the "configlink". For this to
 451          * operate correctly, all devices on this bus must be out of reset.
 452          * Ensure that here.
 453          */
 454         for (i = 0; i < ARRAY_SIZE(configlink_clocks); i++) {
 455                 clk = clk_get_sys(NULL, configlink_clocks[i]);
 456                 if (IS_ERR(clk)) {
 457                         dev_err(&pdev->dev, "Can't get clock %s\n",
 458                                 configlink_clocks[i]);
 459                         ret = PTR_ERR(clk);
 460                         goto err;
 461                 }
 462                 tegra_periph_reset_deassert(clk);
 463                 clk_put(clk);
 464         }
 465
 466         ahub = devm_kzalloc(&pdev->dev, sizeof(struct tegra30_ahub),
 467                             GFP_KERNEL);
 468         if (!ahub) {
 469                 dev_err(&pdev->dev, "Can't allocate tegra30_ahub\n");
 470                 ret = -ENOMEM;
 471                 goto err;
 472         }
 473         dev_set_drvdata(&pdev->dev, ahub);
 474
 475         ahub->dev = &pdev->dev;
 476
 477         ahub->clk_d_audio = clk_get(&pdev->dev, "d_audio");
 478         if (IS_ERR(ahub->clk_d_audio)) {
 479                 dev_err(&pdev->dev, "Can't retrieve ahub d_audio clock\n");
 480                 ret = PTR_ERR(ahub->clk_d_audio);
 481                 goto err;
 482         }
 483
 484         ahub->clk_apbif = clk_get(&pdev->dev, "apbif");
 485         if (IS_ERR(ahub->clk_apbif)) {
 486                 dev_err(&pdev->dev, "Can't retrieve ahub apbif clock\n");
 487                 ret = PTR_ERR(ahub->clk_apbif);
 488                 goto err_clk_put_d_audio;
 489         }
 490
 491         if (of_property_read_u32_array(pdev->dev.of_node,
 492                                 "nvidia,dma-request-selector",
 493                                 of_dma, 2) < 0) {
 494                 dev_err(&pdev->dev,
 495                         "Missing property nvidia,dma-request-selector\n");
 496                 ret = -ENODEV;
 497                 goto err_clk_put_d_audio;
 498         }
 499         ahub->dma_sel = of_dma[1];
 500
 501         res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 502         if (!res0) {
 503                 dev_err(&pdev->dev, "No apbif memory resource\n");
 504                 ret = -ENODEV;
 505                 goto err_clk_put_apbif;
 506         }
 507
 508         region = devm_request_mem_region(&pdev->dev, res0->start,
 509                                          resource_size(res0), DRV_NAME);
 510         if (!region) {
 511                 dev_err(&pdev->dev, "request region apbif failed\n");
 512                 ret = -EBUSY;
 513                 goto err_clk_put_apbif;
 514         }
 515         ahub->apbif_addr = res0->start;
 516
 517         regs_apbif = devm_ioremap(&pdev->dev, res0->start,
 518                                   resource_size(res0));
 519         if (!regs_apbif) {
 520                 dev_err(&pdev->dev, "ioremap apbif failed\n");
 521                 ret = -ENOMEM;
 522                 goto err_clk_put_apbif;
 523         }
 524
 525         ahub->regmap_apbif = devm_regmap_init_mmio(&pdev->dev, regs_apbif,
 526                                         &tegra30_ahub_apbif_regmap_config);
 527         if (IS_ERR(ahub->regmap_apbif)) {
 528                 dev_err(&pdev->dev, "apbif regmap init failed\n");
 529                 ret = PTR_ERR(ahub->regmap_apbif);
 530                 goto err_clk_put_apbif;
 531         }
 532         regcache_cache_only(ahub->regmap_apbif, true);
 533
 534         res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 535         if (!res1) {
 536                 dev_err(&pdev->dev, "No ahub memory resource\n");
 537                 ret = -ENODEV;
 538                 goto err_clk_put_apbif;
 539         }
 540
 541         region = devm_request_mem_region(&pdev->dev, res1->start,
 542                                          resource_size(res1), DRV_NAME);
 543         if (!region) {
 544                 dev_err(&pdev->dev, "request region ahub failed\n");
 545                 ret = -EBUSY;
 546                 goto err_clk_put_apbif;
 547         }
 548
 549         regs_ahub = devm_ioremap(&pdev->dev, res1->start,
 550                                  resource_size(res1));
 551         if (!regs_ahub) {
 552                 dev_err(&pdev->dev, "ioremap ahub failed\n");
 553                 ret = -ENOMEM;
 554                 goto err_clk_put_apbif;
 555         }
 556
 557         ahub->regmap_ahub = devm_regmap_init_mmio(&pdev->dev, regs_ahub,
 558                                         &tegra30_ahub_ahub_regmap_config);
 559         if (IS_ERR(ahub->regmap_ahub)) {
 560                 dev_err(&pdev->dev, "ahub regmap init failed\n");
 561                 ret = PTR_ERR(ahub->regmap_ahub);
 562                 goto err_clk_put_apbif;
 563         }
 564         regcache_cache_only(ahub->regmap_ahub, true);
 565
 566         pm_runtime_enable(&pdev->dev);
 567         if (!pm_runtime_enabled(&pdev->dev)) {
 568                 ret = tegra30_ahub_runtime_resume(&pdev->dev);
 569                 if (ret)
 570                         goto err_pm_disable;
 571         }
 572
 573         of_platform_populate(pdev->dev.of_node, NULL, ahub_auxdata,
 574                              &pdev->dev);
 575
 576         return 0;
 577
 578 err_pm_disable:
 579         pm_runtime_disable(&pdev->dev);
 580 err_clk_put_apbif:
 581         clk_put(ahub->clk_apbif);
 582 err_clk_put_d_audio:
 583         clk_put(ahub->clk_d_audio);
 584         ahub = 0;
 585 err:
 586         return ret;
 587 }
 588
 589 static int __devexit tegra30_ahub_remove(struct platform_device *pdev)
 590 {
 591         if (!ahub)
 592                 return -ENODEV;
 593
 594         pm_runtime_disable(&pdev->dev);
 595         if (!pm_runtime_status_suspended(&pdev->dev))
 596                 tegra30_ahub_runtime_suspend(&pdev->dev);
 597
 598         clk_put(ahub->clk_apbif);
 599         clk_put(ahub->clk_d_audio);
 600
 601         ahub = 0;
 602
 603         return 0;
 604 }
 605
 606 static const struct of_device_id tegra30_ahub_of_match[] __devinitconst = {
 607         { .compatible = "nvidia,tegra30-ahub", },
 608         {},
 609 };
 610
 611 static const struct dev_pm_ops tegra30_ahub_pm_ops __devinitconst = {
 612         SET_RUNTIME_PM_OPS(tegra30_ahub_runtime_suspend,
 613                            tegra30_ahub_runtime_resume, NULL)
 614 };
 615
 616 static struct platform_driver tegra30_ahub_driver = {
 617         .probe = tegra30_ahub_probe,
 618         .remove = __devexit_p(tegra30_ahub_remove),
 619         .driver = {
 620                 .name = DRV_NAME,
 621                 .owner = THIS_MODULE,
 622                 .of_match_table = tegra30_ahub_of_match,
 623                 .pm = &tegra30_ahub_pm_ops,
 624         },
 625 };
 626 module_platform_driver(tegra30_ahub_driver);
 627
 628 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 629 MODULE_DESCRIPTION("Tegra30 AHUB driver");
 630 MODULE_LICENSE("GPL v2");
 631 MODULE_ALIAS("platform:" DRV_NAME);
 632 MODULE_DEVICE_TABLE(of, tegra30_ahub_of_match);