drivers/spi/spi-omap2-mcspi.c

   1 /*
   2  * OMAP2 McSPI controller driver
   3  *
   4  * Copyright (C) 2005, 2006 Nokia Corporation
   5  * Author:      Samuel Ortiz <samuel.ortiz@nokia.com> and
   6  *              Juha Yrj�l� <juha.yrjola@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/init.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/module.h>
  28 #include <linux/device.h>
  29 #include <linux/delay.h>
  30 #include <linux/dma-mapping.h>
  31 #include <linux/dmaengine.h>
  32 #include <linux/omap-dma.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/err.h>
  35 #include <linux/clk.h>
  36 #include <linux/io.h>
  37 #include <linux/slab.h>
  38 #include <linux/pm_runtime.h>
  39 #include <linux/of.h>
  40 #include <linux/of_device.h>
  41 #include <linux/pinctrl/consumer.h>
  42
  43 #include <linux/spi/spi.h>
  44
  45 #include <linux/platform_data/spi-omap2-mcspi.h>
  46
  47 #define OMAP2_MCSPI_MAX_FREQ            48000000
  48 #define SPI_AUTOSUSPEND_TIMEOUT         2000
  49
  50 #define OMAP2_MCSPI_REVISION            0x00
  51 #define OMAP2_MCSPI_SYSSTATUS           0x14
  52 #define OMAP2_MCSPI_IRQSTATUS           0x18
  53 #define OMAP2_MCSPI_IRQENABLE           0x1c
  54 #define OMAP2_MCSPI_WAKEUPENABLE        0x20
  55 #define OMAP2_MCSPI_SYST                0x24
  56 #define OMAP2_MCSPI_MODULCTRL           0x28
  57
  58 /* per-channel banks, 0x14 bytes each, first is: */
  59 #define OMAP2_MCSPI_CHCONF0             0x2c
  60 #define OMAP2_MCSPI_CHSTAT0             0x30
  61 #define OMAP2_MCSPI_CHCTRL0             0x34
  62 #define OMAP2_MCSPI_TX0                 0x38
  63 #define OMAP2_MCSPI_RX0                 0x3c
  64
  65 /* per-register bitmasks: */
  66
  67 #define OMAP2_MCSPI_MODULCTRL_SINGLE    BIT(0)
  68 #define OMAP2_MCSPI_MODULCTRL_MS        BIT(2)
  69 #define OMAP2_MCSPI_MODULCTRL_STEST     BIT(3)
  70
  71 #define OMAP2_MCSPI_CHCONF_PHA          BIT(0)
  72 #define OMAP2_MCSPI_CHCONF_POL          BIT(1)
  73 #define OMAP2_MCSPI_CHCONF_CLKD_MASK    (0x0f << 2)
  74 #define OMAP2_MCSPI_CHCONF_EPOL         BIT(6)
  75 #define OMAP2_MCSPI_CHCONF_WL_MASK      (0x1f << 7)
  76 #define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY  BIT(12)
  77 #define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY  BIT(13)
  78 #define OMAP2_MCSPI_CHCONF_TRM_MASK     (0x03 << 12)
  79 #define OMAP2_MCSPI_CHCONF_DMAW         BIT(14)
  80 #define OMAP2_MCSPI_CHCONF_DMAR         BIT(15)
  81 #define OMAP2_MCSPI_CHCONF_DPE0         BIT(16)
  82 #define OMAP2_MCSPI_CHCONF_DPE1         BIT(17)
  83 #define OMAP2_MCSPI_CHCONF_IS           BIT(18)
  84 #define OMAP2_MCSPI_CHCONF_TURBO        BIT(19)
  85 #define OMAP2_MCSPI_CHCONF_FORCE        BIT(20)
  86
  87 #define OMAP2_MCSPI_CHSTAT_RXS          BIT(0)
  88 #define OMAP2_MCSPI_CHSTAT_TXS          BIT(1)
  89 #define OMAP2_MCSPI_CHSTAT_EOT          BIT(2)
  90
  91 #define OMAP2_MCSPI_CHCTRL_EN           BIT(0)
  92
  93 #define OMAP2_MCSPI_WAKEUPENABLE_WKEN   BIT(0)
  94
  95 /* We have 2 DMA channels per CS, one for RX and one for TX */
  96 struct omap2_mcspi_dma {
  97         struct dma_chan *dma_tx;
  98         struct dma_chan *dma_rx;
  99
 100         int dma_tx_sync_dev;
 101         int dma_rx_sync_dev;
 102
 103         struct completion dma_tx_completion;
 104         struct completion dma_rx_completion;
 105 };
 106
 107 /* use PIO for small transfers, avoiding DMA setup/teardown overhead and
 108  * cache operations; better heuristics consider wordsize and bitrate.
 109  */
 110 #define DMA_MIN_BYTES                   160
 111
 112
 113 /*
 114  * Used for context save and restore, structure members to be updated whenever
 115  * corresponding registers are modified.
 116  */
 117 struct omap2_mcspi_regs {
 118         u32 modulctrl;
 119         u32 wakeupenable;
 120         struct list_head cs;
 121 };
 122
 123 struct omap2_mcspi {
 124         struct spi_master       *master;
 125         /* Virtual base address of the controller */
 126         void __iomem            *base;
 127         unsigned long           phys;
 128         /* SPI1 has 4 channels, while SPI2 has 2 */
 129         struct omap2_mcspi_dma  *dma_channels;
 130         struct device           *dev;
 131         struct omap2_mcspi_regs ctx;
 132         unsigned int            pin_dir:1;
 133 };
 134
 135 struct omap2_mcspi_cs {
 136         void __iomem            *base;
 137         unsigned long           phys;
 138         int                     word_len;
 139         struct list_head        node;
 140         /* Context save and restore shadow register */
 141         u32                     chconf0;
 142 };
 143
 144 static inline void mcspi_write_reg(struct spi_master *master,
 145                 int idx, u32 val)
 146 {
 147         struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
 148
 149         __raw_writel(val, mcspi->base + idx);
 150 }
 151
 152 static inline u32 mcspi_read_reg(struct spi_master *master, int idx)
 153 {
 154         struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
 155
 156         return __raw_readl(mcspi->base + idx);
 157 }
 158
 159 static inline void mcspi_write_cs_reg(const struct spi_device *spi,
 160                 int idx, u32 val)
 161 {
 162         struct omap2_mcspi_cs   *cs = spi->controller_state;
 163
 164         __raw_writel(val, cs->base +  idx);
 165 }
 166
 167 static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx)
 168 {
 169         struct omap2_mcspi_cs   *cs = spi->controller_state;
 170
 171         return __raw_readl(cs->base + idx);
 172 }
 173
 174 static inline u32 mcspi_cached_chconf0(const struct spi_device *spi)
 175 {
 176         struct omap2_mcspi_cs *cs = spi->controller_state;
 177
 178         return cs->chconf0;
 179 }
 180
 181 static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val)
 182 {
 183         struct omap2_mcspi_cs *cs = spi->controller_state;
 184
 185         cs->chconf0 = val;
 186         mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val);
 187         mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0);
 188 }
 189
 190 static void omap2_mcspi_set_dma_req(const struct spi_device *spi,
 191                 int is_read, int enable)
 192 {
 193         u32 l, rw;
 194
 195         l = mcspi_cached_chconf0(spi);
 196
 197         if (is_read) /* 1 is read, 0 write */
 198                 rw = OMAP2_MCSPI_CHCONF_DMAR;
 199         else
 200                 rw = OMAP2_MCSPI_CHCONF_DMAW;
 201
 202         if (enable)
 203                 l |= rw;
 204         else
 205                 l &= ~rw;
 206
 207         mcspi_write_chconf0(spi, l);
 208 }
 209
 210 static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable)
 211 {
 212         u32 l;
 213
 214         l = enable ? OMAP2_MCSPI_CHCTRL_EN : 0;
 215         mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, l);
 216         /* Flash post-writes */
 217         mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0);
 218 }
 219
 220 static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active)
 221 {
 222         u32 l;
 223
 224         l = mcspi_cached_chconf0(spi);
 225         if (cs_active)
 226                 l |= OMAP2_MCSPI_CHCONF_FORCE;
 227         else
 228                 l &= ~OMAP2_MCSPI_CHCONF_FORCE;
 229
 230         mcspi_write_chconf0(spi, l);
 231 }
 232
 233 static void omap2_mcspi_set_master_mode(struct spi_master *master)
 234 {
 235         struct omap2_mcspi      *mcspi = spi_master_get_devdata(master);
 236         struct omap2_mcspi_regs *ctx = &mcspi->ctx;
 237         u32 l;
 238
 239         /*
 240          * Setup when switching from (reset default) slave mode
 241          * to single-channel master mode
 242          */
 243         l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL);
 244         l &= ~(OMAP2_MCSPI_MODULCTRL_STEST | OMAP2_MCSPI_MODULCTRL_MS);
 245         l |= OMAP2_MCSPI_MODULCTRL_SINGLE;
 246         mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l);
 247
 248         ctx->modulctrl = l;
 249 }
 250
 251 static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi)
 252 {
 253         struct spi_master       *spi_cntrl = mcspi->master;
 254         struct omap2_mcspi_regs *ctx = &mcspi->ctx;
 255         struct omap2_mcspi_cs   *cs;
 256
 257         /* McSPI: context restore */
 258         mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_MODULCTRL, ctx->modulctrl);
 259         mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_WAKEUPENABLE, ctx->wakeupenable);
 260
 261         list_for_each_entry(cs, &ctx->cs, node)
 262                 __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
 263 }
 264
 265 static int omap2_prepare_transfer(struct spi_master *master)
 266 {
 267         struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
 268
 269         pm_runtime_get_sync(mcspi->dev);
 270         return 0;
 271 }
 272
 273 static int omap2_unprepare_transfer(struct spi_master *master)
 274 {
 275         struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
 276
 277         pm_runtime_mark_last_busy(mcspi->dev);
 278         pm_runtime_put_autosuspend(mcspi->dev);
 279         return 0;
 280 }
 281
 282 static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
 283 {
 284         unsigned long timeout;
 285
 286         timeout = jiffies + msecs_to_jiffies(1000);
 287         while (!(__raw_readl(reg) & bit)) {
 288                 if (time_after(jiffies, timeout)) {
 289                         if (!(__raw_readl(reg) & bit))
 290                                 return -ETIMEDOUT;
 291                         else
 292                                 return 0;
 293                 }
 294                 cpu_relax();
 295         }
 296         return 0;
 297 }
 298
 299 static void omap2_mcspi_rx_callback(void *data)
 300 {
 301         struct spi_device *spi = data;
 302         struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
 303         struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select];
 304
 305         /* We must disable the DMA RX request */
 306         omap2_mcspi_set_dma_req(spi, 1, 0);
 307
 308         complete(&mcspi_dma->dma_rx_completion);
 309 }
 310
 311 static void omap2_mcspi_tx_callback(void *data)
 312 {
 313         struct spi_device *spi = data;
 314         struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
 315         struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select];
 316
 317         /* We must disable the DMA TX request */
 318         omap2_mcspi_set_dma_req(spi, 0, 0);
 319
 320         complete(&mcspi_dma->dma_tx_completion);
 321 }
 322
 323 static void omap2_mcspi_tx_dma(struct spi_device *spi,
 324                                 struct spi_transfer *xfer,
 325                                 struct dma_slave_config cfg)
 326 {
 327         struct omap2_mcspi      *mcspi;
 328         struct omap2_mcspi_dma  *mcspi_dma;
 329         unsigned int            count;
 330
 331         mcspi = spi_master_get_devdata(spi->master);
 332         mcspi_dma = &mcspi->dma_channels[spi->chip_select];
 333         count = xfer->len;
 334
 335         if (mcspi_dma->dma_tx) {
 336                 struct dma_async_tx_descriptor *tx;
 337                 struct scatterlist sg;
 338
 339                 dmaengine_slave_config(mcspi_dma->dma_tx, &cfg);
 340
 341                 sg_init_table(&sg, 1);
 342                 sg_dma_address(&sg) = xfer->tx_dma;
 343                 sg_dma_len(&sg) = xfer->len;
 344
 345                 tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, &sg, 1,
 346                 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 347                 if (tx) {
 348                         tx->callback = omap2_mcspi_tx_callback;
 349                         tx->callback_param = spi;
 350                         dmaengine_submit(tx);
 351                 } else {
 352                         /* FIXME: fall back to PIO? */
 353                 }
 354         }
 355         dma_async_issue_pending(mcspi_dma->dma_tx);
 356         omap2_mcspi_set_dma_req(spi, 0, 1);
 357
 358 }
 359
 360 static unsigned
 361 omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
 362                                 struct dma_slave_config cfg,
 363                                 unsigned es)
 364 {
 365         struct omap2_mcspi      *mcspi;
 366         struct omap2_mcspi_dma  *mcspi_dma;
 367         unsigned int            count;
 368         u32                     l;
 369         int                     elements = 0;
 370         int                     word_len, element_count;
 371         struct omap2_mcspi_cs   *cs = spi->controller_state;
 372         mcspi = spi_master_get_devdata(spi->master);
 373         mcspi_dma = &mcspi->dma_channels[spi->chip_select];
 374         count = xfer->len;
 375         word_len = cs->word_len;
 376         l = mcspi_cached_chconf0(spi);
 377
 378         if (word_len <= 8)
 379                 element_count = count;
 380         else if (word_len <= 16)
 381                 element_count = count >> 1;
 382         else /* word_len <= 32 */
 383                 element_count = count >> 2;
 384
 385         if (mcspi_dma->dma_rx) {
 386                 struct dma_async_tx_descriptor *tx;
 387                 struct scatterlist sg;
 388                 size_t len = xfer->len - es;
 389
 390                 dmaengine_slave_config(mcspi_dma->dma_rx, &cfg);
 391
 392                 if (l & OMAP2_MCSPI_CHCONF_TURBO)
 393                         len -= es;
 394
 395                 sg_init_table(&sg, 1);
 396                 sg_dma_address(&sg) = xfer->rx_dma;
 397                 sg_dma_len(&sg) = len;
 398
 399                 tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, &sg, 1,
 400                                 DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT |
 401                                 DMA_CTRL_ACK);
 402                 if (tx) {
 403                         tx->callback = omap2_mcspi_rx_callback;
 404                         tx->callback_param = spi;
 405                         dmaengine_submit(tx);
 406                 } else {
 407                                 /* FIXME: fall back to PIO? */
 408                 }
 409         }
 410
 411         dma_async_issue_pending(mcspi_dma->dma_rx);
 412         omap2_mcspi_set_dma_req(spi, 1, 1);
 413
 414         wait_for_completion(&mcspi_dma->dma_rx_completion);
 415         dma_unmap_single(mcspi->dev, xfer->rx_dma, count,
 416                          DMA_FROM_DEVICE);
 417         omap2_mcspi_set_enable(spi, 0);
 418
 419         elements = element_count - 1;
 420
 421         if (l & OMAP2_MCSPI_CHCONF_TURBO) {
 422                 elements--;
 423
 424                 if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
 425                                    & OMAP2_MCSPI_CHSTAT_RXS)) {
 426                         u32 w;
 427
 428                         w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
 429                         if (word_len <= 8)
 430                                 ((u8 *)xfer->rx_buf)[elements++] = w;
 431                         else if (word_len <= 16)
 432                                 ((u16 *)xfer->rx_buf)[elements++] = w;
 433                         else /* word_len <= 32 */
 434                                 ((u32 *)xfer->rx_buf)[elements++] = w;
 435                 } else {
 436                         dev_err(&spi->dev, "DMA RX penultimate word empty");
 437                         count -= (word_len <= 8)  ? 2 :
 438                                 (word_len <= 16) ? 4 :
 439                                 /* word_len <= 32 */ 8;
 440                         omap2_mcspi_set_enable(spi, 1);
 441                         return count;
 442                 }
 443         }
 444         if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
 445                                 & OMAP2_MCSPI_CHSTAT_RXS)) {
 446                 u32 w;
 447
 448                 w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
 449                 if (word_len <= 8)
 450                         ((u8 *)xfer->rx_buf)[elements] = w;
 451                 else if (word_len <= 16)
 452                         ((u16 *)xfer->rx_buf)[elements] = w;
 453                 else /* word_len <= 32 */
 454                         ((u32 *)xfer->rx_buf)[elements] = w;
 455         } else {
 456                 dev_err(&spi->dev, "DMA RX last word empty");
 457                 count -= (word_len <= 8)  ? 1 :
 458                          (word_len <= 16) ? 2 :
 459                        /* word_len <= 32 */ 4;
 460         }
 461         omap2_mcspi_set_enable(spi, 1);
 462         return count;
 463 }
 464
 465 static unsigned
 466 omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
 467 {
 468         struct omap2_mcspi      *mcspi;
 469         struct omap2_mcspi_cs   *cs = spi->controller_state;
 470         struct omap2_mcspi_dma  *mcspi_dma;
 471         unsigned int            count;
 472         u32                     l;
 473         u8                      *rx;
 474         const u8                *tx;
 475         struct dma_slave_config cfg;
 476         enum dma_slave_buswidth width;
 477         unsigned es;
 478         void __iomem            *chstat_reg;
 479
 480         mcspi = spi_master_get_devdata(spi->master);
 481         mcspi_dma = &mcspi->dma_channels[spi->chip_select];
 482         l = mcspi_cached_chconf0(spi);
 483
 484
 485         if (cs->word_len <= 8) {
 486                 width = DMA_SLAVE_BUSWIDTH_1_BYTE;
 487                 es = 1;
 488         } else if (cs->word_len <= 16) {
 489                 width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 490                 es = 2;
 491         } else {
 492                 width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 493                 es = 4;
 494         }
 495
 496         memset(&cfg, 0, sizeof(cfg));
 497         cfg.src_addr = cs->phys + OMAP2_MCSPI_RX0;
 498         cfg.dst_addr = cs->phys + OMAP2_MCSPI_TX0;
 499         cfg.src_addr_width = width;
 500         cfg.dst_addr_width = width;
 501         cfg.src_maxburst = 1;
 502         cfg.dst_maxburst = 1;
 503
 504         rx = xfer->rx_buf;
 505         tx = xfer->tx_buf;
 506
 507         count = xfer->len;
 508
 509         if (tx != NULL)
 510                 omap2_mcspi_tx_dma(spi, xfer, cfg);
 511
 512         if (rx != NULL)
 513                 count = omap2_mcspi_rx_dma(spi, xfer, cfg, es);
 514
 515         if (tx != NULL) {
 516                 chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0;
 517                 wait_for_completion(&mcspi_dma->dma_tx_completion);
 518                 dma_unmap_single(mcspi->dev, xfer->tx_dma, xfer->len,
 519                                  DMA_TO_DEVICE);
 520
 521                 /* for TX_ONLY mode, be sure all words have shifted out */
 522                 if (rx == NULL) {
 523                         if (mcspi_wait_for_reg_bit(chstat_reg,
 524                                                 OMAP2_MCSPI_CHSTAT_TXS) < 0)
 525                                 dev_err(&spi->dev, "TXS timed out\n");
 526                         else if (mcspi_wait_for_reg_bit(chstat_reg,
 527                                                 OMAP2_MCSPI_CHSTAT_EOT) < 0)
 528                                 dev_err(&spi->dev, "EOT timed out\n");
 529                 }
 530         }
 531         return count;
 532 }
 533
 534 static unsigned
 535 omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
 536 {
 537         struct omap2_mcspi      *mcspi;
 538         struct omap2_mcspi_cs   *cs = spi->controller_state;
 539         unsigned int            count, c;
 540         u32                     l;
 541         void __iomem            *base = cs->base;
 542         void __iomem            *tx_reg;
 543         void __iomem            *rx_reg;
 544         void __iomem            *chstat_reg;
 545         int                     word_len;
 546
 547         mcspi = spi_master_get_devdata(spi->master);
 548         count = xfer->len;
 549         c = count;
 550         word_len = cs->word_len;
 551
 552         l = mcspi_cached_chconf0(spi);
 553
 554         /* We store the pre-calculated register addresses on stack to speed
 555          * up the transfer loop. */
 556         tx_reg          = base + OMAP2_MCSPI_TX0;
 557         rx_reg          = base + OMAP2_MCSPI_RX0;
 558         chstat_reg      = base + OMAP2_MCSPI_CHSTAT0;
 559
 560         if (c < (word_len>>3))
 561                 return 0;
 562
 563         if (word_len <= 8) {
 564                 u8              *rx;
 565                 const u8        *tx;
 566
 567                 rx = xfer->rx_buf;
 568                 tx = xfer->tx_buf;
 569
 570                 do {
 571                         c -= 1;
 572                         if (tx != NULL) {
 573                                 if (mcspi_wait_for_reg_bit(chstat_reg,
 574                                                 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
 575                                         dev_err(&spi->dev, "TXS timed out\n");
 576                                         goto out;
 577                                 }
 578                                 dev_vdbg(&spi->dev, "write-%d %02x\n",
 579                                                 word_len, *tx);
 580                                 __raw_writel(*tx++, tx_reg);
 581                         }
 582                         if (rx != NULL) {
 583                                 if (mcspi_wait_for_reg_bit(chstat_reg,
 584                                                 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
 585                                         dev_err(&spi->dev, "RXS timed out\n");
 586                                         goto out;
 587                                 }
 588
 589                                 if (c == 1 && tx == NULL &&
 590                                     (l & OMAP2_MCSPI_CHCONF_TURBO)) {
 591                                         omap2_mcspi_set_enable(spi, 0);
 592                                         *rx++ = __raw_readl(rx_reg);
 593                                         dev_vdbg(&spi->dev, "read-%d %02x\n",
 594                                                     word_len, *(rx - 1));
 595                                         if (mcspi_wait_for_reg_bit(chstat_reg,
 596                                                 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
 597                                                 dev_err(&spi->dev,
 598                                                         "RXS timed out\n");
 599                                                 goto out;
 600                                         }
 601                                         c = 0;
 602                                 } else if (c == 0 && tx == NULL) {
 603                                         omap2_mcspi_set_enable(spi, 0);
 604                                 }
 605
 606                                 *rx++ = __raw_readl(rx_reg);
 607                                 dev_vdbg(&spi->dev, "read-%d %02x\n",
 608                                                 word_len, *(rx - 1));
 609                         }
 610                 } while (c);
 611         } else if (word_len <= 16) {
 612                 u16             *rx;
 613                 const u16       *tx;
 614
 615                 rx = xfer->rx_buf;
 616                 tx = xfer->tx_buf;
 617                 do {
 618                         c -= 2;
 619                         if (tx != NULL) {
 620                                 if (mcspi_wait_for_reg_bit(chstat_reg,
 621                                                 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
 622                                         dev_err(&spi->dev, "TXS timed out\n");
 623                                         goto out;
 624                                 }
 625                                 dev_vdbg(&spi->dev, "write-%d %04x\n",
 626                                                 word_len, *tx);
 627                                 __raw_writel(*tx++, tx_reg);
 628                         }
 629                         if (rx != NULL) {
 630                                 if (mcspi_wait_for_reg_bit(chstat_reg,
 631                                                 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
 632                                         dev_err(&spi->dev, "RXS timed out\n");
 633                                         goto out;
 634                                 }
 635
 636                                 if (c == 2 && tx == NULL &&
 637                                     (l & OMAP2_MCSPI_CHCONF_TURBO)) {
 638                                         omap2_mcspi_set_enable(spi, 0);
 639                                         *rx++ = __raw_readl(rx_reg);
 640                                         dev_vdbg(&spi->dev, "read-%d %04x\n",
 641                                                     word_len, *(rx - 1));
 642                                         if (mcspi_wait_for_reg_bit(chstat_reg,
 643                                                 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
 644                                                 dev_err(&spi->dev,
 645                                                         "RXS timed out\n");
 646                                                 goto out;
 647                                         }
 648                                         c = 0;
 649                                 } else if (c == 0 && tx == NULL) {
 650                                         omap2_mcspi_set_enable(spi, 0);
 651                                 }
 652
 653                                 *rx++ = __raw_readl(rx_reg);
 654                                 dev_vdbg(&spi->dev, "read-%d %04x\n",
 655                                                 word_len, *(rx - 1));
 656                         }
 657                 } while (c >= 2);
 658         } else if (word_len <= 32) {
 659                 u32             *rx;
 660                 const u32       *tx;
 661
 662                 rx = xfer->rx_buf;
 663                 tx = xfer->tx_buf;
 664                 do {
 665                         c -= 4;
 666                         if (tx != NULL) {
 667                                 if (mcspi_wait_for_reg_bit(chstat_reg,
 668                                                 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
 669                                         dev_err(&spi->dev, "TXS timed out\n");
 670                                         goto out;
 671                                 }
 672                                 dev_vdbg(&spi->dev, "write-%d %08x\n",
 673                                                 word_len, *tx);
 674                                 __raw_writel(*tx++, tx_reg);
 675                         }
 676                         if (rx != NULL) {
 677                                 if (mcspi_wait_for_reg_bit(chstat_reg,
 678                                                 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
 679                                         dev_err(&spi->dev, "RXS timed out\n");
 680                                         goto out;
 681                                 }
 682
 683                                 if (c == 4 && tx == NULL &&
 684                                     (l & OMAP2_MCSPI_CHCONF_TURBO)) {
 685                                         omap2_mcspi_set_enable(spi, 0);
 686                                         *rx++ = __raw_readl(rx_reg);
 687                                         dev_vdbg(&spi->dev, "read-%d %08x\n",
 688                                                     word_len, *(rx - 1));
 689                                         if (mcspi_wait_for_reg_bit(chstat_reg,
 690                                                 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
 691                                                 dev_err(&spi->dev,
 692                                                         "RXS timed out\n");
 693                                                 goto out;
 694                                         }
 695                                         c = 0;
 696                                 } else if (c == 0 && tx == NULL) {
 697                                         omap2_mcspi_set_enable(spi, 0);
 698                                 }
 699
 700                                 *rx++ = __raw_readl(rx_reg);
 701                                 dev_vdbg(&spi->dev, "read-%d %08x\n",
 702                                                 word_len, *(rx - 1));
 703                         }
 704                 } while (c >= 4);
 705         }
 706
 707         /* for TX_ONLY mode, be sure all words have shifted out */
 708         if (xfer->rx_buf == NULL) {
 709                 if (mcspi_wait_for_reg_bit(chstat_reg,
 710                                 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
 711                         dev_err(&spi->dev, "TXS timed out\n");
 712                 } else if (mcspi_wait_for_reg_bit(chstat_reg,
 713                                 OMAP2_MCSPI_CHSTAT_EOT) < 0)
 714                         dev_err(&spi->dev, "EOT timed out\n");
 715
 716                 /* disable chan to purge rx datas received in TX_ONLY transfer,
 717                  * otherwise these rx datas will affect the direct following
 718                  * RX_ONLY transfer.
 719                  */
 720                 omap2_mcspi_set_enable(spi, 0);
 721         }
 722 out:
 723         omap2_mcspi_set_enable(spi, 1);
 724         return count - c;
 725 }
 726
 727 static u32 omap2_mcspi_calc_divisor(u32 speed_hz)
 728 {
 729         u32 div;
 730
 731         for (div = 0; div < 15; div++)
 732                 if (speed_hz >= (OMAP2_MCSPI_MAX_FREQ >> div))
 733                         return div;
 734
 735         return 15;
 736 }
 737
 738 /* called only when no transfer is active to this device */
 739 static int omap2_mcspi_setup_transfer(struct spi_device *spi,
 740                 struct spi_transfer *t)
 741 {
 742         struct omap2_mcspi_cs *cs = spi->controller_state;
 743         struct omap2_mcspi *mcspi;
 744         struct spi_master *spi_cntrl;
 745         u32 l = 0, div = 0;
 746         u8 word_len = spi->bits_per_word;
 747         u32 speed_hz = spi->max_speed_hz;
 748
 749         mcspi = spi_master_get_devdata(spi->master);
 750         spi_cntrl = mcspi->master;
 751
 752         if (t != NULL && t->bits_per_word)
 753                 word_len = t->bits_per_word;
 754
 755         cs->word_len = word_len;
 756
 757         if (t && t->speed_hz)
 758                 speed_hz = t->speed_hz;
 759
 760         speed_hz = min_t(u32, speed_hz, OMAP2_MCSPI_MAX_FREQ);
 761         div = omap2_mcspi_calc_divisor(speed_hz);
 762
 763         l = mcspi_cached_chconf0(spi);
 764
 765         /* standard 4-wire master mode:  SCK, MOSI/out, MISO/in, nCS
 766          * REVISIT: this controller could support SPI_3WIRE mode.
 767          */
 768         if (mcspi->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) {
 769                 l &= ~OMAP2_MCSPI_CHCONF_IS;
 770                 l &= ~OMAP2_MCSPI_CHCONF_DPE1;
 771                 l |= OMAP2_MCSPI_CHCONF_DPE0;
 772         } else {
 773                 l |= OMAP2_MCSPI_CHCONF_IS;
 774                 l |= OMAP2_MCSPI_CHCONF_DPE1;
 775                 l &= ~OMAP2_MCSPI_CHCONF_DPE0;
 776         }
 777
 778         /* wordlength */
 779         l &= ~OMAP2_MCSPI_CHCONF_WL_MASK;
 780         l |= (word_len - 1) << 7;
 781
 782         /* set chipselect polarity; manage with FORCE */
 783         if (!(spi->mode & SPI_CS_HIGH))
 784                 l |= OMAP2_MCSPI_CHCONF_EPOL;   /* active-low; normal */
 785         else
 786                 l &= ~OMAP2_MCSPI_CHCONF_EPOL;
 787
 788         /* set clock divisor */
 789         l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK;
 790         l |= div << 2;
 791
 792         /* set SPI mode 0..3 */
 793         if (spi->mode & SPI_CPOL)
 794                 l |= OMAP2_MCSPI_CHCONF_POL;
 795         else
 796                 l &= ~OMAP2_MCSPI_CHCONF_POL;
 797         if (spi->mode & SPI_CPHA)
 798                 l |= OMAP2_MCSPI_CHCONF_PHA;
 799         else
 800                 l &= ~OMAP2_MCSPI_CHCONF_PHA;
 801
 802         mcspi_write_chconf0(spi, l);
 803
 804         dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n",
 805                         OMAP2_MCSPI_MAX_FREQ >> div,
 806                         (spi->mode & SPI_CPHA) ? "trailing" : "leading",
 807                         (spi->mode & SPI_CPOL) ? "inverted" : "normal");
 808
 809         return 0;
 810 }
 811
 812 static int omap2_mcspi_request_dma(struct spi_device *spi)
 813 {
 814         struct spi_master       *master = spi->master;
 815         struct omap2_mcspi      *mcspi;
 816         struct omap2_mcspi_dma  *mcspi_dma;
 817         dma_cap_mask_t mask;
 818         unsigned sig;
 819
 820         mcspi = spi_master_get_devdata(master);
 821         mcspi_dma = mcspi->dma_channels + spi->chip_select;
 822
 823         init_completion(&mcspi_dma->dma_rx_completion);
 824         init_completion(&mcspi_dma->dma_tx_completion);
 825
 826         dma_cap_zero(mask);
 827         dma_cap_set(DMA_SLAVE, mask);
 828         sig = mcspi_dma->dma_rx_sync_dev;
 829         mcspi_dma->dma_rx = dma_request_channel(mask, omap_dma_filter_fn, &sig);
 830         if (!mcspi_dma->dma_rx) {
 831                 dev_err(&spi->dev, "no RX DMA engine channel for McSPI\n");
 832                 return -EAGAIN;
 833         }
 834
 835         sig = mcspi_dma->dma_tx_sync_dev;
 836         mcspi_dma->dma_tx = dma_request_channel(mask, omap_dma_filter_fn, &sig);
 837         if (!mcspi_dma->dma_tx) {
 838                 dev_err(&spi->dev, "no TX DMA engine channel for McSPI\n");
 839                 dma_release_channel(mcspi_dma->dma_rx);
 840                 mcspi_dma->dma_rx = NULL;
 841                 return -EAGAIN;
 842         }
 843
 844         return 0;
 845 }
 846
 847 static int omap2_mcspi_setup(struct spi_device *spi)
 848 {
 849         int                     ret;
 850         struct omap2_mcspi      *mcspi = spi_master_get_devdata(spi->master);
 851         struct omap2_mcspi_regs *ctx = &mcspi->ctx;
 852         struct omap2_mcspi_dma  *mcspi_dma;
 853         struct omap2_mcspi_cs   *cs = spi->controller_state;
 854
 855         if (spi->bits_per_word < 4 || spi->bits_per_word > 32) {
 856                 dev_dbg(&spi->dev, "setup: unsupported %d bit words\n",
 857                         spi->bits_per_word);
 858                 return -EINVAL;
 859         }
 860
 861         mcspi_dma = &mcspi->dma_channels[spi->chip_select];
 862
 863         if (!cs) {
 864                 cs = kzalloc(sizeof *cs, GFP_KERNEL);
 865                 if (!cs)
 866                         return -ENOMEM;
 867                 cs->base = mcspi->base + spi->chip_select * 0x14;
 868                 cs->phys = mcspi->phys + spi->chip_select * 0x14;
 869                 cs->chconf0 = 0;
 870                 spi->controller_state = cs;
 871                 /* Link this to context save list */
 872                 list_add_tail(&cs->node, &ctx->cs);
 873         }
 874
 875         if (!mcspi_dma->dma_rx || !mcspi_dma->dma_tx) {
 876                 ret = omap2_mcspi_request_dma(spi);
 877                 if (ret < 0)
 878                         return ret;
 879         }
 880
 881         ret = pm_runtime_get_sync(mcspi->dev);
 882         if (ret < 0)
 883                 return ret;
 884
 885         ret = omap2_mcspi_setup_transfer(spi, NULL);
 886         pm_runtime_mark_last_busy(mcspi->dev);
 887         pm_runtime_put_autosuspend(mcspi->dev);
 888
 889         return ret;
 890 }
 891
 892 static void omap2_mcspi_cleanup(struct spi_device *spi)
 893 {
 894         struct omap2_mcspi      *mcspi;
 895         struct omap2_mcspi_dma  *mcspi_dma;
 896         struct omap2_mcspi_cs   *cs;
 897
 898         mcspi = spi_master_get_devdata(spi->master);
 899
 900         if (spi->controller_state) {
 901                 /* Unlink controller state from context save list */
 902                 cs = spi->controller_state;
 903                 list_del(&cs->node);
 904
 905                 kfree(cs);
 906         }
 907
 908         if (spi->chip_select < spi->master->num_chipselect) {
 909                 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
 910
 911                 if (mcspi_dma->dma_rx) {
 912                         dma_release_channel(mcspi_dma->dma_rx);
 913                         mcspi_dma->dma_rx = NULL;
 914                 }
 915                 if (mcspi_dma->dma_tx) {
 916                         dma_release_channel(mcspi_dma->dma_tx);
 917                         mcspi_dma->dma_tx = NULL;
 918                 }
 919         }
 920 }
 921
 922 static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
 923 {
 924
 925         /* We only enable one channel at a time -- the one whose message is
 926          * -- although this controller would gladly
 927          * arbitrate among multiple channels.  This corresponds to "single
 928          * channel" master mode.  As a side effect, we need to manage the
 929          * chipselect with the FORCE bit ... CS != channel enable.
 930          */
 931
 932         struct spi_device               *spi;
 933         struct spi_transfer             *t = NULL;
 934         struct spi_master               *master;
 935         int                             cs_active = 0;
 936         struct omap2_mcspi_cs           *cs;
 937         struct omap2_mcspi_device_config *cd;
 938         int                             par_override = 0;
 939         int                             status = 0;
 940         u32                             chconf;
 941
 942         spi = m->spi;
 943         master = spi->master;
 944         cs = spi->controller_state;
 945         cd = spi->controller_data;
 946
 947         omap2_mcspi_set_enable(spi, 1);
 948         list_for_each_entry(t, &m->transfers, transfer_list) {
 949                 if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
 950                         status = -EINVAL;
 951                         break;
 952                 }
 953                 if (par_override || t->speed_hz || t->bits_per_word) {
 954                         par_override = 1;
 955                         status = omap2_mcspi_setup_transfer(spi, t);
 956                         if (status < 0)
 957                                 break;
 958                         if (!t->speed_hz && !t->bits_per_word)
 959                                 par_override = 0;
 960                 }
 961                 if (cd && cd->cs_per_word) {
 962                         chconf = mcspi->ctx.modulctrl;
 963                         chconf &= ~OMAP2_MCSPI_MODULCTRL_SINGLE;
 964                         mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf);
 965                         mcspi->ctx.modulctrl =
 966                                 mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL);
 967                 }
 968
 969
 970                 if (!cs_active) {
 971                         omap2_mcspi_force_cs(spi, 1);
 972                         cs_active = 1;
 973                 }
 974
 975                 chconf = mcspi_cached_chconf0(spi);
 976                 chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
 977                 chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
 978
 979                 if (t->tx_buf == NULL)
 980                         chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
 981                 else if (t->rx_buf == NULL)
 982                         chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
 983
 984                 if (cd && cd->turbo_mode && t->tx_buf == NULL) {
 985                         /* Turbo mode is for more than one word */
 986                         if (t->len > ((cs->word_len + 7) >> 3))
 987                                 chconf |= OMAP2_MCSPI_CHCONF_TURBO;
 988                 }
 989
 990                 mcspi_write_chconf0(spi, chconf);
 991
 992                 if (t->len) {
 993                         unsigned        count;
 994
 995                         /* RX_ONLY mode needs dummy data in TX reg */
 996                         if (t->tx_buf == NULL)
 997                                 __raw_writel(0, cs->base
 998                                                 + OMAP2_MCSPI_TX0);
 999
1000                         if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
1001                                 count = omap2_mcspi_txrx_dma(spi, t);
1002                         else
1003                                 count = omap2_mcspi_txrx_pio(spi, t);
1004                         m->actual_length += count;
1005
1006                         if (count != t->len) {
1007                                 status = -EIO;
1008                                 break;
1009                         }
1010                 }
1011
1012                 if (t->delay_usecs)
1013                         udelay(t->delay_usecs);
1014
1015                 /* ignore the "leave it on after last xfer" hint */
1016                 if (t->cs_change) {
1017                         omap2_mcspi_force_cs(spi, 0);
1018                         cs_active = 0;
1019                 }
1020         }
1021         /* Restore defaults if they were overriden */
1022         if (par_override) {
1023                 par_override = 0;
1024                 status = omap2_mcspi_setup_transfer(spi, NULL);
1025         }
1026
1027         if (cs_active)
1028                 omap2_mcspi_force_cs(spi, 0);
1029
1030         if (cd && cd->cs_per_word) {
1031                 chconf = mcspi->ctx.modulctrl;
1032                 chconf |= OMAP2_MCSPI_MODULCTRL_SINGLE;
1033                 mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf);
1034                 mcspi->ctx.modulctrl =
1035                         mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL);
1036         }
1037
1038         omap2_mcspi_set_enable(spi, 0);
1039
1040         m->status = status;
1041
1042 }
1043
1044 static int omap2_mcspi_transfer_one_message(struct spi_master *master,
1045                 struct spi_message *m)
1046 {
1047         struct omap2_mcspi      *mcspi;
1048         struct spi_transfer     *t;
1049
1050         mcspi = spi_master_get_devdata(master);
1051         m->actual_length = 0;
1052         m->status = 0;
1053
1054         /* reject invalid messages and transfers */
1055         if (list_empty(&m->transfers))
1056                 return -EINVAL;
1057         list_for_each_entry(t, &m->transfers, transfer_list) {
1058                 const void      *tx_buf = t->tx_buf;
1059                 void            *rx_buf = t->rx_buf;
1060                 unsigned        len = t->len;
1061
1062                 if (t->speed_hz > OMAP2_MCSPI_MAX_FREQ
1063                                 || (len && !(rx_buf || tx_buf))
1064                                 || (t->bits_per_word &&
1065                                         (  t->bits_per_word < 4
1066                                            || t->bits_per_word > 32))) {
1067                         dev_dbg(mcspi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
1068                                         t->speed_hz,
1069                                         len,
1070                                         tx_buf ? "tx" : "",
1071                                         rx_buf ? "rx" : "",
1072                                         t->bits_per_word);
1073                         return -EINVAL;
1074                 }
1075                 if (t->speed_hz && t->speed_hz < (OMAP2_MCSPI_MAX_FREQ >> 15)) {
1076                         dev_dbg(mcspi->dev, "speed_hz %d below minimum %d Hz\n",
1077                                         t->speed_hz,
1078                                         OMAP2_MCSPI_MAX_FREQ >> 15);
1079                         return -EINVAL;
1080                 }
1081
1082                 if (m->is_dma_mapped || len < DMA_MIN_BYTES)
1083                         continue;
1084
1085                 if (tx_buf != NULL) {
1086                         t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
1087                                         len, DMA_TO_DEVICE);
1088                         if (dma_mapping_error(mcspi->dev, t->tx_dma)) {
1089                                 dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
1090                                                 'T', len);
1091                                 return -EINVAL;
1092                         }
1093                 }
1094                 if (rx_buf != NULL) {
1095                         t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len,
1096                                         DMA_FROM_DEVICE);
1097                         if (dma_mapping_error(mcspi->dev, t->rx_dma)) {
1098                                 dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
1099                                                 'R', len);
1100                                 if (tx_buf != NULL)
1101                                         dma_unmap_single(mcspi->dev, t->tx_dma,
1102                                                         len, DMA_TO_DEVICE);
1103                                 return -EINVAL;
1104                         }
1105                 }
1106         }
1107
1108         omap2_mcspi_work(mcspi, m);
1109         spi_finalize_current_message(master);
1110         return 0;
1111 }
1112
1113 static int omap2_mcspi_master_setup(struct omap2_mcspi *mcspi)
1114 {
1115         struct spi_master       *master = mcspi->master;
1116         struct omap2_mcspi_regs *ctx = &mcspi->ctx;
1117         int                     ret = 0;
1118
1119         ret = pm_runtime_get_sync(mcspi->dev);
1120         if (ret < 0)
1121                 return ret;
1122
1123         mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE,
1124                         OMAP2_MCSPI_WAKEUPENABLE_WKEN);
1125         ctx->wakeupenable = OMAP2_MCSPI_WAKEUPENABLE_WKEN;
1126
1127         omap2_mcspi_set_master_mode(master);
1128         pm_runtime_mark_last_busy(mcspi->dev);
1129         pm_runtime_put_autosuspend(mcspi->dev);
1130         return 0;
1131 }
1132
1133 static int omap_mcspi_runtime_resume(struct device *dev)
1134 {
1135         struct omap2_mcspi      *mcspi;
1136         struct spi_master       *master;
1137
1138         master = dev_get_drvdata(dev);
1139         mcspi = spi_master_get_devdata(master);
1140         omap2_mcspi_restore_ctx(mcspi);
1141
1142         return 0;
1143 }
1144
1145 static struct omap2_mcspi_platform_config omap2_pdata = {
1146         .regs_offset = 0,
1147 };
1148
1149 static struct omap2_mcspi_platform_config omap4_pdata = {
1150         .regs_offset = OMAP4_MCSPI_REG_OFFSET,
1151 };
1152
1153 static const struct of_device_id omap_mcspi_of_match[] = {
1154         {
1155                 .compatible = "ti,omap2-mcspi",
1156                 .data = &omap2_pdata,
1157         },
1158         {
1159                 .compatible = "ti,omap4-mcspi",
1160                 .data = &omap4_pdata,
1161         },
1162         { },
1163 };
1164 MODULE_DEVICE_TABLE(of, omap_mcspi_of_match);
1165
1166 static int omap2_mcspi_probe(struct platform_device *pdev)
1167 {
1168         struct spi_master       *master;
1169         const struct omap2_mcspi_platform_config *pdata;
1170         struct omap2_mcspi      *mcspi;
1171         struct resource         *r;
1172         int                     status = 0, i;
1173         u32                     regs_offset = 0;
1174         static int              bus_num = 1;
1175         struct device_node      *node = pdev->dev.of_node;
1176         const struct of_device_id *match;
1177         struct pinctrl *pinctrl;
1178
1179         master = spi_alloc_master(&pdev->dev, sizeof *mcspi);
1180         if (master == NULL) {
1181                 dev_dbg(&pdev->dev, "master allocation failed\n");
1182                 return -ENOMEM;
1183         }
1184
1185         /* the spi->mode bits understood by this driver: */
1186         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1187
1188         master->setup = omap2_mcspi_setup;
1189         master->prepare_transfer_hardware = omap2_prepare_transfer;
1190         master->unprepare_transfer_hardware = omap2_unprepare_transfer;
1191         master->transfer_one_message = omap2_mcspi_transfer_one_message;
1192         master->cleanup = omap2_mcspi_cleanup;
1193         master->dev.of_node = node;
1194
1195         dev_set_drvdata(&pdev->dev, master);
1196
1197         mcspi = spi_master_get_devdata(master);
1198         mcspi->master = master;
1199
1200         match = of_match_device(omap_mcspi_of_match, &pdev->dev);
1201         if (match) {
1202                 u32 num_cs = 1; /* default number of chipselect */
1203                 pdata = match->data;
1204
1205                 of_property_read_u32(node, "ti,spi-num-cs", &num_cs);
1206                 master->num_chipselect = num_cs;
1207                 master->bus_num = bus_num++;
1208                 if (of_get_property(node, "ti,pindir-d0-out-d1-in", NULL))
1209                         mcspi->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN;
1210         } else {
1211                 pdata = pdev->dev.platform_data;
1212                 master->num_chipselect = pdata->num_cs;
1213                 if (pdev->id != -1)
1214                         master->bus_num = pdev->id;
1215                 mcspi->pin_dir = pdata->pin_dir;
1216         }
1217         regs_offset = pdata->regs_offset;
1218
1219         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1220         if (r == NULL) {
1221                 status = -ENODEV;
1222                 goto free_master;
1223         }
1224
1225         r->start += regs_offset;
1226         r->end += regs_offset;
1227         mcspi->phys = r->start;
1228
1229         mcspi->base = devm_ioremap_resource(&pdev->dev, r);
1230         if (IS_ERR(mcspi->base)) {
1231                 status = PTR_ERR(mcspi->base);
1232                 goto free_master;
1233         }
1234
1235         mcspi->dev = &pdev->dev;
1236
1237         INIT_LIST_HEAD(&mcspi->ctx.cs);
1238
1239         mcspi->dma_channels = kcalloc(master->num_chipselect,
1240                         sizeof(struct omap2_mcspi_dma),
1241                         GFP_KERNEL);
1242
1243         if (mcspi->dma_channels == NULL)
1244                 goto free_master;
1245
1246         for (i = 0; i < master->num_chipselect; i++) {
1247                 char dma_ch_name[14];
1248                 struct resource *dma_res;
1249
1250                 sprintf(dma_ch_name, "rx%d", i);
1251                 dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA,
1252                                 dma_ch_name);
1253                 if (!dma_res) {
1254                         dev_dbg(&pdev->dev, "cannot get DMA RX channel\n");
1255                         status = -ENODEV;
1256                         break;
1257                 }
1258
1259                 mcspi->dma_channels[i].dma_rx_sync_dev = dma_res->start;
1260                 sprintf(dma_ch_name, "tx%d", i);
1261                 dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA,
1262                                 dma_ch_name);
1263                 if (!dma_res) {
1264                         dev_dbg(&pdev->dev, "cannot get DMA TX channel\n");
1265                         status = -ENODEV;
1266                         break;
1267                 }
1268
1269                 mcspi->dma_channels[i].dma_tx_sync_dev = dma_res->start;
1270         }
1271
1272         if (status < 0)
1273                 goto dma_chnl_free;
1274
1275         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
1276         if (IS_ERR(pinctrl))
1277                 dev_warn(&pdev->dev,
1278                                 "pins are not configured from the driver\n");
1279
1280         pm_runtime_use_autosuspend(&pdev->dev);
1281         pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
1282         pm_runtime_enable(&pdev->dev);
1283
1284         if (status || omap2_mcspi_master_setup(mcspi) < 0)
1285                 goto disable_pm;
1286
1287         status = spi_register_master(master);
1288         if (status < 0)
1289                 goto disable_pm;
1290
1291         return status;
1292
1293 disable_pm:
1294         pm_runtime_disable(&pdev->dev);
1295 dma_chnl_free:
1296         kfree(mcspi->dma_channels);
1297 free_master:
1298         spi_master_put(master);
1299         return status;
1300 }
1301
1302 static int omap2_mcspi_remove(struct platform_device *pdev)
1303 {
1304         struct spi_master       *master;
1305         struct omap2_mcspi      *mcspi;
1306         struct omap2_mcspi_dma  *dma_channels;
1307
1308         master = dev_get_drvdata(&pdev->dev);
1309         mcspi = spi_master_get_devdata(master);
1310         dma_channels = mcspi->dma_channels;
1311
1312         pm_runtime_put_sync(mcspi->dev);
1313         pm_runtime_disable(&pdev->dev);
1314
1315         spi_unregister_master(master);
1316         kfree(dma_channels);
1317
1318         return 0;
1319 }
1320
1321 /* work with hotplug and coldplug */
1322 MODULE_ALIAS("platform:omap2_mcspi");
1323
1324 #ifdef  CONFIG_SUSPEND
1325 /*
1326  * When SPI wake up from off-mode, CS is in activate state. If it was in
1327  * unactive state when driver was suspend, then force it to unactive state at
1328  * wake up.
1329  */
1330 static int omap2_mcspi_resume(struct device *dev)
1331 {
1332         struct spi_master       *master = dev_get_drvdata(dev);
1333         struct omap2_mcspi      *mcspi = spi_master_get_devdata(master);
1334         struct omap2_mcspi_regs *ctx = &mcspi->ctx;
1335         struct omap2_mcspi_cs   *cs;
1336
1337         pm_runtime_get_sync(mcspi->dev);
1338         list_for_each_entry(cs, &ctx->cs, node) {
1339                 if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) {
1340                         /*
1341                          * We need to toggle CS state for OMAP take this
1342                          * change in account.
1343                          */
1344                         cs->chconf0 |= OMAP2_MCSPI_CHCONF_FORCE;
1345                         __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
1346                         cs->chconf0 &= ~OMAP2_MCSPI_CHCONF_FORCE;
1347                         __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
1348                 }
1349         }
1350         pm_runtime_mark_last_busy(mcspi->dev);
1351         pm_runtime_put_autosuspend(mcspi->dev);
1352         return 0;
1353 }
1354 #else
1355 #define omap2_mcspi_resume      NULL
1356 #endif
1357
1358 static const struct dev_pm_ops omap2_mcspi_pm_ops = {
1359         .resume = omap2_mcspi_resume,
1360         .runtime_resume = omap_mcspi_runtime_resume,
1361 };
1362
1363 static struct platform_driver omap2_mcspi_driver = {
1364         .driver = {
1365                 .name =         "omap2_mcspi",
1366                 .owner =        THIS_MODULE,
1367                 .pm =           &omap2_mcspi_pm_ops,
1368                 .of_match_table = omap_mcspi_of_match,
1369         },
1370         .probe =        omap2_mcspi_probe,
1371         .remove =       omap2_mcspi_remove,
1372 };
1373
1374 module_platform_driver(omap2_mcspi_driver);
1375 MODULE_LICENSE("GPL");