drivers/spi/spi-uclass.c

   1 /*
   2  * Copyright (c) 2014 Google, Inc
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <errno.h>
  10 #include <malloc.h>
  11 #include <spi.h>
  12 #include <dm/device-internal.h>
  13 #include <dm/uclass-internal.h>
  14 #include <dm/lists.h>
  15 #include <dm/util.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 static int spi_set_speed_mode(struct udevice *bus, int speed, int mode)
  20 {
  21         struct dm_spi_ops *ops;
  22         int ret;
  23
  24         ops = spi_get_ops(bus);
  25         if (ops->set_speed)
  26                 ret = ops->set_speed(bus, speed);
  27         else
  28                 ret = -EINVAL;
  29         if (ret) {
  30                 printf("Cannot set speed (err=%d)\n", ret);
  31                 return ret;
  32         }
  33
  34         if (ops->set_mode)
  35                 ret = ops->set_mode(bus, mode);
  36         else
  37                 ret = -EINVAL;
  38         if (ret) {
  39                 printf("Cannot set mode (err=%d)\n", ret);
  40                 return ret;
  41         }
  42
  43         return 0;
  44 }
  45
  46 int dm_spi_claim_bus(struct udevice *dev)
  47 {
  48         struct udevice *bus = dev->parent;
  49         struct dm_spi_ops *ops = spi_get_ops(bus);
  50         struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
  51         struct spi_slave *slave = dev_get_parent_priv(dev);
  52         int speed;
  53
  54         speed = slave->max_hz;
  55         if (spi->max_hz) {
  56                 if (speed)
  57                         speed = min(speed, (int)spi->max_hz);
  58                 else
  59                         speed = spi->max_hz;
  60         }
  61         if (!speed)
  62                 speed = 100000;
  63         if (speed != slave->speed) {
  64                 int ret = spi_set_speed_mode(bus, speed, slave->mode);
  65
  66                 if (ret)
  67                         return ret;
  68                 slave->speed = speed;
  69         }
  70
  71         return ops->claim_bus ? ops->claim_bus(dev) : 0;
  72 }
  73
  74 void dm_spi_release_bus(struct udevice *dev)
  75 {
  76         struct udevice *bus = dev->parent;
  77         struct dm_spi_ops *ops = spi_get_ops(bus);
  78
  79         if (ops->release_bus)
  80                 ops->release_bus(dev);
  81 }
  82
  83 int dm_spi_xfer(struct udevice *dev, unsigned int bitlen,
  84                 const void *dout, void *din, unsigned long flags)
  85 {
  86         struct udevice *bus = dev->parent;
  87
  88         if (bus->uclass->uc_drv->id != UCLASS_SPI)
  89                 return -EOPNOTSUPP;
  90
  91         return spi_get_ops(bus)->xfer(dev, bitlen, dout, din, flags);
  92 }
  93
  94 int spi_claim_bus(struct spi_slave *slave)
  95 {
  96         return dm_spi_claim_bus(slave->dev);
  97 }
  98
  99 void spi_release_bus(struct spi_slave *slave)
 100 {
 101         dm_spi_release_bus(slave->dev);
 102 }
 103
 104 int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 105              const void *dout, void *din, unsigned long flags)
 106 {
 107         return dm_spi_xfer(slave->dev, bitlen, dout, din, flags);
 108 }
 109
 110 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
 111 static int spi_child_post_bind(struct udevice *dev)
 112 {
 113         struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
 114
 115         if (!dev_of_valid(dev))
 116                 return 0;
 117
 118         return spi_slave_ofdata_to_platdata(dev, plat);
 119 }
 120 #endif
 121
 122 static int spi_post_probe(struct udevice *bus)
 123 {
 124 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
 125         struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
 126
 127         spi->max_hz = dev_read_u32_default(bus, "spi-max-frequency", 0);
 128 #endif
 129 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 130         struct dm_spi_ops *ops = spi_get_ops(bus);
 131
 132         if (ops->claim_bus)
 133                 ops->claim_bus += gd->reloc_off;
 134         if (ops->release_bus)
 135                 ops->release_bus += gd->reloc_off;
 136         if (ops->set_wordlen)
 137                 ops->set_wordlen += gd->reloc_off;
 138         if (ops->xfer)
 139                 ops->xfer += gd->reloc_off;
 140         if (ops->set_speed)
 141                 ops->set_speed += gd->reloc_off;
 142         if (ops->set_mode)
 143                 ops->set_mode += gd->reloc_off;
 144         if (ops->cs_info)
 145                 ops->cs_info += gd->reloc_off;
 146 #endif
 147
 148         return 0;
 149 }
 150
 151 static int spi_child_pre_probe(struct udevice *dev)
 152 {
 153         struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
 154         struct spi_slave *slave = dev_get_parent_priv(dev);
 155
 156         /*
 157          * This is needed because we pass struct spi_slave around the place
 158          * instead slave->dev (a struct udevice). So we have to have some
 159          * way to access the slave udevice given struct spi_slave. Once we
 160          * change the SPI API to use udevice instead of spi_slave, we can
 161          * drop this.
 162          */
 163         slave->dev = dev;
 164
 165         slave->max_hz = plat->max_hz;
 166         slave->mode = plat->mode;
 167         slave->wordlen = SPI_DEFAULT_WORDLEN;
 168
 169         return 0;
 170 }
 171
 172 int spi_chip_select(struct udevice *dev)
 173 {
 174         struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
 175
 176         return plat ? plat->cs : -ENOENT;
 177 }
 178
 179 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
 180 {
 181         struct udevice *dev;
 182
 183         for (device_find_first_child(bus, &dev); dev;
 184              device_find_next_child(&dev)) {
 185                 struct dm_spi_slave_platdata *plat;
 186
 187                 plat = dev_get_parent_platdata(dev);
 188                 debug("%s: plat=%p, cs=%d\n", __func__, plat, plat->cs);
 189                 if (plat->cs == cs) {
 190                         *devp = dev;
 191                         return 0;
 192                 }
 193         }
 194
 195         return -ENODEV;
 196 }
 197
 198 int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
 199 {
 200         struct spi_cs_info info;
 201         struct udevice *bus;
 202         int ret;
 203
 204         ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
 205         if (ret) {
 206                 debug("%s: No bus %d\n", __func__, busnum);
 207                 return ret;
 208         }
 209
 210         return spi_cs_info(bus, cs, &info);
 211 }
 212
 213 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
 214 {
 215         struct spi_cs_info local_info;
 216         struct dm_spi_ops *ops;
 217         int ret;
 218
 219         if (!info)
 220                 info = &local_info;
 221
 222         /* If there is a device attached, return it */
 223         info->dev = NULL;
 224         ret = spi_find_chip_select(bus, cs, &info->dev);
 225         if (!ret)
 226                 return 0;
 227
 228         /*
 229          * Otherwise ask the driver. For the moment we don't have CS info.
 230          * When we do we could provide the driver with a helper function
 231          * to figure out what chip selects are valid, or just handle the
 232          * request.
 233          */
 234         ops = spi_get_ops(bus);
 235         if (ops->cs_info)
 236                 return ops->cs_info(bus, cs, info);
 237
 238         /*
 239          * We could assume there is at least one valid chip select, but best
 240          * to be sure and return an error in this case. The driver didn't
 241          * care enough to tell us.
 242          */
 243         return -ENODEV;
 244 }
 245
 246 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
 247                         struct udevice **devp)
 248 {
 249         struct udevice *bus, *dev;
 250         int ret;
 251
 252         ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
 253         if (ret) {
 254                 debug("%s: No bus %d\n", __func__, busnum);
 255                 return ret;
 256         }
 257         ret = spi_find_chip_select(bus, cs, &dev);
 258         if (ret) {
 259                 debug("%s: No cs %d\n", __func__, cs);
 260                 return ret;
 261         }
 262         *busp = bus;
 263         *devp = dev;
 264
 265         return ret;
 266 }
 267
 268 int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
 269                        const char *drv_name, const char *dev_name,
 270                        struct udevice **busp, struct spi_slave **devp)
 271 {
 272         struct udevice *bus, *dev;
 273         struct dm_spi_slave_platdata *plat;
 274         bool created = false;
 275         int ret;
 276
 277 #if CONFIG_IS_ENABLED(OF_PLATDATA)
 278         ret = uclass_first_device_err(UCLASS_SPI, &bus);
 279 #else
 280         ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
 281 #endif
 282         if (ret) {
 283                 printf("Invalid bus %d (err=%d)\n", busnum, ret);
 284                 return ret;
 285         }
 286         ret = spi_find_chip_select(bus, cs, &dev);
 287
 288         /*
 289          * If there is no such device, create one automatically. This means
 290          * that we don't need a device tree node or platform data for the
 291          * SPI flash chip - we will bind to the correct driver.
 292          */
 293         if (ret == -ENODEV && drv_name) {
 294                 debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
 295                       __func__, dev_name, busnum, cs, drv_name);
 296                 ret = device_bind_driver(bus, drv_name, dev_name, &dev);
 297                 if (ret) {
 298                         debug("%s: Unable to bind driver (ret=%d)\n", __func__,
 299                               ret);
 300                         return ret;
 301                 }
 302                 plat = dev_get_parent_platdata(dev);
 303                 plat->cs = cs;
 304                 plat->max_hz = speed;
 305                 plat->mode = mode;
 306                 created = true;
 307         } else if (ret) {
 308                 printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
 309                        ret);
 310                 return ret;
 311         }
 312
 313         if (!device_active(dev)) {
 314                 struct spi_slave *slave;
 315
 316                 ret = device_probe(dev);
 317                 if (ret)
 318                         goto err;
 319                 slave = dev_get_parent_priv(dev);
 320                 slave->dev = dev;
 321         }
 322
 323         plat = dev_get_parent_platdata(dev);
 324         if (!speed) {
 325                 speed = plat->max_hz;
 326                 mode = plat->mode;
 327         }
 328         ret = spi_set_speed_mode(bus, speed, mode);
 329         if (ret)
 330                 goto err;
 331
 332         *busp = bus;
 333         *devp = dev_get_parent_priv(dev);
 334         debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
 335
 336         return 0;
 337
 338 err:
 339         debug("%s: Error path, created=%d, device '%s'\n", __func__,
 340               created, dev->name);
 341         if (created) {
 342                 device_remove(dev, DM_REMOVE_NORMAL);
 343                 device_unbind(dev);
 344         }
 345
 346         return ret;
 347 }
 348
 349 /* Compatibility function - to be removed */
 350 struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
 351                                   unsigned int speed, unsigned int mode)
 352 {
 353         struct spi_slave *slave;
 354         struct udevice *dev;
 355         int ret;
 356
 357         ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
 358                                  &slave);
 359         if (ret)
 360                 return NULL;
 361
 362         return slave;
 363 }
 364
 365 void spi_free_slave(struct spi_slave *slave)
 366 {
 367         device_remove(slave->dev, DM_REMOVE_NORMAL);
 368         slave->dev = NULL;
 369 }
 370
 371 int spi_slave_ofdata_to_platdata(struct udevice *dev,
 372                                  struct dm_spi_slave_platdata *plat)
 373 {
 374         int mode = 0;
 375         int value;
 376
 377         plat->cs = dev_read_u32_default(dev, "reg", -1);
 378         plat->max_hz = dev_read_u32_default(dev, "spi-max-frequency", 0);
 379         if (dev_read_bool(dev, "spi-cpol"))
 380                 mode |= SPI_CPOL;
 381         if (dev_read_bool(dev, "spi-cpha"))
 382                 mode |= SPI_CPHA;
 383         if (dev_read_bool(dev, "spi-cs-high"))
 384                 mode |= SPI_CS_HIGH;
 385         if (dev_read_bool(dev, "spi-3wire"))
 386                 mode |= SPI_3WIRE;
 387         if (dev_read_bool(dev, "spi-half-duplex"))
 388                 mode |= SPI_PREAMBLE;
 389
 390         /* Device DUAL/QUAD mode */
 391         value = dev_read_u32_default(dev, "spi-tx-bus-width", 1);
 392         switch (value) {
 393         case 1:
 394                 break;
 395         case 2:
 396                 mode |= SPI_TX_DUAL;
 397                 break;
 398         case 4:
 399                 mode |= SPI_TX_QUAD;
 400                 break;
 401         default:
 402                 warn_non_spl("spi-tx-bus-width %d not supported\n", value);
 403                 break;
 404         }
 405
 406         value = dev_read_u32_default(dev, "spi-rx-bus-width", 1);
 407         switch (value) {
 408         case 1:
 409                 break;
 410         case 2:
 411                 mode |= SPI_RX_DUAL;
 412                 break;
 413         case 4:
 414                 mode |= SPI_RX_QUAD;
 415                 break;
 416         default:
 417                 warn_non_spl("spi-rx-bus-width %d not supported\n", value);
 418                 break;
 419         }
 420
 421         plat->mode = mode;
 422
 423         return 0;
 424 }
 425
 426 UCLASS_DRIVER(spi) = {
 427         .id             = UCLASS_SPI,
 428         .name           = "spi",
 429         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 430 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
 431         .post_bind      = dm_scan_fdt_dev,
 432 #endif
 433         .post_probe     = spi_post_probe,
 434         .child_pre_probe = spi_child_pre_probe,
 435         .per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
 436         .per_child_auto_alloc_size = sizeof(struct spi_slave),
 437         .per_child_platdata_auto_alloc_size =
 438                         sizeof(struct dm_spi_slave_platdata),
 439 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
 440         .child_post_bind = spi_child_post_bind,
 441 #endif
 442 };
 443
 444 UCLASS_DRIVER(spi_generic) = {
 445         .id             = UCLASS_SPI_GENERIC,
 446         .name           = "spi_generic",
 447 };
 448
 449 U_BOOT_DRIVER(spi_generic_drv) = {
 450         .name           = "spi_generic_drv",
 451         .id             = UCLASS_SPI_GENERIC,
 452 };