drivers/mfd/sta2x11-mfd.c

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This source file includes following definitions.
__reg_within_range
sta2x11_mfd_find
sta2x11_mfd_add
__sta2x11_mfd_mask
sta2x11_mfd_get_regs_data
sta2x11_regmap_lock
sta2x11_regmap_unlock
sta2x11_regmap_nolock
sta2x11_sctl_writeable_reg
sta2x11_scr_readable_reg
sta2x11_scr_writeable_reg
sta2x11_apbreg_readable_reg
sta2x11_apbreg_writeable_reg
sta2x11_apb_soc_regs_readable_reg
sta2x11_apb_soc_regs_writeable_reg
sta2x11_mfd_platform_probe
sta2x11_sctl_probe
sta2x11_apbreg_probe
sta2x11_apb_soc_regs_probe
sta2x11_scr_probe
sta2x11_drivers_init
sta2x11_mfd_suspend
sta2x11_mfd_resume
sta2x11_mfd_setup
sta2x11_mfd_probe
sta2x11_mfd_init
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * STA2x11 mfd for GPIO, SCTL and APBREG
   4  *
   5  * Copyright (c) 2009-2011 Wind River Systems, Inc.
   6  * Copyright (c) 2011 ST Microelectronics (Alessandro Rubini, Davide Ciminaghi)
   7  */
   8 
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/export.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/errno.h>
  14 #include <linux/device.h>
  15 #include <linux/slab.h>
  16 #include <linux/list.h>
  17 #include <linux/io.h>
  18 #include <linux/ioport.h>
  19 #include <linux/pci.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/mfd/core.h>
  23 #include <linux/mfd/sta2x11-mfd.h>
  24 #include <linux/regmap.h>
  25 
  26 #include <asm/sta2x11.h>
  27 
  28 static inline int __reg_within_range(unsigned int r,
  29                                      unsigned int start,
  30                                      unsigned int end)
  31 {
  32         return ((r >= start) && (r <= end));
  33 }
  34 
  35 /* This describes STA2X11 MFD chip for us, we may have several */
  36 struct sta2x11_mfd {
  37         struct sta2x11_instance *instance;
  38         struct regmap *regmap[sta2x11_n_mfd_plat_devs];
  39         spinlock_t lock[sta2x11_n_mfd_plat_devs];
  40         struct list_head list;
  41         void __iomem *regs[sta2x11_n_mfd_plat_devs];
  42 };
  43 
  44 static LIST_HEAD(sta2x11_mfd_list);
  45 
  46 /* Three functions to act on the list */
  47 static struct sta2x11_mfd *sta2x11_mfd_find(struct pci_dev *pdev)
  48 {
  49         struct sta2x11_instance *instance;
  50         struct sta2x11_mfd *mfd;
  51 
  52         if (!pdev && !list_empty(&sta2x11_mfd_list)) {
  53                 pr_warn("%s: Unspecified device, using first instance\n",
  54                         __func__);
  55                 return list_entry(sta2x11_mfd_list.next,
  56                                   struct sta2x11_mfd, list);
  57         }
  58 
  59         instance = sta2x11_get_instance(pdev);
  60         if (!instance)
  61                 return NULL;
  62         list_for_each_entry(mfd, &sta2x11_mfd_list, list) {
  63                 if (mfd->instance == instance)
  64                         return mfd;
  65         }
  66         return NULL;
  67 }
  68 
  69 static int sta2x11_mfd_add(struct pci_dev *pdev, gfp_t flags)
  70 {
  71         int i;
  72         struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
  73         struct sta2x11_instance *instance;
  74 
  75         if (mfd)
  76                 return -EBUSY;
  77         instance = sta2x11_get_instance(pdev);
  78         if (!instance)
  79                 return -EINVAL;
  80         mfd = kzalloc(sizeof(*mfd), flags);
  81         if (!mfd)
  82                 return -ENOMEM;
  83         INIT_LIST_HEAD(&mfd->list);
  84         for (i = 0; i < ARRAY_SIZE(mfd->lock); i++)
  85                 spin_lock_init(&mfd->lock[i]);
  86         mfd->instance = instance;
  87         list_add(&mfd->list, &sta2x11_mfd_list);
  88         return 0;
  89 }
  90 
  91 /* This function is exported and is not expected to fail */
  92 u32 __sta2x11_mfd_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val,
  93                        enum sta2x11_mfd_plat_dev index)
  94 {
  95         struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
  96         u32 r;
  97         unsigned long flags;
  98         void __iomem *regs;
  99 
 100         if (!mfd) {
 101                 dev_warn(&pdev->dev, ": can't access sctl regs\n");
 102                 return 0;
 103         }
 104 
 105         regs = mfd->regs[index];
 106         if (!regs) {
 107                 dev_warn(&pdev->dev, ": system ctl not initialized\n");
 108                 return 0;
 109         }
 110         spin_lock_irqsave(&mfd->lock[index], flags);
 111         r = readl(regs + reg);
 112         r &= ~mask;
 113         r |= val;
 114         if (mask)
 115                 writel(r, regs + reg);
 116         spin_unlock_irqrestore(&mfd->lock[index], flags);
 117         return r;
 118 }
 119 EXPORT_SYMBOL(__sta2x11_mfd_mask);
 120 
 121 int sta2x11_mfd_get_regs_data(struct platform_device *dev,
 122                               enum sta2x11_mfd_plat_dev index,
 123                               void __iomem **regs,
 124                               spinlock_t **lock)
 125 {
 126         struct pci_dev *pdev = *(struct pci_dev **)dev_get_platdata(&dev->dev);
 127         struct sta2x11_mfd *mfd;
 128 
 129         if (!pdev)
 130                 return -ENODEV;
 131         mfd = sta2x11_mfd_find(pdev);
 132         if (!mfd)
 133                 return -ENODEV;
 134         if (index >= sta2x11_n_mfd_plat_devs)
 135                 return -ENODEV;
 136         *regs = mfd->regs[index];
 137         *lock = &mfd->lock[index];
 138         pr_debug("%s %d *regs = %p\n", __func__, __LINE__, *regs);
 139         return *regs ? 0 : -ENODEV;
 140 }
 141 EXPORT_SYMBOL(sta2x11_mfd_get_regs_data);
 142 
 143 /*
 144  * Special sta2x11-mfd regmap lock/unlock functions
 145  */
 146 
 147 static void sta2x11_regmap_lock(void *__lock)
 148 {
 149         spinlock_t *lock = __lock;
 150         spin_lock(lock);
 151 }
 152 
 153 static void sta2x11_regmap_unlock(void *__lock)
 154 {
 155         spinlock_t *lock = __lock;
 156         spin_unlock(lock);
 157 }
 158 
 159 /* OTP (one time programmable registers do not require locking */
 160 static void sta2x11_regmap_nolock(void *__lock)
 161 {
 162 }
 163 
 164 static const char *sta2x11_mfd_names[sta2x11_n_mfd_plat_devs] = {
 165         [sta2x11_sctl] = STA2X11_MFD_SCTL_NAME,
 166         [sta2x11_apbreg] = STA2X11_MFD_APBREG_NAME,
 167         [sta2x11_apb_soc_regs] = STA2X11_MFD_APB_SOC_REGS_NAME,
 168         [sta2x11_scr] = STA2X11_MFD_SCR_NAME,
 169 };
 170 
 171 static bool sta2x11_sctl_writeable_reg(struct device *dev, unsigned int reg)
 172 {
 173         return !__reg_within_range(reg, SCTL_SCPCIECSBRST, SCTL_SCRSTSTA);
 174 }
 175 
 176 static struct regmap_config sta2x11_sctl_regmap_config = {
 177         .reg_bits = 32,
 178         .reg_stride = 4,
 179         .val_bits = 32,
 180         .lock = sta2x11_regmap_lock,
 181         .unlock = sta2x11_regmap_unlock,
 182         .max_register = SCTL_SCRSTSTA,
 183         .writeable_reg = sta2x11_sctl_writeable_reg,
 184 };
 185 
 186 static bool sta2x11_scr_readable_reg(struct device *dev, unsigned int reg)
 187 {
 188         return (reg == STA2X11_SECR_CR) ||
 189                 __reg_within_range(reg, STA2X11_SECR_FVR0, STA2X11_SECR_FVR1);
 190 }
 191 
 192 static bool sta2x11_scr_writeable_reg(struct device *dev, unsigned int reg)
 193 {
 194         return false;
 195 }
 196 
 197 static struct regmap_config sta2x11_scr_regmap_config = {
 198         .reg_bits = 32,
 199         .reg_stride = 4,
 200         .val_bits = 32,
 201         .lock = sta2x11_regmap_nolock,
 202         .unlock = sta2x11_regmap_nolock,
 203         .max_register = STA2X11_SECR_FVR1,
 204         .readable_reg = sta2x11_scr_readable_reg,
 205         .writeable_reg = sta2x11_scr_writeable_reg,
 206 };
 207 
 208 static bool sta2x11_apbreg_readable_reg(struct device *dev, unsigned int reg)
 209 {
 210         /* Two blocks (CAN and MLB, SARAC) 0x100 bytes apart */
 211         if (reg >= APBREG_BSR_SARAC)
 212                 reg -= APBREG_BSR_SARAC;
 213         switch (reg) {
 214         case APBREG_BSR:
 215         case APBREG_PAER:
 216         case APBREG_PWAC:
 217         case APBREG_PRAC:
 218         case APBREG_PCG:
 219         case APBREG_PUR:
 220         case APBREG_EMU_PCG:
 221                 return true;
 222         default:
 223                 return false;
 224         }
 225 }
 226 
 227 static bool sta2x11_apbreg_writeable_reg(struct device *dev, unsigned int reg)
 228 {
 229         if (reg >= APBREG_BSR_SARAC)
 230                 reg -= APBREG_BSR_SARAC;
 231         if (!sta2x11_apbreg_readable_reg(dev, reg))
 232                 return false;
 233         return reg != APBREG_PAER;
 234 }
 235 
 236 static struct regmap_config sta2x11_apbreg_regmap_config = {
 237         .reg_bits = 32,
 238         .reg_stride = 4,
 239         .val_bits = 32,
 240         .lock = sta2x11_regmap_lock,
 241         .unlock = sta2x11_regmap_unlock,
 242         .max_register = APBREG_EMU_PCG_SARAC,
 243         .readable_reg = sta2x11_apbreg_readable_reg,
 244         .writeable_reg = sta2x11_apbreg_writeable_reg,
 245 };
 246 
 247 static bool sta2x11_apb_soc_regs_readable_reg(struct device *dev,
 248                                               unsigned int reg)
 249 {
 250         return reg <= PCIE_SoC_INT_ROUTER_STATUS3_REG ||
 251                 __reg_within_range(reg, DMA_IP_CTRL_REG, SPARE3_RESERVED) ||
 252                 __reg_within_range(reg, MASTER_LOCK_REG,
 253                                    SYSTEM_CONFIG_STATUS_REG) ||
 254                 reg == MSP_CLK_CTRL_REG ||
 255                 __reg_within_range(reg, COMPENSATION_REG1, TEST_CTL_REG);
 256 }
 257 
 258 static bool sta2x11_apb_soc_regs_writeable_reg(struct device *dev,
 259                                                unsigned int reg)
 260 {
 261         if (!sta2x11_apb_soc_regs_readable_reg(dev, reg))
 262                 return false;
 263         switch (reg) {
 264         case PCIE_COMMON_CLOCK_CONFIG_0_4_0:
 265         case SYSTEM_CONFIG_STATUS_REG:
 266         case COMPENSATION_REG1:
 267         case PCIE_SoC_INT_ROUTER_STATUS0_REG...PCIE_SoC_INT_ROUTER_STATUS3_REG:
 268         case PCIE_PM_STATUS_0_PORT_0_4...PCIE_PM_STATUS_7_0_EP4:
 269                 return false;
 270         default:
 271                 return true;
 272         }
 273 }
 274 
 275 static struct regmap_config sta2x11_apb_soc_regs_regmap_config = {
 276         .reg_bits = 32,
 277         .reg_stride = 4,
 278         .val_bits = 32,
 279         .lock = sta2x11_regmap_lock,
 280         .unlock = sta2x11_regmap_unlock,
 281         .max_register = TEST_CTL_REG,
 282         .readable_reg = sta2x11_apb_soc_regs_readable_reg,
 283         .writeable_reg = sta2x11_apb_soc_regs_writeable_reg,
 284 };
 285 
 286 static struct regmap_config *
 287 sta2x11_mfd_regmap_configs[sta2x11_n_mfd_plat_devs] = {
 288         [sta2x11_sctl] = &sta2x11_sctl_regmap_config,
 289         [sta2x11_apbreg] = &sta2x11_apbreg_regmap_config,
 290         [sta2x11_apb_soc_regs] = &sta2x11_apb_soc_regs_regmap_config,
 291         [sta2x11_scr] = &sta2x11_scr_regmap_config,
 292 };
 293 
 294 /* Probe for the four platform devices */
 295 
 296 static int sta2x11_mfd_platform_probe(struct platform_device *dev,
 297                                       enum sta2x11_mfd_plat_dev index)
 298 {
 299         struct pci_dev **pdev;
 300         struct sta2x11_mfd *mfd;
 301         struct resource *res;
 302         const char *name = sta2x11_mfd_names[index];
 303         struct regmap_config *regmap_config = sta2x11_mfd_regmap_configs[index];
 304 
 305         pdev = dev_get_platdata(&dev->dev);
 306         mfd = sta2x11_mfd_find(*pdev);
 307         if (!mfd)
 308                 return -ENODEV;
 309         if (!regmap_config)
 310                 return -ENODEV;
 311 
 312         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 313         if (!res)
 314                 return -ENOMEM;
 315 
 316         if (!request_mem_region(res->start, resource_size(res), name))
 317                 return -EBUSY;
 318 
 319         mfd->regs[index] = ioremap(res->start, resource_size(res));
 320         if (!mfd->regs[index]) {
 321                 release_mem_region(res->start, resource_size(res));
 322                 return -ENOMEM;
 323         }
 324         regmap_config->lock_arg = &mfd->lock;
 325         /*
 326            No caching, registers could be reached both via regmap and via
 327            void __iomem *
 328         */
 329         regmap_config->cache_type = REGCACHE_NONE;
 330         mfd->regmap[index] = devm_regmap_init_mmio(&dev->dev, mfd->regs[index],
 331                                                    regmap_config);
 332         WARN_ON(IS_ERR(mfd->regmap[index]));
 333 
 334         return 0;
 335 }
 336 
 337 static int sta2x11_sctl_probe(struct platform_device *dev)
 338 {
 339         return sta2x11_mfd_platform_probe(dev, sta2x11_sctl);
 340 }
 341 
 342 static int sta2x11_apbreg_probe(struct platform_device *dev)
 343 {
 344         return sta2x11_mfd_platform_probe(dev, sta2x11_apbreg);
 345 }
 346 
 347 static int sta2x11_apb_soc_regs_probe(struct platform_device *dev)
 348 {
 349         return sta2x11_mfd_platform_probe(dev, sta2x11_apb_soc_regs);
 350 }
 351 
 352 static int sta2x11_scr_probe(struct platform_device *dev)
 353 {
 354         return sta2x11_mfd_platform_probe(dev, sta2x11_scr);
 355 }
 356 
 357 /* The three platform drivers */
 358 static struct platform_driver sta2x11_sctl_platform_driver = {
 359         .driver = {
 360                 .name   = STA2X11_MFD_SCTL_NAME,
 361         },
 362         .probe          = sta2x11_sctl_probe,
 363 };
 364 
 365 static struct platform_driver sta2x11_platform_driver = {
 366         .driver = {
 367                 .name   = STA2X11_MFD_APBREG_NAME,
 368         },
 369         .probe          = sta2x11_apbreg_probe,
 370 };
 371 
 372 static struct platform_driver sta2x11_apb_soc_regs_platform_driver = {
 373         .driver = {
 374                 .name   = STA2X11_MFD_APB_SOC_REGS_NAME,
 375         },
 376         .probe          = sta2x11_apb_soc_regs_probe,
 377 };
 378 
 379 static struct platform_driver sta2x11_scr_platform_driver = {
 380         .driver = {
 381                 .name = STA2X11_MFD_SCR_NAME,
 382         },
 383         .probe = sta2x11_scr_probe,
 384 };
 385 
 386 static struct platform_driver * const drivers[] = {
 387         &sta2x11_platform_driver,
 388         &sta2x11_sctl_platform_driver,
 389         &sta2x11_apb_soc_regs_platform_driver,
 390         &sta2x11_scr_platform_driver,
 391 };
 392 
 393 static int __init sta2x11_drivers_init(void)
 394 {
 395         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 396 }
 397 
 398 /*
 399  * What follows are the PCI devices that host the above pdevs.
 400  * Each logic block is 4kB and they are all consecutive: we use this info.
 401  */
 402 
 403 /* Mfd 0 device */
 404 
 405 /* Mfd 0, Bar 0 */
 406 enum mfd0_bar0_cells {
 407         STA2X11_GPIO_0 = 0,
 408         STA2X11_GPIO_1,
 409         STA2X11_GPIO_2,
 410         STA2X11_GPIO_3,
 411         STA2X11_SCTL,
 412         STA2X11_SCR,
 413         STA2X11_TIME,
 414 };
 415 /* Mfd 0 , Bar 1 */
 416 enum mfd0_bar1_cells {
 417         STA2X11_APBREG = 0,
 418 };
 419 #define CELL_4K(_name, _cell) { \
 420                 .name = _name, \
 421                 .start = _cell * 4096, .end = _cell * 4096 + 4095, \
 422                 .flags = IORESOURCE_MEM, \
 423                 }
 424 
 425 static const struct resource gpio_resources[] = {
 426         {
 427                 /* 4 consecutive cells, 1 driver */
 428                 .name = STA2X11_MFD_GPIO_NAME,
 429                 .start = 0,
 430                 .end = (4 * 4096) - 1,
 431                 .flags = IORESOURCE_MEM,
 432         }
 433 };
 434 static const struct resource sctl_resources[] = {
 435         CELL_4K(STA2X11_MFD_SCTL_NAME, STA2X11_SCTL),
 436 };
 437 static const struct resource scr_resources[] = {
 438         CELL_4K(STA2X11_MFD_SCR_NAME, STA2X11_SCR),
 439 };
 440 static const struct resource time_resources[] = {
 441         CELL_4K(STA2X11_MFD_TIME_NAME, STA2X11_TIME),
 442 };
 443 
 444 static const struct resource apbreg_resources[] = {
 445         CELL_4K(STA2X11_MFD_APBREG_NAME, STA2X11_APBREG),
 446 };
 447 
 448 #define DEV(_name, _r) \
 449         { .name = _name, .num_resources = ARRAY_SIZE(_r), .resources = _r, }
 450 
 451 static struct mfd_cell sta2x11_mfd0_bar0[] = {
 452         /* offset 0: we add pdata later */
 453         DEV(STA2X11_MFD_GPIO_NAME, gpio_resources),
 454         DEV(STA2X11_MFD_SCTL_NAME, sctl_resources),
 455         DEV(STA2X11_MFD_SCR_NAME,  scr_resources),
 456         DEV(STA2X11_MFD_TIME_NAME, time_resources),
 457 };
 458 
 459 static struct mfd_cell sta2x11_mfd0_bar1[] = {
 460         DEV(STA2X11_MFD_APBREG_NAME, apbreg_resources),
 461 };
 462 
 463 /* Mfd 1 devices */
 464 
 465 /* Mfd 1, Bar 0 */
 466 enum mfd1_bar0_cells {
 467         STA2X11_VIC = 0,
 468 };
 469 
 470 /* Mfd 1, Bar 1 */
 471 enum mfd1_bar1_cells {
 472         STA2X11_APB_SOC_REGS = 0,
 473 };
 474 
 475 static const struct resource vic_resources[] = {
 476         CELL_4K(STA2X11_MFD_VIC_NAME, STA2X11_VIC),
 477 };
 478 
 479 static const struct resource apb_soc_regs_resources[] = {
 480         CELL_4K(STA2X11_MFD_APB_SOC_REGS_NAME, STA2X11_APB_SOC_REGS),
 481 };
 482 
 483 static struct mfd_cell sta2x11_mfd1_bar0[] = {
 484         DEV(STA2X11_MFD_VIC_NAME, vic_resources),
 485 };
 486 
 487 static struct mfd_cell sta2x11_mfd1_bar1[] = {
 488         DEV(STA2X11_MFD_APB_SOC_REGS_NAME, apb_soc_regs_resources),
 489 };
 490 
 491 
 492 static int sta2x11_mfd_suspend(struct pci_dev *pdev, pm_message_t state)
 493 {
 494         pci_save_state(pdev);
 495         pci_disable_device(pdev);
 496         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 497 
 498         return 0;
 499 }
 500 
 501 static int sta2x11_mfd_resume(struct pci_dev *pdev)
 502 {
 503         int err;
 504 
 505         pci_set_power_state(pdev, PCI_D0);
 506         err = pci_enable_device(pdev);
 507         if (err)
 508                 return err;
 509         pci_restore_state(pdev);
 510 
 511         return 0;
 512 }
 513 
 514 struct sta2x11_mfd_bar_setup_data {
 515         struct mfd_cell *cells;
 516         int ncells;
 517 };
 518 
 519 struct sta2x11_mfd_setup_data {
 520         struct sta2x11_mfd_bar_setup_data bars[2];
 521 };
 522 
 523 #define STA2X11_MFD0 0
 524 #define STA2X11_MFD1 1
 525 
 526 static struct sta2x11_mfd_setup_data mfd_setup_data[] = {
 527         /* Mfd 0: gpio, sctl, scr, timers / apbregs */
 528         [STA2X11_MFD0] = {
 529                 .bars = {
 530                         [0] = {
 531                                 .cells = sta2x11_mfd0_bar0,
 532                                 .ncells = ARRAY_SIZE(sta2x11_mfd0_bar0),
 533                         },
 534                         [1] = {
 535                                 .cells = sta2x11_mfd0_bar1,
 536                                 .ncells = ARRAY_SIZE(sta2x11_mfd0_bar1),
 537                         },
 538                 },
 539         },
 540         /* Mfd 1: vic / apb-soc-regs */
 541         [STA2X11_MFD1] = {
 542                 .bars = {
 543                         [0] = {
 544                                 .cells = sta2x11_mfd1_bar0,
 545                                 .ncells = ARRAY_SIZE(sta2x11_mfd1_bar0),
 546                         },
 547                         [1] = {
 548                                 .cells = sta2x11_mfd1_bar1,
 549                                 .ncells = ARRAY_SIZE(sta2x11_mfd1_bar1),
 550                         },
 551                 },
 552         },
 553 };
 554 
 555 static void sta2x11_mfd_setup(struct pci_dev *pdev,
 556                               struct sta2x11_mfd_setup_data *sd)
 557 {
 558         int i, j;
 559         for (i = 0; i < ARRAY_SIZE(sd->bars); i++)
 560                 for (j = 0; j < sd->bars[i].ncells; j++) {
 561                         sd->bars[i].cells[j].pdata_size = sizeof(pdev);
 562                         sd->bars[i].cells[j].platform_data = &pdev;
 563                 }
 564 }
 565 
 566 static int sta2x11_mfd_probe(struct pci_dev *pdev,
 567                              const struct pci_device_id *pci_id)
 568 {
 569         int err, i;
 570         struct sta2x11_mfd_setup_data *setup_data;
 571 
 572         dev_info(&pdev->dev, "%s\n", __func__);
 573 
 574         err = pci_enable_device(pdev);
 575         if (err) {
 576                 dev_err(&pdev->dev, "Can't enable device.\n");
 577                 return err;
 578         }
 579 
 580         err = pci_enable_msi(pdev);
 581         if (err)
 582                 dev_info(&pdev->dev, "Enable msi failed\n");
 583 
 584         setup_data = pci_id->device == PCI_DEVICE_ID_STMICRO_GPIO ?
 585                 &mfd_setup_data[STA2X11_MFD0] :
 586                 &mfd_setup_data[STA2X11_MFD1];
 587 
 588         /* platform data is the pci device for all of them */
 589         sta2x11_mfd_setup(pdev, setup_data);
 590 
 591         /* Record this pdev before mfd_add_devices: their probe looks for it */
 592         if (!sta2x11_mfd_find(pdev))
 593                 sta2x11_mfd_add(pdev, GFP_ATOMIC);
 594 
 595         /* Just 2 bars for all mfd's at present */
 596         for (i = 0; i < 2; i++) {
 597                 err = mfd_add_devices(&pdev->dev, -1,
 598                                       setup_data->bars[i].cells,
 599                                       setup_data->bars[i].ncells,
 600                                       &pdev->resource[i],
 601                                       0, NULL);
 602                 if (err) {
 603                         dev_err(&pdev->dev,
 604                                 "mfd_add_devices[%d] failed: %d\n", i, err);
 605                         goto err_disable;
 606                 }
 607         }
 608 
 609         return 0;
 610 
 611 err_disable:
 612         mfd_remove_devices(&pdev->dev);
 613         pci_disable_device(pdev);
 614         pci_disable_msi(pdev);
 615         return err;
 616 }
 617 
 618 static const struct pci_device_id sta2x11_mfd_tbl[] = {
 619         {PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_GPIO)},
 620         {PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_VIC)},
 621         {0,},
 622 };
 623 
 624 static struct pci_driver sta2x11_mfd_driver = {
 625         .name =         "sta2x11-mfd",
 626         .id_table =     sta2x11_mfd_tbl,
 627         .probe =        sta2x11_mfd_probe,
 628         .suspend =      sta2x11_mfd_suspend,
 629         .resume =       sta2x11_mfd_resume,
 630 };
 631 
 632 static int __init sta2x11_mfd_init(void)
 633 {
 634         pr_info("%s\n", __func__);
 635         return pci_register_driver(&sta2x11_mfd_driver);
 636 }
 637 
 638 /*
 639  * All of this must be ready before "normal" devices like MMCI appear.
 640  * But MFD (the pci device) can't be too early. The following choice
 641  * prepares platform drivers very early and probe the PCI device later,
 642  * but before other PCI devices.
 643  */
 644 subsys_initcall(sta2x11_drivers_init);
 645 rootfs_initcall(sta2x11_mfd_init);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/mfd/sta2x11-mfd.c

DEFINITIONS
