drivers/mfd/sta2x11-mfd.c

   1 /*
   2  * Copyright (c) 2009-2011 Wind River Systems, Inc.
   3  * Copyright (c) 2011 ST Microelectronics (Alessandro Rubini)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12  * See the GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17  *
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/errno.h>
  24 #include <linux/device.h>
  25 #include <linux/slab.h>
  26 #include <linux/list.h>
  27 #include <linux/io.h>
  28 #include <linux/ioport.h>
  29 #include <linux/pci.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/seq_file.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/mfd/core.h>
  34 #include <linux/mfd/sta2x11-mfd.h>
  35
  36 #include <asm/sta2x11.h>
  37
  38 /* This describes STA2X11 MFD chip for us, we may have several */
  39 struct sta2x11_mfd {
  40         struct sta2x11_instance *instance;
  41         spinlock_t lock;
  42         struct list_head list;
  43         void __iomem *sctl_regs;
  44         void __iomem *apbreg_regs;
  45 };
  46
  47 static LIST_HEAD(sta2x11_mfd_list);
  48
  49 /* Three functions to act on the list */
  50 static struct sta2x11_mfd *sta2x11_mfd_find(struct pci_dev *pdev)
  51 {
  52         struct sta2x11_instance *instance;
  53         struct sta2x11_mfd *mfd;
  54
  55         if (!pdev && !list_empty(&sta2x11_mfd_list)) {
  56                 pr_warning("%s: Unspecified device, "
  57                             "using first instance\n", __func__);
  58                 return list_entry(sta2x11_mfd_list.next,
  59                                   struct sta2x11_mfd, list);
  60         }
  61
  62         instance = sta2x11_get_instance(pdev);
  63         if (!instance)
  64                 return NULL;
  65         list_for_each_entry(mfd, &sta2x11_mfd_list, list) {
  66                 if (mfd->instance == instance)
  67                         return mfd;
  68         }
  69         return NULL;
  70 }
  71
  72 static int __devinit sta2x11_mfd_add(struct pci_dev *pdev, gfp_t flags)
  73 {
  74         struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
  75         struct sta2x11_instance *instance;
  76
  77         if (mfd)
  78                 return -EBUSY;
  79         instance = sta2x11_get_instance(pdev);
  80         if (!instance)
  81                 return -EINVAL;
  82         mfd = kzalloc(sizeof(*mfd), flags);
  83         if (!mfd)
  84                 return -ENOMEM;
  85         INIT_LIST_HEAD(&mfd->list);
  86         spin_lock_init(&mfd->lock);
  87         mfd->instance = instance;
  88         list_add(&mfd->list, &sta2x11_mfd_list);
  89         return 0;
  90 }
  91
  92 static int __devexit mfd_remove(struct pci_dev *pdev)
  93 {
  94         struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
  95
  96         if (!mfd)
  97                 return -ENODEV;
  98         list_del(&mfd->list);
  99         kfree(mfd);
 100         return 0;
 101 }
 102
 103 /* These two functions are exported and are not expected to fail */
 104 u32 sta2x11_sctl_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val)
 105 {
 106         struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
 107         u32 r;
 108         unsigned long flags;
 109
 110         if (!mfd) {
 111                 dev_warn(&pdev->dev, ": can't access sctl regs\n");
 112                 return 0;
 113         }
 114         if (!mfd->sctl_regs) {
 115                 dev_warn(&pdev->dev, ": system ctl not initialized\n");
 116                 return 0;
 117         }
 118         spin_lock_irqsave(&mfd->lock, flags);
 119         r = readl(mfd->sctl_regs + reg);
 120         r &= ~mask;
 121         r |= val;
 122         if (mask)
 123                 writel(r, mfd->sctl_regs + reg);
 124         spin_unlock_irqrestore(&mfd->lock, flags);
 125         return r;
 126 }
 127 EXPORT_SYMBOL(sta2x11_sctl_mask);
 128
 129 u32 sta2x11_apbreg_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val)
 130 {
 131         struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
 132         u32 r;
 133         unsigned long flags;
 134
 135         if (!mfd) {
 136                 dev_warn(&pdev->dev, ": can't access apb regs\n");
 137                 return 0;
 138         }
 139         if (!mfd->apbreg_regs) {
 140                 dev_warn(&pdev->dev, ": apb bridge not initialized\n");
 141                 return 0;
 142         }
 143         spin_lock_irqsave(&mfd->lock, flags);
 144         r = readl(mfd->apbreg_regs + reg);
 145         r &= ~mask;
 146         r |= val;
 147         if (mask)
 148                 writel(r, mfd->apbreg_regs + reg);
 149         spin_unlock_irqrestore(&mfd->lock, flags);
 150         return r;
 151 }
 152 EXPORT_SYMBOL(sta2x11_apbreg_mask);
 153
 154 /* Two debugfs files, for our registers (FIXME: one instance only) */
 155 #define REG(regname) {.name = #regname, .offset = SCTL_ ## regname}
 156 static struct debugfs_reg32 sta2x11_sctl_regs[] = {
 157         REG(SCCTL), REG(ARMCFG), REG(SCPLLCTL), REG(SCPLLFCTRL),
 158         REG(SCRESFRACT), REG(SCRESCTRL1), REG(SCRESXTRL2), REG(SCPEREN0),
 159         REG(SCPEREN1), REG(SCPEREN2), REG(SCGRST), REG(SCPCIPMCR1),
 160         REG(SCPCIPMCR2), REG(SCPCIPMSR1), REG(SCPCIPMSR2), REG(SCPCIPMSR3),
 161         REG(SCINTREN), REG(SCRISR), REG(SCCLKSTAT0), REG(SCCLKSTAT1),
 162         REG(SCCLKSTAT2), REG(SCRSTSTA),
 163 };
 164 #undef REG
 165
 166 static struct debugfs_regset32 sctl_regset = {
 167         .regs = sta2x11_sctl_regs,
 168         .nregs = ARRAY_SIZE(sta2x11_sctl_regs),
 169 };
 170
 171 #define REG(regname) {.name = #regname, .offset = regname}
 172 static struct debugfs_reg32 sta2x11_apbreg_regs[] = {
 173         REG(APBREG_BSR), REG(APBREG_PAER), REG(APBREG_PWAC), REG(APBREG_PRAC),
 174         REG(APBREG_PCG), REG(APBREG_PUR), REG(APBREG_EMU_PCG),
 175 };
 176 #undef REG
 177
 178 static struct debugfs_regset32 apbreg_regset = {
 179         .regs = sta2x11_apbreg_regs,
 180         .nregs = ARRAY_SIZE(sta2x11_apbreg_regs),
 181 };
 182
 183 static struct dentry *sta2x11_sctl_debugfs;
 184 static struct dentry *sta2x11_apbreg_debugfs;
 185
 186 /* Probe for the two platform devices */
 187 static int sta2x11_sctl_probe(struct platform_device *dev)
 188 {
 189         struct pci_dev **pdev;
 190         struct sta2x11_mfd *mfd;
 191         struct resource *res;
 192
 193         pdev = dev->dev.platform_data;
 194         mfd = sta2x11_mfd_find(*pdev);
 195         if (!mfd)
 196                 return -ENODEV;
 197
 198         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 199         if (!res)
 200                 return -ENOMEM;
 201
 202         if (!request_mem_region(res->start, resource_size(res),
 203                                 "sta2x11-sctl"))
 204                 return -EBUSY;
 205
 206         mfd->sctl_regs = ioremap(res->start, resource_size(res));
 207         if (!mfd->sctl_regs) {
 208                 release_mem_region(res->start, resource_size(res));
 209                 return -ENOMEM;
 210         }
 211         sctl_regset.base = mfd->sctl_regs;
 212         sta2x11_sctl_debugfs = debugfs_create_regset32("sta2x11-sctl",
 213                                                   S_IFREG | S_IRUGO,
 214                                                   NULL, &sctl_regset);
 215         return 0;
 216 }
 217
 218 static int sta2x11_apbreg_probe(struct platform_device *dev)
 219 {
 220         struct pci_dev **pdev;
 221         struct sta2x11_mfd *mfd;
 222         struct resource *res;
 223
 224         pdev = dev->dev.platform_data;
 225         dev_dbg(&dev->dev, "%s: pdata is %p\n", __func__, pdev);
 226         dev_dbg(&dev->dev, "%s: *pdata is %p\n", __func__, *pdev);
 227
 228         mfd = sta2x11_mfd_find(*pdev);
 229         if (!mfd)
 230                 return -ENODEV;
 231
 232         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 233         if (!res)
 234                 return -ENOMEM;
 235
 236         if (!request_mem_region(res->start, resource_size(res),
 237                                 "sta2x11-apbreg"))
 238                 return -EBUSY;
 239
 240         mfd->apbreg_regs = ioremap(res->start, resource_size(res));
 241         if (!mfd->apbreg_regs) {
 242                 release_mem_region(res->start, resource_size(res));
 243                 return -ENOMEM;
 244         }
 245         dev_dbg(&dev->dev, "%s: regbase %p\n", __func__, mfd->apbreg_regs);
 246
 247         apbreg_regset.base = mfd->apbreg_regs;
 248         sta2x11_apbreg_debugfs = debugfs_create_regset32("sta2x11-apbreg",
 249                                                   S_IFREG | S_IRUGO,
 250                                                   NULL, &apbreg_regset);
 251         return 0;
 252 }
 253
 254 /* The two platform drivers */
 255 static struct platform_driver sta2x11_sctl_platform_driver = {
 256         .driver = {
 257                 .name   = "sta2x11-sctl",
 258                 .owner  = THIS_MODULE,
 259         },
 260         .probe          = sta2x11_sctl_probe,
 261 };
 262
 263 static int __init sta2x11_sctl_init(void)
 264 {
 265         pr_info("%s\n", __func__);
 266         return platform_driver_register(&sta2x11_sctl_platform_driver);
 267 }
 268
 269 static struct platform_driver sta2x11_platform_driver = {
 270         .driver = {
 271                 .name   = "sta2x11-apbreg",
 272                 .owner  = THIS_MODULE,
 273         },
 274         .probe          = sta2x11_apbreg_probe,
 275 };
 276
 277 static int __init sta2x11_apbreg_init(void)
 278 {
 279         pr_info("%s\n", __func__);
 280         return platform_driver_register(&sta2x11_platform_driver);
 281 }
 282
 283 /*
 284  * What follows is the PCI device that hosts the above two pdevs.
 285  * Each logic block is 4kB and they are all consecutive: we use this info.
 286  */
 287
 288 /* Bar 0 */
 289 enum bar0_cells {
 290         STA2X11_GPIO_0 = 0,
 291         STA2X11_GPIO_1,
 292         STA2X11_GPIO_2,
 293         STA2X11_GPIO_3,
 294         STA2X11_SCTL,
 295         STA2X11_SCR,
 296         STA2X11_TIME,
 297 };
 298 /* Bar 1 */
 299 enum bar1_cells {
 300         STA2X11_APBREG = 0,
 301 };
 302 #define CELL_4K(_name, _cell) { \
 303                 .name = _name, \
 304                 .start = _cell * 4096, .end = _cell * 4096 + 4095, \
 305                 .flags = IORESOURCE_MEM, \
 306                 }
 307
 308 static const __devinitconst struct resource gpio_resources[] = {
 309         {
 310                 .name = "sta2x11_gpio", /* 4 consecutive cells, 1 driver */
 311                 .start = 0,
 312                 .end = (4 * 4096) - 1,
 313                 .flags = IORESOURCE_MEM,
 314         }
 315 };
 316 static const __devinitconst struct resource sctl_resources[] = {
 317         CELL_4K("sta2x11-sctl", STA2X11_SCTL),
 318 };
 319 static const __devinitconst struct resource scr_resources[] = {
 320         CELL_4K("sta2x11-scr", STA2X11_SCR),
 321 };
 322 static const __devinitconst struct resource time_resources[] = {
 323         CELL_4K("sta2x11-time", STA2X11_TIME),
 324 };
 325
 326 static const __devinitconst struct resource apbreg_resources[] = {
 327         CELL_4K("sta2x11-apbreg", STA2X11_APBREG),
 328 };
 329
 330 #define DEV(_name, _r) \
 331         { .name = _name, .num_resources = ARRAY_SIZE(_r), .resources = _r, }
 332
 333 static __devinitdata struct mfd_cell sta2x11_mfd_bar0[] = {
 334         DEV("sta2x11-gpio", gpio_resources), /* offset 0: we add pdata later */
 335         DEV("sta2x11-sctl", sctl_resources),
 336         DEV("sta2x11-scr", scr_resources),
 337         DEV("sta2x11-time", time_resources),
 338 };
 339
 340 static __devinitdata struct mfd_cell sta2x11_mfd_bar1[] = {
 341         DEV("sta2x11-apbreg", apbreg_resources),
 342 };
 343
 344 static int sta2x11_mfd_suspend(struct pci_dev *pdev, pm_message_t state)
 345 {
 346         pci_save_state(pdev);
 347         pci_disable_device(pdev);
 348         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 349
 350         return 0;
 351 }
 352
 353 static int sta2x11_mfd_resume(struct pci_dev *pdev)
 354 {
 355         int err;
 356
 357         pci_set_power_state(pdev, 0);
 358         err = pci_enable_device(pdev);
 359         if (err)
 360                 return err;
 361         pci_restore_state(pdev);
 362
 363         return 0;
 364 }
 365
 366 static int __devinit sta2x11_mfd_probe(struct pci_dev *pdev,
 367                                        const struct pci_device_id *pci_id)
 368 {
 369         int err, i;
 370         struct sta2x11_gpio_pdata *gpio_data;
 371
 372         dev_info(&pdev->dev, "%s\n", __func__);
 373
 374         err = pci_enable_device(pdev);
 375         if (err) {
 376                 dev_err(&pdev->dev, "Can't enable device.\n");
 377                 return err;
 378         }
 379
 380         err = pci_enable_msi(pdev);
 381         if (err)
 382                 dev_info(&pdev->dev, "Enable msi failed\n");
 383
 384         /* Read gpio config data as pci device's platform data */
 385         gpio_data = dev_get_platdata(&pdev->dev);
 386         if (!gpio_data)
 387                 dev_warn(&pdev->dev, "no gpio configuration\n");
 388
 389         dev_dbg(&pdev->dev, "%s, gpio_data = %p (%p)\n", __func__,
 390                 gpio_data, &gpio_data);
 391         dev_dbg(&pdev->dev, "%s, pdev = %p (%p)\n", __func__,
 392                 pdev, &pdev);
 393
 394         /* platform data is the pci device for all of them */
 395         for (i = 0; i < ARRAY_SIZE(sta2x11_mfd_bar0); i++) {
 396                 sta2x11_mfd_bar0[i].pdata_size = sizeof(pdev);
 397                 sta2x11_mfd_bar0[i].platform_data = &pdev;
 398         }
 399         sta2x11_mfd_bar1[0].pdata_size = sizeof(pdev);
 400         sta2x11_mfd_bar1[0].platform_data = &pdev;
 401
 402         /* Record this pdev before mfd_add_devices: their probe looks for it */
 403         sta2x11_mfd_add(pdev, GFP_ATOMIC);
 404
 405
 406         err = mfd_add_devices(&pdev->dev, -1,
 407                               sta2x11_mfd_bar0,
 408                               ARRAY_SIZE(sta2x11_mfd_bar0),
 409                               &pdev->resource[0],
 410                               0);
 411         if (err) {
 412                 dev_err(&pdev->dev, "mfd_add_devices[0] failed: %d\n", err);
 413                 goto err_disable;
 414         }
 415
 416         err = mfd_add_devices(&pdev->dev, -1,
 417                               sta2x11_mfd_bar1,
 418                               ARRAY_SIZE(sta2x11_mfd_bar1),
 419                               &pdev->resource[1],
 420                               0);
 421         if (err) {
 422                 dev_err(&pdev->dev, "mfd_add_devices[1] failed: %d\n", err);
 423                 goto err_disable;
 424         }
 425
 426         return 0;
 427
 428 err_disable:
 429         mfd_remove_devices(&pdev->dev);
 430         pci_disable_device(pdev);
 431         pci_disable_msi(pdev);
 432         return err;
 433 }
 434
 435 static DEFINE_PCI_DEVICE_TABLE(sta2x11_mfd_tbl) = {
 436         {PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_GPIO)},
 437         {0,},
 438 };
 439
 440 static struct pci_driver sta2x11_mfd_driver = {
 441         .name =         "sta2x11-mfd",
 442         .id_table =     sta2x11_mfd_tbl,
 443         .probe =        sta2x11_mfd_probe,
 444         .suspend =      sta2x11_mfd_suspend,
 445         .resume =       sta2x11_mfd_resume,
 446 };
 447
 448 static int __init sta2x11_mfd_init(void)
 449 {
 450         pr_info("%s\n", __func__);
 451         return pci_register_driver(&sta2x11_mfd_driver);
 452 }
 453
 454 /*
 455  * All of this must be ready before "normal" devices like MMCI appear.
 456  * But MFD (the pci device) can't be too early. The following choice
 457  * prepares platform drivers very early and probe the PCI device later,
 458  * but before other PCI devices.
 459  */
 460 subsys_initcall(sta2x11_apbreg_init);
 461 subsys_initcall(sta2x11_sctl_init);
 462 rootfs_initcall(sta2x11_mfd_init);
 463
 464 MODULE_LICENSE("GPL v2");
 465 MODULE_AUTHOR("Wind River");
 466 MODULE_DESCRIPTION("STA2x11 mfd for GPIO, SCTL and APBREG");
 467 MODULE_DEVICE_TABLE(pci, sta2x11_mfd_tbl);