linux/drivers/mfd/sta2x11-mfd.c
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   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 */
  39struct 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
  47static LIST_HEAD(sta2x11_mfd_list);
  48
  49/* Three functions to act on the list */
  50static 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
  72static 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
  92static 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 */
 104u32 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}
 127EXPORT_SYMBOL(sta2x11_sctl_mask);
 128
 129u32 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}
 152EXPORT_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}
 156static 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
 166static 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}
 172static 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
 178static struct debugfs_regset32 apbreg_regset = {
 179        .regs = sta2x11_apbreg_regs,
 180        .nregs = ARRAY_SIZE(sta2x11_apbreg_regs),
 181};
 182
 183static struct dentry *sta2x11_sctl_debugfs;
 184static struct dentry *sta2x11_apbreg_debugfs;
 185
 186/* Probe for the two platform devices */
 187static 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
 218static 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 */
 255static 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
 263static int __init sta2x11_sctl_init(void)
 264{
 265        pr_info("%s\n", __func__);
 266        return platform_driver_register(&sta2x11_sctl_platform_driver);
 267}
 268
 269static struct platform_driver sta2x11_platform_driver = {
 270        .driver = {
 271                .name   = "sta2x11-apbreg",
 272                .owner  = THIS_MODULE,
 273        },
 274        .probe          = sta2x11_apbreg_probe,
 275};
 276
 277static 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 */
 289enum 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 */
 299enum 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
 308static 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};
 316static const __devinitconst struct resource sctl_resources[] = {
 317        CELL_4K("sta2x11-sctl", STA2X11_SCTL),
 318};
 319static const __devinitconst struct resource scr_resources[] = {
 320        CELL_4K("sta2x11-scr", STA2X11_SCR),
 321};
 322static const __devinitconst struct resource time_resources[] = {
 323        CELL_4K("sta2x11-time", STA2X11_TIME),
 324};
 325
 326static 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
 333static __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
 340static __devinitdata struct mfd_cell sta2x11_mfd_bar1[] = {
 341        DEV("sta2x11-apbreg", apbreg_resources),
 342};
 343
 344static 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
 353static 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
 366static 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, NULL);
 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, NULL);
 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
 428err_disable:
 429        mfd_remove_devices(&pdev->dev);
 430        pci_disable_device(pdev);
 431        pci_disable_msi(pdev);
 432        return err;
 433}
 434
 435static DEFINE_PCI_DEVICE_TABLE(sta2x11_mfd_tbl) = {
 436        {PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_GPIO)},
 437        {0,},
 438};
 439
 440static 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
 448static 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 */
 460subsys_initcall(sta2x11_apbreg_init);
 461subsys_initcall(sta2x11_sctl_init);
 462rootfs_initcall(sta2x11_mfd_init);
 463
 464MODULE_LICENSE("GPL v2");
 465MODULE_AUTHOR("Wind River");
 466MODULE_DESCRIPTION("STA2x11 mfd for GPIO, SCTL and APBREG");
 467MODULE_DEVICE_TABLE(pci, sta2x11_mfd_tbl);
 468
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