drivers/mfd/t7l66xb.c

   1 /*
   2  *
   3  * Toshiba T7L66XB core mfd support
   4  *
   5  * Copyright (c) 2005, 2007, 2008 Ian Molton
   6  * Copyright (c) 2008 Dmitry Baryshkov
   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 version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * T7L66 features:
  13  *
  14  * Supported in this driver:
  15  * SD/MMC
  16  * SM/NAND flash controller
  17  *
  18  * As yet not supported
  19  * GPIO interface (on NAND pins)
  20  * Serial interface
  21  * TFT 'interface converter'
  22  * PCMCIA interface logic
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/err.h>
  28 #include <linux/io.h>
  29 #include <linux/irq.h>
  30 #include <linux/clk.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/mfd/core.h>
  33 #include <linux/mfd/tmio.h>
  34 #include <linux/mfd/t7l66xb.h>
  35
  36 enum {
  37         T7L66XB_CELL_NAND,
  38         T7L66XB_CELL_MMC,
  39 };
  40
  41 static const struct resource t7l66xb_mmc_resources[] = {
  42         {
  43                 .start = 0x800,
  44                 .end    = 0x9ff,
  45                 .flags = IORESOURCE_MEM,
  46         },
  47         {
  48                 .start = IRQ_T7L66XB_MMC,
  49                 .end    = IRQ_T7L66XB_MMC,
  50                 .flags = IORESOURCE_IRQ,
  51         },
  52 };
  53
  54 #define SCR_REVID       0x08            /* b Revision ID        */
  55 #define SCR_IMR         0x42            /* b Interrupt Mask     */
  56 #define SCR_DEV_CTL     0xe0            /* b Device control     */
  57 #define SCR_ISR         0xe1            /* b Interrupt Status   */
  58 #define SCR_GPO_OC      0xf0            /* b GPO output control */
  59 #define SCR_GPO_OS      0xf1            /* b GPO output enable  */
  60 #define SCR_GPI_S       0xf2            /* w GPI status         */
  61 #define SCR_APDC        0xf8            /* b Active pullup down ctrl */
  62
  63 #define SCR_DEV_CTL_USB         BIT(0)  /* USB enable           */
  64 #define SCR_DEV_CTL_MMC         BIT(1)  /* MMC enable           */
  65
  66 /*--------------------------------------------------------------------------*/
  67
  68 struct t7l66xb {
  69         void __iomem            *scr;
  70         /* Lock to protect registers requiring read/modify/write ops. */
  71         spinlock_t              lock;
  72
  73         struct resource         rscr;
  74         struct clk              *clk48m;
  75         struct clk              *clk32k;
  76         int                     irq;
  77         int                     irq_base;
  78 };
  79
  80 /*--------------------------------------------------------------------------*/
  81
  82 static int t7l66xb_mmc_enable(struct platform_device *mmc)
  83 {
  84         struct platform_device *dev = to_platform_device(mmc->dev.parent);
  85         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
  86         unsigned long flags;
  87         u8 dev_ctl;
  88
  89         clk_enable(t7l66xb->clk32k);
  90
  91         spin_lock_irqsave(&t7l66xb->lock, flags);
  92
  93         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
  94         dev_ctl |= SCR_DEV_CTL_MMC;
  95         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
  96
  97         spin_unlock_irqrestore(&t7l66xb->lock, flags);
  98
  99         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
 100                 t7l66xb_mmc_resources[0].start & 0xfffe);
 101
 102         return 0;
 103 }
 104
 105 static int t7l66xb_mmc_disable(struct platform_device *mmc)
 106 {
 107         struct platform_device *dev = to_platform_device(mmc->dev.parent);
 108         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 109         unsigned long flags;
 110         u8 dev_ctl;
 111
 112         spin_lock_irqsave(&t7l66xb->lock, flags);
 113
 114         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
 115         dev_ctl &= ~SCR_DEV_CTL_MMC;
 116         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
 117
 118         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 119
 120         clk_disable(t7l66xb->clk32k);
 121
 122         return 0;
 123 }
 124
 125 static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
 126 {
 127         struct platform_device *dev = to_platform_device(mmc->dev.parent);
 128         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 129
 130         tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
 131 }
 132
 133 static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
 134 {
 135         struct platform_device *dev = to_platform_device(mmc->dev.parent);
 136         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 137
 138         tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
 139 }
 140
 141 /*--------------------------------------------------------------------------*/
 142
 143 static struct tmio_mmc_data t7166xb_mmc_data = {
 144         .hclk = 24000000,
 145         .set_pwr = t7l66xb_mmc_pwr,
 146         .set_clk_div = t7l66xb_mmc_clk_div,
 147 };
 148
 149 static const struct resource t7l66xb_nand_resources[] = {
 150         {
 151                 .start  = 0xc00,
 152                 .end    = 0xc07,
 153                 .flags  = IORESOURCE_MEM,
 154         },
 155         {
 156                 .start  = 0x0100,
 157                 .end    = 0x01ff,
 158                 .flags  = IORESOURCE_MEM,
 159         },
 160         {
 161                 .start  = IRQ_T7L66XB_NAND,
 162                 .end    = IRQ_T7L66XB_NAND,
 163                 .flags  = IORESOURCE_IRQ,
 164         },
 165 };
 166
 167 static struct mfd_cell t7l66xb_cells[] = {
 168         [T7L66XB_CELL_MMC] = {
 169                 .name = "tmio-mmc",
 170                 .enable = t7l66xb_mmc_enable,
 171                 .disable = t7l66xb_mmc_disable,
 172                 .driver_data = &t7166xb_mmc_data,
 173                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
 174                 .resources = t7l66xb_mmc_resources,
 175         },
 176         [T7L66XB_CELL_NAND] = {
 177                 .name = "tmio-nand",
 178                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
 179                 .resources = t7l66xb_nand_resources,
 180         },
 181 };
 182
 183 /*--------------------------------------------------------------------------*/
 184
 185 /* Handle the T7L66XB interrupt mux */
 186 static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
 187 {
 188         struct t7l66xb *t7l66xb = get_irq_data(irq);
 189         unsigned int isr;
 190         unsigned int i, irq_base;
 191
 192         irq_base = t7l66xb->irq_base;
 193
 194         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
 195                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
 196                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
 197                         if (isr & (1 << i))
 198                                 generic_handle_irq(irq_base + i);
 199 }
 200
 201 static void t7l66xb_irq_mask(unsigned int irq)
 202 {
 203         struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
 204         unsigned long                   flags;
 205         u8 imr;
 206
 207         spin_lock_irqsave(&t7l66xb->lock, flags);
 208         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 209         imr |= 1 << (irq - t7l66xb->irq_base);
 210         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 211         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 212 }
 213
 214 static void t7l66xb_irq_unmask(unsigned int irq)
 215 {
 216         struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
 217         unsigned long flags;
 218         u8 imr;
 219
 220         spin_lock_irqsave(&t7l66xb->lock, flags);
 221         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 222         imr &= ~(1 << (irq - t7l66xb->irq_base));
 223         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 224         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 225 }
 226
 227 static struct irq_chip t7l66xb_chip = {
 228         .name   = "t7l66xb",
 229         .ack    = t7l66xb_irq_mask,
 230         .mask   = t7l66xb_irq_mask,
 231         .unmask = t7l66xb_irq_unmask,
 232 };
 233
 234 /*--------------------------------------------------------------------------*/
 235
 236 /* Install the IRQ handler */
 237 static void t7l66xb_attach_irq(struct platform_device *dev)
 238 {
 239         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 240         unsigned int irq, irq_base;
 241
 242         irq_base = t7l66xb->irq_base;
 243
 244         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 245                 set_irq_chip(irq, &t7l66xb_chip);
 246                 set_irq_chip_data(irq, t7l66xb);
 247                 set_irq_handler(irq, handle_level_irq);
 248 #ifdef CONFIG_ARM
 249                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 250 #endif
 251         }
 252
 253         set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
 254         set_irq_data(t7l66xb->irq, t7l66xb);
 255         set_irq_chained_handler(t7l66xb->irq, t7l66xb_irq);
 256 }
 257
 258 static void t7l66xb_detach_irq(struct platform_device *dev)
 259 {
 260         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 261         unsigned int irq, irq_base;
 262
 263         irq_base = t7l66xb->irq_base;
 264
 265         set_irq_chained_handler(t7l66xb->irq, NULL);
 266         set_irq_data(t7l66xb->irq, NULL);
 267
 268         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 269 #ifdef CONFIG_ARM
 270                 set_irq_flags(irq, 0);
 271 #endif
 272                 set_irq_chip(irq, NULL);
 273                 set_irq_chip_data(irq, NULL);
 274         }
 275 }
 276
 277 /*--------------------------------------------------------------------------*/
 278
 279 #ifdef CONFIG_PM
 280 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
 281 {
 282         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 283         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 284
 285         if (pdata && pdata->suspend)
 286                 pdata->suspend(dev);
 287         clk_disable(t7l66xb->clk48m);
 288
 289         return 0;
 290 }
 291
 292 static int t7l66xb_resume(struct platform_device *dev)
 293 {
 294         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 295         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 296
 297         clk_enable(t7l66xb->clk48m);
 298         if (pdata && pdata->resume)
 299                 pdata->resume(dev);
 300
 301         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
 302                 t7l66xb_mmc_resources[0].start & 0xfffe);
 303
 304         return 0;
 305 }
 306 #else
 307 #define t7l66xb_suspend NULL
 308 #define t7l66xb_resume  NULL
 309 #endif
 310
 311 /*--------------------------------------------------------------------------*/
 312
 313 static int t7l66xb_probe(struct platform_device *dev)
 314 {
 315         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 316         struct t7l66xb *t7l66xb;
 317         struct resource *iomem, *rscr;
 318         int ret;
 319
 320         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 321         if (!iomem)
 322                 return -EINVAL;
 323
 324         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
 325         if (!t7l66xb)
 326                 return -ENOMEM;
 327
 328         spin_lock_init(&t7l66xb->lock);
 329
 330         platform_set_drvdata(dev, t7l66xb);
 331
 332         ret = platform_get_irq(dev, 0);
 333         if (ret >= 0)
 334                 t7l66xb->irq = ret;
 335         else
 336                 goto err_noirq;
 337
 338         t7l66xb->irq_base = pdata->irq_base;
 339
 340         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
 341         if (IS_ERR(t7l66xb->clk32k)) {
 342                 ret = PTR_ERR(t7l66xb->clk32k);
 343                 goto err_clk32k_get;
 344         }
 345
 346         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
 347         if (IS_ERR(t7l66xb->clk48m)) {
 348                 ret = PTR_ERR(t7l66xb->clk48m);
 349                 clk_put(t7l66xb->clk32k);
 350                 goto err_clk48m_get;
 351         }
 352
 353         rscr = &t7l66xb->rscr;
 354         rscr->name = "t7l66xb-core";
 355         rscr->start = iomem->start;
 356         rscr->end = iomem->start + 0xff;
 357         rscr->flags = IORESOURCE_MEM;
 358
 359         ret = request_resource(iomem, rscr);
 360         if (ret)
 361                 goto err_request_scr;
 362
 363         t7l66xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
 364         if (!t7l66xb->scr) {
 365                 ret = -ENOMEM;
 366                 goto err_ioremap;
 367         }
 368
 369         clk_enable(t7l66xb->clk48m);
 370
 371         if (pdata && pdata->enable)
 372                 pdata->enable(dev);
 373
 374         /* Mask all interrupts */
 375         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
 376
 377         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
 378                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
 379                 (unsigned long)iomem->start, t7l66xb->irq);
 380
 381         t7l66xb_attach_irq(dev);
 382
 383         t7l66xb_cells[T7L66XB_CELL_NAND].driver_data = pdata->nand_data;
 384         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data =
 385                 &t7l66xb_cells[T7L66XB_CELL_NAND];
 386         t7l66xb_cells[T7L66XB_CELL_NAND].data_size =
 387                 sizeof(t7l66xb_cells[T7L66XB_CELL_NAND]);
 388
 389         t7l66xb_cells[T7L66XB_CELL_MMC].platform_data =
 390                 &t7l66xb_cells[T7L66XB_CELL_MMC];
 391         t7l66xb_cells[T7L66XB_CELL_MMC].data_size =
 392                 sizeof(t7l66xb_cells[T7L66XB_CELL_MMC]);
 393
 394         ret = mfd_add_devices(&dev->dev, dev->id,
 395                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
 396                               iomem, t7l66xb->irq_base);
 397
 398         if (!ret)
 399                 return 0;
 400
 401         t7l66xb_detach_irq(dev);
 402         iounmap(t7l66xb->scr);
 403 err_ioremap:
 404         release_resource(&t7l66xb->rscr);
 405 err_request_scr:
 406         kfree(t7l66xb);
 407         clk_put(t7l66xb->clk48m);
 408 err_clk48m_get:
 409         clk_put(t7l66xb->clk32k);
 410 err_clk32k_get:
 411 err_noirq:
 412         return ret;
 413 }
 414
 415 static int t7l66xb_remove(struct platform_device *dev)
 416 {
 417         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 418         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 419         int ret;
 420
 421         ret = pdata->disable(dev);
 422         clk_disable(t7l66xb->clk48m);
 423         clk_put(t7l66xb->clk48m);
 424         t7l66xb_detach_irq(dev);
 425         iounmap(t7l66xb->scr);
 426         release_resource(&t7l66xb->rscr);
 427         mfd_remove_devices(&dev->dev);
 428         platform_set_drvdata(dev, NULL);
 429         kfree(t7l66xb);
 430
 431         return ret;
 432
 433 }
 434
 435 static struct platform_driver t7l66xb_platform_driver = {
 436         .driver = {
 437                 .name   = "t7l66xb",
 438                 .owner  = THIS_MODULE,
 439         },
 440         .suspend        = t7l66xb_suspend,
 441         .resume         = t7l66xb_resume,
 442         .probe          = t7l66xb_probe,
 443         .remove         = t7l66xb_remove,
 444 };
 445
 446 /*--------------------------------------------------------------------------*/
 447
 448 static int __init t7l66xb_init(void)
 449 {
 450         int retval = 0;
 451
 452         retval = platform_driver_register(&t7l66xb_platform_driver);
 453         return retval;
 454 }
 455
 456 static void __exit t7l66xb_exit(void)
 457 {
 458         platform_driver_unregister(&t7l66xb_platform_driver);
 459 }
 460
 461 module_init(t7l66xb_init);
 462 module_exit(t7l66xb_exit);
 463
 464 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 465 MODULE_LICENSE("GPL v2");
 466 MODULE_AUTHOR("Ian Molton");
 467 MODULE_ALIAS("platform:t7l66xb");