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/slab.h>
  30 #include <linux/irq.h>
  31 #include <linux/clk.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/mfd/core.h>
  34 #include <linux/mfd/tmio.h>
  35 #include <linux/mfd/t7l66xb.h>
  36
  37 enum {
  38         T7L66XB_CELL_NAND,
  39         T7L66XB_CELL_MMC,
  40 };
  41
  42 static const struct resource t7l66xb_mmc_resources[] = {
  43         {
  44                 .start = 0x800,
  45                 .end    = 0x9ff,
  46                 .flags = IORESOURCE_MEM,
  47         },
  48         {
  49                 .start = IRQ_T7L66XB_MMC,
  50                 .end    = IRQ_T7L66XB_MMC,
  51                 .flags = IORESOURCE_IRQ,
  52         },
  53 };
  54
  55 #define SCR_REVID       0x08            /* b Revision ID        */
  56 #define SCR_IMR         0x42            /* b Interrupt Mask     */
  57 #define SCR_DEV_CTL     0xe0            /* b Device control     */
  58 #define SCR_ISR         0xe1            /* b Interrupt Status   */
  59 #define SCR_GPO_OC      0xf0            /* b GPO output control */
  60 #define SCR_GPO_OS      0xf1            /* b GPO output enable  */
  61 #define SCR_GPI_S       0xf2            /* w GPI status         */
  62 #define SCR_APDC        0xf8            /* b Active pullup down ctrl */
  63
  64 #define SCR_DEV_CTL_USB         BIT(0)  /* USB enable           */
  65 #define SCR_DEV_CTL_MMC         BIT(1)  /* MMC enable           */
  66
  67 /*--------------------------------------------------------------------------*/
  68
  69 struct t7l66xb {
  70         void __iomem            *scr;
  71         /* Lock to protect registers requiring read/modify/write ops. */
  72         spinlock_t              lock;
  73
  74         struct resource         rscr;
  75         struct clk              *clk48m;
  76         struct clk              *clk32k;
  77         int                     irq;
  78         int                     irq_base;
  79 };
  80
  81 /*--------------------------------------------------------------------------*/
  82
  83 static int t7l66xb_mmc_enable(struct platform_device *mmc)
  84 {
  85         struct platform_device *dev = to_platform_device(mmc->dev.parent);
  86         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
  87         unsigned long flags;
  88         u8 dev_ctl;
  89
  90         clk_enable(t7l66xb->clk32k);
  91
  92         spin_lock_irqsave(&t7l66xb->lock, flags);
  93
  94         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
  95         dev_ctl |= SCR_DEV_CTL_MMC;
  96         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
  97
  98         spin_unlock_irqrestore(&t7l66xb->lock, flags);
  99
 100         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
 101                 t7l66xb_mmc_resources[0].start & 0xfffe);
 102
 103         return 0;
 104 }
 105
 106 static int t7l66xb_mmc_disable(struct platform_device *mmc)
 107 {
 108         struct platform_device *dev = to_platform_device(mmc->dev.parent);
 109         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 110         unsigned long flags;
 111         u8 dev_ctl;
 112
 113         spin_lock_irqsave(&t7l66xb->lock, flags);
 114
 115         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
 116         dev_ctl &= ~SCR_DEV_CTL_MMC;
 117         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
 118
 119         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 120
 121         clk_disable(t7l66xb->clk32k);
 122
 123         return 0;
 124 }
 125
 126 static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
 127 {
 128         struct platform_device *dev = to_platform_device(mmc->dev.parent);
 129         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 130
 131         tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
 132 }
 133
 134 static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
 135 {
 136         struct platform_device *dev = to_platform_device(mmc->dev.parent);
 137         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 138
 139         tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
 140 }
 141
 142 /*--------------------------------------------------------------------------*/
 143
 144 static struct tmio_mmc_data t7166xb_mmc_data = {
 145         .hclk = 24000000,
 146         .set_pwr = t7l66xb_mmc_pwr,
 147         .set_clk_div = t7l66xb_mmc_clk_div,
 148 };
 149
 150 static const struct resource t7l66xb_nand_resources[] = {
 151         {
 152                 .start  = 0xc00,
 153                 .end    = 0xc07,
 154                 .flags  = IORESOURCE_MEM,
 155         },
 156         {
 157                 .start  = 0x0100,
 158                 .end    = 0x01ff,
 159                 .flags  = IORESOURCE_MEM,
 160         },
 161         {
 162                 .start  = IRQ_T7L66XB_NAND,
 163                 .end    = IRQ_T7L66XB_NAND,
 164                 .flags  = IORESOURCE_IRQ,
 165         },
 166 };
 167
 168 static struct mfd_cell t7l66xb_cells[] = {
 169         [T7L66XB_CELL_MMC] = {
 170                 .name = "tmio-mmc",
 171                 .enable = t7l66xb_mmc_enable,
 172                 .disable = t7l66xb_mmc_disable,
 173                 .mfd_data = &t7166xb_mmc_data,
 174                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
 175                 .resources = t7l66xb_mmc_resources,
 176         },
 177         [T7L66XB_CELL_NAND] = {
 178                 .name = "tmio-nand",
 179                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
 180                 .resources = t7l66xb_nand_resources,
 181         },
 182 };
 183
 184 /*--------------------------------------------------------------------------*/
 185
 186 /* Handle the T7L66XB interrupt mux */
 187 static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
 188 {
 189         struct t7l66xb *t7l66xb = irq_get_handler_data(irq);
 190         unsigned int isr;
 191         unsigned int i, irq_base;
 192
 193         irq_base = t7l66xb->irq_base;
 194
 195         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
 196                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
 197                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
 198                         if (isr & (1 << i))
 199                                 generic_handle_irq(irq_base + i);
 200 }
 201
 202 static void t7l66xb_irq_mask(struct irq_data *data)
 203 {
 204         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
 205         unsigned long                   flags;
 206         u8 imr;
 207
 208         spin_lock_irqsave(&t7l66xb->lock, flags);
 209         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 210         imr |= 1 << (data->irq - t7l66xb->irq_base);
 211         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 212         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 213 }
 214
 215 static void t7l66xb_irq_unmask(struct irq_data *data)
 216 {
 217         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
 218         unsigned long flags;
 219         u8 imr;
 220
 221         spin_lock_irqsave(&t7l66xb->lock, flags);
 222         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 223         imr &= ~(1 << (data->irq - t7l66xb->irq_base));
 224         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 225         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 226 }
 227
 228 static struct irq_chip t7l66xb_chip = {
 229         .name           = "t7l66xb",
 230         .irq_ack        = t7l66xb_irq_mask,
 231         .irq_mask       = t7l66xb_irq_mask,
 232         .irq_unmask     = t7l66xb_irq_unmask,
 233 };
 234
 235 /*--------------------------------------------------------------------------*/
 236
 237 /* Install the IRQ handler */
 238 static void t7l66xb_attach_irq(struct platform_device *dev)
 239 {
 240         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 241         unsigned int irq, irq_base;
 242
 243         irq_base = t7l66xb->irq_base;
 244
 245         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 246                 irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
 247                 irq_set_chip_data(irq, t7l66xb);
 248 #ifdef CONFIG_ARM
 249                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 250 #endif
 251         }
 252
 253         irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
 254         irq_set_handler_data(t7l66xb->irq, t7l66xb);
 255         irq_set_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         irq_set_chained_handler(t7l66xb->irq, NULL);
 266         irq_set_handler_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                 irq_set_chip(irq, NULL);
 273                 irq_set_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         if (pdata == NULL)
 321                 return -EINVAL;
 322
 323         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 324         if (!iomem)
 325                 return -EINVAL;
 326
 327         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
 328         if (!t7l66xb)
 329                 return -ENOMEM;
 330
 331         spin_lock_init(&t7l66xb->lock);
 332
 333         platform_set_drvdata(dev, t7l66xb);
 334
 335         ret = platform_get_irq(dev, 0);
 336         if (ret >= 0)
 337                 t7l66xb->irq = ret;
 338         else
 339                 goto err_noirq;
 340
 341         t7l66xb->irq_base = pdata->irq_base;
 342
 343         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
 344         if (IS_ERR(t7l66xb->clk32k)) {
 345                 ret = PTR_ERR(t7l66xb->clk32k);
 346                 goto err_clk32k_get;
 347         }
 348
 349         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
 350         if (IS_ERR(t7l66xb->clk48m)) {
 351                 ret = PTR_ERR(t7l66xb->clk48m);
 352                 goto err_clk48m_get;
 353         }
 354
 355         rscr = &t7l66xb->rscr;
 356         rscr->name = "t7l66xb-core";
 357         rscr->start = iomem->start;
 358         rscr->end = iomem->start + 0xff;
 359         rscr->flags = IORESOURCE_MEM;
 360
 361         ret = request_resource(iomem, rscr);
 362         if (ret)
 363                 goto err_request_scr;
 364
 365         t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
 366         if (!t7l66xb->scr) {
 367                 ret = -ENOMEM;
 368                 goto err_ioremap;
 369         }
 370
 371         clk_enable(t7l66xb->clk48m);
 372
 373         if (pdata && pdata->enable)
 374                 pdata->enable(dev);
 375
 376         /* Mask all interrupts */
 377         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
 378
 379         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
 380                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
 381                 (unsigned long)iomem->start, t7l66xb->irq);
 382
 383         t7l66xb_attach_irq(dev);
 384
 385         t7l66xb_cells[T7L66XB_CELL_NAND].mfd_data = pdata->nand_data;
 386
 387         ret = mfd_add_devices(&dev->dev, dev->id,
 388                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
 389                               iomem, t7l66xb->irq_base);
 390
 391         if (!ret)
 392                 return 0;
 393
 394         t7l66xb_detach_irq(dev);
 395         iounmap(t7l66xb->scr);
 396 err_ioremap:
 397         release_resource(&t7l66xb->rscr);
 398 err_request_scr:
 399         clk_put(t7l66xb->clk48m);
 400 err_clk48m_get:
 401         clk_put(t7l66xb->clk32k);
 402 err_clk32k_get:
 403 err_noirq:
 404         kfree(t7l66xb);
 405         return ret;
 406 }
 407
 408 static int t7l66xb_remove(struct platform_device *dev)
 409 {
 410         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 411         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 412         int ret;
 413
 414         ret = pdata->disable(dev);
 415         clk_disable(t7l66xb->clk48m);
 416         clk_put(t7l66xb->clk48m);
 417         clk_disable(t7l66xb->clk32k);
 418         clk_put(t7l66xb->clk32k);
 419         t7l66xb_detach_irq(dev);
 420         iounmap(t7l66xb->scr);
 421         release_resource(&t7l66xb->rscr);
 422         mfd_remove_devices(&dev->dev);
 423         platform_set_drvdata(dev, NULL);
 424         kfree(t7l66xb);
 425
 426         return ret;
 427
 428 }
 429
 430 static struct platform_driver t7l66xb_platform_driver = {
 431         .driver = {
 432                 .name   = "t7l66xb",
 433                 .owner  = THIS_MODULE,
 434         },
 435         .suspend        = t7l66xb_suspend,
 436         .resume         = t7l66xb_resume,
 437         .probe          = t7l66xb_probe,
 438         .remove         = t7l66xb_remove,
 439 };
 440
 441 /*--------------------------------------------------------------------------*/
 442
 443 static int __init t7l66xb_init(void)
 444 {
 445         int retval = 0;
 446
 447         retval = platform_driver_register(&t7l66xb_platform_driver);
 448         return retval;
 449 }
 450
 451 static void __exit t7l66xb_exit(void)
 452 {
 453         platform_driver_unregister(&t7l66xb_platform_driver);
 454 }
 455
 456 module_init(t7l66xb_init);
 457 module_exit(t7l66xb_exit);
 458
 459 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 460 MODULE_LICENSE("GPL v2");
 461 MODULE_AUTHOR("Ian Molton");
 462 MODULE_ALIAS("platform:t7l66xb");