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 #define SCR_REVID       0x08            /* b Revision ID        */
  42 #define SCR_IMR         0x42            /* b Interrupt Mask     */
  43 #define SCR_DEV_CTL     0xe0            /* b Device control     */
  44 #define SCR_ISR         0xe1            /* b Interrupt Status   */
  45 #define SCR_GPO_OC      0xf0            /* b GPO output control */
  46 #define SCR_GPO_OS      0xf1            /* b GPO output enable  */
  47 #define SCR_GPI_S       0xf2            /* w GPI status         */
  48 #define SCR_APDC        0xf8            /* b Active pullup down ctrl */
  49
  50 #define SCR_DEV_CTL_USB         BIT(0)  /* USB enable           */
  51 #define SCR_DEV_CTL_MMC         BIT(1)  /* MMC enable           */
  52
  53 /*--------------------------------------------------------------------------*/
  54
  55 struct t7l66xb {
  56         void __iomem            *scr;
  57         /* Lock to protect registers requiring read/modify/write ops. */
  58         spinlock_t              lock;
  59
  60         struct resource         rscr;
  61         struct clk              *clk48m;
  62         struct clk              *clk32k;
  63         int                     irq;
  64         int                     irq_base;
  65 };
  66
  67 /*--------------------------------------------------------------------------*/
  68
  69 static int t7l66xb_mmc_enable(struct platform_device *mmc)
  70 {
  71         struct platform_device *dev = to_platform_device(mmc->dev.parent);
  72         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
  73         unsigned long flags;
  74         u8 dev_ctl;
  75
  76         clk_enable(t7l66xb->clk32k);
  77
  78         spin_lock_irqsave(&t7l66xb->lock, flags);
  79
  80         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
  81         dev_ctl |= SCR_DEV_CTL_MMC;
  82         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
  83
  84         spin_unlock_irqrestore(&t7l66xb->lock, flags);
  85
  86         return 0;
  87 }
  88
  89 static int t7l66xb_mmc_disable(struct platform_device *mmc)
  90 {
  91         struct platform_device *dev = to_platform_device(mmc->dev.parent);
  92         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
  93         unsigned long flags;
  94         u8 dev_ctl;
  95
  96         spin_lock_irqsave(&t7l66xb->lock, flags);
  97
  98         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
  99         dev_ctl &= ~SCR_DEV_CTL_MMC;
 100         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
 101
 102         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 103
 104         clk_disable(t7l66xb->clk32k);
 105
 106         return 0;
 107 }
 108
 109 /*--------------------------------------------------------------------------*/
 110
 111 static struct tmio_mmc_data t7166xb_mmc_data = {
 112         .hclk = 24000000,
 113 };
 114
 115 static const struct resource t7l66xb_mmc_resources[] = {
 116         {
 117                 .start = 0x800,
 118                 .end    = 0x9ff,
 119                 .flags = IORESOURCE_MEM,
 120         },
 121         {
 122                 .start = 0x200,
 123                 .end    = 0x2ff,
 124                 .flags = IORESOURCE_MEM,
 125         },
 126         {
 127                 .start = IRQ_T7L66XB_MMC,
 128                 .end    = IRQ_T7L66XB_MMC,
 129                 .flags = IORESOURCE_IRQ,
 130         },
 131 };
 132
 133 static const struct resource t7l66xb_nand_resources[] = {
 134         {
 135                 .start  = 0xc00,
 136                 .end    = 0xc07,
 137                 .flags  = IORESOURCE_MEM,
 138         },
 139         {
 140                 .start  = 0x0100,
 141                 .end    = 0x01ff,
 142                 .flags  = IORESOURCE_MEM,
 143         },
 144         {
 145                 .start  = IRQ_T7L66XB_NAND,
 146                 .end    = IRQ_T7L66XB_NAND,
 147                 .flags  = IORESOURCE_IRQ,
 148         },
 149 };
 150
 151 static struct mfd_cell t7l66xb_cells[] = {
 152         [T7L66XB_CELL_MMC] = {
 153                 .name = "tmio-mmc",
 154                 .enable = t7l66xb_mmc_enable,
 155                 .disable = t7l66xb_mmc_disable,
 156                 .driver_data = &t7166xb_mmc_data,
 157                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
 158                 .resources = t7l66xb_mmc_resources,
 159         },
 160         [T7L66XB_CELL_NAND] = {
 161                 .name = "tmio-nand",
 162                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
 163                 .resources = t7l66xb_nand_resources,
 164         },
 165 };
 166
 167 /*--------------------------------------------------------------------------*/
 168
 169 /* Handle the T7L66XB interrupt mux */
 170 static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
 171 {
 172         struct t7l66xb *t7l66xb = get_irq_data(irq);
 173         unsigned int isr;
 174         unsigned int i, irq_base;
 175
 176         irq_base = t7l66xb->irq_base;
 177
 178         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
 179                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
 180                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
 181                         if (isr & (1 << i))
 182                                 generic_handle_irq(irq_base + i);
 183 }
 184
 185 static void t7l66xb_irq_mask(unsigned int irq)
 186 {
 187         struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
 188         unsigned long                   flags;
 189         u8 imr;
 190
 191         spin_lock_irqsave(&t7l66xb->lock, flags);
 192         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 193         imr |= 1 << (irq - t7l66xb->irq_base);
 194         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 195         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 196 }
 197
 198 static void t7l66xb_irq_unmask(unsigned int irq)
 199 {
 200         struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
 201         unsigned long flags;
 202         u8 imr;
 203
 204         spin_lock_irqsave(&t7l66xb->lock, flags);
 205         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 206         imr &= ~(1 << (irq - t7l66xb->irq_base));
 207         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 208         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 209 }
 210
 211 static struct irq_chip t7l66xb_chip = {
 212         .name   = "t7l66xb",
 213         .ack    = t7l66xb_irq_mask,
 214         .mask   = t7l66xb_irq_mask,
 215         .unmask = t7l66xb_irq_unmask,
 216 };
 217
 218 /*--------------------------------------------------------------------------*/
 219
 220 /* Install the IRQ handler */
 221 static void t7l66xb_attach_irq(struct platform_device *dev)
 222 {
 223         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 224         unsigned int irq, irq_base;
 225
 226         irq_base = t7l66xb->irq_base;
 227
 228         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 229                 set_irq_chip(irq, &t7l66xb_chip);
 230                 set_irq_chip_data(irq, t7l66xb);
 231                 set_irq_handler(irq, handle_level_irq);
 232 #ifdef CONFIG_ARM
 233                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 234 #endif
 235         }
 236
 237         set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
 238         set_irq_data(t7l66xb->irq, t7l66xb);
 239         set_irq_chained_handler(t7l66xb->irq, t7l66xb_irq);
 240 }
 241
 242 static void t7l66xb_detach_irq(struct platform_device *dev)
 243 {
 244         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 245         unsigned int irq, irq_base;
 246
 247         irq_base = t7l66xb->irq_base;
 248
 249         set_irq_chained_handler(t7l66xb->irq, NULL);
 250         set_irq_data(t7l66xb->irq, NULL);
 251
 252         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 253 #ifdef CONFIG_ARM
 254                 set_irq_flags(irq, 0);
 255 #endif
 256                 set_irq_chip(irq, NULL);
 257                 set_irq_chip_data(irq, NULL);
 258         }
 259 }
 260
 261 /*--------------------------------------------------------------------------*/
 262
 263 #ifdef CONFIG_PM
 264 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
 265 {
 266         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 267         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 268
 269         if (pdata && pdata->suspend)
 270                 pdata->suspend(dev);
 271         clk_disable(t7l66xb->clk48m);
 272
 273         return 0;
 274 }
 275
 276 static int t7l66xb_resume(struct platform_device *dev)
 277 {
 278         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 279         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 280
 281         clk_enable(t7l66xb->clk48m);
 282         if (pdata && pdata->resume)
 283                 pdata->resume(dev);
 284
 285         return 0;
 286 }
 287 #else
 288 #define t7l66xb_suspend NULL
 289 #define t7l66xb_resume  NULL
 290 #endif
 291
 292 /*--------------------------------------------------------------------------*/
 293
 294 static int t7l66xb_probe(struct platform_device *dev)
 295 {
 296         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 297         struct t7l66xb *t7l66xb;
 298         struct resource *iomem, *rscr;
 299         int ret;
 300
 301         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 302         if (!iomem)
 303                 return -EINVAL;
 304
 305         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
 306         if (!t7l66xb)
 307                 return -ENOMEM;
 308
 309         spin_lock_init(&t7l66xb->lock);
 310
 311         platform_set_drvdata(dev, t7l66xb);
 312
 313         ret = platform_get_irq(dev, 0);
 314         if (ret >= 0)
 315                 t7l66xb->irq = ret;
 316         else
 317                 goto err_noirq;
 318
 319         t7l66xb->irq_base = pdata->irq_base;
 320
 321         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
 322         if (IS_ERR(t7l66xb->clk32k)) {
 323                 ret = PTR_ERR(t7l66xb->clk32k);
 324                 goto err_clk32k_get;
 325         }
 326
 327         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
 328         if (IS_ERR(t7l66xb->clk48m)) {
 329                 ret = PTR_ERR(t7l66xb->clk48m);
 330                 clk_put(t7l66xb->clk32k);
 331                 goto err_clk48m_get;
 332         }
 333
 334         rscr = &t7l66xb->rscr;
 335         rscr->name = "t7l66xb-core";
 336         rscr->start = iomem->start;
 337         rscr->end = iomem->start + 0xff;
 338         rscr->flags = IORESOURCE_MEM;
 339
 340         ret = request_resource(iomem, rscr);
 341         if (ret)
 342                 goto err_request_scr;
 343
 344         t7l66xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
 345         if (!t7l66xb->scr) {
 346                 ret = -ENOMEM;
 347                 goto err_ioremap;
 348         }
 349
 350         clk_enable(t7l66xb->clk48m);
 351
 352         if (pdata && pdata->enable)
 353                 pdata->enable(dev);
 354
 355         /* Mask all interrupts */
 356         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
 357
 358         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
 359                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
 360                 (unsigned long)iomem->start, t7l66xb->irq);
 361
 362         t7l66xb_attach_irq(dev);
 363
 364         t7l66xb_cells[T7L66XB_CELL_NAND].driver_data = pdata->nand_data;
 365         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data =
 366                 &t7l66xb_cells[T7L66XB_CELL_NAND];
 367         t7l66xb_cells[T7L66XB_CELL_NAND].data_size =
 368                 sizeof(t7l66xb_cells[T7L66XB_CELL_NAND]);
 369
 370         t7l66xb_cells[T7L66XB_CELL_MMC].platform_data =
 371                 &t7l66xb_cells[T7L66XB_CELL_MMC];
 372         t7l66xb_cells[T7L66XB_CELL_MMC].data_size =
 373                 sizeof(t7l66xb_cells[T7L66XB_CELL_MMC]);
 374
 375         ret = mfd_add_devices(&dev->dev, dev->id,
 376                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
 377                               iomem, t7l66xb->irq_base);
 378
 379         if (!ret)
 380                 return 0;
 381
 382         t7l66xb_detach_irq(dev);
 383         iounmap(t7l66xb->scr);
 384 err_ioremap:
 385         release_resource(&t7l66xb->rscr);
 386 err_request_scr:
 387         kfree(t7l66xb);
 388         clk_put(t7l66xb->clk48m);
 389 err_clk48m_get:
 390         clk_put(t7l66xb->clk32k);
 391 err_clk32k_get:
 392 err_noirq:
 393         return ret;
 394 }
 395
 396 static int t7l66xb_remove(struct platform_device *dev)
 397 {
 398         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 399         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 400         int ret;
 401
 402         ret = pdata->disable(dev);
 403         clk_disable(t7l66xb->clk48m);
 404         clk_put(t7l66xb->clk48m);
 405         t7l66xb_detach_irq(dev);
 406         iounmap(t7l66xb->scr);
 407         release_resource(&t7l66xb->rscr);
 408         mfd_remove_devices(&dev->dev);
 409         platform_set_drvdata(dev, NULL);
 410         kfree(t7l66xb);
 411
 412         return ret;
 413
 414 }
 415
 416 static struct platform_driver t7l66xb_platform_driver = {
 417         .driver = {
 418                 .name   = "t7l66xb",
 419                 .owner  = THIS_MODULE,
 420         },
 421         .suspend        = t7l66xb_suspend,
 422         .resume         = t7l66xb_resume,
 423         .probe          = t7l66xb_probe,
 424         .remove         = t7l66xb_remove,
 425 };
 426
 427 /*--------------------------------------------------------------------------*/
 428
 429 static int __init t7l66xb_init(void)
 430 {
 431         int retval = 0;
 432
 433         retval = platform_driver_register(&t7l66xb_platform_driver);
 434         return retval;
 435 }
 436
 437 static void __exit t7l66xb_exit(void)
 438 {
 439         platform_driver_unregister(&t7l66xb_platform_driver);
 440 }
 441
 442 module_init(t7l66xb_init);
 443 module_exit(t7l66xb_exit);
 444
 445 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 446 MODULE_LICENSE("GPL v2");
 447 MODULE_AUTHOR("Ian Molton");
 448 MODULE_ALIAS("platform:t7l66xb");