SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 const static struct resource t7l66xb_mmc_resources[] = {
 112         {
 113                 .start = 0x800,
 114                 .end    = 0x9ff,
 115                 .flags = IORESOURCE_MEM,
 116         },
 117         {
 118                 .start = 0x200,
 119                 .end    = 0x2ff,
 120                 .flags = IORESOURCE_MEM,
 121         },
 122         {
 123                 .start = IRQ_T7L66XB_MMC,
 124                 .end    = IRQ_T7L66XB_MMC,
 125                 .flags = IORESOURCE_IRQ,
 126         },
 127 };
 128
 129 const static struct resource t7l66xb_nand_resources[] = {
 130         {
 131                 .start  = 0xc00,
 132                 .end    = 0xc07,
 133                 .flags  = IORESOURCE_MEM,
 134         },
 135         {
 136                 .start  = 0x0100,
 137                 .end    = 0x01ff,
 138                 .flags  = IORESOURCE_MEM,
 139         },
 140         {
 141                 .start  = IRQ_T7L66XB_NAND,
 142                 .end    = IRQ_T7L66XB_NAND,
 143                 .flags  = IORESOURCE_IRQ,
 144         },
 145 };
 146
 147 static struct mfd_cell t7l66xb_cells[] = {
 148         [T7L66XB_CELL_MMC] = {
 149                 .name = "tmio-mmc",
 150                 .enable = t7l66xb_mmc_enable,
 151                 .disable = t7l66xb_mmc_disable,
 152                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
 153                 .resources = t7l66xb_mmc_resources,
 154         },
 155         [T7L66XB_CELL_NAND] = {
 156                 .name = "tmio-nand",
 157                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
 158                 .resources = t7l66xb_nand_resources,
 159         },
 160 };
 161
 162 /*--------------------------------------------------------------------------*/
 163
 164 /* Handle the T7L66XB interrupt mux */
 165 static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
 166 {
 167         struct t7l66xb *t7l66xb = get_irq_data(irq);
 168         unsigned int isr;
 169         unsigned int i, irq_base;
 170
 171         irq_base = t7l66xb->irq_base;
 172
 173         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
 174                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
 175                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
 176                         if (isr & (1 << i))
 177                                 generic_handle_irq(irq_base + i);
 178 }
 179
 180 static void t7l66xb_irq_mask(unsigned int irq)
 181 {
 182         struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
 183         unsigned long                   flags;
 184         u8 imr;
 185
 186         spin_lock_irqsave(&t7l66xb->lock, flags);
 187         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 188         imr |= 1 << (irq - t7l66xb->irq_base);
 189         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 190         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 191 }
 192
 193 static void t7l66xb_irq_unmask(unsigned int irq)
 194 {
 195         struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
 196         unsigned long flags;
 197         u8 imr;
 198
 199         spin_lock_irqsave(&t7l66xb->lock, flags);
 200         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 201         imr &= ~(1 << (irq - t7l66xb->irq_base));
 202         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 203         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 204 }
 205
 206 static struct irq_chip t7l66xb_chip = {
 207         .name   = "t7l66xb",
 208         .ack    = t7l66xb_irq_mask,
 209         .mask   = t7l66xb_irq_mask,
 210         .unmask = t7l66xb_irq_unmask,
 211 };
 212
 213 /*--------------------------------------------------------------------------*/
 214
 215 /* Install the IRQ handler */
 216 static void t7l66xb_attach_irq(struct platform_device *dev)
 217 {
 218         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 219         unsigned int irq, irq_base;
 220
 221         irq_base = t7l66xb->irq_base;
 222
 223         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 224                 set_irq_chip(irq, &t7l66xb_chip);
 225                 set_irq_chip_data(irq, t7l66xb);
 226                 set_irq_handler(irq, handle_level_irq);
 227 #ifdef CONFIG_ARM
 228                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 229 #endif
 230         }
 231
 232         set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
 233         set_irq_data(t7l66xb->irq, t7l66xb);
 234         set_irq_chained_handler(t7l66xb->irq, t7l66xb_irq);
 235 }
 236
 237 static void t7l66xb_detach_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         set_irq_chained_handler(t7l66xb->irq, NULL);
 245         set_irq_data(t7l66xb->irq, NULL);
 246
 247         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 248 #ifdef CONFIG_ARM
 249                 set_irq_flags(irq, 0);
 250 #endif
 251                 set_irq_chip(irq, NULL);
 252                 set_irq_chip_data(irq, NULL);
 253         }
 254 }
 255
 256 /*--------------------------------------------------------------------------*/
 257
 258 #ifdef CONFIG_PM
 259 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
 260 {
 261         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 262         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 263
 264         if (pdata && pdata->suspend)
 265                 pdata->suspend(dev);
 266         clk_disable(t7l66xb->clk48m);
 267
 268         return 0;
 269 }
 270
 271 static int t7l66xb_resume(struct platform_device *dev)
 272 {
 273         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 274         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 275
 276         clk_enable(t7l66xb->clk48m);
 277         if (pdata && pdata->resume)
 278                 pdata->resume(dev);
 279
 280         return 0;
 281 }
 282 #else
 283 #define t7l66xb_suspend NULL
 284 #define t7l66xb_resume  NULL
 285 #endif
 286
 287 /*--------------------------------------------------------------------------*/
 288
 289 static int t7l66xb_probe(struct platform_device *dev)
 290 {
 291         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 292         struct t7l66xb *t7l66xb;
 293         struct resource *iomem, *rscr;
 294         int ret;
 295
 296         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 297         if (!iomem)
 298                 return -EINVAL;
 299
 300         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
 301         if (!t7l66xb)
 302                 return -ENOMEM;
 303
 304         spin_lock_init(&t7l66xb->lock);
 305
 306         platform_set_drvdata(dev, t7l66xb);
 307
 308         ret = platform_get_irq(dev, 0);
 309         if (ret >= 0)
 310                 t7l66xb->irq = ret;
 311         else
 312                 goto err_noirq;
 313
 314         t7l66xb->irq_base = pdata->irq_base;
 315
 316         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
 317         if (IS_ERR(t7l66xb->clk32k)) {
 318                 ret = PTR_ERR(t7l66xb->clk32k);
 319                 goto err_clk32k_get;
 320         }
 321
 322         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
 323         if (IS_ERR(t7l66xb->clk48m)) {
 324                 ret = PTR_ERR(t7l66xb->clk48m);
 325                 clk_put(t7l66xb->clk32k);
 326                 goto err_clk48m_get;
 327         }
 328
 329         rscr = &t7l66xb->rscr;
 330         rscr->name = "t7l66xb-core";
 331         rscr->start = iomem->start;
 332         rscr->end = iomem->start + 0xff;
 333         rscr->flags = IORESOURCE_MEM;
 334
 335         ret = request_resource(iomem, rscr);
 336         if (ret)
 337                 goto err_request_scr;
 338
 339         t7l66xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
 340         if (!t7l66xb->scr) {
 341                 ret = -ENOMEM;
 342                 goto err_ioremap;
 343         }
 344
 345         clk_enable(t7l66xb->clk48m);
 346
 347         if (pdata && pdata->enable)
 348                 pdata->enable(dev);
 349
 350         /* Mask all interrupts */
 351         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
 352
 353         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
 354                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
 355                 (unsigned long)iomem->start, t7l66xb->irq);
 356
 357         t7l66xb_attach_irq(dev);
 358
 359         t7l66xb_cells[T7L66XB_CELL_NAND].driver_data = pdata->nand_data;
 360         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data =
 361                 &t7l66xb_cells[T7L66XB_CELL_NAND];
 362         t7l66xb_cells[T7L66XB_CELL_NAND].data_size =
 363                 sizeof(t7l66xb_cells[T7L66XB_CELL_NAND]);
 364
 365         t7l66xb_cells[T7L66XB_CELL_MMC].platform_data =
 366                 &t7l66xb_cells[T7L66XB_CELL_MMC];
 367         t7l66xb_cells[T7L66XB_CELL_MMC].data_size =
 368                 sizeof(t7l66xb_cells[T7L66XB_CELL_MMC]);
 369
 370         ret = mfd_add_devices(&dev->dev, dev->id,
 371                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
 372                               iomem, t7l66xb->irq_base);
 373
 374         if (!ret)
 375                 return 0;
 376
 377         t7l66xb_detach_irq(dev);
 378         iounmap(t7l66xb->scr);
 379 err_ioremap:
 380         release_resource(&t7l66xb->rscr);
 381 err_request_scr:
 382         kfree(t7l66xb);
 383         clk_put(t7l66xb->clk48m);
 384 err_clk48m_get:
 385         clk_put(t7l66xb->clk32k);
 386 err_clk32k_get:
 387 err_noirq:
 388         return ret;
 389 }
 390
 391 static int t7l66xb_remove(struct platform_device *dev)
 392 {
 393         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 394         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 395         int ret;
 396
 397         ret = pdata->disable(dev);
 398         clk_disable(t7l66xb->clk48m);
 399         clk_put(t7l66xb->clk48m);
 400         t7l66xb_detach_irq(dev);
 401         iounmap(t7l66xb->scr);
 402         release_resource(&t7l66xb->rscr);
 403         mfd_remove_devices(&dev->dev);
 404         platform_set_drvdata(dev, NULL);
 405         kfree(t7l66xb);
 406
 407         return ret;
 408
 409 }
 410
 411 static struct platform_driver t7l66xb_platform_driver = {
 412         .driver = {
 413                 .name   = "t7l66xb",
 414                 .owner  = THIS_MODULE,
 415         },
 416         .suspend        = t7l66xb_suspend,
 417         .resume         = t7l66xb_resume,
 418         .probe          = t7l66xb_probe,
 419         .remove         = t7l66xb_remove,
 420 };
 421
 422 /*--------------------------------------------------------------------------*/
 423
 424 static int __init t7l66xb_init(void)
 425 {
 426         int retval = 0;
 427
 428         retval = platform_driver_register(&t7l66xb_platform_driver);
 429         return retval;
 430 }
 431
 432 static void __exit t7l66xb_exit(void)
 433 {
 434         platform_driver_unregister(&t7l66xb_platform_driver);
 435 }
 436
 437 module_init(t7l66xb_init);
 438 module_exit(t7l66xb_exit);
 439
 440 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 441 MODULE_LICENSE("GPL v2");
 442 MODULE_AUTHOR("Ian Molton");
 443 MODULE_ALIAS("platform:t7l66xb");