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         raw_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         int ret;
  90
  91         ret = clk_prepare_enable(t7l66xb->clk32k);
  92         if (ret)
  93                 return ret;
  94
  95         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
  96
  97         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
  98         dev_ctl |= SCR_DEV_CTL_MMC;
  99         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
 100
 101         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
 102
 103         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
 104                 t7l66xb_mmc_resources[0].start & 0xfffe);
 105
 106         return 0;
 107 }
 108
 109 static int t7l66xb_mmc_disable(struct platform_device *mmc)
 110 {
 111         struct platform_device *dev = to_platform_device(mmc->dev.parent);
 112         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 113         unsigned long flags;
 114         u8 dev_ctl;
 115
 116         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
 117
 118         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
 119         dev_ctl &= ~SCR_DEV_CTL_MMC;
 120         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
 121
 122         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
 123
 124         clk_disable_unprepare(t7l66xb->clk32k);
 125
 126         return 0;
 127 }
 128
 129 static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
 130 {
 131         struct platform_device *dev = to_platform_device(mmc->dev.parent);
 132         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 133
 134         tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
 135 }
 136
 137 static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
 138 {
 139         struct platform_device *dev = to_platform_device(mmc->dev.parent);
 140         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 141
 142         tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
 143 }
 144
 145 /*--------------------------------------------------------------------------*/
 146
 147 static struct tmio_mmc_data t7166xb_mmc_data = {
 148         .hclk = 24000000,
 149         .set_pwr = t7l66xb_mmc_pwr,
 150         .set_clk_div = t7l66xb_mmc_clk_div,
 151 };
 152
 153 static const struct resource t7l66xb_nand_resources[] = {
 154         {
 155                 .start  = 0xc00,
 156                 .end    = 0xc07,
 157                 .flags  = IORESOURCE_MEM,
 158         },
 159         {
 160                 .start  = 0x0100,
 161                 .end    = 0x01ff,
 162                 .flags  = IORESOURCE_MEM,
 163         },
 164         {
 165                 .start  = IRQ_T7L66XB_NAND,
 166                 .end    = IRQ_T7L66XB_NAND,
 167                 .flags  = IORESOURCE_IRQ,
 168         },
 169 };
 170
 171 static struct mfd_cell t7l66xb_cells[] = {
 172         [T7L66XB_CELL_MMC] = {
 173                 .name = "tmio-mmc",
 174                 .enable = t7l66xb_mmc_enable,
 175                 .disable = t7l66xb_mmc_disable,
 176                 .platform_data = &t7166xb_mmc_data,
 177                 .pdata_size    = sizeof(t7166xb_mmc_data),
 178                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
 179                 .resources = t7l66xb_mmc_resources,
 180         },
 181         [T7L66XB_CELL_NAND] = {
 182                 .name = "tmio-nand",
 183                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
 184                 .resources = t7l66xb_nand_resources,
 185         },
 186 };
 187
 188 /*--------------------------------------------------------------------------*/
 189
 190 /* Handle the T7L66XB interrupt mux */
 191 static void t7l66xb_irq(struct irq_desc *desc)
 192 {
 193         struct t7l66xb *t7l66xb = irq_desc_get_handler_data(desc);
 194         unsigned int isr;
 195         unsigned int i, irq_base;
 196
 197         irq_base = t7l66xb->irq_base;
 198
 199         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
 200                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
 201                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
 202                         if (isr & (1 << i))
 203                                 generic_handle_irq(irq_base + i);
 204 }
 205
 206 static void t7l66xb_irq_mask(struct irq_data *data)
 207 {
 208         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
 209         unsigned long                   flags;
 210         u8 imr;
 211
 212         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
 213         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 214         imr |= 1 << (data->irq - t7l66xb->irq_base);
 215         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 216         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
 217 }
 218
 219 static void t7l66xb_irq_unmask(struct irq_data *data)
 220 {
 221         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
 222         unsigned long flags;
 223         u8 imr;
 224
 225         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
 226         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 227         imr &= ~(1 << (data->irq - t7l66xb->irq_base));
 228         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 229         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
 230 }
 231
 232 static struct irq_chip t7l66xb_chip = {
 233         .name           = "t7l66xb",
 234         .irq_ack        = t7l66xb_irq_mask,
 235         .irq_mask       = t7l66xb_irq_mask,
 236         .irq_unmask     = t7l66xb_irq_unmask,
 237 };
 238
 239 /*--------------------------------------------------------------------------*/
 240
 241 /* Install the IRQ handler */
 242 static void t7l66xb_attach_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         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 250                 irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
 251                 irq_set_chip_data(irq, t7l66xb);
 252         }
 253
 254         irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
 255         irq_set_chained_handler_and_data(t7l66xb->irq, t7l66xb_irq, t7l66xb);
 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_and_data(t7l66xb->irq, NULL, NULL);
 266
 267         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 268                 irq_set_chip(irq, NULL);
 269                 irq_set_chip_data(irq, NULL);
 270         }
 271 }
 272
 273 /*--------------------------------------------------------------------------*/
 274
 275 #ifdef CONFIG_PM
 276 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
 277 {
 278         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 279         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 280
 281         if (pdata && pdata->suspend)
 282                 pdata->suspend(dev);
 283         clk_disable_unprepare(t7l66xb->clk48m);
 284
 285         return 0;
 286 }
 287
 288 static int t7l66xb_resume(struct platform_device *dev)
 289 {
 290         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 291         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 292         int ret;
 293
 294         ret = clk_prepare_enable(t7l66xb->clk48m);
 295         if (ret)
 296                 return ret;
 297
 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_get_platdata(&dev->dev);
 316         struct t7l66xb *t7l66xb;
 317         struct resource *iomem, *rscr;
 318         int ret;
 319
 320         if (!pdata)
 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         raw_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         ret = clk_prepare_enable(t7l66xb->clk48m);
 372         if (ret)
 373                 goto err_clk_enable;
 374
 375         if (pdata->enable)
 376                 pdata->enable(dev);
 377
 378         /* Mask all interrupts */
 379         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
 380
 381         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
 382                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
 383                 (unsigned long)iomem->start, t7l66xb->irq);
 384
 385         t7l66xb_attach_irq(dev);
 386
 387         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
 388         t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);
 389
 390         ret = mfd_add_devices(&dev->dev, dev->id,
 391                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
 392                               iomem, t7l66xb->irq_base, NULL);
 393
 394         if (!ret)
 395                 return 0;
 396
 397         t7l66xb_detach_irq(dev);
 398         clk_disable_unprepare(t7l66xb->clk48m);
 399 err_clk_enable:
 400         iounmap(t7l66xb->scr);
 401 err_ioremap:
 402         release_resource(&t7l66xb->rscr);
 403 err_request_scr:
 404         clk_put(t7l66xb->clk48m);
 405 err_clk48m_get:
 406         clk_put(t7l66xb->clk32k);
 407 err_clk32k_get:
 408 err_noirq:
 409         kfree(t7l66xb);
 410         return ret;
 411 }
 412
 413 static int t7l66xb_remove(struct platform_device *dev)
 414 {
 415         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 416         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 417         int ret;
 418
 419         ret = pdata->disable(dev);
 420         clk_disable_unprepare(t7l66xb->clk48m);
 421         clk_put(t7l66xb->clk48m);
 422         clk_disable_unprepare(t7l66xb->clk32k);
 423         clk_put(t7l66xb->clk32k);
 424         t7l66xb_detach_irq(dev);
 425         iounmap(t7l66xb->scr);
 426         release_resource(&t7l66xb->rscr);
 427         mfd_remove_devices(&dev->dev);
 428         kfree(t7l66xb);
 429
 430         return ret;
 431
 432 }
 433
 434 static struct platform_driver t7l66xb_platform_driver = {
 435         .driver = {
 436                 .name   = "t7l66xb",
 437         },
 438         .suspend        = t7l66xb_suspend,
 439         .resume         = t7l66xb_resume,
 440         .probe          = t7l66xb_probe,
 441         .remove         = t7l66xb_remove,
 442 };
 443
 444 /*--------------------------------------------------------------------------*/
 445
 446 module_platform_driver(t7l66xb_platform_driver);
 447
 448 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 449 MODULE_LICENSE("GPL v2");
 450 MODULE_AUTHOR("Ian Molton");
 451 MODULE_ALIAS("platform:t7l66xb");