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/io.h>
  28 #include <linux/irq.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/mfd/core.h>
  31 #include <linux/mfd/tmio.h>
  32 #include <linux/mfd/t7l66xb.h>
  33
  34 enum {
  35         T7L66XB_CELL_NAND,
  36         T7L66XB_CELL_MMC,
  37 };
  38
  39 #define SCR_REVID       0x08            /* b Revision ID        */
  40 #define SCR_IMR         0x42            /* b Interrupt Mask     */
  41 #define SCR_DEV_CTL     0xe0            /* b Device control     */
  42 #define SCR_ISR         0xe1            /* b Interrupt Status   */
  43 #define SCR_GPO_OC      0xf0            /* b GPO output control */
  44 #define SCR_GPO_OS      0xf1            /* b GPO output enable  */
  45 #define SCR_GPI_S       0xf2            /* w GPI status         */
  46 #define SCR_APDC        0xf8            /* b Active pullup down ctrl */
  47
  48 #define SCR_DEV_CTL_USB         BIT(0)  /* USB enable           */
  49 #define SCR_DEV_CTL_MMC         BIT(1)  /* MMC enable           */
  50
  51 /*--------------------------------------------------------------------------*/
  52
  53 struct t7l66xb {
  54         void __iomem            *scr;
  55         /* Lock to protect registers requiring read/modify/write ops. */
  56         spinlock_t              lock;
  57
  58         struct resource         rscr;
  59         int                     irq;
  60         int                     irq_base;
  61 };
  62
  63 /*--------------------------------------------------------------------------*/
  64
  65 static int t7l66xb_mmc_enable(struct platform_device *mmc)
  66 {
  67         struct platform_device *dev = to_platform_device(mmc->dev.parent);
  68         struct t7l66xb_platform_data   *pdata = dev->dev.platform_data;
  69         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
  70         unsigned long flags;
  71         u8 dev_ctl;
  72
  73         if (pdata->enable_clk32k)
  74                 pdata->enable_clk32k(dev);
  75
  76         spin_lock_irqsave(&t7l66xb->lock, flags);
  77
  78         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
  79         dev_ctl |= SCR_DEV_CTL_MMC;
  80         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
  81
  82         spin_unlock_irqrestore(&t7l66xb->lock, flags);
  83
  84         return 0;
  85 }
  86
  87 static int t7l66xb_mmc_disable(struct platform_device *mmc)
  88 {
  89         struct platform_device *dev = to_platform_device(mmc->dev.parent);
  90         struct t7l66xb_platform_data   *pdata = dev->dev.platform_data;
  91         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
  92         unsigned long flags;
  93         u8 dev_ctl;
  94
  95         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         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 102
 103         if (pdata->disable_clk32k)
 104                 pdata->disable_clk32k(dev);
 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_platform_data *pdata = dev->dev.platform_data;
 262
 263         if (pdata && pdata->suspend)
 264                 pdata->suspend(dev);
 265
 266         return 0;
 267 }
 268
 269 static int t7l66xb_resume(struct platform_device *dev)
 270 {
 271         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 272
 273         if (pdata && pdata->resume)
 274                 pdata->resume(dev);
 275
 276         return 0;
 277 }
 278 #else
 279 #define t7l66xb_suspend NULL
 280 #define t7l66xb_resume  NULL
 281 #endif
 282
 283 /*--------------------------------------------------------------------------*/
 284
 285 static int t7l66xb_probe(struct platform_device *dev)
 286 {
 287         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 288         struct t7l66xb *t7l66xb;
 289         struct resource *iomem, *rscr;
 290         int ret;
 291
 292         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 293         if (!iomem)
 294                 return -EINVAL;
 295
 296         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
 297         if (!t7l66xb)
 298                 return -ENOMEM;
 299
 300         spin_lock_init(&t7l66xb->lock);
 301
 302         platform_set_drvdata(dev, t7l66xb);
 303
 304         ret = platform_get_irq(dev, 0);
 305         if (ret >= 0)
 306                 t7l66xb->irq = ret;
 307         else
 308                 goto err_noirq;
 309
 310         t7l66xb->irq_base = pdata->irq_base;
 311
 312         rscr = &t7l66xb->rscr;
 313         rscr->name = "t7l66xb-core";
 314         rscr->start = iomem->start;
 315         rscr->end = iomem->start + 0xff;
 316         rscr->flags = IORESOURCE_MEM;
 317
 318         ret = request_resource(iomem, rscr);
 319         if (ret)
 320                 goto err_request_scr;
 321
 322         t7l66xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
 323         if (!t7l66xb->scr) {
 324                 ret = -ENOMEM;
 325                 goto err_ioremap;
 326         }
 327
 328         if (pdata && pdata->enable)
 329                 pdata->enable(dev);
 330
 331         /* Mask all interrupts */
 332         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
 333
 334         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
 335                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
 336                 (unsigned long)iomem->start, t7l66xb->irq);
 337
 338         t7l66xb_attach_irq(dev);
 339
 340         t7l66xb_cells[T7L66XB_CELL_NAND].driver_data = pdata->nand_data;
 341
 342         ret = mfd_add_devices(dev, t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
 343                 iomem, t7l66xb->irq_base);
 344
 345         if (!ret)
 346                 return 0;
 347
 348         t7l66xb_detach_irq(dev);
 349         iounmap(t7l66xb->scr);
 350 err_ioremap:
 351         release_resource(&t7l66xb->rscr);
 352 err_noirq:
 353 err_request_scr:
 354         kfree(t7l66xb);
 355         return ret;
 356 }
 357
 358 static int t7l66xb_remove(struct platform_device *dev)
 359 {
 360         struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
 361         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 362         int ret;
 363
 364         ret = pdata->disable(dev);
 365
 366         t7l66xb_detach_irq(dev);
 367         iounmap(t7l66xb->scr);
 368         release_resource(&t7l66xb->rscr);
 369         mfd_remove_devices(dev);
 370         platform_set_drvdata(dev, NULL);
 371         kfree(t7l66xb);
 372
 373         return ret;
 374
 375 }
 376
 377 static struct platform_driver t7l66xb_platform_driver = {
 378         .driver = {
 379                 .name   = "t7l66xb",
 380                 .owner  = THIS_MODULE,
 381         },
 382         .suspend        = t7l66xb_suspend,
 383         .resume         = t7l66xb_resume,
 384         .probe          = t7l66xb_probe,
 385         .remove         = t7l66xb_remove,
 386 };
 387
 388 /*--------------------------------------------------------------------------*/
 389
 390 static int __init t7l66xb_init(void)
 391 {
 392         int retval = 0;
 393
 394         retval = platform_driver_register(&t7l66xb_platform_driver);
 395         return retval;
 396 }
 397
 398 static void __exit t7l66xb_exit(void)
 399 {
 400         platform_driver_unregister(&t7l66xb_platform_driver);
 401 }
 402
 403 module_init(t7l66xb_init);
 404 module_exit(t7l66xb_exit);
 405
 406 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 407 MODULE_LICENSE("GPL v2");
 408 MODULE_AUTHOR("Ian Molton");
 409 MODULE_ALIAS("platform:t7l66xb");