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                 .platform_data = &t7166xb_mmc_data,
 174                 .pdata_size    = sizeof(t7166xb_mmc_data),
 175                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
 176                 .resources = t7l66xb_mmc_resources,
 177         },
 178         [T7L66XB_CELL_NAND] = {
 179                 .name = "tmio-nand",
 180                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
 181                 .resources = t7l66xb_nand_resources,
 182         },
 183 };
 184
 185 /*--------------------------------------------------------------------------*/
 186
 187 /* Handle the T7L66XB interrupt mux */
 188 static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
 189 {
 190         struct t7l66xb *t7l66xb = irq_get_handler_data(irq);
 191         unsigned int isr;
 192         unsigned int i, irq_base;
 193
 194         irq_base = t7l66xb->irq_base;
 195
 196         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
 197                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
 198                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
 199                         if (isr & (1 << i))
 200                                 generic_handle_irq(irq_base + i);
 201 }
 202
 203 static void t7l66xb_irq_mask(struct irq_data *data)
 204 {
 205         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
 206         unsigned long                   flags;
 207         u8 imr;
 208
 209         spin_lock_irqsave(&t7l66xb->lock, flags);
 210         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 211         imr |= 1 << (data->irq - t7l66xb->irq_base);
 212         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 213         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 214 }
 215
 216 static void t7l66xb_irq_unmask(struct irq_data *data)
 217 {
 218         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
 219         unsigned long flags;
 220         u8 imr;
 221
 222         spin_lock_irqsave(&t7l66xb->lock, flags);
 223         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 224         imr &= ~(1 << (data->irq - t7l66xb->irq_base));
 225         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 226         spin_unlock_irqrestore(&t7l66xb->lock, flags);
 227 }
 228
 229 static struct irq_chip t7l66xb_chip = {
 230         .name           = "t7l66xb",
 231         .irq_ack        = t7l66xb_irq_mask,
 232         .irq_mask       = t7l66xb_irq_mask,
 233         .irq_unmask     = t7l66xb_irq_unmask,
 234 };
 235
 236 /*--------------------------------------------------------------------------*/
 237
 238 /* Install the IRQ handler */
 239 static void t7l66xb_attach_irq(struct platform_device *dev)
 240 {
 241         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 242         unsigned int irq, irq_base;
 243
 244         irq_base = t7l66xb->irq_base;
 245
 246         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 247                 irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
 248                 irq_set_chip_data(irq, t7l66xb);
 249 #ifdef CONFIG_ARM
 250                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 251 #endif
 252         }
 253
 254         irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
 255         irq_set_handler_data(t7l66xb->irq, t7l66xb);
 256         irq_set_chained_handler(t7l66xb->irq, t7l66xb_irq);
 257 }
 258
 259 static void t7l66xb_detach_irq(struct platform_device *dev)
 260 {
 261         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 262         unsigned int irq, irq_base;
 263
 264         irq_base = t7l66xb->irq_base;
 265
 266         irq_set_chained_handler(t7l66xb->irq, NULL);
 267         irq_set_handler_data(t7l66xb->irq, NULL);
 268
 269         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 270 #ifdef CONFIG_ARM
 271                 set_irq_flags(irq, 0);
 272 #endif
 273                 irq_set_chip(irq, NULL);
 274                 irq_set_chip_data(irq, NULL);
 275         }
 276 }
 277
 278 /*--------------------------------------------------------------------------*/
 279
 280 #ifdef CONFIG_PM
 281 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
 282 {
 283         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 284         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 285
 286         if (pdata && pdata->suspend)
 287                 pdata->suspend(dev);
 288         clk_disable(t7l66xb->clk48m);
 289
 290         return 0;
 291 }
 292
 293 static int t7l66xb_resume(struct platform_device *dev)
 294 {
 295         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 296         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 297
 298         clk_enable(t7l66xb->clk48m);
 299         if (pdata && pdata->resume)
 300                 pdata->resume(dev);
 301
 302         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
 303                 t7l66xb_mmc_resources[0].start & 0xfffe);
 304
 305         return 0;
 306 }
 307 #else
 308 #define t7l66xb_suspend NULL
 309 #define t7l66xb_resume  NULL
 310 #endif
 311
 312 /*--------------------------------------------------------------------------*/
 313
 314 static int t7l66xb_probe(struct platform_device *dev)
 315 {
 316         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 317         struct t7l66xb *t7l66xb;
 318         struct resource *iomem, *rscr;
 319         int ret;
 320
 321         if (pdata == NULL)
 322                 return -EINVAL;
 323
 324         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 325         if (!iomem)
 326                 return -EINVAL;
 327
 328         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
 329         if (!t7l66xb)
 330                 return -ENOMEM;
 331
 332         spin_lock_init(&t7l66xb->lock);
 333
 334         platform_set_drvdata(dev, t7l66xb);
 335
 336         ret = platform_get_irq(dev, 0);
 337         if (ret >= 0)
 338                 t7l66xb->irq = ret;
 339         else
 340                 goto err_noirq;
 341
 342         t7l66xb->irq_base = pdata->irq_base;
 343
 344         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
 345         if (IS_ERR(t7l66xb->clk32k)) {
 346                 ret = PTR_ERR(t7l66xb->clk32k);
 347                 goto err_clk32k_get;
 348         }
 349
 350         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
 351         if (IS_ERR(t7l66xb->clk48m)) {
 352                 ret = PTR_ERR(t7l66xb->clk48m);
 353                 goto err_clk48m_get;
 354         }
 355
 356         rscr = &t7l66xb->rscr;
 357         rscr->name = "t7l66xb-core";
 358         rscr->start = iomem->start;
 359         rscr->end = iomem->start + 0xff;
 360         rscr->flags = IORESOURCE_MEM;
 361
 362         ret = request_resource(iomem, rscr);
 363         if (ret)
 364                 goto err_request_scr;
 365
 366         t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
 367         if (!t7l66xb->scr) {
 368                 ret = -ENOMEM;
 369                 goto err_ioremap;
 370         }
 371
 372         clk_enable(t7l66xb->clk48m);
 373
 374         if (pdata && pdata->enable)
 375                 pdata->enable(dev);
 376
 377         /* Mask all interrupts */
 378         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
 379
 380         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
 381                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
 382                 (unsigned long)iomem->start, t7l66xb->irq);
 383
 384         t7l66xb_attach_irq(dev);
 385
 386         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
 387         t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);
 388
 389         ret = mfd_add_devices(&dev->dev, dev->id,
 390                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
 391                               iomem, t7l66xb->irq_base, NULL);
 392
 393         if (!ret)
 394                 return 0;
 395
 396         t7l66xb_detach_irq(dev);
 397         iounmap(t7l66xb->scr);
 398 err_ioremap:
 399         release_resource(&t7l66xb->rscr);
 400 err_request_scr:
 401         clk_put(t7l66xb->clk48m);
 402 err_clk48m_get:
 403         clk_put(t7l66xb->clk32k);
 404 err_clk32k_get:
 405 err_noirq:
 406         kfree(t7l66xb);
 407         return ret;
 408 }
 409
 410 static int t7l66xb_remove(struct platform_device *dev)
 411 {
 412         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 413         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 414         int ret;
 415
 416         ret = pdata->disable(dev);
 417         clk_disable(t7l66xb->clk48m);
 418         clk_put(t7l66xb->clk48m);
 419         clk_disable(t7l66xb->clk32k);
 420         clk_put(t7l66xb->clk32k);
 421         t7l66xb_detach_irq(dev);
 422         iounmap(t7l66xb->scr);
 423         release_resource(&t7l66xb->rscr);
 424         mfd_remove_devices(&dev->dev);
 425         kfree(t7l66xb);
 426
 427         return ret;
 428
 429 }
 430
 431 static struct platform_driver t7l66xb_platform_driver = {
 432         .driver = {
 433                 .name   = "t7l66xb",
 434                 .owner  = THIS_MODULE,
 435         },
 436         .suspend        = t7l66xb_suspend,
 437         .resume         = t7l66xb_resume,
 438         .probe          = t7l66xb_probe,
 439         .remove         = t7l66xb_remove,
 440 };
 441
 442 /*--------------------------------------------------------------------------*/
 443
 444 module_platform_driver(t7l66xb_platform_driver);
 445
 446 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 447 MODULE_LICENSE("GPL v2");
 448 MODULE_AUTHOR("Ian Molton");
 449 MODULE_ALIAS("platform:t7l66xb");