drivers/mfd/t7l66xb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  * Toshiba T7L66XB core mfd support
   5  *
   6  * Copyright (c) 2005, 2007, 2008 Ian Molton
   7  * Copyright (c) 2008 Dmitry Baryshkov
   8  *
   9  * T7L66 features:
  10  *
  11  * Supported in this driver:
  12  * SD/MMC
  13  * SM/NAND flash controller
  14  *
  15  * As yet not supported
  16  * GPIO interface (on NAND pins)
  17  * Serial interface
  18  * TFT 'interface converter'
  19  * PCMCIA interface logic
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/err.h>
  25 #include <linux/io.h>
  26 #include <linux/slab.h>
  27 #include <linux/irq.h>
  28 #include <linux/clk.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 static const struct resource t7l66xb_mmc_resources[] = {
  40         DEFINE_RES_MEM(0x800, 0x200),
  41         DEFINE_RES_IRQ(IRQ_T7L66XB_MMC)
  42 };
  43
  44 #define SCR_REVID       0x08            /* b Revision ID        */
  45 #define SCR_IMR         0x42            /* b Interrupt Mask     */
  46 #define SCR_DEV_CTL     0xe0            /* b Device control     */
  47 #define SCR_ISR         0xe1            /* b Interrupt Status   */
  48 #define SCR_GPO_OC      0xf0            /* b GPO output control */
  49 #define SCR_GPO_OS      0xf1            /* b GPO output enable  */
  50 #define SCR_GPI_S       0xf2            /* w GPI status         */
  51 #define SCR_APDC        0xf8            /* b Active pullup down ctrl */
  52
  53 #define SCR_DEV_CTL_USB         BIT(0)  /* USB enable           */
  54 #define SCR_DEV_CTL_MMC         BIT(1)  /* MMC enable           */
  55
  56 /*--------------------------------------------------------------------------*/
  57
  58 struct t7l66xb {
  59         void __iomem            *scr;
  60         /* Lock to protect registers requiring read/modify/write ops. */
  61         raw_spinlock_t          lock;
  62
  63         struct resource         rscr;
  64         struct clk              *clk48m;
  65         struct clk              *clk32k;
  66         int                     irq;
  67         int                     irq_base;
  68 };
  69
  70 /*--------------------------------------------------------------------------*/
  71
  72 static int t7l66xb_mmc_enable(struct platform_device *mmc)
  73 {
  74         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
  75         unsigned long flags;
  76         u8 dev_ctl;
  77         int ret;
  78
  79         ret = clk_prepare_enable(t7l66xb->clk32k);
  80         if (ret)
  81                 return ret;
  82
  83         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
  84
  85         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
  86         dev_ctl |= SCR_DEV_CTL_MMC;
  87         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
  88
  89         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
  90
  91         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
  92                 t7l66xb_mmc_resources[0].start & 0xfffe);
  93
  94         return 0;
  95 }
  96
  97 static int t7l66xb_mmc_disable(struct platform_device *mmc)
  98 {
  99         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
 100         unsigned long flags;
 101         u8 dev_ctl;
 102
 103         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
 104
 105         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
 106         dev_ctl &= ~SCR_DEV_CTL_MMC;
 107         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
 108
 109         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
 110
 111         clk_disable_unprepare(t7l66xb->clk32k);
 112
 113         return 0;
 114 }
 115
 116 static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
 117 {
 118         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
 119
 120         tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
 121 }
 122
 123 static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
 124 {
 125         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
 126
 127         tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
 128 }
 129
 130 /*--------------------------------------------------------------------------*/
 131
 132 static struct tmio_mmc_data t7166xb_mmc_data = {
 133         .hclk = 24000000,
 134         .set_pwr = t7l66xb_mmc_pwr,
 135         .set_clk_div = t7l66xb_mmc_clk_div,
 136 };
 137
 138 static const struct resource t7l66xb_nand_resources[] = {
 139         {
 140                 .start  = 0xc00,
 141                 .end    = 0xc07,
 142                 .flags  = IORESOURCE_MEM,
 143         },
 144         {
 145                 .start  = 0x0100,
 146                 .end    = 0x01ff,
 147                 .flags  = IORESOURCE_MEM,
 148         },
 149         {
 150                 .start  = IRQ_T7L66XB_NAND,
 151                 .end    = IRQ_T7L66XB_NAND,
 152                 .flags  = IORESOURCE_IRQ,
 153         },
 154 };
 155
 156 static struct mfd_cell t7l66xb_cells[] = {
 157         [T7L66XB_CELL_MMC] = {
 158                 .name = "tmio-mmc",
 159                 .enable = t7l66xb_mmc_enable,
 160                 .disable = t7l66xb_mmc_disable,
 161                 .platform_data = &t7166xb_mmc_data,
 162                 .pdata_size    = sizeof(t7166xb_mmc_data),
 163                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
 164                 .resources = t7l66xb_mmc_resources,
 165         },
 166         [T7L66XB_CELL_NAND] = {
 167                 .name = "tmio-nand",
 168                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
 169                 .resources = t7l66xb_nand_resources,
 170         },
 171 };
 172
 173 /*--------------------------------------------------------------------------*/
 174
 175 /* Handle the T7L66XB interrupt mux */
 176 static void t7l66xb_irq(struct irq_desc *desc)
 177 {
 178         struct t7l66xb *t7l66xb = irq_desc_get_handler_data(desc);
 179         unsigned int isr;
 180         unsigned int i, irq_base;
 181
 182         irq_base = t7l66xb->irq_base;
 183
 184         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
 185                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
 186                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
 187                         if (isr & (1 << i))
 188                                 generic_handle_irq(irq_base + i);
 189 }
 190
 191 static void t7l66xb_irq_mask(struct irq_data *data)
 192 {
 193         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
 194         unsigned long                   flags;
 195         u8 imr;
 196
 197         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
 198         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 199         imr |= 1 << (data->irq - t7l66xb->irq_base);
 200         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 201         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
 202 }
 203
 204 static void t7l66xb_irq_unmask(struct irq_data *data)
 205 {
 206         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
 207         unsigned long flags;
 208         u8 imr;
 209
 210         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
 211         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 212         imr &= ~(1 << (data->irq - t7l66xb->irq_base));
 213         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 214         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
 215 }
 216
 217 static struct irq_chip t7l66xb_chip = {
 218         .name           = "t7l66xb",
 219         .irq_ack        = t7l66xb_irq_mask,
 220         .irq_mask       = t7l66xb_irq_mask,
 221         .irq_unmask     = t7l66xb_irq_unmask,
 222 };
 223
 224 /*--------------------------------------------------------------------------*/
 225
 226 /* Install the IRQ handler */
 227 static void t7l66xb_attach_irq(struct platform_device *dev)
 228 {
 229         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 230         unsigned int irq, irq_base;
 231
 232         irq_base = t7l66xb->irq_base;
 233
 234         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 235                 irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
 236                 irq_set_chip_data(irq, t7l66xb);
 237         }
 238
 239         irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
 240         irq_set_chained_handler_and_data(t7l66xb->irq, t7l66xb_irq, t7l66xb);
 241 }
 242
 243 static void t7l66xb_detach_irq(struct platform_device *dev)
 244 {
 245         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 246         unsigned int irq, irq_base;
 247
 248         irq_base = t7l66xb->irq_base;
 249
 250         irq_set_chained_handler_and_data(t7l66xb->irq, NULL, NULL);
 251
 252         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 253                 irq_set_chip(irq, NULL);
 254                 irq_set_chip_data(irq, NULL);
 255         }
 256 }
 257
 258 /*--------------------------------------------------------------------------*/
 259
 260 #ifdef CONFIG_PM
 261 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
 262 {
 263         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 264         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 265
 266         if (pdata && pdata->suspend)
 267                 pdata->suspend(dev);
 268         clk_disable_unprepare(t7l66xb->clk48m);
 269
 270         return 0;
 271 }
 272
 273 static int t7l66xb_resume(struct platform_device *dev)
 274 {
 275         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 276         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 277         int ret;
 278
 279         ret = clk_prepare_enable(t7l66xb->clk48m);
 280         if (ret)
 281                 return ret;
 282
 283         if (pdata && pdata->resume)
 284                 pdata->resume(dev);
 285
 286         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
 287                 t7l66xb_mmc_resources[0].start & 0xfffe);
 288
 289         return 0;
 290 }
 291 #else
 292 #define t7l66xb_suspend NULL
 293 #define t7l66xb_resume  NULL
 294 #endif
 295
 296 /*--------------------------------------------------------------------------*/
 297
 298 static int t7l66xb_probe(struct platform_device *dev)
 299 {
 300         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 301         struct t7l66xb *t7l66xb;
 302         struct resource *iomem, *rscr;
 303         int ret;
 304
 305         if (!pdata)
 306                 return -EINVAL;
 307
 308         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 309         if (!iomem)
 310                 return -EINVAL;
 311
 312         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
 313         if (!t7l66xb)
 314                 return -ENOMEM;
 315
 316         raw_spin_lock_init(&t7l66xb->lock);
 317
 318         platform_set_drvdata(dev, t7l66xb);
 319
 320         ret = platform_get_irq(dev, 0);
 321         if (ret >= 0)
 322                 t7l66xb->irq = ret;
 323         else
 324                 goto err_noirq;
 325
 326         t7l66xb->irq_base = pdata->irq_base;
 327
 328         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
 329         if (IS_ERR(t7l66xb->clk32k)) {
 330                 ret = PTR_ERR(t7l66xb->clk32k);
 331                 goto err_clk32k_get;
 332         }
 333
 334         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
 335         if (IS_ERR(t7l66xb->clk48m)) {
 336                 ret = PTR_ERR(t7l66xb->clk48m);
 337                 goto err_clk48m_get;
 338         }
 339
 340         rscr = &t7l66xb->rscr;
 341         rscr->name = "t7l66xb-core";
 342         rscr->start = iomem->start;
 343         rscr->end = iomem->start + 0xff;
 344         rscr->flags = IORESOURCE_MEM;
 345
 346         ret = request_resource(iomem, rscr);
 347         if (ret)
 348                 goto err_request_scr;
 349
 350         t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
 351         if (!t7l66xb->scr) {
 352                 ret = -ENOMEM;
 353                 goto err_ioremap;
 354         }
 355
 356         ret = clk_prepare_enable(t7l66xb->clk48m);
 357         if (ret)
 358                 goto err_clk_enable;
 359
 360         if (pdata->enable)
 361                 pdata->enable(dev);
 362
 363         /* Mask all interrupts */
 364         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
 365
 366         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
 367                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
 368                 (unsigned long)iomem->start, t7l66xb->irq);
 369
 370         t7l66xb_attach_irq(dev);
 371
 372         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
 373         t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);
 374
 375         ret = mfd_add_devices(&dev->dev, dev->id,
 376                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
 377                               iomem, t7l66xb->irq_base, NULL);
 378
 379         if (!ret)
 380                 return 0;
 381
 382         t7l66xb_detach_irq(dev);
 383         clk_disable_unprepare(t7l66xb->clk48m);
 384 err_clk_enable:
 385         iounmap(t7l66xb->scr);
 386 err_ioremap:
 387         release_resource(&t7l66xb->rscr);
 388 err_request_scr:
 389         clk_put(t7l66xb->clk48m);
 390 err_clk48m_get:
 391         clk_put(t7l66xb->clk32k);
 392 err_clk32k_get:
 393 err_noirq:
 394         kfree(t7l66xb);
 395         return ret;
 396 }
 397
 398 static int t7l66xb_remove(struct platform_device *dev)
 399 {
 400         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 401
 402         clk_disable_unprepare(t7l66xb->clk48m);
 403         clk_put(t7l66xb->clk48m);
 404         clk_disable_unprepare(t7l66xb->clk32k);
 405         clk_put(t7l66xb->clk32k);
 406         t7l66xb_detach_irq(dev);
 407         iounmap(t7l66xb->scr);
 408         release_resource(&t7l66xb->rscr);
 409         mfd_remove_devices(&dev->dev);
 410         kfree(t7l66xb);
 411
 412         return 0;
 413 }
 414
 415 static struct platform_driver t7l66xb_platform_driver = {
 416         .driver = {
 417                 .name   = "t7l66xb",
 418         },
 419         .suspend        = t7l66xb_suspend,
 420         .resume         = t7l66xb_resume,
 421         .probe          = t7l66xb_probe,
 422         .remove         = t7l66xb_remove,
 423 };
 424
 425 /*--------------------------------------------------------------------------*/
 426
 427 module_platform_driver(t7l66xb_platform_driver);
 428
 429 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 430 MODULE_LICENSE("GPL v2");
 431 MODULE_AUTHOR("Ian Molton");
 432 MODULE_ALIAS("platform:t7l66xb");