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         {
  41                 .start = 0x800,
  42                 .end    = 0x9ff,
  43                 .flags = IORESOURCE_MEM,
  44         },
  45         {
  46                 .start = IRQ_T7L66XB_MMC,
  47                 .end    = IRQ_T7L66XB_MMC,
  48                 .flags = IORESOURCE_IRQ,
  49         },
  50 };
  51
  52 #define SCR_REVID       0x08            /* b Revision ID        */
  53 #define SCR_IMR         0x42            /* b Interrupt Mask     */
  54 #define SCR_DEV_CTL     0xe0            /* b Device control     */
  55 #define SCR_ISR         0xe1            /* b Interrupt Status   */
  56 #define SCR_GPO_OC      0xf0            /* b GPO output control */
  57 #define SCR_GPO_OS      0xf1            /* b GPO output enable  */
  58 #define SCR_GPI_S       0xf2            /* w GPI status         */
  59 #define SCR_APDC        0xf8            /* b Active pullup down ctrl */
  60
  61 #define SCR_DEV_CTL_USB         BIT(0)  /* USB enable           */
  62 #define SCR_DEV_CTL_MMC         BIT(1)  /* MMC enable           */
  63
  64 /*--------------------------------------------------------------------------*/
  65
  66 struct t7l66xb {
  67         void __iomem            *scr;
  68         /* Lock to protect registers requiring read/modify/write ops. */
  69         raw_spinlock_t          lock;
  70
  71         struct resource         rscr;
  72         struct clk              *clk48m;
  73         struct clk              *clk32k;
  74         int                     irq;
  75         int                     irq_base;
  76 };
  77
  78 /*--------------------------------------------------------------------------*/
  79
  80 static int t7l66xb_mmc_enable(struct platform_device *mmc)
  81 {
  82         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
  83         unsigned long flags;
  84         u8 dev_ctl;
  85         int ret;
  86
  87         ret = clk_prepare_enable(t7l66xb->clk32k);
  88         if (ret)
  89                 return ret;
  90
  91         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
  92
  93         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
  94         dev_ctl |= SCR_DEV_CTL_MMC;
  95         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
  96
  97         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
  98
  99         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
 100                 t7l66xb_mmc_resources[0].start & 0xfffe);
 101
 102         return 0;
 103 }
 104
 105 static int t7l66xb_mmc_disable(struct platform_device *mmc)
 106 {
 107         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
 108         unsigned long flags;
 109         u8 dev_ctl;
 110
 111         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
 112
 113         dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
 114         dev_ctl &= ~SCR_DEV_CTL_MMC;
 115         tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
 116
 117         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
 118
 119         clk_disable_unprepare(t7l66xb->clk32k);
 120
 121         return 0;
 122 }
 123
 124 static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
 125 {
 126         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
 127
 128         tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
 129 }
 130
 131 static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
 132 {
 133         struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
 134
 135         tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
 136 }
 137
 138 /*--------------------------------------------------------------------------*/
 139
 140 static struct tmio_mmc_data t7166xb_mmc_data = {
 141         .hclk = 24000000,
 142         .set_pwr = t7l66xb_mmc_pwr,
 143         .set_clk_div = t7l66xb_mmc_clk_div,
 144 };
 145
 146 static const struct resource t7l66xb_nand_resources[] = {
 147         {
 148                 .start  = 0xc00,
 149                 .end    = 0xc07,
 150                 .flags  = IORESOURCE_MEM,
 151         },
 152         {
 153                 .start  = 0x0100,
 154                 .end    = 0x01ff,
 155                 .flags  = IORESOURCE_MEM,
 156         },
 157         {
 158                 .start  = IRQ_T7L66XB_NAND,
 159                 .end    = IRQ_T7L66XB_NAND,
 160                 .flags  = IORESOURCE_IRQ,
 161         },
 162 };
 163
 164 static struct mfd_cell t7l66xb_cells[] = {
 165         [T7L66XB_CELL_MMC] = {
 166                 .name = "tmio-mmc",
 167                 .enable = t7l66xb_mmc_enable,
 168                 .disable = t7l66xb_mmc_disable,
 169                 .platform_data = &t7166xb_mmc_data,
 170                 .pdata_size    = sizeof(t7166xb_mmc_data),
 171                 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
 172                 .resources = t7l66xb_mmc_resources,
 173         },
 174         [T7L66XB_CELL_NAND] = {
 175                 .name = "tmio-nand",
 176                 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
 177                 .resources = t7l66xb_nand_resources,
 178         },
 179 };
 180
 181 /*--------------------------------------------------------------------------*/
 182
 183 /* Handle the T7L66XB interrupt mux */
 184 static void t7l66xb_irq(struct irq_desc *desc)
 185 {
 186         struct t7l66xb *t7l66xb = irq_desc_get_handler_data(desc);
 187         unsigned int isr;
 188         unsigned int i, irq_base;
 189
 190         irq_base = t7l66xb->irq_base;
 191
 192         while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
 193                                 ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
 194                 for (i = 0; i < T7L66XB_NR_IRQS; i++)
 195                         if (isr & (1 << i))
 196                                 generic_handle_irq(irq_base + i);
 197 }
 198
 199 static void t7l66xb_irq_mask(struct irq_data *data)
 200 {
 201         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
 202         unsigned long                   flags;
 203         u8 imr;
 204
 205         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
 206         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 207         imr |= 1 << (data->irq - t7l66xb->irq_base);
 208         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 209         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
 210 }
 211
 212 static void t7l66xb_irq_unmask(struct irq_data *data)
 213 {
 214         struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
 215         unsigned long flags;
 216         u8 imr;
 217
 218         raw_spin_lock_irqsave(&t7l66xb->lock, flags);
 219         imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
 220         imr &= ~(1 << (data->irq - t7l66xb->irq_base));
 221         tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
 222         raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
 223 }
 224
 225 static struct irq_chip t7l66xb_chip = {
 226         .name           = "t7l66xb",
 227         .irq_ack        = t7l66xb_irq_mask,
 228         .irq_mask       = t7l66xb_irq_mask,
 229         .irq_unmask     = t7l66xb_irq_unmask,
 230 };
 231
 232 /*--------------------------------------------------------------------------*/
 233
 234 /* Install the IRQ handler */
 235 static void t7l66xb_attach_irq(struct platform_device *dev)
 236 {
 237         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 238         unsigned int irq, irq_base;
 239
 240         irq_base = t7l66xb->irq_base;
 241
 242         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 243                 irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
 244                 irq_set_chip_data(irq, t7l66xb);
 245         }
 246
 247         irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
 248         irq_set_chained_handler_and_data(t7l66xb->irq, t7l66xb_irq, t7l66xb);
 249 }
 250
 251 static void t7l66xb_detach_irq(struct platform_device *dev)
 252 {
 253         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 254         unsigned int irq, irq_base;
 255
 256         irq_base = t7l66xb->irq_base;
 257
 258         irq_set_chained_handler_and_data(t7l66xb->irq, NULL, NULL);
 259
 260         for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
 261                 irq_set_chip(irq, NULL);
 262                 irq_set_chip_data(irq, NULL);
 263         }
 264 }
 265
 266 /*--------------------------------------------------------------------------*/
 267
 268 #ifdef CONFIG_PM
 269 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
 270 {
 271         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 272         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 273
 274         if (pdata && pdata->suspend)
 275                 pdata->suspend(dev);
 276         clk_disable_unprepare(t7l66xb->clk48m);
 277
 278         return 0;
 279 }
 280
 281 static int t7l66xb_resume(struct platform_device *dev)
 282 {
 283         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 284         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 285         int ret;
 286
 287         ret = clk_prepare_enable(t7l66xb->clk48m);
 288         if (ret)
 289                 return ret;
 290
 291         if (pdata && pdata->resume)
 292                 pdata->resume(dev);
 293
 294         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
 295                 t7l66xb_mmc_resources[0].start & 0xfffe);
 296
 297         return 0;
 298 }
 299 #else
 300 #define t7l66xb_suspend NULL
 301 #define t7l66xb_resume  NULL
 302 #endif
 303
 304 /*--------------------------------------------------------------------------*/
 305
 306 static int t7l66xb_probe(struct platform_device *dev)
 307 {
 308         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 309         struct t7l66xb *t7l66xb;
 310         struct resource *iomem, *rscr;
 311         int ret;
 312
 313         if (!pdata)
 314                 return -EINVAL;
 315
 316         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 317         if (!iomem)
 318                 return -EINVAL;
 319
 320         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
 321         if (!t7l66xb)
 322                 return -ENOMEM;
 323
 324         raw_spin_lock_init(&t7l66xb->lock);
 325
 326         platform_set_drvdata(dev, t7l66xb);
 327
 328         ret = platform_get_irq(dev, 0);
 329         if (ret >= 0)
 330                 t7l66xb->irq = ret;
 331         else
 332                 goto err_noirq;
 333
 334         t7l66xb->irq_base = pdata->irq_base;
 335
 336         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
 337         if (IS_ERR(t7l66xb->clk32k)) {
 338                 ret = PTR_ERR(t7l66xb->clk32k);
 339                 goto err_clk32k_get;
 340         }
 341
 342         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
 343         if (IS_ERR(t7l66xb->clk48m)) {
 344                 ret = PTR_ERR(t7l66xb->clk48m);
 345                 goto err_clk48m_get;
 346         }
 347
 348         rscr = &t7l66xb->rscr;
 349         rscr->name = "t7l66xb-core";
 350         rscr->start = iomem->start;
 351         rscr->end = iomem->start + 0xff;
 352         rscr->flags = IORESOURCE_MEM;
 353
 354         ret = request_resource(iomem, rscr);
 355         if (ret)
 356                 goto err_request_scr;
 357
 358         t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
 359         if (!t7l66xb->scr) {
 360                 ret = -ENOMEM;
 361                 goto err_ioremap;
 362         }
 363
 364         ret = clk_prepare_enable(t7l66xb->clk48m);
 365         if (ret)
 366                 goto err_clk_enable;
 367
 368         if (pdata->enable)
 369                 pdata->enable(dev);
 370
 371         /* Mask all interrupts */
 372         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
 373
 374         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
 375                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
 376                 (unsigned long)iomem->start, t7l66xb->irq);
 377
 378         t7l66xb_attach_irq(dev);
 379
 380         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
 381         t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);
 382
 383         ret = mfd_add_devices(&dev->dev, dev->id,
 384                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
 385                               iomem, t7l66xb->irq_base, NULL);
 386
 387         if (!ret)
 388                 return 0;
 389
 390         t7l66xb_detach_irq(dev);
 391         clk_disable_unprepare(t7l66xb->clk48m);
 392 err_clk_enable:
 393         iounmap(t7l66xb->scr);
 394 err_ioremap:
 395         release_resource(&t7l66xb->rscr);
 396 err_request_scr:
 397         clk_put(t7l66xb->clk48m);
 398 err_clk48m_get:
 399         clk_put(t7l66xb->clk32k);
 400 err_clk32k_get:
 401 err_noirq:
 402         kfree(t7l66xb);
 403         return ret;
 404 }
 405
 406 static int t7l66xb_remove(struct platform_device *dev)
 407 {
 408         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 409         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 410         int ret;
 411
 412         ret = pdata->disable(dev);
 413         clk_disable_unprepare(t7l66xb->clk48m);
 414         clk_put(t7l66xb->clk48m);
 415         clk_disable_unprepare(t7l66xb->clk32k);
 416         clk_put(t7l66xb->clk32k);
 417         t7l66xb_detach_irq(dev);
 418         iounmap(t7l66xb->scr);
 419         release_resource(&t7l66xb->rscr);
 420         mfd_remove_devices(&dev->dev);
 421         kfree(t7l66xb);
 422
 423         return ret;
 424
 425 }
 426
 427 static struct platform_driver t7l66xb_platform_driver = {
 428         .driver = {
 429                 .name   = "t7l66xb",
 430         },
 431         .suspend        = t7l66xb_suspend,
 432         .resume         = t7l66xb_resume,
 433         .probe          = t7l66xb_probe,
 434         .remove         = t7l66xb_remove,
 435 };
 436
 437 /*--------------------------------------------------------------------------*/
 438
 439 module_platform_driver(t7l66xb_platform_driver);
 440
 441 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 442 MODULE_LICENSE("GPL v2");
 443 MODULE_AUTHOR("Ian Molton");
 444 MODULE_ALIAS("platform:t7l66xb");