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 static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
 261 {
 262         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 263         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 264
 265         if (pdata && pdata->suspend)
 266                 pdata->suspend(dev);
 267         clk_disable_unprepare(t7l66xb->clk48m);
 268
 269         return 0;
 270 }
 271
 272 static int t7l66xb_resume(struct platform_device *dev)
 273 {
 274         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 275         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 276         int ret;
 277
 278         ret = clk_prepare_enable(t7l66xb->clk48m);
 279         if (ret)
 280                 return ret;
 281
 282         if (pdata && pdata->resume)
 283                 pdata->resume(dev);
 284
 285         tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
 286                 t7l66xb_mmc_resources[0].start & 0xfffe);
 287
 288         return 0;
 289 }
 290
 291 /*--------------------------------------------------------------------------*/
 292
 293 static int t7l66xb_probe(struct platform_device *dev)
 294 {
 295         struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
 296         struct t7l66xb *t7l66xb;
 297         struct resource *iomem, *rscr;
 298         int ret;
 299
 300         if (!pdata)
 301                 return -EINVAL;
 302
 303         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 304         if (!iomem)
 305                 return -EINVAL;
 306
 307         t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
 308         if (!t7l66xb)
 309                 return -ENOMEM;
 310
 311         raw_spin_lock_init(&t7l66xb->lock);
 312
 313         platform_set_drvdata(dev, t7l66xb);
 314
 315         ret = platform_get_irq(dev, 0);
 316         if (ret >= 0)
 317                 t7l66xb->irq = ret;
 318         else
 319                 goto err_noirq;
 320
 321         t7l66xb->irq_base = pdata->irq_base;
 322
 323         t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
 324         if (IS_ERR(t7l66xb->clk32k)) {
 325                 ret = PTR_ERR(t7l66xb->clk32k);
 326                 goto err_clk32k_get;
 327         }
 328
 329         t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
 330         if (IS_ERR(t7l66xb->clk48m)) {
 331                 ret = PTR_ERR(t7l66xb->clk48m);
 332                 goto err_clk48m_get;
 333         }
 334
 335         rscr = &t7l66xb->rscr;
 336         rscr->name = "t7l66xb-core";
 337         rscr->start = iomem->start;
 338         rscr->end = iomem->start + 0xff;
 339         rscr->flags = IORESOURCE_MEM;
 340
 341         ret = request_resource(iomem, rscr);
 342         if (ret)
 343                 goto err_request_scr;
 344
 345         t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
 346         if (!t7l66xb->scr) {
 347                 ret = -ENOMEM;
 348                 goto err_ioremap;
 349         }
 350
 351         ret = clk_prepare_enable(t7l66xb->clk48m);
 352         if (ret)
 353                 goto err_clk_enable;
 354
 355         if (pdata->enable)
 356                 pdata->enable(dev);
 357
 358         /* Mask all interrupts */
 359         tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
 360
 361         printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
 362                 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
 363                 (unsigned long)iomem->start, t7l66xb->irq);
 364
 365         t7l66xb_attach_irq(dev);
 366
 367         t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
 368         t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);
 369
 370         ret = mfd_add_devices(&dev->dev, dev->id,
 371                               t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
 372                               iomem, t7l66xb->irq_base, NULL);
 373
 374         if (!ret)
 375                 return 0;
 376
 377         t7l66xb_detach_irq(dev);
 378         clk_disable_unprepare(t7l66xb->clk48m);
 379 err_clk_enable:
 380         iounmap(t7l66xb->scr);
 381 err_ioremap:
 382         release_resource(&t7l66xb->rscr);
 383 err_request_scr:
 384         clk_put(t7l66xb->clk48m);
 385 err_clk48m_get:
 386         clk_put(t7l66xb->clk32k);
 387 err_clk32k_get:
 388 err_noirq:
 389         kfree(t7l66xb);
 390         return ret;
 391 }
 392
 393 static int t7l66xb_remove(struct platform_device *dev)
 394 {
 395         struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 396
 397         clk_disable_unprepare(t7l66xb->clk48m);
 398         clk_put(t7l66xb->clk48m);
 399         clk_disable_unprepare(t7l66xb->clk32k);
 400         clk_put(t7l66xb->clk32k);
 401         t7l66xb_detach_irq(dev);
 402         iounmap(t7l66xb->scr);
 403         release_resource(&t7l66xb->rscr);
 404         mfd_remove_devices(&dev->dev);
 405         kfree(t7l66xb);
 406
 407         return 0;
 408 }
 409
 410 static struct platform_driver t7l66xb_platform_driver = {
 411         .driver = {
 412                 .name   = "t7l66xb",
 413         },
 414         .suspend        = pm_sleep_ptr(t7l66xb_suspend),
 415         .resume         = pm_sleep_ptr(t7l66xb_resume),
 416         .probe          = t7l66xb_probe,
 417         .remove         = t7l66xb_remove,
 418 };
 419
 420 /*--------------------------------------------------------------------------*/
 421
 422 module_platform_driver(t7l66xb_platform_driver);
 423
 424 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 425 MODULE_LICENSE("GPL v2");
 426 MODULE_AUTHOR("Ian Molton");
 427 MODULE_ALIAS("platform:t7l66xb");