linux/drivers/mfd/t7l66xb.c
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   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
  37enum {
  38        T7L66XB_CELL_NAND,
  39        T7L66XB_CELL_MMC,
  40};
  41
  42static 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
  69struct 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
  83static 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
 106static 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
 126static 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
 134static 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
 144static 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
 150static 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
 168static 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 */
 188static 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
 203static 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
 216static 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
 229static 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 */
 239static 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
 259static 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
 281static 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
 293static 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
 314static 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);
 398err_ioremap:
 399        release_resource(&t7l66xb->rscr);
 400err_request_scr:
 401        clk_put(t7l66xb->clk48m);
 402err_clk48m_get:
 403        clk_put(t7l66xb->clk32k);
 404err_clk32k_get:
 405err_noirq:
 406        kfree(t7l66xb);
 407        return ret;
 408}
 409
 410static 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
 431static 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
 444module_platform_driver(t7l66xb_platform_driver);
 445
 446MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 447MODULE_LICENSE("GPL v2");
 448MODULE_AUTHOR("Ian Molton");
 449MODULE_ALIAS("platform:t7l66xb");
 450
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