drivers/mmc/host/sh_mobile_sdhi.c

   1 /*
   2  * SuperH Mobile SDHI
   3  *
   4  * Copyright (C) 2009 Magnus Damm
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Based on "Compaq ASIC3 support":
  11  *
  12  * Copyright 2001 Compaq Computer Corporation.
  13  * Copyright 2004-2005 Phil Blundell
  14  * Copyright 2007-2008 OpenedHand Ltd.
  15  *
  16  * Authors: Phil Blundell <pb@handhelds.org>,
  17  *          Samuel Ortiz <sameo@openedhand.com>
  18  *
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/clk.h>
  23 #include <linux/slab.h>
  24 #include <linux/module.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/mmc/host.h>
  27 #include <linux/mmc/sh_mobile_sdhi.h>
  28 #include <linux/mfd/tmio.h>
  29 #include <linux/sh_dma.h>
  30 #include <linux/delay.h>
  31
  32 #include "tmio_mmc.h"
  33
  34 struct sh_mobile_sdhi {
  35         struct clk *clk;
  36         struct tmio_mmc_data mmc_data;
  37         struct sh_dmae_slave param_tx;
  38         struct sh_dmae_slave param_rx;
  39         struct tmio_mmc_dma dma_priv;
  40 };
  41
  42 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
  43 {
  44         struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
  45         struct tmio_mmc_host *host = mmc_priv(mmc);
  46         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
  47         int ret = clk_enable(priv->clk);
  48         if (ret < 0)
  49                 return ret;
  50
  51         *f = clk_get_rate(priv->clk);
  52         return 0;
  53 }
  54
  55 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
  56 {
  57         struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
  58         struct tmio_mmc_host *host = mmc_priv(mmc);
  59         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
  60         clk_disable(priv->clk);
  61 }
  62
  63 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
  64 {
  65         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  66
  67         p->set_pwr(pdev, state);
  68 }
  69
  70 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
  71 {
  72         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  73
  74         return p->get_cd(pdev);
  75 }
  76
  77 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
  78 {
  79         int timeout = 1000;
  80
  81         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
  82                 udelay(1);
  83
  84         if (!timeout) {
  85                 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
  86                 return -EBUSY;
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
  93 {
  94         switch (addr)
  95         {
  96         case CTL_SD_CMD:
  97         case CTL_STOP_INTERNAL_ACTION:
  98         case CTL_XFER_BLK_COUNT:
  99         case CTL_SD_CARD_CLK_CTL:
 100         case CTL_SD_XFER_LEN:
 101         case CTL_SD_MEM_CARD_OPT:
 102         case CTL_TRANSACTION_CTL:
 103         case CTL_DMA_ENABLE:
 104                 return sh_mobile_sdhi_wait_idle(host);
 105         }
 106
 107         return 0;
 108 }
 109
 110 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
 111 {
 112         mmc_detect_change(dev_get_drvdata(&pdev->dev), msecs_to_jiffies(100));
 113 }
 114
 115 static const struct sh_mobile_sdhi_ops sdhi_ops = {
 116         .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
 117 };
 118
 119 static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
 120 {
 121         struct sh_mobile_sdhi *priv;
 122         struct tmio_mmc_data *mmc_data;
 123         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 124         struct tmio_mmc_host *host;
 125         char clk_name[8];
 126         int irq, ret, i = 0;
 127         bool multiplexed_isr = true;
 128
 129         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 130         if (priv == NULL) {
 131                 dev_err(&pdev->dev, "kzalloc failed\n");
 132                 return -ENOMEM;
 133         }
 134
 135         mmc_data = &priv->mmc_data;
 136         p->pdata = mmc_data;
 137
 138         if (p->init) {
 139                 ret = p->init(pdev, &sdhi_ops);
 140                 if (ret)
 141                         goto einit;
 142         }
 143
 144         snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
 145         priv->clk = clk_get(&pdev->dev, clk_name);
 146         if (IS_ERR(priv->clk)) {
 147                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 148                 ret = PTR_ERR(priv->clk);
 149                 goto eclkget;
 150         }
 151
 152         if (p->set_pwr)
 153                 mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
 154         if (p->get_cd)
 155                 mmc_data->get_cd = sh_mobile_sdhi_get_cd;
 156         mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
 157         mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
 158         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 159         if (p) {
 160                 mmc_data->flags = p->tmio_flags;
 161                 if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
 162                         mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
 163                 mmc_data->ocr_mask = p->tmio_ocr_mask;
 164                 mmc_data->capabilities |= p->tmio_caps;
 165                 mmc_data->capabilities2 |= p->tmio_caps2;
 166                 mmc_data->cd_gpio = p->cd_gpio;
 167
 168                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
 169                         priv->param_tx.slave_id = p->dma_slave_tx;
 170                         priv->param_rx.slave_id = p->dma_slave_rx;
 171                         priv->dma_priv.chan_priv_tx = &priv->param_tx;
 172                         priv->dma_priv.chan_priv_rx = &priv->param_rx;
 173                         priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
 174                         mmc_data->dma = &priv->dma_priv;
 175                 }
 176         }
 177
 178         /*
 179          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 180          * bus width mode.
 181          */
 182         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 183
 184         /*
 185          * All SDHI blocks support SDIO IRQ signalling.
 186          */
 187         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 188
 189         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
 190         if (ret < 0)
 191                 goto eprobe;
 192
 193         /*
 194          * Allow one or more specific (named) ISRs or
 195          * one or more multiplexed (un-named) ISRs.
 196          */
 197
 198         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 199         if (irq >= 0) {
 200                 multiplexed_isr = false;
 201                 ret = request_irq(irq, tmio_mmc_card_detect_irq, 0,
 202                                   dev_name(&pdev->dev), host);
 203                 if (ret)
 204                         goto eirq_card_detect;
 205         }
 206
 207         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 208         if (irq >= 0) {
 209                 multiplexed_isr = false;
 210                 ret = request_irq(irq, tmio_mmc_sdio_irq, 0,
 211                                   dev_name(&pdev->dev), host);
 212                 if (ret)
 213                         goto eirq_sdio;
 214         }
 215
 216         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
 217         if (irq >= 0) {
 218                 multiplexed_isr = false;
 219                 ret = request_irq(irq, tmio_mmc_sdcard_irq, 0,
 220                                   dev_name(&pdev->dev), host);
 221                 if (ret)
 222                         goto eirq_sdcard;
 223         } else if (!multiplexed_isr) {
 224                 dev_err(&pdev->dev,
 225                         "Principal SD-card IRQ is missing among named interrupts\n");
 226                 ret = irq;
 227                 goto eirq_sdcard;
 228         }
 229
 230         if (multiplexed_isr) {
 231                 while (1) {
 232                         irq = platform_get_irq(pdev, i);
 233                         if (irq < 0)
 234                                 break;
 235                         i++;
 236                         ret = request_irq(irq, tmio_mmc_irq, 0,
 237                                           dev_name(&pdev->dev), host);
 238                         if (ret)
 239                                 goto eirq_multiplexed;
 240                 }
 241
 242                 /* There must be at least one IRQ source */
 243                 if (!i)
 244                         goto eirq_multiplexed;
 245         }
 246
 247         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
 248                  mmc_hostname(host->mmc), (unsigned long)
 249                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
 250                  mmc_data->hclk / 1000000);
 251
 252         return ret;
 253
 254 eirq_multiplexed:
 255         while (i--) {
 256                 irq = platform_get_irq(pdev, i);
 257                 free_irq(irq, host);
 258         }
 259 eirq_sdcard:
 260         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 261         if (irq >= 0)
 262                 free_irq(irq, host);
 263 eirq_sdio:
 264         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 265         if (irq >= 0)
 266                 free_irq(irq, host);
 267 eirq_card_detect:
 268         tmio_mmc_host_remove(host);
 269 eprobe:
 270         clk_put(priv->clk);
 271 eclkget:
 272         if (p->cleanup)
 273                 p->cleanup(pdev);
 274 einit:
 275         kfree(priv);
 276         return ret;
 277 }
 278
 279 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 280 {
 281         struct mmc_host *mmc = platform_get_drvdata(pdev);
 282         struct tmio_mmc_host *host = mmc_priv(mmc);
 283         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 284         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 285         int i = 0, irq;
 286
 287         p->pdata = NULL;
 288
 289         tmio_mmc_host_remove(host);
 290
 291         while (1) {
 292                 irq = platform_get_irq(pdev, i++);
 293                 if (irq < 0)
 294                         break;
 295                 free_irq(irq, host);
 296         }
 297
 298         clk_put(priv->clk);
 299
 300         if (p->cleanup)
 301                 p->cleanup(pdev);
 302
 303         kfree(priv);
 304
 305         return 0;
 306 }
 307
 308 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 309         .suspend = tmio_mmc_host_suspend,
 310         .resume = tmio_mmc_host_resume,
 311         .runtime_suspend = tmio_mmc_host_runtime_suspend,
 312         .runtime_resume = tmio_mmc_host_runtime_resume,
 313 };
 314
 315 static struct platform_driver sh_mobile_sdhi_driver = {
 316         .driver         = {
 317                 .name   = "sh_mobile_sdhi",
 318                 .owner  = THIS_MODULE,
 319                 .pm     = &tmio_mmc_dev_pm_ops,
 320         },
 321         .probe          = sh_mobile_sdhi_probe,
 322         .remove         = __devexit_p(sh_mobile_sdhi_remove),
 323 };
 324
 325 module_platform_driver(sh_mobile_sdhi_driver);
 326
 327 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 328 MODULE_AUTHOR("Magnus Damm");
 329 MODULE_LICENSE("GPL v2");
 330 MODULE_ALIAS("platform:sh_mobile_sdhi");