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