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/platform_device.h>
  25 #include <linux/mmc/host.h>
  26 #include <linux/mmc/sh_mobile_sdhi.h>
  27 #include <linux/mfd/tmio.h>
  28 #include <linux/sh_dma.h>
  29 #include <linux/delay.h>
  30
  31 #include "tmio_mmc.h"
  32
  33 struct sh_mobile_sdhi {
  34         struct clk *clk;
  35         struct tmio_mmc_data mmc_data;
  36         struct sh_dmae_slave param_tx;
  37         struct sh_dmae_slave param_rx;
  38         struct tmio_mmc_dma dma_priv;
  39 };
  40
  41 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
  42 {
  43         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  44
  45         if (p && p->set_pwr)
  46                 p->set_pwr(pdev, state);
  47 }
  48
  49 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
  50 {
  51         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  52
  53         if (p && p->get_cd)
  54                 return p->get_cd(pdev);
  55         else
  56                 return -ENOSYS;
  57 }
  58
  59 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
  60 {
  61         int timeout = 1000;
  62
  63         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
  64                 udelay(1);
  65
  66         if (!timeout) {
  67                 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
  68                 return -EBUSY;
  69         }
  70
  71         return 0;
  72 }
  73
  74 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
  75 {
  76         switch (addr)
  77         {
  78         case CTL_SD_CMD:
  79         case CTL_STOP_INTERNAL_ACTION:
  80         case CTL_XFER_BLK_COUNT:
  81         case CTL_SD_CARD_CLK_CTL:
  82         case CTL_SD_XFER_LEN:
  83         case CTL_SD_MEM_CARD_OPT:
  84         case CTL_TRANSACTION_CTL:
  85         case CTL_DMA_ENABLE:
  86                 return sh_mobile_sdhi_wait_idle(host);
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
  93 {
  94         struct sh_mobile_sdhi *priv;
  95         struct tmio_mmc_data *mmc_data;
  96         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  97         struct tmio_mmc_host *host;
  98         char clk_name[8];
  99         int i, irq, ret;
 100
 101         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 102         if (priv == NULL) {
 103                 dev_err(&pdev->dev, "kzalloc failed\n");
 104                 return -ENOMEM;
 105         }
 106
 107         mmc_data = &priv->mmc_data;
 108         p->pdata = mmc_data;
 109
 110         snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
 111         priv->clk = clk_get(&pdev->dev, clk_name);
 112         if (IS_ERR(priv->clk)) {
 113                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 114                 ret = PTR_ERR(priv->clk);
 115                 goto eclkget;
 116         }
 117
 118         clk_enable(priv->clk);
 119
 120         mmc_data->hclk = clk_get_rate(priv->clk);
 121         mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
 122         mmc_data->get_cd = sh_mobile_sdhi_get_cd;
 123         if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
 124                 mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
 125         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 126         if (p) {
 127                 mmc_data->flags = p->tmio_flags;
 128                 mmc_data->ocr_mask = p->tmio_ocr_mask;
 129                 mmc_data->capabilities |= p->tmio_caps;
 130
 131                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
 132                         priv->param_tx.slave_id = p->dma_slave_tx;
 133                         priv->param_rx.slave_id = p->dma_slave_rx;
 134                         priv->dma_priv.chan_priv_tx = &priv->param_tx;
 135                         priv->dma_priv.chan_priv_rx = &priv->param_rx;
 136                         priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
 137                         mmc_data->dma = &priv->dma_priv;
 138                 }
 139         }
 140
 141         /*
 142          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 143          * bus width mode.
 144          */
 145         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 146
 147         /*
 148          * All SDHI blocks support SDIO IRQ signalling.
 149          */
 150         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 151
 152         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
 153         if (ret < 0)
 154                 goto eprobe;
 155
 156         for (i = 0; i < 3; i++) {
 157                 irq = platform_get_irq(pdev, i);
 158                 if (irq < 0) {
 159                         if (i) {
 160                                 continue;
 161                         } else {
 162                                 ret = irq;
 163                                 goto eirq;
 164                         }
 165                 }
 166                 ret = request_irq(irq, tmio_mmc_irq, 0,
 167                                   dev_name(&pdev->dev), host);
 168                 if (ret) {
 169                         while (i--) {
 170                                 irq = platform_get_irq(pdev, i);
 171                                 if (irq >= 0)
 172                                         free_irq(irq, host);
 173                         }
 174                         goto eirq;
 175                 }
 176         }
 177         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
 178                  mmc_hostname(host->mmc), (unsigned long)
 179                  (platform_get_resource(pdev,IORESOURCE_MEM, 0)->start),
 180                  mmc_data->hclk / 1000000);
 181
 182         return ret;
 183
 184 eirq:
 185         tmio_mmc_host_remove(host);
 186 eprobe:
 187         clk_disable(priv->clk);
 188         clk_put(priv->clk);
 189 eclkget:
 190         kfree(priv);
 191         return ret;
 192 }
 193
 194 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 195 {
 196         struct mmc_host *mmc = platform_get_drvdata(pdev);
 197         struct tmio_mmc_host *host = mmc_priv(mmc);
 198         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 199         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 200         int i, irq;
 201
 202         p->pdata = NULL;
 203
 204         tmio_mmc_host_remove(host);
 205
 206         for (i = 0; i < 3; i++) {
 207                 irq = platform_get_irq(pdev, i);
 208                 if (irq >= 0)
 209                         free_irq(irq, host);
 210         }
 211
 212         clk_disable(priv->clk);
 213         clk_put(priv->clk);
 214         kfree(priv);
 215
 216         return 0;
 217 }
 218
 219 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 220         .suspend = tmio_mmc_host_suspend,
 221         .resume = tmio_mmc_host_resume,
 222         .runtime_suspend = tmio_mmc_host_runtime_suspend,
 223         .runtime_resume = tmio_mmc_host_runtime_resume,
 224 };
 225
 226 static struct platform_driver sh_mobile_sdhi_driver = {
 227         .driver         = {
 228                 .name   = "sh_mobile_sdhi",
 229                 .owner  = THIS_MODULE,
 230                 .pm     = &tmio_mmc_dev_pm_ops,
 231         },
 232         .probe          = sh_mobile_sdhi_probe,
 233         .remove         = __devexit_p(sh_mobile_sdhi_remove),
 234 };
 235
 236 static int __init sh_mobile_sdhi_init(void)
 237 {
 238         return platform_driver_register(&sh_mobile_sdhi_driver);
 239 }
 240
 241 static void __exit sh_mobile_sdhi_exit(void)
 242 {
 243         platform_driver_unregister(&sh_mobile_sdhi_driver);
 244 }
 245
 246 module_init(sh_mobile_sdhi_init);
 247 module_exit(sh_mobile_sdhi_exit);
 248
 249 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 250 MODULE_AUTHOR("Magnus Damm");
 251 MODULE_LICENSE("GPL v2");
 252 MODULE_ALIAS("platform:sh_mobile_sdhi");