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 irq, ret, i = 0;
 100         bool multiplexed_isr = true;
 101
 102         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 103         if (priv == NULL) {
 104                 dev_err(&pdev->dev, "kzalloc failed\n");
 105                 return -ENOMEM;
 106         }
 107
 108         mmc_data = &priv->mmc_data;
 109         p->pdata = mmc_data;
 110
 111         snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
 112         priv->clk = clk_get(&pdev->dev, clk_name);
 113         if (IS_ERR(priv->clk)) {
 114                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 115                 ret = PTR_ERR(priv->clk);
 116                 goto eclkget;
 117         }
 118
 119         clk_enable(priv->clk);
 120
 121         mmc_data->hclk = clk_get_rate(priv->clk);
 122         mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
 123         mmc_data->get_cd = sh_mobile_sdhi_get_cd;
 124         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 125         if (p) {
 126                 mmc_data->flags = p->tmio_flags;
 127                 if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
 128                         mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
 129                 mmc_data->ocr_mask = p->tmio_ocr_mask;
 130                 mmc_data->capabilities |= p->tmio_caps;
 131
 132                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
 133                         priv->param_tx.slave_id = p->dma_slave_tx;
 134                         priv->param_rx.slave_id = p->dma_slave_rx;
 135                         priv->dma_priv.chan_priv_tx = &priv->param_tx;
 136                         priv->dma_priv.chan_priv_rx = &priv->param_rx;
 137                         priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
 138                         mmc_data->dma = &priv->dma_priv;
 139                 }
 140         }
 141
 142         /*
 143          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 144          * bus width mode.
 145          */
 146         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 147
 148         /*
 149          * All SDHI blocks support SDIO IRQ signalling.
 150          */
 151         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 152
 153         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
 154         if (ret < 0)
 155                 goto eprobe;
 156
 157         /*
 158          * Allow one or more specific (named) ISRs or
 159          * one or more multiplexed (un-named) ISRs.
 160          */
 161
 162         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 163         if (irq >= 0) {
 164                 multiplexed_isr = false;
 165                 ret = request_irq(irq, tmio_mmc_card_detect_irq, 0,
 166                                   dev_name(&pdev->dev), host);
 167                 if (ret)
 168                         goto eirq_card_detect;
 169         }
 170
 171         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 172         if (irq >= 0) {
 173                 multiplexed_isr = false;
 174                 ret = request_irq(irq, tmio_mmc_sdio_irq, 0,
 175                                   dev_name(&pdev->dev), host);
 176                 if (ret)
 177                         goto eirq_sdio;
 178         }
 179
 180         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
 181         if (irq >= 0) {
 182                 multiplexed_isr = false;
 183                 ret = request_irq(irq, tmio_mmc_sdcard_irq, 0,
 184                                   dev_name(&pdev->dev), host);
 185                 if (ret)
 186                         goto eirq_sdcard;
 187         } else if (!multiplexed_isr) {
 188                 dev_err(&pdev->dev,
 189                         "Principal SD-card IRQ is missing among named interrupts\n");
 190                 ret = irq;
 191                 goto eirq_sdcard;
 192         }
 193
 194         if (multiplexed_isr) {
 195                 while (1) {
 196                         irq = platform_get_irq(pdev, i);
 197                         if (irq < 0)
 198                                 break;
 199                         i++;
 200                         ret = request_irq(irq, tmio_mmc_irq, 0,
 201                                           dev_name(&pdev->dev), host);
 202                         if (ret)
 203                                 goto eirq_multiplexed;
 204                 }
 205
 206                 /* There must be at least one IRQ source */
 207                 if (!i)
 208                         goto eirq_multiplexed;
 209         }
 210
 211         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
 212                  mmc_hostname(host->mmc), (unsigned long)
 213                  (platform_get_resource(pdev,IORESOURCE_MEM, 0)->start),
 214                  mmc_data->hclk / 1000000);
 215
 216         return ret;
 217
 218 eirq_multiplexed:
 219         while (i--) {
 220                 irq = platform_get_irq(pdev, i);
 221                 free_irq(irq, host);
 222         }
 223 eirq_sdcard:
 224         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 225         if (irq >= 0)
 226                 free_irq(irq, host);
 227 eirq_sdio:
 228         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 229         if (irq >= 0)
 230                 free_irq(irq, host);
 231 eirq_card_detect:
 232         tmio_mmc_host_remove(host);
 233 eprobe:
 234         clk_disable(priv->clk);
 235         clk_put(priv->clk);
 236 eclkget:
 237         kfree(priv);
 238         return ret;
 239 }
 240
 241 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 242 {
 243         struct mmc_host *mmc = platform_get_drvdata(pdev);
 244         struct tmio_mmc_host *host = mmc_priv(mmc);
 245         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 246         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 247         int i = 0, irq;
 248
 249         p->pdata = NULL;
 250
 251         tmio_mmc_host_remove(host);
 252
 253         while (1) {
 254                 irq = platform_get_irq(pdev, i++);
 255                 if (irq < 0)
 256                         break;
 257                 free_irq(irq, host);
 258         }
 259
 260         clk_disable(priv->clk);
 261         clk_put(priv->clk);
 262         kfree(priv);
 263
 264         return 0;
 265 }
 266
 267 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 268         .suspend = tmio_mmc_host_suspend,
 269         .resume = tmio_mmc_host_resume,
 270         .runtime_suspend = tmio_mmc_host_runtime_suspend,
 271         .runtime_resume = tmio_mmc_host_runtime_resume,
 272 };
 273
 274 static struct platform_driver sh_mobile_sdhi_driver = {
 275         .driver         = {
 276                 .name   = "sh_mobile_sdhi",
 277                 .owner  = THIS_MODULE,
 278                 .pm     = &tmio_mmc_dev_pm_ops,
 279         },
 280         .probe          = sh_mobile_sdhi_probe,
 281         .remove         = __devexit_p(sh_mobile_sdhi_remove),
 282 };
 283
 284 static int __init sh_mobile_sdhi_init(void)
 285 {
 286         return platform_driver_register(&sh_mobile_sdhi_driver);
 287 }
 288
 289 static void __exit sh_mobile_sdhi_exit(void)
 290 {
 291         platform_driver_unregister(&sh_mobile_sdhi_driver);
 292 }
 293
 294 module_init(sh_mobile_sdhi_init);
 295 module_exit(sh_mobile_sdhi_exit);
 296
 297 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 298 MODULE_AUTHOR("Magnus Damm");
 299 MODULE_LICENSE("GPL v2");
 300 MODULE_ALIAS("platform:sh_mobile_sdhi");