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/mod_devicetable.h>
  25 #include <linux/module.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/mmc/host.h>
  28 #include <linux/mmc/sh_mobile_sdhi.h>
  29 #include <linux/mfd/tmio.h>
  30 #include <linux/sh_dma.h>
  31 #include <linux/delay.h>
  32
  33 #include "tmio_mmc.h"
  34
  35 struct sh_mobile_sdhi {
  36         struct clk *clk;
  37         struct tmio_mmc_data mmc_data;
  38         struct sh_dmae_slave param_tx;
  39         struct sh_dmae_slave param_rx;
  40         struct tmio_mmc_dma dma_priv;
  41 };
  42
  43 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
  44 {
  45         struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
  46         struct tmio_mmc_host *host = mmc_priv(mmc);
  47         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
  48         int ret = clk_enable(priv->clk);
  49         if (ret < 0)
  50                 return ret;
  51
  52         *f = clk_get_rate(priv->clk);
  53         return 0;
  54 }
  55
  56 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
  57 {
  58         struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
  59         struct tmio_mmc_host *host = mmc_priv(mmc);
  60         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
  61         clk_disable(priv->clk);
  62 }
  63
  64 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
  65 {
  66         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  67
  68         p->set_pwr(pdev, state);
  69 }
  70
  71 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
  72 {
  73         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  74
  75         return p->get_cd(pdev);
  76 }
  77
  78 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
  79 {
  80         int timeout = 1000;
  81
  82         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
  83                 udelay(1);
  84
  85         if (!timeout) {
  86                 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
  87                 return -EBUSY;
  88         }
  89
  90         return 0;
  91 }
  92
  93 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
  94 {
  95         switch (addr)
  96         {
  97         case CTL_SD_CMD:
  98         case CTL_STOP_INTERNAL_ACTION:
  99         case CTL_XFER_BLK_COUNT:
 100         case CTL_SD_CARD_CLK_CTL:
 101         case CTL_SD_XFER_LEN:
 102         case CTL_SD_MEM_CARD_OPT:
 103         case CTL_TRANSACTION_CTL:
 104         case CTL_DMA_ENABLE:
 105                 return sh_mobile_sdhi_wait_idle(host);
 106         }
 107
 108         return 0;
 109 }
 110
 111 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
 112 {
 113         mmc_detect_change(dev_get_drvdata(&pdev->dev), msecs_to_jiffies(100));
 114 }
 115
 116 static const struct sh_mobile_sdhi_ops sdhi_ops = {
 117         .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
 118 };
 119
 120 static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
 121 {
 122         struct sh_mobile_sdhi *priv;
 123         struct tmio_mmc_data *mmc_data;
 124         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 125         struct tmio_mmc_host *host;
 126         char clk_name[8];
 127         int irq, ret, i = 0;
 128         bool multiplexed_isr = true;
 129
 130         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 131         if (priv == NULL) {
 132                 dev_err(&pdev->dev, "kzalloc failed\n");
 133                 return -ENOMEM;
 134         }
 135
 136         mmc_data = &priv->mmc_data;
 137
 138         if (p) {
 139                 p->pdata = mmc_data;
 140                 if (p->init) {
 141                         ret = p->init(pdev, &sdhi_ops);
 142                         if (ret)
 143                                 goto einit;
 144                 }
 145         }
 146
 147         snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
 148         priv->clk = clk_get(&pdev->dev, clk_name);
 149         if (IS_ERR(priv->clk)) {
 150                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 151                 ret = PTR_ERR(priv->clk);
 152                 goto eclkget;
 153         }
 154
 155         mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
 156         mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
 157         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 158         if (p) {
 159                 mmc_data->flags = p->tmio_flags;
 160                 if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
 161                         mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
 162                 mmc_data->ocr_mask = p->tmio_ocr_mask;
 163                 mmc_data->capabilities |= p->tmio_caps;
 164                 mmc_data->capabilities2 |= p->tmio_caps2;
 165                 mmc_data->cd_gpio = p->cd_gpio;
 166                 if (p->set_pwr)
 167                         mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
 168                 if (p->get_cd)
 169                         mmc_data->get_cd = sh_mobile_sdhi_get_cd;
 170
 171                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
 172                         priv->param_tx.shdma_slave.slave_id = p->dma_slave_tx;
 173                         priv->param_rx.shdma_slave.slave_id = p->dma_slave_rx;
 174                         priv->dma_priv.chan_priv_tx = &priv->param_tx.shdma_slave;
 175                         priv->dma_priv.chan_priv_rx = &priv->param_rx.shdma_slave;
 176                         priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
 177                         mmc_data->dma = &priv->dma_priv;
 178                 }
 179         }
 180
 181         /*
 182          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 183          * bus width mode.
 184          */
 185         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 186
 187         /*
 188          * All SDHI blocks support SDIO IRQ signalling.
 189          */
 190         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 191
 192         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
 193         if (ret < 0)
 194                 goto eprobe;
 195
 196         /*
 197          * Allow one or more specific (named) ISRs or
 198          * one or more multiplexed (un-named) ISRs.
 199          */
 200
 201         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 202         if (irq >= 0) {
 203                 multiplexed_isr = false;
 204                 ret = request_irq(irq, tmio_mmc_card_detect_irq, 0,
 205                                   dev_name(&pdev->dev), host);
 206                 if (ret)
 207                         goto eirq_card_detect;
 208         }
 209
 210         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 211         if (irq >= 0) {
 212                 multiplexed_isr = false;
 213                 ret = request_irq(irq, tmio_mmc_sdio_irq, 0,
 214                                   dev_name(&pdev->dev), host);
 215                 if (ret)
 216                         goto eirq_sdio;
 217         }
 218
 219         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
 220         if (irq >= 0) {
 221                 multiplexed_isr = false;
 222                 ret = request_irq(irq, tmio_mmc_sdcard_irq, 0,
 223                                   dev_name(&pdev->dev), host);
 224                 if (ret)
 225                         goto eirq_sdcard;
 226         } else if (!multiplexed_isr) {
 227                 dev_err(&pdev->dev,
 228                         "Principal SD-card IRQ is missing among named interrupts\n");
 229                 ret = irq;
 230                 goto eirq_sdcard;
 231         }
 232
 233         if (multiplexed_isr) {
 234                 while (1) {
 235                         irq = platform_get_irq(pdev, i);
 236                         if (irq < 0)
 237                                 break;
 238                         i++;
 239                         ret = request_irq(irq, tmio_mmc_irq, 0,
 240                                           dev_name(&pdev->dev), host);
 241                         if (ret)
 242                                 goto eirq_multiplexed;
 243                 }
 244
 245                 /* There must be at least one IRQ source */
 246                 if (!i)
 247                         goto eirq_multiplexed;
 248         }
 249
 250         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
 251                  mmc_hostname(host->mmc), (unsigned long)
 252                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
 253                  mmc_data->hclk / 1000000);
 254
 255         return ret;
 256
 257 eirq_multiplexed:
 258         while (i--) {
 259                 irq = platform_get_irq(pdev, i);
 260                 free_irq(irq, host);
 261         }
 262 eirq_sdcard:
 263         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 264         if (irq >= 0)
 265                 free_irq(irq, host);
 266 eirq_sdio:
 267         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 268         if (irq >= 0)
 269                 free_irq(irq, host);
 270 eirq_card_detect:
 271         tmio_mmc_host_remove(host);
 272 eprobe:
 273         clk_put(priv->clk);
 274 eclkget:
 275         if (p && p->cleanup)
 276                 p->cleanup(pdev);
 277 einit:
 278         kfree(priv);
 279         return ret;
 280 }
 281
 282 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 283 {
 284         struct mmc_host *mmc = platform_get_drvdata(pdev);
 285         struct tmio_mmc_host *host = mmc_priv(mmc);
 286         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 287         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 288         int i = 0, irq;
 289
 290         if (p)
 291                 p->pdata = NULL;
 292
 293         tmio_mmc_host_remove(host);
 294
 295         while (1) {
 296                 irq = platform_get_irq(pdev, i++);
 297                 if (irq < 0)
 298                         break;
 299                 free_irq(irq, host);
 300         }
 301
 302         clk_put(priv->clk);
 303
 304         if (p && p->cleanup)
 305                 p->cleanup(pdev);
 306
 307         kfree(priv);
 308
 309         return 0;
 310 }
 311
 312 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 313         .suspend = tmio_mmc_host_suspend,
 314         .resume = tmio_mmc_host_resume,
 315         .runtime_suspend = tmio_mmc_host_runtime_suspend,
 316         .runtime_resume = tmio_mmc_host_runtime_resume,
 317 };
 318
 319 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
 320         { .compatible = "renesas,shmobile-sdhi" },
 321         { }
 322 };
 323 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
 324
 325 static struct platform_driver sh_mobile_sdhi_driver = {
 326         .driver         = {
 327                 .name   = "sh_mobile_sdhi",
 328                 .owner  = THIS_MODULE,
 329                 .pm     = &tmio_mmc_dev_pm_ops,
 330                 .of_match_table = sh_mobile_sdhi_of_match,
 331         },
 332         .probe          = sh_mobile_sdhi_probe,
 333         .remove         = __devexit_p(sh_mobile_sdhi_remove),
 334 };
 335
 336 module_platform_driver(sh_mobile_sdhi_driver);
 337
 338 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 339 MODULE_AUTHOR("Magnus Damm");
 340 MODULE_LICENSE("GPL v2");
 341 MODULE_ALIAS("platform:sh_mobile_sdhi");