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 int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
  94 {
  95         struct sh_mobile_sdhi *priv;
  96         struct tmio_mmc_data *mmc_data;
  97         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  98         struct tmio_mmc_host *host;
  99         char clk_name[8];
 100         int irq, ret, i = 0;
 101         bool multiplexed_isr = true;
 102
 103         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 104         if (priv == NULL) {
 105                 dev_err(&pdev->dev, "kzalloc failed\n");
 106                 return -ENOMEM;
 107         }
 108
 109         mmc_data = &priv->mmc_data;
 110         p->pdata = mmc_data;
 111
 112         snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
 113         priv->clk = clk_get(&pdev->dev, clk_name);
 114         if (IS_ERR(priv->clk)) {
 115                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 116                 ret = PTR_ERR(priv->clk);
 117                 goto eclkget;
 118         }
 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         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 124         if (p) {
 125                 mmc_data->flags = p->tmio_flags;
 126                 if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
 127                         mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
 128                 mmc_data->ocr_mask = p->tmio_ocr_mask;
 129                 mmc_data->capabilities |= p->tmio_caps;
 130                 mmc_data->cd_gpio = p->cd_gpio;
 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_put(priv->clk);
 235 eclkget:
 236         kfree(priv);
 237         return ret;
 238 }
 239
 240 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 241 {
 242         struct mmc_host *mmc = platform_get_drvdata(pdev);
 243         struct tmio_mmc_host *host = mmc_priv(mmc);
 244         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 245         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 246         int i = 0, irq;
 247
 248         p->pdata = NULL;
 249
 250         tmio_mmc_host_remove(host);
 251
 252         while (1) {
 253                 irq = platform_get_irq(pdev, i++);
 254                 if (irq < 0)
 255                         break;
 256                 free_irq(irq, host);
 257         }
 258
 259         clk_put(priv->clk);
 260         kfree(priv);
 261
 262         return 0;
 263 }
 264
 265 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 266         .suspend = tmio_mmc_host_suspend,
 267         .resume = tmio_mmc_host_resume,
 268         .runtime_suspend = tmio_mmc_host_runtime_suspend,
 269         .runtime_resume = tmio_mmc_host_runtime_resume,
 270 };
 271
 272 static struct platform_driver sh_mobile_sdhi_driver = {
 273         .driver         = {
 274                 .name   = "sh_mobile_sdhi",
 275                 .owner  = THIS_MODULE,
 276                 .pm     = &tmio_mmc_dev_pm_ops,
 277         },
 278         .probe          = sh_mobile_sdhi_probe,
 279         .remove         = __devexit_p(sh_mobile_sdhi_remove),
 280 };
 281
 282 module_platform_driver(sh_mobile_sdhi_driver);
 283
 284 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 285 MODULE_AUTHOR("Magnus Damm");
 286 MODULE_LICENSE("GPL v2");
 287 MODULE_ALIAS("platform:sh_mobile_sdhi");