drivers/mfd/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/mfd/core.h>
  27 #include <linux/mfd/tmio.h>
  28 #include <linux/mfd/sh_mobile_sdhi.h>
  29 #include <linux/sh_dma.h>
  30
  31 struct sh_mobile_sdhi {
  32         struct clk *clk;
  33         struct tmio_mmc_data mmc_data;
  34         struct mfd_cell cell_mmc;
  35         struct sh_dmae_slave param_tx;
  36         struct sh_dmae_slave param_rx;
  37         struct tmio_mmc_dma dma_priv;
  38 };
  39
  40 static struct resource sh_mobile_sdhi_resources[] = {
  41         {
  42                 .start = 0x000,
  43                 .end   = 0x1ff,
  44                 .flags = IORESOURCE_MEM,
  45         },
  46         {
  47                 .start = 0,
  48                 .end   = 0,
  49                 .flags = IORESOURCE_IRQ,
  50         },
  51 };
  52
  53 static struct mfd_cell sh_mobile_sdhi_cell = {
  54         .name          = "tmio-mmc",
  55         .num_resources = ARRAY_SIZE(sh_mobile_sdhi_resources),
  56         .resources     = sh_mobile_sdhi_resources,
  57 };
  58
  59 static void sh_mobile_sdhi_set_pwr(struct platform_device *tmio, int state)
  60 {
  61         struct platform_device *pdev = to_platform_device(tmio->dev.parent);
  62         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  63
  64         if (p && p->set_pwr)
  65                 p->set_pwr(pdev, state);
  66 }
  67
  68 static int sh_mobile_sdhi_get_cd(struct platform_device *tmio)
  69 {
  70         struct platform_device *pdev = to_platform_device(tmio->dev.parent);
  71         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  72
  73         if (p && p->get_cd)
  74                 return p->get_cd(pdev);
  75         else
  76                 return -ENOSYS;
  77 }
  78
  79 static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
  80 {
  81         struct sh_mobile_sdhi *priv;
  82         struct tmio_mmc_data *mmc_data;
  83         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  84         struct resource *mem;
  85         char clk_name[8];
  86         int ret, irq;
  87
  88         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  89         if (!mem)
  90                 dev_err(&pdev->dev, "missing MEM resource\n");
  91
  92         irq = platform_get_irq(pdev, 0);
  93         if (irq < 0)
  94                 dev_err(&pdev->dev, "missing IRQ resource\n");
  95
  96         if (!mem || (irq < 0))
  97                 return -EINVAL;
  98
  99         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 100         if (priv == NULL) {
 101                 dev_err(&pdev->dev, "kzalloc failed\n");
 102                 return -ENOMEM;
 103         }
 104
 105         mmc_data = &priv->mmc_data;
 106
 107         snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
 108         priv->clk = clk_get(&pdev->dev, clk_name);
 109         if (IS_ERR(priv->clk)) {
 110                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 111                 ret = PTR_ERR(priv->clk);
 112                 kfree(priv);
 113                 return ret;
 114         }
 115
 116         clk_enable(priv->clk);
 117
 118         mmc_data->hclk = clk_get_rate(priv->clk);
 119         mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
 120         mmc_data->get_cd = sh_mobile_sdhi_get_cd;
 121         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 122         if (p) {
 123                 mmc_data->flags = p->tmio_flags;
 124                 mmc_data->ocr_mask = p->tmio_ocr_mask;
 125                 mmc_data->capabilities |= p->tmio_caps;
 126         }
 127
 128         /*
 129          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 130          * bus width mode.
 131          */
 132         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 133
 134         /*
 135          * All SDHI blocks support SDIO IRQ signalling.
 136          */
 137         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 138
 139         if (p && p->dma_slave_tx >= 0 && p->dma_slave_rx >= 0) {
 140                 priv->param_tx.slave_id = p->dma_slave_tx;
 141                 priv->param_rx.slave_id = p->dma_slave_rx;
 142                 priv->dma_priv.chan_priv_tx = &priv->param_tx;
 143                 priv->dma_priv.chan_priv_rx = &priv->param_rx;
 144                 priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
 145                 mmc_data->dma = &priv->dma_priv;
 146         }
 147
 148         memcpy(&priv->cell_mmc, &sh_mobile_sdhi_cell, sizeof(priv->cell_mmc));
 149         priv->cell_mmc.driver_data = mmc_data;
 150         priv->cell_mmc.platform_data = &priv->cell_mmc;
 151         priv->cell_mmc.data_size = sizeof(priv->cell_mmc);
 152
 153         platform_set_drvdata(pdev, priv);
 154
 155         ret = mfd_add_devices(&pdev->dev, pdev->id,
 156                               &priv->cell_mmc, 1, mem, irq);
 157         if (ret) {
 158                 clk_disable(priv->clk);
 159                 clk_put(priv->clk);
 160                 kfree(priv);
 161         }
 162
 163         return ret;
 164 }
 165
 166 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 167 {
 168         struct sh_mobile_sdhi *priv = platform_get_drvdata(pdev);
 169
 170         mfd_remove_devices(&pdev->dev);
 171         clk_disable(priv->clk);
 172         clk_put(priv->clk);
 173         kfree(priv);
 174
 175         return 0;
 176 }
 177
 178 static struct platform_driver sh_mobile_sdhi_driver = {
 179         .driver         = {
 180                 .name   = "sh_mobile_sdhi",
 181                 .owner  = THIS_MODULE,
 182         },
 183         .probe          = sh_mobile_sdhi_probe,
 184         .remove         = __devexit_p(sh_mobile_sdhi_remove),
 185 };
 186
 187 static int __init sh_mobile_sdhi_init(void)
 188 {
 189         return platform_driver_register(&sh_mobile_sdhi_driver);
 190 }
 191
 192 static void __exit sh_mobile_sdhi_exit(void)
 193 {
 194         platform_driver_unregister(&sh_mobile_sdhi_driver);
 195 }
 196
 197 module_init(sh_mobile_sdhi_init);
 198 module_exit(sh_mobile_sdhi_exit);
 199
 200 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 201 MODULE_AUTHOR("Magnus Damm");
 202 MODULE_LICENSE("GPL v2");