drivers/mmc/host/sdhci-dove.c

   1 /*
   2  * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC
   3  *
   4  * Author: Saeed Bishara <saeed@marvell.com>
   5  *         Mike Rapoport <mike@compulab.co.il>
   6  * Based on sdhci-cns3xxx.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/clk.h>
  23 #include <linux/err.h>
  24 #include <linux/gpio.h>
  25 #include <linux/io.h>
  26 #include <linux/mmc/host.h>
  27 #include <linux/module.h>
  28 #include <linux/of.h>
  29 #include <linux/of_gpio.h>
  30
  31 #include "sdhci-pltfm.h"
  32
  33 struct sdhci_dove_priv {
  34         struct clk *clk;
  35         int gpio_cd;
  36 };
  37
  38 static irqreturn_t sdhci_dove_carddetect_irq(int irq, void *data)
  39 {
  40         struct sdhci_host *host = data;
  41
  42         tasklet_schedule(&host->card_tasklet);
  43         return IRQ_HANDLED;
  44 }
  45
  46 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
  47 {
  48         u16 ret;
  49
  50         switch (reg) {
  51         case SDHCI_HOST_VERSION:
  52         case SDHCI_SLOT_INT_STATUS:
  53                 /* those registers don't exist */
  54                 return 0;
  55         default:
  56                 ret = readw(host->ioaddr + reg);
  57         }
  58         return ret;
  59 }
  60
  61 static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
  62 {
  63         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  64         struct sdhci_dove_priv *priv = pltfm_host->priv;
  65         u32 ret;
  66
  67         ret = readl(host->ioaddr + reg);
  68
  69         switch (reg) {
  70         case SDHCI_CAPABILITIES:
  71                 /* Mask the support for 3.0V */
  72                 ret &= ~SDHCI_CAN_VDD_300;
  73                 break;
  74         case SDHCI_PRESENT_STATE:
  75                 if (gpio_is_valid(priv->gpio_cd)) {
  76                         if (gpio_get_value(priv->gpio_cd) == 0)
  77                                 ret |= SDHCI_CARD_PRESENT;
  78                         else
  79                                 ret &= ~SDHCI_CARD_PRESENT;
  80                 }
  81                 break;
  82         }
  83         return ret;
  84 }
  85
  86 static const struct sdhci_ops sdhci_dove_ops = {
  87         .read_w = sdhci_dove_readw,
  88         .read_l = sdhci_dove_readl,
  89 };
  90
  91 static const struct sdhci_pltfm_data sdhci_dove_pdata = {
  92         .ops    = &sdhci_dove_ops,
  93         .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
  94                   SDHCI_QUIRK_NO_BUSY_IRQ |
  95                   SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
  96                   SDHCI_QUIRK_FORCE_DMA |
  97                   SDHCI_QUIRK_NO_HISPD_BIT,
  98 };
  99
 100 static int sdhci_dove_probe(struct platform_device *pdev)
 101 {
 102         struct sdhci_host *host;
 103         struct sdhci_pltfm_host *pltfm_host;
 104         struct sdhci_dove_priv *priv;
 105         int ret;
 106
 107         priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv),
 108                             GFP_KERNEL);
 109         if (!priv) {
 110                 dev_err(&pdev->dev, "unable to allocate private data");
 111                 return -ENOMEM;
 112         }
 113
 114         priv->clk = devm_clk_get(&pdev->dev, NULL);
 115
 116         if (pdev->dev.of_node) {
 117                 priv->gpio_cd = of_get_named_gpio(pdev->dev.of_node,
 118                                                   "cd-gpios", 0);
 119         } else {
 120                 priv->gpio_cd = -EINVAL;
 121         }
 122
 123         if (gpio_is_valid(priv->gpio_cd)) {
 124                 ret = gpio_request(priv->gpio_cd, "sdhci-cd");
 125                 if (ret) {
 126                         dev_err(&pdev->dev, "card detect gpio request failed: %d\n",
 127                                 ret);
 128                         return ret;
 129                 }
 130                 gpio_direction_input(priv->gpio_cd);
 131         }
 132
 133         host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0);
 134         if (IS_ERR(host)) {
 135                 ret = PTR_ERR(host);
 136                 goto err_sdhci_pltfm_init;
 137         }
 138
 139         pltfm_host = sdhci_priv(host);
 140         pltfm_host->priv = priv;
 141
 142         if (!IS_ERR(priv->clk))
 143                 clk_prepare_enable(priv->clk);
 144
 145         sdhci_get_of_property(pdev);
 146
 147         ret = sdhci_add_host(host);
 148         if (ret)
 149                 goto err_sdhci_add;
 150
 151         /*
 152          * We must request the IRQ after sdhci_add_host(), as the tasklet only
 153          * gets setup in sdhci_add_host() and we oops.
 154          */
 155         if (gpio_is_valid(priv->gpio_cd)) {
 156                 ret = request_irq(gpio_to_irq(priv->gpio_cd),
 157                                   sdhci_dove_carddetect_irq,
 158                                   IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 159                                   mmc_hostname(host->mmc), host);
 160                 if (ret) {
 161                         dev_err(&pdev->dev, "card detect irq request failed: %d\n",
 162                                 ret);
 163                         goto err_request_irq;
 164                 }
 165         }
 166
 167         return 0;
 168
 169 err_request_irq:
 170         sdhci_remove_host(host, 0);
 171 err_sdhci_add:
 172         if (!IS_ERR(priv->clk))
 173                 clk_disable_unprepare(priv->clk);
 174         sdhci_pltfm_free(pdev);
 175 err_sdhci_pltfm_init:
 176         if (gpio_is_valid(priv->gpio_cd))
 177                 gpio_free(priv->gpio_cd);
 178         return ret;
 179 }
 180
 181 static int sdhci_dove_remove(struct platform_device *pdev)
 182 {
 183         struct sdhci_host *host = platform_get_drvdata(pdev);
 184         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 185         struct sdhci_dove_priv *priv = pltfm_host->priv;
 186
 187         sdhci_pltfm_unregister(pdev);
 188
 189         if (gpio_is_valid(priv->gpio_cd)) {
 190                 free_irq(gpio_to_irq(priv->gpio_cd), host);
 191                 gpio_free(priv->gpio_cd);
 192         }
 193
 194         if (!IS_ERR(priv->clk))
 195                 clk_disable_unprepare(priv->clk);
 196
 197         return 0;
 198 }
 199
 200 static const struct of_device_id sdhci_dove_of_match_table[] = {
 201         { .compatible = "marvell,dove-sdhci", },
 202         {}
 203 };
 204 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
 205
 206 static struct platform_driver sdhci_dove_driver = {
 207         .driver         = {
 208                 .name   = "sdhci-dove",
 209                 .owner  = THIS_MODULE,
 210                 .pm     = SDHCI_PLTFM_PMOPS,
 211                 .of_match_table = of_match_ptr(sdhci_dove_of_match_table),
 212         },
 213         .probe          = sdhci_dove_probe,
 214         .remove         = sdhci_dove_remove,
 215 };
 216
 217 module_platform_driver(sdhci_dove_driver);
 218
 219 MODULE_DESCRIPTION("SDHCI driver for Dove");
 220 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
 221               "Mike Rapoport <mike@compulab.co.il>");
 222 MODULE_LICENSE("GPL v2");