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Linux/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 = 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");
223 

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