drivers/mmc/host/sdhci-spear.c

   1 /*
   2  * drivers/mmc/host/sdhci-spear.c
   3  *
   4  * Support of SDHCI platform devices for spear soc family
   5  *
   6  * Copyright (C) 2010 ST Microelectronics
   7  * Viresh Kumar<viresh.kumar@st.com>
   8  *
   9  * Inspired by sdhci-pltfm.c
  10  *
  11  * This file is licensed under the terms of the GNU General Public
  12  * License version 2. This program is licensed "as is" without any
  13  * warranty of any kind, whether express or implied.
  14  */
  15
  16 #include <linux/clk.h>
  17 #include <linux/delay.h>
  18 #include <linux/gpio.h>
  19 #include <linux/highmem.h>
  20 #include <linux/module.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/irq.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/pm.h>
  25 #include <linux/slab.h>
  26 #include <linux/mmc/host.h>
  27 #include <linux/mmc/sdhci-spear.h>
  28 #include <linux/io.h>
  29 #include "sdhci.h"
  30
  31 struct spear_sdhci {
  32         struct clk *clk;
  33         struct sdhci_plat_data *data;
  34 };
  35
  36 /* sdhci ops */
  37 static struct sdhci_ops sdhci_pltfm_ops = {
  38         /* Nothing to do for now. */
  39 };
  40
  41 /* gpio card detection interrupt handler */
  42 static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
  43 {
  44         struct platform_device *pdev = dev_id;
  45         struct sdhci_host *host = platform_get_drvdata(pdev);
  46         struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
  47         unsigned long gpio_irq_type;
  48         int val;
  49
  50         val = gpio_get_value(sdhci->data->card_int_gpio);
  51
  52         /* val == 1 -> card removed, val == 0 -> card inserted */
  53         /* if card removed - set irq for low level, else vice versa */
  54         gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
  55         irq_set_irq_type(irq, gpio_irq_type);
  56
  57         if (sdhci->data->card_power_gpio >= 0) {
  58                 if (!sdhci->data->power_always_enb) {
  59                         /* if card inserted, give power, otherwise remove it */
  60                         val = sdhci->data->power_active_high ? !val : val ;
  61                         gpio_set_value(sdhci->data->card_power_gpio, val);
  62                 }
  63         }
  64
  65         /* inform sdhci driver about card insertion/removal */
  66         tasklet_schedule(&host->card_tasklet);
  67
  68         return IRQ_HANDLED;
  69 }
  70
  71 static int __devinit sdhci_probe(struct platform_device *pdev)
  72 {
  73         struct sdhci_host *host;
  74         struct resource *iomem;
  75         struct spear_sdhci *sdhci;
  76         int ret;
  77
  78         BUG_ON(pdev == NULL);
  79
  80         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  81         if (!iomem) {
  82                 ret = -ENOMEM;
  83                 dev_dbg(&pdev->dev, "memory resource not defined\n");
  84                 goto err;
  85         }
  86
  87         if (!request_mem_region(iomem->start, resource_size(iomem),
  88                                 "spear-sdhci")) {
  89                 ret = -EBUSY;
  90                 dev_dbg(&pdev->dev, "cannot request region\n");
  91                 goto err;
  92         }
  93
  94         sdhci = kzalloc(sizeof(*sdhci), GFP_KERNEL);
  95         if (!sdhci) {
  96                 ret = -ENOMEM;
  97                 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
  98                 goto err_kzalloc;
  99         }
 100
 101         /* clk enable */
 102         sdhci->clk = clk_get(&pdev->dev, NULL);
 103         if (IS_ERR(sdhci->clk)) {
 104                 ret = PTR_ERR(sdhci->clk);
 105                 dev_dbg(&pdev->dev, "Error getting clock\n");
 106                 goto err_clk_get;
 107         }
 108
 109         ret = clk_enable(sdhci->clk);
 110         if (ret) {
 111                 dev_dbg(&pdev->dev, "Error enabling clock\n");
 112                 goto err_clk_enb;
 113         }
 114
 115         /* overwrite platform_data */
 116         sdhci->data = dev_get_platdata(&pdev->dev);
 117         pdev->dev.platform_data = sdhci;
 118
 119         if (pdev->dev.parent)
 120                 host = sdhci_alloc_host(pdev->dev.parent, 0);
 121         else
 122                 host = sdhci_alloc_host(&pdev->dev, 0);
 123
 124         if (IS_ERR(host)) {
 125                 ret = PTR_ERR(host);
 126                 dev_dbg(&pdev->dev, "error allocating host\n");
 127                 goto err_alloc_host;
 128         }
 129
 130         host->hw_name = "sdhci";
 131         host->ops = &sdhci_pltfm_ops;
 132         host->irq = platform_get_irq(pdev, 0);
 133         host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
 134
 135         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 136         if (!host->ioaddr) {
 137                 ret = -ENOMEM;
 138                 dev_dbg(&pdev->dev, "failed to remap registers\n");
 139                 goto err_ioremap;
 140         }
 141
 142         ret = sdhci_add_host(host);
 143         if (ret) {
 144                 dev_dbg(&pdev->dev, "error adding host\n");
 145                 goto err_add_host;
 146         }
 147
 148         platform_set_drvdata(pdev, host);
 149
 150         /*
 151          * It is optional to use GPIOs for sdhci Power control & sdhci card
 152          * interrupt detection. If sdhci->data is NULL, then use original sdhci
 153          * lines otherwise GPIO lines.
 154          * If GPIO is selected for power control, then power should be disabled
 155          * after card removal and should be enabled when card insertion
 156          * interrupt occurs
 157          */
 158         if (!sdhci->data)
 159                 return 0;
 160
 161         if (sdhci->data->card_power_gpio >= 0) {
 162                 int val = 0;
 163
 164                 ret = gpio_request(sdhci->data->card_power_gpio, "sdhci");
 165                 if (ret < 0) {
 166                         dev_dbg(&pdev->dev, "gpio request fail: %d\n",
 167                                         sdhci->data->card_power_gpio);
 168                         goto err_pgpio_request;
 169                 }
 170
 171                 if (sdhci->data->power_always_enb)
 172                         val = sdhci->data->power_active_high;
 173                 else
 174                         val = !sdhci->data->power_active_high;
 175
 176                 ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
 177                 if (ret) {
 178                         dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
 179                                         sdhci->data->card_power_gpio);
 180                         goto err_pgpio_direction;
 181                 }
 182         }
 183
 184         if (sdhci->data->card_int_gpio >= 0) {
 185                 ret = gpio_request(sdhci->data->card_int_gpio, "sdhci");
 186                 if (ret < 0) {
 187                         dev_dbg(&pdev->dev, "gpio request fail: %d\n",
 188                                         sdhci->data->card_int_gpio);
 189                         goto err_igpio_request;
 190                 }
 191
 192                 ret = gpio_direction_input(sdhci->data->card_int_gpio);
 193                 if (ret) {
 194                         dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
 195                                         sdhci->data->card_int_gpio);
 196                         goto err_igpio_direction;
 197                 }
 198                 ret = request_irq(gpio_to_irq(sdhci->data->card_int_gpio),
 199                                 sdhci_gpio_irq, IRQF_TRIGGER_LOW,
 200                                 mmc_hostname(host->mmc), pdev);
 201                 if (ret) {
 202                         dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
 203                                         sdhci->data->card_int_gpio);
 204                         goto err_igpio_request_irq;
 205                 }
 206
 207         }
 208
 209         return 0;
 210
 211 err_igpio_request_irq:
 212 err_igpio_direction:
 213         if (sdhci->data->card_int_gpio >= 0)
 214                 gpio_free(sdhci->data->card_int_gpio);
 215 err_igpio_request:
 216 err_pgpio_direction:
 217         if (sdhci->data->card_power_gpio >= 0)
 218                 gpio_free(sdhci->data->card_power_gpio);
 219 err_pgpio_request:
 220         platform_set_drvdata(pdev, NULL);
 221         sdhci_remove_host(host, 1);
 222 err_add_host:
 223         iounmap(host->ioaddr);
 224 err_ioremap:
 225         sdhci_free_host(host);
 226 err_alloc_host:
 227         clk_disable(sdhci->clk);
 228 err_clk_enb:
 229         clk_put(sdhci->clk);
 230 err_clk_get:
 231         kfree(sdhci);
 232 err_kzalloc:
 233         release_mem_region(iomem->start, resource_size(iomem));
 234 err:
 235         dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
 236         return ret;
 237 }
 238
 239 static int __devexit sdhci_remove(struct platform_device *pdev)
 240 {
 241         struct sdhci_host *host = platform_get_drvdata(pdev);
 242         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 243         struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
 244         int dead;
 245         u32 scratch;
 246
 247         if (sdhci->data) {
 248                 if (sdhci->data->card_int_gpio >= 0) {
 249                         free_irq(gpio_to_irq(sdhci->data->card_int_gpio), pdev);
 250                         gpio_free(sdhci->data->card_int_gpio);
 251                 }
 252
 253                 if (sdhci->data->card_power_gpio >= 0)
 254                         gpio_free(sdhci->data->card_power_gpio);
 255         }
 256
 257         platform_set_drvdata(pdev, NULL);
 258         dead = 0;
 259         scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
 260         if (scratch == (u32)-1)
 261                 dead = 1;
 262
 263         sdhci_remove_host(host, dead);
 264         iounmap(host->ioaddr);
 265         sdhci_free_host(host);
 266         clk_disable(sdhci->clk);
 267         clk_put(sdhci->clk);
 268         kfree(sdhci);
 269         if (iomem)
 270                 release_mem_region(iomem->start, resource_size(iomem));
 271
 272         return 0;
 273 }
 274
 275 #ifdef CONFIG_PM
 276 static int sdhci_suspend(struct device *dev)
 277 {
 278         struct sdhci_host *host = dev_get_drvdata(dev);
 279         struct spear_sdhci *sdhci = dev_get_platdata(dev);
 280         int ret;
 281
 282         ret = sdhci_suspend_host(host);
 283         if (!ret)
 284                 clk_disable(sdhci->clk);
 285
 286         return ret;
 287 }
 288
 289 static int sdhci_resume(struct device *dev)
 290 {
 291         struct sdhci_host *host = dev_get_drvdata(dev);
 292         struct spear_sdhci *sdhci = dev_get_platdata(dev);
 293         int ret;
 294
 295         ret = clk_enable(sdhci->clk);
 296         if (ret) {
 297                 dev_dbg(dev, "Resume: Error enabling clock\n");
 298                 return ret;
 299         }
 300
 301         return sdhci_resume_host(host);
 302 }
 303
 304 const struct dev_pm_ops sdhci_pm_ops = {
 305         .suspend        = sdhci_suspend,
 306         .resume         = sdhci_resume,
 307 };
 308 #endif
 309
 310 static struct platform_driver sdhci_driver = {
 311         .driver = {
 312                 .name   = "sdhci",
 313                 .owner  = THIS_MODULE,
 314 #ifdef CONFIG_PM
 315                 .pm     = &sdhci_pm_ops,
 316 #endif
 317         },
 318         .probe          = sdhci_probe,
 319         .remove         = __devexit_p(sdhci_remove),
 320 };
 321
 322 module_platform_driver(sdhci_driver);
 323
 324 MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
 325 MODULE_AUTHOR("Viresh Kumar <viresh.kumar@st.com>");
 326 MODULE_LICENSE("GPL v2");