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Linux/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.linux@gmail.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/of.h>
 24 #include <linux/of_gpio.h>
 25 #include <linux/platform_device.h>
 26 #include <linux/pm.h>
 27 #include <linux/slab.h>
 28 #include <linux/mmc/host.h>
 29 #include <linux/mmc/sdhci-spear.h>
 30 #include <linux/mmc/slot-gpio.h>
 31 #include <linux/io.h>
 32 #include "sdhci.h"
 33 
 34 struct spear_sdhci {
 35         struct clk *clk;
 36         struct sdhci_plat_data *data;
 37 };
 38 
 39 /* sdhci ops */
 40 static const struct sdhci_ops sdhci_pltfm_ops = {
 41         /* Nothing to do for now. */
 42 };
 43 
 44 #ifdef CONFIG_OF
 45 static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
 46 {
 47         struct device_node *np = pdev->dev.of_node;
 48         struct sdhci_plat_data *pdata = NULL;
 49         int cd_gpio;
 50 
 51         cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
 52         if (!gpio_is_valid(cd_gpio))
 53                 cd_gpio = -1;
 54 
 55         /* If pdata is required */
 56         if (cd_gpio != -1) {
 57                 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 58                 if (!pdata)
 59                         dev_err(&pdev->dev, "DT: kzalloc failed\n");
 60                 else
 61                         pdata->card_int_gpio = cd_gpio;
 62         }
 63 
 64         return pdata;
 65 }
 66 #else
 67 static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
 68 {
 69         return ERR_PTR(-ENOSYS);
 70 }
 71 #endif
 72 
 73 static int sdhci_probe(struct platform_device *pdev)
 74 {
 75         struct device_node *np = pdev->dev.of_node;
 76         struct sdhci_host *host;
 77         struct resource *iomem;
 78         struct spear_sdhci *sdhci;
 79         struct device *dev;
 80         int ret;
 81 
 82         dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
 83         host = sdhci_alloc_host(dev, sizeof(*sdhci));
 84         if (IS_ERR(host)) {
 85                 ret = PTR_ERR(host);
 86                 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
 87                 goto err;
 88         }
 89 
 90         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 91         host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
 92         if (IS_ERR(host->ioaddr)) {
 93                 ret = PTR_ERR(host->ioaddr);
 94                 dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
 95                 goto err_host;
 96         }
 97 
 98         host->hw_name = "sdhci";
 99         host->ops = &sdhci_pltfm_ops;
100         host->irq = platform_get_irq(pdev, 0);
101         host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
102 
103         sdhci = sdhci_priv(host);
104 
105         /* clk enable */
106         sdhci->clk = devm_clk_get(&pdev->dev, NULL);
107         if (IS_ERR(sdhci->clk)) {
108                 ret = PTR_ERR(sdhci->clk);
109                 dev_dbg(&pdev->dev, "Error getting clock\n");
110                 goto err_host;
111         }
112 
113         ret = clk_prepare_enable(sdhci->clk);
114         if (ret) {
115                 dev_dbg(&pdev->dev, "Error enabling clock\n");
116                 goto err_host;
117         }
118 
119         ret = clk_set_rate(sdhci->clk, 50000000);
120         if (ret)
121                 dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
122                                 clk_get_rate(sdhci->clk));
123 
124         if (np) {
125                 sdhci->data = sdhci_probe_config_dt(pdev);
126                 if (IS_ERR(sdhci->data)) {
127                         dev_err(&pdev->dev, "DT: Failed to get pdata\n");
128                         goto disable_clk;
129                 }
130         } else {
131                 sdhci->data = dev_get_platdata(&pdev->dev);
132         }
133 
134         /*
135          * It is optional to use GPIOs for sdhci card detection. If
136          * sdhci->data is NULL, then use original sdhci lines otherwise
137          * GPIO lines. We use the built-in GPIO support for this.
138          */
139         if (sdhci->data && sdhci->data->card_int_gpio >= 0) {
140                 ret = mmc_gpio_request_cd(host->mmc,
141                                           sdhci->data->card_int_gpio, 0);
142                 if (ret < 0) {
143                         dev_dbg(&pdev->dev,
144                                 "failed to request card-detect gpio%d\n",
145                                 sdhci->data->card_int_gpio);
146                         goto disable_clk;
147                 }
148         }
149 
150         ret = sdhci_add_host(host);
151         if (ret) {
152                 dev_dbg(&pdev->dev, "error adding host\n");
153                 goto disable_clk;
154         }
155 
156         platform_set_drvdata(pdev, host);
157 
158         return 0;
159 
160 disable_clk:
161         clk_disable_unprepare(sdhci->clk);
162 err_host:
163         sdhci_free_host(host);
164 err:
165         dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
166         return ret;
167 }
168 
169 static int sdhci_remove(struct platform_device *pdev)
170 {
171         struct sdhci_host *host = platform_get_drvdata(pdev);
172         struct spear_sdhci *sdhci = sdhci_priv(host);
173         int dead = 0;
174         u32 scratch;
175 
176         scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
177         if (scratch == (u32)-1)
178                 dead = 1;
179 
180         sdhci_remove_host(host, dead);
181         clk_disable_unprepare(sdhci->clk);
182         sdhci_free_host(host);
183 
184         return 0;
185 }
186 
187 #ifdef CONFIG_PM_SLEEP
188 static int sdhci_suspend(struct device *dev)
189 {
190         struct sdhci_host *host = dev_get_drvdata(dev);
191         struct spear_sdhci *sdhci = sdhci_priv(host);
192         int ret;
193 
194         ret = sdhci_suspend_host(host);
195         if (!ret)
196                 clk_disable(sdhci->clk);
197 
198         return ret;
199 }
200 
201 static int sdhci_resume(struct device *dev)
202 {
203         struct sdhci_host *host = dev_get_drvdata(dev);
204         struct spear_sdhci *sdhci = sdhci_priv(host);
205         int ret;
206 
207         ret = clk_enable(sdhci->clk);
208         if (ret) {
209                 dev_dbg(dev, "Resume: Error enabling clock\n");
210                 return ret;
211         }
212 
213         return sdhci_resume_host(host);
214 }
215 #endif
216 
217 static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
218 
219 #ifdef CONFIG_OF
220 static const struct of_device_id sdhci_spear_id_table[] = {
221         { .compatible = "st,spear300-sdhci" },
222         {}
223 };
224 MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
225 #endif
226 
227 static struct platform_driver sdhci_driver = {
228         .driver = {
229                 .name   = "sdhci",
230                 .owner  = THIS_MODULE,
231                 .pm     = &sdhci_pm_ops,
232                 .of_match_table = of_match_ptr(sdhci_spear_id_table),
233         },
234         .probe          = sdhci_probe,
235         .remove         = sdhci_remove,
236 };
237 
238 module_platform_driver(sdhci_driver);
239 
240 MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
241 MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
242 MODULE_LICENSE("GPL v2");
243 

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