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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         .set_clock = sdhci_set_clock,
 42         .set_bus_width = sdhci_set_bus_width,
 43         .reset = sdhci_reset,
 44         .set_uhs_signaling = sdhci_set_uhs_signaling,
 45 };
 46 
 47 #ifdef CONFIG_OF
 48 static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
 49 {
 50         struct device_node *np = pdev->dev.of_node;
 51         struct sdhci_plat_data *pdata = NULL;
 52         int cd_gpio;
 53 
 54         cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
 55         if (!gpio_is_valid(cd_gpio))
 56                 cd_gpio = -1;
 57 
 58         /* If pdata is required */
 59         if (cd_gpio != -1) {
 60                 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 61                 if (!pdata)
 62                         dev_err(&pdev->dev, "DT: kzalloc failed\n");
 63                 else
 64                         pdata->card_int_gpio = cd_gpio;
 65         }
 66 
 67         return pdata;
 68 }
 69 #else
 70 static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
 71 {
 72         return ERR_PTR(-ENOSYS);
 73 }
 74 #endif
 75 
 76 static int sdhci_probe(struct platform_device *pdev)
 77 {
 78         struct device_node *np = pdev->dev.of_node;
 79         struct sdhci_host *host;
 80         struct resource *iomem;
 81         struct spear_sdhci *sdhci;
 82         struct device *dev;
 83         int ret;
 84 
 85         dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
 86         host = sdhci_alloc_host(dev, sizeof(*sdhci));
 87         if (IS_ERR(host)) {
 88                 ret = PTR_ERR(host);
 89                 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
 90                 goto err;
 91         }
 92 
 93         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 94         host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
 95         if (IS_ERR(host->ioaddr)) {
 96                 ret = PTR_ERR(host->ioaddr);
 97                 dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
 98                 goto err_host;
 99         }
100 
101         host->hw_name = "sdhci";
102         host->ops = &sdhci_pltfm_ops;
103         host->irq = platform_get_irq(pdev, 0);
104         host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
105 
106         sdhci = sdhci_priv(host);
107 
108         /* clk enable */
109         sdhci->clk = devm_clk_get(&pdev->dev, NULL);
110         if (IS_ERR(sdhci->clk)) {
111                 ret = PTR_ERR(sdhci->clk);
112                 dev_dbg(&pdev->dev, "Error getting clock\n");
113                 goto err_host;
114         }
115 
116         ret = clk_prepare_enable(sdhci->clk);
117         if (ret) {
118                 dev_dbg(&pdev->dev, "Error enabling clock\n");
119                 goto err_host;
120         }
121 
122         ret = clk_set_rate(sdhci->clk, 50000000);
123         if (ret)
124                 dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
125                                 clk_get_rate(sdhci->clk));
126 
127         if (np) {
128                 sdhci->data = sdhci_probe_config_dt(pdev);
129                 if (IS_ERR(sdhci->data)) {
130                         dev_err(&pdev->dev, "DT: Failed to get pdata\n");
131                         goto disable_clk;
132                 }
133         } else {
134                 sdhci->data = dev_get_platdata(&pdev->dev);
135         }
136 
137         /*
138          * It is optional to use GPIOs for sdhci card detection. If
139          * sdhci->data is NULL, then use original sdhci lines otherwise
140          * GPIO lines. We use the built-in GPIO support for this.
141          */
142         if (sdhci->data && sdhci->data->card_int_gpio >= 0) {
143                 ret = mmc_gpio_request_cd(host->mmc,
144                                           sdhci->data->card_int_gpio, 0);
145                 if (ret < 0) {
146                         dev_dbg(&pdev->dev,
147                                 "failed to request card-detect gpio%d\n",
148                                 sdhci->data->card_int_gpio);
149                         goto disable_clk;
150                 }
151         }
152 
153         ret = sdhci_add_host(host);
154         if (ret) {
155                 dev_dbg(&pdev->dev, "error adding host\n");
156                 goto disable_clk;
157         }
158 
159         platform_set_drvdata(pdev, host);
160 
161         return 0;
162 
163 disable_clk:
164         clk_disable_unprepare(sdhci->clk);
165 err_host:
166         sdhci_free_host(host);
167 err:
168         dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
169         return ret;
170 }
171 
172 static int sdhci_remove(struct platform_device *pdev)
173 {
174         struct sdhci_host *host = platform_get_drvdata(pdev);
175         struct spear_sdhci *sdhci = sdhci_priv(host);
176         int dead = 0;
177         u32 scratch;
178 
179         scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
180         if (scratch == (u32)-1)
181                 dead = 1;
182 
183         sdhci_remove_host(host, dead);
184         clk_disable_unprepare(sdhci->clk);
185         sdhci_free_host(host);
186 
187         return 0;
188 }
189 
190 #ifdef CONFIG_PM_SLEEP
191 static int sdhci_suspend(struct device *dev)
192 {
193         struct sdhci_host *host = dev_get_drvdata(dev);
194         struct spear_sdhci *sdhci = sdhci_priv(host);
195         int ret;
196 
197         ret = sdhci_suspend_host(host);
198         if (!ret)
199                 clk_disable(sdhci->clk);
200 
201         return ret;
202 }
203 
204 static int sdhci_resume(struct device *dev)
205 {
206         struct sdhci_host *host = dev_get_drvdata(dev);
207         struct spear_sdhci *sdhci = sdhci_priv(host);
208         int ret;
209 
210         ret = clk_enable(sdhci->clk);
211         if (ret) {
212                 dev_dbg(dev, "Resume: Error enabling clock\n");
213                 return ret;
214         }
215 
216         return sdhci_resume_host(host);
217 }
218 #endif
219 
220 static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
221 
222 #ifdef CONFIG_OF
223 static const struct of_device_id sdhci_spear_id_table[] = {
224         { .compatible = "st,spear300-sdhci" },
225         {}
226 };
227 MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
228 #endif
229 
230 static struct platform_driver sdhci_driver = {
231         .driver = {
232                 .name   = "sdhci",
233                 .owner  = THIS_MODULE,
234                 .pm     = &sdhci_pm_ops,
235                 .of_match_table = of_match_ptr(sdhci_spear_id_table),
236         },
237         .probe          = sdhci_probe,
238         .remove         = sdhci_remove,
239 };
240 
241 module_platform_driver(sdhci_driver);
242 
243 MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
244 MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
245 MODULE_LICENSE("GPL v2");
246 

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