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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/slot-gpio.h>
 30 #include <linux/io.h>
 31 #include "sdhci.h"
 32 
 33 struct spear_sdhci {
 34         struct clk *clk;
 35         int card_int_gpio;
 36 };
 37 
 38 /* sdhci ops */
 39 static const struct sdhci_ops sdhci_pltfm_ops = {
 40         .set_clock = sdhci_set_clock,
 41         .set_bus_width = sdhci_set_bus_width,
 42         .reset = sdhci_reset,
 43         .set_uhs_signaling = sdhci_set_uhs_signaling,
 44 };
 45 
 46 static void sdhci_probe_config_dt(struct device_node *np,
 47                                 struct spear_sdhci *host)
 48 {
 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         host->card_int_gpio = cd_gpio;
 56 }
 57 
 58 static int sdhci_probe(struct platform_device *pdev)
 59 {
 60         struct sdhci_host *host;
 61         struct resource *iomem;
 62         struct spear_sdhci *sdhci;
 63         struct device *dev;
 64         int ret;
 65 
 66         dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
 67         host = sdhci_alloc_host(dev, sizeof(*sdhci));
 68         if (IS_ERR(host)) {
 69                 ret = PTR_ERR(host);
 70                 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
 71                 goto err;
 72         }
 73 
 74         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 75         host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
 76         if (IS_ERR(host->ioaddr)) {
 77                 ret = PTR_ERR(host->ioaddr);
 78                 dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
 79                 goto err_host;
 80         }
 81 
 82         host->hw_name = "sdhci";
 83         host->ops = &sdhci_pltfm_ops;
 84         host->irq = platform_get_irq(pdev, 0);
 85         host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
 86 
 87         sdhci = sdhci_priv(host);
 88 
 89         /* clk enable */
 90         sdhci->clk = devm_clk_get(&pdev->dev, NULL);
 91         if (IS_ERR(sdhci->clk)) {
 92                 ret = PTR_ERR(sdhci->clk);
 93                 dev_dbg(&pdev->dev, "Error getting clock\n");
 94                 goto err_host;
 95         }
 96 
 97         ret = clk_prepare_enable(sdhci->clk);
 98         if (ret) {
 99                 dev_dbg(&pdev->dev, "Error enabling clock\n");
100                 goto err_host;
101         }
102 
103         ret = clk_set_rate(sdhci->clk, 50000000);
104         if (ret)
105                 dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
106                                 clk_get_rate(sdhci->clk));
107 
108         sdhci_probe_config_dt(pdev->dev.of_node, sdhci);
109         /*
110          * It is optional to use GPIOs for sdhci card detection. If
111          * sdhci->card_int_gpio < 0, then use original sdhci lines otherwise
112          * GPIO lines. We use the built-in GPIO support for this.
113          */
114         if (sdhci->card_int_gpio >= 0) {
115                 ret = mmc_gpio_request_cd(host->mmc, sdhci->card_int_gpio, 0);
116                 if (ret < 0) {
117                         dev_dbg(&pdev->dev,
118                                 "failed to request card-detect gpio%d\n",
119                                 sdhci->card_int_gpio);
120                         goto disable_clk;
121                 }
122         }
123 
124         ret = sdhci_add_host(host);
125         if (ret) {
126                 dev_dbg(&pdev->dev, "error adding host\n");
127                 goto disable_clk;
128         }
129 
130         platform_set_drvdata(pdev, host);
131 
132         return 0;
133 
134 disable_clk:
135         clk_disable_unprepare(sdhci->clk);
136 err_host:
137         sdhci_free_host(host);
138 err:
139         dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
140         return ret;
141 }
142 
143 static int sdhci_remove(struct platform_device *pdev)
144 {
145         struct sdhci_host *host = platform_get_drvdata(pdev);
146         struct spear_sdhci *sdhci = sdhci_priv(host);
147         int dead = 0;
148         u32 scratch;
149 
150         scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
151         if (scratch == (u32)-1)
152                 dead = 1;
153 
154         sdhci_remove_host(host, dead);
155         clk_disable_unprepare(sdhci->clk);
156         sdhci_free_host(host);
157 
158         return 0;
159 }
160 
161 #ifdef CONFIG_PM_SLEEP
162 static int sdhci_suspend(struct device *dev)
163 {
164         struct sdhci_host *host = dev_get_drvdata(dev);
165         struct spear_sdhci *sdhci = sdhci_priv(host);
166         int ret;
167 
168         ret = sdhci_suspend_host(host);
169         if (!ret)
170                 clk_disable(sdhci->clk);
171 
172         return ret;
173 }
174 
175 static int sdhci_resume(struct device *dev)
176 {
177         struct sdhci_host *host = dev_get_drvdata(dev);
178         struct spear_sdhci *sdhci = sdhci_priv(host);
179         int ret;
180 
181         ret = clk_enable(sdhci->clk);
182         if (ret) {
183                 dev_dbg(dev, "Resume: Error enabling clock\n");
184                 return ret;
185         }
186 
187         return sdhci_resume_host(host);
188 }
189 #endif
190 
191 static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
192 
193 #ifdef CONFIG_OF
194 static const struct of_device_id sdhci_spear_id_table[] = {
195         { .compatible = "st,spear300-sdhci" },
196         {}
197 };
198 MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
199 #endif
200 
201 static struct platform_driver sdhci_driver = {
202         .driver = {
203                 .name   = "sdhci",
204                 .pm     = &sdhci_pm_ops,
205                 .of_match_table = of_match_ptr(sdhci_spear_id_table),
206         },
207         .probe          = sdhci_probe,
208         .remove         = sdhci_remove,
209 };
210 
211 module_platform_driver(sdhci_driver);
212 
213 MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
214 MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
215 MODULE_LICENSE("GPL v2");
216 

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