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Linux/drivers/mmc/host/sdhci-pltfm.c

  1 /*
  2  * sdhci-pltfm.c Support for SDHCI platform devices
  3  * Copyright (c) 2009 Intel Corporation
  4  *
  5  * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.
  6  * Copyright (c) 2009 MontaVista Software, Inc.
  7  *
  8  * Authors: Xiaobo Xie <X.Xie@freescale.com>
  9  *          Anton Vorontsov <avorontsov@ru.mvista.com>
 10  *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License version 2 as
 13  * published by the Free Software Foundation.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  * GNU General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, write to the Free Software
 22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 23  */
 24 
 25 /* Supports:
 26  * SDHCI platform devices
 27  *
 28  * Inspired by sdhci-pci.c, by Pierre Ossman
 29  */
 30 
 31 #include <linux/err.h>
 32 #include <linux/module.h>
 33 #include <linux/of.h>
 34 #ifdef CONFIG_PPC
 35 #include <asm/machdep.h>
 36 #endif
 37 #include "sdhci-pltfm.h"
 38 
 39 unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host)
 40 {
 41         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 42 
 43         return clk_get_rate(pltfm_host->clk);
 44 }
 45 EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock);
 46 
 47 static const struct sdhci_ops sdhci_pltfm_ops = {
 48         .set_clock = sdhci_set_clock,
 49         .set_bus_width = sdhci_set_bus_width,
 50         .reset = sdhci_reset,
 51         .set_uhs_signaling = sdhci_set_uhs_signaling,
 52 };
 53 
 54 #ifdef CONFIG_OF
 55 static bool sdhci_of_wp_inverted(struct device_node *np)
 56 {
 57         if (of_get_property(np, "sdhci,wp-inverted", NULL) ||
 58             of_get_property(np, "wp-inverted", NULL))
 59                 return true;
 60 
 61         /* Old device trees don't have the wp-inverted property. */
 62 #ifdef CONFIG_PPC
 63         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
 64 #else
 65         return false;
 66 #endif /* CONFIG_PPC */
 67 }
 68 
 69 void sdhci_get_of_property(struct platform_device *pdev)
 70 {
 71         struct device_node *np = pdev->dev.of_node;
 72         struct sdhci_host *host = platform_get_drvdata(pdev);
 73         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 74         u32 bus_width;
 75 
 76         if (of_get_property(np, "sdhci,auto-cmd12", NULL))
 77                 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
 78 
 79         if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
 80             (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
 81             bus_width == 1))
 82                 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
 83 
 84         if (sdhci_of_wp_inverted(np))
 85                 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
 86 
 87         if (of_get_property(np, "broken-cd", NULL))
 88                 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
 89 
 90         if (of_get_property(np, "no-1-8-v", NULL))
 91                 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
 92 
 93         if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
 94                 host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
 95 
 96         if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
 97             of_device_is_compatible(np, "fsl,p1010-esdhc") ||
 98             of_device_is_compatible(np, "fsl,t4240-esdhc") ||
 99             of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
100                 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
101 
102         of_property_read_u32(np, "clock-frequency", &pltfm_host->clock);
103 
104         if (of_find_property(np, "keep-power-in-suspend", NULL))
105                 host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
106 
107         if (of_property_read_bool(np, "wakeup-source") ||
108             of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */
109                 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
110 }
111 #else
112 void sdhci_get_of_property(struct platform_device *pdev) {}
113 #endif /* CONFIG_OF */
114 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
115 
116 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
117                                     const struct sdhci_pltfm_data *pdata,
118                                     size_t priv_size)
119 {
120         struct sdhci_host *host;
121         struct resource *iomem;
122         void __iomem *ioaddr;
123         int irq, ret;
124 
125         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
126         ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
127         if (IS_ERR(ioaddr)) {
128                 ret = PTR_ERR(ioaddr);
129                 goto err;
130         }
131 
132         irq = platform_get_irq(pdev, 0);
133         if (irq < 0) {
134                 dev_err(&pdev->dev, "failed to get IRQ number\n");
135                 ret = irq;
136                 goto err;
137         }
138 
139         host = sdhci_alloc_host(&pdev->dev,
140                 sizeof(struct sdhci_pltfm_host) + priv_size);
141 
142         if (IS_ERR(host)) {
143                 ret = PTR_ERR(host);
144                 goto err;
145         }
146 
147         host->ioaddr = ioaddr;
148         host->irq = irq;
149         host->hw_name = dev_name(&pdev->dev);
150         if (pdata && pdata->ops)
151                 host->ops = pdata->ops;
152         else
153                 host->ops = &sdhci_pltfm_ops;
154         if (pdata) {
155                 host->quirks = pdata->quirks;
156                 host->quirks2 = pdata->quirks2;
157         }
158 
159         /*
160          * Some platforms need to probe the controller to be able to
161          * determine which caps should be used.
162          */
163         if (host->ops && host->ops->platform_init)
164                 host->ops->platform_init(host);
165 
166         platform_set_drvdata(pdev, host);
167 
168         return host;
169 err:
170         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
171         return ERR_PTR(ret);
172 }
173 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
174 
175 void sdhci_pltfm_free(struct platform_device *pdev)
176 {
177         struct sdhci_host *host = platform_get_drvdata(pdev);
178 
179         sdhci_free_host(host);
180 }
181 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
182 
183 int sdhci_pltfm_register(struct platform_device *pdev,
184                         const struct sdhci_pltfm_data *pdata,
185                         size_t priv_size)
186 {
187         struct sdhci_host *host;
188         int ret = 0;
189 
190         host = sdhci_pltfm_init(pdev, pdata, priv_size);
191         if (IS_ERR(host))
192                 return PTR_ERR(host);
193 
194         sdhci_get_of_property(pdev);
195 
196         ret = sdhci_add_host(host);
197         if (ret)
198                 sdhci_pltfm_free(pdev);
199 
200         return ret;
201 }
202 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
203 
204 int sdhci_pltfm_unregister(struct platform_device *pdev)
205 {
206         struct sdhci_host *host = platform_get_drvdata(pdev);
207         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
208         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
209 
210         sdhci_remove_host(host, dead);
211         clk_disable_unprepare(pltfm_host->clk);
212         sdhci_pltfm_free(pdev);
213 
214         return 0;
215 }
216 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
217 
218 #ifdef CONFIG_PM
219 int sdhci_pltfm_suspend(struct device *dev)
220 {
221         struct sdhci_host *host = dev_get_drvdata(dev);
222 
223         return sdhci_suspend_host(host);
224 }
225 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
226 
227 int sdhci_pltfm_resume(struct device *dev)
228 {
229         struct sdhci_host *host = dev_get_drvdata(dev);
230 
231         return sdhci_resume_host(host);
232 }
233 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
234 
235 const struct dev_pm_ops sdhci_pltfm_pmops = {
236         .suspend        = sdhci_pltfm_suspend,
237         .resume         = sdhci_pltfm_resume,
238 };
239 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
240 #endif  /* CONFIG_PM */
241 
242 static int __init sdhci_pltfm_drv_init(void)
243 {
244         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
245 
246         return 0;
247 }
248 module_init(sdhci_pltfm_drv_init);
249 
250 static void __exit sdhci_pltfm_drv_exit(void)
251 {
252 }
253 module_exit(sdhci_pltfm_drv_exit);
254 
255 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
256 MODULE_AUTHOR("Intel Corporation");
257 MODULE_LICENSE("GPL v2");
258 

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