Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

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         const __be32 *clk;
 75         u32 bus_width;
 76         int size;
 77 
 78         if (of_get_property(np, "sdhci,auto-cmd12", NULL))
 79                 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
 80 
 81         if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
 82             (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
 83             bus_width == 1))
 84                 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
 85 
 86         if (sdhci_of_wp_inverted(np))
 87                 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
 88 
 89         if (of_get_property(np, "broken-cd", NULL))
 90                 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
 91 
 92         if (of_get_property(np, "no-1-8-v", NULL))
 93                 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
 94 
 95         if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
 96                 host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
 97 
 98         if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
 99             of_device_is_compatible(np, "fsl,p1010-esdhc") ||
100             of_device_is_compatible(np, "fsl,t4240-esdhc") ||
101             of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
102                 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
103 
104         clk = of_get_property(np, "clock-frequency", &size);
105         if (clk && size == sizeof(*clk) && *clk)
106                 pltfm_host->clock = be32_to_cpup(clk);
107 
108         if (of_find_property(np, "keep-power-in-suspend", NULL))
109                 host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
110 
111         if (of_find_property(np, "enable-sdio-wakeup", NULL))
112                 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
113 }
114 #else
115 void sdhci_get_of_property(struct platform_device *pdev) {}
116 #endif /* CONFIG_OF */
117 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
118 
119 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
120                                     const struct sdhci_pltfm_data *pdata,
121                                     size_t priv_size)
122 {
123         struct sdhci_host *host;
124         struct resource *iomem;
125         int ret;
126 
127         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
128         if (!iomem) {
129                 ret = -ENOMEM;
130                 goto err;
131         }
132 
133         if (resource_size(iomem) < 0x100)
134                 dev_err(&pdev->dev, "Invalid iomem size!\n");
135 
136         host = sdhci_alloc_host(&pdev->dev,
137                 sizeof(struct sdhci_pltfm_host) + priv_size);
138 
139         if (IS_ERR(host)) {
140                 ret = PTR_ERR(host);
141                 goto err;
142         }
143 
144         host->hw_name = dev_name(&pdev->dev);
145         if (pdata && pdata->ops)
146                 host->ops = pdata->ops;
147         else
148                 host->ops = &sdhci_pltfm_ops;
149         if (pdata) {
150                 host->quirks = pdata->quirks;
151                 host->quirks2 = pdata->quirks2;
152         }
153 
154         host->irq = platform_get_irq(pdev, 0);
155 
156         if (!request_mem_region(iomem->start, resource_size(iomem),
157                 mmc_hostname(host->mmc))) {
158                 dev_err(&pdev->dev, "cannot request region\n");
159                 ret = -EBUSY;
160                 goto err_request;
161         }
162 
163         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
164         if (!host->ioaddr) {
165                 dev_err(&pdev->dev, "failed to remap registers\n");
166                 ret = -ENOMEM;
167                 goto err_remap;
168         }
169 
170         /*
171          * Some platforms need to probe the controller to be able to
172          * determine which caps should be used.
173          */
174         if (host->ops && host->ops->platform_init)
175                 host->ops->platform_init(host);
176 
177         platform_set_drvdata(pdev, host);
178 
179         return host;
180 
181 err_remap:
182         release_mem_region(iomem->start, resource_size(iomem));
183 err_request:
184         sdhci_free_host(host);
185 err:
186         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
187         return ERR_PTR(ret);
188 }
189 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
190 
191 void sdhci_pltfm_free(struct platform_device *pdev)
192 {
193         struct sdhci_host *host = platform_get_drvdata(pdev);
194         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
195 
196         iounmap(host->ioaddr);
197         release_mem_region(iomem->start, resource_size(iomem));
198         sdhci_free_host(host);
199 }
200 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
201 
202 int sdhci_pltfm_register(struct platform_device *pdev,
203                         const struct sdhci_pltfm_data *pdata,
204                         size_t priv_size)
205 {
206         struct sdhci_host *host;
207         int ret = 0;
208 
209         host = sdhci_pltfm_init(pdev, pdata, priv_size);
210         if (IS_ERR(host))
211                 return PTR_ERR(host);
212 
213         sdhci_get_of_property(pdev);
214 
215         ret = sdhci_add_host(host);
216         if (ret)
217                 sdhci_pltfm_free(pdev);
218 
219         return ret;
220 }
221 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
222 
223 int sdhci_pltfm_unregister(struct platform_device *pdev)
224 {
225         struct sdhci_host *host = platform_get_drvdata(pdev);
226         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
227         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
228 
229         sdhci_remove_host(host, dead);
230         clk_disable_unprepare(pltfm_host->clk);
231         sdhci_pltfm_free(pdev);
232 
233         return 0;
234 }
235 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
236 
237 #ifdef CONFIG_PM
238 int sdhci_pltfm_suspend(struct device *dev)
239 {
240         struct sdhci_host *host = dev_get_drvdata(dev);
241 
242         return sdhci_suspend_host(host);
243 }
244 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
245 
246 int sdhci_pltfm_resume(struct device *dev)
247 {
248         struct sdhci_host *host = dev_get_drvdata(dev);
249 
250         return sdhci_resume_host(host);
251 }
252 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
253 
254 const struct dev_pm_ops sdhci_pltfm_pmops = {
255         .suspend        = sdhci_pltfm_suspend,
256         .resume         = sdhci_pltfm_resume,
257 };
258 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
259 #endif  /* CONFIG_PM */
260 
261 static int __init sdhci_pltfm_drv_init(void)
262 {
263         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
264 
265         return 0;
266 }
267 module_init(sdhci_pltfm_drv_init);
268 
269 static void __exit sdhci_pltfm_drv_exit(void)
270 {
271 }
272 module_exit(sdhci_pltfm_drv_exit);
273 
274 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
275 MODULE_AUTHOR("Intel Corporation");
276 MODULE_LICENSE("GPL v2");
277 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us