Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 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

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_device_is_available(np)) {
 79                 if (of_get_property(np, "sdhci,auto-cmd12", NULL))
 80                         host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
 81 
 82                 if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
 83                     (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
 84                     bus_width == 1))
 85                         host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
 86 
 87                 if (sdhci_of_wp_inverted(np))
 88                         host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
 89 
 90                 if (of_get_property(np, "broken-cd", NULL))
 91                         host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
 92 
 93                 if (of_get_property(np, "no-1-8-v", NULL))
 94                         host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
 95 
 96                 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
 97                         host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
 98 
 99                 if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
100                     of_device_is_compatible(np, "fsl,p1010-esdhc") ||
101                     of_device_is_compatible(np, "fsl,t4240-esdhc") ||
102                     of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
103                         host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
104 
105                 clk = of_get_property(np, "clock-frequency", &size);
106                 if (clk && size == sizeof(*clk) && *clk)
107                         pltfm_host->clock = be32_to_cpup(clk);
108 
109                 if (of_find_property(np, "keep-power-in-suspend", NULL))
110                         host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
111 
112                 if (of_find_property(np, "enable-sdio-wakeup", NULL))
113                         host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
114         }
115 }
116 #else
117 void sdhci_get_of_property(struct platform_device *pdev) {}
118 #endif /* CONFIG_OF */
119 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
120 
121 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
122                                     const struct sdhci_pltfm_data *pdata,
123                                     size_t priv_size)
124 {
125         struct sdhci_host *host;
126         struct resource *iomem;
127         int ret;
128 
129         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
130         if (!iomem) {
131                 ret = -ENOMEM;
132                 goto err;
133         }
134 
135         if (resource_size(iomem) < 0x100)
136                 dev_err(&pdev->dev, "Invalid iomem size!\n");
137 
138         host = sdhci_alloc_host(&pdev->dev,
139                 sizeof(struct sdhci_pltfm_host) + priv_size);
140 
141         if (IS_ERR(host)) {
142                 ret = PTR_ERR(host);
143                 goto err;
144         }
145 
146         host->hw_name = dev_name(&pdev->dev);
147         if (pdata && pdata->ops)
148                 host->ops = pdata->ops;
149         else
150                 host->ops = &sdhci_pltfm_ops;
151         if (pdata) {
152                 host->quirks = pdata->quirks;
153                 host->quirks2 = pdata->quirks2;
154         }
155 
156         host->irq = platform_get_irq(pdev, 0);
157 
158         if (!request_mem_region(iomem->start, resource_size(iomem),
159                 mmc_hostname(host->mmc))) {
160                 dev_err(&pdev->dev, "cannot request region\n");
161                 ret = -EBUSY;
162                 goto err_request;
163         }
164 
165         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
166         if (!host->ioaddr) {
167                 dev_err(&pdev->dev, "failed to remap registers\n");
168                 ret = -ENOMEM;
169                 goto err_remap;
170         }
171 
172         /*
173          * Some platforms need to probe the controller to be able to
174          * determine which caps should be used.
175          */
176         if (host->ops && host->ops->platform_init)
177                 host->ops->platform_init(host);
178 
179         platform_set_drvdata(pdev, host);
180 
181         return host;
182 
183 err_remap:
184         release_mem_region(iomem->start, resource_size(iomem));
185 err_request:
186         sdhci_free_host(host);
187 err:
188         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
189         return ERR_PTR(ret);
190 }
191 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
192 
193 void sdhci_pltfm_free(struct platform_device *pdev)
194 {
195         struct sdhci_host *host = platform_get_drvdata(pdev);
196         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
197 
198         iounmap(host->ioaddr);
199         release_mem_region(iomem->start, resource_size(iomem));
200         sdhci_free_host(host);
201 }
202 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
203 
204 int sdhci_pltfm_register(struct platform_device *pdev,
205                         const struct sdhci_pltfm_data *pdata,
206                         size_t priv_size)
207 {
208         struct sdhci_host *host;
209         int ret = 0;
210 
211         host = sdhci_pltfm_init(pdev, pdata, priv_size);
212         if (IS_ERR(host))
213                 return PTR_ERR(host);
214 
215         sdhci_get_of_property(pdev);
216 
217         ret = sdhci_add_host(host);
218         if (ret)
219                 sdhci_pltfm_free(pdev);
220 
221         return ret;
222 }
223 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
224 
225 int sdhci_pltfm_unregister(struct platform_device *pdev)
226 {
227         struct sdhci_host *host = platform_get_drvdata(pdev);
228         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
229 
230         sdhci_remove_host(host, dead);
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