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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 };
 49 
 50 #ifdef CONFIG_OF
 51 static bool sdhci_of_wp_inverted(struct device_node *np)
 52 {
 53         if (of_get_property(np, "sdhci,wp-inverted", NULL) ||
 54             of_get_property(np, "wp-inverted", NULL))
 55                 return true;
 56 
 57         /* Old device trees don't have the wp-inverted property. */
 58 #ifdef CONFIG_PPC
 59         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
 60 #else
 61         return false;
 62 #endif /* CONFIG_PPC */
 63 }
 64 
 65 void sdhci_get_of_property(struct platform_device *pdev)
 66 {
 67         struct device_node *np = pdev->dev.of_node;
 68         struct sdhci_host *host = platform_get_drvdata(pdev);
 69         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 70         const __be32 *clk;
 71         u32 bus_width;
 72         int size;
 73 
 74         if (of_device_is_available(np)) {
 75                 if (of_get_property(np, "sdhci,auto-cmd12", NULL))
 76                         host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
 77 
 78                 if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
 79                     (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
 80                     bus_width == 1))
 81                         host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
 82 
 83                 if (sdhci_of_wp_inverted(np))
 84                         host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
 85 
 86                 if (of_get_property(np, "broken-cd", NULL))
 87                         host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
 88 
 89                 if (of_get_property(np, "no-1-8-v", NULL))
 90                         host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
 91 
 92                 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
 93                         host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
 94 
 95                 if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
 96                     of_device_is_compatible(np, "fsl,p1010-esdhc") ||
 97                     of_device_is_compatible(np, "fsl,t4240-esdhc") ||
 98                     of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
 99                         host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
100 
101                 clk = of_get_property(np, "clock-frequency", &size);
102                 if (clk && size == sizeof(*clk) && *clk)
103                         pltfm_host->clock = be32_to_cpup(clk);
104 
105                 if (of_find_property(np, "keep-power-in-suspend", NULL))
106                         host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
107 
108                 if (of_find_property(np, "enable-sdio-wakeup", NULL))
109                         host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
110         }
111 }
112 #else
113 void sdhci_get_of_property(struct platform_device *pdev) {}
114 #endif /* CONFIG_OF */
115 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
116 
117 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
118                                     const struct sdhci_pltfm_data *pdata,
119                                     size_t priv_size)
120 {
121         struct sdhci_host *host;
122         struct device_node *np = pdev->dev.of_node;
123         struct resource *iomem;
124         int ret;
125 
126         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
127         if (!iomem) {
128                 ret = -ENOMEM;
129                 goto err;
130         }
131 
132         if (resource_size(iomem) < 0x100)
133                 dev_err(&pdev->dev, "Invalid iomem size!\n");
134 
135         /* Some PCI-based MFD need the parent here */
136         if (pdev->dev.parent != &platform_bus && !np)
137                 host = sdhci_alloc_host(pdev->dev.parent,
138                         sizeof(struct sdhci_pltfm_host) + priv_size);
139         else
140                 host = sdhci_alloc_host(&pdev->dev,
141                         sizeof(struct sdhci_pltfm_host) + priv_size);
142 
143         if (IS_ERR(host)) {
144                 ret = PTR_ERR(host);
145                 goto err;
146         }
147 
148         host->hw_name = dev_name(&pdev->dev);
149         if (pdata && pdata->ops)
150                 host->ops = pdata->ops;
151         else
152                 host->ops = &sdhci_pltfm_ops;
153         if (pdata) {
154                 host->quirks = pdata->quirks;
155                 host->quirks2 = pdata->quirks2;
156         }
157 
158         host->irq = platform_get_irq(pdev, 0);
159 
160         if (!request_mem_region(iomem->start, resource_size(iomem),
161                 mmc_hostname(host->mmc))) {
162                 dev_err(&pdev->dev, "cannot request region\n");
163                 ret = -EBUSY;
164                 goto err_request;
165         }
166 
167         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
168         if (!host->ioaddr) {
169                 dev_err(&pdev->dev, "failed to remap registers\n");
170                 ret = -ENOMEM;
171                 goto err_remap;
172         }
173 
174         /*
175          * Some platforms need to probe the controller to be able to
176          * determine which caps should be used.
177          */
178         if (host->ops && host->ops->platform_init)
179                 host->ops->platform_init(host);
180 
181         platform_set_drvdata(pdev, host);
182 
183         return host;
184 
185 err_remap:
186         release_mem_region(iomem->start, resource_size(iomem));
187 err_request:
188         sdhci_free_host(host);
189 err:
190         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
191         return ERR_PTR(ret);
192 }
193 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
194 
195 void sdhci_pltfm_free(struct platform_device *pdev)
196 {
197         struct sdhci_host *host = platform_get_drvdata(pdev);
198         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
199 
200         iounmap(host->ioaddr);
201         release_mem_region(iomem->start, resource_size(iomem));
202         sdhci_free_host(host);
203 }
204 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
205 
206 int sdhci_pltfm_register(struct platform_device *pdev,
207                         const struct sdhci_pltfm_data *pdata,
208                         size_t priv_size)
209 {
210         struct sdhci_host *host;
211         int ret = 0;
212 
213         host = sdhci_pltfm_init(pdev, pdata, priv_size);
214         if (IS_ERR(host))
215                 return PTR_ERR(host);
216 
217         sdhci_get_of_property(pdev);
218 
219         ret = sdhci_add_host(host);
220         if (ret)
221                 sdhci_pltfm_free(pdev);
222 
223         return ret;
224 }
225 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
226 
227 int sdhci_pltfm_unregister(struct platform_device *pdev)
228 {
229         struct sdhci_host *host = platform_get_drvdata(pdev);
230         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
231 
232         sdhci_remove_host(host, dead);
233         sdhci_pltfm_free(pdev);
234 
235         return 0;
236 }
237 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
238 
239 #ifdef CONFIG_PM
240 int sdhci_pltfm_suspend(struct device *dev)
241 {
242         struct sdhci_host *host = dev_get_drvdata(dev);
243 
244         return sdhci_suspend_host(host);
245 }
246 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
247 
248 int sdhci_pltfm_resume(struct device *dev)
249 {
250         struct sdhci_host *host = dev_get_drvdata(dev);
251 
252         return sdhci_resume_host(host);
253 }
254 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
255 
256 const struct dev_pm_ops sdhci_pltfm_pmops = {
257         .suspend        = sdhci_pltfm_suspend,
258         .resume         = sdhci_pltfm_resume,
259 };
260 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
261 #endif  /* CONFIG_PM */
262 
263 static int __init sdhci_pltfm_drv_init(void)
264 {
265         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
266 
267         return 0;
268 }
269 module_init(sdhci_pltfm_drv_init);
270 
271 static void __exit sdhci_pltfm_drv_exit(void)
272 {
273 }
274 module_exit(sdhci_pltfm_drv_exit);
275 
276 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
277 MODULE_AUTHOR("Intel Corporation");
278 MODULE_LICENSE("GPL v2");
279 

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