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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         int ret;
123 
124         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
125         if (!iomem) {
126                 ret = -ENOMEM;
127                 goto err;
128         }
129 
130         if (resource_size(iomem) < 0x100)
131                 dev_err(&pdev->dev, "Invalid iomem size!\n");
132 
133         host = sdhci_alloc_host(&pdev->dev,
134                 sizeof(struct sdhci_pltfm_host) + priv_size);
135 
136         if (IS_ERR(host)) {
137                 ret = PTR_ERR(host);
138                 goto err;
139         }
140 
141         host->hw_name = dev_name(&pdev->dev);
142         if (pdata && pdata->ops)
143                 host->ops = pdata->ops;
144         else
145                 host->ops = &sdhci_pltfm_ops;
146         if (pdata) {
147                 host->quirks = pdata->quirks;
148                 host->quirks2 = pdata->quirks2;
149         }
150 
151         host->irq = platform_get_irq(pdev, 0);
152 
153         if (!request_mem_region(iomem->start, resource_size(iomem),
154                 mmc_hostname(host->mmc))) {
155                 dev_err(&pdev->dev, "cannot request region\n");
156                 ret = -EBUSY;
157                 goto err_request;
158         }
159 
160         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
161         if (!host->ioaddr) {
162                 dev_err(&pdev->dev, "failed to remap registers\n");
163                 ret = -ENOMEM;
164                 goto err_remap;
165         }
166 
167         /*
168          * Some platforms need to probe the controller to be able to
169          * determine which caps should be used.
170          */
171         if (host->ops && host->ops->platform_init)
172                 host->ops->platform_init(host);
173 
174         platform_set_drvdata(pdev, host);
175 
176         return host;
177 
178 err_remap:
179         release_mem_region(iomem->start, resource_size(iomem));
180 err_request:
181         sdhci_free_host(host);
182 err:
183         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
184         return ERR_PTR(ret);
185 }
186 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
187 
188 void sdhci_pltfm_free(struct platform_device *pdev)
189 {
190         struct sdhci_host *host = platform_get_drvdata(pdev);
191         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
192 
193         iounmap(host->ioaddr);
194         release_mem_region(iomem->start, resource_size(iomem));
195         sdhci_free_host(host);
196 }
197 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
198 
199 int sdhci_pltfm_register(struct platform_device *pdev,
200                         const struct sdhci_pltfm_data *pdata,
201                         size_t priv_size)
202 {
203         struct sdhci_host *host;
204         int ret = 0;
205 
206         host = sdhci_pltfm_init(pdev, pdata, priv_size);
207         if (IS_ERR(host))
208                 return PTR_ERR(host);
209 
210         sdhci_get_of_property(pdev);
211 
212         ret = sdhci_add_host(host);
213         if (ret)
214                 sdhci_pltfm_free(pdev);
215 
216         return ret;
217 }
218 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
219 
220 int sdhci_pltfm_unregister(struct platform_device *pdev)
221 {
222         struct sdhci_host *host = platform_get_drvdata(pdev);
223         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
224         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
225 
226         sdhci_remove_host(host, dead);
227         clk_disable_unprepare(pltfm_host->clk);
228         sdhci_pltfm_free(pdev);
229 
230         return 0;
231 }
232 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
233 
234 #ifdef CONFIG_PM
235 int sdhci_pltfm_suspend(struct device *dev)
236 {
237         struct sdhci_host *host = dev_get_drvdata(dev);
238 
239         return sdhci_suspend_host(host);
240 }
241 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
242 
243 int sdhci_pltfm_resume(struct device *dev)
244 {
245         struct sdhci_host *host = dev_get_drvdata(dev);
246 
247         return sdhci_resume_host(host);
248 }
249 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
250 
251 const struct dev_pm_ops sdhci_pltfm_pmops = {
252         .suspend        = sdhci_pltfm_suspend,
253         .resume         = sdhci_pltfm_resume,
254 };
255 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
256 #endif  /* CONFIG_PM */
257 
258 static int __init sdhci_pltfm_drv_init(void)
259 {
260         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
261 
262         return 0;
263 }
264 module_init(sdhci_pltfm_drv_init);
265 
266 static void __exit sdhci_pltfm_drv_exit(void)
267 {
268 }
269 module_exit(sdhci_pltfm_drv_exit);
270 
271 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
272 MODULE_AUTHOR("Intel Corporation");
273 MODULE_LICENSE("GPL v2");
274 

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