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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         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 device_node *np = pdev->dev.of_node;
127         struct resource *iomem;
128         int ret;
129 
130         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
131         if (!iomem) {
132                 ret = -ENOMEM;
133                 goto err;
134         }
135 
136         if (resource_size(iomem) < 0x100)
137                 dev_err(&pdev->dev, "Invalid iomem size!\n");
138 
139         /* Some PCI-based MFD need the parent here */
140         if (pdev->dev.parent != &platform_bus && !np)
141                 host = sdhci_alloc_host(pdev->dev.parent,
142                         sizeof(struct sdhci_pltfm_host) + priv_size);
143         else
144                 host = sdhci_alloc_host(&pdev->dev,
145                         sizeof(struct sdhci_pltfm_host) + priv_size);
146 
147         if (IS_ERR(host)) {
148                 ret = PTR_ERR(host);
149                 goto err;
150         }
151 
152         host->hw_name = dev_name(&pdev->dev);
153         if (pdata && pdata->ops)
154                 host->ops = pdata->ops;
155         else
156                 host->ops = &sdhci_pltfm_ops;
157         if (pdata) {
158                 host->quirks = pdata->quirks;
159                 host->quirks2 = pdata->quirks2;
160         }
161 
162         host->irq = platform_get_irq(pdev, 0);
163 
164         if (!request_mem_region(iomem->start, resource_size(iomem),
165                 mmc_hostname(host->mmc))) {
166                 dev_err(&pdev->dev, "cannot request region\n");
167                 ret = -EBUSY;
168                 goto err_request;
169         }
170 
171         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
172         if (!host->ioaddr) {
173                 dev_err(&pdev->dev, "failed to remap registers\n");
174                 ret = -ENOMEM;
175                 goto err_remap;
176         }
177 
178         /*
179          * Some platforms need to probe the controller to be able to
180          * determine which caps should be used.
181          */
182         if (host->ops && host->ops->platform_init)
183                 host->ops->platform_init(host);
184 
185         platform_set_drvdata(pdev, host);
186 
187         return host;
188 
189 err_remap:
190         release_mem_region(iomem->start, resource_size(iomem));
191 err_request:
192         sdhci_free_host(host);
193 err:
194         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
195         return ERR_PTR(ret);
196 }
197 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
198 
199 void sdhci_pltfm_free(struct platform_device *pdev)
200 {
201         struct sdhci_host *host = platform_get_drvdata(pdev);
202         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
203 
204         iounmap(host->ioaddr);
205         release_mem_region(iomem->start, resource_size(iomem));
206         sdhci_free_host(host);
207 }
208 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
209 
210 int sdhci_pltfm_register(struct platform_device *pdev,
211                         const struct sdhci_pltfm_data *pdata,
212                         size_t priv_size)
213 {
214         struct sdhci_host *host;
215         int ret = 0;
216 
217         host = sdhci_pltfm_init(pdev, pdata, priv_size);
218         if (IS_ERR(host))
219                 return PTR_ERR(host);
220 
221         sdhci_get_of_property(pdev);
222 
223         ret = sdhci_add_host(host);
224         if (ret)
225                 sdhci_pltfm_free(pdev);
226 
227         return ret;
228 }
229 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
230 
231 int sdhci_pltfm_unregister(struct platform_device *pdev)
232 {
233         struct sdhci_host *host = platform_get_drvdata(pdev);
234         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
235 
236         sdhci_remove_host(host, dead);
237         sdhci_pltfm_free(pdev);
238 
239         return 0;
240 }
241 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
242 
243 #ifdef CONFIG_PM
244 int sdhci_pltfm_suspend(struct device *dev)
245 {
246         struct sdhci_host *host = dev_get_drvdata(dev);
247 
248         return sdhci_suspend_host(host);
249 }
250 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
251 
252 int sdhci_pltfm_resume(struct device *dev)
253 {
254         struct sdhci_host *host = dev_get_drvdata(dev);
255 
256         return sdhci_resume_host(host);
257 }
258 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
259 
260 const struct dev_pm_ops sdhci_pltfm_pmops = {
261         .suspend        = sdhci_pltfm_suspend,
262         .resume         = sdhci_pltfm_resume,
263 };
264 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
265 #endif  /* CONFIG_PM */
266 
267 static int __init sdhci_pltfm_drv_init(void)
268 {
269         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
270 
271         return 0;
272 }
273 module_init(sdhci_pltfm_drv_init);
274 
275 static void __exit sdhci_pltfm_drv_exit(void)
276 {
277 }
278 module_exit(sdhci_pltfm_drv_exit);
279 
280 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
281 MODULE_AUTHOR("Intel Corporation");
282 MODULE_LICENSE("GPL v2");
283 

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