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
sdhci_pltfm_clk_get_max_clock(struct sdhci_host * host)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
sdhci_of_wp_inverted(struct device_node * np)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
sdhci_get_of_property(struct platform_device * pdev)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
sdhci_get_of_property(struct platform_device * pdev)115 void sdhci_get_of_property(struct platform_device *pdev) {}
116 #endif /* CONFIG_OF */
117 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
118
sdhci_pltfm_init(struct platform_device * pdev,const struct sdhci_pltfm_data * pdata,size_t priv_size)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
sdhci_pltfm_free(struct platform_device * pdev)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
sdhci_pltfm_register(struct platform_device * pdev,const struct sdhci_pltfm_data * pdata,size_t priv_size)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
sdhci_pltfm_unregister(struct platform_device * pdev)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
sdhci_pltfm_suspend(struct device * dev)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
sdhci_pltfm_resume(struct device * dev)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
sdhci_pltfm_drv_init(void)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
sdhci_pltfm_drv_exit(void)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