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 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
sdhci_get_of_property(struct platform_device * pdev)112 void sdhci_get_of_property(struct platform_device *pdev) {}
113 #endif /* CONFIG_OF */
114 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
115
sdhci_pltfm_init(struct platform_device * pdev,const struct sdhci_pltfm_data * pdata,size_t priv_size)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 void __iomem *ioaddr;
123 int irq, ret;
124
125 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
126 ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
127 if (IS_ERR(ioaddr)) {
128 ret = PTR_ERR(ioaddr);
129 goto err;
130 }
131
132 irq = platform_get_irq(pdev, 0);
133 if (irq < 0) {
134 dev_err(&pdev->dev, "failed to get IRQ number\n");
135 ret = irq;
136 goto err;
137 }
138
139 host = sdhci_alloc_host(&pdev->dev,
140 sizeof(struct sdhci_pltfm_host) + priv_size);
141
142 if (IS_ERR(host)) {
143 ret = PTR_ERR(host);
144 goto err;
145 }
146
147 host->ioaddr = ioaddr;
148 host->irq = irq;
149 host->hw_name = dev_name(&pdev->dev);
150 if (pdata && pdata->ops)
151 host->ops = pdata->ops;
152 else
153 host->ops = &sdhci_pltfm_ops;
154 if (pdata) {
155 host->quirks = pdata->quirks;
156 host->quirks2 = pdata->quirks2;
157 }
158
159 platform_set_drvdata(pdev, host);
160
161 return host;
162 err:
163 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
164 return ERR_PTR(ret);
165 }
166 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
167
sdhci_pltfm_free(struct platform_device * pdev)168 void sdhci_pltfm_free(struct platform_device *pdev)
169 {
170 struct sdhci_host *host = platform_get_drvdata(pdev);
171
172 sdhci_free_host(host);
173 }
174 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
175
sdhci_pltfm_register(struct platform_device * pdev,const struct sdhci_pltfm_data * pdata,size_t priv_size)176 int sdhci_pltfm_register(struct platform_device *pdev,
177 const struct sdhci_pltfm_data *pdata,
178 size_t priv_size)
179 {
180 struct sdhci_host *host;
181 int ret = 0;
182
183 host = sdhci_pltfm_init(pdev, pdata, priv_size);
184 if (IS_ERR(host))
185 return PTR_ERR(host);
186
187 sdhci_get_of_property(pdev);
188
189 ret = sdhci_add_host(host);
190 if (ret)
191 sdhci_pltfm_free(pdev);
192
193 return ret;
194 }
195 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
196
sdhci_pltfm_unregister(struct platform_device * pdev)197 int sdhci_pltfm_unregister(struct platform_device *pdev)
198 {
199 struct sdhci_host *host = platform_get_drvdata(pdev);
200 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
201 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
202
203 sdhci_remove_host(host, dead);
204 clk_disable_unprepare(pltfm_host->clk);
205 sdhci_pltfm_free(pdev);
206
207 return 0;
208 }
209 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
210
211 #ifdef CONFIG_PM_SLEEP
sdhci_pltfm_suspend(struct device * dev)212 static int sdhci_pltfm_suspend(struct device *dev)
213 {
214 struct sdhci_host *host = dev_get_drvdata(dev);
215
216 return sdhci_suspend_host(host);
217 }
218
sdhci_pltfm_resume(struct device * dev)219 static int sdhci_pltfm_resume(struct device *dev)
220 {
221 struct sdhci_host *host = dev_get_drvdata(dev);
222
223 return sdhci_resume_host(host);
224 }
225 #endif
226
227 const struct dev_pm_ops sdhci_pltfm_pmops = {
228 SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume)
229 };
230 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
231
sdhci_pltfm_drv_init(void)232 static int __init sdhci_pltfm_drv_init(void)
233 {
234 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
235
236 return 0;
237 }
238 module_init(sdhci_pltfm_drv_init);
239
sdhci_pltfm_drv_exit(void)240 static void __exit sdhci_pltfm_drv_exit(void)
241 {
242 }
243 module_exit(sdhci_pltfm_drv_exit);
244
245 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
246 MODULE_AUTHOR("Intel Corporation");
247 MODULE_LICENSE("GPL v2");
248