1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * sdhci-pltfm.c Support for SDHCI platform devices
4 * Copyright (c) 2009 Intel Corporation
5 *
6 * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.
7 * Copyright (c) 2009 MontaVista Software, Inc.
8 *
9 * Authors: Xiaobo Xie <X.Xie@freescale.com>
10 * Anton Vorontsov <avorontsov@ru.mvista.com>
11 */
12
13 /* Supports:
14 * SDHCI platform devices
15 *
16 * Inspired by sdhci-pci.c, by Pierre Ossman
17 */
18
19 #include <linux/err.h>
20 #include <linux/module.h>
21 #include <linux/property.h>
22 #include <linux/of.h>
23 #ifdef CONFIG_PPC
24 #include <asm/machdep.h>
25 #endif
26 #include "sdhci-pltfm.h"
27
sdhci_pltfm_clk_get_max_clock(struct sdhci_host * host)28 unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host)
29 {
30 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
31
32 return clk_get_rate(pltfm_host->clk);
33 }
34 EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock);
35
36 static const struct sdhci_ops sdhci_pltfm_ops = {
37 .set_clock = sdhci_set_clock,
38 .set_bus_width = sdhci_set_bus_width,
39 .reset = sdhci_reset,
40 .set_uhs_signaling = sdhci_set_uhs_signaling,
41 };
42
sdhci_wp_inverted(struct device * dev)43 static bool sdhci_wp_inverted(struct device *dev)
44 {
45 if (device_property_present(dev, "sdhci,wp-inverted") ||
46 device_property_present(dev, "wp-inverted"))
47 return true;
48
49 /* Old device trees don't have the wp-inverted property. */
50 #ifdef CONFIG_PPC
51 return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
52 #else
53 return false;
54 #endif /* CONFIG_PPC */
55 }
56
sdhci_get_compatibility(struct platform_device * pdev)57 static void sdhci_get_compatibility(struct platform_device *pdev)
58 {
59 struct sdhci_host *host = platform_get_drvdata(pdev);
60 struct device_node *np = pdev->dev.of_node;
61
62 if (!np)
63 return;
64
65 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
66 host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
67
68 if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
69 of_device_is_compatible(np, "fsl,p1010-esdhc") ||
70 of_device_is_compatible(np, "fsl,t4240-esdhc") ||
71 of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
72 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
73 }
74
sdhci_get_property(struct platform_device * pdev)75 void sdhci_get_property(struct platform_device *pdev)
76 {
77 struct device *dev = &pdev->dev;
78 struct sdhci_host *host = platform_get_drvdata(pdev);
79 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
80 u32 bus_width;
81
82 if (device_property_present(dev, "sdhci,auto-cmd12"))
83 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
84
85 if (device_property_present(dev, "sdhci,1-bit-only") ||
86 (device_property_read_u32(dev, "bus-width", &bus_width) == 0 &&
87 bus_width == 1))
88 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
89
90 if (sdhci_wp_inverted(dev))
91 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
92
93 if (device_property_present(dev, "broken-cd"))
94 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
95
96 if (device_property_present(dev, "no-1-8-v"))
97 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
98
99 sdhci_get_compatibility(pdev);
100
101 device_property_read_u32(dev, "clock-frequency", &pltfm_host->clock);
102
103 if (device_property_present(dev, "keep-power-in-suspend"))
104 host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
105
106 if (device_property_read_bool(dev, "wakeup-source") ||
107 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
108 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
109 }
110 EXPORT_SYMBOL_GPL(sdhci_get_property);
111
sdhci_pltfm_init(struct platform_device * pdev,const struct sdhci_pltfm_data * pdata,size_t priv_size)112 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
113 const struct sdhci_pltfm_data *pdata,
114 size_t priv_size)
115 {
116 struct sdhci_host *host;
117 void __iomem *ioaddr;
118 int irq, ret;
119
120 ioaddr = devm_platform_ioremap_resource(pdev, 0);
121 if (IS_ERR(ioaddr)) {
122 ret = PTR_ERR(ioaddr);
123 goto err;
124 }
125
126 irq = platform_get_irq(pdev, 0);
127 if (irq < 0) {
128 ret = irq;
129 goto err;
130 }
131
132 host = sdhci_alloc_host(&pdev->dev,
133 sizeof(struct sdhci_pltfm_host) + priv_size);
134
135 if (IS_ERR(host)) {
136 ret = PTR_ERR(host);
137 goto err;
138 }
139
140 host->ioaddr = ioaddr;
141 host->irq = irq;
142 host->hw_name = dev_name(&pdev->dev);
143 if (pdata && pdata->ops)
144 host->ops = pdata->ops;
145 else
146 host->ops = &sdhci_pltfm_ops;
147 if (pdata) {
148 host->quirks = pdata->quirks;
149 host->quirks2 = pdata->quirks2;
150 }
151
152 platform_set_drvdata(pdev, host);
153
154 return host;
155 err:
156 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
157 return ERR_PTR(ret);
158 }
159 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
160
sdhci_pltfm_free(struct platform_device * pdev)161 void sdhci_pltfm_free(struct platform_device *pdev)
162 {
163 struct sdhci_host *host = platform_get_drvdata(pdev);
164
165 sdhci_free_host(host);
166 }
167 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
168
sdhci_pltfm_init_and_add_host(struct platform_device * pdev,const struct sdhci_pltfm_data * pdata,size_t priv_size)169 int sdhci_pltfm_init_and_add_host(struct platform_device *pdev,
170 const struct sdhci_pltfm_data *pdata,
171 size_t priv_size)
172 {
173 struct sdhci_host *host;
174 int ret = 0;
175
176 host = sdhci_pltfm_init(pdev, pdata, priv_size);
177 if (IS_ERR(host))
178 return PTR_ERR(host);
179
180 sdhci_get_property(pdev);
181
182 ret = sdhci_add_host(host);
183 if (ret)
184 sdhci_pltfm_free(pdev);
185
186 return ret;
187 }
188 EXPORT_SYMBOL_GPL(sdhci_pltfm_init_and_add_host);
189
sdhci_pltfm_remove(struct platform_device * pdev)190 void sdhci_pltfm_remove(struct platform_device *pdev)
191 {
192 struct sdhci_host *host = platform_get_drvdata(pdev);
193 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
194
195 sdhci_remove_host(host, dead);
196 sdhci_pltfm_free(pdev);
197 }
198 EXPORT_SYMBOL_GPL(sdhci_pltfm_remove);
199
200 #ifdef CONFIG_PM_SLEEP
sdhci_pltfm_suspend(struct device * dev)201 int sdhci_pltfm_suspend(struct device *dev)
202 {
203 struct sdhci_host *host = dev_get_drvdata(dev);
204 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
205 int ret;
206
207 if (host->tuning_mode != SDHCI_TUNING_MODE_3)
208 mmc_retune_needed(host->mmc);
209
210 ret = sdhci_suspend_host(host);
211 if (ret)
212 return ret;
213
214 clk_disable_unprepare(pltfm_host->clk);
215
216 return 0;
217 }
218 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
219
sdhci_pltfm_resume(struct device * dev)220 int sdhci_pltfm_resume(struct device *dev)
221 {
222 struct sdhci_host *host = dev_get_drvdata(dev);
223 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
224 int ret;
225
226 ret = clk_prepare_enable(pltfm_host->clk);
227 if (ret)
228 return ret;
229
230 ret = sdhci_resume_host(host);
231 if (ret)
232 clk_disable_unprepare(pltfm_host->clk);
233
234 return ret;
235 }
236 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
237 #endif
238
239 const struct dev_pm_ops sdhci_pltfm_pmops = {
240 SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume)
241 };
242 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
243
sdhci_pltfm_drv_init(void)244 static int __init sdhci_pltfm_drv_init(void)
245 {
246 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
247
248 return 0;
249 }
250 module_init(sdhci_pltfm_drv_init);
251
sdhci_pltfm_drv_exit(void)252 static void __exit sdhci_pltfm_drv_exit(void)
253 {
254 }
255 module_exit(sdhci_pltfm_drv_exit);
256
257 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
258 MODULE_AUTHOR("Intel Corporation");
259 MODULE_LICENSE("GPL v2");
260