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16#include <linux/clk.h>
17#include <linux/delay.h>
18#include <linux/gpio.h>
19#include <linux/highmem.h>
20#include <linux/module.h>
21#include <linux/interrupt.h>
22#include <linux/irq.h>
23#include <linux/of.h>
24#include <linux/of_gpio.h>
25#include <linux/platform_device.h>
26#include <linux/pm.h>
27#include <linux/slab.h>
28#include <linux/mmc/host.h>
29#include <linux/mmc/sdhci-spear.h>
30#include <linux/mmc/slot-gpio.h>
31#include <linux/io.h>
32#include "sdhci.h"
33
34struct spear_sdhci {
35 struct clk *clk;
36 struct sdhci_plat_data *data;
37};
38
39
40static const struct sdhci_ops sdhci_pltfm_ops = {
41 .set_clock = sdhci_set_clock,
42 .set_bus_width = sdhci_set_bus_width,
43 .reset = sdhci_reset,
44 .set_uhs_signaling = sdhci_set_uhs_signaling,
45};
46
47#ifdef CONFIG_OF
48static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
49{
50 struct device_node *np = pdev->dev.of_node;
51 struct sdhci_plat_data *pdata = NULL;
52 int cd_gpio;
53
54 cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
55 if (!gpio_is_valid(cd_gpio))
56 cd_gpio = -1;
57
58
59 if (cd_gpio != -1) {
60 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
61 if (!pdata)
62 dev_err(&pdev->dev, "DT: kzalloc failed\n");
63 else
64 pdata->card_int_gpio = cd_gpio;
65 }
66
67 return pdata;
68}
69#else
70static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
71{
72 return ERR_PTR(-ENOSYS);
73}
74#endif
75
76static int sdhci_probe(struct platform_device *pdev)
77{
78 struct device_node *np = pdev->dev.of_node;
79 struct sdhci_host *host;
80 struct resource *iomem;
81 struct spear_sdhci *sdhci;
82 struct device *dev;
83 int ret;
84
85 dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
86 host = sdhci_alloc_host(dev, sizeof(*sdhci));
87 if (IS_ERR(host)) {
88 ret = PTR_ERR(host);
89 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
90 goto err;
91 }
92
93 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
94 host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
95 if (IS_ERR(host->ioaddr)) {
96 ret = PTR_ERR(host->ioaddr);
97 dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
98 goto err_host;
99 }
100
101 host->hw_name = "sdhci";
102 host->ops = &sdhci_pltfm_ops;
103 host->irq = platform_get_irq(pdev, 0);
104 host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
105
106 sdhci = sdhci_priv(host);
107
108
109 sdhci->clk = devm_clk_get(&pdev->dev, NULL);
110 if (IS_ERR(sdhci->clk)) {
111 ret = PTR_ERR(sdhci->clk);
112 dev_dbg(&pdev->dev, "Error getting clock\n");
113 goto err_host;
114 }
115
116 ret = clk_prepare_enable(sdhci->clk);
117 if (ret) {
118 dev_dbg(&pdev->dev, "Error enabling clock\n");
119 goto err_host;
120 }
121
122 ret = clk_set_rate(sdhci->clk, 50000000);
123 if (ret)
124 dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
125 clk_get_rate(sdhci->clk));
126
127 if (np) {
128 sdhci->data = sdhci_probe_config_dt(pdev);
129 if (IS_ERR(sdhci->data)) {
130 dev_err(&pdev->dev, "DT: Failed to get pdata\n");
131 goto disable_clk;
132 }
133 } else {
134 sdhci->data = dev_get_platdata(&pdev->dev);
135 }
136
137
138
139
140
141
142 if (sdhci->data && sdhci->data->card_int_gpio >= 0) {
143 ret = mmc_gpio_request_cd(host->mmc,
144 sdhci->data->card_int_gpio, 0);
145 if (ret < 0) {
146 dev_dbg(&pdev->dev,
147 "failed to request card-detect gpio%d\n",
148 sdhci->data->card_int_gpio);
149 goto disable_clk;
150 }
151 }
152
153 ret = sdhci_add_host(host);
154 if (ret) {
155 dev_dbg(&pdev->dev, "error adding host\n");
156 goto disable_clk;
157 }
158
159 platform_set_drvdata(pdev, host);
160
161 return 0;
162
163disable_clk:
164 clk_disable_unprepare(sdhci->clk);
165err_host:
166 sdhci_free_host(host);
167err:
168 dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
169 return ret;
170}
171
172static int sdhci_remove(struct platform_device *pdev)
173{
174 struct sdhci_host *host = platform_get_drvdata(pdev);
175 struct spear_sdhci *sdhci = sdhci_priv(host);
176 int dead = 0;
177 u32 scratch;
178
179 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
180 if (scratch == (u32)-1)
181 dead = 1;
182
183 sdhci_remove_host(host, dead);
184 clk_disable_unprepare(sdhci->clk);
185 sdhci_free_host(host);
186
187 return 0;
188}
189
190#ifdef CONFIG_PM_SLEEP
191static int sdhci_suspend(struct device *dev)
192{
193 struct sdhci_host *host = dev_get_drvdata(dev);
194 struct spear_sdhci *sdhci = sdhci_priv(host);
195 int ret;
196
197 ret = sdhci_suspend_host(host);
198 if (!ret)
199 clk_disable(sdhci->clk);
200
201 return ret;
202}
203
204static int sdhci_resume(struct device *dev)
205{
206 struct sdhci_host *host = dev_get_drvdata(dev);
207 struct spear_sdhci *sdhci = sdhci_priv(host);
208 int ret;
209
210 ret = clk_enable(sdhci->clk);
211 if (ret) {
212 dev_dbg(dev, "Resume: Error enabling clock\n");
213 return ret;
214 }
215
216 return sdhci_resume_host(host);
217}
218#endif
219
220static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
221
222#ifdef CONFIG_OF
223static const struct of_device_id sdhci_spear_id_table[] = {
224 { .compatible = "st,spear300-sdhci" },
225 {}
226};
227MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
228#endif
229
230static struct platform_driver sdhci_driver = {
231 .driver = {
232 .name = "sdhci",
233 .owner = THIS_MODULE,
234 .pm = &sdhci_pm_ops,
235 .of_match_table = of_match_ptr(sdhci_spear_id_table),
236 },
237 .probe = sdhci_probe,
238 .remove = sdhci_remove,
239};
240
241module_platform_driver(sdhci_driver);
242
243MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
244MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
245MODULE_LICENSE("GPL v2");
246
