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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/io.h>
31#include "sdhci.h"
32
33struct spear_sdhci {
34 struct clk *clk;
35 struct sdhci_plat_data *data;
36};
37
38
39static const struct sdhci_ops sdhci_pltfm_ops = {
40
41};
42
43
44static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
45{
46 struct platform_device *pdev = dev_id;
47 struct sdhci_host *host = platform_get_drvdata(pdev);
48 struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
49 unsigned long gpio_irq_type;
50 int val;
51
52 val = gpio_get_value(sdhci->data->card_int_gpio);
53
54
55
56 gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
57 irq_set_irq_type(irq, gpio_irq_type);
58
59 if (sdhci->data->card_power_gpio >= 0) {
60 if (!sdhci->data->power_always_enb) {
61
62 val = sdhci->data->power_active_high ? !val : val ;
63 gpio_set_value(sdhci->data->card_power_gpio, val);
64 }
65 }
66
67
68 tasklet_schedule(&host->card_tasklet);
69
70 return IRQ_HANDLED;
71}
72
73#ifdef CONFIG_OF
74static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
75{
76 struct device_node *np = pdev->dev.of_node;
77 struct sdhci_plat_data *pdata = NULL;
78 int cd_gpio;
79
80 cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
81 if (!gpio_is_valid(cd_gpio))
82 cd_gpio = -1;
83
84
85 if (cd_gpio != -1) {
86 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
87 if (!pdata) {
88 dev_err(&pdev->dev, "DT: kzalloc failed\n");
89 return ERR_PTR(-ENOMEM);
90 }
91 }
92
93 pdata->card_int_gpio = cd_gpio;
94
95 return pdata;
96}
97#else
98static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
99{
100 return ERR_PTR(-ENOSYS);
101}
102#endif
103
104static int sdhci_probe(struct platform_device *pdev)
105{
106 struct device_node *np = pdev->dev.of_node;
107 struct sdhci_host *host;
108 struct resource *iomem;
109 struct spear_sdhci *sdhci;
110 int ret;
111
112 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
113 if (!iomem) {
114 ret = -ENOMEM;
115 dev_dbg(&pdev->dev, "memory resource not defined\n");
116 goto err;
117 }
118
119 if (!devm_request_mem_region(&pdev->dev, iomem->start,
120 resource_size(iomem), "spear-sdhci")) {
121 ret = -EBUSY;
122 dev_dbg(&pdev->dev, "cannot request region\n");
123 goto err;
124 }
125
126 sdhci = devm_kzalloc(&pdev->dev, sizeof(*sdhci), GFP_KERNEL);
127 if (!sdhci) {
128 ret = -ENOMEM;
129 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
130 goto err;
131 }
132
133
134 sdhci->clk = clk_get(&pdev->dev, NULL);
135 if (IS_ERR(sdhci->clk)) {
136 ret = PTR_ERR(sdhci->clk);
137 dev_dbg(&pdev->dev, "Error getting clock\n");
138 goto err;
139 }
140
141 ret = clk_prepare_enable(sdhci->clk);
142 if (ret) {
143 dev_dbg(&pdev->dev, "Error enabling clock\n");
144 goto put_clk;
145 }
146
147 ret = clk_set_rate(sdhci->clk, 50000000);
148 if (ret)
149 dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
150 clk_get_rate(sdhci->clk));
151
152 if (np) {
153 sdhci->data = sdhci_probe_config_dt(pdev);
154 if (IS_ERR(sdhci->data)) {
155 dev_err(&pdev->dev, "DT: Failed to get pdata\n");
156 return -ENODEV;
157 }
158 } else {
159 sdhci->data = dev_get_platdata(&pdev->dev);
160 }
161
162 pdev->dev.platform_data = sdhci;
163
164 if (pdev->dev.parent)
165 host = sdhci_alloc_host(pdev->dev.parent, 0);
166 else
167 host = sdhci_alloc_host(&pdev->dev, 0);
168
169 if (IS_ERR(host)) {
170 ret = PTR_ERR(host);
171 dev_dbg(&pdev->dev, "error allocating host\n");
172 goto disable_clk;
173 }
174
175 host->hw_name = "sdhci";
176 host->ops = &sdhci_pltfm_ops;
177 host->irq = platform_get_irq(pdev, 0);
178 host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
179
180 host->ioaddr = devm_ioremap(&pdev->dev, iomem->start,
181 resource_size(iomem));
182 if (!host->ioaddr) {
183 ret = -ENOMEM;
184 dev_dbg(&pdev->dev, "failed to remap registers\n");
185 goto free_host;
186 }
187
188 ret = sdhci_add_host(host);
189 if (ret) {
190 dev_dbg(&pdev->dev, "error adding host\n");
191 goto free_host;
192 }
193
194 platform_set_drvdata(pdev, host);
195
196
197
198
199
200
201
202
203
204 if (!sdhci->data)
205 return 0;
206
207 if (sdhci->data->card_power_gpio >= 0) {
208 int val = 0;
209
210 ret = devm_gpio_request(&pdev->dev,
211 sdhci->data->card_power_gpio, "sdhci");
212 if (ret < 0) {
213 dev_dbg(&pdev->dev, "gpio request fail: %d\n",
214 sdhci->data->card_power_gpio);
215 goto set_drvdata;
216 }
217
218 if (sdhci->data->power_always_enb)
219 val = sdhci->data->power_active_high;
220 else
221 val = !sdhci->data->power_active_high;
222
223 ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
224 if (ret) {
225 dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
226 sdhci->data->card_power_gpio);
227 goto set_drvdata;
228 }
229 }
230
231 if (sdhci->data->card_int_gpio >= 0) {
232 ret = devm_gpio_request(&pdev->dev, sdhci->data->card_int_gpio,
233 "sdhci");
234 if (ret < 0) {
235 dev_dbg(&pdev->dev, "gpio request fail: %d\n",
236 sdhci->data->card_int_gpio);
237 goto set_drvdata;
238 }
239
240 ret = gpio_direction_input(sdhci->data->card_int_gpio);
241 if (ret) {
242 dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
243 sdhci->data->card_int_gpio);
244 goto set_drvdata;
245 }
246 ret = devm_request_irq(&pdev->dev,
247 gpio_to_irq(sdhci->data->card_int_gpio),
248 sdhci_gpio_irq, IRQF_TRIGGER_LOW,
249 mmc_hostname(host->mmc), pdev);
250 if (ret) {
251 dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
252 sdhci->data->card_int_gpio);
253 goto set_drvdata;
254 }
255
256 }
257
258 return 0;
259
260set_drvdata:
261 sdhci_remove_host(host, 1);
262free_host:
263 sdhci_free_host(host);
264disable_clk:
265 clk_disable_unprepare(sdhci->clk);
266put_clk:
267 clk_put(sdhci->clk);
268err:
269 dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
270 return ret;
271}
272
273static int sdhci_remove(struct platform_device *pdev)
274{
275 struct sdhci_host *host = platform_get_drvdata(pdev);
276 struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
277 int dead = 0;
278 u32 scratch;
279
280 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
281 if (scratch == (u32)-1)
282 dead = 1;
283
284 sdhci_remove_host(host, dead);
285 sdhci_free_host(host);
286 clk_disable_unprepare(sdhci->clk);
287 clk_put(sdhci->clk);
288
289 return 0;
290}
291
292#ifdef CONFIG_PM_SLEEP
293static int sdhci_suspend(struct device *dev)
294{
295 struct sdhci_host *host = dev_get_drvdata(dev);
296 struct spear_sdhci *sdhci = dev_get_platdata(dev);
297 int ret;
298
299 ret = sdhci_suspend_host(host);
300 if (!ret)
301 clk_disable(sdhci->clk);
302
303 return ret;
304}
305
306static int sdhci_resume(struct device *dev)
307{
308 struct sdhci_host *host = dev_get_drvdata(dev);
309 struct spear_sdhci *sdhci = dev_get_platdata(dev);
310 int ret;
311
312 ret = clk_enable(sdhci->clk);
313 if (ret) {
314 dev_dbg(dev, "Resume: Error enabling clock\n");
315 return ret;
316 }
317
318 return sdhci_resume_host(host);
319}
320#endif
321
322static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
323
324#ifdef CONFIG_OF
325static const struct of_device_id sdhci_spear_id_table[] = {
326 { .compatible = "st,spear300-sdhci" },
327 {}
328};
329MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
330#endif
331
332static struct platform_driver sdhci_driver = {
333 .driver = {
334 .name = "sdhci",
335 .owner = THIS_MODULE,
336 .pm = &sdhci_pm_ops,
337 .of_match_table = of_match_ptr(sdhci_spear_id_table),
338 },
339 .probe = sdhci_probe,
340 .remove = sdhci_remove,
341};
342
343module_platform_driver(sdhci_driver);
344
345MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
346MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
347MODULE_LICENSE("GPL v2");
348
