Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / mmc / host / sdhci-spear.c
1 /*
2 * drivers/mmc/host/sdhci-spear.c
3 *
4 * Support of SDHCI platform devices for spear soc family
5 *
6 * Copyright (C) 2010 ST Microelectronics
7 * Viresh Kumar <viresh.linux@gmail.com>
8 *
9 * Inspired by sdhci-pltfm.c
10 *
11 * This file is licensed under the terms of the GNU General Public
12 * License version 2. This program is licensed "as is" without any
13 * warranty of any kind, whether express or implied.
14 */
15
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/platform_device.h>
24 #include <linux/pm.h>
25 #include <linux/slab.h>
26 #include <linux/mmc/host.h>
27 #include <linux/mmc/sdhci-spear.h>
28 #include <linux/io.h>
29 #include "sdhci.h"
30
31 struct spear_sdhci {
32 struct clk *clk;
33 struct sdhci_plat_data *data;
34 };
35
36 /* sdhci ops */
37 static struct sdhci_ops sdhci_pltfm_ops = {
38 /* Nothing to do for now. */
39 };
40
41 /* gpio card detection interrupt handler */
42 static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
43 {
44 struct platform_device *pdev = dev_id;
45 struct sdhci_host *host = platform_get_drvdata(pdev);
46 struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
47 unsigned long gpio_irq_type;
48 int val;
49
50 val = gpio_get_value(sdhci->data->card_int_gpio);
51
52 /* val == 1 -> card removed, val == 0 -> card inserted */
53 /* if card removed - set irq for low level, else vice versa */
54 gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
55 irq_set_irq_type(irq, gpio_irq_type);
56
57 if (sdhci->data->card_power_gpio >= 0) {
58 if (!sdhci->data->power_always_enb) {
59 /* if card inserted, give power, otherwise remove it */
60 val = sdhci->data->power_active_high ? !val : val ;
61 gpio_set_value(sdhci->data->card_power_gpio, val);
62 }
63 }
64
65 /* inform sdhci driver about card insertion/removal */
66 tasklet_schedule(&host->card_tasklet);
67
68 return IRQ_HANDLED;
69 }
70
71 static int __devinit sdhci_probe(struct platform_device *pdev)
72 {
73 struct sdhci_host *host;
74 struct resource *iomem;
75 struct spear_sdhci *sdhci;
76 int ret;
77
78 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
79 if (!iomem) {
80 ret = -ENOMEM;
81 dev_dbg(&pdev->dev, "memory resource not defined\n");
82 goto err;
83 }
84
85 if (!devm_request_mem_region(&pdev->dev, iomem->start,
86 resource_size(iomem), "spear-sdhci")) {
87 ret = -EBUSY;
88 dev_dbg(&pdev->dev, "cannot request region\n");
89 goto err;
90 }
91
92 sdhci = devm_kzalloc(&pdev->dev, sizeof(*sdhci), GFP_KERNEL);
93 if (!sdhci) {
94 ret = -ENOMEM;
95 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
96 goto err;
97 }
98
99 /* clk enable */
100 sdhci->clk = clk_get(&pdev->dev, NULL);
101 if (IS_ERR(sdhci->clk)) {
102 ret = PTR_ERR(sdhci->clk);
103 dev_dbg(&pdev->dev, "Error getting clock\n");
104 goto err;
105 }
106
107 ret = clk_enable(sdhci->clk);
108 if (ret) {
109 dev_dbg(&pdev->dev, "Error enabling clock\n");
110 goto put_clk;
111 }
112
113 /* overwrite platform_data */
114 sdhci->data = dev_get_platdata(&pdev->dev);
115 pdev->dev.platform_data = sdhci;
116
117 if (pdev->dev.parent)
118 host = sdhci_alloc_host(pdev->dev.parent, 0);
119 else
120 host = sdhci_alloc_host(&pdev->dev, 0);
121
122 if (IS_ERR(host)) {
123 ret = PTR_ERR(host);
124 dev_dbg(&pdev->dev, "error allocating host\n");
125 goto disable_clk;
126 }
127
128 host->hw_name = "sdhci";
129 host->ops = &sdhci_pltfm_ops;
130 host->irq = platform_get_irq(pdev, 0);
131 host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
132
133 host->ioaddr = devm_ioremap(&pdev->dev, iomem->start,
134 resource_size(iomem));
135 if (!host->ioaddr) {
136 ret = -ENOMEM;
137 dev_dbg(&pdev->dev, "failed to remap registers\n");
138 goto free_host;
139 }
140
141 ret = sdhci_add_host(host);
142 if (ret) {
143 dev_dbg(&pdev->dev, "error adding host\n");
144 goto free_host;
145 }
146
147 platform_set_drvdata(pdev, host);
148
149 /*
150 * It is optional to use GPIOs for sdhci Power control & sdhci card
151 * interrupt detection. If sdhci->data is NULL, then use original sdhci
152 * lines otherwise GPIO lines.
153 * If GPIO is selected for power control, then power should be disabled
154 * after card removal and should be enabled when card insertion
155 * interrupt occurs
156 */
157 if (!sdhci->data)
158 return 0;
159
160 if (sdhci->data->card_power_gpio >= 0) {
161 int val = 0;
162
163 ret = devm_gpio_request(&pdev->dev,
164 sdhci->data->card_power_gpio, "sdhci");
165 if (ret < 0) {
166 dev_dbg(&pdev->dev, "gpio request fail: %d\n",
167 sdhci->data->card_power_gpio);
168 goto set_drvdata;
169 }
170
171 if (sdhci->data->power_always_enb)
172 val = sdhci->data->power_active_high;
173 else
174 val = !sdhci->data->power_active_high;
175
176 ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
177 if (ret) {
178 dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
179 sdhci->data->card_power_gpio);
180 goto set_drvdata;
181 }
182 }
183
184 if (sdhci->data->card_int_gpio >= 0) {
185 ret = devm_gpio_request(&pdev->dev, sdhci->data->card_int_gpio,
186 "sdhci");
187 if (ret < 0) {
188 dev_dbg(&pdev->dev, "gpio request fail: %d\n",
189 sdhci->data->card_int_gpio);
190 goto set_drvdata;
191 }
192
193 ret = gpio_direction_input(sdhci->data->card_int_gpio);
194 if (ret) {
195 dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
196 sdhci->data->card_int_gpio);
197 goto set_drvdata;
198 }
199 ret = devm_request_irq(&pdev->dev,
200 gpio_to_irq(sdhci->data->card_int_gpio),
201 sdhci_gpio_irq, IRQF_TRIGGER_LOW,
202 mmc_hostname(host->mmc), pdev);
203 if (ret) {
204 dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
205 sdhci->data->card_int_gpio);
206 goto set_drvdata;
207 }
208
209 }
210
211 return 0;
212
213 set_drvdata:
214 platform_set_drvdata(pdev, NULL);
215 sdhci_remove_host(host, 1);
216 free_host:
217 sdhci_free_host(host);
218 disable_clk:
219 clk_disable(sdhci->clk);
220 put_clk:
221 clk_put(sdhci->clk);
222 err:
223 dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
224 return ret;
225 }
226
227 static int __devexit sdhci_remove(struct platform_device *pdev)
228 {
229 struct sdhci_host *host = platform_get_drvdata(pdev);
230 struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
231 int dead = 0;
232 u32 scratch;
233
234 platform_set_drvdata(pdev, NULL);
235 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
236 if (scratch == (u32)-1)
237 dead = 1;
238
239 sdhci_remove_host(host, dead);
240 sdhci_free_host(host);
241 clk_disable(sdhci->clk);
242 clk_put(sdhci->clk);
243
244 return 0;
245 }
246
247 #ifdef CONFIG_PM
248 static int sdhci_suspend(struct device *dev)
249 {
250 struct sdhci_host *host = dev_get_drvdata(dev);
251 struct spear_sdhci *sdhci = dev_get_platdata(dev);
252 int ret;
253
254 ret = sdhci_suspend_host(host);
255 if (!ret)
256 clk_disable(sdhci->clk);
257
258 return ret;
259 }
260
261 static int sdhci_resume(struct device *dev)
262 {
263 struct sdhci_host *host = dev_get_drvdata(dev);
264 struct spear_sdhci *sdhci = dev_get_platdata(dev);
265 int ret;
266
267 ret = clk_enable(sdhci->clk);
268 if (ret) {
269 dev_dbg(dev, "Resume: Error enabling clock\n");
270 return ret;
271 }
272
273 return sdhci_resume_host(host);
274 }
275 #endif
276
277 static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
278
279 static struct platform_driver sdhci_driver = {
280 .driver = {
281 .name = "sdhci",
282 .owner = THIS_MODULE,
283 .pm = &sdhci_pm_ops,
284 },
285 .probe = sdhci_probe,
286 .remove = __devexit_p(sdhci_remove),
287 };
288
289 module_platform_driver(sdhci_driver);
290
291 MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
292 MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
293 MODULE_LICENSE("GPL v2");
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