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.kumar@st.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
31struct spear_sdhci {
32	struct clk *clk;
33	struct sdhci_plat_data *data;
34};
35
36/* sdhci ops */
37static struct sdhci_ops sdhci_pltfm_ops = {
38	/* Nothing to do for now. */
39};
40
41/* gpio card detection interrupt handler */
42static 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
71static 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	BUG_ON(pdev == NULL);
79
80	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
81	if (!iomem) {
82		ret = -ENOMEM;
83		dev_dbg(&pdev->dev, "memory resource not defined\n");
84		goto err;
85	}
86
87	if (!request_mem_region(iomem->start, resource_size(iomem),
88				"spear-sdhci")) {
89		ret = -EBUSY;
90		dev_dbg(&pdev->dev, "cannot request region\n");
91		goto err;
92	}
93
94	sdhci = kzalloc(sizeof(*sdhci), GFP_KERNEL);
95	if (!sdhci) {
96		ret = -ENOMEM;
97		dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
98		goto err_kzalloc;
99	}
100
101	/* clk enable */
102	sdhci->clk = clk_get(&pdev->dev, NULL);
103	if (IS_ERR(sdhci->clk)) {
104		ret = PTR_ERR(sdhci->clk);
105		dev_dbg(&pdev->dev, "Error getting clock\n");
106		goto err_clk_get;
107	}
108
109	ret = clk_enable(sdhci->clk);
110	if (ret) {
111		dev_dbg(&pdev->dev, "Error enabling clock\n");
112		goto err_clk_enb;
113	}
114
115	/* overwrite platform_data */
116	sdhci->data = dev_get_platdata(&pdev->dev);
117	pdev->dev.platform_data = sdhci;
118
119	if (pdev->dev.parent)
120		host = sdhci_alloc_host(pdev->dev.parent, 0);
121	else
122		host = sdhci_alloc_host(&pdev->dev, 0);
123
124	if (IS_ERR(host)) {
125		ret = PTR_ERR(host);
126		dev_dbg(&pdev->dev, "error allocating host\n");
127		goto err_alloc_host;
128	}
129
130	host->hw_name = "sdhci";
131	host->ops = &sdhci_pltfm_ops;
132	host->irq = platform_get_irq(pdev, 0);
133	host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
134
135	host->ioaddr = ioremap(iomem->start, resource_size(iomem));
136	if (!host->ioaddr) {
137		ret = -ENOMEM;
138		dev_dbg(&pdev->dev, "failed to remap registers\n");
139		goto err_ioremap;
140	}
141
142	ret = sdhci_add_host(host);
143	if (ret) {
144		dev_dbg(&pdev->dev, "error adding host\n");
145		goto err_add_host;
146	}
147
148	platform_set_drvdata(pdev, host);
149
150	/*
151	 * It is optional to use GPIOs for sdhci Power control & sdhci card
152	 * interrupt detection. If sdhci->data is NULL, then use original sdhci
153	 * lines otherwise GPIO lines.
154	 * If GPIO is selected for power control, then power should be disabled
155	 * after card removal and should be enabled when card insertion
156	 * interrupt occurs
157	 */
158	if (!sdhci->data)
159		return 0;
160
161	if (sdhci->data->card_power_gpio >= 0) {
162		int val = 0;
163
164		ret = gpio_request(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 err_pgpio_request;
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 err_pgpio_direction;
181		}
182	}
183
184	if (sdhci->data->card_int_gpio >= 0) {
185		ret = gpio_request(sdhci->data->card_int_gpio, "sdhci");
186		if (ret < 0) {
187			dev_dbg(&pdev->dev, "gpio request fail: %d\n",
188					sdhci->data->card_int_gpio);
189			goto err_igpio_request;
190		}
191
192		ret = gpio_direction_input(sdhci->data->card_int_gpio);
193		if (ret) {
194			dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
195					sdhci->data->card_int_gpio);
196			goto err_igpio_direction;
197		}
198		ret = request_irq(gpio_to_irq(sdhci->data->card_int_gpio),
199				sdhci_gpio_irq, IRQF_TRIGGER_LOW,
200				mmc_hostname(host->mmc), pdev);
201		if (ret) {
202			dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
203					sdhci->data->card_int_gpio);
204			goto err_igpio_request_irq;
205		}
206
207	}
208
209	return 0;
210
211err_igpio_request_irq:
212err_igpio_direction:
213	if (sdhci->data->card_int_gpio >= 0)
214		gpio_free(sdhci->data->card_int_gpio);
215err_igpio_request:
216err_pgpio_direction:
217	if (sdhci->data->card_power_gpio >= 0)
218		gpio_free(sdhci->data->card_power_gpio);
219err_pgpio_request:
220	platform_set_drvdata(pdev, NULL);
221	sdhci_remove_host(host, 1);
222err_add_host:
223	iounmap(host->ioaddr);
224err_ioremap:
225	sdhci_free_host(host);
226err_alloc_host:
227	clk_disable(sdhci->clk);
228err_clk_enb:
229	clk_put(sdhci->clk);
230err_clk_get:
231	kfree(sdhci);
232err_kzalloc:
233	release_mem_region(iomem->start, resource_size(iomem));
234err:
235	dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
236	return ret;
237}
238
239static int __devexit sdhci_remove(struct platform_device *pdev)
240{
241	struct sdhci_host *host = platform_get_drvdata(pdev);
242	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
243	struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
244	int dead;
245	u32 scratch;
246
247	if (sdhci->data) {
248		if (sdhci->data->card_int_gpio >= 0) {
249			free_irq(gpio_to_irq(sdhci->data->card_int_gpio), pdev);
250			gpio_free(sdhci->data->card_int_gpio);
251		}
252
253		if (sdhci->data->card_power_gpio >= 0)
254			gpio_free(sdhci->data->card_power_gpio);
255	}
256
257	platform_set_drvdata(pdev, NULL);
258	dead = 0;
259	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
260	if (scratch == (u32)-1)
261		dead = 1;
262
263	sdhci_remove_host(host, dead);
264	iounmap(host->ioaddr);
265	sdhci_free_host(host);
266	clk_disable(sdhci->clk);
267	clk_put(sdhci->clk);
268	kfree(sdhci);
269	if (iomem)
270		release_mem_region(iomem->start, resource_size(iomem));
271
272	return 0;
273}
274
275#ifdef CONFIG_PM
276static int sdhci_suspend(struct device *dev)
277{
278	struct sdhci_host *host = dev_get_drvdata(dev);
279	struct spear_sdhci *sdhci = dev_get_platdata(dev);
280	int ret;
281
282	ret = sdhci_suspend_host(host);
283	if (!ret)
284		clk_disable(sdhci->clk);
285
286	return ret;
287}
288
289static int sdhci_resume(struct device *dev)
290{
291	struct sdhci_host *host = dev_get_drvdata(dev);
292	struct spear_sdhci *sdhci = dev_get_platdata(dev);
293	int ret;
294
295	ret = clk_enable(sdhci->clk);
296	if (ret) {
297		dev_dbg(dev, "Resume: Error enabling clock\n");
298		return ret;
299	}
300
301	return sdhci_resume_host(host);
302}
303#endif
304
305static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
306
307static struct platform_driver sdhci_driver = {
308	.driver = {
309		.name	= "sdhci",
310		.owner	= THIS_MODULE,
311		.pm	= &sdhci_pm_ops,
312	},
313	.probe		= sdhci_probe,
314	.remove		= __devexit_p(sdhci_remove),
315};
316
317module_platform_driver(sdhci_driver);
318
319MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
320MODULE_AUTHOR("Viresh Kumar <viresh.kumar@st.com>");
321MODULE_LICENSE("GPL v2");
322