2 * drivers/mmc/host/sdhci-spear.c
4 * Support of SDHCI platform devices for spear soc family
6 * Copyright (C) 2010 ST Microelectronics
7 * Viresh Kumar <viresh.linux@gmail.com>
9 * Inspired by sdhci-pltfm.c
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.
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>
25 #include <linux/slab.h>
26 #include <linux/mmc/host.h>
27 #include <linux/mmc/sdhci-spear.h>
33 struct sdhci_plat_data *data;
37 static struct sdhci_ops sdhci_pltfm_ops = {
38 /* Nothing to do for now. */
41 /* gpio card detection interrupt handler */
42 static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
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;
50 val = gpio_get_value(sdhci->data->card_int_gpio);
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);
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);
65 /* inform sdhci driver about card insertion/removal */
66 tasklet_schedule(&host->card_tasklet);
71 static int __devinit sdhci_probe(struct platform_device *pdev)
73 struct sdhci_host *host;
74 struct resource *iomem;
75 struct spear_sdhci *sdhci;
78 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
81 dev_dbg(&pdev->dev, "memory resource not defined\n");
85 if (!devm_request_mem_region(&pdev->dev, iomem->start,
86 resource_size(iomem), "spear-sdhci")) {
88 dev_dbg(&pdev->dev, "cannot request region\n");
92 sdhci = devm_kzalloc(&pdev->dev, sizeof(*sdhci), GFP_KERNEL);
95 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
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");
107 ret = clk_enable(sdhci->clk);
109 dev_dbg(&pdev->dev, "Error enabling clock\n");
113 /* overwrite platform_data */
114 sdhci->data = dev_get_platdata(&pdev->dev);
115 pdev->dev.platform_data = sdhci;
117 if (pdev->dev.parent)
118 host = sdhci_alloc_host(pdev->dev.parent, 0);
120 host = sdhci_alloc_host(&pdev->dev, 0);
124 dev_dbg(&pdev->dev, "error allocating host\n");
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;
133 host->ioaddr = devm_ioremap(&pdev->dev, iomem->start,
134 resource_size(iomem));
137 dev_dbg(&pdev->dev, "failed to remap registers\n");
141 ret = sdhci_add_host(host);
143 dev_dbg(&pdev->dev, "error adding host\n");
147 platform_set_drvdata(pdev, host);
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
160 if (sdhci->data->card_power_gpio >= 0) {
163 ret = devm_gpio_request(&pdev->dev,
164 sdhci->data->card_power_gpio, "sdhci");
166 dev_dbg(&pdev->dev, "gpio request fail: %d\n",
167 sdhci->data->card_power_gpio);
171 if (sdhci->data->power_always_enb)
172 val = sdhci->data->power_active_high;
174 val = !sdhci->data->power_active_high;
176 ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
178 dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
179 sdhci->data->card_power_gpio);
184 if (sdhci->data->card_int_gpio >= 0) {
185 ret = devm_gpio_request(&pdev->dev, sdhci->data->card_int_gpio,
188 dev_dbg(&pdev->dev, "gpio request fail: %d\n",
189 sdhci->data->card_int_gpio);
193 ret = gpio_direction_input(sdhci->data->card_int_gpio);
195 dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
196 sdhci->data->card_int_gpio);
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);
204 dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
205 sdhci->data->card_int_gpio);
214 platform_set_drvdata(pdev, NULL);
215 sdhci_remove_host(host, 1);
217 sdhci_free_host(host);
219 clk_disable(sdhci->clk);
223 dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
227 static int __devexit sdhci_remove(struct platform_device *pdev)
229 struct sdhci_host *host = platform_get_drvdata(pdev);
230 struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
234 platform_set_drvdata(pdev, NULL);
235 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
236 if (scratch == (u32)-1)
239 sdhci_remove_host(host, dead);
240 sdhci_free_host(host);
241 clk_disable(sdhci->clk);
248 static int sdhci_suspend(struct device *dev)
250 struct sdhci_host *host = dev_get_drvdata(dev);
251 struct spear_sdhci *sdhci = dev_get_platdata(dev);
254 ret = sdhci_suspend_host(host);
256 clk_disable(sdhci->clk);
261 static int sdhci_resume(struct device *dev)
263 struct sdhci_host *host = dev_get_drvdata(dev);
264 struct spear_sdhci *sdhci = dev_get_platdata(dev);
267 ret = clk_enable(sdhci->clk);
269 dev_dbg(dev, "Resume: Error enabling clock\n");
273 return sdhci_resume_host(host);
277 static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
279 static struct platform_driver sdhci_driver = {
282 .owner = THIS_MODULE,
285 .probe = sdhci_probe,
286 .remove = __devexit_p(sdhci_remove),
289 module_platform_driver(sdhci_driver);
291 MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
292 MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
293 MODULE_LICENSE("GPL v2");