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.kumar@st.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/interrupt.h>
21 #include <linux/irq.h>
22 #include <linux/platform_device.h>
23 #include <linux/slab.h>
24 #include <linux/mmc/host.h>
25 #include <linux/mmc/sdhci-spear.h>
31 struct sdhci_plat_data *data;
35 static struct sdhci_ops sdhci_pltfm_ops = {
36 /* Nothing to do for now. */
39 /* gpio card detection interrupt handler */
40 static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
42 struct platform_device *pdev = dev_id;
43 struct sdhci_host *host = platform_get_drvdata(pdev);
44 struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
45 unsigned long gpio_irq_type;
48 val = gpio_get_value(sdhci->data->card_int_gpio);
50 /* val == 1 -> card removed, val == 0 -> card inserted */
51 /* if card removed - set irq for low level, else vice versa */
52 gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
53 set_irq_type(irq, gpio_irq_type);
55 if (sdhci->data->card_power_gpio >= 0) {
56 if (!sdhci->data->power_always_enb) {
57 /* if card inserted, give power, otherwise remove it */
58 val = sdhci->data->power_active_high ? !val : val ;
59 gpio_set_value(sdhci->data->card_power_gpio, val);
63 /* inform sdhci driver about card insertion/removal */
64 tasklet_schedule(&host->card_tasklet);
69 static int __devinit sdhci_probe(struct platform_device *pdev)
71 struct sdhci_host *host;
72 struct resource *iomem;
73 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 (!request_mem_region(iomem->start, resource_size(iomem),
88 dev_dbg(&pdev->dev, "cannot request region\n");
92 sdhci = kzalloc(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 = ioremap(iomem->start, resource_size(iomem));
136 dev_dbg(&pdev->dev, "failed to remap registers\n");
140 ret = sdhci_add_host(host);
142 dev_dbg(&pdev->dev, "error adding host\n");
146 platform_set_drvdata(pdev, host);
149 * It is optional to use GPIOs for sdhci Power control & sdhci card
150 * interrupt detection. If sdhci->data is NULL, then use original sdhci
151 * lines otherwise GPIO lines.
152 * If GPIO is selected for power control, then power should be disabled
153 * after card removal and should be enabled when card insertion
159 if (sdhci->data->card_power_gpio >= 0) {
162 ret = gpio_request(sdhci->data->card_power_gpio, "sdhci");
164 dev_dbg(&pdev->dev, "gpio request fail: %d\n",
165 sdhci->data->card_power_gpio);
166 goto err_pgpio_request;
169 if (sdhci->data->power_always_enb)
170 val = sdhci->data->power_active_high;
172 val = !sdhci->data->power_active_high;
174 ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
176 dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
177 sdhci->data->card_power_gpio);
178 goto err_pgpio_direction;
181 gpio_set_value(sdhci->data->card_power_gpio, 1);
184 if (sdhci->data->card_int_gpio >= 0) {
185 ret = gpio_request(sdhci->data->card_int_gpio, "sdhci");
187 dev_dbg(&pdev->dev, "gpio request fail: %d\n",
188 sdhci->data->card_int_gpio);
189 goto err_igpio_request;
192 ret = gpio_direction_input(sdhci->data->card_int_gpio);
194 dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
195 sdhci->data->card_int_gpio);
196 goto err_igpio_direction;
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);
202 dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
203 sdhci->data->card_int_gpio);
204 goto err_igpio_request_irq;
211 err_igpio_request_irq:
213 if (sdhci->data->card_int_gpio >= 0)
214 gpio_free(sdhci->data->card_int_gpio);
217 if (sdhci->data->card_power_gpio >= 0)
218 gpio_free(sdhci->data->card_power_gpio);
220 platform_set_drvdata(pdev, NULL);
221 sdhci_remove_host(host, 1);
223 iounmap(host->ioaddr);
225 sdhci_free_host(host);
227 clk_disable(sdhci->clk);
233 release_mem_region(iomem->start, resource_size(iomem));
235 dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
239 static int __devexit sdhci_remove(struct platform_device *pdev)
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);
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);
253 if (sdhci->data->card_power_gpio >= 0)
254 gpio_free(sdhci->data->card_power_gpio);
257 platform_set_drvdata(pdev, NULL);
259 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
260 if (scratch == (u32)-1)
263 sdhci_remove_host(host, dead);
264 iounmap(host->ioaddr);
265 sdhci_free_host(host);
266 clk_disable(sdhci->clk);
270 release_mem_region(iomem->start, resource_size(iomem));
275 static struct platform_driver sdhci_driver = {
278 .owner = THIS_MODULE,
280 .probe = sdhci_probe,
281 .remove = __devexit_p(sdhci_remove),
284 static int __init sdhci_init(void)
286 return platform_driver_register(&sdhci_driver);
288 module_init(sdhci_init);
290 static void __exit sdhci_exit(void)
292 platform_driver_unregister(&sdhci_driver);
294 module_exit(sdhci_exit);
296 MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
297 MODULE_AUTHOR("Viresh Kumar <viresh.kumar@st.com>");
298 MODULE_LICENSE("GPL v2");