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>
24 #include <linux/of_gpio.h>
25 #include <linux/platform_device.h>
27 #include <linux/slab.h>
28 #include <linux/mmc/host.h>
29 #include <linux/mmc/sdhci-spear.h>
30 #include <linux/mmc/slot-gpio.h>
36 struct sdhci_plat_data *data;
40 static const struct sdhci_ops sdhci_pltfm_ops = {
41 .set_bus_width = sdhci_set_bus_width,
46 static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
48 struct device_node *np = pdev->dev.of_node;
49 struct sdhci_plat_data *pdata = NULL;
52 cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
53 if (!gpio_is_valid(cd_gpio))
56 /* If pdata is required */
58 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
60 dev_err(&pdev->dev, "DT: kzalloc failed\n");
62 pdata->card_int_gpio = cd_gpio;
68 static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
70 return ERR_PTR(-ENOSYS);
74 static int sdhci_probe(struct platform_device *pdev)
76 struct device_node *np = pdev->dev.of_node;
77 struct sdhci_host *host;
78 struct resource *iomem;
79 struct spear_sdhci *sdhci;
83 dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
84 host = sdhci_alloc_host(dev, sizeof(*sdhci));
87 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
91 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
92 host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
93 if (IS_ERR(host->ioaddr)) {
94 ret = PTR_ERR(host->ioaddr);
95 dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
99 host->hw_name = "sdhci";
100 host->ops = &sdhci_pltfm_ops;
101 host->irq = platform_get_irq(pdev, 0);
102 host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
104 sdhci = sdhci_priv(host);
107 sdhci->clk = devm_clk_get(&pdev->dev, NULL);
108 if (IS_ERR(sdhci->clk)) {
109 ret = PTR_ERR(sdhci->clk);
110 dev_dbg(&pdev->dev, "Error getting clock\n");
114 ret = clk_prepare_enable(sdhci->clk);
116 dev_dbg(&pdev->dev, "Error enabling clock\n");
120 ret = clk_set_rate(sdhci->clk, 50000000);
122 dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
123 clk_get_rate(sdhci->clk));
126 sdhci->data = sdhci_probe_config_dt(pdev);
127 if (IS_ERR(sdhci->data)) {
128 dev_err(&pdev->dev, "DT: Failed to get pdata\n");
132 sdhci->data = dev_get_platdata(&pdev->dev);
136 * It is optional to use GPIOs for sdhci card detection. If
137 * sdhci->data is NULL, then use original sdhci lines otherwise
138 * GPIO lines. We use the built-in GPIO support for this.
140 if (sdhci->data && sdhci->data->card_int_gpio >= 0) {
141 ret = mmc_gpio_request_cd(host->mmc,
142 sdhci->data->card_int_gpio, 0);
145 "failed to request card-detect gpio%d\n",
146 sdhci->data->card_int_gpio);
151 ret = sdhci_add_host(host);
153 dev_dbg(&pdev->dev, "error adding host\n");
157 platform_set_drvdata(pdev, host);
162 clk_disable_unprepare(sdhci->clk);
164 sdhci_free_host(host);
166 dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
170 static int sdhci_remove(struct platform_device *pdev)
172 struct sdhci_host *host = platform_get_drvdata(pdev);
173 struct spear_sdhci *sdhci = sdhci_priv(host);
177 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
178 if (scratch == (u32)-1)
181 sdhci_remove_host(host, dead);
182 clk_disable_unprepare(sdhci->clk);
183 sdhci_free_host(host);
188 #ifdef CONFIG_PM_SLEEP
189 static int sdhci_suspend(struct device *dev)
191 struct sdhci_host *host = dev_get_drvdata(dev);
192 struct spear_sdhci *sdhci = sdhci_priv(host);
195 ret = sdhci_suspend_host(host);
197 clk_disable(sdhci->clk);
202 static int sdhci_resume(struct device *dev)
204 struct sdhci_host *host = dev_get_drvdata(dev);
205 struct spear_sdhci *sdhci = sdhci_priv(host);
208 ret = clk_enable(sdhci->clk);
210 dev_dbg(dev, "Resume: Error enabling clock\n");
214 return sdhci_resume_host(host);
218 static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
221 static const struct of_device_id sdhci_spear_id_table[] = {
222 { .compatible = "st,spear300-sdhci" },
225 MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
228 static struct platform_driver sdhci_driver = {
231 .owner = THIS_MODULE,
233 .of_match_table = of_match_ptr(sdhci_spear_id_table),
235 .probe = sdhci_probe,
236 .remove = sdhci_remove,
239 module_platform_driver(sdhci_driver);
241 MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
242 MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
243 MODULE_LICENSE("GPL v2");