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_clock = sdhci_set_clock,
42 .set_bus_width = sdhci_set_bus_width,
44 .set_uhs_signaling = sdhci_set_uhs_signaling,
47 static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
49 struct device_node *np = pdev->dev.of_node;
50 struct sdhci_plat_data *pdata = NULL;
53 cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
54 if (!gpio_is_valid(cd_gpio))
57 /* If pdata is required */
59 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
61 dev_err(&pdev->dev, "DT: kzalloc failed\n");
63 pdata->card_int_gpio = cd_gpio;
69 static int sdhci_probe(struct platform_device *pdev)
71 struct sdhci_host *host;
72 struct resource *iomem;
73 struct spear_sdhci *sdhci;
77 dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
78 host = sdhci_alloc_host(dev, sizeof(*sdhci));
81 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
85 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
86 host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
87 if (IS_ERR(host->ioaddr)) {
88 ret = PTR_ERR(host->ioaddr);
89 dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
93 host->hw_name = "sdhci";
94 host->ops = &sdhci_pltfm_ops;
95 host->irq = platform_get_irq(pdev, 0);
96 host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
98 sdhci = sdhci_priv(host);
101 sdhci->clk = devm_clk_get(&pdev->dev, NULL);
102 if (IS_ERR(sdhci->clk)) {
103 ret = PTR_ERR(sdhci->clk);
104 dev_dbg(&pdev->dev, "Error getting clock\n");
108 ret = clk_prepare_enable(sdhci->clk);
110 dev_dbg(&pdev->dev, "Error enabling clock\n");
114 ret = clk_set_rate(sdhci->clk, 50000000);
116 dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
117 clk_get_rate(sdhci->clk));
119 sdhci->data = sdhci_probe_config_dt(pdev);
120 if (IS_ERR(sdhci->data)) {
121 dev_err(&pdev->dev, "DT: Failed to get pdata\n");
126 * It is optional to use GPIOs for sdhci card detection. If
127 * sdhci->data is NULL, then use original sdhci lines otherwise
128 * GPIO lines. We use the built-in GPIO support for this.
130 if (sdhci->data && sdhci->data->card_int_gpio >= 0) {
131 ret = mmc_gpio_request_cd(host->mmc,
132 sdhci->data->card_int_gpio, 0);
135 "failed to request card-detect gpio%d\n",
136 sdhci->data->card_int_gpio);
141 ret = sdhci_add_host(host);
143 dev_dbg(&pdev->dev, "error adding host\n");
147 platform_set_drvdata(pdev, host);
152 clk_disable_unprepare(sdhci->clk);
154 sdhci_free_host(host);
156 dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
160 static int sdhci_remove(struct platform_device *pdev)
162 struct sdhci_host *host = platform_get_drvdata(pdev);
163 struct spear_sdhci *sdhci = sdhci_priv(host);
167 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
168 if (scratch == (u32)-1)
171 sdhci_remove_host(host, dead);
172 clk_disable_unprepare(sdhci->clk);
173 sdhci_free_host(host);
178 #ifdef CONFIG_PM_SLEEP
179 static int sdhci_suspend(struct device *dev)
181 struct sdhci_host *host = dev_get_drvdata(dev);
182 struct spear_sdhci *sdhci = sdhci_priv(host);
185 ret = sdhci_suspend_host(host);
187 clk_disable(sdhci->clk);
192 static int sdhci_resume(struct device *dev)
194 struct sdhci_host *host = dev_get_drvdata(dev);
195 struct spear_sdhci *sdhci = sdhci_priv(host);
198 ret = clk_enable(sdhci->clk);
200 dev_dbg(dev, "Resume: Error enabling clock\n");
204 return sdhci_resume_host(host);
208 static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
211 static const struct of_device_id sdhci_spear_id_table[] = {
212 { .compatible = "st,spear300-sdhci" },
215 MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
218 static struct platform_driver sdhci_driver = {
222 .of_match_table = of_match_ptr(sdhci_spear_id_table),
224 .probe = sdhci_probe,
225 .remove = sdhci_remove,
228 module_platform_driver(sdhci_driver);
230 MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
231 MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
232 MODULE_LICENSE("GPL v2");