2 * platform.c - DesignWare HS OTG Controller platform driver
4 * Copyright (C) Matthijs Kooijman <matthijs@stdin.nl>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions, and the following disclaimer,
11 * without modification.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The names of the above-listed copyright holders may not be used
16 * to endorse or promote products derived from this software without
17 * specific prior written permission.
19 * ALTERNATIVELY, this software may be distributed under the terms of the
20 * GNU General Public License ("GPL") as published by the Free Software
21 * Foundation; either version 2 of the License, or (at your option) any
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
25 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
26 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
27 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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29 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
31 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 #include <linux/kernel.h>
38 #include <linux/module.h>
39 #include <linux/slab.h>
40 #include <linux/device.h>
41 #include <linux/dma-mapping.h>
42 #include <linux/platform_device.h>
47 static const char dwc2_driver_name[] = "dwc2";
50 * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
53 * @dev: Platform device
55 * This routine is called, for example, when the rmmod command is executed. The
56 * device may or may not be electrically present. If it is present, the driver
57 * stops device processing. Any resources used on behalf of this device are
60 static int dwc2_driver_remove(struct platform_device *dev)
62 struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
64 dwc2_hcd_remove(hsotg);
70 * dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
73 * @dev: Platform device
75 * This routine creates the driver components required to control the device
76 * (core, HCD, and PCD) and initializes the device. The driver components are
77 * stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved
78 * in the device private data. This allows the driver to access the dwc2_hsotg
79 * structure on subsequent calls to driver methods for this device.
81 static int dwc2_driver_probe(struct platform_device *dev)
83 struct dwc2_hsotg *hsotg;
87 struct dwc2_core_params params;
89 /* Default all params to autodetect */
90 dwc2_set_all_params(¶ms, -1);
92 hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
96 hsotg->dev = &dev->dev;
99 * Use reasonable defaults so platforms don't have to provide these.
101 if (!dev->dev.dma_mask)
102 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
103 if (!dev->dev.coherent_dma_mask)
104 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
106 irq = platform_get_irq(dev, 0);
108 dev_err(&dev->dev, "missing IRQ resource\n");
112 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
113 hsotg->regs = devm_ioremap_resource(&dev->dev, res);
114 if (IS_ERR(hsotg->regs))
115 return PTR_ERR(hsotg->regs);
117 dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
118 (unsigned long)res->start, hsotg->regs);
120 retval = dwc2_hcd_init(hsotg, irq, ¶ms);
124 platform_set_drvdata(dev, hsotg);
129 static const struct of_device_id dwc2_of_match_table[] = {
130 { .compatible = "snps,dwc2" },
133 MODULE_DEVICE_TABLE(of, dwc2_of_match_table);
135 static struct platform_driver dwc2_platform_driver = {
137 .name = (char *)dwc2_driver_name,
138 .of_match_table = dwc2_of_match_table,
140 .probe = dwc2_driver_probe,
141 .remove = dwc2_driver_remove,
144 module_platform_driver(dwc2_platform_driver);
146 MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
147 MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>");
148 MODULE_LICENSE("Dual BSD/GPL");