drivers/staging/dwc2/platform.c

   1 /*
   2  * platform.c - DesignWare HS OTG Controller platform driver
   3  *
   4  * Copyright (C) Matthijs Kooijman <matthijs@stdin.nl>
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   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.
  18  *
  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
  22  * later version.
  23  *
  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
  28  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  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
  32  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  33  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  34  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  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>
  43
  44 #include "core.h"
  45 #include "hcd.h"
  46
  47 static const char dwc2_driver_name[] = "dwc2";
  48
  49 /**
  50  * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
  51  * DWC_otg driver
  52  *
  53  * @dev: Platform device
  54  *
  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
  58  * freed.
  59  */
  60 static int dwc2_driver_remove(struct platform_device *dev)
  61 {
  62         struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
  63
  64         dwc2_hcd_remove(hsotg);
  65
  66         return 0;
  67 }
  68
  69 /**
  70  * dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
  71  * driver
  72  *
  73  * @dev: Platform device
  74  *
  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.
  80  */
  81 static int dwc2_driver_probe(struct platform_device *dev)
  82 {
  83         struct dwc2_hsotg *hsotg;
  84         struct resource *res;
  85         int retval;
  86         int irq;
  87         struct dwc2_core_params params;
  88
  89         /* Default all params to autodetect */
  90         dwc2_set_all_params(&params, -1);
  91
  92         hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
  93         if (!hsotg)
  94                 return -ENOMEM;
  95
  96         hsotg->dev = &dev->dev;
  97
  98         /*
  99          * Use reasonable defaults so platforms don't have to provide these.
 100          */
 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);
 105
 106         irq = platform_get_irq(dev, 0);
 107         if (irq < 0) {
 108                 dev_err(&dev->dev, "missing IRQ resource\n");
 109                 return -EINVAL;
 110         }
 111
 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);
 116
 117         dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
 118                 (unsigned long)res->start, hsotg->regs);
 119
 120         retval = dwc2_hcd_init(hsotg, irq, &params);
 121         if (retval)
 122                 return retval;
 123
 124         platform_set_drvdata(dev, hsotg);
 125
 126         return retval;
 127 }
 128
 129 static const struct of_device_id dwc2_of_match_table[] = {
 130         { .compatible = "snps,dwc2" },
 131         {},
 132 };
 133 MODULE_DEVICE_TABLE(of, dwc2_of_match_table);
 134
 135 static struct platform_driver dwc2_platform_driver = {
 136         .driver = {
 137                 .name = (char *)dwc2_driver_name,
 138                 .of_match_table = dwc2_of_match_table,
 139         },
 140         .probe = dwc2_driver_probe,
 141         .remove = dwc2_driver_remove,
 142 };
 143
 144 module_platform_driver(dwc2_platform_driver);
 145
 146 MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
 147 MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>");
 148 MODULE_LICENSE("Dual BSD/GPL");