drivers/usb/dwc3/dwc3-pci.c

   1 /**
   2  * dwc3-pci.c - PCI Specific glue layer
   3  *
   4  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Authors: Felipe Balbi <balbi@ti.com>,
   7  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions, and the following disclaimer,
  14  *    without modification.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. The names of the above-listed copyright holders may not be used
  19  *    to endorse or promote products derived from this software without
  20  *    specific prior written permission.
  21  *
  22  * ALTERNATIVELY, this software may be distributed under the terms of the
  23  * GNU General Public License ("GPL") version 2, as published by the Free
  24  * Software Foundation.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  27  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  28  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  29  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  30  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  31  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  32  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  33  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  34  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  35  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  36  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #include <linux/kernel.h>
  40 #include <linux/module.h>
  41 #include <linux/slab.h>
  42 #include <linux/pci.h>
  43 #include <linux/platform_device.h>
  44
  45 /* FIXME define these in <linux/pci_ids.h> */
  46 #define PCI_VENDOR_ID_SYNOPSYS          0x16c3
  47 #define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3 0xabcd
  48
  49 #define DWC3_PCI_DEVS_POSSIBLE  32
  50
  51 struct dwc3_pci {
  52         struct device           *dev;
  53         struct platform_device  *dwc3;
  54 };
  55
  56 static DECLARE_BITMAP(dwc3_pci_devs, DWC3_PCI_DEVS_POSSIBLE);
  57
  58 static int dwc3_pci_get_device_id(struct dwc3_pci *glue)
  59 {
  60         int             id;
  61
  62 again:
  63         id = find_first_zero_bit(dwc3_pci_devs, DWC3_PCI_DEVS_POSSIBLE);
  64         if (id < DWC3_PCI_DEVS_POSSIBLE) {
  65                 int old;
  66
  67                 old = test_and_set_bit(id, dwc3_pci_devs);
  68                 if (old)
  69                         goto again;
  70         } else {
  71                 dev_err(glue->dev, "no space for new device\n");
  72                 id = -ENOMEM;
  73         }
  74
  75         return 0;
  76 }
  77
  78 static void dwc3_pci_put_device_id(struct dwc3_pci *glue, int id)
  79 {
  80         int                     ret;
  81
  82         if (id < 0)
  83                 return;
  84
  85         ret = test_bit(id, dwc3_pci_devs);
  86         WARN(!ret, "Device: %s\nID %d not in use\n",
  87                         dev_driver_string(glue->dev), id);
  88         clear_bit(id, dwc3_pci_devs);
  89 }
  90
  91 static int __devinit dwc3_pci_probe(struct pci_dev *pci,
  92                 const struct pci_device_id *id)
  93 {
  94         struct resource         res[2];
  95         struct platform_device  *dwc3;
  96         struct dwc3_pci         *glue;
  97         int                     ret = -ENOMEM;
  98         int                     devid;
  99
 100         glue = kzalloc(sizeof(*glue), GFP_KERNEL);
 101         if (!glue) {
 102                 dev_err(&pci->dev, "not enough memory\n");
 103                 goto err0;
 104         }
 105
 106         glue->dev       = &pci->dev;
 107
 108         ret = pci_enable_device(pci);
 109         if (ret) {
 110                 dev_err(&pci->dev, "failed to enable pci device\n");
 111                 goto err1;
 112         }
 113
 114         pci_set_power_state(pci, PCI_D0);
 115         pci_set_master(pci);
 116
 117         devid = dwc3_pci_get_device_id(glue);
 118         if (devid < 0)
 119                 goto err2;
 120
 121         dwc3 = platform_device_alloc("dwc3-pci", devid);
 122         if (!dwc3) {
 123                 dev_err(&pci->dev, "couldn't allocate dwc3 device\n");
 124                 goto err3;
 125         }
 126
 127         memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
 128
 129         res[0].start    = pci_resource_start(pci, 0);
 130         res[0].end      = pci_resource_end(pci, 0);
 131         res[0].name     = "dwc_usb3";
 132         res[0].flags    = IORESOURCE_MEM;
 133
 134         res[1].start    = pci->irq;
 135         res[1].name     = "dwc_usb3";
 136         res[1].flags    = IORESOURCE_IRQ;
 137
 138         ret = platform_device_add_resources(dwc3, res, ARRAY_SIZE(res));
 139         if (ret) {
 140                 dev_err(&pci->dev, "couldn't add resources to dwc3 device\n");
 141                 goto err4;
 142         }
 143
 144         pci_set_drvdata(pci, glue);
 145
 146         dma_set_coherent_mask(&dwc3->dev, pci->dev.coherent_dma_mask);
 147
 148         dwc3->dev.dma_mask = pci->dev.dma_mask;
 149         dwc3->dev.dma_parms = pci->dev.dma_parms;
 150         dwc3->dev.parent = &pci->dev;
 151         glue->dwc3      = dwc3;
 152
 153         ret = platform_device_add(dwc3);
 154         if (ret) {
 155                 dev_err(&pci->dev, "failed to register dwc3 device\n");
 156                 goto err4;
 157         }
 158
 159         return 0;
 160
 161 err4:
 162         pci_set_drvdata(pci, NULL);
 163         platform_device_put(dwc3);
 164
 165 err3:
 166         dwc3_pci_put_device_id(glue, devid);
 167
 168 err2:
 169         pci_disable_device(pci);
 170
 171 err1:
 172         kfree(pci);
 173
 174 err0:
 175         return ret;
 176 }
 177
 178 static void __devexit dwc3_pci_remove(struct pci_dev *pci)
 179 {
 180         struct dwc3_pci *glue = pci_get_drvdata(pci);
 181
 182         dwc3_pci_put_device_id(glue, glue->dwc3->id);
 183         platform_device_unregister(glue->dwc3);
 184         pci_set_drvdata(pci, NULL);
 185         pci_disable_device(pci);
 186         kfree(glue);
 187 }
 188
 189 static DEFINE_PCI_DEVICE_TABLE(dwc3_pci_id_table) = {
 190         {
 191                 PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
 192                                 PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3),
 193         },
 194         {  }    /* Terminating Entry */
 195 };
 196 MODULE_DEVICE_TABLE(pci, dwc3_pci_id_table);
 197
 198 static struct pci_driver dwc3_pci_driver = {
 199         .name           = "pci-dwc3",
 200         .id_table       = dwc3_pci_id_table,
 201         .probe          = dwc3_pci_probe,
 202         .remove         = __devexit_p(dwc3_pci_remove),
 203 };
 204
 205 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 206 MODULE_LICENSE("Dual BSD/GPL");
 207 MODULE_DESCRIPTION("DesignWare USB3 PCI Glue Layer");
 208
 209 static int __devinit dwc3_pci_init(void)
 210 {
 211         return pci_register_driver(&dwc3_pci_driver);
 212 }
 213 module_init(dwc3_pci_init);
 214
 215 static void __exit dwc3_pci_exit(void)
 216 {
 217         pci_unregister_driver(&dwc3_pci_driver);
 218 }
 219 module_exit(dwc3_pci_exit);