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); 220