1 /* 2 * Generic platform ehci driver 3 * 4 * Copyright 2007 Steven Brown <sbrown@cortland.com> 5 * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de> 6 * 7 * Derived from the ohci-ssb driver 8 * Copyright 2007 Michael Buesch <m@bues.ch> 9 * 10 * Derived from the EHCI-PCI driver 11 * Copyright (c) 2000-2004 by David Brownell 12 * 13 * Derived from the ohci-pci driver 14 * Copyright 1999 Roman Weissgaerber 15 * Copyright 2000-2002 David Brownell 16 * Copyright 1999 Linus Torvalds 17 * Copyright 1999 Gregory P. Smith 18 * 19 * Licensed under the GNU/GPL. See COPYING for details. 20 */ 21 #include <linux/dma-mapping.h> 22 #include <linux/err.h> 23 #include <linux/kernel.h> 24 #include <linux/hrtimer.h> 25 #include <linux/io.h> 26 #include <linux/module.h> 27 #include <linux/of.h> 28 #include <linux/platform_device.h> 29 #include <linux/usb.h> 30 #include <linux/usb/hcd.h> 31 #include <linux/usb/ehci_pdriver.h> 32 33 #include "ehci.h" 34 35 #define DRIVER_DESC "EHCI generic platform driver" 36 37 static const char hcd_name[] = "ehci-platform"; 38 39 static int ehci_platform_reset(struct usb_hcd *hcd) 40 { 41 struct platform_device *pdev = to_platform_device(hcd->self.controller); 42 struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev); 43 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 44 int retval; 45 46 hcd->has_tt = pdata->has_tt; 47 ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug; 48 ehci->big_endian_desc = pdata->big_endian_desc; 49 ehci->big_endian_mmio = pdata->big_endian_mmio; 50 51 if (pdata->pre_setup) { 52 retval = pdata->pre_setup(hcd); 53 if (retval < 0) 54 return retval; 55 } 56 57 ehci->caps = hcd->regs + pdata->caps_offset; 58 retval = ehci_setup(hcd); 59 if (retval) 60 return retval; 61 62 if (pdata->no_io_watchdog) 63 ehci->need_io_watchdog = 0; 64 return 0; 65 } 66 67 static struct hc_driver __read_mostly ehci_platform_hc_driver; 68 69 static const struct ehci_driver_overrides platform_overrides __initconst = { 70 .reset = ehci_platform_reset, 71 }; 72 73 static struct usb_ehci_pdata ehci_platform_defaults; 74 75 static int ehci_platform_probe(struct platform_device *dev) 76 { 77 struct usb_hcd *hcd; 78 struct resource *res_mem; 79 struct usb_ehci_pdata *pdata; 80 int irq; 81 int err = -ENOMEM; 82 83 if (usb_disabled()) 84 return -ENODEV; 85 86 /* 87 * use reasonable defaults so platforms don't have to provide these. 88 * with DT probing on ARM, none of these are set. 89 */ 90 if (!dev_get_platdata(&dev->dev)) 91 dev->dev.platform_data = &ehci_platform_defaults; 92 if (!dev->dev.dma_mask) 93 dev->dev.dma_mask = &dev->dev.coherent_dma_mask; 94 if (!dev->dev.coherent_dma_mask) 95 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 96 97 pdata = dev_get_platdata(&dev->dev); 98 99 irq = platform_get_irq(dev, 0); 100 if (irq < 0) { 101 dev_err(&dev->dev, "no irq provided"); 102 return irq; 103 } 104 res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0); 105 if (!res_mem) { 106 dev_err(&dev->dev, "no memory resource provided"); 107 return -ENXIO; 108 } 109 110 if (pdata->power_on) { 111 err = pdata->power_on(dev); 112 if (err < 0) 113 return err; 114 } 115 116 hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev, 117 dev_name(&dev->dev)); 118 if (!hcd) { 119 err = -ENOMEM; 120 goto err_power; 121 } 122 123 hcd->rsrc_start = res_mem->start; 124 hcd->rsrc_len = resource_size(res_mem); 125 126 hcd->regs = devm_ioremap_resource(&dev->dev, res_mem); 127 if (IS_ERR(hcd->regs)) { 128 err = PTR_ERR(hcd->regs); 129 goto err_put_hcd; 130 } 131 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 132 if (err) 133 goto err_put_hcd; 134 135 platform_set_drvdata(dev, hcd); 136 137 return err; 138 139 err_put_hcd: 140 usb_put_hcd(hcd); 141 err_power: 142 if (pdata->power_off) 143 pdata->power_off(dev); 144 145 return err; 146 } 147 148 static int ehci_platform_remove(struct platform_device *dev) 149 { 150 struct usb_hcd *hcd = platform_get_drvdata(dev); 151 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev); 152 153 usb_remove_hcd(hcd); 154 usb_put_hcd(hcd); 155 156 if (pdata->power_off) 157 pdata->power_off(dev); 158 159 if (pdata == &ehci_platform_defaults) 160 dev->dev.platform_data = NULL; 161 162 return 0; 163 } 164 165 #ifdef CONFIG_PM 166 167 static int ehci_platform_suspend(struct device *dev) 168 { 169 struct usb_hcd *hcd = dev_get_drvdata(dev); 170 struct usb_ehci_pdata *pdata = dev_get_platdata(dev); 171 struct platform_device *pdev = 172 container_of(dev, struct platform_device, dev); 173 bool do_wakeup = device_may_wakeup(dev); 174 int ret; 175 176 ret = ehci_suspend(hcd, do_wakeup); 177 178 if (pdata->power_suspend) 179 pdata->power_suspend(pdev); 180 181 return ret; 182 } 183 184 static int ehci_platform_resume(struct device *dev) 185 { 186 struct usb_hcd *hcd = dev_get_drvdata(dev); 187 struct usb_ehci_pdata *pdata = dev_get_platdata(dev); 188 struct platform_device *pdev = 189 container_of(dev, struct platform_device, dev); 190 191 if (pdata->power_on) { 192 int err = pdata->power_on(pdev); 193 if (err < 0) 194 return err; 195 } 196 197 ehci_resume(hcd, false); 198 return 0; 199 } 200 201 #else /* !CONFIG_PM */ 202 #define ehci_platform_suspend NULL 203 #define ehci_platform_resume NULL 204 #endif /* CONFIG_PM */ 205 206 static const struct of_device_id vt8500_ehci_ids[] = { 207 { .compatible = "via,vt8500-ehci", }, 208 { .compatible = "wm,prizm-ehci", }, 209 {} 210 }; 211 212 static const struct platform_device_id ehci_platform_table[] = { 213 { "ehci-platform", 0 }, 214 { } 215 }; 216 MODULE_DEVICE_TABLE(platform, ehci_platform_table); 217 218 static const struct dev_pm_ops ehci_platform_pm_ops = { 219 .suspend = ehci_platform_suspend, 220 .resume = ehci_platform_resume, 221 }; 222 223 static struct platform_driver ehci_platform_driver = { 224 .id_table = ehci_platform_table, 225 .probe = ehci_platform_probe, 226 .remove = ehci_platform_remove, 227 .shutdown = usb_hcd_platform_shutdown, 228 .driver = { 229 .owner = THIS_MODULE, 230 .name = "ehci-platform", 231 .pm = &ehci_platform_pm_ops, 232 .of_match_table = vt8500_ehci_ids, 233 } 234 }; 235 236 static int __init ehci_platform_init(void) 237 { 238 if (usb_disabled()) 239 return -ENODEV; 240 241 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 242 243 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides); 244 return platform_driver_register(&ehci_platform_driver); 245 } 246 module_init(ehci_platform_init); 247 248 static void __exit ehci_platform_cleanup(void) 249 { 250 platform_driver_unregister(&ehci_platform_driver); 251 } 252 module_exit(ehci_platform_cleanup); 253 254 MODULE_DESCRIPTION(DRIVER_DESC); 255 MODULE_AUTHOR("Hauke Mehrtens"); 256 MODULE_AUTHOR("Alan Stern"); 257 MODULE_LICENSE("GPL"); 258