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; 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 err = dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32)); 95 if (err) 96 return err; 97 98 pdata = dev_get_platdata(&dev->dev); 99 100 irq = platform_get_irq(dev, 0); 101 if (irq < 0) { 102 dev_err(&dev->dev, "no irq provided"); 103 return irq; 104 } 105 res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0); 106 if (!res_mem) { 107 dev_err(&dev->dev, "no memory resource provided"); 108 return -ENXIO; 109 } 110 111 if (pdata->power_on) { 112 err = pdata->power_on(dev); 113 if (err < 0) 114 return err; 115 } 116 117 hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev, 118 dev_name(&dev->dev)); 119 if (!hcd) { 120 err = -ENOMEM; 121 goto err_power; 122 } 123 124 hcd->rsrc_start = res_mem->start; 125 hcd->rsrc_len = resource_size(res_mem); 126 127 hcd->regs = devm_ioremap_resource(&dev->dev, res_mem); 128 if (IS_ERR(hcd->regs)) { 129 err = PTR_ERR(hcd->regs); 130 goto err_put_hcd; 131 } 132 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 133 if (err) 134 goto err_put_hcd; 135 136 platform_set_drvdata(dev, hcd); 137 138 return err; 139 140 err_put_hcd: 141 usb_put_hcd(hcd); 142 err_power: 143 if (pdata->power_off) 144 pdata->power_off(dev); 145 146 return err; 147 } 148 149 static int ehci_platform_remove(struct platform_device *dev) 150 { 151 struct usb_hcd *hcd = platform_get_drvdata(dev); 152 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev); 153 154 usb_remove_hcd(hcd); 155 usb_put_hcd(hcd); 156 157 if (pdata->power_off) 158 pdata->power_off(dev); 159 160 if (pdata == &ehci_platform_defaults) 161 dev->dev.platform_data = NULL; 162 163 return 0; 164 } 165 166 #ifdef CONFIG_PM 167 168 static int ehci_platform_suspend(struct device *dev) 169 { 170 struct usb_hcd *hcd = dev_get_drvdata(dev); 171 struct usb_ehci_pdata *pdata = dev_get_platdata(dev); 172 struct platform_device *pdev = 173 container_of(dev, struct platform_device, dev); 174 bool do_wakeup = device_may_wakeup(dev); 175 int ret; 176 177 ret = ehci_suspend(hcd, do_wakeup); 178 179 if (pdata->power_suspend) 180 pdata->power_suspend(pdev); 181 182 return ret; 183 } 184 185 static int ehci_platform_resume(struct device *dev) 186 { 187 struct usb_hcd *hcd = dev_get_drvdata(dev); 188 struct usb_ehci_pdata *pdata = dev_get_platdata(dev); 189 struct platform_device *pdev = 190 container_of(dev, struct platform_device, dev); 191 192 if (pdata->power_on) { 193 int err = pdata->power_on(pdev); 194 if (err < 0) 195 return err; 196 } 197 198 ehci_resume(hcd, false); 199 return 0; 200 } 201 202 #else /* !CONFIG_PM */ 203 #define ehci_platform_suspend NULL 204 #define ehci_platform_resume NULL 205 #endif /* CONFIG_PM */ 206 207 static const struct of_device_id vt8500_ehci_ids[] = { 208 { .compatible = "via,vt8500-ehci", }, 209 { .compatible = "wm,prizm-ehci", }, 210 {} 211 }; 212 213 static const struct platform_device_id ehci_platform_table[] = { 214 { "ehci-platform", 0 }, 215 { } 216 }; 217 MODULE_DEVICE_TABLE(platform, ehci_platform_table); 218 219 static const struct dev_pm_ops ehci_platform_pm_ops = { 220 .suspend = ehci_platform_suspend, 221 .resume = ehci_platform_resume, 222 }; 223 224 static struct platform_driver ehci_platform_driver = { 225 .id_table = ehci_platform_table, 226 .probe = ehci_platform_probe, 227 .remove = ehci_platform_remove, 228 .shutdown = usb_hcd_platform_shutdown, 229 .driver = { 230 .owner = THIS_MODULE, 231 .name = "ehci-platform", 232 .pm = &ehci_platform_pm_ops, 233 .of_match_table = vt8500_ehci_ids, 234 } 235 }; 236 237 static int __init ehci_platform_init(void) 238 { 239 if (usb_disabled()) 240 return -ENODEV; 241 242 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 243 244 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides); 245 return platform_driver_register(&ehci_platform_driver); 246 } 247 module_init(ehci_platform_init); 248 249 static void __exit ehci_platform_cleanup(void) 250 { 251 platform_driver_unregister(&ehci_platform_driver); 252 } 253 module_exit(ehci_platform_cleanup); 254 255 MODULE_DESCRIPTION(DRIVER_DESC); 256 MODULE_AUTHOR("Hauke Mehrtens"); 257 MODULE_AUTHOR("Alan Stern"); 258 MODULE_LICENSE("GPL"); 259