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 = pdev->dev.platform_data; 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 ehci->caps = hcd->regs + pdata->caps_offset; 52 retval = ehci_setup(hcd); 53 if (retval) 54 return retval; 55 56 if (pdata->no_io_watchdog) 57 ehci->need_io_watchdog = 0; 58 return 0; 59 } 60 61 static struct hc_driver __read_mostly ehci_platform_hc_driver; 62 63 static const struct ehci_driver_overrides platform_overrides __initconst = { 64 .reset = ehci_platform_reset, 65 }; 66 67 static struct usb_ehci_pdata ehci_platform_defaults; 68 69 static int ehci_platform_probe(struct platform_device *dev) 70 { 71 struct usb_hcd *hcd; 72 struct resource *res_mem; 73 struct usb_ehci_pdata *pdata; 74 int irq; 75 int err = -ENOMEM; 76 77 if (usb_disabled()) 78 return -ENODEV; 79 80 /* 81 * use reasonable defaults so platforms don't have to provide these. 82 * with DT probing on ARM, none of these are set. 83 */ 84 if (!dev->dev.platform_data) 85 dev->dev.platform_data = &ehci_platform_defaults; 86 if (!dev->dev.dma_mask) 87 dev->dev.dma_mask = &dev->dev.coherent_dma_mask; 88 if (!dev->dev.coherent_dma_mask) 89 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 90 91 pdata = dev->dev.platform_data; 92 93 irq = platform_get_irq(dev, 0); 94 if (irq < 0) { 95 dev_err(&dev->dev, "no irq provided"); 96 return irq; 97 } 98 res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0); 99 if (!res_mem) { 100 dev_err(&dev->dev, "no memory resource provided"); 101 return -ENXIO; 102 } 103 104 if (pdata->power_on) { 105 err = pdata->power_on(dev); 106 if (err < 0) 107 return err; 108 } 109 110 hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev, 111 dev_name(&dev->dev)); 112 if (!hcd) { 113 err = -ENOMEM; 114 goto err_power; 115 } 116 117 hcd->rsrc_start = res_mem->start; 118 hcd->rsrc_len = resource_size(res_mem); 119 120 hcd->regs = devm_ioremap_resource(&dev->dev, res_mem); 121 if (IS_ERR(hcd->regs)) { 122 err = PTR_ERR(hcd->regs); 123 goto err_put_hcd; 124 } 125 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 126 if (err) 127 goto err_put_hcd; 128 129 platform_set_drvdata(dev, hcd); 130 131 return err; 132 133 err_put_hcd: 134 usb_put_hcd(hcd); 135 err_power: 136 if (pdata->power_off) 137 pdata->power_off(dev); 138 139 return err; 140 } 141 142 static int ehci_platform_remove(struct platform_device *dev) 143 { 144 struct usb_hcd *hcd = platform_get_drvdata(dev); 145 struct usb_ehci_pdata *pdata = dev->dev.platform_data; 146 147 usb_remove_hcd(hcd); 148 usb_put_hcd(hcd); 149 platform_set_drvdata(dev, NULL); 150 151 if (pdata->power_off) 152 pdata->power_off(dev); 153 154 if (pdata == &ehci_platform_defaults) 155 dev->dev.platform_data = NULL; 156 157 return 0; 158 } 159 160 #ifdef CONFIG_PM 161 162 static int ehci_platform_suspend(struct device *dev) 163 { 164 struct usb_hcd *hcd = dev_get_drvdata(dev); 165 struct usb_ehci_pdata *pdata = dev->platform_data; 166 struct platform_device *pdev = 167 container_of(dev, struct platform_device, dev); 168 bool do_wakeup = device_may_wakeup(dev); 169 int ret; 170 171 ret = ehci_suspend(hcd, do_wakeup); 172 173 if (pdata->power_suspend) 174 pdata->power_suspend(pdev); 175 176 return ret; 177 } 178 179 static int ehci_platform_resume(struct device *dev) 180 { 181 struct usb_hcd *hcd = dev_get_drvdata(dev); 182 struct usb_ehci_pdata *pdata = dev->platform_data; 183 struct platform_device *pdev = 184 container_of(dev, struct platform_device, dev); 185 186 if (pdata->power_on) { 187 int err = pdata->power_on(pdev); 188 if (err < 0) 189 return err; 190 } 191 192 ehci_resume(hcd, false); 193 return 0; 194 } 195 196 #else /* !CONFIG_PM */ 197 #define ehci_platform_suspend NULL 198 #define ehci_platform_resume NULL 199 #endif /* CONFIG_PM */ 200 201 static const struct of_device_id vt8500_ehci_ids[] = { 202 { .compatible = "via,vt8500-ehci", }, 203 { .compatible = "wm,prizm-ehci", }, 204 {} 205 }; 206 207 static const struct platform_device_id ehci_platform_table[] = { 208 { "ehci-platform", 0 }, 209 { } 210 }; 211 MODULE_DEVICE_TABLE(platform, ehci_platform_table); 212 213 static const struct dev_pm_ops ehci_platform_pm_ops = { 214 .suspend = ehci_platform_suspend, 215 .resume = ehci_platform_resume, 216 }; 217 218 static struct platform_driver ehci_platform_driver = { 219 .id_table = ehci_platform_table, 220 .probe = ehci_platform_probe, 221 .remove = ehci_platform_remove, 222 .shutdown = usb_hcd_platform_shutdown, 223 .driver = { 224 .owner = THIS_MODULE, 225 .name = "ehci-platform", 226 .pm = &ehci_platform_pm_ops, 227 .of_match_table = of_match_ptr(vt8500_ehci_ids), 228 } 229 }; 230 231 static int __init ehci_platform_init(void) 232 { 233 if (usb_disabled()) 234 return -ENODEV; 235 236 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 237 238 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides); 239 return platform_driver_register(&ehci_platform_driver); 240 } 241 module_init(ehci_platform_init); 242 243 static void __exit ehci_platform_cleanup(void) 244 { 245 platform_driver_unregister(&ehci_platform_driver); 246 } 247 module_exit(ehci_platform_cleanup); 248 249 MODULE_DESCRIPTION(DRIVER_DESC); 250 MODULE_AUTHOR("Hauke Mehrtens"); 251 MODULE_AUTHOR("Alan Stern"); 252 MODULE_LICENSE("GPL"); 253