1 /* 2 * OHCI HCD (Host Controller Driver) for USB. 3 * 4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> 5 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> 6 * (C) Copyright 2002 Hewlett-Packard Company 7 * (C) Copyright 2006 Sylvain Munaut <tnt@246tNt.com> 8 * 9 * Bus glue for OHCI HC on the of_platform bus 10 * 11 * Modified for of_platform bus from ohci-sa1111.c 12 * 13 * This file is licenced under the GPL. 14 */ 15 16 #include <linux/signal.h> 17 #include <linux/of_platform.h> 18 19 #include <asm/prom.h> 20 21 22 static int __devinit 23 ohci_ppc_of_start(struct usb_hcd *hcd) 24 { 25 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 26 int ret; 27 28 if ((ret = ohci_init(ohci)) < 0) 29 return ret; 30 31 if ((ret = ohci_run(ohci)) < 0) { 32 err("can't start %s", ohci_to_hcd(ohci)->self.bus_name); 33 ohci_stop(hcd); 34 return ret; 35 } 36 37 return 0; 38 } 39 40 static const struct hc_driver ohci_ppc_of_hc_driver = { 41 .description = hcd_name, 42 .product_desc = "OF OHCI", 43 .hcd_priv_size = sizeof(struct ohci_hcd), 44 45 /* 46 * generic hardware linkage 47 */ 48 .irq = ohci_irq, 49 .flags = HCD_USB11 | HCD_MEMORY, 50 51 /* 52 * basic lifecycle operations 53 */ 54 .start = ohci_ppc_of_start, 55 .stop = ohci_stop, 56 .shutdown = ohci_shutdown, 57 58 /* 59 * managing i/o requests and associated device resources 60 */ 61 .urb_enqueue = ohci_urb_enqueue, 62 .urb_dequeue = ohci_urb_dequeue, 63 .endpoint_disable = ohci_endpoint_disable, 64 65 /* 66 * scheduling support 67 */ 68 .get_frame_number = ohci_get_frame, 69 70 /* 71 * root hub support 72 */ 73 .hub_status_data = ohci_hub_status_data, 74 .hub_control = ohci_hub_control, 75 #ifdef CONFIG_PM 76 .bus_suspend = ohci_bus_suspend, 77 .bus_resume = ohci_bus_resume, 78 #endif 79 .start_port_reset = ohci_start_port_reset, 80 }; 81 82 83 static int __devinit 84 ohci_hcd_ppc_of_probe(struct platform_device *op, const struct of_device_id *match) 85 { 86 struct device_node *dn = op->dev.of_node; 87 struct usb_hcd *hcd; 88 struct ohci_hcd *ohci; 89 struct resource res; 90 int irq; 91 92 int rv; 93 int is_bigendian; 94 struct device_node *np; 95 96 if (usb_disabled()) 97 return -ENODEV; 98 99 is_bigendian = 100 of_device_is_compatible(dn, "ohci-bigendian") || 101 of_device_is_compatible(dn, "ohci-be"); 102 103 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); 104 105 rv = of_address_to_resource(dn, 0, &res); 106 if (rv) 107 return rv; 108 109 hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); 110 if (!hcd) 111 return -ENOMEM; 112 113 hcd->rsrc_start = res.start; 114 hcd->rsrc_len = res.end - res.start + 1; 115 116 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 117 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__); 118 rv = -EBUSY; 119 goto err_rmr; 120 } 121 122 irq = irq_of_parse_and_map(dn, 0); 123 if (irq == NO_IRQ) { 124 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__); 125 rv = -EBUSY; 126 goto err_irq; 127 } 128 129 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 130 if (!hcd->regs) { 131 printk(KERN_ERR "%s: ioremap failed\n", __FILE__); 132 rv = -ENOMEM; 133 goto err_ioremap; 134 } 135 136 ohci = hcd_to_ohci(hcd); 137 if (is_bigendian) { 138 ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC; 139 if (of_device_is_compatible(dn, "fsl,mpc5200-ohci")) 140 ohci->flags |= OHCI_QUIRK_FRAME_NO; 141 if (of_device_is_compatible(dn, "mpc5200-ohci")) 142 ohci->flags |= OHCI_QUIRK_FRAME_NO; 143 } 144 145 ohci_hcd_init(ohci); 146 147 rv = usb_add_hcd(hcd, irq, IRQF_DISABLED); 148 if (rv == 0) 149 return 0; 150 151 /* by now, 440epx is known to show usb_23 erratum */ 152 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx"); 153 154 /* Work around - At this point ohci_run has executed, the 155 * controller is running, everything, the root ports, etc., is 156 * set up. If the ehci driver is loaded, put the ohci core in 157 * the suspended state. The ehci driver will bring it out of 158 * suspended state when / if a non-high speed USB device is 159 * attached to the USB Host port. If the ehci driver is not 160 * loaded, do nothing. request_mem_region is used to test if 161 * the ehci driver is loaded. 162 */ 163 if (np != NULL) { 164 if (!of_address_to_resource(np, 0, &res)) { 165 if (!request_mem_region(res.start, 0x4, hcd_name)) { 166 writel_be((readl_be(&ohci->regs->control) | 167 OHCI_USB_SUSPEND), &ohci->regs->control); 168 (void) readl_be(&ohci->regs->control); 169 } else 170 release_mem_region(res.start, 0x4); 171 } else 172 pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__); 173 } 174 175 iounmap(hcd->regs); 176 err_ioremap: 177 irq_dispose_mapping(irq); 178 err_irq: 179 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 180 err_rmr: 181 usb_put_hcd(hcd); 182 183 return rv; 184 } 185 186 static int ohci_hcd_ppc_of_remove(struct platform_device *op) 187 { 188 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 189 dev_set_drvdata(&op->dev, NULL); 190 191 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); 192 193 usb_remove_hcd(hcd); 194 195 iounmap(hcd->regs); 196 irq_dispose_mapping(hcd->irq); 197 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 198 199 usb_put_hcd(hcd); 200 201 return 0; 202 } 203 204 static int ohci_hcd_ppc_of_shutdown(struct platform_device *op) 205 { 206 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 207 208 if (hcd->driver->shutdown) 209 hcd->driver->shutdown(hcd); 210 211 return 0; 212 } 213 214 215 static const struct of_device_id ohci_hcd_ppc_of_match[] = { 216 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE 217 { 218 .name = "usb", 219 .compatible = "ohci-bigendian", 220 }, 221 { 222 .name = "usb", 223 .compatible = "ohci-be", 224 }, 225 #endif 226 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE 227 { 228 .name = "usb", 229 .compatible = "ohci-littledian", 230 }, 231 { 232 .name = "usb", 233 .compatible = "ohci-le", 234 }, 235 #endif 236 {}, 237 }; 238 MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match); 239 240 #if !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \ 241 !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE) 242 #error "No endianess selected for ppc-of-ohci" 243 #endif 244 245 246 static struct of_platform_driver ohci_hcd_ppc_of_driver = { 247 .probe = ohci_hcd_ppc_of_probe, 248 .remove = ohci_hcd_ppc_of_remove, 249 .shutdown = ohci_hcd_ppc_of_shutdown, 250 .driver = { 251 .name = "ppc-of-ohci", 252 .owner = THIS_MODULE, 253 .of_match_table = ohci_hcd_ppc_of_match, 254 }, 255 }; 256 257