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 ohci_hcd_ppc_of_probe(struct platform_device *op) 84 { 85 struct device_node *dn = op->dev.of_node; 86 struct usb_hcd *hcd; 87 struct ohci_hcd *ohci; 88 struct resource res; 89 int irq; 90 91 int rv; 92 int is_bigendian; 93 struct device_node *np; 94 95 if (usb_disabled()) 96 return -ENODEV; 97 98 is_bigendian = 99 of_device_is_compatible(dn, "ohci-bigendian") || 100 of_device_is_compatible(dn, "ohci-be"); 101 102 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); 103 104 rv = of_address_to_resource(dn, 0, &res); 105 if (rv) 106 return rv; 107 108 hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); 109 if (!hcd) 110 return -ENOMEM; 111 112 hcd->rsrc_start = res.start; 113 hcd->rsrc_len = res.end - res.start + 1; 114 115 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 116 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__); 117 rv = -EBUSY; 118 goto err_rmr; 119 } 120 121 irq = irq_of_parse_and_map(dn, 0); 122 if (irq == NO_IRQ) { 123 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__); 124 rv = -EBUSY; 125 goto err_irq; 126 } 127 128 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 129 if (!hcd->regs) { 130 printk(KERN_ERR "%s: ioremap failed\n", __FILE__); 131 rv = -ENOMEM; 132 goto err_ioremap; 133 } 134 135 ohci = hcd_to_ohci(hcd); 136 if (is_bigendian) { 137 ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC; 138 if (of_device_is_compatible(dn, "fsl,mpc5200-ohci")) 139 ohci->flags |= OHCI_QUIRK_FRAME_NO; 140 if (of_device_is_compatible(dn, "mpc5200-ohci")) 141 ohci->flags |= OHCI_QUIRK_FRAME_NO; 142 } 143 144 ohci_hcd_init(ohci); 145 146 rv = usb_add_hcd(hcd, irq, IRQF_DISABLED); 147 if (rv == 0) 148 return 0; 149 150 /* by now, 440epx is known to show usb_23 erratum */ 151 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx"); 152 153 /* Work around - At this point ohci_run has executed, the 154 * controller is running, everything, the root ports, etc., is 155 * set up. If the ehci driver is loaded, put the ohci core in 156 * the suspended state. The ehci driver will bring it out of 157 * suspended state when / if a non-high speed USB device is 158 * attached to the USB Host port. If the ehci driver is not 159 * loaded, do nothing. request_mem_region is used to test if 160 * the ehci driver is loaded. 161 */ 162 if (np != NULL) { 163 if (!of_address_to_resource(np, 0, &res)) { 164 if (!request_mem_region(res.start, 0x4, hcd_name)) { 165 writel_be((readl_be(&ohci->regs->control) | 166 OHCI_USB_SUSPEND), &ohci->regs->control); 167 (void) readl_be(&ohci->regs->control); 168 } else 169 release_mem_region(res.start, 0x4); 170 } else 171 pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__); 172 } 173 174 iounmap(hcd->regs); 175 err_ioremap: 176 irq_dispose_mapping(irq); 177 err_irq: 178 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 179 err_rmr: 180 usb_put_hcd(hcd); 181 182 return rv; 183 } 184 185 static int ohci_hcd_ppc_of_remove(struct platform_device *op) 186 { 187 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 188 dev_set_drvdata(&op->dev, NULL); 189 190 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); 191 192 usb_remove_hcd(hcd); 193 194 iounmap(hcd->regs); 195 irq_dispose_mapping(hcd->irq); 196 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 197 198 usb_put_hcd(hcd); 199 200 return 0; 201 } 202 203 static void ohci_hcd_ppc_of_shutdown(struct platform_device *op) 204 { 205 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 206 207 if (hcd->driver->shutdown) 208 hcd->driver->shutdown(hcd); 209 } 210 211 212 static const struct of_device_id ohci_hcd_ppc_of_match[] = { 213 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE 214 { 215 .name = "usb", 216 .compatible = "ohci-bigendian", 217 }, 218 { 219 .name = "usb", 220 .compatible = "ohci-be", 221 }, 222 #endif 223 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE 224 { 225 .name = "usb", 226 .compatible = "ohci-littledian", 227 }, 228 { 229 .name = "usb", 230 .compatible = "ohci-le", 231 }, 232 #endif 233 {}, 234 }; 235 MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match); 236 237 #if !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \ 238 !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE) 239 #error "No endianess selected for ppc-of-ohci" 240 #endif 241 242 243 static struct platform_driver ohci_hcd_ppc_of_driver = { 244 .probe = ohci_hcd_ppc_of_probe, 245 .remove = ohci_hcd_ppc_of_remove, 246 .shutdown = ohci_hcd_ppc_of_shutdown, 247 .driver = { 248 .name = "ppc-of-ohci", 249 .owner = THIS_MODULE, 250 .of_match_table = ohci_hcd_ppc_of_match, 251 }, 252 }; 253 254