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