1 // SPDX-License-Identifier: GPL-1.0+ 2 /* 3 * OHCI HCD (Host Controller Driver) for USB. 4 * 5 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> 6 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> 7 * (C) Copyright 2002 Hewlett-Packard Company 8 * (C) Copyright 2006 Sylvain Munaut <tnt@246tNt.com> 9 * 10 * Bus glue for OHCI HC on the of_platform bus 11 * 12 * Modified for of_platform bus from ohci-sa1111.c 13 * 14 * This file is licenced under the GPL. 15 */ 16 17 #include <linux/signal.h> 18 #include <linux/of_address.h> 19 #include <linux/of_irq.h> 20 #include <linux/of_platform.h> 21 22 static int 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 dev_err(hcd->self.controller, "can't start %s\n", 33 hcd->self.bus_name); 34 ohci_stop(hcd); 35 return ret; 36 } 37 38 return 0; 39 } 40 41 static const struct hc_driver ohci_ppc_of_hc_driver = { 42 .description = hcd_name, 43 .product_desc = "OF OHCI", 44 .hcd_priv_size = sizeof(struct ohci_hcd), 45 46 /* 47 * generic hardware linkage 48 */ 49 .irq = ohci_irq, 50 .flags = HCD_USB11 | HCD_DMA | HCD_MEMORY, 51 52 /* 53 * basic lifecycle operations 54 */ 55 .start = ohci_ppc_of_start, 56 .stop = ohci_stop, 57 .shutdown = ohci_shutdown, 58 59 /* 60 * managing i/o requests and associated device resources 61 */ 62 .urb_enqueue = ohci_urb_enqueue, 63 .urb_dequeue = ohci_urb_dequeue, 64 .endpoint_disable = ohci_endpoint_disable, 65 66 /* 67 * scheduling support 68 */ 69 .get_frame_number = ohci_get_frame, 70 71 /* 72 * root hub support 73 */ 74 .hub_status_data = ohci_hub_status_data, 75 .hub_control = ohci_hub_control, 76 #ifdef CONFIG_PM 77 .bus_suspend = ohci_bus_suspend, 78 .bus_resume = ohci_bus_resume, 79 #endif 80 .start_port_reset = ohci_start_port_reset, 81 }; 82 83 84 static int ohci_hcd_ppc_of_probe(struct platform_device *op) 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 = resource_size(&res); 115 116 hcd->regs = devm_ioremap_resource(&op->dev, &res); 117 if (IS_ERR(hcd->regs)) { 118 rv = PTR_ERR(hcd->regs); 119 goto err_rmr; 120 } 121 122 irq = irq_of_parse_and_map(dn, 0); 123 if (!irq) { 124 dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n", 125 __FILE__); 126 rv = -EBUSY; 127 goto err_rmr; 128 } 129 130 ohci = hcd_to_ohci(hcd); 131 if (is_bigendian) { 132 ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC; 133 if (of_device_is_compatible(dn, "fsl,mpc5200-ohci")) 134 ohci->flags |= OHCI_QUIRK_FRAME_NO; 135 if (of_device_is_compatible(dn, "mpc5200-ohci")) 136 ohci->flags |= OHCI_QUIRK_FRAME_NO; 137 } 138 139 ohci_hcd_init(ohci); 140 141 rv = usb_add_hcd(hcd, irq, 0); 142 if (rv == 0) { 143 device_wakeup_enable(hcd->self.controller); 144 return 0; 145 } 146 147 /* by now, 440epx is known to show usb_23 erratum */ 148 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx"); 149 150 /* Work around - At this point ohci_run has executed, the 151 * controller is running, everything, the root ports, etc., is 152 * set up. If the ehci driver is loaded, put the ohci core in 153 * the suspended state. The ehci driver will bring it out of 154 * suspended state when / if a non-high speed USB device is 155 * attached to the USB Host port. If the ehci driver is not 156 * loaded, do nothing. request_mem_region is used to test if 157 * the ehci driver is loaded. 158 */ 159 if (np != NULL) { 160 if (!of_address_to_resource(np, 0, &res)) { 161 if (!request_mem_region(res.start, 0x4, hcd_name)) { 162 writel_be((readl_be(&ohci->regs->control) | 163 OHCI_USB_SUSPEND), &ohci->regs->control); 164 (void) readl_be(&ohci->regs->control); 165 } else 166 release_mem_region(res.start, 0x4); 167 } else 168 pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__); 169 of_node_put(np); 170 } 171 172 irq_dispose_mapping(irq); 173 err_rmr: 174 usb_put_hcd(hcd); 175 176 return rv; 177 } 178 179 static void ohci_hcd_ppc_of_remove(struct platform_device *op) 180 { 181 struct usb_hcd *hcd = platform_get_drvdata(op); 182 183 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); 184 185 usb_remove_hcd(hcd); 186 187 irq_dispose_mapping(hcd->irq); 188 189 usb_put_hcd(hcd); 190 } 191 192 static const struct of_device_id ohci_hcd_ppc_of_match[] = { 193 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE 194 { 195 .name = "usb", 196 .compatible = "ohci-bigendian", 197 }, 198 { 199 .name = "usb", 200 .compatible = "ohci-be", 201 }, 202 #endif 203 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE 204 { 205 .name = "usb", 206 .compatible = "ohci-littledian", 207 }, 208 { 209 .name = "usb", 210 .compatible = "ohci-le", 211 }, 212 #endif 213 {}, 214 }; 215 MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match); 216 217 #if !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \ 218 !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE) 219 #error "No endianness selected for ppc-of-ohci" 220 #endif 221 222 223 static struct platform_driver ohci_hcd_ppc_of_driver = { 224 .probe = ohci_hcd_ppc_of_probe, 225 .remove_new = ohci_hcd_ppc_of_remove, 226 .shutdown = usb_hcd_platform_shutdown, 227 .driver = { 228 .name = "ppc-of-ohci", 229 .of_match_table = ohci_hcd_ppc_of_match, 230 }, 231 }; 232 233