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