1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * EHCI HCD (Host Controller Driver) for USB. 4 * 5 * Bus Glue for Xilinx EHCI core on the of_platform bus 6 * 7 * Copyright (c) 2009 Xilinx, Inc. 8 * 9 * Based on "ehci-ppc-of.c" by Valentine Barshak <vbarshak@ru.mvista.com> 10 * and "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> 11 * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> 12 */ 13 14#include <linux/err.h> 15#include <linux/signal.h> 16 17#include <linux/of.h> 18#include <linux/of_platform.h> 19#include <linux/of_address.h> 20#include <linux/of_irq.h> 21 22/** 23 * ehci_xilinx_port_handed_over - hand the port out if failed to enable it 24 * @hcd: Pointer to the usb_hcd device to which the host controller bound 25 * @portnum:Port number to which the device is attached. 26 * 27 * This function is used as a place to tell the user that the Xilinx USB host 28 * controller does support LS devices. And in an HS only configuration, it 29 * does not support FS devices either. It is hoped that this can help a 30 * confused user. 31 * 32 * There are cases when the host controller fails to enable the port due to, 33 * for example, insufficient power that can be supplied to the device from 34 * the USB bus. In those cases, the messages printed here are not helpful. 35 */ 36static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum) 37{ 38 dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum); 39 if (hcd->has_tt) { 40 dev_warn(hcd->self.controller, 41 "Maybe you have connected a low speed device?\n"); 42 43 dev_warn(hcd->self.controller, 44 "We do not support low speed devices\n"); 45 } else { 46 dev_warn(hcd->self.controller, 47 "Maybe your device is not a high speed device?\n"); 48 dev_warn(hcd->self.controller, 49 "The USB host controller does not support full speed " 50 "nor low speed devices\n"); 51 dev_warn(hcd->self.controller, 52 "You can reconfigure the host controller to have " 53 "full speed support\n"); 54 } 55 56 return 0; 57} 58 59 60static const struct hc_driver ehci_xilinx_of_hc_driver = { 61 .description = hcd_name, 62 .product_desc = "OF EHCI", 63 .hcd_priv_size = sizeof(struct ehci_hcd), 64 65 /* 66 * generic hardware linkage 67 */ 68 .irq = ehci_irq, 69 .flags = HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH, 70 71 /* 72 * basic lifecycle operations 73 */ 74 .reset = ehci_setup, 75 .start = ehci_run, 76 .stop = ehci_stop, 77 .shutdown = ehci_shutdown, 78 79 /* 80 * managing i/o requests and associated device resources 81 */ 82 .urb_enqueue = ehci_urb_enqueue, 83 .urb_dequeue = ehci_urb_dequeue, 84 .endpoint_disable = ehci_endpoint_disable, 85 .endpoint_reset = ehci_endpoint_reset, 86 87 /* 88 * scheduling support 89 */ 90 .get_frame_number = ehci_get_frame, 91 92 /* 93 * root hub support 94 */ 95 .hub_status_data = ehci_hub_status_data, 96 .hub_control = ehci_hub_control, 97#ifdef CONFIG_PM 98 .bus_suspend = ehci_bus_suspend, 99 .bus_resume = ehci_bus_resume, 100#endif 101 .relinquish_port = NULL, 102 .port_handed_over = ehci_xilinx_port_handed_over, 103 104 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 105}; 106 107/** 108 * ehci_hcd_xilinx_of_probe - Probe method for the USB host controller 109 * @op: pointer to the platform_device bound to the host controller 110 * 111 * This function requests resources and sets up appropriate properties for the 112 * host controller. Because the Xilinx USB host controller can be configured 113 * as HS only or HS/FS only, it checks the configuration in the device tree 114 * entry, and sets an appropriate value for hcd->has_tt. 115 */ 116static int ehci_hcd_xilinx_of_probe(struct platform_device *op) 117{ 118 struct device_node *dn = op->dev.of_node; 119 struct usb_hcd *hcd; 120 struct ehci_hcd *ehci; 121 struct resource res; 122 int irq; 123 int rv; 124 int *value; 125 126 if (usb_disabled()) 127 return -ENODEV; 128 129 dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n"); 130 131 rv = of_address_to_resource(dn, 0, &res); 132 if (rv) 133 return rv; 134 135 hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev, 136 "XILINX-OF USB"); 137 if (!hcd) 138 return -ENOMEM; 139 140 hcd->rsrc_start = res.start; 141 hcd->rsrc_len = resource_size(&res); 142 143 irq = irq_of_parse_and_map(dn, 0); 144 if (!irq) { 145 dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n", 146 __FILE__); 147 rv = -EBUSY; 148 goto err_irq; 149 } 150 151 hcd->regs = devm_ioremap_resource(&op->dev, &res); 152 if (IS_ERR(hcd->regs)) { 153 rv = PTR_ERR(hcd->regs); 154 goto err_irq; 155 } 156 157 ehci = hcd_to_ehci(hcd); 158 159 /* This core always has big-endian register interface and uses 160 * big-endian memory descriptors. 161 */ 162 ehci->big_endian_mmio = 1; 163 ehci->big_endian_desc = 1; 164 165 /* Check whether the FS support option is selected in the hardware. 166 */ 167 value = (int *)of_get_property(dn, "xlnx,support-usb-fs", NULL); 168 if (value && (*value == 1)) { 169 ehci_dbg(ehci, "USB host controller supports FS devices\n"); 170 hcd->has_tt = 1; 171 } else { 172 ehci_dbg(ehci, 173 "USB host controller is HS only\n"); 174 hcd->has_tt = 0; 175 } 176 177 /* Debug registers are at the first 0x100 region 178 */ 179 ehci->caps = hcd->regs + 0x100; 180 181 rv = usb_add_hcd(hcd, irq, 0); 182 if (rv == 0) { 183 device_wakeup_enable(hcd->self.controller); 184 return 0; 185 } 186 187err_irq: 188 usb_put_hcd(hcd); 189 190 return rv; 191} 192 193/** 194 * ehci_hcd_xilinx_of_remove - shutdown hcd and release resources 195 * @op: pointer to platform_device structure that is to be removed 196 * 197 * Remove the hcd structure, and release resources that has been requested 198 * during probe. 199 */ 200static int ehci_hcd_xilinx_of_remove(struct platform_device *op) 201{ 202 struct usb_hcd *hcd = platform_get_drvdata(op); 203 204 dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n"); 205 206 usb_remove_hcd(hcd); 207 208 usb_put_hcd(hcd); 209 210 return 0; 211} 212 213static const struct of_device_id ehci_hcd_xilinx_of_match[] = { 214 {.compatible = "xlnx,xps-usb-host-1.00.a",}, 215 {}, 216}; 217MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match); 218 219static struct platform_driver ehci_hcd_xilinx_of_driver = { 220 .probe = ehci_hcd_xilinx_of_probe, 221 .remove = ehci_hcd_xilinx_of_remove, 222 .shutdown = usb_hcd_platform_shutdown, 223 .driver = { 224 .name = "xilinx-of-ehci", 225 .of_match_table = ehci_hcd_xilinx_of_match, 226 }, 227}; 228