drivers/usb/host/ohci-ppc-of.c

   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