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