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 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 == NO_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         }
 170
 171         irq_dispose_mapping(irq);
 172 err_rmr:
 173         usb_put_hcd(hcd);
 174
 175         return rv;
 176 }
 177
 178 static int ohci_hcd_ppc_of_remove(struct platform_device *op)
 179 {
 180         struct usb_hcd *hcd = platform_get_drvdata(op);
 181
 182         dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
 183
 184         usb_remove_hcd(hcd);
 185
 186         irq_dispose_mapping(hcd->irq);
 187
 188         usb_put_hcd(hcd);
 189
 190         return 0;
 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-littledian",
 208         },
 209         {
 210                 .name = "usb",
 211                 .compatible = "ohci-le",
 212         },
 213 #endif
 214         {},
 215 };
 216 MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match);
 217
 218 #if     !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \
 219         !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE)
 220 #error "No endianness selected for ppc-of-ohci"
 221 #endif
 222
 223
 224 static struct platform_driver ohci_hcd_ppc_of_driver = {
 225         .probe          = ohci_hcd_ppc_of_probe,
 226         .remove         = ohci_hcd_ppc_of_remove,
 227         .shutdown       = usb_hcd_platform_shutdown,
 228         .driver = {
 229                 .name = "ppc-of-ohci",
 230                 .of_match_table = ohci_hcd_ppc_of_match,
 231         },
 232 };
 233