drivers/usb/host/ehci-xilinx-of.c

   1 /*
   2  * EHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * Bus Glue for Xilinx EHCI core on the of_platform bus
   5  *
   6  * Copyright (c) 2009 Xilinx, Inc.
   7  *
   8  * Based on "ehci-ppc-of.c" by Valentine Barshak <vbarshak@ru.mvista.com>
   9  * and "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
  10  * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the
  14  * Free Software Foundation; either version 2 of the License, or (at your
  15  * option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  19  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  * for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software Foundation,
  24  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  */
  27
  28 #include <linux/err.h>
  29 #include <linux/signal.h>
  30
  31 #include <linux/of.h>
  32 #include <linux/of_platform.h>
  33 #include <linux/of_address.h>
  34
  35 /**
  36  * ehci_xilinx_port_handed_over - hand the port out if failed to enable it
  37  * @hcd:        Pointer to the usb_hcd device to which the host controller bound
  38  * @portnum:Port number to which the device is attached.
  39  *
  40  * This function is used as a place to tell the user that the Xilinx USB host
  41  * controller does support LS devices. And in an HS only configuration, it
  42  * does not support FS devices either. It is hoped that this can help a
  43  * confused user.
  44  *
  45  * There are cases when the host controller fails to enable the port due to,
  46  * for example, insufficient power that can be supplied to the device from
  47  * the USB bus. In those cases, the messages printed here are not helpful.
  48  */
  49 static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum)
  50 {
  51         dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum);
  52         if (hcd->has_tt) {
  53                 dev_warn(hcd->self.controller,
  54                         "Maybe you have connected a low speed device?\n");
  55
  56                 dev_warn(hcd->self.controller,
  57                         "We do not support low speed devices\n");
  58         } else {
  59                 dev_warn(hcd->self.controller,
  60                         "Maybe your device is not a high speed device?\n");
  61                 dev_warn(hcd->self.controller,
  62                         "The USB host controller does not support full speed "
  63                         "nor low speed devices\n");
  64                 dev_warn(hcd->self.controller,
  65                         "You can reconfigure the host controller to have "
  66                         "full speed support\n");
  67         }
  68
  69         return 0;
  70 }
  71
  72
  73 static const struct hc_driver ehci_xilinx_of_hc_driver = {
  74         .description            = hcd_name,
  75         .product_desc           = "OF EHCI",
  76         .hcd_priv_size          = sizeof(struct ehci_hcd),
  77
  78         /*
  79          * generic hardware linkage
  80          */
  81         .irq                    = ehci_irq,
  82         .flags                  = HCD_MEMORY | HCD_USB2 | HCD_BH,
  83
  84         /*
  85          * basic lifecycle operations
  86          */
  87         .reset                  = ehci_setup,
  88         .start                  = ehci_run,
  89         .stop                   = ehci_stop,
  90         .shutdown               = ehci_shutdown,
  91
  92         /*
  93          * managing i/o requests and associated device resources
  94          */
  95         .urb_enqueue            = ehci_urb_enqueue,
  96         .urb_dequeue            = ehci_urb_dequeue,
  97         .endpoint_disable       = ehci_endpoint_disable,
  98         .endpoint_reset         = ehci_endpoint_reset,
  99
 100         /*
 101          * scheduling support
 102          */
 103         .get_frame_number       = ehci_get_frame,
 104
 105         /*
 106          * root hub support
 107          */
 108         .hub_status_data        = ehci_hub_status_data,
 109         .hub_control            = ehci_hub_control,
 110 #ifdef  CONFIG_PM
 111         .bus_suspend            = ehci_bus_suspend,
 112         .bus_resume             = ehci_bus_resume,
 113 #endif
 114         .relinquish_port        = NULL,
 115         .port_handed_over       = ehci_xilinx_port_handed_over,
 116
 117         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 118 };
 119
 120 /**
 121  * ehci_hcd_xilinx_of_probe - Probe method for the USB host controller
 122  * @op:         pointer to the platform_device bound to the host controller
 123  *
 124  * This function requests resources and sets up appropriate properties for the
 125  * host controller. Because the Xilinx USB host controller can be configured
 126  * as HS only or HS/FS only, it checks the configuration in the device tree
 127  * entry, and sets an appropriate value for hcd->has_tt.
 128  */
 129 static int ehci_hcd_xilinx_of_probe(struct platform_device *op)
 130 {
 131         struct device_node *dn = op->dev.of_node;
 132         struct usb_hcd *hcd;
 133         struct ehci_hcd *ehci;
 134         struct resource res;
 135         int irq;
 136         int rv;
 137         int *value;
 138
 139         if (usb_disabled())
 140                 return -ENODEV;
 141
 142         dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n");
 143
 144         rv = of_address_to_resource(dn, 0, &res);
 145         if (rv)
 146                 return rv;
 147
 148         hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev,
 149                                 "XILINX-OF USB");
 150         if (!hcd)
 151                 return -ENOMEM;
 152
 153         hcd->rsrc_start = res.start;
 154         hcd->rsrc_len = resource_size(&res);
 155
 156         irq = irq_of_parse_and_map(dn, 0);
 157         if (!irq) {
 158                 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
 159                 rv = -EBUSY;
 160                 goto err_irq;
 161         }
 162
 163         hcd->regs = devm_ioremap_resource(&op->dev, &res);
 164         if (IS_ERR(hcd->regs)) {
 165                 rv = PTR_ERR(hcd->regs);
 166                 goto err_irq;
 167         }
 168
 169         ehci = hcd_to_ehci(hcd);
 170
 171         /* This core always has big-endian register interface and uses
 172          * big-endian memory descriptors.
 173          */
 174         ehci->big_endian_mmio = 1;
 175         ehci->big_endian_desc = 1;
 176
 177         /* Check whether the FS support option is selected in the hardware.
 178          */
 179         value = (int *)of_get_property(dn, "xlnx,support-usb-fs", NULL);
 180         if (value && (*value == 1)) {
 181                 ehci_dbg(ehci, "USB host controller supports FS devices\n");
 182                 hcd->has_tt = 1;
 183         } else {
 184                 ehci_dbg(ehci,
 185                         "USB host controller is HS only\n");
 186                 hcd->has_tt = 0;
 187         }
 188
 189         /* Debug registers are at the first 0x100 region
 190          */
 191         ehci->caps = hcd->regs + 0x100;
 192
 193         rv = usb_add_hcd(hcd, irq, 0);
 194         if (rv == 0)
 195                 return 0;
 196
 197 err_irq:
 198         usb_put_hcd(hcd);
 199
 200         return rv;
 201 }
 202
 203 /**
 204  * ehci_hcd_xilinx_of_remove - shutdown hcd and release resources
 205  * @op:         pointer to platform_device structure that is to be removed
 206  *
 207  * Remove the hcd structure, and release resources that has been requested
 208  * during probe.
 209  */
 210 static int ehci_hcd_xilinx_of_remove(struct platform_device *op)
 211 {
 212         struct usb_hcd *hcd = platform_get_drvdata(op);
 213
 214         dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n");
 215
 216         usb_remove_hcd(hcd);
 217
 218         usb_put_hcd(hcd);
 219
 220         return 0;
 221 }
 222
 223 static const struct of_device_id ehci_hcd_xilinx_of_match[] = {
 224                 {.compatible = "xlnx,xps-usb-host-1.00.a",},
 225         {},
 226 };
 227 MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match);
 228
 229 static struct platform_driver ehci_hcd_xilinx_of_driver = {
 230         .probe          = ehci_hcd_xilinx_of_probe,
 231         .remove         = ehci_hcd_xilinx_of_remove,
 232         .shutdown       = usb_hcd_platform_shutdown,
 233         .driver = {
 234                 .name = "xilinx-of-ehci",
 235                 .owner = THIS_MODULE,
 236                 .of_match_table = ehci_hcd_xilinx_of_match,
 237         },
 238 };