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/signal.h>
  29
  30 #include <linux/of.h>
  31 #include <linux/of_platform.h>
  32 #include <linux/of_address.h>
  33
  34 /**
  35  * ehci_xilinx_port_handed_over - hand the port out if failed to enable it
  36  * @hcd:        Pointer to the usb_hcd device to which the host controller bound
  37  * @portnum:Port number to which the device is attached.
  38  *
  39  * This function is used as a place to tell the user that the Xilinx USB host
  40  * controller does support LS devices. And in an HS only configuration, it
  41  * does not support FS devices either. It is hoped that this can help a
  42  * confused user.
  43  *
  44  * There are cases when the host controller fails to enable the port due to,
  45  * for example, insufficient power that can be supplied to the device from
  46  * the USB bus. In those cases, the messages printed here are not helpful.
  47  */
  48 static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum)
  49 {
  50         dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum);
  51         if (hcd->has_tt) {
  52                 dev_warn(hcd->self.controller,
  53                         "Maybe you have connected a low speed device?\n");
  54
  55                 dev_warn(hcd->self.controller,
  56                         "We do not support low speed devices\n");
  57         } else {
  58                 dev_warn(hcd->self.controller,
  59                         "Maybe your device is not a high speed device?\n");
  60                 dev_warn(hcd->self.controller,
  61                         "The USB host controller does not support full speed "
  62                         "nor low speed devices\n");
  63                 dev_warn(hcd->self.controller,
  64                         "You can reconfigure the host controller to have "
  65                         "full speed support\n");
  66         }
  67
  68         return 0;
  69 }
  70
  71
  72 static const struct hc_driver ehci_xilinx_of_hc_driver = {
  73         .description            = hcd_name,
  74         .product_desc           = "OF EHCI",
  75         .hcd_priv_size          = sizeof(struct ehci_hcd),
  76
  77         /*
  78          * generic hardware linkage
  79          */
  80         .irq                    = ehci_irq,
  81         .flags                  = HCD_MEMORY | HCD_USB2,
  82
  83         /*
  84          * basic lifecycle operations
  85          */
  86         .reset                  = ehci_setup,
  87         .start                  = ehci_run,
  88         .stop                   = ehci_stop,
  89         .shutdown               = ehci_shutdown,
  90
  91         /*
  92          * managing i/o requests and associated device resources
  93          */
  94         .urb_enqueue            = ehci_urb_enqueue,
  95         .urb_dequeue            = ehci_urb_dequeue,
  96         .endpoint_disable       = ehci_endpoint_disable,
  97         .endpoint_reset         = ehci_endpoint_reset,
  98
  99         /*
 100          * scheduling support
 101          */
 102         .get_frame_number       = ehci_get_frame,
 103
 104         /*
 105          * root hub support
 106          */
 107         .hub_status_data        = ehci_hub_status_data,
 108         .hub_control            = ehci_hub_control,
 109 #ifdef  CONFIG_PM
 110         .bus_suspend            = ehci_bus_suspend,
 111         .bus_resume             = ehci_bus_resume,
 112 #endif
 113         .relinquish_port        = NULL,
 114         .port_handed_over       = ehci_xilinx_port_handed_over,
 115
 116         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 117 };
 118
 119 /**
 120  * ehci_hcd_xilinx_of_probe - Probe method for the USB host controller
 121  * @op:         pointer to the platform_device bound to the host controller
 122  *
 123  * This function requests resources and sets up appropriate properties for the
 124  * host controller. Because the Xilinx USB host controller can be configured
 125  * as HS only or HS/FS only, it checks the configuration in the device tree
 126  * entry, and sets an appropriate value for hcd->has_tt.
 127  */
 128 static int __devinit ehci_hcd_xilinx_of_probe(struct platform_device *op)
 129 {
 130         struct device_node *dn = op->dev.of_node;
 131         struct usb_hcd *hcd;
 132         struct ehci_hcd *ehci;
 133         struct resource res;
 134         int irq;
 135         int rv;
 136         int *value;
 137
 138         if (usb_disabled())
 139                 return -ENODEV;
 140
 141         dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n");
 142
 143         rv = of_address_to_resource(dn, 0, &res);
 144         if (rv)
 145                 return rv;
 146
 147         hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev,
 148                                 "XILINX-OF USB");
 149         if (!hcd)
 150                 return -ENOMEM;
 151
 152         hcd->rsrc_start = res.start;
 153         hcd->rsrc_len = resource_size(&res);
 154
 155         irq = irq_of_parse_and_map(dn, 0);
 156         if (!irq) {
 157                 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
 158                 rv = -EBUSY;
 159                 goto err_irq;
 160         }
 161
 162         hcd->regs = devm_request_and_ioremap(&op->dev, &res);
 163         if (!hcd->regs) {
 164                 pr_err("%s: devm_request_and_ioremap failed\n", __FILE__);
 165                 rv = -ENOMEM;
 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 = dev_get_drvdata(&op->dev);
 213         dev_set_drvdata(&op->dev, NULL);
 214
 215         dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n");
 216
 217         usb_remove_hcd(hcd);
 218
 219         usb_put_hcd(hcd);
 220
 221         return 0;
 222 }
 223
 224 /**
 225  * ehci_hcd_xilinx_of_shutdown - shutdown the hcd
 226  * @op:         pointer to platform_device structure that is to be removed
 227  *
 228  * Properly shutdown the hcd, call driver's shutdown routine.
 229  */
 230 static void ehci_hcd_xilinx_of_shutdown(struct platform_device *op)
 231 {
 232         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 233
 234         if (hcd->driver->shutdown)
 235                 hcd->driver->shutdown(hcd);
 236 }
 237
 238
 239 static const struct of_device_id ehci_hcd_xilinx_of_match[] = {
 240                 {.compatible = "xlnx,xps-usb-host-1.00.a",},
 241         {},
 242 };
 243 MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match);
 244
 245 static struct platform_driver ehci_hcd_xilinx_of_driver = {
 246         .probe          = ehci_hcd_xilinx_of_probe,
 247         .remove         = ehci_hcd_xilinx_of_remove,
 248         .shutdown       = ehci_hcd_xilinx_of_shutdown,
 249         .driver = {
 250                 .name = "xilinx-of-ehci",
 251                 .owner = THIS_MODULE,
 252                 .of_match_table = ehci_hcd_xilinx_of_match,
 253         },
 254 };