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
  33 /**
  34  * ehci_xilinx_of_setup - Initialize the device for ehci_reset()
  35  * @hcd:        Pointer to the usb_hcd device to which the host controller bound
  36  *
  37  * called during probe() after chip reset completes.
  38  */
  39 static int ehci_xilinx_of_setup(struct usb_hcd *hcd)
  40 {
  41         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  42         int             retval;
  43
  44         retval = ehci_halt(ehci);
  45         if (retval)
  46                 return retval;
  47
  48         retval = ehci_init(hcd);
  49         if (retval)
  50                 return retval;
  51
  52         ehci->sbrn = 0x20;
  53
  54         return ehci_reset(ehci);
  55 }
  56
  57 /**
  58  * ehci_xilinx_port_handed_over - hand the port out if failed to enable it
  59  * @hcd:        Pointer to the usb_hcd device to which the host controller bound
  60  * @portnum:Port number to which the device is attached.
  61  *
  62  * This function is used as a place to tell the user that the Xilinx USB host
  63  * controller does support LS devices. And in an HS only configuration, it
  64  * does not support FS devices either. It is hoped that this can help a
  65  * confused user.
  66  *
  67  * There are cases when the host controller fails to enable the port due to,
  68  * for example, insufficient power that can be supplied to the device from
  69  * the USB bus. In those cases, the messages printed here are not helpful.
  70  */
  71 static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum)
  72 {
  73         dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum);
  74         if (hcd->has_tt) {
  75                 dev_warn(hcd->self.controller,
  76                         "Maybe you have connected a low speed device?\n");
  77
  78                 dev_warn(hcd->self.controller,
  79                         "We do not support low speed devices\n");
  80         } else {
  81                 dev_warn(hcd->self.controller,
  82                         "Maybe your device is not a high speed device?\n");
  83                 dev_warn(hcd->self.controller,
  84                         "The USB host controller does not support full speed "
  85                         "nor low speed devices\n");
  86                 dev_warn(hcd->self.controller,
  87                         "You can reconfigure the host controller to have "
  88                         "full speed support\n");
  89         }
  90
  91         return 0;
  92 }
  93
  94
  95 static const struct hc_driver ehci_xilinx_of_hc_driver = {
  96         .description            = hcd_name,
  97         .product_desc           = "OF EHCI",
  98         .hcd_priv_size          = sizeof(struct ehci_hcd),
  99
 100         /*
 101          * generic hardware linkage
 102          */
 103         .irq                    = ehci_irq,
 104         .flags                  = HCD_MEMORY | HCD_USB2,
 105
 106         /*
 107          * basic lifecycle operations
 108          */
 109         .reset                  = ehci_xilinx_of_setup,
 110         .start                  = ehci_run,
 111         .stop                   = ehci_stop,
 112         .shutdown               = ehci_shutdown,
 113
 114         /*
 115          * managing i/o requests and associated device resources
 116          */
 117         .urb_enqueue            = ehci_urb_enqueue,
 118         .urb_dequeue            = ehci_urb_dequeue,
 119         .endpoint_disable       = ehci_endpoint_disable,
 120
 121         /*
 122          * scheduling support
 123          */
 124         .get_frame_number       = ehci_get_frame,
 125
 126         /*
 127          * root hub support
 128          */
 129         .hub_status_data        = ehci_hub_status_data,
 130         .hub_control            = ehci_hub_control,
 131 #ifdef  CONFIG_PM
 132         .bus_suspend            = ehci_bus_suspend,
 133         .bus_resume             = ehci_bus_resume,
 134 #endif
 135         .relinquish_port        = NULL,
 136         .port_handed_over       = ehci_xilinx_port_handed_over,
 137
 138         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 139 };
 140
 141 /**
 142  * ehci_hcd_xilinx_of_probe - Probe method for the USB host controller
 143  * @op:         pointer to the of_device to which the host controller bound
 144  * @match:      pointer to of_device_id structure, not used
 145  *
 146  * This function requests resources and sets up appropriate properties for the
 147  * host controller. Because the Xilinx USB host controller can be configured
 148  * as HS only or HS/FS only, it checks the configuration in the device tree
 149  * entry, and sets an appropriate value for hcd->has_tt.
 150  */
 151 static int __devinit
 152 ehci_hcd_xilinx_of_probe(struct of_device *op, const struct of_device_id *match)
 153 {
 154         struct device_node *dn = op->node;
 155         struct usb_hcd *hcd;
 156         struct ehci_hcd *ehci;
 157         struct resource res;
 158         int irq;
 159         int rv;
 160         int *value;
 161
 162         if (usb_disabled())
 163                 return -ENODEV;
 164
 165         dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n");
 166
 167         rv = of_address_to_resource(dn, 0, &res);
 168         if (rv)
 169                 return rv;
 170
 171         hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev,
 172                                 "XILINX-OF USB");
 173         if (!hcd)
 174                 return -ENOMEM;
 175
 176         hcd->rsrc_start = res.start;
 177         hcd->rsrc_len = res.end - res.start + 1;
 178
 179         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 180                 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
 181                 rv = -EBUSY;
 182                 goto err_rmr;
 183         }
 184
 185         irq = irq_of_parse_and_map(dn, 0);
 186         if (irq == NO_IRQ) {
 187                 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
 188                 rv = -EBUSY;
 189                 goto err_irq;
 190         }
 191
 192         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 193         if (!hcd->regs) {
 194                 printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
 195                 rv = -ENOMEM;
 196                 goto err_ioremap;
 197         }
 198
 199         ehci = hcd_to_ehci(hcd);
 200
 201         /* This core always has big-endian register interface and uses
 202          * big-endian memory descriptors.
 203          */
 204         ehci->big_endian_mmio = 1;
 205         ehci->big_endian_desc = 1;
 206
 207         /* Check whether the FS support option is selected in the hardware.
 208          */
 209         value = (int *)of_get_property(dn, "xlnx,support-usb-fs", NULL);
 210         if (value && (*value == 1)) {
 211                 ehci_dbg(ehci, "USB host controller supports FS devices\n");
 212                 hcd->has_tt = 1;
 213         } else {
 214                 ehci_dbg(ehci,
 215                         "USB host controller is HS only\n");
 216                 hcd->has_tt = 0;
 217         }
 218
 219         /* Debug registers are at the first 0x100 region
 220          */
 221         ehci->caps = hcd->regs + 0x100;
 222         ehci->regs = hcd->regs + 0x100 +
 223                         HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
 224
 225         /* cache this readonly data; minimize chip reads */
 226         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 227
 228         rv = usb_add_hcd(hcd, irq, 0);
 229         if (rv == 0)
 230                 return 0;
 231
 232         iounmap(hcd->regs);
 233
 234 err_ioremap:
 235 err_irq:
 236         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 237 err_rmr:
 238         usb_put_hcd(hcd);
 239
 240         return rv;
 241 }
 242
 243 /**
 244  * ehci_hcd_xilinx_of_remove - shutdown hcd and release resources
 245  * @op:         pointer to of_device structure that is to be removed
 246  *
 247  * Remove the hcd structure, and release resources that has been requested
 248  * during probe.
 249  */
 250 static int ehci_hcd_xilinx_of_remove(struct of_device *op)
 251 {
 252         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 253         dev_set_drvdata(&op->dev, NULL);
 254
 255         dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n");
 256
 257         usb_remove_hcd(hcd);
 258
 259         iounmap(hcd->regs);
 260         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 261
 262         usb_put_hcd(hcd);
 263
 264         return 0;
 265 }
 266
 267 /**
 268  * ehci_hcd_xilinx_of_shutdown - shutdown the hcd
 269  * @op:         pointer to of_device structure that is to be removed
 270  *
 271  * Properly shutdown the hcd, call driver's shutdown routine.
 272  */
 273 static int ehci_hcd_xilinx_of_shutdown(struct of_device *op)
 274 {
 275         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 276
 277         if (hcd->driver->shutdown)
 278                 hcd->driver->shutdown(hcd);
 279
 280         return 0;
 281 }
 282
 283
 284 static const struct of_device_id ehci_hcd_xilinx_of_match[] = {
 285                 {.compatible = "xlnx,xps-usb-host-1.00.a",},
 286         {},
 287 };
 288 MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match);
 289
 290 static struct of_platform_driver ehci_hcd_xilinx_of_driver = {
 291         .name           = "xilinx-of-ehci",
 292         .match_table    = ehci_hcd_xilinx_of_match,
 293         .probe          = ehci_hcd_xilinx_of_probe,
 294         .remove         = ehci_hcd_xilinx_of_remove,
 295         .shutdown       = ehci_hcd_xilinx_of_shutdown,
 296         .driver         = {
 297                 .name   = "xilinx-of-ehci",
 298                 .owner  = THIS_MODULE,
 299         },
 300 };