drivers/usb/host/ehci-grlib.c

   1 /*
   2  * Driver for Aeroflex Gaisler GRLIB GRUSBHC EHCI host controller
   3  *
   4  * GRUSBHC is typically found on LEON/GRLIB SoCs
   5  *
   6  * (c) Jan Andersson <jan@gaisler.com>
   7  *
   8  * Based on ehci-ppc-of.c which is:
   9  * (c) Valentine Barshak <vbarshak@ru.mvista.com>
  10  * and in turn based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
  11  * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the
  15  * Free Software Foundation; either version 2 of the License, or (at your
  16  * option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  20  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  21  * for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software Foundation,
  25  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28
  29 #include <linux/signal.h>
  30
  31 #include <linux/of_irq.h>
  32 #include <linux/of_address.h>
  33 #include <linux/of_platform.h>
  34
  35 #define GRUSBHC_HCIVERSION 0x0100 /* Known value of cap. reg. HCIVERSION */
  36
  37 /* called during probe() after chip reset completes */
  38 static int ehci_grlib_setup(struct usb_hcd *hcd)
  39 {
  40         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  41         int             retval;
  42
  43         retval = ehci_setup(hcd);
  44         if (retval)
  45                 return retval;
  46
  47         ehci_port_power(ehci, 1);
  48
  49         return retval;
  50 }
  51
  52
  53 static const struct hc_driver ehci_grlib_hc_driver = {
  54         .description            = hcd_name,
  55         .product_desc           = "GRLIB GRUSBHC EHCI",
  56         .hcd_priv_size          = sizeof(struct ehci_hcd),
  57
  58         /*
  59          * generic hardware linkage
  60          */
  61         .irq                    = ehci_irq,
  62         .flags                  = HCD_MEMORY | HCD_USB2,
  63
  64         /*
  65          * basic lifecycle operations
  66          */
  67         .reset                  = ehci_grlib_setup,
  68         .start                  = ehci_run,
  69         .stop                   = ehci_stop,
  70         .shutdown               = ehci_shutdown,
  71
  72         /*
  73          * managing i/o requests and associated device resources
  74          */
  75         .urb_enqueue            = ehci_urb_enqueue,
  76         .urb_dequeue            = ehci_urb_dequeue,
  77         .endpoint_disable       = ehci_endpoint_disable,
  78         .endpoint_reset         = ehci_endpoint_reset,
  79
  80         /*
  81          * scheduling support
  82          */
  83         .get_frame_number       = ehci_get_frame,
  84
  85         /*
  86          * root hub support
  87          */
  88         .hub_status_data        = ehci_hub_status_data,
  89         .hub_control            = ehci_hub_control,
  90 #ifdef  CONFIG_PM
  91         .bus_suspend            = ehci_bus_suspend,
  92         .bus_resume             = ehci_bus_resume,
  93 #endif
  94         .relinquish_port        = ehci_relinquish_port,
  95         .port_handed_over       = ehci_port_handed_over,
  96
  97         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  98 };
  99
 100
 101 static int __devinit ehci_hcd_grlib_probe(struct platform_device *op)
 102 {
 103         struct device_node *dn = op->dev.of_node;
 104         struct usb_hcd *hcd;
 105         struct ehci_hcd *ehci = NULL;
 106         struct resource res;
 107         u32 hc_capbase;
 108         int irq;
 109         int rv;
 110
 111         if (usb_disabled())
 112                 return -ENODEV;
 113
 114         dev_dbg(&op->dev, "initializing GRUSBHC EHCI USB Controller\n");
 115
 116         rv = of_address_to_resource(dn, 0, &res);
 117         if (rv)
 118                 return rv;
 119
 120         /* usb_create_hcd requires dma_mask != NULL */
 121         op->dev.dma_mask = &op->dev.coherent_dma_mask;
 122         hcd = usb_create_hcd(&ehci_grlib_hc_driver, &op->dev,
 123                         "GRUSBHC EHCI USB");
 124         if (!hcd)
 125                 return -ENOMEM;
 126
 127         hcd->rsrc_start = res.start;
 128         hcd->rsrc_len = resource_size(&res);
 129
 130         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 131                 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
 132                 rv = -EBUSY;
 133                 goto err_rmr;
 134         }
 135
 136         irq = irq_of_parse_and_map(dn, 0);
 137         if (irq == NO_IRQ) {
 138                 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
 139                 rv = -EBUSY;
 140                 goto err_irq;
 141         }
 142
 143         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 144         if (!hcd->regs) {
 145                 printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
 146                 rv = -ENOMEM;
 147                 goto err_ioremap;
 148         }
 149
 150         ehci = hcd_to_ehci(hcd);
 151
 152         ehci->caps = hcd->regs;
 153
 154         /* determine endianness of this implementation */
 155         hc_capbase = ehci_readl(ehci, &ehci->caps->hc_capbase);
 156         if (HC_VERSION(ehci, hc_capbase) != GRUSBHC_HCIVERSION) {
 157                 ehci->big_endian_mmio = 1;
 158                 ehci->big_endian_desc = 1;
 159                 ehci->big_endian_capbase = 1;
 160         }
 161
 162         rv = usb_add_hcd(hcd, irq, 0);
 163         if (rv)
 164                 goto err_ehci;
 165
 166         return 0;
 167
 168 err_ehci:
 169         iounmap(hcd->regs);
 170 err_ioremap:
 171         irq_dispose_mapping(irq);
 172 err_irq:
 173         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 174 err_rmr:
 175         usb_put_hcd(hcd);
 176
 177         return rv;
 178 }
 179
 180
 181 static int ehci_hcd_grlib_remove(struct platform_device *op)
 182 {
 183         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 184
 185         dev_set_drvdata(&op->dev, NULL);
 186
 187         dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n");
 188
 189         usb_remove_hcd(hcd);
 190
 191         iounmap(hcd->regs);
 192         irq_dispose_mapping(hcd->irq);
 193         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 194
 195         usb_put_hcd(hcd);
 196
 197         return 0;
 198 }
 199
 200
 201 static void ehci_hcd_grlib_shutdown(struct platform_device *op)
 202 {
 203         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 204
 205         if (hcd->driver->shutdown)
 206                 hcd->driver->shutdown(hcd);
 207 }
 208
 209
 210 static const struct of_device_id ehci_hcd_grlib_of_match[] = {
 211         {
 212                 .name = "GAISLER_EHCI",
 213          },
 214         {
 215                 .name = "01_026",
 216          },
 217         {},
 218 };
 219 MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match);
 220
 221
 222 static struct platform_driver ehci_grlib_driver = {
 223         .probe          = ehci_hcd_grlib_probe,
 224         .remove         = ehci_hcd_grlib_remove,
 225         .shutdown       = ehci_hcd_grlib_shutdown,
 226         .driver = {
 227                 .name = "grlib-ehci",
 228                 .owner = THIS_MODULE,
 229                 .of_match_table = ehci_hcd_grlib_of_match,
 230         },
 231 };