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 static const struct hc_driver ehci_grlib_hc_driver = {
  38         .description            = hcd_name,
  39         .product_desc           = "GRLIB GRUSBHC EHCI",
  40         .hcd_priv_size          = sizeof(struct ehci_hcd),
  41
  42         /*
  43          * generic hardware linkage
  44          */
  45         .irq                    = ehci_irq,
  46         .flags                  = HCD_MEMORY | HCD_USB2,
  47
  48         /*
  49          * basic lifecycle operations
  50          */
  51         .reset                  = ehci_setup,
  52         .start                  = ehci_run,
  53         .stop                   = ehci_stop,
  54         .shutdown               = ehci_shutdown,
  55
  56         /*
  57          * managing i/o requests and associated device resources
  58          */
  59         .urb_enqueue            = ehci_urb_enqueue,
  60         .urb_dequeue            = ehci_urb_dequeue,
  61         .endpoint_disable       = ehci_endpoint_disable,
  62         .endpoint_reset         = ehci_endpoint_reset,
  63
  64         /*
  65          * scheduling support
  66          */
  67         .get_frame_number       = ehci_get_frame,
  68
  69         /*
  70          * root hub support
  71          */
  72         .hub_status_data        = ehci_hub_status_data,
  73         .hub_control            = ehci_hub_control,
  74 #ifdef  CONFIG_PM
  75         .bus_suspend            = ehci_bus_suspend,
  76         .bus_resume             = ehci_bus_resume,
  77 #endif
  78         .relinquish_port        = ehci_relinquish_port,
  79         .port_handed_over       = ehci_port_handed_over,
  80
  81         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  82 };
  83
  84
  85 static int ehci_hcd_grlib_probe(struct platform_device *op)
  86 {
  87         struct device_node *dn = op->dev.of_node;
  88         struct usb_hcd *hcd;
  89         struct ehci_hcd *ehci = NULL;
  90         struct resource res;
  91         u32 hc_capbase;
  92         int irq;
  93         int rv;
  94
  95         if (usb_disabled())
  96                 return -ENODEV;
  97
  98         dev_dbg(&op->dev, "initializing GRUSBHC EHCI USB Controller\n");
  99
 100         rv = of_address_to_resource(dn, 0, &res);
 101         if (rv)
 102                 return rv;
 103
 104         /* usb_create_hcd requires dma_mask != NULL */
 105         op->dev.dma_mask = &op->dev.coherent_dma_mask;
 106         hcd = usb_create_hcd(&ehci_grlib_hc_driver, &op->dev,
 107                         "GRUSBHC EHCI USB");
 108         if (!hcd)
 109                 return -ENOMEM;
 110
 111         hcd->rsrc_start = res.start;
 112         hcd->rsrc_len = resource_size(&res);
 113
 114         irq = irq_of_parse_and_map(dn, 0);
 115         if (irq == NO_IRQ) {
 116                 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
 117                 rv = -EBUSY;
 118                 goto err_irq;
 119         }
 120
 121         hcd->regs = devm_request_and_ioremap(&op->dev, &res);
 122         if (!hcd->regs) {
 123                 pr_err("%s: devm_request_and_ioremap failed\n", __FILE__);
 124                 rv = -ENOMEM;
 125                 goto err_ioremap;
 126         }
 127
 128         ehci = hcd_to_ehci(hcd);
 129
 130         ehci->caps = hcd->regs;
 131
 132         /* determine endianness of this implementation */
 133         hc_capbase = ehci_readl(ehci, &ehci->caps->hc_capbase);
 134         if (HC_VERSION(ehci, hc_capbase) != GRUSBHC_HCIVERSION) {
 135                 ehci->big_endian_mmio = 1;
 136                 ehci->big_endian_desc = 1;
 137                 ehci->big_endian_capbase = 1;
 138         }
 139
 140         rv = usb_add_hcd(hcd, irq, 0);
 141         if (rv)
 142                 goto err_ioremap;
 143
 144         return 0;
 145
 146 err_ioremap:
 147         irq_dispose_mapping(irq);
 148 err_irq:
 149         usb_put_hcd(hcd);
 150
 151         return rv;
 152 }
 153
 154
 155 static int ehci_hcd_grlib_remove(struct platform_device *op)
 156 {
 157         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 158
 159         dev_set_drvdata(&op->dev, NULL);
 160
 161         dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n");
 162
 163         usb_remove_hcd(hcd);
 164
 165         irq_dispose_mapping(hcd->irq);
 166
 167         usb_put_hcd(hcd);
 168
 169         return 0;
 170 }
 171
 172
 173 static void ehci_hcd_grlib_shutdown(struct platform_device *op)
 174 {
 175         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 176
 177         if (hcd->driver->shutdown)
 178                 hcd->driver->shutdown(hcd);
 179 }
 180
 181
 182 static const struct of_device_id ehci_hcd_grlib_of_match[] = {
 183         {
 184                 .name = "GAISLER_EHCI",
 185          },
 186         {
 187                 .name = "01_026",
 188          },
 189         {},
 190 };
 191 MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match);
 192
 193
 194 static struct platform_driver ehci_grlib_driver = {
 195         .probe          = ehci_hcd_grlib_probe,
 196         .remove         = ehci_hcd_grlib_remove,
 197         .shutdown       = ehci_hcd_grlib_shutdown,
 198         .driver = {
 199                 .name = "grlib-ehci",
 200                 .owner = THIS_MODULE,
 201                 .of_match_table = ehci_hcd_grlib_of_match,
 202         },
 203 };