kernel/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 #include <linux/err.h>
  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 | HCD_BH,
  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                 dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
 117                         __FILE__);
 118                 rv = -EBUSY;
 119                 goto err_irq;
 120         }
 121
 122         hcd->regs = devm_ioremap_resource(&op->dev, &res);
 123         if (IS_ERR(hcd->regs)) {
 124                 rv = PTR_ERR(hcd->regs);
 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         device_wakeup_enable(hcd->self.controller);
 145         return 0;
 146
 147 err_ioremap:
 148         irq_dispose_mapping(irq);
 149 err_irq:
 150         usb_put_hcd(hcd);
 151
 152         return rv;
 153 }
 154
 155
 156 static int ehci_hcd_grlib_remove(struct platform_device *op)
 157 {
 158         struct usb_hcd *hcd = platform_get_drvdata(op);
 159
 160         dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n");
 161
 162         usb_remove_hcd(hcd);
 163
 164         irq_dispose_mapping(hcd->irq);
 165
 166         usb_put_hcd(hcd);
 167
 168         return 0;
 169 }
 170
 171
 172 static const struct of_device_id ehci_hcd_grlib_of_match[] = {
 173         {
 174                 .name = "GAISLER_EHCI",
 175          },
 176         {
 177                 .name = "01_026",
 178          },
 179         {},
 180 };
 181 MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match);
 182
 183
 184 static struct platform_driver ehci_grlib_driver = {
 185         .probe          = ehci_hcd_grlib_probe,
 186         .remove         = ehci_hcd_grlib_remove,
 187         .shutdown       = usb_hcd_platform_shutdown,
 188         .driver = {
 189                 .name = "grlib-ehci",
 190                 .of_match_table = ehci_hcd_grlib_of_match,
 191         },
 192 };