drivers/usb/chipidea/host.c

   1 /*
   2  * host.c - ChipIdea USB host controller driver
   3  *
   4  * Copyright (c) 2012 Intel Corporation
   5  *
   6  * Author: Alexander Shishkin
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/io.h>
  24 #include <linux/usb.h>
  25 #include <linux/usb/hcd.h>
  26 #include <linux/usb/chipidea.h>
  27
  28 #include "../host/ehci.h"
  29
  30 #include "ci.h"
  31 #include "bits.h"
  32 #include "host.h"
  33
  34 static struct hc_driver __read_mostly ci_ehci_hc_driver;
  35
  36 static irqreturn_t host_irq(struct ci13xxx *ci)
  37 {
  38         return usb_hcd_irq(ci->irq, ci->hcd);
  39 }
  40
  41 static int host_start(struct ci13xxx *ci)
  42 {
  43         struct usb_hcd *hcd;
  44         struct ehci_hcd *ehci;
  45         int ret;
  46
  47         if (usb_disabled())
  48                 return -ENODEV;
  49
  50         hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
  51         if (!hcd)
  52                 return -ENOMEM;
  53
  54         dev_set_drvdata(ci->dev, ci);
  55         hcd->rsrc_start = ci->hw_bank.phys;
  56         hcd->rsrc_len = ci->hw_bank.size;
  57         hcd->regs = ci->hw_bank.abs;
  58         hcd->has_tt = 1;
  59
  60         hcd->power_budget = ci->platdata->power_budget;
  61         hcd->phy = ci->transceiver;
  62
  63         ehci = hcd_to_ehci(hcd);
  64         ehci->caps = ci->hw_bank.cap;
  65         ehci->has_hostpc = ci->hw_bank.lpm;
  66
  67         ret = usb_add_hcd(hcd, 0, 0);
  68         if (ret)
  69                 usb_put_hcd(hcd);
  70         else
  71                 ci->hcd = hcd;
  72
  73         if (ci->platdata->flags & CI13XXX_DISABLE_STREAMING)
  74                 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
  75
  76         return ret;
  77 }
  78
  79 static void host_stop(struct ci13xxx *ci)
  80 {
  81         struct usb_hcd *hcd = ci->hcd;
  82
  83         usb_remove_hcd(hcd);
  84         usb_put_hcd(hcd);
  85 }
  86
  87 int ci_hdrc_host_init(struct ci13xxx *ci)
  88 {
  89         struct ci_role_driver *rdrv;
  90
  91         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
  92                 return -ENXIO;
  93
  94         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
  95         if (!rdrv)
  96                 return -ENOMEM;
  97
  98         rdrv->start     = host_start;
  99         rdrv->stop      = host_stop;
 100         rdrv->irq       = host_irq;
 101         rdrv->name      = "host";
 102         ci->roles[CI_ROLE_HOST] = rdrv;
 103
 104         ehci_init_driver(&ci_ehci_hc_driver, NULL);
 105
 106         return 0;
 107 }