LXR linux/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
  34static struct hc_driver __read_mostly ci_ehci_hc_driver;
  35
  36static irqreturn_t host_irq(struct ci_hdrc *ci)
  37{
  38        return usb_hcd_irq(ci->irq, ci->hcd);
  39}
  40
  41static int host_start(struct ci_hdrc *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 & CI_HDRC_DISABLE_STREAMING)
  74                hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
  75
  76        return ret;
  77}
  78
  79static void host_stop(struct ci_hdrc *ci)
  80{
  81        struct usb_hcd *hcd = ci->hcd;
  82
  83        usb_remove_hcd(hcd);
  84        usb_put_hcd(hcd);
  85}
  86
  87int ci_hdrc_host_init(struct ci_hdrc *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}
 108