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#include <linux/regulator/consumer.h>
  28
  29#include "../host/ehci.h"
  30
  31#include "ci.h"
  32#include "bits.h"
  33#include "host.h"
  34
  35static struct hc_driver __read_mostly ci_ehci_hc_driver;
  36
  37static irqreturn_t host_irq(struct ci_hdrc *ci)
  38{
  39        return usb_hcd_irq(ci->irq, ci->hcd);
  40}
  41
  42static int host_start(struct ci_hdrc *ci)
  43{
  44        struct usb_hcd *hcd;
  45        struct ehci_hcd *ehci;
  46        int ret;
  47
  48        if (usb_disabled())
  49                return -ENODEV;
  50
  51        hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
  52        if (!hcd)
  53                return -ENOMEM;
  54
  55        dev_set_drvdata(ci->dev, ci);
  56        hcd->rsrc_start = ci->hw_bank.phys;
  57        hcd->rsrc_len = ci->hw_bank.size;
  58        hcd->regs = ci->hw_bank.abs;
  59        hcd->has_tt = 1;
  60
  61        hcd->power_budget = ci->platdata->power_budget;
  62        hcd->usb_phy = ci->transceiver;
  63        hcd->tpl_support = ci->platdata->tpl_support;
  64
  65        ehci = hcd_to_ehci(hcd);
  66        ehci->caps = ci->hw_bank.cap;
  67        ehci->has_hostpc = ci->hw_bank.lpm;
  68        ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
  69        ehci->imx28_write_fix = ci->imx28_write_fix;
  70
  71        /*
  72         * vbus is always on if host is not in OTG FSM mode,
  73         * otherwise should be controlled by OTG FSM
  74         */
  75        if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
  76                ret = regulator_enable(ci->platdata->reg_vbus);
  77                if (ret) {
  78                        dev_err(ci->dev,
  79                                "Failed to enable vbus regulator, ret=%d\n",
  80                                ret);
  81                        goto put_hcd;
  82                }
  83        }
  84
  85        ret = usb_add_hcd(hcd, 0, 0);
  86        if (ret) {
  87                goto disable_reg;
  88        } else {
  89                struct usb_otg *otg = ci->transceiver->otg;
  90
  91                ci->hcd = hcd;
  92                if (otg) {
  93                        otg->host = &hcd->self;
  94                        hcd->self.otg_port = 1;
  95                }
  96        }
  97
  98        if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
  99                hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
 100
 101        return ret;
 102
 103disable_reg:
 104        if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci))
 105                regulator_disable(ci->platdata->reg_vbus);
 106
 107put_hcd:
 108        usb_put_hcd(hcd);
 109
 110        return ret;
 111}
 112
 113static void host_stop(struct ci_hdrc *ci)
 114{
 115        struct usb_hcd *hcd = ci->hcd;
 116
 117        if (hcd) {
 118                usb_remove_hcd(hcd);
 119                usb_put_hcd(hcd);
 120                if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci))
 121                        regulator_disable(ci->platdata->reg_vbus);
 122        }
 123}
 124
 125
 126void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 127{
 128        if (ci->role == CI_ROLE_HOST && ci->hcd)
 129                host_stop(ci);
 130}
 131
 132int ci_hdrc_host_init(struct ci_hdrc *ci)
 133{
 134        struct ci_role_driver *rdrv;
 135
 136        if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 137                return -ENXIO;
 138
 139        rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 140        if (!rdrv)
 141                return -ENOMEM;
 142
 143        rdrv->start     = host_start;
 144        rdrv->stop      = host_stop;
 145        rdrv->irq       = host_irq;
 146        rdrv->name      = "host";
 147        ci->roles[CI_ROLE_HOST] = rdrv;
 148
 149        ehci_init_driver(&ci_ehci_hc_driver, NULL);
 150
 151        return 0;
 152}
 153