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
  35 static struct hc_driver __read_mostly ci_ehci_hc_driver;
  36
  37 struct ehci_ci_priv {
  38         struct regulator *reg_vbus;
  39 };
  40
  41 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
  42 {
  43         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  44         struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
  45         struct device *dev = hcd->self.controller;
  46         struct ci_hdrc *ci = dev_get_drvdata(dev);
  47         int ret = 0;
  48         int port = HCS_N_PORTS(ehci->hcs_params);
  49
  50         if (priv->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
  51                 if (port > 1) {
  52                         dev_warn(dev,
  53                                 "Not support multi-port regulator control\n");
  54                         return 0;
  55                 }
  56                 if (enable)
  57                         ret = regulator_enable(priv->reg_vbus);
  58                 else
  59                         ret = regulator_disable(priv->reg_vbus);
  60                 if (ret) {
  61                         dev_err(dev,
  62                                 "Failed to %s vbus regulator, ret=%d\n",
  63                                 enable ? "enable" : "disable", ret);
  64                         return ret;
  65                 }
  66         }
  67         return 0;
  68 };
  69
  70 static const struct ehci_driver_overrides ehci_ci_overrides = {
  71         .extra_priv_size = sizeof(struct ehci_ci_priv),
  72         .port_power      = ehci_ci_portpower,
  73 };
  74
  75 static irqreturn_t host_irq(struct ci_hdrc *ci)
  76 {
  77         return usb_hcd_irq(ci->irq, ci->hcd);
  78 }
  79
  80 static int host_start(struct ci_hdrc *ci)
  81 {
  82         struct usb_hcd *hcd;
  83         struct ehci_hcd *ehci;
  84         struct ehci_ci_priv *priv;
  85         int ret;
  86
  87         if (usb_disabled())
  88                 return -ENODEV;
  89
  90         hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
  91         if (!hcd)
  92                 return -ENOMEM;
  93
  94         dev_set_drvdata(ci->dev, ci);
  95         hcd->rsrc_start = ci->hw_bank.phys;
  96         hcd->rsrc_len = ci->hw_bank.size;
  97         hcd->regs = ci->hw_bank.abs;
  98         hcd->has_tt = 1;
  99
 100         hcd->power_budget = ci->platdata->power_budget;
 101         hcd->usb_phy = ci->transceiver;
 102         hcd->tpl_support = ci->platdata->tpl_support;
 103
 104         ehci = hcd_to_ehci(hcd);
 105         ehci->caps = ci->hw_bank.cap;
 106         ehci->has_hostpc = ci->hw_bank.lpm;
 107         ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
 108         ehci->imx28_write_fix = ci->imx28_write_fix;
 109
 110         priv = (struct ehci_ci_priv *)ehci->priv;
 111         priv->reg_vbus = NULL;
 112
 113         if (ci->platdata->reg_vbus)
 114                 priv->reg_vbus = ci->platdata->reg_vbus;
 115
 116         ret = usb_add_hcd(hcd, 0, 0);
 117         if (ret) {
 118                 goto put_hcd;
 119         } else {
 120                 struct usb_otg *otg = ci->transceiver->otg;
 121
 122                 ci->hcd = hcd;
 123                 if (otg) {
 124                         otg->host = &hcd->self;
 125                         hcd->self.otg_port = 1;
 126                 }
 127         }
 128
 129         if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
 130                 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
 131
 132         return ret;
 133
 134 put_hcd:
 135         usb_put_hcd(hcd);
 136
 137         return ret;
 138 }
 139
 140 static void host_stop(struct ci_hdrc *ci)
 141 {
 142         struct usb_hcd *hcd = ci->hcd;
 143
 144         if (hcd) {
 145                 usb_remove_hcd(hcd);
 146                 usb_put_hcd(hcd);
 147         }
 148 }
 149
 150
 151 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 152 {
 153         if (ci->role == CI_ROLE_HOST && ci->hcd)
 154                 host_stop(ci);
 155 }
 156
 157 int ci_hdrc_host_init(struct ci_hdrc *ci)
 158 {
 159         struct ci_role_driver *rdrv;
 160
 161         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 162                 return -ENXIO;
 163
 164         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 165         if (!rdrv)
 166                 return -ENOMEM;
 167
 168         rdrv->start     = host_start;
 169         rdrv->stop      = host_stop;
 170         rdrv->irq       = host_irq;
 171         rdrv->name      = "host";
 172         ci->roles[CI_ROLE_HOST] = rdrv;
 173
 174         ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
 175
 176         return 0;
 177 }