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 static int (*orig_bus_suspend)(struct usb_hcd *hcd);
  37
  38 struct ehci_ci_priv {
  39         struct regulator *reg_vbus;
  40 };
  41
  42 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
  43 {
  44         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  45         struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
  46         struct device *dev = hcd->self.controller;
  47         struct ci_hdrc *ci = dev_get_drvdata(dev);
  48         int ret = 0;
  49         int port = HCS_N_PORTS(ehci->hcs_params);
  50
  51         if (priv->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
  52                 if (port > 1) {
  53                         dev_warn(dev,
  54                                 "Not support multi-port regulator control\n");
  55                         return 0;
  56                 }
  57                 if (enable)
  58                         ret = regulator_enable(priv->reg_vbus);
  59                 else
  60                         ret = regulator_disable(priv->reg_vbus);
  61                 if (ret) {
  62                         dev_err(dev,
  63                                 "Failed to %s vbus regulator, ret=%d\n",
  64                                 enable ? "enable" : "disable", ret);
  65                         return ret;
  66                 }
  67         }
  68         return 0;
  69 };
  70
  71 static const struct ehci_driver_overrides ehci_ci_overrides = {
  72         .extra_priv_size = sizeof(struct ehci_ci_priv),
  73         .port_power      = ehci_ci_portpower,
  74 };
  75
  76 static irqreturn_t host_irq(struct ci_hdrc *ci)
  77 {
  78         return usb_hcd_irq(ci->irq, ci->hcd);
  79 }
  80
  81 static int host_start(struct ci_hdrc *ci)
  82 {
  83         struct usb_hcd *hcd;
  84         struct ehci_hcd *ehci;
  85         struct ehci_ci_priv *priv;
  86         int ret;
  87
  88         if (usb_disabled())
  89                 return -ENODEV;
  90
  91         hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
  92         if (!hcd)
  93                 return -ENOMEM;
  94
  95         dev_set_drvdata(ci->dev, ci);
  96         hcd->rsrc_start = ci->hw_bank.phys;
  97         hcd->rsrc_len = ci->hw_bank.size;
  98         hcd->regs = ci->hw_bank.abs;
  99         hcd->has_tt = 1;
 100
 101         hcd->power_budget = ci->platdata->power_budget;
 102         hcd->tpl_support = ci->platdata->tpl_support;
 103         if (ci->phy)
 104                 hcd->phy = ci->phy;
 105         else
 106                 hcd->usb_phy = ci->usb_phy;
 107
 108         ehci = hcd_to_ehci(hcd);
 109         ehci->caps = ci->hw_bank.cap;
 110         ehci->has_hostpc = ci->hw_bank.lpm;
 111         ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
 112         ehci->imx28_write_fix = ci->imx28_write_fix;
 113
 114         priv = (struct ehci_ci_priv *)ehci->priv;
 115         priv->reg_vbus = NULL;
 116
 117         if (ci->platdata->reg_vbus)
 118                 priv->reg_vbus = ci->platdata->reg_vbus;
 119
 120         ret = usb_add_hcd(hcd, 0, 0);
 121         if (ret) {
 122                 goto put_hcd;
 123         } else {
 124                 struct usb_otg *otg = &ci->otg;
 125
 126                 ci->hcd = hcd;
 127
 128                 if (ci_otg_is_fsm_mode(ci)) {
 129                         otg->host = &hcd->self;
 130                         hcd->self.otg_port = 1;
 131                 }
 132         }
 133
 134         if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
 135                 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
 136
 137         if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED)
 138                 hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
 139
 140         return ret;
 141
 142 put_hcd:
 143         usb_put_hcd(hcd);
 144
 145         return ret;
 146 }
 147
 148 static void host_stop(struct ci_hdrc *ci)
 149 {
 150         struct usb_hcd *hcd = ci->hcd;
 151
 152         if (hcd) {
 153                 usb_remove_hcd(hcd);
 154                 usb_put_hcd(hcd);
 155         }
 156 }
 157
 158
 159 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 160 {
 161         if (ci->role == CI_ROLE_HOST && ci->hcd)
 162                 host_stop(ci);
 163 }
 164
 165 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
 166 {
 167         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 168         int port;
 169         u32 tmp;
 170
 171         int ret = orig_bus_suspend(hcd);
 172
 173         if (ret)
 174                 return ret;
 175
 176         port = HCS_N_PORTS(ehci->hcs_params);
 177         while (port--) {
 178                 u32 __iomem *reg = &ehci->regs->port_status[port];
 179                 u32 portsc = ehci_readl(ehci, reg);
 180
 181                 if (portsc & PORT_CONNECT) {
 182                         /*
 183                          * For chipidea, the resume signal will be ended
 184                          * automatically, so for remote wakeup case, the
 185                          * usbcmd.rs may not be set before the resume has
 186                          * ended if other resume paths consumes too much
 187                          * time (~24ms), in that case, the SOF will not
 188                          * send out within 3ms after resume ends, then the
 189                          * high speed device will enter full speed mode.
 190                          */
 191
 192                         tmp = ehci_readl(ehci, &ehci->regs->command);
 193                         tmp |= CMD_RUN;
 194                         ehci_writel(ehci, tmp, &ehci->regs->command);
 195                         /*
 196                          * It needs a short delay between set RS bit and PHCD.
 197                          */
 198                         usleep_range(150, 200);
 199                         break;
 200                 }
 201         }
 202
 203         return 0;
 204 }
 205
 206 int ci_hdrc_host_init(struct ci_hdrc *ci)
 207 {
 208         struct ci_role_driver *rdrv;
 209
 210         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 211                 return -ENXIO;
 212
 213         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 214         if (!rdrv)
 215                 return -ENOMEM;
 216
 217         rdrv->start     = host_start;
 218         rdrv->stop      = host_stop;
 219         rdrv->irq       = host_irq;
 220         rdrv->name      = "host";
 221         ci->roles[CI_ROLE_HOST] = rdrv;
 222
 223         ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
 224         orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
 225         ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
 226
 227         return 0;
 228 }