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) {
  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
  69         if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
  70                 /*
  71                  * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
  72                  * As HSIC is always HS, this should be safe for others.
  73                  */
  74                 hw_port_test_set(ci, 5);
  75                 hw_port_test_set(ci, 0);
  76         }
  77         return 0;
  78 };
  79
  80 static const struct ehci_driver_overrides ehci_ci_overrides = {
  81         .extra_priv_size = sizeof(struct ehci_ci_priv),
  82         .port_power      = ehci_ci_portpower,
  83 };
  84
  85 static irqreturn_t host_irq(struct ci_hdrc *ci)
  86 {
  87         return usb_hcd_irq(ci->irq, ci->hcd);
  88 }
  89
  90 static int host_start(struct ci_hdrc *ci)
  91 {
  92         struct usb_hcd *hcd;
  93         struct ehci_hcd *ehci;
  94         struct ehci_ci_priv *priv;
  95         int ret;
  96
  97         if (usb_disabled())
  98                 return -ENODEV;
  99
 100         hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
 101         if (!hcd)
 102                 return -ENOMEM;
 103
 104         dev_set_drvdata(ci->dev, ci);
 105         hcd->rsrc_start = ci->hw_bank.phys;
 106         hcd->rsrc_len = ci->hw_bank.size;
 107         hcd->regs = ci->hw_bank.abs;
 108         hcd->has_tt = 1;
 109
 110         hcd->power_budget = ci->platdata->power_budget;
 111         hcd->tpl_support = ci->platdata->tpl_support;
 112         if (ci->phy)
 113                 hcd->phy = ci->phy;
 114         else
 115                 hcd->usb_phy = ci->usb_phy;
 116
 117         ehci = hcd_to_ehci(hcd);
 118         ehci->caps = ci->hw_bank.cap;
 119         ehci->has_hostpc = ci->hw_bank.lpm;
 120         ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
 121         ehci->imx28_write_fix = ci->imx28_write_fix;
 122
 123         priv = (struct ehci_ci_priv *)ehci->priv;
 124         priv->reg_vbus = NULL;
 125
 126         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
 127                 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
 128                         ret = regulator_enable(ci->platdata->reg_vbus);
 129                         if (ret) {
 130                                 dev_err(ci->dev,
 131                                 "Failed to enable vbus regulator, ret=%d\n",
 132                                                                         ret);
 133                                 goto put_hcd;
 134                         }
 135                 } else {
 136                         priv->reg_vbus = ci->platdata->reg_vbus;
 137                 }
 138         }
 139
 140         ret = usb_add_hcd(hcd, 0, 0);
 141         if (ret) {
 142                 goto disable_reg;
 143         } else {
 144                 struct usb_otg *otg = &ci->otg;
 145
 146                 ci->hcd = hcd;
 147
 148                 if (ci_otg_is_fsm_mode(ci)) {
 149                         otg->host = &hcd->self;
 150                         hcd->self.otg_port = 1;
 151                 }
 152         }
 153
 154         ci_platform_configure(ci);
 155
 156         return ret;
 157
 158 disable_reg:
 159         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 160                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 161                 regulator_disable(ci->platdata->reg_vbus);
 162 put_hcd:
 163         usb_put_hcd(hcd);
 164
 165         return ret;
 166 }
 167
 168 static void host_stop(struct ci_hdrc *ci)
 169 {
 170         struct usb_hcd *hcd = ci->hcd;
 171
 172         if (hcd) {
 173                 usb_remove_hcd(hcd);
 174                 usb_put_hcd(hcd);
 175                 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 176                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 177                                 regulator_disable(ci->platdata->reg_vbus);
 178         }
 179 }
 180
 181
 182 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 183 {
 184         if (ci->role == CI_ROLE_HOST && ci->hcd)
 185                 host_stop(ci);
 186 }
 187
 188 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
 189 {
 190         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 191         int port;
 192         u32 tmp;
 193
 194         int ret = orig_bus_suspend(hcd);
 195
 196         if (ret)
 197                 return ret;
 198
 199         port = HCS_N_PORTS(ehci->hcs_params);
 200         while (port--) {
 201                 u32 __iomem *reg = &ehci->regs->port_status[port];
 202                 u32 portsc = ehci_readl(ehci, reg);
 203
 204                 if (portsc & PORT_CONNECT) {
 205                         /*
 206                          * For chipidea, the resume signal will be ended
 207                          * automatically, so for remote wakeup case, the
 208                          * usbcmd.rs may not be set before the resume has
 209                          * ended if other resume paths consumes too much
 210                          * time (~24ms), in that case, the SOF will not
 211                          * send out within 3ms after resume ends, then the
 212                          * high speed device will enter full speed mode.
 213                          */
 214
 215                         tmp = ehci_readl(ehci, &ehci->regs->command);
 216                         tmp |= CMD_RUN;
 217                         ehci_writel(ehci, tmp, &ehci->regs->command);
 218                         /*
 219                          * It needs a short delay between set RS bit and PHCD.
 220                          */
 221                         usleep_range(150, 200);
 222                         break;
 223                 }
 224         }
 225
 226         return 0;
 227 }
 228
 229 int ci_hdrc_host_init(struct ci_hdrc *ci)
 230 {
 231         struct ci_role_driver *rdrv;
 232
 233         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 234                 return -ENXIO;
 235
 236         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 237         if (!rdrv)
 238                 return -ENOMEM;
 239
 240         rdrv->start     = host_start;
 241         rdrv->stop      = host_stop;
 242         rdrv->irq       = host_irq;
 243         rdrv->name      = "host";
 244         ci->roles[CI_ROLE_HOST] = rdrv;
 245
 246         return 0;
 247 }
 248
 249 void ci_hdrc_host_driver_init(void)
 250 {
 251         ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
 252         orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
 253         ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
 254 }