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 int ehci_ci_reset(struct usb_hcd *hcd)
  81 {
  82         struct device *dev = hcd->self.controller;
  83         struct ci_hdrc *ci = dev_get_drvdata(dev);
  84         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  85         int ret;
  86
  87         ret = ehci_setup(hcd);
  88         if (ret)
  89                 return ret;
  90
  91         ehci->need_io_watchdog = 0;
  92
  93         ci_platform_configure(ci);
  94
  95         return ret;
  96 }
  97
  98 static const struct ehci_driver_overrides ehci_ci_overrides = {
  99         .extra_priv_size = sizeof(struct ehci_ci_priv),
 100         .port_power      = ehci_ci_portpower,
 101         .reset           = ehci_ci_reset,
 102 };
 103
 104 static irqreturn_t host_irq(struct ci_hdrc *ci)
 105 {
 106         return usb_hcd_irq(ci->irq, ci->hcd);
 107 }
 108
 109 static int host_start(struct ci_hdrc *ci)
 110 {
 111         struct usb_hcd *hcd;
 112         struct ehci_hcd *ehci;
 113         struct ehci_ci_priv *priv;
 114         int ret;
 115
 116         if (usb_disabled())
 117                 return -ENODEV;
 118
 119         hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
 120         if (!hcd)
 121                 return -ENOMEM;
 122
 123         dev_set_drvdata(ci->dev, ci);
 124         hcd->rsrc_start = ci->hw_bank.phys;
 125         hcd->rsrc_len = ci->hw_bank.size;
 126         hcd->regs = ci->hw_bank.abs;
 127         hcd->has_tt = 1;
 128
 129         hcd->power_budget = ci->platdata->power_budget;
 130         hcd->tpl_support = ci->platdata->tpl_support;
 131         if (ci->phy)
 132                 hcd->phy = ci->phy;
 133         else
 134                 hcd->usb_phy = ci->usb_phy;
 135
 136         ehci = hcd_to_ehci(hcd);
 137         ehci->caps = ci->hw_bank.cap;
 138         ehci->has_hostpc = ci->hw_bank.lpm;
 139         ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
 140         ehci->imx28_write_fix = ci->imx28_write_fix;
 141
 142         priv = (struct ehci_ci_priv *)ehci->priv;
 143         priv->reg_vbus = NULL;
 144
 145         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
 146                 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
 147                         ret = regulator_enable(ci->platdata->reg_vbus);
 148                         if (ret) {
 149                                 dev_err(ci->dev,
 150                                 "Failed to enable vbus regulator, ret=%d\n",
 151                                                                         ret);
 152                                 goto put_hcd;
 153                         }
 154                 } else {
 155                         priv->reg_vbus = ci->platdata->reg_vbus;
 156                 }
 157         }
 158
 159         ret = usb_add_hcd(hcd, 0, 0);
 160         if (ret) {
 161                 goto disable_reg;
 162         } else {
 163                 struct usb_otg *otg = &ci->otg;
 164
 165                 ci->hcd = hcd;
 166
 167                 if (ci_otg_is_fsm_mode(ci)) {
 168                         otg->host = &hcd->self;
 169                         hcd->self.otg_port = 1;
 170                 }
 171         }
 172
 173         return ret;
 174
 175 disable_reg:
 176         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 177                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 178                 regulator_disable(ci->platdata->reg_vbus);
 179 put_hcd:
 180         usb_put_hcd(hcd);
 181
 182         return ret;
 183 }
 184
 185 static void host_stop(struct ci_hdrc *ci)
 186 {
 187         struct usb_hcd *hcd = ci->hcd;
 188
 189         if (hcd) {
 190                 usb_remove_hcd(hcd);
 191                 usb_put_hcd(hcd);
 192                 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 193                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 194                                 regulator_disable(ci->platdata->reg_vbus);
 195         }
 196         ci->hcd = NULL;
 197         ci->otg.host = NULL;
 198 }
 199
 200
 201 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 202 {
 203         if (ci->role == CI_ROLE_HOST && ci->hcd)
 204                 host_stop(ci);
 205 }
 206
 207 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
 208 {
 209         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 210         int port;
 211         u32 tmp;
 212
 213         int ret = orig_bus_suspend(hcd);
 214
 215         if (ret)
 216                 return ret;
 217
 218         port = HCS_N_PORTS(ehci->hcs_params);
 219         while (port--) {
 220                 u32 __iomem *reg = &ehci->regs->port_status[port];
 221                 u32 portsc = ehci_readl(ehci, reg);
 222
 223                 if (portsc & PORT_CONNECT) {
 224                         /*
 225                          * For chipidea, the resume signal will be ended
 226                          * automatically, so for remote wakeup case, the
 227                          * usbcmd.rs may not be set before the resume has
 228                          * ended if other resume paths consumes too much
 229                          * time (~24ms), in that case, the SOF will not
 230                          * send out within 3ms after resume ends, then the
 231                          * high speed device will enter full speed mode.
 232                          */
 233
 234                         tmp = ehci_readl(ehci, &ehci->regs->command);
 235                         tmp |= CMD_RUN;
 236                         ehci_writel(ehci, tmp, &ehci->regs->command);
 237                         /*
 238                          * It needs a short delay between set RS bit and PHCD.
 239                          */
 240                         usleep_range(150, 200);
 241                         break;
 242                 }
 243         }
 244
 245         return 0;
 246 }
 247
 248 int ci_hdrc_host_init(struct ci_hdrc *ci)
 249 {
 250         struct ci_role_driver *rdrv;
 251
 252         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 253                 return -ENXIO;
 254
 255         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 256         if (!rdrv)
 257                 return -ENOMEM;
 258
 259         rdrv->start     = host_start;
 260         rdrv->stop      = host_stop;
 261         rdrv->irq       = host_irq;
 262         rdrv->name      = "host";
 263         ci->roles[CI_ROLE_HOST] = rdrv;
 264
 265         return 0;
 266 }
 267
 268 void ci_hdrc_host_driver_init(void)
 269 {
 270         ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
 271         orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
 272         ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
 273 }