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         bool enabled;
  41 };
  42
  43 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
  44 {
  45         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  46         struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
  47         struct device *dev = hcd->self.controller;
  48         struct ci_hdrc *ci = dev_get_drvdata(dev);
  49         int ret = 0;
  50         int port = HCS_N_PORTS(ehci->hcs_params);
  51
  52         if (priv->reg_vbus && enable != priv->enabled) {
  53                 if (port > 1) {
  54                         dev_warn(dev,
  55                                 "Not support multi-port regulator control\n");
  56                         return 0;
  57                 }
  58                 if (enable)
  59                         ret = regulator_enable(priv->reg_vbus);
  60                 else
  61                         ret = regulator_disable(priv->reg_vbus);
  62                 if (ret) {
  63                         dev_err(dev,
  64                                 "Failed to %s vbus regulator, ret=%d\n",
  65                                 enable ? "enable" : "disable", ret);
  66                         return ret;
  67                 }
  68                 priv->enabled = enable;
  69         }
  70
  71         if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
  72                 /*
  73                  * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
  74                  * As HSIC is always HS, this should be safe for others.
  75                  */
  76                 hw_port_test_set(ci, 5);
  77                 hw_port_test_set(ci, 0);
  78         }
  79         return 0;
  80 };
  81
  82 static int ehci_ci_reset(struct usb_hcd *hcd)
  83 {
  84         struct device *dev = hcd->self.controller;
  85         struct ci_hdrc *ci = dev_get_drvdata(dev);
  86         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  87         int ret;
  88
  89         ret = ehci_setup(hcd);
  90         if (ret)
  91                 return ret;
  92
  93         ehci->need_io_watchdog = 0;
  94
  95         ci_platform_configure(ci);
  96
  97         return ret;
  98 }
  99
 100 static const struct ehci_driver_overrides ehci_ci_overrides = {
 101         .extra_priv_size = sizeof(struct ehci_ci_priv),
 102         .port_power      = ehci_ci_portpower,
 103         .reset           = ehci_ci_reset,
 104 };
 105
 106 static irqreturn_t host_irq(struct ci_hdrc *ci)
 107 {
 108         return usb_hcd_irq(ci->irq, ci->hcd);
 109 }
 110
 111 static int host_start(struct ci_hdrc *ci)
 112 {
 113         struct usb_hcd *hcd;
 114         struct ehci_hcd *ehci;
 115         struct ehci_ci_priv *priv;
 116         int ret;
 117
 118         if (usb_disabled())
 119                 return -ENODEV;
 120
 121         hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
 122         if (!hcd)
 123                 return -ENOMEM;
 124
 125         dev_set_drvdata(ci->dev, ci);
 126         hcd->rsrc_start = ci->hw_bank.phys;
 127         hcd->rsrc_len = ci->hw_bank.size;
 128         hcd->regs = ci->hw_bank.abs;
 129         hcd->has_tt = 1;
 130
 131         hcd->power_budget = ci->platdata->power_budget;
 132         hcd->tpl_support = ci->platdata->tpl_support;
 133         if (ci->phy)
 134                 hcd->phy = ci->phy;
 135         else
 136                 hcd->usb_phy = ci->usb_phy;
 137
 138         ehci = hcd_to_ehci(hcd);
 139         ehci->caps = ci->hw_bank.cap;
 140         ehci->has_hostpc = ci->hw_bank.lpm;
 141         ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
 142         ehci->imx28_write_fix = ci->imx28_write_fix;
 143
 144         priv = (struct ehci_ci_priv *)ehci->priv;
 145         priv->reg_vbus = NULL;
 146
 147         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
 148                 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
 149                         ret = regulator_enable(ci->platdata->reg_vbus);
 150                         if (ret) {
 151                                 dev_err(ci->dev,
 152                                 "Failed to enable vbus regulator, ret=%d\n",
 153                                                                         ret);
 154                                 goto put_hcd;
 155                         }
 156                 } else {
 157                         priv->reg_vbus = ci->platdata->reg_vbus;
 158                 }
 159         }
 160
 161         ret = usb_add_hcd(hcd, 0, 0);
 162         if (ret) {
 163                 goto disable_reg;
 164         } else {
 165                 struct usb_otg *otg = &ci->otg;
 166
 167                 ci->hcd = hcd;
 168
 169                 if (ci_otg_is_fsm_mode(ci)) {
 170                         otg->host = &hcd->self;
 171                         hcd->self.otg_port = 1;
 172                 }
 173         }
 174
 175         return ret;
 176
 177 disable_reg:
 178         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 179                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 180                 regulator_disable(ci->platdata->reg_vbus);
 181 put_hcd:
 182         usb_put_hcd(hcd);
 183
 184         return ret;
 185 }
 186
 187 static void host_stop(struct ci_hdrc *ci)
 188 {
 189         struct usb_hcd *hcd = ci->hcd;
 190
 191         if (hcd) {
 192                 usb_remove_hcd(hcd);
 193                 ci->role = CI_ROLE_END;
 194                 synchronize_irq(ci->irq);
 195                 usb_put_hcd(hcd);
 196                 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 197                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 198                                 regulator_disable(ci->platdata->reg_vbus);
 199         }
 200         ci->hcd = NULL;
 201         ci->otg.host = NULL;
 202 }
 203
 204
 205 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 206 {
 207         if (ci->role == CI_ROLE_HOST && ci->hcd)
 208                 host_stop(ci);
 209 }
 210
 211 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
 212 {
 213         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 214         int port;
 215         u32 tmp;
 216
 217         int ret = orig_bus_suspend(hcd);
 218
 219         if (ret)
 220                 return ret;
 221
 222         port = HCS_N_PORTS(ehci->hcs_params);
 223         while (port--) {
 224                 u32 __iomem *reg = &ehci->regs->port_status[port];
 225                 u32 portsc = ehci_readl(ehci, reg);
 226
 227                 if (portsc & PORT_CONNECT) {
 228                         /*
 229                          * For chipidea, the resume signal will be ended
 230                          * automatically, so for remote wakeup case, the
 231                          * usbcmd.rs may not be set before the resume has
 232                          * ended if other resume paths consumes too much
 233                          * time (~24ms), in that case, the SOF will not
 234                          * send out within 3ms after resume ends, then the
 235                          * high speed device will enter full speed mode.
 236                          */
 237
 238                         tmp = ehci_readl(ehci, &ehci->regs->command);
 239                         tmp |= CMD_RUN;
 240                         ehci_writel(ehci, tmp, &ehci->regs->command);
 241                         /*
 242                          * It needs a short delay between set RS bit and PHCD.
 243                          */
 244                         usleep_range(150, 200);
 245                         break;
 246                 }
 247         }
 248
 249         return 0;
 250 }
 251
 252 int ci_hdrc_host_init(struct ci_hdrc *ci)
 253 {
 254         struct ci_role_driver *rdrv;
 255
 256         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 257                 return -ENXIO;
 258
 259         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 260         if (!rdrv)
 261                 return -ENOMEM;
 262
 263         rdrv->start     = host_start;
 264         rdrv->stop      = host_stop;
 265         rdrv->irq       = host_irq;
 266         rdrv->name      = "host";
 267         ci->roles[CI_ROLE_HOST] = rdrv;
 268
 269         return 0;
 270 }
 271
 272 void ci_hdrc_host_driver_init(void)
 273 {
 274         ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
 275         orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
 276         ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
 277 }