1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * host.c - ChipIdea USB host controller driver 4 * 5 * Copyright (c) 2012 Intel Corporation 6 * 7 * Author: Alexander Shishkin 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 23 #include <linux/kernel.h> 24 #include <linux/io.h> 25 #include <linux/usb.h> 26 #include <linux/usb/hcd.h> 27 #include <linux/usb/chipidea.h> 28 #include <linux/regulator/consumer.h> 29 30 #include "../host/ehci.h" 31 32 #include "ci.h" 33 #include "bits.h" 34 #include "host.h" 35 36 static struct hc_driver __read_mostly ci_ehci_hc_driver; 37 static int (*orig_bus_suspend)(struct usb_hcd *hcd); 38 39 struct ehci_ci_priv { 40 struct regulator *reg_vbus; 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) { 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 } 69 70 if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) { 71 /* 72 * Marvell 28nm HSIC PHY requires forcing the port to HS mode. 73 * As HSIC is always HS, this should be safe for others. 74 */ 75 hw_port_test_set(ci, 5); 76 hw_port_test_set(ci, 0); 77 } 78 return 0; 79 }; 80 81 static int ehci_ci_reset(struct usb_hcd *hcd) 82 { 83 struct device *dev = hcd->self.controller; 84 struct ci_hdrc *ci = dev_get_drvdata(dev); 85 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 86 int ret; 87 88 ret = ehci_setup(hcd); 89 if (ret) 90 return ret; 91 92 ehci->need_io_watchdog = 0; 93 94 if (ci->platdata->notify_event) { 95 ret = ci->platdata->notify_event(ci, 96 CI_HDRC_CONTROLLER_RESET_EVENT); 97 if (ret) 98 return ret; 99 } 100 101 ci_platform_configure(ci); 102 103 return ret; 104 } 105 106 static const struct ehci_driver_overrides ehci_ci_overrides = { 107 .extra_priv_size = sizeof(struct ehci_ci_priv), 108 .port_power = ehci_ci_portpower, 109 .reset = ehci_ci_reset, 110 }; 111 112 static irqreturn_t host_irq(struct ci_hdrc *ci) 113 { 114 return usb_hcd_irq(ci->irq, ci->hcd); 115 } 116 117 static int host_start(struct ci_hdrc *ci) 118 { 119 struct usb_hcd *hcd; 120 struct ehci_hcd *ehci; 121 struct ehci_ci_priv *priv; 122 int ret; 123 124 if (usb_disabled()) 125 return -ENODEV; 126 127 hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent, 128 ci->dev, dev_name(ci->dev), NULL); 129 if (!hcd) 130 return -ENOMEM; 131 132 dev_set_drvdata(ci->dev, ci); 133 hcd->rsrc_start = ci->hw_bank.phys; 134 hcd->rsrc_len = ci->hw_bank.size; 135 hcd->regs = ci->hw_bank.abs; 136 hcd->has_tt = 1; 137 138 hcd->power_budget = ci->platdata->power_budget; 139 hcd->tpl_support = ci->platdata->tpl_support; 140 if (ci->phy) 141 hcd->phy = ci->phy; 142 else 143 hcd->usb_phy = ci->usb_phy; 144 145 ehci = hcd_to_ehci(hcd); 146 ehci->caps = ci->hw_bank.cap; 147 ehci->has_hostpc = ci->hw_bank.lpm; 148 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm; 149 ehci->imx28_write_fix = ci->imx28_write_fix; 150 151 priv = (struct ehci_ci_priv *)ehci->priv; 152 priv->reg_vbus = NULL; 153 154 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) { 155 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) { 156 ret = regulator_enable(ci->platdata->reg_vbus); 157 if (ret) { 158 dev_err(ci->dev, 159 "Failed to enable vbus regulator, ret=%d\n", 160 ret); 161 goto put_hcd; 162 } 163 } else { 164 priv->reg_vbus = ci->platdata->reg_vbus; 165 } 166 } 167 168 ret = usb_add_hcd(hcd, 0, 0); 169 if (ret) { 170 goto disable_reg; 171 } else { 172 struct usb_otg *otg = &ci->otg; 173 174 ci->hcd = hcd; 175 176 if (ci_otg_is_fsm_mode(ci)) { 177 otg->host = &hcd->self; 178 hcd->self.otg_port = 1; 179 } 180 } 181 182 return ret; 183 184 disable_reg: 185 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) && 186 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON)) 187 regulator_disable(ci->platdata->reg_vbus); 188 put_hcd: 189 usb_put_hcd(hcd); 190 191 return ret; 192 } 193 194 static void host_stop(struct ci_hdrc *ci) 195 { 196 struct usb_hcd *hcd = ci->hcd; 197 198 if (hcd) { 199 if (ci->platdata->notify_event) 200 ci->platdata->notify_event(ci, 201 CI_HDRC_CONTROLLER_STOPPED_EVENT); 202 usb_remove_hcd(hcd); 203 ci->role = CI_ROLE_END; 204 synchronize_irq(ci->irq); 205 usb_put_hcd(hcd); 206 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) && 207 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON)) 208 regulator_disable(ci->platdata->reg_vbus); 209 } 210 ci->hcd = NULL; 211 ci->otg.host = NULL; 212 } 213 214 215 void ci_hdrc_host_destroy(struct ci_hdrc *ci) 216 { 217 if (ci->role == CI_ROLE_HOST && ci->hcd) 218 host_stop(ci); 219 } 220 221 static int ci_ehci_bus_suspend(struct usb_hcd *hcd) 222 { 223 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 224 int port; 225 u32 tmp; 226 227 int ret = orig_bus_suspend(hcd); 228 229 if (ret) 230 return ret; 231 232 port = HCS_N_PORTS(ehci->hcs_params); 233 while (port--) { 234 u32 __iomem *reg = &ehci->regs->port_status[port]; 235 u32 portsc = ehci_readl(ehci, reg); 236 237 if (portsc & PORT_CONNECT) { 238 /* 239 * For chipidea, the resume signal will be ended 240 * automatically, so for remote wakeup case, the 241 * usbcmd.rs may not be set before the resume has 242 * ended if other resume paths consumes too much 243 * time (~24ms), in that case, the SOF will not 244 * send out within 3ms after resume ends, then the 245 * high speed device will enter full speed mode. 246 */ 247 248 tmp = ehci_readl(ehci, &ehci->regs->command); 249 tmp |= CMD_RUN; 250 ehci_writel(ehci, tmp, &ehci->regs->command); 251 /* 252 * It needs a short delay between set RS bit and PHCD. 253 */ 254 usleep_range(150, 200); 255 break; 256 } 257 } 258 259 return 0; 260 } 261 262 int ci_hdrc_host_init(struct ci_hdrc *ci) 263 { 264 struct ci_role_driver *rdrv; 265 266 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC)) 267 return -ENXIO; 268 269 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL); 270 if (!rdrv) 271 return -ENOMEM; 272 273 rdrv->start = host_start; 274 rdrv->stop = host_stop; 275 rdrv->irq = host_irq; 276 rdrv->name = "host"; 277 ci->roles[CI_ROLE_HOST] = rdrv; 278 279 return 0; 280 } 281 282 void ci_hdrc_host_driver_init(void) 283 { 284 ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides); 285 orig_bus_suspend = ci_ehci_hc_driver.bus_suspend; 286 ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend; 287 } 288