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 10 #include <linux/kernel.h> 11 #include <linux/io.h> 12 #include <linux/usb.h> 13 #include <linux/usb/hcd.h> 14 #include <linux/usb/chipidea.h> 15 #include <linux/regulator/consumer.h> 16 17 #include "../host/ehci.h" 18 19 #include "ci.h" 20 #include "bits.h" 21 #include "host.h" 22 23 static struct hc_driver __read_mostly ci_ehci_hc_driver; 24 static int (*orig_bus_suspend)(struct usb_hcd *hcd); 25 26 struct ehci_ci_priv { 27 struct regulator *reg_vbus; 28 }; 29 30 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable) 31 { 32 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 33 struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv; 34 struct device *dev = hcd->self.controller; 35 struct ci_hdrc *ci = dev_get_drvdata(dev); 36 int ret = 0; 37 int port = HCS_N_PORTS(ehci->hcs_params); 38 39 if (priv->reg_vbus) { 40 if (port > 1) { 41 dev_warn(dev, 42 "Not support multi-port regulator control\n"); 43 return 0; 44 } 45 if (enable) 46 ret = regulator_enable(priv->reg_vbus); 47 else 48 ret = regulator_disable(priv->reg_vbus); 49 if (ret) { 50 dev_err(dev, 51 "Failed to %s vbus regulator, ret=%d\n", 52 enable ? "enable" : "disable", ret); 53 return ret; 54 } 55 } 56 57 if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) { 58 /* 59 * Marvell 28nm HSIC PHY requires forcing the port to HS mode. 60 * As HSIC is always HS, this should be safe for others. 61 */ 62 hw_port_test_set(ci, 5); 63 hw_port_test_set(ci, 0); 64 } 65 return 0; 66 }; 67 68 static int ehci_ci_reset(struct usb_hcd *hcd) 69 { 70 struct device *dev = hcd->self.controller; 71 struct ci_hdrc *ci = dev_get_drvdata(dev); 72 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 73 int ret; 74 75 ret = ehci_setup(hcd); 76 if (ret) 77 return ret; 78 79 ehci->need_io_watchdog = 0; 80 81 if (ci->platdata->notify_event) { 82 ret = ci->platdata->notify_event(ci, 83 CI_HDRC_CONTROLLER_RESET_EVENT); 84 if (ret) 85 return ret; 86 } 87 88 ci_platform_configure(ci); 89 90 return ret; 91 } 92 93 static const struct ehci_driver_overrides ehci_ci_overrides = { 94 .extra_priv_size = sizeof(struct ehci_ci_priv), 95 .port_power = ehci_ci_portpower, 96 .reset = ehci_ci_reset, 97 }; 98 99 static irqreturn_t host_irq(struct ci_hdrc *ci) 100 { 101 return usb_hcd_irq(ci->irq, ci->hcd); 102 } 103 104 static int host_start(struct ci_hdrc *ci) 105 { 106 struct usb_hcd *hcd; 107 struct ehci_hcd *ehci; 108 struct ehci_ci_priv *priv; 109 int ret; 110 111 if (usb_disabled()) 112 return -ENODEV; 113 114 hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent, 115 ci->dev, dev_name(ci->dev), NULL); 116 if (!hcd) 117 return -ENOMEM; 118 119 dev_set_drvdata(ci->dev, ci); 120 hcd->rsrc_start = ci->hw_bank.phys; 121 hcd->rsrc_len = ci->hw_bank.size; 122 hcd->regs = ci->hw_bank.abs; 123 hcd->has_tt = 1; 124 125 hcd->power_budget = ci->platdata->power_budget; 126 hcd->tpl_support = ci->platdata->tpl_support; 127 if (ci->phy || ci->usb_phy) 128 hcd->skip_phy_initialization = 1; 129 130 ehci = hcd_to_ehci(hcd); 131 ehci->caps = ci->hw_bank.cap; 132 ehci->has_hostpc = ci->hw_bank.lpm; 133 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm; 134 ehci->imx28_write_fix = ci->imx28_write_fix; 135 136 priv = (struct ehci_ci_priv *)ehci->priv; 137 priv->reg_vbus = NULL; 138 139 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) { 140 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) { 141 ret = regulator_enable(ci->platdata->reg_vbus); 142 if (ret) { 143 dev_err(ci->dev, 144 "Failed to enable vbus regulator, ret=%d\n", 145 ret); 146 goto put_hcd; 147 } 148 } else { 149 priv->reg_vbus = ci->platdata->reg_vbus; 150 } 151 } 152 153 ret = usb_add_hcd(hcd, 0, 0); 154 if (ret) { 155 goto disable_reg; 156 } else { 157 struct usb_otg *otg = &ci->otg; 158 159 ci->hcd = hcd; 160 161 if (ci_otg_is_fsm_mode(ci)) { 162 otg->host = &hcd->self; 163 hcd->self.otg_port = 1; 164 } 165 } 166 167 return ret; 168 169 disable_reg: 170 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) && 171 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON)) 172 regulator_disable(ci->platdata->reg_vbus); 173 put_hcd: 174 usb_put_hcd(hcd); 175 176 return ret; 177 } 178 179 static void host_stop(struct ci_hdrc *ci) 180 { 181 struct usb_hcd *hcd = ci->hcd; 182 183 if (hcd) { 184 if (ci->platdata->notify_event) 185 ci->platdata->notify_event(ci, 186 CI_HDRC_CONTROLLER_STOPPED_EVENT); 187 usb_remove_hcd(hcd); 188 ci->role = CI_ROLE_END; 189 synchronize_irq(ci->irq); 190 usb_put_hcd(hcd); 191 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) && 192 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON)) 193 regulator_disable(ci->platdata->reg_vbus); 194 } 195 ci->hcd = NULL; 196 ci->otg.host = NULL; 197 } 198 199 200 void ci_hdrc_host_destroy(struct ci_hdrc *ci) 201 { 202 if (ci->role == CI_ROLE_HOST && ci->hcd) 203 host_stop(ci); 204 } 205 206 static int ci_ehci_bus_suspend(struct usb_hcd *hcd) 207 { 208 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 209 int port; 210 u32 tmp; 211 212 int ret = orig_bus_suspend(hcd); 213 214 if (ret) 215 return ret; 216 217 port = HCS_N_PORTS(ehci->hcs_params); 218 while (port--) { 219 u32 __iomem *reg = &ehci->regs->port_status[port]; 220 u32 portsc = ehci_readl(ehci, reg); 221 222 if (portsc & PORT_CONNECT) { 223 /* 224 * For chipidea, the resume signal will be ended 225 * automatically, so for remote wakeup case, the 226 * usbcmd.rs may not be set before the resume has 227 * ended if other resume paths consumes too much 228 * time (~24ms), in that case, the SOF will not 229 * send out within 3ms after resume ends, then the 230 * high speed device will enter full speed mode. 231 */ 232 233 tmp = ehci_readl(ehci, &ehci->regs->command); 234 tmp |= CMD_RUN; 235 ehci_writel(ehci, tmp, &ehci->regs->command); 236 /* 237 * It needs a short delay between set RS bit and PHCD. 238 */ 239 usleep_range(150, 200); 240 break; 241 } 242 } 243 244 return 0; 245 } 246 247 int ci_hdrc_host_init(struct ci_hdrc *ci) 248 { 249 struct ci_role_driver *rdrv; 250 251 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC)) 252 return -ENXIO; 253 254 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL); 255 if (!rdrv) 256 return -ENOMEM; 257 258 rdrv->start = host_start; 259 rdrv->stop = host_stop; 260 rdrv->irq = host_irq; 261 rdrv->name = "host"; 262 ci->roles[CI_ROLE_HOST] = rdrv; 263 264 return 0; 265 } 266 267 void ci_hdrc_host_driver_init(void) 268 { 269 ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides); 270 orig_bus_suspend = ci_ehci_hc_driver.bus_suspend; 271 ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend; 272 } 273