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