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 struct ci_hdrc *ci; 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 ci_hdrc *ci = priv->ci; 48 struct device *dev = hcd->self.controller; 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 const struct ehci_driver_overrides ehci_ci_overrides = { 82 .extra_priv_size = sizeof(struct ehci_ci_priv), 83 .port_power = ehci_ci_portpower, 84 }; 85 86 static irqreturn_t host_irq(struct ci_hdrc *ci) 87 { 88 return usb_hcd_irq(ci->irq, ci->hcd); 89 } 90 91 static int host_start(struct ci_hdrc *ci) 92 { 93 struct usb_hcd *hcd; 94 struct ehci_hcd *ehci; 95 struct ehci_ci_priv *priv; 96 int ret; 97 98 if (usb_disabled()) 99 return -ENODEV; 100 101 hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev)); 102 if (!hcd) 103 return -ENOMEM; 104 105 dev_set_drvdata(ci->dev, ci); 106 hcd->rsrc_start = ci->hw_bank.phys; 107 hcd->rsrc_len = ci->hw_bank.size; 108 hcd->regs = ci->hw_bank.abs; 109 hcd->has_tt = 1; 110 111 hcd->power_budget = ci->platdata->power_budget; 112 hcd->tpl_support = ci->platdata->tpl_support; 113 if (ci->phy) 114 hcd->phy = ci->phy; 115 else 116 hcd->usb_phy = ci->usb_phy; 117 118 ehci = hcd_to_ehci(hcd); 119 ehci->caps = ci->hw_bank.cap; 120 ehci->has_hostpc = ci->hw_bank.lpm; 121 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm; 122 ehci->imx28_write_fix = ci->imx28_write_fix; 123 124 priv = (struct ehci_ci_priv *)ehci->priv; 125 priv->reg_vbus = NULL; 126 priv->ci = ci; 127 128 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) { 129 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) { 130 ret = regulator_enable(ci->platdata->reg_vbus); 131 if (ret) { 132 dev_err(ci->dev, 133 "Failed to enable vbus regulator, ret=%d\n", 134 ret); 135 goto put_hcd; 136 } 137 } else { 138 priv->reg_vbus = ci->platdata->reg_vbus; 139 } 140 } 141 142 ret = usb_add_hcd(hcd, 0, 0); 143 if (ret) { 144 goto disable_reg; 145 } else { 146 struct usb_otg *otg = &ci->otg; 147 148 ci->hcd = hcd; 149 150 if (ci_otg_is_fsm_mode(ci)) { 151 otg->host = &hcd->self; 152 hcd->self.otg_port = 1; 153 } 154 } 155 156 if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING) 157 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS); 158 159 if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) 160 hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC); 161 162 return ret; 163 164 disable_reg: 165 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) && 166 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON)) 167 regulator_disable(ci->platdata->reg_vbus); 168 put_hcd: 169 usb_put_hcd(hcd); 170 171 return ret; 172 } 173 174 static void host_stop(struct ci_hdrc *ci) 175 { 176 struct usb_hcd *hcd = ci->hcd; 177 178 if (hcd) { 179 usb_remove_hcd(hcd); 180 usb_put_hcd(hcd); 181 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) && 182 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON)) 183 regulator_disable(ci->platdata->reg_vbus); 184 } 185 } 186 187 188 void ci_hdrc_host_destroy(struct ci_hdrc *ci) 189 { 190 if (ci->role == CI_ROLE_HOST && ci->hcd) 191 host_stop(ci); 192 } 193 194 static int ci_ehci_bus_suspend(struct usb_hcd *hcd) 195 { 196 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 197 int port; 198 u32 tmp; 199 200 int ret = orig_bus_suspend(hcd); 201 202 if (ret) 203 return ret; 204 205 port = HCS_N_PORTS(ehci->hcs_params); 206 while (port--) { 207 u32 __iomem *reg = &ehci->regs->port_status[port]; 208 u32 portsc = ehci_readl(ehci, reg); 209 210 if (portsc & PORT_CONNECT) { 211 /* 212 * For chipidea, the resume signal will be ended 213 * automatically, so for remote wakeup case, the 214 * usbcmd.rs may not be set before the resume has 215 * ended if other resume paths consumes too much 216 * time (~24ms), in that case, the SOF will not 217 * send out within 3ms after resume ends, then the 218 * high speed device will enter full speed mode. 219 */ 220 221 tmp = ehci_readl(ehci, &ehci->regs->command); 222 tmp |= CMD_RUN; 223 ehci_writel(ehci, tmp, &ehci->regs->command); 224 /* 225 * It needs a short delay between set RS bit and PHCD. 226 */ 227 usleep_range(150, 200); 228 break; 229 } 230 } 231 232 return 0; 233 } 234 235 int ci_hdrc_host_init(struct ci_hdrc *ci) 236 { 237 struct ci_role_driver *rdrv; 238 239 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC)) 240 return -ENXIO; 241 242 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL); 243 if (!rdrv) 244 return -ENOMEM; 245 246 rdrv->start = host_start; 247 rdrv->stop = host_stop; 248 rdrv->irq = host_irq; 249 rdrv->name = "host"; 250 ci->roles[CI_ROLE_HOST] = rdrv; 251 252 return 0; 253 } 254 255 void ci_hdrc_host_driver_init(void) 256 { 257 ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides); 258 orig_bus_suspend = ci_ehci_hc_driver.bus_suspend; 259 ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend; 260 } 261