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 37 static irqreturn_t host_irq(struct ci_hdrc *ci) 38 { 39 return usb_hcd_irq(ci->irq, ci->hcd); 40 } 41 42 static int host_start(struct ci_hdrc *ci) 43 { 44 struct usb_hcd *hcd; 45 struct ehci_hcd *ehci; 46 int ret; 47 48 if (usb_disabled()) 49 return -ENODEV; 50 51 hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev)); 52 if (!hcd) 53 return -ENOMEM; 54 55 dev_set_drvdata(ci->dev, ci); 56 hcd->rsrc_start = ci->hw_bank.phys; 57 hcd->rsrc_len = ci->hw_bank.size; 58 hcd->regs = ci->hw_bank.abs; 59 hcd->has_tt = 1; 60 61 hcd->power_budget = ci->platdata->power_budget; 62 hcd->phy = ci->transceiver; 63 64 ehci = hcd_to_ehci(hcd); 65 ehci->caps = ci->hw_bank.cap; 66 ehci->has_hostpc = ci->hw_bank.lpm; 67 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm; 68 ehci->imx28_write_fix = ci->imx28_write_fix; 69 70 if (ci->platdata->reg_vbus) { 71 ret = regulator_enable(ci->platdata->reg_vbus); 72 if (ret) { 73 dev_err(ci->dev, 74 "Failed to enable vbus regulator, ret=%d\n", 75 ret); 76 goto put_hcd; 77 } 78 } 79 80 ret = usb_add_hcd(hcd, 0, 0); 81 if (ret) 82 goto disable_reg; 83 else 84 ci->hcd = hcd; 85 86 if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING) 87 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS); 88 89 return ret; 90 91 disable_reg: 92 if (ci->platdata->reg_vbus) 93 regulator_disable(ci->platdata->reg_vbus); 94 95 put_hcd: 96 usb_put_hcd(hcd); 97 98 return ret; 99 } 100 101 static void host_stop(struct ci_hdrc *ci) 102 { 103 struct usb_hcd *hcd = ci->hcd; 104 105 if (hcd) { 106 usb_remove_hcd(hcd); 107 usb_put_hcd(hcd); 108 if (ci->platdata->reg_vbus) 109 regulator_disable(ci->platdata->reg_vbus); 110 } 111 } 112 113 114 void ci_hdrc_host_destroy(struct ci_hdrc *ci) 115 { 116 if (ci->role == CI_ROLE_HOST && ci->hcd) 117 host_stop(ci); 118 } 119 120 int ci_hdrc_host_init(struct ci_hdrc *ci) 121 { 122 struct ci_role_driver *rdrv; 123 124 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC)) 125 return -ENXIO; 126 127 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL); 128 if (!rdrv) 129 return -ENOMEM; 130 131 rdrv->start = host_start; 132 rdrv->stop = host_stop; 133 rdrv->irq = host_irq; 134 rdrv->name = "host"; 135 ci->roles[CI_ROLE_HOST] = rdrv; 136 137 ehci_init_driver(&ci_ehci_hc_driver, NULL); 138 139 return 0; 140 } 141