drivers/usb/host/ehci-msm.c

   1 /* ehci-msm.c - HSUSB Host Controller Driver Implementation
   2  *
   3  * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved.
   4  *
   5  * Partly derived from ehci-fsl.c and ehci-hcd.c
   6  * Copyright (c) 2000-2004 by David Brownell
   7  * Copyright (c) 2005 MontaVista Software
   8  *
   9  * All source code in this file is licensed under the following license except
  10  * where indicated.
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License version 2 as published
  14  * by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  19  *
  20  * See the GNU General Public License for more details.
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, you can find it at http://www.fsf.org
  23  */
  24
  25 #include <linux/clk.h>
  26 #include <linux/err.h>
  27 #include <linux/io.h>
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/pm_runtime.h>
  32 #include <linux/usb/otg.h>
  33 #include <linux/usb/msm_hsusb_hw.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/hcd.h>
  36 #include <linux/acpi.h>
  37
  38 #include "ehci.h"
  39
  40 #define MSM_USB_BASE (hcd->regs)
  41
  42 #define DRIVER_DESC "Qualcomm On-Chip EHCI Host Controller"
  43
  44 static const char hcd_name[] = "ehci-msm";
  45 static struct hc_driver __read_mostly msm_hc_driver;
  46
  47 static int ehci_msm_reset(struct usb_hcd *hcd)
  48 {
  49         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  50         int retval;
  51
  52         ehci->caps = USB_CAPLENGTH;
  53         hcd->has_tt = 1;
  54
  55         retval = ehci_setup(hcd);
  56         if (retval)
  57                 return retval;
  58
  59         /* select ULPI phy and clear other status/control bits in PORTSC */
  60         writel(PORTSC_PTS_ULPI, USB_PORTSC);
  61         /* bursts of unspecified length. */
  62         writel(0, USB_AHBBURST);
  63         /* Use the AHB transactor, allow posted data writes */
  64         writel(0x8, USB_AHBMODE);
  65         /* Disable streaming mode and select host mode */
  66         writel(0x13, USB_USBMODE);
  67         /* Disable ULPI_TX_PKT_EN_CLR_FIX which is valid only for HSIC */
  68         writel(readl(USB_GENCONFIG_2) & ~ULPI_TX_PKT_EN_CLR_FIX, USB_GENCONFIG_2);
  69
  70         return 0;
  71 }
  72
  73 static int ehci_msm_probe(struct platform_device *pdev)
  74 {
  75         struct usb_hcd *hcd;
  76         struct resource *res;
  77         struct usb_phy *phy;
  78         int ret;
  79
  80         dev_dbg(&pdev->dev, "ehci_msm proble\n");
  81
  82         hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
  83         if (!hcd) {
  84                 dev_err(&pdev->dev, "Unable to create HCD\n");
  85                 return  -ENOMEM;
  86         }
  87
  88         ret = platform_get_irq(pdev, 0);
  89         if (ret < 0) {
  90                 dev_err(&pdev->dev, "Unable to get IRQ resource\n");
  91                 goto put_hcd;
  92         }
  93         hcd->irq = ret;
  94
  95         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  96         if (!res) {
  97                 dev_err(&pdev->dev, "Unable to get memory resource\n");
  98                 ret = -ENODEV;
  99                 goto put_hcd;
 100         }
 101
 102         hcd->rsrc_start = res->start;
 103         hcd->rsrc_len = resource_size(res);
 104         hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
 105         if (!hcd->regs) {
 106                 dev_err(&pdev->dev, "ioremap failed\n");
 107                 ret = -ENOMEM;
 108                 goto put_hcd;
 109         }
 110
 111         /*
 112          * If there is an OTG driver, let it take care of PHY initialization,
 113          * clock management, powering up VBUS, mapping of registers address
 114          * space and power management.
 115          */
 116         if (pdev->dev.of_node)
 117                 phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
 118         else
 119                 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 120
 121         if (IS_ERR(phy)) {
 122                 if (PTR_ERR(phy) == -EPROBE_DEFER) {
 123                         dev_err(&pdev->dev, "unable to find transceiver\n");
 124                         ret = -EPROBE_DEFER;
 125                         goto put_hcd;
 126                 }
 127                 phy = NULL;
 128         }
 129
 130         hcd->usb_phy = phy;
 131         device_init_wakeup(&pdev->dev, 1);
 132
 133         if (phy && phy->otg) {
 134                 /*
 135                  * MSM OTG driver takes care of adding the HCD and
 136                  * placing hardware into low power mode via runtime PM.
 137                  */
 138                 ret = otg_set_host(phy->otg, &hcd->self);
 139                 if (ret < 0) {
 140                         dev_err(&pdev->dev, "unable to register with transceiver\n");
 141                         goto put_hcd;
 142                 }
 143
 144                 pm_runtime_no_callbacks(&pdev->dev);
 145                 pm_runtime_enable(&pdev->dev);
 146         } else {
 147                 ret = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
 148                 if (ret)
 149                         goto put_hcd;
 150         }
 151
 152         return 0;
 153
 154 put_hcd:
 155         usb_put_hcd(hcd);
 156
 157         return ret;
 158 }
 159
 160 static int ehci_msm_remove(struct platform_device *pdev)
 161 {
 162         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 163
 164         device_init_wakeup(&pdev->dev, 0);
 165         pm_runtime_disable(&pdev->dev);
 166         pm_runtime_set_suspended(&pdev->dev);
 167
 168         if (hcd->usb_phy && hcd->usb_phy->otg)
 169                 otg_set_host(hcd->usb_phy->otg, NULL);
 170         else
 171                 usb_remove_hcd(hcd);
 172
 173         usb_put_hcd(hcd);
 174
 175         return 0;
 176 }
 177
 178 #ifdef CONFIG_PM
 179 static int ehci_msm_pm_suspend(struct device *dev)
 180 {
 181         struct usb_hcd *hcd = dev_get_drvdata(dev);
 182         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 183         bool do_wakeup = device_may_wakeup(dev);
 184
 185         dev_dbg(dev, "ehci-msm PM suspend\n");
 186
 187         /* Only call ehci_suspend if ehci_setup has been done */
 188         if (ehci->sbrn)
 189                 return ehci_suspend(hcd, do_wakeup);
 190
 191         return 0;
 192 }
 193
 194 static int ehci_msm_pm_resume(struct device *dev)
 195 {
 196         struct usb_hcd *hcd = dev_get_drvdata(dev);
 197         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 198
 199         dev_dbg(dev, "ehci-msm PM resume\n");
 200
 201         /* Only call ehci_resume if ehci_setup has been done */
 202         if (ehci->sbrn)
 203                 ehci_resume(hcd, false);
 204
 205         return 0;
 206 }
 207
 208 #else
 209 #define ehci_msm_pm_suspend     NULL
 210 #define ehci_msm_pm_resume      NULL
 211 #endif
 212
 213 static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
 214         .suspend         = ehci_msm_pm_suspend,
 215         .resume          = ehci_msm_pm_resume,
 216 };
 217
 218 static const struct acpi_device_id msm_ehci_acpi_ids[] = {
 219         { "QCOM8040", 0 },
 220         { }
 221 };
 222 MODULE_DEVICE_TABLE(acpi, msm_ehci_acpi_ids);
 223
 224 static const struct of_device_id msm_ehci_dt_match[] = {
 225         { .compatible = "qcom,ehci-host", },
 226         {}
 227 };
 228 MODULE_DEVICE_TABLE(of, msm_ehci_dt_match);
 229
 230 static struct platform_driver ehci_msm_driver = {
 231         .probe  = ehci_msm_probe,
 232         .remove = ehci_msm_remove,
 233         .shutdown = usb_hcd_platform_shutdown,
 234         .driver = {
 235                    .name = "msm_hsusb_host",
 236                    .pm = &ehci_msm_dev_pm_ops,
 237                    .of_match_table = msm_ehci_dt_match,
 238                    .acpi_match_table = ACPI_PTR(msm_ehci_acpi_ids),
 239         },
 240 };
 241
 242 static const struct ehci_driver_overrides msm_overrides __initconst = {
 243         .reset = ehci_msm_reset,
 244 };
 245
 246 static int __init ehci_msm_init(void)
 247 {
 248         if (usb_disabled())
 249                 return -ENODEV;
 250
 251         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 252         ehci_init_driver(&msm_hc_driver, &msm_overrides);
 253         return platform_driver_register(&ehci_msm_driver);
 254 }
 255 module_init(ehci_msm_init);
 256
 257 static void __exit ehci_msm_cleanup(void)
 258 {
 259         platform_driver_unregister(&ehci_msm_driver);
 260 }
 261 module_exit(ehci_msm_cleanup);
 262
 263 MODULE_DESCRIPTION(DRIVER_DESC);
 264 MODULE_ALIAS("platform:msm-ehci");
 265 MODULE_LICENSE("GPL");