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/platform_device.h>
  26 #include <linux/clk.h>
  27 #include <linux/err.h>
  28 #include <linux/pm_runtime.h>
  29
  30 #include <linux/usb/otg.h>
  31 #include <linux/usb/msm_hsusb_hw.h>
  32
  33 #define MSM_USB_BASE (hcd->regs)
  34
  35 static struct otg_transceiver *otg;
  36
  37 static int ehci_msm_reset(struct usb_hcd *hcd)
  38 {
  39         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  40         int retval;
  41
  42         ehci->caps = USB_CAPLENGTH;
  43         hcd->has_tt = 1;
  44
  45         retval = ehci_setup(hcd);
  46         if (retval)
  47                 return retval;
  48
  49         /* bursts of unspecified length. */
  50         writel(0, USB_AHBBURST);
  51         /* Use the AHB transactor */
  52         writel(0, USB_AHBMODE);
  53         /* Disable streaming mode and select host mode */
  54         writel(0x13, USB_USBMODE);
  55
  56         ehci_port_power(ehci, 1);
  57         return 0;
  58 }
  59
  60 static struct hc_driver msm_hc_driver = {
  61         .description            = hcd_name,
  62         .product_desc           = "Qualcomm On-Chip EHCI Host Controller",
  63         .hcd_priv_size          = sizeof(struct ehci_hcd),
  64
  65         /*
  66          * generic hardware linkage
  67          */
  68         .irq                    = ehci_irq,
  69         .flags                  = HCD_USB2 | HCD_MEMORY,
  70
  71         .reset                  = ehci_msm_reset,
  72         .start                  = ehci_run,
  73
  74         .stop                   = ehci_stop,
  75         .shutdown               = ehci_shutdown,
  76
  77         /*
  78          * managing i/o requests and associated device resources
  79          */
  80         .urb_enqueue            = ehci_urb_enqueue,
  81         .urb_dequeue            = ehci_urb_dequeue,
  82         .endpoint_disable       = ehci_endpoint_disable,
  83         .endpoint_reset         = ehci_endpoint_reset,
  84         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
  85
  86         /*
  87          * scheduling support
  88          */
  89         .get_frame_number       = ehci_get_frame,
  90
  91         /*
  92          * root hub support
  93          */
  94         .hub_status_data        = ehci_hub_status_data,
  95         .hub_control            = ehci_hub_control,
  96         .relinquish_port        = ehci_relinquish_port,
  97         .port_handed_over       = ehci_port_handed_over,
  98
  99         /*
 100          * PM support
 101          */
 102         .bus_suspend            = ehci_bus_suspend,
 103         .bus_resume             = ehci_bus_resume,
 104 };
 105
 106 static int ehci_msm_probe(struct platform_device *pdev)
 107 {
 108         struct usb_hcd *hcd;
 109         struct resource *res;
 110         int ret;
 111
 112         dev_dbg(&pdev->dev, "ehci_msm proble\n");
 113
 114         hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
 115         if (!hcd) {
 116                 dev_err(&pdev->dev, "Unable to create HCD\n");
 117                 return  -ENOMEM;
 118         }
 119
 120         hcd->irq = platform_get_irq(pdev, 0);
 121         if (hcd->irq < 0) {
 122                 dev_err(&pdev->dev, "Unable to get IRQ resource\n");
 123                 ret = hcd->irq;
 124                 goto put_hcd;
 125         }
 126
 127         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 128         if (!res) {
 129                 dev_err(&pdev->dev, "Unable to get memory resource\n");
 130                 ret = -ENODEV;
 131                 goto put_hcd;
 132         }
 133
 134         hcd->rsrc_start = res->start;
 135         hcd->rsrc_len = resource_size(res);
 136         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 137         if (!hcd->regs) {
 138                 dev_err(&pdev->dev, "ioremap failed\n");
 139                 ret = -ENOMEM;
 140                 goto put_hcd;
 141         }
 142
 143         /*
 144          * OTG driver takes care of PHY initialization, clock management,
 145          * powering up VBUS, mapping of registers address space and power
 146          * management.
 147          */
 148         otg = otg_get_transceiver();
 149         if (!otg) {
 150                 dev_err(&pdev->dev, "unable to find transceiver\n");
 151                 ret = -ENODEV;
 152                 goto unmap;
 153         }
 154
 155         ret = otg_set_host(otg, &hcd->self);
 156         if (ret < 0) {
 157                 dev_err(&pdev->dev, "unable to register with transceiver\n");
 158                 goto put_transceiver;
 159         }
 160
 161         device_init_wakeup(&pdev->dev, 1);
 162         /*
 163          * OTG device parent of HCD takes care of putting
 164          * hardware into low power mode.
 165          */
 166         pm_runtime_no_callbacks(&pdev->dev);
 167         pm_runtime_enable(&pdev->dev);
 168
 169         return 0;
 170
 171 put_transceiver:
 172         otg_put_transceiver(otg);
 173 unmap:
 174         iounmap(hcd->regs);
 175 put_hcd:
 176         usb_put_hcd(hcd);
 177
 178         return ret;
 179 }
 180
 181 static int __devexit ehci_msm_remove(struct platform_device *pdev)
 182 {
 183         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 184
 185         device_init_wakeup(&pdev->dev, 0);
 186         pm_runtime_disable(&pdev->dev);
 187         pm_runtime_set_suspended(&pdev->dev);
 188
 189         otg_set_host(otg, NULL);
 190         otg_put_transceiver(otg);
 191
 192         usb_put_hcd(hcd);
 193
 194         return 0;
 195 }
 196
 197 #ifdef CONFIG_PM
 198 static int ehci_msm_pm_suspend(struct device *dev)
 199 {
 200         struct usb_hcd *hcd = dev_get_drvdata(dev);
 201         bool wakeup = device_may_wakeup(dev);
 202
 203         dev_dbg(dev, "ehci-msm PM suspend\n");
 204
 205         /*
 206          * EHCI helper function has also the same check before manipulating
 207          * port wakeup flags.  We do check here the same condition before
 208          * calling the same helper function to avoid bringing hardware
 209          * from Low power mode when there is no need for adjusting port
 210          * wakeup flags.
 211          */
 212         if (hcd->self.root_hub->do_remote_wakeup && !wakeup) {
 213                 pm_runtime_resume(dev);
 214                 ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
 215                                 wakeup);
 216         }
 217
 218         return 0;
 219 }
 220
 221 static int ehci_msm_pm_resume(struct device *dev)
 222 {
 223         struct usb_hcd *hcd = dev_get_drvdata(dev);
 224
 225         dev_dbg(dev, "ehci-msm PM resume\n");
 226         ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd));
 227
 228         return 0;
 229 }
 230 #else
 231 #define ehci_msm_pm_suspend     NULL
 232 #define ehci_msm_pm_resume      NULL
 233 #endif
 234
 235 static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
 236         .suspend         = ehci_msm_pm_suspend,
 237         .resume          = ehci_msm_pm_resume,
 238 };
 239
 240 static struct platform_driver ehci_msm_driver = {
 241         .probe  = ehci_msm_probe,
 242         .remove = __devexit_p(ehci_msm_remove),
 243         .driver = {
 244                    .name = "msm_hsusb_host",
 245                    .pm = &ehci_msm_dev_pm_ops,
 246         },
 247 };