diff options
Diffstat (limited to 'drivers/usb/host/ehci-msm.c')
| -rw-r--r-- | drivers/usb/host/ehci-msm.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c new file mode 100644 index 00000000..9803a55f --- /dev/null +++ b/drivers/usb/host/ehci-msm.c @@ -0,0 +1,247 @@ +/* ehci-msm.c - HSUSB Host Controller Driver Implementation + * + * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved. + * + * Partly derived from ehci-fsl.c and ehci-hcd.c + * Copyright (c) 2000-2004 by David Brownell + * Copyright (c) 2005 MontaVista Software + * + * All source code in this file is licensed under the following license except + * where indicated. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * See the GNU General Public License for more details. + * You should have received a copy of the GNU General Public License + * along with this program; if not, you can find it at http://www.fsf.org + */ + +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/pm_runtime.h> + +#include <linux/usb/otg.h> +#include <linux/usb/msm_hsusb_hw.h> + +#define MSM_USB_BASE (hcd->regs) + +static struct usb_phy *phy; + +static int ehci_msm_reset(struct usb_hcd *hcd) +{ + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + int retval; + + ehci->caps = USB_CAPLENGTH; + hcd->has_tt = 1; + + retval = ehci_setup(hcd); + if (retval) + return retval; + + /* bursts of unspecified length. */ + writel(0, USB_AHBBURST); + /* Use the AHB transactor */ + writel(0, USB_AHBMODE); + /* Disable streaming mode and select host mode */ + writel(0x13, USB_USBMODE); + + ehci_port_power(ehci, 1); + return 0; +} + +static struct hc_driver msm_hc_driver = { + .description = hcd_name, + .product_desc = "Qualcomm On-Chip EHCI Host Controller", + .hcd_priv_size = sizeof(struct ehci_hcd), + + /* + * generic hardware linkage + */ + .irq = ehci_irq, + .flags = HCD_USB2 | HCD_MEMORY, + + .reset = ehci_msm_reset, + .start = ehci_run, + + .stop = ehci_stop, + .shutdown = ehci_shutdown, + + /* + * managing i/o requests and associated device resources + */ + .urb_enqueue = ehci_urb_enqueue, + .urb_dequeue = ehci_urb_dequeue, + .endpoint_disable = ehci_endpoint_disable, + .endpoint_reset = ehci_endpoint_reset, + .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, + + /* + * scheduling support + */ + .get_frame_number = ehci_get_frame, + + /* + * root hub support + */ + .hub_status_data = ehci_hub_status_data, + .hub_control = ehci_hub_control, + .relinquish_port = ehci_relinquish_port, + .port_handed_over = ehci_port_handed_over, + + /* + * PM support + */ + .bus_suspend = ehci_bus_suspend, + .bus_resume = ehci_bus_resume, +}; + +static int ehci_msm_probe(struct platform_device *pdev) +{ + struct usb_hcd *hcd; + struct resource *res; + int ret; + + dev_dbg(&pdev->dev, "ehci_msm proble\n"); + + hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev)); + if (!hcd) { + dev_err(&pdev->dev, "Unable to create HCD\n"); + return -ENOMEM; + } + + hcd->irq = platform_get_irq(pdev, 0); + if (hcd->irq < 0) { + dev_err(&pdev->dev, "Unable to get IRQ resource\n"); + ret = hcd->irq; + goto put_hcd; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "Unable to get memory resource\n"); + ret = -ENODEV; + goto put_hcd; + } + + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); + if (!hcd->regs) { + dev_err(&pdev->dev, "ioremap failed\n"); + ret = -ENOMEM; + goto put_hcd; + } + + /* + * OTG driver takes care of PHY initialization, clock management, + * powering up VBUS, mapping of registers address space and power + * management. + */ + phy = usb_get_transceiver(); + if (!phy) { + dev_err(&pdev->dev, "unable to find transceiver\n"); + ret = -ENODEV; + goto unmap; + } + + ret = otg_set_host(phy->otg, &hcd->self); + if (ret < 0) { + dev_err(&pdev->dev, "unable to register with transceiver\n"); + goto put_transceiver; + } + + device_init_wakeup(&pdev->dev, 1); + /* + * OTG device parent of HCD takes care of putting + * hardware into low power mode. + */ + pm_runtime_no_callbacks(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + return 0; + +put_transceiver: + usb_put_transceiver(phy); +unmap: + iounmap(hcd->regs); +put_hcd: + usb_put_hcd(hcd); + + return ret; +} + +static int __devexit ehci_msm_remove(struct platform_device *pdev) +{ + struct usb_hcd *hcd = platform_get_drvdata(pdev); + + device_init_wakeup(&pdev->dev, 0); + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + + otg_set_host(phy->otg, NULL); + usb_put_transceiver(phy); + + usb_put_hcd(hcd); + + return 0; +} + +#ifdef CONFIG_PM +static int ehci_msm_pm_suspend(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + bool wakeup = device_may_wakeup(dev); + + dev_dbg(dev, "ehci-msm PM suspend\n"); + + /* + * EHCI helper function has also the same check before manipulating + * port wakeup flags. We do check here the same condition before + * calling the same helper function to avoid bringing hardware + * from Low power mode when there is no need for adjusting port + * wakeup flags. + */ + if (hcd->self.root_hub->do_remote_wakeup && !wakeup) { + pm_runtime_resume(dev); + ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd), + wakeup); + } + + return 0; +} + +static int ehci_msm_pm_resume(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + + dev_dbg(dev, "ehci-msm PM resume\n"); + ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd)); + + return 0; +} +#else +#define ehci_msm_pm_suspend NULL +#define ehci_msm_pm_resume NULL +#endif + +static const struct dev_pm_ops ehci_msm_dev_pm_ops = { + .suspend = ehci_msm_pm_suspend, + .resume = ehci_msm_pm_resume, +}; + +static struct platform_driver ehci_msm_driver = { + .probe = ehci_msm_probe, + .remove = __devexit_p(ehci_msm_remove), + .driver = { + .name = "msm_hsusb_host", + .pm = &ehci_msm_dev_pm_ops, + }, +}; |