blob: d63b5ba0d80af0b841f287399c688e1db9cc9b32 [file] [log] [blame]
/* ehci-msm.c - HSUSB Host Controller Driver Implementation
*
* Copyright (c) 2008-2013, The Linux Foundation. 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/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/dma-mapping.h>
#include <linux/usb/otg.h>
#include <linux/usb/msm_hsusb.h>
#include <linux/usb/msm_hsusb_hw.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "ehci.h"
#define MSM_USB_BASE (hcd->regs)
#define DRIVER_DESC "Qualcomm On-Chip EHCI Host Controller"
static const char hcd_name[] = "ehci-msm";
static struct hc_driver __read_mostly ehci_msm_hc_driver;
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_relaxed(0, USB_AHBBURST);
/* Use the AHB transactor */
writel_relaxed(0x08, USB_AHBMODE);
/* Disable streaming mode and select host mode */
writel_relaxed(0x13, USB_USBMODE);
if (hcd->phy->flags & ENABLE_SECONDARY_PHY) {
ehci_dbg(ehci, "using secondary hsphy\n");
writel_relaxed(readl_relaxed(USB_PHY_CTRL2) | (1<<16),
USB_PHY_CTRL2);
}
/* Disable ULPI_TX_PKT_EN_CLR_FIX which is valid only for HSIC */
writel_relaxed(readl_relaxed(USB_GENCONFIG2) & ~(1<<19),
USB_GENCONFIG2);
return 0;
}
static const struct ehci_driver_overrides ehci_msm_overrides __initdata = {
.reset = ehci_msm_reset,
};
static u64 msm_ehci_dma_mask = DMA_BIT_MASK(64);
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");
if (!pdev->dev.dma_mask)
pdev->dev.dma_mask = &msm_ehci_dma_mask;
if (!pdev->dev.coherent_dma_mask)
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(64);
hcd = usb_create_hcd(&ehci_msm_hc_driver, &pdev->dev,
dev_name(&pdev->dev));
if (!hcd) {
dev_err(&pdev->dev, "Unable to create HCD\n");
return -ENOMEM;
}
hcd_to_bus(hcd)->skip_resume = true;
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 = devm_ioremap(&pdev->dev, 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 = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
if (IS_ERR_OR_NULL(phy)) {
dev_err(&pdev->dev, "unable to find transceiver\n");
ret = -ENODEV;
goto put_hcd;
}
ret = otg_set_host(phy->otg, &hcd->self);
if (ret < 0) {
dev_err(&pdev->dev, "unable to register with transceiver\n");
goto put_hcd;
}
hcd->phy = phy;
device_init_wakeup(&pdev->dev, 1);
pm_runtime_enable(&pdev->dev);
msm_bam_set_usb_host_dev(&pdev->dev);
return 0;
put_hcd:
usb_put_hcd(hcd);
return ret;
}
static int 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);
hcd->phy = NULL;
otg_set_host(phy->otg, NULL);
/* FIXME: need to call usb_remove_hcd() here? */
usb_put_hcd(hcd);
return 0;
}
#ifdef CONFIG_PM_RUNTIME
static int ehci_msm_runtime_idle(struct device *dev)
{
dev_dbg(dev, "ehci runtime idle\n");
return 0;
}
static int ehci_msm_runtime_suspend(struct device *dev)
{
dev_dbg(dev, "ehci runtime suspend\n");
/*
* Notify OTG about suspend. It takes care of
* putting the hardware in LPM.
*/
return usb_phy_set_suspend(phy, 1);
}
static int ehci_msm_runtime_resume(struct device *dev)
{
dev_dbg(dev, "ehci runtime resume\n");
return usb_phy_set_suspend(phy, 0);
}
#endif
#ifdef CONFIG_PM_SLEEP
static int ehci_msm_pm_suspend(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
bool do_wakeup = device_may_wakeup(dev);
int ret;
dev_dbg(dev, "ehci-msm PM suspend\n");
if (!hcd->rh_registered)
return 0;
ret = ehci_suspend(hcd, do_wakeup);
if (ret)
return ret;
return usb_phy_set_suspend(phy, 1);
}
static int ehci_msm_pm_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
int ret;
dev_dbg(dev, "ehci-msm PM resume\n");
if (!hcd->rh_registered)
return 0;
/* Notify OTG to bring hw out of LPM before restoring wakeup flags */
ret = usb_phy_set_suspend(phy, 0);
if (ret)
return ret;
ehci_resume(hcd, false);
/* Resume root-hub to handle USB event if any else initiate LPM again */
usb_hcd_resume_root_hub(hcd);
return ret;
}
#endif
static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(ehci_msm_pm_suspend, ehci_msm_pm_resume)
SET_RUNTIME_PM_OPS(ehci_msm_runtime_suspend, ehci_msm_runtime_resume,
ehci_msm_runtime_idle)
};
static struct platform_driver ehci_msm_driver = {
.probe = ehci_msm_probe,
.remove = ehci_msm_remove,
.driver = {
.name = "msm_hsusb_host",
.pm = &ehci_msm_dev_pm_ops,
},
};
static int __init ehci_msm_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
ehci_init_driver(&ehci_msm_hc_driver, &ehci_msm_overrides);
return platform_driver_register(&ehci_msm_driver);
}
module_init(ehci_msm_init);
static void __exit ehci_msm_cleanup(void)
{
platform_driver_unregister(&ehci_msm_driver);
}
module_exit(ehci_msm_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:msm-ehci");
MODULE_LICENSE("GPL");