327 lines
8.5 KiB
C
327 lines
8.5 KiB
C
/*
|
|
* ehci-omap.c - driver for USBHOST on OMAP3/4 processors
|
|
*
|
|
* Bus Glue for the EHCI controllers in OMAP3/4
|
|
* Tested on several OMAP3 boards, and OMAP4 Pandaboard
|
|
*
|
|
* Copyright (C) 2007-2013 Texas Instruments, Inc.
|
|
* Author: Vikram Pandita <vikram.pandita@ti.com>
|
|
* Author: Anand Gadiyar <gadiyar@ti.com>
|
|
* Author: Keshava Munegowda <keshava_mgowda@ti.com>
|
|
* Author: Roger Quadros <rogerq@ti.com>
|
|
*
|
|
* Copyright (C) 2009 Nokia Corporation
|
|
* Contact: Felipe Balbi <felipe.balbi@nokia.com>
|
|
*
|
|
* Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 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, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/io.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/usb/ulpi.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/hcd.h>
|
|
#include <linux/of.h>
|
|
#include <linux/dma-mapping.h>
|
|
|
|
#include "ehci.h"
|
|
|
|
#include <linux/platform_data/usb-omap.h>
|
|
|
|
/* EHCI Register Set */
|
|
#define EHCI_INSNREG04 (0xA0)
|
|
#define EHCI_INSNREG04_DISABLE_UNSUSPEND (1 << 5)
|
|
#define EHCI_INSNREG05_ULPI (0xA4)
|
|
#define EHCI_INSNREG05_ULPI_CONTROL_SHIFT 31
|
|
#define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT 24
|
|
#define EHCI_INSNREG05_ULPI_OPSEL_SHIFT 22
|
|
#define EHCI_INSNREG05_ULPI_REGADD_SHIFT 16
|
|
#define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT 8
|
|
#define EHCI_INSNREG05_ULPI_WRDATA_SHIFT 0
|
|
|
|
#define DRIVER_DESC "OMAP-EHCI Host Controller driver"
|
|
|
|
static const char hcd_name[] = "ehci-omap";
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
struct omap_hcd {
|
|
struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */
|
|
int nports;
|
|
};
|
|
|
|
static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
|
|
{
|
|
__raw_writel(val, base + reg);
|
|
}
|
|
|
|
static inline u32 ehci_read(void __iomem *base, u32 reg)
|
|
{
|
|
return __raw_readl(base + reg);
|
|
}
|
|
|
|
/* configure so an HC device and id are always provided */
|
|
/* always called with process context; sleeping is OK */
|
|
|
|
static struct hc_driver __read_mostly ehci_omap_hc_driver;
|
|
|
|
static const struct ehci_driver_overrides ehci_omap_overrides __initdata = {
|
|
.extra_priv_size = sizeof(struct omap_hcd),
|
|
};
|
|
|
|
/**
|
|
* ehci_hcd_omap_probe - initialize TI-based HCDs
|
|
*
|
|
* Allocates basic resources for this USB host controller, and
|
|
* then invokes the start() method for the HCD associated with it
|
|
* through the hotplug entry's driver_data.
|
|
*/
|
|
static int ehci_hcd_omap_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct usbhs_omap_platform_data *pdata = dev_get_platdata(dev);
|
|
struct resource *res;
|
|
struct usb_hcd *hcd;
|
|
void __iomem *regs;
|
|
int ret;
|
|
int irq;
|
|
int i;
|
|
struct omap_hcd *omap;
|
|
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
|
|
if (!dev->parent) {
|
|
dev_err(dev, "Missing parent device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* For DT boot, get platform data from parent. i.e. usbhshost */
|
|
if (dev->of_node) {
|
|
pdata = dev_get_platdata(dev->parent);
|
|
dev->platform_data = pdata;
|
|
}
|
|
|
|
if (!pdata) {
|
|
dev_err(dev, "Missing platform data\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
dev_err(dev, "EHCI irq failed\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
regs = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(regs))
|
|
return PTR_ERR(regs);
|
|
|
|
/*
|
|
* Right now device-tree probed devices don't get dma_mask set.
|
|
* Since shared usb code relies on it, set it here for now.
|
|
* Once we have dma capability bindings this can go away.
|
|
*/
|
|
ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = -ENODEV;
|
|
hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
|
|
dev_name(dev));
|
|
if (!hcd) {
|
|
dev_err(dev, "Failed to create HCD\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
hcd->rsrc_start = res->start;
|
|
hcd->rsrc_len = resource_size(res);
|
|
hcd->regs = regs;
|
|
hcd_to_ehci(hcd)->caps = regs;
|
|
|
|
omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
|
|
omap->nports = pdata->nports;
|
|
|
|
platform_set_drvdata(pdev, hcd);
|
|
|
|
/* get the PHY devices if needed */
|
|
for (i = 0 ; i < omap->nports ; i++) {
|
|
struct usb_phy *phy;
|
|
|
|
/* get the PHY device */
|
|
if (dev->of_node)
|
|
phy = devm_usb_get_phy_by_phandle(dev, "phys", i);
|
|
else
|
|
phy = devm_usb_get_phy_dev(dev, i);
|
|
if (IS_ERR(phy)) {
|
|
/* Don't bail out if PHY is not absolutely necessary */
|
|
if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY)
|
|
continue;
|
|
|
|
ret = PTR_ERR(phy);
|
|
dev_err(dev, "Can't get PHY device for port %d: %d\n",
|
|
i, ret);
|
|
goto err_phy;
|
|
}
|
|
|
|
omap->phy[i] = phy;
|
|
|
|
if (pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY) {
|
|
usb_phy_init(omap->phy[i]);
|
|
/* bring PHY out of suspend */
|
|
usb_phy_set_suspend(omap->phy[i], 0);
|
|
}
|
|
}
|
|
|
|
pm_runtime_enable(dev);
|
|
pm_runtime_get_sync(dev);
|
|
|
|
/*
|
|
* An undocumented "feature" in the OMAP3 EHCI controller,
|
|
* causes suspended ports to be taken out of suspend when
|
|
* the USBCMD.Run/Stop bit is cleared (for example when
|
|
* we do ehci_bus_suspend).
|
|
* This breaks suspend-resume if the root-hub is allowed
|
|
* to suspend. Writing 1 to this undocumented register bit
|
|
* disables this feature and restores normal behavior.
|
|
*/
|
|
ehci_write(regs, EHCI_INSNREG04,
|
|
EHCI_INSNREG04_DISABLE_UNSUSPEND);
|
|
|
|
ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
|
|
if (ret) {
|
|
dev_err(dev, "failed to add hcd with err %d\n", ret);
|
|
goto err_pm_runtime;
|
|
}
|
|
device_wakeup_enable(hcd->self.controller);
|
|
|
|
/*
|
|
* Bring PHYs out of reset for non PHY modes.
|
|
* Even though HSIC mode is a PHY-less mode, the reset
|
|
* line exists between the chips and can be modelled
|
|
* as a PHY device for reset control.
|
|
*/
|
|
for (i = 0; i < omap->nports; i++) {
|
|
if (!omap->phy[i] ||
|
|
pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY)
|
|
continue;
|
|
|
|
usb_phy_init(omap->phy[i]);
|
|
/* bring PHY out of suspend */
|
|
usb_phy_set_suspend(omap->phy[i], 0);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_pm_runtime:
|
|
pm_runtime_put_sync(dev);
|
|
|
|
err_phy:
|
|
for (i = 0; i < omap->nports; i++) {
|
|
if (omap->phy[i])
|
|
usb_phy_shutdown(omap->phy[i]);
|
|
}
|
|
|
|
usb_put_hcd(hcd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
|
|
* @pdev: USB Host Controller being removed
|
|
*
|
|
* Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
|
|
* the HCD's stop() method. It is always called from a thread
|
|
* context, normally "rmmod", "apmd", or something similar.
|
|
*/
|
|
static int ehci_hcd_omap_remove(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct usb_hcd *hcd = dev_get_drvdata(dev);
|
|
struct omap_hcd *omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
|
|
int i;
|
|
|
|
usb_remove_hcd(hcd);
|
|
|
|
for (i = 0; i < omap->nports; i++) {
|
|
if (omap->phy[i])
|
|
usb_phy_shutdown(omap->phy[i]);
|
|
}
|
|
|
|
usb_put_hcd(hcd);
|
|
pm_runtime_put_sync(dev);
|
|
pm_runtime_disable(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id omap_ehci_dt_ids[] = {
|
|
{ .compatible = "ti,ehci-omap" },
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, omap_ehci_dt_ids);
|
|
|
|
static struct platform_driver ehci_hcd_omap_driver = {
|
|
.probe = ehci_hcd_omap_probe,
|
|
.remove = ehci_hcd_omap_remove,
|
|
.shutdown = usb_hcd_platform_shutdown,
|
|
/*.suspend = ehci_hcd_omap_suspend, */
|
|
/*.resume = ehci_hcd_omap_resume, */
|
|
.driver = {
|
|
.name = hcd_name,
|
|
.of_match_table = omap_ehci_dt_ids,
|
|
}
|
|
};
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int __init ehci_omap_init(void)
|
|
{
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
|
|
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
|
|
|
|
ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides);
|
|
return platform_driver_register(&ehci_hcd_omap_driver);
|
|
}
|
|
module_init(ehci_omap_init);
|
|
|
|
static void __exit ehci_omap_cleanup(void)
|
|
{
|
|
platform_driver_unregister(&ehci_hcd_omap_driver);
|
|
}
|
|
module_exit(ehci_omap_cleanup);
|
|
|
|
MODULE_ALIAS("platform:ehci-omap");
|
|
MODULE_AUTHOR("Texas Instruments, Inc.");
|
|
MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
|
|
MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
|
|
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|