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linux/drivers/usb/dwc2/platform.c

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// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
* platform.c - DesignWare HS OTG Controller platform driver
*
* Copyright (C) Matthijs Kooijman <matthijs@stdin.nl>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the above-listed copyright holders may not be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* ALTERNATIVELY, this software may be distributed under the terms of the
* GNU General Public License ("GPL") as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/of_device.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#include <linux/platform_data/s3c-hsotg.h>
#include <linux/reset.h>
#include <linux/usb/of.h>
#include "core.h"
#include "hcd.h"
#include "debug.h"
static const char dwc2_driver_name[] = "dwc2";
/*
* Check the dr_mode against the module configuration and hardware
* capabilities.
*
* The hardware, module, and dr_mode, can each be set to host, device,
* or otg. Check that all these values are compatible and adjust the
* value of dr_mode if possible.
*
* actual
* HW MOD dr_mode dr_mode
* ------------------------------
* HST HST any : HST
* HST DEV any : ---
* HST OTG any : HST
*
* DEV HST any : ---
* DEV DEV any : DEV
* DEV OTG any : DEV
*
* OTG HST any : HST
* OTG DEV any : DEV
* OTG OTG any : dr_mode
*/
static int dwc2_get_dr_mode(struct dwc2_hsotg *hsotg)
{
enum usb_dr_mode mode;
hsotg->dr_mode = usb_get_dr_mode(hsotg->dev);
if (hsotg->dr_mode == USB_DR_MODE_UNKNOWN)
hsotg->dr_mode = USB_DR_MODE_OTG;
mode = hsotg->dr_mode;
if (dwc2_hw_is_device(hsotg)) {
if (IS_ENABLED(CONFIG_USB_DWC2_HOST)) {
dev_err(hsotg->dev,
"Controller does not support host mode.\n");
return -EINVAL;
}
mode = USB_DR_MODE_PERIPHERAL;
} else if (dwc2_hw_is_host(hsotg)) {
if (IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL)) {
dev_err(hsotg->dev,
"Controller does not support device mode.\n");
return -EINVAL;
}
mode = USB_DR_MODE_HOST;
} else {
if (IS_ENABLED(CONFIG_USB_DWC2_HOST))
mode = USB_DR_MODE_HOST;
else if (IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL))
mode = USB_DR_MODE_PERIPHERAL;
}
if (mode != hsotg->dr_mode) {
dev_warn(hsotg->dev,
"Configuration mismatch. dr_mode forced to %s\n",
mode == USB_DR_MODE_HOST ? "host" : "device");
hsotg->dr_mode = mode;
}
return 0;
}
static int __dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
{
struct platform_device *pdev = to_platform_device(hsotg->dev);
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
hsotg->supplies);
if (ret)
return ret;
if (hsotg->clk) {
ret = clk_prepare_enable(hsotg->clk);
if (ret)
return ret;
}
if (hsotg->uphy) {
ret = usb_phy_init(hsotg->uphy);
} else if (hsotg->plat && hsotg->plat->phy_init) {
ret = hsotg->plat->phy_init(pdev, hsotg->plat->phy_type);
} else {
ret = phy_power_on(hsotg->phy);
if (ret == 0)
ret = phy_init(hsotg->phy);
}
return ret;
}
/**
* dwc2_lowlevel_hw_enable - enable platform lowlevel hw resources
* @hsotg: The driver state
*
* A wrapper for platform code responsible for controlling
* low-level USB platform resources (phy, clock, regulators)
*/
int dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
{
int ret = __dwc2_lowlevel_hw_enable(hsotg);
if (ret == 0)
hsotg->ll_hw_enabled = true;
return ret;
}
static int __dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
{
struct platform_device *pdev = to_platform_device(hsotg->dev);
int ret = 0;
if (hsotg->uphy) {
usb_phy_shutdown(hsotg->uphy);
} else if (hsotg->plat && hsotg->plat->phy_exit) {
ret = hsotg->plat->phy_exit(pdev, hsotg->plat->phy_type);
} else {
ret = phy_exit(hsotg->phy);
if (ret == 0)
ret = phy_power_off(hsotg->phy);
}
if (ret)
return ret;
if (hsotg->clk)
clk_disable_unprepare(hsotg->clk);
ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
hsotg->supplies);
return ret;
}
/**
* dwc2_lowlevel_hw_disable - disable platform lowlevel hw resources
* @hsotg: The driver state
*
* A wrapper for platform code responsible for controlling
* low-level USB platform resources (phy, clock, regulators)
*/
int dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
{
int ret = __dwc2_lowlevel_hw_disable(hsotg);
if (ret == 0)
hsotg->ll_hw_enabled = false;
return ret;
}
static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
{
int i, ret;
hsotg->reset = devm_reset_control_get_optional(hsotg->dev, "dwc2");
if (IS_ERR(hsotg->reset)) {
ret = PTR_ERR(hsotg->reset);
dev_err(hsotg->dev, "error getting reset control %d\n", ret);
return ret;
}
reset_control_deassert(hsotg->reset);
hsotg->reset_ecc = devm_reset_control_get_optional(hsotg->dev, "dwc2-ecc");
if (IS_ERR(hsotg->reset_ecc)) {
ret = PTR_ERR(hsotg->reset_ecc);
dev_err(hsotg->dev, "error getting reset control for ecc %d\n", ret);
return ret;
}
reset_control_deassert(hsotg->reset_ecc);
/* Set default UTMI width */
hsotg->phyif = GUSBCFG_PHYIF16;
/*
* Attempt to find a generic PHY, then look for an old style
* USB PHY and then fall back to pdata
*/
hsotg->phy = devm_phy_get(hsotg->dev, "usb2-phy");
if (IS_ERR(hsotg->phy)) {
ret = PTR_ERR(hsotg->phy);
switch (ret) {
case -ENODEV:
case -ENOSYS:
hsotg->phy = NULL;
break;
case -EPROBE_DEFER:
return ret;
default:
dev_err(hsotg->dev, "error getting phy %d\n", ret);
return ret;
}
}
if (!hsotg->phy) {
hsotg->uphy = devm_usb_get_phy(hsotg->dev, USB_PHY_TYPE_USB2);
if (IS_ERR(hsotg->uphy)) {
ret = PTR_ERR(hsotg->uphy);
switch (ret) {
case -ENODEV:
case -ENXIO:
hsotg->uphy = NULL;
break;
case -EPROBE_DEFER:
return ret;
default:
dev_err(hsotg->dev, "error getting usb phy %d\n",
ret);
return ret;
}
}
}
hsotg->plat = dev_get_platdata(hsotg->dev);
if (hsotg->phy) {
/*
* If using the generic PHY framework, check if the PHY bus
* width is 8-bit and set the phyif appropriately.
*/
if (phy_get_bus_width(hsotg->phy) == 8)
hsotg->phyif = GUSBCFG_PHYIF8;
}
/* Clock */
hsotg->clk = devm_clk_get(hsotg->dev, "otg");
if (IS_ERR(hsotg->clk)) {
hsotg->clk = NULL;
dev_dbg(hsotg->dev, "cannot get otg clock\n");
}
/* Regulators */
for (i = 0; i < ARRAY_SIZE(hsotg->supplies); i++)
hsotg->supplies[i].supply = dwc2_hsotg_supply_names[i];
ret = devm_regulator_bulk_get(hsotg->dev, ARRAY_SIZE(hsotg->supplies),
hsotg->supplies);
if (ret) {
dev_err(hsotg->dev, "failed to request supplies: %d\n", ret);
return ret;
}
return 0;
}
/**
* dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
* DWC_otg driver
*
* @dev: Platform device
*
* This routine is called, for example, when the rmmod command is executed. The
* device may or may not be electrically present. If it is present, the driver
* stops device processing. Any resources used on behalf of this device are
* freed.
*/
static int dwc2_driver_remove(struct platform_device *dev)
{
struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
dwc2_debugfs_exit(hsotg);
if (hsotg->hcd_enabled)
dwc2_hcd_remove(hsotg);
if (hsotg->gadget_enabled)
dwc2_hsotg_remove(hsotg);
if (hsotg->ll_hw_enabled)
dwc2_lowlevel_hw_disable(hsotg);
reset_control_assert(hsotg->reset);
reset_control_assert(hsotg->reset_ecc);
return 0;
}
/**
* dwc2_driver_shutdown() - Called on device shutdown
*
* @dev: Platform device
*
* In specific conditions (involving usb hubs) dwc2 devices can create a
* lot of interrupts, even to the point of overwhelming devices running
* at low frequencies. Some devices need to do special clock handling
* at shutdown-time which may bring the system clock below the threshold
* of being able to handle the dwc2 interrupts. Disabling dwc2-irqs
* prevents reboots/poweroffs from getting stuck in such cases.
*/
static void dwc2_driver_shutdown(struct platform_device *dev)
{
struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
disable_irq(hsotg->irq);
}
/**
* dwc2_check_core_endianness() - Returns true if core and AHB have
* opposite endianness.
* @hsotg: Programming view of the DWC_otg controller.
*/
static bool dwc2_check_core_endianness(struct dwc2_hsotg *hsotg)
{
u32 snpsid;
snpsid = ioread32(hsotg->regs + GSNPSID);
if ((snpsid & GSNPSID_ID_MASK) == DWC2_OTG_ID ||
(snpsid & GSNPSID_ID_MASK) == DWC2_FS_IOT_ID ||
(snpsid & GSNPSID_ID_MASK) == DWC2_HS_IOT_ID)
return false;
return true;
}
/**
* dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
* driver
*
* @dev: Platform device
*
* This routine creates the driver components required to control the device
* (core, HCD, and PCD) and initializes the device. The driver components are
* stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved
* in the device private data. This allows the driver to access the dwc2_hsotg
* structure on subsequent calls to driver methods for this device.
*/
static int dwc2_driver_probe(struct platform_device *dev)
{
struct dwc2_hsotg *hsotg;
struct resource *res;
int retval;
hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
if (!hsotg)
return -ENOMEM;
hsotg->dev = &dev->dev;
/*
* Use reasonable defaults so platforms don't have to provide these.
*/
if (!dev->dev.dma_mask)
dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
retval = dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32));
if (retval) {
dev_err(&dev->dev, "can't set coherent DMA mask: %d\n", retval);
return retval;
}
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
hsotg->regs = devm_ioremap_resource(&dev->dev, res);
if (IS_ERR(hsotg->regs))
return PTR_ERR(hsotg->regs);
dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
(unsigned long)res->start, hsotg->regs);
retval = dwc2_lowlevel_hw_init(hsotg);
if (retval)
return retval;
spin_lock_init(&hsotg->lock);
hsotg->irq = platform_get_irq(dev, 0);
if (hsotg->irq < 0) {
dev_err(&dev->dev, "missing IRQ resource\n");
return hsotg->irq;
}
dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
hsotg->irq);
retval = devm_request_irq(hsotg->dev, hsotg->irq,
dwc2_handle_common_intr, IRQF_SHARED,
dev_name(hsotg->dev), hsotg);
if (retval)
return retval;
hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
if (IS_ERR(hsotg->vbus_supply)) {
retval = PTR_ERR(hsotg->vbus_supply);
hsotg->vbus_supply = NULL;
if (retval != -ENODEV)
return retval;
}
retval = dwc2_lowlevel_hw_enable(hsotg);
if (retval)
return retval;
hsotg->needs_byte_swap = dwc2_check_core_endianness(hsotg);
retval = dwc2_get_dr_mode(hsotg);
if (retval)
goto error;
/*
* Reset before dwc2_get_hwparams() then it could get power-on real
* reset value form registers.
*/
retval = dwc2_core_reset(hsotg, false);
if (retval)
goto error;
/* Detect config values from hardware */
retval = dwc2_get_hwparams(hsotg);
if (retval)
goto error;
/*
* For OTG cores, set the force mode bits to reflect the value
* of dr_mode. Force mode bits should not be touched at any
* other time after this.
*/
dwc2_force_dr_mode(hsotg);
retval = dwc2_init_params(hsotg);
if (retval)
goto error;
if (hsotg->dr_mode != USB_DR_MODE_HOST) {
retval = dwc2_gadget_init(hsotg);
if (retval)
goto error;
hsotg->gadget_enabled = 1;
}
if (hsotg->dr_mode != USB_DR_MODE_PERIPHERAL) {
retval = dwc2_hcd_init(hsotg);
if (retval) {
if (hsotg->gadget_enabled)
dwc2_hsotg_remove(hsotg);
goto error;
}
hsotg->hcd_enabled = 1;
}
platform_set_drvdata(dev, hsotg);
hsotg->hibernated = 0;
dwc2_debugfs_init(hsotg);
/* Gadget code manages lowlevel hw on its own */
if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)
dwc2_lowlevel_hw_disable(hsotg);
return 0;
error:
dwc2_lowlevel_hw_disable(hsotg);
return retval;
}
static int __maybe_unused dwc2_suspend(struct device *dev)
{
struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
int ret = 0;
if (dwc2_is_device_mode(dwc2))
dwc2_hsotg_suspend(dwc2);
if (dwc2->ll_hw_enabled)
ret = __dwc2_lowlevel_hw_disable(dwc2);
return ret;
}
static int __maybe_unused dwc2_resume(struct device *dev)
{
struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
int ret = 0;
if (dwc2->ll_hw_enabled) {
ret = __dwc2_lowlevel_hw_enable(dwc2);
if (ret)
return ret;
}
if (dwc2_is_device_mode(dwc2))
ret = dwc2_hsotg_resume(dwc2);
return ret;
}
static const struct dev_pm_ops dwc2_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(dwc2_suspend, dwc2_resume)
};
static struct platform_driver dwc2_platform_driver = {
.driver = {
.name = dwc2_driver_name,
.of_match_table = dwc2_of_match_table,
.pm = &dwc2_dev_pm_ops,
},
.probe = dwc2_driver_probe,
.remove = dwc2_driver_remove,
.shutdown = dwc2_driver_shutdown,
};
module_platform_driver(dwc2_platform_driver);
MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>");
MODULE_LICENSE("Dual BSD/GPL");
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