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linux_dsm_epyc7002/drivers/usb/dwc3/dwc3-pci.c
Hans de Goede 5741022cbd usb: dwc3: pci: Add GPIO lookup table on platforms without ACPI GPIO resources 
Bay Trail / BYT SoCs do not have a builtin device-mode phy, instead
they require an external ULPI phy for device-mode.

Only some BYT devices have an external phy, but even on those devices
device-mode is not working because the dwc3 does not see the phy.

The problem is that the ACPI fwnode for the dwc3 does not contain the
expected GPIO resources for the GPIOs connected to the chip-select and
reset pins of the phy.

I've found the workaround which some Android x86 kernels use for this:
https://github.com/BORETS24/Kernel-for-Asus-Zenfone-2/blob/master/arch/x86/platform/intel-mid/device_libs/pci/platform_usb_otg.c
Which boils down to hardcoding the GPIOs for these devices.

The good news it that all boards (*) use the same GPIOs.

This commit fixes the ULPI phy not woring by adding a gpiod_lookup_table
call which adds a hardcoded mapping for BYT devices. Note that the mapping
added by gpiod_add_lookup_table is a fallback mapping, so boards which
properly provide GPIO resources in the ACPI firmware-node resources
will not use this.

*) Except for the first revision of the evalulation-kit, which normal users
don't have

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2018-07-26 13:54:15 +03:00

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// SPDX-License-Identifier: GPL-2.0
/**
* dwc3-pci.c - PCI Specific glue layer
*
* Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
*
* Authors: Felipe Balbi <balbi@ti.com>,
* Sebastian Andrzej Siewior <bigeasy@linutronix.de>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/workqueue.h>
#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#define PCI_DEVICE_ID_INTEL_BYT 0x0f37
#define PCI_DEVICE_ID_INTEL_MRFLD 0x119e
#define PCI_DEVICE_ID_INTEL_BSW 0x22b7
#define PCI_DEVICE_ID_INTEL_SPTLP 0x9d30
#define PCI_DEVICE_ID_INTEL_SPTH 0xa130
#define PCI_DEVICE_ID_INTEL_BXT 0x0aaa
#define PCI_DEVICE_ID_INTEL_BXT_M 0x1aaa
#define PCI_DEVICE_ID_INTEL_APL 0x5aaa
#define PCI_DEVICE_ID_INTEL_KBP 0xa2b0
#define PCI_DEVICE_ID_INTEL_GLK 0x31aa
#define PCI_DEVICE_ID_INTEL_CNPLP 0x9dee
#define PCI_DEVICE_ID_INTEL_CNPH 0xa36e
#define PCI_DEVICE_ID_INTEL_ICLLP 0x34ee
#define PCI_INTEL_BXT_DSM_GUID "732b85d5-b7a7-4a1b-9ba0-4bbd00ffd511"
#define PCI_INTEL_BXT_FUNC_PMU_PWR 4
#define PCI_INTEL_BXT_STATE_D0 0
#define PCI_INTEL_BXT_STATE_D3 3
/**
* struct dwc3_pci - Driver private structure
* @dwc3: child dwc3 platform_device
* @pci: our link to PCI bus
* @guid: _DSM GUID
* @has_dsm_for_pm: true for devices which need to run _DSM on runtime PM
*/
struct dwc3_pci {
struct platform_device *dwc3;
struct pci_dev *pci;
guid_t guid;
unsigned int has_dsm_for_pm:1;
struct work_struct wakeup_work;
};
static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
static const struct acpi_gpio_params cs_gpios = { 1, 0, false };
static const struct acpi_gpio_mapping acpi_dwc3_byt_gpios[] = {
{ "reset-gpios", &reset_gpios, 1 },
{ "cs-gpios", &cs_gpios, 1 },
{ },
};
static struct gpiod_lookup_table platform_bytcr_gpios = {
.dev_id = "0000:00:16.0",
.table = {
GPIO_LOOKUP("INT33FC:00", 54, "reset", GPIO_ACTIVE_HIGH),
GPIO_LOOKUP("INT33FC:02", 14, "cs", GPIO_ACTIVE_HIGH),
{}
},
};
static int dwc3_pci_quirks(struct dwc3_pci *dwc)
{
struct platform_device *dwc3 = dwc->dwc3;
struct pci_dev *pdev = dwc->pci;
if (pdev->vendor == PCI_VENDOR_ID_AMD &&
pdev->device == PCI_DEVICE_ID_AMD_NL_USB) {
struct property_entry properties[] = {
PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
PROPERTY_ENTRY_U8("snps,lpm-nyet-threshold", 0xf),
PROPERTY_ENTRY_BOOL("snps,u2exit_lfps_quirk"),
PROPERTY_ENTRY_BOOL("snps,u2ss_inp3_quirk"),
PROPERTY_ENTRY_BOOL("snps,req_p1p2p3_quirk"),
PROPERTY_ENTRY_BOOL("snps,del_p1p2p3_quirk"),
PROPERTY_ENTRY_BOOL("snps,del_phy_power_chg_quirk"),
PROPERTY_ENTRY_BOOL("snps,lfps_filter_quirk"),
PROPERTY_ENTRY_BOOL("snps,rx_detect_poll_quirk"),
PROPERTY_ENTRY_BOOL("snps,tx_de_emphasis_quirk"),
PROPERTY_ENTRY_U8("snps,tx_de_emphasis", 1),
/*
* FIXME these quirks should be removed when AMD NL
* tapes out
*/
PROPERTY_ENTRY_BOOL("snps,disable_scramble_quirk"),
PROPERTY_ENTRY_BOOL("snps,dis_u3_susphy_quirk"),
PROPERTY_ENTRY_BOOL("snps,dis_u2_susphy_quirk"),
PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
{ },
};
return platform_device_add_properties(dwc3, properties);
}
if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
int ret;
struct property_entry properties[] = {
PROPERTY_ENTRY_STRING("dr_mode", "peripheral"),
PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
{ }
};
ret = platform_device_add_properties(dwc3, properties);
if (ret < 0)
return ret;
if (pdev->device == PCI_DEVICE_ID_INTEL_BXT ||
pdev->device == PCI_DEVICE_ID_INTEL_BXT_M) {
guid_parse(PCI_INTEL_BXT_DSM_GUID, &dwc->guid);
dwc->has_dsm_for_pm = true;
}
if (pdev->device == PCI_DEVICE_ID_INTEL_BYT) {
struct gpio_desc *gpio;
ret = devm_acpi_dev_add_driver_gpios(&pdev->dev,
acpi_dwc3_byt_gpios);
if (ret)
dev_dbg(&pdev->dev, "failed to add mapping table\n");
/*
* A lot of BYT devices lack ACPI resource entries for
* the GPIOs, add a fallback mapping to the reference
* design GPIOs which all boards seem to use.
*/
gpiod_add_lookup_table(&platform_bytcr_gpios);
/*
* These GPIOs will turn on the USB2 PHY. Note that we have to
* put the gpio descriptors again here because the phy driver
* might want to grab them, too.
*/
gpio = gpiod_get_optional(&pdev->dev, "cs", GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
gpiod_set_value_cansleep(gpio, 1);
gpiod_put(gpio);
gpio = gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
if (gpio) {
gpiod_set_value_cansleep(gpio, 1);
gpiod_put(gpio);
usleep_range(10000, 11000);
}
}
}
return 0;
}
#ifdef CONFIG_PM
static void dwc3_pci_resume_work(struct work_struct *work)
{
struct dwc3_pci *dwc = container_of(work, struct dwc3_pci, wakeup_work);
struct platform_device *dwc3 = dwc->dwc3;
int ret;
ret = pm_runtime_get_sync(&dwc3->dev);
if (ret)
return;
pm_runtime_mark_last_busy(&dwc3->dev);
pm_runtime_put_sync_autosuspend(&dwc3->dev);
}
#endif
static int dwc3_pci_probe(struct pci_dev *pci,
const struct pci_device_id *id)
{
struct dwc3_pci *dwc;
struct resource res[2];
int ret;
struct device *dev = &pci->dev;
ret = pcim_enable_device(pci);
if (ret) {
dev_err(dev, "failed to enable pci device\n");
return -ENODEV;
}
pci_set_master(pci);
dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
if (!dwc)
return -ENOMEM;
dwc->dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
if (!dwc->dwc3)
return -ENOMEM;
memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
res[0].start = pci_resource_start(pci, 0);
res[0].end = pci_resource_end(pci, 0);
res[0].name = "dwc_usb3";
res[0].flags = IORESOURCE_MEM;
res[1].start = pci->irq;
res[1].name = "dwc_usb3";
res[1].flags = IORESOURCE_IRQ;
ret = platform_device_add_resources(dwc->dwc3, res, ARRAY_SIZE(res));
if (ret) {
dev_err(dev, "couldn't add resources to dwc3 device\n");
goto err;
}
dwc->pci = pci;
dwc->dwc3->dev.parent = dev;
ACPI_COMPANION_SET(&dwc->dwc3->dev, ACPI_COMPANION(dev));
ret = dwc3_pci_quirks(dwc);
if (ret)
goto err;
ret = platform_device_add(dwc->dwc3);
if (ret) {
dev_err(dev, "failed to register dwc3 device\n");
goto err;
}
device_init_wakeup(dev, true);
pci_set_drvdata(pci, dwc);
pm_runtime_put(dev);
#ifdef CONFIG_PM
INIT_WORK(&dwc->wakeup_work, dwc3_pci_resume_work);
#endif
return 0;
err:
platform_device_put(dwc->dwc3);
return ret;
}
static void dwc3_pci_remove(struct pci_dev *pci)
{
struct dwc3_pci *dwc = pci_get_drvdata(pci);
gpiod_remove_lookup_table(&platform_bytcr_gpios);
#ifdef CONFIG_PM
cancel_work_sync(&dwc->wakeup_work);
#endif
device_init_wakeup(&pci->dev, false);
pm_runtime_get(&pci->dev);
platform_device_unregister(dwc->dwc3);
}
static const struct pci_device_id dwc3_pci_id_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BSW), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BYT), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MRFLD), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SPTLP), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SPTH), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BXT), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BXT_M), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_APL), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_KBP), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_GLK), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CNPLP), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CNPH), },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICLLP), },
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_NL_USB), },
{ } /* Terminating Entry */
};
MODULE_DEVICE_TABLE(pci, dwc3_pci_id_table);
#if defined(CONFIG_PM) || defined(CONFIG_PM_SLEEP)
static int dwc3_pci_dsm(struct dwc3_pci *dwc, int param)
{
union acpi_object *obj;
union acpi_object tmp;
union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
if (!dwc->has_dsm_for_pm)
return 0;
tmp.type = ACPI_TYPE_INTEGER;
tmp.integer.value = param;
obj = acpi_evaluate_dsm(ACPI_HANDLE(&dwc->pci->dev), &dwc->guid,
1, PCI_INTEL_BXT_FUNC_PMU_PWR, &argv4);
if (!obj) {
dev_err(&dwc->pci->dev, "failed to evaluate _DSM\n");
return -EIO;
}
ACPI_FREE(obj);
return 0;
}
#endif /* CONFIG_PM || CONFIG_PM_SLEEP */
#ifdef CONFIG_PM
static int dwc3_pci_runtime_suspend(struct device *dev)
{
struct dwc3_pci *dwc = dev_get_drvdata(dev);
if (device_can_wakeup(dev))
return dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D3);
return -EBUSY;
}
static int dwc3_pci_runtime_resume(struct device *dev)
{
struct dwc3_pci *dwc = dev_get_drvdata(dev);
int ret;
ret = dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D0);
if (ret)
return ret;
queue_work(pm_wq, &dwc->wakeup_work);
return 0;
}
#endif /* CONFIG_PM */
#ifdef CONFIG_PM_SLEEP
static int dwc3_pci_suspend(struct device *dev)
{
struct dwc3_pci *dwc = dev_get_drvdata(dev);
return dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D3);
}
static int dwc3_pci_resume(struct device *dev)
{
struct dwc3_pci *dwc = dev_get_drvdata(dev);
return dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D0);
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops dwc3_pci_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(dwc3_pci_suspend, dwc3_pci_resume)
SET_RUNTIME_PM_OPS(dwc3_pci_runtime_suspend, dwc3_pci_runtime_resume,
NULL)
};
static struct pci_driver dwc3_pci_driver = {
.name = "dwc3-pci",
.id_table = dwc3_pci_id_table,
.probe = dwc3_pci_probe,
.remove = dwc3_pci_remove,
.driver = {
.pm = &dwc3_pci_dev_pm_ops,
}
};
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 PCI Glue Layer");
module_pci_driver(dwc3_pci_driver);
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