/**
 * 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>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2  of
 * the License 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.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>
#include <linux/acpi.h>
#include <linux/delay.h>

#define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3		0xabcd
#define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI	0xabce
#define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31	0xabcf
#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_INTEL_BXT_DSM_UUID		"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
 * @uuid: _DSM UUID
 * @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;

	u8 uuid[16];

	unsigned int has_dsm_for_pm:1;
};

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 int dwc3_pci_quirks(struct dwc3_pci *dwc)
{
	struct platform_device		*dwc3 = dwc->dwc3;
	struct pci_dev			*pdev = dwc->pci;
	int				ret;

	struct property_entry sysdev_property[] = {
		PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
		{ },
	};

	ret = platform_device_add_properties(dwc3, sysdev_property);
	if (ret)
		return ret;

	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"),
			{ },
		};

		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"),
			{ }
		};

		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) {
			acpi_str_to_uuid(PCI_INTEL_BXT_DSM_UUID, dwc->uuid);
			dwc->has_dsm_for_pm = true;
		}

		if (pdev->device == PCI_DEVICE_ID_INTEL_BYT) {
			struct gpio_desc *gpio;

			acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
					acpi_dwc3_byt_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);
			}
		}
	}

	if (pdev->vendor == PCI_VENDOR_ID_SYNOPSYS &&
	    (pdev->device == PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3 ||
	     pdev->device == PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI ||
	     pdev->device == PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31)) {
		struct property_entry properties[] = {
			PROPERTY_ENTRY_BOOL("snps,usb3_lpm_capable"),
			PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
			PROPERTY_ENTRY_BOOL("snps,dis_enblslpm_quirk"),
			{ },
		};

		return platform_device_add_properties(dwc3, properties);
	}

	return 0;
}

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");
		return ret;
	}

	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);
	device_set_run_wake(dev, true);
	pci_set_drvdata(pci, dwc);
	pm_runtime_put(dev);

	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);

	device_init_wakeup(&pci->dev, false);
	pm_runtime_get(&pci->dev);
	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pci->dev));
	platform_device_unregister(dwc->dwc3);
}

static const struct pci_device_id dwc3_pci_id_table[] = {
	{
		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
				PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3),
	},
	{
		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
				PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI),
	},
	{
		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
				PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31),
	},
	{ 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_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->uuid,
			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_run_wake(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);
	struct platform_device	*dwc3 = dwc->dwc3;
	int			ret;

	ret = dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D0);
	if (ret)
		return ret;

	return pm_runtime_get(&dwc3->dev);
}
#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 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);