drivers/scsi/ufs/ufshcd-pci.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Universal Flash Storage Host controller PCI glue driver
  *
  * This code is based on drivers/scsi/ufs/ufshcd-pci.c
  * Copyright (C) 2011-2013 Samsung India Software Operations
  *
  * Authors:
  *	Santosh Yaraganavi <santosh.sy@samsung.com>
  *	Vinayak Holikatti <h.vinayak@samsung.com>
  */

 #include "ufshcd.h"
 #include <linux/pci.h>
 #include <linux/pm_runtime.h>
 #include <linux/pm_qos.h>
 #include <linux/debugfs.h>
 #include <linux/uuid.h>
 #include <linux/acpi.h>
 #include <linux/gpio/consumer.h>

 struct ufs_host {
 	void (*late_init)(struct ufs_hba *hba);
 };

 enum {
 	INTEL_DSM_FNS		=  0,
 	INTEL_DSM_RESET		=  1,
 };

 struct intel_host {
 	struct ufs_host ufs_host;
 	u32		dsm_fns;
 	u32		active_ltr;
 	u32		idle_ltr;
 	struct dentry	*debugfs_root;
 	struct gpio_desc *reset_gpio;
 };

 static const guid_t intel_dsm_guid =
 	GUID_INIT(0x1A4832A0, 0x7D03, 0x43CA,
 		  0xB0, 0x20, 0xF6, 0xDC, 0xD1, 0x2A, 0x19, 0x50);

 static int __intel_dsm(struct intel_host *intel_host, struct device *dev,
 		       unsigned int fn, u32 *result)
 {
 	union acpi_object *obj;
 	int err = 0;
 	size_t len;

 	obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &intel_dsm_guid, 0, fn, NULL);
 	if (!obj)
 		return -EOPNOTSUPP;

 	if (obj->type != ACPI_TYPE_BUFFER || obj->buffer.length < 1) {
 		err = -EINVAL;
 		goto out;
 	}

 	len = min_t(size_t, obj->buffer.length, 4);

 	*result = 0;
 	memcpy(result, obj->buffer.pointer, len);
 out:
 	ACPI_FREE(obj);

 	return err;
 }

 static int intel_dsm(struct intel_host *intel_host, struct device *dev,
 		     unsigned int fn, u32 *result)
 {
 	if (fn > 31 || !(intel_host->dsm_fns & (1 << fn)))
 		return -EOPNOTSUPP;

 	return __intel_dsm(intel_host, dev, fn, result);
 }

 static void intel_dsm_init(struct intel_host *intel_host, struct device *dev)
 {
 	int err;

 	err = __intel_dsm(intel_host, dev, INTEL_DSM_FNS, &intel_host->dsm_fns);
 	dev_dbg(dev, "DSM fns %#x, error %d\n", intel_host->dsm_fns, err);
 }

 static int ufs_intel_hce_enable_notify(struct ufs_hba *hba,
 				       enum ufs_notify_change_status status)
 {
 	/* Cannot enable ICE until after HC enable */
 	if (status == POST_CHANGE && hba->caps & UFSHCD_CAP_CRYPTO) {
 		u32 hce = ufshcd_readl(hba, REG_CONTROLLER_ENABLE);

 		hce |= CRYPTO_GENERAL_ENABLE;
 		ufshcd_writel(hba, hce, REG_CONTROLLER_ENABLE);
 	}

 	return 0;
 }

 static int ufs_intel_disable_lcc(struct ufs_hba *hba)
 {
 	u32 attr = UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE);
 	u32 lcc_enable = 0;

 	ufshcd_dme_get(hba, attr, &lcc_enable);
 	if (lcc_enable)
 		ufshcd_disable_host_tx_lcc(hba);

 	return 0;
 }

 static int ufs_intel_link_startup_notify(struct ufs_hba *hba,
 					 enum ufs_notify_change_status status)
 {
 	int err = 0;

 	switch (status) {
 	case PRE_CHANGE:
 		err = ufs_intel_disable_lcc(hba);
 		break;
 	case POST_CHANGE:
 		break;
 	default:
 		break;
 	}

 	return err;
 }

 static int ufs_intel_set_lanes(struct ufs_hba *hba, u32 lanes)
 {
 	struct ufs_pa_layer_attr pwr_info = hba->pwr_info;
 	int ret;

 	pwr_info.lane_rx = lanes;
 	pwr_info.lane_tx = lanes;
 	ret = ufshcd_config_pwr_mode(hba, &pwr_info);
 	if (ret)
 		dev_err(hba->dev, "%s: Setting %u lanes, err = %d\n",
 			__func__, lanes, ret);
 	return ret;
 }

 static int ufs_intel_lkf_pwr_change_notify(struct ufs_hba *hba,
 				enum ufs_notify_change_status status,
 				struct ufs_pa_layer_attr *dev_max_params,
 				struct ufs_pa_layer_attr *dev_req_params)
 {
 	int err = 0;

 	switch (status) {
 	case PRE_CHANGE:
 		if (ufshcd_is_hs_mode(dev_max_params) &&
 		    (hba->pwr_info.lane_rx != 2 || hba->pwr_info.lane_tx != 2))
 			ufs_intel_set_lanes(hba, 2);
 		memcpy(dev_req_params, dev_max_params, sizeof(*dev_req_params));
 		break;
 	case POST_CHANGE:
 		if (ufshcd_is_hs_mode(dev_req_params)) {
 			u32 peer_granularity;

 			usleep_range(1000, 1250);
 			err = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_GRANULARITY),
 						  &peer_granularity);
 		}
 		break;
 	default:
 		break;
 	}

 	return err;
 }

 static int ufs_intel_lkf_apply_dev_quirks(struct ufs_hba *hba)
 {
 	u32 granularity, peer_granularity;
 	u32 pa_tactivate, peer_pa_tactivate;
 	int ret;

 	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_GRANULARITY), &granularity);
 	if (ret)
 		goto out;

 	ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_GRANULARITY), &peer_granularity);
 	if (ret)
 		goto out;

 	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_TACTIVATE), &pa_tactivate);
 	if (ret)
 		goto out;

 	ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_TACTIVATE), &peer_pa_tactivate);
 	if (ret)
 		goto out;

 	if (granularity == peer_granularity) {
 		u32 new_peer_pa_tactivate = pa_tactivate + 2;

 		ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(PA_TACTIVATE), new_peer_pa_tactivate);
 	}
 out:
 	return ret;
 }

 #define INTEL_ACTIVELTR		0x804
 #define INTEL_IDLELTR		0x808

 #define INTEL_LTR_REQ		BIT(15)
 #define INTEL_LTR_SCALE_MASK	GENMASK(11, 10)
 #define INTEL_LTR_SCALE_1US	(2 << 10)
 #define INTEL_LTR_SCALE_32US	(3 << 10)
 #define INTEL_LTR_VALUE_MASK	GENMASK(9, 0)

 static void intel_cache_ltr(struct ufs_hba *hba)
 {
 	struct intel_host *host = ufshcd_get_variant(hba);

 	host->active_ltr = readl(hba->mmio_base + INTEL_ACTIVELTR);
 	host->idle_ltr = readl(hba->mmio_base + INTEL_IDLELTR);
 }

 static void intel_ltr_set(struct device *dev, s32 val)
 {
 	struct ufs_hba *hba = dev_get_drvdata(dev);
 	struct intel_host *host = ufshcd_get_variant(hba);
 	u32 ltr;

 	pm_runtime_get_sync(dev);

 	/*
 	 * Program latency tolerance (LTR) accordingly what has been asked
 	 * by the PM QoS layer or disable it in case we were passed
 	 * negative value or PM_QOS_LATENCY_ANY.
 	 */
 	ltr = readl(hba->mmio_base + INTEL_ACTIVELTR);

 	if (val == PM_QOS_LATENCY_ANY || val < 0) {
 		ltr &= ~INTEL_LTR_REQ;
 	} else {
 		ltr |= INTEL_LTR_REQ;
 		ltr &= ~INTEL_LTR_SCALE_MASK;
 		ltr &= ~INTEL_LTR_VALUE_MASK;

 		if (val > INTEL_LTR_VALUE_MASK) {
 			val >>= 5;
 			if (val > INTEL_LTR_VALUE_MASK)
 				val = INTEL_LTR_VALUE_MASK;
 			ltr |= INTEL_LTR_SCALE_32US | val;
 		} else {
 			ltr |= INTEL_LTR_SCALE_1US | val;
 		}
 	}

 	if (ltr == host->active_ltr)
 		goto out;

 	writel(ltr, hba->mmio_base + INTEL_ACTIVELTR);
 	writel(ltr, hba->mmio_base + INTEL_IDLELTR);

 	/* Cache the values into intel_host structure */
 	intel_cache_ltr(hba);
 out:
 	pm_runtime_put(dev);
 }

 static void intel_ltr_expose(struct device *dev)
 {
 	dev->power.set_latency_tolerance = intel_ltr_set;
 	dev_pm_qos_expose_latency_tolerance(dev);
 }

 static void intel_ltr_hide(struct device *dev)
 {
 	dev_pm_qos_hide_latency_tolerance(dev);
 	dev->power.set_latency_tolerance = NULL;
 }

 static void intel_add_debugfs(struct ufs_hba *hba)
 {
 	struct dentry *dir = debugfs_create_dir(dev_name(hba->dev), NULL);
 	struct intel_host *host = ufshcd_get_variant(hba);

 	intel_cache_ltr(hba);

 	host->debugfs_root = dir;
 	debugfs_create_x32("active_ltr", 0444, dir, &host->active_ltr);
 	debugfs_create_x32("idle_ltr", 0444, dir, &host->idle_ltr);
 }

 static void intel_remove_debugfs(struct ufs_hba *hba)
 {
 	struct intel_host *host = ufshcd_get_variant(hba);

 	debugfs_remove_recursive(host->debugfs_root);
 }

 static int ufs_intel_device_reset(struct ufs_hba *hba)
 {
 	struct intel_host *host = ufshcd_get_variant(hba);

 	if (host->dsm_fns & INTEL_DSM_RESET) {
 		u32 result = 0;
 		int err;

 		err = intel_dsm(host, hba->dev, INTEL_DSM_RESET, &result);
 		if (!err && !result)
 			err = -EIO;
 		if (err)
 			dev_err(hba->dev, "%s: DSM error %d result %u\n",
 				__func__, err, result);
 		return err;
 	}

 	if (!host->reset_gpio)
 		return -EOPNOTSUPP;

 	gpiod_set_value_cansleep(host->reset_gpio, 1);
 	usleep_range(10, 15);

 	gpiod_set_value_cansleep(host->reset_gpio, 0);
 	usleep_range(10, 15);

 	return 0;
 }

 static struct gpio_desc *ufs_intel_get_reset_gpio(struct device *dev)
 {
 	/* GPIO in _DSD has active low setting */
 	return devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
 }

 static int ufs_intel_common_init(struct ufs_hba *hba)
 {
 	struct intel_host *host;

 	hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;

 	host = devm_kzalloc(hba->dev, sizeof(*host), GFP_KERNEL);
 	if (!host)
 		return -ENOMEM;
 	ufshcd_set_variant(hba, host);
 	intel_dsm_init(host, hba->dev);
 	if (host->dsm_fns & INTEL_DSM_RESET) {
 		if (hba->vops->device_reset)
 			hba->caps |= UFSHCD_CAP_DEEPSLEEP;
 	} else {
 		if (hba->vops->device_reset)
 			host->reset_gpio = ufs_intel_get_reset_gpio(hba->dev);
 		if (IS_ERR(host->reset_gpio)) {
 			dev_err(hba->dev, "%s: failed to get reset GPIO, error %ld\n",
 				__func__, PTR_ERR(host->reset_gpio));
 			host->reset_gpio = NULL;
 		}
 		if (host->reset_gpio) {
 			gpiod_set_value_cansleep(host->reset_gpio, 0);
 			hba->caps |= UFSHCD_CAP_DEEPSLEEP;
 		}
 	}
 	intel_ltr_expose(hba->dev);
 	intel_add_debugfs(hba);
 	return 0;
 }

 static void ufs_intel_common_exit(struct ufs_hba *hba)
 {
 	intel_remove_debugfs(hba);
 	intel_ltr_hide(hba->dev);
 }

 static int ufs_intel_resume(struct ufs_hba *hba, enum ufs_pm_op op)
 {
 	if (ufshcd_is_link_hibern8(hba)) {
 		int ret = ufshcd_uic_hibern8_exit(hba);

 		if (!ret) {
 			ufshcd_set_link_active(hba);
 		} else {
 			dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
 				__func__, ret);
 			/*
 			 * Force reset and restore. Any other actions can lead
 			 * to an unrecoverable state.
 			 */
 			ufshcd_set_link_off(hba);
 		}
 	}

 	return 0;
 }

 static int ufs_intel_ehl_init(struct ufs_hba *hba)
 {
 	hba->quirks |= UFSHCD_QUIRK_BROKEN_AUTO_HIBERN8;
 	return ufs_intel_common_init(hba);
 }

 static void ufs_intel_lkf_late_init(struct ufs_hba *hba)
 {
 	/* LKF always needs a full reset, so set PM accordingly */
 	if (hba->caps & UFSHCD_CAP_DEEPSLEEP) {
 		hba->spm_lvl = UFS_PM_LVL_6;
 		hba->rpm_lvl = UFS_PM_LVL_6;
 	} else {
 		hba->spm_lvl = UFS_PM_LVL_5;
 		hba->rpm_lvl = UFS_PM_LVL_5;
 	}
 }

 static int ufs_intel_lkf_init(struct ufs_hba *hba)
 {
 	struct ufs_host *ufs_host;
 	int err;

 	hba->nop_out_timeout = 200;
 	hba->quirks |= UFSHCD_QUIRK_BROKEN_AUTO_HIBERN8;
 	hba->caps |= UFSHCD_CAP_CRYPTO;
 	err = ufs_intel_common_init(hba);
 	ufs_host = ufshcd_get_variant(hba);
 	ufs_host->late_init = ufs_intel_lkf_late_init;
 	return err;
 }

 static struct ufs_hba_variant_ops ufs_intel_cnl_hba_vops = {
 	.name                   = "intel-pci",
 	.init			= ufs_intel_common_init,
 	.exit			= ufs_intel_common_exit,
 	.link_startup_notify	= ufs_intel_link_startup_notify,
 	.resume			= ufs_intel_resume,
 };

 static struct ufs_hba_variant_ops ufs_intel_ehl_hba_vops = {
 	.name                   = "intel-pci",
 	.init			= ufs_intel_ehl_init,
 	.exit			= ufs_intel_common_exit,
 	.link_startup_notify	= ufs_intel_link_startup_notify,
 	.resume			= ufs_intel_resume,
 };

 static struct ufs_hba_variant_ops ufs_intel_lkf_hba_vops = {
 	.name                   = "intel-pci",
 	.init			= ufs_intel_lkf_init,
 	.exit			= ufs_intel_common_exit,
 	.hce_enable_notify	= ufs_intel_hce_enable_notify,
 	.link_startup_notify	= ufs_intel_link_startup_notify,
 	.pwr_change_notify	= ufs_intel_lkf_pwr_change_notify,
 	.apply_dev_quirks	= ufs_intel_lkf_apply_dev_quirks,
 	.resume			= ufs_intel_resume,
 	.device_reset		= ufs_intel_device_reset,
 };

 #ifdef CONFIG_PM_SLEEP
 static int ufshcd_pci_restore(struct device *dev)
 {
 	struct ufs_hba *hba = dev_get_drvdata(dev);

 	/* Force a full reset and restore */
 	ufshcd_set_link_off(hba);

 	return ufshcd_system_resume(dev);
 }
 #endif

 /**
  * ufshcd_pci_shutdown - main function to put the controller in reset state
  * @pdev: pointer to PCI device handle
  */
 static void ufshcd_pci_shutdown(struct pci_dev *pdev)
 {
 	ufshcd_shutdown((struct ufs_hba *)pci_get_drvdata(pdev));
 }

 /**
  * ufshcd_pci_remove - de-allocate PCI/SCSI host and host memory space
  *		data structure memory
  * @pdev: pointer to PCI handle
  */
 static void ufshcd_pci_remove(struct pci_dev *pdev)
 {
 	struct ufs_hba *hba = pci_get_drvdata(pdev);

 	pm_runtime_forbid(&pdev->dev);
 	pm_runtime_get_noresume(&pdev->dev);
 	ufshcd_remove(hba);
 	ufshcd_dealloc_host(hba);
 }

 /**
  * ufshcd_pci_probe - probe routine of the driver
  * @pdev: pointer to PCI device handle
  * @id: PCI device id
  *
  * Returns 0 on success, non-zero value on failure
  */
 static int
 ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct ufs_host *ufs_host;
 	struct ufs_hba *hba;
 	void __iomem *mmio_base;
 	int err;

 	err = pcim_enable_device(pdev);
 	if (err) {
 		dev_err(&pdev->dev, "pcim_enable_device failed\n");
 		return err;
 	}

 	pci_set_master(pdev);

 	err = pcim_iomap_regions(pdev, 1 << 0, UFSHCD);
 	if (err < 0) {
 		dev_err(&pdev->dev, "request and iomap failed\n");
 		return err;
 	}

 	mmio_base = pcim_iomap_table(pdev)[0];

 	err = ufshcd_alloc_host(&pdev->dev, &hba);
 	if (err) {
 		dev_err(&pdev->dev, "Allocation failed\n");
 		return err;
 	}

 	pci_set_drvdata(pdev, hba);

 	hba->vops = (struct ufs_hba_variant_ops *)id->driver_data;

 	err = ufshcd_init(hba, mmio_base, pdev->irq);
 	if (err) {
 		dev_err(&pdev->dev, "Initialization failed\n");
 		ufshcd_dealloc_host(hba);
 		return err;
 	}

 	ufs_host = ufshcd_get_variant(hba);
 	if (ufs_host && ufs_host->late_init)
 		ufs_host->late_init(hba);

 	pm_runtime_put_noidle(&pdev->dev);
 	pm_runtime_allow(&pdev->dev);

 	return 0;
 }

 static const struct dev_pm_ops ufshcd_pci_pm_ops = {
 	SET_RUNTIME_PM_OPS(ufshcd_runtime_suspend, ufshcd_runtime_resume, NULL)
 #ifdef CONFIG_PM_SLEEP
 	.suspend	= ufshcd_system_suspend,
 	.resume		= ufshcd_system_resume,
 	.freeze		= ufshcd_system_suspend,
 	.thaw		= ufshcd_system_resume,
 	.poweroff	= ufshcd_system_suspend,
 	.restore	= ufshcd_pci_restore,
 	.prepare	= ufshcd_suspend_prepare,
 	.complete	= ufshcd_resume_complete,
 #endif
 };

 static const struct pci_device_id ufshcd_pci_tbl[] = {
 	{ PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
 	{ PCI_VDEVICE(INTEL, 0x9DFA), (kernel_ulong_t)&ufs_intel_cnl_hba_vops },
 	{ PCI_VDEVICE(INTEL, 0x4B41), (kernel_ulong_t)&ufs_intel_ehl_hba_vops },
 	{ PCI_VDEVICE(INTEL, 0x4B43), (kernel_ulong_t)&ufs_intel_ehl_hba_vops },
 	{ PCI_VDEVICE(INTEL, 0x98FA), (kernel_ulong_t)&ufs_intel_lkf_hba_vops },
 	{ }	/* terminate list */
 };

 MODULE_DEVICE_TABLE(pci, ufshcd_pci_tbl);

 static struct pci_driver ufshcd_pci_driver = {
 	.name = UFSHCD,
 	.id_table = ufshcd_pci_tbl,
 	.probe = ufshcd_pci_probe,
 	.remove = ufshcd_pci_remove,
 	.shutdown = ufshcd_pci_shutdown,
 	.driver = {
 		.pm = &ufshcd_pci_pm_ops
 	},
 };

 module_pci_driver(ufshcd_pci_driver);

 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
 MODULE_DESCRIPTION("UFS host controller PCI glue driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(UFSHCD_DRIVER_VERSION);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Universal Flash Storage Host controller PCI glue driver
	*
	* This code is based on drivers/scsi/ufs/ufshcd-pci.c
	* Copyright (C) 2011-2013 Samsung India Software Operations
	*
	* Authors:
	* Santosh Yaraganavi <santosh.sy@samsung.com>
	* Vinayak Holikatti <h.vinayak@samsung.com>
	*/

	#include "ufshcd.h"
	#include <linux/pci.h>
	#include <linux/pm_runtime.h>
	#include <linux/pm_qos.h>
	#include <linux/debugfs.h>
	#include <linux/uuid.h>
	#include <linux/acpi.h>
	#include <linux/gpio/consumer.h>

	struct ufs_host {
	void (late_init)(struct ufs_hba hba);
	};

	enum {
	INTEL_DSM_FNS = 0,
	INTEL_DSM_RESET = 1,
	};

	struct intel_host {
	struct ufs_host ufs_host;
	u32 dsm_fns;
	u32 active_ltr;
	u32 idle_ltr;
	struct dentry *debugfs_root;
	struct gpio_desc *reset_gpio;
	};

	static const guid_t intel_dsm_guid =
	GUID_INIT(0x1A4832A0, 0x7D03, 0x43CA,
	0xB0, 0x20, 0xF6, 0xDC, 0xD1, 0x2A, 0x19, 0x50);

	static int __intel_dsm(struct intel_host intel_host, struct device dev,
	unsigned int fn, u32 *result)
	{
	union acpi_object *obj;
	int err = 0;
	size_t len;

	obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &intel_dsm_guid, 0, fn, NULL);
	if (!obj)
	return -EOPNOTSUPP;

	if (obj->type != ACPI_TYPE_BUFFER \|\| obj->buffer.length < 1) {
	err = -EINVAL;
	goto out;
	}

	len = min_t(size_t, obj->buffer.length, 4);

	*result = 0;
	memcpy(result, obj->buffer.pointer, len);
	out:
	ACPI_FREE(obj);

	return err;
	}

	static int intel_dsm(struct intel_host intel_host, struct device dev,
	unsigned int fn, u32 *result)
	{
	if (fn > 31 \|\| !(intel_host->dsm_fns & (1 << fn)))
	return -EOPNOTSUPP;

	return __intel_dsm(intel_host, dev, fn, result);
	}

	static void intel_dsm_init(struct intel_host intel_host, struct device dev)
	{
	int err;

	err = __intel_dsm(intel_host, dev, INTEL_DSM_FNS, &intel_host->dsm_fns);
	dev_dbg(dev, "DSM fns %#x, error %d\n", intel_host->dsm_fns, err);
	}

	static int ufs_intel_hce_enable_notify(struct ufs_hba *hba,
	enum ufs_notify_change_status status)
	{
	/* Cannot enable ICE until after HC enable */
	if (status == POST_CHANGE && hba->caps & UFSHCD_CAP_CRYPTO) {
	u32 hce = ufshcd_readl(hba, REG_CONTROLLER_ENABLE);

	hce \|= CRYPTO_GENERAL_ENABLE;
	ufshcd_writel(hba, hce, REG_CONTROLLER_ENABLE);
	}

	return 0;
	}

	static int ufs_intel_disable_lcc(struct ufs_hba *hba)
	{
	u32 attr = UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE);
	u32 lcc_enable = 0;

	ufshcd_dme_get(hba, attr, &lcc_enable);
	if (lcc_enable)
	ufshcd_disable_host_tx_lcc(hba);

	return 0;
	}

	static int ufs_intel_link_startup_notify(struct ufs_hba *hba,
	enum ufs_notify_change_status status)
	{
	int err = 0;

	switch (status) {
	case PRE_CHANGE:
	err = ufs_intel_disable_lcc(hba);
	break;
	case POST_CHANGE:
	break;
	default:
	break;
	}

	return err;
	}

	static int ufs_intel_set_lanes(struct ufs_hba *hba, u32 lanes)
	{
	struct ufs_pa_layer_attr pwr_info = hba->pwr_info;
	int ret;

	pwr_info.lane_rx = lanes;
	pwr_info.lane_tx = lanes;
	ret = ufshcd_config_pwr_mode(hba, &pwr_info);
	if (ret)
	dev_err(hba->dev, "%s: Setting %u lanes, err = %d\n",
	__func__, lanes, ret);
	return ret;
	}

	static int ufs_intel_lkf_pwr_change_notify(struct ufs_hba *hba,
	enum ufs_notify_change_status status,
	struct ufs_pa_layer_attr *dev_max_params,
	struct ufs_pa_layer_attr *dev_req_params)
	{
	int err = 0;

	switch (status) {
	case PRE_CHANGE:
	if (ufshcd_is_hs_mode(dev_max_params) &&
	(hba->pwr_info.lane_rx != 2 \|\| hba->pwr_info.lane_tx != 2))
	ufs_intel_set_lanes(hba, 2);
	memcpy(dev_req_params, dev_max_params, sizeof(*dev_req_params));
	break;
	case POST_CHANGE:
	if (ufshcd_is_hs_mode(dev_req_params)) {
	u32 peer_granularity;

	usleep_range(1000, 1250);
	err = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_GRANULARITY),
	&peer_granularity);
	}
	break;
	default:
	break;
	}

	return err;
	}

	static int ufs_intel_lkf_apply_dev_quirks(struct ufs_hba *hba)
	{
	u32 granularity, peer_granularity;
	u32 pa_tactivate, peer_pa_tactivate;
	int ret;

	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_GRANULARITY), &granularity);
	if (ret)
	goto out;

	ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_GRANULARITY), &peer_granularity);
	if (ret)
	goto out;

	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_TACTIVATE), &pa_tactivate);
	if (ret)
	goto out;

	ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_TACTIVATE), &peer_pa_tactivate);
	if (ret)
	goto out;

	if (granularity == peer_granularity) {
	u32 new_peer_pa_tactivate = pa_tactivate + 2;

	ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(PA_TACTIVATE), new_peer_pa_tactivate);
	}
	out:
	return ret;
	}

	#define INTEL_ACTIVELTR 0x804
	#define INTEL_IDLELTR 0x808

	#define INTEL_LTR_REQ BIT(15)
	#define INTEL_LTR_SCALE_MASK GENMASK(11, 10)
	#define INTEL_LTR_SCALE_1US (2 << 10)
	#define INTEL_LTR_SCALE_32US (3 << 10)
	#define INTEL_LTR_VALUE_MASK GENMASK(9, 0)

	static void intel_cache_ltr(struct ufs_hba *hba)
	{
	struct intel_host *host = ufshcd_get_variant(hba);

	host->active_ltr = readl(hba->mmio_base + INTEL_ACTIVELTR);
	host->idle_ltr = readl(hba->mmio_base + INTEL_IDLELTR);
	}

	static void intel_ltr_set(struct device *dev, s32 val)
	{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	struct intel_host *host = ufshcd_get_variant(hba);
	u32 ltr;

	pm_runtime_get_sync(dev);

	/*
	* Program latency tolerance (LTR) accordingly what has been asked
	* by the PM QoS layer or disable it in case we were passed
	* negative value or PM_QOS_LATENCY_ANY.
	*/
	ltr = readl(hba->mmio_base + INTEL_ACTIVELTR);

	if (val == PM_QOS_LATENCY_ANY \|\| val < 0) {
	ltr &= ~INTEL_LTR_REQ;
	} else {
	ltr \|= INTEL_LTR_REQ;
	ltr &= ~INTEL_LTR_SCALE_MASK;
	ltr &= ~INTEL_LTR_VALUE_MASK;

	if (val > INTEL_LTR_VALUE_MASK) {
	val >>= 5;
	if (val > INTEL_LTR_VALUE_MASK)
	val = INTEL_LTR_VALUE_MASK;
	ltr \|= INTEL_LTR_SCALE_32US \| val;
	} else {
	ltr \|= INTEL_LTR_SCALE_1US \| val;
	}
	}

	if (ltr == host->active_ltr)
	goto out;

	writel(ltr, hba->mmio_base + INTEL_ACTIVELTR);
	writel(ltr, hba->mmio_base + INTEL_IDLELTR);

	/* Cache the values into intel_host structure */
	intel_cache_ltr(hba);
	out:
	pm_runtime_put(dev);
	}

	static void intel_ltr_expose(struct device *dev)
	{
	dev->power.set_latency_tolerance = intel_ltr_set;
	dev_pm_qos_expose_latency_tolerance(dev);
	}

	static void intel_ltr_hide(struct device *dev)
	{
	dev_pm_qos_hide_latency_tolerance(dev);
	dev->power.set_latency_tolerance = NULL;
	}

	static void intel_add_debugfs(struct ufs_hba *hba)
	{
	struct dentry *dir = debugfs_create_dir(dev_name(hba->dev), NULL);
	struct intel_host *host = ufshcd_get_variant(hba);

	intel_cache_ltr(hba);

	host->debugfs_root = dir;
	debugfs_create_x32("active_ltr", 0444, dir, &host->active_ltr);
	debugfs_create_x32("idle_ltr", 0444, dir, &host->idle_ltr);
	}

	static void intel_remove_debugfs(struct ufs_hba *hba)
	{
	struct intel_host *host = ufshcd_get_variant(hba);

	debugfs_remove_recursive(host->debugfs_root);
	}

	static int ufs_intel_device_reset(struct ufs_hba *hba)
	{
	struct intel_host *host = ufshcd_get_variant(hba);

	if (host->dsm_fns & INTEL_DSM_RESET) {
	u32 result = 0;
	int err;

	err = intel_dsm(host, hba->dev, INTEL_DSM_RESET, &result);
	if (!err && !result)
	err = -EIO;
	if (err)
	dev_err(hba->dev, "%s: DSM error %d result %u\n",
	__func__, err, result);
	return err;
	}

	if (!host->reset_gpio)
	return -EOPNOTSUPP;

	gpiod_set_value_cansleep(host->reset_gpio, 1);
	usleep_range(10, 15);

	gpiod_set_value_cansleep(host->reset_gpio, 0);
	usleep_range(10, 15);

	return 0;
	}

	static struct gpio_desc ufs_intel_get_reset_gpio(struct device dev)
	{
	/* GPIO in _DSD has active low setting */
	return devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
	}

	static int ufs_intel_common_init(struct ufs_hba *hba)
	{
	struct intel_host *host;

	hba->caps \|= UFSHCD_CAP_RPM_AUTOSUSPEND;

	host = devm_kzalloc(hba->dev, sizeof(*host), GFP_KERNEL);
	if (!host)
	return -ENOMEM;
	ufshcd_set_variant(hba, host);
	intel_dsm_init(host, hba->dev);
	if (host->dsm_fns & INTEL_DSM_RESET) {
	if (hba->vops->device_reset)
	hba->caps \|= UFSHCD_CAP_DEEPSLEEP;
	} else {
	if (hba->vops->device_reset)
	host->reset_gpio = ufs_intel_get_reset_gpio(hba->dev);
	if (IS_ERR(host->reset_gpio)) {
	dev_err(hba->dev, "%s: failed to get reset GPIO, error %ld\n",
	__func__, PTR_ERR(host->reset_gpio));
	host->reset_gpio = NULL;
	}
	if (host->reset_gpio) {
	gpiod_set_value_cansleep(host->reset_gpio, 0);
	hba->caps \|= UFSHCD_CAP_DEEPSLEEP;
	}
	}
	intel_ltr_expose(hba->dev);
	intel_add_debugfs(hba);
	return 0;
	}

	static void ufs_intel_common_exit(struct ufs_hba *hba)
	{
	intel_remove_debugfs(hba);
	intel_ltr_hide(hba->dev);
	}

	static int ufs_intel_resume(struct ufs_hba *hba, enum ufs_pm_op op)
	{
	if (ufshcd_is_link_hibern8(hba)) {
	int ret = ufshcd_uic_hibern8_exit(hba);

	if (!ret) {
	ufshcd_set_link_active(hba);
	} else {
	dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
	__func__, ret);
	/*
	* Force reset and restore. Any other actions can lead
	* to an unrecoverable state.
	*/
	ufshcd_set_link_off(hba);
	}
	}

	return 0;
	}

	static int ufs_intel_ehl_init(struct ufs_hba *hba)
	{
	hba->quirks \|= UFSHCD_QUIRK_BROKEN_AUTO_HIBERN8;
	return ufs_intel_common_init(hba);
	}

	static void ufs_intel_lkf_late_init(struct ufs_hba *hba)
	{
	/* LKF always needs a full reset, so set PM accordingly */
	if (hba->caps & UFSHCD_CAP_DEEPSLEEP) {
	hba->spm_lvl = UFS_PM_LVL_6;
	hba->rpm_lvl = UFS_PM_LVL_6;
	} else {
	hba->spm_lvl = UFS_PM_LVL_5;
	hba->rpm_lvl = UFS_PM_LVL_5;
	}
	}

	static int ufs_intel_lkf_init(struct ufs_hba *hba)
	{
	struct ufs_host *ufs_host;
	int err;

	hba->nop_out_timeout = 200;
	hba->quirks \|= UFSHCD_QUIRK_BROKEN_AUTO_HIBERN8;
	hba->caps \|= UFSHCD_CAP_CRYPTO;
	err = ufs_intel_common_init(hba);
	ufs_host = ufshcd_get_variant(hba);
	ufs_host->late_init = ufs_intel_lkf_late_init;
	return err;
	}

	static struct ufs_hba_variant_ops ufs_intel_cnl_hba_vops = {
	.name = "intel-pci",
	.init = ufs_intel_common_init,
	.exit = ufs_intel_common_exit,
	.link_startup_notify = ufs_intel_link_startup_notify,
	.resume = ufs_intel_resume,
	};

	static struct ufs_hba_variant_ops ufs_intel_ehl_hba_vops = {
	.name = "intel-pci",
	.init = ufs_intel_ehl_init,
	.exit = ufs_intel_common_exit,
	.link_startup_notify = ufs_intel_link_startup_notify,
	.resume = ufs_intel_resume,
	};

	static struct ufs_hba_variant_ops ufs_intel_lkf_hba_vops = {
	.name = "intel-pci",
	.init = ufs_intel_lkf_init,
	.exit = ufs_intel_common_exit,
	.hce_enable_notify = ufs_intel_hce_enable_notify,
	.link_startup_notify = ufs_intel_link_startup_notify,
	.pwr_change_notify = ufs_intel_lkf_pwr_change_notify,
	.apply_dev_quirks = ufs_intel_lkf_apply_dev_quirks,
	.resume = ufs_intel_resume,
	.device_reset = ufs_intel_device_reset,
	};

	#ifdef CONFIG_PM_SLEEP
	static int ufshcd_pci_restore(struct device *dev)
	{
	struct ufs_hba *hba = dev_get_drvdata(dev);

	/* Force a full reset and restore */
	ufshcd_set_link_off(hba);

	return ufshcd_system_resume(dev);
	}
	#endif

	/**
	* ufshcd_pci_shutdown - main function to put the controller in reset state
	* @pdev: pointer to PCI device handle
	*/
	static void ufshcd_pci_shutdown(struct pci_dev *pdev)
	{
	ufshcd_shutdown((struct ufs_hba *)pci_get_drvdata(pdev));
	}

	/**
	* ufshcd_pci_remove - de-allocate PCI/SCSI host and host memory space
	* data structure memory
	* @pdev: pointer to PCI handle
	*/
	static void ufshcd_pci_remove(struct pci_dev *pdev)
	{
	struct ufs_hba *hba = pci_get_drvdata(pdev);

	pm_runtime_forbid(&pdev->dev);
	pm_runtime_get_noresume(&pdev->dev);
	ufshcd_remove(hba);
	ufshcd_dealloc_host(hba);
	}

	/**
	* ufshcd_pci_probe - probe routine of the driver
	* @pdev: pointer to PCI device handle
	* @id: PCI device id
	*
	* Returns 0 on success, non-zero value on failure
	*/
	static int
	ufshcd_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
	{
	struct ufs_host *ufs_host;
	struct ufs_hba *hba;
	void __iomem *mmio_base;
	int err;

	err = pcim_enable_device(pdev);
	if (err) {
	dev_err(&pdev->dev, "pcim_enable_device failed\n");
	return err;
	}

	pci_set_master(pdev);

	err = pcim_iomap_regions(pdev, 1 << 0, UFSHCD);
	if (err < 0) {
	dev_err(&pdev->dev, "request and iomap failed\n");
	return err;
	}

	mmio_base = pcim_iomap_table(pdev)[0];

	err = ufshcd_alloc_host(&pdev->dev, &hba);
	if (err) {
	dev_err(&pdev->dev, "Allocation failed\n");
	return err;
	}

	pci_set_drvdata(pdev, hba);

	hba->vops = (struct ufs_hba_variant_ops *)id->driver_data;

	err = ufshcd_init(hba, mmio_base, pdev->irq);
	if (err) {
	dev_err(&pdev->dev, "Initialization failed\n");
	ufshcd_dealloc_host(hba);
	return err;
	}

	ufs_host = ufshcd_get_variant(hba);
	if (ufs_host && ufs_host->late_init)
	ufs_host->late_init(hba);

	pm_runtime_put_noidle(&pdev->dev);
	pm_runtime_allow(&pdev->dev);

	return 0;
	}

	static const struct dev_pm_ops ufshcd_pci_pm_ops = {
	SET_RUNTIME_PM_OPS(ufshcd_runtime_suspend, ufshcd_runtime_resume, NULL)
	#ifdef CONFIG_PM_SLEEP
	.suspend = ufshcd_system_suspend,
	.resume = ufshcd_system_resume,
	.freeze = ufshcd_system_suspend,
	.thaw = ufshcd_system_resume,
	.poweroff = ufshcd_system_suspend,
	.restore = ufshcd_pci_restore,
	.prepare = ufshcd_suspend_prepare,
	.complete = ufshcd_resume_complete,
	#endif
	};

	static const struct pci_device_id ufshcd_pci_tbl[] = {
	{ PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ PCI_VDEVICE(INTEL, 0x9DFA), (kernel_ulong_t)&ufs_intel_cnl_hba_vops },
	{ PCI_VDEVICE(INTEL, 0x4B41), (kernel_ulong_t)&ufs_intel_ehl_hba_vops },
	{ PCI_VDEVICE(INTEL, 0x4B43), (kernel_ulong_t)&ufs_intel_ehl_hba_vops },
	{ PCI_VDEVICE(INTEL, 0x98FA), (kernel_ulong_t)&ufs_intel_lkf_hba_vops },
	{ } /* terminate list */
	};

	MODULE_DEVICE_TABLE(pci, ufshcd_pci_tbl);

	static struct pci_driver ufshcd_pci_driver = {
	.name = UFSHCD,
	.id_table = ufshcd_pci_tbl,
	.probe = ufshcd_pci_probe,
	.remove = ufshcd_pci_remove,
	.shutdown = ufshcd_pci_shutdown,
	.driver = {
	.pm = &ufshcd_pci_pm_ops
	},
	};

	module_pci_driver(ufshcd_pci_driver);

	MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
	MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
	MODULE_DESCRIPTION("UFS host controller PCI glue driver");
	MODULE_LICENSE("GPL");
	MODULE_VERSION(UFSHCD_DRIVER_VERSION);