// SPDX-License-Identifier: GPL-2.0-only
/*
 * UNISOC UFS Host Controller driver
 *
 * Copyright (C) 2022 Unisoc, Inc.
 * Author: Zhe Wang <zhe.wang1@unisoc.com>
 */

#include <linux/arm-smccc.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/regulator/consumer.h>

#include <ufs/ufshcd.h>
#include "ufshcd-pltfrm.h"
#include "ufs-sprd.h"

static const struct of_device_id ufs_sprd_of_match[];

static struct ufs_sprd_priv *ufs_sprd_get_priv_data(struct ufs_hba *hba)
{
	struct ufs_sprd_host *host = ufshcd_get_variant(hba);

	WARN_ON(!host->priv);
	return host->priv;
}

static void ufs_sprd_regmap_update(struct ufs_sprd_priv *priv, unsigned int index,
				unsigned int reg, unsigned int bits,  unsigned int val)
{
	regmap_update_bits(priv->sysci[index].regmap, reg, bits, val);
}

static void ufs_sprd_regmap_read(struct ufs_sprd_priv *priv, unsigned int index,
				unsigned int reg, unsigned int *val)
{
	regmap_read(priv->sysci[index].regmap, reg, val);
}

static void ufs_sprd_get_unipro_ver(struct ufs_hba *hba)
{
	struct ufs_sprd_host *host = ufshcd_get_variant(hba);

	if (ufshcd_dme_get(hba, UIC_ARG_MIB(PA_LOCALVERINFO), &host->unipro_ver))
		host->unipro_ver = 0;
}

static void ufs_sprd_ctrl_uic_compl(struct ufs_hba *hba, bool enable)
{
	u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);

	if (enable == true)
		set |= UIC_COMMAND_COMPL;
	else
		set &= ~UIC_COMMAND_COMPL;
	ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
}

static int ufs_sprd_get_reset_ctrl(struct device *dev, struct ufs_sprd_rst *rci)
{
	rci->rc = devm_reset_control_get(dev, rci->name);
	if (IS_ERR(rci->rc)) {
		dev_err(dev, "failed to get reset ctrl:%s\n", rci->name);
		return PTR_ERR(rci->rc);
	}

	return 0;
}

static int ufs_sprd_get_syscon_reg(struct device *dev, struct ufs_sprd_syscon *sysci)
{
	sysci->regmap = syscon_regmap_lookup_by_phandle(dev->of_node, sysci->name);
	if (IS_ERR(sysci->regmap)) {
		dev_err(dev, "failed to get ufs syscon:%s\n", sysci->name);
		return PTR_ERR(sysci->regmap);
	}

	return 0;
}

static int ufs_sprd_get_vreg(struct device *dev, struct ufs_sprd_vreg *vregi)
{
	vregi->vreg = devm_regulator_get(dev, vregi->name);
	if (IS_ERR(vregi->vreg)) {
		dev_err(dev, "failed to get vreg:%s\n", vregi->name);
		return PTR_ERR(vregi->vreg);
	}

	return 0;
}

static int ufs_sprd_parse_dt(struct device *dev, struct ufs_hba *hba, struct ufs_sprd_host *host)
{
	u32 i;
	struct ufs_sprd_priv *priv = host->priv;
	int ret = 0;

	/* Parse UFS reset ctrl info */
	for (i = 0; i < SPRD_UFS_RST_MAX; i++) {
		if (!priv->rci[i].name)
			continue;
		ret = ufs_sprd_get_reset_ctrl(dev, &priv->rci[i]);
		if (ret)
			goto out;
	}

	/* Parse UFS syscon reg info */
	for (i = 0; i < SPRD_UFS_SYSCON_MAX; i++) {
		if (!priv->sysci[i].name)
			continue;
		ret = ufs_sprd_get_syscon_reg(dev, &priv->sysci[i]);
		if (ret)
			goto out;
	}

	/* Parse UFS vreg info */
	for (i = 0; i < SPRD_UFS_VREG_MAX; i++) {
		if (!priv->vregi[i].name)
			continue;
		ret = ufs_sprd_get_vreg(dev, &priv->vregi[i]);
		if (ret)
			goto out;
	}

out:
	return ret;
}

static int ufs_sprd_common_init(struct ufs_hba *hba)
{
	struct device *dev = hba->dev;
	struct ufs_sprd_host *host;
	struct platform_device __maybe_unused *pdev = to_platform_device(dev);
	const struct of_device_id *of_id;
	int ret = 0;

	host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
	if (!host)
		return -ENOMEM;

	of_id = of_match_node(ufs_sprd_of_match, pdev->dev.of_node);
	if (of_id->data != NULL)
		host->priv = container_of(of_id->data, struct ufs_sprd_priv,
					  ufs_hba_sprd_vops);

	host->hba = hba;
	ufshcd_set_variant(hba, host);

	hba->caps |= UFSHCD_CAP_CLK_GATING |
		UFSHCD_CAP_CRYPTO |
		UFSHCD_CAP_WB_EN;
	hba->quirks |= UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS;

	ret = ufs_sprd_parse_dt(dev, hba, host);

	return ret;
}

static int sprd_ufs_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)
{
	struct ufs_sprd_host *host = ufshcd_get_variant(hba);

	if (status == PRE_CHANGE) {
		memcpy(dev_req_params, dev_max_params,
			sizeof(struct ufs_pa_layer_attr));
		if (host->unipro_ver >= UFS_UNIPRO_VER_1_8)
			ufshcd_dme_configure_adapt(hba, dev_req_params->gear_tx,
						   PA_INITIAL_ADAPT);
	}

	return 0;
}

static int ufs_sprd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op,
			    enum ufs_notify_change_status status)
{
	unsigned long flags;

	if (status == PRE_CHANGE) {
		if (ufshcd_is_auto_hibern8_supported(hba)) {
			spin_lock_irqsave(hba->host->host_lock, flags);
			ufshcd_writel(hba, 0, REG_AUTO_HIBERNATE_IDLE_TIMER);
			spin_unlock_irqrestore(hba->host->host_lock, flags);
		}
	}

	return 0;
}

static void ufs_sprd_n6_host_reset(struct ufs_hba *hba)
{
	struct ufs_sprd_priv *priv = ufs_sprd_get_priv_data(hba);

	dev_info(hba->dev, "ufs host reset!\n");

	reset_control_assert(priv->rci[SPRD_UFSHCI_SOFT_RST].rc);
	usleep_range(1000, 1100);
	reset_control_deassert(priv->rci[SPRD_UFSHCI_SOFT_RST].rc);
}

static int ufs_sprd_n6_device_reset(struct ufs_hba *hba)
{
	struct ufs_sprd_priv *priv = ufs_sprd_get_priv_data(hba);

	dev_info(hba->dev, "ufs device reset!\n");

	reset_control_assert(priv->rci[SPRD_UFS_DEV_RST].rc);
	usleep_range(1000, 1100);
	reset_control_deassert(priv->rci[SPRD_UFS_DEV_RST].rc);

	return 0;
}

static void ufs_sprd_n6_key_acc_enable(struct ufs_hba *hba)
{
	u32 val;
	u32 retry = 10;
	struct arm_smccc_res res;

check_hce:
	/* Key access only can be enabled under HCE enable */
	val = ufshcd_readl(hba, REG_CONTROLLER_ENABLE);
	if (!(val & CONTROLLER_ENABLE)) {
		ufs_sprd_n6_host_reset(hba);
		val |= CONTROLLER_ENABLE;
		ufshcd_writel(hba, val, REG_CONTROLLER_ENABLE);
		usleep_range(1000, 1100);
		if (retry) {
			retry--;
			goto check_hce;
		}
		goto disable_crypto;
	}

	arm_smccc_smc(SPRD_SIP_SVC_STORAGE_UFS_CRYPTO_ENABLE,
		      0, 0, 0, 0, 0, 0, 0, &res);
	if (!res.a0)
		return;

disable_crypto:
	dev_err(hba->dev, "key reg access enable fail, disable crypto\n");
	hba->caps &= ~UFSHCD_CAP_CRYPTO;
}

static int ufs_sprd_n6_init(struct ufs_hba *hba)
{
	struct ufs_sprd_priv *priv;
	int ret = 0;

	ret = ufs_sprd_common_init(hba);
	if (ret != 0)
		return ret;

	priv = ufs_sprd_get_priv_data(hba);

	ret = regulator_enable(priv->vregi[SPRD_UFS_VDD_MPHY].vreg);
	if (ret)
		return -ENODEV;

	if (hba->caps & UFSHCD_CAP_CRYPTO)
		ufs_sprd_n6_key_acc_enable(hba);

	return 0;
}

static int ufs_sprd_n6_phy_init(struct ufs_hba *hba)
{
	int ret = 0;
	uint32_t val = 0;
	uint32_t retry = 10;
	uint32_t offset;
	struct ufs_sprd_priv *priv = ufs_sprd_get_priv_data(hba);

	ufshcd_dme_set(hba, UIC_ARG_MIB(CBREFCLKCTRL2), 0x90);
	ufshcd_dme_set(hba, UIC_ARG_MIB(CBCRCTRL), 0x01);
	ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(RXSQCONTROL,
				UIC_ARG_MPHY_RX_GEN_SEL_INDEX(0)), 0x01);
	ufshcd_dme_set(hba, UIC_ARG_MIB_SEL(RXSQCONTROL,
				UIC_ARG_MPHY_RX_GEN_SEL_INDEX(1)), 0x01);
	ufshcd_dme_set(hba, UIC_ARG_MIB(VS_MPHYCFGUPDT), 0x01);
	ufshcd_dme_set(hba, UIC_ARG_MIB(CBRATESEL), 0x01);

	do {
		/* phy_sram_init_done */
		ufs_sprd_regmap_read(priv, SPRD_UFS_ANLG, 0xc, &val);
		if ((val & 0x1) == 0x1) {
			for (offset = 0x40; offset < 0x42; offset++) {
				/* Lane afe calibration */
				ufshcd_dme_set(hba, UIC_ARG_MIB(CBCREGADDRLSB), 0x1c);
				ufshcd_dme_set(hba, UIC_ARG_MIB(CBCREGADDRMSB), offset);
				ufshcd_dme_set(hba, UIC_ARG_MIB(CBCREGWRLSB), 0x04);
				ufshcd_dme_set(hba, UIC_ARG_MIB(CBCREGWRMSB), 0x00);
				ufshcd_dme_set(hba, UIC_ARG_MIB(CBCREGRDWRSEL), 0x01);
				ufshcd_dme_set(hba, UIC_ARG_MIB(VS_MPHYCFGUPDT), 0x01);
			}

			goto update_phy;
		}
		udelay(1000);
		retry--;
	} while (retry > 0);

	ret = -ETIMEDOUT;
	goto out;

update_phy:
	/* phy_sram_ext_ld_done */
	ufs_sprd_regmap_update(priv, SPRD_UFS_ANLG, 0xc, 0x2, 0);
	ufshcd_dme_set(hba, UIC_ARG_MIB(VS_MPHYCFGUPDT), 0x01);
	ufshcd_dme_set(hba, UIC_ARG_MIB(VS_MPHYDISABLE), 0x0);
out:
	return ret;
}


static int sprd_ufs_n6_hce_enable_notify(struct ufs_hba *hba,
					 enum ufs_notify_change_status status)
{
	int err = 0;
	struct ufs_sprd_priv *priv = ufs_sprd_get_priv_data(hba);

	if (status == PRE_CHANGE) {
		/* phy_sram_ext_ld_done */
		ufs_sprd_regmap_update(priv, SPRD_UFS_ANLG, 0xc, 0x2, 0x2);
		/* phy_sram_bypass */
		ufs_sprd_regmap_update(priv, SPRD_UFS_ANLG, 0xc, 0x4, 0x4);

		ufs_sprd_n6_host_reset(hba);

		if (hba->caps & UFSHCD_CAP_CRYPTO)
			ufs_sprd_n6_key_acc_enable(hba);
	}

	if (status == POST_CHANGE) {
		err = ufs_sprd_n6_phy_init(hba);
		if (err) {
			dev_err(hba->dev, "Phy setup failed (%d)\n", err);
			goto out;
		}

		ufs_sprd_get_unipro_ver(hba);
	}
out:
	return err;
}

static void sprd_ufs_n6_h8_notify(struct ufs_hba *hba,
				  enum uic_cmd_dme cmd,
				  enum ufs_notify_change_status status)
{
	struct ufs_sprd_priv *priv = ufs_sprd_get_priv_data(hba);

	if (status == PRE_CHANGE) {
		if (cmd == UIC_CMD_DME_HIBER_ENTER)
			/*
			 * Disable UIC COMPL INTR to prevent access to UFSHCI after
			 * checking HCS.UPMCRS
			 */
			ufs_sprd_ctrl_uic_compl(hba, false);

		if (cmd == UIC_CMD_DME_HIBER_EXIT) {
			ufs_sprd_regmap_update(priv, SPRD_UFS_AON_APB, APB_UFSDEV_REG,
				APB_UFSDEV_REFCLK_EN, APB_UFSDEV_REFCLK_EN);
			ufs_sprd_regmap_update(priv, SPRD_UFS_AON_APB, APB_USB31PLL_CTRL,
				APB_USB31PLLV_REF2MPHY, APB_USB31PLLV_REF2MPHY);
		}
	}

	if (status == POST_CHANGE) {
		if (cmd == UIC_CMD_DME_HIBER_EXIT)
			ufs_sprd_ctrl_uic_compl(hba, true);

		if (cmd == UIC_CMD_DME_HIBER_ENTER) {
			ufs_sprd_regmap_update(priv, SPRD_UFS_AON_APB, APB_UFSDEV_REG,
				APB_UFSDEV_REFCLK_EN, 0);
			ufs_sprd_regmap_update(priv, SPRD_UFS_AON_APB, APB_USB31PLL_CTRL,
				APB_USB31PLLV_REF2MPHY, 0);
		}
	}
}

static struct ufs_sprd_priv n6_ufs = {
	.rci[SPRD_UFSHCI_SOFT_RST] = { .name = "controller", },
	.rci[SPRD_UFS_DEV_RST] = { .name = "device", },

	.sysci[SPRD_UFS_ANLG] = { .name = "sprd,ufs-anlg-syscon", },
	.sysci[SPRD_UFS_AON_APB] = { .name = "sprd,aon-apb-syscon", },

	.vregi[SPRD_UFS_VDD_MPHY] = { .name = "vdd-mphy", },

	.ufs_hba_sprd_vops = {
		.name = "sprd,ums9620-ufs",
		.init = ufs_sprd_n6_init,
		.hce_enable_notify = sprd_ufs_n6_hce_enable_notify,
		.pwr_change_notify = sprd_ufs_pwr_change_notify,
		.hibern8_notify = sprd_ufs_n6_h8_notify,
		.device_reset = ufs_sprd_n6_device_reset,
		.suspend = ufs_sprd_suspend,
	},
};

static const struct of_device_id __maybe_unused ufs_sprd_of_match[] = {
	{ .compatible = "sprd,ums9620-ufs", .data = &n6_ufs.ufs_hba_sprd_vops},
	{},
};
MODULE_DEVICE_TABLE(of, ufs_sprd_of_match);

static int ufs_sprd_probe(struct platform_device *pdev)
{
	int err;
	struct device *dev = &pdev->dev;
	const struct of_device_id *of_id;

	of_id = of_match_node(ufs_sprd_of_match, dev->of_node);
	err = ufshcd_pltfrm_init(pdev, of_id->data);
	if (err)
		dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err);

	return err;
}

static void ufs_sprd_remove(struct platform_device *pdev)
{
	ufshcd_pltfrm_remove(pdev);
}

static const struct dev_pm_ops ufs_sprd_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(ufshcd_system_suspend, ufshcd_system_resume)
	SET_RUNTIME_PM_OPS(ufshcd_runtime_suspend, ufshcd_runtime_resume, NULL)
	.prepare	 = ufshcd_suspend_prepare,
	.complete	 = ufshcd_resume_complete,
};

static struct platform_driver ufs_sprd_pltform = {
	.probe = ufs_sprd_probe,
	.remove = ufs_sprd_remove,
	.driver = {
		.name = "ufshcd-sprd",
		.pm = &ufs_sprd_pm_ops,
		.of_match_table = of_match_ptr(ufs_sprd_of_match),
	},
};
module_platform_driver(ufs_sprd_pltform);

MODULE_AUTHOR("Zhe Wang <zhe.wang1@unisoc.com>");
MODULE_DESCRIPTION("Unisoc UFS Host Driver");
MODULE_LICENSE("GPL v2");