mtd: hyperbus: Add driver for TI's HyperBus memory controller

	  the HyperBus Controller driver to communicate with

	  HyperFlash. See Cypress HyperBus specification for more

	  details

if MTD_HYPERBUS

config HBMC_AM654

	tristate "HyperBus controller driver for AM65x SoC"

	select MULTIPLEXER

	select MUX_MMIO

	help

	 This is the driver for HyperBus controller on TI's AM65x and

	 other SoCs

endif # MTD_HYPERBUS

# SPDX-License-Identifier: GPL-2.0

obj-$(CONFIG_MTD_HYPERBUS)	+= hyperbus-core.o

obj-$(CONFIG_HBMC_AM654)	+= hbmc-am654.o

// SPDX-License-Identifier: GPL-2.0

//

// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/

// Author: Vignesh Raghavendra <vigneshr@ti.com>

#include <linux/err.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mtd/cfi.h>

#include <linux/mtd/hyperbus.h>

#include <linux/mtd/mtd.h>

#include <linux/mux/consumer.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/types.h>

#define AM654_HBMC_CALIB_COUNT 25

struct am654_hbmc_priv {

	struct hyperbus_ctlr ctlr;

	struct hyperbus_device hbdev;

	struct mux_control *mux_ctrl;

};

static int am654_hbmc_calibrate(struct hyperbus_device *hbdev)

{

	struct map_info *map = &hbdev->map;

	struct cfi_private cfi;

	int count = AM654_HBMC_CALIB_COUNT;

	int pass_count = 0;

	int ret;

	cfi.interleave = 1;

	cfi.device_type = CFI_DEVICETYPE_X16;

	cfi_send_gen_cmd(0xF0, 0, 0, map, &cfi, cfi.device_type, NULL);

	cfi_send_gen_cmd(0x98, 0x55, 0, map, &cfi, cfi.device_type, NULL);

	while (count--) {

		ret = cfi_qry_present(map, 0, &cfi);

		if (ret)

			pass_count++;

		else

			pass_count = 0;

		if (pass_count == 5)

			break;

	}

	cfi_qry_mode_off(0, map, &cfi);

	return ret;

}

static const struct hyperbus_ops am654_hbmc_ops = {

	.calibrate = am654_hbmc_calibrate,

};

static int am654_hbmc_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct am654_hbmc_priv *priv;

	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);

	if (!priv)

		return -ENOMEM;

	platform_set_drvdata(pdev, priv);

	if (of_property_read_bool(dev->of_node, "mux-controls")) {

		struct mux_control *control = devm_mux_control_get(dev, NULL);

		if (IS_ERR(control))

			return PTR_ERR(control);

		ret = mux_control_select(control, 1);

		if (ret) {

			dev_err(dev, "Failed to select HBMC mux\n");

			return ret;

		}

		priv->mux_ctrl = control;

	}

	pm_runtime_enable(dev);

	ret = pm_runtime_get_sync(dev);

	if (ret < 0) {

		pm_runtime_put_noidle(dev);

		goto disable_pm;

	}

	priv->ctlr.dev = dev;

	priv->ctlr.ops = &am654_hbmc_ops;

	priv->hbdev.ctlr = &priv->ctlr;

	priv->hbdev.np = of_get_next_child(dev->of_node, NULL);

	ret = hyperbus_register_device(&priv->hbdev);

	if (ret) {

		dev_err(dev, "failed to register controller\n");

		pm_runtime_put_sync(&pdev->dev);

		goto disable_pm;

	}

	return 0;

disable_pm:

	pm_runtime_disable(dev);

	if (priv->mux_ctrl)

		mux_control_deselect(priv->mux_ctrl);

	return ret;

}

static int am654_hbmc_remove(struct platform_device *pdev)

{

	struct am654_hbmc_priv *priv = platform_get_drvdata(pdev);

	int ret;

	ret = hyperbus_unregister_device(&priv->hbdev);

	if (priv->mux_ctrl)

		mux_control_deselect(priv->mux_ctrl);

	pm_runtime_put_sync(&pdev->dev);

	pm_runtime_disable(&pdev->dev);

	return ret;

}

static const struct of_device_id am654_hbmc_dt_ids[] = {

	{

		.compatible = "ti,am654-hbmc",

	},

	{ /* end of table */ }

};

MODULE_DEVICE_TABLE(of, am654_hbmc_dt_ids);

static struct platform_driver am654_hbmc_platform_driver = {

	.probe = am654_hbmc_probe,

	.remove = am654_hbmc_remove,

	.driver = {

		.name = "hbmc-am654",

		.of_match_table = am654_hbmc_dt_ids,

	},

};

module_platform_driver(am654_hbmc_platform_driver);

MODULE_DESCRIPTION("HBMC driver for AM654 SoC");

MODULE_LICENSE("GPL v2");

MODULE_ALIAS("platform:hbmc-am654");

MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");