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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2019 Texas Instruments Incorporated - https://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/of_address.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_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
struct am654_hbmc_priv *priv;
struct resource res;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
ret = of_address_to_resource(np, 0, &res);
if (ret)
return ret;
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->hbdev.map.size = resource_size(&res);
priv->hbdev.map.virt = devm_ioremap_resource(dev, &res);
if (IS_ERR(priv->hbdev.map.virt))
return PTR_ERR(priv->hbdev.map.virt);
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>");
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