148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
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// Author: Vignesh Raghavendra <vigneshr@ti.com>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mtd/cfi.h>
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#include <linux/mtd/hyperbus.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mux/consumer.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/types.h>
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#define AM654_HBMC_CALIB_COUNT 25
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struct am654_hbmc_priv {
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struct hyperbus_ctlr ctlr;
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struct hyperbus_device hbdev;
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struct mux_control *mux_ctrl;
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};
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static int am654_hbmc_calibrate(struct hyperbus_device *hbdev)
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{
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struct map_info *map = &hbdev->map;
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struct cfi_private cfi;
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int count = AM654_HBMC_CALIB_COUNT;
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int pass_count = 0;
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int ret;
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cfi.interleave = 1;
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cfi.device_type = CFI_DEVICETYPE_X16;
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cfi_send_gen_cmd(0xF0, 0, 0, map, &cfi, cfi.device_type, NULL);
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cfi_send_gen_cmd(0x98, 0x55, 0, map, &cfi, cfi.device_type, NULL);
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while (count--) {
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ret = cfi_qry_present(map, 0, &cfi);
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if (ret)
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pass_count++;
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else
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pass_count = 0;
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if (pass_count == 5)
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break;
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}
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cfi_qry_mode_off(0, map, &cfi);
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return ret;
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}
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static const struct hyperbus_ops am654_hbmc_ops = {
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.calibrate = am654_hbmc_calibrate,
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};
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static int am654_hbmc_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct am654_hbmc_priv *priv;
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int ret;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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platform_set_drvdata(pdev, priv);
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if (of_property_read_bool(dev->of_node, "mux-controls")) {
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struct mux_control *control = devm_mux_control_get(dev, NULL);
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if (IS_ERR(control))
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return PTR_ERR(control);
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ret = mux_control_select(control, 1);
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if (ret) {
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dev_err(dev, "Failed to select HBMC mux\n");
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return ret;
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}
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priv->mux_ctrl = control;
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}
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pm_runtime_enable(dev);
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ret = pm_runtime_get_sync(dev);
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if (ret < 0) {
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pm_runtime_put_noidle(dev);
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goto disable_pm;
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}
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priv->ctlr.dev = dev;
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priv->ctlr.ops = &am654_hbmc_ops;
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priv->hbdev.ctlr = &priv->ctlr;
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priv->hbdev.np = of_get_next_child(dev->of_node, NULL);
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ret = hyperbus_register_device(&priv->hbdev);
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if (ret) {
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dev_err(dev, "failed to register controller\n");
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pm_runtime_put_sync(&pdev->dev);
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goto disable_pm;
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}
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return 0;
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disable_pm:
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pm_runtime_disable(dev);
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if (priv->mux_ctrl)
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mux_control_deselect(priv->mux_ctrl);
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return ret;
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}
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static int am654_hbmc_remove(struct platform_device *pdev)
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{
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struct am654_hbmc_priv *priv = platform_get_drvdata(pdev);
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int ret;
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ret = hyperbus_unregister_device(&priv->hbdev);
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if (priv->mux_ctrl)
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mux_control_deselect(priv->mux_ctrl);
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pm_runtime_put_sync(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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return ret;
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}
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static const struct of_device_id am654_hbmc_dt_ids[] = {
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{
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.compatible = "ti,am654-hbmc",
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},
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{ /* end of table */ }
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};
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MODULE_DEVICE_TABLE(of, am654_hbmc_dt_ids);
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static struct platform_driver am654_hbmc_platform_driver = {
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.probe = am654_hbmc_probe,
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.remove = am654_hbmc_remove,
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.driver = {
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.name = "hbmc-am654",
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.of_match_table = am654_hbmc_dt_ids,
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},
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};
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module_platform_driver(am654_hbmc_platform_driver);
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MODULE_DESCRIPTION("HBMC driver for AM654 SoC");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:hbmc-am654");
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MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");
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