[linux-block.git] / drivers / memory / pl353-smc.c

// SPDX-License-Identifier: GPL-2.0
/*
 * ARM PL353 SMC driver
 *
 * Copyright (C) 2012 - 2018 Xilinx, Inc
 * Author: Punnaiah Choudary Kalluri <punnaiah@xilinx.com>
 * Author: Naga Sureshkumar Relli <nagasure@xilinx.com>
 */

#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/amba/bus.h>

/**
 * struct pl353_smc_data - Private smc driver structure
 * @memclk:		Pointer to the peripheral clock
 * @aclk:		Pointer to the AXI peripheral clock
 */
struct pl353_smc_data {
	struct clk		*memclk;
	struct clk		*aclk;
};

static int __maybe_unused pl353_smc_suspend(struct device *dev)
{
	struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);

	clk_disable(pl353_smc->memclk);
	clk_disable(pl353_smc->aclk);

	return 0;
}

static int __maybe_unused pl353_smc_resume(struct device *dev)
{
	struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
	int ret;

	ret = clk_enable(pl353_smc->aclk);
	if (ret) {
		dev_err(dev, "Cannot enable axi domain clock.\n");
		return ret;
	}

	ret = clk_enable(pl353_smc->memclk);
	if (ret) {
		dev_err(dev, "Cannot enable memory clock.\n");
		clk_disable(pl353_smc->aclk);
		return ret;
	}

	return ret;
}

static SIMPLE_DEV_PM_OPS(pl353_smc_dev_pm_ops, pl353_smc_suspend,
			 pl353_smc_resume);

static const struct of_device_id pl353_smc_supported_children[] = {
	{
		.compatible = "cfi-flash"
	},
	{
		.compatible = "arm,pl353-nand-r2p1",
	},
	{}
};

static int pl353_smc_probe(struct amba_device *adev, const struct amba_id *id)
{
	struct device_node *of_node = adev->dev.of_node;
	const struct of_device_id *match = NULL;
	struct pl353_smc_data *pl353_smc;
	struct device_node *child;
	int err;

	pl353_smc = devm_kzalloc(&adev->dev, sizeof(*pl353_smc), GFP_KERNEL);
	if (!pl353_smc)
		return -ENOMEM;

	pl353_smc->aclk = devm_clk_get(&adev->dev, "apb_pclk");
	if (IS_ERR(pl353_smc->aclk)) {
		dev_err(&adev->dev, "aclk clock not found.\n");
		return PTR_ERR(pl353_smc->aclk);
	}

	pl353_smc->memclk = devm_clk_get(&adev->dev, "memclk");
	if (IS_ERR(pl353_smc->memclk)) {
		dev_err(&adev->dev, "memclk clock not found.\n");
		return PTR_ERR(pl353_smc->memclk);
	}

	err = clk_prepare_enable(pl353_smc->aclk);
	if (err) {
		dev_err(&adev->dev, "Unable to enable AXI clock.\n");
		return err;
	}

	err = clk_prepare_enable(pl353_smc->memclk);
	if (err) {
		dev_err(&adev->dev, "Unable to enable memory clock.\n");
		goto disable_axi_clk;
	}

	amba_set_drvdata(adev, pl353_smc);

	/* Find compatible children. Only a single child is supported */
	for_each_available_child_of_node(of_node, child) {
		match = of_match_node(pl353_smc_supported_children, child);
		if (!match) {
			dev_warn(&adev->dev, "unsupported child node\n");
			continue;
		}
		break;
	}
	if (!match) {
		err = -ENODEV;
		dev_err(&adev->dev, "no matching children\n");
		goto disable_mem_clk;
	}

	of_platform_device_create(child, NULL, &adev->dev);
	of_node_put(child);

	return 0;

disable_mem_clk:
	clk_disable_unprepare(pl353_smc->memclk);
disable_axi_clk:
	clk_disable_unprepare(pl353_smc->aclk);

	return err;
}

static void pl353_smc_remove(struct amba_device *adev)
{
	struct pl353_smc_data *pl353_smc = amba_get_drvdata(adev);

	clk_disable_unprepare(pl353_smc->memclk);
	clk_disable_unprepare(pl353_smc->aclk);
}

static const struct amba_id pl353_ids[] = {
	{
		.id = 0x00041353,
		.mask = 0x000fffff,
	},
	{ 0, 0 },
};
MODULE_DEVICE_TABLE(amba, pl353_ids);

static struct amba_driver pl353_smc_driver = {
	.drv = {
		.owner = THIS_MODULE,
		.name = "pl353-smc",
		.pm = &pl353_smc_dev_pm_ops,
	},
	.id_table = pl353_ids,
	.probe = pl353_smc_probe,
	.remove = pl353_smc_remove,
};

module_amba_driver(pl353_smc_driver);

MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("ARM PL353 SMC Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
fee10bd2 NSR	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* ARM PL353 SMC driver
	4	*
	5	* Copyright (C) 2012 - 2018 Xilinx, Inc
	6	* Author: Punnaiah Choudary Kalluri <punnaiah@xilinx.com>
	7	* Author: Naga Sureshkumar Relli <nagasure@xilinx.com>
	8	*/
	9
	10	#include <linux/clk.h>
fee10bd2 NSR	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/of_platform.h>
	14	#include <linux/platform_device.h>
fee10bd2 NSR	15	#include <linux/amba/bus.h>
fee10bd2 NSR	16
fee10bd2 NSR	17	/**
	18	* struct pl353_smc_data - Private smc driver structure
	19	* @memclk: Pointer to the peripheral clock
9d7bb449	20	* @aclk: Pointer to the AXI peripheral clock
fee10bd2 NSR	21	*/
	22	struct pl353_smc_data {
	23	struct clk *memclk;
	24	struct clk *aclk;
	25	};
	26
fee10bd2 NSR	27	static int __maybe_unused pl353_smc_suspend(struct device *dev)
	28	{
	29	struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
	30
	31	clk_disable(pl353_smc->memclk);
	32	clk_disable(pl353_smc->aclk);
	33
	34	return 0;
	35	}
	36
	37	static int __maybe_unused pl353_smc_resume(struct device *dev)
	38	{
fee10bd2	39	struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
df6c2646	40	int ret;
fee10bd2 NSR	41
	42	ret = clk_enable(pl353_smc->aclk);
	43	if (ret) {
	44	dev_err(dev, "Cannot enable axi domain clock.\n");
	45	return ret;
	46	}
	47
	48	ret = clk_enable(pl353_smc->memclk);
	49	if (ret) {
	50	dev_err(dev, "Cannot enable memory clock.\n");
	51	clk_disable(pl353_smc->aclk);
	52	return ret;
	53	}
	54
	55	return ret;
	56	}
	57
fee10bd2 NSR	58	static SIMPLE_DEV_PM_OPS(pl353_smc_dev_pm_ops, pl353_smc_suspend,
	59	pl353_smc_resume);
	60
fee10bd2 NSR	61	static const struct of_device_id pl353_smc_supported_children[] = {
	62	{
	63	.compatible = "cfi-flash"
	64	},
	65	{
	66	.compatible = "arm,pl353-nand-r2p1",
fee10bd2 NSR	67	},
	68	{}
	69	};
	70
	71	static int pl353_smc_probe(struct amba_device adev, const struct amba_id id)
	72	{
df6c2646 MR	73	struct device_node *of_node = adev->dev.of_node;
df6c2646 MR	74	const struct of_device_id *match = NULL;
fee10bd2 NSR	75	struct pl353_smc_data *pl353_smc;
fee10bd2 NSR	76	struct device_node *child;
fee10bd2	77	int err;
fee10bd2 NSR	78
	79	pl353_smc = devm_kzalloc(&adev->dev, sizeof(*pl353_smc), GFP_KERNEL);
	80	if (!pl353_smc)
	81	return -ENOMEM;
	82
fee10bd2 NSR	83	pl353_smc->aclk = devm_clk_get(&adev->dev, "apb_pclk");
	84	if (IS_ERR(pl353_smc->aclk)) {
	85	dev_err(&adev->dev, "aclk clock not found.\n");
	86	return PTR_ERR(pl353_smc->aclk);
	87	}
	88
	89	pl353_smc->memclk = devm_clk_get(&adev->dev, "memclk");
	90	if (IS_ERR(pl353_smc->memclk)) {
	91	dev_err(&adev->dev, "memclk clock not found.\n");
	92	return PTR_ERR(pl353_smc->memclk);
	93	}
	94
	95	err = clk_prepare_enable(pl353_smc->aclk);
	96	if (err) {
	97	dev_err(&adev->dev, "Unable to enable AXI clock.\n");
	98	return err;
	99	}
	100
	101	err = clk_prepare_enable(pl353_smc->memclk);
	102	if (err) {
	103	dev_err(&adev->dev, "Unable to enable memory clock.\n");
edd84c42	104	goto disable_axi_clk;
fee10bd2 NSR	105	}
	106
	107	amba_set_drvdata(adev, pl353_smc);
	108
fee10bd2 NSR	109	/* Find compatible children. Only a single child is supported */
	110	for_each_available_child_of_node(of_node, child) {
	111	match = of_match_node(pl353_smc_supported_children, child);
	112	if (!match) {
	113	dev_warn(&adev->dev, "unsupported child node\n");
	114	continue;
	115	}
	116	break;
	117	}
	118	if (!match) {
76e5624f	119	err = -ENODEV;
fee10bd2	120	dev_err(&adev->dev, "no matching children\n");
edd84c42	121	goto disable_mem_clk;
fee10bd2 NSR	122	}
fee10bd2 NSR	123
fee10bd2	124	of_platform_device_create(child, NULL, &adev->dev);
61b3c876	125	of_node_put(child);
fee10bd2 NSR	126
	127	return 0;
	128
edd84c42	129	disable_mem_clk:
fee10bd2	130	clk_disable_unprepare(pl353_smc->memclk);
edd84c42	131	disable_axi_clk:
fee10bd2 NSR	132	clk_disable_unprepare(pl353_smc->aclk);
	133
	134	return err;
	135	}
	136
3fd269e7	137	static void pl353_smc_remove(struct amba_device *adev)
fee10bd2 NSR	138	{
	139	struct pl353_smc_data *pl353_smc = amba_get_drvdata(adev);
	140
	141	clk_disable_unprepare(pl353_smc->memclk);
	142	clk_disable_unprepare(pl353_smc->aclk);
fee10bd2 NSR	143	}
	144
	145	static const struct amba_id pl353_ids[] = {
	146	{
62584c87 MR	147	.id = 0x00041353,
62584c87 MR	148	.mask = 0x000fffff,
fee10bd2 NSR	149	},
	150	{ 0, 0 },
	151	};
	152	MODULE_DEVICE_TABLE(amba, pl353_ids);
	153
	154	static struct amba_driver pl353_smc_driver = {
	155	.drv = {
	156	.owner = THIS_MODULE,
	157	.name = "pl353-smc",
	158	.pm = &pl353_smc_dev_pm_ops,
	159	},
	160	.id_table = pl353_ids,
	161	.probe = pl353_smc_probe,
	162	.remove = pl353_smc_remove,
	163	};
	164
	165	module_amba_driver(pl353_smc_driver);
	166
	167	MODULE_AUTHOR("Xilinx, Inc.");
	168	MODULE_DESCRIPTION("ARM PL353 SMC Driver");
	169	MODULE_LICENSE("GPL");