[linux.git] / drivers / reset / reset-meson-audio-arb.c

// SPDX-License-Identifier: (GPL-2.0 OR MIT)
// Copyright (c) 2018 BayLibre, SAS.
// Author: Jerome Brunet <[email protected]>

#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/reset-controller.h>
#include <linux/spinlock.h>

#include <dt-bindings/reset/amlogic,meson-axg-audio-arb.h>

struct meson_audio_arb_data {
	struct reset_controller_dev rstc;
	void __iomem *regs;
	struct clk *clk;
	const unsigned int *reset_bits;
	spinlock_t lock;
};

struct meson_audio_arb_match_data {
	const unsigned int *reset_bits;
	unsigned int reset_num;
};

#define ARB_GENERAL_BIT	31

static const unsigned int axg_audio_arb_reset_bits[] = {
	[AXG_ARB_TODDR_A]	= 0,
	[AXG_ARB_TODDR_B]	= 1,
	[AXG_ARB_TODDR_C]	= 2,
	[AXG_ARB_FRDDR_A]	= 4,
	[AXG_ARB_FRDDR_B]	= 5,
	[AXG_ARB_FRDDR_C]	= 6,
};

static const struct meson_audio_arb_match_data axg_audio_arb_match = {
	.reset_bits = axg_audio_arb_reset_bits,
	.reset_num = ARRAY_SIZE(axg_audio_arb_reset_bits),
};

static const unsigned int sm1_audio_arb_reset_bits[] = {
	[AXG_ARB_TODDR_A]	= 0,
	[AXG_ARB_TODDR_B]	= 1,
	[AXG_ARB_TODDR_C]	= 2,
	[AXG_ARB_FRDDR_A]	= 4,
	[AXG_ARB_FRDDR_B]	= 5,
	[AXG_ARB_FRDDR_C]	= 6,
	[AXG_ARB_TODDR_D]	= 3,
	[AXG_ARB_FRDDR_D]	= 7,
};

static const struct meson_audio_arb_match_data sm1_audio_arb_match = {
	.reset_bits = sm1_audio_arb_reset_bits,
	.reset_num = ARRAY_SIZE(sm1_audio_arb_reset_bits),
};

static int meson_audio_arb_update(struct reset_controller_dev *rcdev,
				  unsigned long id, bool assert)
{
	u32 val;
	struct meson_audio_arb_data *arb =
		container_of(rcdev, struct meson_audio_arb_data, rstc);

	spin_lock(&arb->lock);
	val = readl(arb->regs);

	if (assert)
		val &= ~BIT(arb->reset_bits[id]);
	else
		val |= BIT(arb->reset_bits[id]);

	writel(val, arb->regs);
	spin_unlock(&arb->lock);

	return 0;
}

static int meson_audio_arb_status(struct reset_controller_dev *rcdev,
				  unsigned long id)
{
	u32 val;
	struct meson_audio_arb_data *arb =
		container_of(rcdev, struct meson_audio_arb_data, rstc);

	val = readl(arb->regs);

	return !(val & BIT(arb->reset_bits[id]));
}

static int meson_audio_arb_assert(struct reset_controller_dev *rcdev,
				  unsigned long id)
{
	return meson_audio_arb_update(rcdev, id, true);
}

static int meson_audio_arb_deassert(struct reset_controller_dev *rcdev,
				    unsigned long id)
{
	return meson_audio_arb_update(rcdev, id, false);
}

static const struct reset_control_ops meson_audio_arb_rstc_ops = {
	.assert = meson_audio_arb_assert,
	.deassert = meson_audio_arb_deassert,
	.status = meson_audio_arb_status,
};

static const struct of_device_id meson_audio_arb_of_match[] = {
	{
		.compatible = "amlogic,meson-axg-audio-arb",
		.data = &axg_audio_arb_match,
	}, {
		.compatible = "amlogic,meson-sm1-audio-arb",
		.data = &sm1_audio_arb_match,
	},
	{}
};
MODULE_DEVICE_TABLE(of, meson_audio_arb_of_match);

static int meson_audio_arb_remove(struct platform_device *pdev)
{
	struct meson_audio_arb_data *arb = platform_get_drvdata(pdev);

	/* Disable all access */
	spin_lock(&arb->lock);
	writel(0, arb->regs);
	spin_unlock(&arb->lock);

	clk_disable_unprepare(arb->clk);

	return 0;
}

static int meson_audio_arb_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct meson_audio_arb_match_data *data;
	struct meson_audio_arb_data *arb;
	struct resource *res;
	int ret;

	data = of_device_get_match_data(dev);
	if (!data)
		return -EINVAL;

	arb = devm_kzalloc(dev, sizeof(*arb), GFP_KERNEL);
	if (!arb)
		return -ENOMEM;
	platform_set_drvdata(pdev, arb);

	arb->clk = devm_clk_get(dev, NULL);
	if (IS_ERR(arb->clk))
		return dev_err_probe(dev, PTR_ERR(arb->clk), "failed to get clock\n");

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	arb->regs = devm_ioremap_resource(dev, res);
	if (IS_ERR(arb->regs))
		return PTR_ERR(arb->regs);

	spin_lock_init(&arb->lock);
	arb->reset_bits = data->reset_bits;
	arb->rstc.nr_resets = data->reset_num;
	arb->rstc.ops = &meson_audio_arb_rstc_ops;
	arb->rstc.of_node = dev->of_node;
	arb->rstc.owner = THIS_MODULE;

	/*
	 * Enable general :
	 * In the initial state, all memory interfaces are disabled
	 * and the general bit is on
	 */
	ret = clk_prepare_enable(arb->clk);
	if (ret) {
		dev_err(dev, "failed to enable arb clock\n");
		return ret;
	}
	writel(BIT(ARB_GENERAL_BIT), arb->regs);

	/* Register reset controller */
	ret = devm_reset_controller_register(dev, &arb->rstc);
	if (ret) {
		dev_err(dev, "failed to register arb reset controller\n");
		meson_audio_arb_remove(pdev);
	}

	return ret;
}

static struct platform_driver meson_audio_arb_pdrv = {
	.probe = meson_audio_arb_probe,
	.remove = meson_audio_arb_remove,
	.driver = {
		.name = "meson-audio-arb-reset",
		.of_match_table = meson_audio_arb_of_match,
	},
};
module_platform_driver(meson_audio_arb_pdrv);

MODULE_DESCRIPTION("Amlogic A113 Audio Memory Arbiter");
MODULE_AUTHOR("Jerome Brunet <[email protected]>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d903779b JB	1	// SPDX-License-Identifier: (GPL-2.0 OR MIT)
	2	// Copyright (c) 2018 BayLibre, SAS.
	3	// Author: Jerome Brunet <[email protected]>
	4
	5	#include <linux/clk.h>
	6	#include <linux/io.h>
	7	#include <linux/module.h>
	8	#include <linux/of_platform.h>
	9	#include <linux/reset-controller.h>
	10	#include <linux/spinlock.h>
	11
	12	#include <dt-bindings/reset/amlogic,meson-axg-audio-arb.h>
	13
	14	struct meson_audio_arb_data {
	15	struct reset_controller_dev rstc;
	16	void __iomem *regs;
	17	struct clk *clk;
	18	const unsigned int *reset_bits;
	19	spinlock_t lock;
	20	};
	21
9c41152c JB	22	struct meson_audio_arb_match_data {
	23	const unsigned int *reset_bits;
	24	unsigned int reset_num;
	25	};
	26
d903779b JB	27	#define ARB_GENERAL_BIT 31
	28
	29	static const unsigned int axg_audio_arb_reset_bits[] = {
	30	[AXG_ARB_TODDR_A] = 0,
	31	[AXG_ARB_TODDR_B] = 1,
	32	[AXG_ARB_TODDR_C] = 2,
	33	[AXG_ARB_FRDDR_A] = 4,
	34	[AXG_ARB_FRDDR_B] = 5,
	35	[AXG_ARB_FRDDR_C] = 6,
	36	};
	37
9c41152c JB	38	static const struct meson_audio_arb_match_data axg_audio_arb_match = {
	39	.reset_bits = axg_audio_arb_reset_bits,
	40	.reset_num = ARRAY_SIZE(axg_audio_arb_reset_bits),
	41	};
	42
	43	static const unsigned int sm1_audio_arb_reset_bits[] = {
	44	[AXG_ARB_TODDR_A] = 0,
	45	[AXG_ARB_TODDR_B] = 1,
	46	[AXG_ARB_TODDR_C] = 2,
	47	[AXG_ARB_FRDDR_A] = 4,
	48	[AXG_ARB_FRDDR_B] = 5,
	49	[AXG_ARB_FRDDR_C] = 6,
	50	[AXG_ARB_TODDR_D] = 3,
	51	[AXG_ARB_FRDDR_D] = 7,
	52	};
	53
	54	static const struct meson_audio_arb_match_data sm1_audio_arb_match = {
	55	.reset_bits = sm1_audio_arb_reset_bits,
	56	.reset_num = ARRAY_SIZE(sm1_audio_arb_reset_bits),
	57	};
	58
d903779b JB	59	static int meson_audio_arb_update(struct reset_controller_dev *rcdev,
	60	unsigned long id, bool assert)
	61	{
	62	u32 val;
	63	struct meson_audio_arb_data *arb =
	64	container_of(rcdev, struct meson_audio_arb_data, rstc);
	65
	66	spin_lock(&arb->lock);
	67	val = readl(arb->regs);
	68
	69	if (assert)
	70	val &= ~BIT(arb->reset_bits[id]);
	71	else
	72	val \|= BIT(arb->reset_bits[id]);
	73
	74	writel(val, arb->regs);
	75	spin_unlock(&arb->lock);
	76
	77	return 0;
	78	}
	79
	80	static int meson_audio_arb_status(struct reset_controller_dev *rcdev,
	81	unsigned long id)
	82	{
	83	u32 val;
	84	struct meson_audio_arb_data *arb =
	85	container_of(rcdev, struct meson_audio_arb_data, rstc);
	86
	87	val = readl(arb->regs);
	88
	89	return !(val & BIT(arb->reset_bits[id]));
	90	}
	91
	92	static int meson_audio_arb_assert(struct reset_controller_dev *rcdev,
	93	unsigned long id)
	94	{
	95	return meson_audio_arb_update(rcdev, id, true);
	96	}
	97
	98	static int meson_audio_arb_deassert(struct reset_controller_dev *rcdev,
	99	unsigned long id)
	100	{
	101	return meson_audio_arb_update(rcdev, id, false);
	102	}
	103
	104	static const struct reset_control_ops meson_audio_arb_rstc_ops = {
	105	.assert = meson_audio_arb_assert,
	106	.deassert = meson_audio_arb_deassert,
	107	.status = meson_audio_arb_status,
	108	};
	109
	110	static const struct of_device_id meson_audio_arb_of_match[] = {
9c41152c JB	111	{
	112	.compatible = "amlogic,meson-axg-audio-arb",
	113	.data = &axg_audio_arb_match,
	114	}, {
	115	.compatible = "amlogic,meson-sm1-audio-arb",
	116	.data = &sm1_audio_arb_match,
	117	},
d903779b JB	118	{}
	119	};
	120	MODULE_DEVICE_TABLE(of, meson_audio_arb_of_match);
	121
	122	static int meson_audio_arb_remove(struct platform_device *pdev)
	123	{
	124	struct meson_audio_arb_data *arb = platform_get_drvdata(pdev);
	125
	126	/* Disable all access */
	127	spin_lock(&arb->lock);
	128	writel(0, arb->regs);
	129	spin_unlock(&arb->lock);
	130
	131	clk_disable_unprepare(arb->clk);
	132
	133	return 0;
	134	}
	135
	136	static int meson_audio_arb_probe(struct platform_device *pdev)
	137	{
	138	struct device *dev = &pdev->dev;
9c41152c	139	const struct meson_audio_arb_match_data *data;
d903779b JB	140	struct meson_audio_arb_data *arb;
	141	struct resource *res;
	142	int ret;
	143
9c41152c JB	144	data = of_device_get_match_data(dev);
	145	if (!data)
	146	return -EINVAL;
	147
d903779b JB	148	arb = devm_kzalloc(dev, sizeof(*arb), GFP_KERNEL);
	149	if (!arb)
	150	return -ENOMEM;
	151	platform_set_drvdata(pdev, arb);
	152
	153	arb->clk = devm_clk_get(dev, NULL);
da46de51 YX	154	if (IS_ERR(arb->clk))
da46de51 YX	155	return dev_err_probe(dev, PTR_ERR(arb->clk), "failed to get clock\n");
d903779b JB	156
	157	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	158	arb->regs = devm_ioremap_resource(dev, res);
	159	if (IS_ERR(arb->regs))
	160	return PTR_ERR(arb->regs);
	161
	162	spin_lock_init(&arb->lock);
9c41152c JB	163	arb->reset_bits = data->reset_bits;
9c41152c JB	164	arb->rstc.nr_resets = data->reset_num;
d903779b JB	165	arb->rstc.ops = &meson_audio_arb_rstc_ops;
d903779b JB	166	arb->rstc.of_node = dev->of_node;
13e8a05b	167	arb->rstc.owner = THIS_MODULE;
d903779b JB	168
	169	/*
	170	* Enable general :
	171	* In the initial state, all memory interfaces are disabled
	172	* and the general bit is on
	173	*/
	174	ret = clk_prepare_enable(arb->clk);
	175	if (ret) {
	176	dev_err(dev, "failed to enable arb clock\n");
	177	return ret;
	178	}
	179	writel(BIT(ARB_GENERAL_BIT), arb->regs);
	180
	181	/* Register reset controller */
	182	ret = devm_reset_controller_register(dev, &arb->rstc);
	183	if (ret) {
	184	dev_err(dev, "failed to register arb reset controller\n");
	185	meson_audio_arb_remove(pdev);
	186	}
	187
	188	return ret;
	189	}
	190
	191	static struct platform_driver meson_audio_arb_pdrv = {
	192	.probe = meson_audio_arb_probe,
	193	.remove = meson_audio_arb_remove,
	194	.driver = {
	195	.name = "meson-audio-arb-reset",
	196	.of_match_table = meson_audio_arb_of_match,
	197	},
	198	};
	199	module_platform_driver(meson_audio_arb_pdrv);
	200
	201	MODULE_DESCRIPTION("Amlogic A113 Audio Memory Arbiter");
	202	MODULE_AUTHOR("Jerome Brunet <[email protected]>");
	203	MODULE_LICENSE("GPL v2");