drivers/clk/mmp/clk-audio.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * MMP Audio Clock Controller driver
  *
  * Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk>
  */

 #include <linux/clk-provider.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm_clock.h>
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 #include <dt-bindings/clock/marvell,mmp2-audio.h>

 /* Audio Controller Registers */
 #define SSPA_AUD_CTRL				0x04
 #define SSPA_AUD_PLL_CTRL0			0x08
 #define SSPA_AUD_PLL_CTRL1			0x0c

 /* SSPA Audio Control Register */
 #define SSPA_AUD_CTRL_SYSCLK_SHIFT		0
 #define SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT		1
 #define SSPA_AUD_CTRL_SSPA0_MUX_SHIFT		7
 #define SSPA_AUD_CTRL_SSPA0_SHIFT		8
 #define SSPA_AUD_CTRL_SSPA0_DIV_SHIFT		9
 #define SSPA_AUD_CTRL_SSPA1_SHIFT		16
 #define SSPA_AUD_CTRL_SSPA1_DIV_SHIFT		17
 #define SSPA_AUD_CTRL_SSPA1_MUX_SHIFT		23
 #define SSPA_AUD_CTRL_DIV_MASK			0x7e

 /* SSPA Audio PLL Control 0 Register */
 #define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK (0x7 << 28)
 #define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(x)	((x) << 28)
 #define SSPA_AUD_PLL_CTRL0_FRACT_MASK		(0xfffff << 8)
 #define SSPA_AUD_PLL_CTRL0_FRACT(x)		((x) << 8)
 #define SSPA_AUD_PLL_CTRL0_ENA_DITHER		(1 << 7)
 #define SSPA_AUD_PLL_CTRL0_ICP_2UA		(0 << 5)
 #define SSPA_AUD_PLL_CTRL0_ICP_5UA		(1 << 5)
 #define SSPA_AUD_PLL_CTRL0_ICP_7UA		(2 << 5)
 #define SSPA_AUD_PLL_CTRL0_ICP_10UA		(3 << 5)
 #define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK	(0x3 << 3)
 #define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(x)	((x) << 3)
 #define SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK	(0x1 << 2)
 #define SSPA_AUD_PLL_CTRL0_DIV_MCLK(x)		((x) << 2)
 #define SSPA_AUD_PLL_CTRL0_PD_OVPROT_DIS	(1 << 1)
 #define SSPA_AUD_PLL_CTRL0_PU			(1 << 0)

 /* SSPA Audio PLL Control 1 Register */
 #define SSPA_AUD_PLL_CTRL1_SEL_FAST_CLK		(1 << 24)
 #define SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK		(1 << 11)
 #define SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL	(1 << 11)
 #define SSPA_AUD_PLL_CTRL1_CLK_SEL_VCXO		(0 << 11)
 #define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK (0x7ff << 0)
 #define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(x)	((x) << 0)

 struct mmp2_audio_clk {
 	void __iomem *mmio_base;

 	struct clk_hw audio_pll_hw;
 	struct clk_mux sspa_mux;
 	struct clk_mux sspa1_mux;
 	struct clk_divider sysclk_div;
 	struct clk_divider sspa0_div;
 	struct clk_divider sspa1_div;
 	struct clk_gate sysclk_gate;
 	struct clk_gate sspa0_gate;
 	struct clk_gate sspa1_gate;

 	u32 aud_ctrl;
 	u32 aud_pll_ctrl0;
 	u32 aud_pll_ctrl1;

 	spinlock_t lock;

 	/* Must be last */
 	struct clk_hw_onecell_data clk_data;
 };

 static const struct {
 	unsigned long parent_rate;
 	unsigned long freq_vco;
 	unsigned char mclk;
 	unsigned char fbcclk;
 	unsigned short fract;
 } predivs[] = {
 	{ 26000000, 135475200, 0, 0, 0x8a18 },
 	{ 26000000, 147456000, 0, 1, 0x0da1 },
 	{ 38400000, 135475200, 1, 2, 0x8208 },
 	{ 38400000, 147456000, 1, 3, 0xaaaa },
 };

 static const struct {
 	unsigned char divisor;
 	unsigned char modulo;
 	unsigned char pattern;
 } postdivs[] = {
 	{   1,	3,  0, },
 	{   2,	5,  0, },
 	{   4,	0,  0, },
 	{   6,	1,  1, },
 	{   8,	1,  0, },
 	{   9,	1,  2, },
 	{  12,	2,  1, },
 	{  16,	2,  0, },
 	{  18,	2,  2, },
 	{  24,	4,  1, },
 	{  36,	4,  2, },
 	{  48,	6,  1, },
 	{  72,	6,  2, },
 };

 static unsigned long audio_pll_recalc_rate(struct clk_hw *hw,
 					   unsigned long parent_rate)
 {
 	struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
 	unsigned int prediv;
 	unsigned int postdiv;
 	u32 aud_pll_ctrl0;
 	u32 aud_pll_ctrl1;

 	aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
 	aud_pll_ctrl0 &= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK |
 			 SSPA_AUD_PLL_CTRL0_FRACT_MASK |
 			 SSPA_AUD_PLL_CTRL0_ENA_DITHER |
 			 SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK |
 			 SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK |
 			 SSPA_AUD_PLL_CTRL0_PU;

 	aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
 	aud_pll_ctrl1 &= SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK |
 			 SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK;

 	for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
 		if (predivs[prediv].parent_rate != parent_rate)
 			continue;
 		for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
 			unsigned long freq;
 			u32 val;

 			val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
 			val |= SSPA_AUD_PLL_CTRL0_PU;
 			val |= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
 			val |= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
 			val |= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
 			val |= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
 			if (val != aud_pll_ctrl0)
 				continue;

 			val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
 			val |= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
 			if (val != aud_pll_ctrl1)
 				continue;

 			freq = predivs[prediv].freq_vco;
 			freq /= postdivs[postdiv].divisor;
 			return freq;
 		}
 	}

 	return 0;
 }

 static long audio_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 				 unsigned long *parent_rate)
 {
 	unsigned int prediv;
 	unsigned int postdiv;
 	long rounded = 0;

 	for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
 		if (predivs[prediv].parent_rate != *parent_rate)
 			continue;
 		for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
 			long freq = predivs[prediv].freq_vco;

 			freq /= postdivs[postdiv].divisor;
 			if (freq == rate)
 				return rate;
 			if (freq < rate)
 				continue;
 			if (rounded && freq > rounded)
 				continue;
 			rounded = freq;
 		}
 	}

 	return rounded;
 }

 static int audio_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 			      unsigned long parent_rate)
 {
 	struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
 	unsigned int prediv;
 	unsigned int postdiv;
 	unsigned long val;

 	for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
 		if (predivs[prediv].parent_rate != parent_rate)
 			continue;

 		for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
 			if (rate * postdivs[postdiv].divisor != predivs[prediv].freq_vco)
 				continue;

 			val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
 			val |= SSPA_AUD_PLL_CTRL0_PU;
 			val |= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
 			val |= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
 			val |= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
 			val |= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
 			writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL0);

 			val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
 			val |= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
 			writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL1);

 			return 0;
 		}
 	}

 	return -ERANGE;
 }

 static const struct clk_ops audio_pll_ops = {
 	.recalc_rate = audio_pll_recalc_rate,
 	.round_rate = audio_pll_round_rate,
 	.set_rate = audio_pll_set_rate,
 };

 static int register_clocks(struct mmp2_audio_clk *priv, struct device *dev)
 {
 	const struct clk_parent_data sspa_mux_parents[] = {
 		{ .hw = &priv->audio_pll_hw },
 		{ .fw_name = "i2s0" },
 	};
 	const struct clk_parent_data sspa1_mux_parents[] = {
 		{ .hw = &priv->audio_pll_hw },
 		{ .fw_name = "i2s1" },
 	};
 	int ret;

 	priv->audio_pll_hw.init = CLK_HW_INIT_FW_NAME("audio_pll",
 				"vctcxo", &audio_pll_ops,
 				CLK_SET_RATE_PARENT);
 	ret = devm_clk_hw_register(dev, &priv->audio_pll_hw);
 	if (ret)
 		return ret;

 	priv->sspa_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa_mux",
 				sspa_mux_parents, &clk_mux_ops,
 				CLK_SET_RATE_PARENT);
 	priv->sspa_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
 	priv->sspa_mux.mask = 1;
 	priv->sspa_mux.shift = SSPA_AUD_CTRL_SSPA0_MUX_SHIFT;
 	ret = devm_clk_hw_register(dev, &priv->sspa_mux.hw);
 	if (ret)
 		return ret;

 	priv->sysclk_div.hw.init = CLK_HW_INIT_HW("sys_div",
 				&priv->sspa_mux.hw, &clk_divider_ops,
 				CLK_SET_RATE_PARENT);
 	priv->sysclk_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
 	priv->sysclk_div.shift = SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT;
 	priv->sysclk_div.width = 6;
 	priv->sysclk_div.flags = CLK_DIVIDER_ONE_BASED;
 	priv->sysclk_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
 	priv->sysclk_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
 	ret = devm_clk_hw_register(dev, &priv->sysclk_div.hw);
 	if (ret)
 		return ret;

 	priv->sysclk_gate.hw.init = CLK_HW_INIT_HW("sys_clk",
 				&priv->sysclk_div.hw, &clk_gate_ops,
 				CLK_SET_RATE_PARENT);
 	priv->sysclk_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
 	priv->sysclk_gate.bit_idx = SSPA_AUD_CTRL_SYSCLK_SHIFT;
 	ret = devm_clk_hw_register(dev, &priv->sysclk_gate.hw);
 	if (ret)
 		return ret;

 	priv->sspa0_div.hw.init = CLK_HW_INIT_HW("sspa0_div",
 				&priv->sspa_mux.hw, &clk_divider_ops, 0);
 	priv->sspa0_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
 	priv->sspa0_div.shift = SSPA_AUD_CTRL_SSPA0_DIV_SHIFT;
 	priv->sspa0_div.width = 6;
 	priv->sspa0_div.flags = CLK_DIVIDER_ONE_BASED;
 	priv->sspa0_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
 	priv->sspa0_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
 	ret = devm_clk_hw_register(dev, &priv->sspa0_div.hw);
 	if (ret)
 		return ret;

 	priv->sspa0_gate.hw.init = CLK_HW_INIT_HW("sspa0_clk",
 				&priv->sspa0_div.hw, &clk_gate_ops,
 				CLK_SET_RATE_PARENT);
 	priv->sspa0_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
 	priv->sspa0_gate.bit_idx = SSPA_AUD_CTRL_SSPA0_SHIFT;
 	ret = devm_clk_hw_register(dev, &priv->sspa0_gate.hw);
 	if (ret)
 		return ret;

 	priv->sspa1_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa1_mux",
 				sspa1_mux_parents, &clk_mux_ops,
 				CLK_SET_RATE_PARENT);
 	priv->sspa1_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
 	priv->sspa1_mux.mask = 1;
 	priv->sspa1_mux.shift = SSPA_AUD_CTRL_SSPA1_MUX_SHIFT;
 	ret = devm_clk_hw_register(dev, &priv->sspa1_mux.hw);
 	if (ret)
 		return ret;

 	priv->sspa1_div.hw.init = CLK_HW_INIT_HW("sspa1_div",
 				&priv->sspa1_mux.hw, &clk_divider_ops, 0);
 	priv->sspa1_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
 	priv->sspa1_div.shift = SSPA_AUD_CTRL_SSPA1_DIV_SHIFT;
 	priv->sspa1_div.width = 6;
 	priv->sspa1_div.flags = CLK_DIVIDER_ONE_BASED;
 	priv->sspa1_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
 	priv->sspa1_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
 	ret = devm_clk_hw_register(dev, &priv->sspa1_div.hw);
 	if (ret)
 		return ret;

 	priv->sspa1_gate.hw.init = CLK_HW_INIT_HW("sspa1_clk",
 				&priv->sspa1_div.hw, &clk_gate_ops,
 				CLK_SET_RATE_PARENT);
 	priv->sspa1_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
 	priv->sspa1_gate.bit_idx = SSPA_AUD_CTRL_SSPA1_SHIFT;
 	ret = devm_clk_hw_register(dev, &priv->sspa1_gate.hw);
 	if (ret)
 		return ret;

 	priv->clk_data.hws[MMP2_CLK_AUDIO_SYSCLK] = &priv->sysclk_gate.hw;
 	priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA0] = &priv->sspa0_gate.hw;
 	priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA1] = &priv->sspa1_gate.hw;
 	priv->clk_data.num = MMP2_CLK_AUDIO_NR_CLKS;

 	return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
 				      &priv->clk_data);
 }

 static int mmp2_audio_clk_probe(struct platform_device *pdev)
 {
 	struct mmp2_audio_clk *priv;
 	int ret;

 	priv = devm_kzalloc(&pdev->dev,
 			    struct_size(priv, clk_data.hws,
 					MMP2_CLK_AUDIO_NR_CLKS),
 			    GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	spin_lock_init(&priv->lock);
 	platform_set_drvdata(pdev, priv);

 	priv->mmio_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->mmio_base))
 		return PTR_ERR(priv->mmio_base);

 	pm_runtime_enable(&pdev->dev);
 	ret = pm_clk_create(&pdev->dev);
 	if (ret)
 		goto disable_pm_runtime;

 	ret = pm_clk_add(&pdev->dev, "audio");
 	if (ret)
 		goto destroy_pm_clk;

 	ret = register_clocks(priv, &pdev->dev);
 	if (ret)
 		goto destroy_pm_clk;

 	return 0;

 destroy_pm_clk:
 	pm_clk_destroy(&pdev->dev);
 disable_pm_runtime:
 	pm_runtime_disable(&pdev->dev);

 	return ret;
 }

 static int mmp2_audio_clk_remove(struct platform_device *pdev)
 {
 	pm_clk_destroy(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);

 	return 0;
 }

 #ifdef CONFIG_PM
 static int mmp2_audio_clk_suspend(struct device *dev)
 {
 	struct mmp2_audio_clk *priv = dev_get_drvdata(dev);

 	priv->aud_ctrl = readl(priv->mmio_base + SSPA_AUD_CTRL);
 	priv->aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
 	priv->aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
 	pm_clk_suspend(dev);

 	return 0;
 }

 static int mmp2_audio_clk_resume(struct device *dev)
 {
 	struct mmp2_audio_clk *priv = dev_get_drvdata(dev);

 	pm_clk_resume(dev);
 	writel(priv->aud_ctrl, priv->mmio_base + SSPA_AUD_CTRL);
 	writel(priv->aud_pll_ctrl0, priv->mmio_base + SSPA_AUD_PLL_CTRL0);
 	writel(priv->aud_pll_ctrl1, priv->mmio_base + SSPA_AUD_PLL_CTRL1);

 	return 0;
 }
 #endif

 static const struct dev_pm_ops mmp2_audio_clk_pm_ops = {
 	SET_RUNTIME_PM_OPS(mmp2_audio_clk_suspend, mmp2_audio_clk_resume, NULL)
 };

 static const struct of_device_id mmp2_audio_clk_of_match[] = {
 	{ .compatible = "marvell,mmp2-audio-clock" },
 	{}
 };

 MODULE_DEVICE_TABLE(of, mmp2_audio_clk_of_match);

 static struct platform_driver mmp2_audio_clk_driver = {
 	.driver = {
 		.name = "mmp2-audio-clock",
 		.of_match_table = of_match_ptr(mmp2_audio_clk_of_match),
 		.pm = &mmp2_audio_clk_pm_ops,
 	},
 	.probe = mmp2_audio_clk_probe,
 	.remove = mmp2_audio_clk_remove,
 };
 module_platform_driver(mmp2_audio_clk_driver);

 MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
 MODULE_DESCRIPTION("Clock driver for MMP2 Audio subsystem");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* MMP Audio Clock Controller driver
	*
	* Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk>
	*/

	#include <linux/clk-provider.h>
	#include <linux/io.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/pm_clock.h>
	#include <linux/pm_runtime.h>
	#include <linux/slab.h>
	#include <dt-bindings/clock/marvell,mmp2-audio.h>

	/* Audio Controller Registers */
	#define SSPA_AUD_CTRL 0x04
	#define SSPA_AUD_PLL_CTRL0 0x08
	#define SSPA_AUD_PLL_CTRL1 0x0c

	/* SSPA Audio Control Register */
	#define SSPA_AUD_CTRL_SYSCLK_SHIFT 0
	#define SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT 1
	#define SSPA_AUD_CTRL_SSPA0_MUX_SHIFT 7
	#define SSPA_AUD_CTRL_SSPA0_SHIFT 8
	#define SSPA_AUD_CTRL_SSPA0_DIV_SHIFT 9
	#define SSPA_AUD_CTRL_SSPA1_SHIFT 16
	#define SSPA_AUD_CTRL_SSPA1_DIV_SHIFT 17
	#define SSPA_AUD_CTRL_SSPA1_MUX_SHIFT 23
	#define SSPA_AUD_CTRL_DIV_MASK 0x7e

	/* SSPA Audio PLL Control 0 Register */
	#define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK (0x7 << 28)
	#define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(x) ((x) << 28)
	#define SSPA_AUD_PLL_CTRL0_FRACT_MASK (0xfffff << 8)
	#define SSPA_AUD_PLL_CTRL0_FRACT(x) ((x) << 8)
	#define SSPA_AUD_PLL_CTRL0_ENA_DITHER (1 << 7)
	#define SSPA_AUD_PLL_CTRL0_ICP_2UA (0 << 5)
	#define SSPA_AUD_PLL_CTRL0_ICP_5UA (1 << 5)
	#define SSPA_AUD_PLL_CTRL0_ICP_7UA (2 << 5)
	#define SSPA_AUD_PLL_CTRL0_ICP_10UA (3 << 5)
	#define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK (0x3 << 3)
	#define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(x) ((x) << 3)
	#define SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK (0x1 << 2)
	#define SSPA_AUD_PLL_CTRL0_DIV_MCLK(x) ((x) << 2)
	#define SSPA_AUD_PLL_CTRL0_PD_OVPROT_DIS (1 << 1)
	#define SSPA_AUD_PLL_CTRL0_PU (1 << 0)

	/* SSPA Audio PLL Control 1 Register */
	#define SSPA_AUD_PLL_CTRL1_SEL_FAST_CLK (1 << 24)
	#define SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK (1 << 11)
	#define SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL (1 << 11)
	#define SSPA_AUD_PLL_CTRL1_CLK_SEL_VCXO (0 << 11)
	#define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK (0x7ff << 0)
	#define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(x) ((x) << 0)

	struct mmp2_audio_clk {
	void __iomem *mmio_base;

	struct clk_hw audio_pll_hw;
	struct clk_mux sspa_mux;
	struct clk_mux sspa1_mux;
	struct clk_divider sysclk_div;
	struct clk_divider sspa0_div;
	struct clk_divider sspa1_div;
	struct clk_gate sysclk_gate;
	struct clk_gate sspa0_gate;
	struct clk_gate sspa1_gate;

	u32 aud_ctrl;
	u32 aud_pll_ctrl0;
	u32 aud_pll_ctrl1;

	spinlock_t lock;

	/* Must be last */
	struct clk_hw_onecell_data clk_data;
	};

	static const struct {
	unsigned long parent_rate;
	unsigned long freq_vco;
	unsigned char mclk;
	unsigned char fbcclk;
	unsigned short fract;
	} predivs[] = {
	{ 26000000, 135475200, 0, 0, 0x8a18 },
	{ 26000000, 147456000, 0, 1, 0x0da1 },
	{ 38400000, 135475200, 1, 2, 0x8208 },
	{ 38400000, 147456000, 1, 3, 0xaaaa },
	};

	static const struct {
	unsigned char divisor;
	unsigned char modulo;
	unsigned char pattern;
	} postdivs[] = {
	{ 1, 3, 0, },
	{ 2, 5, 0, },
	{ 4, 0, 0, },
	{ 6, 1, 1, },
	{ 8, 1, 0, },
	{ 9, 1, 2, },
	{ 12, 2, 1, },
	{ 16, 2, 0, },
	{ 18, 2, 2, },
	{ 24, 4, 1, },
	{ 36, 4, 2, },
	{ 48, 6, 1, },
	{ 72, 6, 2, },
	};

	static unsigned long audio_pll_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
	unsigned int prediv;
	unsigned int postdiv;
	u32 aud_pll_ctrl0;
	u32 aud_pll_ctrl1;

	aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
	aud_pll_ctrl0 &= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK \|
	SSPA_AUD_PLL_CTRL0_FRACT_MASK \|
	SSPA_AUD_PLL_CTRL0_ENA_DITHER \|
	SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK \|
	SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK \|
	SSPA_AUD_PLL_CTRL0_PU;

	aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
	aud_pll_ctrl1 &= SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK \|
	SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK;

	for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
	if (predivs[prediv].parent_rate != parent_rate)
	continue;
	for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
	unsigned long freq;
	u32 val;

	val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
	val \|= SSPA_AUD_PLL_CTRL0_PU;
	val \|= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
	val \|= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
	val \|= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
	val \|= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
	if (val != aud_pll_ctrl0)
	continue;

	val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
	val \|= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
	if (val != aud_pll_ctrl1)
	continue;

	freq = predivs[prediv].freq_vco;
	freq /= postdivs[postdiv].divisor;
	return freq;
	}
	}

	return 0;
	}

	static long audio_pll_round_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long *parent_rate)
	{
	unsigned int prediv;
	unsigned int postdiv;
	long rounded = 0;

	for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
	if (predivs[prediv].parent_rate != *parent_rate)
	continue;
	for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
	long freq = predivs[prediv].freq_vco;

	freq /= postdivs[postdiv].divisor;
	if (freq == rate)
	return rate;
	if (freq < rate)
	continue;
	if (rounded && freq > rounded)
	continue;
	rounded = freq;
	}
	}

	return rounded;
	}

	static int audio_pll_set_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long parent_rate)
	{
	struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
	unsigned int prediv;
	unsigned int postdiv;
	unsigned long val;

	for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
	if (predivs[prediv].parent_rate != parent_rate)
	continue;

	for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
	if (rate * postdivs[postdiv].divisor != predivs[prediv].freq_vco)
	continue;

	val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
	val \|= SSPA_AUD_PLL_CTRL0_PU;
	val \|= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
	val \|= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
	val \|= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
	val \|= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
	writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL0);

	val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
	val \|= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
	writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL1);

	return 0;
	}
	}

	return -ERANGE;
	}

	static const struct clk_ops audio_pll_ops = {
	.recalc_rate = audio_pll_recalc_rate,
	.round_rate = audio_pll_round_rate,
	.set_rate = audio_pll_set_rate,
	};

	static int register_clocks(struct mmp2_audio_clk priv, struct device dev)
	{
	const struct clk_parent_data sspa_mux_parents[] = {
	{ .hw = &priv->audio_pll_hw },
	{ .fw_name = "i2s0" },
	};
	const struct clk_parent_data sspa1_mux_parents[] = {
	{ .hw = &priv->audio_pll_hw },
	{ .fw_name = "i2s1" },
	};
	int ret;

	priv->audio_pll_hw.init = CLK_HW_INIT_FW_NAME("audio_pll",
	"vctcxo", &audio_pll_ops,
	CLK_SET_RATE_PARENT);
	ret = devm_clk_hw_register(dev, &priv->audio_pll_hw);
	if (ret)
	return ret;

	priv->sspa_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa_mux",
	sspa_mux_parents, &clk_mux_ops,
	CLK_SET_RATE_PARENT);
	priv->sspa_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
	priv->sspa_mux.mask = 1;
	priv->sspa_mux.shift = SSPA_AUD_CTRL_SSPA0_MUX_SHIFT;
	ret = devm_clk_hw_register(dev, &priv->sspa_mux.hw);
	if (ret)
	return ret;

	priv->sysclk_div.hw.init = CLK_HW_INIT_HW("sys_div",
	&priv->sspa_mux.hw, &clk_divider_ops,
	CLK_SET_RATE_PARENT);
	priv->sysclk_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
	priv->sysclk_div.shift = SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT;
	priv->sysclk_div.width = 6;
	priv->sysclk_div.flags = CLK_DIVIDER_ONE_BASED;
	priv->sysclk_div.flags \|= CLK_DIVIDER_ROUND_CLOSEST;
	priv->sysclk_div.flags \|= CLK_DIVIDER_ALLOW_ZERO;
	ret = devm_clk_hw_register(dev, &priv->sysclk_div.hw);
	if (ret)
	return ret;

	priv->sysclk_gate.hw.init = CLK_HW_INIT_HW("sys_clk",
	&priv->sysclk_div.hw, &clk_gate_ops,
	CLK_SET_RATE_PARENT);
	priv->sysclk_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
	priv->sysclk_gate.bit_idx = SSPA_AUD_CTRL_SYSCLK_SHIFT;
	ret = devm_clk_hw_register(dev, &priv->sysclk_gate.hw);
	if (ret)
	return ret;

	priv->sspa0_div.hw.init = CLK_HW_INIT_HW("sspa0_div",
	&priv->sspa_mux.hw, &clk_divider_ops, 0);
	priv->sspa0_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
	priv->sspa0_div.shift = SSPA_AUD_CTRL_SSPA0_DIV_SHIFT;
	priv->sspa0_div.width = 6;
	priv->sspa0_div.flags = CLK_DIVIDER_ONE_BASED;
	priv->sspa0_div.flags \|= CLK_DIVIDER_ROUND_CLOSEST;
	priv->sspa0_div.flags \|= CLK_DIVIDER_ALLOW_ZERO;
	ret = devm_clk_hw_register(dev, &priv->sspa0_div.hw);
	if (ret)
	return ret;

	priv->sspa0_gate.hw.init = CLK_HW_INIT_HW("sspa0_clk",
	&priv->sspa0_div.hw, &clk_gate_ops,
	CLK_SET_RATE_PARENT);
	priv->sspa0_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
	priv->sspa0_gate.bit_idx = SSPA_AUD_CTRL_SSPA0_SHIFT;
	ret = devm_clk_hw_register(dev, &priv->sspa0_gate.hw);
	if (ret)
	return ret;

	priv->sspa1_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa1_mux",
	sspa1_mux_parents, &clk_mux_ops,
	CLK_SET_RATE_PARENT);
	priv->sspa1_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
	priv->sspa1_mux.mask = 1;
	priv->sspa1_mux.shift = SSPA_AUD_CTRL_SSPA1_MUX_SHIFT;
	ret = devm_clk_hw_register(dev, &priv->sspa1_mux.hw);
	if (ret)
	return ret;

	priv->sspa1_div.hw.init = CLK_HW_INIT_HW("sspa1_div",
	&priv->sspa1_mux.hw, &clk_divider_ops, 0);
	priv->sspa1_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
	priv->sspa1_div.shift = SSPA_AUD_CTRL_SSPA1_DIV_SHIFT;
	priv->sspa1_div.width = 6;
	priv->sspa1_div.flags = CLK_DIVIDER_ONE_BASED;
	priv->sspa1_div.flags \|= CLK_DIVIDER_ROUND_CLOSEST;
	priv->sspa1_div.flags \|= CLK_DIVIDER_ALLOW_ZERO;
	ret = devm_clk_hw_register(dev, &priv->sspa1_div.hw);
	if (ret)
	return ret;

	priv->sspa1_gate.hw.init = CLK_HW_INIT_HW("sspa1_clk",
	&priv->sspa1_div.hw, &clk_gate_ops,
	CLK_SET_RATE_PARENT);
	priv->sspa1_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
	priv->sspa1_gate.bit_idx = SSPA_AUD_CTRL_SSPA1_SHIFT;
	ret = devm_clk_hw_register(dev, &priv->sspa1_gate.hw);
	if (ret)
	return ret;

	priv->clk_data.hws[MMP2_CLK_AUDIO_SYSCLK] = &priv->sysclk_gate.hw;
	priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA0] = &priv->sspa0_gate.hw;
	priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA1] = &priv->sspa1_gate.hw;
	priv->clk_data.num = MMP2_CLK_AUDIO_NR_CLKS;

	return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
	&priv->clk_data);
	}

	static int mmp2_audio_clk_probe(struct platform_device *pdev)
	{
	struct mmp2_audio_clk *priv;
	int ret;

	priv = devm_kzalloc(&pdev->dev,
	struct_size(priv, clk_data.hws,
	MMP2_CLK_AUDIO_NR_CLKS),
	GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	spin_lock_init(&priv->lock);
	platform_set_drvdata(pdev, priv);

	priv->mmio_base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(priv->mmio_base))
	return PTR_ERR(priv->mmio_base);

	pm_runtime_enable(&pdev->dev);
	ret = pm_clk_create(&pdev->dev);
	if (ret)
	goto disable_pm_runtime;

	ret = pm_clk_add(&pdev->dev, "audio");
	if (ret)
	goto destroy_pm_clk;

	ret = register_clocks(priv, &pdev->dev);
	if (ret)
	goto destroy_pm_clk;

	return 0;

	destroy_pm_clk:
	pm_clk_destroy(&pdev->dev);
	disable_pm_runtime:
	pm_runtime_disable(&pdev->dev);

	return ret;
	}

	static int mmp2_audio_clk_remove(struct platform_device *pdev)
	{
	pm_clk_destroy(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	return 0;
	}

	#ifdef CONFIG_PM
	static int mmp2_audio_clk_suspend(struct device *dev)
	{
	struct mmp2_audio_clk *priv = dev_get_drvdata(dev);

	priv->aud_ctrl = readl(priv->mmio_base + SSPA_AUD_CTRL);
	priv->aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
	priv->aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
	pm_clk_suspend(dev);

	return 0;
	}

	static int mmp2_audio_clk_resume(struct device *dev)
	{
	struct mmp2_audio_clk *priv = dev_get_drvdata(dev);

	pm_clk_resume(dev);
	writel(priv->aud_ctrl, priv->mmio_base + SSPA_AUD_CTRL);
	writel(priv->aud_pll_ctrl0, priv->mmio_base + SSPA_AUD_PLL_CTRL0);
	writel(priv->aud_pll_ctrl1, priv->mmio_base + SSPA_AUD_PLL_CTRL1);

	return 0;
	}
	#endif

	static const struct dev_pm_ops mmp2_audio_clk_pm_ops = {
	SET_RUNTIME_PM_OPS(mmp2_audio_clk_suspend, mmp2_audio_clk_resume, NULL)
	};

	static const struct of_device_id mmp2_audio_clk_of_match[] = {
	{ .compatible = "marvell,mmp2-audio-clock" },
	{}
	};

	MODULE_DEVICE_TABLE(of, mmp2_audio_clk_of_match);

	static struct platform_driver mmp2_audio_clk_driver = {
	.driver = {
	.name = "mmp2-audio-clock",
	.of_match_table = of_match_ptr(mmp2_audio_clk_of_match),
	.pm = &mmp2_audio_clk_pm_ops,
	},
	.probe = mmp2_audio_clk_probe,
	.remove = mmp2_audio_clk_remove,
	};
	module_platform_driver(mmp2_audio_clk_driver);

	MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
	MODULE_DESCRIPTION("Clock driver for MMP2 Audio subsystem");
	MODULE_LICENSE("GPL");