drivers/clk/rockchip/clk-pll.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2014 MundoReader S.L.
  * Author: Heiko Stuebner <heiko@sntech.de>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <asm/div64.h>
 #include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/delay.h>
 #include <linux/clk-provider.h>
 #include <linux/regmap.h>
 #include "clk.h"

 #define PLL_MODE_MASK		0x3
 #define PLL_MODE_SLOW		0x0
 #define PLL_MODE_NORM		0x1
 #define PLL_MODE_DEEP		0x2

 struct rockchip_clk_pll {
 	struct clk_hw		hw;

 	struct clk_mux		pll_mux;
 	const struct clk_ops	*pll_mux_ops;

 	struct notifier_block	clk_nb;

 	void __iomem		*reg_base;
 	int			lock_offset;
 	unsigned int		lock_shift;
 	enum rockchip_pll_type	type;
 	u8			flags;
 	const struct rockchip_pll_rate_table *rate_table;
 	unsigned int		rate_count;
 	spinlock_t		*lock;
 };

 #define to_rockchip_clk_pll(_hw) container_of(_hw, struct rockchip_clk_pll, hw)
 #define to_rockchip_clk_pll_nb(nb) \
 			container_of(nb, struct rockchip_clk_pll, clk_nb)

 static const struct rockchip_pll_rate_table *rockchip_get_pll_settings(
 			    struct rockchip_clk_pll *pll, unsigned long rate)
 {
 	const struct rockchip_pll_rate_table  *rate_table = pll->rate_table;
 	int i;

 	for (i = 0; i < pll->rate_count; i++) {
 		if (rate == rate_table[i].rate)
 			return &rate_table[i];
 	}

 	return NULL;
 }

 static long rockchip_pll_round_rate(struct clk_hw *hw,
 			    unsigned long drate, unsigned long *prate)
 {
 	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
 	const struct rockchip_pll_rate_table *rate_table = pll->rate_table;
 	int i;

 	/* Assumming rate_table is in descending order */
 	for (i = 0; i < pll->rate_count; i++) {
 		if (drate >= rate_table[i].rate)
 			return rate_table[i].rate;
 	}

 	/* return minimum supported value */
 	return rate_table[i - 1].rate;
 }

 /*
  * Wait for the pll to reach the locked state.
  * The calling set_rate function is responsible for making sure the
  * grf regmap is available.
  */
 static int rockchip_pll_wait_lock(struct rockchip_clk_pll *pll)
 {
 	struct regmap *grf = rockchip_clk_get_grf();
 	unsigned int val;
 	int delay = 24000000, ret;

 	while (delay > 0) {
 		ret = regmap_read(grf, pll->lock_offset, &val);
 		if (ret) {
 			pr_err("%s: failed to read pll lock status: %d\n",
 			       __func__, ret);
 			return ret;
 		}

 		if (val & BIT(pll->lock_shift))
 			return 0;
 		delay--;
 	}

 	pr_err("%s: timeout waiting for pll to lock\n", __func__);
 	return -ETIMEDOUT;
 }

 /**
  * PLL used in RK3066, RK3188 and RK3288
  */

 #define RK3066_PLL_RESET_DELAY(nr)	((nr * 500) / 24 + 1)

 #define RK3066_PLLCON(i)		(i * 0x4)
 #define RK3066_PLLCON0_OD_MASK		0xf
 #define RK3066_PLLCON0_OD_SHIFT		0
 #define RK3066_PLLCON0_NR_MASK		0x3f
 #define RK3066_PLLCON0_NR_SHIFT		8
 #define RK3066_PLLCON1_NF_MASK		0x1fff
 #define RK3066_PLLCON1_NF_SHIFT		0
 #define RK3066_PLLCON2_NB_MASK		0xfff
 #define RK3066_PLLCON2_NB_SHIFT		0
 #define RK3066_PLLCON3_RESET		(1 << 5)
 #define RK3066_PLLCON3_PWRDOWN		(1 << 1)
 #define RK3066_PLLCON3_BYPASS		(1 << 0)

 static unsigned long rockchip_rk3066_pll_recalc_rate(struct clk_hw *hw,
 						     unsigned long prate)
 {
 	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
 	u64 nf, nr, no, rate64 = prate;
 	u32 pllcon;

 	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(3));
 	if (pllcon & RK3066_PLLCON3_BYPASS) {
 		pr_debug("%s: pll %s is bypassed\n", __func__,
 			clk_hw_get_name(hw));
 		return prate;
 	}

 	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(1));
 	nf = (pllcon >> RK3066_PLLCON1_NF_SHIFT) & RK3066_PLLCON1_NF_MASK;

 	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(0));
 	nr = (pllcon >> RK3066_PLLCON0_NR_SHIFT) & RK3066_PLLCON0_NR_MASK;
 	no = (pllcon >> RK3066_PLLCON0_OD_SHIFT) & RK3066_PLLCON0_OD_MASK;

 	rate64 *= (nf + 1);
 	do_div(rate64, nr + 1);
 	do_div(rate64, no + 1);

 	return (unsigned long)rate64;
 }

 static int rockchip_rk3066_pll_set_rate(struct clk_hw *hw, unsigned long drate,
 					unsigned long prate)
 {
 	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
 	const struct rockchip_pll_rate_table *rate;
 	unsigned long old_rate = rockchip_rk3066_pll_recalc_rate(hw, prate);
 	struct regmap *grf = rockchip_clk_get_grf();
 	struct clk_mux *pll_mux = &pll->pll_mux;
 	const struct clk_ops *pll_mux_ops = pll->pll_mux_ops;
 	int rate_change_remuxed = 0;
 	int cur_parent;
 	int ret;

 	if (IS_ERR(grf)) {
 		pr_debug("%s: grf regmap not available, aborting rate change\n",
 			 __func__);
 		return PTR_ERR(grf);
 	}

 	pr_debug("%s: changing %s from %lu to %lu with a parent rate of %lu\n",
 		 __func__, clk_hw_get_name(hw), old_rate, drate, prate);

 	/* Get required rate settings from table */
 	rate = rockchip_get_pll_settings(pll, drate);
 	if (!rate) {
 		pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
 			drate, clk_hw_get_name(hw));
 		return -EINVAL;
 	}

 	pr_debug("%s: rate settings for %lu (nr, no, nf): (%d, %d, %d)\n",
 		 __func__, rate->rate, rate->nr, rate->no, rate->nf);

 	cur_parent = pll_mux_ops->get_parent(&pll_mux->hw);
 	if (cur_parent == PLL_MODE_NORM) {
 		pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_SLOW);
 		rate_change_remuxed = 1;
 	}

 	/* enter reset mode */
 	writel(HIWORD_UPDATE(RK3066_PLLCON3_RESET, RK3066_PLLCON3_RESET, 0),
 	       pll->reg_base + RK3066_PLLCON(3));

 	/* update pll values */
 	writel(HIWORD_UPDATE(rate->nr - 1, RK3066_PLLCON0_NR_MASK,
 					   RK3066_PLLCON0_NR_SHIFT) |
 	       HIWORD_UPDATE(rate->no - 1, RK3066_PLLCON0_OD_MASK,
 					   RK3066_PLLCON0_OD_SHIFT),
 	       pll->reg_base + RK3066_PLLCON(0));

 	writel_relaxed(HIWORD_UPDATE(rate->nf - 1, RK3066_PLLCON1_NF_MASK,
 						   RK3066_PLLCON1_NF_SHIFT),
 		       pll->reg_base + RK3066_PLLCON(1));
 	writel_relaxed(HIWORD_UPDATE(rate->nb - 1, RK3066_PLLCON2_NB_MASK,
 						   RK3066_PLLCON2_NB_SHIFT),
 		       pll->reg_base + RK3066_PLLCON(2));

 	/* leave reset and wait the reset_delay */
 	writel(HIWORD_UPDATE(0, RK3066_PLLCON3_RESET, 0),
 	       pll->reg_base + RK3066_PLLCON(3));
 	udelay(RK3066_PLL_RESET_DELAY(rate->nr));

 	/* wait for the pll to lock */
 	ret = rockchip_pll_wait_lock(pll);
 	if (ret) {
 		pr_warn("%s: pll did not lock, trying to restore old rate %lu\n",
 			__func__, old_rate);
 		rockchip_rk3066_pll_set_rate(hw, old_rate, prate);
 	}

 	if (rate_change_remuxed)
 		pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_NORM);

 	return ret;
 }

 static int rockchip_rk3066_pll_enable(struct clk_hw *hw)
 {
 	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);

 	writel(HIWORD_UPDATE(0, RK3066_PLLCON3_PWRDOWN, 0),
 	       pll->reg_base + RK3066_PLLCON(3));

 	return 0;
 }

 static void rockchip_rk3066_pll_disable(struct clk_hw *hw)
 {
 	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);

 	writel(HIWORD_UPDATE(RK3066_PLLCON3_PWRDOWN,
 			     RK3066_PLLCON3_PWRDOWN, 0),
 	       pll->reg_base + RK3066_PLLCON(3));
 }

 static int rockchip_rk3066_pll_is_enabled(struct clk_hw *hw)
 {
 	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
 	u32 pllcon = readl(pll->reg_base + RK3066_PLLCON(3));

 	return !(pllcon & RK3066_PLLCON3_PWRDOWN);
 }

 static void rockchip_rk3066_pll_init(struct clk_hw *hw)
 {
 	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
 	const struct rockchip_pll_rate_table *rate;
 	unsigned int nf, nr, no, nb;
 	unsigned long drate;
 	u32 pllcon;

 	if (!(pll->flags & ROCKCHIP_PLL_SYNC_RATE))
 		return;

 	drate = clk_hw_get_rate(hw);
 	rate = rockchip_get_pll_settings(pll, drate);

 	/* when no rate setting for the current rate, rely on clk_set_rate */
 	if (!rate)
 		return;

 	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(0));
 	nr = ((pllcon >> RK3066_PLLCON0_NR_SHIFT) & RK3066_PLLCON0_NR_MASK) + 1;
 	no = ((pllcon >> RK3066_PLLCON0_OD_SHIFT) & RK3066_PLLCON0_OD_MASK) + 1;

 	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(1));
 	nf = ((pllcon >> RK3066_PLLCON1_NF_SHIFT) & RK3066_PLLCON1_NF_MASK) + 1;

 	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(2));
 	nb = ((pllcon >> RK3066_PLLCON2_NB_SHIFT) & RK3066_PLLCON2_NB_MASK) + 1;

 	pr_debug("%s: pll %s@%lu: nr (%d:%d); no (%d:%d); nf(%d:%d), nb(%d:%d)\n",
 		 __func__, clk_hw_get_name(hw), drate, rate->nr, nr,
 		rate->no, no, rate->nf, nf, rate->nb, nb);
 	if (rate->nr != nr || rate->no != no || rate->nf != nf
 					     || rate->nb != nb) {
 		struct clk_hw *parent = clk_hw_get_parent(hw);
 		unsigned long prate;

 		if (!parent) {
 			pr_warn("%s: parent of %s not available\n",
 				__func__, clk_hw_get_name(hw));
 			return;
 		}

 		pr_debug("%s: pll %s: rate params do not match rate table, adjusting\n",
 			 __func__, clk_hw_get_name(hw));
 		prate = clk_hw_get_rate(parent);
 		rockchip_rk3066_pll_set_rate(hw, drate, prate);
 	}
 }

 static const struct clk_ops rockchip_rk3066_pll_clk_norate_ops = {
 	.recalc_rate = rockchip_rk3066_pll_recalc_rate,
 	.enable = rockchip_rk3066_pll_enable,
 	.disable = rockchip_rk3066_pll_disable,
 	.is_enabled = rockchip_rk3066_pll_is_enabled,
 };

 static const struct clk_ops rockchip_rk3066_pll_clk_ops = {
 	.recalc_rate = rockchip_rk3066_pll_recalc_rate,
 	.round_rate = rockchip_pll_round_rate,
 	.set_rate = rockchip_rk3066_pll_set_rate,
 	.enable = rockchip_rk3066_pll_enable,
 	.disable = rockchip_rk3066_pll_disable,
 	.is_enabled = rockchip_rk3066_pll_is_enabled,
 	.init = rockchip_rk3066_pll_init,
 };

 /*
  * Common registering of pll clocks
  */

 struct clk *rockchip_clk_register_pll(enum rockchip_pll_type pll_type,
 		const char *name, const char *const *parent_names,
 		u8 num_parents, void __iomem *base, int con_offset,
 		int grf_lock_offset, int lock_shift, int mode_offset,
 		int mode_shift, struct rockchip_pll_rate_table *rate_table,
 		u8 clk_pll_flags, spinlock_t *lock)
 {
 	const char *pll_parents[3];
 	struct clk_init_data init;
 	struct rockchip_clk_pll *pll;
 	struct clk_mux *pll_mux;
 	struct clk *pll_clk, *mux_clk;
 	char pll_name[20];

 	if (num_parents != 2) {
 		pr_err("%s: needs two parent clocks\n", __func__);
 		return ERR_PTR(-EINVAL);
 	}

 	/* name the actual pll */
 	snprintf(pll_name, sizeof(pll_name), "pll_%s", name);

 	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
 	if (!pll)
 		return ERR_PTR(-ENOMEM);

 	/* create the mux on top of the real pll */
 	pll->pll_mux_ops = &clk_mux_ops;
 	pll_mux = &pll->pll_mux;
 	pll_mux->reg = base + mode_offset;
 	pll_mux->shift = mode_shift;
 	pll_mux->mask = PLL_MODE_MASK;
 	pll_mux->flags = 0;
 	pll_mux->lock = lock;
 	pll_mux->hw.init = &init;

 	if (pll_type == pll_rk3066)
 		pll_mux->flags |= CLK_MUX_HIWORD_MASK;

 	/* the actual muxing is xin24m, pll-output, xin32k */
 	pll_parents[0] = parent_names[0];
 	pll_parents[1] = pll_name;
 	pll_parents[2] = parent_names[1];

 	init.name = name;
 	init.flags = CLK_SET_RATE_PARENT;
 	init.ops = pll->pll_mux_ops;
 	init.parent_names = pll_parents;
 	init.num_parents = ARRAY_SIZE(pll_parents);

 	mux_clk = clk_register(NULL, &pll_mux->hw);
 	if (IS_ERR(mux_clk))
 		goto err_mux;

 	/* now create the actual pll */
 	init.name = pll_name;

 	/* keep all plls untouched for now */
 	init.flags = CLK_IGNORE_UNUSED;

 	init.parent_names = &parent_names[0];
 	init.num_parents = 1;

 	if (rate_table) {
 		int len;

 		/* find count of rates in rate_table */
 		for (len = 0; rate_table[len].rate != 0; )
 			len++;

 		pll->rate_count = len;
 		pll->rate_table = kmemdup(rate_table,
 					pll->rate_count *
 					sizeof(struct rockchip_pll_rate_table),
 					GFP_KERNEL);
 		WARN(!pll->rate_table,
 			"%s: could not allocate rate table for %s\n",
 			__func__, name);
 	}

 	switch (pll_type) {
 	case pll_rk3066:
 		if (!pll->rate_table)
 			init.ops = &rockchip_rk3066_pll_clk_norate_ops;
 		else
 			init.ops = &rockchip_rk3066_pll_clk_ops;
 		break;
 	default:
 		pr_warn("%s: Unknown pll type for pll clk %s\n",
 			__func__, name);
 	}

 	pll->hw.init = &init;
 	pll->type = pll_type;
 	pll->reg_base = base + con_offset;
 	pll->lock_offset = grf_lock_offset;
 	pll->lock_shift = lock_shift;
 	pll->flags = clk_pll_flags;
 	pll->lock = lock;

 	pll_clk = clk_register(NULL, &pll->hw);
 	if (IS_ERR(pll_clk)) {
 		pr_err("%s: failed to register pll clock %s : %ld\n",
 			__func__, name, PTR_ERR(pll_clk));
 		goto err_pll;
 	}

 	return mux_clk;

 err_pll:
 	clk_unregister(mux_clk);
 	mux_clk = pll_clk;
 err_mux:
 	kfree(pll);
 	return mux_clk;
 }
	/*
	* Copyright (c) 2014 MundoReader S.L.
	* Author: Heiko Stuebner <heiko@sntech.de>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <asm/div64.h>
	#include <linux/slab.h>
	#include <linux/io.h>
	#include <linux/delay.h>
	#include <linux/clk-provider.h>
	#include <linux/regmap.h>
	#include "clk.h"

	#define PLL_MODE_MASK 0x3
	#define PLL_MODE_SLOW 0x0
	#define PLL_MODE_NORM 0x1
	#define PLL_MODE_DEEP 0x2

	struct rockchip_clk_pll {
	struct clk_hw hw;

	struct clk_mux pll_mux;
	const struct clk_ops *pll_mux_ops;

	struct notifier_block clk_nb;

	void __iomem *reg_base;
	int lock_offset;
	unsigned int lock_shift;
	enum rockchip_pll_type type;
	u8 flags;
	const struct rockchip_pll_rate_table *rate_table;
	unsigned int rate_count;
	spinlock_t *lock;
	};

	#define to_rockchip_clk_pll(_hw) container_of(_hw, struct rockchip_clk_pll, hw)
	#define to_rockchip_clk_pll_nb(nb) \
	container_of(nb, struct rockchip_clk_pll, clk_nb)

	static const struct rockchip_pll_rate_table *rockchip_get_pll_settings(
	struct rockchip_clk_pll *pll, unsigned long rate)
	{
	const struct rockchip_pll_rate_table *rate_table = pll->rate_table;
	int i;

	for (i = 0; i < pll->rate_count; i++) {
	if (rate == rate_table[i].rate)
	return &rate_table[i];
	}

	return NULL;
	}

	static long rockchip_pll_round_rate(struct clk_hw *hw,
	unsigned long drate, unsigned long *prate)
	{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	const struct rockchip_pll_rate_table *rate_table = pll->rate_table;
	int i;

	/* Assumming rate_table is in descending order */
	for (i = 0; i < pll->rate_count; i++) {
	if (drate >= rate_table[i].rate)
	return rate_table[i].rate;
	}

	/* return minimum supported value */
	return rate_table[i - 1].rate;
	}

	/*
	* Wait for the pll to reach the locked state.
	* The calling set_rate function is responsible for making sure the
	* grf regmap is available.
	*/
	static int rockchip_pll_wait_lock(struct rockchip_clk_pll *pll)
	{
	struct regmap *grf = rockchip_clk_get_grf();
	unsigned int val;
	int delay = 24000000, ret;

	while (delay > 0) {
	ret = regmap_read(grf, pll->lock_offset, &val);
	if (ret) {
	pr_err("%s: failed to read pll lock status: %d\n",
	__func__, ret);
	return ret;
	}

	if (val & BIT(pll->lock_shift))
	return 0;
	delay--;
	}

	pr_err("%s: timeout waiting for pll to lock\n", __func__);
	return -ETIMEDOUT;
	}

	/**
	* PLL used in RK3066, RK3188 and RK3288
	*/

	#define RK3066_PLL_RESET_DELAY(nr) ((nr * 500) / 24 + 1)

	#define RK3066_PLLCON(i) (i * 0x4)
	#define RK3066_PLLCON0_OD_MASK 0xf
	#define RK3066_PLLCON0_OD_SHIFT 0
	#define RK3066_PLLCON0_NR_MASK 0x3f
	#define RK3066_PLLCON0_NR_SHIFT 8
	#define RK3066_PLLCON1_NF_MASK 0x1fff
	#define RK3066_PLLCON1_NF_SHIFT 0
	#define RK3066_PLLCON2_NB_MASK 0xfff
	#define RK3066_PLLCON2_NB_SHIFT 0
	#define RK3066_PLLCON3_RESET (1 << 5)
	#define RK3066_PLLCON3_PWRDOWN (1 << 1)
	#define RK3066_PLLCON3_BYPASS (1 << 0)

	static unsigned long rockchip_rk3066_pll_recalc_rate(struct clk_hw *hw,
	unsigned long prate)
	{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	u64 nf, nr, no, rate64 = prate;
	u32 pllcon;

	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(3));
	if (pllcon & RK3066_PLLCON3_BYPASS) {
	pr_debug("%s: pll %s is bypassed\n", __func__,
	clk_hw_get_name(hw));
	return prate;
	}

	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(1));
	nf = (pllcon >> RK3066_PLLCON1_NF_SHIFT) & RK3066_PLLCON1_NF_MASK;

	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(0));
	nr = (pllcon >> RK3066_PLLCON0_NR_SHIFT) & RK3066_PLLCON0_NR_MASK;
	no = (pllcon >> RK3066_PLLCON0_OD_SHIFT) & RK3066_PLLCON0_OD_MASK;

	rate64 *= (nf + 1);
	do_div(rate64, nr + 1);
	do_div(rate64, no + 1);

	return (unsigned long)rate64;
	}

	static int rockchip_rk3066_pll_set_rate(struct clk_hw *hw, unsigned long drate,
	unsigned long prate)
	{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	const struct rockchip_pll_rate_table *rate;
	unsigned long old_rate = rockchip_rk3066_pll_recalc_rate(hw, prate);
	struct regmap *grf = rockchip_clk_get_grf();
	struct clk_mux *pll_mux = &pll->pll_mux;
	const struct clk_ops *pll_mux_ops = pll->pll_mux_ops;
	int rate_change_remuxed = 0;
	int cur_parent;
	int ret;

	if (IS_ERR(grf)) {
	pr_debug("%s: grf regmap not available, aborting rate change\n",
	__func__);
	return PTR_ERR(grf);
	}

	pr_debug("%s: changing %s from %lu to %lu with a parent rate of %lu\n",
	__func__, clk_hw_get_name(hw), old_rate, drate, prate);

	/* Get required rate settings from table */
	rate = rockchip_get_pll_settings(pll, drate);
	if (!rate) {
	pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
	drate, clk_hw_get_name(hw));
	return -EINVAL;
	}

	pr_debug("%s: rate settings for %lu (nr, no, nf): (%d, %d, %d)\n",
	__func__, rate->rate, rate->nr, rate->no, rate->nf);

	cur_parent = pll_mux_ops->get_parent(&pll_mux->hw);
	if (cur_parent == PLL_MODE_NORM) {
	pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_SLOW);
	rate_change_remuxed = 1;
	}

	/* enter reset mode */
	writel(HIWORD_UPDATE(RK3066_PLLCON3_RESET, RK3066_PLLCON3_RESET, 0),
	pll->reg_base + RK3066_PLLCON(3));

	/* update pll values */
	writel(HIWORD_UPDATE(rate->nr - 1, RK3066_PLLCON0_NR_MASK,
	RK3066_PLLCON0_NR_SHIFT) \|
	HIWORD_UPDATE(rate->no - 1, RK3066_PLLCON0_OD_MASK,
	RK3066_PLLCON0_OD_SHIFT),
	pll->reg_base + RK3066_PLLCON(0));

	writel_relaxed(HIWORD_UPDATE(rate->nf - 1, RK3066_PLLCON1_NF_MASK,
	RK3066_PLLCON1_NF_SHIFT),
	pll->reg_base + RK3066_PLLCON(1));
	writel_relaxed(HIWORD_UPDATE(rate->nb - 1, RK3066_PLLCON2_NB_MASK,
	RK3066_PLLCON2_NB_SHIFT),
	pll->reg_base + RK3066_PLLCON(2));

	/* leave reset and wait the reset_delay */
	writel(HIWORD_UPDATE(0, RK3066_PLLCON3_RESET, 0),
	pll->reg_base + RK3066_PLLCON(3));
	udelay(RK3066_PLL_RESET_DELAY(rate->nr));

	/* wait for the pll to lock */
	ret = rockchip_pll_wait_lock(pll);
	if (ret) {
	pr_warn("%s: pll did not lock, trying to restore old rate %lu\n",
	__func__, old_rate);
	rockchip_rk3066_pll_set_rate(hw, old_rate, prate);
	}

	if (rate_change_remuxed)
	pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_NORM);

	return ret;
	}

	static int rockchip_rk3066_pll_enable(struct clk_hw *hw)
	{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);

	writel(HIWORD_UPDATE(0, RK3066_PLLCON3_PWRDOWN, 0),
	pll->reg_base + RK3066_PLLCON(3));

	return 0;
	}

	static void rockchip_rk3066_pll_disable(struct clk_hw *hw)
	{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);

	writel(HIWORD_UPDATE(RK3066_PLLCON3_PWRDOWN,
	RK3066_PLLCON3_PWRDOWN, 0),
	pll->reg_base + RK3066_PLLCON(3));
	}

	static int rockchip_rk3066_pll_is_enabled(struct clk_hw *hw)
	{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	u32 pllcon = readl(pll->reg_base + RK3066_PLLCON(3));

	return !(pllcon & RK3066_PLLCON3_PWRDOWN);
	}

	static void rockchip_rk3066_pll_init(struct clk_hw *hw)
	{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	const struct rockchip_pll_rate_table *rate;
	unsigned int nf, nr, no, nb;
	unsigned long drate;
	u32 pllcon;

	if (!(pll->flags & ROCKCHIP_PLL_SYNC_RATE))
	return;

	drate = clk_hw_get_rate(hw);
	rate = rockchip_get_pll_settings(pll, drate);

	/* when no rate setting for the current rate, rely on clk_set_rate */
	if (!rate)
	return;

	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(0));
	nr = ((pllcon >> RK3066_PLLCON0_NR_SHIFT) & RK3066_PLLCON0_NR_MASK) + 1;
	no = ((pllcon >> RK3066_PLLCON0_OD_SHIFT) & RK3066_PLLCON0_OD_MASK) + 1;

	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(1));
	nf = ((pllcon >> RK3066_PLLCON1_NF_SHIFT) & RK3066_PLLCON1_NF_MASK) + 1;

	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(2));
	nb = ((pllcon >> RK3066_PLLCON2_NB_SHIFT) & RK3066_PLLCON2_NB_MASK) + 1;

	pr_debug("%s: pll %s@%lu: nr (%d:%d); no (%d:%d); nf(%d:%d), nb(%d:%d)\n",
	__func__, clk_hw_get_name(hw), drate, rate->nr, nr,
	rate->no, no, rate->nf, nf, rate->nb, nb);
	if (rate->nr != nr \|\| rate->no != no \|\| rate->nf != nf
	\|\| rate->nb != nb) {
	struct clk_hw *parent = clk_hw_get_parent(hw);
	unsigned long prate;

	if (!parent) {
	pr_warn("%s: parent of %s not available\n",
	__func__, clk_hw_get_name(hw));
	return;
	}

	pr_debug("%s: pll %s: rate params do not match rate table, adjusting\n",
	__func__, clk_hw_get_name(hw));
	prate = clk_hw_get_rate(parent);
	rockchip_rk3066_pll_set_rate(hw, drate, prate);
	}
	}

	static const struct clk_ops rockchip_rk3066_pll_clk_norate_ops = {
	.recalc_rate = rockchip_rk3066_pll_recalc_rate,
	.enable = rockchip_rk3066_pll_enable,
	.disable = rockchip_rk3066_pll_disable,
	.is_enabled = rockchip_rk3066_pll_is_enabled,
	};

	static const struct clk_ops rockchip_rk3066_pll_clk_ops = {
	.recalc_rate = rockchip_rk3066_pll_recalc_rate,
	.round_rate = rockchip_pll_round_rate,
	.set_rate = rockchip_rk3066_pll_set_rate,
	.enable = rockchip_rk3066_pll_enable,
	.disable = rockchip_rk3066_pll_disable,
	.is_enabled = rockchip_rk3066_pll_is_enabled,
	.init = rockchip_rk3066_pll_init,
	};

	/*
	* Common registering of pll clocks
	*/

	struct clk *rockchip_clk_register_pll(enum rockchip_pll_type pll_type,
	const char name, const char const *parent_names,
	u8 num_parents, void __iomem *base, int con_offset,
	int grf_lock_offset, int lock_shift, int mode_offset,
	int mode_shift, struct rockchip_pll_rate_table *rate_table,
	u8 clk_pll_flags, spinlock_t *lock)
	{
	const char *pll_parents[3];
	struct clk_init_data init;
	struct rockchip_clk_pll *pll;
	struct clk_mux *pll_mux;
	struct clk pll_clk, mux_clk;
	char pll_name[20];

	if (num_parents != 2) {
	pr_err("%s: needs two parent clocks\n", __func__);
	return ERR_PTR(-EINVAL);
	}

	/* name the actual pll */
	snprintf(pll_name, sizeof(pll_name), "pll_%s", name);

	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
	if (!pll)
	return ERR_PTR(-ENOMEM);

	/* create the mux on top of the real pll */
	pll->pll_mux_ops = &clk_mux_ops;
	pll_mux = &pll->pll_mux;
	pll_mux->reg = base + mode_offset;
	pll_mux->shift = mode_shift;
	pll_mux->mask = PLL_MODE_MASK;
	pll_mux->flags = 0;
	pll_mux->lock = lock;
	pll_mux->hw.init = &init;

	if (pll_type == pll_rk3066)
	pll_mux->flags \|= CLK_MUX_HIWORD_MASK;

	/* the actual muxing is xin24m, pll-output, xin32k */
	pll_parents[0] = parent_names[0];
	pll_parents[1] = pll_name;
	pll_parents[2] = parent_names[1];

	init.name = name;
	init.flags = CLK_SET_RATE_PARENT;
	init.ops = pll->pll_mux_ops;
	init.parent_names = pll_parents;
	init.num_parents = ARRAY_SIZE(pll_parents);

	mux_clk = clk_register(NULL, &pll_mux->hw);
	if (IS_ERR(mux_clk))
	goto err_mux;

	/* now create the actual pll */
	init.name = pll_name;

	/* keep all plls untouched for now */
	init.flags = CLK_IGNORE_UNUSED;

	init.parent_names = &parent_names[0];
	init.num_parents = 1;

	if (rate_table) {
	int len;

	/* find count of rates in rate_table */
	for (len = 0; rate_table[len].rate != 0; )
	len++;

	pll->rate_count = len;
	pll->rate_table = kmemdup(rate_table,
	pll->rate_count *
	sizeof(struct rockchip_pll_rate_table),
	GFP_KERNEL);
	WARN(!pll->rate_table,
	"%s: could not allocate rate table for %s\n",
	__func__, name);
	}

	switch (pll_type) {
	case pll_rk3066:
	if (!pll->rate_table)
	init.ops = &rockchip_rk3066_pll_clk_norate_ops;
	else
	init.ops = &rockchip_rk3066_pll_clk_ops;
	break;
	default:
	pr_warn("%s: Unknown pll type for pll clk %s\n",
	__func__, name);
	}

	pll->hw.init = &init;
	pll->type = pll_type;
	pll->reg_base = base + con_offset;
	pll->lock_offset = grf_lock_offset;
	pll->lock_shift = lock_shift;
	pll->flags = clk_pll_flags;
	pll->lock = lock;

	pll_clk = clk_register(NULL, &pll->hw);
	if (IS_ERR(pll_clk)) {
	pr_err("%s: failed to register pll clock %s : %ld\n",
	__func__, name, PTR_ERR(pll_clk));
	goto err_pll;
	}

	return mux_clk;

	err_pll:
	clk_unregister(mux_clk);
	mux_clk = pll_clk;
	err_mux:
	kfree(pll);
	return mux_clk;
	}