/*
   * Copyright (c) 2013 Samsung Electronics Co., Ltd.
   * Copyright (c) 2013 Linaro Ltd.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * This file contains the utility functions to register the pll clocks.
  */
  
  #include <linux/errno.h>
  #include <linux/hrtimer.h>
  #include "clk.h"
  #include "clk-pll.h"
  
  #define PLL_TIMEOUT_MS		10
  
  struct samsung_clk_pll {
  	struct clk_hw		hw;
  	void __iomem		*lock_reg;
  	void __iomem		*con_reg;
  	enum samsung_pll_type	type;
  	unsigned int		rate_count;
  	const struct samsung_pll_rate_table *rate_table;
  };
  
  #define to_clk_pll(_hw) container_of(_hw, struct samsung_clk_pll, hw)
  
  static const struct samsung_pll_rate_table *samsung_get_pll_settings(
  				struct samsung_clk_pll *pll, unsigned long rate)
  {
  	const struct samsung_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 samsung_pll_round_rate(struct clk_hw *hw,
  			unsigned long drate, unsigned long *prate)
  {
  	struct samsung_clk_pll *pll = to_clk_pll(hw);
  	const struct samsung_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;
  }
  
  /*
   * PLL35xx Clock Type
   */
  /* Maximum lock time can be 270 * PDIV cycles */
  #define PLL35XX_LOCK_FACTOR	(270)
  
  #define PLL35XX_MDIV_MASK       (0x3FF)
  #define PLL35XX_PDIV_MASK       (0x3F)
  #define PLL35XX_SDIV_MASK       (0x7)
  #define PLL35XX_LOCK_STAT_MASK	(0x1)
  #define PLL35XX_MDIV_SHIFT      (16)
  #define PLL35XX_PDIV_SHIFT      (8)
  #define PLL35XX_SDIV_SHIFT      (0)
  #define PLL35XX_LOCK_STAT_SHIFT	(29)
  
  static unsigned long samsung_pll35xx_recalc_rate(struct clk_hw *hw,
  				unsigned long parent_rate)
  {
  	struct samsung_clk_pll *pll = to_clk_pll(hw);
  	u32 mdiv, pdiv, sdiv, pll_con;
  	u64 fvco = parent_rate;
  
  	pll_con = __raw_readl(pll->con_reg);
  	mdiv = (pll_con >> PLL35XX_MDIV_SHIFT) & PLL35XX_MDIV_MASK;
  	pdiv = (pll_con >> PLL35XX_PDIV_SHIFT) & PLL35XX_PDIV_MASK;
  	sdiv = (pll_con >> PLL35XX_SDIV_SHIFT) & PLL35XX_SDIV_MASK;
  
  	fvco *= mdiv;
  	do_div(fvco, (pdiv << sdiv));
  
  	return (unsigned long)fvco;
  }
  
  static inline bool samsung_pll35xx_mp_change(
  		const struct samsung_pll_rate_table *rate, u32 pll_con)
  {
  	u32 old_mdiv, old_pdiv;
  
  	old_mdiv = (pll_con >> PLL35XX_MDIV_SHIFT) & PLL35XX_MDIV_MASK;
  	old_pdiv = (pll_con >> PLL35XX_PDIV_SHIFT) & PLL35XX_PDIV_MASK;
  
  	return (rate->mdiv != old_mdiv || rate->pdiv != old_pdiv);
  }
  
  static int samsung_pll35xx_set_rate(struct clk_hw *hw, unsigned long drate,
  					unsigned long prate)
  {
  	struct samsung_clk_pll *pll = to_clk_pll(hw);
  	const struct samsung_pll_rate_table *rate;
  	u32 tmp;
  
  	/* Get required rate settings from table */
  	rate = samsung_get_pll_settings(pll, drate);
  	if (!rate) {
  		pr_err("%s: Invalid rate : %lu for pll clk %s
  ", __func__,
  			drate, __clk_get_name(hw->clk));
  		return -EINVAL;
  	}
  
  	tmp = __raw_readl(pll->con_reg);
  
  	if (!(samsung_pll35xx_mp_change(rate, tmp))) {
  		/* If only s change, change just s value only*/
  		tmp &= ~(PLL35XX_SDIV_MASK << PLL35XX_SDIV_SHIFT);
  		tmp |= rate->sdiv << PLL35XX_SDIV_SHIFT;
  		__raw_writel(tmp, pll->con_reg);
  
  		return 0;
  	}
  
  	/* Set PLL lock time. */
  	__raw_writel(rate->pdiv * PLL35XX_LOCK_FACTOR,
  			pll->lock_reg);
  
  	/* Change PLL PMS values */
  	tmp &= ~((PLL35XX_MDIV_MASK << PLL35XX_MDIV_SHIFT) |
  			(PLL35XX_PDIV_MASK << PLL35XX_PDIV_SHIFT) |
  			(PLL35XX_SDIV_MASK << PLL35XX_SDIV_SHIFT));
  	tmp |= (rate->mdiv << PLL35XX_MDIV_SHIFT) |
  			(rate->pdiv << PLL35XX_PDIV_SHIFT) |
  			(rate->sdiv << PLL35XX_SDIV_SHIFT);
  	__raw_writel(tmp, pll->con_reg);
  
  	/* wait_lock_time */
  	do {
  		cpu_relax();
  		tmp = __raw_readl(pll->con_reg);
  	} while (!(tmp & (PLL35XX_LOCK_STAT_MASK
  				<< PLL35XX_LOCK_STAT_SHIFT)));
  	return 0;
  }
  
  static const struct clk_ops samsung_pll35xx_clk_ops = {
  	.recalc_rate = samsung_pll35xx_recalc_rate,
  	.round_rate = samsung_pll_round_rate,
  	.set_rate = samsung_pll35xx_set_rate,
  };
  
  static const struct clk_ops samsung_pll35xx_clk_min_ops = {
  	.recalc_rate = samsung_pll35xx_recalc_rate,
  };
  
  /*
   * PLL36xx Clock Type
   */
  /* Maximum lock time can be 3000 * PDIV cycles */
  #define PLL36XX_LOCK_FACTOR    (3000)
  
  #define PLL36XX_KDIV_MASK	(0xFFFF)
  #define PLL36XX_MDIV_MASK	(0x1FF)
  #define PLL36XX_PDIV_MASK	(0x3F)
  #define PLL36XX_SDIV_MASK	(0x7)
  #define PLL36XX_MDIV_SHIFT	(16)
  #define PLL36XX_PDIV_SHIFT	(8)
  #define PLL36XX_SDIV_SHIFT	(0)
  #define PLL36XX_KDIV_SHIFT	(0)
  #define PLL36XX_LOCK_STAT_SHIFT	(29)
  
  static unsigned long samsung_pll36xx_recalc_rate(struct clk_hw *hw,
  				unsigned long parent_rate)
  {
  	struct samsung_clk_pll *pll = to_clk_pll(hw);
  	u32 mdiv, pdiv, sdiv, pll_con0, pll_con1;
  	s16 kdiv;
  	u64 fvco = parent_rate;
  
  	pll_con0 = __raw_readl(pll->con_reg);
  	pll_con1 = __raw_readl(pll->con_reg + 4);
  	mdiv = (pll_con0 >> PLL36XX_MDIV_SHIFT) & PLL36XX_MDIV_MASK;
  	pdiv = (pll_con0 >> PLL36XX_PDIV_SHIFT) & PLL36XX_PDIV_MASK;
  	sdiv = (pll_con0 >> PLL36XX_SDIV_SHIFT) & PLL36XX_SDIV_MASK;
  	kdiv = (s16)(pll_con1 & PLL36XX_KDIV_MASK);
  
  	fvco *= (mdiv << 16) + kdiv;
  	do_div(fvco, (pdiv << sdiv));
  	fvco >>= 16;
  
  	return (unsigned long)fvco;
  }
  
  static inline bool samsung_pll36xx_mpk_change(
  	const struct samsung_pll_rate_table *rate, u32 pll_con0, u32 pll_con1)
  {
  	u32 old_mdiv, old_pdiv, old_kdiv;
  
  	old_mdiv = (pll_con0 >> PLL36XX_MDIV_SHIFT) & PLL36XX_MDIV_MASK;
  	old_pdiv = (pll_con0 >> PLL36XX_PDIV_SHIFT) & PLL36XX_PDIV_MASK;
  	old_kdiv = (pll_con1 >> PLL36XX_KDIV_SHIFT) & PLL36XX_KDIV_MASK;
  
  	return (rate->mdiv != old_mdiv || rate->pdiv != old_pdiv ||
  		rate->kdiv != old_kdiv);
  }
  
  static int samsung_pll36xx_set_rate(struct clk_hw *hw, unsigned long drate,
  					unsigned long parent_rate)
  {
  	struct samsung_clk_pll *pll = to_clk_pll(hw);
  	u32 tmp, pll_con0, pll_con1;
  	const struct samsung_pll_rate_table *rate;
  
  	rate = samsung_get_pll_settings(pll, drate);
  	if (!rate) {
  		pr_err("%s: Invalid rate : %lu for pll clk %s
  ", __func__,
  			drate, __clk_get_name(hw->clk));
  		return -EINVAL;
  	}
  
  	pll_con0 = __raw_readl(pll->con_reg);
  	pll_con1 = __raw_readl(pll->con_reg + 4);
  
  	if (!(samsung_pll36xx_mpk_change(rate, pll_con0, pll_con1))) {
  		/* If only s change, change just s value only*/
  		pll_con0 &= ~(PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT);
  		pll_con0 |= (rate->sdiv << PLL36XX_SDIV_SHIFT);
  		__raw_writel(pll_con0, pll->con_reg);
  
  		return 0;
  	}
  
  	/* Set PLL lock time. */
  	__raw_writel(rate->pdiv * PLL36XX_LOCK_FACTOR, pll->lock_reg);
  
  	 /* Change PLL PMS values */
  	pll_con0 &= ~((PLL36XX_MDIV_MASK << PLL36XX_MDIV_SHIFT) |
  			(PLL36XX_PDIV_MASK << PLL36XX_PDIV_SHIFT) |
  			(PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT));
  	pll_con0 |= (rate->mdiv << PLL36XX_MDIV_SHIFT) |
  			(rate->pdiv << PLL36XX_PDIV_SHIFT) |
  			(rate->sdiv << PLL36XX_SDIV_SHIFT);
  	__raw_writel(pll_con0, pll->con_reg);
  
  	pll_con1 &= ~(PLL36XX_KDIV_MASK << PLL36XX_KDIV_SHIFT);
  	pll_con1 |= rate->kdiv << PLL36XX_KDIV_SHIFT;
  	__raw_writel(pll_con1, pll->con_reg + 4);
  
  	/* wait_lock_time */
  	do {
  		cpu_relax();
  		tmp = __raw_readl(pll->con_reg);
  	} while (!(tmp & (1 << PLL36XX_LOCK_STAT_SHIFT)));
  
  	return 0;
  }
  
  static const struct clk_ops samsung_pll36xx_clk_ops = {
  	.recalc_rate = samsung_pll36xx_recalc_rate,
  	.set_rate = samsung_pll36xx_set_rate,
  	.round_rate = samsung_pll_round_rate,
  };
  
  static const struct clk_ops samsung_pll36xx_clk_min_ops = {
  	.recalc_rate = samsung_pll36xx_recalc_rate,
  };
  
  /*
   * PLL45xx Clock Type
   */
  #define PLL4502_LOCK_FACTOR	400
  #define PLL4508_LOCK_FACTOR	240
  
  #define PLL45XX_MDIV_MASK	(0x3FF)
  #define PLL45XX_PDIV_MASK	(0x3F)
  #define PLL45XX_SDIV_MASK	(0x7)
  #define PLL45XX_AFC_MASK	(0x1F)
  #define PLL45XX_MDIV_SHIFT	(16)
  #define PLL45XX_PDIV_SHIFT	(8)
  #define PLL45XX_SDIV_SHIFT	(0)
  #define PLL45XX_AFC_SHIFT	(0)
  
  #define PLL45XX_ENABLE		BIT(31)
  #define PLL45XX_LOCKED		BIT(29)
  
  static unsigned long samsung_pll45xx_recalc_rate(struct clk_hw *hw,
  				unsigned long parent_rate)
  {
  	struct samsung_clk_pll *pll = to_clk_pll(hw);
  	u32 mdiv, pdiv, sdiv, pll_con;
  	u64 fvco = parent_rate;
  
  	pll_con = __raw_readl(pll->con_reg);
  	mdiv = (pll_con >> PLL45XX_MDIV_SHIFT) & PLL45XX_MDIV_MASK;
  	pdiv = (pll_con >> PLL45XX_PDIV_SHIFT) & PLL45XX_PDIV_MASK;
  	sdiv = (pll_con >> PLL45XX_SDIV_SHIFT) & PLL45XX_SDIV_MASK;
  
  	if (pll->type == pll_4508)
  		sdiv = sdiv - 1;
  
  	fvco *= mdiv;
  	do_div(fvco, (pdiv << sdiv));
  
  	return (unsigned long)fvco;
  }
  
  static bool samsung_pll45xx_mp_change(u32 pll_con0, u32 pll_con1,
  				const struct samsung_pll_rate_table *rate)
  {
  	u32 old_mdiv, old_pdiv, old_afc;
  
  	old_mdiv = (pll_con0 >> PLL45XX_MDIV_SHIFT) & PLL45XX_MDIV_MASK;
  	old_pdiv = (pll_con0 >> PLL45XX_PDIV_SHIFT) & PLL45XX_PDIV_MASK;
  	old_afc = (pll_con1 >> PLL45XX_AFC_SHIFT) & PLL45XX_AFC_MASK;
  
  	return (old_mdiv != rate->mdiv || old_pdiv != rate->pdiv
  		|| old_afc != rate->afc);
  }
  
  static int samsung_pll45xx_set_rate(struct clk_hw *hw, unsigned long drate,
  					unsigned long prate)
  {
  	struct samsung_clk_pll *pll = to_clk_pll(hw);
  	const struct samsung_pll_rate_table *rate;
  	u32 con0, con1;
  	ktime_t start;
  
  	/* Get required rate settings from table */
  	rate = samsung_get_pll_settings(pll, drate);
  	if (!rate) {
  		pr_err("%s: Invalid rate : %lu for pll clk %s
  ", __func__,
  			drate, __clk_get_name(hw->clk));
  		return -EINVAL;
  	}
  
  	con0 = __raw_readl(pll->con_reg);
  	con1 = __raw_readl(pll->con_reg + 0x4);
  
  	if (!(samsung_pll45xx_mp_change(con0, con1, rate))) {
  		/* If only s change, change just s value only*/
  		con0 &= ~(PLL45XX_SDIV_MASK << PLL45XX_SDIV_SHIFT);
  		con0 |= rate->sdiv << PLL45XX_SDIV_SHIFT;
  		__raw_writel(con0, pll->con_reg);
  
  		return 0;
  	}
  
  	/* Set PLL PMS values. */
  	con0 &= ~((PLL45XX_MDIV_MASK << PLL45XX_MDIV_SHIFT) |
  			(PLL45XX_PDIV_MASK << PLL45XX_PDIV_SHIFT) |
  			(PLL45XX_SDIV_MASK << PLL45XX_SDIV_SHIFT));
  	con0 |= (rate->mdiv << PLL45XX_MDIV_SHIFT) |
  			(rate->pdiv << PLL45XX_PDIV_SHIFT) |
  			(rate->sdiv << PLL45XX_SDIV_SHIFT);
  
  	/* Set PLL AFC value. */
  	con1 = __raw_readl(pll->con_reg + 0x4);
  	con1 &= ~(PLL45XX_AFC_MASK << PLL45XX_AFC_SHIFT);
  	con1 |= (rate->afc << PLL45XX_AFC_SHIFT);
  
  	/* Set PLL lock time. */
  	switch (pll->type) {
  	case pll_4502:
  		__raw_writel(rate->pdiv * PLL4502_LOCK_FACTOR, pll->lock_reg);
  		break;
  	case pll_4508:
  		__raw_writel(rate->pdiv * PLL4508_LOCK_FACTOR, pll->lock_reg);
  		break;
  	default:
  		break;
  	}
  
  	/* Set new configuration. */
  	__raw_writel(con1, pll->con_reg + 0x4);
  	__raw_writel(con0, pll->con_reg);
  
  	/* Wait for locking. */
  	start = ktime_get();
  	while (!(__raw_readl(pll->con_reg) & PLL45XX_LOCKED)) {
  		ktime_t delta = ktime_sub(ktime_get(), start);
  
  		if (ktime_to_ms(delta) > PLL_TIMEOUT_MS) {
  			pr_err("%s: could not lock PLL %s
  ",
  					__func__, __clk_get_name(hw->clk));
  			return -EFAULT;
  		}
  
  		cpu_relax();
  	}
  
  	return 0;
  }
  
  static const struct clk_ops samsung_pll45xx_clk_ops = {
  	.recalc_rate = samsung_pll45xx_recalc_rate,
  	.round_rate = samsung_pll_round_rate,
  	.set_rate = samsung_pll45xx_set_rate,
  };
  
  static const struct clk_ops samsung_pll45xx_clk_min_ops = {
  	.recalc_rate = samsung_pll45xx_recalc_rate,
  };
  
  /*
   * PLL46xx Clock Type
   */
  #define PLL46XX_LOCK_FACTOR	3000
  
  #define PLL46XX_VSEL_MASK	(1)
  #define PLL46XX_MDIV_MASK	(0x1FF)
  #define PLL46XX_PDIV_MASK	(0x3F)
  #define PLL46XX_SDIV_MASK	(0x7)
  #define PLL46XX_VSEL_SHIFT	(27)
  #define PLL46XX_MDIV_SHIFT	(16)
  #define PLL46XX_PDIV_SHIFT	(8)
  #define PLL46XX_SDIV_SHIFT	(0)
  
  #define PLL46XX_KDIV_MASK	(0xFFFF)
  #define PLL4650C_KDIV_MASK	(0xFFF)
  #define PLL46XX_KDIV_SHIFT	(0)
  #define PLL46XX_MFR_MASK	(0x3F)
  #define PLL46XX_MRR_MASK	(0x1F)
  #define PLL46XX_KDIV_SHIFT	(0)
  #define PLL46XX_MFR_SHIFT	(16)
  #define PLL46XX_MRR_SHIFT	(24)
  
  #define PLL46XX_ENABLE		BIT(31)
  #define PLL46XX_LOCKED		BIT(29)
  #define PLL46XX_VSEL		BIT(27)
  
  static unsigned long samsung_pll46xx_recalc_rate(struct clk_hw *hw,
  				unsigned long parent_rate)
  {
  	struct samsung_clk_pll *pll = to_clk_pll(hw);
  	u32 mdiv, pdiv, sdiv, kdiv, pll_con0, pll_con1, shift;
  	u64 fvco = parent_rate;
  
  	pll_con0 = __raw_readl(pll->con_reg);
  	pll_con1 = __raw_readl(pll->con_reg + 4);
  	mdiv = (pll_con0 >> PLL46XX_MDIV_SHIFT) & PLL46XX_MDIV_MASK;
  	pdiv = (pll_con0 >> PLL46XX_PDIV_SHIFT) & PLL46XX_PDIV_MASK;
  	sdiv = (pll_con0 >> PLL46XX_SDIV_SHIFT) & PLL46XX_SDIV_MASK;
  	kdiv = pll->type == pll_4650c ? pll_con1 & PLL4650C_KDIV_MASK :
  					pll_con1 & PLL46XX_KDIV_MASK;
  
  	shift = pll->type == pll_4600 ? 16 : 10;
  	fvco *= (mdiv << shift) + kdiv;
  	do_div(fvco, (pdiv << sdiv));
  	fvco >>= shift;
  
  	return (unsigned long)fvco;
  }
  
  static bool samsung_pll46xx_mpk_change(u32 pll_con0, u32 pll_con1,
  				const struct samsung_pll_rate_table *rate)
  {
  	u32 old_mdiv, old_pdiv, old_kdiv;
  
  	old_mdiv = (pll_con0 >> PLL46XX_MDIV_SHIFT) & PLL46XX_MDIV_MASK;
  	old_pdiv = (pll_con0 >> PLL46XX_PDIV_SHIFT) & PLL46XX_PDIV_MASK;
  	old_kdiv = (pll_con1 >> PLL46XX_KDIV_SHIFT) & PLL46XX_KDIV_MASK;
  
  	return (old_mdiv != rate->mdiv || old_pdiv != rate->pdiv
  		|| old_kdiv != rate->kdiv);
  }
  
  static int samsung_pll46xx_set_rate(struct clk_hw *hw, unsigned long drate,
  					unsigned long prate)
  {
  	struct samsung_clk_pll *pll = to_clk_pll(hw);
  	const struct samsung_pll_rate_table *rate;
  	u32 con0, con1, lock;
  	ktime_t start;
  
  	/* Get required rate settings from table */
  	rate = samsung_get_pll_settings(pll, drate);
  	if (!rate) {
  		pr_err("%s: Invalid rate : %lu for pll clk %s
  ", __func__,
  			drate, __clk_get_name(hw->clk));
  		return -EINVAL;
  	}
  
  	con0 = __raw_readl(pll->con_reg);
  	con1 = __raw_readl(pll->con_reg + 0x4);
  
  	if (!(samsung_pll46xx_mpk_change(con0, con1, rate))) {
  		/* If only s change, change just s value only*/
  		con0 &= ~(PLL46XX_SDIV_MASK << PLL46XX_SDIV_SHIFT);
  		con0 |= rate->sdiv << PLL46XX_SDIV_SHIFT;
  		__raw_writel(con0, pll->con_reg);
  
  		return 0;
  	}
  
  	/* Set PLL lock time. */
  	lock = rate->pdiv * PLL46XX_LOCK_FACTOR;
  	if (lock > 0xffff)
  		/* Maximum lock time bitfield is 16-bit. */
  		lock = 0xffff;
  
  	/* Set PLL PMS and VSEL values. */
  	con0 &= ~((PLL46XX_MDIV_MASK << PLL46XX_MDIV_SHIFT) |
  			(PLL46XX_PDIV_MASK << PLL46XX_PDIV_SHIFT) |
  			(PLL46XX_SDIV_MASK << PLL46XX_SDIV_SHIFT) |
  			(PLL46XX_VSEL_MASK << PLL46XX_VSEL_SHIFT));
  	con0 |= (rate->mdiv << PLL46XX_MDIV_SHIFT) |
  			(rate->pdiv << PLL46XX_PDIV_SHIFT) |
  			(rate->sdiv << PLL46XX_SDIV_SHIFT) |
  			(rate->vsel << PLL46XX_VSEL_SHIFT);
  
  	/* Set PLL K, MFR and MRR values. */
  	con1 = __raw_readl(pll->con_reg + 0x4);
  	con1 &= ~((PLL46XX_KDIV_MASK << PLL46XX_KDIV_SHIFT) |
  			(PLL46XX_MFR_MASK << PLL46XX_MFR_SHIFT) |
  			(PLL46XX_MRR_MASK << PLL46XX_MRR_SHIFT));
  	con1 |= (rate->kdiv << PLL46XX_KDIV_SHIFT) |
  			(rate->mfr << PLL46XX_MFR_SHIFT) |
  			(rate->mrr << PLL46XX_MRR_SHIFT);
  
  	/* Write configuration to PLL */
  	__raw_writel(lock, pll->lock_reg);
  	__raw_writel(con0, pll->con_reg);
  	__raw_writel(con1, pll->con_reg + 0x4);
  
  	/* Wait for locking. */
  	start = ktime_get();
  	while (!(__raw_readl(pll->con_reg) & PLL46XX_LOCKED)) {
  		ktime_t delta = ktime_sub(ktime_get(), start);
  
  		if (ktime_to_ms(delta) > PLL_TIMEOUT_MS) {
  			pr_err("%s: could not lock PLL %s
  ",
  					__func__, __clk_get_name(hw->clk));
  			return -EFAULT;
  		}
  
  		cpu_relax();
  	}
  
  	return 0;
  }
  
  static const struct clk_ops samsung_pll46xx_clk_ops = {
  	.recalc_rate = samsung_pll46xx_recalc_rate,
  	.round_rate = samsung_pll_round_rate,
  	.set_rate = samsung_pll46xx_set_rate,
  };
  
  static const struct clk_ops samsung_pll46xx_clk_min_ops = {
  	.recalc_rate = samsung_pll46xx_recalc_rate,
  };
  
  /*
   * PLL6552 Clock Type
   */
  
  #define PLL6552_MDIV_MASK	0x3ff
  #define PLL6552_PDIV_MASK	0x3f
  #define PLL6552_SDIV_MASK	0x7
  #define PLL6552_MDIV_SHIFT	16
  #define PLL6552_PDIV_SHIFT	8
  #define PLL6552_SDIV_SHIFT	0
  
  static unsigned long samsung_pll6552_recalc_rate(struct clk_hw *hw,
  						unsigned long parent_rate)
  {
  	struct samsung_clk_pll *pll = to_clk_pll(hw);
  	u32 mdiv, pdiv, sdiv, pll_con;
  	u64 fvco = parent_rate;
  
  	pll_con = __raw_readl(pll->con_reg);
  	mdiv = (pll_con >> PLL6552_MDIV_SHIFT) & PLL6552_MDIV_MASK;
  	pdiv = (pll_con >> PLL6552_PDIV_SHIFT) & PLL6552_PDIV_MASK;
  	sdiv = (pll_con >> PLL6552_SDIV_SHIFT) & PLL6552_SDIV_MASK;
  
  	fvco *= mdiv;
  	do_div(fvco, (pdiv << sdiv));
  
  	return (unsigned long)fvco;
  }
  
  static const struct clk_ops samsung_pll6552_clk_ops = {
  	.recalc_rate = samsung_pll6552_recalc_rate,
  };
  
  /*
   * PLL6553 Clock Type
   */
  
  #define PLL6553_MDIV_MASK	0xff
  #define PLL6553_PDIV_MASK	0x3f
  #define PLL6553_SDIV_MASK	0x7
  #define PLL6553_KDIV_MASK	0xffff
  #define PLL6553_MDIV_SHIFT	16
  #define PLL6553_PDIV_SHIFT	8
  #define PLL6553_SDIV_SHIFT	0
  #define PLL6553_KDIV_SHIFT	0
  
  static unsigned long samsung_pll6553_recalc_rate(struct clk_hw *hw,
  						unsigned long parent_rate)
  {
  	struct samsung_clk_pll *pll = to_clk_pll(hw);
  	u32 mdiv, pdiv, sdiv, kdiv, pll_con0, pll_con1;
  	u64 fvco = parent_rate;
  
  	pll_con0 = __raw_readl(pll->con_reg);
  	pll_con1 = __raw_readl(pll->con_reg + 0x4);
  	mdiv = (pll_con0 >> PLL6553_MDIV_SHIFT) & PLL6553_MDIV_MASK;
  	pdiv = (pll_con0 >> PLL6553_PDIV_SHIFT) & PLL6553_PDIV_MASK;
  	sdiv = (pll_con0 >> PLL6553_SDIV_SHIFT) & PLL6553_SDIV_MASK;
  	kdiv = (pll_con1 >> PLL6553_KDIV_SHIFT) & PLL6553_KDIV_MASK;
  
  	fvco *= (mdiv << 16) + kdiv;
  	do_div(fvco, (pdiv << sdiv));
  	fvco >>= 16;
  
  	return (unsigned long)fvco;
  }
  
  static const struct clk_ops samsung_pll6553_clk_ops = {
  	.recalc_rate = samsung_pll6553_recalc_rate,
  };
  
  /*
   * PLL2550x Clock Type
   */
  
  #define PLL2550X_R_MASK       (0x1)
  #define PLL2550X_P_MASK       (0x3F)
  #define PLL2550X_M_MASK       (0x3FF)
  #define PLL2550X_S_MASK       (0x7)
  #define PLL2550X_R_SHIFT      (20)
  #define PLL2550X_P_SHIFT      (14)
  #define PLL2550X_M_SHIFT      (4)
  #define PLL2550X_S_SHIFT      (0)
  
  struct samsung_clk_pll2550x {
  	struct clk_hw		hw;
  	const void __iomem	*reg_base;
  	unsigned long		offset;
  };
  
  #define to_clk_pll2550x(_hw) container_of(_hw, struct samsung_clk_pll2550x, hw)
  
  static unsigned long samsung_pll2550x_recalc_rate(struct clk_hw *hw,
  				unsigned long parent_rate)
  {
  	struct samsung_clk_pll2550x *pll = to_clk_pll2550x(hw);
  	u32 r, p, m, s, pll_stat;
  	u64 fvco = parent_rate;
  
  	pll_stat = __raw_readl(pll->reg_base + pll->offset * 3);
  	r = (pll_stat >> PLL2550X_R_SHIFT) & PLL2550X_R_MASK;
  	if (!r)
  		return 0;
  	p = (pll_stat >> PLL2550X_P_SHIFT) & PLL2550X_P_MASK;
  	m = (pll_stat >> PLL2550X_M_SHIFT) & PLL2550X_M_MASK;
  	s = (pll_stat >> PLL2550X_S_SHIFT) & PLL2550X_S_MASK;
  
  	fvco *= m;
  	do_div(fvco, (p << s));
  
  	return (unsigned long)fvco;
  }
  
  static const struct clk_ops samsung_pll2550x_clk_ops = {
  	.recalc_rate = samsung_pll2550x_recalc_rate,
  };
  
  struct clk * __init samsung_clk_register_pll2550x(const char *name,
  			const char *pname, const void __iomem *reg_base,
  			const unsigned long offset)
  {
  	struct samsung_clk_pll2550x *pll;
  	struct clk *clk;
  	struct clk_init_data init;
  
  	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
  	if (!pll) {
  		pr_err("%s: could not allocate pll clk %s
  ", __func__, name);
  		return NULL;
  	}
  
  	init.name = name;
  	init.ops = &samsung_pll2550x_clk_ops;
  	init.flags = CLK_GET_RATE_NOCACHE;
  	init.parent_names = &pname;
  	init.num_parents = 1;
  
  	pll->hw.init = &init;
  	pll->reg_base = reg_base;
  	pll->offset = offset;
  
  	clk = clk_register(NULL, &pll->hw);
  	if (IS_ERR(clk)) {
  		pr_err("%s: failed to register pll clock %s
  ", __func__,
  				name);
  		kfree(pll);
  	}
  
  	if (clk_register_clkdev(clk, name, NULL))
  		pr_err("%s: failed to register lookup for %s", __func__, name);
  
  	return clk;
  }
  
  static void __init _samsung_clk_register_pll(struct samsung_pll_clock *pll_clk,
  						void __iomem *base)
  {
  	struct samsung_clk_pll *pll;
  	struct clk *clk;
  	struct clk_init_data init;
  	int ret, len;
  
  	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
  	if (!pll) {
  		pr_err("%s: could not allocate pll clk %s
  ",
  			__func__, pll_clk->name);
  		return;
  	}
  
  	init.name = pll_clk->name;
  	init.flags = pll_clk->flags;
  	init.parent_names = &pll_clk->parent_name;
  	init.num_parents = 1;
  
  	if (pll_clk->rate_table) {
  		/* find count of rates in rate_table */
  		for (len = 0; pll_clk->rate_table[len].rate != 0; )
  			len++;
  
  		pll->rate_count = len;
  		pll->rate_table = kmemdup(pll_clk->rate_table,
  					pll->rate_count *
  					sizeof(struct samsung_pll_rate_table),
  					GFP_KERNEL);
  		WARN(!pll->rate_table,
  			"%s: could not allocate rate table for %s
  ",
  			__func__, pll_clk->name);
  	}
  
  	switch (pll_clk->type) {
  	/* clk_ops for 35xx and 2550 are similar */
  	case pll_35xx:
  	case pll_2550:
  		if (!pll->rate_table)
  			init.ops = &samsung_pll35xx_clk_min_ops;
  		else
  			init.ops = &samsung_pll35xx_clk_ops;
  		break;
  	case pll_4500:
  		init.ops = &samsung_pll45xx_clk_min_ops;
  		break;
  	case pll_4502:
  	case pll_4508:
  		if (!pll->rate_table)
  			init.ops = &samsung_pll45xx_clk_min_ops;
  		else
  			init.ops = &samsung_pll45xx_clk_ops;
  		break;
  	/* clk_ops for 36xx and 2650 are similar */
  	case pll_36xx:
  	case pll_2650:
  		if (!pll->rate_table)
  			init.ops = &samsung_pll36xx_clk_min_ops;
  		else
  			init.ops = &samsung_pll36xx_clk_ops;
  		break;
  	case pll_6552:
  		init.ops = &samsung_pll6552_clk_ops;
  		break;
  	case pll_6553:
  		init.ops = &samsung_pll6553_clk_ops;
  		break;
  	case pll_4600:
  	case pll_4650:
  	case pll_4650c:
  		if (!pll->rate_table)
  			init.ops = &samsung_pll46xx_clk_min_ops;
  		else
  			init.ops = &samsung_pll46xx_clk_ops;
  		break;
  	default:
  		pr_warn("%s: Unknown pll type for pll clk %s
  ",
  			__func__, pll_clk->name);
  	}
  
  	pll->hw.init = &init;
  	pll->type = pll_clk->type;
  	pll->lock_reg = base + pll_clk->lock_offset;
  	pll->con_reg = base + pll_clk->con_offset;
  
  	clk = clk_register(NULL, &pll->hw);
  	if (IS_ERR(clk)) {
  		pr_err("%s: failed to register pll clock %s : %ld
  ",
  			__func__, pll_clk->name, PTR_ERR(clk));
  		kfree(pll);
  		return;
  	}
  
  	samsung_clk_add_lookup(clk, pll_clk->id);
  
  	if (!pll_clk->alias)
  		return;
  
  	ret = clk_register_clkdev(clk, pll_clk->alias, pll_clk->dev_name);
  	if (ret)
  		pr_err("%s: failed to register lookup for %s : %d",
  			__func__, pll_clk->name, ret);
  }
  
  void __init samsung_clk_register_pll(struct samsung_pll_clock *pll_list,
  				unsigned int nr_pll, void __iomem *base)
  {
  	int cnt;
  
  	for (cnt = 0; cnt < nr_pll; cnt++)
  		_samsung_clk_register_pll(&pll_list[cnt], base);
  }