drivers/clk/imx/clk-pllv3.c - kernel/bruno - Git at Google

 /*
  * Copyright 2012 Freescale Semiconductor, Inc.
  * Copyright 2012 Linaro Ltd.
  *
  * The code contained herein is licensed under the GNU General Public
  * License. You may obtain a copy of the GNU General Public License
  * Version 2 or later at the following locations:
  *
  * http://www.opensource.org/licenses/gpl-license.html
  * http://www.gnu.org/copyleft/gpl.html
  */

 #include <linux/clk-provider.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/jiffies.h>
 #include <linux/err.h>
 #include "clk.h"

 #define PLL_NUM_OFFSET		0x10
 #define PLL_DENOM_OFFSET	0x20

 #define BM_PLL_POWER		(0x1 << 12)
 #define BM_PLL_LOCK		(0x1 << 31)
 #define IMX7_ENET_PLL_POWER	(0x1 << 5)

 /**
  * struct clk_pllv3 - IMX PLL clock version 3
  * @clk_hw:	 clock source
  * @base:	 base address of PLL registers
  * @powerup_set: set POWER bit to power up the PLL
  * @powerdown:   pll powerdown offset bit
  * @div_mask:	 mask of divider bits
  * @div_shift:	 shift of divider bits
  *
  * IMX PLL clock version 3, found on i.MX6 series.  Divider for pllv3
  * is actually a multiplier, and always sits at bit 0.
  */
 struct clk_pllv3 {
 	struct clk_hw	hw;
 	void __iomem	*base;
 	bool		powerup_set;
 	u32		powerdown;
 	u32		div_mask;
 	u32		div_shift;
 };

 #define to_clk_pllv3(_hw) container_of(_hw, struct clk_pllv3, hw)

 static int clk_pllv3_wait_lock(struct clk_pllv3 *pll)
 {
 	unsigned long timeout = jiffies + msecs_to_jiffies(10);
 	u32 val = readl_relaxed(pll->base) & pll->powerdown;

 	/* No need to wait for lock when pll is not powered up */
 	if ((pll->powerup_set && !val) || (!pll->powerup_set && val))
 		return 0;

 	/* Wait for PLL to lock */
 	do {
 		if (readl_relaxed(pll->base) & BM_PLL_LOCK)
 			break;
 		if (time_after(jiffies, timeout))
 			break;
 		usleep_range(50, 500);
 	} while (1);

 	return readl_relaxed(pll->base) & BM_PLL_LOCK ? 0 : -ETIMEDOUT;
 }

 static int clk_pllv3_prepare(struct clk_hw *hw)
 {
 	struct clk_pllv3 *pll = to_clk_pllv3(hw);
 	u32 val;

 	val = readl_relaxed(pll->base);
 	if (pll->powerup_set)
 		val |= BM_PLL_POWER;
 	else
 		val &= ~BM_PLL_POWER;
 	writel_relaxed(val, pll->base);

 	return clk_pllv3_wait_lock(pll);
 }

 static void clk_pllv3_unprepare(struct clk_hw *hw)
 {
 	struct clk_pllv3 *pll = to_clk_pllv3(hw);
 	u32 val;

 	val = readl_relaxed(pll->base);
 	if (pll->powerup_set)
 		val &= ~BM_PLL_POWER;
 	else
 		val |= BM_PLL_POWER;
 	writel_relaxed(val, pll->base);
 }

 static unsigned long clk_pllv3_recalc_rate(struct clk_hw *hw,
 					   unsigned long parent_rate)
 {
 	struct clk_pllv3 *pll = to_clk_pllv3(hw);
 	u32 div = (readl_relaxed(pll->base) >> pll->div_shift)  & pll->div_mask;

 	return (div == 1) ? parent_rate * 22 : parent_rate * 20;
 }

 static long clk_pllv3_round_rate(struct clk_hw *hw, unsigned long rate,
 				 unsigned long *prate)
 {
 	unsigned long parent_rate = *prate;

 	return (rate >= parent_rate * 22) ? parent_rate * 22 :
 					    parent_rate * 20;
 }

 static int clk_pllv3_set_rate(struct clk_hw *hw, unsigned long rate,
 		unsigned long parent_rate)
 {
 	struct clk_pllv3 *pll = to_clk_pllv3(hw);
 	u32 val, div;

 	if (rate == parent_rate * 22)
 		div = 1;
 	else if (rate == parent_rate * 20)
 		div = 0;
 	else
 		return -EINVAL;

 	val = readl_relaxed(pll->base);
 	val &= ~(pll->div_mask << pll->div_shift);
 	val |= (div << pll->div_shift);
 	writel_relaxed(val, pll->base);

 	return clk_pllv3_wait_lock(pll);
 }

 static const struct clk_ops clk_pllv3_ops = {
 	.prepare	= clk_pllv3_prepare,
 	.unprepare	= clk_pllv3_unprepare,
 	.recalc_rate	= clk_pllv3_recalc_rate,
 	.round_rate	= clk_pllv3_round_rate,
 	.set_rate	= clk_pllv3_set_rate,
 };

 static unsigned long clk_pllv3_sys_recalc_rate(struct clk_hw *hw,
 					       unsigned long parent_rate)
 {
 	struct clk_pllv3 *pll = to_clk_pllv3(hw);
 	u32 div = readl_relaxed(pll->base) & pll->div_mask;

 	return parent_rate * div / 2;
 }

 static long clk_pllv3_sys_round_rate(struct clk_hw *hw, unsigned long rate,
 				     unsigned long *prate)
 {
 	unsigned long parent_rate = *prate;
 	unsigned long min_rate = parent_rate * 54 / 2;
 	unsigned long max_rate = parent_rate * 108 / 2;
 	u32 div;

 	if (rate > max_rate)
 		rate = max_rate;
 	else if (rate < min_rate)
 		rate = min_rate;
 	div = rate * 2 / parent_rate;

 	return parent_rate * div / 2;
 }

 static int clk_pllv3_sys_set_rate(struct clk_hw *hw, unsigned long rate,
 		unsigned long parent_rate)
 {
 	struct clk_pllv3 *pll = to_clk_pllv3(hw);
 	unsigned long min_rate = parent_rate * 54 / 2;
 	unsigned long max_rate = parent_rate * 108 / 2;
 	u32 val, div;

 	if (rate < min_rate || rate > max_rate)
 		return -EINVAL;

 	div = rate * 2 / parent_rate;
 	val = readl_relaxed(pll->base);
 	val &= ~pll->div_mask;
 	val |= div;
 	writel_relaxed(val, pll->base);

 	return clk_pllv3_wait_lock(pll);
 }

 static const struct clk_ops clk_pllv3_sys_ops = {
 	.prepare	= clk_pllv3_prepare,
 	.unprepare	= clk_pllv3_unprepare,
 	.recalc_rate	= clk_pllv3_sys_recalc_rate,
 	.round_rate	= clk_pllv3_sys_round_rate,
 	.set_rate	= clk_pllv3_sys_set_rate,
 };

 static unsigned long clk_pllv3_av_recalc_rate(struct clk_hw *hw,
 					      unsigned long parent_rate)
 {
 	struct clk_pllv3 *pll = to_clk_pllv3(hw);
 	u32 mfn = readl_relaxed(pll->base + PLL_NUM_OFFSET);
 	u32 mfd = readl_relaxed(pll->base + PLL_DENOM_OFFSET);
 	u32 div = readl_relaxed(pll->base) & pll->div_mask;

 	return (parent_rate * div) + ((parent_rate / mfd) * mfn);
 }

 static long clk_pllv3_av_round_rate(struct clk_hw *hw, unsigned long rate,
 				    unsigned long *prate)
 {
 	unsigned long parent_rate = *prate;
 	unsigned long min_rate = parent_rate * 27;
 	unsigned long max_rate = parent_rate * 54;
 	u32 div;
 	u32 mfn, mfd = 1000000;
 	u64 temp64;

 	if (rate > max_rate)
 		rate = max_rate;
 	else if (rate < min_rate)
 		rate = min_rate;

 	div = rate / parent_rate;
 	temp64 = (u64) (rate - div * parent_rate);
 	temp64 *= mfd;
 	do_div(temp64, parent_rate);
 	mfn = temp64;

 	return parent_rate * div + parent_rate / mfd * mfn;
 }

 static int clk_pllv3_av_set_rate(struct clk_hw *hw, unsigned long rate,
 		unsigned long parent_rate)
 {
 	struct clk_pllv3 *pll = to_clk_pllv3(hw);
 	unsigned long min_rate = parent_rate * 27;
 	unsigned long max_rate = parent_rate * 54;
 	u32 val, div;
 	u32 mfn, mfd = 1000000;
 	u64 temp64;

 	if (rate < min_rate || rate > max_rate)
 		return -EINVAL;

 	div = rate / parent_rate;
 	temp64 = (u64) (rate - div * parent_rate);
 	temp64 *= mfd;
 	do_div(temp64, parent_rate);
 	mfn = temp64;

 	val = readl_relaxed(pll->base);
 	val &= ~pll->div_mask;
 	val |= div;
 	writel_relaxed(val, pll->base);
 	writel_relaxed(mfn, pll->base + PLL_NUM_OFFSET);
 	writel_relaxed(mfd, pll->base + PLL_DENOM_OFFSET);

 	return clk_pllv3_wait_lock(pll);
 }

 static const struct clk_ops clk_pllv3_av_ops = {
 	.prepare	= clk_pllv3_prepare,
 	.unprepare	= clk_pllv3_unprepare,
 	.recalc_rate	= clk_pllv3_av_recalc_rate,
 	.round_rate	= clk_pllv3_av_round_rate,
 	.set_rate	= clk_pllv3_av_set_rate,
 };

 static unsigned long clk_pllv3_enet_recalc_rate(struct clk_hw *hw,
 						unsigned long parent_rate)
 {
 	return 500000000;
 }

 static const struct clk_ops clk_pllv3_enet_ops = {
 	.prepare	= clk_pllv3_prepare,
 	.unprepare	= clk_pllv3_unprepare,
 	.recalc_rate	= clk_pllv3_enet_recalc_rate,
 };

 struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name,
 			  const char *parent_name, void __iomem *base,
 			  u32 div_mask)
 {
 	struct clk_pllv3 *pll;
 	const struct clk_ops *ops;
 	struct clk *clk;
 	struct clk_init_data init;

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

 	pll->powerdown = BM_PLL_POWER;

 	switch (type) {
 	case IMX_PLLV3_SYS:
 		ops = &clk_pllv3_sys_ops;
 		break;
 	case IMX_PLLV3_USB_VF610:
 		pll->div_shift = 1;
 	case IMX_PLLV3_USB:
 		ops = &clk_pllv3_ops;
 		pll->powerup_set = true;
 		break;
 	case IMX_PLLV3_AV:
 		ops = &clk_pllv3_av_ops;
 		break;
 	case IMX_PLLV3_ENET_IMX7:
 		pll->powerdown = IMX7_ENET_PLL_POWER;
 	case IMX_PLLV3_ENET:
 		ops = &clk_pllv3_enet_ops;
 		break;
 	default:
 		ops = &clk_pllv3_ops;
 	}
 	pll->base = base;
 	pll->div_mask = div_mask;

 	init.name = name;
 	init.ops = ops;
 	init.flags = 0;
 	init.parent_names = &parent_name;
 	init.num_parents = 1;

 	pll->hw.init = &init;

 	clk = clk_register(NULL, &pll->hw);
 	if (IS_ERR(clk))
 		kfree(pll);

 	return clk;
 }
	/*
	* Copyright 2012 Freescale Semiconductor, Inc.
	* Copyright 2012 Linaro Ltd.
	*
	* The code contained herein is licensed under the GNU General Public
	* License. You may obtain a copy of the GNU General Public License
	* Version 2 or later at the following locations:
	*
	* http://www.opensource.org/licenses/gpl-license.html
	* http://www.gnu.org/copyleft/gpl.html
	*/

	#include <linux/clk-provider.h>
	#include <linux/delay.h>
	#include <linux/io.h>
	#include <linux/slab.h>
	#include <linux/jiffies.h>
	#include <linux/err.h>
	#include "clk.h"

	#define PLL_NUM_OFFSET 0x10
	#define PLL_DENOM_OFFSET 0x20

	#define BM_PLL_POWER (0x1 << 12)
	#define BM_PLL_LOCK (0x1 << 31)
	#define IMX7_ENET_PLL_POWER (0x1 << 5)

	/**
	* struct clk_pllv3 - IMX PLL clock version 3
	* @clk_hw: clock source
	* @base: base address of PLL registers
	* @powerup_set: set POWER bit to power up the PLL
	* @powerdown: pll powerdown offset bit
	* @div_mask: mask of divider bits
	* @div_shift: shift of divider bits
	*
	* IMX PLL clock version 3, found on i.MX6 series. Divider for pllv3
	* is actually a multiplier, and always sits at bit 0.
	*/
	struct clk_pllv3 {
	struct clk_hw hw;
	void __iomem *base;
	bool powerup_set;
	u32 powerdown;
	u32 div_mask;
	u32 div_shift;
	};

	#define to_clk_pllv3(_hw) container_of(_hw, struct clk_pllv3, hw)

	static int clk_pllv3_wait_lock(struct clk_pllv3 *pll)
	{
	unsigned long timeout = jiffies + msecs_to_jiffies(10);
	u32 val = readl_relaxed(pll->base) & pll->powerdown;

	/* No need to wait for lock when pll is not powered up */
	if ((pll->powerup_set && !val) \|\| (!pll->powerup_set && val))
	return 0;

	/* Wait for PLL to lock */
	do {
	if (readl_relaxed(pll->base) & BM_PLL_LOCK)
	break;
	if (time_after(jiffies, timeout))
	break;
	usleep_range(50, 500);
	} while (1);

	return readl_relaxed(pll->base) & BM_PLL_LOCK ? 0 : -ETIMEDOUT;
	}

	static int clk_pllv3_prepare(struct clk_hw *hw)
	{
	struct clk_pllv3 *pll = to_clk_pllv3(hw);
	u32 val;

	val = readl_relaxed(pll->base);
	if (pll->powerup_set)
	val \|= BM_PLL_POWER;
	else
	val &= ~BM_PLL_POWER;
	writel_relaxed(val, pll->base);

	return clk_pllv3_wait_lock(pll);
	}

	static void clk_pllv3_unprepare(struct clk_hw *hw)
	{
	struct clk_pllv3 *pll = to_clk_pllv3(hw);
	u32 val;

	val = readl_relaxed(pll->base);
	if (pll->powerup_set)
	val &= ~BM_PLL_POWER;
	else
	val \|= BM_PLL_POWER;
	writel_relaxed(val, pll->base);
	}

	static unsigned long clk_pllv3_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	struct clk_pllv3 *pll = to_clk_pllv3(hw);
	u32 div = (readl_relaxed(pll->base) >> pll->div_shift) & pll->div_mask;

	return (div == 1) ? parent_rate * 22 : parent_rate * 20;
	}

	static long clk_pllv3_round_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long *prate)
	{
	unsigned long parent_rate = *prate;

	return (rate >= parent_rate * 22) ? parent_rate * 22 :
	parent_rate * 20;
	}

	static int clk_pllv3_set_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long parent_rate)
	{
	struct clk_pllv3 *pll = to_clk_pllv3(hw);
	u32 val, div;

	if (rate == parent_rate * 22)
	div = 1;
	else if (rate == parent_rate * 20)
	div = 0;
	else
	return -EINVAL;

	val = readl_relaxed(pll->base);
	val &= ~(pll->div_mask << pll->div_shift);
	val \|= (div << pll->div_shift);
	writel_relaxed(val, pll->base);

	return clk_pllv3_wait_lock(pll);
	}

	static const struct clk_ops clk_pllv3_ops = {
	.prepare = clk_pllv3_prepare,
	.unprepare = clk_pllv3_unprepare,
	.recalc_rate = clk_pllv3_recalc_rate,
	.round_rate = clk_pllv3_round_rate,
	.set_rate = clk_pllv3_set_rate,
	};

	static unsigned long clk_pllv3_sys_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	struct clk_pllv3 *pll = to_clk_pllv3(hw);
	u32 div = readl_relaxed(pll->base) & pll->div_mask;

	return parent_rate * div / 2;
	}

	static long clk_pllv3_sys_round_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long *prate)
	{
	unsigned long parent_rate = *prate;
	unsigned long min_rate = parent_rate * 54 / 2;
	unsigned long max_rate = parent_rate * 108 / 2;
	u32 div;

	if (rate > max_rate)
	rate = max_rate;
	else if (rate < min_rate)
	rate = min_rate;
	div = rate * 2 / parent_rate;

	return parent_rate * div / 2;
	}

	static int clk_pllv3_sys_set_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long parent_rate)
	{
	struct clk_pllv3 *pll = to_clk_pllv3(hw);
	unsigned long min_rate = parent_rate * 54 / 2;
	unsigned long max_rate = parent_rate * 108 / 2;
	u32 val, div;

	if (rate < min_rate \|\| rate > max_rate)
	return -EINVAL;

	div = rate * 2 / parent_rate;
	val = readl_relaxed(pll->base);
	val &= ~pll->div_mask;
	val \|= div;
	writel_relaxed(val, pll->base);

	return clk_pllv3_wait_lock(pll);
	}

	static const struct clk_ops clk_pllv3_sys_ops = {
	.prepare = clk_pllv3_prepare,
	.unprepare = clk_pllv3_unprepare,
	.recalc_rate = clk_pllv3_sys_recalc_rate,
	.round_rate = clk_pllv3_sys_round_rate,
	.set_rate = clk_pllv3_sys_set_rate,
	};

	static unsigned long clk_pllv3_av_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	struct clk_pllv3 *pll = to_clk_pllv3(hw);
	u32 mfn = readl_relaxed(pll->base + PLL_NUM_OFFSET);
	u32 mfd = readl_relaxed(pll->base + PLL_DENOM_OFFSET);
	u32 div = readl_relaxed(pll->base) & pll->div_mask;

	return (parent_rate * div) + ((parent_rate / mfd) * mfn);
	}

	static long clk_pllv3_av_round_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long *prate)
	{
	unsigned long parent_rate = *prate;
	unsigned long min_rate = parent_rate * 27;
	unsigned long max_rate = parent_rate * 54;
	u32 div;
	u32 mfn, mfd = 1000000;
	u64 temp64;

	if (rate > max_rate)
	rate = max_rate;
	else if (rate < min_rate)
	rate = min_rate;

	div = rate / parent_rate;
	temp64 = (u64) (rate - div * parent_rate);
	temp64 *= mfd;
	do_div(temp64, parent_rate);
	mfn = temp64;

	return parent_rate * div + parent_rate / mfd * mfn;
	}

	static int clk_pllv3_av_set_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long parent_rate)
	{
	struct clk_pllv3 *pll = to_clk_pllv3(hw);
	unsigned long min_rate = parent_rate * 27;
	unsigned long max_rate = parent_rate * 54;
	u32 val, div;
	u32 mfn, mfd = 1000000;
	u64 temp64;

	if (rate < min_rate \|\| rate > max_rate)
	return -EINVAL;

	div = rate / parent_rate;
	temp64 = (u64) (rate - div * parent_rate);
	temp64 *= mfd;
	do_div(temp64, parent_rate);
	mfn = temp64;

	val = readl_relaxed(pll->base);
	val &= ~pll->div_mask;
	val \|= div;
	writel_relaxed(val, pll->base);
	writel_relaxed(mfn, pll->base + PLL_NUM_OFFSET);
	writel_relaxed(mfd, pll->base + PLL_DENOM_OFFSET);

	return clk_pllv3_wait_lock(pll);
	}

	static const struct clk_ops clk_pllv3_av_ops = {
	.prepare = clk_pllv3_prepare,
	.unprepare = clk_pllv3_unprepare,
	.recalc_rate = clk_pllv3_av_recalc_rate,
	.round_rate = clk_pllv3_av_round_rate,
	.set_rate = clk_pllv3_av_set_rate,
	};

	static unsigned long clk_pllv3_enet_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return 500000000;
	}

	static const struct clk_ops clk_pllv3_enet_ops = {
	.prepare = clk_pllv3_prepare,
	.unprepare = clk_pllv3_unprepare,
	.recalc_rate = clk_pllv3_enet_recalc_rate,
	};

	struct clk imx_clk_pllv3(enum imx_pllv3_type type, const char name,
	const char parent_name, void __iomem base,
	u32 div_mask)
	{
	struct clk_pllv3 *pll;
	const struct clk_ops *ops;
	struct clk *clk;
	struct clk_init_data init;

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

	pll->powerdown = BM_PLL_POWER;

	switch (type) {
	case IMX_PLLV3_SYS:
	ops = &clk_pllv3_sys_ops;
	break;
	case IMX_PLLV3_USB_VF610:
	pll->div_shift = 1;
	case IMX_PLLV3_USB:
	ops = &clk_pllv3_ops;
	pll->powerup_set = true;
	break;
	case IMX_PLLV3_AV:
	ops = &clk_pllv3_av_ops;
	break;
	case IMX_PLLV3_ENET_IMX7:
	pll->powerdown = IMX7_ENET_PLL_POWER;
	case IMX_PLLV3_ENET:
	ops = &clk_pllv3_enet_ops;
	break;
	default:
	ops = &clk_pllv3_ops;
	}
	pll->base = base;
	pll->div_mask = div_mask;

	init.name = name;
	init.ops = ops;
	init.flags = 0;
	init.parent_names = &parent_name;
	init.num_parents = 1;

	pll->hw.init = &init;

	clk = clk_register(NULL, &pll->hw);
	if (IS_ERR(clk))
	kfree(pll);

	return clk;
	}