drivers/clk/keystone/pll.c - linux - Git at Google

 /*
  * PLL clock driver for Keystone devices
  *
  * Copyright (C) 2013 Texas Instruments Inc.
  *	Murali Karicheri <m-karicheri2@ti.com>
  *	Santosh Shilimkar <santosh.shilimkar@ti.com>
  *
  * 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.
  */
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/of_address.h>
 #include <linux/of.h>
 #include <linux/module.h>

 #define PLLM_LOW_MASK		0x3f
 #define PLLM_HIGH_MASK		0x7ffc0
 #define MAIN_PLLM_HIGH_MASK	0x7f000
 #define PLLM_HIGH_SHIFT		6
 #define PLLD_MASK		0x3f

 /**
  * struct clk_pll_data - pll data structure
  * @has_pllctrl: If set to non zero, lower 6 bits of multiplier is in pllm
  *	register of pll controller, else it is in the pll_ctrl0((bit 11-6)
  * @phy_pllm: Physical address of PLLM in pll controller. Used when
  *	has_pllctrl is non zero.
  * @phy_pll_ctl0: Physical address of PLL ctrl0. This could be that of
  *	Main PLL or any other PLLs in the device such as ARM PLL, DDR PLL
  *	or PA PLL available on keystone2. These PLLs are controlled by
  *	this register. Main PLL is controlled by a PLL controller.
  * @pllm: PLL register map address
  * @pll_ctl0: PLL controller map address
  * @pllm_lower_mask: multiplier lower mask
  * @pllm_upper_mask: multiplier upper mask
  * @pllm_upper_shift: multiplier upper shift
  * @plld_mask: divider mask
  * @postdiv: Post divider
  */
 struct clk_pll_data {
 	bool has_pllctrl;
 	u32 phy_pllm;
 	u32 phy_pll_ctl0;
 	void __iomem *pllm;
 	void __iomem *pll_ctl0;
 	u32 pllm_lower_mask;
 	u32 pllm_upper_mask;
 	u32 pllm_upper_shift;
 	u32 plld_mask;
 	u32 postdiv;
 };

 /**
  * struct clk_pll - Main pll clock
  * @hw: clk_hw for the pll
  * @pll_data: PLL driver specific data
  */
 struct clk_pll {
 	struct clk_hw hw;
 	struct clk_pll_data *pll_data;
 };

 #define to_clk_pll(_hw) container_of(_hw, struct clk_pll, hw)

 static unsigned long clk_pllclk_recalc(struct clk_hw *hw,
 					unsigned long parent_rate)
 {
 	struct clk_pll *pll = to_clk_pll(hw);
 	struct clk_pll_data *pll_data = pll->pll_data;
 	unsigned long rate = parent_rate;
 	u32  mult = 0, prediv, postdiv, val;

 	/*
 	 * get bits 0-5 of multiplier from pllctrl PLLM register
 	 * if has_pllctrl is non zero
 	 */
 	if (pll_data->has_pllctrl) {
 		val = readl(pll_data->pllm);
 		mult = (val & pll_data->pllm_lower_mask);
 	}

 	/* bit6-12 of PLLM is in Main PLL control register */
 	val = readl(pll_data->pll_ctl0);
 	mult |= ((val & pll_data->pllm_upper_mask)
 			>> pll_data->pllm_upper_shift);
 	prediv = (val & pll_data->plld_mask);
 	postdiv = pll_data->postdiv;

 	rate /= (prediv + 1);
 	rate = (rate * (mult + 1));
 	rate /= postdiv;

 	return rate;
 }

 static const struct clk_ops clk_pll_ops = {
 	.recalc_rate = clk_pllclk_recalc,
 };

 static struct clk *clk_register_pll(struct device *dev,
 			const char *name,
 			const char *parent_name,
 			struct clk_pll_data *pll_data)
 {
 	struct clk_init_data init;
 	struct clk_pll *pll;
 	struct clk *clk;

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

 	init.name = name;
 	init.ops = &clk_pll_ops;
 	init.flags = 0;
 	init.parent_names = (parent_name ? &parent_name : NULL);
 	init.num_parents = (parent_name ? 1 : 0);

 	pll->pll_data	= pll_data;
 	pll->hw.init = &init;

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

 	return clk;
 out:
 	kfree(pll);
 	return NULL;
 }

 /**
  * _of_clk_init - PLL initialisation via DT
  * @node: device tree node for this clock
  * @pllctrl: If true, lower 6 bits of multiplier is in pllm register of
  *		pll controller, else it is in the control regsiter0(bit 11-6)
  */
 static void __init _of_pll_clk_init(struct device_node *node, bool pllctrl)
 {
 	struct clk_pll_data *pll_data;
 	const char *parent_name;
 	struct clk *clk;
 	int i;

 	pll_data = kzalloc(sizeof(*pll_data), GFP_KERNEL);
 	if (!pll_data) {
 		pr_err("%s: Out of memory\n", __func__);
 		return;
 	}

 	parent_name = of_clk_get_parent_name(node, 0);
 	if (of_property_read_u32(node, "fixed-postdiv",	&pll_data->postdiv))
 		goto out;

 	i = of_property_match_string(node, "reg-names", "control");
 	pll_data->pll_ctl0 = of_iomap(node, i);
 	if (!pll_data->pll_ctl0) {
 		pr_err("%s: ioremap failed\n", __func__);
 		goto out;
 	}

 	pll_data->pllm_lower_mask = PLLM_LOW_MASK;
 	pll_data->pllm_upper_shift = PLLM_HIGH_SHIFT;
 	pll_data->plld_mask = PLLD_MASK;
 	pll_data->has_pllctrl = pllctrl;
 	if (!pll_data->has_pllctrl) {
 		pll_data->pllm_upper_mask = PLLM_HIGH_MASK;
 	} else {
 		pll_data->pllm_upper_mask = MAIN_PLLM_HIGH_MASK;
 		i = of_property_match_string(node, "reg-names", "multiplier");
 		pll_data->pllm = of_iomap(node, i);
 		if (!pll_data->pllm) {
 			iounmap(pll_data->pll_ctl0);
 			goto out;
 		}
 	}

 	clk = clk_register_pll(NULL, node->name, parent_name, pll_data);
 	if (clk) {
 		of_clk_add_provider(node, of_clk_src_simple_get, clk);
 		return;
 	}

 out:
 	pr_err("%s: error initializing pll %s\n", __func__, node->name);
 	kfree(pll_data);
 }

 /**
  * of_keystone_pll_clk_init - PLL initialisation DT wrapper
  * @node: device tree node for this clock
  */
 static void __init of_keystone_pll_clk_init(struct device_node *node)
 {
 	_of_pll_clk_init(node, false);
 }
 CLK_OF_DECLARE(keystone_pll_clock, "ti,keystone,pll-clock",
 					of_keystone_pll_clk_init);

 /**
  * of_keystone_pll_main_clk_init - Main PLL initialisation DT wrapper
  * @node: device tree node for this clock
  */
 static void __init of_keystone_main_pll_clk_init(struct device_node *node)
 {
 	_of_pll_clk_init(node, true);
 }
 CLK_OF_DECLARE(keystone_main_pll_clock, "ti,keystone,main-pll-clock",
 						of_keystone_main_pll_clk_init);

 /**
  * of_pll_div_clk_init - PLL divider setup function
  * @node: device tree node for this clock
  */
 static void __init of_pll_div_clk_init(struct device_node *node)
 {
 	const char *parent_name;
 	void __iomem *reg;
 	u32 shift, mask;
 	struct clk *clk;
 	const char *clk_name = node->name;

 	of_property_read_string(node, "clock-output-names", &clk_name);
 	reg = of_iomap(node, 0);
 	if (!reg) {
 		pr_err("%s: ioremap failed\n", __func__);
 		return;
 	}

 	parent_name = of_clk_get_parent_name(node, 0);
 	if (!parent_name) {
 		pr_err("%s: missing parent clock\n", __func__);
 		return;
 	}

 	if (of_property_read_u32(node, "bit-shift", &shift)) {
 		pr_err("%s: missing 'shift' property\n", __func__);
 		return;
 	}

 	if (of_property_read_u32(node, "bit-mask", &mask)) {
 		pr_err("%s: missing 'bit-mask' property\n", __func__);
 		return;
 	}

 	clk = clk_register_divider(NULL, clk_name, parent_name, 0, reg, shift,
 				 mask, 0, NULL);
 	if (clk)
 		of_clk_add_provider(node, of_clk_src_simple_get, clk);
 	else
 		pr_err("%s: error registering divider %s\n", __func__, clk_name);
 }
 CLK_OF_DECLARE(pll_divider_clock, "ti,keystone,pll-divider-clock", of_pll_div_clk_init);

 /**
  * of_pll_mux_clk_init - PLL mux setup function
  * @node: device tree node for this clock
  */
 static void __init of_pll_mux_clk_init(struct device_node *node)
 {
 	void __iomem *reg;
 	u32 shift, mask;
 	struct clk *clk;
 	const char *parents[2];
 	const char *clk_name = node->name;

 	of_property_read_string(node, "clock-output-names", &clk_name);
 	reg = of_iomap(node, 0);
 	if (!reg) {
 		pr_err("%s: ioremap failed\n", __func__);
 		return;
 	}

 	parents[0] = of_clk_get_parent_name(node, 0);
 	parents[1] = of_clk_get_parent_name(node, 1);
 	if (!parents[0] || !parents[1]) {
 		pr_err("%s: missing parent clocks\n", __func__);
 		return;
 	}

 	if (of_property_read_u32(node, "bit-shift", &shift)) {
 		pr_err("%s: missing 'shift' property\n", __func__);
 		return;
 	}

 	if (of_property_read_u32(node, "bit-mask", &mask)) {
 		pr_err("%s: missing 'bit-mask' property\n", __func__);
 		return;
 	}

 	clk = clk_register_mux(NULL, clk_name, (const char **)&parents,
 				ARRAY_SIZE(parents) , 0, reg, shift, mask,
 				0, NULL);
 	if (clk)
 		of_clk_add_provider(node, of_clk_src_simple_get, clk);
 	else
 		pr_err("%s: error registering mux %s\n", __func__, clk_name);
 }
 CLK_OF_DECLARE(pll_mux_clock, "ti,keystone,pll-mux-clock", of_pll_mux_clk_init);
	/*
	* PLL clock driver for Keystone devices
	*
	* Copyright (C) 2013 Texas Instruments Inc.
	* Murali Karicheri <m-karicheri2@ti.com>
	* Santosh Shilimkar <santosh.shilimkar@ti.com>
	*
	* 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.
	*/
	#include <linux/clk.h>
	#include <linux/clk-provider.h>
	#include <linux/err.h>
	#include <linux/io.h>
	#include <linux/slab.h>
	#include <linux/of_address.h>
	#include <linux/of.h>
	#include <linux/module.h>

	#define PLLM_LOW_MASK 0x3f
	#define PLLM_HIGH_MASK 0x7ffc0
	#define MAIN_PLLM_HIGH_MASK 0x7f000
	#define PLLM_HIGH_SHIFT 6
	#define PLLD_MASK 0x3f

	/**
	* struct clk_pll_data - pll data structure
	* @has_pllctrl: If set to non zero, lower 6 bits of multiplier is in pllm
	* register of pll controller, else it is in the pll_ctrl0((bit 11-6)
	* @phy_pllm: Physical address of PLLM in pll controller. Used when
	* has_pllctrl is non zero.
	* @phy_pll_ctl0: Physical address of PLL ctrl0. This could be that of
	* Main PLL or any other PLLs in the device such as ARM PLL, DDR PLL
	* or PA PLL available on keystone2. These PLLs are controlled by
	* this register. Main PLL is controlled by a PLL controller.
	* @pllm: PLL register map address
	* @pll_ctl0: PLL controller map address
	* @pllm_lower_mask: multiplier lower mask
	* @pllm_upper_mask: multiplier upper mask
	* @pllm_upper_shift: multiplier upper shift
	* @plld_mask: divider mask
	* @postdiv: Post divider
	*/
	struct clk_pll_data {
	bool has_pllctrl;
	u32 phy_pllm;
	u32 phy_pll_ctl0;
	void __iomem *pllm;
	void __iomem *pll_ctl0;
	u32 pllm_lower_mask;
	u32 pllm_upper_mask;
	u32 pllm_upper_shift;
	u32 plld_mask;
	u32 postdiv;
	};

	/**
	* struct clk_pll - Main pll clock
	* @hw: clk_hw for the pll
	* @pll_data: PLL driver specific data
	*/
	struct clk_pll {
	struct clk_hw hw;
	struct clk_pll_data *pll_data;
	};

	#define to_clk_pll(_hw) container_of(_hw, struct clk_pll, hw)

	static unsigned long clk_pllclk_recalc(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	struct clk_pll *pll = to_clk_pll(hw);
	struct clk_pll_data *pll_data = pll->pll_data;
	unsigned long rate = parent_rate;
	u32 mult = 0, prediv, postdiv, val;

	/*
	* get bits 0-5 of multiplier from pllctrl PLLM register
	* if has_pllctrl is non zero
	*/
	if (pll_data->has_pllctrl) {
	val = readl(pll_data->pllm);
	mult = (val & pll_data->pllm_lower_mask);
	}

	/* bit6-12 of PLLM is in Main PLL control register */
	val = readl(pll_data->pll_ctl0);
	mult \|= ((val & pll_data->pllm_upper_mask)
	>> pll_data->pllm_upper_shift);
	prediv = (val & pll_data->plld_mask);
	postdiv = pll_data->postdiv;

	rate /= (prediv + 1);
	rate = (rate * (mult + 1));
	rate /= postdiv;

	return rate;
	}

	static const struct clk_ops clk_pll_ops = {
	.recalc_rate = clk_pllclk_recalc,
	};

	static struct clk clk_register_pll(struct device dev,
	const char *name,
	const char *parent_name,
	struct clk_pll_data *pll_data)
	{
	struct clk_init_data init;
	struct clk_pll *pll;
	struct clk *clk;

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

	init.name = name;
	init.ops = &clk_pll_ops;
	init.flags = 0;
	init.parent_names = (parent_name ? &parent_name : NULL);
	init.num_parents = (parent_name ? 1 : 0);

	pll->pll_data = pll_data;
	pll->hw.init = &init;

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

	return clk;
	out:
	kfree(pll);
	return NULL;
	}

	/**
	* _of_clk_init - PLL initialisation via DT
	* @node: device tree node for this clock
	* @pllctrl: If true, lower 6 bits of multiplier is in pllm register of
	* pll controller, else it is in the control regsiter0(bit 11-6)
	*/
	static void __init _of_pll_clk_init(struct device_node *node, bool pllctrl)
	{
	struct clk_pll_data *pll_data;
	const char *parent_name;
	struct clk *clk;
	int i;

	pll_data = kzalloc(sizeof(*pll_data), GFP_KERNEL);
	if (!pll_data) {
	pr_err("%s: Out of memory\n", __func__);
	return;
	}

	parent_name = of_clk_get_parent_name(node, 0);
	if (of_property_read_u32(node, "fixed-postdiv", &pll_data->postdiv))
	goto out;

	i = of_property_match_string(node, "reg-names", "control");
	pll_data->pll_ctl0 = of_iomap(node, i);
	if (!pll_data->pll_ctl0) {
	pr_err("%s: ioremap failed\n", __func__);
	goto out;
	}

	pll_data->pllm_lower_mask = PLLM_LOW_MASK;
	pll_data->pllm_upper_shift = PLLM_HIGH_SHIFT;
	pll_data->plld_mask = PLLD_MASK;
	pll_data->has_pllctrl = pllctrl;
	if (!pll_data->has_pllctrl) {
	pll_data->pllm_upper_mask = PLLM_HIGH_MASK;
	} else {
	pll_data->pllm_upper_mask = MAIN_PLLM_HIGH_MASK;
	i = of_property_match_string(node, "reg-names", "multiplier");
	pll_data->pllm = of_iomap(node, i);
	if (!pll_data->pllm) {
	iounmap(pll_data->pll_ctl0);
	goto out;
	}
	}

	clk = clk_register_pll(NULL, node->name, parent_name, pll_data);
	if (clk) {
	of_clk_add_provider(node, of_clk_src_simple_get, clk);
	return;
	}

	out:
	pr_err("%s: error initializing pll %s\n", __func__, node->name);
	kfree(pll_data);
	}

	/**
	* of_keystone_pll_clk_init - PLL initialisation DT wrapper
	* @node: device tree node for this clock
	*/
	static void __init of_keystone_pll_clk_init(struct device_node *node)
	{
	_of_pll_clk_init(node, false);
	}
	CLK_OF_DECLARE(keystone_pll_clock, "ti,keystone,pll-clock",
	of_keystone_pll_clk_init);

	/**
	* of_keystone_pll_main_clk_init - Main PLL initialisation DT wrapper
	* @node: device tree node for this clock
	*/
	static void __init of_keystone_main_pll_clk_init(struct device_node *node)
	{
	_of_pll_clk_init(node, true);
	}
	CLK_OF_DECLARE(keystone_main_pll_clock, "ti,keystone,main-pll-clock",
	of_keystone_main_pll_clk_init);

	/**
	* of_pll_div_clk_init - PLL divider setup function
	* @node: device tree node for this clock
	*/
	static void __init of_pll_div_clk_init(struct device_node *node)
	{
	const char *parent_name;
	void __iomem *reg;
	u32 shift, mask;
	struct clk *clk;
	const char *clk_name = node->name;

	of_property_read_string(node, "clock-output-names", &clk_name);
	reg = of_iomap(node, 0);
	if (!reg) {
	pr_err("%s: ioremap failed\n", __func__);
	return;
	}

	parent_name = of_clk_get_parent_name(node, 0);
	if (!parent_name) {
	pr_err("%s: missing parent clock\n", __func__);
	return;
	}

	if (of_property_read_u32(node, "bit-shift", &shift)) {
	pr_err("%s: missing 'shift' property\n", __func__);
	return;
	}

	if (of_property_read_u32(node, "bit-mask", &mask)) {
	pr_err("%s: missing 'bit-mask' property\n", __func__);
	return;
	}

	clk = clk_register_divider(NULL, clk_name, parent_name, 0, reg, shift,
	mask, 0, NULL);
	if (clk)
	of_clk_add_provider(node, of_clk_src_simple_get, clk);
	else
	pr_err("%s: error registering divider %s\n", __func__, clk_name);
	}
	CLK_OF_DECLARE(pll_divider_clock, "ti,keystone,pll-divider-clock", of_pll_div_clk_init);

	/**
	* of_pll_mux_clk_init - PLL mux setup function
	* @node: device tree node for this clock
	*/
	static void __init of_pll_mux_clk_init(struct device_node *node)
	{
	void __iomem *reg;
	u32 shift, mask;
	struct clk *clk;
	const char *parents[2];
	const char *clk_name = node->name;

	of_property_read_string(node, "clock-output-names", &clk_name);
	reg = of_iomap(node, 0);
	if (!reg) {
	pr_err("%s: ioremap failed\n", __func__);
	return;
	}

	parents[0] = of_clk_get_parent_name(node, 0);
	parents[1] = of_clk_get_parent_name(node, 1);
	if (!parents[0] \|\| !parents[1]) {
	pr_err("%s: missing parent clocks\n", __func__);
	return;
	}

	if (of_property_read_u32(node, "bit-shift", &shift)) {
	pr_err("%s: missing 'shift' property\n", __func__);
	return;
	}

	if (of_property_read_u32(node, "bit-mask", &mask)) {
	pr_err("%s: missing 'bit-mask' property\n", __func__);
	return;
	}

	clk = clk_register_mux(NULL, clk_name, (const char **)&parents,
	ARRAY_SIZE(parents) , 0, reg, shift, mask,
	0, NULL);
	if (clk)
	of_clk_add_provider(node, of_clk_src_simple_get, clk);
	else
	pr_err("%s: error registering mux %s\n", __func__, clk_name);
	}
	CLK_OF_DECLARE(pll_mux_clock, "ti,keystone,pll-mux-clock", of_pll_mux_clk_init);