drivers/clk/qcom/common.c - third_party/linux - Git at Google

 /*
  * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * 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 <linux/export.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
 #include <linux/platform_device.h>
 #include <linux/clk-provider.h>
 #include <linux/reset-controller.h>
 #include <linux/of.h>

 #include "common.h"
 #include "clk-rcg.h"
 #include "clk-regmap.h"
 #include "reset.h"
 #include "gdsc.h"

 struct qcom_cc {
 	struct qcom_reset_controller reset;
 	struct clk_regmap **rclks;
 	size_t num_rclks;
 };

 const
 struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
 {
 	if (!f)
 		return NULL;

 	for (; f->freq; f++)
 		if (rate <= f->freq)
 			return f;

 	/* Default to our fastest rate */
 	return f - 1;
 }
 EXPORT_SYMBOL_GPL(qcom_find_freq);

 const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
 					    unsigned long rate)
 {
 	const struct freq_tbl *best = NULL;

 	for ( ; f->freq; f++) {
 		if (rate >= f->freq)
 			best = f;
 		else
 			break;
 	}

 	return best;
 }
 EXPORT_SYMBOL_GPL(qcom_find_freq_floor);

 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
 {
 	int i, num_parents = clk_hw_get_num_parents(hw);

 	for (i = 0; i < num_parents; i++)
 		if (src == map[i].src)
 			return i;

 	return -ENOENT;
 }
 EXPORT_SYMBOL_GPL(qcom_find_src_index);

 struct regmap *
 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
 {
 	void __iomem *base;
 	struct resource *res;
 	struct device *dev = &pdev->dev;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base))
 		return ERR_CAST(base);

 	return devm_regmap_init_mmio(dev, base, desc->config);
 }
 EXPORT_SYMBOL_GPL(qcom_cc_map);

 void
 qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count)
 {
 	u32 val;
 	u32 mask;

 	/* De-assert reset to FSM */
 	regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0);

 	/* Program bias count and lock count */
 	val = bias_count << PLL_BIAS_COUNT_SHIFT |
 		lock_count << PLL_LOCK_COUNT_SHIFT;
 	mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT;
 	mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT;
 	regmap_update_bits(map, reg, mask, val);

 	/* Enable PLL FSM voting */
 	regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA);
 }
 EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode);

 static void qcom_cc_gdsc_unregister(void *data)
 {
 	gdsc_unregister(data);
 }

 /*
  * Backwards compatibility with old DTs. Register a pass-through factor 1/1
  * clock to translate 'path' clk into 'name' clk and register the 'path'
  * clk as a fixed rate clock if it isn't present.
  */
 static int _qcom_cc_register_board_clk(struct device *dev, const char *path,
 				       const char *name, unsigned long rate,
 				       bool add_factor)
 {
 	struct device_node *node = NULL;
 	struct device_node *clocks_node;
 	struct clk_fixed_factor *factor;
 	struct clk_fixed_rate *fixed;
 	struct clk_init_data init_data = { };
 	int ret;

 	clocks_node = of_find_node_by_path("/clocks");
 	if (clocks_node) {
 		node = of_get_child_by_name(clocks_node, path);
 		of_node_put(clocks_node);
 	}

 	if (!node) {
 		fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL);
 		if (!fixed)
 			return -EINVAL;

 		fixed->fixed_rate = rate;
 		fixed->hw.init = &init_data;

 		init_data.name = path;
 		init_data.ops = &clk_fixed_rate_ops;

 		ret = devm_clk_hw_register(dev, &fixed->hw);
 		if (ret)
 			return ret;
 	}
 	of_node_put(node);

 	if (add_factor) {
 		factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL);
 		if (!factor)
 			return -EINVAL;

 		factor->mult = factor->div = 1;
 		factor->hw.init = &init_data;

 		init_data.name = name;
 		init_data.parent_names = &path;
 		init_data.num_parents = 1;
 		init_data.flags = 0;
 		init_data.ops = &clk_fixed_factor_ops;

 		ret = devm_clk_hw_register(dev, &factor->hw);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 int qcom_cc_register_board_clk(struct device *dev, const char *path,
 			       const char *name, unsigned long rate)
 {
 	bool add_factor = true;

 	/*
 	 * TODO: The RPM clock driver currently does not support the xo clock.
 	 * When xo is added to the RPM clock driver, we should change this
 	 * function to skip registration of xo factor clocks.
 	 */

 	return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
 }
 EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);

 int qcom_cc_register_sleep_clk(struct device *dev)
 {
 	return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src",
 					   32768, true);
 }
 EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);

 static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec,
 					 void *data)
 {
 	struct qcom_cc *cc = data;
 	unsigned int idx = clkspec->args[0];

 	if (idx >= cc->num_rclks) {
 		pr_err("%s: invalid index %u\n", __func__, idx);
 		return ERR_PTR(-EINVAL);
 	}

 	return cc->rclks[idx] ? &cc->rclks[idx]->hw : ERR_PTR(-ENOENT);
 }

 int qcom_cc_really_probe(struct platform_device *pdev,
 			 const struct qcom_cc_desc *desc, struct regmap *regmap)
 {
 	int i, ret;
 	struct device *dev = &pdev->dev;
 	struct qcom_reset_controller *reset;
 	struct qcom_cc *cc;
 	struct gdsc_desc *scd;
 	size_t num_clks = desc->num_clks;
 	struct clk_regmap **rclks = desc->clks;

 	cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
 	if (!cc)
 		return -ENOMEM;

 	reset = &cc->reset;
 	reset->rcdev.of_node = dev->of_node;
 	reset->rcdev.ops = &qcom_reset_ops;
 	reset->rcdev.owner = dev->driver->owner;
 	reset->rcdev.nr_resets = desc->num_resets;
 	reset->regmap = regmap;
 	reset->reset_map = desc->resets;

 	ret = devm_reset_controller_register(dev, &reset->rcdev);
 	if (ret)
 		return ret;

 	if (desc->gdscs && desc->num_gdscs) {
 		scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL);
 		if (!scd)
 			return -ENOMEM;
 		scd->dev = dev;
 		scd->scs = desc->gdscs;
 		scd->num = desc->num_gdscs;
 		ret = gdsc_register(scd, &reset->rcdev, regmap);
 		if (ret)
 			return ret;
 		ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister,
 					       scd);
 		if (ret)
 			return ret;
 	}

 	cc->rclks = rclks;
 	cc->num_rclks = num_clks;

 	for (i = 0; i < num_clks; i++) {
 		if (!rclks[i])
 			continue;

 		ret = devm_clk_register_regmap(dev, rclks[i]);
 		if (ret)
 			return ret;
 	}

 	ret = devm_of_clk_add_hw_provider(dev, qcom_cc_clk_hw_get, cc);
 	if (ret)
 		return ret;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);

 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
 {
 	struct regmap *regmap;

 	regmap = qcom_cc_map(pdev, desc);
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);

 	return qcom_cc_really_probe(pdev, desc, regmap);
 }
 EXPORT_SYMBOL_GPL(qcom_cc_probe);

 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* 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 <linux/export.h>
	#include <linux/module.h>
	#include <linux/regmap.h>
	#include <linux/platform_device.h>
	#include <linux/clk-provider.h>
	#include <linux/reset-controller.h>
	#include <linux/of.h>

	#include "common.h"
	#include "clk-rcg.h"
	#include "clk-regmap.h"
	#include "reset.h"
	#include "gdsc.h"

	struct qcom_cc {
	struct qcom_reset_controller reset;
	struct clk_regmap **rclks;
	size_t num_rclks;
	};

	const
	struct freq_tbl qcom_find_freq(const struct freq_tbl f, unsigned long rate)
	{
	if (!f)
	return NULL;

	for (; f->freq; f++)
	if (rate <= f->freq)
	return f;

	/* Default to our fastest rate */
	return f - 1;
	}
	EXPORT_SYMBOL_GPL(qcom_find_freq);

	const struct freq_tbl qcom_find_freq_floor(const struct freq_tbl f,
	unsigned long rate)
	{
	const struct freq_tbl *best = NULL;

	for ( ; f->freq; f++) {
	if (rate >= f->freq)
	best = f;
	else
	break;
	}

	return best;
	}
	EXPORT_SYMBOL_GPL(qcom_find_freq_floor);

	int qcom_find_src_index(struct clk_hw hw, const struct parent_map map, u8 src)
	{
	int i, num_parents = clk_hw_get_num_parents(hw);

	for (i = 0; i < num_parents; i++)
	if (src == map[i].src)
	return i;

	return -ENOENT;
	}
	EXPORT_SYMBOL_GPL(qcom_find_src_index);

	struct regmap *
	qcom_cc_map(struct platform_device pdev, const struct qcom_cc_desc desc)
	{
	void __iomem *base;
	struct resource *res;
	struct device *dev = &pdev->dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base))
	return ERR_CAST(base);

	return devm_regmap_init_mmio(dev, base, desc->config);
	}
	EXPORT_SYMBOL_GPL(qcom_cc_map);

	void
	qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count)
	{
	u32 val;
	u32 mask;

	/* De-assert reset to FSM */
	regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0);

	/* Program bias count and lock count */
	val = bias_count << PLL_BIAS_COUNT_SHIFT \|
	lock_count << PLL_LOCK_COUNT_SHIFT;
	mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT;
	mask \|= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT;
	regmap_update_bits(map, reg, mask, val);

	/* Enable PLL FSM voting */
	regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA);
	}
	EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode);

	static void qcom_cc_gdsc_unregister(void *data)
	{
	gdsc_unregister(data);
	}

	/*
	* Backwards compatibility with old DTs. Register a pass-through factor 1/1
	* clock to translate 'path' clk into 'name' clk and register the 'path'
	* clk as a fixed rate clock if it isn't present.
	*/
	static int _qcom_cc_register_board_clk(struct device dev, const char path,
	const char *name, unsigned long rate,
	bool add_factor)
	{
	struct device_node *node = NULL;
	struct device_node *clocks_node;
	struct clk_fixed_factor *factor;
	struct clk_fixed_rate *fixed;
	struct clk_init_data init_data = { };
	int ret;

	clocks_node = of_find_node_by_path("/clocks");
	if (clocks_node) {
	node = of_get_child_by_name(clocks_node, path);
	of_node_put(clocks_node);
	}

	if (!node) {
	fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL);
	if (!fixed)
	return -EINVAL;

	fixed->fixed_rate = rate;
	fixed->hw.init = &init_data;

	init_data.name = path;
	init_data.ops = &clk_fixed_rate_ops;

	ret = devm_clk_hw_register(dev, &fixed->hw);
	if (ret)
	return ret;
	}
	of_node_put(node);

	if (add_factor) {
	factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL);
	if (!factor)
	return -EINVAL;

	factor->mult = factor->div = 1;
	factor->hw.init = &init_data;

	init_data.name = name;
	init_data.parent_names = &path;
	init_data.num_parents = 1;
	init_data.flags = 0;
	init_data.ops = &clk_fixed_factor_ops;

	ret = devm_clk_hw_register(dev, &factor->hw);
	if (ret)
	return ret;
	}

	return 0;
	}

	int qcom_cc_register_board_clk(struct device dev, const char path,
	const char *name, unsigned long rate)
	{
	bool add_factor = true;

	/*
	* TODO: The RPM clock driver currently does not support the xo clock.
	* When xo is added to the RPM clock driver, we should change this
	* function to skip registration of xo factor clocks.
	*/

	return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
	}
	EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);

	int qcom_cc_register_sleep_clk(struct device *dev)
	{
	return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src",
	32768, true);
	}
	EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);

	static struct clk_hw qcom_cc_clk_hw_get(struct of_phandle_args clkspec,
	void *data)
	{
	struct qcom_cc *cc = data;
	unsigned int idx = clkspec->args[0];

	if (idx >= cc->num_rclks) {
	pr_err("%s: invalid index %u\n", __func__, idx);
	return ERR_PTR(-EINVAL);
	}

	return cc->rclks[idx] ? &cc->rclks[idx]->hw : ERR_PTR(-ENOENT);
	}

	int qcom_cc_really_probe(struct platform_device *pdev,
	const struct qcom_cc_desc desc, struct regmap regmap)
	{
	int i, ret;
	struct device *dev = &pdev->dev;
	struct qcom_reset_controller *reset;
	struct qcom_cc *cc;
	struct gdsc_desc *scd;
	size_t num_clks = desc->num_clks;
	struct clk_regmap **rclks = desc->clks;

	cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
	if (!cc)
	return -ENOMEM;

	reset = &cc->reset;
	reset->rcdev.of_node = dev->of_node;
	reset->rcdev.ops = &qcom_reset_ops;
	reset->rcdev.owner = dev->driver->owner;
	reset->rcdev.nr_resets = desc->num_resets;
	reset->regmap = regmap;
	reset->reset_map = desc->resets;

	ret = devm_reset_controller_register(dev, &reset->rcdev);
	if (ret)
	return ret;

	if (desc->gdscs && desc->num_gdscs) {
	scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL);
	if (!scd)
	return -ENOMEM;
	scd->dev = dev;
	scd->scs = desc->gdscs;
	scd->num = desc->num_gdscs;
	ret = gdsc_register(scd, &reset->rcdev, regmap);
	if (ret)
	return ret;
	ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister,
	scd);
	if (ret)
	return ret;
	}

	cc->rclks = rclks;
	cc->num_rclks = num_clks;

	for (i = 0; i < num_clks; i++) {
	if (!rclks[i])
	continue;

	ret = devm_clk_register_regmap(dev, rclks[i]);
	if (ret)
	return ret;
	}

	ret = devm_of_clk_add_hw_provider(dev, qcom_cc_clk_hw_get, cc);
	if (ret)
	return ret;

	return 0;
	}
	EXPORT_SYMBOL_GPL(qcom_cc_really_probe);

	int qcom_cc_probe(struct platform_device pdev, const struct qcom_cc_desc desc)
	{
	struct regmap *regmap;

	regmap = qcom_cc_map(pdev, desc);
	if (IS_ERR(regmap))
	return PTR_ERR(regmap);

	return qcom_cc_really_probe(pdev, desc, regmap);
	}
	EXPORT_SYMBOL_GPL(qcom_cc_probe);

	MODULE_LICENSE("GPL v2");