Release 4.11 drivers/clk/qcom/clk-rpm.c

Directory: drivers/clk/qcom
/*
 * Copyright (c) 2016, Linaro Limited
 * Copyright (c) 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/clk-provider.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/mfd/qcom_rpm.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>

#include <dt-bindings/mfd/qcom-rpm.h>
#include <dt-bindings/clock/qcom,rpmcc.h>


#define QCOM_RPM_MISC_CLK_TYPE				0x306b6c63

#define QCOM_RPM_SCALING_ENABLE_ID			0x2


#define DEFINE_CLK_RPM(_platform, _name, _active, r_id)			      \
	static struct clk_rpm _platform##_##_active;                          \
        static struct clk_rpm _platform##_##_name = {                         \
                .rpm_clk_id = (r_id),                                         \
                .peer = &_platform##_##_active,                               \
                .rate = INT_MAX,                                              \
                .hw.init = &(struct clk_init_data){                           \
                        .ops = &clk_rpm_ops,                                  \
                        .name = #_name,                                       \
                        .parent_names = (const char *[]){ "pxo_board" },      \
                        .num_parents = 1,                                     \
                },                                                            \
        };                                                                    \
        static struct clk_rpm _platform##_##_active = {                       \
                .rpm_clk_id = (r_id),                                         \
                .peer = &_platform##_##_name,                                 \
                .active_only = true,                                          \
                .rate = INT_MAX,                                              \
                .hw.init = &(struct clk_init_data){                           \
                        .ops = &clk_rpm_ops,                                  \
                        .name = #_active,                                     \
                        .parent_names = (const char *[]){ "pxo_board" },      \
                        .num_parents = 1,                                     \
                },                                                            \
        }


#define DEFINE_CLK_RPM_PXO_BRANCH(_platform, _name, _active, r_id, r)	      \
	static struct clk_rpm _platform##_##_active;                          \
        static struct clk_rpm _platform##_##_name = {                         \
                .rpm_clk_id = (r_id),                                         \
                .active_only = true,                                          \
                .peer = &_platform##_##_active,                               \
                .rate = (r),                                                  \
                .branch = true,                                               \
                .hw.init = &(struct clk_init_data){                           \
                        .ops = &clk_rpm_branch_ops,                           \
                        .name = #_name,                                       \
                        .parent_names = (const char *[]){ "pxo_board" },      \
                        .num_parents = 1,                                     \
                },                                                            \
        };                                                                    \
        static struct clk_rpm _platform##_##_active = {                       \
                .rpm_clk_id = (r_id),                                         \
                .peer = &_platform##_##_name,                                 \
                .rate = (r),                                                  \
                .branch = true,                                               \
                .hw.init = &(struct clk_init_data){                           \
                        .ops = &clk_rpm_branch_ops,                           \
                        .name = #_active,                                     \
                        .parent_names = (const char *[]){ "pxo_board" },      \
                        .num_parents = 1,                                     \
                },                                                            \
        }


#define DEFINE_CLK_RPM_CXO_BRANCH(_platform, _name, _active, r_id, r)	      \
	static struct clk_rpm _platform##_##_active;                          \
        static struct clk_rpm _platform##_##_name = {                         \
                .rpm_clk_id = (r_id),                                         \
                .peer = &_platform##_##_active,                               \
                .rate = (r),                                                  \
                .branch = true,                                               \
                .hw.init = &(struct clk_init_data){                           \
                        .ops = &clk_rpm_branch_ops,                           \
                        .name = #_name,                                       \
                        .parent_names = (const char *[]){ "cxo_board" },      \
                        .num_parents = 1,                                     \
                },                                                            \
        };                                                                    \
        static struct clk_rpm _platform##_##_active = {                       \
                .rpm_clk_id = (r_id),                                         \
                .active_only = true,                                          \
                .peer = &_platform##_##_name,                                 \
                .rate = (r),                                                  \
                .branch = true,                                               \
                .hw.init = &(struct clk_init_data){                           \
                        .ops = &clk_rpm_branch_ops,                           \
                        .name = #_active,                                     \
                        .parent_names = (const char *[]){ "cxo_board" },      \
                        .num_parents = 1,                                     \
                },                                                            \
        }


#define to_clk_rpm(_hw) container_of(_hw, struct clk_rpm, hw)


struct clk_rpm {
	
const int rpm_clk_id;
	
const bool active_only;
	
unsigned long rate;
	
bool enabled;
	
bool branch;
	
struct clk_rpm *peer;
	
struct clk_hw hw;
	
struct qcom_rpm *rpm;
};


struct rpm_cc {
	
struct qcom_rpm *rpm;
	
struct clk_rpm **clks;
	
size_t num_clks;
};


struct rpm_clk_desc {
	
struct clk_rpm **clks;
	
size_t num_clks;
};

static DEFINE_MUTEX(rpm_clk_lock);



static int clk_rpm_handoff(struct clk_rpm *r)
{
	int ret;
	u32 value = INT_MAX;

	ret = qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE,
			     r->rpm_clk_id, &value, 1);
	if (ret)
		return ret;
	ret = qcom_rpm_write(r->rpm, QCOM_RPM_SLEEP_STATE,
			     r->rpm_clk_id, &value, 1);
	if (ret)
		return ret;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 76 100.00% 1 100.00%
Total 76 100.00% 1 100.00%



static int clk_rpm_set_rate_active(struct clk_rpm *r, unsigned long rate)
{
	u32 value = DIV_ROUND_UP(rate, 1000); /* to kHz */

	return qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE,
			      r->rpm_clk_id, &value, 1);
}

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 45 100.00% 1 100.00%
Total 45 100.00% 1 100.00%



static int clk_rpm_set_rate_sleep(struct clk_rpm *r, unsigned long rate)
{
	u32 value = DIV_ROUND_UP(rate, 1000); /* to kHz */

	return qcom_rpm_write(r->rpm, QCOM_RPM_SLEEP_STATE,
			      r->rpm_clk_id, &value, 1);
}

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 45 100.00% 1 100.00%
Total 45 100.00% 1 100.00%



static void to_active_sleep(struct clk_rpm *r, unsigned long rate,
			    unsigned long *active, unsigned long *sleep)
{
	*active = rate;

	/*
         * Active-only clocks don't care what the rate is during sleep. So,
         * they vote for zero.
         */
	if (r->active_only)
		*sleep = 0;
	else
		*sleep = *active;
}

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 49 100.00% 1 100.00%
Total 49 100.00% 1 100.00%



static int clk_rpm_prepare(struct clk_hw *hw)
{
	struct clk_rpm *r = to_clk_rpm(hw);
	struct clk_rpm *peer = r->peer;
	unsigned long this_rate = 0, this_sleep_rate = 0;
	unsigned long peer_rate = 0, peer_sleep_rate = 0;
	unsigned long active_rate, sleep_rate;
	int ret = 0;

	mutex_lock(&rpm_clk_lock);

	/* Don't send requests to the RPM if the rate has not been set. */
	if (!r->rate)
		goto out;

	to_active_sleep(r, r->rate, &this_rate, &this_sleep_rate);

	/* Take peer clock's rate into account only if it's enabled. */
	if (peer->enabled)
		to_active_sleep(peer, peer->rate,
				&peer_rate, &peer_sleep_rate);

	active_rate = max(this_rate, peer_rate);

	if (r->branch)
		active_rate = !!active_rate;

	ret = clk_rpm_set_rate_active(r, active_rate);
	if (ret)
		goto out;

	sleep_rate = max(this_sleep_rate, peer_sleep_rate);
	if (r->branch)
		sleep_rate = !!sleep_rate;

	ret = clk_rpm_set_rate_sleep(r, sleep_rate);
	if (ret)
		/* Undo the active set vote and restore it */
		ret = clk_rpm_set_rate_active(r, peer_rate);

out:
	if (!ret)
		r->enabled = true;

	mutex_unlock(&rpm_clk_lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 218 100.00% 1 100.00%
Total 218 100.00% 1 100.00%



static void clk_rpm_unprepare(struct clk_hw *hw)
{
	struct clk_rpm *r = to_clk_rpm(hw);
	struct clk_rpm *peer = r->peer;
	unsigned long peer_rate = 0, peer_sleep_rate = 0;
	unsigned long active_rate, sleep_rate;
	int ret;

	mutex_lock(&rpm_clk_lock);

	if (!r->rate)
		goto out;

	/* Take peer clock's rate into account only if it's enabled. */
	if (peer->enabled)
		to_active_sleep(peer, peer->rate, &peer_rate,
				&peer_sleep_rate);

	active_rate = r->branch ? !!peer_rate : peer_rate;
	ret = clk_rpm_set_rate_active(r, active_rate);
	if (ret)
		goto out;

	sleep_rate = r->branch ? !!peer_sleep_rate : peer_sleep_rate;
	ret = clk_rpm_set_rate_sleep(r, sleep_rate);
	if (ret)
		goto out;

	r->enabled = false;

out:
	mutex_unlock(&rpm_clk_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 157 100.00% 1 100.00%
Total 157 100.00% 1 100.00%



static int clk_rpm_set_rate(struct clk_hw *hw,
			    unsigned long rate, unsigned long parent_rate)
{
	struct clk_rpm *r = to_clk_rpm(hw);
	struct clk_rpm *peer = r->peer;
	unsigned long active_rate, sleep_rate;
	unsigned long this_rate = 0, this_sleep_rate = 0;
	unsigned long peer_rate = 0, peer_sleep_rate = 0;
	int ret = 0;

	mutex_lock(&rpm_clk_lock);

	if (!r->enabled)
		goto out;

	to_active_sleep(r, rate, &this_rate, &this_sleep_rate);

	/* Take peer clock's rate into account only if it's enabled. */
	if (peer->enabled)
		to_active_sleep(peer, peer->rate,
				&peer_rate, &peer_sleep_rate);

	active_rate = max(this_rate, peer_rate);
	ret = clk_rpm_set_rate_active(r, active_rate);
	if (ret)
		goto out;

	sleep_rate = max(this_sleep_rate, peer_sleep_rate);
	ret = clk_rpm_set_rate_sleep(r, sleep_rate);
	if (ret)
		goto out;

	r->rate = rate;

out:
	mutex_unlock(&rpm_clk_lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 187 100.00% 1 100.00%
Total 187 100.00% 1 100.00%



static long clk_rpm_round_rate(struct clk_hw *hw, unsigned long rate,
			       unsigned long *parent_rate)
{
	/*
         * RPM handles rate rounding and we don't have a way to
         * know what the rate will be, so just return whatever
         * rate is requested.
         */
	return rate;
}

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static unsigned long clk_rpm_recalc_rate(struct clk_hw *hw,
					 unsigned long parent_rate)
{
	struct clk_rpm *r = to_clk_rpm(hw);

	/*
         * RPM handles rate rounding and we don't have a way to
         * know what the rate will be, so just return whatever
         * rate was set.
         */
	return r->rate;
}

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%


static const struct clk_ops clk_rpm_ops = {
	.prepare	= clk_rpm_prepare,
	.unprepare	= clk_rpm_unprepare,
	.set_rate	= clk_rpm_set_rate,
	.round_rate	= clk_rpm_round_rate,
	.recalc_rate	= clk_rpm_recalc_rate,
};


static const struct clk_ops clk_rpm_branch_ops = {
	.prepare	= clk_rpm_prepare,
	.unprepare	= clk_rpm_unprepare,
	.round_rate	= clk_rpm_round_rate,
	.recalc_rate	= clk_rpm_recalc_rate,
};

/* apq8064 */
DEFINE_CLK_RPM(apq8064, afab_clk, afab_a_clk, QCOM_RPM_APPS_FABRIC_CLK);
DEFINE_CLK_RPM(apq8064, cfpb_clk, cfpb_a_clk, QCOM_RPM_CFPB_CLK);
DEFINE_CLK_RPM(apq8064, daytona_clk, daytona_a_clk, QCOM_RPM_DAYTONA_FABRIC_CLK);
DEFINE_CLK_RPM(apq8064, ebi1_clk, ebi1_a_clk, QCOM_RPM_EBI1_CLK);
DEFINE_CLK_RPM(apq8064, mmfab_clk, mmfab_a_clk, QCOM_RPM_MM_FABRIC_CLK);
DEFINE_CLK_RPM(apq8064, mmfpb_clk, mmfpb_a_clk, QCOM_RPM_MMFPB_CLK);
DEFINE_CLK_RPM(apq8064, sfab_clk, sfab_a_clk, QCOM_RPM_SYS_FABRIC_CLK);
DEFINE_CLK_RPM(apq8064, sfpb_clk, sfpb_a_clk, QCOM_RPM_SFPB_CLK);
DEFINE_CLK_RPM(apq8064, qdss_clk, qdss_a_clk, QCOM_RPM_QDSS_CLK);


static struct clk_rpm *apq8064_clks[] = {
	[RPM_APPS_FABRIC_CLK] = &apq8064_afab_clk,
	[RPM_APPS_FABRIC_A_CLK] = &apq8064_afab_a_clk,
	[RPM_CFPB_CLK] = &apq8064_cfpb_clk,
	[RPM_CFPB_A_CLK] = &apq8064_cfpb_a_clk,
	[RPM_DAYTONA_FABRIC_CLK] = &apq8064_daytona_clk,
	[RPM_DAYTONA_FABRIC_A_CLK] = &apq8064_daytona_a_clk,
	[RPM_EBI1_CLK] = &apq8064_ebi1_clk,
	[RPM_EBI1_A_CLK] = &apq8064_ebi1_a_clk,
	[RPM_MM_FABRIC_CLK] = &apq8064_mmfab_clk,
	[RPM_MM_FABRIC_A_CLK] = &apq8064_mmfab_a_clk,
	[RPM_MMFPB_CLK] = &apq8064_mmfpb_clk,
	[RPM_MMFPB_A_CLK] = &apq8064_mmfpb_a_clk,
	[RPM_SYS_FABRIC_CLK] = &apq8064_sfab_clk,
	[RPM_SYS_FABRIC_A_CLK] = &apq8064_sfab_a_clk,
	[RPM_SFPB_CLK] = &apq8064_sfpb_clk,
	[RPM_SFPB_A_CLK] = &apq8064_sfpb_a_clk,
	[RPM_QDSS_CLK] = &apq8064_qdss_clk,
	[RPM_QDSS_A_CLK] = &apq8064_qdss_a_clk,
};


static const struct rpm_clk_desc rpm_clk_apq8064 = {
	.clks = apq8064_clks,
	.num_clks = ARRAY_SIZE(apq8064_clks),
};


static const struct of_device_id rpm_clk_match_table[] = {
	{ .compatible = "qcom,rpmcc-apq8064", .data = &rpm_clk_apq8064 },
	{ }
};
MODULE_DEVICE_TABLE(of, rpm_clk_match_table);



static struct clk_hw *qcom_rpm_clk_hw_get(struct of_phandle_args *clkspec,
					  void *data)
{
	struct rpm_cc *rcc = data;
	unsigned int idx = clkspec->args[0];

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

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

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 85 100.00% 1 100.00%
Total 85 100.00% 1 100.00%



static int rpm_clk_probe(struct platform_device *pdev)
{
	struct rpm_cc *rcc;
	int ret;
	size_t num_clks, i;
	struct qcom_rpm *rpm;
	struct clk_rpm **rpm_clks;
	const struct rpm_clk_desc *desc;

	rpm = dev_get_drvdata(pdev->dev.parent);
	if (!rpm) {
		dev_err(&pdev->dev, "Unable to retrieve handle to RPM\n");
		return -ENODEV;
	}

	desc = of_device_get_match_data(&pdev->dev);
	if (!desc)
		return -EINVAL;

	rpm_clks = desc->clks;
	num_clks = desc->num_clks;

	rcc = devm_kzalloc(&pdev->dev, sizeof(*rcc), GFP_KERNEL);
	if (!rcc)
		return -ENOMEM;

	rcc->clks = rpm_clks;
	rcc->num_clks = num_clks;

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

		rpm_clks[i]->rpm = rpm;

		ret = clk_rpm_handoff(rpm_clks[i]);
		if (ret)
			goto err;
	}

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

		ret = devm_clk_hw_register(&pdev->dev, &rpm_clks[i]->hw);
		if (ret)
			goto err;
	}

	ret = of_clk_add_hw_provider(pdev->dev.of_node, qcom_rpm_clk_hw_get,
				     rcc);
	if (ret)
		goto err;

	return 0;
err:
	dev_err(&pdev->dev, "Error registering RPM Clock driver (%d)\n", ret);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 284 100.00% 2 100.00%
Total 284 100.00% 2 100.00%



static int rpm_clk_remove(struct platform_device *pdev)
{
	of_clk_del_provider(pdev->dev.of_node);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 23 100.00% 1 100.00%
Total 23 100.00% 1 100.00%


static struct platform_driver rpm_clk_driver = {
	.driver = {
		.name = "qcom-clk-rpm",
		.of_match_table = rpm_clk_match_table,
        },
	.probe = rpm_clk_probe,
	.remove = rpm_clk_remove,
};



static int __init rpm_clk_init(void)
{
	return platform_driver_register(&rpm_clk_driver);
}
Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%


core_initcall(rpm_clk_init);



static void __exit rpm_clk_exit(void)
{
	platform_driver_unregister(&rpm_clk_driver);
}
Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 15 100.00% 1 100.00%
Total 15 100.00% 1 100.00%


module_exit(rpm_clk_exit);

MODULE_DESCRIPTION("Qualcomm RPM Clock Controller Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:qcom-clk-rpm");
Overall Contributors
Person Tokens Prop Commits CommitProp
Georgi Djakov 1838 100.00% 2 100.00%
Total 1838 100.00% 2 100.00%
Directory: drivers/clk/qcom

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Georgi Djakov	76	100.00%	1	100.00%
Total	76	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 drivers/clk/qcom/clk-rpm.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
