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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * PRCMU clock implementation for ux500 platform.
- *
- * Copyright (C) 2012 ST-Ericsson SA
- * Author: Ulf Hansson <[email protected]>
- */
- #include <linux/clk-provider.h>
- #include <linux/mfd/dbx500-prcmu.h>
- #include <linux/slab.h>
- #include <linux/io.h>
- #include <linux/err.h>
- #include "clk.h"
- #define to_clk_prcmu(_hw) container_of(_hw, struct clk_prcmu, hw)
- #define to_clk_prcmu_clkout(_hw) container_of(_hw, struct clk_prcmu_clkout, hw)
- struct clk_prcmu {
- struct clk_hw hw;
- u8 cg_sel;
- int opp_requested;
- };
- struct clk_prcmu_clkout {
- struct clk_hw hw;
- u8 clkout_id;
- u8 source;
- u8 divider;
- };
- /* PRCMU clock operations. */
- static int clk_prcmu_prepare(struct clk_hw *hw)
- {
- struct clk_prcmu *clk = to_clk_prcmu(hw);
- return prcmu_request_clock(clk->cg_sel, true);
- }
- static void clk_prcmu_unprepare(struct clk_hw *hw)
- {
- struct clk_prcmu *clk = to_clk_prcmu(hw);
- if (prcmu_request_clock(clk->cg_sel, false))
- pr_err("clk_prcmu: %s failed to disable %s.\n", __func__,
- clk_hw_get_name(hw));
- }
- static unsigned long clk_prcmu_recalc_rate(struct clk_hw *hw,
- unsigned long parent_rate)
- {
- struct clk_prcmu *clk = to_clk_prcmu(hw);
- return prcmu_clock_rate(clk->cg_sel);
- }
- static long clk_prcmu_round_rate(struct clk_hw *hw, unsigned long rate,
- unsigned long *parent_rate)
- {
- struct clk_prcmu *clk = to_clk_prcmu(hw);
- return prcmu_round_clock_rate(clk->cg_sel, rate);
- }
- static int clk_prcmu_set_rate(struct clk_hw *hw, unsigned long rate,
- unsigned long parent_rate)
- {
- struct clk_prcmu *clk = to_clk_prcmu(hw);
- return prcmu_set_clock_rate(clk->cg_sel, rate);
- }
- static int clk_prcmu_opp_prepare(struct clk_hw *hw)
- {
- int err;
- struct clk_prcmu *clk = to_clk_prcmu(hw);
- if (!clk->opp_requested) {
- err = prcmu_qos_add_requirement(PRCMU_QOS_APE_OPP,
- (char *)clk_hw_get_name(hw),
- 100);
- if (err) {
- pr_err("clk_prcmu: %s fail req APE OPP for %s.\n",
- __func__, clk_hw_get_name(hw));
- return err;
- }
- clk->opp_requested = 1;
- }
- err = prcmu_request_clock(clk->cg_sel, true);
- if (err) {
- prcmu_qos_remove_requirement(PRCMU_QOS_APE_OPP,
- (char *)clk_hw_get_name(hw));
- clk->opp_requested = 0;
- return err;
- }
- return 0;
- }
- static void clk_prcmu_opp_unprepare(struct clk_hw *hw)
- {
- struct clk_prcmu *clk = to_clk_prcmu(hw);
- if (prcmu_request_clock(clk->cg_sel, false)) {
- pr_err("clk_prcmu: %s failed to disable %s.\n", __func__,
- clk_hw_get_name(hw));
- return;
- }
- if (clk->opp_requested) {
- prcmu_qos_remove_requirement(PRCMU_QOS_APE_OPP,
- (char *)clk_hw_get_name(hw));
- clk->opp_requested = 0;
- }
- }
- static int clk_prcmu_opp_volt_prepare(struct clk_hw *hw)
- {
- int err;
- struct clk_prcmu *clk = to_clk_prcmu(hw);
- if (!clk->opp_requested) {
- err = prcmu_request_ape_opp_100_voltage(true);
- if (err) {
- pr_err("clk_prcmu: %s fail req APE OPP VOLT for %s.\n",
- __func__, clk_hw_get_name(hw));
- return err;
- }
- clk->opp_requested = 1;
- }
- err = prcmu_request_clock(clk->cg_sel, true);
- if (err) {
- prcmu_request_ape_opp_100_voltage(false);
- clk->opp_requested = 0;
- return err;
- }
- return 0;
- }
- static void clk_prcmu_opp_volt_unprepare(struct clk_hw *hw)
- {
- struct clk_prcmu *clk = to_clk_prcmu(hw);
- if (prcmu_request_clock(clk->cg_sel, false)) {
- pr_err("clk_prcmu: %s failed to disable %s.\n", __func__,
- clk_hw_get_name(hw));
- return;
- }
- if (clk->opp_requested) {
- prcmu_request_ape_opp_100_voltage(false);
- clk->opp_requested = 0;
- }
- }
- static const struct clk_ops clk_prcmu_scalable_ops = {
- .prepare = clk_prcmu_prepare,
- .unprepare = clk_prcmu_unprepare,
- .recalc_rate = clk_prcmu_recalc_rate,
- .round_rate = clk_prcmu_round_rate,
- .set_rate = clk_prcmu_set_rate,
- };
- static const struct clk_ops clk_prcmu_gate_ops = {
- .prepare = clk_prcmu_prepare,
- .unprepare = clk_prcmu_unprepare,
- .recalc_rate = clk_prcmu_recalc_rate,
- };
- static const struct clk_ops clk_prcmu_scalable_rate_ops = {
- .recalc_rate = clk_prcmu_recalc_rate,
- .round_rate = clk_prcmu_round_rate,
- .set_rate = clk_prcmu_set_rate,
- };
- static const struct clk_ops clk_prcmu_rate_ops = {
- .recalc_rate = clk_prcmu_recalc_rate,
- };
- static const struct clk_ops clk_prcmu_opp_gate_ops = {
- .prepare = clk_prcmu_opp_prepare,
- .unprepare = clk_prcmu_opp_unprepare,
- .recalc_rate = clk_prcmu_recalc_rate,
- };
- static const struct clk_ops clk_prcmu_opp_volt_scalable_ops = {
- .prepare = clk_prcmu_opp_volt_prepare,
- .unprepare = clk_prcmu_opp_volt_unprepare,
- .recalc_rate = clk_prcmu_recalc_rate,
- .round_rate = clk_prcmu_round_rate,
- .set_rate = clk_prcmu_set_rate,
- };
- static struct clk_hw *clk_reg_prcmu(const char *name,
- const char *parent_name,
- u8 cg_sel,
- unsigned long rate,
- unsigned long flags,
- const struct clk_ops *clk_prcmu_ops)
- {
- struct clk_prcmu *clk;
- struct clk_init_data clk_prcmu_init;
- int ret;
- if (!name) {
- pr_err("clk_prcmu: %s invalid arguments passed\n", __func__);
- return ERR_PTR(-EINVAL);
- }
- clk = kzalloc(sizeof(*clk), GFP_KERNEL);
- if (!clk)
- return ERR_PTR(-ENOMEM);
- clk->cg_sel = cg_sel;
- clk->opp_requested = 0;
- /* "rate" can be used for changing the initial frequency */
- if (rate)
- prcmu_set_clock_rate(cg_sel, rate);
- clk_prcmu_init.name = name;
- clk_prcmu_init.ops = clk_prcmu_ops;
- clk_prcmu_init.flags = flags;
- clk_prcmu_init.parent_names = (parent_name ? &parent_name : NULL);
- clk_prcmu_init.num_parents = (parent_name ? 1 : 0);
- clk->hw.init = &clk_prcmu_init;
- ret = clk_hw_register(NULL, &clk->hw);
- if (ret)
- goto free_clk;
- return &clk->hw;
- free_clk:
- kfree(clk);
- pr_err("clk_prcmu: %s failed to register clk\n", __func__);
- return ERR_PTR(-ENOMEM);
- }
- struct clk_hw *clk_reg_prcmu_scalable(const char *name,
- const char *parent_name,
- u8 cg_sel,
- unsigned long rate,
- unsigned long flags)
- {
- return clk_reg_prcmu(name, parent_name, cg_sel, rate, flags,
- &clk_prcmu_scalable_ops);
- }
- struct clk_hw *clk_reg_prcmu_gate(const char *name,
- const char *parent_name,
- u8 cg_sel,
- unsigned long flags)
- {
- return clk_reg_prcmu(name, parent_name, cg_sel, 0, flags,
- &clk_prcmu_gate_ops);
- }
- struct clk_hw *clk_reg_prcmu_scalable_rate(const char *name,
- const char *parent_name,
- u8 cg_sel,
- unsigned long rate,
- unsigned long flags)
- {
- return clk_reg_prcmu(name, parent_name, cg_sel, rate, flags,
- &clk_prcmu_scalable_rate_ops);
- }
- struct clk_hw *clk_reg_prcmu_rate(const char *name,
- const char *parent_name,
- u8 cg_sel,
- unsigned long flags)
- {
- return clk_reg_prcmu(name, parent_name, cg_sel, 0, flags,
- &clk_prcmu_rate_ops);
- }
- struct clk_hw *clk_reg_prcmu_opp_gate(const char *name,
- const char *parent_name,
- u8 cg_sel,
- unsigned long flags)
- {
- return clk_reg_prcmu(name, parent_name, cg_sel, 0, flags,
- &clk_prcmu_opp_gate_ops);
- }
- struct clk_hw *clk_reg_prcmu_opp_volt_scalable(const char *name,
- const char *parent_name,
- u8 cg_sel,
- unsigned long rate,
- unsigned long flags)
- {
- return clk_reg_prcmu(name, parent_name, cg_sel, rate, flags,
- &clk_prcmu_opp_volt_scalable_ops);
- }
- /* The clkout (external) clock is special and need special ops */
- static int clk_prcmu_clkout_prepare(struct clk_hw *hw)
- {
- struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw);
- return prcmu_config_clkout(clk->clkout_id, clk->source, clk->divider);
- }
- static void clk_prcmu_clkout_unprepare(struct clk_hw *hw)
- {
- struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw);
- int ret;
- /* The clkout clock is disabled by dividing by 0 */
- ret = prcmu_config_clkout(clk->clkout_id, clk->source, 0);
- if (ret)
- pr_err("clk_prcmu: %s failed to disable %s\n", __func__,
- clk_hw_get_name(hw));
- }
- static unsigned long clk_prcmu_clkout_recalc_rate(struct clk_hw *hw,
- unsigned long parent_rate)
- {
- struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw);
- return (parent_rate / clk->divider);
- }
- static u8 clk_prcmu_clkout_get_parent(struct clk_hw *hw)
- {
- struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw);
- return clk->source;
- }
- static int clk_prcmu_clkout_set_parent(struct clk_hw *hw, u8 index)
- {
- struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw);
- clk->source = index;
- /* Make sure the change reaches the hardware immediately */
- if (clk_hw_is_prepared(hw))
- return clk_prcmu_clkout_prepare(hw);
- return 0;
- }
- static const struct clk_ops clk_prcmu_clkout_ops = {
- .prepare = clk_prcmu_clkout_prepare,
- .unprepare = clk_prcmu_clkout_unprepare,
- .recalc_rate = clk_prcmu_clkout_recalc_rate,
- .get_parent = clk_prcmu_clkout_get_parent,
- .set_parent = clk_prcmu_clkout_set_parent,
- };
- struct clk_hw *clk_reg_prcmu_clkout(const char *name,
- const char * const *parent_names,
- int num_parents,
- u8 source, u8 divider)
- {
- struct clk_prcmu_clkout *clk;
- struct clk_init_data clk_prcmu_clkout_init;
- u8 clkout_id;
- int ret;
- if (!name) {
- pr_err("clk_prcmu_clkout: %s invalid arguments passed\n", __func__);
- return ERR_PTR(-EINVAL);
- }
- if (!strcmp(name, "clkout1"))
- clkout_id = 0;
- else if (!strcmp(name, "clkout2"))
- clkout_id = 1;
- else {
- pr_err("clk_prcmu_clkout: %s bad clock name\n", __func__);
- return ERR_PTR(-EINVAL);
- }
- clk = kzalloc(sizeof(*clk), GFP_KERNEL);
- if (!clk)
- return ERR_PTR(-ENOMEM);
- clk->clkout_id = clkout_id;
- clk->source = source;
- clk->divider = divider;
- clk_prcmu_clkout_init.name = name;
- clk_prcmu_clkout_init.ops = &clk_prcmu_clkout_ops;
- clk_prcmu_clkout_init.flags = CLK_GET_RATE_NOCACHE;
- clk_prcmu_clkout_init.parent_names = parent_names;
- clk_prcmu_clkout_init.num_parents = num_parents;
- clk->hw.init = &clk_prcmu_clkout_init;
- ret = clk_hw_register(NULL, &clk->hw);
- if (ret)
- goto free_clkout;
- return &clk->hw;
- free_clkout:
- kfree(clk);
- pr_err("clk_prcmu_clkout: %s failed to register clk\n", __func__);
- return ERR_PTR(-ENOMEM);
- }
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