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