2012-08-27 20:45:50 +07:00
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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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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/clk-provider.h>
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#include <linux/clk-private.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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struct clk_prcmu {
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struct clk_hw hw;
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u8 cg_sel;
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int is_enabled;
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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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hw->init->name);
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}
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static int clk_prcmu_enable(struct clk_hw *hw)
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{
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struct clk_prcmu *clk = to_clk_prcmu(hw);
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clk->is_enabled = 1;
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return 0;
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}
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static void clk_prcmu_disable(struct clk_hw *hw)
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{
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struct clk_prcmu *clk = to_clk_prcmu(hw);
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clk->is_enabled = 0;
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}
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static int clk_prcmu_is_enabled(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 clk->is_enabled;
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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 request_ape_opp100(bool enable)
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{
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static int reqs;
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int err = 0;
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if (enable) {
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if (!reqs)
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err = prcmu_qos_add_requirement(PRCMU_QOS_APE_OPP,
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"clock", 100);
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if (!err)
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reqs++;
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} else {
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reqs--;
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if (!reqs)
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prcmu_qos_remove_requirement(PRCMU_QOS_APE_OPP,
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"clock");
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}
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return err;
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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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err = request_ape_opp100(true);
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if (err) {
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pr_err("clk_prcmu: %s failed to request APE OPP100 for %s.\n",
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__func__, hw->init->name);
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return err;
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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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request_ape_opp100(false);
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return err;
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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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goto out_error;
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if (request_ape_opp100(false))
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goto out_error;
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return;
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out_error:
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pr_err("clk_prcmu: %s failed to disable %s.\n", __func__,
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hw->init->name);
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}
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static 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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.enable = clk_prcmu_enable,
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.disable = clk_prcmu_disable,
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.is_enabled = clk_prcmu_is_enabled,
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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_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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.enable = clk_prcmu_enable,
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.disable = clk_prcmu_disable,
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.is_enabled = clk_prcmu_is_enabled,
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.recalc_rate = clk_prcmu_recalc_rate,
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};
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2012-08-31 19:21:29 +07:00
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static struct clk_ops clk_prcmu_rate_ops = {
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.is_enabled = clk_prcmu_is_enabled,
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.recalc_rate = clk_prcmu_recalc_rate,
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};
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2012-08-27 20:45:50 +07:00
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static 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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.enable = clk_prcmu_enable,
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.disable = clk_prcmu_disable,
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.is_enabled = clk_prcmu_is_enabled,
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.recalc_rate = clk_prcmu_recalc_rate,
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};
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static struct clk *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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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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struct clk *clk_reg;
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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(struct clk_prcmu), GFP_KERNEL);
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if (!clk) {
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pr_err("clk_prcmu: %s could not allocate clk\n", __func__);
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return ERR_PTR(-ENOMEM);
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}
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clk->cg_sel = cg_sel;
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clk->is_enabled = 1;
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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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clk_reg = clk_register(NULL, &clk->hw);
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if (IS_ERR_OR_NULL(clk_reg))
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goto free_clk;
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return clk_reg;
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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 *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 *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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2012-08-31 19:21:29 +07:00
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struct clk *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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2012-08-27 20:45:50 +07:00
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struct clk *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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