146 lines
4.0 KiB
C
146 lines
4.0 KiB
C
/****************************************************************************
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* drivers/clk/clk_gate.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/clk/clk_provider.h>
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#include <debug.h>
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#include "clk.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define to_clk_gate(_clk) (FAR struct clk_gate_s *)(_clk->private_data)
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static void clk_gate_endisable(FAR struct clk_s *clk, int32_t enable)
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{
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FAR struct clk_gate_s *gate = to_clk_gate(clk);
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int32_t set = gate->flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0;
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uint32_t val;
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set ^= enable;
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if (gate->flags & CLK_GATE_HIWORD_MASK)
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{
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val = BIT(gate->bit_idx + 16);
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if (set)
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{
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val |= BIT(gate->bit_idx);
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}
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}
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else
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{
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val = clk_read(gate->reg);
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if (set)
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{
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val |= BIT(gate->bit_idx);
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}
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else
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{
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val &= ~BIT(gate->bit_idx);
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}
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}
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clk_write(gate->reg, val);
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}
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static int clk_gate_enable(FAR struct clk_s *clk)
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{
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clk_gate_endisable(clk, 1);
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return 0;
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}
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static void clk_gate_disable(FAR struct clk_s *clk)
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{
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clk_gate_endisable(clk, 0);
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}
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static int clk_gate_is_enabled(FAR struct clk_s *clk)
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{
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FAR struct clk_gate_s *gate = to_clk_gate(clk);
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uint32_t val;
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val = clk_read(gate->reg);
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if (gate->flags & CLK_GATE_SET_TO_DISABLE)
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{
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val ^= BIT(gate->bit_idx);
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}
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val &= BIT(gate->bit_idx);
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return val ? 1 : 0;
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}
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/****************************************************************************
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* Public Data
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****************************************************************************/
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const struct clk_ops_s g_clk_gate_ops =
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{
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.enable = clk_gate_enable,
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.disable = clk_gate_disable,
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.is_enabled = clk_gate_is_enabled,
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};
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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FAR struct clk_s *clk_register_gate(FAR const char *name,
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FAR const char *parent_name,
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uint8_t flags, uint32_t reg,
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uint8_t bit_idx,
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uint8_t clk_gate_flags)
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{
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FAR struct clk_gate_s gate;
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FAR const char **parent_names;
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uint8_t num_parents;
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if (clk_gate_flags & CLK_GATE_HIWORD_MASK)
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{
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if (bit_idx > 16)
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{
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return NULL;
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}
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}
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parent_names = parent_name ? &parent_name : NULL;
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num_parents = parent_name ? 1 : 0;
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gate.reg = reg;
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gate.bit_idx = bit_idx;
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gate.flags = clk_gate_flags;
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return clk_register(name, parent_names, num_parents, flags,
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&g_clk_gate_ops, &gate, sizeof(gate));
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}
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