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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version 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 you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin street fifth floor boston ma 02110 1301 usa this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option [no]_[pad]_[ctrl] any later version 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 you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin street fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 176 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Jilayne Lovejoy <opensource@jilayne.com> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190519154040.652910950@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hisilicon clock separated gate driver
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*
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* Copyright (c) 2012-2013 Hisilicon Limited.
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* Copyright (c) 2012-2013 Linaro Limited.
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*
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* Author: Haojian Zhuang <haojian.zhuang@linaro.org>
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* Xin Li <li.xin@linaro.org>
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*/
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#include <linux/kernel.h>
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#include <linux/clk-provider.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include "clk.h"
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/* clock separated gate register offset */
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#define CLKGATE_SEPERATED_ENABLE 0x0
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#define CLKGATE_SEPERATED_DISABLE 0x4
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#define CLKGATE_SEPERATED_STATUS 0x8
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struct clkgate_separated {
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struct clk_hw hw;
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void __iomem *enable; /* enable register */
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u8 bit_idx; /* bits in enable/disable register */
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u8 flags;
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spinlock_t *lock;
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};
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static int clkgate_separated_enable(struct clk_hw *hw)
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{
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struct clkgate_separated *sclk;
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unsigned long flags = 0;
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u32 reg;
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sclk = container_of(hw, struct clkgate_separated, hw);
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if (sclk->lock)
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spin_lock_irqsave(sclk->lock, flags);
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reg = BIT(sclk->bit_idx);
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writel_relaxed(reg, sclk->enable);
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readl_relaxed(sclk->enable + CLKGATE_SEPERATED_STATUS);
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if (sclk->lock)
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spin_unlock_irqrestore(sclk->lock, flags);
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return 0;
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}
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static void clkgate_separated_disable(struct clk_hw *hw)
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{
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struct clkgate_separated *sclk;
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unsigned long flags = 0;
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u32 reg;
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sclk = container_of(hw, struct clkgate_separated, hw);
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if (sclk->lock)
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spin_lock_irqsave(sclk->lock, flags);
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reg = BIT(sclk->bit_idx);
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writel_relaxed(reg, sclk->enable + CLKGATE_SEPERATED_DISABLE);
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readl_relaxed(sclk->enable + CLKGATE_SEPERATED_STATUS);
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if (sclk->lock)
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spin_unlock_irqrestore(sclk->lock, flags);
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}
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static int clkgate_separated_is_enabled(struct clk_hw *hw)
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{
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struct clkgate_separated *sclk;
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u32 reg;
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sclk = container_of(hw, struct clkgate_separated, hw);
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reg = readl_relaxed(sclk->enable + CLKGATE_SEPERATED_STATUS);
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reg &= BIT(sclk->bit_idx);
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return reg ? 1 : 0;
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}
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static const struct clk_ops clkgate_separated_ops = {
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.enable = clkgate_separated_enable,
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.disable = clkgate_separated_disable,
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.is_enabled = clkgate_separated_is_enabled,
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};
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struct clk *hisi_register_clkgate_sep(struct device *dev, const char *name,
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const char *parent_name,
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unsigned long flags,
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void __iomem *reg, u8 bit_idx,
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u8 clk_gate_flags, spinlock_t *lock)
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{
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struct clkgate_separated *sclk;
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struct clk *clk;
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struct clk_init_data init;
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sclk = kzalloc(sizeof(*sclk), GFP_KERNEL);
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if (!sclk)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &clkgate_separated_ops;
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init.flags = flags;
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init.parent_names = (parent_name ? &parent_name : NULL);
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init.num_parents = (parent_name ? 1 : 0);
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sclk->enable = reg + CLKGATE_SEPERATED_ENABLE;
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sclk->bit_idx = bit_idx;
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sclk->flags = clk_gate_flags;
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sclk->hw.init = &init;
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sclk->lock = lock;
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clk = clk_register(dev, &sclk->hw);
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if (IS_ERR(clk))
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kfree(sclk);
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return clk;
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}
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