131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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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/clkdev.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/clk.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 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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pr_err("%s: fail to allocate separated gated clk\n", __func__);
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return ERR_PTR(-ENOMEM);
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}
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init.name = name;
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init.ops = &clkgate_separated_ops;
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init.flags = flags | CLK_IS_BASIC;
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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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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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