1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2010-2011 Canonical Ltd <jeremy.kerr@canonical.com>
4  * Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@linaro.org>
9 #include <linux/clk-provider.h>
22  * prepare - clk_(un)prepare only ensures parent is (un)prepared
23  * enable - clk_enable and clk_disable are functional & control gating
24  * rate - inherits rate from parent.  No clk_set_rate support
25  * parent - fixed parent.  No clk_set_parent support
30 	void __iomem	*reg;  member
43 	u32 reg;  in clk_gate2_enable()  local
47 	spin_lock_irqsave(gate->lock, flags);  in clk_gate2_enable()
49 	if (gate->share_count && (*gate->share_count)++ > 0)  in clk_gate2_enable()
52 	if (gate->flags & IMX_CLK_GATE2_SINGLE_BIT) {  in clk_gate2_enable()
55 		reg = readl(gate->reg);  in clk_gate2_enable()
56 		reg &= ~(3 << gate->bit_idx);  in clk_gate2_enable()
57 		reg |= gate->cgr_val << gate->bit_idx;  in clk_gate2_enable()
58 		writel(reg, gate->reg);  in clk_gate2_enable()
62 	spin_unlock_irqrestore(gate->lock, flags);  in clk_gate2_enable()
70 	u32 reg;  in clk_gate2_disable()  local
73 	spin_lock_irqsave(gate->lock, flags);  in clk_gate2_disable()
75 	if (gate->share_count) {  in clk_gate2_disable()
76 		if (WARN_ON(*gate->share_count == 0))  in clk_gate2_disable()
78 		else if (--(*gate->share_count) > 0)  in clk_gate2_disable()
82 	if (gate->flags & IMX_CLK_GATE2_SINGLE_BIT) {  in clk_gate2_disable()
85 		reg = readl(gate->reg);  in clk_gate2_disable()
86 		reg &= ~(3 << gate->bit_idx);  in clk_gate2_disable()
87 		writel(reg, gate->reg);  in clk_gate2_disable()
91 	spin_unlock_irqrestore(gate->lock, flags);  in clk_gate2_disable()
94 static int clk_gate2_reg_is_enabled(void __iomem *reg, u8 bit_idx)  in clk_gate2_reg_is_enabled()  argument
96 	u32 val = readl(reg);  in clk_gate2_reg_is_enabled()
108 	if (gate->flags & IMX_CLK_GATE2_SINGLE_BIT)  in clk_gate2_is_enabled()
111 	return clk_gate2_reg_is_enabled(gate->reg, gate->bit_idx);  in clk_gate2_is_enabled()
118 	u32 reg;  in clk_gate2_disable_unused()  local
120 	if (gate->flags & IMX_CLK_GATE2_SINGLE_BIT)  in clk_gate2_disable_unused()
123 	spin_lock_irqsave(gate->lock, flags);  in clk_gate2_disable_unused()
125 	if (!gate->share_count || *gate->share_count == 0) {  in clk_gate2_disable_unused()
126 		reg = readl(gate->reg);  in clk_gate2_disable_unused()
127 		reg &= ~(3 << gate->bit_idx);  in clk_gate2_disable_unused()
128 		writel(reg, gate->reg);  in clk_gate2_disable_unused()
131 	spin_unlock_irqrestore(gate->lock, flags);  in clk_gate2_disable_unused()
143 		void __iomem *reg, u8 bit_idx, u8 cgr_val,  in clk_hw_register_gate2()  argument
149 	struct clk_init_data init;  in clk_hw_register_gate2()  local
154 		return ERR_PTR(-ENOMEM);  in clk_hw_register_gate2()
157 	gate->reg = reg;  in clk_hw_register_gate2()
158 	gate->bit_idx = bit_idx;  in clk_hw_register_gate2()
159 	gate->cgr_val = cgr_val;  in clk_hw_register_gate2()
160 	gate->flags = clk_gate2_flags;  in clk_hw_register_gate2()
161 	gate->lock = lock;  in clk_hw_register_gate2()
162 	gate->share_count = share_count;  in clk_hw_register_gate2()
164 	init.name = name;  in clk_hw_register_gate2()
165 	init.ops = &clk_gate2_ops;  in clk_hw_register_gate2()
166 	init.flags = flags;  in clk_hw_register_gate2()
167 	init.parent_names = parent_name ? &parent_name : NULL;  in clk_hw_register_gate2()
168 	init.num_parents = parent_name ? 1 : 0;  in clk_hw_register_gate2()
170 	gate->hw.init = &init;  in clk_hw_register_gate2()
171 	hw = &gate->hw;  in clk_hw_register_gate2()