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
44 	u32 reg;  in clk_gate2_do_shared_clks()  local
46 	reg = readl(gate->reg);  in clk_gate2_do_shared_clks()
47 	reg &= ~(gate->cgr_mask << gate->bit_idx);  in clk_gate2_do_shared_clks()
49 		reg |= (gate->cgr_val & gate->cgr_mask) << gate->bit_idx;  in clk_gate2_do_shared_clks()
50 	writel(reg, gate->reg);  in clk_gate2_do_shared_clks()
58 	spin_lock_irqsave(gate->lock, flags);  in clk_gate2_enable()
60 	if (gate->share_count && (*gate->share_count)++ > 0)  in clk_gate2_enable()
65 	spin_unlock_irqrestore(gate->lock, flags);  in clk_gate2_enable()
75 	spin_lock_irqsave(gate->lock, flags);  in clk_gate2_disable()
77 	if (gate->share_count) {  in clk_gate2_disable()
78 		if (WARN_ON(*gate->share_count == 0))  in clk_gate2_disable()
80 		else if (--(*gate->share_count) > 0)  in clk_gate2_disable()
86 	spin_unlock_irqrestore(gate->lock, flags);  in clk_gate2_disable()
89 static int clk_gate2_reg_is_enabled(void __iomem *reg, u8 bit_idx,  in clk_gate2_reg_is_enabled()  argument
92 	u32 val = readl(reg);  in clk_gate2_reg_is_enabled()
106 	spin_lock_irqsave(gate->lock, flags);  in clk_gate2_is_enabled()
108 	ret = clk_gate2_reg_is_enabled(gate->reg, gate->bit_idx,  in clk_gate2_is_enabled()
109 					gate->cgr_val, gate->cgr_mask);  in clk_gate2_is_enabled()
111 	spin_unlock_irqrestore(gate->lock, flags);  in clk_gate2_is_enabled()
121 	spin_lock_irqsave(gate->lock, flags);  in clk_gate2_disable_unused()
123 	if (!gate->share_count || *gate->share_count == 0)  in clk_gate2_disable_unused()
126 	spin_unlock_irqrestore(gate->lock, flags);  in clk_gate2_disable_unused()
138 		void __iomem *reg, u8 bit_idx, u8 cgr_val, u8 cgr_mask,  in clk_hw_register_gate2()  argument
144 	struct clk_init_data init;  in clk_hw_register_gate2()  local
149 		return ERR_PTR(-ENOMEM);  in clk_hw_register_gate2()
152 	gate->reg = reg;  in clk_hw_register_gate2()
153 	gate->bit_idx = bit_idx;  in clk_hw_register_gate2()
154 	gate->cgr_val = cgr_val;  in clk_hw_register_gate2()
155 	gate->cgr_mask = cgr_mask;  in clk_hw_register_gate2()
156 	gate->flags = clk_gate2_flags;  in clk_hw_register_gate2()
157 	gate->lock = lock;  in clk_hw_register_gate2()
158 	gate->share_count = share_count;  in clk_hw_register_gate2()
160 	init.name = name;  in clk_hw_register_gate2()
161 	init.ops = &clk_gate2_ops;  in clk_hw_register_gate2()
162 	init.flags = flags;  in clk_hw_register_gate2()
163 	init.parent_names = parent_name ? &parent_name : NULL;  in clk_hw_register_gate2()
164 	init.num_parents = parent_name ? 1 : 0;  in clk_hw_register_gate2()
166 	gate->hw.init = &init;  in clk_hw_register_gate2()
167 	hw = &gate->hw;  in clk_hw_register_gate2()