1 // SPDX-License-Identifier: GPL-2.0+
4 * Dong Aisheng <aisheng.dong@nxp.com>
7 #include <linux/clk-provider.h>
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
15 static DEFINE_SPINLOCK(imx_lpcg_scu_lock);
17 #define CLK_GATE_SCU_LPCG_MASK 0x3
18 #define CLK_GATE_SCU_LPCG_HW_SEL BIT(0)
19 #define CLK_GATE_SCU_LPCG_SW_SEL BIT(1)
22 * struct clk_lpcg_scu - Description of LPCG clock
24 * @hw: clk_hw of this LPCG
25 * @reg: register of this LPCG clock
26 * @bit_idx: bit index of this LPCG clock
27 * @hw_gate: HW auto gate enable
29 * This structure describes one LPCG clock
38 #define to_clk_lpcg_scu(_hw) container_of(_hw, struct clk_lpcg_scu, hw)
40 static int clk_lpcg_scu_enable(struct clk_hw *hw)
42 struct clk_lpcg_scu *clk = to_clk_lpcg_scu(hw);
46 spin_lock_irqsave(&imx_lpcg_scu_lock, flags);
48 reg = readl_relaxed(clk->reg);
49 reg &= ~(CLK_GATE_SCU_LPCG_MASK << clk->bit_idx);
51 val = CLK_GATE_SCU_LPCG_SW_SEL;
53 val |= CLK_GATE_SCU_LPCG_HW_SEL;
55 reg |= val << clk->bit_idx;
56 writel(reg, clk->reg);
58 spin_unlock_irqrestore(&imx_lpcg_scu_lock, flags);
63 static void clk_lpcg_scu_disable(struct clk_hw *hw)
65 struct clk_lpcg_scu *clk = to_clk_lpcg_scu(hw);
69 spin_lock_irqsave(&imx_lpcg_scu_lock, flags);
71 reg = readl_relaxed(clk->reg);
72 reg &= ~(CLK_GATE_SCU_LPCG_MASK << clk->bit_idx);
73 writel(reg, clk->reg);
75 spin_unlock_irqrestore(&imx_lpcg_scu_lock, flags);
78 static const struct clk_ops clk_lpcg_scu_ops = {
79 .enable = clk_lpcg_scu_enable,
80 .disable = clk_lpcg_scu_disable,
83 struct clk_hw *imx_clk_lpcg_scu(const char *name, const char *parent_name,
84 unsigned long flags, void __iomem *reg,
85 u8 bit_idx, bool hw_gate)
87 struct clk_lpcg_scu *clk;
88 struct clk_init_data init;
92 clk = kzalloc(sizeof(*clk), GFP_KERNEL);
94 return ERR_PTR(-ENOMEM);
97 clk->bit_idx = bit_idx;
98 clk->hw_gate = hw_gate;
101 init.ops = &clk_lpcg_scu_ops;
102 init.flags = CLK_SET_RATE_PARENT | flags;
103 init.parent_names = parent_name ? &parent_name : NULL;
104 init.num_parents = parent_name ? 1 : 0;
106 clk->hw.init = &init;
109 ret = clk_hw_register(NULL, hw);