1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Hisilicon clock separated gate driver
5 * Copyright (c) 2012-2013 Hisilicon Limited.
6 * Copyright (c) 2012-2013 Linaro Limited.
8 * Author: Haojian Zhuang <haojian.zhuang@linaro.org>
9 * Xin Li <li.xin@linaro.org>
12 #include <linux/kernel.h>
13 #include <linux/clk-provider.h>
15 #include <linux/slab.h>
19 /* clock separated gate register offset */
20 #define CLKGATE_SEPERATED_ENABLE 0x0
21 #define CLKGATE_SEPERATED_DISABLE 0x4
22 #define CLKGATE_SEPERATED_STATUS 0x8
24 struct clkgate_separated {
26 void __iomem *enable; /* enable register */
27 u8 bit_idx; /* bits in enable/disable register */
32 static int clkgate_separated_enable(struct clk_hw *hw)
34 struct clkgate_separated *sclk;
35 unsigned long flags = 0;
38 sclk = container_of(hw, struct clkgate_separated, hw);
40 spin_lock_irqsave(sclk->lock, flags);
41 reg = BIT(sclk->bit_idx);
42 writel_relaxed(reg, sclk->enable);
43 readl_relaxed(sclk->enable + CLKGATE_SEPERATED_STATUS);
45 spin_unlock_irqrestore(sclk->lock, flags);
49 static void clkgate_separated_disable(struct clk_hw *hw)
51 struct clkgate_separated *sclk;
52 unsigned long flags = 0;
55 sclk = container_of(hw, struct clkgate_separated, hw);
57 spin_lock_irqsave(sclk->lock, flags);
58 reg = BIT(sclk->bit_idx);
59 writel_relaxed(reg, sclk->enable + CLKGATE_SEPERATED_DISABLE);
60 readl_relaxed(sclk->enable + CLKGATE_SEPERATED_STATUS);
62 spin_unlock_irqrestore(sclk->lock, flags);
65 static int clkgate_separated_is_enabled(struct clk_hw *hw)
67 struct clkgate_separated *sclk;
70 sclk = container_of(hw, struct clkgate_separated, hw);
71 reg = readl_relaxed(sclk->enable + CLKGATE_SEPERATED_STATUS);
72 reg &= BIT(sclk->bit_idx);
77 static const struct clk_ops clkgate_separated_ops = {
78 .enable = clkgate_separated_enable,
79 .disable = clkgate_separated_disable,
80 .is_enabled = clkgate_separated_is_enabled,
83 struct clk *hisi_register_clkgate_sep(struct device *dev, const char *name,
84 const char *parent_name,
86 void __iomem *reg, u8 bit_idx,
87 u8 clk_gate_flags, spinlock_t *lock)
89 struct clkgate_separated *sclk;
91 struct clk_init_data init;
93 sclk = kzalloc(sizeof(*sclk), GFP_KERNEL);
95 return ERR_PTR(-ENOMEM);
98 init.ops = &clkgate_separated_ops;
100 init.parent_names = (parent_name ? &parent_name : NULL);
101 init.num_parents = (parent_name ? 1 : 0);
103 sclk->enable = reg + CLKGATE_SEPERATED_ENABLE;
104 sclk->bit_idx = bit_idx;
105 sclk->flags = clk_gate_flags;
106 sclk->hw.init = &init;
109 clk = clk_register(dev, &sclk->hw);