1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2016 Maxime Ripard
4 * Maxime Ripard <maxime.ripard@free-electrons.com>
7 #include <linux/clk-provider.h>
9 #include <linux/spinlock.h>
13 bool ccu_frac_helper_is_enabled(struct ccu_common *common,
14 struct ccu_frac_internal *cf)
16 if (!(common->features & CCU_FEATURE_FRACTIONAL))
19 return !(readl(common->base + common->reg) & cf->enable);
21 EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_is_enabled, SUNXI_CCU);
23 void ccu_frac_helper_enable(struct ccu_common *common,
24 struct ccu_frac_internal *cf)
29 if (!(common->features & CCU_FEATURE_FRACTIONAL))
32 spin_lock_irqsave(common->lock, flags);
33 reg = readl(common->base + common->reg);
34 writel(reg & ~cf->enable, common->base + common->reg);
35 spin_unlock_irqrestore(common->lock, flags);
37 EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_enable, SUNXI_CCU);
39 void ccu_frac_helper_disable(struct ccu_common *common,
40 struct ccu_frac_internal *cf)
45 if (!(common->features & CCU_FEATURE_FRACTIONAL))
48 spin_lock_irqsave(common->lock, flags);
49 reg = readl(common->base + common->reg);
50 writel(reg | cf->enable, common->base + common->reg);
51 spin_unlock_irqrestore(common->lock, flags);
53 EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_disable, SUNXI_CCU);
55 bool ccu_frac_helper_has_rate(struct ccu_common *common,
56 struct ccu_frac_internal *cf,
59 if (!(common->features & CCU_FEATURE_FRACTIONAL))
62 return (cf->rates[0] == rate) || (cf->rates[1] == rate);
64 EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_has_rate, SUNXI_CCU);
66 unsigned long ccu_frac_helper_read_rate(struct ccu_common *common,
67 struct ccu_frac_internal *cf)
71 pr_debug("%s: Read fractional\n", clk_hw_get_name(&common->hw));
73 if (!(common->features & CCU_FEATURE_FRACTIONAL))
76 pr_debug("%s: clock is fractional (rates %lu and %lu)\n",
77 clk_hw_get_name(&common->hw), cf->rates[0], cf->rates[1]);
79 reg = readl(common->base + common->reg);
81 pr_debug("%s: clock reg is 0x%x (select is 0x%x)\n",
82 clk_hw_get_name(&common->hw), reg, cf->select);
84 return (reg & cf->select) ? cf->rates[1] : cf->rates[0];
86 EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_read_rate, SUNXI_CCU);
88 int ccu_frac_helper_set_rate(struct ccu_common *common,
89 struct ccu_frac_internal *cf,
90 unsigned long rate, u32 lock)
95 if (!(common->features & CCU_FEATURE_FRACTIONAL))
98 if (cf->rates[0] == rate)
100 else if (cf->rates[1] == rate)
105 spin_lock_irqsave(common->lock, flags);
106 reg = readl(common->base + common->reg);
108 writel(reg | sel, common->base + common->reg);
109 spin_unlock_irqrestore(common->lock, flags);
111 ccu_helper_wait_for_lock(common, lock);
115 EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_set_rate, SUNXI_CCU);