Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
116 lines
3.0 KiB
C
116 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016 Maxime Ripard
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*/
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#include <linux/clk-provider.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include "ccu_frac.h"
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bool ccu_frac_helper_is_enabled(struct ccu_common *common,
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struct ccu_frac_internal *cf)
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{
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if (!(common->features & CCU_FEATURE_FRACTIONAL))
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return false;
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return !(readl(common->base + common->reg) & cf->enable);
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}
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EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_is_enabled, "SUNXI_CCU");
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void ccu_frac_helper_enable(struct ccu_common *common,
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struct ccu_frac_internal *cf)
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{
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unsigned long flags;
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u32 reg;
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if (!(common->features & CCU_FEATURE_FRACTIONAL))
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return;
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spin_lock_irqsave(common->lock, flags);
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reg = readl(common->base + common->reg);
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writel(reg & ~cf->enable, common->base + common->reg);
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spin_unlock_irqrestore(common->lock, flags);
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}
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EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_enable, "SUNXI_CCU");
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void ccu_frac_helper_disable(struct ccu_common *common,
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struct ccu_frac_internal *cf)
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{
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unsigned long flags;
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u32 reg;
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if (!(common->features & CCU_FEATURE_FRACTIONAL))
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return;
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spin_lock_irqsave(common->lock, flags);
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reg = readl(common->base + common->reg);
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writel(reg | cf->enable, common->base + common->reg);
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spin_unlock_irqrestore(common->lock, flags);
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}
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EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_disable, "SUNXI_CCU");
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bool ccu_frac_helper_has_rate(struct ccu_common *common,
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struct ccu_frac_internal *cf,
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unsigned long rate)
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{
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if (!(common->features & CCU_FEATURE_FRACTIONAL))
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return false;
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return (cf->rates[0] == rate) || (cf->rates[1] == rate);
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}
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EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_has_rate, "SUNXI_CCU");
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unsigned long ccu_frac_helper_read_rate(struct ccu_common *common,
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struct ccu_frac_internal *cf)
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{
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u32 reg;
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pr_debug("%s: Read fractional\n", clk_hw_get_name(&common->hw));
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if (!(common->features & CCU_FEATURE_FRACTIONAL))
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return 0;
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pr_debug("%s: clock is fractional (rates %lu and %lu)\n",
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clk_hw_get_name(&common->hw), cf->rates[0], cf->rates[1]);
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reg = readl(common->base + common->reg);
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pr_debug("%s: clock reg is 0x%x (select is 0x%x)\n",
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clk_hw_get_name(&common->hw), reg, cf->select);
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return (reg & cf->select) ? cf->rates[1] : cf->rates[0];
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}
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EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_read_rate, "SUNXI_CCU");
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int ccu_frac_helper_set_rate(struct ccu_common *common,
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struct ccu_frac_internal *cf,
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unsigned long rate, u32 lock)
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{
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unsigned long flags;
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u32 reg, sel;
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if (!(common->features & CCU_FEATURE_FRACTIONAL))
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return -EINVAL;
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if (cf->rates[0] == rate)
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sel = 0;
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else if (cf->rates[1] == rate)
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sel = cf->select;
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else
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return -EINVAL;
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spin_lock_irqsave(common->lock, flags);
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reg = readl(common->base + common->reg);
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reg &= ~cf->select;
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writel(reg | sel, common->base + common->reg);
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spin_unlock_irqrestore(common->lock, flags);
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ccu_helper_wait_for_lock(common, lock);
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return 0;
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}
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EXPORT_SYMBOL_NS_GPL(ccu_frac_helper_set_rate, "SUNXI_CCU");
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