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author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2016-06-29 21:05:25 +0200 |
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committer | Michael Turquette <mturquette@baylibre.com> | 2016-07-08 18:04:38 -0700 |
commit | 1a7e7c388df10b2636e4ba18cc29ef740fbea6cc (patch) | |
tree | 2a8cb1c6544e3dd1e3d8f23992c3818b82629ddc /drivers/clk | |
parent | 89a3dfb787072438f72de95ff3fe7b58213e08c1 (diff) | |
download | linux-stable-1a7e7c388df10b2636e4ba18cc29ef740fbea6cc.tar.gz linux-stable-1a7e7c388df10b2636e4ba18cc29ef740fbea6cc.tar.bz2 linux-stable-1a7e7c388df10b2636e4ba18cc29ef740fbea6cc.zip |
clk: sunxi-ng: Add gate clock support
Some clocks in the Allwinner SoCs clocks unit are just simple gates. Add
support for those clocks.
Since it's a feature that can also be found in more complex clocks, provide
a bunch of helpers that can be reused later on.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/20160629190535.11855-5-maxime.ripard@free-electrons.com
Diffstat (limited to 'drivers/clk')
-rw-r--r-- | drivers/clk/sunxi-ng/Kconfig | 3 | ||||
-rw-r--r-- | drivers/clk/sunxi-ng/Makefile | 1 | ||||
-rw-r--r-- | drivers/clk/sunxi-ng/ccu_gate.c | 82 | ||||
-rw-r--r-- | drivers/clk/sunxi-ng/ccu_gate.h | 52 |
4 files changed, 138 insertions, 0 deletions
diff --git a/drivers/clk/sunxi-ng/Kconfig b/drivers/clk/sunxi-ng/Kconfig index 3d117d7a3621..2f135c8a61b6 100644 --- a/drivers/clk/sunxi-ng/Kconfig +++ b/drivers/clk/sunxi-ng/Kconfig @@ -9,4 +9,7 @@ if SUNXI_CCU config SUNXI_CCU_FRAC bool +config SUNXI_CCU_GATE + bool + endif diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile index 46f417cb682a..48b885f2d8ff 100644 --- a/drivers/clk/sunxi-ng/Makefile +++ b/drivers/clk/sunxi-ng/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_SUNXI_CCU) += ccu_reset.o # Base clock types obj-$(CONFIG_SUNXI_CCU_FRAC) += ccu_frac.o +obj-$(CONFIG_SUNXI_CCU_GATE) += ccu_gate.o diff --git a/drivers/clk/sunxi-ng/ccu_gate.c b/drivers/clk/sunxi-ng/ccu_gate.c new file mode 100644 index 000000000000..8a81f9d4a89f --- /dev/null +++ b/drivers/clk/sunxi-ng/ccu_gate.c @@ -0,0 +1,82 @@ +/* + * Copyright (C) 2016 Maxime Ripard + * Maxime Ripard <maxime.ripard@free-electrons.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + */ + +#include <linux/clk-provider.h> + +#include "ccu_gate.h" + +void ccu_gate_helper_disable(struct ccu_common *common, u32 gate) +{ + unsigned long flags; + u32 reg; + + if (!gate) + return; + + spin_lock_irqsave(common->lock, flags); + + reg = readl(common->base + common->reg); + writel(reg & ~gate, common->base + common->reg); + + spin_unlock_irqrestore(common->lock, flags); +} + +static void ccu_gate_disable(struct clk_hw *hw) +{ + struct ccu_gate *cg = hw_to_ccu_gate(hw); + + return ccu_gate_helper_disable(&cg->common, cg->enable); +} + +int ccu_gate_helper_enable(struct ccu_common *common, u32 gate) +{ + unsigned long flags; + u32 reg; + + if (!gate) + return 0; + + spin_lock_irqsave(common->lock, flags); + + reg = readl(common->base + common->reg); + writel(reg | gate, common->base + common->reg); + + spin_unlock_irqrestore(common->lock, flags); + + return 0; +} + +static int ccu_gate_enable(struct clk_hw *hw) +{ + struct ccu_gate *cg = hw_to_ccu_gate(hw); + + return ccu_gate_helper_enable(&cg->common, cg->enable); +} + +int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate) +{ + if (!gate) + return 1; + + return readl(common->base + common->reg) & gate; +} + +static int ccu_gate_is_enabled(struct clk_hw *hw) +{ + struct ccu_gate *cg = hw_to_ccu_gate(hw); + + return ccu_gate_helper_is_enabled(&cg->common, cg->enable); +} + +const struct clk_ops ccu_gate_ops = { + .disable = ccu_gate_disable, + .enable = ccu_gate_enable, + .is_enabled = ccu_gate_is_enabled, +}; diff --git a/drivers/clk/sunxi-ng/ccu_gate.h b/drivers/clk/sunxi-ng/ccu_gate.h new file mode 100644 index 000000000000..4466169bd2d7 --- /dev/null +++ b/drivers/clk/sunxi-ng/ccu_gate.h @@ -0,0 +1,52 @@ +/* + * Copyright (c) 2016 Maxime Ripard. All rights reserved. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _CCU_GATE_H_ +#define _CCU_GATE_H_ + +#include <linux/clk-provider.h> + +#include "ccu_common.h" + +struct ccu_gate { + u32 enable; + + struct ccu_common common; +}; + +#define SUNXI_CCU_GATE(_struct, _name, _parent, _reg, _gate, _flags) \ + struct ccu_gate _struct = { \ + .enable = _gate, \ + .common = { \ + .reg = _reg, \ + .hw.init = CLK_HW_INIT(_name, \ + _parent, \ + &ccu_gate_ops, \ + _flags), \ + } \ + } + +static inline struct ccu_gate *hw_to_ccu_gate(struct clk_hw *hw) +{ + struct ccu_common *common = hw_to_ccu_common(hw); + + return container_of(common, struct ccu_gate, common); +} + +void ccu_gate_helper_disable(struct ccu_common *common, u32 gate); +int ccu_gate_helper_enable(struct ccu_common *common, u32 gate); +int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate); + +extern const struct clk_ops ccu_gate_ops; + +#endif /* _CCU_GATE_H_ */ |