linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Maxime Ripard <maxime.ripard@free-electrons.com>
To: Mike Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@codeaurora.org>, Chen-Yu Tsai <wens@csie.org>
Cc: linux-clk@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>,
	Andre Przywara <andre.przywara@arm.com>,
	Rob Herring <robh+dt@kernel.org>,
	Vishnu Patekar <vishnupatekar0510@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	Boris Brezillon <boris.brezillon@free-electrons.com>,
	Jean-Francois Moine <moinejf@free.fr>,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	Maxime Ripard <maxime.ripard@free-electrons.com>
Subject: [PATCH v2 05/15] clk: sunxi-ng: Add gate clock support
Date: Tue,  7 Jun 2016 22:41:44 +0200	[thread overview]
Message-ID: <20160607204154.31967-6-maxime.ripard@free-electrons.com> (raw)
In-Reply-To: <20160607204154.31967-1-maxime.ripard@free-electrons.com>

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>
---
 drivers/clk/sunxi-ng/Makefile   |  1 +
 drivers/clk/sunxi-ng/ccu_gate.c | 82 +++++++++++++++++++++++++++++++++++++++++
 drivers/clk/sunxi-ng/ccu_gate.h | 53 ++++++++++++++++++++++++++
 3 files changed, 136 insertions(+)
 create mode 100644 drivers/clk/sunxi-ng/ccu_gate.c
 create mode 100644 drivers/clk/sunxi-ng/ccu_gate.h

diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile
index c59cf2ea509b..608b332e0b1f 100644
--- a/drivers/clk/sunxi-ng/Makefile
+++ b/drivers/clk/sunxi-ng/Makefile
@@ -4,3 +4,4 @@ obj-y += ccu_reset.o
 obj-y += ccu_frac.o
 
 obj-y += ccu_fixed_factor.o
+obj-y += 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..1e98f8a33ac3
--- /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 (!(common->features & CCU_FEATURE_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 (!(common->features & CCU_FEATURE_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 (!(common->features & CCU_FEATURE_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..8e15fa17bcc1
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_gate.h
@@ -0,0 +1,53 @@
+/*
+ * 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,				\
+			.features	= CCU_FEATURE_GATE,		\
+			.hw.init	= SUNXI_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_ */
-- 
2.8.3

  parent reply	other threads:[~2016-06-07 20:42 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-07 20:41 [PATCH v2 00/15] clk: sunxi: introduce "modern" clock support Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 01/15] dt-bindings: sunxi: Add CCU binding documentation Maxime Ripard
2016-06-08  1:37   ` Chen-Yu Tsai
2016-06-07 20:41 ` [PATCH v2 02/15] clk: sunxi-ng: Add common infrastructure Maxime Ripard
2016-06-09  7:39   ` Jean-Francois Moine
2016-06-07 20:41 ` [PATCH v2 03/15] clk: sunxi-ng: Add fractional lib Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 04/15] clk: sunxi-ng: Add fixed factor clock support Maxime Ripard
2016-06-21  1:15   ` Stephen Boyd
2016-06-21  9:24     ` Maxime Ripard
2016-06-07 20:41 ` Maxime Ripard [this message]
2016-06-09  7:39   ` [PATCH v2 05/15] clk: sunxi-ng: Add gate " Jean-Francois Moine
2016-06-07 20:41 ` [PATCH v2 06/15] clk: sunxi-ng: Add mux " Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 07/15] clk: sunxi-ng: Add phase " Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 08/15] clk: sunxi-ng: Add divider Maxime Ripard
2016-06-09  7:40   ` Jean-Francois Moine
2016-06-11  8:27   ` Jean-Francois Moine
2016-06-07 20:41 ` [PATCH v2 09/15] clk: sunxi-ng: Add M-P factor clock support Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 10/15] clk: sunxi-ng: Add N-K-factor " Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 11/15] clk: sunxi-ng: Add N-M-factor " Maxime Ripard
2016-06-09  7:41   ` Jean-Francois Moine
2016-06-27 20:29     ` Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 12/15] clk: sunxi-ng: Add N-K-M Factor clock Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 13/15] clk: sunxi-ng: Add N-K-M-P factor clock Maxime Ripard
2016-06-21  1:42   ` Stephen Boyd
2016-06-07 20:41 ` [PATCH v2 14/15] clk: sunxi-ng: Add H3 clocks Maxime Ripard
2016-06-09  7:42   ` Jean-Francois Moine
2016-06-25  0:28   ` Michael Turquette
2016-06-26 12:34     ` Maxime Ripard
     [not found]       ` <146707521689.89261.8354851392822550901@resonance>
2016-06-28  8:32         ` Maxime Ripard
2016-06-07 20:41 ` [PATCH v2 15/15] ARM: dt: sun8i: switch the H3 to the new CCU driver Maxime Ripard
2016-06-21  1:48 ` [PATCH v2 00/15] clk: sunxi: introduce "modern" clock support Stephen Boyd
2016-06-26 16:24   ` Maxime Ripard
2016-06-21  9:40 ` Jean-Francois Moine
2016-06-21 14:47   ` Maxime Ripard
2016-06-21 18:29     ` Jean-Francois Moine
2016-06-27 20:46       ` Maxime Ripard

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20160607204154.31967-6-maxime.ripard@free-electrons.com \
    --to=maxime.ripard@free-electrons.com \
    --cc=andre.przywara@arm.com \
    --cc=boris.brezillon@free-electrons.com \
    --cc=devicetree@vger.kernel.org \
    --cc=hdegoede@redhat.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-clk@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=moinejf@free.fr \
    --cc=mturquette@baylibre.com \
    --cc=robh+dt@kernel.org \
    --cc=sboyd@codeaurora.org \
    --cc=vishnupatekar0510@gmail.com \
    --cc=wens@csie.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).