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[1/2] clk: uniphier: add CPU-gear change (cpufreq) support

Message ID 1477503088-26508-1-git-send-email-yamada.masahiro@socionext.com (mailing list archive)
State New, archived
Headers show

Commit Message

Masahiro Yamada Oct. 26, 2016, 5:31 p.m. UTC 
Core support code for CPU frequency changes, which will be used by
the generic cpufreq driver.

The register view is different from the generic clk-mux; it has
a separate status register, and an update bit to load the register
setting.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

 drivers/clk/uniphier/Makefile               |   3 +
 drivers/clk/uniphier/clk-uniphier-core.c    |   3 +
 drivers/clk/uniphier/clk-uniphier-cpugear.c | 115 ++++++++++++++++++++++++++++
 drivers/clk/uniphier/clk-uniphier.h         |  17 +++-
 4 files changed, 136 insertions(+), 2 deletions(-)
 create mode 100644 drivers/clk/uniphier/clk-uniphier-cpugear.c

Comments

Masahiro Yamada Nov. 23, 2016, 1:14 a.m. UTC | #1 
Hi Stephen,


Ping.



2016-10-27 2:31 GMT+09:00 Masahiro Yamada <yamada.masahiro@socionext.com>:
> Core support code for CPU frequency changes, which will be used by
> the generic cpufreq driver.
>
> The register view is different from the generic clk-mux; it has
> a separate status register, and an update bit to load the register
> setting.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---
>
>  drivers/clk/uniphier/Makefile               |   3 +
>  drivers/clk/uniphier/clk-uniphier-core.c    |   3 +
>  drivers/clk/uniphier/clk-uniphier-cpugear.c | 115 ++++++++++++++++++++++++++++
>  drivers/clk/uniphier/clk-uniphier.h         |  17 +++-
>  4 files changed, 136 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/clk/uniphier/clk-uniphier-cpugear.c
>
> diff --git a/drivers/clk/uniphier/Makefile b/drivers/clk/uniphier/Makefile
> index f27b3603..665d1d6 100644
> --- a/drivers/clk/uniphier/Makefile
> +++ b/drivers/clk/uniphier/Makefile
> @@ -1,8 +1,11 @@
>  obj-y  += clk-uniphier-core.o
> +
> +obj-y  += clk-uniphier-cpugear.o
>  obj-y  += clk-uniphier-fixed-factor.o
>  obj-y  += clk-uniphier-fixed-rate.o
>  obj-y  += clk-uniphier-gate.o
>  obj-y  += clk-uniphier-mux.o
> +
>  obj-y  += clk-uniphier-sys.o
>  obj-y  += clk-uniphier-mio.o
>  obj-y  += clk-uniphier-peri.o
> diff --git a/drivers/clk/uniphier/clk-uniphier-core.c b/drivers/clk/uniphier/clk-uniphier-core.c
> index 26c53f7..0007218 100644
> --- a/drivers/clk/uniphier/clk-uniphier-core.c
> +++ b/drivers/clk/uniphier/clk-uniphier-core.c
> @@ -27,6 +27,9 @@ static struct clk_hw *uniphier_clk_register(struct device *dev,
>                                         const struct uniphier_clk_data *data)
>  {
>         switch (data->type) {
> +       case UNIPHIER_CLK_TYPE_CPUGEAR:
> +               return uniphier_clk_register_cpugear(dev, regmap, data->name,
> +                                                    &data->data.cpugear);
>         case UNIPHIER_CLK_TYPE_FIXED_FACTOR:
>                 return uniphier_clk_register_fixed_factor(dev, data->name,
>                                                           &data->data.factor);
> diff --git a/drivers/clk/uniphier/clk-uniphier-cpugear.c b/drivers/clk/uniphier/clk-uniphier-cpugear.c
> new file mode 100644
> index 0000000..9bff26e
> --- /dev/null
> +++ b/drivers/clk/uniphier/clk-uniphier-cpugear.c
> @@ -0,0 +1,115 @@
> +/*
> + * Copyright (C) 2016 Socionext Inc.
> + *   Author: Masahiro Yamada <yamada.masahiro@socionext.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.
> + *
> + * 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.
> + */
> +
> +#include <linux/clk-provider.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/regmap.h>
> +
> +#include "clk-uniphier.h"
> +
> +#define UNIPHIER_CLK_CPUGEAR_STAT      0       /* status */
> +#define UNIPHIER_CLK_CPUGEAR_SET       4       /* set */
> +#define UNIPHIER_CLK_CPUGEAR_UPD       8       /* update */
> +#define   UNIPHIER_CLK_CPUGEAR_UPD_BIT BIT(0)
> +
> +struct uniphier_clk_cpugear {
> +       struct clk_hw hw;
> +       struct regmap *regmap;
> +       unsigned int regbase;
> +       unsigned int mask;
> +};
> +
> +#define to_uniphier_clk_cpugear(_hw) \
> +                       container_of(_hw, struct uniphier_clk_cpugear, hw)
> +
> +static int uniphier_clk_cpugear_set_parent(struct clk_hw *hw, u8 index)
> +{
> +       struct uniphier_clk_cpugear *gear = to_uniphier_clk_cpugear(hw);
> +       int ret;
> +       unsigned int val;
> +
> +       ret = regmap_write_bits(gear->regmap,
> +                               gear->regbase + UNIPHIER_CLK_CPUGEAR_SET,
> +                               gear->mask, index);
> +       if (ret)
> +               return ret;
> +
> +       ret = regmap_write_bits(gear->regmap,
> +                               gear->regbase + UNIPHIER_CLK_CPUGEAR_SET,
> +                               UNIPHIER_CLK_CPUGEAR_UPD_BIT,
> +                               UNIPHIER_CLK_CPUGEAR_UPD_BIT);
> +       if (ret)
> +               return ret;
> +
> +       return regmap_read_poll_timeout(gear->regmap,
> +                               gear->regbase + UNIPHIER_CLK_CPUGEAR_UPD,
> +                               val, !(val & UNIPHIER_CLK_CPUGEAR_UPD_BIT),
> +                               0, 1);
> +}
> +
> +static u8 uniphier_clk_cpugear_get_parent(struct clk_hw *hw)
> +{
> +       struct uniphier_clk_cpugear *gear = to_uniphier_clk_cpugear(hw);
> +       int num_parents = clk_hw_get_num_parents(hw);
> +       int ret;
> +       unsigned int val;
> +
> +       ret = regmap_read(gear->regmap,
> +                         gear->regbase + UNIPHIER_CLK_CPUGEAR_STAT, &val);
> +       if (ret)
> +               return ret;
> +
> +       val &= gear->mask;
> +
> +       return val < num_parents ? val : -EINVAL;
> +}
> +
> +static const struct clk_ops uniphier_clk_cpugear_ops = {
> +       .determine_rate = __clk_mux_determine_rate,
> +       .set_parent = uniphier_clk_cpugear_set_parent,
> +       .get_parent = uniphier_clk_cpugear_get_parent,
> +};
> +
> +struct clk_hw *uniphier_clk_register_cpugear(struct device *dev,
> +                                        struct regmap *regmap,
> +                                        const char *name,
> +                               const struct uniphier_clk_cpugear_data *data)
> +{
> +       struct uniphier_clk_cpugear *gear;
> +       struct clk_init_data init;
> +       int ret;
> +
> +       gear = devm_kzalloc(dev, sizeof(*gear), GFP_KERNEL);
> +       if (!gear)
> +               return ERR_PTR(-ENOMEM);
> +
> +       init.name = name;
> +       init.ops = &uniphier_clk_cpugear_ops;
> +       init.flags = CLK_SET_RATE_PARENT;
> +       init.parent_names = data->parent_names;
> +       init.num_parents = data->num_parents,
> +
> +       gear->regmap = regmap;
> +       gear->regbase = data->regbase;
> +       gear->mask = data->mask;
> +       gear->hw.init = &init;
> +
> +       ret = devm_clk_hw_register(dev, &gear->hw);
> +       if (ret)
> +               return ERR_PTR(ret);
> +
> +       return &gear->hw;
> +}
> diff --git a/drivers/clk/uniphier/clk-uniphier.h b/drivers/clk/uniphier/clk-uniphier.h
> index 0244dba..9707b0f 100644
> --- a/drivers/clk/uniphier/clk-uniphier.h
> +++ b/drivers/clk/uniphier/clk-uniphier.h
> @@ -20,15 +20,24 @@
>  struct device;
>  struct regmap;
>
> -#define UNIPHIER_CLK_MUX_MAX_PARENTS   8
> +#define UNIPHIER_CLK_CPUGEAR_MAX_PARENTS       16
> +#define UNIPHIER_CLK_MUX_MAX_PARENTS           8
>
>  enum uniphier_clk_type {
> +       UNIPHIER_CLK_TYPE_CPUGEAR,
>         UNIPHIER_CLK_TYPE_FIXED_FACTOR,
>         UNIPHIER_CLK_TYPE_FIXED_RATE,
>         UNIPHIER_CLK_TYPE_GATE,
>         UNIPHIER_CLK_TYPE_MUX,
>  };
>
> +struct uniphier_clk_cpugear_data {
> +       const char *parent_names[UNIPHIER_CLK_CPUGEAR_MAX_PARENTS];
> +       unsigned int num_parents;
> +       unsigned int regbase;
> +       unsigned int mask;
> +};
> +
>  struct uniphier_clk_fixed_factor_data {
>         const char *parent_name;
>         unsigned int mult;
> @@ -58,6 +67,7 @@ struct uniphier_clk_data {
>         enum uniphier_clk_type type;
>         int idx;
>         union {
> +               struct uniphier_clk_cpugear_data cpugear;
>                 struct uniphier_clk_fixed_factor_data factor;
>                 struct uniphier_clk_fixed_rate_data rate;
>                 struct uniphier_clk_gate_data gate;
> @@ -90,7 +100,10 @@ struct uniphier_clk_data {
>                 },                                              \
>         }
>
> -
> +struct clk_hw *uniphier_clk_register_cpugear(struct device *dev,
> +                                            struct regmap *regmap,
> +                                            const char *name,
> +                               const struct uniphier_clk_cpugear_data *data);
>  struct clk_hw *uniphier_clk_register_fixed_factor(struct device *dev,
>                                                   const char *name,
>                         const struct uniphier_clk_fixed_factor_data *data);
> --
> 1.9.1
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
diff mbox

Patch

diff --git a/drivers/clk/uniphier/Makefile b/drivers/clk/uniphier/Makefile
index f27b3603..665d1d6 100644
--- a/drivers/clk/uniphier/Makefile
+++ b/drivers/clk/uniphier/Makefile
@@ -1,8 +1,11 @@ 
 obj-y	+= clk-uniphier-core.o
+
+obj-y	+= clk-uniphier-cpugear.o
 obj-y	+= clk-uniphier-fixed-factor.o
 obj-y	+= clk-uniphier-fixed-rate.o
 obj-y	+= clk-uniphier-gate.o
 obj-y	+= clk-uniphier-mux.o
+
 obj-y	+= clk-uniphier-sys.o
 obj-y	+= clk-uniphier-mio.o
 obj-y	+= clk-uniphier-peri.o
diff --git a/drivers/clk/uniphier/clk-uniphier-core.c b/drivers/clk/uniphier/clk-uniphier-core.c
index 26c53f7..0007218 100644
--- a/drivers/clk/uniphier/clk-uniphier-core.c
+++ b/drivers/clk/uniphier/clk-uniphier-core.c
@@ -27,6 +27,9 @@  static struct clk_hw *uniphier_clk_register(struct device *dev,
 					const struct uniphier_clk_data *data)
 {
 	switch (data->type) {
+	case UNIPHIER_CLK_TYPE_CPUGEAR:
+		return uniphier_clk_register_cpugear(dev, regmap, data->name,
+						     &data->data.cpugear);
 	case UNIPHIER_CLK_TYPE_FIXED_FACTOR:
 		return uniphier_clk_register_fixed_factor(dev, data->name,
 							  &data->data.factor);
diff --git a/drivers/clk/uniphier/clk-uniphier-cpugear.c b/drivers/clk/uniphier/clk-uniphier-cpugear.c
new file mode 100644
index 0000000..9bff26e
--- /dev/null
+++ b/drivers/clk/uniphier/clk-uniphier-cpugear.c
@@ -0,0 +1,115 @@ 
+/*
+ * Copyright (C) 2016 Socionext Inc.
+ *   Author: Masahiro Yamada <yamada.masahiro@socionext.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.
+ *
+ * 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.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+
+#include "clk-uniphier.h"
+
+#define UNIPHIER_CLK_CPUGEAR_STAT	0	/* status */
+#define UNIPHIER_CLK_CPUGEAR_SET	4	/* set */
+#define UNIPHIER_CLK_CPUGEAR_UPD	8	/* update */
+#define   UNIPHIER_CLK_CPUGEAR_UPD_BIT	BIT(0)
+
+struct uniphier_clk_cpugear {
+	struct clk_hw hw;
+	struct regmap *regmap;
+	unsigned int regbase;
+	unsigned int mask;
+};
+
+#define to_uniphier_clk_cpugear(_hw) \
+			container_of(_hw, struct uniphier_clk_cpugear, hw)
+
+static int uniphier_clk_cpugear_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct uniphier_clk_cpugear *gear = to_uniphier_clk_cpugear(hw);
+	int ret;
+	unsigned int val;
+
+	ret = regmap_write_bits(gear->regmap,
+				gear->regbase + UNIPHIER_CLK_CPUGEAR_SET,
+				gear->mask, index);
+	if (ret)
+		return ret;
+
+	ret = regmap_write_bits(gear->regmap,
+				gear->regbase + UNIPHIER_CLK_CPUGEAR_SET,
+				UNIPHIER_CLK_CPUGEAR_UPD_BIT,
+				UNIPHIER_CLK_CPUGEAR_UPD_BIT);
+	if (ret)
+		return ret;
+
+	return regmap_read_poll_timeout(gear->regmap,
+				gear->regbase + UNIPHIER_CLK_CPUGEAR_UPD,
+				val, !(val & UNIPHIER_CLK_CPUGEAR_UPD_BIT),
+				0, 1);
+}
+
+static u8 uniphier_clk_cpugear_get_parent(struct clk_hw *hw)
+{
+	struct uniphier_clk_cpugear *gear = to_uniphier_clk_cpugear(hw);
+	int num_parents = clk_hw_get_num_parents(hw);
+	int ret;
+	unsigned int val;
+
+	ret = regmap_read(gear->regmap,
+			  gear->regbase + UNIPHIER_CLK_CPUGEAR_STAT, &val);
+	if (ret)
+		return ret;
+
+	val &= gear->mask;
+
+	return val < num_parents ? val : -EINVAL;
+}
+
+static const struct clk_ops uniphier_clk_cpugear_ops = {
+	.determine_rate = __clk_mux_determine_rate,
+	.set_parent = uniphier_clk_cpugear_set_parent,
+	.get_parent = uniphier_clk_cpugear_get_parent,
+};
+
+struct clk_hw *uniphier_clk_register_cpugear(struct device *dev,
+					 struct regmap *regmap,
+					 const char *name,
+				const struct uniphier_clk_cpugear_data *data)
+{
+	struct uniphier_clk_cpugear *gear;
+	struct clk_init_data init;
+	int ret;
+
+	gear = devm_kzalloc(dev, sizeof(*gear), GFP_KERNEL);
+	if (!gear)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &uniphier_clk_cpugear_ops;
+	init.flags = CLK_SET_RATE_PARENT;
+	init.parent_names = data->parent_names;
+	init.num_parents = data->num_parents,
+
+	gear->regmap = regmap;
+	gear->regbase = data->regbase;
+	gear->mask = data->mask;
+	gear->hw.init = &init;
+
+	ret = devm_clk_hw_register(dev, &gear->hw);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return &gear->hw;
+}
diff --git a/drivers/clk/uniphier/clk-uniphier.h b/drivers/clk/uniphier/clk-uniphier.h
index 0244dba..9707b0f 100644
--- a/drivers/clk/uniphier/clk-uniphier.h
+++ b/drivers/clk/uniphier/clk-uniphier.h
@@ -20,15 +20,24 @@ 
 struct device;
 struct regmap;
 
-#define UNIPHIER_CLK_MUX_MAX_PARENTS	8
+#define UNIPHIER_CLK_CPUGEAR_MAX_PARENTS	16
+#define UNIPHIER_CLK_MUX_MAX_PARENTS		8
 
 enum uniphier_clk_type {
+	UNIPHIER_CLK_TYPE_CPUGEAR,
 	UNIPHIER_CLK_TYPE_FIXED_FACTOR,
 	UNIPHIER_CLK_TYPE_FIXED_RATE,
 	UNIPHIER_CLK_TYPE_GATE,
 	UNIPHIER_CLK_TYPE_MUX,
 };
 
+struct uniphier_clk_cpugear_data {
+	const char *parent_names[UNIPHIER_CLK_CPUGEAR_MAX_PARENTS];
+	unsigned int num_parents;
+	unsigned int regbase;
+	unsigned int mask;
+};
+
 struct uniphier_clk_fixed_factor_data {
 	const char *parent_name;
 	unsigned int mult;
@@ -58,6 +67,7 @@  struct uniphier_clk_data {
 	enum uniphier_clk_type type;
 	int idx;
 	union {
+		struct uniphier_clk_cpugear_data cpugear;
 		struct uniphier_clk_fixed_factor_data factor;
 		struct uniphier_clk_fixed_rate_data rate;
 		struct uniphier_clk_gate_data gate;
@@ -90,7 +100,10 @@  struct uniphier_clk_data {
 		},						\
 	}
 
-
+struct clk_hw *uniphier_clk_register_cpugear(struct device *dev,
+					     struct regmap *regmap,
+					     const char *name,
+				const struct uniphier_clk_cpugear_data *data);
 struct clk_hw *uniphier_clk_register_fixed_factor(struct device *dev,
 						  const char *name,
 			const struct uniphier_clk_fixed_factor_data *data);