diff mbox series

[RESEND,v7,1/4] clk: meson: add emmc sub clock phase delay driver

Message ID 1544457877-51301-2-git-send-email-jianxin.pan@amlogic.com (mailing list archive)
State New, archived
Headers show
Series clk: meson: add a sub EMMC clock controller support | expand

Commit Message

Jianxin Pan Dec. 10, 2018, 4:04 p.m. UTC 
From: Yixun Lan <yixun.lan@amlogic.com>

Export the emmc sub clock phase delay ops which will be used
by the emmc sub clock driver itself.

Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com>
---
 drivers/clk/meson/Makefile          |  2 +-
 drivers/clk/meson/clk-phase-delay.c | 64 +++++++++++++++++++++++++++++++++++++
 drivers/clk/meson/clkc.h            | 13 ++++++++
 3 files changed, 78 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/meson/clk-phase-delay.c

Comments

Jerome Brunet Dec. 11, 2018, 4:28 p.m. UTC | #1 
On Tue, 2018-12-11 at 00:04 +0800, Jianxin Pan wrote:
> From: Yixun Lan <yixun.lan@amlogic.com>
> 
> Export the emmc sub clock phase delay ops which will be used
> by the emmc sub clock driver itself.
> 
> Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
> Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com>
> ---
>  drivers/clk/meson/Makefile          |  2 +-
>  drivers/clk/meson/clk-phase-delay.c | 64
> +++++++++++++++++++++++++++++++++++++
>  drivers/clk/meson/clkc.h            | 13 ++++++++
>  3 files changed, 78 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/clk/meson/clk-phase-delay.c
> 
> diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
> index 72ec8c4..39ce566 100644
> --- a/drivers/clk/meson/Makefile
> +++ b/drivers/clk/meson/Makefile
> @@ -2,7 +2,7 @@
>  # Makefile for Meson specific clk
>  #
>  
> -obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-phase.o
> +obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-phase.o clk-
> phase-delay.o
>  obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO)	+= clk-triphase.o sclk-div.o
>  obj-$(CONFIG_COMMON_CLK_MESON_AO) += meson-aoclk.o
>  obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o
> diff --git a/drivers/clk/meson/clk-phase-delay.c b/drivers/clk/meson/clk-
> phase-delay.c
> new file mode 100644
> index 0000000..84e7b63
> --- /dev/null
> +++ b/drivers/clk/meson/clk-phase-delay.c
> @@ -0,0 +1,64 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Amlogic Meson MMC Sub Clock Controller Driver
> + *
> + * Copyright (c) 2017 Baylibre SAS.
> + * Author: Jerome Brunet <jbrunet@baylibre.com>
> + *
> + * Copyright (c) 2018 Amlogic, inc.
> + * Author: Yixun Lan <yixun.lan@amlogic.com>
> + * Author: Jianxin Pan <jianxin.pan@amlogic.com>
> + */
> +
> +#include <linux/clk-provider.h>
> +#include "clkc.h"
> +
> +static int meson_clk_phase_delay_get_phase(struct clk_hw *hw)
> +{
> +	struct clk_regmap *clk = to_clk_regmap(hw);
> +	struct meson_clk_phase_delay_data *ph;
> +	unsigned long period_ps, p, d;
> +	int degrees;
> +
> +	ph = meson_clk_get_phase_delay_data(clk);
> +	p = meson_parm_read(clk->map, &ph->phase);
> +	degrees = p * 360 / (1 << (ph->phase.width));
> +
> +	period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000,
> +				 clk_hw_get_rate(hw));
> +
> +	d = meson_parm_read(clk->map, &ph->delay);
> +	degrees += d * ph->delay_step_ps * 360 / period_ps;
> +	degrees %= 360;
> +
> +	return degrees;
> +}
> +
> +static int meson_clk_phase_delay_set_phase(struct clk_hw *hw, int degrees)
> +{
> +	struct clk_regmap *clk = to_clk_regmap(hw);
> +	struct meson_clk_phase_delay_data *ph;
> +	unsigned long period_ps, d = 0, r;
> +
> +	ph = meson_clk_get_phase_delay_data(clk);
> +	period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000, clk_hw_get_rate(hw));
> +
> +	/*
> +	 * First compute the phase index (p), the remainder (r) is the
> +	 * part we'll try to acheive using the delays (d).
> +	 */
> +	r = do_div(degrees, 360 / 1 << (ph->phase.width));
> +	d = DIV_ROUND_CLOSEST(r * period_ps,
> +			      360 * ph->delay_step_ps);
> +	d = min(d, PMASK(ph->delay.width));
> +
> +	meson_parm_write(clk->map, &ph->phase, degrees);
> +	meson_parm_write(clk->map, &ph->delay, d);
> +	return 0;
> +}
> +
> +const struct clk_ops meson_clk_phase_delay_ops = {
> +	.get_phase = meson_clk_phase_delay_get_phase,
> +	.set_phase = meson_clk_phase_delay_set_phase,
> +};
> +EXPORT_SYMBOL_GPL(meson_clk_phase_delay_ops);
> diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h
> index 6b96d55..30470c6 100644
> --- a/drivers/clk/meson/clkc.h
> +++ b/drivers/clk/meson/clkc.h
> @@ -105,6 +105,18 @@ struct clk_regmap _name = {				
> 		\
>  	},								\
>  };
>  
> +struct meson_clk_phase_delay_data {
> +	struct parm			phase;
> +	struct parm			delay;
> +	unsigned int			delay_step_ps;
> +};
> +
> +static inline struct meson_clk_phase_delay_data *
> +meson_clk_get_phase_delay_data(struct clk_regmap *clk)
> +{
> +	return clk->data;
> +}

This is only usefull in the related clock driver, no need to export it

> +
>  /* clk_ops */
>  extern const struct clk_ops meson_clk_pll_ro_ops;
>  extern const struct clk_ops meson_clk_pll_ops;
> @@ -112,5 +124,6 @@ struct clk_regmap _name = {				
> 		\
>  extern const struct clk_ops meson_clk_mpll_ro_ops;
>  extern const struct clk_ops meson_clk_mpll_ops;
>  extern const struct clk_ops meson_clk_phase_ops;
> +extern const struct clk_ops meson_clk_phase_delay_ops;
>  
>  #endif /* __CLKC_H */
Jianxin Pan Dec. 13, 2018, 4:42 a.m. UTC | #2 
HI Jerome,

On 2018/12/12 0:28, Jerome Brunet wrote:
> On Tue, 2018-12-11 at 00:04 +0800, Jianxin Pan wrote:
>> From: Yixun Lan <yixun.lan@amlogic.com>
>>
[...]
>> +
>> +static inline struct meson_clk_phase_delay_data *
>> +meson_clk_get_phase_delay_data(struct clk_regmap *clk)
>> +{
>> +	return clk->data;
>> +}
> 
> This is only usefull in the related clock driver, no need to export it
OK, I will move it to clk-phase-delay.c.
Thanks for the review.
> 
>> +
>>  /* clk_ops */
>>  extern const struct clk_ops meson_clk_pll_ro_ops;
>>  extern const struct clk_ops meson_clk_pll_ops;
>> @@ -112,5 +124,6 @@ struct clk_regmap _name = {				
>> 		\
>>  extern const struct clk_ops meson_clk_mpll_ro_ops;
>>  extern const struct clk_ops meson_clk_mpll_ops;
>>  extern const struct clk_ops meson_clk_phase_ops;
>> +extern const struct clk_ops meson_clk_phase_delay_ops;
>>  
>>  #endif /* __CLKC_H */
> 
> 
> .
>
diff mbox series

Patch

diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
index 72ec8c4..39ce566 100644
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile
@@ -2,7 +2,7 @@ 
 # Makefile for Meson specific clk
 #
 
-obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-phase.o
+obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-phase.o clk-phase-delay.o
 obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO)	+= clk-triphase.o sclk-div.o
 obj-$(CONFIG_COMMON_CLK_MESON_AO) += meson-aoclk.o
 obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o
diff --git a/drivers/clk/meson/clk-phase-delay.c b/drivers/clk/meson/clk-phase-delay.c
new file mode 100644
index 0000000..84e7b63
--- /dev/null
+++ b/drivers/clk/meson/clk-phase-delay.c
@@ -0,0 +1,64 @@ 
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Amlogic Meson MMC Sub Clock Controller Driver
+ *
+ * Copyright (c) 2017 Baylibre SAS.
+ * Author: Jerome Brunet <jbrunet@baylibre.com>
+ *
+ * Copyright (c) 2018 Amlogic, inc.
+ * Author: Yixun Lan <yixun.lan@amlogic.com>
+ * Author: Jianxin Pan <jianxin.pan@amlogic.com>
+ */
+
+#include <linux/clk-provider.h>
+#include "clkc.h"
+
+static int meson_clk_phase_delay_get_phase(struct clk_hw *hw)
+{
+	struct clk_regmap *clk = to_clk_regmap(hw);
+	struct meson_clk_phase_delay_data *ph;
+	unsigned long period_ps, p, d;
+	int degrees;
+
+	ph = meson_clk_get_phase_delay_data(clk);
+	p = meson_parm_read(clk->map, &ph->phase);
+	degrees = p * 360 / (1 << (ph->phase.width));
+
+	period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000,
+				 clk_hw_get_rate(hw));
+
+	d = meson_parm_read(clk->map, &ph->delay);
+	degrees += d * ph->delay_step_ps * 360 / period_ps;
+	degrees %= 360;
+
+	return degrees;
+}
+
+static int meson_clk_phase_delay_set_phase(struct clk_hw *hw, int degrees)
+{
+	struct clk_regmap *clk = to_clk_regmap(hw);
+	struct meson_clk_phase_delay_data *ph;
+	unsigned long period_ps, d = 0, r;
+
+	ph = meson_clk_get_phase_delay_data(clk);
+	period_ps = DIV_ROUND_UP(NSEC_PER_SEC * 1000, clk_hw_get_rate(hw));
+
+	/*
+	 * First compute the phase index (p), the remainder (r) is the
+	 * part we'll try to acheive using the delays (d).
+	 */
+	r = do_div(degrees, 360 / 1 << (ph->phase.width));
+	d = DIV_ROUND_CLOSEST(r * period_ps,
+			      360 * ph->delay_step_ps);
+	d = min(d, PMASK(ph->delay.width));
+
+	meson_parm_write(clk->map, &ph->phase, degrees);
+	meson_parm_write(clk->map, &ph->delay, d);
+	return 0;
+}
+
+const struct clk_ops meson_clk_phase_delay_ops = {
+	.get_phase = meson_clk_phase_delay_get_phase,
+	.set_phase = meson_clk_phase_delay_set_phase,
+};
+EXPORT_SYMBOL_GPL(meson_clk_phase_delay_ops);
diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h
index 6b96d55..30470c6 100644
--- a/drivers/clk/meson/clkc.h
+++ b/drivers/clk/meson/clkc.h
@@ -105,6 +105,18 @@  struct clk_regmap _name = {						\
 	},								\
 };
 
+struct meson_clk_phase_delay_data {
+	struct parm			phase;
+	struct parm			delay;
+	unsigned int			delay_step_ps;
+};
+
+static inline struct meson_clk_phase_delay_data *
+meson_clk_get_phase_delay_data(struct clk_regmap *clk)
+{
+	return clk->data;
+}
+
 /* clk_ops */
 extern const struct clk_ops meson_clk_pll_ro_ops;
 extern const struct clk_ops meson_clk_pll_ops;
@@ -112,5 +124,6 @@  struct clk_regmap _name = {						\
 extern const struct clk_ops meson_clk_mpll_ro_ops;
 extern const struct clk_ops meson_clk_mpll_ops;
 extern const struct clk_ops meson_clk_phase_ops;
+extern const struct clk_ops meson_clk_phase_delay_ops;
 
 #endif /* __CLKC_H */