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Message-ID: <1546955444-7549-3-git-send-email-jianxin.pan@amlogic.com>
Date: Tue, 8 Jan 2019 21:50:42 +0800
From: Jianxin Pan <jianxin.pan@...ogic.com>
To: Jerome Brunet <jbrunet@...libre.com>,
Neil Armstrong <narmstrong@...libre.com>
CC: Yixun Lan <yixun.lan@...ogic.com>,
Jianxin Pan <jianxin.pan@...ogic.com>,
Kevin Hilman <khilman@...libre.com>,
Carlo Caione <carlo@...one.org>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Boris Brezillon <boris.brezillon@...tlin.com>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
Liang Yang <liang.yang@...ogic.com>,
Jian Hu <jian.hu@...ogic.com>,
Qiufang Dai <qiufang.dai@...ogic.com>,
Hanjie Lin <hanjie.lin@...ogic.com>,
Victor Wan <victor.wan@...ogic.com>,
<linux-clk@...r.kernel.org>, <linux-amlogic@...ts.infradead.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH v9 2/4] clk: meson: add emmc sub clock phase delay driver
From: Yixun Lan <yixun.lan@...ogic.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@...ogic.com>
Signed-off-by: Jianxin Pan <jianxin.pan@...ogic.com>
---
drivers/clk/meson/Makefile | 1 +
drivers/clk/meson/clk-phase-delay.c | 73 +++++++++++++++++++++++++++++++++++++
drivers/clk/meson/clkc.h | 7 ++++
3 files changed, 81 insertions(+)
create mode 100644 drivers/clk/meson/clk-phase-delay.c
diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
index acd8694..d59620d 100644
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile
@@ -3,6 +3,7 @@
#
obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-phase.o vid-pll-div.o
+obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-phase-delay.o
obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-input.o
obj-$(CONFIG_COMMON_CLK_AMLOGIC) += sclk-div.o
obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.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..a6e6600
--- /dev/null
+++ b/drivers/clk/meson/clk-phase-delay.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Amlogic Meson MMC Sub Clock Controller Driver
+ *
+ * Copyright (c) 2017 Baylibre SAS.
+ * Author: Jerome Brunet <jbrunet@...libre.com>
+ *
+ * Copyright (c) 2018 Amlogic, inc.
+ * Author: Yixun Lan <yixun.lan@...ogic.com>
+ * Author: Jianxin Pan <jianxin.pan@...ogic.com>
+ */
+
+#include <linux/clk-provider.h>
+#include "clkc.h"
+
+static inline struct meson_clk_phase_delay_data *
+meson_clk_get_phase_delay_data(struct clk_regmap *clk)
+{
+ return clk->data;
+}
+
+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_ULL(NSEC_PER_SEC * 1000ull,
+ 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;
+ unsigned int p;
+
+ ph = meson_clk_get_phase_delay_data(clk);
+ period_ps = DIV_ROUND_UP_ULL(NSEC_PER_SEC * 1000ull,
+ 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).
+ */
+ p = 360 / 1 << (ph->phase.width);
+ degrees = degrees / p;
+ d = DIV_ROUND_CLOSEST((degrees % p) * 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 00b3320..e6f0905 100644
--- a/drivers/clk/meson/clkc.h
+++ b/drivers/clk/meson/clkc.h
@@ -118,6 +118,12 @@ struct clk_regmap _name = { \
}, \
};
+struct meson_clk_phase_delay_data {
+ struct parm phase;
+ struct parm delay;
+ unsigned int delay_step_ps;
+};
+
/* clk_ops */
extern const struct clk_ops meson_clk_pll_ro_ops;
extern const struct clk_ops meson_clk_pll_ops;
@@ -127,6 +133,7 @@ struct clk_regmap _name = { \
extern const struct clk_ops meson_clk_phase_ops;
extern const struct clk_ops meson_vid_pll_div_ro_ops;
extern const struct clk_ops meson_sclk_div_ops;
+extern const struct clk_ops meson_clk_phase_delay_ops;
struct clk_hw *meson_clk_hw_register_input(struct device *dev,
const char *of_name,
--
1.9.1
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