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Subject[PATCH v5 09/12] clk: actions: Add fixed factor clock support
Date
Add support for Actions Semi fixed factor clock together with
helper functions to be used in composite clock.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
drivers/clk/actions/Makefile | 1 +
drivers/clk/actions/owl-fixed-factor.c | 81 ++++++++++++++++++++++++++++++++++
drivers/clk/actions/owl-fixed-factor.h | 62 ++++++++++++++++++++++++++
3 files changed, 144 insertions(+)
create mode 100644 drivers/clk/actions/owl-fixed-factor.c
create mode 100644 drivers/clk/actions/owl-fixed-factor.h

diff --git a/drivers/clk/actions/Makefile b/drivers/clk/actions/Makefile
index 994357fa560b..b618696ba54e 100644
--- a/drivers/clk/actions/Makefile
+++ b/drivers/clk/actions/Makefile
@@ -5,3 +5,4 @@ clk-owl-y += owl-gate.o
clk-owl-y += owl-mux.o
clk-owl-y += owl-divider.o
clk-owl-y += owl-factor.o
+clk-owl-y += owl-fixed-factor.o
diff --git a/drivers/clk/actions/owl-fixed-factor.c b/drivers/clk/actions/owl-fixed-factor.c
new file mode 100644
index 000000000000..f1281565129c
--- /dev/null
+++ b/drivers/clk/actions/owl-fixed-factor.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// OWL fixed factor clock driver
+//
+// Copyright (c) 2014 Actions Semi Inc.
+// Author: David Liu <liuwei@actions-semi.com>
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+#include <linux/clk-provider.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "owl-fixed-factor.h"
+
+long owl_fix_fact_helper_round_rate(struct owl_clk_common *common,
+ const struct owl_fix_fact_hw *fix_fact_hw,
+ unsigned long rate,
+ unsigned long *parent_rate)
+{
+ if (clk_hw_get_flags(&common->hw) & CLK_SET_RATE_PARENT) {
+ unsigned long best_parent;
+
+ best_parent = (rate / fix_fact_hw->mul) * fix_fact_hw->div;
+ *parent_rate = clk_hw_round_rate(clk_hw_get_parent(&common->hw),
+ best_parent);
+ }
+
+ return (*parent_rate / fix_fact_hw->div) * fix_fact_hw->mul;
+}
+
+static long owl_fix_fact_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct owl_fix_fact *fix_fact = hw_to_owl_fix_fact(hw);
+ struct owl_fix_fact_hw *fix_fact_hw = &fix_fact->fix_fact_hw;
+
+ return owl_fix_fact_helper_round_rate(&fix_fact->common, fix_fact_hw,
+ rate, parent_rate);
+}
+
+unsigned long owl_fix_fact_helper_recalc_rate(struct owl_clk_common *common,
+ const struct owl_fix_fact_hw *fix_fact_hw,
+ unsigned long parent_rate)
+{
+ unsigned long long int rate;
+
+ rate = (unsigned long long int)parent_rate * fix_fact_hw->mul;
+ do_div(rate, fix_fact_hw->div);
+
+ return (unsigned long)rate;
+}
+
+static unsigned long owl_fix_fact_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct owl_fix_fact *fix_fact = hw_to_owl_fix_fact(hw);
+ struct owl_fix_fact_hw *fix_fact_hw = &fix_fact->fix_fact_hw;
+
+ return owl_fix_fact_helper_recalc_rate(&fix_fact->common, fix_fact_hw,
+ parent_rate);
+}
+
+static int owl_fix_fact_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ /*
+ * We must report success but we can do so unconditionally because
+ * clk_fix_fact_round_rate returns values that ensure this call is a
+ * nop.
+ */
+
+ return 0;
+}
+
+const struct clk_ops owl_fix_fact_ops = {
+ .round_rate = owl_fix_fact_round_rate,
+ .recalc_rate = owl_fix_fact_recalc_rate,
+ .set_rate = owl_fix_fact_set_rate,
+};
diff --git a/drivers/clk/actions/owl-fixed-factor.h b/drivers/clk/actions/owl-fixed-factor.h
new file mode 100644
index 000000000000..665dadef8738
--- /dev/null
+++ b/drivers/clk/actions/owl-fixed-factor.h
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// OWL fixed factor clock driver
+//
+// Copyright (c) 2014 Actions Semi Inc.
+// Author: David Liu <liuwei@actions-semi.com>
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+#ifndef _OWL_FIXED_FACTOR_H_
+#define _OWL_FIXED_FACTOR_H_
+
+#include "owl-common.h"
+
+struct owl_fix_fact_hw {
+ unsigned int mul;
+ unsigned int div;
+};
+
+struct owl_fix_fact {
+ struct owl_fix_fact_hw fix_fact_hw;
+ struct owl_clk_common common;
+};
+
+#define OWL_FIX_FACT_HW(_mul, _div) \
+ { \
+ .mul = _mul, \
+ .div = _div, \
+ }
+
+#define OWL_FIX_FACT(_struct, _name, _parent, _mul, _div, _flags) \
+ struct owl_fix_fact _struct = { \
+ .fix_fact_hw = OWL_FIX_FACT_HW(_mul, _div), \
+ .common = { \
+ .regmap = NULL, \
+ .hw.init = CLK_HW_INIT(_name, \
+ _parent, \
+ &owl_fix_fact_ops,\
+ _flags), \
+ }, \
+ }
+
+static inline struct owl_fix_fact *hw_to_owl_fix_fact(const struct clk_hw *hw)
+{
+ struct owl_clk_common *common = hw_to_owl_clk_common(hw);
+
+ return container_of(common, struct owl_fix_fact, common);
+}
+
+long owl_fix_fact_helper_round_rate(struct owl_clk_common *common,
+ const struct owl_fix_fact_hw *fix_fact_hw,
+ unsigned long rate,
+ unsigned long *parent_rate);
+
+unsigned long owl_fix_fact_helper_recalc_rate(struct owl_clk_common *common,
+ const struct owl_fix_fact_hw *fix_fact_hw,
+ unsigned long parent_rate);
+
+extern const struct clk_ops owl_fix_fact_ops;
+
+#endif /* _OWL_FIXED_FACTOR_H_ */
--
2.14.1
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