[PATCH 13/16] clk: sunxi-ng: Add N-K-M Factor clock

Maxime Ripard
2016-05-08T20:01:48Z

Introduce support for clocks that multiply and divide using two linear
multipliers and one linear divider.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
drivers/clk/sunxi-ng/Makefile | 1 +
drivers/clk/sunxi-ng/ccu_nkm.c | 144 +++++++++++++++++++++++++++++++++++++++++
drivers/clk/sunxi-ng/ccu_nkm.h | 42 ++++++++++++
3 files changed, 187 insertions(+)
create mode 100644 drivers/clk/sunxi-ng/ccu_nkm.c
create mode 100644 drivers/clk/sunxi-ng/ccu_nkm.h

diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile
index fba64c7f4fcd..2bb8bc22e907 100644
--- a/drivers/clk/sunxi-ng/Makefile
+++ b/drivers/clk/sunxi-ng/Makefile
@@ -8,6 +8,7 @@ obj-y += ccu_m.o
obj-y += ccu_mp.o
obj-y += ccu_mux.o
obj-y += ccu_nk.o
+obj-y += ccu_nkm.o
obj-y += ccu_nm.o
obj-y += ccu_p.o
obj-y += ccu_phase.o
diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
new file mode 100644
index 000000000000..9019c7f6988c
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_nkm.c
@@ -0,0 +1,144 @@
+/*
+ * 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 <linux/rational.h>
+
+#include "ccu_gate.h"
+#include "ccu_nkm.h"
+
+void ccu_nkm_find_best(unsigned long parent, unsigned long rate,
+ unsigned long max_n, unsigned long max_k, unsigned long max_m,
+ unsigned long *n, unsigned long *k, unsigned long *m)
+{
+ unsigned long best_rate = 0;
+ unsigned long best_n = 0, best_k = 0, best_m = 0;
+ unsigned long _n, _k, _m;
+
+ for (_k = 1; _k <= max_k; _k++) {
+ unsigned long tmp_rate;
+
+ rational_best_approximation(rate / _k, parent,
+ max_n, max_m, &_n, &_m);
+
+ tmp_rate = parent * _n * _k / _m;
+
+ if (tmp_rate > rate)
+ continue;
+
+ if ((rate - tmp_rate) < (rate - best_rate)) {
+ best_rate = tmp_rate;
+ best_n = _n;
+ best_k = _k;
+ best_m = _m;
+ }
+ }
+
+ *n = best_n;
+ *k = best_k;
+ *m = best_m;
+}
+
+static void ccu_nkm_disable(struct clk_hw *hw)
+{
+ struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+
+ return ccu_gate_helper_disable(&nkm->common, nkm->enable);
+}
+
+static int ccu_nkm_enable(struct clk_hw *hw)
+{
+ struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+
+ return ccu_gate_helper_enable(&nkm->common, nkm->enable);
+}
+
+static int ccu_nkm_is_enabled(struct clk_hw *hw)
+{
+ struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+
+ return ccu_gate_helper_is_enabled(&nkm->common, nkm->enable);
+}
+
+static unsigned long ccu_nkm_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+ unsigned long n, m, k;
+ u32 reg;
+
+ reg = readl(nkm->common.base + nkm->common.reg);
+
+ n = reg >> nkm->n.shift;
+ n &= (1 << nkm->n.width) - 1;
+
+ k = reg >> nkm->k.shift;
+ k &= (1 << nkm->k.width) - 1;
+
+ m = reg >> nkm->m.shift;
+ m &= (1 << nkm->m.width) - 1;
+
+ return parent_rate * (n + 1) * (k + 1) / (m + 1);
+}
+
+static long ccu_nkm_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+ unsigned long n, k, m;
+
+ ccu_nkm_find_best(*parent_rate, rate, 1 << nkm->n.width,
+ 1 << nkm->k.width, 1 << nkm->m.width,
+ &n, &k, &m);
+
+ return *parent_rate * n * k / m;
+}
+
+static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
+ unsigned long n, k, m;
+ unsigned long flags;
+ u32 reg;
+
+ ccu_nkm_find_best(parent_rate, rate, 1 << nkm->n.width,
+ 1 << nkm->k.width, 1 << nkm->m.width,
+ &n, &k, &m);
+
+ spin_lock_irqsave(nkm->common.lock, flags);
+
+ reg = readl(nkm->common.base + nkm->common.reg);
+ reg &= ~GENMASK(nkm->n.width + nkm->n.shift, nkm->n.shift);
+ reg &= ~GENMASK(nkm->k.width + nkm->k.shift, nkm->k.shift);
+ reg &= ~GENMASK(nkm->m.width + nkm->m.shift, nkm->m.shift);
+
+ reg |= (n - 1) << nkm->m.shift;
+ reg |= (k - 1) << nkm->m.shift;
+ reg |= (m - 1) << nkm->m.shift;
+
+ writel(reg, nkm->common.base + nkm->common.reg);
+
+ spin_unlock_irqrestore(nkm->common.lock, flags);
+
+ ccu_helper_wait_for_lock(&nkm->common, nkm->lock);
+
+ return 0;
+}
+
+const struct clk_ops ccu_nkm_ops = {
+ .disable = ccu_nkm_disable,
+ .enable = ccu_nkm_enable,
+ .is_enabled = ccu_nkm_is_enabled,
+
+ .recalc_rate = ccu_nkm_recalc_rate,
+ .round_rate = ccu_nkm_round_rate,
+ .set_rate = ccu_nkm_set_rate,
+};
diff --git a/drivers/clk/sunxi-ng/ccu_nkm.h b/drivers/clk/sunxi-ng/ccu_nkm.h
new file mode 100644
index 000000000000..1301e9f08305
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_nkm.h
@@ -0,0 +1,42 @@
+/*
+ * 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_NKM_H_
+#define _CCU_NKM_H_
+
+#include <linux/clk-provider.h>
+
+#include "ccu_factor.h"
+#include "ccu_common.h"
+
+struct ccu_nkm {
+ u32 enable;
+ u32 lock;
+
+ struct ccu_factor n;
+ struct ccu_factor k;
+ struct ccu_factor m;
+
+ struct ccu_common common;
+};
+
+static inline struct ccu_nkm *hw_to_ccu_nkm(struct clk_hw *hw)
+{
+ struct ccu_common *common = hw_to_ccu_common(hw);
+
+ return container_of(common, struct ccu_nkm, common);
+}
+
+extern const struct clk_ops ccu_nkm_ops;
+
+#endif /* _CCU_NKM_H_ */
--
2.8.2

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