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path: root/drivers/clk/sunxi-ng/ccu_mult.c
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-rw-r--r--drivers/clk/sunxi-ng/ccu_mult.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/clk/sunxi-ng/ccu_mult.c b/drivers/clk/sunxi-ng/ccu_mult.c
new file mode 100644
index 000000000..7bee217ef
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_mult.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Maxime Ripard
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+
+#include "ccu_gate.h"
+#include "ccu_mult.h"
+
+struct _ccu_mult {
+ unsigned long mult, min, max;
+};
+
+static void ccu_mult_find_best(unsigned long parent, unsigned long rate,
+ struct _ccu_mult *mult)
+{
+ int _mult;
+
+ _mult = rate / parent;
+ if (_mult < mult->min)
+ _mult = mult->min;
+
+ if (_mult > mult->max)
+ _mult = mult->max;
+
+ mult->mult = _mult;
+}
+
+static unsigned long ccu_mult_round_rate(struct ccu_mux_internal *mux,
+ struct clk_hw *parent,
+ unsigned long *parent_rate,
+ unsigned long rate,
+ void *data)
+{
+ struct ccu_mult *cm = data;
+ struct _ccu_mult _cm;
+
+ _cm.min = cm->mult.min;
+
+ if (cm->mult.max)
+ _cm.max = cm->mult.max;
+ else
+ _cm.max = (1 << cm->mult.width) + cm->mult.offset - 1;
+
+ ccu_mult_find_best(*parent_rate, rate, &_cm);
+
+ return *parent_rate * _cm.mult;
+}
+
+static void ccu_mult_disable(struct clk_hw *hw)
+{
+ struct ccu_mult *cm = hw_to_ccu_mult(hw);
+
+ return ccu_gate_helper_disable(&cm->common, cm->enable);
+}
+
+static int ccu_mult_enable(struct clk_hw *hw)
+{
+ struct ccu_mult *cm = hw_to_ccu_mult(hw);
+
+ return ccu_gate_helper_enable(&cm->common, cm->enable);
+}
+
+static int ccu_mult_is_enabled(struct clk_hw *hw)
+{
+ struct ccu_mult *cm = hw_to_ccu_mult(hw);
+
+ return ccu_gate_helper_is_enabled(&cm->common, cm->enable);
+}
+
+static unsigned long ccu_mult_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct ccu_mult *cm = hw_to_ccu_mult(hw);
+ unsigned long val;
+ u32 reg;
+
+ if (ccu_frac_helper_is_enabled(&cm->common, &cm->frac))
+ return ccu_frac_helper_read_rate(&cm->common, &cm->frac);
+
+ reg = readl(cm->common.base + cm->common.reg);
+ val = reg >> cm->mult.shift;
+ val &= (1 << cm->mult.width) - 1;
+
+ parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1,
+ parent_rate);
+
+ return parent_rate * (val + cm->mult.offset);
+}
+
+static int ccu_mult_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ struct ccu_mult *cm = hw_to_ccu_mult(hw);
+
+ return ccu_mux_helper_determine_rate(&cm->common, &cm->mux,
+ req, ccu_mult_round_rate, cm);
+}
+
+static int ccu_mult_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct ccu_mult *cm = hw_to_ccu_mult(hw);
+ struct _ccu_mult _cm;
+ unsigned long flags;
+ u32 reg;
+
+ if (ccu_frac_helper_has_rate(&cm->common, &cm->frac, rate)) {
+ ccu_frac_helper_enable(&cm->common, &cm->frac);
+
+ return ccu_frac_helper_set_rate(&cm->common, &cm->frac,
+ rate, cm->lock);
+ } else {
+ ccu_frac_helper_disable(&cm->common, &cm->frac);
+ }
+
+ parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1,
+ parent_rate);
+
+ _cm.min = cm->mult.min;
+
+ if (cm->mult.max)
+ _cm.max = cm->mult.max;
+ else
+ _cm.max = (1 << cm->mult.width) + cm->mult.offset - 1;
+
+ ccu_mult_find_best(parent_rate, rate, &_cm);
+
+ spin_lock_irqsave(cm->common.lock, flags);
+
+ reg = readl(cm->common.base + cm->common.reg);
+ reg &= ~GENMASK(cm->mult.width + cm->mult.shift - 1, cm->mult.shift);
+ reg |= ((_cm.mult - cm->mult.offset) << cm->mult.shift);
+
+ writel(reg, cm->common.base + cm->common.reg);
+
+ spin_unlock_irqrestore(cm->common.lock, flags);
+
+ ccu_helper_wait_for_lock(&cm->common, cm->lock);
+
+ return 0;
+}
+
+static u8 ccu_mult_get_parent(struct clk_hw *hw)
+{
+ struct ccu_mult *cm = hw_to_ccu_mult(hw);
+
+ return ccu_mux_helper_get_parent(&cm->common, &cm->mux);
+}
+
+static int ccu_mult_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct ccu_mult *cm = hw_to_ccu_mult(hw);
+
+ return ccu_mux_helper_set_parent(&cm->common, &cm->mux, index);
+}
+
+const struct clk_ops ccu_mult_ops = {
+ .disable = ccu_mult_disable,
+ .enable = ccu_mult_enable,
+ .is_enabled = ccu_mult_is_enabled,
+
+ .get_parent = ccu_mult_get_parent,
+ .set_parent = ccu_mult_set_parent,
+
+ .determine_rate = ccu_mult_determine_rate,
+ .recalc_rate = ccu_mult_recalc_rate,
+ .set_rate = ccu_mult_set_rate,
+};
+EXPORT_SYMBOL_NS_GPL(ccu_mult_ops, SUNXI_CCU);