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path: root/drivers/clk/clk-multiplier.c
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-rw-r--r--drivers/clk/clk-multiplier.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/drivers/clk/clk-multiplier.c b/drivers/clk/clk-multiplier.c
new file mode 100644
index 000000000..fe7806506
--- /dev/null
+++ b/drivers/clk/clk-multiplier.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2015 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 version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+
+#define to_clk_multiplier(_hw) container_of(_hw, struct clk_multiplier, hw)
+
+static unsigned long __get_mult(struct clk_multiplier *mult,
+ unsigned long rate,
+ unsigned long parent_rate)
+{
+ if (mult->flags & CLK_MULTIPLIER_ROUND_CLOSEST)
+ return DIV_ROUND_CLOSEST(rate, parent_rate);
+
+ return rate / parent_rate;
+}
+
+static unsigned long clk_multiplier_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_multiplier *mult = to_clk_multiplier(hw);
+ unsigned long val;
+
+ val = clk_readl(mult->reg) >> mult->shift;
+ val &= GENMASK(mult->width - 1, 0);
+
+ if (!val && mult->flags & CLK_MULTIPLIER_ZERO_BYPASS)
+ val = 1;
+
+ return parent_rate * val;
+}
+
+static bool __is_best_rate(unsigned long rate, unsigned long new,
+ unsigned long best, unsigned long flags)
+{
+ if (flags & CLK_MULTIPLIER_ROUND_CLOSEST)
+ return abs(rate - new) < abs(rate - best);
+
+ return new >= rate && new < best;
+}
+
+static unsigned long __bestmult(struct clk_hw *hw, unsigned long rate,
+ unsigned long *best_parent_rate,
+ u8 width, unsigned long flags)
+{
+ unsigned long orig_parent_rate = *best_parent_rate;
+ unsigned long parent_rate, current_rate, best_rate = ~0;
+ unsigned int i, bestmult = 0;
+
+ if (!(clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT))
+ return rate / *best_parent_rate;
+
+ for (i = 1; i < ((1 << width) - 1); i++) {
+ if (rate == orig_parent_rate * i) {
+ /*
+ * This is the best case for us if we have a
+ * perfect match without changing the parent
+ * rate.
+ */
+ *best_parent_rate = orig_parent_rate;
+ return i;
+ }
+
+ parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw),
+ rate / i);
+ current_rate = parent_rate * i;
+
+ if (__is_best_rate(rate, current_rate, best_rate, flags)) {
+ bestmult = i;
+ best_rate = current_rate;
+ *best_parent_rate = parent_rate;
+ }
+ }
+
+ return bestmult;
+}
+
+static long clk_multiplier_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct clk_multiplier *mult = to_clk_multiplier(hw);
+ unsigned long factor = __bestmult(hw, rate, parent_rate,
+ mult->width, mult->flags);
+
+ return *parent_rate * factor;
+}
+
+static int clk_multiplier_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_multiplier *mult = to_clk_multiplier(hw);
+ unsigned long factor = __get_mult(mult, rate, parent_rate);
+ unsigned long flags = 0;
+ unsigned long val;
+
+ if (mult->lock)
+ spin_lock_irqsave(mult->lock, flags);
+ else
+ __acquire(mult->lock);
+
+ val = clk_readl(mult->reg);
+ val &= ~GENMASK(mult->width + mult->shift - 1, mult->shift);
+ val |= factor << mult->shift;
+ clk_writel(val, mult->reg);
+
+ if (mult->lock)
+ spin_unlock_irqrestore(mult->lock, flags);
+ else
+ __release(mult->lock);
+
+ return 0;
+}
+
+const struct clk_ops clk_multiplier_ops = {
+ .recalc_rate = clk_multiplier_recalc_rate,
+ .round_rate = clk_multiplier_round_rate,
+ .set_rate = clk_multiplier_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_multiplier_ops);