clk: add a fixed factor clock

Having fixed factors/dividers in hardware is a common pattern, so
add a basic clock type doing this. It basically describes a fixed
factor clock using a nominator and a denominator.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Viresh Kumar <viresh.kumar@st.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
[mturquette@linaro.org: constify parent_names in static init macro]
[mturquette@linaro.org: copy/paste bug from mux in static init macro]
[mturquette@linaro.org: fix error handling in clk_register_fixed_factor]
[mturquette@linaro.org: improve division accuracy; thanks to Saravana]
Signed-off-by: Mike Turquette <mturquette@linaro.org>

2 files changed, 96 insertions, 1 deletions

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 1f736bc11c4b..24aa7144811b 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -1,4 +1,4 @@
 
 obj-$(CONFIG_CLKDEV_LOOKUP)     += clkdev.o
 obj-$(CONFIG_COMMON_CLK)        += clk.o clk-fixed-rate.o clk-gate.o \
-                                   clk-mux.o clk-divider.o
+                                   clk-mux.o clk-divider.o clk-fixed-factor.o
diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
new file mode 100644
index 000000000000..c8c003e217ad
--- /dev/null
+++ b/drivers/clk/clk-fixed-factor.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2011 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
+ *
+ * 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.
+ *
+ * Standard functionality for the common clock API.
+ */
+#include <linux/module.h>
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+
+/*
+ * DOC: basic fixed multiplier and divider clock that cannot gate
+ *
+ * Traits of this clock:
+ * prepare - clk_prepare only ensures that parents are prepared
+ * enable - clk_enable only ensures that parents are enabled
+ * rate - rate is fixed.  clk->rate = parent->rate / div * mult
+ * parent - fixed parent.  No clk_set_parent support
+ */
+
+#define to_clk_fixed_factor(_hw) container_of(_hw, struct clk_fixed_factor, hw)
+
+static unsigned long clk_factor_recalc_rate(struct clk_hw *hw,
+                unsigned long parent_rate)
+{
+        struct clk_fixed_factor *fix = to_clk_fixed_factor(hw);
+
+        return parent_rate * fix->mult / fix->div;
+}
+
+static long clk_factor_round_rate(struct clk_hw *hw, unsigned long rate,
+                                unsigned long *prate)
+{
+        struct clk_fixed_factor *fix = to_clk_fixed_factor(hw);
+
+        if (__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT) {
+                unsigned long best_parent;
+
+                best_parent = (rate / fix->mult) * fix->div;
+                *prate = __clk_round_rate(__clk_get_parent(hw->clk),
+                                best_parent);
+        }
+
+        return (*prate / fix->div) * fix->mult;
+}
+
+static int clk_factor_set_rate(struct clk_hw *hw, unsigned long rate,
+                                unsigned long parent_rate)
+{
+        return 0;
+}
+
+struct clk_ops clk_fixed_factor_ops = {
+        .round_rate = clk_factor_round_rate,
+        .set_rate = clk_factor_set_rate,
+        .recalc_rate = clk_factor_recalc_rate,
+};
+EXPORT_SYMBOL_GPL(clk_fixed_factor_ops);
+
+struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
+                const char *parent_name, unsigned long flags,
+                unsigned int mult, unsigned int div)
+{
+        struct clk_fixed_factor *fix;
+        struct clk_init_data init;
+        struct clk *clk;
+
+        fix = kmalloc(sizeof(*fix), GFP_KERNEL);
+        if (!fix) {
+                pr_err("%s: could not allocate fixed factor clk\n", __func__);
+                return ERR_PTR(-ENOMEM);
+        }
+
+        /* struct clk_fixed_factor assignments */
+        fix->mult = mult;
+        fix->div = div;
+        fix->hw.init = &init;
+
+        init.name = name;
+        init.ops = &clk_fixed_factor_ops;
+        init.flags = flags;
+        init.parent_names = &parent_name;
+        init.num_parents = 1;
+
+        clk = clk_register(dev, &fix->hw);
+
+        if (IS_ERR(clk))
+                kfree(fix);
+
+        return clk;
+}