clk: sunxi-ng: Add N-class clocks support

Add support for the class with a single factor, N, being a multiplier.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>

diff --git a/drivers/clk/sunxi-ng/Kconfig b/drivers/clk/sunxi-ng/Kconfig
index a1dee86..c725877 100644 (file)
--- a/drivers/clk/sunxi-ng/Kconfig
+++ b/drivers/clk/sunxi-ng/Kconfig
@@ -19,6 +19,10 @@ config SUNXI_CCU_GATE
 config SUNXI_CCU_MUX
        bool
 
+config SUNXI_CCU_MULT
+       bool
+       select SUNXI_CCU_MUX
+
 config SUNXI_CCU_PHASE
        bool
 

diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile
index 261438b..462a5f8 100644 (file)
--- a/drivers/clk/sunxi-ng/Makefile
+++ b/drivers/clk/sunxi-ng/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_SUNXI_CCU_DIV)     += ccu_div.o
 obj-$(CONFIG_SUNXI_CCU_FRAC)   += ccu_frac.o
 obj-$(CONFIG_SUNXI_CCU_GATE)   += ccu_gate.o
 obj-$(CONFIG_SUNXI_CCU_MUX)    += ccu_mux.o
+obj-$(CONFIG_SUNXI_CCU_MULT)   += ccu_mult.o
 obj-$(CONFIG_SUNXI_CCU_PHASE)  += ccu_phase.o
 
 # Multi-factor clocks

diff --git a/drivers/clk/sunxi-ng/ccu_mult.c b/drivers/clk/sunxi-ng/ccu_mult.c
new file mode 100644 (file)
index 0000000..010e942
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_mult.c
@@ -0,0 +1,133 @@
+/*
+ * 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 "ccu_gate.h"
+#include "ccu_mult.h"
+
+static void ccu_mult_find_best(unsigned long parent, unsigned long rate,
+                              unsigned int max_n, unsigned int *n)
+{
+       *n = rate / parent;
+}
+
+static unsigned long ccu_mult_round_rate(struct ccu_mux_internal *mux,
+                                       unsigned long parent_rate,
+                                       unsigned long rate,
+                                       void *data)
+{
+       struct ccu_mult *cm = data;
+       unsigned int n;
+
+       ccu_mult_find_best(parent_rate, rate, 1 << cm->mult.width, &n);
+
+       return parent_rate * n;
+}
+
+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;
+
+       reg = readl(cm->common.base + cm->common.reg);
+       val = reg >> cm->mult.shift;
+       val &= (1 << cm->mult.width) - 1;
+
+       ccu_mux_helper_adjust_parent_for_prediv(&cm->common, &cm->mux, -1,
+                                               &parent_rate);
+
+       return parent_rate * (val + 1);
+}
+
+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);
+       unsigned long flags;
+       unsigned int n;
+       u32 reg;
+
+       ccu_mux_helper_adjust_parent_for_prediv(&cm->common, &cm->mux, -1,
+                                               &parent_rate);
+
+       ccu_mult_find_best(parent_rate, rate, 1 << cm->mult.width, &n);
+
+       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);
+
+       writel(reg | ((n - 1) << cm->mult.shift),
+              cm->common.base + cm->common.reg);
+
+       spin_unlock_irqrestore(cm->common.lock, flags);
+
+       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,
+};

diff --git a/drivers/clk/sunxi-ng/ccu_mult.h b/drivers/clk/sunxi-ng/ccu_mult.h
index 609db66..5d2c8dc 100644 (file)
--- a/drivers/clk/sunxi-ng/ccu_mult.h
+++ b/drivers/clk/sunxi-ng/ccu_mult.h
@@ -1,6 +1,9 @@
 #ifndef _CCU_MULT_H_
 #define _CCU_MULT_H_
 
+#include "ccu_common.h"
+#include "ccu_mux.h"
+
 struct _ccu_mult {
        u8      shift;
        u8      width;
@@ -12,4 +15,36 @@ struct _ccu_mult {
                .width  = _width,               \
        }
 
+struct ccu_mult {
+       u32                     enable;
+
+       struct _ccu_mult        mult;
+       struct ccu_mux_internal mux;
+       struct ccu_common       common;
+};
+
+#define SUNXI_CCU_N_WITH_GATE_LOCK(_struct, _name, _parent, _reg,      \
+                                  _mshift, _mwidth, _gate, _lock,      \
+                                  _flags)                              \
+       struct ccu_mult _struct = {                                     \
+               .enable = _gate,                                        \
+               .mult   = _SUNXI_CCU_MULT(_mshift, _mwidth),            \
+               .common = {                                             \
+                       .reg            = _reg,                         \
+                       .hw.init        = CLK_HW_INIT(_name,            \
+                                                     _parent,          \
+                                                     &ccu_mult_ops,    \
+                                                     _flags),          \
+               },                                                      \
+       }
+
+static inline struct ccu_mult *hw_to_ccu_mult(struct clk_hw *hw)
+{
+       struct ccu_common *common = hw_to_ccu_common(hw);
+
+       return container_of(common, struct ccu_mult, common);
+}
+
+extern const struct clk_ops ccu_mult_ops;
+
 #endif /* _CCU_MULT_H_ */