1 files changed, 129 insertions, 0 deletions

diff --git a/arch/arm/mach-imx/clk-fixup-div.c b/arch/arm/mach-imx/clk-fixup-div.c
new file mode 100644
index 000000000000..21db020b1f2d
--- /dev/null
+++ b/arch/arm/mach-imx/clk-fixup-div.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include "clk.h"
+
+#define to_clk_div(_hw) container_of(_hw, struct clk_divider, hw)
+#define div_mask(d)     ((1 << (d->width)) - 1)
+
+/**
+ * struct clk_fixup_div - imx integer fixup divider clock
+ * @divider: the parent class
+ * @ops: pointer to clk_ops of parent class
+ * @fixup: a hook to fixup the write value
+ *
+ * The imx fixup divider clock is a subclass of basic clk_divider
+ * with an addtional fixup hook.
+ */
+struct clk_fixup_div {
+        struct clk_divider divider;
+        const struct clk_ops *ops;
+        void (*fixup)(u32 *val);
+};
+
+static inline struct clk_fixup_div *to_clk_fixup_div(struct clk_hw *hw)
+{
+        struct clk_divider *divider = to_clk_div(hw);
+
+        return container_of(divider, struct clk_fixup_div, divider);
+}
+
+static unsigned long clk_fixup_div_recalc_rate(struct clk_hw *hw,
+                                         unsigned long parent_rate)
+{
+        struct clk_fixup_div *fixup_div = to_clk_fixup_div(hw);
+
+        return fixup_div->ops->recalc_rate(&fixup_div->divider.hw, parent_rate);
+}
+
+static long clk_fixup_div_round_rate(struct clk_hw *hw, unsigned long rate,
+                               unsigned long *prate)
+{
+        struct clk_fixup_div *fixup_div = to_clk_fixup_div(hw);
+
+        return fixup_div->ops->round_rate(&fixup_div->divider.hw, rate, prate);
+}
+
+static int clk_fixup_div_set_rate(struct clk_hw *hw, unsigned long rate,
+                            unsigned long parent_rate)
+{
+        struct clk_fixup_div *fixup_div = to_clk_fixup_div(hw);
+        struct clk_divider *div = to_clk_div(hw);
+        unsigned int divider, value;
+        unsigned long flags = 0;
+        u32 val;
+
+        divider = parent_rate / rate;
+
+        /* Zero based divider */
+        value = divider - 1;
+
+        if (value > div_mask(div))
+                value = div_mask(div);
+
+        spin_lock_irqsave(div->lock, flags);
+
+        val = readl(div->reg);
+        val &= ~(div_mask(div) << div->shift);
+        val |= value << div->shift;
+        fixup_div->fixup(&val);
+        writel(val, div->reg);
+
+        spin_unlock_irqrestore(div->lock, flags);
+
+        return 0;
+}
+
+static const struct clk_ops clk_fixup_div_ops = {
+        .recalc_rate = clk_fixup_div_recalc_rate,
+        .round_rate = clk_fixup_div_round_rate,
+        .set_rate = clk_fixup_div_set_rate,
+};
+
+struct clk *imx_clk_fixup_divider(const char *name, const char *parent,
+                                  void __iomem *reg, u8 shift, u8 width,
+                                  void (*fixup)(u32 *val))
+{
+        struct clk_fixup_div *fixup_div;
+        struct clk *clk;
+        struct clk_init_data init;
+
+        if (!fixup)
+                return ERR_PTR(-EINVAL);
+
+        fixup_div = kzalloc(sizeof(*fixup_div), GFP_KERNEL);
+        if (!fixup_div)
+                return ERR_PTR(-ENOMEM);
+
+        init.name = name;
+        init.ops = &clk_fixup_div_ops;
+        init.flags = CLK_SET_RATE_PARENT;
+        init.parent_names = parent ? &parent : NULL;
+        init.num_parents = parent ? 1 : 0;
+
+        fixup_div->divider.reg = reg;
+        fixup_div->divider.shift = shift;
+        fixup_div->divider.width = width;
+        fixup_div->divider.lock = &imx_ccm_lock;
+        fixup_div->divider.hw.init = &init;
+        fixup_div->ops = &clk_divider_ops;
+        fixup_div->fixup = fixup;
+
+        clk = clk_register(NULL, &fixup_div->divider.hw);
+        if (IS_ERR(clk))
+                kfree(fixup_div);
+
+        return clk;
+}