These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / clk / imx / clk-fixup-div.c

diff --git a/kernel/drivers/clk/imx/clk-fixup-div.c b/kernel/drivers/clk/imx/clk-fixup-div.c
new file mode 100644 (file)
index 0000000..21db020
--- /dev/null
+++ b/kernel/drivers/clk/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;
+}