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-rw-r--r--arch/arm/mach-imx/clk-busy.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/clk-busy.c b/arch/arm/mach-imx/clk-busy.c
new file mode 100644
index 0000000..1a7a8dd
--- /dev/null
+++ b/arch/arm/mach-imx/clk-busy.c
@@ -0,0 +1,189 @@
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright 2012 Linaro Ltd.
+ *
+ * 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.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/err.h>
+#include "clk.h"
+
+static int clk_busy_wait(void __iomem *reg, u8 shift)
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(10);
+
+ while (readl_relaxed(reg) & (1 << shift))
+ if (time_after(jiffies, timeout))
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+struct clk_busy_divider {
+ struct clk_divider div;
+ const struct clk_ops *div_ops;
+ void __iomem *reg;
+ u8 shift;
+};
+
+static inline struct clk_busy_divider *to_clk_busy_divider(struct clk_hw *hw)
+{
+ struct clk_divider *div = container_of(hw, struct clk_divider, hw);
+
+ return container_of(div, struct clk_busy_divider, div);
+}
+
+static unsigned long clk_busy_divider_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_busy_divider *busy = to_clk_busy_divider(hw);
+
+ return busy->div_ops->recalc_rate(&busy->div.hw, parent_rate);
+}
+
+static long clk_busy_divider_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_busy_divider *busy = to_clk_busy_divider(hw);
+
+ return busy->div_ops->round_rate(&busy->div.hw, rate, prate);
+}
+
+static int clk_busy_divider_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_busy_divider *busy = to_clk_busy_divider(hw);
+ int ret;
+
+ ret = busy->div_ops->set_rate(&busy->div.hw, rate, parent_rate);
+ if (!ret)
+ ret = clk_busy_wait(busy->reg, busy->shift);
+
+ return ret;
+}
+
+static struct clk_ops clk_busy_divider_ops = {
+ .recalc_rate = clk_busy_divider_recalc_rate,
+ .round_rate = clk_busy_divider_round_rate,
+ .set_rate = clk_busy_divider_set_rate,
+};
+
+struct clk *imx_clk_busy_divider(const char *name, const char *parent_name,
+ void __iomem *reg, u8 shift, u8 width,
+ void __iomem *busy_reg, u8 busy_shift)
+{
+ struct clk_busy_divider *busy;
+ struct clk *clk;
+ struct clk_init_data init;
+
+ busy = kzalloc(sizeof(*busy), GFP_KERNEL);
+ if (!busy)
+ return ERR_PTR(-ENOMEM);
+
+ busy->reg = busy_reg;
+ busy->shift = busy_shift;
+
+ busy->div.reg = reg;
+ busy->div.shift = shift;
+ busy->div.width = width;
+ busy->div.lock = &imx_ccm_lock;
+ busy->div_ops = &clk_divider_ops;
+
+ init.name = name;
+ init.ops = &clk_busy_divider_ops;
+ init.flags = CLK_SET_RATE_PARENT;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ busy->div.hw.init = &init;
+
+ clk = clk_register(NULL, &busy->div.hw);
+ if (!clk)
+ kfree(busy);
+
+ return clk;
+}
+
+struct clk_busy_mux {
+ struct clk_mux mux;
+ const struct clk_ops *mux_ops;
+ void __iomem *reg;
+ u8 shift;
+};
+
+static inline struct clk_busy_mux *to_clk_busy_mux(struct clk_hw *hw)
+{
+ struct clk_mux *mux = container_of(hw, struct clk_mux, hw);
+
+ return container_of(mux, struct clk_busy_mux, mux);
+}
+
+static u8 clk_busy_mux_get_parent(struct clk_hw *hw)
+{
+ struct clk_busy_mux *busy = to_clk_busy_mux(hw);
+
+ return busy->mux_ops->get_parent(&busy->mux.hw);
+}
+
+static int clk_busy_mux_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_busy_mux *busy = to_clk_busy_mux(hw);
+ int ret;
+
+ ret = busy->mux_ops->set_parent(&busy->mux.hw, index);
+ if (!ret)
+ ret = clk_busy_wait(busy->reg, busy->shift);
+
+ return ret;
+}
+
+struct clk_ops clk_busy_mux_ops = {
+ .get_parent = clk_busy_mux_get_parent,
+ .set_parent = clk_busy_mux_set_parent,
+};
+
+struct clk *imx_clk_busy_mux(const char *name, void __iomem *reg, u8 shift,
+ u8 width, void __iomem *busy_reg, u8 busy_shift,
+ const char **parent_names, int num_parents)
+{
+ struct clk_busy_mux *busy;
+ struct clk *clk;
+ struct clk_init_data init;
+
+ busy = kzalloc(sizeof(*busy), GFP_KERNEL);
+ if (!busy)
+ return ERR_PTR(-ENOMEM);
+
+ busy->reg = busy_reg;
+ busy->shift = busy_shift;
+
+ busy->mux.reg = reg;
+ busy->mux.shift = shift;
+ busy->mux.width = width;
+ busy->mux.lock = &imx_ccm_lock;
+ busy->mux_ops = &clk_mux_ops;
+
+ init.name = name;
+ init.ops = &clk_busy_mux_ops;
+ init.flags = 0;
+ init.parent_names = parent_names;
+ init.num_parents = num_parents;
+
+ busy->mux.hw.init = &init;
+
+ clk = clk_register(NULL, &busy->mux.hw);
+ if (IS_ERR(clk))
+ kfree(busy);
+
+ return clk;
+}