[PATCH 25/40] ARM: imx: add common clock support for clk busy
Sascha Hauer
s.hauer at pengutronix.de
Tue Apr 10 09:45:38 EDT 2012
From: Shawn Guo <shawn.guo at linaro.org>
Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
---
arch/arm/mach-imx/Makefile | 2 +-
arch/arm/mach-imx/clk-busy.c | 167 ++++++++++++++++++++++++++++++++++++++++++
arch/arm/mach-imx/clk.h | 8 ++
3 files changed, 176 insertions(+), 1 deletion(-)
create mode 100644 arch/arm/mach-imx/clk-busy.c
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 4d6be8d..ae0a779 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -12,7 +12,7 @@ obj-$(CONFIG_SOC_IMX35) += mm-imx3.o cpu-imx35.o clock-imx35.o ehci-imx35.o pm-i
obj-$(CONFIG_SOC_IMX5) += cpu-imx5.o mm-imx5.o clock-mx51-mx53.o ehci-imx5.o pm-imx5.o cpu_op-mx51.o
obj-$(CONFIG_COMMON_CLK) += clk-pllv1.o clk-pllv2.o clk-pllv3.o clk-gate2.o \
- clk-pfd.o
+ clk-pfd.o clk-busy.o
# Support for CMOS sensor interface
obj-$(CONFIG_MX1_VIDEO) += mx1-camera-fiq.o mx1-camera-fiq-ksym.o
diff --git a/arch/arm/mach-imx/clk-busy.c b/arch/arm/mach-imx/clk-busy.c
new file mode 100644
index 0000000..9450f0b
--- /dev/null
+++ b/arch/arm/mach-imx/clk-busy.c
@@ -0,0 +1,167 @@
+/*
+ * 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 "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_hw hw;
+ void __iomem *reg;
+ u8 shift;
+ struct clk_divider div;
+ const struct clk_ops *div_ops;
+};
+
+#define to_clk_busy_divider(_hw) container_of(_hw, struct clk_busy_divider, hw)
+
+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)
+{
+ struct clk_busy_divider *busy = to_clk_busy_divider(hw);
+ int ret;
+
+ ret = busy->div_ops->set_rate(&busy->div.hw, 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, 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;
+
+ busy = kzalloc(sizeof(*busy), GFP_KERNEL);
+ if (!busy)
+ return NULL;
+
+ 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;
+
+ clk = clk_register(NULL, name, &clk_busy_divider_ops, &busy->hw,
+ &parent_name, 1, CLK_SET_RATE_PARENT);
+ if (!clk)
+ kfree(busy);
+
+ busy->div.hw.clk = clk;
+
+ return clk;
+}
+
+struct clk_busy_mux {
+ struct clk_hw hw;
+ void __iomem *reg;
+ u8 shift;
+ struct clk_mux mux;
+ const struct clk_ops *mux_ops;
+};
+
+#define to_clk_busy_mux(_hw) container_of(_hw, struct clk_busy_mux, hw)
+
+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,
+ char **parent_names, int num_parents)
+{
+ struct clk_busy_mux *busy;
+ struct clk *clk;
+
+ busy = kzalloc(sizeof(*busy), GFP_KERNEL);
+ if (!busy)
+ return NULL;
+
+ 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;
+
+ clk = clk_register(NULL, name, &clk_busy_mux_ops, &busy->hw,
+ parent_names, num_parents, 0);
+ if (!clk)
+ kfree(busy);
+
+ busy->mux.hw.clk = clk;
+
+ return clk;
+}
diff --git a/arch/arm/mach-imx/clk.h b/arch/arm/mach-imx/clk.h
index 50f5638..53ab2f5 100644
--- a/arch/arm/mach-imx/clk.h
+++ b/arch/arm/mach-imx/clk.h
@@ -44,6 +44,10 @@ static inline struct clk *imx_clk_divider(const char *name, const char *parent,
reg, shift, width, 0, &imx_ccm_lock);
}
+struct clk *imx_clk_busy_divider(const char *name, char *parent_name,
+ void __iomem *reg, u8 shift, u8 width,
+ void __iomem *busy_reg, u8 busy_shift);
+
static inline struct clk *imx_clk_gate(const char *name, const char *parent,
void __iomem *reg, u8 shift)
{
@@ -65,6 +69,10 @@ static inline struct clk *imx_clk_mux(const char *name, void __iomem *reg,
width, 0, &imx_ccm_lock);
}
+struct clk *imx_clk_busy_mux(const char *name, void __iomem *reg, u8 shift,
+ u8 width, void __iomem *busy_reg, u8 busy_shift,
+ char **parent_names, int num_parents);
+
static inline struct clk *imx_clk_fixed_factor(const char *name,
const char *parent, unsigned int mult, unsigned int div)
{
--
1.7.9.5
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