[PATCH 3/7] clk: qcom: Add support for cdiv clocks

Stephen Boyd
2014-11-20T00:12:34Z

From: Josh Cartwright <joshc@codeaurora.org>

cdiv clocks are dividers with a on/off gate control.

Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.com>
[sboyd@codeaurora.org: Switch to using generic divider code]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
drivers/clk/qcom/Makefile | 1 +
drivers/clk/qcom/clk-cdiv.c | 72 +++++++++++++++++++++++++++++++++++++++++++++
drivers/clk/qcom/clk-cdiv.h | 29 ++++++++++++++++++
3 files changed, 102 insertions(+)
create mode 100644 drivers/clk/qcom/clk-cdiv.c
create mode 100644 drivers/clk/qcom/clk-cdiv.h

diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
index 783cfb24faa4..f26917c6bfd7 100644
--- a/drivers/clk/qcom/Makefile
+++ b/drivers/clk/qcom/Makefile
@@ -6,6 +6,7 @@ clk-qcom-y += clk-pll.o
clk-qcom-y += clk-rcg.o
clk-qcom-y += clk-rcg2.o
clk-qcom-y += clk-branch.o
+clk-qcom-y += clk-cdiv.o
clk-qcom-y += reset.o

obj-$(CONFIG_APQ_GCC_8084) += gcc-apq8084.o
diff --git a/drivers/clk/qcom/clk-cdiv.c b/drivers/clk/qcom/clk-cdiv.c
new file mode 100644
index 000000000000..dc93e8feae43
--- /dev/null
+++ b/drivers/clk/qcom/clk-cdiv.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+#include <linux/regmap.h>
+#include <linux/export.h>
+
+#include "clk-cdiv.h"
+
+static inline struct clk_regmap_div *to_clk_regmap_div(struct clk_hw *hw)
+{
+ return container_of(to_clk_regmap(hw), struct clk_regmap_div, clkr);
+}
+
+static long div_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_regmap_div *divider = to_clk_regmap_div(hw);
+
+ return divider_round_rate(hw, rate, prate, NULL, divider->width,
+ CLK_DIVIDER_ROUND_CLOSEST);
+}
+
+static int div_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_regmap_div *divider = to_clk_regmap_div(hw);
+ struct clk_regmap *clkr = &divider->clkr;
+ u32 div;
+
+ div = divider_get_val(rate, parent_rate, NULL, divider->width,
+ CLK_DIVIDER_ROUND_CLOSEST);
+
+ return regmap_update_bits(clkr->regmap, divider->reg,
+ (BIT(divider->width) - 1) << divider->shift,
+ div << divider->shift);
+}
+
+static unsigned long div_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_regmap_div *divider = to_clk_regmap_div(hw);
+ struct clk_regmap *clkr = &divider->clkr;
+ u32 div;
+
+ regmap_read(clkr->regmap, divider->reg, &div);
+ div >>= divider->shift;
+ div &= BIT(divider->width) - 1;
+
+ return divider_recalc_rate(hw, parent_rate, div, NULL,
+ CLK_DIVIDER_ROUND_CLOSEST);
+}
+
+const struct clk_ops clk_regmap_div_ops = {
+ .enable = clk_enable_regmap,
+ .disable = clk_disable_regmap,
+ .round_rate = div_round_rate,
+ .set_rate = div_set_rate,
+ .recalc_rate = div_recalc_rate,
+};
+EXPORT_SYMBOL_GPL(clk_regmap_div_ops);
diff --git a/drivers/clk/qcom/clk-cdiv.h b/drivers/clk/qcom/clk-cdiv.h
new file mode 100644
index 000000000000..50aa338621d6
--- /dev/null
+++ b/drivers/clk/qcom/clk-cdiv.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __QCOM_CLK_CDIV_H__
+#define __QCOM_CLK_CDIV_H__
+
+#include <linux/clk-provider.h>
+#include "clk-regmap.h"
+
+struct clk_regmap_div {
+ u32 reg;
+ u32 shift;
+ u32 width;
+ struct clk_regmap clkr;
+};
+
+extern const struct clk_ops clk_regmap_div_ops;
+
+#endif