clk: qcom: Add reset controller support
Reset controllers and clock controllers are combined into one IP
block on Qualcomm chipsets. Usually a reset signal is associated
with each clock branch but sometimes a reset signal is associated
with a handful of clocks. Either way the register interface is
the same; set a bit to assert a reset and clear a bit to deassert
a reset. Add support for these types of resets signals.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
diff --git a/drivers/clk/qcom/reset.c b/drivers/clk/qcom/reset.c
new file mode 100644
index 0000000..6c977d3
--- /dev/null
+++ b/drivers/clk/qcom/reset.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2013, 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/bitops.h>
+#include <linux/export.h>
+#include <linux/regmap.h>
+#include <linux/reset-controller.h>
+#include <linux/delay.h>
+
+#include "reset.h"
+
+static int qcom_reset(struct reset_controller_dev *rcdev, unsigned long id)
+{
+ rcdev->ops->assert(rcdev, id);
+ udelay(1);
+ rcdev->ops->deassert(rcdev, id);
+ return 0;
+}
+
+static int
+qcom_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
+{
+ struct qcom_reset_controller *rst;
+ const struct qcom_reset_map *map;
+ u32 mask;
+
+ rst = to_qcom_reset_controller(rcdev);
+ map = &rst->reset_map[id];
+ mask = BIT(map->bit);
+
+ return regmap_update_bits(rst->regmap, map->reg, mask, mask);
+}
+
+static int
+qcom_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
+{
+ struct qcom_reset_controller *rst;
+ const struct qcom_reset_map *map;
+ u32 mask;
+
+ rst = to_qcom_reset_controller(rcdev);
+ map = &rst->reset_map[id];
+ mask = BIT(map->bit);
+
+ return regmap_update_bits(rst->regmap, map->reg, mask, 0);
+}
+
+struct reset_control_ops qcom_reset_ops = {
+ .reset = qcom_reset,
+ .assert = qcom_reset_assert,
+ .deassert = qcom_reset_deassert,
+};
+EXPORT_SYMBOL_GPL(qcom_reset_ops);