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>

4 files changed, 102 insertions, 1 deletions

diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
index 73a8c8fb547f..06ccce65d598 100644
--- a/drivers/clk/qcom/Kconfig
+++ b/drivers/clk/qcom/Kconfig
@@ -2,4 +2,4 @@ config COMMON_CLK_QCOM
         tristate "Support for Qualcomm's clock controllers"
         depends on OF
         select REGMAP_MMIO
-
+        select RESET_CONTROLLER
diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
index 1b4f75f58031..ec12ec4568ff 100644
--- a/drivers/clk/qcom/Makefile
+++ b/drivers/clk/qcom/Makefile
@@ -5,3 +5,4 @@ clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-pll.o
 clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-rcg.o
 clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-rcg2.o
 clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-branch.o
+clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += reset.o
diff --git a/drivers/clk/qcom/reset.c b/drivers/clk/qcom/reset.c
new file mode 100644
index 000000000000..6c977d3a8590
--- /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);
diff --git a/drivers/clk/qcom/reset.h b/drivers/clk/qcom/reset.h
new file mode 100644
index 000000000000..0e11e2130f97
--- /dev/null
+++ b/drivers/clk/qcom/reset.h
@@ -0,0 +1,37 @@
+/*
+ * 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.
+ */
+
+#ifndef __QCOM_CLK_RESET_H__
+#define __QCOM_CLK_RESET_H__
+
+#include <linux/reset-controller.h>
+
+struct qcom_reset_map {
+        unsigned int reg;
+        u8 bit;
+};
+
+struct regmap;
+
+struct qcom_reset_controller {
+        const struct qcom_reset_map *reset_map;
+        struct regmap *regmap;
+        struct reset_controller_dev rcdev;
+};
+
+#define to_qcom_reset_controller(r) \
+        container_of(r, struct qcom_reset_controller, rcdev);
+
+extern struct reset_control_ops qcom_reset_ops;
+
+#endif