clk: qcom: Add support for branches/gate clocks

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
new file mode 100644
index 000000000000..284df3f3c55f
--- /dev/null
+++ b/drivers/clk/qcom/clk-branch.h
@@ -0,0 +1,56 @@
+/*
+ * 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_BRANCH_H__
+#define __QCOM_CLK_BRANCH_H__
+
+#include <linux/clk-provider.h>
+
+#include "clk-regmap.h"
+
+/**
+ * struct clk_branch - gating clock with status bit and dynamic hardware gating
+ *
+ * @hwcg_reg: dynamic hardware clock gating register
+ * @hwcg_bit: ORed with @hwcg_reg to enable dynamic hardware clock gating
+ * @halt_reg: halt register
+ * @halt_bit: ANDed with @halt_reg to test for clock halted
+ * @halt_check: type of halt checking to perform
+ * @clkr: handle between common and hardware-specific interfaces
+ *
+ * Clock which can gate its output.
+ */
+struct clk_branch {
+        u32     hwcg_reg;
+        u32     halt_reg;
+        u8      hwcg_bit;
+        u8      halt_bit;
+        u8      halt_check;
+#define BRANCH_VOTED                    BIT(7) /* Delay on disable */
+#define BRANCH_HALT                     0 /* pol: 1 = halt */
+#define BRANCH_HALT_VOTED               (BRANCH_HALT | BRANCH_VOTED)
+#define BRANCH_HALT_ENABLE              1 /* pol: 0 = halt */
+#define BRANCH_HALT_ENABLE_VOTED        (BRANCH_HALT_ENABLE | BRANCH_VOTED)
+#define BRANCH_HALT_DELAY               2 /* No bit to check; just delay */
+
+        struct clk_regmap clkr;
+};
+
+extern const struct clk_ops clk_branch_ops;
+extern const struct clk_ops clk_branch2_ops;
+extern const struct clk_ops clk_branch_simple_ops;
+
+#define to_clk_branch(_hw) \
+        container_of(to_clk_regmap(_hw), struct clk_branch, clkr)
+
+#endif