1 files changed, 121 insertions, 0 deletions
diff --git a/drivers/clk/baikal-t1/ccu-div.h b/drivers/clk/baikal-t1/ccu-div.h
new file mode 100644
index 000000000..76d8ee44d
--- /dev/null
+++ b/drivers/clk/baikal-t1/ccu-div.h
@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
+ *
+ * Baikal-T1 CCU Dividers interface driver
+ */
+#ifndef __CLK_BT1_CCU_DIV_H__
+#define __CLK_BT1_CCU_DIV_H__
+
+#include <linux/clk-provider.h>
+#include <linux/spinlock.h>
+#include <linux/regmap.h>
+#include <linux/bits.h>
+#include <linux/of.h>
+
+/*
+ * CCU Divider private clock IDs
+ * @CCU_SYS_SATA_CLK: CCU SATA internal clock
+ * @CCU_SYS_XGMAC_CLK: CCU XGMAC internal clock
+ */
+#define CCU_SYS_SATA_CLK		-1
+#define CCU_SYS_XGMAC_CLK		-2
+
+/*
+ * CCU Divider private flags
+ * @CCU_DIV_BASIC: Basic divider clock required by the kernel as early as
+ *		   possible.
+ * @CCU_DIV_SKIP_ONE: Due to some reason divider can't be set to 1.
+ *		      It can be 0 though, which is functionally the same.
+ * @CCU_DIV_SKIP_ONE_TO_THREE: For some reason divider can't be within [1,3].
+ *			       It can be either 0 or greater than 3.
+ * @CCU_DIV_LOCK_SHIFTED: Find lock-bit at non-standard position.
+ * @CCU_DIV_RESET_DOMAIN: There is a clock domain reset handle.
+ */
+#define CCU_DIV_BASIC			BIT(0)
+#define CCU_DIV_SKIP_ONE		BIT(1)
+#define CCU_DIV_SKIP_ONE_TO_THREE	BIT(2)
+#define CCU_DIV_LOCK_SHIFTED		BIT(3)
+#define CCU_DIV_RESET_DOMAIN		BIT(4)
+
+/*
+ * enum ccu_div_type - CCU Divider types
+ * @CCU_DIV_VAR: Clocks gate with variable divider.
+ * @CCU_DIV_GATE: Clocks gate with fixed divider.
+ * @CCU_DIV_BUF: Clock gate with no divider.
+ * @CCU_DIV_FIXED: Ungateable clock with fixed divider.
+ */
+enum ccu_div_type {
+	CCU_DIV_VAR,
+	CCU_DIV_GATE,
+	CCU_DIV_BUF,
+	CCU_DIV_FIXED
+};
+
+/*
+ * struct ccu_div_init_data - CCU Divider initialization data
+ * @id: Clocks private identifier.
+ * @name: Clocks name.
+ * @parent_name: Parent clocks name in a fw node.
+ * @base: Divider register base address with respect to the sys_regs base.
+ * @sys_regs: Baikal-T1 System Controller registers map.
+ * @np: Pointer to the node describing the CCU Dividers.
+ * @type: CCU divider type (variable, fixed with and without gate).
+ * @width: Divider width if it's variable.
+ * @divider: Divider fixed value.
+ * @flags: CCU Divider clock flags.
+ * @features: CCU Divider private features.
+ */
+struct ccu_div_init_data {
+	unsigned int id;
+	const char *name;
+	const char *parent_name;
+	unsigned int base;
+	struct regmap *sys_regs;
+	struct device_node *np;
+	enum ccu_div_type type;
+	union {
+		unsigned int width;
+		unsigned int divider;
+	};
+	unsigned long flags;
+	unsigned long features;
+};
+
+/*
+ * struct ccu_div - CCU Divider descriptor
+ * @hw: clk_hw of the divider.
+ * @id: Clock private identifier.
+ * @reg_ctl: Divider control register base address.
+ * @sys_regs: Baikal-T1 System Controller registers map.
+ * @lock: Divider state change spin-lock.
+ * @mask: Divider field mask.
+ * @divider: Divider fixed value.
+ * @flags: Divider clock flags.
+ * @features: CCU Divider private features.
+ */
+struct ccu_div {
+	struct clk_hw hw;
+	unsigned int id;
+	unsigned int reg_ctl;
+	struct regmap *sys_regs;
+	spinlock_t lock;
+	union {
+		u32 mask;
+		unsigned int divider;
+	};
+	unsigned long flags;
+	unsigned long features;
+};
+#define to_ccu_div(_hw) container_of(_hw, struct ccu_div, hw)
+
+static inline struct clk_hw *ccu_div_get_clk_hw(struct ccu_div *div)
+{
+	return div ? &div->hw : NULL;
+}
+
+struct ccu_div *ccu_div_hw_register(const struct ccu_div_init_data *init);
+
+void ccu_div_hw_unregister(struct ccu_div *div);
+
+#endif /* __CLK_BT1_CCU_DIV_H__ */