clk: sophgo: Add clock support for CV1800 SoC

Add clock definition and driver code for CV1800 SoC.

Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Link: https://github.com/milkv-duo/duo-files/blob/6f4e9b8ecb459e017cca1a8df248a19ca70837a3/duo/datasheet/CV180X-Clock-v1.xlsx
Link: https://github.com/milkv-duo/duo-files/blob/6f4e9b8ecb459e017cca1a8df248a19ca70837a3/duo/datasheet/CV1800B-CV1801B-Preliminary-Datasheet-full-en.pdf
Link: https://lore.kernel.org/r/IA1PR20MB49534F37F802CAF117364D66BB262@IA1PR20MB4953.namprd20.prod.outlook.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/drivers/clk/sophgo/clk-cv18xx-common.c b/drivers/clk/sophgo/clk-cv18xx-common.c
new file mode 100644
index 000000000000..cbcdd88f0e23
--- /dev/null
+++ b/drivers/clk/sophgo/clk-cv18xx-common.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2023 Inochi Amaoto <inochiama@outlook.com>
+ */
+
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/spinlock.h>
+#include <linux/bug.h>
+
+#include "clk-cv18xx-common.h"
+
+int cv1800_clk_setbit(struct cv1800_clk_common *common,
+		      struct cv1800_clk_regbit *field)
+{
+	u32 mask = BIT(field->shift);
+	u32 value;
+	unsigned long flags;
+
+	spin_lock_irqsave(common->lock, flags);
+
+	value = readl(common->base + field->reg);
+	writel(value | mask, common->base + field->reg);
+
+	spin_unlock_irqrestore(common->lock, flags);
+
+	return 0;
+}
+
+int cv1800_clk_clearbit(struct cv1800_clk_common *common,
+			struct cv1800_clk_regbit *field)
+{
+	u32 mask = BIT(field->shift);
+	u32 value;
+	unsigned long flags;
+
+	spin_lock_irqsave(common->lock, flags);
+
+	value = readl(common->base + field->reg);
+	writel(value & ~mask, common->base + field->reg);
+
+	spin_unlock_irqrestore(common->lock, flags);
+
+	return 0;
+}
+
+int cv1800_clk_checkbit(struct cv1800_clk_common *common,
+			struct cv1800_clk_regbit *field)
+{
+	return readl(common->base + field->reg) & BIT(field->shift);
+}
+
+#define PLL_LOCK_TIMEOUT_US	(200 * 1000)
+
+void cv1800_clk_wait_for_lock(struct cv1800_clk_common *common,
+			      u32 reg, u32 lock)
+{
+	void __iomem *addr = common->base + reg;
+	u32 regval;
+
+	if (!lock)
+		return;
+
+	WARN_ON(readl_relaxed_poll_timeout(addr, regval, regval & lock,
+					   100, PLL_LOCK_TIMEOUT_US));
+}