clk: starfive: jh7100: Make hw clock implementation reusable

The JH7100 has additional audio and video clocks at different memory
ranges, but they use the same register layout. Add a header and export
the starfive_jh7100_clk_ops function so the clock implementation can be
reused by drivers handling these clocks.

Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Link: https://lore.kernel.org/r/20220126173953.1016706-6-kernel@esmil.dk
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

1 files changed, 97 insertions, 0 deletions

diff --git a/drivers/clk/starfive/clk-starfive-jh7100.h b/drivers/clk/starfive/clk-starfive-jh7100.h
new file mode 100644
index 000000000000..8eccd8c0a746
--- /dev/null
+++ b/drivers/clk/starfive/clk-starfive-jh7100.h
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __CLK_STARFIVE_JH7100_H
+#define __CLK_STARFIVE_JH7100_H
+
+#include <linux/bits.h>
+#include <linux/clk-provider.h>
+
+/* register fields */
+#define JH7100_CLK_ENABLE	BIT(31)
+#define JH7100_CLK_INVERT	BIT(30)
+#define JH7100_CLK_MUX_MASK	GENMASK(27, 24)
+#define JH7100_CLK_MUX_SHIFT	24
+#define JH7100_CLK_DIV_MASK	GENMASK(23, 0)
+#define JH7100_CLK_FRAC_MASK	GENMASK(15, 8)
+#define JH7100_CLK_FRAC_SHIFT	8
+#define JH7100_CLK_INT_MASK	GENMASK(7, 0)
+
+/* fractional divider min/max */
+#define JH7100_CLK_FRAC_MIN	100UL
+#define JH7100_CLK_FRAC_MAX	25599UL
+
+/* clock data */
+struct jh7100_clk_data {
+	const char *name;
+	unsigned long flags;
+	u32 max;
+	u8 parents[4];
+};
+
+#define JH7100_GATE(_idx, _name, _flags, _parent) [_idx] = {			\
+	.name = _name,								\
+	.flags = CLK_SET_RATE_PARENT | (_flags),				\
+	.max = JH7100_CLK_ENABLE,						\
+	.parents = { [0] = _parent },						\
+}
+
+#define JH7100__DIV(_idx, _name, _max, _parent) [_idx] = {			\
+	.name = _name,								\
+	.flags = 0,								\
+	.max = _max,								\
+	.parents = { [0] = _parent },						\
+}
+
+#define JH7100_GDIV(_idx, _name, _flags, _max, _parent) [_idx] = {		\
+	.name = _name,								\
+	.flags = _flags,							\
+	.max = JH7100_CLK_ENABLE | (_max),					\
+	.parents = { [0] = _parent },						\
+}
+
+#define JH7100_FDIV(_idx, _name, _parent) [_idx] = {				\
+	.name = _name,								\
+	.flags = 0,								\
+	.max = JH7100_CLK_FRAC_MAX,						\
+	.parents = { [0] = _parent },						\
+}
+
+#define JH7100__MUX(_idx, _name, _nparents, ...) [_idx] = {			\
+	.name = _name,								\
+	.flags = 0,								\
+	.max = ((_nparents) - 1) << JH7100_CLK_MUX_SHIFT,			\
+	.parents = { __VA_ARGS__ },						\
+}
+
+#define JH7100_GMUX(_idx, _name, _flags, _nparents, ...) [_idx] = {		\
+	.name = _name,								\
+	.flags = _flags,							\
+	.max = JH7100_CLK_ENABLE |						\
+		(((_nparents) - 1) << JH7100_CLK_MUX_SHIFT),			\
+	.parents = { __VA_ARGS__ },						\
+}
+
+#define JH7100__INV(_idx, _name, _parent) [_idx] = {				\
+	.name = _name,								\
+	.flags = CLK_SET_RATE_PARENT,						\
+	.max = JH7100_CLK_INVERT,						\
+	.parents = { [0] = _parent },						\
+}
+
+struct jh7100_clk {
+	struct clk_hw hw;
+	unsigned int idx;
+	unsigned int max_div;
+};
+
+struct jh7100_clk_priv {
+	/* protect clk enable and set rate/parent from happening at the same time */
+	spinlock_t rmw_lock;
+	struct device *dev;
+	void __iomem *base;
+	struct clk_hw *pll[3];
+	struct jh7100_clk reg[];
+};
+
+const struct clk_ops *starfive_jh7100_clk_ops(u32 max);
+
+#endif