openwrt/target/linux/ipq806x/patches-6.6/122-05-clk-qcom-clk-krait-generilize-div-functions.patch

From 908c361b3c3a139eb3e6a798cb620a6da7514d5c Mon Sep 17 00:00:00 2001
From: Christian Marangi <[email protected]>
Date: Fri, 23 Sep 2022 19:05:39 +0200
Subject: [PATCH 2/4] clk: qcom: clk-krait: generilize div functions

Generilize div functions and remove hardcode to a divisor of 2.
This is just a cleanup and permit to make it more clear the settings of
the devisor when used by the krait-cc driver.

Signed-off-by: Christian Marangi <[email protected]>
---
 drivers/clk/qcom/clk-krait.c | 57 ++++++++++++++++++++----------------
 drivers/clk/qcom/clk-krait.h | 11 ++++---
 drivers/clk/qcom/krait-cc.c  |  7 +++--
 3 files changed, 42 insertions(+), 33 deletions(-)

--- a/drivers/clk/qcom/clk-krait.c
+++ b/drivers/clk/qcom/clk-krait.c
@@ -97,53 +97,58 @@ const struct clk_ops krait_mux_clk_ops =
 EXPORT_SYMBOL_GPL(krait_mux_clk_ops);
 
 /* The divider can divide by 2, 4, 6 and 8. But we only really need div-2. */
-static long krait_div2_round_rate(struct clk_hw *hw, unsigned long rate,
+static long krait_div_round_rate(struct clk_hw *hw, unsigned long rate,
 				  unsigned long *parent_rate)
 {
-	*parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw), rate * 2);
-	return DIV_ROUND_UP(*parent_rate, 2);
+	struct krait_div_clk *d = to_krait_div_clk(hw);
+
+	*parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw),
+					 rate * d->divisor);
+
+	return DIV_ROUND_UP(*parent_rate, d->divisor);
 }
 
-static int krait_div2_set_rate(struct clk_hw *hw, unsigned long rate,
+static int krait_div_set_rate(struct clk_hw *hw, unsigned long rate,
 			       unsigned long parent_rate)
 {
-	struct krait_div2_clk *d = to_krait_div2_clk(hw);
+	struct krait_div_clk *d = to_krait_div_clk(hw);
+	u8 div_val = krait_div_to_val(d->divisor);
 	unsigned long flags;
-	u32 val;
-	u32 mask = BIT(d->width) - 1;
-
-	if (d->lpl)
-		mask = mask << (d->shift + LPL_SHIFT) | mask << d->shift;
-	else
-		mask <<= d->shift;
+	u32 regval;
 
 	spin_lock_irqsave(&krait_clock_reg_lock, flags);
-	val = krait_get_l2_indirect_reg(d->offset);
-	val &= ~mask;
-	krait_set_l2_indirect_reg(d->offset, val);
+	regval = krait_get_l2_indirect_reg(d->offset);
+
+	regval &= ~(d->mask << d->shift);
+	regval |= (div_val & d->mask) << d->shift;
+
+	if (d->lpl) {
+		regval &= ~(d->mask << (d->shift + LPL_SHIFT));
+		regval |= (div_val & d->mask) << (d->shift + LPL_SHIFT);
+	}
+
+	krait_set_l2_indirect_reg(d->offset, regval);
 	spin_unlock_irqrestore(&krait_clock_reg_lock, flags);
 
 	return 0;
 }
 
 static unsigned long
-krait_div2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+krait_div_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
 {
-	struct krait_div2_clk *d = to_krait_div2_clk(hw);
-	u32 mask = BIT(d->width) - 1;
+	struct krait_div_clk *d = to_krait_div_clk(hw);
 	u32 div;
 
 	div = krait_get_l2_indirect_reg(d->offset);
 	div >>= d->shift;
-	div &= mask;
-	div = (div + 1) * 2;
+	div &= d->mask;
 
-	return DIV_ROUND_UP(parent_rate, div);
+	return DIV_ROUND_UP(parent_rate, krait_val_to_div(div));
 }
 
-const struct clk_ops krait_div2_clk_ops = {
-	.round_rate = krait_div2_round_rate,
-	.set_rate = krait_div2_set_rate,
-	.recalc_rate = krait_div2_recalc_rate,
+const struct clk_ops krait_div_clk_ops = {
+	.round_rate = krait_div_round_rate,
+	.set_rate = krait_div_set_rate,
+	.recalc_rate = krait_div_recalc_rate,
 };
-EXPORT_SYMBOL_GPL(krait_div2_clk_ops);
+EXPORT_SYMBOL_GPL(krait_div_clk_ops);
--- a/drivers/clk/qcom/clk-krait.h
+++ b/drivers/clk/qcom/clk-krait.h
@@ -25,17 +25,20 @@ struct krait_mux_clk {
 
 extern const struct clk_ops krait_mux_clk_ops;
 
-struct krait_div2_clk {
+struct krait_div_clk {
 	u32		offset;
-	u8		width;
+	u32		mask;
+	u8		divisor;
 	u32		shift;
 	bool		lpl;
 
 	struct clk_hw	hw;
 };
 
-#define to_krait_div2_clk(_hw) container_of(_hw, struct krait_div2_clk, hw)
+#define to_krait_div_clk(_hw) container_of(_hw, struct krait_div_clk, hw)
+#define krait_div_to_val(_div)		((_div) / 2) - 1
+#define krait_val_to_div(_val)		((_val) + 1) * 2
 
-extern const struct clk_ops krait_div2_clk_ops;
+extern const struct clk_ops krait_div_clk_ops;
 
 #endif
--- a/drivers/clk/qcom/krait-cc.c
+++ b/drivers/clk/qcom/krait-cc.c
@@ -86,11 +86,11 @@ static int krait_notifier_register(struc
 static struct clk_hw *
 krait_add_div(struct device *dev, int id, const char *s, unsigned int offset)
 {
-	struct krait_div2_clk *div;
+	struct krait_div_clk *div;
 	static struct clk_parent_data p_data[1];
 	struct clk_init_data init = {
 		.num_parents = ARRAY_SIZE(p_data),
-		.ops = &krait_div2_clk_ops,
+		.ops = &krait_div_clk_ops,
 		.flags = CLK_SET_RATE_PARENT,
 	};
 	struct clk_hw *clk;
@@ -101,7 +101,8 @@ krait_add_div(struct device *dev, int id
 	if (!div)
 		return ERR_PTR(-ENOMEM);
 
-	div->width = 2;
+	div->mask = 0x3;
+	div->divisor = 2;
 	div->shift = 6;
 	div->lpl = id >= 0;
 	div->offset = offset;