clk: samsung: Use single CPU clock notifier callback for all chips

Reduce the code duplication by making all chips use a single version of
exynos_cpuclk_notifier_cb() function. That will prevent the code bloat
when adding new chips support too.

Also don't pass base address to pre/post rate change functions, as it
can be easily derived from already passed cpuclk param.

No functional change.

Signed-off-by: Sam Protsenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>

Author: Sam Protsenko

drivers/clk/samsung/clk-cpu.c

@@ -66,6 +66,11 @@
 #define DIV_MASK_ALL		GENMASK(31, 0)
 #define MUX_MASK		GENMASK(2, 0)
 
+struct exynos_cpuclk;
+
+typedef int (*exynos_rate_change_fn_t)(struct clk_notifier_data *ndata,
+				       struct exynos_cpuclk *cpuclk);
+
 /**
  * struct exynos_cpuclk - information about clock supplied to a CPU core
  * @hw:		handle between CCF and CPU clock
@@ -78,6 +83,8 @@
  * @clk_nb:	clock notifier registered for changes in clock speed of the
  *		primary parent clock
  * @flags:	configuration flags for the CPU clock
+ * @pre_rate_cb: callback to run before CPU clock rate change
+ * @post_rate_cb: callback to run after CPU clock rate change
  *
  * This structure holds information required for programming the CPU clock for
  * various clock speeds.
@@ -91,6 +98,9 @@ struct exynos_cpuclk {
 	const unsigned long			num_cfgs;
 	struct notifier_block			clk_nb;
 	unsigned long				flags;
+
+	exynos_rate_change_fn_t			pre_rate_cb;
+	exynos_rate_change_fn_t			post_rate_cb;
 };
 
 /*
@@ -178,9 +188,10 @@ static void exynos_set_safe_div(void __iomem *base, unsigned long div,
 
 /* handler for pre-rate change notification from parent clock */
 static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
-			struct exynos_cpuclk *cpuclk, void __iomem *base)
+					 struct exynos_cpuclk *cpuclk)
 {
 	const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
+	void __iomem *base = cpuclk->ctrl_base;
 	unsigned long alt_prate = clk_hw_get_rate(cpuclk->alt_parent);
 	unsigned long div0, div1 = 0, mux_reg;
 	unsigned long flags;
@@ -255,9 +266,10 @@ static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
 
 /* handler for post-rate change notification from parent clock */
 static int exynos_cpuclk_post_rate_change(struct clk_notifier_data *ndata,
-			struct exynos_cpuclk *cpuclk, void __iomem *base)
+					  struct exynos_cpuclk *cpuclk)
 {
 	const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
+	void __iomem *base = cpuclk->ctrl_base;
 	unsigned long div = 0, div_mask = DIV_MASK;
 	unsigned long mux_reg;
 	unsigned long flags;
@@ -306,9 +318,10 @@ static void exynos5433_set_safe_div(void __iomem *base, unsigned long div,
 
 /* handler for pre-rate change notification from parent clock */
 static int exynos5433_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
-			struct exynos_cpuclk *cpuclk, void __iomem *base)
+					     struct exynos_cpuclk *cpuclk)
 {
 	const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
+	void __iomem *base = cpuclk->ctrl_base;
 	unsigned long alt_prate = clk_hw_get_rate(cpuclk->alt_parent);
 	unsigned long div0, div1 = 0, mux_reg;
 	unsigned long flags;
@@ -366,8 +379,9 @@ static int exynos5433_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
 
 /* handler for post-rate change notification from parent clock */
 static int exynos5433_cpuclk_post_rate_change(struct clk_notifier_data *ndata,
-			struct exynos_cpuclk *cpuclk, void __iomem *base)
+					      struct exynos_cpuclk *cpuclk)
 {
+	void __iomem *base = cpuclk->ctrl_base;
 	unsigned long div = 0, div_mask = DIV_MASK;
 	unsigned long mux_reg;
 	unsigned long flags;
@@ -393,39 +407,14 @@ static int exynos_cpuclk_notifier_cb(struct notifier_block *nb,
 {
 	struct clk_notifier_data *ndata = data;
 	struct exynos_cpuclk *cpuclk;
-	void __iomem *base;
 	int err = 0;
 
 	cpuclk = container_of(nb, struct exynos_cpuclk, clk_nb);
-	base = cpuclk->ctrl_base;
 
 	if (event == PRE_RATE_CHANGE)
-		err = exynos_cpuclk_pre_rate_change(ndata, cpuclk, base);
+		err = cpuclk->pre_rate_cb(ndata, cpuclk);
 	else if (event == POST_RATE_CHANGE)
-		err = exynos_cpuclk_post_rate_change(ndata, cpuclk, base);
-
-	return notifier_from_errno(err);
-}
-
-/*
- * This notifier function is called for the pre-rate and post-rate change
- * notifications of the parent clock of cpuclk.
- */
-static int exynos5433_cpuclk_notifier_cb(struct notifier_block *nb,
-					 unsigned long event, void *data)
-{
-	struct clk_notifier_data *ndata = data;
-	struct exynos_cpuclk *cpuclk;
-	void __iomem *base;
-	int err = 0;
-
-	cpuclk = container_of(nb, struct exynos_cpuclk, clk_nb);
-	base = cpuclk->ctrl_base;
-
-	if (event == PRE_RATE_CHANGE)
-		err = exynos5433_cpuclk_pre_rate_change(ndata, cpuclk, base);
-	else if (event == POST_RATE_CHANGE)
-		err = exynos5433_cpuclk_post_rate_change(ndata, cpuclk, base);
+		err = cpuclk->post_rate_cb(ndata, cpuclk);
 
 	return notifier_from_errno(err);
 }
@@ -467,10 +456,14 @@ static int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
 	cpuclk->ctrl_base = ctx->reg_base + clk_data->offset;
 	cpuclk->lock = &ctx->lock;
 	cpuclk->flags = clk_data->flags;
-	if (clk_data->flags & CLK_CPU_HAS_E5433_REGS_LAYOUT)
-		cpuclk->clk_nb.notifier_call = exynos5433_cpuclk_notifier_cb;
-	else
-		cpuclk->clk_nb.notifier_call = exynos_cpuclk_notifier_cb;
+	cpuclk->clk_nb.notifier_call = exynos_cpuclk_notifier_cb;
+	if (clk_data->flags & CLK_CPU_HAS_E5433_REGS_LAYOUT) {
+		cpuclk->pre_rate_cb = exynos5433_cpuclk_pre_rate_change;
+		cpuclk->post_rate_cb = exynos5433_cpuclk_post_rate_change;
+	} else {
+		cpuclk->pre_rate_cb = exynos_cpuclk_pre_rate_change;
+		cpuclk->post_rate_cb = exynos_cpuclk_post_rate_change;
+	}
 
 	ret = clk_notifier_register(parent->clk, &cpuclk->clk_nb);
 	if (ret) {