clk: mvebu: refactor corediv driver to support more SoC

This commit refactors the corediv clock driver so that it is capable
of handling various SOCs that have slightly different corediv clock
registers and capabilities.

It introduces a clk_corediv_soc_desc structure that encapsulates all
the SoC specific details.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

drivers/clk/mvebu/clk-corediv.c

@@ -18,9 +18,6 @@
 #include "common.h"
 
 #define CORE_CLK_DIV_RATIO_MASK		0xff
-#define CORE_CLK_DIV_RATIO_RELOAD	BIT(8)
-#define CORE_CLK_DIV_ENABLE_OFFSET	24
-#define CORE_CLK_DIV_RATIO_OFFSET	0x8
 
 /*
  * This structure describes the hardware details (bit offset and mask)
@@ -35,6 +32,21 @@ struct clk_corediv_desc {
 	unsigned int fieldbit;
 };
 
+/*
+ * This structure describes the hardware details to configure the core
+ * divider clocks on a given SoC. Amongst others, it points to the
+ * array of core divider clock descriptors for this SoC, as well as
+ * the corresponding operations to manipulate them.
+ */
+struct clk_corediv_soc_desc {
+	const struct clk_corediv_desc *descs;
+	unsigned int ndescs;
+	const struct clk_ops ops;
+	u32 ratio_reload;
+	u32 enable_bit_offset;
+	u32 ratio_offset;
+};
+
 /*
  * This structure represents one core divider clock for the clock
  * framework, and is dynamically allocated for each core divider clock
@@ -44,6 +56,7 @@ struct clk_corediv {
 	struct clk_hw hw;
 	void __iomem *reg;
 	const struct clk_corediv_desc *desc;
+	const struct clk_corediv_soc_desc *soc_desc;
 	spinlock_t lock;
 };
 
@@ -63,8 +76,9 @@ static const struct clk_corediv_desc mvebu_corediv_desc[] = {
 static int clk_corediv_is_enabled(struct clk_hw *hwclk)
 {
 	struct clk_corediv *corediv = to_corediv_clk(hwclk);
+	const struct clk_corediv_soc_desc *soc_desc = corediv->soc_desc;
 	const struct clk_corediv_desc *desc = corediv->desc;
-	u32 enable_mask = BIT(desc->fieldbit) << CORE_CLK_DIV_ENABLE_OFFSET;
+	u32 enable_mask = BIT(desc->fieldbit) << soc_desc->enable_bit_offset;
 
 	return !!(readl(corediv->reg) & enable_mask);
 }
@@ -72,6 +86,7 @@ static int clk_corediv_is_enabled(struct clk_hw *hwclk)
 static int clk_corediv_enable(struct clk_hw *hwclk)
 {
 	struct clk_corediv *corediv = to_corediv_clk(hwclk);
+	const struct clk_corediv_soc_desc *soc_desc = corediv->soc_desc;
 	const struct clk_corediv_desc *desc = corediv->desc;
 	unsigned long flags = 0;
 	u32 reg;
@@ -79,7 +94,7 @@ static int clk_corediv_enable(struct clk_hw *hwclk)
 	spin_lock_irqsave(&corediv->lock, flags);
 
 	reg = readl(corediv->reg);
-	reg |= (BIT(desc->fieldbit) << CORE_CLK_DIV_ENABLE_OFFSET);
+	reg |= (BIT(desc->fieldbit) << soc_desc->enable_bit_offset);
 	writel(reg, corediv->reg);
 
 	spin_unlock_irqrestore(&corediv->lock, flags);
@@ -90,6 +105,7 @@ static int clk_corediv_enable(struct clk_hw *hwclk)
 static void clk_corediv_disable(struct clk_hw *hwclk)
 {
 	struct clk_corediv *corediv = to_corediv_clk(hwclk);
+	const struct clk_corediv_soc_desc *soc_desc = corediv->soc_desc;
 	const struct clk_corediv_desc *desc = corediv->desc;
 	unsigned long flags = 0;
 	u32 reg;
@@ -97,7 +113,7 @@ static void clk_corediv_disable(struct clk_hw *hwclk)
 	spin_lock_irqsave(&corediv->lock, flags);
 
 	reg = readl(corediv->reg);
-	reg &= ~(BIT(desc->fieldbit) << CORE_CLK_DIV_ENABLE_OFFSET);
+	reg &= ~(BIT(desc->fieldbit) << soc_desc->enable_bit_offset);
 	writel(reg, corediv->reg);
 
 	spin_unlock_irqrestore(&corediv->lock, flags);
@@ -107,10 +123,11 @@ static unsigned long clk_corediv_recalc_rate(struct clk_hw *hwclk,
 					 unsigned long parent_rate)
 {
 	struct clk_corediv *corediv = to_corediv_clk(hwclk);
+	const struct clk_corediv_soc_desc *soc_desc = corediv->soc_desc;
 	const struct clk_corediv_desc *desc = corediv->desc;
 	u32 reg, div;
 
-	reg = readl(corediv->reg + CORE_CLK_DIV_RATIO_OFFSET);
+	reg = readl(corediv->reg + soc_desc->ratio_offset);
 	div = (reg >> desc->offset) & desc->mask;
 	return parent_rate / div;
 }
@@ -134,6 +151,7 @@ static int clk_corediv_set_rate(struct clk_hw *hwclk, unsigned long rate,
 			    unsigned long parent_rate)
 {
 	struct clk_corediv *corediv = to_corediv_clk(hwclk);
+	const struct clk_corediv_soc_desc *soc_desc = corediv->soc_desc;
 	const struct clk_corediv_desc *desc = corediv->desc;
 	unsigned long flags = 0;
 	u32 reg, div;
@@ -143,17 +161,17 @@ static int clk_corediv_set_rate(struct clk_hw *hwclk, unsigned long rate,
 	spin_lock_irqsave(&corediv->lock, flags);
 
 	/* Write new divider to the divider ratio register */
-	reg = readl(corediv->reg + CORE_CLK_DIV_RATIO_OFFSET);
+	reg = readl(corediv->reg + soc_desc->ratio_offset);
 	reg &= ~(desc->mask << desc->offset);
 	reg |= (div & desc->mask) << desc->offset;
-	writel(reg, corediv->reg + CORE_CLK_DIV_RATIO_OFFSET);
+	writel(reg, corediv->reg + soc_desc->ratio_offset);
 
 	/* Set reload-force for this clock */
 	reg = readl(corediv->reg) | BIT(desc->fieldbit);
 	writel(reg, corediv->reg);
 
 	/* Now trigger the clock update */
-	reg = readl(corediv->reg) | CORE_CLK_DIV_RATIO_RELOAD;
+	reg = readl(corediv->reg) | soc_desc->ratio_reload;
 	writel(reg, corediv->reg);
 
 	/*
@@ -161,7 +179,7 @@ static int clk_corediv_set_rate(struct clk_hw *hwclk, unsigned long rate,
 	 * ratios request and the reload request.
 	 */
 	udelay(1000);
-	reg &= ~(CORE_CLK_DIV_RATIO_MASK | CORE_CLK_DIV_RATIO_RELOAD);
+	reg &= ~(CORE_CLK_DIV_RATIO_MASK | soc_desc->ratio_reload);
 	writel(reg, corediv->reg);
 	udelay(1000);
 
@@ -170,16 +188,25 @@ static int clk_corediv_set_rate(struct clk_hw *hwclk, unsigned long rate,
 	return 0;
 }
 
-static const struct clk_ops corediv_ops = {
+static const struct clk_corediv_soc_desc armada370_corediv_soc = {
+	.descs = mvebu_corediv_desc,
+	.ndescs = ARRAY_SIZE(mvebu_corediv_desc),
+	.ops = {
 		.enable = clk_corediv_enable,
 		.disable = clk_corediv_disable,
 		.is_enabled = clk_corediv_is_enabled,
 		.recalc_rate = clk_corediv_recalc_rate,
 		.round_rate = clk_corediv_round_rate,
 		.set_rate = clk_corediv_set_rate,
+	},
+	.ratio_reload = BIT(8),
+	.enable_bit_offset = 24,
+	.ratio_offset = 0x8,
 };
 
-static void __init mvebu_corediv_clk_init(struct device_node *node)
+static void __init
+mvebu_corediv_clk_init(struct device_node *node,
+		       const struct clk_corediv_soc_desc *soc_desc)
 {
 	struct clk_init_data init;
 	struct clk_corediv *corediv;
@@ -195,7 +222,7 @@ static void __init mvebu_corediv_clk_init(struct device_node *node)
 
 	parent_name = of_clk_get_parent_name(node, 0);
 
-	clk_data.clk_num = ARRAY_SIZE(mvebu_corediv_desc);
+	clk_data.clk_num = soc_desc->ndescs;
 
 	/* clks holds the clock array */
 	clks = kcalloc(clk_data.clk_num, sizeof(struct clk *),
@@ -216,10 +243,11 @@ static void __init mvebu_corediv_clk_init(struct device_node *node)
 		init.num_parents = 1;
 		init.parent_names = &parent_name;
 		init.name = clk_name;
-		init.ops = &corediv_ops;
+		init.ops = &soc_desc->ops;
 		init.flags = 0;
 
-		corediv[i].desc = mvebu_corediv_desc + i;
+		corediv[i].soc_desc = soc_desc;
+		corediv[i].desc = soc_desc->descs + i;
 		corediv[i].reg = base;
 		corediv[i].hw.init = &init;
 
@@ -236,5 +264,10 @@ static void __init mvebu_corediv_clk_init(struct device_node *node)
 err_unmap:
 	iounmap(base);
 }
-CLK_OF_DECLARE(mvebu_corediv_clk, "marvell,armada-370-corediv-clock",
-	       mvebu_corediv_clk_init);
+
+static void __init armada370_corediv_clk_init(struct device_node *node)
+{
+	return mvebu_corediv_clk_init(node, &armada370_corediv_soc);
+}
+CLK_OF_DECLARE(armada370_corediv_clk, "marvell,armada-370-corediv-clock",
+	       armada370_corediv_clk_init);