clk: ti: divider: add support for legacy divider init

Legacy clock data is initialized slightly differently compared to
DT clocks, thus add support for this.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Michael Turquette <mturquette@linaro.org>

drivers/clk/ti/clk.c

@@ -214,6 +214,9 @@ struct clk __init *ti_clk_register_clk(struct ti_clk *setup)
 	case TI_CLK_MUX:
 		clk = ti_clk_register_mux(setup);
 		break;
+	case TI_CLK_DIVIDER:
+		clk = ti_clk_register_divider(setup);
+		break;
 	case TI_CLK_FIXED_FACTOR:
 		fixed_factor = setup->data;
 

drivers/clk/ti/clock.h

@@ -156,7 +156,9 @@ struct ti_clk_dpll {
 struct clk *ti_clk_register_gate(struct ti_clk *setup);
 struct clk *ti_clk_register_interface(struct ti_clk *setup);
 struct clk *ti_clk_register_mux(struct ti_clk *setup);
+struct clk *ti_clk_register_divider(struct ti_clk *setup);
 
+struct clk_hw *ti_clk_build_component_div(struct ti_clk_divider *setup);
 struct clk_hw *ti_clk_build_component_gate(struct ti_clk_gate *setup);
 struct clk_hw *ti_clk_build_component_mux(struct ti_clk_mux *setup);
 

drivers/clk/ti/divider.c

@@ -21,6 +21,7 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/clk/ti.h>
+#include "clock.h"
 
 #undef pr_fmt
 #define pr_fmt(fmt) "%s: " fmt, __func__
@@ -300,6 +301,134 @@ static struct clk *_register_divider(struct device *dev, const char *name,
 	return clk;
 }
 
+static struct clk_div_table *
+_get_div_table_from_setup(struct ti_clk_divider *setup, u8 *width)
+{
+	int valid_div = 0;
+	struct clk_div_table *table;
+	int i;
+	int div;
+	u32 val;
+	u8 flags;
+
+	if (!setup->num_dividers) {
+		/* Clk divider table not provided, determine min/max divs */
+		flags = setup->flags;
+
+		if (flags & CLKF_INDEX_STARTS_AT_ONE)
+			val = 1;
+		else
+			val = 0;
+
+		div = 1;
+
+		while (div < setup->max_div) {
+			if (flags & CLKF_INDEX_POWER_OF_TWO)
+				div <<= 1;
+			else
+				div++;
+			val++;
+		}
+
+		*width = fls(val);
+
+		return NULL;
+	}
+
+	for (i = 0; i < setup->num_dividers; i++)
+		if (setup->dividers[i])
+			valid_div++;
+
+	table = kzalloc(sizeof(*table) * (valid_div + 1), GFP_KERNEL);
+	if (!table)
+		return ERR_PTR(-ENOMEM);
+
+	valid_div = 0;
+	*width = 0;
+
+	for (i = 0; i < setup->num_dividers; i++)
+		if (setup->dividers[i]) {
+			table[valid_div].div = setup->dividers[i];
+			table[valid_div].val = i;
+			valid_div++;
+			*width = i;
+		}
+
+	*width = fls(*width);
+
+	return table;
+}
+
+struct clk_hw *ti_clk_build_component_div(struct ti_clk_divider *setup)
+{
+	struct clk_divider *div;
+	struct clk_omap_reg *reg;
+
+	if (!setup)
+		return NULL;
+
+	div = kzalloc(sizeof(*div), GFP_KERNEL);
+	if (!div)
+		return ERR_PTR(-ENOMEM);
+
+	reg = (struct clk_omap_reg *)&div->reg;
+	reg->index = setup->module;
+	reg->offset = setup->reg;
+
+	if (setup->flags & CLKF_INDEX_STARTS_AT_ONE)
+		div->flags |= CLK_DIVIDER_ONE_BASED;
+
+	if (setup->flags & CLKF_INDEX_POWER_OF_TWO)
+		div->flags |= CLK_DIVIDER_POWER_OF_TWO;
+
+	div->table = _get_div_table_from_setup(setup, &div->width);
+
+	div->shift = setup->bit_shift;
+
+	return &div->hw;
+}
+
+struct clk *ti_clk_register_divider(struct ti_clk *setup)
+{
+	struct ti_clk_divider *div;
+	struct clk_omap_reg *reg_setup;
+	u32 reg;
+	u8 width;
+	u32 flags = 0;
+	u8 div_flags = 0;
+	struct clk_div_table *table;
+	struct clk *clk;
+
+	div = setup->data;
+
+	reg_setup = (struct clk_omap_reg *)&reg;
+
+	reg_setup->index = div->module;
+	reg_setup->offset = div->reg;
+
+	if (div->flags & CLKF_INDEX_STARTS_AT_ONE)
+		div_flags |= CLK_DIVIDER_ONE_BASED;
+
+	if (div->flags & CLKF_INDEX_POWER_OF_TWO)
+		div_flags |= CLK_DIVIDER_POWER_OF_TWO;
+
+	if (div->flags & CLKF_SET_RATE_PARENT)
+		flags |= CLK_SET_RATE_PARENT;
+
+	table = _get_div_table_from_setup(div, &width);
+	if (IS_ERR(table))
+		return (struct clk *)table;
+
+	clk = _register_divider(NULL, setup->name, div->parent,
+				flags, (void __iomem *)reg, div->bit_shift,
+				width, div_flags, table, NULL);
+
+	if (IS_ERR(clk))
+		kfree(table);
+
+	return clk;
+}
+
 static struct clk_div_table *
 __init ti_clk_get_div_table(struct device_node *node)
 {
@@ -455,7 +584,8 @@ static void __init of_ti_divider_clk_setup(struct device_node *node)
 		goto cleanup;
 
 	clk = _register_divider(NULL, node->name, parent_name, flags, reg,
-				shift, width, clk_divider_flags, table, NULL);
+				shift, width, clk_divider_flags, table,
+				NULL);
 
 	if (!IS_ERR(clk)) {
 		of_clk_add_provider(node, of_clk_src_simple_get, clk);