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-rw-r--r--drivers/clk/ti/Makefile2
-rw-r--r--drivers/clk/ti/composite.c2
-rw-r--r--drivers/clk/ti/divider.c487
3 files changed, 489 insertions, 2 deletions
diff --git a/drivers/clk/ti/Makefile b/drivers/clk/ti/Makefile
index ac4ea50672ed..8690b0b442c0 100644
--- a/drivers/clk/ti/Makefile
+++ b/drivers/clk/ti/Makefile
@@ -1,4 +1,4 @@
ifneq ($(CONFIG_OF),)
obj-y += clk.o autoidle.o
-clk-common = dpll.o composite.o
+clk-common = dpll.o composite.o divider.o
endif
diff --git a/drivers/clk/ti/composite.c b/drivers/clk/ti/composite.c
index 6539b650cae0..ffb8db4829bf 100644
--- a/drivers/clk/ti/composite.c
+++ b/drivers/clk/ti/composite.c
@@ -31,7 +31,7 @@
static unsigned long ti_composite_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
- return clk_divider_ops.recalc_rate(hw, parent_rate);
+ return ti_clk_divider_ops.recalc_rate(hw, parent_rate);
}
static long ti_composite_round_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/ti/divider.c b/drivers/clk/ti/divider.c
new file mode 100644
index 000000000000..a15e445570b2
--- /dev/null
+++ b/drivers/clk/ti/divider.c
@@ -0,0 +1,487 @@
+/*
+ * TI Divider Clock
+ *
+ * Copyright (C) 2013 Texas Instruments, Inc.
+ *
+ * Tero Kristo <t-kristo@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/clk/ti.h>
+
+#undef pr_fmt
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#define to_clk_divider(_hw) container_of(_hw, struct clk_divider, hw)
+
+#define div_mask(d) ((1 << ((d)->width)) - 1)
+
+static unsigned int _get_table_maxdiv(const struct clk_div_table *table)
+{
+ unsigned int maxdiv = 0;
+ const struct clk_div_table *clkt;
+
+ for (clkt = table; clkt->div; clkt++)
+ if (clkt->div > maxdiv)
+ maxdiv = clkt->div;
+ return maxdiv;
+}
+
+static unsigned int _get_maxdiv(struct clk_divider *divider)
+{
+ if (divider->flags & CLK_DIVIDER_ONE_BASED)
+ return div_mask(divider);
+ if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
+ return 1 << div_mask(divider);
+ if (divider->table)
+ return _get_table_maxdiv(divider->table);
+ return div_mask(divider) + 1;
+}
+
+static unsigned int _get_table_div(const struct clk_div_table *table,
+ unsigned int val)
+{
+ const struct clk_div_table *clkt;
+
+ for (clkt = table; clkt->div; clkt++)
+ if (clkt->val == val)
+ return clkt->div;
+ return 0;
+}
+
+static unsigned int _get_div(struct clk_divider *divider, unsigned int val)
+{
+ if (divider->flags & CLK_DIVIDER_ONE_BASED)
+ return val;
+ if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
+ return 1 << val;
+ if (divider->table)
+ return _get_table_div(divider->table, val);
+ return val + 1;
+}
+
+static unsigned int _get_table_val(const struct clk_div_table *table,
+ unsigned int div)
+{
+ const struct clk_div_table *clkt;
+
+ for (clkt = table; clkt->div; clkt++)
+ if (clkt->div == div)
+ return clkt->val;
+ return 0;
+}
+
+static unsigned int _get_val(struct clk_divider *divider, u8 div)
+{
+ if (divider->flags & CLK_DIVIDER_ONE_BASED)
+ return div;
+ if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
+ return __ffs(div);
+ if (divider->table)
+ return _get_table_val(divider->table, div);
+ return div - 1;
+}
+
+static unsigned long ti_clk_divider_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_divider *divider = to_clk_divider(hw);
+ unsigned int div, val;
+
+ val = ti_clk_ll_ops->clk_readl(divider->reg) >> divider->shift;
+ val &= div_mask(divider);
+
+ div = _get_div(divider, val);
+ if (!div) {
+ WARN(!(divider->flags & CLK_DIVIDER_ALLOW_ZERO),
+ "%s: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set\n",
+ __clk_get_name(hw->clk));
+ return parent_rate;
+ }
+
+ return parent_rate / div;
+}
+
+/*
+ * The reverse of DIV_ROUND_UP: The maximum number which
+ * divided by m is r
+ */
+#define MULT_ROUND_UP(r, m) ((r) * (m) + (m) - 1)
+
+static bool _is_valid_table_div(const struct clk_div_table *table,
+ unsigned int div)
+{
+ const struct clk_div_table *clkt;
+
+ for (clkt = table; clkt->div; clkt++)
+ if (clkt->div == div)
+ return true;
+ return false;
+}
+
+static bool _is_valid_div(struct clk_divider *divider, unsigned int div)
+{
+ if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
+ return is_power_of_2(div);
+ if (divider->table)
+ return _is_valid_table_div(divider->table, div);
+ return true;
+}
+
+static int ti_clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
+ unsigned long *best_parent_rate)
+{
+ struct clk_divider *divider = to_clk_divider(hw);
+ int i, bestdiv = 0;
+ unsigned long parent_rate, best = 0, now, maxdiv;
+ unsigned long parent_rate_saved = *best_parent_rate;
+
+ if (!rate)
+ rate = 1;
+
+ maxdiv = _get_maxdiv(divider);
+
+ if (!(__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT)) {
+ parent_rate = *best_parent_rate;
+ bestdiv = DIV_ROUND_UP(parent_rate, rate);
+ bestdiv = bestdiv == 0 ? 1 : bestdiv;
+ bestdiv = bestdiv > maxdiv ? maxdiv : bestdiv;
+ return bestdiv;
+ }
+
+ /*
+ * The maximum divider we can use without overflowing
+ * unsigned long in rate * i below
+ */
+ maxdiv = min(ULONG_MAX / rate, maxdiv);
+
+ for (i = 1; i <= maxdiv; i++) {
+ if (!_is_valid_div(divider, i))
+ continue;
+ if (rate * i == parent_rate_saved) {
+ /*
+ * It's the most ideal case if the requested rate can be
+ * divided from parent clock without needing to change
+ * parent rate, so return the divider immediately.
+ */
+ *best_parent_rate = parent_rate_saved;
+ return i;
+ }
+ parent_rate = __clk_round_rate(__clk_get_parent(hw->clk),
+ MULT_ROUND_UP(rate, i));
+ now = parent_rate / i;
+ if (now <= rate && now > best) {
+ bestdiv = i;
+ best = now;
+ *best_parent_rate = parent_rate;
+ }
+ }
+
+ if (!bestdiv) {
+ bestdiv = _get_maxdiv(divider);
+ *best_parent_rate =
+ __clk_round_rate(__clk_get_parent(hw->clk), 1);
+ }
+
+ return bestdiv;
+}
+
+static long ti_clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ int div;
+ div = ti_clk_divider_bestdiv(hw, rate, prate);
+
+ return *prate / div;
+}
+
+static int ti_clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_divider *divider = to_clk_divider(hw);
+ unsigned int div, value;
+ unsigned long flags = 0;
+ u32 val;
+
+ div = parent_rate / rate;
+ value = _get_val(divider, div);
+
+ if (value > div_mask(divider))
+ value = div_mask(divider);
+
+ if (divider->lock)
+ spin_lock_irqsave(divider->lock, flags);
+
+ if (divider->flags & CLK_DIVIDER_HIWORD_MASK) {
+ val = div_mask(divider) << (divider->shift + 16);
+ } else {
+ val = ti_clk_ll_ops->clk_readl(divider->reg);
+ val &= ~(div_mask(divider) << divider->shift);
+ }
+ val |= value << divider->shift;
+ ti_clk_ll_ops->clk_writel(val, divider->reg);
+
+ if (divider->lock)
+ spin_unlock_irqrestore(divider->lock, flags);
+
+ return 0;
+}
+
+const struct clk_ops ti_clk_divider_ops = {
+ .recalc_rate = ti_clk_divider_recalc_rate,
+ .round_rate = ti_clk_divider_round_rate,
+ .set_rate = ti_clk_divider_set_rate,
+};
+
+static struct clk *_register_divider(struct device *dev, const char *name,
+ const char *parent_name,
+ unsigned long flags, void __iomem *reg,
+ u8 shift, u8 width, u8 clk_divider_flags,
+ const struct clk_div_table *table,
+ spinlock_t *lock)
+{
+ struct clk_divider *div;
+ struct clk *clk;
+ struct clk_init_data init;
+
+ if (clk_divider_flags & CLK_DIVIDER_HIWORD_MASK) {
+ if (width + shift > 16) {
+ pr_warn("divider value exceeds LOWORD field\n");
+ return ERR_PTR(-EINVAL);
+ }
+ }
+
+ /* allocate the divider */
+ div = kzalloc(sizeof(*div), GFP_KERNEL);
+ if (!div) {
+ pr_err("%s: could not allocate divider clk\n", __func__);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ init.name = name;
+ init.ops = &ti_clk_divider_ops;
+ init.flags = flags | CLK_IS_BASIC;
+ init.parent_names = (parent_name ? &parent_name : NULL);
+ init.num_parents = (parent_name ? 1 : 0);
+
+ /* struct clk_divider assignments */
+ div->reg = reg;
+ div->shift = shift;
+ div->width = width;
+ div->flags = clk_divider_flags;
+ div->lock = lock;
+ div->hw.init = &init;
+ div->table = table;
+
+ /* register the clock */
+ clk = clk_register(dev, &div->hw);
+
+ if (IS_ERR(clk))
+ kfree(div);
+
+ return clk;
+}
+
+static struct clk_div_table
+__init *ti_clk_get_div_table(struct device_node *node)
+{
+ struct clk_div_table *table;
+ const __be32 *divspec;
+ u32 val;
+ u32 num_div;
+ u32 valid_div;
+ int i;
+
+ divspec = of_get_property(node, "ti,dividers", &num_div);
+
+ if (!divspec)
+ return NULL;
+
+ num_div /= 4;
+
+ valid_div = 0;
+
+ /* Determine required size for divider table */
+ for (i = 0; i < num_div; i++) {
+ of_property_read_u32_index(node, "ti,dividers", i, &val);
+ if (val)
+ valid_div++;
+ }
+
+ if (!valid_div) {
+ pr_err("no valid dividers for %s table\n", node->name);
+ return ERR_PTR(-EINVAL);
+ }
+
+ table = kzalloc(sizeof(*table) * (valid_div + 1), GFP_KERNEL);
+
+ if (!table)
+ return ERR_PTR(-ENOMEM);
+
+ valid_div = 0;
+
+ for (i = 0; i < num_div; i++) {
+ of_property_read_u32_index(node, "ti,dividers", i, &val);
+ if (val) {
+ table[valid_div].div = val;
+ table[valid_div].val = i;
+ valid_div++;
+ }
+ }
+
+ return table;
+}
+
+static int _get_divider_width(struct device_node *node,
+ const struct clk_div_table *table,
+ u8 flags)
+{
+ u32 min_div;
+ u32 max_div;
+ u32 val = 0;
+ u32 div;
+
+ if (!table) {
+ /* Clk divider table not provided, determine min/max divs */
+ if (of_property_read_u32(node, "ti,min-div", &min_div))
+ min_div = 1;
+
+ if (of_property_read_u32(node, "ti,max-div", &max_div)) {
+ pr_err("no max-div for %s!\n", node->name);
+ return -EINVAL;
+ }
+
+ /* Determine bit width for the field */
+ if (flags & CLK_DIVIDER_ONE_BASED)
+ val = 1;
+
+ div = min_div;
+
+ while (div < max_div) {
+ if (flags & CLK_DIVIDER_POWER_OF_TWO)
+ div <<= 1;
+ else
+ div++;
+ val++;
+ }
+ } else {
+ div = 0;
+
+ while (table[div].div) {
+ val = table[div].val;
+ div++;
+ }
+ }
+
+ return fls(val);
+}
+
+static int __init ti_clk_divider_populate(struct device_node *node,
+ void __iomem **reg, const struct clk_div_table **table,
+ u32 *flags, u8 *div_flags, u8 *width, u8 *shift)
+{
+ u32 val;
+
+ *reg = ti_clk_get_reg_addr(node, 0);
+ if (!*reg)
+ return -EINVAL;
+
+ if (!of_property_read_u32(node, "ti,bit-shift", &val))
+ *shift = val;
+ else
+ *shift = 0;
+
+ *flags = 0;
+ *div_flags = 0;
+
+ if (of_property_read_bool(node, "ti,index-starts-at-one"))
+ *div_flags |= CLK_DIVIDER_ONE_BASED;
+
+ if (of_property_read_bool(node, "ti,index-power-of-two"))
+ *div_flags |= CLK_DIVIDER_POWER_OF_TWO;
+
+ if (of_property_read_bool(node, "ti,set-rate-parent"))
+ *flags |= CLK_SET_RATE_PARENT;
+
+ *table = ti_clk_get_div_table(node);
+
+ if (IS_ERR(*table))
+ return PTR_ERR(*table);
+
+ *width = _get_divider_width(node, *table, *div_flags);
+
+ return 0;
+}
+
+/**
+ * of_ti_divider_clk_setup - Setup function for simple div rate clock
+ * @node: device node for this clock
+ *
+ * Sets up a basic divider clock.
+ */
+static void __init of_ti_divider_clk_setup(struct device_node *node)
+{
+ struct clk *clk;
+ const char *parent_name;
+ void __iomem *reg;
+ u8 clk_divider_flags = 0;
+ u8 width = 0;
+ u8 shift = 0;
+ const struct clk_div_table *table = NULL;
+ u32 flags = 0;
+
+ parent_name = of_clk_get_parent_name(node, 0);
+
+ if (ti_clk_divider_populate(node, &reg, &table, &flags,
+ &clk_divider_flags, &width, &shift))
+ goto cleanup;
+
+ clk = _register_divider(NULL, node->name, parent_name, flags, reg,
+ shift, width, clk_divider_flags, table, NULL);
+
+ if (!IS_ERR(clk)) {
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+ of_ti_clk_autoidle_setup(node);
+ return;
+ }
+
+cleanup:
+ kfree(table);
+}
+CLK_OF_DECLARE(divider_clk, "ti,divider-clock", of_ti_divider_clk_setup);
+
+static void __init of_ti_composite_divider_clk_setup(struct device_node *node)
+{
+ struct clk_divider *div;
+ u32 val;
+
+ div = kzalloc(sizeof(*div), GFP_KERNEL);
+ if (!div)
+ return;
+
+ if (ti_clk_divider_populate(node, &div->reg, &div->table, &val,
+ &div->flags, &div->width, &div->shift) < 0)
+ goto cleanup;
+
+ if (!ti_clk_add_component(node, &div->hw, CLK_COMPONENT_TYPE_DIVIDER))
+ return;
+
+cleanup:
+ kfree(div->table);
+ kfree(div);
+}
+CLK_OF_DECLARE(ti_composite_divider_clk, "ti,composite-divider-clock",
+ of_ti_composite_divider_clk_setup);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 03:26:06 +0100