X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fclk%2Fmmp%2Fclk-mix.c;fp=kernel%2Fdrivers%2Fclk%2Fmmp%2Fclk-mix.c;h=de6a873175d2b833f64d95f8e2bf5729da6fd1b4;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git

diff --git a/kernel/drivers/clk/mmp/clk-mix.c b/kernel/drivers/clk/mmp/clk-mix.c
new file mode 100644
index 000000000..de6a87317
--- /dev/null
+++ b/kernel/drivers/clk/mmp/clk-mix.c
@@ -0,0 +1,515 @@
+/*
+ * mmp mix(div and mux) clock operation source file
+ *
+ * Copyright (C) 2014 Marvell
+ * Chao Xie <chao.xie@marvell.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/err.h>
+
+#include "clk.h"
+
+/*
+ * The mix clock is a clock combined mux and div type clock.
+ * Because the div field and mux field need to be set at same
+ * time, we can not divide it into 2 types of clock
+ */
+
+#define to_clk_mix(hw)	container_of(hw, struct mmp_clk_mix, hw)
+
+static unsigned int _get_maxdiv(struct mmp_clk_mix *mix)
+{
+	unsigned int div_mask = (1 << mix->reg_info.width_div) - 1;
+	unsigned int maxdiv = 0;
+	struct clk_div_table *clkt;
+
+	if (mix->div_flags & CLK_DIVIDER_ONE_BASED)
+		return div_mask;
+	if (mix->div_flags & CLK_DIVIDER_POWER_OF_TWO)
+		return 1 << div_mask;
+	if (mix->div_table) {
+		for (clkt = mix->div_table; clkt->div; clkt++)
+			if (clkt->div > maxdiv)
+				maxdiv = clkt->div;
+		return maxdiv;
+	}
+	return div_mask + 1;
+}
+
+static unsigned int _get_div(struct mmp_clk_mix *mix, unsigned int val)
+{
+	struct clk_div_table *clkt;
+
+	if (mix->div_flags & CLK_DIVIDER_ONE_BASED)
+		return val;
+	if (mix->div_flags & CLK_DIVIDER_POWER_OF_TWO)
+		return 1 << val;
+	if (mix->div_table) {
+		for (clkt = mix->div_table; clkt->div; clkt++)
+			if (clkt->val == val)
+				return clkt->div;
+		if (clkt->div == 0)
+			return 0;
+	}
+	return val + 1;
+}
+
+static unsigned int _get_mux(struct mmp_clk_mix *mix, unsigned int val)
+{
+	int num_parents = __clk_get_num_parents(mix->hw.clk);
+	int i;
+
+	if (mix->mux_flags & CLK_MUX_INDEX_BIT)
+		return ffs(val) - 1;
+	if (mix->mux_flags & CLK_MUX_INDEX_ONE)
+		return val - 1;
+	if (mix->mux_table) {
+		for (i = 0; i < num_parents; i++)
+			if (mix->mux_table[i] == val)
+				return i;
+		if (i == num_parents)
+			return 0;
+	}
+
+	return val;
+}
+static unsigned int _get_div_val(struct mmp_clk_mix *mix, unsigned int div)
+{
+	struct clk_div_table *clkt;
+
+	if (mix->div_flags & CLK_DIVIDER_ONE_BASED)
+		return div;
+	if (mix->div_flags & CLK_DIVIDER_POWER_OF_TWO)
+		return __ffs(div);
+	if (mix->div_table) {
+		for (clkt = mix->div_table; clkt->div; clkt++)
+			if (clkt->div == div)
+				return clkt->val;
+		if (clkt->div == 0)
+			return 0;
+	}
+
+	return div - 1;
+}
+
+static unsigned int _get_mux_val(struct mmp_clk_mix *mix, unsigned int mux)
+{
+	if (mix->mux_table)
+		return mix->mux_table[mux];
+
+	return mux;
+}
+
+static void _filter_clk_table(struct mmp_clk_mix *mix,
+				struct mmp_clk_mix_clk_table *table,
+				unsigned int table_size)
+{
+	int i;
+	struct mmp_clk_mix_clk_table *item;
+	struct clk *parent, *clk;
+	unsigned long parent_rate;
+
+	clk = mix->hw.clk;
+
+	for (i = 0; i < table_size; i++) {
+		item = &table[i];
+		parent = clk_get_parent_by_index(clk, item->parent_index);
+		parent_rate = __clk_get_rate(parent);
+		if (parent_rate % item->rate) {
+			item->valid = 0;
+		} else {
+			item->divisor = parent_rate / item->rate;
+			item->valid = 1;
+		}
+	}
+}
+
+static int _set_rate(struct mmp_clk_mix *mix, u32 mux_val, u32 div_val,
+			unsigned int change_mux, unsigned int change_div)
+{
+	struct mmp_clk_mix_reg_info *ri = &mix->reg_info;
+	u8 width, shift;
+	u32 mux_div, fc_req;
+	int ret, timeout = 50;
+	unsigned long flags = 0;
+
+	if (!change_mux && !change_div)
+		return -EINVAL;
+
+	if (mix->lock)
+		spin_lock_irqsave(mix->lock, flags);
+
+	if (mix->type == MMP_CLK_MIX_TYPE_V1
+		|| mix->type == MMP_CLK_MIX_TYPE_V2)
+		mux_div = readl(ri->reg_clk_ctrl);
+	else
+		mux_div = readl(ri->reg_clk_sel);
+
+	if (change_div) {
+		width = ri->width_div;
+		shift = ri->shift_div;
+		mux_div &= ~MMP_CLK_BITS_MASK(width, shift);
+		mux_div |= MMP_CLK_BITS_SET_VAL(div_val, width, shift);
+	}
+
+	if (change_mux) {
+		width = ri->width_mux;
+		shift = ri->shift_mux;
+		mux_div &= ~MMP_CLK_BITS_MASK(width, shift);
+		mux_div |= MMP_CLK_BITS_SET_VAL(mux_val, width, shift);
+	}
+
+	if (mix->type == MMP_CLK_MIX_TYPE_V1) {
+		writel(mux_div, ri->reg_clk_ctrl);
+	} else if (mix->type == MMP_CLK_MIX_TYPE_V2) {
+		mux_div |= (1 << ri->bit_fc);
+		writel(mux_div, ri->reg_clk_ctrl);
+
+		do {
+			fc_req = readl(ri->reg_clk_ctrl);
+			timeout--;
+			if (!(fc_req & (1 << ri->bit_fc)))
+				break;
+		} while (timeout);
+
+		if (timeout == 0) {
+			pr_err("%s:%s cannot do frequency change\n",
+				__func__, __clk_get_name(mix->hw.clk));
+			ret = -EBUSY;
+			goto error;
+		}
+	} else {
+		fc_req = readl(ri->reg_clk_ctrl);
+		fc_req |= 1 << ri->bit_fc;
+		writel(fc_req, ri->reg_clk_ctrl);
+		writel(mux_div, ri->reg_clk_sel);
+		fc_req &= ~(1 << ri->bit_fc);
+	}
+
+	ret = 0;
+error:
+	if (mix->lock)
+		spin_unlock_irqrestore(mix->lock, flags);
+
+	return ret;
+}
+
+static long mmp_clk_mix_determine_rate(struct clk_hw *hw, unsigned long rate,
+					unsigned long min_rate,
+					unsigned long max_rate,
+					unsigned long *best_parent_rate,
+					struct clk_hw **best_parent_clk)
+{
+	struct mmp_clk_mix *mix = to_clk_mix(hw);
+	struct mmp_clk_mix_clk_table *item;
+	struct clk *parent, *parent_best, *mix_clk;
+	unsigned long parent_rate, mix_rate, mix_rate_best, parent_rate_best;
+	unsigned long gap, gap_best;
+	u32 div_val_max;
+	unsigned int div;
+	int i, j;
+
+	mix_clk = hw->clk;
+
+	parent = NULL;
+	mix_rate_best = 0;
+	parent_rate_best = 0;
+	gap_best = rate;
+	parent_best = NULL;
+
+	if (mix->table) {
+		for (i = 0; i < mix->table_size; i++) {
+			item = &mix->table[i];
+			if (item->valid == 0)
+				continue;
+			parent = clk_get_parent_by_index(mix_clk,
+							item->parent_index);
+			parent_rate = __clk_get_rate(parent);
+			mix_rate = parent_rate / item->divisor;
+			gap = abs(mix_rate - rate);
+			if (parent_best == NULL || gap < gap_best) {
+				parent_best = parent;
+				parent_rate_best = parent_rate;
+				mix_rate_best = mix_rate;
+				gap_best = gap;
+				if (gap_best == 0)
+					goto found;
+			}
+		}
+	} else {
+		for (i = 0; i < __clk_get_num_parents(mix_clk); i++) {
+			parent = clk_get_parent_by_index(mix_clk, i);
+			parent_rate = __clk_get_rate(parent);
+			div_val_max = _get_maxdiv(mix);
+			for (j = 0; j < div_val_max; j++) {
+				div = _get_div(mix, j);
+				mix_rate = parent_rate / div;
+				gap = abs(mix_rate - rate);
+				if (parent_best == NULL || gap < gap_best) {
+					parent_best = parent;
+					parent_rate_best = parent_rate;
+					mix_rate_best = mix_rate;
+					gap_best = gap;
+					if (gap_best == 0)
+						goto found;
+				}
+			}
+		}
+	}
+
+found:
+	*best_parent_rate = parent_rate_best;
+	*best_parent_clk = __clk_get_hw(parent_best);
+
+	return mix_rate_best;
+}
+
+static int mmp_clk_mix_set_rate_and_parent(struct clk_hw *hw,
+						unsigned long rate,
+						unsigned long parent_rate,
+						u8 index)
+{
+	struct mmp_clk_mix *mix = to_clk_mix(hw);
+	unsigned int div;
+	u32 div_val, mux_val;
+
+	div = parent_rate / rate;
+	div_val = _get_div_val(mix, div);
+	mux_val = _get_mux_val(mix, index);
+
+	return _set_rate(mix, mux_val, div_val, 1, 1);
+}
+
+static u8 mmp_clk_mix_get_parent(struct clk_hw *hw)
+{
+	struct mmp_clk_mix *mix = to_clk_mix(hw);
+	struct mmp_clk_mix_reg_info *ri = &mix->reg_info;
+	unsigned long flags = 0;
+	u32 mux_div = 0;
+	u8 width, shift;
+	u32 mux_val;
+
+	if (mix->lock)
+		spin_lock_irqsave(mix->lock, flags);
+
+	if (mix->type == MMP_CLK_MIX_TYPE_V1
+		|| mix->type == MMP_CLK_MIX_TYPE_V2)
+		mux_div = readl(ri->reg_clk_ctrl);
+	else
+		mux_div = readl(ri->reg_clk_sel);
+
+	if (mix->lock)
+		spin_unlock_irqrestore(mix->lock, flags);
+
+	width = mix->reg_info.width_mux;
+	shift = mix->reg_info.shift_mux;
+
+	mux_val = MMP_CLK_BITS_GET_VAL(mux_div, width, shift);
+
+	return _get_mux(mix, mux_val);
+}
+
+static unsigned long mmp_clk_mix_recalc_rate(struct clk_hw *hw,
+					unsigned long parent_rate)
+{
+	struct mmp_clk_mix *mix = to_clk_mix(hw);
+	struct mmp_clk_mix_reg_info *ri = &mix->reg_info;
+	unsigned long flags = 0;
+	u32 mux_div = 0;
+	u8 width, shift;
+	unsigned int div;
+
+	if (mix->lock)
+		spin_lock_irqsave(mix->lock, flags);
+
+	if (mix->type == MMP_CLK_MIX_TYPE_V1
+		|| mix->type == MMP_CLK_MIX_TYPE_V2)
+		mux_div = readl(ri->reg_clk_ctrl);
+	else
+		mux_div = readl(ri->reg_clk_sel);
+
+	if (mix->lock)
+		spin_unlock_irqrestore(mix->lock, flags);
+
+	width = mix->reg_info.width_div;
+	shift = mix->reg_info.shift_div;
+
+	div = _get_div(mix, MMP_CLK_BITS_GET_VAL(mux_div, width, shift));
+
+	return parent_rate / div;
+}
+
+static int mmp_clk_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct mmp_clk_mix *mix = to_clk_mix(hw);
+	struct mmp_clk_mix_clk_table *item;
+	int i;
+	u32 div_val, mux_val;
+
+	if (mix->table) {
+		for (i = 0; i < mix->table_size; i++) {
+			item = &mix->table[i];
+			if (item->valid == 0)
+				continue;
+			if (item->parent_index == index)
+				break;
+		}
+		if (i < mix->table_size) {
+			div_val = _get_div_val(mix, item->divisor);
+			mux_val = _get_mux_val(mix, item->parent_index);
+		} else
+			return -EINVAL;
+	} else {
+		mux_val = _get_mux_val(mix, index);
+		div_val = 0;
+	}
+
+	return _set_rate(mix, mux_val, div_val, 1, div_val ? 1 : 0);
+}
+
+static int mmp_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long best_parent_rate)
+{
+	struct mmp_clk_mix *mix = to_clk_mix(hw);
+	struct mmp_clk_mix_clk_table *item;
+	unsigned long parent_rate;
+	unsigned int best_divisor;
+	struct clk *mix_clk, *parent;
+	int i;
+
+	best_divisor = best_parent_rate / rate;
+
+	mix_clk = hw->clk;
+	if (mix->table) {
+		for (i = 0; i < mix->table_size; i++) {
+			item = &mix->table[i];
+			if (item->valid == 0)
+				continue;
+			parent = clk_get_parent_by_index(mix_clk,
+							item->parent_index);
+			parent_rate = __clk_get_rate(parent);
+			if (parent_rate == best_parent_rate
+				&& item->divisor == best_divisor)
+				break;
+		}
+		if (i < mix->table_size)
+			return _set_rate(mix,
+					_get_mux_val(mix, item->parent_index),
+					_get_div_val(mix, item->divisor),
+					1, 1);
+		else
+			return -EINVAL;
+	} else {
+		for (i = 0; i < __clk_get_num_parents(mix_clk); i++) {
+			parent = clk_get_parent_by_index(mix_clk, i);
+			parent_rate = __clk_get_rate(parent);
+			if (parent_rate == best_parent_rate)
+				break;
+		}
+		if (i < __clk_get_num_parents(mix_clk))
+			return _set_rate(mix, _get_mux_val(mix, i),
+					_get_div_val(mix, best_divisor), 1, 1);
+		else
+			return -EINVAL;
+	}
+}
+
+static void mmp_clk_mix_init(struct clk_hw *hw)
+{
+	struct mmp_clk_mix *mix = to_clk_mix(hw);
+
+	if (mix->table)
+		_filter_clk_table(mix, mix->table, mix->table_size);
+}
+
+const struct clk_ops mmp_clk_mix_ops = {
+	.determine_rate = mmp_clk_mix_determine_rate,
+	.set_rate_and_parent = mmp_clk_mix_set_rate_and_parent,
+	.set_rate = mmp_clk_set_rate,
+	.set_parent = mmp_clk_set_parent,
+	.get_parent = mmp_clk_mix_get_parent,
+	.recalc_rate = mmp_clk_mix_recalc_rate,
+	.init = mmp_clk_mix_init,
+};
+
+struct clk *mmp_clk_register_mix(struct device *dev,
+					const char *name,
+					const char **parent_names,
+					u8 num_parents,
+					unsigned long flags,
+					struct mmp_clk_mix_config *config,
+					spinlock_t *lock)
+{
+	struct mmp_clk_mix *mix;
+	struct clk *clk;
+	struct clk_init_data init;
+	size_t table_bytes;
+
+	mix = kzalloc(sizeof(*mix), GFP_KERNEL);
+	if (!mix) {
+		pr_err("%s:%s: could not allocate mmp mix clk\n",
+			__func__, name);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	init.name = name;
+	init.flags = flags | CLK_GET_RATE_NOCACHE;
+	init.parent_names = parent_names;
+	init.num_parents = num_parents;
+	init.ops = &mmp_clk_mix_ops;
+
+	memcpy(&mix->reg_info, &config->reg_info, sizeof(config->reg_info));
+	if (config->table) {
+		table_bytes = sizeof(*config->table) * config->table_size;
+		mix->table = kzalloc(table_bytes, GFP_KERNEL);
+		if (!mix->table) {
+			pr_err("%s:%s: could not allocate mmp mix table\n",
+				__func__, name);
+			kfree(mix);
+			return ERR_PTR(-ENOMEM);
+		}
+		memcpy(mix->table, config->table, table_bytes);
+		mix->table_size = config->table_size;
+	}
+
+	if (config->mux_table) {
+		table_bytes = sizeof(u32) * num_parents;
+		mix->mux_table = kzalloc(table_bytes, GFP_KERNEL);
+		if (!mix->mux_table) {
+			pr_err("%s:%s: could not allocate mmp mix mux-table\n",
+				__func__, name);
+			kfree(mix->table);
+			kfree(mix);
+			return ERR_PTR(-ENOMEM);
+		}
+		memcpy(mix->mux_table, config->mux_table, table_bytes);
+	}
+
+	mix->div_flags = config->div_flags;
+	mix->mux_flags = config->mux_flags;
+	mix->lock = lock;
+	mix->hw.init = &init;
+
+	if (config->reg_info.bit_fc >= 32)
+		mix->type = MMP_CLK_MIX_TYPE_V1;
+	else if (config->reg_info.reg_clk_sel)
+		mix->type = MMP_CLK_MIX_TYPE_V3;
+	else
+		mix->type = MMP_CLK_MIX_TYPE_V2;
+	clk = clk_register(dev, &mix->hw);
+
+	if (IS_ERR(clk)) {
+		kfree(mix->mux_table);
+		kfree(mix->table);
+		kfree(mix);
+	}
+
+	return clk;
+}