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-rw-r--r--drivers/clk/mmp/Makefile2
-rw-r--r--drivers/clk/mmp/clk-mix.c513
-rw-r--r--drivers/clk/mmp/clk.h66
3 files changed, 580 insertions, 1 deletions
diff --git a/drivers/clk/mmp/Makefile b/drivers/clk/mmp/Makefile
index 392d78044ce3..8bfee8605949 100644
--- a/drivers/clk/mmp/Makefile
+++ b/drivers/clk/mmp/Makefile
@@ -2,7 +2,7 @@
# Makefile for mmp specific clk
#
-obj-y += clk-apbc.o clk-apmu.o clk-frac.o
+obj-y += clk-apbc.o clk-apmu.o clk-frac.o clk-mix.o
obj-$(CONFIG_CPU_PXA168) += clk-pxa168.o
obj-$(CONFIG_CPU_PXA910) += clk-pxa910.o
diff --git a/drivers/clk/mmp/clk-mix.c b/drivers/clk/mmp/clk-mix.c
new file mode 100644
index 000000000000..b79742c47d53
--- /dev/null
+++ b/drivers/clk/mmp/clk-mix.c
@@ -0,0 +1,513 @@
+/*
+ * 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 *best_parent_rate,
+ struct clk **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 = 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;
+}
diff --git a/drivers/clk/mmp/clk.h b/drivers/clk/mmp/clk.h
index d267639ece2b..26b24699ccd7 100644
--- a/drivers/clk/mmp/clk.h
+++ b/drivers/clk/mmp/clk.h
@@ -37,6 +37,72 @@ extern struct clk *mmp_clk_register_factor(const char *name,
struct mmp_clk_factor_tbl *ftbl, unsigned int ftbl_cnt,
spinlock_t *lock);
+/* Clock type "mix" */
+#define MMP_CLK_BITS_MASK(width, shift) \
+ (((1 << (width)) - 1) << (shift))
+#define MMP_CLK_BITS_GET_VAL(data, width, shift) \
+ ((data & MMP_CLK_BITS_MASK(width, shift)) >> (shift))
+#define MMP_CLK_BITS_SET_VAL(val, width, shift) \
+ (((val) << (shift)) & MMP_CLK_BITS_MASK(width, shift))
+
+enum {
+ MMP_CLK_MIX_TYPE_V1,
+ MMP_CLK_MIX_TYPE_V2,
+ MMP_CLK_MIX_TYPE_V3,
+};
+
+/* The register layout */
+struct mmp_clk_mix_reg_info {
+ void __iomem *reg_clk_ctrl;
+ void __iomem *reg_clk_sel;
+ u8 width_div;
+ u8 shift_div;
+ u8 width_mux;
+ u8 shift_mux;
+ u8 bit_fc;
+};
+
+/* The suggested clock table from user. */
+struct mmp_clk_mix_clk_table {
+ unsigned long rate;
+ u8 parent_index;
+ unsigned int divisor;
+ unsigned int valid;
+};
+
+struct mmp_clk_mix_config {
+ struct mmp_clk_mix_reg_info reg_info;
+ struct mmp_clk_mix_clk_table *table;
+ unsigned int table_size;
+ u32 *mux_table;
+ struct clk_div_table *div_table;
+ u8 div_flags;
+ u8 mux_flags;
+};
+
+struct mmp_clk_mix {
+ struct clk_hw hw;
+ struct mmp_clk_mix_reg_info reg_info;
+ struct mmp_clk_mix_clk_table *table;
+ u32 *mux_table;
+ struct clk_div_table *div_table;
+ unsigned int table_size;
+ u8 div_flags;
+ u8 mux_flags;
+ unsigned int type;
+ spinlock_t *lock;
+};
+
+extern const struct clk_ops mmp_clk_mix_ops;
+extern struct clk *mmp_clk_register_mix(struct device *dev,
+ const char *name,
+ u8 num_parents,
+ const char **parent_names,
+ unsigned long flags,
+ struct mmp_clk_mix_config *config,
+ spinlock_t *lock);
+
+
extern struct clk *mmp_clk_register_pll2(const char *name,
const char *parent_name, unsigned long flags);
extern struct clk *mmp_clk_register_apbc(const char *name,
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 04:57:57 +0000