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path: root/drivers/clk/stm32/clk-stm32-core.c
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-rw-r--r--drivers/clk/stm32/clk-stm32-core.c680
1 files changed, 680 insertions, 0 deletions
diff --git a/drivers/clk/stm32/clk-stm32-core.c b/drivers/clk/stm32/clk-stm32-core.c
new file mode 100644
index 0000000000..5d83c8c807
--- /dev/null
+++ b/drivers/clk/stm32/clk-stm32-core.c
@@ -0,0 +1,680 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) STMicroelectronics 2022 - All Rights Reserved
+ * Author: Gabriel Fernandez <gabriel.fernandez@foss.st.com> for STMicroelectronics.
+ */
+
+#include <linux/clk-provider.h>
+#include <clock.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <of.h>
+#include <of_address.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include "clk-stm32-core.h"
+#include "reset-stm32.h"
+
+static DEFINE_SPINLOCK(rlock);
+
+static int stm32_rcc_clock_init(struct device *dev,
+ const struct of_device_id *match,
+ void __iomem *base)
+{
+ const struct stm32_rcc_match_data *data = match->data;
+ struct clk_hw_onecell_data *clk_data = data->hw_clks;
+ struct device_node *np = dev_of_node(dev);
+ struct clk_hw **hws;
+ int n, max_binding;
+
+ max_binding = data->maxbinding;
+
+ clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, max_binding), GFP_KERNEL);
+ if (!clk_data)
+ return -ENOMEM;
+
+ clk_data->num = max_binding;
+
+ hws = clk_data->hws;
+
+ for (n = 0; n < max_binding; n++)
+ hws[n] = ERR_PTR(-ENOENT);
+
+ for (n = 0; n < data->num_clocks; n++) {
+ const struct clock_config *cfg_clock = &data->tab_clocks[n];
+ struct clk_hw *hw = ERR_PTR(-ENOENT);
+
+ if (data->check_security &&
+ data->check_security(base, cfg_clock))
+ continue;
+
+ if (cfg_clock->func)
+ hw = (*cfg_clock->func)(dev, data, base, &rlock,
+ cfg_clock);
+
+ if (IS_ERR(hw)) {
+ dev_err(dev, "Can't register clk %d: %ld\n", n,
+ PTR_ERR(hw));
+ return PTR_ERR(hw);
+ }
+
+ if (cfg_clock->id != NO_ID)
+ hws[cfg_clock->id] = hw;
+ }
+
+ return of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_data);
+}
+
+int stm32_rcc_init(struct device *dev, const struct of_device_id *match_data,
+ void __iomem *base)
+{
+ const struct of_device_id *match;
+ int err;
+
+ match = of_match_node(match_data, dev_of_node(dev));
+ if (!match) {
+ dev_err(dev, "match data not found\n");
+ return -ENODEV;
+ }
+
+ /* RCC Reset Configuration */
+ err = stm32_rcc_reset_init(dev, match, base);
+ if (err) {
+ pr_err("stm32 reset failed to initialize\n");
+ return err;
+ }
+
+ /* RCC Clock Configuration */
+ err = stm32_rcc_clock_init(dev, match, base);
+ if (err) {
+ pr_err("stm32 clock failed to initialize\n");
+ return err;
+ }
+
+ return 0;
+}
+
+static u8 stm32_mux_get_parent(void __iomem *base,
+ struct clk_stm32_clock_data *data,
+ u16 mux_id)
+{
+ const struct stm32_mux_cfg *mux = &data->muxes[mux_id];
+ u32 mask = BIT(mux->width) - 1;
+ u32 val;
+
+ val = readl(base + mux->offset) >> mux->shift;
+ val &= mask;
+
+ return val;
+}
+
+static int stm32_mux_set_parent(void __iomem *base,
+ struct clk_stm32_clock_data *data,
+ u16 mux_id, u8 index)
+{
+ const struct stm32_mux_cfg *mux = &data->muxes[mux_id];
+
+ u32 mask = BIT(mux->width) - 1;
+ u32 reg = readl(base + mux->offset);
+ u32 val = index << mux->shift;
+
+ reg &= ~(mask << mux->shift);
+ reg |= val;
+
+ writel(reg, base + mux->offset);
+
+ return 0;
+}
+
+static void stm32_gate_endisable(void __iomem *base,
+ struct clk_stm32_clock_data *data,
+ u16 gate_id, int enable)
+{
+ const struct stm32_gate_cfg *gate = &data->gates[gate_id];
+ void __iomem *addr = base + gate->offset;
+
+ if (enable) {
+ if (data->gate_cpt[gate_id]++ > 0)
+ return;
+
+ if (gate->set_clr != 0)
+ writel(BIT(gate->bit_idx), addr);
+ else
+ writel(readl(addr) | BIT(gate->bit_idx), addr);
+ } else {
+ if (--data->gate_cpt[gate_id] > 0)
+ return;
+
+ if (gate->set_clr != 0)
+ writel(BIT(gate->bit_idx), addr + gate->set_clr);
+ else
+ writel(readl(addr) & ~BIT(gate->bit_idx), addr);
+ }
+}
+
+static int stm32_gate_is_enabled(void __iomem *base,
+ struct clk_stm32_clock_data *data,
+ u16 gate_id)
+{
+ const struct stm32_gate_cfg *gate = &data->gates[gate_id];
+
+ return (readl(base + gate->offset) & BIT(gate->bit_idx)) != 0;
+}
+
+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(const struct clk_div_table *table,
+ unsigned int val, unsigned long flags, u8 width)
+{
+ if (flags & CLK_DIVIDER_ONE_BASED)
+ return val;
+ if (flags & CLK_DIVIDER_POWER_OF_TWO)
+ return 1 << val;
+ if (table)
+ return _get_table_div(table, val);
+ return val + 1;
+}
+
+static unsigned long stm32_divider_get_rate(void __iomem *base,
+ struct clk_stm32_clock_data *data,
+ u16 div_id,
+ unsigned long parent_rate)
+{
+ const struct stm32_div_cfg *divider = &data->dividers[div_id];
+ unsigned int val;
+ unsigned int div;
+
+ val = readl(base + divider->offset) >> divider->shift;
+ val &= clk_div_mask(divider->width);
+ div = _get_div(divider->table, val, divider->flags, divider->width);
+
+ if (!div) {
+ WARN(!(divider->flags & CLK_DIVIDER_ALLOW_ZERO),
+ "%d: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set\n",
+ div_id);
+ return parent_rate;
+ }
+
+ return DIV_ROUND_UP_ULL((u64)parent_rate, div);
+}
+
+static int stm32_divider_set_rate(void __iomem *base,
+ struct clk_stm32_clock_data *data,
+ u16 div_id, unsigned long rate,
+ unsigned long parent_rate)
+{
+ const struct stm32_div_cfg *divider = &data->dividers[div_id];
+ int value;
+ u32 val;
+
+ value = divider_get_val(rate, parent_rate, divider->table,
+ divider->width, divider->flags);
+ if (value < 0)
+ return value;
+
+ if (divider->flags & CLK_DIVIDER_HIWORD_MASK) {
+ val = clk_div_mask(divider->width) << (divider->shift + 16);
+ } else {
+ val = readl(base + divider->offset);
+ val &= ~(clk_div_mask(divider->width) << divider->shift);
+ }
+
+ val |= (u32)value << divider->shift;
+
+ writel(val, base + divider->offset);
+
+ return 0;
+}
+
+static int clk_stm32_mux_get_parent(struct clk_hw *hw)
+{
+ struct clk_stm32_mux *mux = to_clk_stm32_mux(hw);
+
+ return stm32_mux_get_parent(mux->base, mux->clock_data, mux->mux_id);
+}
+
+static int clk_stm32_mux_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_stm32_mux *mux = to_clk_stm32_mux(hw);
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(mux->lock, flags);
+
+ stm32_mux_set_parent(mux->base, mux->clock_data, mux->mux_id, index);
+
+ spin_unlock_irqrestore(mux->lock, flags);
+
+ return 0;
+}
+
+const struct clk_ops clk_stm32_mux_ops = {
+ .round_rate = clk_mux_round_rate,
+ .get_parent = clk_stm32_mux_get_parent,
+ .set_parent = clk_stm32_mux_set_parent,
+};
+
+static void clk_stm32_gate_endisable(struct clk_hw *hw, int enable)
+{
+ struct clk_stm32_gate *gate = to_clk_stm32_gate(hw);
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(gate->lock, flags);
+
+ stm32_gate_endisable(gate->base, gate->clock_data, gate->gate_id, enable);
+
+ spin_unlock_irqrestore(gate->lock, flags);
+}
+
+static int clk_stm32_gate_enable(struct clk_hw *hw)
+{
+ clk_stm32_gate_endisable(hw, 1);
+
+ return 0;
+}
+
+static void clk_stm32_gate_disable(struct clk_hw *hw)
+{
+ clk_stm32_gate_endisable(hw, 0);
+}
+
+static int clk_stm32_gate_is_enabled(struct clk_hw *hw)
+{
+ struct clk_stm32_gate *gate = to_clk_stm32_gate(hw);
+
+ return stm32_gate_is_enabled(gate->base, gate->clock_data, gate->gate_id);
+}
+
+const struct clk_ops clk_stm32_gate_ops = {
+ .enable = clk_stm32_gate_enable,
+ .disable = clk_stm32_gate_disable,
+ .is_enabled = clk_stm32_gate_is_enabled,
+};
+
+static int clk_stm32_divider_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_stm32_div *div = to_clk_stm32_divider(hw);
+ unsigned long flags = 0;
+ int ret;
+
+ if (div->div_id == NO_STM32_DIV)
+ return rate;
+
+ spin_lock_irqsave(div->lock, flags);
+
+ ret = stm32_divider_set_rate(div->base, div->clock_data, div->div_id, rate, parent_rate);
+
+ spin_unlock_irqrestore(div->lock, flags);
+
+ return ret;
+}
+
+static long clk_stm32_divider_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_stm32_div *div = to_clk_stm32_divider(hw);
+ const struct stm32_div_cfg *divider;
+
+ if (div->div_id == NO_STM32_DIV)
+ return rate;
+
+ divider = &div->clock_data->dividers[div->div_id];
+
+ /* if read only, just return current value */
+ if (divider->flags & CLK_DIVIDER_READ_ONLY) {
+ u32 val;
+
+ val = readl(div->base + divider->offset) >> divider->shift;
+ val &= clk_div_mask(divider->width);
+
+ return divider_ro_round_rate(hw, rate, prate, divider->table,
+ divider->width, divider->flags,
+ val);
+ }
+
+ return divider_round_rate_parent(hw, clk_hw_get_parent(hw),
+ rate, prate, divider->table,
+ divider->width, divider->flags);
+}
+
+static unsigned long clk_stm32_divider_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_stm32_div *div = to_clk_stm32_divider(hw);
+
+ if (div->div_id == NO_STM32_DIV)
+ return parent_rate;
+
+ return stm32_divider_get_rate(div->base, div->clock_data, div->div_id, parent_rate);
+}
+
+const struct clk_ops clk_stm32_divider_ops = {
+ .recalc_rate = clk_stm32_divider_recalc_rate,
+ .round_rate = clk_stm32_divider_round_rate,
+ .set_rate = clk_stm32_divider_set_rate,
+};
+
+static int clk_stm32_composite_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+ unsigned long flags = 0;
+ int ret;
+
+ if (composite->div_id == NO_STM32_DIV)
+ return rate;
+
+ spin_lock_irqsave(composite->lock, flags);
+
+ ret = stm32_divider_set_rate(composite->base, composite->clock_data,
+ composite->div_id, rate, parent_rate);
+
+ spin_unlock_irqrestore(composite->lock, flags);
+
+ return ret;
+}
+
+static unsigned long clk_stm32_composite_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+
+ if (composite->div_id == NO_STM32_DIV)
+ return parent_rate;
+
+ return stm32_divider_get_rate(composite->base, composite->clock_data,
+ composite->div_id, parent_rate);
+}
+
+static int clk_stm32_composite_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+ const struct stm32_div_cfg *divider;
+ long rate;
+
+ if (composite->div_id == NO_STM32_DIV)
+ return 0;
+
+ divider = &composite->clock_data->dividers[composite->div_id];
+
+ /* if read only, just return current value */
+ if (divider->flags & CLK_DIVIDER_READ_ONLY) {
+ u32 val;
+
+ val = readl(composite->base + divider->offset) >> divider->shift;
+ val &= clk_div_mask(divider->width);
+
+ rate = divider_ro_round_rate(hw, req->rate, &req->best_parent_rate,
+ divider->table, divider->width, divider->flags,
+ val);
+ if (rate < 0)
+ return rate;
+
+ req->rate = rate;
+ return 0;
+ }
+
+ rate = divider_round_rate_parent(hw, clk_hw_get_parent(hw),
+ req->rate, &req->best_parent_rate,
+ divider->table, divider->width, divider->flags);
+ if (rate < 0)
+ return rate;
+
+ req->rate = rate;
+ return 0;
+}
+
+static long clk_stm32_composite_round_rate(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_rate_request req = {};
+ int ret;
+
+ req.rate = rate;
+ req.best_parent_rate = *prate;
+
+ ret = clk_stm32_composite_determine_rate(hw, &req);
+ if (ret)
+ return ret;
+
+ *prate = req.best_parent_rate;
+
+ return req.rate;
+}
+
+static int clk_stm32_composite_get_parent(struct clk_hw *hw)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+
+ return stm32_mux_get_parent(composite->base, composite->clock_data, composite->mux_id);
+}
+
+static int clk_stm32_composite_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(composite->lock, flags);
+
+ stm32_mux_set_parent(composite->base, composite->clock_data, composite->mux_id, index);
+
+ spin_unlock_irqrestore(composite->lock, flags);
+
+ if (composite->clock_data->is_multi_mux) {
+ struct clk_hw *other_mux_hw = composite->clock_data->is_multi_mux(hw);
+
+ if (other_mux_hw) {
+ struct clk_hw *hwp = clk_hw_get_parent_by_index(hw, index);
+
+ clk_hw_reparent(other_mux_hw, hwp);
+ }
+ }
+
+ return 0;
+}
+
+static int clk_stm32_composite_is_enabled(struct clk_hw *hw)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+
+ if (composite->gate_id == NO_STM32_GATE)
+ return (__clk_get_enable_count(&hw->clk) > 0);
+
+ return stm32_gate_is_enabled(composite->base, composite->clock_data, composite->gate_id);
+}
+
+#define MUX_SAFE_POSITION 0
+
+static int clk_stm32_has_safe_mux(struct clk_hw *hw)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+ const struct stm32_mux_cfg *mux = &composite->clock_data->muxes[composite->mux_id];
+
+ return !!(mux->flags & MUX_SAFE);
+}
+
+static void clk_stm32_set_safe_position_mux(struct clk_hw *hw)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+
+ if (!clk_stm32_composite_is_enabled(hw)) {
+ unsigned long flags = 0;
+
+ if (composite->clock_data->is_multi_mux) {
+ struct clk_hw *other_mux_hw = NULL;
+
+ other_mux_hw = composite->clock_data->is_multi_mux(hw);
+
+ if (!other_mux_hw || clk_stm32_composite_is_enabled(other_mux_hw))
+ return;
+ }
+
+ spin_lock_irqsave(composite->lock, flags);
+
+ stm32_mux_set_parent(composite->base, composite->clock_data,
+ composite->mux_id, MUX_SAFE_POSITION);
+
+ spin_unlock_irqrestore(composite->lock, flags);
+ }
+}
+
+static void clk_stm32_safe_restore_position_mux(struct clk_hw *hw)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+ int sel = clk_hw_get_parent_index(hw);
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(composite->lock, flags);
+
+ stm32_mux_set_parent(composite->base, composite->clock_data, composite->mux_id, sel);
+
+ spin_unlock_irqrestore(composite->lock, flags);
+}
+
+static void clk_stm32_composite_gate_endisable(struct clk_hw *hw, int enable)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(composite->lock, flags);
+
+ stm32_gate_endisable(composite->base, composite->clock_data, composite->gate_id, enable);
+
+ spin_unlock_irqrestore(composite->lock, flags);
+}
+
+static int clk_stm32_composite_gate_enable(struct clk_hw *hw)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+
+ if (composite->gate_id == NO_STM32_GATE)
+ return 0;
+
+ clk_stm32_composite_gate_endisable(hw, 1);
+
+ if (composite->mux_id != NO_STM32_MUX && clk_stm32_has_safe_mux(hw))
+ clk_stm32_safe_restore_position_mux(hw);
+
+ return 0;
+}
+
+static void clk_stm32_composite_gate_disable(struct clk_hw *hw)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+
+ if (composite->gate_id == NO_STM32_GATE)
+ return;
+
+ clk_stm32_composite_gate_endisable(hw, 0);
+
+ if (composite->mux_id != NO_STM32_MUX && clk_stm32_has_safe_mux(hw))
+ clk_stm32_set_safe_position_mux(hw);
+}
+
+const struct clk_ops clk_stm32_composite_ops = {
+ .set_rate = clk_stm32_composite_set_rate,
+ .recalc_rate = clk_stm32_composite_recalc_rate,
+ .round_rate = clk_stm32_composite_round_rate,
+ .get_parent = clk_stm32_composite_get_parent,
+ .set_parent = clk_stm32_composite_set_parent,
+ .enable = clk_stm32_composite_gate_enable,
+ .disable = clk_stm32_composite_gate_disable,
+ .is_enabled = clk_stm32_composite_is_enabled,
+};
+
+struct clk_hw *clk_stm32_mux_register(struct device *dev,
+ const struct stm32_rcc_match_data *data,
+ void __iomem *base,
+ spinlock_t *lock,
+ const struct clock_config *cfg)
+{
+ struct clk_stm32_mux *mux = cfg->clock_cfg;
+ struct clk_hw *hw = &mux->hw;
+ int err;
+
+ mux->base = base;
+ mux->lock = lock;
+ mux->clock_data = data->clock_data;
+
+ err = clk_hw_register(dev, hw);
+ if (err)
+ return ERR_PTR(err);
+
+ return hw;
+}
+
+struct clk_hw *clk_stm32_gate_register(struct device *dev,
+ const struct stm32_rcc_match_data *data,
+ void __iomem *base,
+ spinlock_t *lock,
+ const struct clock_config *cfg)
+{
+ struct clk_stm32_gate *gate = cfg->clock_cfg;
+ struct clk_hw *hw = &gate->hw;
+ int err;
+
+ gate->base = base;
+ gate->lock = lock;
+ gate->clock_data = data->clock_data;
+
+ err = clk_hw_register(dev, hw);
+ if (err)
+ return ERR_PTR(err);
+
+ return hw;
+}
+
+struct clk_hw *clk_stm32_div_register(struct device *dev,
+ const struct stm32_rcc_match_data *data,
+ void __iomem *base,
+ spinlock_t *lock,
+ const struct clock_config *cfg)
+{
+ struct clk_stm32_div *div = cfg->clock_cfg;
+ struct clk_hw *hw = &div->hw;
+ int err;
+
+ div->base = base;
+ div->lock = lock;
+ div->clock_data = data->clock_data;
+
+ err = clk_hw_register(dev, hw);
+ if (err)
+ return ERR_PTR(err);
+
+ return hw;
+}
+
+struct clk_hw *clk_stm32_composite_register(struct device *dev,
+ const struct stm32_rcc_match_data *data,
+ void __iomem *base,
+ spinlock_t *lock,
+ const struct clock_config *cfg)
+{
+ struct clk_stm32_composite *composite = cfg->clock_cfg;
+ struct clk_hw *hw = &composite->hw;
+ int err;
+
+ composite->base = base;
+ composite->lock = lock;
+ composite->clock_data = data->clock_data;
+
+ err = clk_hw_register(dev, hw);
+ if (err)
+ return ERR_PTR(err);
+
+ return hw;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-11 16:38:02 +0000