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-rw-r--r--drivers/st/clk/clk-stm32-core.c1096
1 files changed, 1096 insertions, 0 deletions
diff --git a/drivers/st/clk/clk-stm32-core.c b/drivers/st/clk/clk-stm32-core.c
new file mode 100644
index 0000000..bb03125
--- /dev/null
+++ b/drivers/st/clk/clk-stm32-core.c
@@ -0,0 +1,1096 @@
+/*
+ * Copyright (C) 2022, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+
+#include "clk-stm32-core.h"
+#include <common/debug.h>
+#include <common/fdt_wrappers.h>
+#include <drivers/clk.h>
+#include <drivers/delay_timer.h>
+#include <drivers/st/stm32mp_clkfunc.h>
+#include <lib/mmio.h>
+#include <lib/spinlock.h>
+
+static struct spinlock reg_lock;
+static struct spinlock refcount_lock;
+
+static struct stm32_clk_priv *stm32_clock_data;
+
+const struct stm32_clk_ops clk_mux_ops;
+
+struct stm32_clk_priv *clk_stm32_get_priv(void)
+{
+ return stm32_clock_data;
+}
+
+static void stm32mp1_clk_lock(struct spinlock *lock)
+{
+ if (stm32mp_lock_available()) {
+ /* Assume interrupts are masked */
+ spin_lock(lock);
+ }
+}
+
+static void stm32mp1_clk_unlock(struct spinlock *lock)
+{
+ if (stm32mp_lock_available()) {
+ spin_unlock(lock);
+ }
+}
+
+void stm32mp1_clk_rcc_regs_lock(void)
+{
+ stm32mp1_clk_lock(&reg_lock);
+}
+
+void stm32mp1_clk_rcc_regs_unlock(void)
+{
+ stm32mp1_clk_unlock(&reg_lock);
+}
+
+#define TIMEOUT_US_1S U(1000000)
+#define OSCRDY_TIMEOUT TIMEOUT_US_1S
+
+struct clk_oscillator_data *clk_oscillator_get_data(struct stm32_clk_priv *priv, int id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ struct stm32_osc_cfg *osc_cfg = clk->clock_cfg;
+ int osc_id = osc_cfg->osc_id;
+
+ return &priv->osci_data[osc_id];
+}
+
+void clk_oscillator_set_bypass(struct stm32_clk_priv *priv, int id, bool digbyp, bool bypass)
+{
+ struct clk_oscillator_data *osc_data = clk_oscillator_get_data(priv, id);
+
+ struct stm32_clk_bypass *bypass_data = osc_data->bypass;
+ uintptr_t address;
+
+ if (bypass_data == NULL) {
+ return;
+ }
+
+ address = priv->base + bypass_data->offset;
+
+ if (digbyp) {
+ mmio_setbits_32(address, BIT(bypass_data->bit_digbyp));
+ }
+
+ if (bypass || digbyp) {
+ mmio_setbits_32(address, BIT(bypass_data->bit_byp));
+ }
+}
+
+void clk_oscillator_set_css(struct stm32_clk_priv *priv, int id, bool css)
+{
+ struct clk_oscillator_data *osc_data = clk_oscillator_get_data(priv, id);
+
+ struct stm32_clk_css *css_data = osc_data->css;
+ uintptr_t address;
+
+ if (css_data == NULL) {
+ return;
+ }
+
+ address = priv->base + css_data->offset;
+
+ if (css) {
+ mmio_setbits_32(address, BIT(css_data->bit_css));
+ }
+}
+
+void clk_oscillator_set_drive(struct stm32_clk_priv *priv, int id, uint8_t lsedrv)
+{
+ struct clk_oscillator_data *osc_data = clk_oscillator_get_data(priv, id);
+
+ struct stm32_clk_drive *drive_data = osc_data->drive;
+ uintptr_t address;
+ uint32_t mask;
+ uint32_t value;
+
+ if (drive_data == NULL) {
+ return;
+ }
+
+ address = priv->base + drive_data->offset;
+
+ mask = (BIT(drive_data->drv_width) - 1U) << drive_data->drv_shift;
+
+ /*
+ * Warning: not recommended to switch directly from "high drive"
+ * to "medium low drive", and vice-versa.
+ */
+ value = (mmio_read_32(address) & mask) >> drive_data->drv_shift;
+
+ while (value != lsedrv) {
+ if (value > lsedrv) {
+ value--;
+ } else {
+ value++;
+ }
+
+ mmio_clrsetbits_32(address, mask, value << drive_data->drv_shift);
+ }
+}
+
+int clk_oscillator_wait_ready(struct stm32_clk_priv *priv, int id, bool ready_on)
+{
+ struct clk_oscillator_data *osc_data = clk_oscillator_get_data(priv, id);
+
+ return _clk_stm32_gate_wait_ready(priv, osc_data->gate_rdy_id, ready_on);
+}
+
+int clk_oscillator_wait_ready_on(struct stm32_clk_priv *priv, int id)
+{
+ return clk_oscillator_wait_ready(priv, id, true);
+}
+
+int clk_oscillator_wait_ready_off(struct stm32_clk_priv *priv, int id)
+{
+ return clk_oscillator_wait_ready(priv, id, false);
+}
+
+static int clk_gate_enable(struct stm32_clk_priv *priv, int id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ struct clk_gate_cfg *cfg = clk->clock_cfg;
+
+ mmio_setbits_32(priv->base + cfg->offset, BIT(cfg->bit_idx));
+
+ return 0;
+}
+
+static void clk_gate_disable(struct stm32_clk_priv *priv, int id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ struct clk_gate_cfg *cfg = clk->clock_cfg;
+
+ mmio_clrbits_32(priv->base + cfg->offset, BIT(cfg->bit_idx));
+}
+
+static bool clk_gate_is_enabled(struct stm32_clk_priv *priv, int id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ struct clk_gate_cfg *cfg = clk->clock_cfg;
+
+ return ((mmio_read_32(priv->base + cfg->offset) & BIT(cfg->bit_idx)) != 0U);
+}
+
+const struct stm32_clk_ops clk_gate_ops = {
+ .enable = clk_gate_enable,
+ .disable = clk_gate_disable,
+ .is_enabled = clk_gate_is_enabled,
+};
+
+void _clk_stm32_gate_disable(struct stm32_clk_priv *priv, uint16_t gate_id)
+{
+ const struct gate_cfg *gate = &priv->gates[gate_id];
+ uintptr_t addr = priv->base + gate->offset;
+
+ if (gate->set_clr != 0U) {
+ mmio_write_32(addr + RCC_MP_ENCLRR_OFFSET, BIT(gate->bit_idx));
+ } else {
+ mmio_clrbits_32(addr, BIT(gate->bit_idx));
+ }
+}
+
+int _clk_stm32_gate_enable(struct stm32_clk_priv *priv, uint16_t gate_id)
+{
+ const struct gate_cfg *gate = &priv->gates[gate_id];
+ uintptr_t addr = priv->base + gate->offset;
+
+ if (gate->set_clr != 0U) {
+ mmio_write_32(addr, BIT(gate->bit_idx));
+
+ } else {
+ mmio_setbits_32(addr, BIT(gate->bit_idx));
+ }
+
+ return 0;
+}
+
+const struct clk_stm32 *_clk_get(struct stm32_clk_priv *priv, int id)
+{
+ if ((unsigned int)id < priv->num) {
+ return &priv->clks[id];
+ }
+
+ return NULL;
+}
+
+#define clk_div_mask(_width) GENMASK(((_width) - 1U), 0U)
+
+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,
+ uint8_t width)
+{
+ if ((flags & CLK_DIVIDER_ONE_BASED) != 0UL) {
+ return val;
+ }
+
+ if ((flags & CLK_DIVIDER_POWER_OF_TWO) != 0UL) {
+ return BIT(val);
+ }
+
+ if ((flags & CLK_DIVIDER_MAX_AT_ZERO) != 0UL) {
+ return (val != 0U) ? val : BIT(width);
+ }
+
+ if (table != NULL) {
+ return _get_table_div(table, val);
+ }
+
+ return val + 1U;
+}
+
+#define TIMEOUT_US_200MS U(200000)
+#define CLKSRC_TIMEOUT TIMEOUT_US_200MS
+
+int clk_mux_set_parent(struct stm32_clk_priv *priv, uint16_t pid, uint8_t sel)
+{
+ const struct parent_cfg *parents = &priv->parents[pid & MUX_PARENT_MASK];
+ const struct mux_cfg *mux = parents->mux;
+ uintptr_t address = priv->base + mux->offset;
+ uint32_t mask;
+ uint64_t timeout;
+
+ mask = MASK_WIDTH_SHIFT(mux->width, mux->shift);
+
+ mmio_clrsetbits_32(address, mask, (sel << mux->shift) & mask);
+
+ if (mux->bitrdy == MUX_NO_BIT_RDY) {
+ return 0;
+ }
+
+ timeout = timeout_init_us(CLKSRC_TIMEOUT);
+
+ mask = BIT(mux->bitrdy);
+
+ while ((mmio_read_32(address) & mask) == 0U) {
+ if (timeout_elapsed(timeout)) {
+ return -ETIMEDOUT;
+ }
+ }
+
+ return 0;
+}
+
+int _clk_stm32_set_parent(struct stm32_clk_priv *priv, int clk, int clkp)
+{
+ const struct parent_cfg *parents;
+ uint16_t pid;
+ uint8_t sel;
+ int old_parent;
+
+ pid = priv->clks[clk].parent;
+
+ if ((pid == CLK_IS_ROOT) || (pid < MUX_MAX_PARENTS)) {
+ return -EINVAL;
+ }
+
+ old_parent = _clk_stm32_get_parent(priv, clk);
+ if (old_parent < 0) {
+ return old_parent;
+ }
+ if (old_parent == clkp) {
+ return 0;
+ }
+
+ parents = &priv->parents[pid & MUX_PARENT_MASK];
+
+ for (sel = 0; sel < parents->num_parents; sel++) {
+ if (parents->id_parents[sel] == (uint16_t)clkp) {
+ bool clk_was_enabled = _clk_stm32_is_enabled(priv, clk);
+ int err = 0;
+
+ /* Enable the parents (for glitch free mux) */
+ _clk_stm32_enable(priv, clkp);
+ _clk_stm32_enable(priv, old_parent);
+
+ err = clk_mux_set_parent(priv, pid, sel);
+
+ _clk_stm32_disable(priv, old_parent);
+
+ if (clk_was_enabled) {
+ _clk_stm32_disable(priv, old_parent);
+ } else {
+ _clk_stm32_disable(priv, clkp);
+ }
+
+ return err;
+ }
+ }
+
+ return -EINVAL;
+}
+
+int clk_mux_get_parent(struct stm32_clk_priv *priv, uint32_t mux_id)
+{
+ const struct parent_cfg *parent;
+ const struct mux_cfg *mux;
+ uint32_t mask;
+
+ if (mux_id >= priv->nb_parents) {
+ panic();
+ }
+
+ parent = &priv->parents[mux_id];
+ mux = parent->mux;
+
+ mask = MASK_WIDTH_SHIFT(mux->width, mux->shift);
+
+ return (mmio_read_32(priv->base + mux->offset) & mask) >> mux->shift;
+}
+
+int _clk_stm32_set_parent_by_index(struct stm32_clk_priv *priv, int clk, int sel)
+{
+ uint16_t pid;
+
+ pid = priv->clks[clk].parent;
+
+ if ((pid == CLK_IS_ROOT) || (pid < MUX_MAX_PARENTS)) {
+ return -EINVAL;
+ }
+
+ return clk_mux_set_parent(priv, pid, sel);
+}
+
+int _clk_stm32_get_parent(struct stm32_clk_priv *priv, int clk_id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, clk_id);
+ const struct parent_cfg *parent;
+ uint16_t mux_id;
+ int sel;
+
+ mux_id = priv->clks[clk_id].parent;
+ if (mux_id == CLK_IS_ROOT) {
+ return CLK_IS_ROOT;
+ }
+
+ if (mux_id < MUX_MAX_PARENTS) {
+ return mux_id & MUX_PARENT_MASK;
+ }
+
+ mux_id &= MUX_PARENT_MASK;
+ parent = &priv->parents[mux_id];
+
+ if (clk->ops->get_parent != NULL) {
+ sel = clk->ops->get_parent(priv, clk_id);
+ } else {
+ sel = clk_mux_get_parent(priv, mux_id);
+ }
+
+ if ((sel >= 0) && (sel < parent->num_parents)) {
+ return parent->id_parents[sel];
+ }
+
+ return -EINVAL;
+}
+
+int _clk_stm32_get_parent_index(struct stm32_clk_priv *priv, int clk_id)
+{
+ uint16_t mux_id;
+
+ mux_id = priv->clks[clk_id].parent;
+ if (mux_id == CLK_IS_ROOT) {
+ return CLK_IS_ROOT;
+ }
+
+ if (mux_id < MUX_MAX_PARENTS) {
+ return mux_id & MUX_PARENT_MASK;
+ }
+
+ mux_id &= MUX_PARENT_MASK;
+
+ return clk_mux_get_parent(priv, mux_id);
+}
+
+int _clk_stm32_get_parent_by_index(struct stm32_clk_priv *priv, int clk_id, int idx)
+{
+ const struct parent_cfg *parent;
+ uint16_t mux_id;
+
+ mux_id = priv->clks[clk_id].parent;
+ if (mux_id == CLK_IS_ROOT) {
+ return CLK_IS_ROOT;
+ }
+
+ if (mux_id < MUX_MAX_PARENTS) {
+ return mux_id & MUX_PARENT_MASK;
+ }
+
+ mux_id &= MUX_PARENT_MASK;
+ parent = &priv->parents[mux_id];
+
+ if (idx < parent->num_parents) {
+ return parent->id_parents[idx];
+ }
+
+ return -EINVAL;
+}
+
+int clk_get_index(struct stm32_clk_priv *priv, unsigned long binding_id)
+{
+ unsigned int i;
+
+ for (i = 0U; i < priv->num; i++) {
+ if (binding_id == priv->clks[i].binding) {
+ return (int)i;
+ }
+ }
+
+ return -EINVAL;
+}
+
+unsigned long _clk_stm32_get_rate(struct stm32_clk_priv *priv, int id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ int parent;
+ unsigned long rate = 0UL;
+
+ if ((unsigned int)id >= priv->num) {
+ return rate;
+ }
+
+ parent = _clk_stm32_get_parent(priv, id);
+ if (parent < 0) {
+ return 0UL;
+ }
+
+ if (clk->ops->recalc_rate != NULL) {
+ unsigned long prate = 0UL;
+
+ if (parent != CLK_IS_ROOT) {
+ prate = _clk_stm32_get_rate(priv, parent);
+ }
+
+ rate = clk->ops->recalc_rate(priv, id, prate);
+
+ return rate;
+ }
+
+ switch (parent) {
+ case CLK_IS_ROOT:
+ panic();
+
+ default:
+ rate = _clk_stm32_get_rate(priv, parent);
+ break;
+ }
+ return rate;
+
+}
+
+unsigned long _clk_stm32_get_parent_rate(struct stm32_clk_priv *priv, int id)
+{
+ int parent_id = _clk_stm32_get_parent(priv, id);
+
+ if (parent_id < 0) {
+ return 0UL;
+ }
+
+ return _clk_stm32_get_rate(priv, parent_id);
+}
+
+static uint8_t _stm32_clk_get_flags(struct stm32_clk_priv *priv, int id)
+{
+ return priv->clks[id].flags;
+}
+
+bool _stm32_clk_is_flags(struct stm32_clk_priv *priv, int id, uint8_t flag)
+{
+ if (_stm32_clk_get_flags(priv, id) & flag) {
+ return true;
+ }
+
+ return false;
+}
+
+int clk_stm32_enable_call_ops(struct stm32_clk_priv *priv, uint16_t id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+
+ if (clk->ops->enable != NULL) {
+ clk->ops->enable(priv, id);
+ }
+
+ return 0;
+}
+
+static int _clk_stm32_enable_core(struct stm32_clk_priv *priv, int id)
+{
+ int parent;
+ int ret = 0;
+
+ if (priv->gate_refcounts[id] == 0U) {
+ parent = _clk_stm32_get_parent(priv, id);
+ if (parent < 0) {
+ return parent;
+ }
+ if (parent != CLK_IS_ROOT) {
+ ret = _clk_stm32_enable_core(priv, parent);
+ if (ret) {
+ return ret;
+ }
+ }
+ clk_stm32_enable_call_ops(priv, id);
+ }
+
+ priv->gate_refcounts[id]++;
+
+ if (priv->gate_refcounts[id] == UINT_MAX) {
+ ERROR("%s: %d max enable count !", __func__, id);
+ panic();
+ }
+
+ return 0;
+}
+
+int _clk_stm32_enable(struct stm32_clk_priv *priv, int id)
+{
+ int ret;
+
+ stm32mp1_clk_lock(&refcount_lock);
+ ret = _clk_stm32_enable_core(priv, id);
+ stm32mp1_clk_unlock(&refcount_lock);
+
+ return ret;
+}
+
+void clk_stm32_disable_call_ops(struct stm32_clk_priv *priv, uint16_t id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+
+ if (clk->ops->disable != NULL) {
+ clk->ops->disable(priv, id);
+ }
+}
+
+static void _clk_stm32_disable_core(struct stm32_clk_priv *priv, int id)
+{
+ int parent;
+
+ if ((priv->gate_refcounts[id] == 1U) && _stm32_clk_is_flags(priv, id, CLK_IS_CRITICAL)) {
+ return;
+ }
+
+ if (priv->gate_refcounts[id] == 0U) {
+ /* case of clock ignore unused */
+ if (_clk_stm32_is_enabled(priv, id)) {
+ clk_stm32_disable_call_ops(priv, id);
+ return;
+ }
+ VERBOSE("%s: %d already disabled !\n\n", __func__, id);
+ return;
+ }
+
+ if (--priv->gate_refcounts[id] > 0U) {
+ return;
+ }
+
+ clk_stm32_disable_call_ops(priv, id);
+
+ parent = _clk_stm32_get_parent(priv, id);
+ if ((parent >= 0) && (parent != CLK_IS_ROOT)) {
+ _clk_stm32_disable_core(priv, parent);
+ }
+}
+
+void _clk_stm32_disable(struct stm32_clk_priv *priv, int id)
+{
+ stm32mp1_clk_lock(&refcount_lock);
+
+ _clk_stm32_disable_core(priv, id);
+
+ stm32mp1_clk_unlock(&refcount_lock);
+}
+
+bool _clk_stm32_is_enabled(struct stm32_clk_priv *priv, int id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+
+ if (clk->ops->is_enabled != NULL) {
+ return clk->ops->is_enabled(priv, id);
+ }
+
+ return priv->gate_refcounts[id];
+}
+
+static int clk_stm32_enable(unsigned long binding_id)
+{
+ struct stm32_clk_priv *priv = clk_stm32_get_priv();
+ int id;
+
+ id = clk_get_index(priv, binding_id);
+ if (id == -EINVAL) {
+ return id;
+ }
+
+ return _clk_stm32_enable(priv, id);
+}
+
+static void clk_stm32_disable(unsigned long binding_id)
+{
+ struct stm32_clk_priv *priv = clk_stm32_get_priv();
+ int id;
+
+ id = clk_get_index(priv, binding_id);
+ if (id != -EINVAL) {
+ _clk_stm32_disable(priv, id);
+ }
+}
+
+static bool clk_stm32_is_enabled(unsigned long binding_id)
+{
+ struct stm32_clk_priv *priv = clk_stm32_get_priv();
+ int id;
+
+ id = clk_get_index(priv, binding_id);
+ if (id == -EINVAL) {
+ return false;
+ }
+
+ return _clk_stm32_is_enabled(priv, id);
+}
+
+static unsigned long clk_stm32_get_rate(unsigned long binding_id)
+{
+ struct stm32_clk_priv *priv = clk_stm32_get_priv();
+ int id;
+
+ id = clk_get_index(priv, binding_id);
+ if (id == -EINVAL) {
+ return 0UL;
+ }
+
+ return _clk_stm32_get_rate(priv, id);
+}
+
+static int clk_stm32_get_parent(unsigned long binding_id)
+{
+ struct stm32_clk_priv *priv = clk_stm32_get_priv();
+ int id;
+
+ id = clk_get_index(priv, binding_id);
+ if (id == -EINVAL) {
+ return id;
+ }
+
+ return _clk_stm32_get_parent(priv, id);
+}
+
+static const struct clk_ops stm32mp_clk_ops = {
+ .enable = clk_stm32_enable,
+ .disable = clk_stm32_disable,
+ .is_enabled = clk_stm32_is_enabled,
+ .get_rate = clk_stm32_get_rate,
+ .get_parent = clk_stm32_get_parent,
+};
+
+void clk_stm32_enable_critical_clocks(void)
+{
+ struct stm32_clk_priv *priv = clk_stm32_get_priv();
+ unsigned int i;
+
+ for (i = 0U; i < priv->num; i++) {
+ if (_stm32_clk_is_flags(priv, i, CLK_IS_CRITICAL)) {
+ _clk_stm32_enable(priv, i);
+ }
+ }
+}
+
+static void stm32_clk_register(void)
+{
+ clk_register(&stm32mp_clk_ops);
+}
+
+uint32_t clk_stm32_div_get_value(struct stm32_clk_priv *priv, int div_id)
+{
+ const struct div_cfg *divider = &priv->div[div_id];
+ uint32_t val = 0;
+
+ val = mmio_read_32(priv->base + divider->offset) >> divider->shift;
+ val &= clk_div_mask(divider->width);
+
+ return val;
+}
+
+unsigned long _clk_stm32_divider_recalc(struct stm32_clk_priv *priv,
+ int div_id,
+ unsigned long prate)
+{
+ const struct div_cfg *divider = &priv->div[div_id];
+ uint32_t val = clk_stm32_div_get_value(priv, div_id);
+ unsigned int div = 0U;
+
+ div = _get_div(divider->table, val, divider->flags, divider->width);
+ if (div == 0U) {
+ return prate;
+ }
+
+ return div_round_up((uint64_t)prate, div);
+}
+
+unsigned long clk_stm32_divider_recalc(struct stm32_clk_priv *priv, int id,
+ unsigned long prate)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ struct clk_stm32_div_cfg *div_cfg = clk->clock_cfg;
+
+ return _clk_stm32_divider_recalc(priv, div_cfg->id, prate);
+}
+
+const struct stm32_clk_ops clk_stm32_divider_ops = {
+ .recalc_rate = clk_stm32_divider_recalc,
+};
+
+int clk_stm32_set_div(struct stm32_clk_priv *priv, uint32_t div_id, uint32_t value)
+{
+ const struct div_cfg *divider;
+ uintptr_t address;
+ uint64_t timeout;
+ uint32_t mask;
+
+ if (div_id >= priv->nb_div) {
+ panic();
+ }
+
+ divider = &priv->div[div_id];
+ address = priv->base + divider->offset;
+
+ mask = MASK_WIDTH_SHIFT(divider->width, divider->shift);
+ mmio_clrsetbits_32(address, mask, (value << divider->shift) & mask);
+
+ if (divider->bitrdy == DIV_NO_BIT_RDY) {
+ return 0;
+ }
+
+ timeout = timeout_init_us(CLKSRC_TIMEOUT);
+ mask = BIT(divider->bitrdy);
+
+ while ((mmio_read_32(address) & mask) == 0U) {
+ if (timeout_elapsed(timeout)) {
+ return -ETIMEDOUT;
+ }
+ }
+
+ return 0;
+}
+
+int _clk_stm32_gate_wait_ready(struct stm32_clk_priv *priv, uint16_t gate_id,
+ bool ready_on)
+{
+ const struct gate_cfg *gate = &priv->gates[gate_id];
+ uintptr_t address = priv->base + gate->offset;
+ uint32_t mask_rdy = BIT(gate->bit_idx);
+ uint64_t timeout;
+ uint32_t mask_test;
+
+ if (ready_on) {
+ mask_test = BIT(gate->bit_idx);
+ } else {
+ mask_test = 0U;
+ }
+
+ timeout = timeout_init_us(OSCRDY_TIMEOUT);
+
+ while ((mmio_read_32(address) & mask_rdy) != mask_test) {
+ if (timeout_elapsed(timeout)) {
+ break;
+ }
+ }
+
+ if ((mmio_read_32(address) & mask_rdy) != mask_test) {
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+int clk_stm32_gate_enable(struct stm32_clk_priv *priv, int id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ struct clk_stm32_gate_cfg *cfg = clk->clock_cfg;
+ const struct gate_cfg *gate = &priv->gates[cfg->id];
+ uintptr_t addr = priv->base + gate->offset;
+
+ if (gate->set_clr != 0U) {
+ mmio_write_32(addr, BIT(gate->bit_idx));
+
+ } else {
+ mmio_setbits_32(addr, BIT(gate->bit_idx));
+ }
+
+ return 0;
+}
+
+void clk_stm32_gate_disable(struct stm32_clk_priv *priv, int id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ struct clk_stm32_gate_cfg *cfg = clk->clock_cfg;
+ const struct gate_cfg *gate = &priv->gates[cfg->id];
+ uintptr_t addr = priv->base + gate->offset;
+
+ if (gate->set_clr != 0U) {
+ mmio_write_32(addr + RCC_MP_ENCLRR_OFFSET, BIT(gate->bit_idx));
+ } else {
+ mmio_clrbits_32(addr, BIT(gate->bit_idx));
+ }
+}
+
+bool _clk_stm32_gate_is_enabled(struct stm32_clk_priv *priv, int gate_id)
+{
+ const struct gate_cfg *gate;
+ uint32_t addr;
+
+ gate = &priv->gates[gate_id];
+ addr = priv->base + gate->offset;
+
+ return ((mmio_read_32(addr) & BIT(gate->bit_idx)) != 0U);
+}
+
+bool clk_stm32_gate_is_enabled(struct stm32_clk_priv *priv, int id)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ struct clk_stm32_gate_cfg *cfg = clk->clock_cfg;
+
+ return _clk_stm32_gate_is_enabled(priv, cfg->id);
+}
+
+const struct stm32_clk_ops clk_stm32_gate_ops = {
+ .enable = clk_stm32_gate_enable,
+ .disable = clk_stm32_gate_disable,
+ .is_enabled = clk_stm32_gate_is_enabled,
+};
+
+const struct stm32_clk_ops clk_fixed_factor_ops = {
+ .recalc_rate = fixed_factor_recalc_rate,
+};
+
+unsigned long fixed_factor_recalc_rate(struct stm32_clk_priv *priv,
+ int id, unsigned long prate)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ const struct fixed_factor_cfg *cfg = clk->clock_cfg;
+ unsigned long long rate;
+
+ rate = (unsigned long long)prate * cfg->mult;
+
+ if (cfg->div == 0U) {
+ ERROR("division by zero\n");
+ panic();
+ }
+
+ return (unsigned long)(rate / cfg->div);
+};
+
+#define APB_DIV_MASK GENMASK(2, 0)
+#define TIM_PRE_MASK BIT(0)
+
+static unsigned long timer_recalc_rate(struct stm32_clk_priv *priv,
+ int id, unsigned long prate)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ const struct clk_timer_cfg *cfg = clk->clock_cfg;
+ uint32_t prescaler, timpre;
+ uintptr_t rcc_base = priv->base;
+
+ prescaler = mmio_read_32(rcc_base + cfg->apbdiv) &
+ APB_DIV_MASK;
+
+ timpre = mmio_read_32(rcc_base + cfg->timpre) &
+ TIM_PRE_MASK;
+
+ if (prescaler == 0U) {
+ return prate;
+ }
+
+ return prate * (timpre + 1U) * 2U;
+};
+
+const struct stm32_clk_ops clk_timer_ops = {
+ .recalc_rate = timer_recalc_rate,
+};
+
+static unsigned long clk_fixed_rate_recalc(struct stm32_clk_priv *priv, int id,
+ unsigned long prate)
+{
+ const struct clk_stm32 *clk = _clk_get(priv, id);
+ struct clk_stm32_fixed_rate_cfg *cfg = clk->clock_cfg;
+
+ return cfg->rate;
+}
+
+const struct stm32_clk_ops clk_stm32_fixed_rate_ops = {
+ .recalc_rate = clk_fixed_rate_recalc,
+};
+
+static unsigned long clk_stm32_osc_recalc_rate(struct stm32_clk_priv *priv,
+ int id, unsigned long prate)
+{
+ struct clk_oscillator_data *osc_data = clk_oscillator_get_data(priv, id);
+
+ return osc_data->frequency;
+};
+
+bool clk_stm32_osc_gate_is_enabled(struct stm32_clk_priv *priv, int id)
+{
+ struct clk_oscillator_data *osc_data = clk_oscillator_get_data(priv, id);
+
+ return _clk_stm32_gate_is_enabled(priv, osc_data->gate_id);
+
+}
+
+int clk_stm32_osc_gate_enable(struct stm32_clk_priv *priv, int id)
+{
+ struct clk_oscillator_data *osc_data = clk_oscillator_get_data(priv, id);
+
+ _clk_stm32_gate_enable(priv, osc_data->gate_id);
+
+ if (_clk_stm32_gate_wait_ready(priv, osc_data->gate_rdy_id, true) != 0U) {
+ ERROR("%s: %s (%d)\n", __func__, osc_data->name, __LINE__);
+ panic();
+ }
+
+ return 0;
+}
+
+void clk_stm32_osc_gate_disable(struct stm32_clk_priv *priv, int id)
+{
+ struct clk_oscillator_data *osc_data = clk_oscillator_get_data(priv, id);
+
+ _clk_stm32_gate_disable(priv, osc_data->gate_id);
+
+ if (_clk_stm32_gate_wait_ready(priv, osc_data->gate_rdy_id, false) != 0U) {
+ ERROR("%s: %s (%d)\n", __func__, osc_data->name, __LINE__);
+ panic();
+ }
+}
+
+static unsigned long clk_stm32_get_dt_oscillator_frequency(const char *name)
+{
+ void *fdt = NULL;
+ int node = 0;
+ int subnode = 0;
+
+ if (fdt_get_address(&fdt) == 0) {
+ panic();
+ }
+
+ node = fdt_path_offset(fdt, "/clocks");
+ if (node < 0) {
+ return 0UL;
+ }
+
+ fdt_for_each_subnode(subnode, fdt, node) {
+ const char *cchar = NULL;
+ const fdt32_t *cuint = NULL;
+ int ret = 0;
+
+ cchar = fdt_get_name(fdt, subnode, &ret);
+ if (cchar == NULL) {
+ continue;
+ }
+
+ if (strncmp(cchar, name, (size_t)ret) ||
+ fdt_get_status(subnode) == DT_DISABLED) {
+ continue;
+ }
+
+ cuint = fdt_getprop(fdt, subnode, "clock-frequency", &ret);
+ if (cuint == NULL) {
+ return 0UL;
+ }
+
+ return fdt32_to_cpu(*cuint);
+ }
+
+ return 0UL;
+}
+
+void clk_stm32_osc_init(struct stm32_clk_priv *priv, int id)
+{
+ struct clk_oscillator_data *osc_data = clk_oscillator_get_data(priv, id);
+ const char *name = osc_data->name;
+
+ osc_data->frequency = clk_stm32_get_dt_oscillator_frequency(name);
+}
+
+const struct stm32_clk_ops clk_stm32_osc_ops = {
+ .recalc_rate = clk_stm32_osc_recalc_rate,
+ .is_enabled = clk_stm32_osc_gate_is_enabled,
+ .enable = clk_stm32_osc_gate_enable,
+ .disable = clk_stm32_osc_gate_disable,
+ .init = clk_stm32_osc_init,
+};
+
+const struct stm32_clk_ops clk_stm32_osc_nogate_ops = {
+ .recalc_rate = clk_stm32_osc_recalc_rate,
+ .init = clk_stm32_osc_init,
+};
+
+int stm32_clk_parse_fdt_by_name(void *fdt, int node, const char *name, uint32_t *tab, uint32_t *nb)
+{
+ const fdt32_t *cell;
+ int len = 0;
+ uint32_t i;
+
+ cell = fdt_getprop(fdt, node, name, &len);
+ if (cell == NULL) {
+ *nb = 0U;
+ return 0;
+ }
+
+ for (i = 0; i < ((uint32_t)len / sizeof(uint32_t)); i++) {
+ uint32_t val = fdt32_to_cpu(cell[i]);
+
+ tab[i] = val;
+ }
+
+ *nb = (uint32_t)len / sizeof(uint32_t);
+
+ return 0;
+}
+
+int clk_stm32_init(struct stm32_clk_priv *priv, uintptr_t base)
+{
+ unsigned int i;
+
+ stm32_clock_data = priv;
+
+ priv->base = base;
+
+ for (i = 0U; i < priv->num; i++) {
+ const struct clk_stm32 *clk = _clk_get(priv, i);
+
+ assert(clk->ops != NULL);
+
+ if (clk->ops->init != NULL) {
+ clk->ops->init(priv, i);
+ }
+ }
+
+ stm32_clk_register();
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-12 10:05:14 +0000