[PATCH v4 06/14] clk: stm32mp13: add composite clock

gabriel.fernandez
2022-05-16T07:07:34Z

Just to introduce management of stm32 composite clock.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
---
drivers/clk/stm32/clk-stm32-core.c | 174 +++++++++++++++++++++++++++++
drivers/clk/stm32/clk-stm32-core.h | 23 ++++
drivers/clk/stm32/clk-stm32mp13.c | 28 +++++
3 files changed, 225 insertions(+)

diff --git a/drivers/clk/stm32/clk-stm32-core.c b/drivers/clk/stm32/clk-stm32-core.c
index da38eca2b8c5..69e40c152d2f 100644
--- a/drivers/clk/stm32/clk-stm32-core.c
+++ b/drivers/clk/stm32/clk-stm32-core.c
@@ -389,6 +389,159 @@ const struct clk_ops clk_stm32_divider_ops = {
.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 long clk_stm32_composite_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+
+ const struct stm32_div_cfg *divider;
+
+ if (composite->div_id == NO_STM32_DIV)
+ return rate;
+
+ 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);
+
+ 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 u8 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);
+
+ 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);
+}
+
+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);
+
+ 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);
+}
+
+static void clk_stm32_composite_disable_unused(struct clk_hw *hw)
+{
+ struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+ unsigned long flags = 0;
+
+ if (composite->gate_id == NO_STM32_GATE)
+ return;
+
+ spin_lock_irqsave(composite->lock, flags);
+
+ stm32_gate_disable_unused(composite->base, composite->clock_data, composite->gate_id);
+
+ spin_unlock_irqrestore(composite->lock, flags);
+}
+
+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,
+ .disable_unused = clk_stm32_composite_disable_unused,
+};
+
struct clk_hw *clk_stm32_mux_register(struct device *dev,
const struct stm32_rcc_match_data *data,
void __iomem *base,
@@ -451,3 +604,24 @@ struct clk_hw *clk_stm32_div_register(struct device *dev,

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;
+}
diff --git a/drivers/clk/stm32/clk-stm32-core.h b/drivers/clk/stm32/clk-stm32-core.h
index c2de58a22aa8..6c5c8c08ecbf 100644
--- a/drivers/clk/stm32/clk-stm32-core.h
+++ b/drivers/clk/stm32/clk-stm32-core.h
@@ -114,10 +114,23 @@ struct clk_stm32_div {

#define to_clk_stm32_divider(_hw) container_of(_hw, struct clk_stm32_div, hw)

+struct clk_stm32_composite {
+ u16 gate_id;
+ u16 mux_id;
+ u16 div_id;
+ struct clk_hw hw;
+ void __iomem *base;
+ struct clk_stm32_clock_data *clock_data;
+ spinlock_t *lock; /* spin lock */
+};
+
+#define to_clk_stm32_composite(_hw) container_of(_hw, struct clk_stm32_composite, hw)
+
/* Clock operators */
extern const struct clk_ops clk_stm32_mux_ops;
extern const struct clk_ops clk_stm32_gate_ops;
extern const struct clk_ops clk_stm32_divider_ops;
+extern const struct clk_ops clk_stm32_composite_ops;

/* Clock registering */
struct clk_hw *clk_stm32_mux_register(struct device *dev,
@@ -138,6 +151,12 @@ struct clk_hw *clk_stm32_div_register(struct device *dev,
spinlock_t *lock,
const struct clock_config *cfg);

+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);
+
#define STM32_CLOCK_CFG(_binding, _clk, _struct, _register)\
{\
.id = (_binding),\
@@ -156,3 +175,7 @@ struct clk_hw *clk_stm32_div_register(struct device *dev,
#define STM32_DIV_CFG(_binding, _clk)\
STM32_CLOCK_CFG(_binding, &(_clk), struct clk_stm32_div *,\
&clk_stm32_div_register)
+
+#define STM32_COMPOSITE_CFG(_binding, _clk)\
+ STM32_CLOCK_CFG(_binding, &(_clk), struct clk_stm32_composite *,\
+ &clk_stm32_composite_register)
diff --git a/drivers/clk/stm32/clk-stm32mp13.c b/drivers/clk/stm32/clk-stm32mp13.c
index d93d92b5fe82..af9518a0d262 100644
--- a/drivers/clk/stm32/clk-stm32mp13.c
+++ b/drivers/clk/stm32/clk-stm32mp13.c
@@ -404,6 +404,14 @@ static const char * const eth12_src[] = {
"pll4_p", "pll3_q"
};

+static const char * const mco1_src[] = {
+ "ck_hsi", "ck_hse", "ck_csi", "ck_lsi", "ck_lse"
+};
+
+static const char * const mco2_src[] = {
+ "ck_mpu", "ck_axi", "ck_mlahb", "pll4_p", "ck_hse", "ck_hsi"
+};
+
static struct clk_stm32_mux ck_ker_eth1 = {
.mux_id = MUX_ETH1,
.hw.init = CLK_HW_INIT_PARENTS("ck_ker_eth1", eth12_src, &clk_stm32_mux_ops,
@@ -421,10 +429,30 @@ static struct clk_stm32_div eth1ptp_k = {
CLK_SET_RATE_NO_REPARENT),
};

+static struct clk_stm32_composite ck_mco1 = {
+ .gate_id = GATE_MCO1,
+ .mux_id = MUX_MCO1,
+ .div_id = DIV_MCO1,
+ .hw.init = CLK_HW_INIT_PARENTS("ck_mco1", mco1_src, &clk_stm32_composite_ops,
+ CLK_OPS_PARENT_ENABLE | CLK_SET_RATE_NO_REPARENT |
+ CLK_IGNORE_UNUSED),
+};
+
+static struct clk_stm32_composite ck_mco2 = {
+ .gate_id = GATE_MCO2,
+ .mux_id = MUX_MCO2,
+ .div_id = DIV_MCO2,
+ .hw.init = CLK_HW_INIT_PARENTS("ck_mco2", mco2_src, &clk_stm32_composite_ops,
+ CLK_OPS_PARENT_ENABLE | CLK_SET_RATE_NO_REPARENT |
+ CLK_IGNORE_UNUSED),
+};
+
static const struct clock_config stm32mp13_clock_cfg[] = {
STM32_MUX_CFG(NO_ID, ck_ker_eth1),
STM32_GATE_CFG(ETH1CK_K, eth1ck_k),
STM32_DIV_CFG(ETH1PTP_K, eth1ptp_k),
+ STM32_COMPOSITE_CFG(CK_MCO1, ck_mco1),
+ STM32_COMPOSITE_CFG(CK_MCO2, ck_mco2),
};

static u16 stm32mp13_cpt_gate[GATE_NB];
--
2.25.1