From f95cea8308de5ef4075ae4f1f8a72ec275b0d5b5 Mon Sep 17 00:00:00 2001 From: Gabriel Fernandez Date: Mon, 16 May 2022 09:05:49 +0200 Subject: clk: stm32mp13: add stm32_mux clock management Just to introduce management of a stm32 mux clock. Signed-off-by: Gabriel Fernandez Link: https://lore.kernel.org/r/20220516070600.7692-4-gabriel.fernandez@foss.st.com Signed-off-by: Stephen Boyd --- drivers/clk/stm32/clk-stm32-core.c | 79 ++++++++++++++++++++++++++++++++++++++ drivers/clk/stm32/clk-stm32-core.h | 24 ++++++++++++ drivers/clk/stm32/clk-stm32mp13.c | 11 ++++++ 3 files changed, 114 insertions(+) (limited to 'drivers/clk/stm32') diff --git a/drivers/clk/stm32/clk-stm32-core.c b/drivers/clk/stm32/clk-stm32-core.c index 0fab4a5a8c66..98699093eb21 100644 --- a/drivers/clk/stm32/clk-stm32-core.c +++ b/drivers/clk/stm32/clk-stm32-core.c @@ -91,3 +91,82 @@ int stm32_rcc_init(struct device *dev, const struct of_device_id *match_data, 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 u8 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 = { + .get_parent = clk_stm32_mux_get_parent, + .set_parent = clk_stm32_mux_set_parent, +}; + +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; +} diff --git a/drivers/clk/stm32/clk-stm32-core.h b/drivers/clk/stm32/clk-stm32-core.h index 519723ae97eb..8563e6e1c91a 100644 --- a/drivers/clk/stm32/clk-stm32-core.h +++ b/drivers/clk/stm32/clk-stm32-core.h @@ -83,10 +83,34 @@ int stm32_rcc_init(struct device *dev, const struct of_device_id *match_data, /* DIV define */ #define DIV_NO_RDY 0xFF +/* Definition of clock structure */ +struct clk_stm32_mux { + u16 mux_id; + struct clk_hw hw; + void __iomem *base; + struct clk_stm32_clock_data *clock_data; + spinlock_t *lock; /* spin lock */ +}; + +#define to_clk_stm32_mux(_hw) container_of(_hw, struct clk_stm32_mux, hw) + +/* Clock operators */ +extern const struct clk_ops clk_stm32_mux_ops; + /* Clock registering */ +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); + #define STM32_CLOCK_CFG(_binding, _clk, _struct, _register)\ {\ .id = (_binding),\ .clock_cfg = (_struct) {_clk},\ .func = (_register),\ } + +#define STM32_MUX_CFG(_binding, _clk)\ + STM32_CLOCK_CFG(_binding, &(_clk), struct clk_stm32_mux *,\ + &clk_stm32_mux_register) diff --git a/drivers/clk/stm32/clk-stm32mp13.c b/drivers/clk/stm32/clk-stm32mp13.c index a2a6bbb4ace5..40568a676111 100644 --- a/drivers/clk/stm32/clk-stm32mp13.c +++ b/drivers/clk/stm32/clk-stm32mp13.c @@ -400,7 +400,18 @@ static const struct stm32_mux_cfg stm32mp13_muxes[] = { CFG_MUX(MUX_SDMMC2, RCC_SDMMC12CKSELR, 3, 3), }; +static const char * const eth12_src[] = { + "pll4_p", "pll3_q" +}; + +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, + CLK_OPS_PARENT_ENABLE | CLK_SET_RATE_NO_REPARENT), +}; + static const struct clock_config stm32mp13_clock_cfg[] = { + STM32_MUX_CFG(NO_ID, ck_ker_eth1), }; static u16 stm32mp13_cpt_gate[GATE_NB]; -- cgit v1.2.3