Commit fd7a1c90 authored by Gabriel Fernandez's avatar Gabriel Fernandez Committed by Stephen Boyd
Browse files

clk: stm32: introduce clocks for STM32MP257 platform 



This driver is intended for the STM32MP25 clock family and utilizes
the stm32-core API, similar to the stm32mp13 clock driver.

Signed-off-by: default avatarGabriel Fernandez <gabriel.fernandez@foss.st.com>
Link: https://lore.kernel.org/r/20240411092453.243633-4-gabriel.fernandez@foss.st.com


Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent df5df125

drivers/clk/stm32/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -25,5 +25,12 @@ config COMMON_CLK_STM32MP157 
	help

	  Support for stm32mp15x SoC family clocks.



config COMMON_CLK_STM32MP257

	bool "Clock driver for stm32mp25x clocks"

	depends on ARM64 || COMPILE_TEST

	default y

	help

	  Support for stm32mp25x SoC family clocks.



endif

drivers/clk/stm32/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_COMMON_CLK_STM32MP135)	+= clk-stm32mp13.o clk-stm32-core.o reset-stm32.o

obj-$(CONFIG_COMMON_CLK_STM32MP157)	+= clk-stm32mp1.o reset-stm32.o

obj-$(CONFIG_COMMON_CLK_STM32MP257)	+= clk-stm32mp25.o clk-stm32-core.o reset-stm32.o

drivers/clk/stm32/clk-stm32mp25.c

0 → 100644
+1875 −0

File added.

Preview size limit exceeded, changes collapsed.

drivers/clk/stm32/reset-stm32.c

+44 −15
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ struct stm32_reset_data { 
	struct reset_controller_dev	rcdev;

	void __iomem			*membase;

	u32				clear_offset;

	const struct stm32_reset_cfg	**reset_lines;

};



static inline struct stm32_reset_data *
@@ -27,22 +28,46 @@ to_stm32_reset_data(struct reset_controller_dev *rcdev) 
	return container_of(rcdev, struct stm32_reset_data, rcdev);

}



static int stm32_reset_update(struct reset_controller_dev *rcdev,

			      unsigned long id, bool assert)

static const struct stm32_reset_cfg *stm32_get_reset_line(struct reset_controller_dev *rcdev,

							  unsigned long id,

							  struct stm32_reset_cfg *line)

{

	struct stm32_reset_data *data = to_stm32_reset_data(rcdev);



	if (!data->reset_lines) {

		int reg_width = sizeof(u32);

		int bank = id / (reg_width * BITS_PER_BYTE);

		int offset = id % (reg_width * BITS_PER_BYTE);



	if (data->clear_offset) {

		line->offset = bank * reg_width;

		line->bit_idx = offset;

		line->set_clr = (data->clear_offset ? true : false);



		return line;

	}



	return data->reset_lines[id];

}



static int stm32_reset_update(struct reset_controller_dev *rcdev,

			      unsigned long id, bool assert)

{

	struct stm32_reset_data *data = to_stm32_reset_data(rcdev);

	struct stm32_reset_cfg line_reset;

	const struct stm32_reset_cfg *ptr_line;



	ptr_line = stm32_get_reset_line(rcdev, id, &line_reset);

	if (!ptr_line)

		return -EPERM;



	if (ptr_line->set_clr) {

		void __iomem *addr;



		addr = data->membase + (bank * reg_width);

		addr = data->membase + ptr_line->offset;

		if (!assert)

			addr += data->clear_offset;



		writel(BIT(offset), addr);

		writel(BIT(ptr_line->bit_idx), addr);



	} else {

		unsigned long flags;
@@ -50,14 +75,14 @@ static int stm32_reset_update(struct reset_controller_dev *rcdev, 


		spin_lock_irqsave(&data->lock, flags);



		reg = readl(data->membase + (bank * reg_width));

		reg = readl(data->membase + ptr_line->offset);



		if (assert)

			reg |= BIT(offset);

			reg |= BIT(ptr_line->bit_idx);

		else

			reg &= ~BIT(offset);

			reg &= ~BIT(ptr_line->bit_idx);



		writel(reg, data->membase + (bank * reg_width));

		writel(reg, data->membase + ptr_line->offset);



		spin_unlock_irqrestore(&data->lock, flags);

	}
@@ -81,14 +106,17 @@ static int stm32_reset_status(struct reset_controller_dev *rcdev, 
			      unsigned long id)

{

	struct stm32_reset_data *data = to_stm32_reset_data(rcdev);

	int reg_width = sizeof(u32);

	int bank = id / (reg_width * BITS_PER_BYTE);

	int offset = id % (reg_width * BITS_PER_BYTE);

	struct stm32_reset_cfg line_reset;

	const struct stm32_reset_cfg *ptr_line;

	u32 reg;



	reg = readl(data->membase + (bank * reg_width));

	ptr_line = stm32_get_reset_line(rcdev, id, &line_reset);

	if (!ptr_line)

		return -EPERM;



	reg = readl(data->membase + ptr_line->offset);



	return !!(reg & BIT(offset));

	return !!(reg & BIT(ptr_line->bit_idx));

}



static const struct reset_control_ops stm32_reset_ops = {
@@ -113,6 +141,7 @@ int stm32_rcc_reset_init(struct device *dev, struct clk_stm32_reset_data *data, 
	reset_data->rcdev.ops = &stm32_reset_ops;

	reset_data->rcdev.of_node = dev_of_node(dev);

	reset_data->rcdev.nr_resets = data->nr_lines;

	reset_data->reset_lines = data->reset_lines;

	reset_data->clear_offset = data->clear_offset;



	return reset_controller_register(&reset_data->rcdev);

drivers/clk/stm32/reset-stm32.h

+7 −0
Original line number Diff line number Diff line
@@ -4,8 +4,15 @@ 
 * Author: Gabriel Fernandez <gabriel.fernandez@foss.st.com> for STMicroelectronics.

 */



struct stm32_reset_cfg {

	u16 offset;

	u8 bit_idx;

	bool set_clr;

};



struct clk_stm32_reset_data {

	const struct reset_control_ops *ops;

	const struct stm32_reset_cfg **reset_lines;

	unsigned int nr_lines;

	u32 clear_offset;

};