include/linux/sh_clk.h

Source file repositories/reference/linux-study-clean/include/linux/sh_clk.h

File Facts

System
Linux kernel
Corpus path
include/linux/sh_clk.h
Extension
.h
Size
6098 bytes
Lines
214
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct clk_mapping {
	phys_addr_t		phys;
	void __iomem		*base;
	unsigned long		len;
	struct kref		ref;
};

struct sh_clk_ops {
#ifdef CONFIG_SH_CLK_CPG_LEGACY
	void (*init)(struct clk *clk);
#endif
	int (*enable)(struct clk *clk);
	void (*disable)(struct clk *clk);
	unsigned long (*recalc)(struct clk *clk);
	int (*set_rate)(struct clk *clk, unsigned long rate);
	int (*set_parent)(struct clk *clk, struct clk *parent);
	long (*round_rate)(struct clk *clk, unsigned long rate);
};

#define SH_CLK_DIV_MSK(div)	((1 << (div)) - 1)
#define SH_CLK_DIV4_MSK		SH_CLK_DIV_MSK(4)
#define SH_CLK_DIV6_MSK		SH_CLK_DIV_MSK(6)

struct clk {
	struct list_head	node;
	struct clk		*parent;
	struct clk		**parent_table;	/* list of parents to */
	unsigned short		parent_num;	/* choose between */
	unsigned char		src_shift;	/* source clock field in the */
	unsigned char		src_width;	/* configuration register */
	struct sh_clk_ops	*ops;

	struct list_head	children;
	struct list_head	sibling;	/* node for children */

	int			usecount;

	unsigned long		rate;
	unsigned long		flags;

	void __iomem		*enable_reg;
	void __iomem		*status_reg;
	unsigned int		enable_bit;
	void __iomem		*mapped_reg;

	unsigned int		div_mask;
	unsigned long		arch_flags;
	void			*priv;
	struct clk_mapping	*mapping;
	struct cpufreq_frequency_table *freq_table;
	unsigned int		nr_freqs;
};

#define CLK_ENABLE_ON_INIT	BIT(0)

#define CLK_ENABLE_REG_32BIT	BIT(1)	/* default access size */
#define CLK_ENABLE_REG_16BIT	BIT(2)
#define CLK_ENABLE_REG_8BIT	BIT(3)

#define CLK_MASK_DIV_ON_DISABLE	BIT(4)

#define CLK_ENABLE_REG_MASK	(CLK_ENABLE_REG_32BIT | \
				 CLK_ENABLE_REG_16BIT | \
				 CLK_ENABLE_REG_8BIT)

/* drivers/sh/clk.c */
unsigned long followparent_recalc(struct clk *);
void recalculate_root_clocks(void);
void propagate_rate(struct clk *);
int clk_reparent(struct clk *child, struct clk *parent);
int clk_register(struct clk *);
void clk_unregister(struct clk *);
void clk_enable_init_clocks(void);

struct clk_div_mult_table {
	unsigned int *divisors;
	unsigned int nr_divisors;
	unsigned int *multipliers;
	unsigned int nr_multipliers;
};

struct cpufreq_frequency_table;
void clk_rate_table_build(struct clk *clk,
			  struct cpufreq_frequency_table *freq_table,
			  int nr_freqs,
			  struct clk_div_mult_table *src_table,
			  unsigned long *bitmap);

long clk_rate_table_round(struct clk *clk,
			  struct cpufreq_frequency_table *freq_table,

Annotation

Implementation Notes