drivers/bus/vexpress-config.c

Source file repositories/reference/linux-study-clean/drivers/bus/vexpress-config.c

File Facts

System
Linux kernel
Corpus path
drivers/bus/vexpress-config.c
Extension
.c
Size
10196 bytes
Lines
419
Domain
Driver Families
Bucket
drivers/bus
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct vexpress_syscfg {
	struct device *dev;
	void __iomem *base;
	struct list_head funcs;
};

struct vexpress_syscfg_func {
	struct list_head list;
	struct vexpress_syscfg *syscfg;
	struct regmap *regmap;
	int num_templates;
	u32 template[] __counted_by(num_templates); /* Keep it last! */
};

struct vexpress_config_bridge_ops {
	struct regmap * (*regmap_init)(struct device *dev, void *context);
	void (*regmap_exit)(struct regmap *regmap, void *context);
};

struct vexpress_config_bridge {
	struct vexpress_config_bridge_ops *ops;
	void *context;
};


static DEFINE_MUTEX(vexpress_config_mutex);
static u32 vexpress_config_site_master = VEXPRESS_SITE_MASTER;


static void vexpress_config_set_master(u32 site)
{
	vexpress_config_site_master = site;
}

static void vexpress_config_lock(void *arg)
{
	mutex_lock(&vexpress_config_mutex);
}

static void vexpress_config_unlock(void *arg)
{
	mutex_unlock(&vexpress_config_mutex);
}


static void vexpress_config_find_prop(struct device_node *node,
		const char *name, u32 *val)
{
	/* Default value */
	*val = 0;

	of_node_get(node);
	while (node) {
		if (of_property_read_u32(node, name, val) == 0) {
			of_node_put(node);
			return;
		}
		node = of_get_next_parent(node);
	}
}

static int vexpress_config_get_topo(struct device_node *node, u32 *site,
		u32 *position, u32 *dcc)
{
	vexpress_config_find_prop(node, "arm,vexpress,site", site);
	if (*site == VEXPRESS_SITE_MASTER)
		*site = vexpress_config_site_master;
	if (WARN_ON(vexpress_config_site_master == VEXPRESS_SITE_MASTER))
		return -EINVAL;
	vexpress_config_find_prop(node, "arm,vexpress,position", position);
	vexpress_config_find_prop(node, "arm,vexpress,dcc", dcc);

	return 0;
}


static void vexpress_config_devres_release(struct device *dev, void *res)
{
	struct vexpress_config_bridge *bridge = dev_get_drvdata(dev->parent);
	struct regmap *regmap = res;

	bridge->ops->regmap_exit(regmap, bridge->context);
}

struct regmap *devm_regmap_init_vexpress_config(struct device *dev)
{
	struct vexpress_config_bridge *bridge;
	struct regmap *regmap;
	struct regmap **res;

Annotation

Implementation Notes