arch/mips/include/asm/mips-cps.h

Source file repositories/reference/linux-study-clean/arch/mips/include/asm/mips-cps.h

File Facts

System
Linux kernel
Corpus path
arch/mips/include/asm/mips-cps.h
Extension
.h
Size
7915 bytes
Lines
273
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (mips_cm_is64) {					\
			__raw_writeq(val, addr_##unit##_##name());	\
			break;						\
		}							\
									\
		__raw_writel((uint64_t)val >> 32,			\
			     addr_##unit##_##name() + 4);		\
		__raw_writel(val, addr_##unit##_##name());		\
		break;							\
									\
	default:							\
		__cps_access_bad_size();				\
		break;							\
	}								\
}

#define CPS_ACCESSOR_M(unit, sz, name)					\
static inline void change_##unit##_##name(uint##sz##_t mask,		\
					  uint##sz##_t val)		\
{									\
	uint##sz##_t reg_val = read_##unit##_##name();			\
	reg_val &= ~mask;						\
	reg_val |= val;							\
	write_##unit##_##name(reg_val);					\
}									\
									\
static inline void set_##unit##_##name(uint##sz##_t val)		\
{									\
	change_##unit##_##name(val, val);				\
}									\
									\
static inline void clear_##unit##_##name(uint##sz##_t val)		\
{									\
	change_##unit##_##name(val, 0);					\
}

#define CPS_ACCESSOR_RO(unit, sz, off, name)				\
	CPS_ACCESSOR_A(unit, off, name)					\
	CPS_ACCESSOR_R(unit, sz, name)

#define CPS_ACCESSOR_WO(unit, sz, off, name)				\
	CPS_ACCESSOR_A(unit, off, name)					\
	CPS_ACCESSOR_W(unit, sz, name)

#define CPS_ACCESSOR_RW(unit, sz, off, name)				\
	CPS_ACCESSOR_A(unit, off, name)					\
	CPS_ACCESSOR_R(unit, sz, name)					\
	CPS_ACCESSOR_W(unit, sz, name)					\
	CPS_ACCESSOR_M(unit, sz, name)

#include <asm/mips-cm.h>
#include <asm/mips-cpc.h>
#include <asm/mips-gic.h>

/**
 * mips_cps_numclusters - return the number of clusters present in the system
 *
 * Returns the number of clusters in the system.
 */
static inline unsigned int mips_cps_numclusters(void)
{
	if (mips_cm_revision() < CM_REV_CM3_5)
		return 1;

	return FIELD_GET(CM_GCR_CONFIG_NUM_CLUSTERS, read_gcr_config());
}

/**
 * mips_cps_cluster_config - return (GCR|CPC)_CONFIG from a cluster
 * @cluster: the ID of the cluster whose config we want
 *
 * Read the value of GCR_CONFIG (or its CPC_CONFIG mirror) from a @cluster.
 *
 * Returns the value of GCR_CONFIG.
 */
static inline uint64_t mips_cps_cluster_config(unsigned int cluster)
{
	uint64_t config;

	if (mips_cm_revision() < CM_REV_CM3_5) {
		/*
		 * Prior to CM 3.5 we don't have the notion of multiple
		 * clusters so we can trivially read the GCR_CONFIG register
		 * within this cluster.
		 */
		WARN_ON(cluster != 0);
		config = read_gcr_config();
	} else {
		/*
		 * From CM 3.5 onwards we read the CPC_CONFIG mirror of

Annotation

Implementation Notes