xref: /kvm-unit-tests/lib/arm/asm/gic-v3.h (revision 91a6c3cead72494724d563c19c6aebd2efd14d4e)

/*
 * All GIC* defines are lifted from include/linux/irqchip/arm-gic-v3.h
 *
 * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com>
 *
 * This work is licensed under the terms of the GNU LGPL, version 2.
 */
#ifndef _ASMARM_GIC_V3_H_
#define _ASMARM_GIC_V3_H_

#ifndef _ASMARM_GIC_H_
#error Do not directly include <asm/gic-v3.h>. Include <asm/gic.h>
#endif

/*
 * Distributor registers
 *
 * We expect to be run in Non-secure mode, thus we define the
 * group1 enable bits with respect to that view.
 */
#define GICD_CTLR_RWP			(1U << 31)
#define GICD_CTLR_ARE_NS		(1U << 4)
#define GICD_CTLR_ENABLE_G1A		(1U << 1)
#define GICD_CTLR_ENABLE_G1		(1U << 0)

/* Re-Distributor registers, offsets from RD_base */
#define GICR_TYPER			0x0008

#define GICR_TYPER_LAST			(1U << 4)

/* Re-Distributor registers, offsets from SGI_base */
#define GICR_IGROUPR0			GICD_IGROUPR
#define GICR_ISENABLER0			GICD_ISENABLER
#define GICR_IPRIORITYR0		GICD_IPRIORITYR

#include <asm/arch_gicv3.h>

#ifndef __ASSEMBLY__
#include <asm/setup.h>
#include <asm/processor.h>
#include <asm/delay.h>
#include <asm/smp.h>
#include <asm/io.h>

struct gicv3_data {
	void *dist_base;
	void *redist_base[NR_CPUS];
	unsigned int irq_nr;
};
extern struct gicv3_data gicv3_data;

#define gicv3_dist_base()		(gicv3_data.dist_base)
#define gicv3_redist_base()		(gicv3_data.redist_base[smp_processor_id()])
#define gicv3_sgi_base()		(gicv3_data.redist_base[smp_processor_id()] + SZ_64K)

extern int gicv3_init(void);
extern void gicv3_enable_defaults(void);
extern void gicv3_set_redist_base(size_t stride);

static inline void gicv3_do_wait_for_rwp(void *base)
{
	int count = 100000;	/* 1s */

	while (readl(base + GICD_CTLR) & GICD_CTLR_RWP) {
		if (!--count) {
			printf("GICv3: RWP timeout!\n");
			abort();
		}
		cpu_relax();
		udelay(10);
	};
}

static inline void gicv3_dist_wait_for_rwp(void)
{
	gicv3_do_wait_for_rwp(gicv3_dist_base());
}

static inline void gicv3_redist_wait_for_uwp(void)
{
	/*
	 * We can build on gic_do_wait_for_rwp, which uses GICD_ registers
	 * because GICD_CTLR == GICR_CTLR and GICD_CTLR_RWP == GICR_CTLR_UWP
	 */
	gicv3_do_wait_for_rwp(gicv3_redist_base());
}

static inline u32 mpidr_compress(u64 mpidr)
{
	u64 compressed = mpidr & MPIDR_HWID_BITMASK;

	compressed = (((compressed >> 32) & 0xff) << 24) | compressed;
	return compressed;
}

static inline u64 mpidr_uncompress(u32 compressed)
{
	u64 mpidr = ((u64)compressed >> 24) << 32;

	mpidr |= compressed & MPIDR_HWID_BITMASK;
	return mpidr;
}

#endif /* !__ASSEMBLY__ */
#endif /* _ASMARM_GIC_V3_H_ */