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Commit 87f0da55 authored by Dave Airlie's avatar Dave Airlie
Browse files

drm: add DRM_READ/WRITE64 wrappers around readq/writeq. 



The readq/writeq stuff is from Dave Miller, and he
warns users to be careful about using these. Plans are only
r600 to use it so far.

Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 8ced9c75

include/drm/drm_os_linux.h

+19 −0
Original line number Diff line number Diff line
@@ -6,6 +6,19 @@ 
#include <linux/interrupt.h>	/* For task queue support */

#include <linux/delay.h>



#ifndef readq

static u64 readq(void __iomem *reg)

{

	return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);

}



static void writeq(u64 val, void __iomem *reg)

{

	writel(val & 0xffffffff, reg);

	writel(val >> 32, reg + 0x4UL);

}

#endif



/** Current process ID */

#define DRM_CURRENTPID			task_pid_nr(current)

#define DRM_SUSER(p)			capable(CAP_SYS_ADMIN)
@@ -23,6 +36,12 @@ 
/** Write a dword into a MMIO region */

#define DRM_WRITE32(map, offset, val)	writel(val, ((void __iomem *)(map)->handle) + (offset))

/** Read memory barrier */



/** Read a qword from a MMIO region - be careful using these unless you really understand them */

#define DRM_READ64(map, offset)		readq(((void __iomem *)(map)->handle) + (offset))

/** Write a qword into a MMIO region */

#define DRM_WRITE64(map, offset, val)	writeq(val, ((void __iomem *)(map)->handle) + (offset))



#define DRM_READMEMORYBARRIER()		rmb()

/** Write memory barrier */

#define DRM_WRITEMEMORYBARRIER()	wmb()