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drm/radeon: document radeon_asic.c

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Adds documentation to most of the functions in
radeon_asic.c

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Alex Deucher 2012-07-17 14:02:36 -04:00 committed by Christian König
parent b73ba98dcb
commit abf1dc67cb
1 changed files with 46 additions and 0 deletions
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46
drivers/gpu/drm/radeon/radeon_asic.c
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@ -40,6 +40,16 @@
/*
* Registers accessors functions.
*/
/**
* radeon_invalid_rreg - dummy reg read function
*
* @rdev: radeon device pointer
* @reg: offset of register
*
* Dummy register read function. Used for register blocks
* that certain asics don't have (all asics).
* Returns the value in the register.
*/
static uint32_t radeon_invalid_rreg(struct radeon_device *rdev, uint32_t reg)
{
DRM_ERROR("Invalid callback to read register 0x%04X\n", reg);
@ -47,6 +57,16 @@ static uint32_t radeon_invalid_rreg(struct radeon_device *rdev, uint32_t reg)
return 0;
}
/**
* radeon_invalid_wreg - dummy reg write function
*
* @rdev: radeon device pointer
* @reg: offset of register
* @v: value to write to the register
*
* Dummy register read function. Used for register blocks
* that certain asics don't have (all asics).
*/
static void radeon_invalid_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v)
{
DRM_ERROR("Invalid callback to write register 0x%04X with 0x%08X\n",
@ -54,6 +74,14 @@ static void radeon_invalid_wreg(struct radeon_device *rdev, uint32_t reg, uint32
BUG_ON(1);
}
/**
* radeon_register_accessor_init - sets up the register accessor callbacks
*
* @rdev: radeon device pointer
*
* Sets up the register accessor callbacks for various register
* apertures. Not all asics have all apertures (all asics).
*/
static void radeon_register_accessor_init(struct radeon_device *rdev)
{
rdev->mc_rreg = &radeon_invalid_rreg;
@ -102,6 +130,14 @@ static void radeon_register_accessor_init(struct radeon_device *rdev)
/* helper to disable agp */
/**
* radeon_agp_disable - AGP disable helper function
*
* @rdev: radeon device pointer
*
* Removes AGP flags and changes the gart callbacks on AGP
* cards when using the internal gart rather than AGP (all asics).
*/
void radeon_agp_disable(struct radeon_device *rdev)
{
rdev->flags &= ~RADEON_IS_AGP;
@ -1608,6 +1644,16 @@ static struct radeon_asic si_asic = {
},
};
/**
* radeon_asic_init - register asic specific callbacks
*
* @rdev: radeon device pointer
*
* Registers the appropriate asic specific callbacks for each
* chip family. Also sets other asics specific info like the number
* of crtcs and the register aperture accessors (all asics).
* Returns 0 for success.
*/
int radeon_asic_init(struct radeon_device *rdev)
{
radeon_register_accessor_init(rdev);