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radeon: add comment to clarify bus mastering on PCIE chips

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Alex Deucher 2008-10-06 12:12:49 -04:00
parent 6f9dfa098f
commit 728d8e226f
1 changed files with 14 additions and 4 deletions
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18
shared-core/radeon_drv.h
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@ -432,20 +432,30 @@ extern int r300_do_cp_cmdbuf(struct drm_device *dev,
# define RADEON_SCISSOR_1_ENABLE (1 << 29)
# define RADEON_SCISSOR_2_ENABLE (1 << 30)
/*
* PCIE radeons (rv370/rv380, rv410, r423/r430/r480, r5xx)
* don't have an explicit bus mastering disable bit. It's handled
* by the PCI D-states. PMI_BM_DIS disables D-state bus master
* handling, not bus mastering itself.
*/
#define RADEON_BUS_CNTL 0x0030
/* r1xx, r2xx, r300, r(v)350, r420, rs480 */
/* r1xx, r2xx, r300, r(v)350, r420/r481, rs480 */
# define RADEON_BUS_MASTER_DIS (1 << 6)
/* rs400, rs690, rs740 */
/* rs400, rs690/rs740 */
# define RS400_BUS_MASTER_DIS (1 << 14)
# define RS400_MSI_REARM (1 << 20)
/* see RS480_MSI_REARM in AIC_CNTL for rs480 */
#define RADEON_BUS_CNTL1 0x0034
# define RADEON_PMI_BM_DIS (1 << 2)
# define RADEON_PMI_INT_DIS (1 << 3)
#define RV370_BUS_CNTL 0x004c
/* rv370, rv380, rv410, r423, r430, r480, r5xx */
# define RV370_PMI_BM_DIS (1 << 5)
# define RV370_PMI_INT_DIS (1 << 6)
#define RADEON_MSI_REARM_EN 0x0160
/* rv370, rv380, rv410, r423, r430, r480, r5xx */
/* rv370/rv380, rv410, r423/r430/r480, r5xx */
# define RV370_MSI_REARM_EN (1 << 0)
#define RADEON_CLOCK_CNTL_DATA 0x000c