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drm/i915: Add REG_GENMASK64() and REG_FIELD_GET64()

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We treat SSKPD as a 64 bit register. Add the support macros
to define/extract bits in such registers.

v2: Fix 32bit builds

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220211182045.23555-1-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2022-02-11 20:20:45 +02:00
parent f12dc0d843
commit be78311eaa
1 changed files with 27 additions and 0 deletions
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27
drivers/gpu/drm/i915/i915_reg_defs.h
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@ -37,6 +37,21 @@
__is_constexpr(__low) && \
((__low) < 0 || (__high) > 31 || (__low) > (__high)))))
/**
* REG_GENMASK64() - Prepare a continuous u64 bitmask
* @__high: 0-based high bit
* @__low: 0-based low bit
*
* Local wrapper for GENMASK_ULL() to force u64, with compile time checks.
*
* @return: Continuous bitmask from @__high to @__low, inclusive.
*/
#define REG_GENMASK64(__high, __low) \
((u64)(GENMASK_ULL(__high, __low) + \
BUILD_BUG_ON_ZERO(__is_constexpr(__high) && \
__is_constexpr(__low) && \
((__low) < 0 || (__high) > 63 || (__low) > (__high)))))
/*
* Local integer constant expression version of is_power_of_2().
*/
@ -71,6 +86,18 @@
*/
#define REG_FIELD_GET(__mask, __val) ((u32)FIELD_GET(__mask, __val))
/**
* REG_FIELD_GET64() - Extract a u64 bitfield value
* @__mask: shifted mask defining the field's length and position
* @__val: value to extract the bitfield value from
*
* Local wrapper for FIELD_GET() to force u64 and for consistency with
* REG_GENMASK64().
*
* @return: Masked and shifted value of the field defined by @__mask in @__val.
*/
#define REG_FIELD_GET64(__mask, __val) ((u64)FIELD_GET(__mask, __val))
typedef struct {
u32 reg;
} i915_reg_t;