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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2022 Intel Corporation
*/
#ifndef __I915_REG_DEFS__
#define __I915_REG_DEFS__
#include <linux/bitfield.h>
#include <linux/bits.h>
/**
* REG_BIT() - Prepare a u32 bit value
* @__n: 0-based bit number
*
* Local wrapper for BIT() to force u32, with compile time checks.
*
* @return: Value with bit @__n set.
*/
#define REG_BIT(__n) \
((u32)(BIT(__n) + \
BUILD_BUG_ON_ZERO(__is_constexpr(__n) && \
((__n) < 0 || (__n) > 31))))
/**
* REG_GENMASK() - Prepare a continuous u32 bitmask
* @__high: 0-based high bit
* @__low: 0-based low bit
*
* Local wrapper for GENMASK() to force u32, with compile time checks.
*
* @return: Continuous bitmask from @__high to @__low, inclusive.
*/
#define REG_GENMASK(__high, __low) \
((u32)(GENMASK(__high, __low) + \
BUILD_BUG_ON_ZERO(__is_constexpr(__high) && \
__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().
*/
#define IS_POWER_OF_2(__x) ((__x) && (((__x) & ((__x) - 1)) == 0))
/**
* REG_FIELD_PREP() - Prepare a u32 bitfield value
* @__mask: shifted mask defining the field's length and position
* @__val: value to put in the field
*
* Local copy of FIELD_PREP() to generate an integer constant expression, force
* u32 and for consistency with REG_FIELD_GET(), REG_BIT() and REG_GENMASK().
*
* @return: @__val masked and shifted into the field defined by @__mask.
*/
#define REG_FIELD_PREP(__mask, __val) \
((u32)((((typeof(__mask))(__val) << __bf_shf(__mask)) & (__mask)) + \
BUILD_BUG_ON_ZERO(!__is_constexpr(__mask)) + \
BUILD_BUG_ON_ZERO((__mask) == 0 || (__mask) > U32_MAX) + \
BUILD_BUG_ON_ZERO(!IS_POWER_OF_2((__mask) + (1ULL << __bf_shf(__mask)))) + \
BUILD_BUG_ON_ZERO(__builtin_choose_expr(__is_constexpr(__val), (~((__mask) >> __bf_shf(__mask)) & (__val)), 0))))
/**
* REG_FIELD_GET() - Extract a u32 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 u32 and for consistency with
* REG_FIELD_PREP(), REG_BIT() and REG_GENMASK().
*
* @return: Masked and shifted value of the field defined by @__mask in @__val.
*/
#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;
#define _MMIO(r) ((const i915_reg_t){ .reg = (r) })
#define INVALID_MMIO_REG _MMIO(0)
static __always_inline u32 i915_mmio_reg_offset(i915_reg_t reg)
{
return reg.reg;
}
static inline bool i915_mmio_reg_equal(i915_reg_t a, i915_reg_t b)
{
return i915_mmio_reg_offset(a) == i915_mmio_reg_offset(b);
}
static inline bool i915_mmio_reg_valid(i915_reg_t reg)
{
return !i915_mmio_reg_equal(reg, INVALID_MMIO_REG);
}
#define VLV_DISPLAY_BASE 0x180000
#endif /* __I915_REG_DEFS__ */
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